| 摘要 |
<p>PURPOSE:To absorb the fluctuation in a rotation speed of a pulse motor and to perform stable conveyance of a sheet by providing a coupling part to transmit the rotation force of the pulse motor through a resilient body to a drive roller and a fly wheel located on the roller side. CONSTITUTION:A shaft 21 of a pulse motor 20 is coupled directly to a shaft 31 of a coupling part 30 not through a reduction mechanism but through a coupling 22. Rotation of the shaft 31, i.e., rotation of the pulse motor 20, is transmitted within the coupling part 30 to a shaft 33 on the drive roller 2 side through two 0-rings 32a and 32b made of rubber. A fly wheel 40 is located between the shaft 33 and the drive roller 2, and the shaft 33, the fly wheel 40, and the drive roller 2 are fixed in a manner to be integrally rotated. This constitution absorbs the fluctuation in a rotation speed of the pulse motor 20 by the effect produced by both of a resilient body and the fly wheel 40 and suppresses the fluctuation in a rotation speed of the drive roller 2 to the rotation speed low enough within an allowable range.</p> |
