JPS5911780B2 - Especially clutch brake devices in plastic processing machines and cutting machines. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides that clutch and brake pistons slidably guided within clutch and brake cylinders and energized by compressed air move the clutches and brakes into their actuated or released positions. Move to.

The present invention relates to clutch/brake devices, particularly in plastic processing machines and cutting machines.

In plastic processing machines and cutting machines such as presses, a movable mold and a cutting blade are driven by a power source via a power transmission mechanism having a clutch brake device.

The reciprocating motion of the movable type, cutting blade, etc. is required to be able to be arbitrarily controlled by connection to a power source via a clutch at a desired position, braking by a brake at a desired position, etc.

The clutch that transmits the rotational force from the power source to the plastic processing machine and cutting machine has a clutch cylinder and a clutch piston that can slide freely inside the clutch cylinder, and compressed air acts on one side of the clutch piston. The piston is then displaced to frictionally connect the clutch output shaft to its input side, and rotational force is transmitted through the clutch.

Furthermore, when the action of the compressed air stops, the clutch piston is pushed back by the force of the spring acting on the other side of the clutch piston, cutting off the transmission of rotational force from the clutch input side to the clutch output shaft.

On the other hand, a brake for applying braking to a clutch output shaft has a brake cylinder and a brake piston that is slidable inside the cylinder, and when compressed air acts on one side of the brake piston, the piston is displaced in one direction. , when the compressed air is cut off, the spring on the other side of the brake piston displaces the brake piston in the other direction.

The brake is actuated and released by this displacement of the brake piston.

Such a latch brake device is configured so that the clutch is connected after the brake is released.
Compressed air at full pressure is applied to the clutch cylinder chamber to engage the clutch, and compressed air at full pressure is similarly applied to the brake cylinder chamber to release the brake. .

In this type of clutch brake device, a significant portion of the compressed air energy remains inside the clutch cylinder and brake cylinder even after the supply of compressed air is cut off, and when an emergency stop is to be performed, a large amount of compressed air is Because of the residual amount, the brake piston cannot be activated to apply the brakes in the minimum amount of time.

In order to avoid this drawback, it has also been proposed to maintain the pressure in the brake cylinder at the minimum air pressure required for brake release throughout the entire stroke of the forming or cutting machine.

Although this results in less compressed air being required, the air evacuation time during braking is hardly reduced due to the relatively low air pressure.

On the other hand, it has also been proposed to control the pressure of compressed air in two stages.

In this case, the first pressure is first applied to the clutch piston, then the pressure is increased and the second pressure is applied to the clutch piston, but switching from the first pressure to the second pressure is complicated. Therefore, accurate control is difficult.

The present invention was made in view of the problems described above, and its purpose is to operate clutches and brakes by supplying and cutting off compressed air in the most suitable state for the operation of plastic processing machines and cutting machines. It is an object of the present invention to provide a clutch brake device which can be operated with a small amount of compressed air, has excellent emergency stop characteristics, and whose dimensions can be reduced by weakening springs and the like.

According to the present invention, there is provided a clutch that frictionally connects an output shaft to an input shaft, and a brake that applies braking to the output shaft, and the clutch and the brake each have a clutch cylinder and a brake cylinder, and the clutch and the brake each have a clutch cylinder and a brake cylinder. A clutch piston and a brake piston are inserted inside the clutch cylinder so as to be slidable in the axial direction, and one side of the clutch piston inside the clutch cylinder is provided with a cylinder chamber that receives compressed air and displaces the clutch piston in the direction of clutch operation. The other side of the clutch piston in the clutch cylinder is provided with a spring that presses the clutch piston in the clutch release direction, while the one side of the brake piston in the brake cylinder is provided with a spring that receives compressed air to push the brake piston. A cylinder chamber is provided to displace the brake piston in one direction, and a spring is provided on the other side of the brake piston in the brake cylinder to press the brake piston in the other direction.The brake is actuated and released by displacement of the brake piston. In a clutch brake device for a plastic processing machine and a cutting machine, in particular, at least two cylinder chambers separated from each other are formed on one side of the clutch piston in the clutch cylinder and on one side of the brake piston in the brake cylinder, respectively. compressed air can be separately supplied to these at least four cylinder chambers, and each of the four cylinder chambers is connected to a source of compressed air via a separate conduit each having a control valve that can be opened and closed.

Thanks to the invention, the clutches and brakes can be reduced in size, switching with a stable switching rhythm is possible, less compressed air is consumed, and the operating time in the event of an emergency stop is shortened.

Hereinafter, the present invention will be described in detail with reference to the drawings.

In the figure, a clutch cylinder 1 constitutes the main body of the clutch, and a clutch piston 3 is provided inside the cylinder so as to be slidable in the axial direction.

