Control knob clutches with lock
First Claim
Patent Images
1. In a reproduction machine having at least one adjustable operating component with a control element operable when rotated to adjust said component, the combination of:
- an internal clutch collar drivingly coupled to said control element, said clutch collar having a pair of discrete clutching surfaces;
an exterior control sleeve, said sleeve having a pair of clutching surfaces for engagement with one or the other of said collar clutching surfaces whereby to provide first and second clutches for coupling said sleeve through said clutch collar with said control element to permit said component to be adjusted by rotation of said sleeve;
means supporting said control sleeve for movement relative to said clutch collar for engaging one or the other of said first and second clutches selectively; and
locking means actuable to restrain relative movement between said control sleeve and said clutch collar and prevent engagement of either of said first and second clutches.
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Abstract
A control knob for permitting the service technician to adjust the operating level of a component in an electrostatic type reproduction machine with locking means effective to prevent unauthorized adjustments by others. To enable the machine user or operator, when training and experience warrants it, to perform service adjustments, the control knob incorporates an internal release mechanism, settable only by the machine service technician, permitting selected adjustment by the operator despite the locking means.
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Citations
7 Claims
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1. In a reproduction machine having at least one adjustable operating component with a control element operable when rotated to adjust said component, the combination of:
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an internal clutch collar drivingly coupled to said control element, said clutch collar having a pair of discrete clutching surfaces; an exterior control sleeve, said sleeve having a pair of clutching surfaces for engagement with one or the other of said collar clutching surfaces whereby to provide first and second clutches for coupling said sleeve through said clutch collar with said control element to permit said component to be adjusted by rotation of said sleeve; means supporting said control sleeve for movement relative to said clutch collar for engaging one or the other of said first and second clutches selectively; and locking means actuable to restrain relative movement between said control sleeve and said clutch collar and prevent engagement of either of said first and second clutches. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Control knob apparatus for adjusting a control shaft, comprising:
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an internal collar, said collar having first and second gear teeth at opposite ends thereof; means for non-rotatably securing said collar to said shaft; a sleeve having said collar received therewithin, said sleeve being movable axially relative to said collar and having first and second internal gear teeth for mating engagement with said collar first and second gear teeth on movement of said sleeve in one direction or the other, said gear teeth cooperating to form first and second clutches for rotatably coupling said sleeve with said control shaft; and an internal lock concealed within said sleeve to prevent movement of said sleeve to engage said first clutch; said sleeve including an external locking recess for receipt of an external locking member cooperable therewith to restrict axial movement of said sleeve and prevent accessing of said internal lock or engagement of said second clutch.
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Specification