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Claims  |
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What is claimed is:
1. An electronic digital scale comprising:
a housing;
an extensible member adapted to be pulled in and out of the housing to fit
an object to be measured;
a spring loaded reel means for accommodating and storing the extensible
member therein and rotating in response to the extension of said member
with respect to said housing;
a detector means directly coupled to the spring loaded reel means for
detecting the rotations of the spring loaded reel means and providing
output signals in response to said rotation representative of the extended
length of said extensible member;
memory means having a plurality of addresses for receiving said output
signals from the detector and storing the said output signals therein;
a display means for receiving stored output signals from said memory means
and said output signals from said detector means;
a memory key means for causing the said output signals from said detector
means to be stored in said memory means in a selected address;
a memory recall key means for transferring the said stored detector output
signals from said memory means to said display means;
a memory clear key means for cancelling the said stored output signals from
said memory means; and
memory control means interconnected with said memory means and said memory
key and memory recall key means responsive to a predetermined number of
sequential actuations of said memory key means and said memory recall key
means to store and display information, respectively, at and from a
selected memory address.
2. The electronic digital scale as recited in claim 1, wherein said memory
key means comprises a memory key for directing an output signal from said
detector means to be stored in a preselected one of the memory addresses
of said memory means; and a free key for allocating said preselected one
of the memory addresses of said memory means for said memory key through
said memory control means to permit said memory key to direct the storage
of a said detector output signal.
3. The electronic digital scale as recited in claim 1, wherein said memory
control means comprises an N-nary counter, a decoder having a plurality of
outputs driven by said counter to enable a selected one of its said
outputs and a plurality of memory address gate means corresponding one to
each decoder output and driven thereby;
said N-nary counter being responsive to said free key and said recall key
means in conjunction with said decoder outputs for selecting a particular
one of said memory addresses and controlling the entry of detector output
signals therein.
4. The electronic digital scale as recited in claim 3, wherein said memory
address gate means comprise a series of AND gates each said AND gate
receiving and responsive to, in conjunction, an output from said decoder,
actuation of said memory key, and said output signals from said detector
means.
5. The electronic digital scale as recited in claim 3, wherein said scale
further includes memory output gate means for outputting a stored signal
from a selected memory address, comprising:
a second series of AND gates corresponding one to each memory address
responsive, in conjunction, to the stored signal in a corresponding said
memory address, said output signals from said decoder means, and the
actuation of said memory recall key.
6. The electronic digital scale as recited in claim 5, wherein said memory
output gate means further comprises an OR gate driven by said second
series of AND gates and includes an output driving said decoder means to
transfer said stored signal in a memory address selected by said memory
recall key means to said detector means; and
wherein said detector means further includes an up/down counter means for
receiving said selected stored signal from said OR gate and directing same
through said detector means to said display means.
7. The electronic digital scale as recited in claim 2, which further
includes a flip-flop responsive to the respective actuations of said free
key and said memory key to provide SET and RESET outputs, respectively;
a transistor responsive to become conductive and non-conductive,
respectively, by the presence of said SET and RESET outputs of said
flip-flop; and
an illumination lamp illuminated by said transistor in response to said SET
output for visually indicating that one of the said memory addresses is
appropriately allocated to receive an output signal of said detector means
upon actuation of said memory key, said actuation of said memory key
serving to extinguish said lamp to indicate completion of such storage.
8. The electronic digital scale as recited in claim 7, wherein said memory
control means comprises an N-nary counter, a decoder having a plurality of
outputs driven by said counter to enable a selected one of its said
outputs and a plurality of memory address gate means corresponding one to
each decoder output and driven thereby;
said N-nary counter being responsive to said free key and said recall by
means in conjunction with said decoder outputs for selecting a particular
one of said memory addresses and controlling the entry of detector output
signals therein.
9. The electronic digital scale as recited in claim 7, wherein said memory
address gate means comprise a series of AND gates each said AND gate
receiving and responsive to, in conjunction, an output from said decoder,
actuation of said memory key, and said output signals from said detector
means.
