JPH0640503U - Transmission - Google Patents

Abstract

(57) [Abstract] [Purpose] The timing belt is integrated with the follower without compression deformation. [Structure] The linear portion A1 of the timing belt A is sandwiched between the driven joint 1 and the pressing plate 2 while fitting the tooth portion A2 and the uneven portion 3 of the timing belt A, and the fastening means 5 is attached to the driven joint 1 and the pressing plate 2. By inserting and tightening, the follower 1 until the tip surfaces 4a, 4a of the ridges 4, 4 abut.
Then, the pressing plate 2 approaches and the tightening is completed, and the interval S from the concave surface position 3a of the uneven portion 3 to the other belt contact surface 1a is kept substantially the same as the thickness dimension of the timing belt A. Belt A does not receive a certain force.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transmission device using an annular timing belt formed of an elastically deformable material such as rubber, more specifically, a timing belt is linked to a rotary drive source, and a linear portion of the timing belt is connected to a follower and a pressing plate. The present invention relates to a device which is sandwiched by and is integrated by fastening means inserted through the follower and the pressing plate to convert the rotational movement of the rotary drive unit into the reciprocating movement of the follower.

[0002]

[Prior art]

 Conventionally, as a transmission device of this type, as shown in FIG. 7, for example, a concavo-convex portion 3'fitting with a tooth portion A2 of a timing belt A is formed in a belt shape along a timing belt A on a belt contact surface 2a 'of a pressing plate 2'. The linear portion A 1 of the timing belt A is sandwiched between the follower joint 1 ′ and the holding plate 2 ′ while fitting the projections and depressions 3 ′ and the tooth portion A 2 of the timing belt A, and the follower joint 1 ′. By inserting and tightening a screw as fastening means 5'from the holding plate 2'to the holding plate 2 ', the driven joint 1'and the holding plate 2'approach each other and are sandwiched between the linear portion A1 of the timing belt A, and rotational drive (not shown). There is one in which the driven joint 1'reciprocates in the linear direction via the timing belt A as the source alternately rotates in the forward and reverse directions by a predetermined angle.

[0003]

[Problems to be solved by the device]

 However, in such a conventional transmission device, the tightening force of the fastening means is directly applied to the timing belt and the timing belt is compressed and deformed infinitely.Therefore, there is no tightening limit by the fastening means and the completion of tightening can be confirmed. In general, there is a tendency for over-tightening, and there is a difference between the cross-sectional shape of the timing belt that is distorted due to this compression deformation and the cross-sectional shape of the other part that is not compressed and deformed. When power is transmitted and a tensile force acts on the timing belt, the tensile force concentrates on the boundary portions with different cross-sectional shapes and easily breaks. As a result, the timing belt cannot be used for a long period of time and is economical. There is a problem that the fastening means is easily loosened due to the restoring force of the compressed and deformed timing belt.

In view of such conventional circumstances, an object of the present invention is to integrate a timing belt with a follower without compressing and deforming the timing belt.

[0005]

[Means for Solving the Problems]

 The technical means taken by the present invention to solve the above-mentioned problems is to provide a timing belt on either one of the belt contact surface of the pressing plate and the belt contact surface of the follower that face each other across the linear portion of the timing belt. An uneven part that fits with the tooth part of the belt is formed on both sides in the width direction of the timing belt fitted with the uneven part from the concave position of the uneven part that abuts the convex position of the timing belt tooth part. It is characterized in that ridges are provided between the holding plate and the follower so as to keep the distance to the surface substantially the same as the thickness of the timing belt.

[0006]

[Action]

 According to the above technical means of the present invention, the linear portion of the timing belt is sandwiched between the follower joint and the retainer plate while fitting the toothed portion and the uneven portion of the timing belt, and the fastening means is inserted into the follower joint and the retainer plate. By tightening and tightening, the follower and the pressing plate come close to each other until the tip end surface of the ridge hits, and the tightening is completed, and the distance from the concave surface position of the uneven part to the other belt contact surface is the thickness of the timing belt. The timing belt is maintained at approximately the same size, and no force above a certain level is applied to the timing belt.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, as shown in FIGS. 1 to 3, a follower 1 is formed in a cylindrical shape in which an annular timing belt A is inserted, and a belt contact formed on the inner surface of the follower 1. The surface 1a is opposed to the outer surface A3 of the linear portion A1 of the timing belt A, the pressing plate 2 is arranged so as to face the inner tooth portion A2, and the uneven portion 3 is provided on the belt contact surface 2a of the pressing plate 2. The protrusions 4 and 4 are formed on both sides of the concavo-convex portion 3 so as to project, and a screw is inserted from the follower 1 to the retainer plate 2 as the fastening means 5 and tightened.

