JP2009046275A - Travel driving mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a travel driving mechanism enabling accurate travel driving without generating electromagnetic noise and the like. <P>SOLUTION: The travel driving mechanism comprises a plurality of bond magnets 5 provided at intervals on the outer periphery of a rotating driving wheel, and sheet magnets 3 provided on a belt 1 and attracted by the bond magnets 5 to be moved in the same direction. An opposed surface of each magnet 3, 5 is divided into a plurality of areas by a straight line passing through a center, and different magnet poles are formed in each adjacent areas. The area is divided into the front and rear in the traveling direction and into the right and left in a direction orthogonal to the traveling direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a movement drive mechanism, and more particularly to a movement drive mechanism that moves a belt or the like using magnetic force.

2. Description of the Related Art Conventionally, as a moving drive mechanism such as a transport belt, a mechanism that moves a belt with a drive pulley that is rotated by a drive motor is often used. However, since such a moving drive mechanism is driven by the frictional force between the belt and the outer periphery of the pulley, if oil or water adheres to the outer periphery of the pulley, the frictional force decreases and the belt moving speed becomes unstable. There is a problem that the moving accuracy of the belt is lowered. Therefore, in Patent Document 1, magnetic powder is mixed into the belt, and N poles and S poles are alternately magnetized in the longitudinal direction, and a plurality of electromagnets are arranged in the longitudinal direction so as to face the belt surface. In the figure, the electromagnet is appropriately energized to attract and move the belt.
JP 2001-187624 A

  However, the conventional moving drive mechanism using the electromagnet requires a relatively complicated energization control circuit for the electromagnet, and electromagnetic noise generated from the electromagnet has an adverse effect depending on the application.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve such a problem, and an object of the present invention is to provide a movement drive mechanism that enables accurate movement drive without generation of electromagnetic noise or the like.

  In order to achieve the above object, according to the first aspect of the present invention, the driving-side magnet body (5) that moves and the driven-side magnet body (3) that is attracted to the driving-side magnet body (5) and moved in the same direction. The opposing surfaces of the magnet bodies (3, 5) are partitioned into a plurality of regions (31-34), and different magnetic poles are formed in the adjacent regions (31-34).

  In the first aspect of the invention, the same magnetic pole region repels and the different magnetic pole regions are attracted among the regions formed on the opposing surfaces of the driving side magnet body and the driven side magnet body. Therefore, the driven-side magnet body is always attracted in a predetermined posture without causing a shift with respect to the driving-side magnet body, and can be moved with high accuracy. Moreover, since no electromagnet is used, there is no possibility of generation of electromagnetic noise or the like.

  In the second aspect of the invention, the regions (31 to 34) are divided at least in the front-rear direction of the moving direction or the left-right direction in the direction orthogonal to the moving direction. In the second aspect of the present invention, at least the occurrence of displacement in the movement direction or the occurrence of displacement in the direction orthogonal to the movement direction when the driven magnet body moves is prevented.

  In the third invention, the regions (31 to 34) are partitioned into two or more even regions having the same area by straight lines (L1, L2, L3, L4) passing through the center (O) of the facing surface. According to the third aspect of the present invention, the area can be easily divided.

  In this 4th invention, the said drive side magnet body (5) is provided with two or more in the surrounding surface of the rotary body (4), and the said driven side magnet body (3) is the rotary body (4). A plurality of rotating bodies (1) in contact with the peripheral surface are provided at intervals on the peripheral surface. The rotated body can be a conveyor belt. In the fourth aspect of the invention, accurate rotational movement with no positional deviation is realized.

  In addition, the code | symbol in the said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.

  As described above, according to the movement drive mechanism of the present invention, it is possible to realize accurate movement drive without generation of electromagnetic noise or the like.

  FIG. 1 shows an example in which the moving drive mechanism of the present invention is applied to belt driving. In FIG. 1, a belt 1 is disposed as a body to be rotated and is suspended between a pair of pulleys 21 and 22. The belt 1 is made of a resin having a thickness of about 0.5 mm, for example, and conveys electronic components, food, medicine, and the like that require cleanliness and movement accuracy. Sheet magnets 3 as driven side magnet bodies are bonded to the back surface of the belt 1 at regular intervals. The sheet magnet 3 has a thickness of about 0.4 mm, and a binder and a magnetic material are mixed and kneaded to form a sheet. FIG. 1 is drawn differently from the actual size for easy understanding.

  Here, as the binder used for the sheet magnet 3, rubbers such as NBR and SBR, urethane type or polyester type having sufficient resistance against bending at the time of belt reversal at the pulleys 21 and 22 are used. Elastomers can be used. As the magnetic material, ferrite, NeFeB, SmFeN, or SmCo magnetic powders can be used. In the case of rubber, calendering is performed after pressure kneading in the case of rubber, and calendering is performed after extrusion molding in the case of elastomer. Such a sheet magnet 3 is desirably covered with a resin material having flexibility, wear resistance, and water resistance. As the resin material, silicon resin, urethane resin, fluorine resin, or the like can be used.

