JP2013056721A - Web conveyance device capable of simultaneously feeding webs from a plurality of sheet materials - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a web conveyance device capable of setting a plurality of rolled sheet materials.SOLUTION: This web conveyance device comprises: two feed shafts 21 having hollow spaces, to each of which the rolled sheet material 10 is set; a differential device 22 in which the two feed shafts 21 are connected to hollow side gears 23, respectively; a nip roller 31 nipping webs 11 fed from the respective rolled sheet materials 10 in common to convey the webs; and a drive shaft 28 extending by penetrating the hollow space of the two feed shafts 21 and the hollow side gear 23 of the differential device 22. Two feed shafts 28 are coaxially arranged, a pinion shaft 25 of the differential device 22 is connected to the drive shaft 28, and the pinion shaft 25 revolves by the rotation of the drive shaft 28.

Description

  The present invention relates to a web conveyance device.

  With reference to FIG. 6, a gravure printing machine including a conventional web conveyance device will be described. FIG. 6 is a schematic diagram showing an example of the configuration of a conventional gravure printing machine. As shown in FIG. 6, the gravure printing machine includes a feeding unit 502, an infeed unit 503, a printing unit 504, an outfeed unit 505, and a winding unit 506. A roll-shaped original fabric 500 is set on the feeding shaft of the feeding unit 502. As the feed shaft is driven, a web (printing object such as paper, plastic film, metal foil, etc.) 501 is fed to the in-feed unit 503 from the roll-shaped raw material. The web 501 to be fed is fed to the printing unit 504 via the infeed unit 503, and printing processing is performed in the printing unit 504. Thereafter, the sheet is discharged via the outfeed unit 505 and is wound by the winding unit 506.

  FIG. 7 is a schematic diagram for explaining the feeding mechanism unit of a conventional printing machine in more detail. 7 feeds and feeds a feed shaft 510 on which a roll-shaped original fabric 500 is set and a web 501 fed from the roll-shaped original fabric 500 by the feed shaft 510. A nip roller 511. The nip roller 511 includes a driving roller 512 that is rotationally driven, and a rubber roller 513 that is disposed to face the driving roller 512 and presses the web 501 with the driving roller 512. After the roll-shaped original fabric 500 is set on the feeding shaft 510, the web 501 is fed from the roll-shaped original fabric 500 by the rotation of the feeding shaft 510. The web 501 to be fed is conveyed while being held between the driving roller 512 and the rubber roller 513. Here, the tension of the web 501 to be fed is controlled by adjusting the rotation speed of the feed shaft 510 and the rotation speed of the drive roller 512.

Furthermore, with reference to FIG. 8, the relationship between the tension | tensile_strength of a web and the diameter of a roll-shaped original fabric is demonstrated. FIG. 8 is a schematic diagram for explaining the relationship between the roll-shaped raw fabric diameter and the web tension. As shown in FIG. 8, the feed mechanism portion of the conventional printing apparatus, a roll having relatively raw and rolled with a diameter r _a a larger diameter, the diameter r _b is relatively small Let us consider a case in which both the original fabric and the same web are set on the same feed shaft 510. In this case, the feeding shaft (corresponding to the diameter _{r a)} web 501a fed from the raw by the rotation of 510 and the web 501b (corresponding to the diameter _{r b)} is narrow in common by the drive roller 512 and the rubber roller 513 It is conveyed while being held. Here, because the angular velocity ω of the feeding shaft 510 and the raw angular velocity is of course the same, towards the feed speed V _a of the web 501a is fed from raw larger diameter r _a, small is fed from the original fabric of the diameter _{r b} is faster than the feeding speed _{V b} of the web 501b. Therefore, the web 501a is slackened and tension is not applied, and the web 501a cannot be fed properly, or the web 501b is excessively tensioned and the web 501b is broken.

  On the other hand, a wide roll-shaped raw material is set on the feed shaft, the web is divided using a slitter device or the like in the processing step, and the plurality of divided webs are simultaneously wound in parallel. Such a web conveyance device is known (Patent Document 1). However, there is no known web conveyance device that can set a plurality of roll-shaped original fabrics.

