JPH0530593U - Tension adjustment jig for turnback - Google Patents

Abstract

(57) [Summary] [Purpose] When adjusting the tension of the turnbuckle, prevent the chain from twisting with respect to the rotation of the nut, and adjust the tension accurately. The present invention is a jig for adjusting the tension of a turnbuckle arranged in a straight portion of an endless chain stretched between gears, and a recess that allows a space around the turnbuckle and allows a space around the turnbuckle. And a pair of parallel members that are respectively disposed on both sides of the recess that the chain portion extending from both ends of the turnbuckle traverses and that holds the chain in close contact with both side surfaces of the chain. It is characterized by having done.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a jig for adjusting the tension of an endless chain stretched between gears, and particularly when rotating a turnbuckle provided for tension adjustment, the chain part accompanying the rotation is rotated. The tension adjustment jig for the turnbuckle that prevents the twisting of the.

[0002]

[Prior Art]

 Conventionally, as shown in, for example, FIG. 3, in an endless chain 3 stretched between a pair of gears 1 and 2, turnbuckles 4 and 5 are provided in a straight line portion to adjust the tension, and the chain and the gear are opposed to each other. Transmissions are used that reliably transmit motion from one to the other.

In this transmission, the distance between the gears 1 and 2 is fixed, for example, the gear 1 is fixed, the gear 2 is rotatably supported, and the gear 2 surrounds the gear 1 in the direction of arrow A (counterclockwise). Direction 2), the gear 2 rotates in the opposite direction (clockwise direction) to the rotating direction. For this reason, if the swing arm 6 is integrally supported with respect to the gear 2, it becomes possible to change the angle of the swing arm 6 around the gear 2 in the direction of the arrow B, and it is used as a swing arm mechanism in various kinds of transfer devices. There is.

To adjust the turnbuckle, referring to FIG. 4, first, the fixing nut 9 is loosened from the tightening with the tightening nut 10, and then the tightening nut 10 is turned to rotate the chain portions 11 and 11. Adjust the relative distance between the two via the bolts 12,12, and fix this distance by tightening the fixing nuts 9,9. However, due to the movement of the chain and the gear, the load acting on it, and the vibration caused by its variation, the fixing nuts 9 and 9 loosen over time, causing variation in the chain tension.

Conventionally, as a countermeasure against this, an attempt has been made to apply an adhesive material to the fixing nut or to use a nut having a rotation stopper, but it is not complete and complicated.

[0006]

[Problems to be solved by the device]

 In view of such circumstances, the present invention prevents twisting of the chains during adjustment work of the turnbuckle, prevents loosening of the fixing nut, and eliminates the need for frequent readjustment. It is an object of the present invention to provide a simple tension adjustment jig for a turnbuckle that enables reliable operation of the.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is a jig for adjusting the tension of a turnbuckle arranged in a straight part of an endless chain stretched between gears. And a pair of parallel members that are respectively disposed on both sides of the recess that the chain portion extending from both ends of the turnbuckle traverses and that holds the chain in close contact with both side surfaces of the chain. It is characterized by being composed of a plate member.

[0008]

[Action]

 According to the above configuration, when the turnbuckle is positioned so as to straddle the recesses of the jig and the chain portions extending from both ends of the turnbuckle are fitted into the pair of parallel members located on both sides of the recess, both ends of the turnbuckle are closed. Both side surfaces of the chain part are closely held by the inner wall of the parallel part, and twist of the chain part is restricted. Furthermore, if the other side surface of the chain portion is pushed into contact with the plate member, the chain portion is held by the three side surfaces, and more reliable twist prevention is possible. Since the jig is composed of a plate member that has a recess that allows a space around the turnbuckle, a sufficiently wide space can be obtained around the turnbuckle, making it easier to operate a work tool such as a spanner. ..

Therefore, by simply setting the jig on the endless chain, the chain portions can be twisted with each other during a series of operations of rotating the fixing nut, rotating the tightening nut and adjusting the tension. Fixed without.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a tension adjusting jig for a turnbuckle according to the present invention, which comprises a jig body 8 having a recess 7 and a pair of parallel members 20 and 30 arranged therein.

The recess 7 has a space sufficiently larger than the predetermined size of the turnbuckles 4 and 5 and allows one turnbuckle to be straddled there. Parallel members 20 and 30 are arranged on both sides of the recess 7 on the same axis and are fixed integrally to the jig body 8. Each of the parallel members 20 and 30 is a member having a U-shaped cross section having a pair of parallel walls 21, 22; 31 and 32 facing each other, and the parallel wall interval allows both side surfaces of the chain to be closely held to the inner wall surface. It is a size. Therefore, the chain can be tightly housed and held inside the parallel members 20 and 30.

FIG. 2 is a plan view showing a state in which the tension adjusting jig shown in FIG. 1 is set in the vicinity of a turnbuckle of an endless chain and its reference numerals are the same as those in FIG. A method of adjusting the tension of the turnbuckle will be described with reference to FIG.

First, the chain parts 11, 11 are tightly inserted and held in the parallel members 20, 30. At this time, it is desirable to insert the chain portion until it comes into contact with the U-shaped bottom of the parallel member. Next, loosen the fixing nuts 9 and 9 with a spanner and rotate the tightening nut 10 to move the bolts 12 and 12 closer to or away from the tightening nut 10 to adjust the chain tension to a predetermined tension. After that, the loosened fixing nuts 9 and 9 are tightened again.

