Browse Prior Art Database

Tape Feeding and Column Sensing Device

IP.com Disclosure Number: IPCOM000073945D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Dombroski, EL: AUTHOR

Abstract

The drawing shows an incremental drive for operating a tape 2 past a tape head 3. A sprocket 4 drives the tape past the head in response to a signal indicating that a next character is to be read or written. Elements 5 form tape loops that isolate the tape at sprocket 4 from the tape reels. A second sprocket 6 advances tape from a reel 7 or a reel 8 in response to signals generated by tape loop sensing lights 9 and photocells 10 mounted on elements 5. Since a fixed length of tape exists to the left of sprocket 6, only one of the two loops is sensed. Sprocket 6 is connected to a wheel 11 that frictionally drives wheels 12 and 13. Reels 7 and 8 are coupled to wheels 12 and 13 through one-way clutches 14, 15 that engage only when the reel is driven to pick up tape.

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Tape Feeding and Column Sensing Device

The drawing shows an incremental drive for operating a tape 2 past a tape head 3. A sprocket 4 drives the tape past the head in response to a signal indicating that a next character is to be read or written. Elements 5 form tape loops that isolate the tape at sprocket 4 from the tape reels. A second sprocket 6 advances tape from a reel 7 or a reel 8 in response to signals generated by tape loop sensing lights 9 and photocells 10 mounted on elements 5. Since a fixed length of tape exists to the left of sprocket 6, only one of the two loops is sensed. Sprocket 6 is connected to a wheel 11 that frictionally drives wheels 12 and 13. Reels 7 and 8 are coupled to wheels 12 and 13 through one-way clutches 14, 15 that engage only when the reel is driven to pick up tape. Slippage between the pickup reel and the clutch mechanism allows the reel to slow down to maintain a constant speed of tape from sprocket 6. The maximum tape diameter of a reel is low enough in relation to the ratio of friction wheel 11 to wheels 12 and 13 to maintain the one-way clutch disengaged on the takeout reel.

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