Film transport device for a packaging machine for packaging with stretch film

Patent metadata

Field	Value
Publication number	US-10737895-B2
Application number	US-201916398275-A
Country	US
Kind code	B2
Filing date	Apr 30, 2019
Priority date	Jun 25, 2018
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

A film transport device for transporting a stretchable film includes: at least one belt conveyor, the belt conveyor having two opposing transport belts for transporting the film and a first and a second deflection roller, each of which guides one of the transport belts in continuous circulation and is arranged at an end in a respective transport belt. An end portion of the first deflection roller projects past an associated transport belt, the first deflection roller having a first transport ring at the end portion along its periphery. An end portion of the second deflection roller projects past an associated transport belt, the second deflection roller at the end portion along its periphery having a second transport ring. A first contact surface of the first transport ring extends with mechanical friction along a circumference of the first deflection roller.

First claim

What is claimed is:

1. A film transport device for transporting a stretchable film, comprising:
at least one belt conveyor, the belt conveyor having two opposing transport belts configured to transport the film and a first and a second deflection roller, each of which is configured to guide one of the transport belts in continuous circulation and is arranged at an end in a respective transport belt,
wherein an end portion of the first deflection roller projects past an associated transport belt, the first deflection roller having a first transport ring at the end portion along its periphery,
wherein an end portion of the second deflection roller projects past an associated transport belt, the second deflection roller at the end portion along its periphery having a second transport ring, and
wherein a first contact surface of the first transport ring extends with mechanical friction along a circumference of the first deflection roller, a second contact surface of the second transport ring extends with mechanical friction along a circumference of the second deflection roller, and the contact surfaces abut with frictional engagement.

2. The film transport device according to claim 1 , wherein the transport rings comprise elastically deformable material comprising a rubber-elastic material.

3. The film transport device according to claim 2 , wherein the transport rings, in a condition where they have frictional engagement with one another at the contact surfaces, have a flat portion situated radially to an inside compared to a remaining surface of the transport rings.

4. The film transport device according to claim 1 , wherein at least one end portion of the first deflection roller and/or the second deflection roller comprises a transport ring.

5. The film transport device according to claim 1 , wherein at least the end portion of the first deflection roller and/or the second deflection roller has a plurality of transport rings of the end portion, the plurality of transport rings comprising two transport rings of the end portion.

6. The film transport device according to claim 1 , wherein the transport rings are comprised of a same material.

7. The film transport device according to claim 1 , wherein a further end portion of the first deflection roller that is opposite the end portion of the first deflection roller projects past the transport belt arranged thereon, and has a third transport ring at an other end portion along a circumference of the first deflection roller, and/or
wherein a further end portion of the second deflection roller that is opposite the end portion of the second deflection roller projects past the transport belt arranged thereon and has a fourth transport ring, at an other end portion, that projects along a circumference of the second deflection roller, the third and fourth transport rings abutting flat with frictional engagement.

8. The film transport device according to claim 1 , wherein at least one deflection roller has a gear wheel for a drive by a gear drive unit, a washer being arranged between the transport ring of the deflection roller and the gear wheel.

9. The film transport device according to claim 1 , wherein the transport rings are fastened to associated deflection rollers by bolts and/or screws.

10. The film transport device according to claim 1 , wherein the deflection rollers each have a layered structure, a first layer comprising a gear wheel with a ball bearing, a second layer comprising a first washer arranged on the gear, a third layer comprising a transport ring comprising a rubber ring, arranged on the first washer, a fourth layer comprising a second washer which is arranged on the transport ring, and the layers being secured to each other by screws.

11. The film transport device according to claim 10 , wherein the screws comprise bolts having an unthreaded section.

12. The film transport device according to claim 11 , wherein the layer structure has through-holes for insertion of the bolts which are fastened on an other side by counter nuts.

13. A packaging machine for packaging products to be packaged by a stretchable film, comprising:
the film transport device according to claim 1 .

Assignees

• Bizerba Se & Co Kg

Inventors

• Heller Franz
• Kirsch Sascha

Classifications

• B65B11/54

  Wrapping by causing the wrapper to embrace one end and all sides of the contents, and closing the wrapper onto the opposite end by forming regular or irregular pleats · CPC title

• B65H20/06 Primary

  by friction band · CPC title

• B65B41/12 Primary

  Feeding webs from rolls · CPC title