JP5475368B2 - Sheet material guide roll device - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material guide roll device that supports a sheet-like processed material (hereinafter referred to as a sheet material) such as a film so as to be able to travel, and in particular, a guide roll member for the traveling speed of the sheet material. The present invention relates to a sheet material guide roll device that improves the followability of the rotation speed and prevents the sheet material from being damaged.

  Conventionally, when a sheet material is conveyed to various apparatuses, a sheet material guide roll device is used for the purpose of applying tension to the sheet material. The sheet material guide roll device includes a cylindrical guide roll member on which the sheet material travels on an outer peripheral portion, a support shaft inserted in the guide roll member, and a bearing that rotatably supports the support shaft. It is configured. In general, a rolling bearing is used as the bearing.

  As a guide roll device for a sheet material using a rolling bearing, a conductive annular member fixed to a guide roll member, and an S pole and an N pole fixed to a drive shaft are alternately arranged via a ball bearing. By arranging the magnet ring member provided facing each other, the guide roll member can follow the change in the traveling speed of the sheet material by using the magnetic flux generated between the annular member and the magnet ring member. Have been proposed (see, for example, Patent Document 1).

  Further, as a guide roll device for a sheet material using a sliding bearing, by using a gas bearing, the guide roll member can be rotated only by a sliding frictional force received from the sheet material, and the guide roll member is rotated. A device that does not require a drive source has been proposed (see, for example, Patent Document 2).

JP-A-8-12150 (paragraphs 0015 and 0046, FIG. 3) Japanese Unexamined Patent Publication No. 7-285719 (paragraphs 0017 and 0042, FIG. 1)

  However, in the sheet material guide roll device according to Patent Document 1, rolling resistance is generated by friction between the ball bearing and the support shaft, so that the rotational speed of the guide roll member cannot follow the traveling speed of the sheet material. Therefore, in the sheet material guide roll device according to Patent Document 1, it is necessary to compensate for the rotation of the guide roll member using a drive source such as a motor, which complicates the drive mechanism.

  In recent years, a guide roll device for a sheet material that eliminates a driving source by reducing rolling resistance has been developed. However, even in a guide roll device for a sheet material that does not require a drive source, since rolling resistance always occurs, the rotation speed of the guide roll member may not follow the traveling speed of the sheet material, and the sheet material and the guide roll member Rubs and scratches the sheet material.

  In the sheet material guide roll device according to Patent Document 2, since the gas bearing has a lower bearing rigidity than the other bearings, the deflection (deflection) due to the weight of the guide roll member cannot be corrected. For this reason, in the sheet material guide roll device according to Patent Document 2, particularly when the guide roll member is long, the bearing gap (gap) cannot be maintained, and the guide roll member becomes defective in rotation.

  Further, in the sheet material guide roll device according to Patent Document 2, for example, when a guide roll member whose straightness has been distorted due to bending is rotated, a so-called jump rope phenomenon (here, when the guide roll member makes one rotation, it is bent every half rotation). And the angle between the guide roll member and the support shaft changes, so that the bearing gap cannot be maintained, and the guide roll member is not rotating properly. Become.

  Further, in recent years, as a result of increasing the functionality of the sheet material, even the scratches that have not been particularly problematic in the past have deteriorated the yield.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sheet material guide roll device that solves the above-described problems, improves the followability of the rotational speed of the guide roll member with respect to the traveling speed of the sheet material, and prevents the sheet material from being damaged. And

  In order to solve the above-mentioned problem, in the invention according to claim 1, gas bearings that rotatably support the support shaft are provided at both ends of the guide roll member, and the first elastic body is annularly formed on the inner peripheral surface of the gas bearing. It was made to provide. Further, a gap is provided between the non-bearing end face of the gas bearing and the guide roll member, and the second elastic body is provided in this gap.