  As shown in FIG. 2, the sheet magnet 3 bonded to the back surface of the belt 1 has a rectangular shape, and is arranged at equal intervals in the longitudinal direction in the center of the belt 1. The surface of the sheet magnet 3 bonded to the back surface of the belt 1 is divided into four equal areas 31, 32, 33, and 34 by straight lines L1 and L2 passing through the center O (FIG. 3) and orthogonal to each other. The regions 31 to 34 to be operated are magnetized to different poles N and S from each other. Thereby, the surface of the sheet magnet 3 is divided into poles different from each other on the front and rear in the moving direction (arrows in the drawing) and on the left and right in the direction orthogonal to the moving direction.

  In FIG. 1, a driving wheel 4 as a rotating body is provided in contact with the upper surface of one end of the belt 1, and this driving wheel 4 is rotated in the direction of the arrow in the drawing by a motor (not shown). On the outer periphery of the drive wheel 4, a bond magnet 5 having a constant thickness as a drive-side magnet body is provided in the circumferential direction at the same interval as that of the sheet magnet 3. The bond magnet 5 is a mixture of a binder and a magnetic material and formed into a fixed shape by compression molding or injection molding. As the binder, the PA 12 has sufficient rigidity to reliably attract and move the sheet magnet 3 on the belt 1 side. , PA6, PPS, or other thermoplastic resins, or epoxy resins, phenol resins, or other thermosetting resins. As the magnetic material, ferrite, NeFeB, SmFeN, or SmCo magnetic powders can be used. The attachment of the bonded magnet 5 to the drive wheel 4 includes, for example, injection molding a resin magnet holder 51 on the outer periphery of the bond magnet 5 and integrating them, and mechanically attaching the magnet holder 51 to the outer periphery of the drive wheel 4. Means can be employed.

  The bond magnet 5 provided on the outer periphery of the drive wheel 4 has a surface that contacts the belt surface and faces the sheet magnet 3 in the same shape, and the facing surface is divided into four regions like the sheet magnet 3. Thus, each region is magnetized with a pole different from that of the sheet magnet 3. When the bond magnet 5 that moves with the rotation of the drive wheel 4 (arrow in FIG. 4) attracts the sheet magnet 3 via the belt 1, a propulsive force is applied to the belt 1 portion integral with the sheet magnet 3, and the entire belt 1. Are moved in the same direction. At this time, the opposing sheet magnet 3 and the bond magnet 5 have the same polar area repelled from each other and the different polar areas are attracted to each other, so that the magnets 3 and 5 have the same center O (FIG. 3) of the opposing surfaces. To adsorb to each other. As a result, the belt 1 is moved in a state in which the belt 1 is accurately positioned without being shaken with respect to the drive wheel 4 in the longitudinal direction and the width direction. As a result, idle feeding and meandering due to slip of the belt 1 are prevented.

  The outer shape of the sheet magnet 3 and the bond magnet 5 is not limited to a rectangle, but may be a circle as shown in FIG. In addition, as shown in FIG. 6, the magnet surface is divided into four regions 35, 36, 37, and 38 by rectangular diagonal lines L3 and L4, and thereby, the front and rear in the longitudinal direction of the belt 1 and the left and right in the belt 1 width direction. The areas 35, 37 and 36, 38 may be partitioned. Furthermore, if it is only necessary to prevent the belt 1 from being idled by slipping, the magnet surface may be partitioned into two regions before and after the belt longitudinal direction by a straight line extending in the width direction of the belt 1. If it is only necessary to prevent the meandering of the belt, the magnet surface may be divided into two regions on the left and right in the belt width direction by a straight line extending in the belt longitudinal direction. Further, the magnet surface may be divided into six or more even regions by a plurality of straight lines passing through one point of the magnet surface. Here, the one point is preferably the center of the magnet surface.

It is a side view which shows the example which applied the movement drive mechanism of this invention to the belt drive. It is a partial enlarged plan view of the belt back surface. It is a perspective view of a sheet magnet. It is sectional drawing of the drive wheel outer peripheral part which touches a belt. It is a perspective view which shows the other example of a sheet magnet. It is a perspective view which shows the other example of a sheet magnet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Belt (to-be-rotated body), 3 ... Sheet magnet (driven-side magnet body), 31, 32, 33, 34 ... area | region, 4 ... Drive wheel (rotating body), 5 ... Bond magnet (drive-side magnet body).

Claims (4)

A drive-side magnet body that moves, and a driven-side magnet body that is attracted to and moved in the same direction as the drive-side magnet body, the opposing surfaces of the magnet bodies being partitioned into a plurality of regions and adjacent to each other A moving drive mechanism in which different magnetic poles are formed in each region. The movement drive mechanism according to claim 1, wherein the region is divided at least in the front-rear direction of the moving direction or in the direction orthogonal to the moving direction. The movement drive mechanism according to claim 1 or 2, wherein the region is divided into two or more even regions having the same area by a straight line passing through the center of the facing surface. A plurality of the driving side magnet bodies are provided at intervals on the circumferential surface of the rotating body, and a plurality of the driven side magnet bodies are provided at intervals on the circumferential surface of the rotated body that contacts the circumferential surface of the rotating body. The movement drive mechanism according to claim 1, wherein the movement drive mechanism is provided.

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