Browse Prior Art Database

Pitch Change Device

IP.com Disclosure Number: IPCOM000078620D
Original Publication Date: 1973-Feb-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Mishler, DD: AUTHOR

Abstract

A mechanical pitch changing device is incorporated into a lead screw controlled single-element printer, for reducing costs and improving reliability.

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Pitch Change Device

A mechanical pitch changing device is incorporated into a lead screw controlled single-element printer, for reducing costs and improving reliability.

A lead screw 6 for controlling escapement of a carrier 7 has an emitter wheel 1 on one end, and a set of ratchet gears 12, 13, and 14 on the other end. Emitter wheel 1 has annular rows of openings 2, 3, and 4. The number of openings in each row 2, 3, and 4 corresponds to the number of teeth on ratchets 12, 13, and
14. Opening 5 in emitter wheel 1 is used for homing purposes. Positionable radially along and adjacent to emitter wheel 1 is a shifting block 8 carrying photosensors 10 and 11. Block 8 is shifted by an operator moving pitch selector lever 9 to any one of positions A, B, or C when a change in pitch is desired. Photosensor 10 is for sensing the Openings in rows 2, 3 and 4, and photosensor 11 is for sensing home opening 5. Regardless of the position A, B, or C of lever 9, sensor 11 can always sense opening 5. Depending on the position of block 8 and sensor 10 relative to rows 2, 3, and 4, one of the magnet/armature combinations represented by arrows 15, 16, and 17, will be activatable for controlling the starting and stopping of lead screw 6.

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