CA2029075C - Method for capturing an end head onto a press platen in a roll wrapping unit and assembly for implementation of the method - Google Patents
Method for capturing an end head onto a press platen in a roll wrapping unit and assembly for implementation of the methodInfo
- Publication number
- CA2029075C CA2029075C CA 2029075 CA2029075A CA2029075C CA 2029075 C CA2029075 C CA 2029075C CA 2029075 CA2029075 CA 2029075 CA 2029075 A CA2029075 A CA 2029075A CA 2029075 C CA2029075 C CA 2029075C
- Authority
- CA
- Canada
- Prior art keywords
- press platen
- end head
- platen
- press
- outer end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B25/00—Packaging other articles presenting special problems
- B65B25/14—Packaging paper or like sheets, envelopes, or newspapers, in flat, folded, or rolled form
- B65B25/146—Packaging paper or like sheets, envelopes, or newspapers, in flat, folded, or rolled form packaging rolled-up articles
- B65B25/148—Jumbo paper rolls
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Basic Packing Technique (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Packaging Of Special Articles (AREA)
- Making Paper Articles (AREA)
- Handling Of Sheets (AREA)
Abstract
The present invention concerns a method and assembly for the capture of an outer end head (4) onto a press platen (1) in roll wrapping unit. According to the method, the outer end head (4) is taken with the help of a clamp (2) close to the press platen (1) and a rapid air flow is injected into the gap between the platen (1) and the end head (4). This air flow effects an underpressure into the gap between the end head (4) and the press platen (1), whereby the end head (4) is forced by the effect of the ambient pressure close to the press platen (1). As soon as the end head (4) is close to the platen (1), a vacuum applied via suction holes (25) in the platen (1) sucks the end head (4) against the platen (1). The assembly in accordance with the invention applies the air flow via a channel (18, 23, 24) arranged to pass through the press platen (1) into the gap between the press platen (1) and the end head (4).
Description
~s, y,.~ ,...
i J ~.~ f J ~ ~'.~ .1 r,.~
Method for capturing an end head onto a press platen in a roll wrapping unit and assemb7.y for the implementation of the method The present invention relates to a method in accordance with the preamble of claim ~, for capturing an end head onto a press platen in a roll wrapping unit.
The invention also concerns an assembly suitable for the implementation of the method.
A wide paper roll, which is delivered from a paper machine, is subsequently transferred to a slitter where it is slit into rolls of appropriate diameter. The rolls are wrapped -a in a wrapping unit for transportation. The roll diameter and length are recorded at the wrapping unit and, on the basis of recorded data, the width and length of the wrap as well as the diameters of end heads are selected. Wrapping is commenced by the insertion of the inner end heads onto the ends of the roll. Next, the wrap is wrapped about the roll. The wrap is wider than the roll making its ends to extend over the ends of the roll. The inner end heads are held clamped to their positions and the edges of the wrap are folded over the ends of the roll. Finally, the outer end heads are inserted onto the ends of the roll, over the edges the folded wrap.
The outer end heads are first captured by clamps equipped with suction cups from end head stacks containing end head of different thicknesses and sizes, from which always the most appropriate end head for the wrap is selected. The clamp captures the uppermost end head in the selected stack and transfers the end head to the press platen. The press platen is a heatable platen which is transferrable in the direction of the axis of the roll placed in the wrapping unit. The press platen incorporates suction holes which provide the capture of the end head by vacuum onto the platen. As soon as the end head has been attached to the platen, the clamp releases the end head and returns to fetch the next end head. The press platen with its captured r' ~~~ ~ ~J y~'~':
i J ~.~ f J ~ ~'.~ .1 r,.~
Method for capturing an end head onto a press platen in a roll wrapping unit and assemb7.y for the implementation of the method The present invention relates to a method in accordance with the preamble of claim ~, for capturing an end head onto a press platen in a roll wrapping unit.
The invention also concerns an assembly suitable for the implementation of the method.
A wide paper roll, which is delivered from a paper machine, is subsequently transferred to a slitter where it is slit into rolls of appropriate diameter. The rolls are wrapped -a in a wrapping unit for transportation. The roll diameter and length are recorded at the wrapping unit and, on the basis of recorded data, the width and length of the wrap as well as the diameters of end heads are selected. Wrapping is commenced by the insertion of the inner end heads onto the ends of the roll. Next, the wrap is wrapped about the roll. The wrap is wider than the roll making its ends to extend over the ends of the roll. The inner end heads are held clamped to their positions and the edges of the wrap are folded over the ends of the roll. Finally, the outer end heads are inserted onto the ends of the roll, over the edges the folded wrap.
