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Backspacing Mechanism

IP.com Disclosure Number: IPCOM000096038D
Original Publication Date: 1964-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Dollenmayer, WL: AUTHOR

Abstract

The mechanism in the upper drawing effects backspacing of sound head 1 in relation to a record media, such as magnetic belt 2. Movement of head 1 during recording and reproduction is in the direction indicated by arrow 3. Movement of head 1 during backspacing is in the direction indicated by arrow 4. Head 1 is mounted in frame 5 by means of screw 6. Frame 5 is slideably mounted for movement on rod 7. In the lower drawing, frame 5 has detent 8 that is maintained in engagement with lead screw 9 by detent spring 10. Rotation of leadscrew 9 results in the forward movement of frame 5 and head 1.

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Backspacing Mechanism

The mechanism in the upper drawing effects backspacing of sound head 1 in relation to a record media, such as magnetic belt 2. Movement of head 1 during recording and reproduction is in the direction indicated by arrow 3. Movement of head 1 during backspacing is in the direction indicated by arrow 4. Head 1 is mounted in frame 5 by means of screw 6. Frame 5 is slideably mounted for movement on rod 7. In the lower drawing, frame 5 has detent 8 that is maintained in engagement with lead screw 9 by detent spring 10. Rotation of leadscrew 9 results in the forward movement of frame 5 and head 1.

Associated with frame 5 is backspace button 11 and backspace arm 12 that is movably mounted on frame 5 by studs 13 and 14. Spring 15 maintains arm 12 in an upper disengaged position with respect to lead-screw 9.

A backspacing operation is performed by depressing button 11. The preload on spring 15 is so adjusted that detent 8 is first disengaged from leadscrew 9 before relative motion occurs between arm 12 and frame 5. Continued movement of arm 12 downwardly results in engagement of backspace detent 16 with leadscrew 9, overcomes the preload exerted by spring 15, and causes arm 12 to pivot about detent 16 at its point of engagement with leadscrew 9. Since arm 12 is also pivoted on frame 5 by stud 14, the assembly moves in the backspace direction. The extent of motion or backspacing distance is controlled by the length of slot 17 and the relative positions...