Japanese Patent Publication No. 28888704

  The present invention has been devised to pay attention to the above problems and to effectively solve them. The objective of this invention is providing the web conveyance apparatus which can set several roll-shaped original fabric.

  The present invention includes two feeding shafts each having a hollow space in which a roll-shaped raw fabric is set, a differential device in which the two feeding shafts are each connected to a hollow side gear, A nip roller for commonly nipping and conveying a web fed from an original fabric, and a drive shaft extending through a hollow space of the two feed shafts and a hollow side gear of the differential, The two feeding shafts are arranged coaxially, the pinion shaft of the differential device is connected to the drive shaft, and the pinion shaft is revolved by the rotation of the drive shaft. It is a web conveyance device.

  According to the present invention, it is possible to allow a difference in angular velocity between the feeding shafts on which the two roll-shaped original fabrics are set, and therefore there is a difference between the diameters of the two roll-shaped original fabrics. Also, the tension of each web can be suitably controlled. For this reason, the web conveyance apparatus which can be fed simultaneously from two roll-shaped original fabrics and can endure practical use is realizable.

  Preferably, one feed shaft extends through a hollow space of the other feed shaft, and the differential is provided on the same side with respect to the two feed shafts. If such a form is adopted, the overall size of the web conveyance device can be further reduced.

  Preferably, the web conveyance device further includes a printing unit. In the printing unit, it is required to control the tension of each web with higher accuracy. However, according to the present invention, the request can be sufficiently met.

  Alternatively, preferably, the web conveyance device further includes a coating unit. Even in the coating portion, it is required to control the tension of each web with higher accuracy. However, according to the present invention, the request can be sufficiently met.

  Further, the present invention provides four feed shafts each having a hollow space in which roll-shaped raw fabrics are set, and two pairs of the four feed shafts, each connected to a hollow side gear. A first differential device, a second differential device having a hollow shaft member disposed between the two first differential devices and connected to a hollow side gear, and feeding from each roll-shaped raw material A nip roller that carries the web to be held in common, the hollow space of the four feeding shafts, the hollow side gear of the two first differential devices, and the hollow side gear of the second differential device The four feed shafts are coaxially arranged, and the pinion shafts of the two first differential devices are connected to the side gears of the second differential device. A pinion shaft of the second differential device is connected to the hollow shaft member. Shift is being connected to the drive shaft, each pinion shaft of the second differential device is a web conveying apparatus characterized by being adapted to revolve by the rotation of the drive shaft.

  According to the present invention, it is possible to allow the difference in angular velocity between the feeding shafts on which the four roll-shaped raw materials are set, and therefore there is a difference in the diameters of the four roll-shaped raw materials. Also, the tension of each web can be suitably controlled. For this reason, the web conveyance apparatus which can be fed simultaneously from four roll-shaped original fabrics and can endure practical use is realizable.

  Preferably, one of the feed shafts paired by each first differential device extends through the hollow space of the other feed shaft of each paired feed shaft, Each first differential device is provided on the same side with respect to the two feeding shafts each paired. If such a form is adopted, the overall size of the web conveyance device can be further reduced.

  According to the present invention, it is possible to allow a difference in angular velocity between the feeding shafts on which the two roll-shaped original fabrics are set, and therefore there is a difference between the diameters of the two roll-shaped original fabrics. Also, the tension of each web can be suitably controlled. For this reason, the web conveyance apparatus which can be fed simultaneously from two roll-shaped original fabrics and can endure practical use is realizable.

  Alternatively, according to the present invention, it is possible to allow a difference in angular velocity between the feeding shafts on which the four roll-shaped original fabrics are set. Even if it exists, the tension | tensile_strength of each web can be controlled suitably. For this reason, the web conveyance apparatus which can be fed simultaneously from four roll-shaped original fabrics and can endure practical use is realizable.

  Further, by adopting a configuration in which an unnecessary number of feeding shafts are thinned out from such a web conveying device, a web conveying device capable of simultaneously feeding four or less webs can be realized.

