CA2044066C

CA2044066C - Cutting device for a web winder

Info

Publication number: CA2044066C
Application number: CA 2044066
Authority: CA
Inventors: Vesa Raudaskoski
Original assignee: Valmet Paper Machinery Inc
Current assignee: Valmet Paper Machinery Inc
Priority date: 1990-06-08
Filing date: 1991-06-07
Publication date: 1994-11-08
Anticipated expiration: 2011-06-07
Also published as: EP0460395B1; FI902890A0; DE69111517T2; CA2044066A1; FI902890A; EP0460395A1; FI94514C; JPH04226247A; JP2515633B2; DE69111517D1; FI94514B

Abstract

The invention relates to a cutting device for a web winder.
The cutting device includes a frame construction and a cutting blade, by means of which cutting blade the web in a reel formed on support of carrier drums can be cut off before new winding is started. The cutting device preferably includes an actuator and power transfer members which are operationally connected with the cutting blade of the cutting device. In this manner, the movement of the actuator is transferred by an intermediate of the power transfer members to the cutting blade so that the cutting blade moves along a curved path. The cutting blade is thereby movable between a lower position and an upper position, the cutting blade in its lower position being substantially more distant from the carrier drum than in its upper position.

Description

20~40 6~

CUTTING DEVICE FOR A WEB WINDER

Field of the Invention The invention relates to a cutting device for a web winder.
The device comprises a frame construction and a cutting blade, by means of which cutting blade the web in the reel formed on support of the carrier drums can be cut off before new winding is started.

Backqround of the Invention In FI Patent No. 75,788, a method and a device for winding of a material web are described. This prior art carrier-drum winder comprises a rear and a front carrier drum, web cutting means, pushing means for the transfer of a complete reel from the carrier drums, and means for feeding a new reeling spool. The cutting means and the feeding means are operationally connected with the pushing means so as to be displaced to their operation positions by means of a common support arm. One end of the support arm is moun-ted rotatably at a pivot point placed in the area of the central axis of the real carrier drum, and the pushllly r,eans are attached rotatably to the opposite end of the support arm so that the path of movement of the pushing means is provided by displacing the support arm towards the front carrier drum. The rotation of the pushing means in relation to their support point is accomplished by means of joint operation of the support rolls provided in the pushing means and support faces placed at the sides of the winder.
In view of supporting and holding the web during the reel exchange, the carrier-drum winder includes a backup holder, which is pushed to project between the carrier drums and which holds the ~k 20~40~6-web against the rear carrier drum. The cutting means include a member for cutting off the web by means of a stroke-like movement of the cutting blade. The stroke-like movement is directed at the area of the tip of the backup holder, towards the web portion placed between and is held tight by the tip and the pushing means.
A drawback of the web cutting device disclosed in FI Patent N.
75,788 is that a large number of beams are required for which reason the frame construction of the cutting device is complicated and heavy.
In publication DE 2,920,707, a combined web holder and cutting device is described, which is fitted underneath the carrier- drum winder. This arrangement requires that a recess must be made into the floor of the production plant for the frame of the cutting device. Thus, this solution requires an abundance of space under-neath the carrier-drum winder. The cutting proper of the web takes place by displacing the blade of the cutting device.
Summary of the Invention In view of the above, an object of the present invention is to provide an improvement over the prior art web cutting devices.
More particuldrly ~ it is an obJ ect of the in~ention ~o p-r-o-vide a cutting device which does not require an installation pit in the floor of the production plant.
A further object of the invention is to provide a cutting de-vice which can be attached to the frame of any carrier-drum winder whatsoever.
These objects and others are achieved in the present invention by means of a cutting device whlch comprises a cutting blade, an actuator and power transfer members which are operationally con-nected with the cutting blade so that the movement of the actuator is transferred by an intermediate of said power transfer members to the cutting blade. The cutting blade moves along a curved path of movement so that a lower position of the cutting blade is substan-tially more distant from an associated carrier drum than in an upper position of the cutting blade.
By means of the cutting device in accordance with the inven-tion, a number of remarkable and unexpected advantages are ob-tained. By means of the cutting device of the present invention, it is unnecessary to make an installation pit for the frame construction of the cutting device in the floor of the production plant. The cutting device can be attached to the frame of any carrier-drum winder whatsoever. The cutting blade of the cutting device can be passed into the gap between the carrier rolls either from below, from the front, from the rear, or from above. Further-more, it is easily possible to attach other auxiliary devices to the cutting device, that are necessary for carrying out the reel exchange. Such auxiliary devices are, for example, a blow device for holding the end of the cut-off web, a web holding device, and a threading member, etc.

