# US 4,391,362 A · Speed controlled infeed conveyor system

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- Number: US 4,391,362 A
- Document ID: US4391362A
- Status: Granted
- Kind: A
- Application number: 06/234,680
- Filed: 1981-02-17
- Granted: 1983-07-05
- Earliest claimed: 1981-02-17
- Assignees: Nabisco Brands, Inc.
- Inventors: Louis A. Spinelli
- Web page: https://patentgrep.com/patent/US4391362A

## CPC

- B65G 43/08: Control devices operated by article or material being fed, conveyed or discharged {(and controlling the discharging devices B65G47/42)}
- Y10S 388/929: Fluid/granular material flow rate, pressure, or level
- Y10S 388/93: Load or torque
- Y10S 388/933: Radiant energy responsive device
- B65G: TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS (packaging B65B; handling thin or filamentary materials, e.g. paper sheets or thread, B65H; cranes B66C; portable mobile or lifting or hauling appliances, e.g. hoists, B66D; devices for lifting or lowering goods for loading or unloading purposes, e.g. fork-lift trucks, B66F9/00; emptying bottles, jars, casks, barrels or similar containers, not otherwise provided for, B67C9/00; delivering or transferring liquids B67D; filling or discharging vessels for liquefied, solidified or compressed gases F17C; pipe-line systems for fluids F17D)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A speed controlled conveyor system in which the motor driving an input conveyor is speed regulated to control the axial product pressure. This pressure is measured by the outward bowing of the column of articles as it moves along a downwardly curving chute connecting the conveyor and the loading device. A photocell arrangement measures the degree of displacement of the column and transmits a corrective electrical signal to a motor speed control device.

## Claims

### Claim 1

A speed controlled conveyor system for transporting a continuous column of abutting articles, said system comprising a generally horizontal infeed conveyor having an output end, a curved chute aligned with said output end and extending in a downward arc, a product handling device removing articles from the lower end of the chute, said chute being open on the side thereof facing upward and forward to permit the curved column of articles on the chute to bow outwardly when axial pressure within the column builds due to the infeed rate exceeding the removal rate, means for measuring the outward displacement of the curved column on the chute and producing a first electrical signal proportional to that displacement, a motor driving said infeed conveyor and speed control means responsive to the first signal for adjusting the speed of said motor, said means for measuring the displacement of said curved column including a light source directing a light beam so as to be progressively intercepted by the column as it bows outwardly, and a photocell for detecting the degree to which said light beam is intercepted by said column, said speed control means including a variable output magnetic clutch having an electromagnetic control coil, means producing a second electrical signal proportional to the speed of the input conveyor, and means for summing said first and second signals and producing a third signal proportional to the difference between a reference voltage and the sum of said first and second signals.

### Claim 2 (depends on 1)

Apparatus according to claim 1 wherein said first signals is passed through a filter circuit to average out short-term variations and produce an output that represents the relationship of the rate of product input to the average rate of product output.

### Claim 3 (depends on 2)

Apparatus according to claim 2 wherein said amplifier is biased to drive the conveyor at a speed to produce sufficient axial product pressure to lift the curved column into the light beam.