JP2006349100A - Bearing structure of roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing structure of a highly accurate roll used for a coating device. <P>SOLUTION: Two angular bearings 18 and 20 are mounted on a rotary shaft 12 of the roll 10, and a first penetrating space 30 through which the rotary shaft 12 is passed is formed in a pair of bearings 28 and 29. The inside of the first penetrating space 30 is formed in a spherical shape, and a housing 32 with a spherical surface is fitted in the first penetrating space 30. A second cylindrical penetrating space 34 through which the rotary shaft 12 is passed is formed in the housing 32, and the angular bearings 18 and 20 are fitted in the second penetrating space 34. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a roll bearing structure in a coating apparatus.

  In a coating roll for coating a coating liquid on a web such as a film, it is necessary to improve the accuracy of the coating thickness, and for this purpose, the rotational accuracy of the roll is required.

  For example, in rolls used in rolling mills in other fields, in order to increase the rotation accuracy, the center of rotation of the crossing work roll is set as one roll choke, and thrust force support that receives thrust force in this roll choke is supported. A mechanism provided with a mechanism has been proposed (see Patent Document 1).

  In the thrust force holding mechanism configured as described above, the convex partial cylindrical surface is fitted into the concave partial cylindrical surface, and the rotation shaft is rotatably fitted to a member having the convex partial cylindrical surface.

However, even if the technique of Patent Document 1 is used, the accuracy is 1 mm or more, and it cannot be directly applied to a coating roll for coating a coating liquid on a web such as a film.
FIG. 4 of Japanese Patent Laid-Open No. 8-197109

  By the way, the coating thickness of a web such as a film is about 100 μm, for example, and the rotational accuracy is about 3 μm. However, the accuracy of the coating roll conventionally used in the coating apparatus is about 8 to 10 μm, and cannot meet the above requirement of 3 μm.

  In view of the above problems, the present invention provides a highly accurate roll bearing structure in a coating apparatus.

  The invention according to claim 1 is a roll bearing structure in which the roll is rotatably supported by a pair of bearings, and an inner ring of an angular bearing is fixed to each of the rotating shafts protruding from both ends of the roll, Each of the pair of bearings is formed with a first through space through which the rotating shaft passes, and the inside of the pair of first through spaces is formed in a spherical shape, and the pair of first through spaces has a spherical body. The housings are respectively fitted, and the housings are rotatable inside the first through space, and the pair of housings are respectively formed with cylindrical second through spaces through which the rotating shaft passes, In the second through space of the pair of housings, outer rings of the angular bearings are fitted, respectively.

  The invention according to claim 2 is characterized in that the angular bearings are arranged in contact with each other in two rows along the axial direction of the roll, and the inner rings of the two rows of angular bearings are tightened in a direction in which they approach each other. The bearing structure for a roll according to claim 1.

  According to a third aspect of the present invention, an outer ring of the angular bearing in one of the pair of bearings is fixed so as not to move in the axial direction with respect to the second through space. 2. The roll bearing structure according to claim 1, wherein an outer ring of the angular bearing in the other bearing is fixed so as to be movable in the axial direction with respect to the second through space.

  The invention according to claim 4 is the bearing structure for a roll according to claim 2, wherein the contact position of the two rows of angular bearings coincides with the central axis of the housing of the spherical body.

  The invention according to claim 5 is the roll bearing structure according to claim 1, wherein the roll is a coating roll in a coating apparatus for coating a web with a coating liquid.

  The invention according to claim 6 is the roll bearing structure according to claim 1, wherein the roll is a transport roll for transporting the web in a coating apparatus for coating a web with a coating liquid. .

  With the roll bearing structure of the present invention, even if the housing rotates inside the first through space and the rotating shaft tilts due to its own weight, the shake can be absorbed. Further, in this case, since the rotary shaft is rotatably attached to the housing by the angular bearing, play in the axial direction is eliminated and high-precision rotation can be performed.

  Hereinafter, the bearing structure of the roll 10 according to an embodiment of the present invention will be described.

(1) Configuration of Roll 10 The roll 10 is used for a coating roll for coating a coating liquid on a web such as a film or a fabric, and particularly for a coating apparatus that requires an ultra-thin coating. It is used.

  The rotating shaft 12 protrudes from both ends of the roll 10. Between the rotating shaft 12 and the roll 10, a cylindrical mounting portion 14 having a diameter slightly larger than the rotating shaft 12 and smaller than the roll 10 is provided. Thereby, a step portion 16 is formed between the attachment portion 14 and the rotating shaft 12.

  Inner rings of two angular bearings 18 and 20 are fixed to the rotary shaft 12. The angular bearings 18 and 20 have a cylindrical shape on one side of the groove of the outer ring, and can contain many balls. The contact points of the balls are inclined from a plane perpendicular to the axis, and large thrust loads in one direction are also possible. The angular bearing 18 and the angular bearing 20 are mounted in opposite directions, and radial play is eliminated by preliminarily applying a prestress in the axial direction. As a structure that eliminates this radial play, a cylindrical spacer 22 is interposed between the inner ring of the angular bearing 18 and the step portion 16, and the outer angular bearing 20 is inward by a cylindrical fixing member 24. It is pressed. The fixing member 24 is fixed to the rotating shaft 12 by a nut 26, and the angular bearing 20 is thereby pressed toward the angular bearing 18 side. And since the angular bearing 18 is being fixed by the step part 16 and the spacer 22, the two angular bearings 18 and 20 are pressed and fixed in the direction which approaches mutually.

  A pair of bearings 28 and 29 that support the roll 10 is provided with a first through space 30 through which the rotary shaft 12 passes. The inside of the first through space 30 is formed in a spherical shape.

