Browse Prior Art Database

Automatic First Writing Line Mechanism

IP.com Disclosure Number: IPCOM000051493D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 3 page(s) / 72K

Publishing Venue

IBM

Related People

Sweat, RH: AUTHOR

Abstract

The present structure provides an automatic first writing line mechanism without a separate motor for bail and feed roll actuation in an impact printer. The structure should lower the cost of a first writing line mechanism through the reduction of the number of parts which coact to produce the desired results.

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Automatic First Writing Line Mechanism

The present structure provides an automatic first writing line mechanism without a separate motor for bail and feed roll actuation in an impact printer. The structure should lower the cost of a first writing line mechanism through the reduction of the number of parts which coact to produce the desired results.

The key to the operation is that the first writing line sequence is initiated by the operator moving lever 1 (Fig. 1) to its forward position and returning the same to that position instead of customarily just pressing a switch. The "release" position of lever arm 1 removes both sets of feed rolls 16 and 17 from platen 10 but does not open bail 8.

The operation will be described in detail with respect to Figs. 1 and 1A. 1. The operator initiates the sequence by moving lever arm 1 from its rear position to its forward position. Lever arm 1 rotates on pin 19 and is acted upon by overcenter spring 15. After passing the middle of its cycle, position C, spring 15 will drive lever arm 1 to the end of its motion, position E. Spring comb arm 2 is connected to lever arm 1 by rolling link 14. Pickup arm 3 is connected to spring comb arm 2. As lever 1 moves from position A (most rearward position) to position B, spring comb arm 2 rotates shaft 20 causing disengagement of the front feed rolls 17 in response to the action of spring comb 21 on feedroll rocker assembly 22. During the same motion, pickup arm 3 is moved into engagement slot 18 on section wheel 4. It should be noted that further rotation of pickup arm 3 will cause rotation of section wheel 4 due to the capture of pickup arm 3 in engagement slot 18. 2. As lever arm 1 moves from position B to position C, it will cause pickup arm 3 to rotate section wheel 4 and spring comb arm 2 into the "release" position. At this position, lever arm 1 may be moved sideways to engage a retaining slot for the lever in the cover (see Fig. 2 which shows the pattern for lever arm 1). Note that neither set of feed rolls is engaged in this position. 3. As lever arm 1 is rotated from position C to position D, spring comb arm 2 and section wheel 4 continue to rotate with shaft 20 until at position D, pickup arm 3 releases section wheel 4 (by losing contact with engagement slot
18). Pinned with section wheel 4 to rotate on the same shaft are fractional gear 5 and bail cam 6. At position D, fractional gear 5 has rotated until it is engaged with platen gear 7, corresponding to angle Theta in Fig. 3 which shows the discrete rotations during a cycle of section wheel 4. 4. As lever arm 1 is rotated from position D to position E, rear feedrolls 16 close on platen 10 in response to the rotation of shaft 20 by action of spring comb 21 on feedroll rocker assembly 22. Also, U-shaped bracket 13 is contacted by spring comb arm 2 and, at position E, slides into contact with hysteresis switch 12. 5. Upon reaching position...