10. The electronic digital scale as recited in claim 7, wherein said scale
further includes memory output gate means for outputting a stored signal
from a selected memory address, comprising:
a second series of AND gates corresponding one to each memory address
responsive, in conjunction, to the stored signal in a corresponding said
memory address, said output signals from said decoder means, and the
actuation of said memory recall key.
11. The electronic digital scale as recited in claim 7, wherein said memory
output gate means further comprises an OR gate driven by said second
series of AND gates and includes an output driving said decoder means to
transfer said stored signal in a memory address selected by said memory
recall key means to said detector means; and
wherein said detector means further includes an up/down counter means for
receiving said selected stored signal from said OR gate and directing same
through said detector means to said display means.
12. An electronic digital scale comprising:
a housing;
an extensible member adapted to be pulled in and out of the housing to fit
an object to be measured;
a spring loaded reel means for accommodating and storing the extensible
member therein and rotating in response to the extension of said member
with respect to said housing;
a detector means directly coupled to the spring loaded reel means for
detecting the rotations of the spring loaded reel and providing output
signals in response to said rotation representative of the extended length
of said extensible member;
memory means for receiving said output signals from the detector and
storing the said output signals therein;
a display means for receiving stored output signals from said memory means;
a memory key means for causing the said output signals from said detector
means to be stored in said memory means;
a memory recall key means for transferring the said stored detector output
signals from said memory means to said display means; and
a memory clear key means for cancelling the said stored output signals from
said memory means.
13. The electronic digital scale of claim 12, wherein said memory means
comprises a plurality of independent memory locations; and
wherein said digital scale further includes logic means responsive to a
predetermined number of sequential actuations of said memory key means and
said memory recall key means for preselecting a said memory location
corresponding to said number of actuations for receiving an output signal
from said detector, transferring said output signal from said detector to
said preselected location subsequent to the preselection thereof and
displaying said stored signal from a said preselected location.
14. The electronic digital scale of claim 13, wherein said memory key means
comprises a memory key for directing an output signal from said detector
means to be stored in a preselected one of said independent memory
locations and a free key for preselecting the said one of said independent
memory locations through said logic means to thereafter permit said memory
key to direct such storage therein.
15. The electronic digital scale as recited in claim 14, wherein said logic
means comprises an N-nary counter, a decoder having a plurality of outputs
driven by said counter to enable a selected one of its said outputs and a
plurality of memory location gate means corresponding one to each decoder
output and driven thereby;
said N-nary counter being responsive to said free key and said recall key
means in conjunction with said decoder outputs for selecting a particular
one of said memory locations and controlling the entry of detector output
signals therein.
16. The electronic digital scale as recited in claim 15, wherein said
memory location gate means comprises a series of AND gates, each said AND
gate receiving and responsive to, in conjunction, an output from said
decoder, actuation of said memory key, and said output signals from said
detector means.
17. The electronic digital scale as recited in claim 15, wherein said scale
further includes memory output gate means for outputting a stored signal
from a selected independent memory location, comprising:
a second series of AND gates corresponding one to each said independent
memory location responsive, in conjunction, to the stored signal in a
corresponding said memory location, said output signals from said decoder
means and the actuation of said memory recall key.
18. The electronic digital scale as recited in claim 17, wherein said
memory output gate means further comprises an OR gate driven by said
second series of AND gates and includes an output driving said decoder
means to transfer said stored signal in a said independent memory location
selected by said memory recall key means to said detector means; and
wherein said detector means further includes an up/down counter means for
receiving said selected stored signal from said OR gate and directing same
through said detector means to said display means.
19. The electronic digital scale as recited in claim 14, which further
includes a flip-flop responsive to the respective actuations of said free
key and said memory key to provide SET and RESET outputs, respectively;
a transistor responsive to become conductive and non-conductive,
respectively, by the presence of said SET and RESET outputs of said
flip-flop; and
an illumination lamp illuminated by said transistor in response to said SET
output for visually indicating that one of the said independent memory
locations is appropriately allocated to receive an output signal of said
detector means from actuation of said memory key, said actuation of said
memory key serving to extinguish said lamp to indicate completion of such
storage.
