Abstract: A nozzle structure in a crystallographically oriented, monocrystalline silicon includes a pyramidal opening anisotropically etched from the entrance side of the nozzle and truncated in a membrane having a smaller cross-section than the initial cross-section of the entrance opening. The membrane has extending therethrough a pyramidal opening etched anisotropically from the exit side. The vertical axes of both openings are substantially concentric.
October 24, 1986
Date of Patent:
March 29, 1988
AT&T Teletype Corporation
Herbert A. Waggener, Joseph C. Zuercher
Abstract: A tool for insertion and extraction of a packaged IC to and from a socket includes a pair of flexible, parallel arms joined at two ends by a "U" shaped portion. The free ends of the two when moved towards each other are adapted to grip the IC at opposite ends and allow a rocking motion to be applied to loosen the pins of the IC within the socket and then for a lifting force to be applied to remove the IC the socket, all with minimum distortion of the pins. A plunger having a base which is positioned and is free to move between the two parallel walls within the "U" is used to insert an IC into its socket. The IC is positioned between the two walls of the "U" with the pins of the IC pointing outwards and the surface opposite the pins in contact with the base of the plunger. The IC is retained within the "U" by a predetermined interference fit between the walls and the IC.
Abstract: A wire matrix print head has a plurality of print wires each operatively connected to an armature and a core with a predetermined space formed between said armature and said core. The print ends of all wires are simultaneously aligned with the open end of the housing closest to the point of printing by a single operation. The alignment is in proportional relationship with the dimension of the space between an armature and a related core.
Abstract: The illustrated receiver 6, in flip-flops 16A-D, stores four sequential samples of a biphase-L signal A1 and shifts the samples into four shift registers 24A-D. The sampled signals are clocked through their respective shift registers 24A-D by selected phases of multiphase clock .phi..sub.1, .phi..sub.2, .phi..sub.3, .phi..sub.4. Thus, each set of four samples is stationary at some location in their respective shift registers for the same clock cycle. A decoder section 10 responds to a transition between adjacent signal levels at the output of the shift registers 24A-D and to a previously sampled signal level A44. The decoder section 10 generates a control signal A32-D32 indicating the detection of a mid-bit biphase-L signal transition. A second storage means responds to the control signal A32-D32 and stores a shift register 24A-D signal level A19, B20-D20 which occurred subsequent to the detected mid-cell transition.
Abstract: An adjustable time delay circuit 10, 50 includes a time delay line 12 including a plurality of series connected time delay units 18a-p. During adjustment, sampled signals along the delay line 12 are compared with a reference signal by NOR-gates 22e-m. Upon a comparison being attained, the output of the corresponding NOR-gate 22e-m sets a selected flip-flop 30e-m which in turn routes the signal at a selected delay line tap 38e-m through a NOR-gate 34e-m to an output OR-gate 40. The tap 38e-m selected, compensates for component propagation characteristics thus maintaining a predetermined time delay through the time delay circuit 10.
Abstract: A wire matrix print head movable along a print line has a pair of guides containing print wires arranged in two parallel columns. Horizontally movable sloped platforms are provided for moving the guides vertically relative to each other so as to change the alignment of the wires in one guide with those in the other guide, thereby changing high speed mode of printing to high quality mode, and vice-versa.
Abstract: A paper transport apparatus is illustrated which strips a single sheet of paper 16 from a stack 18 using a stripping roller 20 and cooperating fingers 22. The sheet of paper 16 is directed between the nip of a pressure roller 26 and a transfer roller 28. The transfer roller 28 is mounted on a drive mechanism 30 and is selectively positioned against a transfer drum 40 carrying an ink pattern by a cam 66, follower 72 and a spring 60 combination. The paper 16 is driven by the transfer roller 28 in contact with the drum 40 and discharged along a shelf 52 guided by a belt 50.
Abstract: A cartridge using an endless printer ribbon includes a re-inker and a drive assembly which pulls the ribbon through the re-inker and advances it while folding it in fan fold fashion into a storage compartment. The fan folds are compressed before they exit from the storage compartment into an expansion area where the fan folds unfold. From the expansion chamber the ribbon passes through a straightening compartment to ensure that all the folds in the ribbon have been eliminated before the ribbon leaves the cartridge.
Abstract: A digital receiver (40) includes a differential amplifier (42) providing data signal E and a control signal F. The level of the control signal F is related to the average level of the data signal E. A slicing circuit 44 includes series connected transistors (46, 48), the gates of which receive the data signal E. A third transistor (52) is connected to provide hysteresis to the slicing circuit, and a fifth transistor (54) is connected in parallel with the third transistor (52). The control electrode of the transistor (52) receives the control signal F from the differential amplifier (42).
Abstract: A method of manufacturing a thermal print head includes the step of coating a channel 12 of a fixture 10 with a first adhesive 26. Integrated circuit packages 20 are placed in the channel 12 with heating elements 22 disposed toward the bottom 14 of the channel 12. The packages 20 are held in position by a jig 30 while the adhesive 26 is thermally activated. A groove 52 in the face of a heat sink 50 is filled with a first part 54 of a two part adhesive and the integrated circuit packages 20 coated with the second part 56 of the two part adhesive. The alignment fixture 10 is positioned over the heat sink 50 activating the two part adhesive. The temperature of the assembly is elevated causing the first adhesive 26 to release and the second adhesive 54, 56 to further cure thus securing the packages 20 to the heat sink 50. Printed circuit cables 60, 70 are soldered to the packages 20.
Abstract: A platen assembly, including a cylindrical platen, for advancing a web of record material through a printing device, the record material having perforations along its borders for receiving pins disposed in pin sprocket wheel assemblies mounted on opposite ends of the platen.
Abstract: A tilt mechanism for a stand-alone keyboard includes two molded springs located within the keyboard enclosure. One end of each spring is anchored within the enclosure while the other end shaped in the form of a foot is free to move through openings located in the bottom portion of the keyboard. Notches located on the outer periphery of each foot are adapted to engage an edge of the opening locking the foot in place after a required length of the foot extends from the enclosure.
Abstract: A receiver for a biphase-L signal A is described which includes a line-up detector 14 generating a circuit initialization pulse. A preamble detector 40 is responsive to a preamble of the incoming biphase-L signal A. A sampling signal generator 17 is responsive to the signal from the preamble detector 40, to the biphase-L signal A and to a second control signal. The output C of a time delay line 34 supplies the second control signal, and the input to the delay line 34 is supplied by the sampling signal generator 17. The output data signal H is generated by a flip-flop 54 which samples the biphase-L signal A at times determined by the output G of the sampling signal generator 17.
Abstract: A mechanism for tilting a display screen of a CRT housed in a cabinet includes a projection extending from the bottom surface of the cabinet for supporting one end of the cabinet and providing a pivot point for tilting the cabinet. A foot slidably mounted at the other end of the cabinet supports that end at a selectable height; the foot having a ratchet rack on one of its surfaces is normally engaged by a detent lever locking the foot in position.
February 6, 1984
Date of Patent:
December 3, 1985
AT&T Teletype Corporation
Kenneth R. Kirpluk, Kenneth F. Lewinski