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Backspacing Mechanism

IP.com Disclosure Number: IPCOM000096641D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Wehmer, BF: AUTHOR

Abstract

The mechanism backspaces the carriage and sound head of a dictating machine. Sound head 1 is supported by carriage 2 in engagement with magnetic belt 3. During recording and reproducing operations carriage 2 moves in a forward direction indicated by arrow 4. In order to listen to previously recorded material or make corrections, it is necessary to backspace carriage 2 in the direction indicated by arrow 5. Carriage 2 is moved in the forward direction as a result of the rotation of lead screw 6 as indicated by arrow 7. Carriage 2 is maintained in a predetermined relationship with screw 6 by means of sliding shoe 8 and roller 9. Movement of carriage 2 is effected through engagement of follower pawl 10 and a second pawl 11 with threads of lead screw 6. Pawl 10 is mounted on pivot 12 that is fixed to carriage 2.

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Backspacing Mechanism

The mechanism backspaces the carriage and sound head of a dictating machine. Sound head 1 is supported by carriage 2 in engagement with magnetic belt 3. During recording and reproducing operations carriage 2 moves in a forward direction indicated by arrow 4. In order to listen to previously recorded material or make corrections, it is necessary to backspace carriage 2 in the direction indicated by arrow 5. Carriage 2 is moved in the forward direction as a result of the rotation of lead screw 6 as indicated by arrow 7. Carriage 2 is maintained in a predetermined relationship with screw 6 by means of sliding shoe 8 and roller 9. Movement of carriage 2 is effected through engagement of follower pawl 10 and a second pawl 11 with threads of lead screw 6. Pawl 10 is mounted on pivot 12 that is fixed to carriage 2. Pawls 10 and 11 are pivotally joined at 13.

In order to backspace carriage 2, solenoid 14 is energized. Armature 15 which is pivoted at 16 swings toward solenoid 14. Actuator portion 15a of armature 15 is engaged with extension 10a of pawl 10. As a result of the movement of armature 15, pawl 10 becomes disengaged from screw 6. At this time, pawl 11 is still in engagement with screw 6. Disengagement of pawl 10 results in a toggle action between pawls 10 and 11 about pivot 12 so that pivot point 13 moves upwardly. Carriage 2 is thus moved in a direction indicated by arrow 5. The relationship of the elements is such that carriage 2 and pawl...