JP2008074520A - Turn bar and method for changing travelling direction of band-like body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turn bar preventing occurrence of scratches or wrinkles on a surface of a band-like body even if high tensile force is applied to the band-like body travelling at high speed, in a turn bar changing the travelling direction of band-like body, and to provide a method for changing the travelling direction of band-like body. <P>SOLUTION: The turn bar comprises a turn bar body 7 and balls 3 loosely fitted in a plurality of holes 4 formed on an outer peripheral surface part 7a of the turn bar body 7. A circumference of the opening part is narrowed to prevent a ball from falling down, and a part of ball is exposed to the outside from the opening part of the hole, and the ball is rotatably held. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a turn bar for changing the traveling direction of various strips such as a traveling resin film, paper, woven fabric, nonwoven fabric, metal foil, and metal thin plate, and a method for changing the traveling direction of the strip.

  Conventionally, in the process of handling various strips such as resin film, paper, woven fabric, non-woven fabric, metal foil, thin metal plate (production of various strips, slit cutting, rotary printing, surface treatment, etc.) Conversion (including front and back conversion) is taking place. This change in the direction of travel is performed by winding the turn bar against the traveling belt in contact with a desired angle. The turn bar can be used for the time being if it is a substantially cylindrical rotating shaft body with a smooth surface or a non-rotating shaft body.

  However, in the method in which the surface of the turn bar and the traveling strip are in contact, the print is applied to the strip, when it is relatively soft, or when it is sticky and has a large friction coefficient, the turn bar and the strip are There was a problem that scratches and wrinkles were likely to occur due to friction with the surface. In addition, the belt-like body running at a high speed has a problem of meandering that the belt-like body deviates from a normal path (passage path) when the tension is loose. On the other hand, when the tension is increased, the contact pressure between the belt-like body and the turn bar increases, so that scratches and wrinkles are likely to occur.

  As a countermeasure against these problems, for example, Patent Document 1 discloses a method in which the belt-like body and the turn bar surface are not in contact with each other. That is, in order to avoid contact between the turn bar and the belt-like body, the turn bar is a hollow cylindrical drum, a large number of through holes are provided on the peripheral surface, compressed air is blown out from the inside of the cylindrical drum, and the belt-like body is floated to be in a non-contact state. It is trying to become. As shown in FIG. 9A, the belt-like body 1 is wound around the hollow cylindrical drum 30 in the direction of the arrow to change the traveling direction by 90 ° (angle), and the front and back are reversed. In this method, even if the strip is relatively soft, wet or sticky, there is no contact with the turn bar, so the frictional force that causes wrinkle-like wrinkles with extended ears (ends) The direction can be changed stably without being affected by extraneous external forces. However, there is a problem that an air compressor and piping connection are required as incidental facilities for jetting compressed air, and that maintenance management such as clogging of the small jet port 31 and cleaning care is troublesome.

  Furthermore, for example, Patent Document 2 is disclosed as a method of bringing the belt-shaped body into contact with the surface of the turn bar. In this method, as shown in FIG. 9B, a large number of rotating rollers (41, 42) are embedded in a portion where the belt-like body 1 comes into contact with the turn bar. Each rotating roller changes the embedment angle corresponding to the traveling direction of the belt-shaped body that is in contact. That is, the rotating roller 41 is embedded so as to rotate in the same X direction as the direction in which the belt-like body enters. The rotating roller 42 is embedded so as to rotate in the Y direction at a portion where the belt-like body 1 travels on the circumferential surface of the turn bar and approaches the direction change start point of the circumferential surface of the turn bar. That is, it is intended to reduce the friction that causes scratches, wrinkles and the like by changing the rotation direction so as to be as close as possible to the running direction of the belt-like body.