The timing belt A is formed in a band shape from an elastically deformable material such as rubber, and is wound in an annular shape from a drive pulley B1 linked with a rotary drive source B such as a motor to a driven pulley C. Turn the driven part 1 and the holding plate 2 with the straight line portion A1 interposed therebetween.

The driven joint 1 engages with a support guide D arranged parallel to a straight line connecting the drive pulley B1 and the driven pulley C, and is reciprocally movable in a linear direction along the support guide D. The entire inner surface facing the linear portion A1 of the belt A is formed into a flat surface parallel to the outer surface A3 of the timing belt A, and the center position in the width direction of the timing belt A orthogonal to the reciprocating direction of the belt is the belt contact surface. Along with the belt contact surface 1a, a plurality of holes 5a through which the screws of the fastening means 5 are inserted are opened around the belt contact surface 1a.

The holding plate 2 is formed in a flat plate shape having a width larger than the width of the timing belt A and substantially the same length as the reciprocating direction of the driven joint 1, and the center position in the width direction is the belt contact surface 2 a. The belt contact surface 2a is provided with a concavo-convex portion 3 that fits with the tooth portion A2 of the timing belt A in a strip shape along the timing belt A, and the concavo-convex portion 3 and the width of the timing belt A fitted with the concavo-convex portion 3 are formed. On both sides in the direction, the distance S from the concave surface position 3a of the concavo-convex portion 3 abutting against the convex surface position of the tooth portion A2 of the timing belt A to the belt contact surface 1a of the follower 1 is set to the thickness dimension of the timing belt A. The protrusions 4 and 4 which are held substantially the same as the above are provided in parallel, and in the illustrated example, the interval between the protrusions 4 and 4 is made substantially the same as the width dimension of the timing belt A.

Further, a plurality of screw holes 5b into which the screws of the fastening means 5 are inserted and screwed are formed around the concave-convex portion 3 at positions facing the holes 5a formed in the driven joint 1. However, in the illustrated example, screw holes 5b ... Are opened in the ridges 4 and 4, respectively.

In this transmission, therefore, the linear portion A1 of the timing belt A is sandwiched between the inner surface of the follower 1 and the holding plate 2 while fitting the tooth portion A2 of the timing belt A and the uneven portion 3. , From the hole 5a opened in the follower 1 to the screw hole 5b opened in the presser plate 2, respectively, by inserting and tightening the screws of the fastening means 5, the presser plate 2 moves toward the inner surface of the follower 1. When the front end surfaces 4a, 4a of the ridges 4, 4 come into contact with the inner surface of the follower joint 1, specifically, the peripheral surfaces 1b, 1b of the belt contact surface 1a, respectively, the pressing plate 2 approaches. Stops and the tightening is completed.

In this state, the distance S from the position of the bottom surface 3a of the uneven portion 3 to the belt contact surface 1a of the follower 1 becomes substantially the same as the thickness dimension of the timing belt A, and the timing belt A has a certain value or more. It is integrated with the follower joint 1 without applying a force and without compressive deformation.

Then, in the illustrated example, one end A4 and the other end A5 of the timing belt A cut into a predetermined size are abutted against each other, and these two are abutted on the belt contact surface 1a of the follower 1 and the belt contact surface of the pressing plate 2. The timing belt A is annularly connected by being sandwiched between the timing belt A and 2a.

