Dot matrix impact printer having retractable platen
Patent 3995730 Issued on December 7, 1976. Estimated Expiration Date: 
December 7, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 7, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3616889 3776341 3815722 3837461 3868008 3894624 InventorsAssigneeApplicationNo. 563390 filed on 03/31/1975US Classes:400/649, For movement of platen other than for line-spacing101/287, BED-AND-PLATEN MACHINES400/607.1, In lateral direction (e.g., lateral shift of web or sheet carrier)400/613, With web supply or takeup or mount therefor (e.g., web cartridge, etc.)400/636By roller couple (e.g., rotatable pinch rollers, etc.)ExaminersPrimary: Rader, Ralph T.Attorney, Agent or FirmInternational ClassB41J 11/20 (20060101)AbstractA dot matrix impact printer includes a retractable platen which positions an elongated sheet of paper in a location where a print head prints a line of data on the paper. In a second mode of operation, the insertion of a form, shorter than the elongated sheet of paper, is detected by photodetecting means. The form is inserted in overlying relation to the elongated sheet, where it is juxtaposed against the retractable platen. The photodetecting means in turn activate a solenoid. Activation of the solenoid displaces relatively small rollers against the inserted form in a manner pressing the form against the elongated sheet of paper. An intermediate length of the sheet is supported by a relatively large roller which undergoes indexed movement. As the sheet undergoes indexed movement during a printing operation, so does the form. At the end of a printing operation, the solenoid automatically retracts the relatively small rollers thereby permitting the withdrawal of the form. | |
