JPH0224588Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a pallet clamp device used in processing machines and the like.

<Prior art> As a type of processing machine such as a machine tool, a large number of cylinders are arranged regularly in the vertical axis direction on the top surface of a table that is attached to the processing head of the processing machine so that it can move forward and backward. A support roller is provided on the upper surface of the piston, which is fitted into the piston so that it can move up and down while being prevented from rotating, and is rotatably supported via a roller supporter around an axis that is perpendicular to the direction in which the pallets are carried in and out; It is provided with an engaging protrusion that moves up and down integrally with the piston and engages with the pallet, and when the piston moves downward, the engaging protrusion clamps the pallet to a number of receiving members protruding from the table. For example, pallet clamping equipment was developed in the 1980s.
Published in issue 29438.

<Problems to be solved by the invention> In the above-mentioned conventional apparatus, the roller support is used as a means for correcting the pallet position when positioning the pallet on the table after being carried in, in order to float the support roller in the roller axis direction. The body is disposed within the piston so that the body itself can be moved relative to the piston. Therefore, it is not possible to provide a guide for sufficiently guiding the roller support, and the roller support tends to fall down, making it difficult to float smoothly.

<Means for Solving the Problems> The present invention has been made to deal with the above-mentioned conventional problems, and its gist is that a large number of cylinders are arranged in the vertical axis direction on the top surface of a table on which pallets are placed. A piston is installed in the cylinder and is rotatably supported on the upper surface of the piston, which is fitted into the cylinder so as to be movable up and down while being prevented from rotating, through a roller support. a support roller is provided, which moves up and down integrally with the piston,
In the pallet clamping device equipped with an engaging protrusion that engages with the pallet, the roller support body is fixed to the upper surface of the piston, and both ends of the roller support shaft are attached to the roller support body through a bearing bush in the axial direction. The support roller is rotatably supported on the roller support shaft.

<Operation> In the present invention, when correcting the position of the pallet supported on the support roller, the roller support shaft floats using the bearing bush as a guide.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. FIG. 1 shows a processing machine equipped with a pallet clamping device according to the present invention. In this processing machine, a bed 11 is inserted into a gate-shaped machining center 12 and arranged in the front-back direction thereof, and a rectangular table 13 is assembled to the bed 11. Table 13 is bed 11
It is attached to the top so that it can move in the front and rear directions, and can move forward and backward relative to the machining head 12a attached to the machining center 12. Further, a pair of pallets 14 are arranged on both the left and right sides of the table 13 in the retracted position, and each pallet 1
4 is a table 13 by a loading/unloading device (not shown).
They are carried upwards alternately. The pallet 14 carried onto the table 13 is moved to a positioning device 20, which will be described later.
After being positioned by the multiple clamping mechanisms 30
The table 13 is then clamped and moved forward together with the table 13. As a result, a workpiece (not shown) placed on the pallet 14 is processed by the processing head 12a. 37 is a receiving member for the pallet 14.

As shown in FIG. 2, the positioning device 20 includes a piston 22 that is fitted into an inner hole 21a of a cylinder 21 provided on the table 13 in a fluid-tight manner and slidable in the vertical direction, and a piston 22 that is integrated with the piston 22. The positioning pin 23 is formed in the upper end opening 21b of the cylinder 21 in a fluid-tight and slidable manner, protrudes upward by a predetermined length, and engages in the positioning recess 46 of the pallet 14. In such a positioning device 20, both upper and lower oil chambers R of the cylinder 21
Hydraulic pressure supply and discharge pipes of a hydraulic pressure supply mechanism (not shown) are connected to 1 and R2, respectively, and both oil chambers R1 and R2
By selectively supplying and discharging pressure oil to the piston 22
A positioning pin 23 integrated with the holder moves forward and backward in the vertical direction.

A large number of pallet clamp devices 30 according to the present invention are regularly arranged on the table 13. As shown in FIGS. 2 and 3, the concrete structure is as shown in FIG. It is inserted so that it can be moved up and down. This piston 3
A roller support body 35 is fixed to the upper surface of the roller support body 35, and a roller support shaft 38 is attached to the roller support body 35 in an axial direction perpendicular to the loading/unloading direction of the pallets 14, and in the axial direction via a bearing bush 39. It is pivotably mounted. A spring 40 is interposed between both end surfaces of the roller support shaft 38 and a spring presser 41 fixed to the roller support body 35, and always biases the roller support shaft 38 to the center position.

The support roller 36 is rotatably supported approximately at the center of the roller support shaft 38 via a radial bearing 47 .

