JPH0214908Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a constant pressure clamp mounting device for workpieces having different length dimensions in a workpiece mounting device.

The mounting device for various types of workpieces in this type of pallet transfer type transfer machine needs to confirm the end of the workpiece mounting operation when starting the next operation for automatic operation. In order to meet this demand, a workpiece mounting device with a function that can automatically check the moving end of workpieces with different length dimensions without any change of setup was published in Utility Model Application Publication No. 57-91548. It is provided accordingly.

However, in the above device, the movable reference body is moved by a screw and a nut via a spring, and by changing the amount of deflection of the spring for workpieces of different lengths, the moving end of the screw is kept constant. Since the operating end of the moving reference body is detected at the moving end, the clamping pressure for workpieces (processed products) of different lengths is not constant, and the moving position of the moving reference body is not directly detected. , it is not possible to grasp the clamping status of the workpiece.

The present invention aims to provide a constant pressure clamp mounting device for a workpiece in a workpiece mounting device that eliminates the drawbacks of the conventional devices.

The key point of this invention is to grasp the clamping status of the movable reference body to the workpiece by directly detecting the relative movement position between the movable reference body (tombstone) and the screw, which are moved by the screw via the spring, with the sensor on the screw. In addition, the clamping pressure of workpieces with different length dimensions can be kept constant by controlling the amount of deflection of the spring.

Hereinafter, the configuration of the present invention will be explained with reference to an embodiment shown in the drawings. Constant pressure clamp mounting device for workpieces of the present invention 1
00 is placed on the pallet 2 on the conveyance line 1 so that it can be applied to transfer machines.
A power wrench device 200 for clamping is provided at a mounting station and a removing station for the workpiece W.

First, the apparatus 100 for mounting works on the pallet 2 will be explained. Reference numeral 3 denotes a mounting device main body fixed on the pallet, and a sliding surface 3a on the upper surface of which a moving reference body (tombstone) 5 having an L-shaped cross section is slidably placed.
and a side wall plate 3b at the rear end (right end in the figure) for attaching the reference bush 4 to the main body 3.
has been erected. The moving mechanism of the moving reference body 5 is controlled by forward and reverse driving of a screw 6, which is driven by a female screw 7a and a male screw 6a of a nut body 7 fitted into a horizontal hole 3d of the main body 3. are screwed together. The tip of this screw 6 is connected to the shaft hole 8 of a cylinder 8 fixed to the bottom surface of the movable reference body 5.
a, and a collar body 9 is fixed to the distal end surface thereof. 10 is a spring that connects the shaft hole 8a and the male screw 6 through the thrust bearing 11.
The movable reference body 5 is mounted between
is elastically moved to the reference bush 4 side. By controlling the compressive deflection amount of the spring 10, the clamping pressure is kept constant regardless of the length and width of the workpiece W (details will be described later). Further, when the screw 6 is reversed, the collar body 9 presses the side surface of the shaft hole 8a to move the movable reference body 5 away from the reference bush 4 as shown in FIG. The drive source of the screw 6 is the nut runner N ₁ of the clamp power wrench device 200.
The mounting device 10 of the power wrench device 200
0 to engage the dog clutch _C1 .

Next, the locking member 300 for clamping the movable reference body 5 in a predetermined position will be explained with reference to FIGS. This locking member 300 is provided in the main body 3 on both sides of the screw 6, and each rotating tube 11 is supported at the tip of the main body cylinder 3e via thrust bearings 13 and 14. A male screw rod 15 is screwed into the female screw 11a of the rotating tube, and a wedge plate 16 is attached to the rear end of the male screw rod 15.
are installed in succession. The wedge plate 16 has a head 18a engaged with the upper surface of the long groove 5a of the movable reference body 5, and a clamp shaft 18 floated by a spring 17.
The tapered holes 18b of the two are engaged with each other. Then, when the meshing clutch _C2 of the rotary cylinders 11 and 12 is driven in the forward direction by a nut runner (not shown), the wedge plate 16 moves to the left, causing the clamp shaft 18 to sink and clamp the moving reference body 5 to the main body 3. It is structured as follows.

