JPH0270332A - Fluid pressure controller for cam mechanism - Google Patents

Abstract

PURPOSE:To limit an operating speed and to prevent the impact at the time of abutting by constituting the title controller so that a discharge side of a fluid which flows out at the time of operating a cam follower of a fluid actuator in the direction for pressing it against a cam can be switched freely to a reduction state and a release state of a discharge flow rate. CONSTITUTION:Force for pressing a cam follower 27 against a cam 26 is switched from a released state to an operating state by a fluid pressure actuator 41. In this case, a fluid discharge side of the fluid pressure actuator 41 is set to a reduction state and an operating speed is suppressed, and the cam follower 27 is allowed to abut on the cam 26 without generating an impact. Subsequently, the fluid discharge side of the fluid pressure actuator 41 is released from its reduction and a motion of the cam 26 is transmitted to a driven body 6 through the cam follower 27. In this case, the cam follower 27 is not behind the motion of the cam 26, and the state that the cam follower 27 is pressed against the cam 26 can be maintained. In such a way, it is prevented that an impact is generated at the time when the cam follower abuts on the cam.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for controlling the movement of a cam mechanism via a fluid pressure actuator.

(Prior Art) Fig. 10 and Fig. 11 show a conventional example of a fluid pressure control device for a cam mechanism used in a transfer device of a press machine. and a pneumatic cylinder 82 as a fluid pressure actuator.

The cam 80 is rotatably driven in the direction of the arrow in the figure by a drive device not shown.

The cam follower 82 is operatively connected to a driven body 83 via a link mechanism. In the conventional example, the driven body 83 operates the transfer device in the clamping/unclamping direction and the feeding direction of the press material via a binion rack.

The pneumatic cylinder 81 is interlocked and connected to the cam follower 82, and is reciprocated by pressurized air supplied from a pneumatic source 84 through a pneumatic circuit.
2 is pressed against the cam 80 and backed up, and the cam follower 82 is separated from the cam 80 as shown in FIG. 11.

In this way, by pressing the cam follower 82 against the cam 80, the driven body 83 follows the movement of the cam 80,
The transfer device operates in a predetermined pattern in the clamping/unclamping direction and the feeding direction of the press material.

In addition, when the cam follower 82 separates from the cam 80, the driven body 83 moves independently of the cam 80, and the transfer device operates independently in the clamp/unclamp direction and the feed direction, and performs maintenance and press die molding. It is possible to align with

In the operating circuit of the pneumatic cylinder 81, 85 is a pressure reducing valve, 86 is an electromagnetic switching valve, 87 is a check valve for applying backup force, 88 is a throttle valve for applying backup force, 89 is a check valve for canceling backup force, 90 is a backup release throttle valve, 91 is an air tank, and 92 is a muffler.

By switching the switching valve 86, the pneumatic circuit applies a backup force that presses the cam follower 82 against the cam 80 as shown in the first O diagram, and forces the cam follower 82 away from the cam 80 as shown in the eleventh diagram. The state is switched.

In addition, the backup force addition throttle valve 88 controls the operating speed of the pneumatic cylinder 81 in order to prevent the cam follower 82 from suddenly colliding with the cam 80 when the hack-up force is switched from the release state to the application state. It plays a suppressing function.

(Problems to be Solved by the Invention) In the conventional fluid pressure control device described above, when the cam follower 82 is pressed against the cam 80 to apply a backup force and the driven body 83 follows the movement of the cam 80, the movement of the cam 80 The pneumatic cylinder 81 reciprocates in response to the movement of the cam follower 82. In the reciprocating movement of the pneumatic cylinder 81 in this driven body following state, when moving in the direction opposite to the direction in which the backup force is applied, the cam follower 82 moves the cam 8
Since the cam 80 and the cam follower 82 are pressed against each other by the backup force, the cam 80 and the cam follower 82 will not be separated from each other.

However, in the reciprocating movement of the pneumatic cylinder 81 in the driven body following state, when moving in the direction in which the backup force is applied, the movement of the pneumatic cylinder 81 is suppressed due to the presence of the backup force adding throttle valve 88 described above. cam follower 82
There has been a problem in that the driven body 83 is unable to follow the movement of the cam 80 because it lags behind the movement of the cam 80 and separates from the cam 80.

The present invention aims to solve the above problems.