It is the schematic which shows the web conveyance apparatus in the 1st Embodiment of this invention. It is the schematic which shows the principal part of the web conveyance apparatus of FIG. It is the schematic which shows the principal part of the web conveyance apparatus in the 2nd Embodiment of this invention. It is the schematic which shows the principal part of the web conveyance apparatus in the 3rd Embodiment of this invention. The other example of a structure of the 1st differential in the 3rd Embodiment of this invention is shown. It is the schematic which shows an example of a structure of the conventional gravure printing machine. It is a schematic diagram for demonstrating the feeding mechanism of the conventional printing machine. It is a schematic diagram for demonstrating the relationship between the diameter of a roll-shaped original fabric, and the tension | tensile_strength of a web.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic diagram showing a web conveyance device according to a first embodiment of the present invention. As shown in FIG. 1, the web conveyance device according to the present embodiment includes a feeding unit 20, an infeed unit 30, a printing unit 40, an outfeed unit 50, and a winding unit 60. Yes. Then, the roll-shaped raw fabric 10 is set on the feeding shaft of the feeding unit 20. As the feed shaft is driven, the web 11 is fed from the roll-shaped original fabric to the infeed unit 30. The web 11 to be fed is fed to the printing unit 40 via the infeed unit 30, and printing processing is performed in the printing unit 40. Thereafter, the paper is discharged through the outfeed unit 50 and wound up by the winding unit 60.

  FIG. 2 is a schematic view showing a main part of the web conveyance device of FIG. The web conveyance device in the present embodiment connects two feeding shafts 21a and 21b having a hollow space and two feeding shafts 21a and 21b to which roll-shaped original fabrics 10a and 10b are respectively set. It comprises a differential device 22 and a drive shaft 28 for rotating the feed shafts 21a and 21b via the differential device 22. Further, the web conveyance device includes a nip roller 31 that nipping and conveying the webs 11a and 11b fed from the roll-shaped original fabrics 10a and 10b in common.

  Each of the feed shafts 21a and 21b can be set with a roll-shaped raw fabric 10 having various widths. The two feeding shafts 21 a and 21 b are arranged coaxially and are connected to the hollow side gears 23 a and 23 b of the differential device 22, respectively. Thereby, each side gear 23a and 23b, each feeding shaft 21a and 21b, and each original fabric 10a and 10b can rotate integrally, respectively.

  The nip roller 31 includes a driving roller 32 that is rotationally driven, and a rubber roller 33 that is disposed so as to face the driving roller 32 and presses the web 11 between the driving roller 32. The driving roller 32 and the rubber roller 33 are supported so as to be rotatable at right angles and horizontally with respect to the conveying direction of the web 11. Further, the drive roller 32 is rotationally driven by a motor.

  The differential device 22 has a pair of pinion gears 24 that have side gears 23a and 23b connected to the feed shafts 21a and 21b, respectively, and a rotation shaft that is orthogonal to the rotation shafts of the side gears 23a and 23b. And a pinion shaft 25 that rotatably supports the pair of pinion gears 24.

  In the example of FIG. 2, the side gears 23 a and 23 b and the pair of pinion gears 24 are configured as bevel gears, and the side gears 23 a and 23 b mesh with the pair of pinion gears 24 at right angles. With such a configuration, the pair of pinion gears 24 absorbs a rotational speed difference (angular speed difference) between the side gear 23a and the side gear 23b.

  The drive shaft 28 extends through the hollow space of the two feed shafts 21 a and 21 b and the hollow side gears 23 a and 23 b of the differential 22. The drive shaft 28 is connected to the pinion shaft 25 so that the axis lines thereof are orthogonal to each other. The initial rotation speed of the drive shaft 28 is determined so that the rotation speed of the feeding shaft 21 is relatively lower than the rotation speed of the nip roller 31 (drive roller 32) in order to apply a slight tension to the web 11. .

  Next, the operation of the present embodiment having such a configuration will be described with reference to FIG.

