Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Typewriter Head Element Rotate and Shift Mechanism

IP.com Disclosure Number: IPCOM000083925D
Original Publication Date: 1975-Aug-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Craft, JA: AUTHOR

Abstract

The mechanism consists of a one-piece rack 10 with teeth on both sides 12, 14, head rotate gear 16, two pinion gears 18, 20 and overcenter actuating mechanism 22.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 82% of the total text.

Page 1 of 2

Typewriter Head Element Rotate and Shift Mechanism

The mechanism consists of a one-piece rack 10 with teeth on both sides 12, 14, head rotate gear 16, two pinion gears 18, 20 and overcenter actuating mechanism 22.

When rack 10 is translated into or out of the page as viewed, it imparts rotary motion to head gear 16 by either pinion gear 18 or 20 depending on which one is engaged (reference to Fig. 1). With actuator 22 in the position as shown in Fig. 1, pinion gear 18 is engaged with both rack 10 and gear 16. Pinion gear 20 is down and therefore engaged with rack 10 only. As rack 10 translates down into the page, it imparts rotary motion (CCW) to the head 28 thru pinion 18 and gear
16. The amount of head rotation is determined by external means, such as a barrel cam and follower.

To obtain case shift, rack 10 is translated to its extreme position (6 units of rotate). Then overcenter actuator 22 is moved by pneumatic and/or magnet actuators which, in turn, pushes pinion 18 down and allows pinion 20 to come up in mesh with gear 16. Pinions 18, 20 are mounted on studs 24, 26 and are spring biased up as shown in Fig. 1. As rack 10 restores home, pinion 20 is rotated clockwise, thereby rotating the head 28 counterclockwise thru gear 16. The head has now been rotated 180 degrees to accomplish case shift.

To obtain plus and minus units of rotation the sequence is the same as above, except the selecting of pinions 18, 20 is done at the home position.

Pinions 18, 20 are a...