JPH0118313Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a clamp device that clamps a workpiece using a reciprocating engine.

(Prior Art) A clamping device as shown in FIG. 1 has conventionally been used as a device for clamping a workpiece in an assembly process, an inspection process, or the like.

That is, a clamp arm 2 and a guide arm 3 are pivotally supported on the main body 1 by shafts 2a and 3a, and the ends of the clamp arm 2 and the guide arm 3 are connected to an actuator 4 fixed to the main body 1, respectively.
The piston rod 5 is connected to the tip of the piston rod 5.
Then, as the piston rod 5 reciprocates in the horizontal direction, the clamp arm 2 and the guide arm 3 open upward and downward about the shafts 2a and 3a, and the workpiece W is placed in a clamped or unclamped state. You will be killed.
Further, regarding the guide arm 3, a stopper 6 is provided to prevent the horizontal angle necessary for the work process from being distorted due to an error in the stroke of the piston. Note that FIG. 1 shows a state in which the workpiece W is clamped.

In addition, as shown in FIG. 2, there is a type in which the tip of the piston rod 5 is bifurcated and the actuator 4 is integrated into one.

[The problem that the idea aims to solve]

The clamp device shown in FIG. 1 has the following problems.

Since the actuator 4 is attached to the main body 1 in a direction in which the piston rod 5 reciprocates horizontally, the entire clamping device inevitably has a horizontally elongated shape and requires a large area.
This is disadvantageous in terms of arrangement with other mechanical devices in a factory with limited space.

Since the piston rod 5 is structured to reciprocate horizontally, two sets of actuators 4 must be provided. This means that compared to a clamp device that uses only one set of actuators, the number of actuator increases increases the number of causes of malfunction of the clamp device due to actuator failure. This can be said to be disadvantageous from the viewpoint of

A stopper 6 is provided to maintain a predetermined horizontal angle of the guide arm 3, but if the error in the stroke of the piston is severe, contact between the tip of the piston rod 5 and the stopper 6 may cause the actuator to There is a risk of damaging the mechanism of 4.

Furthermore, in the conventional clamp device shown in FIG. 2, the clamp arm 2 and the guide arm 3 are connected to the shaft 2.
The opening action in the vertical direction about a and the axis 3a is performed at the same time, and the opening angles in the vertical direction are the same as shown by the dashed line in FIG. However, in general, the work process
When moving from clamped state to unclamped state,
The opening action of each arm requires a time lag, such that the clamp arm 2 opens upward first, and then the guide arm 3 opens downward. Moreover, the upward opening angle of the clamp arm 2 in the unclamped state is required to be large, and conversely, the downward opening angle of the guide arm 3 is often required to be small. Therefore, a clamping device having a structure as shown in FIG. 2 cannot be adopted.

[Means to solve the problem]

In order to solve the above problems, the present invention includes a clamp arm having a long hole at one end, a guide arm bent into an L shape and having a roller at one end, and a flat roller contact surface that is continuous with the roller contact surface. The clamp rod has a recessed groove.

These are attached to the main body as follows.

That is, the clamp arm is positioned on the upper side and the guide arm is positioned on the lower side, and is pivoted on the main body with a predetermined distance apart, and the roller contact surface moves parallel to a line connecting the centers of the pivot support, and the roller The clamp rod is attached to the main body so that the guide arm remains approximately horizontal while the roller is in contact with the contact surface.

On the other hand, the clamp arm has an elongated hole connected to the clamp rod with a pin so that the clamp arm rotates around the shaft support as the clamp rod moves while the roller is guided by the roller contact surface, and opens and closes from clamping to unclamping. The roller is guided by the groove when the clamp arm is unclamped.

[Effect]

With this configuration, when the clamp rod is moved, the clamp arm swings around the shaft because it is pin-coupled to the elongated hole, and the guide arm is guided by the roller contact surface and groove of the clamp rod. It is moved around the axis by guide rollers.

At this time, the guide arm remains stationary while the roller is guided by the roller contact surface, and is moved in the opening direction while the roller is guided by the groove.

(Example) An example of the present invention will be described with reference to FIG.
Note that FIG. 3 shows a state in which the workpiece W is clamped.

In the figure, 2 is a clamp arm, and 3 is a guide arm. An elongated hole 9 is provided at the end of the clamp arm 2, and a roller 8 is provided at one end of the guide arm 3.

The clamp arm 2 and the guide arm 3 are opposed to each other and are pivotally supported on the main body 1 by shafts 2a and 3a. Reference numeral 6 denotes a clamp rod, and the clamp rod 6 is formed with a flat roller contact surface 6b and a recessed groove 6a continuous to the flat roller contact surface 6b.
The clamp rod 6 is provided on the main body 1 so as to slide approximately parallel to a line connecting the centers of the shafts 2a and 3a. 4 is an actuator that slides the clamp rod 6;
The rod 5 is connected to a clamp rod 6 via a connecting member 7.

The clamp arm 2 and the clamp rod 6 are connected by a pin 10 fitted into an elongated hole 9. Due to this connection, the clamp arm 2 swings about the shaft 2a as the clamp rod 6 slides.
A coil spring (not shown) is attached to the shaft 2a so that a spring force acts in the direction in which the clamp arm 2 clamps.
is provided.