On the other hand, FIG. 4 and FIG. 5 show other embodiments of the present invention, respectively. In FIG. 4, the ridges 4, 4 are sandwiched between the inner surface of the follower 1 and the belt contact surface 1a. 4 are provided in parallel, and the tip surfaces 4a, 4a of these ridges 4, 4 are abutted against the peripheral surfaces 2b, 2b of the uneven portion 3, and in FIG. 3 is provided in a concave shape, and projections 4 and 4 are provided in parallel on the inner surface of the follower 1 with the belt abutment surface 1a sandwiched therebetween. It abuts the peripheral surfaces 2b, 2b of the.

Therefore, the same effects as those of the above-described embodiment can be obtained with the devices of FIGS. 4 and 5.

In the embodiment shown above, the belt contact surface 1a of the follower 1 is arranged to face the outer side surface A3 of the straight line portion A1 of the timing belt A, and to face the inner tooth portion A2. Although the pressing plate 2 is arranged and the concavo-convex portion 3 is formed on the belt contact surface 2a of the pressing plate 2, the present invention is not limited to this. For example, as shown in FIG. The timing belt A is arranged so as to face the outer side surface A3 of the straight line portion A1, and parallel ridges 4 and 4 are provided on both sides of the belt contact surface 2a so as to face the inner tooth portion A2. Thus, the belt contact surface 1a of the follower 1 may be arranged, and the uneven portion 3 may be formed on the belt contact surface 1a.

Further, the protrusions 4 and 4 shown in FIG. 6 may be modified as shown in FIGS. 4 and 5, and the shapes of the follower 1 and the support guide D and the fastening means 5 can also be shown. The shape is not limited to this, and another shape may be used as long as it operates in the same manner.

[0020]

[Effect of device]

 Since the present invention has the above-mentioned configuration, it has the following advantages.

1. While fitting the toothed portion and the uneven portion of the timing belt, the linear portion of the timing belt is sandwiched between the driven joint and the holding plate, and the fastening means is inserted into the driven joint and the holding plate to tighten them, and the tip surface of the ridge is tightened. The follower and the presser plate come close to each other until they hit, and the tightening is completed, and the distance from the concave surface position of the uneven part to the other belt contact surface is kept approximately the same as the thickness dimension of the timing belt. Since the belt does not receive more than a certain force, the timing belt can be integrated with the follower without compressive deformation.

Therefore, even if the tension force acts on the timing belt, it does not concentrate and is unlikely to break, as compared with the conventional one in which the fastening force of the fastening means is directly applied to the timing belt and the timing belt is infinitely compressed and deformed. As a result, the timing belt can be used over a long period of time, which is economical, and the fastening means can be prevented from loosening.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a transmission device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view showing the entire device.

FIG. 3 is an enlarged vertical side view taken along line (3)-(3) of FIG.

FIG. 4 is a vertical cross-sectional side view in which only a main part of a transmission device according to another embodiment of the present invention is partially enlarged.

FIG. 5 is a vertical cross-sectional side view in which only a main part of a transmission device according to another embodiment of the present invention is partially enlarged.

FIG. 6 is a vertical sectional side view of a transmission device according to another embodiment of the present invention.

FIG. 7 is a partial partially cutaway perspective view showing an example of a conventional transmission device.

[Explanation of symbols]

 A timing belt A1 straight line portion A2 tooth portion B rotational drive source S spacing 1 driven node 1a belt contact surface 2 holding plate 2a belt contact surface 3 uneven portion 3a concave surface position 4 ridge 5 fastening means

Claims (1)

[Scope of utility model registration request] 1. A timing belt is linked to a rotary drive source, a linear portion of the timing belt is sandwiched between a driven joint and a holding plate, and integrated by fastening means inserted through the driven joint and the holding plate, In a transmission device that converts the rotational movement of a rotary drive unit into a reciprocating movement of a driven joint, one of a belt contact surface of a holding plate and a belt contact surface of a driven joint that face each other with a linear portion of the timing belt interposed therebetween. , Forming a concavo-convex portion to be fitted with the tooth portion of the timing belt, and from the concave surface position of the concavo-convex portion abutting the convex surface position of the timing belt tooth portion to the widthwise both sides of the timing belt fitted with the concavo-convex portion. A transmission device characterized in that projections for holding the distance to the belt contact surface substantially the same as the thickness of the timing belt are provided between the holding plate and the driven joint.