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:
May. 01, 1990
Filed:
May. 26, 1988
Loring J Dohm, Troy, MI (US);
Lawrence B Judge, Sterling Heights, MI (US);
Dwight M Morgan, Pontiac, MI (US);
GMF Robotics Corporation, Auburn Hills, MI (US);
Abstract
An end effector device is mounted on the arm of a robot for movement through a predetermined motion relative to control axes of the robot under control of a robot controller which also controls a driver of the device to apply at least one variable programmed drive force to a first part relative to a second part at a work station. Preferably, the driver includes a screwdriver which is driven by an electric motor which, in turn, is controlled to apply a variable programmed torque at a variable programmed speed to a screw. The screwdriver and its electric motor are mounted on a slide for movement between extended and retracted positions relative to a base of the device. An air cylinder is coupled to the slide and is controlled to linearly move the slide so that the screwdriver applies a variable programmed axial force to the screw. The driver has a drive compartment formed therein which is maintained under a negative pressure for receiving and retaining the screw. For clean room applications of the device, the driver has a work compartment formed therein which is maintained under a second negative pressure. The work compartment is in fluid communication with the screw and the second part during driving thereof to evacuate any particulate from the work compartment.