| 摘要 |
The invention provides for an additional finger (5) engageable with a driver (7) of the rolling key (29), said finger (5) being located on an angularly movable bush (1). There is also provided a bearing ring (10) which is provided with a recess segment (17-18) into which the driver (7) extends. When said clutch actuating mechanism is disengaged with the drive motor at a standstill, the driver (7) takes up a position under spring-loading in which it bears against one edge (17) of said recess segment and sets the rolling key in its coupling position. Subsequent energisation of the drive motor will then only drive the shaft and the rolling key until the rolling key driver (7) comes to rest against the additional finger (5) of the bush (1). The rolling key is then turned back into its released position, without movement on the part of the machine. In that manner, accidents and breakdowns within the tooling area as referred to, are also avoided in the event of unauthorised actuation of the engagement/release arrangement. <IMAGE> |