  In addition, Patent Document 3 proposes a rotary turn bar that has low friction, low mechanical loss, and no fluctuation in tension when changing the direction of various webs for transporting the belt and the surface of the turn bar. is doing. This is also based on the technical idea that a large number of small rotating rollers are arranged on the outer periphery of the turn bar and the rotation direction is optimized to reduce the friction between the strip and the turn bar.

As described above, in changing the direction of travel of the strip by the turn bar, attempts have been made to make them non-contact or to reduce the friction between them by using rollers.
However, recently, it is necessary to apply high tension to the traveling belt-like body in order to increase the speed of the resin film production apparatus and the rotary printing press. Even at such a high tension, there is an increasing demand for a turn bar that does not cause scratches or wrinkles in the belt and can be easily maintained.
Japanese Patent Laid-Open No. 8-26551 JP-A-6-99566 Japanese Patent Laid-Open No. 2003-160268

  While it is necessary to apply high tension to the belt as the belt travels at high speed, the belt that is relatively soft and susceptible to frictional resistance, such as a resin film, cannot be applied with high tension and may meander during running. I have a problem that is likely to occur. On the other hand, in a relatively hard metal foil, metal thin plate, etc., the tension can be increased, so that the problem of meandering can be reduced. However, even in a contact method such as a rotary turn bar, the traveling direction of the belt-like body and the rotating direction of the contact roll following it do not completely coincide with each other.

  Accordingly, the present invention provides a turn bar that changes the direction of travel of the belt-like body, so that even if a high tension is applied to a soft or hard belt-like body that runs at high speed, there is no generation of scratches or wrinkles on the surface, and meandering during running. It is an object of the present invention to provide a turn bar and a method for changing the traveling direction of a strip that are less likely to occur and easy to maintain.

  As a result of various studies to solve the above-described problems, the present invention has a contact between the strip and the turn bar in order to reduce the frictional resistance even when a high tension is applied in the change of the traveling direction of the strip. The inventors have found that it is only necessary to make point contact with a large number of freely rotatable balls, and the present invention has been achieved. That is, the above-mentioned problem is solved by adopting a turn bar having a structure in which a plurality of freely rotatable balls are arranged on the outer peripheral surface portion and have a function of making point contact with the belt-like body.

The invention described in claim 1
A turn bar used to change the direction of travel of the strip,
A turn bar main body and a ball loosely fitted in a plurality of holes provided on the outer peripheral surface of the turn bar main body;
The opening periphery of the hole is narrowed so that the ball does not fall out of the hole,
A part of the ball is exposed outward from the opening of the hole;
The turn bar is characterized in that the ball is rotatably held.

The invention described in claim 2
A turn bar used to change the direction of travel of the strip,
A cylindrical turn bar body, and a ball having an outer diameter larger than the thickness of the body wall loosely fitted in a plurality of holes provided so as to penetrate the body wall of the turn bar body,
The inner and outer opening periphery of the hole is narrowed so that the ball does not fall out of the hole,
A part of the ball is exposed outward from the opening of the hole;
The turn bar is characterized in that the ball is rotatably held.

The invention described in claim 3 is the turn bar according to claim 2,
The turn bar is characterized in that a core body is inserted on the inner surface of a cylindrical turn bar main body so that the axes coincide with each other.
According to a fourth aspect of the present invention, in the turn bar according to the third aspect,
It is a turn bar characterized in that a cylindrical turn bar main body and the inserted core body are integrated by a fixing means.
The invention according to claim 5 is the turn bar according to claim 3,
A cylindrical turn bar main body is rotatable with respect to the inserted core body.
Invention of Claim 6 is the turn bar in any one of Claims 2-5,
A turn bar comprising a plurality of cylindrical turn bar bodies connected in the axial direction of the cylindrical turn bar body.

The invention described in claim 7
A method for changing the direction of travel of a belt-like body, characterized in that the belt-like body is wound around a ball that is loosely fitted in a plurality of holes provided on the outer peripheral surface portion of the turn bar and held rotatably. .

