Retention device with crank transmission
The invention relates to a retention device comprising a support bracket that can be moved along a filling tube, for accommodating a brake ring clasped around the filling tube to exercise a frictional force on a tubular casing to be pulled off the filling tube during filling, and further comprising a drive coupled to the support bracket for moving the support bracket back and forth parallel to the filling tube. The drive comprises a crank transmission with a crank that is connected on the driven side to the support bracket.
1. A retention device comprising:
a support bracket that can be moved along a filling tube, and a brake ring supported by the support bracket and clasped around the filling tube to exercise a frictional force on a tubular casing to be pulled off the filling tube during filling, and
further comprising a rotary drive coupled to the support bracket for moving the support bracket and brake ring back and forth parallel to the filling tube,
the drive comprising a crank transmission with a rotatable crank connected on a driven side to the support bracket.
2. The device of claim 1 , wherein the retention device comprises a work storage device and a retarder disposed downstream therefrom in the direction of power transmission in order to stop the support bracket at a stopping point.
3. The device of claim 2 , wherein the retarder is configured to act on the crank or on a driven shaft connected to the crank in order to stop the crank at said stopping point.
4. The device of claim 3 , wherein the retarder is configured to be adjustable in its position relative to the crank, such that the angular position of the crank at the stopping point can be varied.
5. The device of claim 3 , wherein the work storage device comprises a torque-resistant spring element coupling the driven shaft to a drive shaft.
6. The device of claim 5 , wherein the spring element is biased against the drive direction.
7. The device of claim 5 , wherein the retarder and the drive shaft communicate by means of a cam curve control configured to terminate the action of the retarder on the crank or the driven shaft.
8. The device of claim 5 , wherein the drive has a safety clutch.
9. The device of claim 8 , wherein the safety clutch comprises a clutch plate which connects the drive shaft to the spring element.
10. The device of claim 9 , wherein the spring element is configured as a helical compression spring that presses the clutch plate axially against the drive shaft.
11. The device of claim 10 , wherein the drive shaft includes an entrainment element that engages a corresponding entrainment element of the clutch plate, wherein said engagement of the entrainment element can be terminated at a specific relative angular position of the drive shaft and the driven shaft.
12. The device of claim 11 , wherein the clutch plate and the driven shaft communicate by means of a cam curve control configured to move the clutch plate axially against a pressure exerted by the spring during relative rotation of the drive shaft and the driven shaft, thereby terminating the engagement of the entrainment elements of the drive shaft and the clutch plate at the specific relative angular position.
13. The device of claim 5 further comprising:
a connecting flange with a stub shaft that can be connected to a drive motor of a clipping device, on the one hand, and to the drive, on the other hand.
14. The device of claim 13 , wherein the retention device has a drive motor coupled to the drive, and an electronic controller with a control input that can be coupled to a control interface of the clipping device.
15. The device of claim 1 , further comprising:
a linear drive coupled to the support bracket and configured to drive the support bracket from its forward position of the back-and-forth movement, in the pull-off direction, further in the pull-off direction into a free-running position in which the brake ring is pulled off the filling tube, and back into the forward position.
16. The device of claim 15 , wherein the crank comprises a linear guide on a carriage of which a pin of the crank is disposed for movement between a position corresponding to the forward position and the free-running position of the support bracket.
17. The device of claim 15 further comprising:
a retention means disposed upstream from the support bracket for restraining a supply of casing located on the filling tube.
18. The device of claim 17 , wherein the linear drive is coupled with the retention means.
19. The device of claim 1 , wherein the crank is connected by means of a connecting rod to the support bracket.
20. A retention device for a filling machine having a filling tube for filling a tubular casing, wherein at least a portion of the casing is stored as needed in a bunched up accordion fashion about the filling tube, the retention device comprising:
a support bracket;
a brake ring mounted on the support bracket, the brake ring being clasped around the filling tube to selectively exercise a frictional force on the tubular casing during filling;
a rotary drive coupled to the support bracket for moving the support bracket and brake ring mounted thereon back and forth, parallel to the filling tube;
the drive comprising a crank transmission including a rotatable crank connected to the support bracket.