  According to the first aspect of the present invention, since the first elastic body is annularly provided on the inner peripheral surface of the gas bearing, for example, the guide roll member is bent by its own weight, and the angle between the guide roll member and the support shaft is When it changes, the first elastic body is deformed, and the bearing member can be tilted with respect to the support shaft (this movement is called that the bearing member shakes the neck). That is, by deforming the first elastic body, the angle between the bearing member and the support shaft can be continuously changed following the change in the angle between the guide roll member and the support shaft. As described above, since the gas bearing is provided with the swing mechanism, even if the guide roll member is bent, the radial bearing gap can be kept at an optimum interval while keeping the radial bearing surface parallel to the guide roll member.

  Further, according to the first aspect of the present invention, the gap is provided between the non-bearing end face of the gas bearing and the guide roll member, and the second elastic body is provided in the gap. When the guide roll member is bent by its own weight and the guide roll member is pulled to the center in the thrust direction, the second elastic body is deformed, and the gap between the non-bearing end surface of the gas bearing and the guide roll member is changed to the center in the thrust direction. Can be expanded by the amount moved. As described above, since the buffer mechanism is provided between the end face of the gas bearing and the guide roll member, even if the guide roll member bends in cooperation with the swing mechanism, the thrust bearing surface is kept at a right angle with the guide roll member. The bearing gap in the thrust direction can be kept at an optimum interval.

  As described above, according to the first aspect of the present invention, the gas bearing including the first elastic body and the second elastic body is provided at both ends of the guide roll member. With the buffer mechanism, the guide roll member can be automatically aligned with respect to the bending. As a result, the bearing gap in the radial direction and the thrust direction can be maintained in parallel and at an optimum interval, and the non-contact state can be maintained, so that the guide roll member can be stably rotated even in the case of a gas bearing. .

  As a result, according to the invention which concerns on Claim 1, since friction resistance is lose | eliminated by using a gas bearing, the followability of the rotational speed of the guide roll member with respect to the travel speed of a sheet | seat material can be improved. As a result, since the speed difference between the sheet material and the guide roll member can be eliminated, the sheet material and the guide roll member can be prevented from being scratched, and the sheet material can be prevented from being damaged, thereby improving the yield and quality. Can do.

  In addition to these, as a characteristic effect of the gas bearing, maintenance is easy because there is no need for lubrication unlike a rolling bearing, and there is no wear due to friction like a rolling bearing, and the service life is also long.

1 is an overall perspective view of a guide roll device according to the present invention. It is a principal part disassembled perspective view of the guide roll apparatus which concerns on embodiment. It is principal part sectional drawing of the guide roll apparatus which concerns on embodiment. It is sectional drawing which shows the mode of the self-alignment of the guide roll apparatus which concerns on embodiment.

  First, a basic matter of creation of the present invention will be briefly described. The inventor believes that if a gas bearing can be used as the bearing of the guide roll device, the followability of the rotational speed of the guide roll member with respect to the traveling speed of the sheet material can be improved without using a driving source. However, if the bearing rigidity is not high enough to correct the deflection of the guide roll member, the application of the gas bearing to the guide roll apparatus has been studied by mechanically compensating for the low bearing rigidity.

  The inventor is generally considered that the gas bearing cannot correct the deflection of the guide roll member and cannot stably rotate the guide roll member. Therefore, the bearing member is provided with a swing mechanism and a buffer mechanism. Thus, it has been found that the low bearing rigidity can be compensated, and the present invention has been created.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is an overall perspective view of a guide roll device according to the present invention.

  As shown in FIG. 1, the guide roll device 1 is a cylindrical guide roll member 2 on which the sheet material S travels on the outer periphery, a support shaft 3 inserted in the guide roll member 2, and the support shaft 3. And a gas bearing 4 that is freely supported.

  The guide roll device 1 is configured so that compressed gas is supplied to the gas bearing 4 from a compressed gas supply source such as a compressor (not shown) via the tube 5 so that the gas bearing 4 holds the support shaft 3 in a non-contact state. It is configured. In the guide roll device 1, for example, when the sheet material S is conveyed in the arrow direction, the guide roll member 2 rotates in synchronization with the traveling speed of the sheet material S by the frictional force received from the sheet material S. The sheet material S is conveyed to various apparatuses while applying tension to the sheet material S.