  In the present invention, since the ball is loosely fitted and held on the outer peripheral surface portion of the turn bar main body, the belt and the ball can be brought into point contact. In the method of changing the traveling direction while supporting the belt-like body by point contact, the rotation direction of the ball can be completely matched to the change in the traveling direction of the belt-like body traveling at high speed. Since the traveling direction on the outer peripheral surface of the turn bar of the belt and the rotation direction of the ball coincide with each other, no flaws and wrinkles due to the difference in direction are generated. Thus, since the frictional resistance between the belt-like body and the turn bar can be essentially reduced, high tension can be applied in high-speed traveling. Therefore, it is possible to reduce the occurrence of the meandering phenomenon in which the belt-like body deviates from the normal path.

Hereinafter, embodiments according to the present invention will be described in detail with reference to FIGS.
FIG. 1 is a perspective view of a belt 1 wound around a turn bar 2 according to an embodiment of the present invention. As shown in the figure, the turn bar main body 7 includes an outer peripheral surface portion 7a and support shaft portions 7b at both ends. A large number of rotatable balls 3 are distributed and arranged on the outer peripheral surface portion 7a. In FIG. 1, the turn bar 2 is wound in contact with the traveling direction (arrow S) of the strip 1 at 45 ° (angle), and the traveling direction of the strip 1 is changed by 90 °. At the same time, the front and back of the band 1 are also reversed. As shown in the figure, not only the 90 ° change but also the angle of the turn bar 2 that abuts against the traveling direction of the strip 1 can be selected. In addition, the angle between the surface of the entering band and the surface of the converted band can be selected variously.

  As shown in FIG. 1, a rotatable ball 3 is exposed outwardly from an opening surface of a hole 4 distributed over the entire outer peripheral surface portion 7 a of the turn bar main body 7. The body 1 is in point contact. Therefore, each ball 3 that is in point contact with the strip 1 at the start of the rotation rotates in the same direction as the arrow S, and each ball 3 that is in contact with the strip 1 just before the end of conversion is in the direction of the arrow P. Rotate. Since the ball is rotatable in all directions, even if the traveling direction of the strip 1 continuously changes from the arrow S to the P direction, the rotation of the ball follows all the changing directions completely. I can do it.

FIG. 2 is a partial cross-sectional view of the turn bar. A rotatable ball 3 is loosely provided on the outer peripheral surface portion 7 a of the turn bar body 7. At both ends of the turn bar main body 7, the turn bar is installed in the belt-like body traveling device, and therefore the outer diameter is reduced to form the support shaft portion 7b. The shape and size of the support shaft portion 7b are appropriately selected according to the type and scale of the belt-like body travel device on which the turn bar is installed. Install the turn bar so that the turn bar main body 7 itself does not rotate with respect to the belt-like body traveling device, or fix both ends of the turn bar 7b so as to rotate by providing bearings (not shown) at both ends of the support shaft portion 7b. May be.
FIG. 3 is a partial cross-sectional view of the turn bar as in FIG. 2, but has a structure in which the outer peripheral surface portion 7 a of the turn bar main body 7 can be separated from the turn bar main body 7. The bottom of the ball 3 is supported by the surface of the turn bar main body 7 at the boundary between the outer peripheral surface portion 7 a and the inside of the turn bar main body 7. Since the outer peripheral surface portion 7a is configured as a separate member, various materials can be selected in consideration of wear resistance, cost, and the like. Similarly, the support shaft portion 7b provided in the turn bar main body 7 can be assembled as a separate material as required.

