JP2016216156A - Nip roller and roller pair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nip roller which reduces replacement frequency of a rubber layer to reduce the running cost, and to provide a roller pair.SOLUTION: A nip roller 20 has a rubber layer 24 on an outer peripheral surface and is configured so as to press a sheet-like transported object W to a transport roller 10 with the rubber layer 24 and thereby transport the sheet-like transported object W in cooperation with the transport roller 10. The rubber layer 24 is formed so that its width Wbecomes smaller than a width Wof the sheet-like transported object W when viewed along an axial direction of the nip roller 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a nip roller that transports a sheet-like transported object in cooperation with a transport roller, and a roller pair that includes the nip roller.

  Conventionally, in a rotary printing press, infeed tension control using an infeed roller, a dancer roller, or the like is performed in front of the printing cylinder in order to stabilize the tension of the continuous paper fed into the printing cylinder (Patent Document 1). The in-feed roller is a metal conveyance roller that is rotationally driven by a driving unit, and is configured to convey continuous paper by this rotational force. Further, a nip roller for pressing the continuous paper against the outer peripheral surface of the infeed roller is provided in the vicinity of the infeed roller so that the rotational force of the infeed roller is reliably transmitted to the continuous paper.

  As shown in FIG. 4, the conventional nip roller 100 is a rubber roller including a metal core member 102 and a rubber layer 104 provided over the entire peripheral surface of the core member 102. It arrange | positions in parallel with the infeed roller 110 so that the outer peripheral surface of the feed roller 110 may closely_contact | adhere. In such a conventional infeed roller 110 and nip roller 100, the infeed roller 110 is rotationally driven in a state where the continuous paper W is pressed against the outer peripheral surface of the infeed roller 110 by the rubber layer 104 of the nip roller 100. Thus, the nip roller 100 is rotated in a driven manner, and the continuous paper W is conveyed in cooperation with each other. In FIG. 4, the thickness of the continuous paper W is exaggerated for easy understanding.

JP-A-10-181971

Incidentally, as shown in FIG. 4, the conventional nip roller 100 is formed so that the axial width W ₁ of the rubber layer 104 is larger than the paper width W ₂ of the continuous paper W. There are a region in contact with the continuous paper W and a region in direct contact with the outer peripheral surface of the infeed roller 110 without the continuous paper W interposed. For this reason, the conventional nip roller 100 is caused by the frictional force generated between the continuous paper W traveling when the infeed roller 110 rotates and the frictional force generated between the outer peripheral surface of the infeed roller 110. Then, the rotation follows the rotation of the infeed roller 110.

  However, since the frictional force generated between the continuous paper W and the outer peripheral surface of the infeed roller 110 is larger than the frictional force generated between the continuous paper W and the conventional nip roller 100, the region that contacts the continuous paper W. There is a problem that the rubber layer 104 is worn away before the region that does not come into contact with the continuous paper W and a step is generated in the rubber layer 104. Such a step in the rubber layer 104 causes a decrease in the force for pressing the continuous paper W against the outer peripheral surface of the infeed roller 110, which causes a lack of stability of tension control. For this reason, the conventional nip roller 100 has a problem that it is necessary to replace the rubber layer 104 when a step is generated in the rubber layer 104 before the end of the life of the rubber material itself, resulting in a running cost.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a nip roller and a roller pair that can reduce the replacement frequency of the rubber layer and suppress the running cost. It is in.

  The nip roller according to the present invention has a rubber layer on the outer peripheral surface, and is configured to convey the sheet-like conveyance object in cooperation with the conveyance roller by pressing the sheet-like conveyance object against the conveyance roller by the rubber layer. The rubber layer is configured such that the width of the rubber layer along the axial direction of the nip roller is smaller than the width of the sheet-like conveyed product along the axial direction of the nip roller. Features.

  In the nip roller according to the present invention, it is preferable that the width of the rubber layer has a length equal to or more than three-fourths of the width of the sheet-like conveyed product.

  Moreover, the nip roller which concerns on this invention WHEREIN: It is preferable that the said rubber layer has a crown shape from which an outer diameter becomes gradually small toward the both ends from the axial center part of the said nip roller.

  The roller pair according to the present invention includes a conveyance roller having a contact region on the outer peripheral surface that contacts a sheet-shaped conveyance object, and a nip roller having a rubber layer on the outer peripheral surface, and is conveyed in sheet form by the rubber layer of the nip roller The rubber roller of the nip roller is a roller pair configured such that the conveyance roller and the nip roller cooperate to convey a sheet-like conveyance object by pressing an object against the contact area of the conveyance roller, Is configured such that a width along the axial direction of the nip roller is smaller than a width of the contact area along the axial direction of the transport roller.