20. In an electronic digital scale having a housing and an extensible
member mounted on a reel means within said housing and being extensible
and retractible between one or a plurality of measurement positions, and
means for providing a resultant measurement as a function of said
measurement positions comprising:
sensing means driven by said reel means for providing up and down signal
pulses in response to extensions and retractions, respectively, of said
extensible member with respect to said housing;
key input means for selecting a desired resultant measurement;
processor means responsive to key input means for controlling the
determination of said resultant measurement;
up/down counter means responsive to said sensing means and said key input
means for providing input parameters to said processor means required for
said determination of said resultant measurement; and
display means driven by said processor means for displaying said resultant
measurement;
said sensing means comprising:
sensor means providing first signals representative of extensions and
retractions of said extensible member;
amplifier means driven by said first signals to provide amplified second
signals corresponding to said first signals;
comparator means for shaping said second signals to provide third signals
representative of the magnitude of displacement of said extensible member
between successive positions; and
up/down judge circuit means driven by said third signals and responsive to
the sense of said displacement of said extensible member to provide said
up and down signal pulses.
21. In an electronic digital scale having a housing and an extensible
member mounted on a reel means within said housing and being extensible
and retractible between one or a plurality of measurement positions, and
means for providing a resultant measurement as a function of said
measurement positions comprising:
sensing means driven by said reel means for providing up and down signal
pulses in response to extensions and retractions, respectively, of said
extensible member with respect to said housing;
key input means for selecting a desired resultant measurement;
processor means responsive to key input means for controlling the
determination of said resultant measurement;
up/down counter means responsive to said sensing means and said key input
means for providing input parameters to said processor means required for
said determination of said resultant measurement; and
display means driven by said processor means for displaying said resultant
measurement;
said processor means comprising:
central processing means for coordinating the operation of said processor
and said display means;
a memory means for storing measurement position data and resultant
measurement data therein; and
an adder/subtractor means controlled by said central processing means and
responsive to said measurement position data stored in said memory means
for determining said resultant measurement;
said resultant measurement data from said memory means being displayed on
said display means in response to said central processing means.
22. An electronic digital scale in accordance with claim 21 wherein said
key input means comprises:
a clear key means for clearing the contents of said up/down counter means;
a memory key means for introducing said measurement position data into said
memory means;
a memory recall key means for transferring said measurement position data
from said memory means to said display means;
a memory clear key means for clearing the contents of said memory means
thereby erasing the contents of said display means; and
a function key means for directing said adder/subtractor means to determine
said resultant measurement.
23. An electronic digital scale in accordance with claim 22 wherein said
processor means further comprises:
a memory driver means responsive to said key input means and an output from
said memory means for transmitting said measurement position data from
said memory means to said central processing means for subsequent display
by said display means.
24. An electronic digital scale in accordance with claim 21, wherein said
sensing means comprises:
sensor means providing first signals representative of extensions and
retractions of said extensible member;
amplifier means driven by said first signals to provide amplified second
signals corresponding to said first signals;
comparator means for shaping said second signals to provide third signals
representative of the magnitude of displacement of said extensible member
between successive positions; and
up/down judge circuit means driven by said third signals and responsive to
the sense of said displacement of said extensible member to provide said
up and down signal pulses.
25. An electronic digital scale in accordance with claim 24, wherein said
key input means comprises:
a clear key means for clearing the contents of said up/down counter means;
a memory key means for introducing said measurement position data into said
memory means;
a memory recall key means for transferring said measurement position data
from said memory means to said display means;
a memory clear key means for clearing the contents of said memory means
thereby erasing the contents of said display means; and
a function key means for directing said adder/subtractor means to determine
said resultant measurement.