  FIG. 2 is an exploded perspective view of a main part of the guide roll device 1 according to the embodiment, and is an exploded perspective view of the gas bearing 4 disposed at the left end portion of the guide roll device 1 shown in FIG.

  As shown in FIG. 2, the gas bearing 4 includes an inner cylinder 41, an outer cylinder 42, and a flange 43 disposed on one end face thereof.

  The inner cylinder 41 is a cylindrical member, and has a radial bearing surface 41a made of a porous material on the outer peripheral surface thereof, and a thrust bearing surface made of a porous material on one end face thereof, here, an end face on the guide roll member 2 side. 41b is formed. The inner cylinder 41 has a compressed gas supply hole for supplying compressed gas to the radial bearing surface 41a and the thrust bearing surface 41b on an end surface where the thrust bearing surface 41b is not formed (hereinafter referred to as a non-bearing end surface 41c). 41d is formed.

  The inner cylinder 41 is provided with a first elastic body 6, in this case an O-ring 6, in the center of the inner cylinder 41. The inner cylinder 41 is provided with a plurality of second elastic bodies 7, here, springs 7 on the non-bearing end face 41c over the circumference of the non-bearing end face 41c.

  The outer cylinder 42 is a cylindrical member, and is configured to face the radial bearing surface 41a formed on the inner cylinder 41 with a bearing gap.

  The flange 43 is a collar-shaped member and is configured to face the thrust bearing surface 41b formed on the inner cylinder 41 with a bearing gap.

  The gas bearing 4 configured as described above is generally inserted into the guide roll member 2, specifically the both ends of the guide roll body 21, with the inner cylinder 41, the outer cylinder 42, and the flange 43 assembled. Then, the lid is covered with a guide roll lid (lid) member 22 and attached to the guide roll body 21.

  The guide roll lid member 22 is a ring-shaped member that constitutes the guide roll member 2, and passes a tube 5 (see FIG. 1) for supplying compressed gas to a compressed gas supply hole 41 d provided in the inner cylinder 41. For this purpose, a notch-shaped joint hole 22a is formed. The guide roll lid member 22 is fixed to the support shaft 3 while facing the non-bearing end surface 41c with a gap.

  FIG. 3 is a cross-sectional view of the main part of the guide roll device 1 according to the embodiment. The swing mechanism and the buffer mechanism provided in the gas bearing 4 provided at the left end of the guide roll device 1 shown in FIG. It is sectional drawing shown. Moreover, FIG. 4 is sectional drawing which shows the mode of the self-alignment of the guide roll apparatus 1 which concerns on embodiment.

  As shown in FIG. 3, the gas bearing 4, which is a main part of the guide roll device 1 according to the embodiment, has a swing mechanism on the inner peripheral surface of the gas bearing 4, more specifically, the inner periphery of the inner cylinder 41. The first elastic body 6, here the 0 ring 6, is provided in the center of the inner cylinder 41 in a ring shape on the surface.

  Further, as the buffer mechanism, a gap is provided between the non-bearing end surface 41c and the guide roll member 2, more specifically, between the non-bearing end surface 41c and the guide roll lid member 22, and the second elastic member is provided in the gap. The body 7, here, the spring 7 is inserted into a concave portion formed on the non-bearing end face 41c.

  In the guide roll device 1 configured as described above, as shown in FIG. 4, the guide roll member 2 is bent by its own weight, and deviates from a right angle direction in a direction in which the angle between the guide roll member 2 and the support shaft 3 changes. When the force is applied in the opposite direction, the O-ring 6 and the springs 7a and 7b are deformed by the force, and the gap between the radial bearing surface 41a and the outer cylinder 42 and the gap between the thrust bearing surface 41b and the flange 43 are parallel and optimal. To be kept.