The outer end heads are first captured by clamps equipped with suction cups from end head stacks containing end head of different thicknesses and sizes, from which always the most appropriate end head for the wrap is selected. The clamp captures the uppermost end head in the selected stack and transfers the end head to the press platen. The press platen is a heatable platen which is transferrable in the direction of the axis of the roll placed in the wrapping unit. The press platen incorporates suction holes which provide the capture of the end head by vacuum onto the platen. As soon as the end head has been attached to the platen, the clamp releases the end head and returns to fetch the next end head. The press platen with its captured r' ~~~ ~ ~J y~'~':
end head is pressed against the end of the roll. Hot--melt glue, which has been preapplied onto the outer end head side facing the roll, is melted by the heat of the press platen, thus effecting the adherence of the outer end head to the roll end at the cooling of the glue when the press platen is detached from the roll end and the outer end head.
Besides hot-melt gluing, the outer end heads can be attached to the rolls ends using alternative methods. In place of hot-melt glue application, the glue can be extruded or sprayed onto the roll end or end head surface.
Even with these methods, the end head adherence to the roll ' end is effected by means of the press platen.
The outer end heads have a thickness of approx. 0,2...1,5 mm and diameter of approx. 600...1800 mm. Because of the thinness and large diameter of the end heads, they tend to be flexible. Since the end heads are selected from different stacks of different diameters, the end heads must be captured by their center making it impossible to provide full support by the clamp over the entire area of the end head. When the end head is being transferred onto the vertically aligned press platen, the clamp pushes the end head against tree press platen at the center of the end head. Due to the support of the end head only by its center, the edges of the end head are not pushed against the press platen. The upper part of the end head in particular becomes readily bent away from the surface of the press platen. In this case the suction cups of the press platen cannot attain a sufficient vacuum, whereby the end head fails to become fully adhered to the platen. A
poorly adhering end head may detach from the press platen, fold over into the gap between the platen and the roll end or become poorly adhered to the roll end, thus resulting in a defectively wrapped package.
It is an object of the present invention to achieve a method which provides a capture of. the end head close to ~r ~'y!' ~~,"~."
r.',~r,a~3.~ "~~
Besides hot-melt gluing, the outer end heads can be attached to the rolls ends using alternative methods. In place of hot-melt glue application, the glue can be extruded or sprayed onto the roll end or end head surface.
Even with these methods, the end head adherence to the roll ' end is effected by means of the press platen.
The outer end heads have a thickness of approx. 0,2...1,5 mm and diameter of approx. 600...1800 mm. Because of the thinness and large diameter of the end heads, they tend to be flexible. Since the end heads are selected from different stacks of different diameters, the end heads must be captured by their center making it impossible to provide full support by the clamp over the entire area of the end head. When the end head is being transferred onto the vertically aligned press platen, the clamp pushes the end head against tree press platen at the center of the end head. Due to the support of the end head only by its center, the edges of the end head are not pushed against the press platen. The upper part of the end head in particular becomes readily bent away from the surface of the press platen. In this case the suction cups of the press platen cannot attain a sufficient vacuum, whereby the end head fails to become fully adhered to the platen. A
poorly adhering end head may detach from the press platen, fold over into the gap between the platen and the roll end or become poorly adhered to the roll end, thus resulting in a defectively wrapped package.
It is an object of the present invention to achieve a method which provides a capture of. the end head close to ~r ~'y!' ~~,"~."
r.',~r,a~3.~ "~~
the press platen, whereby the suction cups of the platen can effect the adherence of the end head onto the press platen.
The invention is based on guiding a rapid air flow into the gap between the outer end head and the press platen, whereby the air flow streaming between the two planes achieves an underpressure in this gap that provides an even attraction of the outer end head to the vicinity of the press platen.
More specifically, the method in accordance with the invention is characterized by what is stated in the ' characterizing part of claim 1.
Furthermore, the assembly in accordance with the invention is characterized by what is stated in the characterizing part of claim 4.