26. An electronic digital scale in accordance with claim 24, wherein said
processor means further comprises:
a memory driver means responsive to said key input means and an output from
said memory means for transmitting said measurement position data from
said memory means to said central processing means for subsequent display
by said display means. |
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Claims |
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Description |
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BACKGROUND OF THE INVENTION
The present invention relates to a combined electronic digital scale and
calculator and, more particularly, to a combined electronic digital scale
and calculator which is adapted to transfer stored information to a memory
for further treatment thereof.
A prior art measurement instrument was disclosed in Taylor U.S. Pat. No.
3,780,440 "MEASUREMENT INSTRUMENT" issued on Dec. 25, 1973. The
measurement instrument did not have a memory which stores distance
information derived from the results of measurements through the use of an
extensible tape member which can be fitted to an object to be measured.
Furthermore, a key input means was not provided for functioning to direct
the measurement instrument how to manipulate the stored information and
the following information introduced through the extensible member.
Therefore, a combined electronic digital scale and calculator is most
desirable, which includes the above key input means for ensuring further
variations of functions thereof.
OBJECTS AND SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a novel
combined electronic digital scale and calculator which simplifies
measuring procedures to measure the length of an object considerable
length.
Another object of the present invention is to provide a novel combined
electronic digital scale and calculator which manipulates distance
information introduced through the use of a key input means.
Still another object of the present invention is to provide a novel
combined electronic digital scale and calculator having a plurality of
memories which can subsequently store information responsive to respective
measurement trials in response to a key input means.
Yet another object of the present invention is to provide a novel combined
electronic digital scale and calculator which can place the original point
of an extensible member in a spontaneous position thereof which is
voluntarily extendable out of the housing of the combined electronic
digital scale and calculator, the extensible member being fitted to an
object when the length of the object is measured. Other objects and
further scope of applicability of the present invention will become
apparent from the detailed description given hereinafter. It should be
understood, however, that the detailed description and specific examples,
while indicating preferred embodiments of the invention, are given by way
of illustration only, since various changes and modifications within the
spirit and scope of the invention will become apparent to those skilled in
the art from this detailed description.
To achieve the above objects, pursuant to an embodiment of the present
invention, key input means are provided for demanding a combined
electronic digital scale and calculator how to manipulate information
introduced thereto. The key input means comprises a clear key, a memory
key, a memory recall key, a free key, and a function key. The clear key is
used for effecting a clear operation of the stored information in an
up/down counter responsive to up and down information obtained from a
photo detector disposed with respect to an extensible member. The memory
key is activated for permitting the thus introduced information to be
stored in a respective memory. The memory recall key is operated for
transferring the stored information to a display to provide a visual
indication thereon. The free key functions to allocate a specific memory
to store the introduced information. The function key is activated for
determining whether an adder/subtractor is to perform addition or
subtraction. The combined electronic digital scale and calculator also
functions as the well-known electronic calculator which calculates the
introduced numeral information responsive to the actuation of any digit
key or keys through the activation of a command key for directing the
electronic calculator how to manipulate the information. The detail of the
calculator is disclosed in U.S. Pat. No. 3,892,957 entitled "DIGIT MASK
LOGIC COMBINED WITH SEQUENTIALLY ADDRESSED-MEMORY IN ELECTRONIC CALCULATOR
CHIP", issued on July 1, 1975 and assigned to Texas Instruments Inc, etc.
In a preferred form, a plurality of memory means are provided for
respectively storing the introduced information in response to the
actuation of the memory key for introduction of the subsequent measurement
information. The introduced information is visually indicated by the
display in accordance with the actuation of the memory recall key. The
information is transferred to the memory selected by the free key for
storage thereof. An illumination lamp is provided for indicating that the
information is correctly stored in the selected memory.
In another preferred form, a CPU is provided for controlling the
information stored in the up/down counter, the memory, the display, and
the adder/subtractor in response to the actuation of the key input means.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed
description given hereinbelow and the accompanying drawings which are
given by way of illustration only, and thus are not limitative of the
present invention and wherein,
FIG. 1 is a perspective view of a combined electronic digital scale and
calculator of an embodiment of the present invention;
FIGS. 2(A) and 2(B) are block diagrams of a processor circuit included
within the combined electronic digital scale and calculator shown in FIG.
