JP2573051Y2 - Coil spring compression device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for compressing a coil spring when assembling the coil spring on a work.

[0002]

2. Description of the Related Art In a vehicle suspension, a coil spring is mounted on an oil damper in a compressed state. As a jig for compressing the coil spring, as shown in FIG. 6, a horseshoe-shaped pushing plate is fixed to the end of an operating rod 51 which moves up and down by a cylinder 50, and coil springs are attached to a plurality of positions of the pushing plate 51. Are provided with the locking claws 53 of FIG.

[0003]

In the conventional coil spring compression jig, a plurality of locking claws 53 provided on the pressing plate 51 are provided so as to correspond to the target coil spring. Therefore, when the free length, the wire diameter, and the spring pitch of the coil spring are changed, the locking pawl needs to be tuned to cope with the change. The tuning of the locking claw requires a great deal of man-hours, and the suspension of an automobile may be changed several times before the start of a new vehicle, and responding to this requires a great deal of work.

An object of the present invention is to provide a coil spring compression apparatus which solves the above-mentioned conventional problems.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a work clamp device for fixing a work to which a coil spring is to be assembled in a fixed position, and a work clamp device installed close to the work clamp device. A coil spring compression cylinder, an operating rod that rotatably supports a pinion at the tip and rotatably moves up and down by the coil spring compression cylinder, and an axis parallel to the operating rod, with the operating rod positioned at the center and left and right. The two guide rods arranged, a pair of movable tables guided slidably in the axial direction by the two guide rods, and meshed via the pinion and a rack, and the pair of movable tables A pair of arms provided so that they can be opened and closed by an opening / closing cylinder around the axis of the guide rod, and the pair of arms can be floated. A pair of arms having locking pawls for the coil springs, which can be disengaged from the pushing plate contacting the upper end surface of the coil springs and the teeth of the pinion, and the pair of arms descend to the coil spring compression start position. And a pinion rotation preventing means for restraining the rotation of the pinion until the pinion closes.

[0006]

According to the present invention having the above structure, a coil spring is set on a work clamped in a fixed position, and a start button is set to O.
N, and the operating rod is lowered by the coil spring compression cylinder. At this time, since the rotation of the pinion is restricted by the pinion rotation preventing means, the pair of left and right operating tables simultaneously move down via the rack meshing with the pinion. The arm is closed when the operating table moves down to the compression start position of the coil spring, and the pinion rotation prevention means releases the pinion from being restrained from rotating so that the pinion is freely rotated. In this state, the operating table continues the downward movement, one of the right and left push plates abuts against the upper end surface of the coil spring, and the locking claw is engaged with the coil spring to stop the downward movement. Next, the other operating table follows the pinion and the rack and moves down, the pushing plate abuts on the upper end surface of the coil spring, and the locking claw is locked by the coil spring. It is moved downward, and the coil spring is compressed to a predetermined position by the pushing plate.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a base fixed on the floor, 2
Denotes a work holding table provided on the base 1. The position of the work holding table 2 in the vertical direction with respect to the base 1 can be adjusted to an appropriate position according to the size of the work W by the adjustment shaft 3.

Reference numeral 4 denotes a work clamping device, which comprises a work holding cylinder 4a and a holding claw 4b that opens and closes with the work holding cylinder 4a, and clamps and holds the work W placed on the work holding table 2. Unclamp.

A cylinder 5 for compressing a coil spring is installed in the vertical axis direction in proximity to the work holding table 2 and the work clamping device 4. The cylinder 5 for compressing the coil spring is provided with an operating rod 6 extending upward on a coaxial line.
Is moved up and down.

A pinion 7 is provided at the upper end of the operating rod 6.
Are rotatably supported. Numeral 8 is a pinion rotation preventing means for restricting the rotation of the pinion 7 until the operating rod 6 reaches a predetermined lowering position. A pin 8a engaging with the teeth of the pinion 7, and an actuator for moving the pin 8a forward and backward 8b.

The operation rod 6 is located at the center, and two guide rods 9a are arranged on the left and right sides along an axis parallel to the operation rod 6,
9b are arranged. These two guide rods 9a,
9b, movable tables 10a and 10b are slidably guided in the axial direction, and the pinion 7 and racks 11a and 11b
Are meshed through.

Arms 12a and 12b are provided on the pair of movable tables 10a and 10b so as to be able to open and close around the axis of the guide rods 9a and 9b by opening and closing cylinders 13a and 13b. This pair of arms 12a, 12
b has locking claws 16a and 16b of the coil spring S, and push-moving plates 14a and 14b abutting on the upper end surface of the coil spring S are mounted on the shafts 15a and 15b and the spring so as to be able to float. .

Reference numeral 17 denotes a dog fixed to the moving table 10b. The dog 17 operates by contacting a limit switch LS1 for confirming the rising end of the movable base 10b, a limit switch LS2 for confirming the compression start point of the coil spring, and a limit switch LS3 for confirming the descending end.