The invention provides significant benefits.
The invention makes it possible to reduce the number of packaging errors caused by the poor adherence of the end heads to the press platen and subsequently to the end of the roll to be wrapped. The operation of the wrapping units becomes faster, because error situations caused by the poor adherence of the end heads are reduced. During a malfunc-tion, the operation of the unit must generally be stopped and the poorly adhered end head must be manually removed .
In addition to the resultant break in production, the operating personnel are exposed to dangerous conditions.
Since the defectively adhered end head must be manually removed, which necessitates the entry of the operator into the working area o.f the wrapping unit, a hazard is always imminent. Therefore, a reduction of malfunction situations can result in an appreciable improvement in work safety.
The invention is next examined with the help of the attached drawings.
~~°~r~%' a Figure 1 shows diagrammatically the operating principle of the invention.
Figure 2 shows the platen press station in a side view.
Figure 3 shows the platen press station in a front view.
Figure 4 shows an embodiment of the invention in a partially sectional side view.
Figure 5 shows the embodiment illustrated in Fig. 4 in a front view.
Figure 6 shows the press platen in accordance with the invention in a front view.
The operating principle of the invention is illustrated in Figs: 1 and 2. With the help of clamps 2; the outer end heads 4 for both ends of the roll are placed simultaneously onto press platens 1. The end heads 4 are captured onto the press platens l by a vacuum exerted via suction holes 25 and the clamps 2 are controlled to release. The press platens l are rotated from the position designated by dashed lines in Fig. 2 to face the roll ends. In this embodiment of the end head insertion unit, the press platens l and pivotal arms 5 are rotated supported by a sliding guide 7 (Fig. 3). The sliding guide 7 is rotated by means of a hydraulic cylinder 8, whose other end is fixed to a frame 6 of the insertion unit and the other end to the sliding guide 7. After the closing movement toward the roll, the press platens 1 and the pivotal arms 5 are transferred along the sliding guide 7 closer to the roll, whereby the outer end heads 1 are pressed against the roll ends.. The elevated temperature of the heatable press platen 1 has already melted the hot-melt glue applied to the surfaces of the end heads 4 facing 'the roll ends, and concomitantly, the end heads 4 are attached to the roll ends. After the adherence of the end heads 4 is secured, the press platens l are detached and the roll can be r s ~~ ~~ ~ a.:~ 'a.~ y ~.f transferred away.
When a rapid air flow is directed between the gap formed by two closely spaced planes via a discharge hole located 5 between the planes, an underpressure is formed between the planes . If one of the planes is movable, it will find an equilibrium position close the opposite plane determined by ambient pressure and other external forces. The air flow streaming between the planes will, however, maintain the planes spaced by,a small distance.
Fig. 1 illustrates a method of applying the above-described phenomenon to the capture of the outer end heads onto the press platen. As shown in Fig. 1, the outer end head 4 is first pressed against the press platen 1 by means of a clamp 2 equipped with a suction cup 3. The press platen 1 is mounted to the pivotal arm 5 and an air duct 6 is routed via the pivotal arm 5 and the press platen 1 to the center of the press platen. When the end head 4 is first brought by the clamp 2 close to -the press platen 1 or touching the press platen 1, the edges of the end head 4 may fold away from the press platen 1. Naturally, the upper edge of the end head ~ folds more readily than the lower edge.
Therefore, s~xct~.on holes 25 of the press platen 1 fail to capture the end head 4 by the vacuum onto press platen. In order to achieve the complete capture of the end head 4 around its entire perimeter onto the press platen 1, the end head must be brought smoothly close to the press platen 1 to the reach of the vacuum exerted by the suction holes ' 25.
According to the present invention, the capture of the end head 4 to the vicinity of the press platen 1 is implemented by capturing the end head 4 onto the press platen 1 with the help of an underpressure exerted by an air flow injected between the end head 4 and the press platen 1. In . accordance with the invention, the end head 4 is brought by the clamp 2 close to the press platen 1, or alternatively, the end head 4 is pressed against the press platen 1. After !n 5~ ~~ ~ ~~ ~~ %.'J
this operation, the end head 4 is located in the vicinity of the press platen 1 for at least the area enclosing the suction cup 3 of the clamp 2. Next, a rapid air flow is injected via the duct 6 to stream between the end head 4 and the press platen 1. The air is discharged from the center of the end head 4 and the platen 1 toward the edges of said elements. The direction of the air flow is designated by arrow a. Due to the effect of the air flow, an underpressure zone develops between the press platen 1 and the end head 4 at places where the gap between the end head 4 and the platen 1 is small. The gap between the end head 4 and the press platen 1 widens characteristically toward the area of the end head 4 remaining above the suction cup 3 of the clamp 2. Due to the underpressure developing at the narrowest point of the gap, the ambient pressure forces the end ,head 4 toward the press platen 1.
