| 摘要 |
A tensioned cam surface operates a conveying device and is mounted concentrically with respect to a cammed program disk which carries timing gear teeth scanned by a time lever with which the conveying device can be locked or unlocked. Time metering apparatus is operated by at least one of the timing gear teeth on the continuously revolving cammed program disk and at the end operating position of the conveying device is reversed in direction. The time metering apparatus comprises a counter wheel rotatably mounted on a counter wheel lever and supported in a counting position by a front surface of the cammed program disk. The release of a cocking lever is simultaneous with a time when one of a number of special timing gear teeth engages with the counter wheel. The cocking lever is actuated by a time metering lever in the time metering apparatus and a locking latch locks the cocking lever in response to a timing cam mounted on the cammed program disk. The tension cam surface is shaped so that the unlocking of the cocking lever by the time metering lever is delayed and that delayed release is variable for any desired length of time either by a magnetically operated locking device or by a variation of the RPM of the main drive of the cammed program disk. |