  ADVANTAGE OF THE INVENTION According to this invention, the exchange frequency of a rubber layer can be reduced and the nip roller and roller pair which can suppress running cost can be provided.

It is a figure which shows schematic structure of the roller pair which concerns on one Embodiment of this invention. It is the schematic which shows the state which looked at the roller pair which concerns on this embodiment from the frame side. It is a figure which shows schematic structure of the nip roller which concerns on this embodiment. It is a figure which shows schematic structure of the conventional roller pair.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

  As shown in FIGS. 1 and 2, the roller pair 1 according to the present embodiment presses the continuous paper W (sheet-like transported material) 10 and the continuous paper W against the outer peripheral surface of the transport roller 10. And a nip roller 20 to be in close contact with each other. In the roller pair 1 according to the present embodiment, the transport roller 10 is an infeed roller used for infeed tension control of a rotary printing press, and the nip roller 20 is a pressing rubber roller for the infeed roller. In FIG. 1, the paper thickness of the continuous paper W is exaggerated for easy understanding.

The conveyance roller 10 is a metal roll made of various metal materials such as iron, aluminum, and an alloy, for example. As shown in FIG. 1, a roller main body 12 having a cylindrical outer peripheral surface, and both ends of the roller main body 12. There are fixed mounting shafts 14 and 16, respectively. The roller body 12 is a metal columnar member or cylindrical member having the same diameter over the entire area in the axial direction, and the surface thereof is subjected to a durability treatment such as chrome plating. The roller body 12 has a length longer axial direction than width W ₂ of the continuous paper W to be conveyed object (width), whereby the central portion and the vicinity thereof in the axial direction of the outer peripheral surface In addition, the continuous paper W has a contact area where the continuous paper W comes into contact, and the non-contact area where the continuous paper W does not come into contact is formed at both ends in the axial direction of the outer peripheral surface and in the vicinity thereof. The attachment shafts 14 and 16 are attached to the frames F and F via bearings (not shown), respectively. The transport roller 10 is connected to driving means 18 such as a motor having one mounting shaft 16 attached to one frame F, and is driven to rotate at a predetermined peripheral speed by power transmitted from the driving means 18. It is configured as follows.

  As shown in FIG. 1, the nip roller 20 is a rubber roller including a metal core member 22 and a rubber layer 24 provided in a predetermined region on the outer peripheral surface of the core member 22. The core member 22 is a metal columnar member or cylindrical member made of various metal materials such as iron, aluminum, and an alloy, and has an axial length substantially equal to the roller body 12 of the transport roller 10. Attachment shafts 26 and 28 are fixed to both ends of the core member 22, respectively. The mounting shafts 26 and 28 are supported by moving mechanisms 30 and 32 for moving the nip roller 20 toward or away from the conveying roller 10 via bearings (not shown), respectively.

The rubber layer 24 is a substantially cylindrical rubber material, and as shown in FIG. 1, the width along the axial direction of the contact area of the transport roller 10, that is, the paper width W _{2 of the} continuous paper W to be transported. It has a short axial length (width W ₁ ). The width W _{1 in} the axial direction of the rubber layer 24 is smaller than the paper width W ₂ of the continuous paper W, and the continuous paper W cooperates with the transport roller 10 by pressing the continuous paper W against the transport roller 10 by the rubber layer 24. so long as can be conveyed to, it is possible to arbitrarily set, it width W less than ₂ of the continuous paper W, and is a 3 or more of the length of the quarter of the width W ₂ of the continuous paper W Is preferable from the viewpoint of preventing the continuous paper W from slipping. For example, if the paper web W is newsprint having a width _{W 2} of 1626mm, the width _{W 1} axial rubber layer 24 may be set to, for example, about 1219Mm～1625mm, more preferably, the sheet feeding In consideration of a part of the web side lay (± 10 mm), for example, it can be set to about 1600 mm to 1610 mm. The rubber layer 24 is attached to the outer peripheral surface of the core member 22 in a state where the axial center is aligned with the axial center of the core member 22. Accordingly, the nip roller 20 is configured such that the central portion of the core material 22 and the vicinity thereof are covered with the rubber layer 24, and both end portions and the vicinity thereof are exposed without being covered with the rubber layer 24. Has been.

