JP2008286355A - Pulley for flat belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform work such as printing to a carrying object on a flat belt even in the vicinity of a pulley, by making the flat belt stably travel, without arranging a crown. <P>SOLUTION: This flat belt driving pulley 30 has a cylindrical outer peripheral surface 31 having a generating line parallel to the rotational axis, and a microscopic projection 32 arranged over the whole periphery of the outer peripheral surface in a central part of the generating line of the outer peripheral surface 31, projecting more than a part except for the central part and setting its projection quantity constant. The microscopic projection 32, that is, the length along the generating line of a large diameter part is set smaller than a width of the flat belt 20 wound around the outer peripheral surface 31. When the traveling flat belt 20 tries to be dislocated to the edge part side of the driving pulley 30, force trying to return the flat belt 20 to the microscopic projection 32 side is generated, and the flat belt 20 is always maintained in the central part vicinity of the driving pulley 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pulley around which an endless flat belt for conveyance or power transmission is wound.

  Conventionally, in an apparatus configured by wrapping an endless flat belt around a plurality of pulleys, the flat belt has a running performance by increasing the diameter of the outer surface of the pulley toward the center, that is, by providing a crown on the pulley. It is known to be stable. In other words, when the running flat belt tends to shift toward the edge of the pulley, a force is generated to return the flat belt to the central side having a large diameter, and the flat belt is always maintained near the center of the pulley. The

  The above-mentioned crown is obtained by molding the outer surface of the pulley into an arc shape, and its molding is not easy, and the curved shape of the crown is flattened at the portion where the flat belt is wound around the pulley. Since it appears, there was a problem that work such as printing on the conveyed object placed on the flat belt could not be performed.

  The present invention makes it possible to stabilize the running of the flat belt without providing a crown, and to make it possible to perform operations such as printing on the conveyed object on the flat belt even in the vicinity of the pulley. The purpose is to provide a pulley.

  The pulley for a flat belt according to the present invention is provided over the entire circumference of the outer peripheral surface at a cylindrical outer peripheral surface whose bus is parallel to the rotation center axis and a central portion of the bus on the outer peripheral surface. A large-diameter portion that protrudes and has a constant protrusion amount, and the length along the generatrix of the large-diameter portion is smaller than the width of the flat belt that is wound around the outer peripheral surface.

  The large diameter portion is preferably formed by a large number of protrusions. According to this, it is possible to prevent the occurrence of slip due to environmental factors such as adhesion of water or oil to the surface of the flat belt or the pulley for the flat belt.

  It is preferable that the angle of the protrusion with respect to the outer peripheral surface of the running belt side portion of the flat belt is 90 ° or less. According to this, the pulley for the flat belt can exhibit a sufficiently large driving force and can maintain a stable high load transmission over a long period of time.

  It is preferable that about half of the first protrusions and the remaining half of the second protrusions are opposite to each other in the running direction. This eliminates the need to select a pulley according to the driving direction of the flat belt. Further, in such a configuration, preferably, the first protrusions form a first protrusion row aligned along the bus bar on the outer peripheral surface, and the second protrusions are aligned along the bus bar on the outer peripheral surface. A second protrusion row is formed, and the first protrusion row and the second protrusion row are alternately arranged.

  The tip of the projection is preferably rounded. According to this configuration, wear on the surface of the flat belt can be reduced as much as possible.

  The flat belt pulley is preferably made of a rigid body, and a large number of protrusions are preferably integrally formed on the surface of the pulley body. This not only improves the durability of the pulley but also simplifies molding.

  According to the present invention, the flat belt can stabilize the traveling of the flat belt without providing a crown, and can perform operations such as printing on the conveyed object on the flat belt even in the vicinity of the pulley. Pulley is obtained.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view schematically showing a configuration of a flat belt conveyance device using an embodiment of the present invention. This flat belt conveying device is used for conveying small items such as confectionery, for example.