1, respectively;
FIG. 3 is a time chart showing various signals occurring within the
processor circuit; and
FIG. 4 is a block diagram of a processor circuit included within a combined
electronic digital scale and calculator of another embodiment of the
present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a combined electronic digital scale and calculator 10 of the
present invention which includes an extensible tape member 12, a key board
14, an illumination lamp 15 and a display 16. The extensible tape member
12 can be pulled out of the housing of the combined electronic digital
scale and calculator 10 to measure the length of an object by attachment
to the object.
The length of the object is determined by the amount of the extended length
of the extensible tape member 12 out of the housing of the combined
electronic digital scale and calculator 10. The extensible tape member 12
is constantly being forced into the housing by a spring means loaded in a
reel (not shown) which accommodates and stores the tape member 12.
The keyboard 14 comprises a plurality of numeral keys 18, function keys 20,
a free key 22, a clear key 24, a memory recall key 26, and a memory key
28. The numeral keys 18 function to introduce numeral information into the
combined electronic digital scale and calculator 10 in response to
actuation thereof. The function keys 20 are used for commanding the
combined electronic digital scale and calculator 10 to process the
introduced numeral information. The free key 22 functions to select the
memory which will store distance information entered by the extensible
tape member 12. The clear key 24 is activated for functioning clear
operation of the stored information such as the numeral information and
the distance information. The memory recall key 26 is used for
transferring the information stored in the memory to the display 16 to
provide the visual indication responsive to the information therein. The
memory key 28 is operated for storing the information such as the numeral
information and the distance information to a memory selected by the free
key 22.
The illumination lamp 15 is excited to indicate the distance information as
to the extensible tape member 12 to be stored in the selected memory. The
display 16 shows the numeral information and the distance information,
which, for example comprises a liquid crystal display.
FIGS. 2(A) and 2(B) illustrates the circuit configuration employed within
the combined electronic digital scale and calculator 10, wherein the
distance information as to the extensible tape member 12 is subsequently
memorized as described hereinbelow.
The circuit configuration shown in FIG. 2(A) comprises a sensor 30, an
amplifier 32, an up/down counter 34, a control circuit 36, the display 16,
an N-nary counter 38, a decoder 40, a plurality of memories 42, 44, 46 and
48, AND gates A1 through An and B1 through Bn, and an OR gate 01. The
circuit configuration described in FIG. 2(B) comprises a flip-flop F1, a
transistor Tr, and the illumination lamp 15.
The sensor 30 detects the travel of the extensible tape member 12 in
determining the measured length, which includes a couple of light emitting
elements and a light receiving element and provides signals corresponding
to the travel distance of the extensible tape member 12. The amplifier 32
amplifies the signals up to a predetermined level sufficient for
subsequent treatment within the circut configuration, which includes a
signal shaper.
The up/down counter 34 is responsible for an increase or decrease in the
length of the extensible tape member 12 to increment or decrement the
corresponding counter. The control circuit 36 is adapted to adjust the
outputs of the up/down counter 34 to become available for the display 16.
The N-nary counter 38 counts up by one in response to a signal CT'
developed through the actuation of either the memory recall key 26 or the
free key 22. The decoder 40 provides control signals applied to the AND
gates A1 through An in accordance with the output generated from the
N-nary counter 38. The AND gates A1 through An receive input signals from
the memory key 28 and the output from the decoder 40 and the control
circuit 36 to turn on and transfer the input information thereof,
respectively.
A series of the memories 42, 44, 46 and 48 are provided for storing the
distance information derived from the AND gates A1 through An,
respectively. The AND gates B1 through Bn receive the outputs of both the
memories 42, 44, 46 and 48 and the decoder 40 and the input signals
derived from the memory recall key 26. The output of the memories 42, 44,
46 and 48 are introduced into the OR gate 0.sub.1 to conduct the OR gate
0.sub.1 and provides the output thereof to the up/down counter 34.
The flip-flop F1 receives an input signal via the free key 22 as the set
signal thereof and an input signal via the memory key 28 as the reset
signal thereof and provides the output thereof for the transistor Tr
through a resistor R1.
