Browse Prior Art Database

Beltless Tractor

IP.com Disclosure Number: IPCOM000043750D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Cross, RG: AUTHOR

Abstract

This article describes the use of molded plastic parts to form a beltless drive used to move edge-perforated paper in paper feed mechanisms used in printers and the like. A series of molded plastic parts 1 make up the beltless drive, as shown in Fig. 1. The tractor pin drive parts 1 ride on an involute drive sprocket 2. Molded as part of each drive tractor part 1 is a paper drive pin 3. Side pins 4, in end view Fig. 2, are used to guide the tractor when moving through guide covers 5a and 5b. Fig. 3 shows the molded tractor part 1 with the pin 3 for driving the paper, a cavity 6 to accommodate a sprocket drive gear tooth 7, and side pins 4 for guiding the tractor paper drive pin parts within the two side retaining members 5a and 5b.

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Beltless Tractor

This article describes the use of molded plastic parts to form a beltless drive used to move edge-perforated paper in paper feed mechanisms used in printers and the like. A series of molded plastic parts 1 make up the beltless drive, as shown in Fig. 1. The tractor pin drive parts 1 ride on an involute drive sprocket 2. Molded as part of each drive tractor part 1 is a paper drive pin 3. Side pins 4, in end view Fig. 2, are used to guide the tractor when moving through guide covers 5a and 5b. Fig. 3 shows the molded tractor part 1 with the pin 3 for driving the paper, a cavity 6 to accommodate a sprocket drive gear tooth 7, and side pins 4 for guiding the tractor paper drive pin parts within the two side retaining members 5a and 5b. When assembled, the individual tractor drive parts 1 actually push each other to form a continuous tractor drive mechanism. The molded tractor parts 1 are held in place by the two side retaining guide members 5a and 5b, which can be removed when replacing an individual molded tractor part 1.

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