The clutch cylinder 1 constitutes an input member of the clutch, is connected to a rotational drive source (not shown), is supported by a bearing (not shown), and is driven to rotate around a horizontal axis in the figure. It is.

When the clutch piston 3 is displaced to the right within the clutch cylinder 1, the annular member (shown with a mesh cross section) of the clutch disc fixed to the left end of the clutch output shaft 24 engages the clutch piston 3 and the end wall of the clutch cylinder 1. The clutch cylinder 1 and the clutch disk come into frictional contact, and the rotation of the clutch cylinder 1 is transmitted to the clutch output shaft 24.

The rotation of the clutch output shaft 24 is transmitted to a plastic processing machine such as a press or a cutting machine by a transmission means such as a gear shown in the middle thereof, and a movable mold of the press, a cutting blade, etc. are driven back and forth.

Braking on the clutch output shaft 24 is applied by a brake shown to the right thereof.

The brake has a brake cylinder 2 and a brake piston 4 that is slidable inside the brake cylinder 2, and the brake cylinder 2 is fixed to a frame of a plastic processing machine or a cutting machine.

The left end of the brake piston 4 that protrudes to the outside of the brake cylinder 2 is enlarged into a flange shape, and a fixed plate member is immovably provided opposite to the left end of the left end.

The annular member (shown as a mesh cross section) of the brake disc at the right end of the clutch output shaft 24 is connected to the brake piston 4.
and the fixed plate member.

Therefore, the brake piston 4 moves to the left and the output shaft 24
When the brake disc of is clamped between the fixed plate member,
Braking is applied to the output shaft 24.

The clutch piston 3 is preferably designed as a two-stage piston with clutch piston pressure surfaces 5, 6 and is held in the clutch cylinder 1 by a compression spring 22 in a release position to the left in the drawing.

The clutch cylinder 1 is formed as a member facing the clutch piston 3, and has stepped clutch cylinder surfaces 7, 8.

Each cylinder chamber formed between the opposing surfaces 5, 7 and 6, 8 is connected to a compressed air supply.

That is, a control valve 15 that can be opened and closed and a conduit 14a connected to the compressed air tank 13 via a conduit 14 are connected to the clutch cylinder surface I, while a control valve 1T and a conduit 14a are connected to the clutch cylinder surface 8. A conduit 16a is connected via the conduit 16 to the compressed air tank 13.

The brake piston 4 is likewise designed as a two-stage piston with brake piston pressure surfaces 9, 10 and is guided in the brake cylinder 2 with a stepped brake cylinder surface 11, 12 as a counterpart for the brake piston 4. Ru.

The brake piston 4 is held in a closed position to the left in the figure by a compression spring 23.

Each cylinder chamber formed between the opposing surfaces 9.degree. 12 and 10, 11 is likewise connected separately to a compressed air supply.

That is, a conduit 18a connected to the compressed air tank 13 via a control valve 19 and a conduit 18 is connected to the brake cylinder surface 11, while the brake cylinder surface 1
2 is connected to the compressed air tank 1 via a control valve 21 and a conduit 20.
A conduit 20a connected to No. 3 is connected.

The operation of the clutch brake device described above is as follows.

When starting the operation of the plastic processing machine or the cutting machine, the control valve 21 is opened in advance, and therefore air pressure acts on the pressure receiving surface 9 of the brake piston 4 via the conduit 20a, and the force due to this air pressure is applied to the compression spring 23. A relatively light brake is applied to the clutch output shaft 24.

To start operation, the control valves 17 and 19 are first opened in this state.

As a result, the compressed air in the compressed air tank 13 passes through the control valve 17 and the conduit 16a to the pressure receiving surface 6 of the clutch piston 3.
It also acts on the pressure receiving surface 10 of the brake piston 4 via the control valve 19 and the conduit 18a.

Therefore, the clutch piston 3 is displaced to the right while compressing the compression spring 22, and frictionally connects the clutch output shaft 24 to the rotating clutch cylinder 1.

At the same time, the brake piston 4 is displaced to the right while compressing the compression spring 23 due to the force acting on both pressure receiving surfaces 9 and 10.
The right end disk of the clutch output shaft 24 is released, and the brake on the clutch output shaft 24 is completely released.

Therefore, the clutch output shaft 24 starts to be accelerated.

Subsequently, the control valve 15 is opened by a control device actuated, for example by a cam or by time, and the compressed air in the compressed air tank 13 acts via the conduit 14a on the pressure surface 5 of the clutch piston, so that the clutch piston 3
The frictional contact force between the clutch cylinder 1 and the clutch cylinder 1 is further increased, and the high rated torque required for carrying out the working process can be transmitted by the clutch, and working processes such as pressing and cutting are performed.

