Browse Prior Art Database

Platen Index Motor Mounted Within Platen

IP.com Disclosure Number: IPCOM000038717D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Mink, JW: AUTHOR

Abstract

A platen for a typewriter or printer has its indexing motor mounted within its hollow interior to increase the available space within the typewriter or printer for other elements. A platen 1 has a motor 2, which may be a small stepper motor or an encoded DC motor, mounted within its hollow interior and driving the platen 1. The platen 1 includes a plastic outer cover 3 and an inner metal portion 4 having a ring gear 5 secured thereto. The platen 1 has its ends rotatably supported in end caps 6 and 7 with each of the end caps 6 and 7, having a large hole (shown at 8 in the end cap 7) for ventilation. The motor 2 has a sun gear 9 on its output shaft and meshing with a planetary gear 10, which also meshes with the ring gear 5. Thus, the motor 2 can rotate the platen 1 in either direction.

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Platen Index Motor Mounted Within Platen

A platen for a typewriter or printer has its indexing motor mounted within its hollow interior to increase the available space within the typewriter or printer for other elements. A platen 1 has a motor 2, which may be a small stepper motor or an encoded DC motor, mounted within its hollow interior and driving the platen 1. The platen 1 includes a plastic outer cover 3 and an inner metal portion 4 having a ring gear 5 secured thereto. The platen 1 has its ends rotatably supported in end caps 6 and 7 with each of the end caps 6 and 7, having a large hole (shown at 8 in the end cap 7) for ventilation. The motor 2 has a sun gear 9 on its output shaft and meshing with a planetary gear 10, which also meshes with the ring gear 5. Thus, the motor 2 can rotate the platen 1 in either direction. The motor 2 has a plug 11 connected to a plug 12 on a circuit board 13 to supply power from a cable 14 to the motor 2. The motor 2 is prevented from rotation by mount lugs 15 on the end cap 6. Each of the end caps 6 and 7 may have a tab 16 (as shown for the end cap 7) at its bottom end with an opening 17 therein for cooperation with a latch within a latching box 18, which is mounted on a side frame 19. The end caps 6 and 7 could be mounted on the bottom cover rather than the side frames (one shown at 19), if desired. If desired, each of the end caps 6 and 7 may have a bearing race 20 to ease rotation of the platen 1. However, the torque of t...

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