Thereby, the gap is reduced and the underpressure zone can expand toward the edges of the end head 4 and the ambient pressure can further force the entire end head 4 close to the press platen 1. The motion of the end head 4 is designated by arrow b.
The end head 4 finds an equilibrium position close to the press platen 1 determined by the velocity of the air flow routed via the air duct 6, the ambient pressure, and the location of the clamp 2. When the end head 4 approaches sufficiently close to the platen 1, the vacuum applied via the suction holes 25 sucks the outer end head 4 to the press platen Z. As soon as the end head 4 is captured onto the press platen 1, air flow via the duct 6 is cut off.
Since the end head 4 is now very close to the press platen Z, the suction holes 25 can easily hold the end head 4 over its entire area up to the perimeter.
Figs. 4 and 5 illustrate a feed-through nozzle with a con-struction compatible with the press platen and capable of injecting air to the gap between the press platen 1 and the outer end head 4. According to Fi,g. 4, the nozzle is adapted to the press platen having a pressing surface 9 backed by an insulation layer 10. Between the insulation layer 10 and the rear wall L1 of the press platen is located an air conduit 12 through which vacuum can be applied to the suction cups. The air duct of the injection nozzle is routed through the insulation layer 10 and the air conduit 12 within a cylindrical feed-through piece 13.
The feed-through piece 13 is welded at .its one end to the pressing surface 9 while its other end is welded to the rear wall 11 of the platen. At the air conduit 12, the feed-through piece 13 is provided with an opening 14 which allows free flow of air in the conduit 12. The area about the feed-through piece in the rear wall 15 of the insulation layer 10 is strengthened with a support plate 16. The inner surface of the feed-through piece 13 is threaded and, at the side of the rear wall 11, a compressed-air connection adapter 17 is threaded to its end. The adapter 17 is a hex screw having a centered hole 18, whose end at hex end of the screw is threaded for a union adapter 19 of the compressed air connection. The adapter 17 extends past the hole 14 in the feed-through piece 13, thus preventing air injected through the nozzle from entering the air conduit 12. The union adapter 19 is threaded into the hole 18 of the feed-through piece 13, and a compressed-air hose 20 is mounted with a hose clamp 21 to the union adapter.
At the end remaining to the side of pressing surface 9 of the press platen, a screw 22 with a hole 23 drilled to its center is inserted into the threads of the feed-through piece 13. The drilled hole 23 does not fully penetrate the screw 22 but instead, makes an angle to the direction of injection channels 24. The illustrated embodiment has two injection channels 24. The channels 24 are aligned to exit radially outward from the nozzle as shown in Fig. 5.
The preferred embodiment of the invention is implemented by adapting two nozzles 22, 24 of the above-described type to the press platen 1. The nozzles 22, 24 are adapted to the press platen 1 above the center line of the platen so that ~~ ~~ ~ ~ ) ~'~' '~~
the injection channels 24 point toward the perimeter of the platen in a mirror symmetry. This embodiment is advantageous by achieving a faster attraction of the end head 4 to the vicinity of the press platen 1 by virtue of using two nozzles 22, 24 at the upper part of the press platen 1. The lower part of the press platen 1, can be left without nozzles, because the lower part of the end head 4 generally is hanging sufficiently close to the press platen 1 and thus can be sucked against the platen 1 without the augmentation provided by the air flow exiting from the nozzles.
It is obvious that the number of nozzles can be increased even up to 6 or 8, particularly when large end heads must be handled. The construction of the nozzles can be varied from that described above. In the embodiment described above, the vacuum is continually exerted via the suction holes in the press platen 1. When desired, however, the vacuum can be applied only at the instant the end head is brought sufficiently close to the press platen by the effect of the air flow exiting from the nozzles.
