Browse Prior Art Database

Carrier Support Device

IP.com Disclosure Number: IPCOM000088630D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 3 page(s) / 34K

Publishing Venue

IBM

Related People

Bernard, LP: AUTHOR [+2]

Abstract

Serial printers generally have a carrier which is traversed back and forth across the print line. A low cost, limited performance serial printer can be fabricated by utilizing a carrier which is mounted as shown above.

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Carrier Support Device

Serial printers generally have a carrier which is traversed back and forth across the print line. A low cost, limited performance serial printer can be fabricated by utilizing a carrier which is mounted as shown above.

This carrier support will allow the carrier to move freely (i.e., not bind) even if the support members are imperfect (i.e., nonparallel guide rods). Furthermore, using the above mechanism the carrier can be easily tilted back to facilitate changing of the print element. The carrier can be driven back and forth by a belt.

The carrier is guided by two substantially parallel (but not necessarily perfectly parallel) circular rods 10 and 11 (Fig. a). The first carrier support device consists of rollers 14 and 16 which engage the rod 10. These rollers dictate the direction of longitudinal carrier motion. The second carrier support device consists of rollers 18 and 20 which engage the rod 11 and holds the carrier against rotation about the rod 10. In order to accommodate a finite deviation in parallelism of the two guide rods 10 and 11 and some finite variation in guide-rod diameter, the rollers 18 and 20 are preloaded against the rollers 14 and 16 in such a fashion that the preload reaction is approximately evenly divided by the two rollers 14 and 16.

This leads to a statically determined system: The finite carrier support forces can be calculated for any combination of finite external forces on the carrier. Except for the preloading spring, no member has to deflect to accommodate imperfections of components or component mounting. A necessary condition is that the preload force on the second support device exceed the worst-case reaction of the forces imposed on the carrier.

The rollers 14 and 16 are rigidly mounted...