(Means for Solving the Problems) The present invention is characterized in that a cam 26, a cam follower 27 interlockingly connected to the driven body 6, and a fluid pressure actuator 41 interlockingly connected to the cam follower 27. The driven body 6 is in a state in which the cam follower 27 is pressed against the cam 26 by the fluid pressure actuator 41 and follows the movement of the cam 26, and a state in which the cam follower 27 is separated from the cam 26 by the fluid pressure actuator 41 and follows the movement of the cam 26. In a fluid pressure control device for a cam mechanism that can be freely switched between a state where the cam follower 27 of the fluid pressure actuator 41 moves independently of the cam 26
The point is that the discharge side of the fluid discharged when operating in the direction of pressing the discharge fluid can be freely switched between a state where the flow rate of the discharged fluid is throttled and a state where the throttle is released.

(Function) The cam follower 27 is activated by the fluid pressure actuator 41.
When switching from a released state to a state in which the force pressing against the cam 26 is applied, the fluid discharge side of the fluid pressure actuator 41 is throttled, the operating speed of the fluid pressure actuator 41 is suppressed, and the cam follower 27 is pressed against the cam 26. contact without causing any impact.

Thereafter, the fluid discharge side of the fluid pressure actuator 41 is switched to the throttle release state, and the movement of the cam 26 is transmitted to the driven body 6 via the cam follower 27.

At this time, the cam follower 2 of the fluid pressure actuator 41
The movement in the direction of pressing 7 against the cam 20 is not suppressed because the flow rate of the discharged fluid during this movement is not restricted, and the cam follower 27 does not lag behind the movement of the cam 26, and the cam of the cam follower 27 26 can be maintained.

(Example) Embodiments of the present invention will be described below based on the drawings.

4 to 9 show a transfer device of a press machine to which a pneumatic control device for a cam mechanism according to an embodiment of the present invention is applied.

This transfer device includes four pillars 2 attached to a press body l, and a clamp mechanism 3,
A pair of front and rear transfer beams (driven bodies) 6 are provided via a left and right feeding mechanism 4 and a vertical feeding mechanism 5.

Each transfer beam 6 is attached with a clamping claw 7 made of a press-formed material, and each end is supported by the upper part of a lift rod 8 of the vertical feed mechanism 5 so as to be movable left and right.

As shown in FIGS. 6 and 7, each lift rod 8 of the vertical feed mechanism 5 has a housing 9 attached to the support column 2.
It is supported via a cylindrical body 10 so as to be vertically movable, and is operatively connected to a shaft 12 via a link pinion 11.

Each pinion shaft I2 is rotatably supported by the housing 9 and operatively connected to a rack 14 via a pinion 13. The rack 14 is supported by the housing 9 in a reciprocating manner and is operatively connected to a cam follower (not shown). The cam follower has a cam shaft 22 which will be described later.
A backup force is applied to the cam (not shown) attached to the cam by a backup pneumatic cylinder (not shown) so as to press it.

A gear is formed on the outer periphery of the cylindrical body 10, and is supported by the housing 9 via a rack 15.

As shown in FIGS. 4 and 5, each transfer beam 6
One end of each is connected to a connecting pin 17 of a transmission link 16 of the left-right feeding mechanism 4 so as to be vertically movable. A cam follower 19 is operatively connected to each transmission link 16 via an interlocking lever 18 . Each cam follower 19 is attached to the housing 9 so as to be swingable about a pivot 20.

A backup force is applied to each cam follower 19 so that it is pressed against the cam 21 by a backup pneumatic cylinder (not shown).

Each cam 21 is attached to a camshaft 22, and the camshaft 22
is connected to a drive motor 25 via an electromagnetic clutch 23 and a pressure reducing gear box 24.

As shown in FIG. 4, FIG. 5, FIG. 8, and FIG. 9, a pair of cams 26 are attached to the camshaft 22, and a cam follower 27 is in contact with each cam 26. 27 is attached to the housing 9 so as to be swingable about a pivot 28. A first clamp lever 3 is attached to each of the cam followers 27 via a link rond 29, 30, 31, 32 and a lever 33 pivotally supported on the housing 9.
4 are connected. Each of the first clamp levers 34 is swingably attached to the housing 9 and connected to a first transmission link 35 . Each of the first transmission links 35 is connected to a transmission bar 36 , and each of the first transmission links 35 is connected to a transmission bar 36 .
is supported by the pillar 2 so as to be movable laterally and is connected to the second transmission link 37. This second transmission link 37
A second clamp lever (not shown) is connected to the housing 9, and like the first clamp lever 34, this second clamp lever is swingably attached to the housing 9.