The invention is based on guiding a rapid air flow into the gap between the outer end head and the press platen, whereby the air flow streaming between the two planes achieves an underpressure in this gap that provides an even attraction of the outer end head to the vicinity of the press platen.
More specifically, the method in accordance with the invention is characterized by what is stated in the ' characterizing part of claim 1.
Furthermore, the assembly in accordance with the invention is characterized by what is stated in the characterizing part of claim 4.
The invention provides significant benefits.
The invention makes it possible to reduce the number of packaging errors caused by the poor adherence of the end heads to the press platen and subsequently to the end of the roll to be wrapped. The operation of the wrapping units becomes faster, because error situations caused by the poor adherence of the end heads are reduced. During a malfunc-tion, the operation of the unit must generally be stopped and the poorly adhered end head must be manually removed .
In addition to the resultant break in production, the operating personnel are exposed to dangerous conditions.
Since the defectively adhered end head must be manually removed, which necessitates the entry of the operator into the working area o.f the wrapping unit, a hazard is always imminent. Therefore, a reduction of malfunction situations can result in an appreciable improvement in work safety.
The invention is next examined with the help of the attached drawings.
~~°~r~%' a Figure 1 shows diagrammatically the operating principle of the invention.
Figure 2 shows the platen press station in a side view.
Figure 3 shows the platen press station in a front view.
Figure 4 shows an embodiment of the invention in a partially sectional side view.
Figure 5 shows the embodiment illustrated in Fig. 4 in a front view.
Figure 6 shows the press platen in accordance with the invention in a front view.
The operating principle of the invention is illustrated in Figs: 1 and 2. With the help of clamps 2; the outer end heads 4 for both ends of the roll are placed simultaneously onto press platens 1. The end heads 4 are captured onto the press platens l by a vacuum exerted via suction holes 25 and the clamps 2 are controlled to release. The press platens l are rotated from the position designated by dashed lines in Fig. 2 to face the roll ends. In this embodiment of the end head insertion unit, the press platens l and pivotal arms 5 are rotated supported by a sliding guide 7 (Fig. 3). The sliding guide 7 is rotated by means of a hydraulic cylinder 8, whose other end is fixed to a frame 6 of the insertion unit and the other end to the sliding guide 7. After the closing movement toward the roll, the press platens 1 and the pivotal arms 5 are transferred along the sliding guide 7 closer to the roll, whereby the outer end heads 1 are pressed against the roll ends.. The elevated temperature of the heatable press platen 1 has already melted the hot-melt glue applied to the surfaces of the end heads 4 facing 'the roll ends, and concomitantly, the end heads 4 are attached to the roll ends. After the adherence of the end heads 4 is secured, the press platens l are detached and the roll can be r s ~~ ~~ ~ a.:~ 'a.~ y ~.f transferred away.
When a rapid air flow is directed between the gap formed by two closely spaced planes via a discharge hole located 5 between the planes, an underpressure is formed between the planes . If one of the planes is movable, it will find an equilibrium position close the opposite plane determined by ambient pressure and other external forces. The air flow streaming between the planes will, however, maintain the planes spaced by,a small distance.
Fig. 1 illustrates a method of applying the above-described phenomenon to the capture of the outer end heads onto the press platen. As shown in Fig. 1, the outer end head 4 is first pressed against the press platen 1 by means of a clamp 2 equipped with a suction cup 3. The press platen 1 is mounted to the pivotal arm 5 and an air duct 6 is routed via the pivotal arm 5 and the press platen 1 to the center of the press platen. When the end head 4 is first brought by the clamp 2 close to -the press platen 1 or touching the press platen 1, the edges of the end head 4 may fold away from the press platen 1. Naturally, the upper edge of the end head ~ folds more readily than the lower edge.
Therefore, s~xct~.on holes 25 of the press platen 1 fail to capture the end head 4 by the vacuum onto press platen. In order to achieve the complete capture of the end head 4 around its entire perimeter onto the press platen 1, the end head must be brought smoothly close to the press platen 1 to the reach of the vacuum exerted by the suction holes ' 25.
