Browse Prior Art Database

Incremental Feed Mechanism

IP.com Disclosure Number: IPCOM000078364D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Ehrenberg, JR: AUTHOR [+5]

Abstract

Tape or web elements may be advanced in small equal increments with positional accuracy. The tape may be advanced in increments, for example, 0.015 inches at a displacement speed of an increment every 50 milliseconds with the linkage arrangement shown. Other embodiments could yield higher speeds.

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Incremental Feed Mechanism

Tape or web elements may be advanced in small equal increments with positional accuracy. The tape may be advanced in increments, for example,
0.015 inches at a displacement speed of an increment every 50 milliseconds with the linkage arrangement shown. Other embodiments could yield higher speeds.

In one embodiment shown in Fig. 1, the feed mechanism may be employed in a printer. A supply of tape 10 is fabricated to have an implanted tension. The tape is extended through a guide 12 including a pair of friction pads 14 and print head 16. The pads 14 inhibit the paper from advancing in the opposite direction towards the supply 10. A drive lever 18 is adapted to be pivoted at points A and
B. An electromagnet 20 is attached to one end of the lever 18. At the other end of the lever a roller 22 and platen 24 cooperate with the print head 16. The lever also includes an arm 26 which is raised and lowered as the lever travels. The arm cooperates with a stop 28.

Energizing the electromagnet causes the lever 18 to rotate at point A in a clockwise direction. Rotation first forces the roller 22 and platen 24 against the print head 16 with sufficient pressure to clamp the paper and maintain contact with the printing device. As the lever continues to move beyond this point, rotation will begin at point B causing the arm 26 to raise the paper 10 against the stop 28.

During this portion of the cycle, the roller 22 will continue to apply pressure against...