Furthermore, on both sides of the support roller 36,
An engaging protrusion 42 that engages from the upper surface with a locking body 43 fixedly provided on the lower surface of the pallet 14 connects to the roller support 35.
It is more protruding. In FIG. 2, reference numeral 34 denotes a guide roller that faces and abuts against the locking body 43, and is located on the upper surface of the table 13 close to the cylinder 31. Also, in Figure 3, 44
is a roller abutting plate on which the support roller 36 abuts, and is fixed to the lower surface of the pallet 14.

In the processing machine constructed in this manner, as shown in FIG. 1, when the table 13 is in the retracted position of the bed 11, a pallet 14 is carried onto the top thereof by an unillustrated carry-in/out device. Further, the pallet 14 carried onto the table 13 is positioned by a positioning device 20 and clamped by a number of clamp devices 30.

However, when the pallet 14 is brought in,
While the positioning pin 23 of the positioning device 20 is moving downward, the piston 3 of the clamping device 30
2 moves upward, and the support roller 36 is in the upward position. Therefore, the pallet 14 carried onto the table 13 is supported by the support roller 36 in contact with the roller contact plate 44 and the guide roller 34 in contact with the locking portion 43.
The table 13 is guided in a direction perpendicular to the direction of movement of the table 13 and stopped at approximately a predetermined position. In this state, the positioning pin 23 is attached to the pallet 1.
The positioning recess 46 provided on the lower surface of the holder 4 is substantially opposed to the positioning recess 46 provided on the lower surface of the holder 4. During this time, the support roller 36 rotates in the direction in which the pallet 14 is carried in, and the force required to carry the pallet 14 is reduced.

Next, the pallet 14 is positioned by engaging it in the positioning recess 46 of the pallet 14 by the upward movement of the positioning pin 23. At this time, the pallet 14 is attached to the positioning pin 2.
3, the position of the pallet 14 is corrected for deviations in the transport direction and the table 13 in the forward and backward directions. In this position correction of the pallet 14, the movement of the pallet 14 in the carry-in direction is made light by the rotating action of the support roller 36, and the movement of the pallet 14 in the axial direction of the support roller 36, that is, in the forward/backward direction of the table 13, is , by floating the roller support shaft 38 in the axial direction with respect to the roller support body 35 using the bearing bush 39 as a guide.

After correcting the position of the pallet 14, the piston 32
moves downward to clamp the pallet 14. When the piston 32 is moved downward, the engaging protrusion 42 formed on the roller support 35 engages with the upper surface of the locking body 43 on the pallet 14 side and draws it toward the upper surface of the table 13. As a result, the pallet 14 is reliably clamped by the multiple receiving members 37 provided on the upper surface of the table 13. In this pallet clamped state, the support roller 36 is separated from the roller contact plate 44 on the lower surface of the pallet 14, and the roller support shaft 38 is returned to the central position by the spring 40.

<Effects of the invention> As described above, according to the invention, the roller support is fixed to the upper surface of the piston, and both ends of the roller support shaft are supported on the roller support so that they can float in the axial direction via bearing bushes. Since the pallet support roller is rotatably supported on the roller support shaft, the movement of the support roller in the axial direction during position correction during pallet positioning is carried out by the roller support shaft using the bearing bush as a guide. Since the roller support body is tilted, the roller support body does not fall down, and the shaft movement can be guided stably and smoothly. In addition, the structure is simple and has the effect of reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a processing machine equipped with the device of the present invention, FIG. 2 is an enlarged sectional view taken along the line of FIG. 1, and FIG. 3 is an enlarged sectional view taken along the line of FIG. 13...Table, 14...Palette, 20...
...Positioning device, 30...Clamping device, 31...
... Cylinder, 32 ... Piston, 35 ... Roller support body, 36 ... Support roller, 38 ... Roller support shaft, 39 ... Bearing bush, 40 ... Spring, 42 ... Engagement projection, 43 ... Engagement Stop body.

Claims (1)

[Scope of utility model registration request] A large number of cylinders are arranged in the vertical axis direction on the upper surface of the table on which the pallets are placed, and the pistons are inserted into the cylinders so as to be movable up and down while being prevented from rotating. A pallet clamping device including a supporting roller rotatably supported around an axis perpendicular to the loading/unloading direction, and having an engaging protrusion that moves up and down integrally with the piston and engages with the pallet. In,
The roller support body is fixed to the upper surface of the piston, and both ends of the roller support shaft are supported on the roller support body so as to be able to float in the axial direction via bearing bushes, and the support roller is rotatable on the roller support shaft. A pallet clamp device characterized by supporting.