JP3205038U - Rotation indexing mechanism using vertical motion - Google Patents

Abstract

A rotary indexing mechanism that converts vertical motion into rotational motion and rotates in one direction at a constant angle, without using an external power / control device, takes the timing of vertical motion and rotational motion, and is low in cost. Provide space-saving and easy maintenance. When the upper die is lowered, it is transmitted to a cylindrical cam / one-way clutch portion 7 by a push pin 6. At this time, the cylindrical cam / one-way clutch unit 7 does not convert the downward motion into a rotational motion, and the upper punch 2 and the lower die 3 keep a hole in the work piece 1 in a predetermined position. It is done. When the upper mold is raised, the cylindrical cam driver 7-1 is moved upward through the flange 7-6 by the force of the gas spring 7-8. This upward movement is converted into a rotational movement by the cylindrical cam / one-way clutch section 7. This rotational motion is transmitted to the lifter 4 by the lifter gear 5 to rotate the lifter 4 and the workpiece 1 placed thereon. [Selection] Figure 1

Description

This mechanism converts the vertical motion into a rotational motion without the need for an external power / control device, and adds a mechanism that rotates only in one direction to index the workpiece at a predetermined rotational angle. Objective.

Conventionally, automatic rotary indexing of workpieces is often performed by attaching a control device to the external power. In this case, the cost of purchasing the external power and the control device and the space for installing these are required. In addition, there is a problem that advanced control using a lot of sensors is required when cooperation with vertical movement is required.

Since the mechanism is complicated in this way, there is a drawback that maintenance is not easy.

As a method of indexing rotation without using external power in a press die, a method using a cam disclosed in the public utility model "Sho 63-184632" or connecting the upper and lower dies of a press with a chain. There is a method of rotating the gear inside the mold by pulling the chain.

In the case of a cam, there is a restriction that the rotation angle cannot be large for the vertical movement.

In the case of a chain, since there is a chain that connects the upper mold and the lower mold, there is a restriction that it becomes an obstacle to carrying in / out the workpiece.

Published Utility Model Application No. Sho 63-184632

Therefore, this mechanism does not require an external power / control device, provides a large rotation index angle even when the space is small and the vertical movement stroke is small, and does not obstruct the loading / unloading of workpieces, making maintenance easy. It is to provide a rotation indexing mechanism using a simple vertical motion.

The main feature of this mechanism is that it uses a cylindrical cam to convert vertical motion into rotational motion and uses a one-way clutch to rotate only in one direction.

This mechanism does not require external power and a control device for rotational indexing, and the cylindrical cam can easily and accurately take the timing of the vertical motion and the rotational motion. Even if the vertical motion stroke is small, the rotational angle In addition to being able to save space by taking up a large amount of space, it has the advantage of easy maintenance due to its simple structure.

Sectional drawing of the press die which shows embodiment by this mechanism. The schematic diagram which shows operation | movement of a cylindrical cam one-way clutch in embodiment. The cylindrical cam structure of embodiment.

Hereinafter, a description will be given using an embodiment in which the mechanism is embodied.

FIG. 1 is a cross-sectional view of a press die when this mechanism is applied to a press die, and is an embodiment in which a hole is formed in a workpiece 1 on a constant angle and a constant circumference.
The upper die is equipped with a punch 2 that drills a hole in the work piece 1 and a push pin 6 that transmits a downward force to the cylindrical cam / one-way clutch part 7. The lower die is a die 3 and a lifter 4 that lifts the work piece. A lifter gear 5 that receives rotation of the cylindrical cam / one-way clutch portion 7 and a cylindrical cam / one-way clutch portion 7 are installed.

The work piece 1 is placed on a lifter 4 held in a floating state from the die 3 so as not to damage the work piece during rotation.
When the upper die descends, the vertical motion is transmitted to the cylindrical cam / one-way clutch portion 7 by the push pin 6. At this time, the cylindrical cam / one-way clutch unit 7 does not convert the vertical motion into a rotational motion, and a hole is made in the workpiece 1 with the upper punch 2 and the lower die 3 in a predetermined position. It is done.
Thereafter, when the upper die starts to rise, the cylindrical cam driver 7-1 moves upward through the flange 7-6 by the force of the gas spring 7-8. At this time, the cam driver pin 7-4 moves in the cam follower groove 7-5 to be converted into a rotational motion K. This rotational motion is transmitted to the lifter 4 by the lifter gear 5 to rotate the lifter 4 and the workpiece 1 placed thereon.

In the former stage, when the upper mold moves from the top dead center to the bottom dead center, the downward movement is not converted into a rotational movement, and when the upper mold moves from the bottom dead center to the top dead center, the upward movement is not performed. Although an example of conversion to rotational motion has been shown, when the upper die moves from top dead center to bottom dead center, downward motion is converted to rotational motion, and the upper die moves from bottom dead center to top dead center. Embodiments in which upward motion is not converted to rotational motion when moving are also possible.

Subsequently, when the upper mold moves from the top dead center to the bottom dead center, the downward movement is not converted into a rotational movement, and when the upper mold moves from the bottom dead center to the top dead center, the upward movement rotates. The operation of the cylindrical cam / one-way clutch of the embodiment converted into motion will be described in more detail with reference to FIG. 2. A schematic diagram showing the operation of the cylindrical cam / one-way clutch.

