Claims
- 1. A method for threading the end of a web from a jumbo roll or the like along a selected path through a web processing arrangement, comprising:
- (a) grasping the end of the web on the roll,
- (b) transferring the end of the web by a fetching and grasping device to a position such that the web extends adjacent a web holding device,
- (c) holding the web by the web holding device,
- (d) detaching the web from the fetching and grasping device, attaching the web to a threading member, and releasing the web from the web holding device, and
- (e) advancing the threading member along the selected path.
- 2. A method according to claim 1, comprising, in step (c), holding the web by the web holding device at a location spaced apart along the web from the end of the web.
- 3. A method according to claim 2, wherein the step of detaching the web from the fetching and grasping device comprises cutting the web between said location and the end of the web, whereby a new web end is formed.
- 4. A method according to claim 3, wherein the step of attaching the web to the threading member is performed after cutting the web.
- 5. A method according to claim 1, wherein step (a) comprises grasping the end of the web by suction.
- 6. A method according to claim 1, wherein step (c) comprises holding the web by suction.
- 7. A method according to claim 1, wherein step (c) comprises holding the web by gripping.
- 8. Apparatus for threading the end of a web from a jumbo roll or the like along a selected path through a web processing arrangement, comprising:
- a web holding device operative selectively to hold the web or release the web,
- a fetching and grasping device for grasping the end of the web on the roll,
- transfer means for causing the fetching and grasping device to transfer the end of the web to a position such that the web extends adjacent the web holding device, so that the web holding device may be operated to hold the web,
- a threading member,
- means for advancing the threading member along the selected path, and
- means for attaching the threading member to the web when it is held by the web holding device, so that when the web holding device is operated to release the web and the threading member is advanced, the web is threaded through the web processing arrangement as a single thickness and the web is unwound from the jumbo roll.
- 9. Apparatus according to claim 8, wherein the fetching and grasping device comprises an arm that is pivotally mounted with respect to the jumbo roll, and a suction roll supported by the arm, and the transfer means comprise an actuator member which acts upon the arm to move the suction roll along a predetermined path of movement towards and away from the jumbo roll.
- 10. Apparatus according to claim 8, wherein the web holding device comprises a suction roll.
- 11. Apparatus according to claim 10, comprising an arm that is pivotable relative to the suction roll, and a beam that is attached to the arm for pivotal movement relative to the suction roll.
- 12. Apparatus according to claim 8, wherein the web holding device comprises first and second press members for gripping the web therebetween.
- 13. Apparatus according to claim 12, wherein the first press member is stationary with respect to translation relative to the jumbo roll, and the apparatus comprises an arm that is pivotable relative to the first press member, and the second press member is attached to the arm for pivotal movement relative to the first press member.
- 14. Apparatus according to claim 12, wherein the first press member is a suction member and the second press member is a beam.
- 15. Apparatus according to claim 8, wherein the web holding device comprises a beam having a suction plane.
- 16. Apparatus according to claim 15, comprising an arm that is pivotable relative to the beam, and a second beam that is attached to the arm for pivotal movement relative to the first-mentioned beam.
- 17. Apparatus according to claim 16, wherein the second beam has a suction plane.
- 18. Apparatus according to claim 8, comprising a blade attached to the web holding device for cutting the web at a position on the opposite side of the web holding device from the jumbo roll.
- 19. Apparatus according to claim 8, wherein the means for advancing the threading member comprise a carrier device for guiding the threading member along said selected path.
- 20. Apparatus according to claim 19, wherein the carrier device comprises chains on which the threading member is fitted.
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 872222 |
May 1987 |
FIX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/398,327 filed Aug. 27, 1989 and now abandoned, which is a continuation of application Ser. No. 07/194,470 filed May 16, 1988 and now abandoned.
The invention concerns a method for threading the end of a web from a jumbo roll or equivalent through the winder along a path determined by the members guiding the web, in which said method the end of the web is passed from the jumbo roll through the winder at full width by grasping the end of the web on the jumbo roll by means of a fetching and grasping device.
