Automatically guiding workpieces through a machine

Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems

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318 8, 318 51, 11212111, G05B 1932

Patent

active

RE0300918

ABSTRACT:
Automatic guiding apparatus has first and second drive wheels which are driven from a common source for effecting feeding of a workpiece in a straight line through a machine. For effecting steering of the workpiece along a line parallel to the edge, a sensor senses the edge, a computer calculates the speed differential required to be imparted to the two drive wheels for steering about the center of curvature of the edge, and an adding device superimposes additional positive or negative speed on one of the drive wheels. The adding device can be mechanical, such as a differential gearbox, where the wheels are driven from a common motor, or a frequency shifter where the wheels are driven by separate stepper motors supplied with pulses from a common oscillator. Automatic speed control is incorporated for negotiating sharp corners. The drive wheels are parallel to each other. In an alternative embodiment, a pair of drive wheels feed the material through the machine with one edge in engagement with a stop and an auxiliary wheel, controlled by a servo and edge sensor, is driven in opposite directions transverse to the direction of feed for effecting steering.

REFERENCES:
patent: 3170423 (1965-02-01), Henebry
patent: 3454853 (1969-07-01), Hawkins et al.
patent: 3474747 (1969-10-01), Noiles
patent: 3559021 (1971-01-01), Bingham, Jr.
patent: 3742879 (1973-07-01), Schaefer, Jr.
patent: 3750186 (1973-07-01), Sakamoto

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