JPH0321909Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a parallel chuck used in a robot for transporting goods.

(Prior art) Conventionally, two grooved rails are mounted facing each other on one side of a casing, and the bases of two chuck members are slidably fitted into the grooves of the rails, and the chuck members are mounted inside the casing. A parallel chuck is known in which both chuck members are slid toward and away from each other via a cam that rotates as a rod of a cylinder moves forward and backward.

In the conventional parallel chuck, the base of the chuck member 21 is connected to the rail 22, as shown in FIG.
Extends to the cylinder 23 side beyond the fitting part with
A pin 25 perpendicular to the rail is attached to the extension 24, and the end of the cam 26 is fitted onto the pin 25 and locked therein.

In the conventional parallel chuck, when the rod 27 of the cylinder is extended, the two cams 26 rotate about their mounting pins 28 in a direction in which their tips move away from each other, opening the gap between the two chuck members, and conversely When the rod 27 of the cylinder moves back, the cam 2
The tips of the chuck members 6 are rotated in a direction toward each other, and the distance between the two chuck members is narrowed.

In such an operation, a force in the circumferential direction shown by arrow 29 is applied to the pin 25 attached to the chuck member due to the rotation of the cam, and this force is transmitted to the chuck member 21, so that the chuck member is A force in the same direction will also be applied. This force is transmitted to the fitting portion of the chuck member with the rail, and its magnitude increases in accordance with the distance between the fitting portion and the pin 21. Therefore, the fitting portion of the chuck member pushes up or down the upper and lower surfaces of the rail with a relatively large force.

(Problems to be Solved by the Invention) According to the above-described conventional technology, as described above, a large force is applied to the rail surface when the chuck member moves in parallel. As a result, the friction between the chuck member and the rail surface was large, resulting in severe wear of the rail. The cylinder also needed to be relatively large, so it was considered impossible to manufacture a small parallel chuck with a width of about 14 mm.

(Means for solving the problem) In the parallel chuck of this invention, a vertical groove is formed at the base end of the chuck member that is fitted into a groove in a rail attached to one side of the casing, and a pin is inserted into the vertical groove. is attached at right angles to the rail and at a height that coincides with the center line of the rail, and is configured by fitting and locking a locking groove formed at the tip of the cam onto the pin. Further, the pin attached to the chuck member is rotatable, and both ends of the pin are slightly protruded to the outside of the chuck member.

Furthermore, there are no limitations on the specific structure and material of the rail as long as it has a groove for fitting the chuck member.

(Function of the invention) The parallel chuck of this invention rotates a cam by moving the rod of the cylinder back and forth, transmits the rotational force of the cam to the chuck member via a pin attached to the chuck member, and transmits this along the rail. It is similar to a conventional parallel chuck in the point of parallel movement. However, in this invention, since the pin is installed at a height that coincides with the center line of the groove of the rail, the rotational force transmitted from the cam to the pin and the rotational force at the fitting portion of the chuck member are approximately equal.
Therefore, the pushing up and pushing down forces of the fitting portion of the chuck member against the upper and lower surfaces of the rail groove are as small as possible, and the friction at this portion is also small.

Furthermore, since both ends of the pin protrude outside of the chuck member, the chuck member does not come into direct contact with the side wall of the rail, but rather makes point contact with the tip of the pin, so the friction on the rail side wall portion is extremely small. Therefore, the durability of the rail is improved, and a relatively small cylinder can be used to slide on the chuck member, making it possible to obtain a small parallel chuck.

Furthermore, since the pin is rotatable, the contact surface of the pin with the locking groove of the cam changes.
Pin wear is evened out over the entire circumference, improving durability.

(Example) An example of this invention will be described below based on the drawings.

Two grooved rails 3 are installed facing each other on one side of a rectangular cylindrical casing 2 in which a double-acting cylinder 1 is mounted, and two chuck members 5 are attached to the grooves 4 of the rails 3 on both sides of their proximal ends. A locking convex portion 6 protruding from is fitted and locked. A vertical groove 7 is formed in the base end of each chuck member 5, and a pin 8 is inserted into the vertical groove 7 at right angles to the rail 3 and at a height equivalent to the center line of the groove 4 of the rail. , rotatably mounted. Both ends of the pin 8 are slightly protruded to the outside of the locking projection 6.