  Next, the rotatable ball 3 held on the outer peripheral surface portion 7a of the turn bar will be described in more detail. FIG. 4 is an enlarged plan view and a sectional view of a rotatable ball loosely fitted on the outer peripheral surface portion 7a of the turn bar body 7 according to the present invention. As shown in FIG. 4A, the ball 3 is loosely fitted in the hole 4, and a part of the ball is exposed outward from the surface of the opening peripheral edge 5. FIG. 4B is a cross-sectional view taken along the line AA in FIG. The outer diameter of the ball 3 is smaller than the inner diameter of the hole 4, and the ball 3 can freely rotate within the hole 4. The inner diameter of the opening periphery 5 is smaller than the outer diameter of the ball 3 and is narrowed so that the ball 3 does not fall out of the hole 4. In this way, by narrowing the peripheral edge 5 of the opening 4 of the hole 4 larger than the outer diameter of the ball 3, the ball can be loosely fitted and held and rotated. Furthermore, since the outer diameter of the ball 3 is larger than the depth of the hole 4, a part is exposed outward from the opening surface of the hole. The apex 3a of the exposed portion of the ball 3 and the strip 1 are in point contact.

  FIG. 5 is a perspective view showing an example of ball arrangement on the outer peripheral surface portion 7a in the turn bar 2 according to the present invention. In FIG. 1, the balls 3 are arranged over the entire peripheral surface of the turn bar main body 7, but the balls 3 may be arranged only in a portion where the belt-like body 1 contacts the outer peripheral surface portion 7 a. FIG. 6 shows an example in which the cross-sectional shape of the turn bar body 7 is semicircular. Furthermore, when the outer diameter of the central portion in the axial direction of the turn bar is a drum drum shape, the tension in the central portion is relatively high, and the occurrence of meandering of the belt-like body can be reduced. As shown in FIG. 5 and FIG. 6, when the ball is arranged only in the portion where the belt-like body abuts, the turn bar main body itself is bearing-installed so as not to rotate.

  As an embodiment of the turn bar according to the present invention, the shape of the turn bar main body 7 may be a cylindrical body. That is, the outer peripheral surface portion of the turn bar has a cylindrical structure and the inside is hollow. FIG. 7 is a perspective view and a partial cross-sectional view in which a large number of balls are rotatably arranged on a body wall 10a of a cylindrical turn bar main body 10 (hereinafter also referred to as a cylindrical turn bar main body 10). As shown in FIG. 7A, holes 4 penetrating the entire surface are formed at predetermined intervals in the body wall 10a of the cylindrical turn bar body 10, and the balls 3 are loosely fitted and held in the holes. . At both ends of the cylindrical turn bar main body 10, a bearing is attached to a portion where the strip does not come into contact, and is installed in the strip travel device so as to be fixed or rotatable. FIGS. 7B and 7C show an example of a manufacturing method of a structure in which the ball 3 is loosely fitted and held in a through-hole in the body wall of the cylindrical turn bar main body 10. As shown in FIG. 2B, first, a through hole smaller than the outer diameter of the ball is formed in the body wall 10a to form a narrowed opening periphery 5a.

  Next, a concentric hole 4 slightly larger than the outer diameter of the ball is left as a predetermined thickness as the opening periphery 5a. Next, the ball 3 is stored in the hole 4. Further, as shown in FIG. 3C, the periphery of the opening of the hole 4 formed is crushed in a circle to form a groove 6, and the adjacent material at the peripheral edge of the hole is protruded in the inner diameter direction. A narrowed opening periphery 5 is formed. In this way, since the inner diameter of the peripheral edge 5 of the opening is made smaller than the outer diameter of the ball, the ball 3 does not fall out from the hole 4 either inside or outside the body wall. Since the outer diameter of the ball stored in the hole is set larger than the thickness of the body wall 10a, a part of the ball is exposed beyond the inner and outer opening surfaces of the hole.