B~IEF DESCKI2TIGN GF THr ~RA-wINGS
The following drawings are illustrative of embodiments of the present invention and are not meant to limit the scope of the invention as encompassed by the claims.

Figure 1 is a side view of a preferred embodiment of a cutting device in accordance with the invention.

Figure 2 is a side view of a second preferred embodiment of a cutting device in accordance with the invention.

Figure 3 is a side view of a third preferred embodiment of a cutting device in accordance with the invention.

Figure 4 is a side view of a fourth preferred embodiment of a cutting device in accordance with the invention.

Figure 5 is a side view of a fifth preferred embodiment of a cutting device in accordance with the invention.

DETAILED DESCRIPTION
In the embodiment shown in Fig. 1, the cutting device in accordance with the invention denoted generally with the reference numeral 10. The cutting device 10 comprises a frame 11, a syn-chronization tube 12, first arms 13 that are fitted pivotally, second arms 14 that are fitted pivotally, a cutting-blade frame 15 and a cutting blade 16, as well as an actuator 17. The frame tube, which is a part of the frame 11, is denoted with the reference numeral lla. The frame tube lla passes in a transverse direction through the carrier-drum winder to an opposite side. In the e-mbodiment shown in rig. l, the cutting device lû is appiied in a carrier-drum winder which comprises a conventional carrier drum 18 as well as a carrier drum 19 consisting of a roll l9a and of another roll, not shown, and of a belt l9b. The reel is denoted with the reference numeral 2û.
In the embodiment shown in Fig. l, the cutting blade 16 of the cutting device lû is passed into the gap between the carrier drums 18 and 19 from below. The cutting device lû is attached to the frame construction.

The cutting device 10 shown in Fig. 1 operates as follows. The movement of the actuator 17, e.g. a hydraulic cylinder, acts upon the first arms 13, which are linked with the second arms 14. The pivoting movement of the arms 13 is synchronized by means of the synchronization tube 12. The frame 15 of the cutting blade 16 is linked with the second arms 14. The movement of the actuator 17 is transferred to the frame 15 by the intermediate of the arms 13 and 14, whereby the frame 15 of the cutting blade and the cutting blade 16, which is attached to the frame, obtain a curved movement of rotation in relation to the face of the carrier drum 18. This cur-ved movement of rotation has been chosen so that the center of rotation of the cutting blade 16 is separate from the center of rotation of the carrier drum 18. The center of rotation of the blade 16 can be chosen fully freely, provided that the center of rotation of the blade 16 does not coincide with the center of rotation of the carrier-drum 18.
In Fig. 1, the dashed lines indicate the lower position of the cutting blade 16 and, in a corresponding way, the full lines indicate the upper position. It is readily apparent from Fig. 1 that ill its iOW~l positivl., ~h~ cut.in~ blad~ i6 is piac~d a~ a certain distance from the face of the carrier drum 18, and in its upper position the cutting blade 16 is placed very close to the face of the carrier drum 18.
The cutting proper of the web takes place, e.g., merely because the blade 16 is sharp enough to pass through the web that is placed tensioned on the reel 20. The cutting of the web placed on the reel 20 may also take place so that the reel 20 is pushed by means of a pushing device in itself known, in which case the ten-sioned web forms a sufficient angle in relation to the cutting blade 16, whereby the web is cut off.

