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:
Nov. 30, 1976
Filed:
May. 15, 1975
George J Zahradnik, Wheaton, IL (US);
Arthur A Pudark, Downers Grove, IL (US);
A. B. Dick Company, Chicago, IL (US);
Abstract
A mechanism for driving a computer form web along a predetermined path includes a ratchet wheel having two sets of oppositely facing teeth, mounted on a support shaft for rotation. The wheel is driven in both clockwise and counter-clockwise directions. A drive gear in meshing engagement with a plurality of gears for driving the sprocket mechanism transporting the computer form web is also mounted on the support shaft for rotation. The gear is joined to a coupling plate also mounted on the support shaft for rotation thereon. The coupling plate includes first and second pawls which extend therefrom for cooperative engagement with the ratchet teeth sets, respectively. Pawl actuator arms also mounted on the coupling plate are movable to first and second positions and when in a first position engage the pawls to maintain the latter out of engagement with respective ratchet teeth sets. Pawl actuator arm engaging levers are mounted adjacent the pawl actuator arms and are movable to first and second positions. When in the first position the levers engage the pawl actuator arms to maintain them in the first position. Movement of the lever arms to the second position permits the pawls to be moved toward the ratchet wheel. Control of movement of the lever arms in turn controls the number of revolutions of the drive gear and thus the extent of movement of the computer web along its path. A manually operated gear selector for providing a change in gear ratios controls the length of movement of the computer web for each revolution of the drive gear. Continual rotation of the drive gear can be achieved by maintaining the lever arms in the second position.