System for orienting a rotating member

• US 4,587,467 A
• Filed: 03/14/1985
• Issued: 05/06/1986
• Est. Priority Date: 03/14/1985
• Status: Expired due to Term

• Current Assignee: RCA Corporation (General Electric Company)
• Original Assignee: RCA Corporation (General Electric Company)
• Inventors: Breiner, Bruce A.
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): Ro, Bentsu
• Application Number:
  US06/711,724
• Time in Patent Office: 418 Days
• Field of Search: 318/268, 318/269, 318/272, 318/273, 318/274, 318/275, 318/277, 318/313, 318/445, 318/450, 318/480
• US Class Current: 318/272
• CPC Class Codes: H02P 3/14 by regenerative braking

Abstract

A system for orienting a rotating member includes a slow down and a stop sensor. A logic circuit receives inputs from the sensors to slow and stop the rotating member. A slow down signal must be received before a stop signal can effect the rotations. Starting is delayed to enable the motor starting circuit to go through the necessary start up sequences.

Claims

1. A system for accurately orienting a member rotated by a motor in a desired orientation, said motor being responsive to a motor speed control means whereby said motor is controlled by said system through said motor speed control means, said system comprising:

a slow down sensor and a stop sensor located in spaced relation to said member, actuating means arranged on said rotated member for passing in close proximity to said sensors whereby said slow down sensor and said stop sensor sequentially provide slow down and stop signals to a logic control means,

said logic control means actuating said motor speed control means in response to said slow down and said stop signals whereby said motor is responsive to said slow down and said sensors; and

motor start control means responsive to said motor speed control means for delaying rotation of said motor for a predetermined time after said system is voltage actuated.

2. The system of claim 1 wherein said logic control means includes bistable logic means having separate input terminals individually responsive to said slow down signal and to said stop signal, and said bistable logic means has separate output terminals;

said system also including voltage responsive speed control switches individually responsive to said output terminals whereby said motor changes speed in response to said slow down signal and stops in response to said stop signal.

3. The system of claim 2 wherein said bistable logic means is at least one D type flip flop.

4. The system of claim 3 further including an exclusive OR gate arranged between said output terminals and one of said switches.

5. The system of claim 4 wherein said motor start control means includes monostable logic means, and time delay means for delaying the output of said monostable logic means for a predetermined period of time.

6. The system of claim 5 wherein said monostable logic means is a one-shot.

7. The system of claim 1 further including logic means arranged between said stop sensor and said logic control means for preventing said motor from responding to a stop signal prior to the reception of a slow down signal.

8. The system of claim 7 wherein said logic means is a NAND gate.

9. The system of claim 2 further including logic means arranged between said stop sensor and said logic control means for preventing said motor from responding to a stop signal prior to the reception of a slow down signal.

10. The system of claim 9 wherein said logic means is a NAND gate.