  The flat belt conveying device is configured by winding an endless flat belt 20 around a pair of knife edge belt support portions 11 and 12, outer guide rollers 13 and 14, inner guide rollers 15 and 16, and a driving pulley 30. Is done. The drive pulley 30 is connected to a drive motor (drive source) (not shown). The belt support portions 11 and 12 are arranged so that the tapered tip end portions 11a and 12a face in opposite directions to each other, and the upper surfaces of the belt support portions 11 and 12 are set at substantially the same height position. Each of the leading end portions 11a and 12a is opposed to and close to a belt support portion of another flat belt conveying device (not shown), and a gap between the flat belts of the adjacent flat belt conveying devices is not to be conveyed. Small enough compared to

  The inner peripheral surface guide rollers 13 and 14 are provided directly below the base portions of the belt support portions 11 and 12 and are disposed at substantially the same height. The outer peripheral surface guide rollers 15 and 16 are provided inside the inner peripheral surface guide rollers 13 and 14 and below the inner peripheral surface guide rollers 13 and 14 by the diameter of the guide rollers 13 and 14. The driving pulley 30 is provided between the outer peripheral surface guide rollers 15 and 16 and below these. The flat belt 20 passes through the front end portions 11 a and 12 a of the belt support portions 11 and 12, the outside of the inner peripheral surface guide rollers 13 and 14, the inner side of the outer peripheral surface guide rollers 15 and 16, and the outer side of the driving pulley 30. By arranging the outer peripheral surface guide rollers 15 and 16, the winding angle of the flat belt 20 around the driving pulley 30 is set to about 180 °.

  The flat belt 20 has a conventionally known configuration and has, for example, a two-layer structure as shown in FIG. The upper layer 21 is made of, for example, polyurethane resin, and is an outer surface of the flat belt 20, that is, a conveying surface. The lower layer 22 is a knitted fabric made of polyester, for example, and engages with the belt support portions 11 and 12, the inner peripheral surface guide rollers 13 and 14, and the driving pulley 30.

  The outer peripheral surface 31 of the driving pulley 30 has a cylindrical shape whose bus is parallel to the central axis of rotation, and the driving pulley 30 has a large number of minute portions over the entire circumference of the cylindrical outer peripheral surface around which the flat belt 20 is wound. A protrusion 32 is formed. FIG. 3 is a cross-sectional view of the driving pulley 30 in which the minute protrusions 32 are exaggerated. As shown in this figure, the microprojections 32 are provided along the generatrix of the outer peripheral surface 31. The microprotrusions 32 are provided in the central portion of the bus bar, and form a large-diameter portion that protrudes from a portion other than the central portion and has a constant protrusion amount d. The length L along the generatrix of the large diameter portion is smaller than the width b of the flat belt 20.

  FIG. 4 is a diagram showing the outer peripheral surface 31 of the driving pulley 30 in a flat shape. FIG. 5 is a side view showing the minute protrusion 32. In these drawings, in order to facilitate understanding of the configuration of the microprojections 32, the individual microprojections 32 are enlarged and the number thereof is greatly reduced. The arrow F indicates the forward rotation direction of the driving pulley 30 and the arrow R indicates the reverse rotation direction.

  The microprojections 32 are classified into approximately half of the first projections 32a and the remaining approximately half of the second projections 32b. The first minute protrusions 32a form a first protrusion row A aligned along the generatrix of the outer peripheral surface 31, and the second minute protrusions 32b form a second protrusion row B aligned along the generatrix. To do. The first protrusion rows A and the second protrusion rows B are alternately arranged along the rotation directions F and R of the driving pulley 30.

  The first protrusion 32a exhibits a driving force for the flat belt when the driving pulley 30 rotates in the forward direction, and the angle θ1 with respect to the outer peripheral surface 31 of the portion in the running direction of the flat belt at the time of the normal driving is 90 °. It is as follows. On the other hand, the second protrusion 32b exhibits a driving force for the flat belt when the driving pulley 30 rotates in the reverse direction, and an angle θ2 with respect to the outer peripheral surface 31 of the traveling direction side portion of the flat belt during the reverse driving. Is 90 ° or less.

  The driving pulley 30 is made of, for example, a rigid body such as metal, and a large number of minute protrusions 32 are formed integrally with the main body of the pulley 30. That is, the driving pulley 30 is an integrally molded product having a microprojection 32 formed on the surface thereof. Each microprotrusion 32 has, for example, a pyramid shape, but the tip may be inclined in the rotation direction of the driving pulley 30, and the base may have any shape.

  As described above, in the present embodiment, the large-diameter portion including the small protrusions 32 protruding from the both side portions located outside the central portion is formed in the central portion of the bus bar on the outer peripheral surface of the driving pulley 30. Therefore, if the running flat belt 20 is displaced toward the edge of the driving pulley 30, the flat belt 20 is returned to the large diameter portion (the minute protrusion 32) as in the case where the crown is provided. The flat belt is always maintained near the center of the driving pulley 30. Since the large-diameter portion is formed by a large number of microprotrusions 32, it is possible to prevent the occurrence of slip due to environmental factors such as adhesion of water or oil to the surface of the flat belt 20 or the driving pulley 32.

