Device for determining the angular position of the drive shaft i

Details Device for determining the angular position of the drive shaft i Device for determining the angular position of the drive shaft i

1989-03-17

1991-01-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, G01D 534

Patent

active

049888650

ABSTRACT:
In a position indicating device, especially for an industrial sewing machine, with a slotted wheel (3) and a first track (6) of slots (4) having, e.g., 512 slots (4), to permit a null-point synchronization over a relatively small range of rotational angles, and the establishment of definite angular positions, a second track (8) with slots (7) of various widths is provided. The first track (6) of slots (4) is associated with two light barrier arrangements comprising emitters (11a, 11b), receivers (12a, 12b), and masks (13a, 13b) while the second track (8) is associated with one light barrier arrangement. Evaluating systems are connected to the receivers (12) so that, on the basis of the number of slots (4) of the first track (6), the size of the slots (7) passing in each case and corresponding approximately to a multiple of the slot width may be determined through evaluating systems (14, 28) connected to the output, and in this manner to define the rotary angle position.

REFERENCES:
patent: 3381288 (1968-04-01), Van Vlodrop
patent: 3591842 (1971-07-01), Seewald
patent: 3982106 (1976-09-01), Stutz
patent: 4602242 (1986-07-01), Kimura
patent: 4616131 (1986-10-01), Burkhardt
patent: 4623790 (1986-11-01), Stossel
patent: 4680466 (1987-07-01), Kuwahara et al.
patent: 4751888 (1988-06-01), Hanus

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