According to the present invention, the capture of the end head 4 to the vicinity of the press platen 1 is implemented by capturing the end head 4 onto the press platen 1 with the help of an underpressure exerted by an air flow injected between the end head 4 and the press platen 1. In . accordance with the invention, the end head 4 is brought by the clamp 2 close to the press platen 1, or alternatively, the end head 4 is pressed against the press platen 1. After !n 5~ ~~ ~ ~~ ~~ %.'J
this operation, the end head 4 is located in the vicinity of the press platen 1 for at least the area enclosing the suction cup 3 of the clamp 2. Next, a rapid air flow is injected via the duct 6 to stream between the end head 4 and the press platen 1. The air is discharged from the center of the end head 4 and the platen 1 toward the edges of said elements. The direction of the air flow is designated by arrow a. Due to the effect of the air flow, an underpressure zone develops between the press platen 1 and the end head 4 at places where the gap between the end head 4 and the platen 1 is small. The gap between the end head 4 and the press platen 1 widens characteristically toward the area of the end head 4 remaining above the suction cup 3 of the clamp 2. Due to the underpressure developing at the narrowest point of the gap, the ambient pressure forces the end ,head 4 toward the press platen 1.
Thereby, the gap is reduced and the underpressure zone can expand toward the edges of the end head 4 and the ambient pressure can further force the entire end head 4 close to the press platen 1. The motion of the end head 4 is designated by arrow b.
The end head 4 finds an equilibrium position close to the press platen 1 determined by the velocity of the air flow routed via the air duct 6, the ambient pressure, and the location of the clamp 2. When the end head 4 approaches sufficiently close to the platen 1, the vacuum applied via the suction holes 25 sucks the outer end head 4 to the press platen Z. As soon as the end head 4 is captured onto the press platen 1, air flow via the duct 6 is cut off.
Since the end head 4 is now very close to the press platen Z, the suction holes 25 can easily hold the end head 4 over its entire area up to the perimeter.
Figs. 4 and 5 illustrate a feed-through nozzle with a con-struction compatible with the press platen and capable of injecting air to the gap between the press platen 1 and the outer end head 4. According to Fi,g. 4, the nozzle is adapted to the press platen having a pressing surface 9 backed by an insulation layer 10. Between the insulation layer 10 and the rear wall L1 of the press platen is located an air conduit 12 through which vacuum can be applied to the suction cups. The air duct of the injection nozzle is routed through the insulation layer 10 and the air conduit 12 within a cylindrical feed-through piece 13.
The feed-through piece 13 is welded at .its one end to the pressing surface 9 while its other end is welded to the rear wall 11 of the platen. At the air conduit 12, the feed-through piece 13 is provided with an opening 14 which allows free flow of air in the conduit 12. The area about the feed-through piece in the rear wall 15 of the insulation layer 10 is strengthened with a support plate 16. The inner surface of the feed-through piece 13 is threaded and, at the side of the rear wall 11, a compressed-air connection adapter 17 is threaded to its end. The adapter 17 is a hex screw having a centered hole 18, whose end at hex end of the screw is threaded for a union adapter 19 of the compressed air connection. The adapter 17 extends past the hole 14 in the feed-through piece 13, thus preventing air injected through the nozzle from entering the air conduit 12. The union adapter 19 is threaded into the hole 18 of the feed-through piece 13, and a compressed-air hose 20 is mounted with a hose clamp 21 to the union adapter.
At the end remaining to the side of pressing surface 9 of the press platen, a screw 22 with a hole 23 drilled to its center is inserted into the threads of the feed-through piece 13. The drilled hole 23 does not fully penetrate the screw 22 but instead, makes an angle to the direction of injection channels 24. The illustrated embodiment has two injection channels 24. The channels 24 are aligned to exit radially outward from the nozzle as shown in Fig. 5.
The preferred embodiment of the invention is implemented by adapting two nozzles 22, 24 of the above-described type to the press platen 1. The nozzles 22, 24 are adapted to the press platen 1 above the center line of the platen so that ~~ ~~ ~ ~ ) ~'~' '~~
the injection channels 24 point toward the perimeter of the platen in a mirror symmetry. This embodiment is advantageous by achieving a faster attraction of the end head 4 to the vicinity of the press platen 1 by virtue of using two nozzles 22, 24 at the upper part of the press platen 1. The lower part of the press platen 1, can be left without nozzles, because the lower part of the end head 4 generally is hanging sufficiently close to the press platen 1 and thus can be sucked against the platen 1 without the augmentation provided by the air flow exiting from the nozzles.