  More specifically, for example, when the guide roll member 2 is bent downward, a force is applied to the left end portion of the guide roll member 2 and the gas bearing 4 in the direction indicated by the arrow. At this time, the O-ring 6 is crushed by the applied force while sliding in the direction indicated by the arrow.

  At this time, since the gap between the non-bearing end surface 41c and the guide roll lid member 22 is widened, the spring 7a is weakened and stretched. On the other hand, since the gap between the non-bearing end surface 41c and the guide roll lid member 22 is narrowed, the spring 7b has an increased compressive force and contracts.

  In this way, the O-ring 6 is deformed while sliding, and the springs 7 a and 7 b expand and contract so as not to hinder the movement of the inner cylinder 41. Then, the inner cylinder 41 continuously moves so as to swing the head following the change in the angle between the guide roll member 2 and the support shaft 3. As a result, the gap between the radial bearing surface 41a and the outer cylinder 42 is maintained in parallel and at an optimum interval.

  Further, while the spring 7a is extended, the spring 7b is contracted, and the inner cylinder 41 is continuously urged toward the thrust bearing surface 41b. As a result, the gap between the thrust bearing surface 41b and the flange 43 is kept parallel and at an optimum interval.

  Further, when the guide roll member 2 is bent, the guide roll member 2 is pulled to the center in the thrust direction. At this time, since the gap between the non-bearing end surface 41c and the guide roll lid member 22 is widened, the spring 7 is weakened and stretched. The spring 7 continues to urge the inner cylinder 41 toward the thrust bearing surface 41b while extending. As a result, the gap between the thrust bearing surface 41b and the flange 43 is kept parallel and at an optimum interval.

  In the guide roll device 1 according to the embodiment of the present invention, even when the guide roll member 2 is bent, the gap between the radial bearing surface 41a and the outer cylinder 42 and the gap between the thrust bearing surface 41b and the flange 43 are parallel and at an optimum interval. Since it is maintained, the guide roll member 2 rotates stably.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, the first elastic body 6 according to the present invention is not limited to the O-ring, and may be a spring. Furthermore, a spherical seat that plays the same role as the elastic body may be used. The second elastic body 7 according to the present invention is not limited to a coil spring, and may be a leaf spring. In addition to the spring, rubber may be used.

  In the present invention, the non-bearing end surface 41c refers to the end surface of the inner cylinder 41 on the side where the thrust bearing surface 41b is not formed.

  In this invention, between the non-bearing end surface 41c and the guide roll member 2 means between the non-bearing end surface 41c and the guide roll lid member 22.

  In this invention, the guide roll member 2 being bent includes not only the case where the guide roll member 2 is bent but also the case where both the guide roll member 2 and the support shaft 3 are bent. In general, the guide roll member 2 and the support shaft 3 have different bending conditions, so that the angle between the guide roll member 2 and the support shaft 3 changes.

DESCRIPTION OF SYMBOLS 1 Guide roll apparatus 2 Guide roll member 21 Guide roll main body 22 Guide roll cover member 3 Support shaft 4 Gas bearing 41 Inner cylinder 41a Radial bearing surface 41b Thrust bearing surface 41c Non-bearing end surface 42 Outer cylinder 43 Flange 6 First elastic body ( O-ring)
7 Second elastic body (spring)

Claims (1)

A guide roll member having a cylindrical guide roll main body on which a sheet material travels on an outer peripheral portion, a guide roll lid member fixed to a support shaft and disposed in an opening of the guide roll main body, and inserted into the guide roll member In a sheet material guide roll device provided with a supporting shaft,
The guide roll member includes gas bearings that are rotatable with respect to the support shaft at both ends thereof,
A first elastic body is provided annularly on the inner peripheral surface of the gas bearing,
A sheet material guide roll device, wherein a gap is provided between a non-bearing end face of the gas bearing and the guide roll lid member, and a second elastic body is provided in the gap.

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