After the working stroke is completed, the control valve 15 is closed by the control device, the action of air pressure on the clutch piston pressure receiving surface 5 is stopped, and the transmitted torque of the clutch is reduced.

During this time, the press movable die, cutting blade, etc. after performing the working stroke are moving to a return stroke, and are returned to the starting position of the working stroke with the transmission torque of the clutch reduced.

In this way, even if the transmission torque of the clutch is small, the torque is transmitted without any problem during the return stroke which does not require a large torque.

Then, the control device closes the control valves 17 and 19, and the clutch piston 3 is thereby forced into the compression spring 22.
The force returns to the original position, and the power transmission by the clutch is completely cut off, and the brake piston 4 also returns to its original state due to the compression spring 23, exerting a relatively light braking force. It stops at the starting position of its working stroke.

The braking force for this stop may be relatively small.

Thereafter, the control valve 21 remains open, a portion of the acting force of the compression spring 23 is reduced, and a relatively small braking torque acts on the clutch output shaft 24 until the start of the next working stroke.

As described above, by keeping the brake piston 4 in a state where it applies a light braking force except during the operation and return strokes,
When the braking force is fully released, extremely quick action is obtained.

Further, the clutch piston 3 transmits a small torque at the start of the working stroke and during the return stroke of a plastic processing machine or a cutting machine, and can transmit the high rated torque necessary for the working stroke during the working stroke. Therefore, there is no need to constantly apply high transmission torque.

Furthermore, at the moment when the compression spring 22 of the clutch moves the clutch piston 3 backward and releases the clutch, the air pressure that was acting on the pressure receiving surface 5 of the clutch piston 3 has already disappeared and is acting on the pressure receiving surface 6. Since the air pressure has just been cut off, the compression spring 22 only has to push the clutch piston 3 so that the air is discharged mainly by the pressure receiving surface 6.
Compared to the conventional example in which air pressure acts over the entire cross section of the clutch piston 3, the compression spring 22 can be weaker, and as a result, the compression spring can be made smaller, and as a result, the size of the clutch can also be smaller.

If an emergency situation occurs during the action process, the four control valves 15, 17, 19, and 21 are closed simultaneously.

This eliminates all compressed air action on the clutch and brake, the clutch is released, and the brake exerts its full braking force via the compression spring 23 on the clutch output shaft 24 .

Therefore, the work process is interrupted instantly.

As described above, according to the present invention, by providing at least two independent air pressure receiving surfaces on each of the clutch piston and the brake piston, it is possible to operate the clutch brake device with a stable switching rhythm and with a small amount of air consumption. It is also possible to reduce the size of the clutch and shorten the operating time during an emergency stop.

[Brief explanation of drawings]

The figure is a schematic configuration diagram of a clutch brake device according to the present invention. 1...Clutch cylinder, 2...Brake cylinder, 3...Clutch piston, 4...
... Brake piston, 5, 6 ... Clutch piston pressure receiving surface, 7.8 ... Clutch cylinder surface, 9, 10 ... Brake piston pressure receiving surface, 11 .12...Brake cylinder surface, 13.
...Compressed air tank, 14, 14a... Conduit, 15... Control valve, 16, 16a...
Conduit, 17... Control valve, 18, 18a...
... Conduit, 19... Control valve, 20, 20a...
... Conduit, 21 ... Control valve.

Claims (1)

[Claims] 1 It has a clutch that frictionally connects the output shaft to the input shaft, and a brake that applies braking to the output shaft, and the clutch and the brake each have a clutch cylinder and a brake cylinder, and a clutch piston is inside them. A brake piston and a brake piston are respectively inserted slidably in the axial direction, and one side of the clutch piston inside the clutch cylinder is provided with a cylinder chamber that receives compressed air and displaces the clutch piston in the clutch activation direction. A spring is provided on the other side of the clutch piston to press the clutch piston in the direction of releasing the clutch.
On the other hand, one side of the brake piston in the brake cylinder is provided with a cylinder chamber that receives compressed air to displace the brake piston in one direction, and the other side of the brake piston in the brake cylinder is provided with a cylinder chamber that displaces the brake piston in one direction. Particularly in clutch brake devices for plastic processing machines and cutting machines, the brake is actuated and released by the displacement of the brake piston, and one side of the clutch piston in the clutch cylinder and the brake cylinder At least two cylinder chambers separated from each other are formed on each side of the brake piston of the brake piston, so that compressed air can be separately supplied to each of the at least four cylinder chambers, and each of the four cylinder chambers is A clutch/brake device, characterized in that the clutch/brake device is connected to a source of compressed air via separate conduits each having a control valve that can be opened and closed.