JP5159182B2 - Sheet cutting device - Google Patents

Description

  The present invention relates to a sheet cutting apparatus that cuts a continuously supplied belt-like sheet into every leaf and continuously transfers it at predetermined intervals.

  As a prior art relating to a sheet cutting apparatus that cuts a continuously supplied belt-like sheet every leaf and continuously transfers it at predetermined intervals, the techniques described in Patent Documents 1 and 2 below are known. .

  The technique described in Patent Document 1 is a device that cuts a continuous sheet member into a predetermined size with a rotary cutter, and then separates the sheets cut with two sets of transfer conveyors having different transfer speeds (hereinafter also referred to as re-pitch). It is about. For this reason, the conveyor of the length according to the space | interval to separate is needed, and the whole apparatus had to be large sized. Further, when the sheet member is lightweight, a posture failure is likely to occur when the sheet member is separated. The technique described in Patent Document 2 relates to an apparatus that separates a sheet cut by a re-pitch device whose peripheral speed changes after a continuous elastic member is cut into a predetermined size with a rotary cutter. However, this device also has to have a large re-pitch device.

JP-A-57-31858 JP 2004-148040 A

  The present invention has been made in view of the above problems, and continuously feeds a continuously supplied belt-like sheet into every leaf without a complicated mechanism and continuously transfers it at predetermined intervals. An object of the present invention is to provide a sheet cutting device that can perform the above-described process.

  The present invention is a sheet cutting device that cuts a strip-like sheet continuously supplied from a sheet supply means into every leaf and continuously transfers it at predetermined intervals, a cutter roll, an anvil roll, A dancer roll mechanism that reciprocates in contact with the sheet supplied between the rolls, and the anvil roll adsorbs the sheet to the outer peripheral surface and is faster than the supply speed of the sheet by the supply means The dancer roll mechanism, which rotates at a peripheral speed, achieves the object by providing a sheet cutting device including a dancer roll that presses the sheet against the outer peripheral surface of the anvil roll during sheet cutting. Is.

  The cutting device of the present invention can cut the continuously supplied belt-like sheets into simple leaves without complicated mechanisms and continuously transfer them at predetermined intervals. In particular, the present invention provides a technique capable of cutting a thin sheet, a brittle sheet, an extensible sheet, and the like without causing burrs or scratches.

  Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.

  1 and 2 are schematic views showing an embodiment of a sheet cutting device (hereinafter also simply referred to as a cutting device) according to the present invention. In FIG. 1, reference numeral 1 denotes a cutting device, and 10 denotes a sheet.

  As shown in FIG. 1, the cutting apparatus 1 of the present embodiment cuts a strip-shaped sheet 10 continuously fed at a constant speed from a sheet feeding unit 11 into leaves, and then cuts the cut sheet. It is a device that continuously moves by re-pitching at predetermined intervals, and includes a cutter roll 2, an anvil roll 3, and a dancer roll mechanism 4 that reciprocates in contact with a sheet 10 supplied between the rolls 2 and 3. I have.

  In the present embodiment, the sheet supply means 11 includes rolls 11A and 11B that rotate around a horizontal axis. These rolls 11A and 11B are configured to transfer the sheet 10 fed from the original fabric to the outer periphery of the anvil roll 3. It is arranged to lead to the surface and supply.

  The cutter roll 2 includes a roll main body 20 and a plurality (six in this embodiment) of blades 21 fixed to the roll main body 20 at a predetermined angle with a predetermined interval. The cutter roll 2 is provided to rotate following the anvil roll 3. The cutter roll can be driven and rotated by, for example, a gear mechanism or servo synchronization with the anvil roll.

  The anvil roll 3 is composed mainly of a roll body 30. A plurality of suction holes h are provided on the outer peripheral surface of the roll body 30 at predetermined intervals over the entire circumference and the width direction. On the side surface of the anvil roll body 30, suction holes H connected to the suction holes h and the suction passage E are provided at predetermined intervals over the entire circumference of the side surface. A suction chamber 31 is disposed on a side surface portion of the anvil roll main body 30. As long as the anvil roll 3 rotates and the suction hole H is positioned in the suction chamber 31, the suction force is transmitted through the suction hole H and the suction passage E, and the sheet 10 is sucked into the suction hole h. The suction range of the sheet 10 on the anvil roll 3 is determined by the size of the suction chamber 31. In the case of FIG. 1, the cutting position C of the sheet 10 by the cutter roll is in front (in this embodiment, the uppermost part of the roll body 30). : 0 o'clock position) from the cutting position to the lowermost part of the roll body 30 (6 o'clock position), and the suction chamber 31 can be rotated and moved to an arbitrary rotation position (angle). The suction position of the sheet 10 can be changed by changing the fixing position of the suction chamber 31. Connected to the suction chamber 31 is a conduit 32 that leads to suction means (not shown). The suction range can also be changed by appropriately changing the size (angle) of the suction chamber 31.

