Browse Prior Art Database

Print Head Transport Mechanism

IP.com Disclosure Number: IPCOM000084712D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Carmichael, MW: AUTHOR

Abstract

In essence, the low-cost printer shown consists of matrix print head 1 mounted over paper 2 and constrained to follow path 3 by a high-performance, four-bar linkage.

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Print Head Transport Mechanism

In essence, the low-cost printer shown consists of matrix print head 1 mounted over paper 2 and constrained to follow path 3 by a high-performance, four-bar linkage.

Motor 4 drives feed roll 5 by worm gear 6 and drives crank 7 through meshed spur gears 8. Print head 1 is mounted on coupler link 9 which is pivotally connected between crank 7 and rocker bar 10. Pivots 11 and 12 are, of course, fixed.

Paper 2 is pulled continuously from reel 13 of paper stock by feed roll 5. Under logic circuit control, individual wires 14 of print head 1 are fired at selected points along path 3 to build up the desired printed message. Path 3 is so shaped that relative to paper 2 its motion is horizontal during the print portion of the cycle: printing can occur during both directions of travel of head 1 over paper 2.

Timing pulses can be derived from an emitter, not shown, attached to rocker bar 10 or some other part of the four-bar linkage. The design of the coupler curve is dictated by the number, length and spacing of print lines required. The emitter can be designed so that it compensates for any deviation of print head 1 from relative straight line motion and for any deviation from constant speed.

The mechanism described is suitable for thermal, electrostatic and inked ribbon or other impact printing techniques.

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