  As shown in FIG. 3, the rubber layer 24 has a crown-shaped outer shape in which the outer diameter gradually decreases from the axial center portion 24a of the nip roller 20 toward both end portions 24b and 24c. The crown amount of the rubber layer 24, that is, the difference d between the radius of the rubber layer 24 at the axial center portion 24a and the radius of the rubber layer 24 at both axial ends 24b, 24c can be set as appropriate. For example, it can be set to about 0.2 mm. In FIGS. 1 and 3, the crown shape of the rubber layer 24 is exaggerated for easy understanding.

  As shown in FIGS. 1 and 2, the nip roller 20 is supported by the moving mechanisms 30 and 32 attached to the frames F and F, so that the attachment rollers 26 and 28 are supported in the vicinity of the conveyance roller 10. Are arranged in parallel. As shown in FIG. 2, each of the moving mechanisms 30 and 32 includes a sub frame 34 that supports the nip roller 20, and an air cylinder 38 that swings the sub frame 34 about a shaft 36. The moving mechanisms 30, 32 swing the sub-frame 34 with the air cylinder 38, thereby pressing the outer peripheral surface of the transport roller 10 with the rubber layer 24 of the nip roller 20, and the nip roller 20. The nip roller 20 is configured to approach or separate from the conveyance roller 10 between the rubber layer 24 and the retracted position separated from the outer peripheral surface of the conveyance roller 10. The moving mechanisms 30 and 32 can employ various known configurations in addition to the above configuration.

  As shown in FIGS. 1 and 2, the roller pair 1 according to the present embodiment having the above-described configuration sandwiches the continuous paper W between the transport roller 10 and the nip roller 20 positioned at the pressing position, and the nip roller 20 In the state where the continuous paper W is pressed against the contact area of the outer peripheral surface of the transport roller 10 by the rubber layer 24, the transport roller 10 is driven to rotate, whereby the nip roller 20 is driven and cooperates with each other. The continuous paper W is configured to be conveyed. At this time, the nip roller 20 is not in direct contact with the transport roller 10, but only by the frictional force generated between the continuous paper W, that is, the driving force of the transport roller 10 is transmitted only through the continuous paper W. To rotate in a passive manner.

As described above, the nip roller 20 according to the present embodiment has the rubber layer 24 on the outer peripheral surface, and the continuous paper W (sheet-like transported material) is pressed against the transport roller 10 by the rubber layer 24, whereby the transport roller 10. It is configured to convey the paper web W in cooperation with, and is configured such that the width W ₁ of the rubber layer 24 along the axial direction of the nip roller 20 is smaller than the width W ₂ of the continuous paper W. According to such a nip roller 20, since the entire surface of the rubber layer 24 can be brought into contact with the continuous paper W without being in direct contact with the outer peripheral surface of the conveying roller 10, the entire rubber layer 24 is uniformly worn. It becomes possible. Since the rubber layer 24 as a whole is uniformly worn in this way, the nip roller 20 according to the present embodiment does not cause the step difference of the rubber layer 104 that has occurred in the conventional nip roller 100. In addition, the service life of the rubber layer 24 can be extended, that is, the replacement frequency of the rubber layer 24 can be reduced as compared with the conventional one, thereby reducing the running cost.

  In the nip roller 20 according to the present embodiment, the rubber layer 24 has a crown shape in which the outer diameter gradually decreases from the axial center portion 24a of the nip roller 20 toward both end portions 24b and 24c. According to the nip roller 20 having such a shape, the continuous paper W can be pressed while being stretched in the paper width direction, so that generation of wrinkles can be suppressed and registration of the entire paper width is facilitated. . Further, according to the nip roller 20 having such a shape, the nip width and the nip pressure in the paper width direction (the axial direction of the nip roller 20) of the continuous paper W can be made uniform. Can be secured over a long period of time. That is, since the nip roller is generally configured to press the transport roller with a force acting on the mounting shafts at the left and right ends, the nip roller is caused by the reaction force from the transport roller applied to the rubber layer of the nip roller. Will bend slightly. For this reason, when the rubber layer of the nip roller has a straight shape with the same diameter over the entire area in the axial direction, the nip width (nip pressure) at the center in the axial direction is the nip width at both ends in the axial direction. This is narrower (weaker) than (nip pressure), which may lead to unstable tension control. In contrast, in the nip roller 20 according to the present embodiment, since the rubber layer 24 has a crown shape, even when the nip roller 20 is bent, the nip width of the central portion 24a in the axial direction and A sufficient nip pressure can be secured, whereby the nip width and the nip pressure in the paper width direction of the continuous paper W can be made uniform.