Two cams 9 are rotatably attached to the casing 2 by shafts 10 perpendicular to the rails 3. The base end of the cam 9 is connected to the end of the rod 11 of the cylinder 1 via a shaft 12,
A long groove 13 formed at the tip loosely fits into a pin 8 attached to the chuck member.

Note that the grooved rail 3 has wide upper and lower plates 3a.
It is configured with a narrow middle plate 3b interposed therebetween,
It is fixed to the casing 2 by screws passing through the three plates. In the figure, 14 is a port for supplying pressurized air to the cylinder 1.

According to this embodiment, the rod 11 of the cylinder
extends as shown by arrow 15 in FIG. 3, cam 9 rotates as shown by arrow 16, and chuck member 5 extends as shown by arrow 17
Move in parallel like this. Conversely, when the cylinder rod 11 moves backward as shown by the arrow 18, the cam 9 rotates as shown by the arrow 19, and the chuck member moves as shown by the arrow 20.
Move in parallel like this. At this time, a force acts on the locking convex portion 6 of the chuck member in the same direction as the rotation of the cam 9, but the magnitude of this force is almost the same as the magnitude of the force applied to the pin 8, and is different from the conventional one. The force is not increased in this way. Therefore, the friction generated between the locking protrusion 6 and the upper and lower surfaces of the groove of the rail 3 during sliding of the chuck member is relatively small. Further, since both ends of the pin 8 are made to protrude outside the locking projection 6, the contact between the locking projection and the vertical surface of the rail 3 is a point contact, and the friction at this portion is reduced as much as possible.
As a result of these factors, in this embodiment, the friction generated when the chuck member slides is much smaller than in the conventional case.

Furthermore, since the pin 8 is rotatable, the contact surface of the pin 8 with the long groove of the cam 9 changes, and wear of the pin is averaged over the entire circumference.
Improves durability.

Further, according to this embodiment, since the rail 3 is made of a combination of three plates, when the rail groove surface becomes worn, it can be disassembled, polished, and used again.

Furthermore, according to this embodiment, since the casing is shaped like a rectangular cylinder, a larger cylinder can be mounted thereon compared to a cylindrical casing of the same width.

(Effects of the invention) According to this invention, the position of the cam fitting pin attached to the chuck member is set at a height that matches the center line of the groove of the rail, so that the rotational force acting on the locking protrusion of the chuck member is reduced. Extremely small compared to conventional ones. Furthermore, since both ends of the pin protrude outward from the chuck member and the tip of the pin comes into contact with the side wall of the rail groove, a point contact is made and the friction at this portion is reduced as much as possible. Therefore, the chuck member can be slid with a relatively small force, and a small cylinder is sufficient. Therefore, it is possible to reduce the width of the entire device, and it is possible to obtain a small parallel chuck with a width of about 14 mm, which was previously impossible to obtain.

Also, since the pin position is lower than the conventional one,
The height of the casing can also be reduced, and the overall chuck can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a front view of the embodiment of this invention, Fig. 2 is a side view, Fig. 3 is a front sectional view, Fig. 4 is a side sectional view, and Fig. 5 is a front sectional view of the conventional example. . 1...Cylinder, 3...Rail, 4...Groove,
5...Chuck member, 6...Locking convex portion, 7...Vertical groove, 8...Pin, 9...Cam, 13...Groove.

Claims (1)

[Claims for Utility Model Registration] 1. Two grooved rails are installed facing each other on one side of the casing, and the bases of two chuck members are slidably fitted into the grooves of the rails, and the two chuck members are fitted into the casing. In the chuck, the chuck members are slid toward and away from each other via a cam that rotates as the rod of the attached cylinder advances and retreats, and a vertical groove is formed in the base end of the chuck member. A pin is mounted at right angles to the rail and at a height that coincides with the center line of the rail. A parallel chuck characterized in that a locking groove formed at the tip is fitted and locked. 2. The rail is constructed by interposing a narrow middle plate between wide upper and lower plates.
Parallel chuck as described in section.