Next, on the front surface of the mounting plate 5b of the movable reference body 5, there is a reference bush 5c for mounting the workpiece W.
Clamp claws 20 for clamping the flange portion of the workpiece W are provided at four locations on the outer periphery thereof, and are moved forward and backward as shown in FIGS. 1 and 3 by driving the male screw rod 21 forward and backward. A dog clutch _C3 is provided at the tip of the male threaded rod 21, and is connected to a nut runner _N2 . P, _P1 , _P2
are air intakes connected to the nozzle holes P', P ₁ ', P _{2 '} for checking the close contact between the workpiece W and the reference bushes ₄ , 5c; On the other hand, compressed air is supplied from an air supply rod 22 (one in the illustration) provided in the clamp power wrench device 200 by abutting and joining as shown in FIG. 1 when the device 200 moves forward. Each nut runner N ₁ of the power wrench device 200 for clamping,
N ₂ and the air supply rod 22 are protruded by a predetermined amount toward the mounting device 100 side by a spring 23, and the power wrench device 200 moves forward toward the mounting device 100 side and springs each member N ₁ , N ₂ , 22. 2
3, the engaging clutches C ₁ to C ₃ and the air intake port P ₁ ,
It comes into contact with _P2 when pressed. The member for detecting and setting the constant pressure clamp of the present invention is the tail end rod 22' of the air supply rod 22 that follows the moving position of the moving reference body 5.
A limit switch LS is provided on the bracket 24 on the nut runner _N1 , which is connected to a screw 6 that slides the movable reference body 5 through the deflection of the spring 10. When the deflection of the spring 10 that occurs when the workpiece is attached reaches a predetermined amount, the limit switch LS is activated. The limit switch LS controls the stopping of the drive motor (not shown) of the nut runner _N1 .

The structure of the constant pressure clamp mounting device 100 for a workpiece of the present invention and its related members are as described above, and their functions will be explained below. To clamp the workpiece W to the constant pressure clamp mounting device 100 on the pallet 2, which is positioned and clamped on the workpiece mounting station on the conveyance line 1, first, as shown in FIG. 1, a gap is created between the reference bushes 4 and 5c. Insert in state. After that, as shown in FIG.
0 side, each member N ₁ , N ₂ , 2 as shown in Figure 1.
2 is connected to each dog clutch C ₁ to C ₃ and air intake ports P ₁ and P ₂ with its protrusion pushed in a small amount.
At this time, the limit switch LS is at the position a shown in FIG. 6 with respect to the dog D located at the position b on the air supply rod 22. Here, when the screw 6 is propelled to the right by the forward rotation of the nut runner _N1 , the moving reference body 5 moves to the right via the spring 10, moves to an interval corresponding to the length of the workpiece W, and then stops. . Until this state, there is a limit switch.
The relative distance between LS and dog D is kept constant, both end surfaces of workpiece W are in close contact with reference bushes 4 and 5c, and this condition is confirmed with air. After this, the screw 6 strongly compresses and bends the spring 10 as the nut runner _N1 continues to rotate in the normal direction, and the limit switch LS, which moves together with the screw 6, aligns with the point c of the stopped dog D. When the nut runner N1 comes into contact with the nut runner _N1 , this switch LS is activated. The clamping pressure of the movable reference body 5 against the workpiece W is such that the spring 10 is further moved by a predetermined amount It is set by a constant elastic force generated by compressing and deflecting. The above clamping pressure does not affect the compressive deflection x of the spring 10 even if the length l of the workpiece W changes (variations in the position of point b of the limit switch due to changes in the weight of the workpiece can be ignored). Workpieces W having different length dimensions l can be clamped at a constant pressure.

As described above, when the constant pressure clamping of the workpiece W is completed, the locking member 300 and the clamp claw 20 are connected to the rotating cylinder ₁₁ by the nut runner N2.
The moving reference body 5 and the flange portion of the workpiece W are clamped by normal rotation of the male screw rod 21 (third,
(See Figure 5). When the above operations are completed, the clamping power wrench device 200 separates from the constant pressure clamp mounting device ₁₀₀ and stops as shown in _FIG . from the mounting device 100. The constant pressure clamp attachment device 100 is now transferred on the conveyance line 1 to each processing station by the movement of the pallet 2.