The invention also concerns a device for threading the end of a web from a jumbo roll or equivalent through the winder along a path determined by the members guiding the web, which said device includes a fetching and grasping device, which is fitted so as to grasp the end of the web on the jumbo roll.
At present, the threading of the end of the web is carried out so that the end of the web is torn to a wedge-shaped form and is passed by means of the threading equipment through the winder, e.g. in a carrier-drum slitter-winder, onto the carrier drums. Thereupon the wedge-shaped end of the web is removed, and the slit component webs are wound around paper cores in known manner art before the winding is started. It is a drawback of this method that the threading of the web is very slow and, as a rule, requires 2 or 3 workers, because the end of the web must first be torn to a wedge-shaped form, the creeping of the winder device, such as, e.g., a slitter-winder, is slow, and the removal of the wedge-shaped end takes time. Moreover, the prior-art method requires air blowers, belts, etc. as auxiliary equipment for the threading of the web.
In the Finnish Patent No. 69,439, a method and a device are described for threading the end of a web from a jumbo roll or equivalent through the winder along a path determined by the members guiding the web. In this prior-art solution, the end of the web is passed from the jumbo roll through the winder at full width by grasping the end of the web placed on the jumbo roll and winding the web around a fetching and grasping device for a desired number of revolutions, whereupon the web is passed through the winder in doubled over fashion so that web is unwound at the same time both from the jumbo roll and from the fetching and grasping device.
Among other things, a drawback of the method and the device in accordance with the Finnish Patent No. 69,439 is that the bottom layers formed on the paper core constitute material unsuitable for printing, for which reason the roll cannot be unwound completely to the end. This causes a certain loss of material. Moreover, this prior-art method and device require a relatively complicated solution of equipment, because the web must be passed through the winder as two-fold.
The object of the invention is to provide an improvement of the methods known in prior art and, above all, to improve the method of the Finnish Patent No. 69,439. A more specific object of the invention is to provide a method wherein the threading of the end of the web can be made faster while, at the same time, reducing the number of components in the equipment needed for the threading.
The objectives of the invention are achieved by means of a method which is mainly characterized in that the web is transferred by means of the fetching and grasping device to a web holding device, the web is held by means of the web holding device, the web is detached from the fetching and grasping device, the web is attached to a threading member carried by a carrier device, the web is detached from the web holding device, and the web is threaded as a single thickness through the winder, whereat the web is unwound from the jumbo roll.
A further object of the invention is to provide an improvement of the devices known in prior art. On the other hand, the device in accordance with the invention is mainly characterized in that the device includes a web holding device, which is fitted so as to receive the web transferred by the fetching and grasping device and to hold the web, and a threading member carried by a carrier device, which is fitted so as to thread the web as a single thickness through the winder, whereat web is unwound from the jumbo roll.
By means of the method and the device in accordance with the invention, a number of remarkable advantages are obtained. The end of the web does not have to be torn to wedge-shaped form, whereby the threading of the web at full width makes the threading considerably faster. Also, the method and the device of the invention make the threading of the web faster because the slow tearing off of the wedge-shaped end of the web is avoided. Likewise, the auxiliary equipment for threading, such as air blowers and belts, can be omitted. Also, the method and the device of the invention permit threading of the web by one worker alone and, yet, relatively rapidly. The method and the device of the invention also produce economies of material, because no paper broke is formed.
The most highly recommended fields of application of the method and the device of the invention are winders in which the time of threading of the web is long and which require a great deal of labour, such as coating machines, calenders, and slitter-winders. The method of the invention can be applied both when running the upper way and when running the lower way.
The invention will be described in detail with reference to some preferred embodiments of the invention illustrated in the figures in the accompanying drawings, whereat the invention is, however, not to be confined to said embodiments alone.
US Referenced Citations (3)
| Number |
Name |
Date |
Kind |
|
4444360 |
Kaipf et al. |
Apr 1984 |
|
|
4491503 |
Adams et al. |
Jan 1985 |
|
|
4637566 |
Kyytsonen |
Jan 1987 |
|
Continuations (2)
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Number |
Date |
Country |
| Parent |
398327 |
Aug 1989 |
|
| Parent |
194470 |
May 1988 |
|
Patent Grant
5016831
