Clutches |
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| 申请号 | US47821074 | 申请日 | 1974-06-11 | 公开(公告)号 | US3905247A | 公开(公告)日 | 1975-09-16 |
| 申请人 | XEROX CORP; | 发明人 | COOK JOHN HAYWARD; | ||||
| 摘要 | A reproduction machine having a document scanning system has an improved recycling clutch for operating the system. The clutch has a rotatable input plate and a rotatable output plate. A pawl pivotally mounted on the input plate is biased into engagement with a notch on the output plate. A rotatable timing pulley driven by the input plate periodically contacts the pawl to disengage the latter from the output plate to effect release of the clutch at intervals greater than a revolution of the input plate. An arcuate ramp maintains the disengagement of the pawl from the output plate for a sufficient length of time to permit rotation of the latter in the reverse direction greater than one revolution via a biasing spring. | ||||||
| 权利要求 | 1. A reproduction machine having a document scanning system, and an improved means for operating the latter, said means comprising: a recycling clutch comprising rotatable input and output elements, cooperating drive engagement means on said elements respectively, one of which is pivotally mounted on its associated element and biased for engagement with the engagement means on the other element, a rotatable timing element adapted to be driven by said input element and arranged to come into engagement with said pivotally mounted engagement means to effect release of the clutch at intervals greater than a revolution of said input element, and means for maintaining said engagement means disengaged for a sufficient length of time to permit rotation of the output element in reverse direction under the influence of a biasing means through greater than one revolution. 2. A reproduction machine as claimed in claim 1, in which the input element includes a plate fixedly mounted on a drive shaft, and further including a pawl pivoted to said plate and biased to a position in which said pawl drivingly engages the output element. 3. A reproduction machine as claimed in claim 2, including a driving element for driving said timing element, said driving element being fixed against rotation with respect to the input element and adapted to engage said pawl once in each N revolutions, and wherein the ratio of the diameters of the timing and driving elements is N:1. 4. A reproduction machine as claimed in claim 2, and further including a ramp disposed so as to be contacted by said pawl when said clutch is to be held disengaged. 5. A recycling clutch comprising rotatable input and output elements, cooperating drive engagement means on said elements respectively, one of which is pivotally mounted on its associated element and biased for engagement with the engagement means on the other element, a rotatable timing element adapted to be driven by said input element and arranged to come into engagement with said pivotally mounted engagement means to effect release of the clutch at intervals greater than a revolution of said input element, and means for maintaining said engagement means disengaged for a sufficient length of time to permit rotation of the output element in reverse direction under the influence of a biasing means through greater than one revolution. |
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