| 摘要 |
PROBLEM TO BE SOLVED: To provide a linear velocity difference absorbing system capable of absorbing liner velocity difference between a pair of carrier rollers with a simple structure. SOLUTION: For a sheet which is sandwiched by the pair of carrier rollers for conveyance, when conveyance speed (linear velocity), which is applied to the sheet by the pair of the carrier rollers, on a downstream side in the conveying direction is higher, tensional force works on a driving roller 112A on the upstream side in the conveying direction through the sheet based on the linear velocity difference. By action of the tensional force, the driving roller 112A rotates at a higher speed than the rotational speed (linear velocity) of a driving gear 120, and engagement protrusions 118A, 118B provided at the shaft end of a driving shaft 116 of the driving roller 112A separate from engagement protrusions 124A, 124B of the driving gear 120 which rotates in an arrow A direction (and moves in the arrow C direction). As a result, the driving roller 112A rotates at a speed corresponding to the conveyance speed (linear velocity) on the downstream side in the conveying direction. Thus, overload such as excessive extension of the sheet can be prevented from being applied to the sheet by absorbing the linear velocity difference. COPYRIGHT: (C)2003,JPO
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