  In the present embodiment, the height of the minute protrusion 32, that is, the amount of protrusion on the outer peripheral surface of the pulley is constant, so that the surface of the flat belt 20 wound around the minute protrusion 32 is substantially flat. Therefore, the flat belt 20 in this portion can perform operations such as printing on the conveyed object, for example.

  Many microprotrusions 32 provided over the entire circumference of the outer peripheral surface of the driving pulley 30 are inclined so that the tips thereof face the rotation direction. Therefore, the driving pulley 30 can give a sufficient driving force to the flat belt 20, and the flat belt 20 can exhibit a sufficiently large conveying capacity and can provide a stable high load transmission over a long period of time. It becomes possible to maintain.

  Further, in the present embodiment, the first pulley 32a that is inclined in the forward direction of the driving pulley 30 and the second minute protrusion 32b that is inclined in the reverse direction are provided. Any of these can be used. That is, in the flat belt conveyance device, the driving pulley 30 can exert the driving force as described above even when the conveyance direction is switched. In addition, a common driving pulley 30 can be used for conveying apparatuses having different driving directions of the flat belt, and the manufacturing cost can be reduced.

  In the present embodiment, the driving pulley 30 is made of a rigid body and the minute protrusions 32 are integrally formed. Therefore, the durability of the pulley is improved, and the driving pulley 30 with the minute protrusions is easily formed. The

  FIG. 6 shows a modification of the minute protrusion 32. In this example, the tip of the minute protrusion 32 is rounded. According to this, as shown in FIG. 5, the wear on the surface of the flat belt 20 can be reduced as much as possible as compared with the case where a minute protrusion having a sharp tip is provided.

  In the above embodiment, the first and second protrusions 32a and 32b whose traveling direction side portions are opposite to each other are provided, but only the first protrusion 32a may be provided.

  Further, in the above embodiment, the minute projections 32 are provided over the entire circumference of the driving pulley 30, but the projections 32 may be provided in a portion where the flat belt 20 is in contact, and the projections 32 are provided uniformly over the entire circumference. Not required. For example, two first protrusion rows A may be provided on the opposite side of the outer peripheral surface 31.

  Furthermore, since the above embodiment is an example in which the present invention is applied to a conveying device, the minute protrusion 32 is provided only on the driving pulley 30, but when the flat belt is for power transmission, the minute protrusion 32 is It is provided on both the driving pulley and the driven pulley.

It is a perspective view showing roughly the composition of the flat belt conveyance device using one embodiment of the present invention. It is sectional drawing which fractures | ruptures and shows a flat belt. It is sectional drawing of the driving pulley which exaggerates and shows a microprotrusion. It is a figure which expand | deploys and shows the outer peripheral surface of a driving pulley to planar shape. It is a side view which shows a microprotrusion. It is a side view which shows the modification of a microprotrusion.

Explanation of symbols

20 flat belt 30 driving pulley 31 outer peripheral surface 32 protrusion

Claims (7)

A cylindrical outer peripheral surface whose busbar is parallel to the rotation center axis;
A central portion of the bus bar of the outer peripheral surface is provided over the entire circumference of the outer peripheral surface, and includes a large-diameter portion that protrudes from a portion other than the central portion and has a constant protruding amount.
A pulley for a flat belt, wherein a length of the large-diameter portion along the generatrix is smaller than a width of a flat belt wound around the outer peripheral surface.   The flat belt pulley according to claim 1, wherein the large-diameter portion is formed by a plurality of protrusions.   3. The pulley for a flat belt according to claim 2, wherein an angle of the protrusion with respect to the outer peripheral surface of a portion in the running direction of the flat belt is 90 [deg.] Or less.   4. The pulley for a flat belt according to claim 3, wherein, in the plurality of protrusions, about half of the first protrusions and the other half of the second protrusions are opposite to each other in the running direction side portion. .   The first protrusions form a first protrusion row aligned along the bus line, the second protrusions form a second protrusion row aligned along the bus line, and the first protrusion The flat belt pulley according to claim 4, wherein the protrusion rows and the second protrusion rows are alternately arranged.   The flat belt pulley according to claim 2, wherein a tip of the protrusion is rounded.   2. The pulley for a flat belt according to claim 1, wherein the pulley is made of a rigid body, and the plurality of protrusions are integrally formed with the main body of the pulley.

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