When the upper die descends from the top dead center to the bottom dead center, a downward force A is transmitted to the cylindrical cam / one-way clutch portion 7 by the push pin 6.
The cylindrical cam driver 7-1 is pushed down by the downward force A of the push pin 6, and the cam driver pin 7-4 attached to the cylindrical cam driver 7-1 moves B down. At this time, the downward motion B is converted into the rotational motion D by the cam driver pin 7-4 moving in the cam follower groove 7-5 cut by the input-side one-way clutch / cylindrical cam follower 7-3.
However, the one-way clutch rotates the input-side one-way clutch / cylindrical cam follower 7-3, but the output-side one-way clutch 7-2 does not rotate C.
At the same time, the pusher 7-7 is lifted F by the action E of the rod 7-6, and the gas spring 7-8 is compressed.

On the other hand, when the upper die rises from the bottom dead center to the top dead center, the push pin 6 is separated from the cylindrical cam driver 7-1. Then, the pusher 7-7 is pushed down by the force H of the compressed gas spring 7-8, the rod 7-6 is actuated I, and the cylindrical cam driver 7-1 is raised J. The cylindrical cam driver 7- The cam driver pin 7-4 attached to 1 moves up. At this time, the upward motion J is converted into the rotational motion K as the cam driver pin 7-4 moves in the cam follower groove 7-5 cut by the input-side one-way clutch / cylindrical cam follower 7-3.
When the upper die rises from the bottom dead center to the top dead center, unlike the one at the top dead center to the bottom dead center, the one-way clutch allows the input one-way clutch and the cylindrical cam follower 7-3 to be the output one-way clutch. 7-2 also rotates K.

FIG. 3 shows a cylindrical cam structure of the cylindrical cam / one-way clutch portion 7. The vertical movement is turned into a rotational movement by fitting the cam driver pin 7-4 provided on the cylindrical cam driver 7-1 and the cam follower groove 7-5 provided on the input side one-way clutch / cylindrical cam follower 7-3. Converted.

In the cylindrical cam structure of the embodiment, a cam driver pin 7-4 is provided on the cylindrical cam driver 7-1 (inside cam driver), and a cam follower groove 7-5 is provided on the input side one-way clutch / cylindrical cam follower 7-3. It is also possible to provide a cam driver pin on the outside and a cam follower groove on the inside.

In the embodiment, an example in which a hole is made on a constant circumference at a constant angle has been shown. However, if this mechanism is used, the workpiece 1 can be rotated at a constant angle and various processes can be performed. In addition, the gear ratio can be changed by adding transmission parts such as gears, belts, chains, etc. in the middle of the cam follower groove 7-5, and various rotation angles can be obtained. The movement can be easily converted into a large rotational movement, and the timing of the vertical movement and the rotational movement can be accurately taken.

According to the present invention, it is possible to provide a rotary indexing mechanism that eliminates the need for an external power / control device and that synchronizes the vertical movement and the rotary movement with excellent space saving, cost saving, and maintainability.

In addition to press dies, the present invention can be applied to various apparatuses that perform rotational indexing using vertical movement.

1 Workpiece
2 punch
3 dice
4 Lifter
5 Lifter gear
6 Push pin
7 Cylindrical cam / one-way clutch
7-1 Cylindrical cam driver
7-2 One-way clutch on output side
7-3 Input side one-way clutch and cylindrical cam follower
7-4 Cam driver pin
7-5 Cam follower groove 7-6 梃
7-7 pusher
7-8 Gas spring A Force generated when the upper die moves from top dead center to bottom dead center B Downward movement of the cylindrical cam driver C Rotation of the output one-way clutch (does not rotate)
D Input side one-way clutch and cylindrical cam follower rotation E 動作 Operation 1
F Pusher rise
G Push pin operation when the upper mold moves from the bottom dead center to the top dead center
H Gas spring pushes down the pusher
I 動作 operation 2
J Upward movement of cylindrical cam driver
K One-way clutch rotation

Claims (4)

In a mechanism that converts vertical motion into rotational motion and performs rotational indexing at a predetermined angle, it is composed of a cylindrical cam that converts vertical motion into rotational motion and a one-way clutch that restricts rotation in only one direction. A feature of automatic rotation indexing mechanism. The mechanism according to claim 1, wherein the downward movement of the vertical movement is obtained from the operation from the top dead center to the bottom dead center of the press, and the upward movement is performed by a direct force of a spring or a gas spring or an indirect force by a rod. Automatic rotation indexing mechanism obtained. The mechanism according to claim 1, further comprising a cylindrical part comprising a pin that can move up and down inside and is fixed outward, and a cylindrical cam that comprises a cylindrical part grooved on the inside. Automatic rotation index mechanism. The mechanism according to claim 1, further comprising a cylindrical cam composed of a cylindrical part capable of moving up and down on the inside and grooved on the outside and a cylindrical part having a pin fixed inward on the outside. Automatic rotation index mechanism.