Signatures of a book are identified with a binary coded indicia on the backbone. A signature verifier having a row of indicia sensors associated with the stack of signatures in the stream feeder of a gathering machine senses the coded indicia. In the event of an error, the verifier gives an alarm or stops the stream feeder. A book of plural signatures has a plurality of indicia on the backbone. A verifier has corresponding plural rows of sensors which detect the indicia and are sampled sequentia...

The present disclosure describes an improved integrated circuit chip which includes in addition to the logic circuits for performing its design function, an additional circuit for providing a unique reference pattern in digital form useful for test purposes. This reference pattern is automatically read by the tester and gives information as to the type of chip and its final signature. The former indicates to the tester an appropriate test routine such as a pseudo-random binary sequence; and the ...

Signature verification and authentication systems are disclosed which include documents each of which bears a cryptographic representation of at least one property of a signature of an authorized user thereof modified in accordance with at least one of a set of indicia identifying the document with its authorized user. Apparatus are disclosed whereby said cryptographic representations can be decrypted and authenticated, using said indicia as a key. Apparatus are disclosed for producing such cryp...

A loose shingled stream of signatures is conveyed to a dense shingling location. A tray is supported at the dense shingling location on an elevator. A dense shingled array of signatures is formed at the dense shingling location. The elevator is raised to move the tray with the dense shingled array thereon to a tray removal location for removal from the elevator. A means is provided for removing the tray from the elevator when it is located at the tray removal location. The means for removing the...

A digital signature machine provides a simplified method of forming and verifying a signature that is appended to a digital message. A sender transmits a signature with the usual signature keys and with validation table entries that correspond to the unsent keys and with the compressed encoding of the next validation table. The receiver uses the compressed encoding of the next validation table to form validation table entries from the signature keys so that the receiver has a full validation tab...

A signature gathering machine (14) comprises a plurality of hoppers (16) which can be randomly spaced relative to one another and to collating chain pusher pins (30 a,b,etc). The hoppers (16) can be moved to various positions along a frame 70 and fixed in place at those positions. An adjustable power linkage (FIGS. 3-5 and 7) to the hoppers allows the respective synchronization of the hoppers to be set relative to the collating chain pusher pins for new positions.

The pressure exerted while writing a signature is transduced to an electrical analog signal which is periodically converted to a binary coded number representing the average amplitude of the pressure between periodic samplings.

Apparatus in which covers for magazines or the like are delivered serially to a nip formed btween a pair of matingly contoured converging conveyor belts. One belt includes an inwardly extending V-notch, and the other belt includes an outwardly extending V-shape whereby the cover is folded along a predetermined line and conveyed to a collating conveyor for assembly with other portions of the magazine. Prior to folding by the conveyor belts the cover is scored by a scoring mechanism which is readi...

A signature feeding mechanism having a shuttle plate and an associated vacuum gripper for feeding the bottom signature from a stack in a supply magazine into the bite of pinch rolls which advance successive signature pieces to a transport system for advance to a label applicator, or the like, and having a guard plate for bridging exposed portions of the gap between the leading edge of the shuttle plate and the signature receiving end of the associated transport conveyor floor so as to prevent po...

Each signature feeder along a collating conveyor is selectively actuated under control of coding on optically scanned mailing labels. To compensate for the alternating thickness of different books of signatures from the collating conveyor, the coding also controls mechanical offsets for a binding line, and is compared with readings from a continuous thickness caliper. Upon detection of a malfunction at any signature feeedere, all feeders located downstream therefrom are disabled as the defective...