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Browse Prior Art Database

Ribbon-Head Drive Apparatus

IP.com Disclosure Number: IPCOM000041920D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Hunt, RE: AUTHOR

Abstract

There is shown and described an apparatus for feeding ribbon and engaging the printhead in a printer using thermal print technology. Conventionally, ribbon feed begins before the thermal head is engaged and separate solenoid-operated mechanisms were used. The described apparatus accomplishes these functions with a single solenoid. In the figure, print drum 1 rotates about shaft 2 in the printer frame (not shown). Paper is wrapped and clamped around the periphery of the drum. Carrier frame 3 moves back and forth in the direction of arrows 4 to effect printing. Ribbon feed is initiated by powering solenoid 5, moving plunger 6 in the direction of arrow 7. Plunger 6 is connected to crank 8 which rotates yoke bracket 9 through extension spring 10.

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Ribbon-Head Drive Apparatus

There is shown and described an apparatus for feeding ribbon and engaging the printhead in a printer using thermal print technology. Conventionally, ribbon feed begins before the thermal head is engaged and separate solenoid-operated mechanisms were used. The described apparatus accomplishes these functions with a single solenoid. In the figure, print drum 1 rotates about shaft 2 in the printer frame (not shown). Paper is wrapped and clamped around the periphery of the drum. Carrier frame 3 moves back and forth in the direction of arrows 4 to effect printing. Ribbon feed is initiated by powering solenoid 5, moving plunger 6 in the direction of arrow 7. Plunger 6 is connected to crank 8 which rotates yoke bracket 9 through extension spring 10. Yoke 9 pivots counterclockwise about ribbon drive shaft 11 until rubber-tired wheel 12 contacts drum 1. Drum 1 rotates counterclockwise frictionally driving wheel 12, which is fixedly attached to shaft 13, and gear 14 clockwise. Gear 14 in turn rotates gear 15 and shaft 11 counterclockwise. Ribbon drive shaft 11 is free to rotate in bearing 16 which is pressed in frame 3. Ribbon drive roller 17 is attached to shaft 11 and, when rotated counterclockwise, works in conjunction with pinch roller 18 to pull ribbon 19 past printhead 20. After the driving of ribbon 19 begins, further motion of crank member 8 rotates pin 21 and printhead 20 about post 22 into engagement with print drum 1 in order to effec...