| 摘要 |
A conveying device for intermittently conveying a sheet through a platen press having a pair of endless chains with gripper bars extending therebetween, a drive shaft having drive sprockets engaging each of the pair of chains, at least one driven sprocket for each of the pair of chains, means including an oscillating sector gear for intermittently rotating the drive shaft characterized by at least one of the driven sprockets having an axial extension, braking means supported on a portion of the press frame adjacent each of the extensions for engaging the extension, means including at least one blower for cooling the braking means and means for actuating the braking means including a control shaft which is rotated one complete revolution for each cycle of oscillation of the sector gear and has means for causing the engagement and disengagement of the braking means during a portion of each revolution thereof. Preferably, the control shaft supports a disk-shaped programmer having an annular notch which is sensed by a magnetic sensing device that applies a signal to a valve which controls the selective application of pressure on the braking devices.
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