  The anvil roll 3 is provided so as to suck the sheet 10 to be cut to the outer peripheral surface and rotate at a constant peripheral speed faster than the supply speed of the sheet 10 by the supply means 11. The anvil roll 3 is provided so as to continuously adsorb and transfer the sheet 10A cut from the sheet 10 every leaf at the cutting position C. If the position at which the sheet 10 starts to be attracted to the outer peripheral surface of the anvil roll 3 (hereinafter referred to as an adsorption start position) is started from the upstream side (the dancer roll 41 side) of the cutting position C of the sheet 10, for example, the S point, In particular, in the case where the sheet 10 is a material that has air permeability such as a nonwoven fabric and is difficult to adsorb, it is desirable from the viewpoint of ensuring sheet transfer and sheet cutting.

  The dancer roll mechanism 4 is integrated with a dancer roll 41, a bracket 42 that horizontally supports the dancer roll 41, a guide rail 43 that reciprocates the bracket 42 in a straight line, and a guide rail 43. And a guide table 45 provided on the rail 43 so as to be able to reciprocate in a predetermined direction. The guide rail 43 is fixed to a frame (not shown). The bracket 42 is fixed to the guide table 45. A spring 44 is hung between the guide table 45 and the lower end portion of the guide rail 43. When the dancer roll 41 presses the seat 10 against the outer peripheral surface of the anvil roll 3, the spring 44 contracts. When the dancer roll 41 rises and the bracket 42 rises according to the change in tension applied to the sheet 10 when the sheet 10 is cut, the spring 44 is extended. The dancer roll mechanism 4 is provided in such a manner that the dancer roll 41 presses the sheet 10 against the outer peripheral surface of the anvil roll 3 in accordance with a change in tension applied to the sheet 10.

  Here, the dancer roll is composed of a roll, a spring, and the like, and is originally intended to apply a certain tension to the sheet regardless of the change in its position. It is also installed for the purpose of cutting the sheet cleanly without causing tearing.

  The cutting device 1 is synchronized with the supply means 11 and the gear mechanism.

  In the cutting device 1, in a steady operation state, the cutter roll 2 and the anvil roll 3 rotate equally at the peripheral speed V 3 of the anvil roll 3, and the sheet 10 is fed from the rolls 11 A and 11 B of the sheet feeding means 11 between them. It is supplied at a constant speed V10 that is lower than the peripheral speed V3.

  When the sheet 10 is supplied at the speed V10 by the rolls 11A and 11B of the supply unit 11 and passes the suction start position S, the sheet 10 starts to be adsorbed on the outer peripheral surface of the anvil roll 3. As the anvil roll 3 rotates, the anvil roll 3 is transferred to the cutting position C at a peripheral speed V3. At this time, in order to re-pitch the cut sheet at a predetermined interval D, the peripheral speed V3 of the anvil roll 3 is faster than the supply speed V10 of the sheet 10 by the supply means 11. The speed ratio V3 / V10 between the peripheral speed V3 of the anvil roll 3 and the supply speed V10 of the sheet 10 is preferably 1.1 to 5, and is preferably 1.2 to 2 so that the apparatus does not become large. And more preferable.

  Since the peripheral speed V3 of the anvil roll 3 is faster than the supply speed V10 of the sheet 10 by the supply means 11, the sheet 10 is transferred to the cutting position C at the speed V10 while slipping on the outer peripheral surface of the anvil roll 3, and the cutter roll Cut with two blades 21. In this case, P1 in FIG. 1 is the contact point between the seat 10 and the dancer roll 41 in the lowered position, P2 is the contact point between the seat 10 and the dancer roll 41 in the raised position, P3 is the roll 11A, 11B and the sheet 10 If the dancer roll 41 is in the lowered position, the sheet length L1 (the length between S-P1-P3) is the sheet length L2 when the dancer roll 41 is in the raised position (S -Length between P2 and P3). Further, while the sheet 10 is being cut, the sheet transfer speed is the same as the rotational speed of the blade 21, and therefore the same speed as the peripheral speed V 3 of the anvil roll 3. Therefore, the sheet 10 is pulled by the blade 21 by the amount L1-L2, and the dancer roll is raised to the raised position. During this time, since the weight of the movable part (dancer roll 41, bracket 42, spring 44, etc.) reciprocally moved by the dancer roll mechanism 4 is applied to the sheet 10, a certain tension is applied to the sheet 10. Therefore, without causing the tearing phenomenon as shown in FIG. 3 (a), the sheet 10 can be cut cleanly with no burrs or scratches on the cut surface as shown in FIG. 3 (b). When the brittle sheet containing iron powder shown in the examples described later is cut and re-pitched, the apparatus of the present invention is particularly effective from the viewpoint of cutting the sheet cleanly.