The operation of the above configuration will be described. The original positions of the moving tables 10a and 10b are the rising end positions as shown in FIG. At the original positions of the movable tables 10a and 10b, the pins 8a of the pinion rotation preventing means 8 are engaged with the teeth of the pinion 7 to restrict the rotation of the pinion 7. The arm 12
As shown in FIG. 2, a and 12b are in the open positions in the left-right direction and are in the turning positions.

The work W on which the coil spring S is set in the original position is placed on the work holding table 2 and clamped by the work clamp device 4. Next, the start button is turned on, the coil spring compression cylinder 5 is operated, and the operation rod 6 is lowered. At this time, since the rotation of the pinion 7 is restricted by the pinion rotation preventing means 8, the pair of left and right operating tables 10a and 10b simultaneously move down via the racks 11a and 11b engaged with the pinion 7.

When the operating tables 10a and 10b move down to the compression start position of the coil spring, the dog 17 activates the limit switch LS2, and the opening / closing cylinders 13a and 13b operate according to this confirmation signal, and FIGS.
As shown by, while the arms 12a and 12b close,
The pinion rotation preventing means 8 releases the rotation constraint of the pinion and makes the pinion freely rotate.

In this state, the operating tables 10a and 10b continue to move downward, for example, as shown in FIG. 5, the left pushing plate 14a contacts the upper end surface of the coil spring S, and the locking claw 16a is The descending movement is stopped by being locked by the spring S. Next, the operating table 10a on the right is the pinion 7 and the rack 1
1b, the pressing plate 14b abuts on the upper end surface of the coil spring S, and the locking claw 16b locks on the coil spring S.
a and 10b are simultaneously moved downward to move the pressing plates 14a and 1b.
4b compresses the coil spring S to a predetermined position. When the coil spring S is compressed to the predetermined position, the dog 17 operates the limit switch LS3 to detect the completion of the compression.

After that, the upper seat is set on the coil spring S, and the nut is tightened.
a, 10b are raised, stopped at an arbitrary raised position, the arms 12a, 12b are opened and returned to their original positions, completing the compression cycle of the coil spring, and waiting for the next cycle.

[0019]

As described above, according to the present invention, a work clamp device for fixing a work to which a coil spring is assembled to a fixed position, a coil spring compression cylinder installed close to the work clamp device, An operating rod that rotatably supports a pinion and moves up and down by the coil spring compression cylinder; and two guide rods that are disposed at the center of the operating rod and that are arranged on the left and right sides along axes parallel to the operating rod. A pair of movable tables guided slidably in the axial direction by the two guide rods and engaged with the pinion via a rack; and a cylinder for opening and closing the pair of movable tables around the axis of the guide rod. A pair of arms provided so as to be able to swing open and close, and a coil spring attached to the pair of arms so as to be floatable. A push plate that abuts on an upper end surface of the coil spring and is detachable from teeth of the pinion, and the pinion is moved until the pair of arms is lowered to the coil spring compression start position and closed. The structure is provided with a pinion rotation preventing means for restricting the rotation of the coil spring, so that the coil spring can be compressed without tuning for various kinds of coil springs having different free lengths, wire diameters, and spring pitches. Improve efficiency. In addition, since the compression difference between the right and left push plates is absorbed by the rack and the pinion, there is an advantage that compression can be performed by applying a uniform pressure to the left and right.

[Brief description of the drawings]

FIG. 1 is an overall front view of the device of the present invention.

FIG. 2 is a plan view showing an open state of an arm and a push plate.

FIG. 3 is a front view showing a state in which an arm and a pushing plate are closed.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a front view of a state in which one pushing plate abuts on an upper end of a coil spring and the other pushing plate follows and moves downward.

FIG. 6 is a perspective view of a conventional coil spring compression jig.

[Explanation of symbols]

 Reference Signs List 1 base 2 work holder 4 work clamp device 5 coil spring compression cylinder 6 operating rod 7 pinion 8 pinion rotation prevention means 9a guide rod 9b guide rod 10a movable table 10b movable table 11a rack 11b rack 12a arm 12b arm 14a Plate 14b Push plate 16a Locking claw 16b Locking claw S Coil spring

Claims (1)

(57) [Scope of request for utility model registration] A work clamp device for fixing a work to which a coil spring is to be assembled in a fixed position; a coil spring compression cylinder installed in close proximity to the work clamp device; An operating rod that is moved up and down by a coil spring compression cylinder; two guide rods that are located at the center of the operating rod and that are arranged on the left and right with axes parallel to the operating rod; and an axis that is connected to the two guide rods A pair of movable tables guided slidably in the direction, and meshed with each other via the pinion and a rack; An arm, attached to the pair of arms so as to be capable of floating,
A push plate having a locking claw of the coil spring, which is in contact with an upper end surface of the coil spring, and which can be disengaged from the teeth of the pinion, until the pair of arms descends to the coil spring compression start position and closes A compression device for a coil spring, comprising: a pinion rotation preventing means for restricting rotation of the pinion.