On the other hand, the roller 8 of the guide arm 3 is guided along the roller contact surface 6b and the groove 6a, and the guide arm 3 moves around the shaft 3a in accordance with this guidance. This roller 8 is pressed against the roller contact surface 6b of the clamp rod 6 with a constant force due to the weight of the guide arm 3 and the weight of the workpiece W. It is also possible to attach a coil spring to the guide arm 3a so as to always urge the guide arm 3 to rotate in the counterclockwise direction).

In FIG. 3, the connecting member 7 is fixed to the tip of the clamp rod 6, but it is of course possible to fix it in another position, for example, near the back surface of the groove 6a.

Next, the operation of the clamp device having such a configuration will be explained. In order to change the workpiece W from the clamped state shown in FIG. 3 to the unclamped state, the actuator 4 is operated and the piston rod 5 is
hang down. Then, the clamp rod 6 also hangs down at the same time, and the clamp arm 2, which was holding down the workpiece W by the force of the coil spring described above, moves around the shaft 2 as the clamp rod 6 moves, as shown in FIG.
It will be in a state where it is opened upward with center a. At this time, the roller 8 attached to the end of the guide arm 3 rotates on the roller contact surface 6b of the clamp rod 6 until it comes to just before the groove 6a, and is kept constant due to the aforementioned own weight of the guide arm 3 and the weight of the workpiece W. Since the guide arm 3 is pressed against the roller contact surface by the force of , even if the clamp rod 6 moves, the guide arm 3 hardly swings and remains in its original state. When the clamp rod 6 is further lowered, the clamp arm 2 connected to the clamp rod 6 is further opened upward as shown in FIG. 5, while the roller 8 attached to the end of the guide arm 3 is depressed into the groove 6a. At this time, the tip of the guide arm 3 moves downward by a distance h, but this distance h is a small distance corresponding to the depth d of the groove 6a. That is, by connecting the clamp arm 2 to the clamp rod 6, the upward opening angle of the clamp arm 2 becomes large corresponding to the moving distance of the clamp rod 6, while the guide arm 3
does not move immediately even if the clamp rod 6 and clamp arm 2 move, and the roller 8 does not move immediately when the clamp rod 6 and the clamp arm 2 move.
Only when it falls to point a does it begin to open slightly downward.

In this embodiment, since the roller 8 is attached to the end of the guide arm 3, even if a slight error occurs in the stroke of the piston, it will not affect the maintenance of the predetermined horizontal angle of the guide arm 3. There is no. Therefore, there is of course no need to provide something like a stopper, which is undesirable for a device using a reciprocating engine, as described in the prior art.

(Effects of the Invention) Since the present invention is constructed as described above, it has the effect of eliminating all the drawbacks of the prior art with a simple structure. That is, when clamping, the workpiece is first supported by the guide arm that is stopped by the roller guided by the roller contact surface of the clamp rod, and then the workpiece is clamped by the clamp arm connected to the clamp rod. On the other hand, when releasing the clamp, first move the clamp arm connected to the clamp rod to release the clamp, and then move the guide arm using the roller guided by the groove from the roller contact surface of the clamp rod. This improves the workability of clamping and unclamping.

Since the clamping device has a vertically elongated shape, it occupies less space in the factory, which is advantageous in terms of the arrangement of mechanical equipment.

Only one set of actuators is required, so
It is possible to reduce the causes of malfunction due to actuator failure, and it is also advantageous in terms of maintenance.

It is no longer necessary to provide the clamping device with a stopper that is harmful to the reciprocating engine.

[Brief explanation of the drawing]

Figure 1 is an overall view of a conventional clamp device, Figure 2 is a diagram showing the main structure of a conventional clamp device in which actuators are combined into one set, and Figure 3 is an embodiment of the present invention. Overall view of the clamping device,
FIGS. 4 and 5 are diagrams showing the operating state of the arm. 1... Main body, 2... Clamp arm, 3... Guide arm, 4... Actuator, 5... Piston rod, 6... Clamp rod, 6a...
Groove, 6b... Roller contact surface, 7... Connection member, 8
……roller.

Claims (1)

[Scope of utility model registration request] A clamp arm having a long hole at one end, a guide arm bent into an L shape and having a roller at one end, and a clamp rod having a flat roller contact surface and a groove continuously recessed in the roller contact surface. The clamp arm is positioned on the upper side and the guide arm is positioned on the lower side, and is pivoted on the main body with a predetermined distance apart, the roller contact surface moves parallel to a line connecting the centers of the pivot support, and the roller The clamp rod is attached to the main body so that the guide arm remains approximately horizontal while the roller is in contact with the contact surface, while the clamp arm is held approximately horizontally by the movement of the clamp rod while the roller is guided by the roller contact surface. A clamping device characterized in that an elongated hole is connected with a pin to a clamp rod so that the clamp arm rotates around a shaft support and opens and closes from clamping to unclamping, and when the clamp arm is unclamped, the roller is guided by the groove. .