JPS6117796Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a device for moving an object up and down, which has a rotary/linear motion conversion mechanism that does not have a self-locking function, such as a rack-and-pinion mechanism, a chain-sprocket mechanism, or a drum-wire winding mechanism. related to improvements.

Conventionally, this type of device has a large amount of movement per rotation of the rotating part compared to a rotary/linear motion conversion mechanism with a self-locking function such as a moving screw.
It is generally used as a vertical movement device for relatively lightweight objects, but since it does not have a self-locking function when you take your hand off the handle shaft or stop driving the electric motor, the weight of the object will cause the handle shaft or electric motor to move. The rotor rotates and the object does not stop and falls.

In such a case, if a frictional force is constantly applied to prevent the object from falling, there is a drawback that a large driving force is required to rotate the object when it rises.

The purpose of this invention is to solve the above-mentioned drawbacks and provide a vertical movement device for an object that can stop the object at a desired position by preventing rotation of the handle shaft due to the object's own weight, and does not have a self-locking function. A handle shaft that moves an object up and down through a rotation/linear motion conversion mechanism, a handle shaft 7 that operates the rotation/linear motion conversion mechanism in the device, a one-way rotation clutch 10 provided on the handle shaft, It has a case 11 with a friction plate that houses a one-way rotating clutch and is rotatably fitted onto the handle shaft, and a friction surface 8a that comes into contact with a friction surface 11a of the case with the friction plate, and is fixed to the machine frame 1. The friction surface 11a of the case with a friction plate capable of adjusting the pressure is connected to the friction surface 8 of the handle shaft support member.
The present invention relates to a device for vertically moving an object, characterized by comprising a spring device that is brought into pressure contact with a.

Next, embodiments shown in the accompanying drawings will be described.

A sliding piece 2 is attached to the dovetail groove of the guide part 1a of the machine frame 1 together with a gib 4 and a clamp bolt 5, and the sliding piece 2 is guided by this guide part 1a so as to slide in the vertical direction. There is. The clamp bolt 5 is used when it is desired to fix the sliding piece 2 whose position has been adjusted in the vertical direction to the machine frame. Further, it is convenient to provide a scale plate 3 on the side surface of the sliding piece 2 in order to adjust the position of the sliding piece 2.

A rack 6 is fixed to the back of the sliding piece 2 by a screw 6a, and the rack 6 is engaged with a pinion 7a fixed to the tip of the handle shaft 7, so that when the handle shaft 7 rotates, It is designed to move up and down. The handle shaft 7 is rotatably supported by a handle shaft support member 8 fixed to the machine frame 1.

The handle shaft 7 is provided with a one-way rotating clutch 10, which is driven into the inner surface of a hole of a case 11 with a friction plate rotatably fitted onto the handle shaft 7.

The one-way rotating clutch 10 is of a type such as a shell-type roller clutch, for example, and when the handle shaft 7 is rotated in the direction of moving the sliding piece 2 upward, it is in a free state with the handle shaft 7, and the handle shaft 7 is rotated in the opposite direction. It is assembled so that when it is rotated, it engages with the handle shaft 7 and rotates in unison with the handle shaft 7.

The flanged cylinder 12 is a case 11 with a friction plate.
It is bolted concentrically to the machine frame 1 on the outside of the
A disc spring 9 is housed between the inner surface of the cylindrical body 12 and the outer surface of the case 11 with a friction plate. The friction surface 11a of the end face of the case 11 with a friction plate is pressed against the friction surface 8a of the shaft support member 8, and the friction force causes the sliding piece 2 and the object attached to it to be compressed. The handle shaft 7 is prevented from rotating under its own weight. The magnitude of the frictional force is determined by changing the deflection of the disk spring 9 by moving the retaining nut 13 in and out, and adjusting the pressing force.

If a thrust bearing (not shown) is provided on the surface of the presser nut 13 in contact with the presser plate 14 so that the presser plate 14 can freely rotate relative to the presser nut 13, the presser plate 14 can rotate without slipping. Therefore, it is convenient.