During this time, since the chain portions at both ends of the turnbuckle are held by the parallel members 20 and 30, they do not rotate, that is, twist. In addition, since the jig body 8 is a plate member and forms a recessed portion that straddles the turnbuckle, the space around the turnbuckle has a sufficient space, which is an obstacle to the work of the tightening tool such as a spanner. I won't.

It should be noted that a fixing means for fixing the jig body to the transfer device may be provided if necessary, and the jig itself is fixed in order to prevent rotation of the jig body when the tightening torque is large. Good.

In addition, the distance between the parallel walls of the parallel members 20 and 30 may be adjusted depending on the size of the chain because the distance between the parallel walls is held so as to sandwich both side surfaces of the chain. The part may be curved along the contour of the chain.

Next, by using the jig of the present invention, the swing arm mechanism of a transfer device that facilitates adjustment of an endless chain, particularly a wafer transfer device used in semiconductor manufacturing technology, will be described.

This apparatus mounts the semiconductor wafer cassette 40 on a pedestal 41 and horizontally moves the pedestal 41. The pedestal 41 is moved from the central position on the line AA indicated by a virtual line to the rightmost end. The moved state is shown in FIG.

6 to 8 further clearly show the structure of each part, and FIG. 6 shows that a pair of swing arm mechanisms are arranged at positions facing each other via a connecting member 52. FIG. 7 is a side view of the carrier device, FIG. 7 is a front view of the main swing arm 42 showing the connecting portions of the chain 53 by exposing the covers near the turn buckles 54, 55, and FIG. It is the side sectional view seen along the -A line.

In FIG. 8, a main shaft 44 is rotatably fitted in a hollow shaft 57 to which a main gear 46 is fixed, and one end of a main swing arm 42 is attached to the main shaft 44. On the other hand, a main gear 56 meshed with the first endless chain 45 is arranged at the other end of the main swing arm 42, and the main gear 56 rotates the sub swing arm 47 via the rotary shaft 58. The endless chain 61 stretched between the sub gear 60 fixed to the other end of the main swing arm 42 and the sub gear 62 fixed via the receiving base 41 and the receiving shaft 49 also has a straight line. Turnbuckles 64 and 65 are provided on the upper part.

The operation of this device is such that when the main swing arm 42 rotates in the direction of arrow C (counterclockwise) around the main shaft 44 at the rightmost position of the pedestal 41 shown in FIG. In order to rotate clockwise the main gear 46 meshed with the first endless chain 45 mounted, the auxiliary swing arm 47 fixed to the main gear 46 rotates around the main gear 46 in the direction of arrow D. Is becoming Therefore, the turning angles of the arms 42 and 47 are accurately controlled, and the receiving shaft 49 that pivotally supports the receiving base 41 moves leftward along the horizontal line 50.

The upper surface of the pedestal 41 is horizontally supported by rotating the receiving shaft 49 counterclockwise by the second endless chain 51 stretched on the auxiliary swing arm 47 in the same manner as the main swing arm 42. To be kept.

In this device, since the endless chain operates to transmit the rotation angle of the gear, a slight slack in the chain affects the rotation angle of the gear and causes a large change in the moving distance. Therefore, it is necessary to adjust the chain accurately, but if the jig of this device is used, the chain near the turnbuckle will be pressed from both sides to prevent the chain from twisting, so the chain will not loosen after the turnbuckle adjustment. Not born

[0024]

[Effect of the device]

 The tension adjusting jig of the present invention can fix the chain portion by simply straddling the turnbuckle in the recess and inserting the chain portions extending from both ends of the turnbuckle into the parallel members, and the nut for adjusting the tension of the turnbuckle. Since the chain is not twisted by the rotation of, the tension can be adjusted accurately. Therefore, it is particularly effective when the swing arm mechanism is used to transmit the rotation angle of the gear with extremely high accuracy.

Further, when adjusting the tension of the turnbuckle, a sufficiently wide space can be obtained around the turnbuckle, so that a working tool such as a spanner can be easily operated.

[Brief description of drawings]

FIG. 1 is a perspective view of a tension adjusting jig for a turnbuckle showing an embodiment of the present invention.

FIG. 2 is a view showing a state in which the jig of FIG. 1 is attached to a chain portion connected by a turnbuckle.

FIG. 3 is a schematic view of a chain transmission device including a conventional swing arm mechanism.

FIG. 4 is a schematic configuration diagram of a chain connecting portion for explaining a conventional turnbuckle tension adjusting method.

FIG. 5 is a front view showing a semiconductor wafer transfer device including a swing arm mechanism.

6 is a side view of the wafer transfer device of FIG.

FIG. 7 is a partially cutaway front view of a main swing arm with a turnbuckle portion of a wafer transfer device exposed.

8 is a side sectional view of the main swing arm of FIG. 7 as seen along the line AA of FIG.

[Explanation of symbols]

 3 Endless chain 4, 5 Turnbuckle 6 Swing arm 7 Recessed part 8 Jig body 9 Fixing nut 10 Tightening nut 11 Chain part 12 Bolt part 20,30 Parallel member 21,22,31,32 Parallel wall

Claims (1)

[Scope of utility model registration request] 1. A jig for adjusting the tension of a turnbuckle arranged in a straight portion of an endless chain stretched between gears, the recess extending across the turnbuckle and allowing a space around the turnbuckle. , A pair of parallel members that are respectively disposed on both sides of the recess that the chain portion extending from both ends of the turnbuckle traverses and that holds the chain in close contact with both side surfaces of the chain. Tension adjustment jig for turnbuckle.