A clamp pinion 39 is attached concentrically above the pivot axis 35 of the first and second clamp levers. Clamp rack 4 is attached to each clamp pinion 39.
0 are engaged with each other, and this clamp rack 40 is connected to the cylindrical body 1.
It is meshed with the outer peripheral gear of 0.

Further, the outer ends of the eleventh second transmission links 35 and 37 are respectively connected to backup pneumatic cylinders 41, and the cam followers y-27 and cam 2 are connected to backup pneumatic cylinders 41.
A back-up force is applied to press against 6.

Note that the pneumatic cylinder 41 is attached to the housing 9.

In the above transfer device, each cam follower 19
．． 27 cam 21. With the cam shaft 22 pressed against the 26
When the cams 21 and 26 are rotationally driven, the movement of each cam 21.26 is transmitted to the clamp mechanism 3, the left/right feed mechanism 4, and the vertical feed mechanism 5 via the cam followers 19.27.

Then, the movement of the cam follower 27 of the clamp mechanism 3 is transmitted to the clamp pinion 39, and the clamp pinion 39
Due to the reciprocating motion of the clamp rack 4o due to the rotation of the cylinder 10, the cylinder body 10 rotates and moves back and forth along the rack 15 of the housing 9, and both transfer beams 6 operate in the clamping direction in which they approach each other and in the unclamping direction in which they move away from each other.

Furthermore, the transfer beam 6 moves left and right due to the movement of the cam follower 19 of the left and right feed mechanism 4.

Furthermore, the movement of the cam follower of the vertical feed mechanism 5 is transmitted to the rack 14, and the reciprocating motion of the rack 14 rotates the pinion shaft 12, causing the transfer beam 6 to move up and down via the lift rod 8.

Since each cam follower 19.27 is pressed against the cam 21.26, the movement of the transfer beam 6 follows the movement of each cam 21.26, and automatically feeds a predetermined press material. .

1 to 3, a pneumatic circuit for applying a hack-up force to press the cam follower 27 against the cam 26 will be explained using the clamp mechanism 3 as an example.

In this pneumatic circuit, 42 is a pneumatic source, 43 is a pressure reducing valve,
44 is the first electromagnetic switching valve, 45 is the air tank, and 46 is the second
Electromagnetic switching valve, 47 is an exhaust switching valve, 48 is a third electromagnetic switching valve, 49 is a variable throttle valve for applying backup force, 50 is a check valve for applying backup force, 51 is a check valve, 52 is a second
Pressure reducing valve, 53 is a variable throttle valve for releasing backup force, 54
is a check valve for releasing backup force.

In the above pneumatic circuit, FIG. 1 shows a state in which the pneumatic cylinder 41 presses the cam follower 27 against the cam 26 to apply a backup force, and pressurized air from the pneumatic source 42 is flowing through the first switching valve 44. is supplied to the pneumatic cylinder 41. When the cam 26 is rotated in this state,
The cam follower 27 is moved by the pneumatic cylinder 41 in the direction in which the pressing force is applied and in the opposite direction to the direction in which the pressing force is applied. When the cam 26 and the cam follower 27 move in the opposite direction to the direction in which the pressing force is applied, the cam 26 and the cam follower 27 do not separate because the hack-up force is applied by the pneumatic cylinder 41. Furthermore, when the cam follower 27 moves in the direction in which the pressing force is applied, the air discharged from the pneumatic cylinder 41 is exhausted through the exhaust switching valve 47 without restricting the discharge flow rate. is not suppressed, so the cam follower 27 does not lag behind the movement of the cam 26 (,
The cam follower 27 and the cam 26 are always in contact with each other.

Next, when the cam follower 27 is separated from the cam 26 and the transfer beam 6 is moved independently of the movement of the cam 26 for maintenance, adjustment, etc., the state shown in FIG. 1 is changed to the state shown in FIG. 2. That is, by switching the second switching valve 46, the exhaust switching valve 47 is switched to a non-evacuation state, and by switching the first electromagnetic switching valve 44 and the third electromagnetic switching valve 48, the pneumatic cylinder 41 is switched to the cam follower 27. 26.

As a result, the transfer beam 6 operates without following the movement of the cam 26.

