A sheet feeding apparatus for use in an image forming system includes a pivoting tray and a pivoting separating member which press against a feed roller. The movement of the tray and separating member is controlled by a cam having a first cam surface which controls the movement of the tray and a second cam surface which controls the movement of the separating member towards and away from a feed roller. The cam includes a gear having a segment without gear teeth. A spring pushes a third cam surfa...

A large scale key-telephone system or telephone exchange system having approximately eighty extension channels and a push-button dial system has been disclosed. A common unit in the system is a DTMF oscillator, which is installed in each telephone set, according to a prior art. The present system is completely compatible with thus prior key-telephone system or exchange system.

The data processing device of the present invention comprises a print job generating unit 22 for generating a print job in PDL format (PDL job) and a print job in BMI (bitmap image) format (BMI job) for one data file to perform stock printing, a storage device 12 for storing both print jobs, and a means for sending to a printer 15 or 16 the stored print job in response to an instruction from a user.

A digital phase shifter for phase-shifting a cyclic input signal includes first--third dividers 1, 4 and 8, first and second phase detectors 2 and 6, first and second voltage controlled oscillators (VCOs) 3 and 7, and a digital comparator 5. The input signal F(IN) and a clock signal F(VCO3) output from the first VCO3 are divided by N and M at the first and second dividers, respectively and phases of the divided signals are compared at the first phase detector 2, whereby the leading edges of the ...

The developing device of the present invention has developer containers detachably to house developers to be supplied by hollow holding members, supports plural developing units to supply different color developers to an image carrier and plural developing units in the replaceable state, and a revolver to move a desired developing unit to a point opposite to the image carrier by rotating plural developing units en block, and openings of the holding members for inserting the developer containers ...

An alloy type thermal fuse is provided in which a Bi--Sn alloy is used as a fuse element, which has an operating temperature of about 140.degree. C., which, even when used at a high power, can safely operate, and in which dispersion of the operating temperature can be sufficiently reduced. Also a material for a thermal fuse element is provided.An alloy composition in which Bi is larger than 50% and 56% or smaller, and a balance is Sn is used as a fuse element of the alloy type thermal fuse.

The invention provides a thermal fuse and a fuse element of the low-melting fusible alloy type in which the fuse element has an alloy composition of 37 to 43% In, 10 to 18% Sn, and the balance Bi. As a result, the operating temperature is in the range of 65 to 75.degree. C., requests for environment conservation can be satisfied, the diameter of the fuse element can be made very thin or reduced to about 300 .mu.m.phi., self-heating can be suppressed, and the thermal stability can be satisfactori...

A developing apparatus comprises a toner supply auger provided slidably along a shaft in a development case for transferring toner supplied from a toner supply inlet along the shaft to a transfer mixer, an open-and-shut device for opening and closing a toner supply outlet and a toner supply inlet, and a pushing means for moving the toner supply auger in the loading and unloading direction of the toner supply cartridge, thereby changing a site of the toner supply auger facing the toner supply inl...

According to a toner cartridge of this invention, a region (R3) extending along the outer circumferential direction of a toner cartridge (50) is not tapered, and a region (R1) on the inner wall of a developing device (10) which corresponds to the region (R3) is not tapered either. This prevents the occurrence of backlash between them, and allows the shutter of the toner replenishment port of the developing device (10) to be reliably closed when the toner cartridge (50) is slid. This can therefor...

The invention provides a thermal fuse and a fuse element of the low-melting fusible alloy type. The fuse element has an alloy composition in which a total of 0.01 to 7 weight parts of at least one selected from the group consisting of Au, Bi, Cu, Ni, and Pd is added to 100 weight parts of a composition of 100% In, that of 90 to 99.9% In and 0.1 to 10% Ag, or that of 95 to 99.9% In and 0.1 to 5% Sb. As a result, the operating temperature is in the range of 135 to 160.degree. C., requests for envi...