The transistor Tr controls the illumination lamp 15 to indicate appropriate
storage location of the distance information in the selected memory among
the memories 42, 44, 46 and 48.
Memory operations are as follows:
The distance information is provided from the sensor 32 by determining the
traveled movement of the extensible tape member 12 via a couple of the
light emitting element and the light receiving element. The distance
information is introduced into the up/down counter 34 after amplifying and
shaping by the amplifier 32. The up/down counter 34 adds and reduces its
counts in accordance with count-up signals of the distance information
responsive to pull-out movement of the extensible tape member 12 and
count-down signals of the distance information responsive to drawn-in
movement thereof. The distance information is indicated in the display 16
under control of the control circuit 36.
The introduced distance information is memorized as described hereinbelow.
The free key 22 is activated for advancing the N-nary counter 38 by one
count through the input signal CT'. The outputs from the N-nary counter 38
are entered into the decoder 40 to control the decoder 40 which in turn
transmits the outputs of the N-nary counter 38 to provide signals
corresponding to the output, the signals being applied to a selected AND
gate, for example, A1 among the AND gates A1 through An.
The AND gates A1 through An further receive the distance information
developed at the control circuit 36. Under these conditions, the memory
key 28 is energized for conducting the AND gate A1 selected by the N-nary
counter 38 to thereby store the distance information in the memory 42. Now
further measurements are available.
The free key 22 is subsequently activated for further measurement, wherein
the N-nary counter 38 is advanced in response to the signal CT' to thereby
control the decoder 40 and the display 16. The display 16 ceases the
indication corresponding to the previous distance information. The
subsequent measurement is achieved by the extensible tape member 12 as
described above. The subsequent distance information is similarly entered
into the control circuit 38 through the sensor 30, the amplifier 32, and
the up/down counter 34 to provide the indication corresponding thereto in
the display 16.
The decoder 40 selects a specific AND gate except for the AND gate A1, for
example, A2 through the conversion of the value of the counter contained
in the N-nary counter 38. Under these circumstances, the subsequent
distance information is introduced into the memory 44 through the
actuation of the memory key 28, the subsequent distance information being
stored in the control circuit 36. Similarly, the remaining memories 46 and
48 can store the further subsequent distance information through the
subsequent actuation of the free key 22 and the memory key 28,
respectively.
The flip-flop F1 is set by the activation of the free key 22 to thereby
enable the illumination lamp 15 through the transistor Tr. The memory key
28 resets the flip-flop F1 to disable illumination lamp 15, whereby it is
indicated that the distance information is stored in a memory selected
among the memories 42, 44, 46 and 48.
When the distance information stored in the memories 42 through 48 is to be
visually indicated in the display 16, the memory recall key 26 is
activated for advancing the N-nary counter 38 by one count. The memory
recall key 26 should be activated the number of times which corresponds to
the number of activations of the memory key 28 in storing the respective
distance information. The encoder 40 is controlled by the N-nary counter
38 to provide outputs applied to the AND gates B1 through Bn. The AND
gates further receive the outputs from the memories 42, 44, 46 and 48 and
the memory recall key 26 to conduct the OR gate 01. The outputs of the OR
gate 01 are introduced into the up/down ocunter 34 for displaying in the
display 16 through the control circuit 36. The display 16 is
simultaneously controlled by the N-nary counter 38 to indicate which
memorized distance information is now displayed therein. That is, the
order of the memorized distance information which is stored in the N-nary
counter 38 is indicated in the display 16 by enabling one of the remaining
digits except for showing the distance information.
FIG. 3 shows a time chart of wave forms CT' and MR' responsive to the
memory recall key 26, MR' representing the actuation of the memory recall
key 26 at a high level. The CT' signal is developed in response to the
initiation of the memory recall key 26 to add the counter contained in the
N-nary counter 38. On the other hand, the MR' signal is generated after
the elimination of the CT' signal to transfer the distance information
contained in the memories 42 through 48 in response to the actuation of
the memory recall key 26. The CT' signal is further developed in response
to the actuation of the free key 22.