Thereafter, when the cam follower 27 is brought into contact with the cam 26, the state shown in FIG. 2 is changed to the state shown in FIG. 3. That is, by switching between the first electromagnetic switching valve 44 and the third electromagnetic switching valve 48, the pneumatic cylinder 41 is operated in the direction in which the cam follower 27 moves toward the cam 26.

At this time, the second electromagnetic switching valve 46 is not switched (the exhaust switching valve 47 remains in the non-evacuation state).

As a result, the cam follower 32 is pressed against the cam 26 by the operation of the pneumatic cylinder 41, but the flow rate of the exhaust air when the pneumatic cylinder 41 is operated is throttled by the backup force adding throttle valve 49. Therefore, the operating speed of the pneumatic cylinder 41 is suppressed. Therefore, no impact is generated when the cam follower 27 contacts the cam 26.

Then, when the transfer beam 6 is operated again following the cam 26, the cam follower 27 is moved to follow the cam 26.
After the second electromagnetic switching valve 46 is switched, the exhaust switching valve 47 is brought into the exhaust state, and the state shown in FIG. 1 is again achieved.

Although the above pneumatic circuit is exemplified for the clamp mechanism 3, similar pneumatic circuits are also provided for each cam mechanism of the left-right feed mechanism 4 and the vertical feed mechanism 5, and the transfer beam 6 is connected to the clamp direction and the left-right feed mechanism. It is possible to switch between a movement that follows the movement of each cam and an independent movement in any direction, including the vertical feeding direction and the vertical feeding direction.

In addition, although the above embodiment shows an application of the present invention to a transfer device of a press machine, it can also be applied to a device equipped with a cam mechanism other than this, and a device equipped with a fluid pressure actuator other than a pneumatic cylinder. It can also be applied to things.

In addition, the circuit configuration is not limited to the above, and the discharge side of the fluid discharged when the cam follower of the fluid pressure actuator is operated in the direction of pressing the cam is switched between the throttle state and the throttle release state of the discharge fluid flow rate. It is fine as long as it is freely available.

(Effects of the Invention) According to the present invention, when the fluid pressure actuator applies a hack-up force to press the cam follower against the cam and causes the driven body to follow the cam, when the fluid pressure actuator moves in the direction of applying the backup force, The discharge fluid flow rate of is discharged without being throttled. As a result, the operating speed of the fluid pressure cylinder is not suppressed, the movement of the cam follower does not lag behind the movement of the cam, and there is no problem in the ability of the driven body to follow the cam.

Moreover, when the cam follower is moved away from the cam and the driven body moves independently of the cam, when the cam follower is brought into contact with the cam, the flow rate of fluid discharged from the fluid pressure cylinder is throttled. Actuation speed is reduced. Thereby, no impact is generated when the cam follower contacts the cam.

[Brief explanation of the drawing]

Figures 1 to 9 relate to embodiments of the present invention, Figures 1 to 3 are diagrams showing different states of the pneumatic circuit of the transfer device of the press, and Figure 4 is a plan view of the transfer device. Figure 5 is a cross-sectional view taken along line A-A in Figure 4, Figure 6 is a cross-sectional view taken along line B-B in Figure 5, and Figure 7 is a cross-sectional view taken along line C-C in Figure 6.
NIA sectional view, Figure 8 is the DD line sectional view of Figure 4, Figure 9
The figure is a sectional view taken along the line E--E in FIG. 8, and FIGS. 10 and 11 are diagrams showing different states of pneumatic circuit diagrams of a transfer device of a conventional press machine. 6...Transfer beam, 26...Cam, 27.
...Cam follower, 41...pneumatic cylinder. Figure 1,

Claims (1)

[Claims] (1) A cam 26, a cam follower 27 interlockingly connected to the driven body 6, and a fluid pressure actuator 41 interlockingly connected to the cam follower 27. 27
The cam follower 27 can be freely switched between a state in which the cam follower 27 is pressed against the cam 26 and follows the movement of the cam 26, and a state in which the cam follower 27 is separated from the cam 26 by the fluid pressure actuator 41 and moves independently of the cam 26. In the fluid pressure control device of the cam mechanism, the discharge side of the fluid discharged when the cam follower 27 of the fluid pressure actuator 41 is operated in the direction of pressing the cam 26 is switched between a throttle state and a throttle release state of the discharge fluid flow rate. A fluid pressure control device using a cam mechanism, characterized in that the cam mechanism is flexible.