It is obvious that the number of nozzles can be increased even up to 6 or 8, particularly when large end heads must be handled. The construction of the nozzles can be varied from that described above. In the embodiment described above, the vacuum is continually exerted via the suction holes in the press platen 1. When desired, however, the vacuum can be applied only at the instant the end head is brought sufficiently close to the press platen by the effect of the air flow exiting from the nozzles.
Claims (5)
1. A method for capturing an outer end head (4) onto a press platen (1) in roll wrapping unit, in which method the end head (4) is taken with the help of a clamp (2) close to the press platen (1) and sucked by vacuum against the press platen (1), characterized in that when an outer end head (4) is brought close to the press platen (1), a rapid flow of air is applied via at least one nozzle (6) arranged to the press platen (1) into the gap remaining between the end head (4) and the press platen (1), whereby the air flow effects a first underpressure between the adjacent planes (1, 4) and the ambient pressure forces the outer end head (4) close to the press platen (1) and another vacuum source is applied to suck the end head (4) against the press platen (1).
2. A method in accordance with claim 1, characterized in that the second vacuum source is continuously applied into the gap between the press platen (1) and the end head (4).
3. A method in accordance with claim 1, characterized in that the second vacuum source is applied only after the outer end head (4) has been forced by the first underpressure against the press platen (1).
4. An assembly for the capture of an outer end head (4) onto a press platen (1) in a roll wrapping unit, said unit comprising - at least one press platen (1) provided with suction holes (25) through which a vacuum can be applied to capture the end head (4) onto the press platen (1) and - means (5, 7, 8) for transferring the press platen (1) against the end of the roll to be wrapped, characterized by - at least one nozzle assembly for air injection arranged into the press platen (1), said assembly comprising a compressed air connection and an air injection channel (18, 23, 24) extending up to the pressing surface (9) of the press platen (1) for injecting air into the gap between the pressing surface (9) and the outer end head (1).
5. An assembly in accordance with claim 4, characterized in that the end (23, 24) of the air injection channel (18, 23, 24) extending up to the pressing surface (9) of the press platen (1) is aligned essentially parallel with the plane of the pressing surface (9).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI895205A FI83859C (en) | 1989-11-01 | 1989-11-01 | FOERFARANDE FOER UPPTAGNING AV EN YTTERLAPP PAO EN PRESSKIVA I EN RULLFOERPACKNINGSMASKIN OCH ANORDNING FOER TILLAEMPNING AV FOERFARANDET. |
| FI895205 | 1989-11-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2029075A1 CA2029075A1 (en) | 1991-05-02 |
| CA2029075C true CA2029075C (en) | 2001-01-30 |
Family
ID=8529275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2029075 Expired - Lifetime CA2029075C (en) | 1989-11-01 | 1990-10-31 | Method for capturing an end head onto a press platen in a roll wrapping unit and assembly for implementation of the method |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2029075C (en) |
| DE (1) | DE4034395C2 (en) |
| FI (1) | FI83859C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10025510C2 (en) * | 2000-05-23 | 2002-04-18 | Voith Paper Patent Gmbh | Method and device for attaching an outer front cover to a roll of material web to be packed |
| DE102006056726A1 (en) | 2006-12-01 | 2008-06-05 | Voith Patent Gmbh | A packaging apparatus and method for attaching outer end caps to a roll |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI72936C (en) * | 1984-12-31 | 1987-08-10 | Waertsilae Oy Ab | ANORDNING VID RULLPACKNINGSMASKIN FOER ANBRINGANDE AV MJUKA INNERAENDLAPPAR. |
-
1989
- 1989-11-01 FI FI895205A patent/FI83859C/en not_active IP Right Cessation
-
1990
- 1990-10-29 DE DE19904034395 patent/DE4034395C2/en not_active Expired - Fee Related
- 1990-10-31 CA CA 2029075 patent/CA2029075C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE4034395C2 (en) | 1999-10-28 |
| DE4034395A1 (en) | 1991-05-02 |
| FI83859C (en) | 1991-09-10 |
| CA2029075A1 (en) | 1991-05-02 |
| FI83859B (en) | 1991-05-31 |
| FI895205A0 (en) | 1989-11-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed | ||
| MKEC | Expiry (correction) |
Effective date: 20121202 |