# US 5,347,203 A · Control system, especially for film and video tape transport

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- Number: US 5,347,203 A
- Document ID: US5347203A
- Status: Granted
- Kind: A
- Application number: 07/730,687
- Filed: 1991-07-16
- Granted: 1994-09-13
- Earliest claimed: 1990-10-30
- Assignees: Rank Cintel Limited
- Inventors: Peter R. Swinson
- Web page: https://patentgrep.com/patent/US5347203A

## CPC

- G11B 15/10: Manually-operated control; Solenoid-operated control {(G11B15/44 takes precedence)}
- G11B 15/46: Controlling, regulating, or indicating speed {(dependent on position of tape in reserve, loop G11B15/56, G11B15/58)}
- G11B 15/54: by stroboscope; by tachometer
- H02P 23/16: Controlling the angular speed of one shaft (H02P23/18 takes precedence)
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

A control device for a film or tape transport comprises a control knob having a spindle which forms the rotor of an electric motor. The control knob is spun by the operator to generate a drive signal to advance or retard the film or tape driven by the transport system at a speed dependent on the speed of rotation. The rotational speed is sensed and a signal dependent thereupon is produced by a speed detector to control a servo-loop which drives the electric motor. The motor drives the control knob at substantially the same speed imparted by the operator without any further input by the operator. The control knob continues to be driven at this speed until the operator manually accelerates or decelerates the control knob.

## Claims

### Claim 1

A control device for a system, comprising:
rotatable control means for varying a parameter of said system to be controlled;
sensing means for sensing a speed and sense of rotation of said rotatable control means imparted thereto by an operator; and
motor means for driving said rotatable control means to maintain constant speed and sense, at substantially the sensed speed and sense, after setting by the operator.

### Claim 2 (depends on 1)

The control device of claim 1, further comprising a servo-loop for operating said motor means to rotate the rotatable control means at the sensed speed;
wherein said sensing means includes controlling means for controlling said servo-loop.

### Claim 3 (depends on 2)

The control device of claim 2, wherein said controlling means for controlling said servo-loop includes means for energizing said servo-loop only when the sensed speed of said rotatable control means is greater than a predetermined value.

### Claim 4 (depends on 1)

The control device of claim 1, wherein said rotatable control means has a spindle forming the rotor of said motor means, and said sensing means senses a back EMF produced by said motor means on rotation of said spindle.

### Claim 5 (depends on 1)

The control device of claim 1, wherein said rotatable control means has a spindle forming the rotor of said motor means and said sensing means comprises a shaft encoder attached to said spindle.

### Claim 6 (depends on 1)

The control device of claim 1, wherein the system controlled is a film or tape transport system and the capstan of the transport system is maintained by said motor means at a constant speed.

### Claim 7 (depends on 1)

The control device of claim 1, wherein the device controls the rate of movement of film through a telecine.

### Claim 8 (depends on 1)

The control device of claim 1, wherein the control device controls the rate of a continuously variable parameter of said system.