Patent ID: 8276904
Filing Date: 2012-10-02
Classification: B65H

Abstract:
1. A sheet pick-up module of an automatic document feeder for feeding a document into said automatic document feeder, said automatic document feeder comprising a feed roller, said sheet pick-up module comprising: a driving shaft; a driving shaft sleeve fixedly disposed on said driving shaft, and synchronously rotated with said driving shaft wherein said driving shaft sleeve has a driving slant and a driving bulge, wherein when said driving shaft is driven to rotate and said driving shaft sleeve is synchronously rotated with said driving shaft, said driving slant pushes said sliding bulge to have said sliding bulge move toward said pick-up roller sleeve, and said driving bulge pushes said sliding bulge to have said sliding bulge rotate, so that said sliding stopper pushes said pick-up stopper to have said pick-up driving roller rotate to transport said document, wherein when said document is transported by said feed roller at said feed speed, said document is contacted with said pick-up driving roller to drive rotation of said pick-up driving roller, said pick-up roller sleeve is synchronously rotated with said pick-up driving roller, and said pick-up slant pushes said sliding sleeve to have said sliding sleeve move in a direction away from said pick-up roller sleeve; a pick-up driving roller disposed on said driving shaft, wherein said pick-up driving roller is not synchronously rotated with said driving shaft, wherein said pick-up driving roller is contacted with said document to transport said document, wherein said pick-up driving roller has a pick-up roller sleeve arranged beside said pick-up driving roller, and synchronously rotated with said pick-up driving roller and wherein said pick-up roller sleeve has a pick-up slant, a first included angle is defined between said pick-up slant and said driving shaft, and said pick-up slant is extended along said driving shaft in a direction away from said pick-up driving roller, thereby defining a pick-up stopper parallel with said driving shaft, wherein said sliding sleeve has a sliding bulge and a sliding slant, said sliding bulge is arranged at a first end of said sliding sleeve, said sliding slant is arranged at a second end of said sliding sleeve, a second included angle is defined between said sliding slant and said driving shaft, and said sliding slant is extended along said driving shaft in a direction toward said pick-up driving roller, thereby defining a sliding stopper parallel with said driving shaft, wherein said sliding slant and said pick-up slant are complementary to each other, and said sliding stopper and said pick-up stopper are complementary to each other; a sliding sleeve surrounding said pick-up driving roller, slidable with respect to said pick-up roller sleeve, and separated from said driving shaft, wherein when said driving shaft is rotated to drive rotation of said driving shaft sleeve, said driving shaft sleeve pushes said sliding sleeve to have said sliding sleeve move toward said pick-up roller sleeve, and said sliding sleeve is rotated to push said pick-up roller sleeve, so that said pick-up driving roller and said pick-up roller sleeve are synchronously rotated to transport said document at a pick-up speed, wherein when said feed roller is contacted with said document to transport said document at a feed speed faster than said pick-up speed, said pick-up driving roller is driven to rotate by said document, and said pick-up roller sleeve is rotate to push said sliding sleeve, so that said sliding sleeve is moved in a direction away from said pick-up roller sleeve; wherein said automatic document feeder further comprises: a power device for providing a driving force; a feed shaft penetrating through said feed roller for driving rotation of said feed roller; and a gear set connected with said power device, said driving shaft and said feed shaft for receiving said driving force from said power device, and transmitting said driving force to said driving shaft and said feed shaft; wherein said gear set comprises: