Tensioning device
View Patent ↗The invention relates to a clamping device comprising a pivoting arm on which a clamping roll is rotatably arranged. In order to damp pivoting movements of the pivoting arm, a damping device is provided in the region of a pivoting axis X. Furthermore, the pivoting arm is supported by a tension spring device which ensures a frictional arrangement of the clamping roll on a traction mechanism, in the assembled state.
1. A tensioning device comprising:
(i) a bearing peg,
(ii) a pivoted arm mounted for pivoting on the bearing peg, and
(iii) a damping device for generating a frictional force that damps the pivoting motion of the pivoted arm about an axis of pivot defined by the bearing peg, said damping device comprising a friction surface member forming a friction surface that is seated on a counter-friction surface and produces a frictional force,
wherein the damping device further comprises:
(a) an entraining device, and
(b) a guide member engaged with the entraining device and supporting the friction surface member,
wherein the entraining device is coupled rotationally rigid to the bearing peg, and the guide member comprises a peripheral wall that is engaged with the entraining device to introduce the frictional force produced by the friction surface member into the bearing peg.
2. A tensioning device according to claim 1 , wherein the guide member is configured as a cup structure comprising a bottom opening that fringes the bearing peg.
3. A tensioning device according to claim 2 , wherein the bottom opening forms a peripheral wall that is engaged axially displaceable but rotationally fixed with an outer peripheral surface of the bearing peg.
4. A tensioning device according to claim 3 , wherein the bearing peg comprises an engagement structure that is engaged with said peripheral wall of the bottom opening.
5. A tensioning device according to claim 4 , wherein said engagement structure is configured as a knurling comprising a peripheral profile that permits axial displacement of the guide member but prevents rotation of the guide member relative to the bearing peg.
6. A tensioning device according to claim 2 , wherein the entraining device is configured as a bell-shaped element that engages over the cup structure.
7. A tensioning device according to claim 1 , wherein the friction surface member is an integral component of the guide member.
8. A tensioning device according to claim 1 , wherein the entraining device is configured as a disk element.
9. A tensioning device according to claim 8 , wherein an inner surface of the peripheral wall of the cup structure comprises an axial gearing that meshes with an outer gearing of the disk element.
10. A tensioning device according to claim 1 , wherein a spring device urges the friction surface member against the counter-friction surface.
11. A tensioning device according to claim 10 , wherein the spring device is an ondular washer.
12. A tensioning device according to claim 1 , wherein the counter-friction surface is formed by an end surface section of the pivoted arm fringing the bearing peg.
13. A tensioning device according to claim 12 , wherein the counter-friction surface is formed by a circumferential groove of V-shaped cross-section that is seated in said end surface section.
14. A tensioning device according to claim 13 , wherein the friction surface member is configured as a tapered ring and seated in the circumferential groove.
15. A tensioning device according to claim 1 , wherein the pivoted arm is mounted through a first sliding bearing ring and a second sliding bearing ring, and said first and second bearing rings are spaced from each other in the direction of the axis of pivot.