  When the drive shaft 28 is driven to rotate, the pinion shaft 25 of the differential device 22 connected to the drive shaft 28 rotates. The rotation of the pinion shaft 25 is transmitted equally from the pair of pinion gears 24 to the feed shafts 21a and 21b via the side gears 23a and 23b, and the feed shafts 21a and 21b start to rotate at the same angular velocity (this rotation). Is called "revolution of differential gear"). Thereby, each web 11a and 11b begins to be fed from each feed shaft 21a and 21b. The fed webs 11 a and 11 b are conveyed while being held in common by the drive roller 32 and the rubber roller 33.

Here, the rolled raw sheet and 10a having a diameter r _a is a (relatively large diameter is assumed that the diameter r _b of diameter r _a and rolled raw sheet 10b of the rolled raw sheet 10a is different , and 10b a rolled raw sheet having a diameter r _b is relatively small). In this case, if the feed shaft 21a and 21b continues to rotate at a constant speed, towards the feed speed _{V a} of the web 11a is fed from a large raw sheet 10a of diameter _{r a,} small diameter _{r b} It becomes faster than the feeding speed _{Vb of the} web 11b fed from the original fabric 10b. Then, the tension of the web 11a is weakened due to excessive feeding, while the tension of the web 11b is strengthened due to insufficient feeding. This strong tension acting on the web 11b pulls the web 11b and tries to rotate the feeding shaft 21b quickly. When the rotational speed of the feeding shaft 21b is increased as much as possible, a speed difference is generated between the rotational speed of the side gear 23b and the rotational speed of the side gear 23a, and the pair of pinion gears 24 are rotated by the side gear 23b, and the side gear 23a An effect is produced in which the rotational speed, that is, the rotational speed of the feeding shaft 21a becomes slower (this rotation is referred to as “rotation of the differential device”). As a result, the excessive tension of the web 11b is suppressed, and the excessive feeding of the web 11a is suppressed, so that the necessary tension of the web 11a is maintained.

  As described above, according to the present embodiment, the difference between the angular velocities of the feeding shafts 21a and 21b on which the two roll-shaped original fabrics 10a and 10b are set can be allowed. Even when there is a difference in the diameters of the original fabrics 10a and 10b, the tension of the webs 11a and 11b can be suitably controlled. For this reason, it is possible to achieve a practical web transport apparatus capable of simultaneously feeding the webs 11a and 11b from the two roll-shaped raw fabrics 10a and 10b.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  FIG. 3 is a schematic view showing a main part of the web transport device according to the second embodiment of the present invention. In FIG. 3, the web conveyance device includes a side gear mount 26 that connects the feeding shaft 21a and the side gear 23a, and the feeding shaft 21b extends through the hollow shaft 21a. Further, with such a configuration, the differential device 22 'is provided on the same side with respect to the two feeding shafts 21a and 21b. Other configurations are substantially the same as those of the first embodiment. In FIG. 3, the same parts as those in the first embodiment shown in FIG.

  The feed shafts 21a and 21b are arranged coaxially so that a roll-shaped raw fabric 10 having various widths can be set. Further, the feeding shaft 21 a is connected to the side gear 23 a via the side gear mount 26. The feeding shaft 21b extends through the inside of the feeding shaft 21a and is connected to the side gear 23b.

  The side gear mount 26 is connected to the feeding shaft 21a at one end, wraps around the outer edge of the differential 22 ', and is connected to the side gear 23a at the other end. Further, the side gear mount 26 can transmit the rotation of the side gear 23a to the feeding shaft 21a.

  With such a configuration, since the original fabrics 10a and 10b can be set adjacent to each other, the width required for web conveyance can be reduced. That is, the entire width (size) of the web conveyance device can be reduced.

  The operation of the present embodiment having such a configuration differs from the first embodiment only in that the rotation of the feeding shaft 21a and the rotation of the side gear 23a are rotated via the side gear mount 26. It is substantially the same as the form. Therefore, detailed description is omitted.

