The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 14, 1989
Filed:
Feb. 22, 1988
Richard D Nordlof, Rockford, IL (US);
Gary D Reding, Roscoe, IL (US);
Jeffery S MacDonald, Cherry Valley, IL (US);
Rapid-Air Corporation, Rockford, IL (US);
Abstract
A stock feed apparatus for feeding strips of stock to or from a stock processing machine to maintain a loop in the stock. The feed means is arranged to feed stock to or from the loop at speed correlative with the amplitude of a control voltage applied to the motor control. The stock loop sensor produces a first digital signal when the loop exceeds a first limit and a second digital signal when the loop exceeds a second limit. A loop control circuit is operative in response to the first digital signal to apply a control voltage of a first preselected amplitude to the motor control to drive the feed apparatus at a first speed until the loop moves away from the first limit and responsive to the second digital signal to apply a control voltage of a second preselected amplitude to drive the feed apparatus at a second speed until the loop moves away from the second limit. The loop control circuit also includes an up/down counter device and an analog switch device that is for applying a variable control voltage to the motor controller, when the loop is intermediate its first and second limits, and which is operative in response to the first digital signal to change the amplitude of the variable control voltage a step towards the first amplitude and operative in response to the second digital signal to change the amplitude to the variable control voltage a step toward the second preselected amplitude.