Machine for cutting logs with grinding wheels and method

Patent metadata

Field	Value
Publication number	US-10647015-B2
Application number	US-201515507112-A
Country	US
Kind code	B2
Filing date	Jul 30, 2015
Priority date	Aug 29, 2014
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

The machine includes a feeding path for the logs to be cut and a cutting head arranged along the feeding path. The cutting head includes a coupling for a disc-shaped cutting blade and is designed to impart the disc-shaped cutting blade a rotary motion around the axis thereof and a cyclic movement to cut the logs into single rolls, and to allow the logs to move forward along the feeding path. The machine also includes at least a grinding unit, including at least one grinding wheel mounted onto a rotation shaft and co-acting with a side of the disc-shaped cutting blade to grind the cutting edge of the same disc-shaped cutting blade. A controlled approach system is also provided to move the grinding wheel towards the disc-shaped cutting blade.

First claim

The invention claimed is:

1. A machine for cutting logs of web material comprising:
a feeding path for logs to be cut;
a cutting head arranged along the feeding path, which comprises a coupling for a disc-shaped cutting blade and is adapted to impart the disc-shaped cutting blade a rotary motion around an axis thereof and a cyclic movement to cut the logs into single rolls, and to allow the logs to move forward along the feeding path;
a grinding unit comprising at least one grinding wheel mounted onto a rotation shaft and co-acting with a side of the disc-shaped cutting blade to grind a cutting edge of the disc-shaped cutting blade;
a controlled approach system to move the at least one grinding wheel towards the disc-shaped cutting blade and automatically adjust position of the at least one grinding wheel with respect to the disc-shaped cutting blade, said controlled approach system comprising one or more resilient members adapted to provide controlled approach movement towards the cutting blade;
wherein the at least one grinding wheel and the controlled approach system are mounted on a slide that is carried by the cutting head and said slide is provided with a movement towards and away from the coupling of the cutting blade to selectively bring the at least one grinding wheel in grinding contact with the disc-shaped cutting blade and out of contact with the disc-shaped cutting blade, the movement being automatically adjusted to compensate for wear of the disc-shaped cutting blade caused by grinding; wherein when the disc-shaped cutting blade is worn out, a locking member is activated to prevent the one or more resilient members from acting on said at least one grinding wheel and the slide is adapted to position the at least one grinding wheel in a nominal non-touching position with respect to the worn out disc-shaped cutting blade as a new disc-shaped cutting blade is arranged on said cutting head to replace the worn out disc-shaped cutting blade and when the new disc-shaped cutting blade is arranged on the cutting head, the locking member is deactivated; and wherein the controlled approach system of the at least one grinding wheel is adapted to adjust the position of the at least one grinding wheel with respect to the disc-shaped cutting blade, by moving the at least one grinding wheel in an approach direction with respect to the slide from the nominal non-touching position towards the disc-shaped cutting blade such that the at least one grinding wheel is in a position to act with pressure against a respective side of the cutting edge of the disc-shaped cutting blade.

2. The machine according to claim 1 , wherein the controlled approach system is configured to move the at least one grinding wheel according to a direction substantially parallel to the axis of the rotation shaft of the at least one grinding wheel.

3. The machine according to claim 1 , wherein the controlled approach system comprises an actuator arranged to move the at least one grinding wheel axially.

4. The machine according to claim 2 , wherein the controlled approach system comprises an actuator arranged to move the at least one grinding wheel axially.

5. The machine according to claim 3 , wherein said actuator comprises an electric motor.

6. The machine according to claim 4 , wherein said actuator comprises an electric motor.

7. The machine according to claim 1 , wherein the slide is configured and adapted to move in a direction different from a controlled approach direction of the at least one grinding wheel to the disc-shaped cutting blade.

8. The machine according to claim 2 , wherein the slide is configured and adapted to move in a direction different from a controlled approach direction of the at least one grinding wheel to the disc-shaped cutting blade.

9. The machine according to claim 1 , wherein the controlled approach system further comprises:
a support, inside which the rotation shaft of the at least one grinding wheel is supported, the rotation shaft being axially fixed to the support and the support being axially movable inside a housing;
a translation mechanism for translating the support with respect to the housing, in a direction parallel to an axis of the rotation shaft.

10. The machine according to claim 9 , wherein the housing is stationarily mounted on the slide.

11. The machine according to claim 9 , wherein the translation mechanism comprises the locking member to lock the support axially with respect to the housing, and the one or more resilient members generate a thrust onto the support with respect to the housing, in a direction substantially parallel to the axis of the respective shaft.

12. The machine according to claim 9 , wherein the translation mechanism comprises an actuator configured to translate the support parallel to the axis of the rotation shaft.

13. The machine according to claim 1 , wherein the at least one grinding unit comprises a second grinding wheel provided with a second controlled approach system to move the second grinding wheel towards the disc-shaped cutting blade.

14. A machine for cutting logs of web material comprising:
a feeding path for logs to be cut;
a cutting head arranged along the feeding path, which comprises a coupling for a disc-shaped cutting blade and is adapted to impart the disc-shaped cutting blade a rotary motion around an axis thereof and a cyclic movement to cut the logs into single rolls, and to allow the logs to move forward along the feeding path;
a grinding unit comprising at least one grinding wheel mounted onto a rotation shaft and co-acting with a side of the disc-shaped cutting blade to grind a cutting edge of the disc-shaped cutting blade;
a controlled approach system to move the at least one grinding wheel towards the disc-shaped cutting blade and automatically adjust position of the at least one grinding wheel with respect to the disc-shaped cutting blade, said controlled approach system comprising a detection member adapted to sense position of said at least one grinding wheel;
a support, inside which the rotation shaft of the at least one grinding wheel is supported, the rotation shaft being axially fixed to the support and the support being axially movable inside a housing; and an actuator configured to translate the support with respect to the housing in a direction parallel to an axis of the rotation shaft;
wherein the at least one grinding wheel and the controlled approach system are mounted on a slide that is carried by the cutting head and said slide is provided with a movement towards and away from the coupling of the cutting blade to selectively bring the at least one grinding wheel in grinding contact with the disc-shaped cutting blade and out of contact with the disc-shaped cutting blade, the movement being automatically adjusted to compensate for wear of the disc-shaped cutting blade caused by grinding; wherein when the disc-shaped cutting blade is worn out the slide is adapted to position the at least one grinding wheel in a nominal non-touching position with respect to the worn out disc-shaped cutting blade as a new disc-shaped cutting blade is arranged on said cutting head to replace the worn out disc-shaped cutting blade and when the new disc-shaped cutting blade is arranged on the cutting head, the controlled approach system of the at least one grinding wheel is adapted to adjust the position of the at least one grinding wheel with respect to the disc-shaped cutting blade, by moving the at least one grinding wheel in an approach direction with respect to the slide from the nominal non-touching position towards the disc-shaped cutting blade such that the at least one grindi

Assignees

• Perini Fabio Spa

Inventors

• Mazzaccherini Graziano
• Montagnani Franco

Classifications

• B26D2210/11

  for cutting web rolls · CPC title

• B26D3/16

  Cutting rods or tubes transversely {(cutting tubes longitudinally B26D3/001)} · CPC title

• B26D1/16 Primary

  mounted on a movable arm or the like · CPC title

• B26D5/22

  having the cutting member and work feed mechanically connected · CPC title

• B24B3/46

  of disc blades · CPC title