  As described above, according to the present embodiment, there is a slight difference between the two roll-shaped raw materials by allowing the difference in angular velocity between the feeding shafts on which the two roll-shaped raw materials are set. Even in this case, the tension difference between the webs can be reduced. For this reason, the web conveyance apparatus which can be fed simultaneously from two roll-shaped original fabrics and can endure practical use is realizable.

  Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a schematic diagram showing a main part of a web conveyance device according to the third embodiment of the present invention. In FIG. 4, the web conveying device includes four feeding shafts 21a, 21b, 21c and 21d having hollow spaces, each of which roll-shaped original fabrics 10a, 10b, 10c and 10d are set, and a feeding shaft 21a. 21b and the first differential devices 22a and 22b connecting the feed shafts 21c and 21d in pairs, respectively, and the second differential device 22c disposed between the first differential device 22a and the first differential device 22b And a drive shaft 28 for rotating the four feed shafts 21a, 21b, 21c and 21d through the second differential device 22c, the first differential device 22a and the first differential device 22b. Further, the web conveying device includes a nip roller 31 that nipping and conveying the webs 11a, 11b, 11c, and 11d fed from the roll-shaped original fabrics 10a, 10b, 10c, and 10d in common.

  In FIG. 4, the same parts as those in the first embodiment shown in FIG.

  In the first differential device 22a and the first differential device 22b, the pinion shafts 25 are connected to the hollow side gears 23a "and 23b" of the second differential device 22c via the respective hollow shaft members 27. However, the other configurations are substantially the same as those of the differential device 22 in the first embodiment. On the other hand, the second differential 22c is different only in that the hollow side gears 23a "and 23b" are connected to the pinion shafts 25 of the first differential via the hollow shaft members 27. The configuration is substantially the same as that of the differential device 22 in the first embodiment.

  Each hollow shaft member 27 is connected at one end to the side gears 23a "and 23b" of the second differential 22c, passes through the hollow spaces of the hollow shafts 21b and 21c, respectively, and at the other end the first differential 22a and It is connected to the pinion shaft 25 of 22b. The rotation of the side gears 23a "and 23b" of the second differential device 22c is transmitted to the pinion shafts 25 of the first differential devices 22a and 22b via the hollow shaft members 27, and the first differential device 22a and 22b revolves at a substantially equal angular velocity.

  The drive shaft 28 is a hollow space of the four feed shafts 21a, 21b, 21c and 21d, a hollow side gear 23a and 23b of the two first differential devices 22a and 22b, and a hollow space of the second differential device 22c. It extends through the side gears 23a "and 23b". The drive shaft 28 is connected to the pinion shaft 25 ″ of the second differential device 22c so that the axes thereof are orthogonal to each other.

  Next, the operation of the present embodiment having such a configuration will be described with reference to FIG.

  When the drive shaft 28 is driven to rotate, the second differential device 22c revolves through the pinion shaft 25 ″. Thereby, the rotation of the side gears 23a ″ and 23b ″ passes through the hollow shaft member 27 to the first position. It is transmitted to the respective pinion shafts 25 of the differential devices 22a and 22b, and the first differential devices 22a and 22b start to revolve at substantially the same angular velocity.

  Here, consider a case where the tension of the web 11a is different from the tension of the web 11b. In this case, the tension required for feeding the web 11a and the tension necessary for feeding the web 11b are maintained by the action of the first differential 22a (the differential rotates). Similarly, when the tension of the web 11c is different from the tension of the web 11d, the tension required for feeding the web 11c and the tension of the web 11d are also caused by the action of the first differential 22b (the differential rotates). Each tension required for feeding is maintained. Furthermore, the tension necessary for feeding the web 11a and the web 11b maintained by the first differential 22a, the tension necessary for feeding the web 11c and the web 11d maintained by the first differential 22b, Are different from each other, the tension necessary for feeding the web 11a and the web 11b and the tension necessary for feeding the web 11c and the web 11d are respectively maintained by the action of the second differential device 22c. That is, the tension necessary for feeding the four webs 11a, 11b, 11c, and 11d is appropriately maintained.

