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Backspacing Mechanism

IP.com Disclosure Number: IPCOM000096447D
Original Publication Date: 1963-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Wehmer, BF: AUTHOR

Abstract

Dictating machine 1 with microphone 2 has a compact backspacing mechanism. Certain basic machine functions including the recording and reproducing (listen) functions are under control of control lever 3. This is movable within an opening 4 from an upper Record position to a lower Review position. Machine 1 has magnetic belt 5 that is moved in a direction indicated by arrow 6 past transducer 7. Transducer 7 is mounted on carriage assembly 8 that is moved from left to right by means of lead screw 9 during recording and reproduction. Carriage 8 has extended edge 11 of which is normally positioned for engagement with serrated edge 11 of rotatably mounted bar 12. Carriage 8 is backspaced a distance equal to one tooth of lead screw 9 by rotation and sideways movement of bar 12 and pawl 10 under control of lever 3.

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Backspacing Mechanism

Dictating machine 1 with microphone 2 has a compact backspacing mechanism. Certain basic machine functions including the recording and reproducing (listen) functions are under control of control lever 3. This is movable within an opening 4 from an upper Record position to a lower Review position. Machine 1 has magnetic belt 5 that is moved in a direction indicated by arrow 6 past transducer 7. Transducer 7 is mounted on carriage assembly 8 that is moved from left to right by means of lead screw 9 during recording and reproduction. Carriage 8 has extended edge 11 of which is normally positioned for engagement with serrated edge 11 of rotatably mounted bar 12. Carriage 8 is backspaced a distance equal to one tooth of lead screw 9 by rotation and sideways movement of bar 12 and pawl 10 under control of lever 3. Bar 12 is spring loaded to the right by spring 13. Extension 14 of bar 12 acts as a follower on face cam 15. Cam 15 is mounted as a bushing and is free to rotate within the limits of slot 16 and stationary pin 17.

In order to actuate the backspacing mechanism, lever 3 is pulled downward to the Review position. Attached to a lower extremity of lever 3 is link 18 which, in turn, is attached to head lifter arm 19. Arm 19 in turn is attached by link 20 to extension 21 on bar 12. Movement of lever 3 causes rotation of bar 12. When bar 12 is rotated, pawl 10 is lifted and, in turn, takes carriage 8 up and away from lead screw 9. Pressure of extension 14 against face cam 15 results in rotation of cam 15 to the limit of slot 16. Continued rotation of bar 12 causes extension 14 to ride up the surface of cam 15, adding a longitudinal movement to bar 12. This results in a backspacing movement of carri...