  The outer diameter of the ball and the inner diameter and thickness of the opening peripheral edge 5a are appropriately set so that the ball 3 does not sink completely in the hole even if it receives a point contact stress from the belt-like body. In the cylindrical turn bar main body 10, since the inside is hollow, the bottom of the ball subjected to stress due to point contact from the belt-like body (the opposite side in the diameter direction of the contact point) is the opening peripheral edge 5 a inside the trunk wall. It is supported by and rotates. In the cylindrical turn bar main body 10, since the inside of the cylindrical body is hollow, the turn bar itself is lightweight. Although an example of the manufacturing method of the structure which narrows the opening peripheral part of the hole for hold | maintaining a ball | bowl rotatably is demonstrated, it is not limited to this method and structure.

  In the above, the turn bar including the cylindrical turn bar main body 10 and the ball disposed on the body wall has been described. Next, a plurality of the cylindrical turn bar main bodies 10 are connected in the main body axial direction, and the connected turn bars are connected. A turn bar in which the core body 20 is inserted with the axes aligned in the main body will be described. In the turn bar of this embodiment, the cylindrical turn bar main body structure portion becomes the outer peripheral surface portion, and the core body 20 is inserted. FIG. 8 is an explanatory view of a turn bar in which a cylindrical turn bar main body 10 holding a ball according to the present invention is connected, and a core body 20 is inserted in the main body so that the axes coincide with each other. FIG. 8A is a perspective view of a cylindrical turn bar main body 10 as a component part of the turn bar. Male and female engagement rings 10b for connection are formed at both end openings of the cylindrical turn bar main body 10. (In FIG. 8, only the male engagement ring 10b on one side is used as the end unit.) The connection can be strengthened by applying a thread to the engagement ring 10b. On the other hand, when it is not necessary to connect firmly, the engagement ring 10b may not be provided.

  FIG. 8B is an assembly explanatory diagram of a turn bar configured by connecting a plurality of cylindrical turn bar main bodies 10. A core body 20 is inserted into a connecting body formed by a plurality of cylindrical turn bar bodies 10 with the axes aligned. In order to prevent the core body 20 from coming off, nuts 21 are screwed onto the screw threads 20b of the core body neck portions 20a (only one end is shown) at both ends as fixing means. When the nuts 21 at both ends holding the cylindrical turn bar main body 10 are tightened, the connected cylindrical turn bar main body 10 and the core body 20 are slid and fixed without free rotation, and both are integrated. . Conversely, when tightening is weakened, the connected cylindrical turn bar main body 10 slides relative to the core body 20 and freely rotates.

  The inner diameter of the core body 20 may be made slightly smaller than the inner diameter of the connected cylindrical turn bar main body 10 so that the gap t is generated. The rotatable ball 3 is exposed from the inner peripheral surface of the body wall by the width of the gap t thus generated, and makes point contact with the outer peripheral surface 20c of the core body 20. That is, the ball rotates while making point contact between the belt-like body and the outer peripheral surface 20 c of the core body 20. Further, by providing the gap t, the cylindrical turn bar main body 10 can be easily inserted into and removed from the core body 20. A cylindrical turn bar main body 10 integrated with the core body 20 can be rotated by attaching bearings to the core body neck portions 20 a at both ends of the core body 20. When the turn bar itself is rotated in the use of the turn bar according to the present invention, since the belt-like body makes point contact evenly with all the balls, there is an advantage that the pressure contact to each ball is uniform and wear of each ball occurs uniformly. .

Furthermore, since a plurality of cylindrical turn bar main bodies 10 are connected to form a turn bar, even if the cylindrical turn bar main body 10 is partially damaged or deformed during operation, the cylindrical turn bar of the part is not affected. Since only the main body 10 can be replaced, maintenance of the turn bar is easy.
As the ball 3 in the turn bar 2 according to the present invention, a steel ball or the like generally used as a ball bearing can be suitably used. When rust prevention or wear resistance is required, plating of chromium metal or various alloys having wear resistance or high corrosion resistance is performed. The material of the ball holder, the cylindrical body, and the core may be any material that can withstand the rigidity and tension of the belt-like body. As a raw material, synthetic resins such as steel, alloy steel, aluminum alloy, and acetal resin can be used.