  According to the present embodiment, the difference between the angular velocities of the feeding shafts 21a, 21b, 21c, and 21d on which the four roll-shaped original fabrics 10a, 10b, 10c, and 10d are set can be allowed. Even if there is a difference in the diameters of the roll-shaped original fabrics 10a, 10b, 10c, and 10d, the tension of each of the webs 11a, 11b, 11c, and 11d can be suitably controlled. For this reason, the web conveyance apparatus which can endure practical use which can simultaneously feed the webs 11a, 11b, 11c and 11d from the four roll-shaped original fabrics 10a, 10b, 10c and 10d can be realized.

  In the present embodiment, as shown in FIG. 4, the example in which the differential device 22 in the first embodiment is applied as the first differential devices 22 a and 22 b is shown, but the present invention is such an example. It is not limited to. FIG. 5 shows another configuration example of the first differential device according to the third embodiment of the present invention. In the example shown in FIG. 5, the differential device 22 ′ in the second embodiment is applied as the first differential devices 22 a ′ and 22 b ′.

  With such a configuration, since the original fabrics 10a and 10b and 10c and 10d can be set adjacent to each other, the width required for web conveyance can be reduced. That is, the entire width (size) of the web conveyance device can be reduced.

10, 10a, 10b, 10c, 10d Roll-shaped original fabric 11, 11a, 11b, 11c, 11d Web 20 Feeding section
21, 21a, 21b, 21c, 21d Feed shafts 22, 22 ', 22a, 22b, 22'a, 22'b Differential device (first differential device)
22c, second differential 23, 23a, 23b, 23a ", 23b" side gear 24, 24 "pinion gear 25, 25" pinion shaft 26 side gear mount 27 hollow shaft member 28 drive shaft 30 infeed part 31 nip roller 32 drive roller 33 Rubber roller 40 Printing section 50 Outfeed section 60 Winding section 500, roll-shaped original fabric 501, 501a, 501b Web 502 Feeding section 503 Infeed section 504 Printing section 505 Outfeed section 506 Winding section 510 Feeding shaft 511 Nip roller 512 Driving roller 513 Rubber roller

Claims (6)

Two feed shafts each having a hollow space on which roll-shaped raw materials are set;
A differential device in which the two feeding shafts are each connected to a hollow side gear;
A nip roller for nipping and conveying the web fed from each roll-shaped raw material in common,
A drive shaft extending through the hollow space of the two feed shafts and the hollow side gear of the differential;
With
The two feeding shafts are arranged coaxially,
A web conveyance device, wherein a pinion shaft of the differential device is connected to a drive shaft, and the pinion shaft is revolved by rotation of the drive shaft. One feed shaft extends through the hollow space of the other feed shaft,
2. The web conveyance device according to claim 1, wherein the differential device is provided on the same side with respect to the two feeding shafts. The web conveyance device according to claim 1, wherein the web conveyance device further includes a printing unit. The said web conveyance apparatus is further provided with the coating part, The web conveyance apparatus in any one of Claim 1 or 2 characterized by the above-mentioned. Four feed shafts each having a hollow space in which roll-shaped raw materials are set;
Two first differentials each paired with a pair of four feed shafts, each connected to a hollow side gear;
A second differential having a hollow shaft member disposed between the two first differentials and connected to a hollow side gear;
A nip roller for nipping and conveying the web fed from each roll-shaped raw material in common,
A drive shaft extending through the hollow space of the four feed shafts, the hollow side gears of the two first differentials and the hollow side gear of the second differentials;
With
The four feeding shafts are arranged coaxially,
Each pinion shaft of the two first differentials is connected to a hollow shaft member connected to each side gear of the second differential,
The web conveying device, wherein a pinion shaft of the second differential device is connected to a drive shaft, and each pinion shaft of the second differential device is revolved by rotation of the drive shaft. One feed shaft of each pair of feed shafts paired by each first differential device extends through the hollow space of the other feed shaft of each paired feed shaft;
6. The web conveyance device according to claim 5, wherein each of the first differential devices is provided on the same side with respect to the two feeding shafts each paired.

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