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Incremental Advance Mechanism

IP.com Disclosure Number: IPCOM000081156D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Ecker, ME: AUTHOR [+3]

Abstract

This device is a means for incrementally advancing a sheet with high accuracy and reliability. It is useful in portable line printers where the paper is moved a line at a time across a print head.

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Incremental Advance Mechanism

This device is a means for incrementally advancing a sheet with high accuracy and reliability. It is useful in portable line printers where the paper is moved a line at a time across a print head.

As shown in the figures, print head 10 is disposed transversely with respect to the direction of the movement of paper 11. The print head may be a set of thermal resistors which are responsive to electric pulses from printing circuitry, not shown. Opposed and parallel to the surface of print head 10 is an elastomeric diaphragm 13, positioned so as to produce a gap slightly greater than the nominal thickness of paper 11. Disposed normal to diaphragm 13 and aligned with the row of elements on the print head, is a knife-edge wedge 14. This is actuated by suitable mechanical linkage coupled to solenoid plunger 15. Energization of solenoid 17 produces two coacting functions: incremental advance plus clamping of paper 11 along the row of elements on head 10.

The incremental advance is effected by the clockwise rotation of rubber puck
16. Paper 11 is trapped between puck 16 and a spring roller 18. Wedge 14 can displace diaphragm 13 only when paper 11 is completely motionless.

The short incremental motion is produced by a notched yoke 20 attached to plunger 15. The notches on yoke 20 engage a pair of pins 29 and 32 to produce a precise chordal displacement of pin 29. Pin 32 stops the yoke 20. Rivet 25 connects a link 26 to one-half of split plunger...