Next, the unclamping operation of the workpiece W will be explained. The clamping power wrench device 200 approaches the constant pressure clamp mounting device 100 located at the workpiece removal station (or the mounting station) in the same manner as described above, and each member N ₁ , N ₂ , 2
2 to each member C ₁ to C ₃ , P ₁ , and P ₂ . First of all,
A nut runner (not shown) of the locking member 300 drives the rotary cylinder 11 in the reverse direction to unclamp (release) the movable reference body 5 with respect to the main body 3. Following this, the nut runner N ₁ is driven in reverse, the screw 6 moves the movable reference body 5 to the left via the collar body 9, and the screw 6 moves a predetermined amount of movement to the nut runner N ₁ or the tail end dog of the air supply rod 22. D ₁ is the limit switch
Activate, detect and stop LS ₁ . Thereafter, the nut runner N ₂ is driven in reverse, the clamp claw 20 releases the flange of the workpiece W as shown in FIG.
Move backward to the 0 side and end. With the above steps, the unclamping operation is completed, and the workpiece W is
Remove and replace.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and the design can be changed within the gist of the invention. For example, the dog D may be installed on the movable reference body 5, and the limit switch LS corresponding thereto may be installed at a position facing the dog D on the nut runner _N1 .
Furthermore, although the dog D for detecting the position of the moving reference body 5 is installed on the air supply rod 22, a detection rod may be provided separately and the dog may be provided on this rod. Furthermore, as shown in FIG. 7, a switch _LS0 for detecting the dog D provided on the movable reference body 5 is provided on the screw 6 so as to move integrally with this screw,
Of course, the configuration may be such that when the switch member LS ₀ is activated, this activation signal is detected by a separate sensor S. Further, the mounting device 100 may not only be placed on a pallet on a conveyance line, but may also be of a fixed stationary type.

As mentioned above, according to the constant pressure clamp mounting device for workpieces of the present invention, the clamping pressure for workpieces with different length dimensions, which has been a problem with conventional workpiece mounting devices (particularly, Utility Model Application No. 57-91548), can be improved. Problems such as not being able to grasp the clamping status of the workpiece due to not being constant or not directly detecting the moving position of the moving reference body have been resolved, and it has become possible to grasp the clamping status of the moving reference body to the workpiece. This has the excellent effect of making the clamping pressure constant by controlling the amount of spring deflection regardless of the length of the workpiece.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a constant pressure clamp mounting device for a workpiece of the present invention and a power wrench for clamping it, Fig. 2 is a left end view of the constant pressure clamp mounting device of the present invention, Figs. 3 and 4 are operational sectional views, FIG. 5 is a cross-sectional view of the locking member showing a state in which the moving reference body is locked to the main body of the device, FIG. 6 is a schematic diagram showing the relationship between the limit switch and the dog, and FIG. 7 is a schematic diagram of a modified embodiment. . 1... Conveyance line, 2... Pallet, 3... Mounting device main body, 3b... Side wall plate, 4, 5c... Reference bush, 5... Moving reference body, 6... Screw, 10... Spring, W ...Work, C ₁ ~
C ₃ ... meshing clutch, N ₁ , N ₂ ... nut runner, 22 ... air supply rod, D ... dog, LS ...
...Limit switch, 23... Spring, 1
00... Workpiece constant pressure clamp mounting device, 200
... Power wrench device for clamp, x ... Deflection amount of spring, l ... Length dimension of workpiece.

Claims (1)

[Scope of utility model registration request] The mounting device has a reference bush fixed on the main body and a movable reference body that is moved by a screw, and the screw is rotated using the nut runner of the power wrench device as a driving source to apply compressive pressing force to the spring, and this pressing force is In a workpiece mounting device that clamps workpieces with different length dimensions between a moving reference body and a reference bush through a locking member, the moving reference body and the workpiece are fixed by a locking member. Place a dot on the member,
A limit switch is provided on the screw or a member that moves related thereto, and when the screw is rotated using a nut runner of a power wrench device as a rotational drive source and a predetermined amount of deflection occurs in the spring, a limit switch is activated on the dot and the screw is rotated. 1. A constant pressure clamp mounting device for a workpiece, characterized in that a detection member is installed to detect when the rotational drive of the spring is stopped and the clamping pressure becomes constant by a predetermined amount of deflection of the spring.