  Further, the rubber material and the rubber hardness forming the rubber layer 24 can be arbitrarily selected or set. However, in the nip roller 20 according to the present embodiment, no step is generated in the rubber layer 24 as described above. A rubber material softer than the conventional rubber layer 104, for example, a rubber material having a rubber hardness (JIS-A hardness) of about 70 to 75 and a relatively low rubber hardness and excellent gripping force can be employed.

  The preferred embodiment of the present invention has been described above, but the technical scope of the present invention is not limited to the scope described in the above-described embodiment. Various modifications or improvements can be added to the above embodiments.

  For example, in the description of the embodiment described above, the transport roller 10 is an infeed roller used for infeed tension control of a rotary printing press, the nip roller 20 is a pressing rubber roller for the infeed roller, and is in a sheet form. Although the conveyed product was demonstrated as what is the continuous paper W, it is not limited to this. For example, the conveyance roller 10 according to the present embodiment may be a sheet feeding roller or drum of a sheet-like paper in a copying machine, a printer, a facsimile machine, an automatic deposit machine (ATM), a ticket machine, etc. It is good also as a conveyance roller for conveying sheet-like objects, such as a plastic film, cloth, and foil. Further, the nip roller 20 according to the present embodiment may be various rubber rollers used together with the paper feed roller, the drum, the transport roller, and the like. Further, as is clear from this, the sheet-like transported object to be transported by the roller pair 1 according to the present embodiment is not limited to continuous paper, for example, sheet-like paper, plastic film, cloth, and the like Various sheet-like materials such as foil are included.

  Further, in order to ensure the uniformity of the nip width and the nip pressure, the rubber layer 24 of the nip roller 20 preferably has a crown shape, but the present invention is not limited to this, and the rubber layer of the nip roller has an axial direction. It is good also as a straight shape which becomes the same diameter over the whole region.

  Further, although not particularly mentioned in the description of the above-described embodiment, the rubber layer 24 of the nip roller 20 may be subjected to various processes. For example, a spiral groove (not shown) from the central portion 24a in the axial direction to the left and right end portions 24b and 24c may be formed on the surface portion of the rubber layer 24. In this case, the spiral groove is preferably formed symmetrically about the axial central portion 24a, and the nip roller 20 extends from the axial central portion 24a toward the left and right end portions 24b, 24c. It is preferable that the groove extends in the direction opposite to the rotation direction. By forming such a spiral groove on the surface portion of the rubber layer 24, generation of wrinkles of the continuous paper W can be further suppressed.

1 roller pair, 10 transport roller, 12 roller body, 14, 16 mounting shaft, 18 driving means, 20 nip roller, 22 core material, 24 rubber layer, 24a central portion, 24b, 24c both ends, 26, 28 mounting shaft, 30, 32 moving mechanism, 34 sub-frame, 36 axis, 38 air cylinder, F frame, W continuous paper (sheet-like conveyed product), width of W ₁ rubber layer, width of W ₂ continuous paper (sheet-like conveyed product)

Claims (4)

A nip roller configured to have a rubber layer on the outer peripheral surface and to convey the sheet-like conveyed product in cooperation with the conveyance roller by pressing the sheet-like conveyed item against the conveying roller by the rubber layer,
The nip roller, wherein the rubber layer is configured such that a width along an axial direction of the nip roller is smaller than a width of a sheet-like conveyed product along the axial direction of the nip roller. The nip roller according to claim 1,
The nip roller, wherein the width of the rubber layer has a length equal to or more than three quarters of the width of the sheet-like conveyance object. The nip roller according to claim 1 or 2,
The nip roller, wherein the rubber layer has a crown shape in which an outer diameter gradually decreases from an axial center portion to both end portions of the nip roller. A conveyance roller having a contact area on the outer peripheral surface, and a nip roller having a rubber layer on the outer peripheral surface; and the contact of the conveyance roller with the rubber layer of the nip roller. A roller pair configured to convey the sheet-like conveyance object in cooperation with the conveyance roller and the nip roller by pressing against a region,
The rubber layer of the nip roller is configured such that a width along the axial direction of the nip roller is smaller than a width of the contact area along the axial direction of the transport roller. versus.

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