Abstract: An optical sensor is provided for each print wire of a print head and includes two glass fibers to carry light from a light-emitting diode to the surface of a record medium and to carry the reflected light to a photodiode. Each printed dot is detected and the sensor output is compared with a delayed or stored print signal which is applied to the drivers for the print wires.

Abstract: A digital printer of the print wheel controlling type comprising a timing signal generator for developing type selection controlling signals (.alpha.) for selecting a desired type mounted on the print wheel, and a wheel round detection signal (.beta.) for indicating a complete one round of the print wheel. A print control circuit is provided for detecting whether the wheel round detection signal (.beta.) is developed next after the development of the type selection controlling signals (.alpha.) by a predetermined number. If the wheel round detection signal (.beta.) is not developed at a preselected timing, the print control circuit learns an erroneous printing operation, and functions to conduct a corrected printing operation.

Abstract: According to the present editing printer, a printing head can print either on the first insertion line or on the second ordinary line by the operation of a keyboard, and the characters from the keyboard are also stored in a memory. An insertion end sign " " is printed at the end of the insertion characters on the first line. A group of characters from the first character to the character before the insertion end sign on the first line are inserted automatically in the second ordinary line by the aid of the memory, which provides clean output with no error after editing.

Abstract: Demountable, replaceable, printer ribbon cartridge transport apparatus comprising an elongated, flat, rigid, support member provided with oppositely disposed parallel recessed areas co-extensive with the longer dimension thereof and having means intermediate the ends for adjusting the length of the member and thereafter retaining the adjusted length. An endless inked ribbon is disposed within the recessed areas with each opposite end of the ribbon looped around the end of the support member and back upon itself so as to be moveable lengthwise in opposite directions along the long dimension of the support member. Demountable end caps are secured to each opposite end of the support member to protect the ribbon as it reverses direction about the end of the support and to enable the support member to be cammed into and out of engagement with ribbon drive means.

Abstract: A method and apparatus associated with word processing equipment for producing a preliminary printout of accessible lines of intermixed text characters and code characters representative of the format of such text. The apparatus includes logic controlled gates for selectively gating text codes, instruction codes, and reference line number codes to a print control coupled to, and controlling the printing by, a printer. Specific networks enable the printing of "font change" instructions and identifications and characteristic identifier symbols indicative of the presence of an instruction code. Audit print codes representing material ones of the instruction codes are substituted for the usual printer functional response to those instruction codes, that is, a code representation of the instruction code is printed instead of the printer executing the instruction.

Abstract: The system is used for imprinting indentification code on individuals of articles such as automobiles produced in quantity, particularly on an assembly line, and comprises an instruction unit to provide a data signal representing an identification code to be imprinted, a stamping machine in which setting of imprinting types is performed automatically according to the data signal, a sensor which provides a signal representing an actual state of the type setting, and a comparator which provides an operation signal to the stamping machine only when the signal from the sensor agrees with the data signal and otherwise provides an alarm signal. For further accuracy of imprinting operation, the system may include a sensor to detect the type of the individual article to be imprinted and another comprator to prevent the action of the stamping machine also when the type of the article differs from one implied by the data signal.

Abstract: A rotatable print disk is mounted on a carrier which traverses along the print line. The disk is moved from each character position to the next by the shortest distance at a constant velocity; thus, the time for the disk to move from a given character position to the next will be variable dependent on this distance. The carrier is moved from one print position to the next, a fixed distance, at a variable speed selected in order that carrier reach the next print position in synchronization with the disk reaching the next character position. Upon such synchronization, a print hammer is fired to print the character while the carriage continues on-the-fly towards the next print position.

Abstract: Spelling errors in a word processing system are detected and presented to the operator for correction at the end of a document page. A dictionary memory contains representations of the correct spellings for words most frequently used. As each word is typed, it is stored in a word queue where it is compared to the contents of the dictionary memory. If the compare is unequal, then the word and its location on the page are stored in an error memory. When an end of page indicator is set the printer automatically repositions the print head at the ending character of the first word in the error list. When the operator keys in the correct spelling, the printer is caused to remove the misspelled word from the page and type the correct spelling. The corresponding word in the error memory is also corrected. As each misspelled word in the error memory is corrected, the remainder of the memory is scanned and repetitions of the same spelling error are automatically corrected.

Abstract: A text processing arrangement employing a typewriter in conjunction with storage means, in which information supplied from a typewriter keyboard is recorded on a page and simultaneously stored in the storage means, and in the event corrections thereof are required, material which to be unchanged is read-out of storage for simultaneous re-recording and further storage, along with change information supplied by the keyboard, and simultaneously recorded and stored in association with such further stored unchanged information, means being provided for following the progress of the re-recording and indicating the corresponding instant read-out position on the initially recorded page.