204406~i The embodiment shown in Fig. 2 illustrates the passing of the cutting device 10 in accordance with the invention into the gap between the carrier drums 18 and 19 from the side, or, as depicted in the present embodiment from the rear. In this embodiment, the carrier-drum winder comprises conventional carrier drums 18 and 19.
In the embodiment shown in Fig. 3, the passing of the cutting device 10 takes place similarly to Fig. 1, i.e., from below. In this embodiment, the carrier-drum winder is composed of conven-tional carrier drums 18 and 19. Further, in this embodiment, the cutting device 10 is provided with a blow device 21.
The embodiment shown in Fig. 4 is similar to the embodiment shown in Fig. 1, except that the cutting device 10 shown in Fig. 4 is provided both with a blow device 21 and with a web holder 22.
Fig. 5 shows an embodiment which is in the other respects similar to the embodiment shown in Fig. 1 except that, in the embodiment shown in Fig. 5, the cutting device 10 is provided both with a blow device 21 and with a web threading member 23.
The cutting device 10 in accordance with the invention ope-rates during normal winding and during reel exchanges as follows.
During nGr mal -,ur,ning, the blade i6 has beerl run d~wn ~o a iower position so that there is a sufficient space underneath the carrier drum 18. To run the new web upon cutting apart of the complete reel 20, the threading member 23 is placed underneath the carrier drum 18, and the cutting blade 16 of the cutting device 10 is run to its extreme upper position.
In the embodiment shown in Fig. 1, the cutting blade 16 has moved to its extreme upper position through the gap between the carrier drums 18 and 19, in which case it is possible to carry out conventional cutting-off of the web. The cut-off end of the web 204~06~

can be held in its position, e.g., by means of a blow device 21 shown in Figs. 3 and 4. To start new winding, the cutting blade 16 is moved slightly down to permit fitting of a new spool into the gap between the carrier drums 18 and 19.
As the reel exchange constitutes prior art, it will not be described in further detail in connection with the invention dis-closed in the present application. However, it should be nGted that the cutting device 10 in accordance with the invention permits a very smooth and fluent exchange of reel.
Many other variations of the present invention would be obvious to one skilled in the art, and are contemplated to be within the scope of the appended claims.

Claims

1. A cutting device for a web winder, comprising a frame construction, a cutting blade for cutting a web in a reel formed on support of first and second carrier drums, said cutting blade being attached to said frame construction, said cutting blade being movable between an upper position in which said cutting blade is in close proximity to said first carrier drum and a lower position in which said cutting blade is at a substantially greater distance from said first carrier drum relative to said upper position, an actuator, a power transfer member connecting said actuator to said cutting blade such that movement of said actuator is transferred by said power transfer member to move said cutting blade between said upper position and said lower position, wherein said power transfer member comprises a first arm connected to said actuator and pivotally linked to a second arm, said second arm being in turn pivotally linked to a frame of said cutting blade.

2. Cutting device of claim 1, further comprising a synchronization tube attached to said actuator, said synchronization tube synchronizing the pivoting movements of said first arm.

3. The cutting device of claim 2, further comprising a blow device for holding a cut-off end of the web.

4. The cutting device of claim 2, further comprising a web holding device.

5. The cutting device of claim 2, further comprising a threading member for running a new web upon cutting apart of a complete reel.

6. The cutting device of claim 2, wherein said cutting blade is moved along a curved path in relation to a face of said first carrier drum into a gap between said first and second carrier drums.

7. A carrier-drum winder in accordance with claim 6, wherein said cutting device is fitted to move along said curved path of movement into said gap between said first and second carrier drums from a location below said first carrier drum.

8. A carrier-drum winder in accordance with claim 6, wherein said cutting device is fitted to move along said curved path of movement into said gap between said first and second carrier drums from a side of said first carrier drum.