A handle 15 is fixed to the handle shaft 7 by a pin 7b, and is manually rotated to move objects such as the sliding piece 2 up and down.

Next, as shown in FIGS. 2 and 3, an upper head 18 is fixed to the lower end of the sliding piece 2, and a wire 17 is supplied to the upper head 18 by a guide roller 16. This will be explained using an example of an upper head vertical movement device of an electrical discharge machine.

First, when moving the object, that is, the sliding piece 2 and the upper head 18 attached thereto, by turning the handle 15 counterclockwise, the handle shaft 7 and the one-way rotation clutch 10 become free, and the latch and pinion The sliding piece 2 is raised by the mechanisms 6 and 7a.

When the handle 15 is released from the hand, a rotational force in the opposite direction is applied to the handle shaft by the weight of the sliding piece 2 and the upper head 18 via the rack and pinion mechanism, and the one-way rotation clutch 10 is rotated against the handle shaft 7. Case 11 with friction plates that mesh and are in contact with each other
The friction surface 11a of the end face of and the friction surface 8 of the shaft support member 8
The handle shaft 7 is braked and stopped by the frictional force between the object and the object a, and the object does not fall.

When moving an object downward, when the handle 15 is reversed and rotated clockwise, the one-way rotation clutch 10 and the handle shaft 7 are engaged and integrated, and the case 11 with the friction plate is moved to the shaft support member 8.
It is rotated against the frictional force between the In this case, if the pressure nut 13 is used to set the disc spring 9 to an appropriate pressing force, the handle shaft can be rotated clockwise with the same torque for operating the handle as when the handle is raised.

In conventional electrical discharge machines, only a latch and pinion mechanism was used to position the upper head 18 by moving it up and down depending on the height of the workpiece, so when the handle was released, the upper head would fall under its own weight. However, the device of the present invention has made this operation extremely easy. It should be noted that although an electric discharge machine has been described as an example, it goes without saying that the present invention is not limited to this and can be applied to other machine tools, measuring devices, and the like.

As explained above, in the device of the present invention, the one-way rotation clutch 10 and the case with a friction plate that houses the clutch are provided on the handle shaft, and the friction surface of the friction plate of the case with the friction plate is attached to the shaft support member fixed to the machine body. They are pressed together by a spring device, and even if a rotational force is applied to the handle shaft due to the weight of the object, the handle will remain fixed due to the frictional force between the friction surface of the shaft support member and the friction surface of the case with a friction plate. It is possible to prevent the rotation of the shaft and stop the object at a desired position, and by adjusting the pressing force of the spring appropriately, it is possible to equalize the rotational force applied to the handle shaft when moving the object up and down. Furthermore, since the amount of movement per rotation of the handle is large, the practical effects such as being able to rapidly move and position an object to a required height are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the main parts of the present invention, FIG. 2 is a side view of the main parts showing one embodiment, and FIG. 3 is a cross-sectional view taken from FIG. 1. 1... Machine frame, 2... Sliding piece, 6... Rack, 7
... Handle shaft, 7a ... Pinion, 8 ... Handle shaft support member, 9 ... Belleville spring, 10 ... One-way rotation clutch, 11 ... Case with friction plate, 13
... Presser nut, 14 ... Presser plate, 18 ... Upper head.

Claims (1)

[Scope of utility model registration request] A device for vertically moving an object through a rotation/linear motion conversion mechanism without a self-locking function, which includes a handle shaft 7 for operating the rotation/linear motion conversion mechanism, and a one-way rotation clutch 10 provided on the handle shaft. A case 11 with a friction plate that houses the one-way rotation clutch and is rotatably fitted onto the handle shaft, and a friction surface 11 of the case with the friction plate.
a handle shaft support member 8 fixed to the machine frame 1 and having a friction surface 8a in contact with the handle shaft support member 1; and a spring that presses the friction surface 11a of the case with a friction plate to the friction surface 8a of the handle shaft support member in a pressure adjustable manner. 1. A device for vertically moving an object, which stops the object at a desired position by preventing rotation of a handle shaft based on the weight of the object.