FIG. 4 illustrates another circuit configuration of another embodiment of
the present invention, which mainly comprises a couple of sensors 30A and
30B, amplifiers 32A and 32B, comparators 50A and 50B, an up/down judge
circuit 52, the up/down counter 34, a CPU 54, a memory 56, a memory driver
58, an adder/subtractor 60, and the display 16. Like numerals to those of
FIGS. 1 and 2(A) represent like elements.
The sensors 30A and 30B respectively comprise a couple of light emitting
elements and light receiving elements as in the sensor 30. The sensors 30A
and 30B develop signals which have a 90.degree. phase difference from each
other to determine either increase or decrease of the length of the
extensible tape member 12. The respective signal is amplified by the
amplifiers 32A and 32B. The comparators 50A and 50B comprising Schmidt
circuits shape the outputs of the amplifiers 32A and 32B. The up/down
judge circuit 52 determines whether the outputs from the comparators 50A
and 50B are either count-up information corresponding to the increase of
the extending length of the extensible tape member 12 or count-down
information corresponding to the decrease of the extending length thereof.
Count-up and count-down signals are developed from the up/down judge
circuit 52 and then applied to the up/down counter 34 to count themselves.
The count-up/count-down information is introduced into the CPU 54 for
processing purposes. The display 16 indicates the distance information in
accordance with control of the CPU 54. The sensors 30A and 30B develop the
signals of which units are converted from units of the length of the
extensible tape member 12 in to predetermined pulses. The CPU 54
demodulates the conversion rate of the unit of the extending length i.e.
the pulses.
The key board 14 comprises the clear key 24, the memory key 28, the memory
recall key 26, the function keys 20, and a memory clear key 62. The clear
key 24 is activated for resetting the distance information stored in the
up/down counter 34 to there by extinguish the indication shown in the
display 16. Therefore, the distance information corresponding to the
extended length of the extensible tape member 12 is canceled without
complete pull-in movement of the extensible tape member 12 into the
housing of the combined electronic digital scale and calculator 10. With
such an arrangement, further measurement of the length of the object is
available through the further travel of the extensible tape member 12.
That is, the extended length of the extensible tape member 12 is
identified as the original point for the further travel thereof.
The memory key 28 is operated for storing the distance information
contained in the up/down counter 34. Input signals from the memory key 28
are introduced into an one-shot mono-multivibrator 64. A memory signal is
developed from the one-shot mono-multivibtator 64 for conducting an AND
gate C1 to transfer the distance information contained in the up/down
counter 34 to the memory 56 through the CPU 54.
The memory recall key 26 functions to transfer the distance information
from the memory 56 to the display 16. An input signal from the memory
recall key 26 sets a flip-flop 66 to conduct an AND gate C2, the flip-flop
66 and the AND gate C2 being included within the memory driver 58, whereby
the distance information in the memory 56 is transmitted to the CPU 54 and
the display 16 for displaying purposes.
The distance information is canceled by the actuation of the memory clear
key 62 which resets the flip-flop 66 and controls the memory 56. The above
memory function for the distance information permits the further
measurement of the length of the object to be available.
The function keys 20 are provided for instructing the adder/subtractor 60
to manipulate the distance information in the memory 56 and the subsequent
distance information in the up/down counter 34. The distance information
in the memory 56 is directly introduced into the adder/subtractor 60 and
the subsequent distance information is entered into the adder/subtractor
60 through the CPU 54. The function keys 20 comprises an addition command
key and a subtraction command key. The results of calculations by the
adder/subtractor 60 are transferred to the CPU 54 and then the display for
displaying purposes.
It will be apparently noted that the present invention is equally
applicable to a digital scale only, although the above description has
been made about the combined digital scale and calculator 10.
The invention being thus described, it will be obvious that the same many
be varied in may ways. Such variations are not to be regarded as a
departure from the spirit and scope of the invention, and all such
modifications are intended to be included within the scope of the
following claims.
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