  In the turn bar 2 according to the present invention, the belt 1 and the rotatable ball provided on the outer peripheral surface portion 7a can make point contact. Further, in the method of changing the traveling direction by supporting the strip by point contact, the ball in contact with the continuous change in the traveling direction of the strip can completely follow and the friction can be reduced. Since the traveling direction of the belt and the rotation direction of the ball coincide with each other, scratches and wrinkles due to the difference in direction do not occur. Thus, the frictional resistance between the belt and the turn bar can be essentially reduced, and the belt can be run with high tension, so that the meandering can be reduced. Therefore, the utility value is high in improving quality and operating efficiency in the printing, papermaking, fiber, resin processing, and steel industries that handle strips.

It is a perspective view which has wound the strip | belt-shaped body around the turn bar which concerns on embodiment of this invention. It is a fragmentary sectional view of the turn bar concerning the embodiment of the present invention. It is a fragmentary sectional view made into the structure which can isolate | separate the outer peripheral surface part of the turn bar which concerns on embodiment of this invention. It is the enlarged plan view and sectional drawing of the ball | bowl hold | maintained rotatably of the turn bar which concerns on embodiment of this invention. It is the perspective view which has arrange | positioned the ball | bowl on a part of outer peripheral surface part of the turn bar which concerns on embodiment of this invention. It is the perspective view which made the main body cross section of the turn bar which concerns on embodiment of this invention semicircular. It is the perspective view and enlarged partial sectional view of the cylindrical turn bar which concern on embodiment of this invention. It is composition explanatory drawing of the cylindrical turn bar which inserted the core which concerns on embodiment of this invention. It is a perspective view explaining the example of the conventional turn bar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Strip | belt-shaped body 2 Turn bar 3 Ball | bowl 3a The vertex of the exposed part of a ball 4 Hole 5, 5a Periphery of an opening part 6 Groove 7 Turn bar main body 7a Outer peripheral surface part 7b Axle part 10 Cylindrical turn bar main body (it also describes cylindrical body unit)
DESCRIPTION OF SYMBOLS 10a Body wall 10b Engagement ring 20 Core body 20a Core body neck part 20b Thread 20c Outer peripheral surface of core body 21 Nut 30 Conventional non-contact turn bar 31 Air ejection hole 40 Conventional rotary turn bar 41, 42 Rotating roller t Gap

Claims (7)

A turn bar used to change the direction of travel of the strip,
A turn bar main body, and a ball loosely fitted in a plurality of holes provided on the outer peripheral surface of the turn bar main body,
The opening periphery of the hole is narrowed so that the ball does not fall out of the hole,
A part of the ball is exposed outward from the opening of the hole;
A turn bar characterized in that the ball is rotatably held. A turn bar used to change the direction of travel of the strip,
A cylindrical turn bar body, and a ball having an outer diameter larger than the thickness of the body wall loosely fitted in a plurality of holes provided so as to penetrate the body wall of the turn bar body,
The inner and outer opening periphery of the hole is narrowed so that the ball does not fall out of the hole,
A part of the ball is exposed outward from the opening of the hole;
A turn bar characterized in that the ball is rotatably held.   3. The turn bar according to claim 2, wherein a core body is inserted on the inner surface of the cylindrical turn bar main body so that the axes coincide with each other.   The turn bar according to claim 3, wherein the cylindrical turn bar main body and the inserted core body are integrated by a fixing means.   The turn bar according to claim 3, wherein the cylindrical turn bar main body is rotatable with respect to the inserted core body.   6. The turn bar according to claim 2, wherein a plurality of the cylindrical turn bar main bodies are connected in the axial direction of the cylindrical turn bar main body.   A method for changing the direction of travel of a band-shaped body, characterized in that the band-shaped body is wound around a ball which is loosely fitted in a plurality of holes provided on the outer peripheral surface portion of the turn bar and held rotatably.

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