  When the sheet 10 is cut, the dancer roll 41 of the dancer roll mechanism 4 descends and presses the sheet 10 against the surface of the anvil roll 3. Further, the sheet 10 and the cut sheet 10 </ b> A are transported with a gap D due to the speed difference between the peripheral speed V <b> 3 of the anvil roll 3 and the supply speed V <b> 10 of the sheet 10. In the cutting device 1, the sheet 10 is repeatedly cut, and the sheet 10A is transferred at regular intervals. Here, the supply speed V10 of the sheet 10 can be appropriately set depending on the required production capacity, the material of the sheet, and the like, but is preferably 3 to 100 m / min, and more preferably 10 to 30 m / min. Here, a spring 44 that is an elastic body that controls the total weight of the movable parts (dancer roll 41, bracket 42, spring 44, etc.) of the dancer roll mechanism 4 and the amount of displacement of the movable part and the tension applied to the seat 10 is generated. The total load is preferably set lower than the breaking load of the sheet 10 (tensile load necessary for breaking the sheet 10) and higher than the suction force that adsorbs the sheet 10 onto the outer peripheral surface of the anvil roll 3. With this setting, the sheet 10 can be slipped on the outer peripheral surface of the anvil roll 3 without breaking the sheet 10 at the time of transfer and while the sheet 10 is not cut. Can be prevented.

  As described above, according to the cutting device 1 of the present embodiment, a complicated mechanism is unnecessary, and a belt-like sheet continuously supplied is simply cut into leaves and continuously transferred at predetermined intervals. can do. Moreover, since the cutting device 1 of this embodiment can control tension | tensile_strength even if speeds differ like the circumferential speed V3 and the strip | belt-shaped sheet supply speed V10 by installing the dancer roll mechanism 4, a cutter roll The cut surface by the two blades 21 can also be a straight cut surface.

  The cutting device of the present invention is not limited to the above embodiment.

  In the cutting device 1 of the above-described embodiment, the peripheral speed V3 of the anvil roll 3 is set to a constant speed. However, the peripheral speed V3 may be changed as long as it is higher than the sheet supply speed. In this case, the interval between the belt-like sheet 10 and the cut sheet 10A can be changed.

  Further, the peripheral speeds of the cutter roll and the anvil roll may or may not be the same.

  In the cutting device 1 of the above embodiment, a servo motor can be used as the movable means of the movable part of the dancer roll mechanism 4. When the servo motor is used, the actual tension applied to the sheet, the actual peripheral speed of the cutter roll 2 and the anvil roll 3, the position of the blade 21 of the cutter roll 2 and the like are appropriately detected and transmitted to the servo controller to control the servo motor. By doing so, the optimum tension on the sheet and the sheet length between S (adsorption start position) to P3 (contact point between the rolls 11A and 11B and the sheet 10) can be controlled, and a sheet with a clean cut surface can be obtained. Can do.

  In the cutting apparatus of the present invention, there is no particular limitation on the sheet to be cut, and non-woven fabrics, polymer films, paper, metal films, etc. can be used, and these composites and multilayers can also be used. Can do. Furthermore, fiber sheets and papermaking sheets that support and contain functional powders such as exothermic powders and catalyst powders, which will be described later in Examples, can also be used. Furthermore, a brittle sheet can also be used. Here, the fragile sheet refers to a sheet having a sheet elongation of 5 mm or less and a breaking load of 25 N or less when a tensile load is applied to the sheet having a width of 15 mm. Moreover, it can be used especially suitably for cutting | disconnection of sheets, such as an elastic sheet used for a wearing article. In this case, it is applicable also to the cutting | disconnection which provides tension | tensile_strength beyond elastic deformation areas, such as an elastic sheet. Further, the thickness of the sheet is preferably 0.001 to 10 mm, preferably 0.01 to 10 mm, and more preferably 0.05 to 5 mm.

  Hereinafter, the present invention will be described more specifically with reference to examples. In addition, this invention is not restrict | limited at all by a present Example.

