Browse Prior Art Database

Forms Carriage Horizontal Vernier

IP.com Disclosure Number: IPCOM000036733D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 3 page(s) / 68K

Publishing Venue

IBM

Related People

Wilson, JT: AUTHOR

Abstract

The horizontal vernier system disclosed herein permits tractor replacement without removing guide shafts, disconnecting either cable system, or disturbing tractors that are to remain in the printer.

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Forms Carriage Horizontal Vernier

The horizontal vernier system disclosed herein permits tractor replacement without removing guide shafts, disconnecting either cable system, or disturbing tractors that are to remain in the printer.

Figure 1 depicts a means to laterally position and tension forms

(Image Omitted)

using cable and two pairs of tractors. Tractor pair 1a and 2a at the right edge of the forms attach to rear cable 3a. Tractor pair 1b and 2b at the left edge of the forms attach to front cable 3b. Translating the right tractor pair compensates for various forms widths; translating both pairs of tractors positions the forms horizontally with respect to frame 5.

A motor and a drive belt, neither of which is shown, rotate splined drive shafts 6 and 7. The four forms tractors mount on these drive shafts and guide shafts 8 and 9. Knob assembly 10 can selectively drive rear cable 3a alone, or both front and rear cables together.

The forms path is not straight. Below lower tractors 2a and 2b it is vertical; between the tractors it is inclined at an angle; above upper tractors 1a and 1b it is inclined at twice that angle. All tractors are assembled from the same parts, some of which are rotated to form different assemblies. The drive shaft locations, guide shaft locations, and cable-clamping locations are symmetrical about a plane that is midway between tractors 1 and 2, and perpendicular to the forms path.

Each cable passes around a pulley on knob assembly 10 and seven idler pulleys 15. Pulleys for both systems are co-axially mounted in pairs. Both cable- return paths lie above their respective cable-to- tractor attachment points. This permits each cable to lie in a plane without interfering with the forms path. To accommodate tolerances and maintain the proper cable tension, both ends of rear cable 3a attach to extension spring 4a, and both ends of front cable 3b attach to extension spring 4b....