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Detent Wheel Position Indication

IP.com Disclosure Number: IPCOM000092085D
Original Publication Date: 1968-Aug-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Cuzner, DE: AUTHOR

Abstract

Rotation of detent wheel 1 is controlled by pawls 2 and 3 normally held out of engagement with wheel 2 by yoke 4 and spring 5. Energization of solenoid 6 pulls back yoke 4 in slide 7 against spring 5. Pawls 2 and 3 move into engagement with wheel 1 under action of pawl springs 8 and 9 to prevent rotation in either direction. Rotation of wheel 1 is monitored by transducer 10 which generates a pulse on line 11 each time a tooth 12 passes it. When wheel 1 is accelerating from rest, the first a tooth 12 passing transducer 10 has not reached full speed. The first pulse produced on line 11 is ill-defined, as in waveform c, and can be missed by output amplifier 13.

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Detent Wheel Position Indication

Rotation of detent wheel 1 is controlled by pawls 2 and 3 normally held out of engagement with wheel 2 by yoke 4 and spring 5. Energization of solenoid 6 pulls back yoke 4 in slide 7 against spring 5. Pawls 2 and 3 move into engagement with wheel 1 under action of pawl springs 8 and 9 to prevent rotation in either direction. Rotation of wheel 1 is monitored by transducer 10 which generates a pulse on line 11 each time a tooth 12 passes it. When wheel 1 is accelerating from rest, the first a tooth 12 passing transducer 10 has not reached full speed. The first pulse produced on line 11 is ill-defined, as in waveform c, and can be missed by output amplifier 13. To overcome this problem a supplementary pulse, as in waveform b, is produced on line 14 by the solenoid control circuit 15 in response to a start signal applied to line 16. A slight delay between the solenoid turnoff signal supplied to line 17, as in waveform a, and the supplementary pulse on line 14 ensures that this pulse is presented at the input to amplifier 13 at the same time as the ill-defined first pulse generated by transducer 10. Amplifier 13 thus receives the combined input of waveforms and produces output signals, as in waveform d, on output line 18 which accurately represent the amount of rotation of detent wheel 1.

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