  A spherical housing 32 is fitted in the first through space 30. The outer peripheral surface of the housing 32 is formed so as to coincide with the inner peripheral surface of the first through space 30, and the housing 32 is rotatable inside the first through space 30.

  The housing 32 is provided with a cylindrical second through space 34 through which the rotary shaft 12 passes. The outer rings of the angular bearings 18 and 20 are fitted in the second through space 34. The contact positions of the angular bearings 18 and 20 coincide with the central axis of the spherical housing 32.

  Here, the bearing 28 on the driving side that is directly connected to the motor 46 that rotates the roll 10 in the pair of bearings 28 and 29 will be described. A connecting shaft 36 further protrudes from the end of the rotating shaft 12 to the drive-side bearing 28 in order to connect to the motor 46. A key 38 for connecting to the motor 46 projects from the connecting shaft 36.

  Holding members 40 are provided on both sides of the housing 32, and bearings 42 and 44 are provided on the inner peripheral side of the holding member 40, respectively, and are in contact with the rotating shaft 12 and the mounting portion 14 so as to be rotatable. The holding member 40 is fixed so that the outer rings of the angular bearings 18 and 20 do not move in the axial direction.

  On the other hand, in the bearing 29 on the other side opposite to the bearing 28 on the driving side, the connecting shaft 36 described above is not provided, and the outer rings of the angular bearings 18 and 20 can be moved somewhat in the axial direction. Is provided.

(2) Rotation state of roll 10 The operation state of the bearing structure of the roll 10 having the above configuration will be described.

  When the roll 10 is attached to the bearings 28 and 29, as shown in FIG. 3, the central portion of the roll 10 is lowered by its own weight, and the rotary shaft 12 is swung from a horizontal state. In this case, even if the rotating shaft 12 is shaken, the roll 32 can be rotatably supported because the housing 32 rotates inside the first through space 30. And the angular bearings 18 and 20 can be rotated without stress.

  Even if the mounting positions of the rotary shafts 12 and 12 at both ends of the roll 10 are slightly shifted, the shift can be absorbed by the rotation of the housing 32.

  Furthermore, since the rotating shaft 12 is rotatably attached to the second through space 34 of the housing 32 by the angular bearings 18 and 20, the roll 10 rotates but does not deviate from the axial direction with high accuracy. Can rotate. In particular, since the contact positions of the angular bearings 18 and 20 coincide with the central axis of the housing 32, even if the housing 32 rotates, the contact positions of the angular bearings 18 and 20 are not shifted and the rotation accuracy is maintained. can do. Further, no gap is generated between the angular bearings 18 and 20.

  With this bearing structure of the roll 10, the runout accuracy of the roll 10 can be 3 μm or less, and even when the coating liquid is applied to the film with an ultra-thin film, the coating liquid can be applied uniformly. it can.

(Application examples)
With the support structure of the roll 10 of this embodiment, even if the roll 10 has a structure that is detachable from the coating apparatus, the accuracy can be maintained. That is, even when the assembly accuracy of the coating apparatus is low and there is an accuracy error when it is attached, high rotational accuracy can be obtained by the functions of the housing 32 and the angular bearings 18 and 20.

(Example of change)
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof.

  For example, in the above-described embodiment, the roll 10 has been described as a coating roll.

  Further, although the contact positions of the angular bearings 18 and 20 are made coincident with the central axis of the housing 32, they may be shifted in the axial direction.

  The bearing structure of the roll of the present invention is suitable for a coating apparatus that coats a coating liquid on a film or the like with an ultra-thin film.

It is a longitudinal cross-sectional view of the bearing which shows one Embodiment of this invention. It is a longitudinal cross-sectional view of two angular bearings. It is explanatory drawing which shows the whole structure of a roll.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Roll 12 Rotating shaft 14 Mounting part 16 Step part 18 Angular bearing 20 Angular bearing 22 Spacer 24 Fixing member 26 Pin 28 Bearing 29 Bearing 30 1st penetration space 32 Housing 34 2nd penetration space

Claims (6)

A roll bearing structure in which a roll is rotatably supported by a pair of bearings,
An inner ring of an angular bearing is fixed to each of the rotating shafts protruding from both ends of the roll,
Each of the pair of bearings is formed with a first through space through which the rotating shaft passes,
The insides of the pair of first through spaces are each formed in a spherical shape,
A spherical housing is fitted in each of the pair of first through spaces, and the housing is rotatable inside the first through space,
The pair of housings are respectively formed with cylindrical second through spaces through which the rotation shaft passes,
The roll bearing structure, wherein an outer ring of the angular bearing is fitted in the second through space of the pair of housings. The angular bearings are arranged in contact in two rows along the axial direction of the roll,
The roller bearing structure according to claim 1, wherein the inner rings of the two rows of angular bearings are tightened in a direction in which the inner rings approach each other. An outer ring of the angular bearing in one of the pair of bearings is fixed so as not to move in the axial direction with respect to the second through space,
The roller bearing according to claim 1, wherein an outer ring of the angular bearing in the other bearing of the pair of bearings is fixed so as to be movable in the axial direction with respect to the second through space. Construction. The roller bearing structure according to claim 2, wherein a contact position of the two rows of angular bearings coincides with a central axis of the spherical body housing. The bearing structure for a roll according to claim 1, wherein the roll is a coating roll in a coating apparatus that coats a web with a coating liquid. The bearing structure for a roll according to claim 1, wherein the roll is a transport roll for transporting the web in a coating apparatus that coats a web with a coating liquid.

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