[Example 1]
As in the following examples, for the apparatus shown in FIG. 1 and FIG. 2, cutting and re-pitch of the sheet similar to the papermaking sheet described in Japanese Patent No. 3703469 proposed by the applicant under the following conditions, The cut surface of the sheet and the state of the re-pitch were observed.

[Composition of sheet]
Iron powder (45 μm mesh classification, manufactured by Dowa Iron Mining Co., Ltd., trade name “RKH”), 84% by mass
Pulp fiber (NBKP, manufactured by Pope & Talbot Co., Ltd., trade name “Mackenzie”, average fiber length = 2.1 mm), 8% by mass
Activated carbon (45 μm mesh classified product, manufactured by Nippon Enviro Chemicals Co., Ltd., trade name “Carborafin (registered trademark)”), 8% by mass
Width 98mm
Basis weight per sheet 400-500 g / m ²
Breaking strength per sheet: 130N
[Sheet transfer conditions]
Sheet supply speed: 10.8 m / min
By embossing the three stacked sheets, the integrated sheets were transferred and cut.
[Dancer roll mechanism]
Total weight of moving parts: 8.8N
Elastic body: Spring (spring constant: 0.5 N / mm, deflection: 10 mm)
[Anvil Roll]
Diameter: 162mm
Peripheral speed: 17m / min (speed ratio: 1.57)
Sheet suction force: 8N
[Cutter roll]
Diameter: 162mm
Peripheral speed: 17m / min
Number of blades: 6

〔result〕
As a result of cutting and re-pitching 2000 sheets, the cut sheet length was 54 mm ± 1.5 mm, and the re-pitch interval was 31 mm ± 2 mm.
In addition, said value is the result of having measured the sheet | seat continuously transferred and cut | disconnected using the image processing apparatus (Matsushita Electric Works Co., Ltd. multi checker A210) online.

(Observation of cut surface)
As shown in FIG. 3B, the cut sheet was not torn and a good cut state could be obtained.
[Repitch]
As described above, the re-pitch can be performed at a predetermined interval.

It is a mimetic diagram showing one embodiment of a sheet cutting device of the present invention. It is a mimetic diagram showing composition of a dancer roll mechanism in one embodiment of a sheet cutting device. It is a figure which shows the cutting state of a sheet | seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet cutting device 2 Cutter roll 3 Anvil roll 30 Roll main body 31 Suction chamber 4 Dancer roll mechanism 41 Dancer roll 10 Sheet 11 Sheet supply means

Claims (5)

A sheet cutting device that cuts a strip-like sheet continuously supplied from a sheet supply means into each leaf and continuously transfers it at predetermined intervals,
A cutter roll, an anvil roll, and a dancer roll mechanism that reciprocates in contact with the sheet supplied between the rolls,
The anvil roll adsorbs the sheet to the outer peripheral surface and rotates at a peripheral speed faster than the supply speed of the sheet by the supply unit;
The dancer roll mechanism comprises a dancer roll that presses the sheet against the outer peripheral surface of the anvil roll when the sheet is cut,
The adsorption start position at which the sheet starts to be adsorbed on the outer peripheral surface of the anvil roll is upstream of the sheet cutting position,
A contact point between the sheet and the dancer roll is located between the suction start position and the supply means, and the upstream side of the suction start position causes the dancer roll to remove the sheet from the outer periphery of the anvil roll. A sheet cutting device adapted to press against a surface .   2. The sheet according to claim 1, wherein a ratio of a peripheral speed of the anvil roll and a supply speed of the sheet (a peripheral speed of the anvil roll / a supply speed of the sheet) is 1.1 to 5. 3. Cutting device.   The sheet cutting device according to claim 1, wherein the cutter roll and the anvil roll are provided so as to rotate at a constant peripheral speed.   In the anvil roll, a plurality of suction holes are provided on the outer peripheral surface at predetermined intervals over the entire circumference and the width direction, and suction holes connected to the suction holes are formed on the side surface over the entire circumference of the side surface. A roll body provided at predetermined intervals, and a suction chamber disposed in a side surface portion of the roll body. The anvil roll rotates so that the suction hole is positioned in the suction chamber. The sheet cutting device according to any one of claims 1 to 3, wherein a suction force is transmitted through the suction hole only while the sheet is sucked and the sheet is sucked into the suction hole.   The suction range of the sheet on the anvil roll is determined by the size of the suction chamber, and reaches from near the cutting position of the sheet by the cutter roll to near the bottom of the roll body. The sheet cutting device according to claim.