JPH0217795Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a positioning device for a workpiece attached to a pallet.

<Prior Art> In a workpiece processing line, a pallet with workpieces attached thereto is moved to a processing station for processing. The workpieces to be mounted on the pallet are positioned in a distributed manner using the outer diameter of the workpiece as a reference by moving a pair of positioning blocks provided on the pallet that form a pair of opposing V-shaped reference surfaces forward and backward in synchronization. There is. In the conventional apparatus, a synchronizing mechanism for moving a pair of positioning blocks in synchronization was provided within the pallet.

<Problems to be solved by the invention> When positioning a workpiece using a pair of positioning blocks as described above, a synchronization mechanism for moving both positioning blocks forward and backward in synchronization is provided in each of a large number of pallets. As a result, the pallet structure becomes complicated, the pallet becomes thicker, and when machining is performed by inserting the tool from the opposite side of the mounting surface of the workpiece, the tool becomes longer and run-out is more likely to occur. There is a problem that the weight of the pallet itself increases.

In the present invention, the pallet is provided with a positioning block, which is the minimum component configuration necessary for positioning the workpiece, and a means for moving the positioning block forward and backward in the same amount. is installed separately to solve the above-mentioned conventional problems.

<Means for Solving the Problems> The present invention includes a pair of positioning blocks arranged on a pallet facing each other so as to be movable in forward and backward directions and sandwiching a workpiece; An input shaft that moves each of the positioning blocks forward and backward by the same amount by connecting them through means for converting rotational motion into movement in the forward and backward directions of the positioning blocks and transmitting the same; and a workpiece that is held and positioned by the positioning blocks. A clamper for clamping the pallet is provided, a movable head that can move forward and backward with respect to the pallet is arranged, and the movable head has a
A drive shaft that can be connected and separated by engaging the input shaft in the rotational direction, and a synchronous rotation drive device for this drive shaft are provided.

<Function> The present invention moves the movable head forward with respect to an empty pallet transported to the workpiece mounting station by a transfer device, etc., connects the drive shaft and input shaft, and synchronizes the drive shafts. The workpiece is positioned by rotating and moving the positioning block forward by the same amount, and the clamper is tightened by a nut runner or the like to clamp the positioned workpiece.

<Examples> Examples of the present invention will be described below based on the drawings. In FIGS. 1 and 2, 1 is a palette. In the illustrated example, a pair of positioning blocks 2a and 2b (three pairs in the illustrated example) are arranged on the upper and lower sides of one vertical side of the pallet 1, facing each other through positioning shafts 3a and 3b so as to be movable forward and backward. . The respective positioning blocks 2a and 2b include
Input shafts 4a and 4b are linked via means for converting rotational motion into motion in the forward and backward directions of positioning blocks 2a and 2b and transmitting the same. This input shaft 4a,
4b projects on the opposite side to the surface on which the positioning blocks 2a and 2b are arranged. The configuration of the motion conversion transmission means includes movable bodies 6a, 6b that are movable in an axial direction perpendicular to the axes of the positioning shafts 3a, 3b, and the movable bodies 6a, 6b and the positioning shafts 3a, 3.
b are engaged with the inclined engagement surfaces 9a, 9b inclined with respect to the axes of the movable bodies 6a, 6b, and the movable bodies 6a, 6
Rack teeth 8a, 8b are provided on input shafts 4a, 4.
b is provided with pinions 7a and 7b that mesh with the rack teeth 8a and 8b.

Furthermore, interlocking shafts 5a and 5b passing through the axes of the movable bodies 6a and 6b are provided, and flanges 10a and 10b are formed on the interlocking shafts 5a and 5b, so that the flanges 10a and 10b and the side end surfaces of the movable bodies 6a and 6b are connected to each other. spring 11 between
a, 11b, and interlocking shafts 5a, 5b.
At one end, springs 12a and 12b are installed which push the movable bodies 6a and 6b via the flanges 10a and 10b and springs 11a and 11b, and urge the positioning blocks 2a and 2b in the forward direction. There is.

Furthermore, the positioning block 2 of the pallet 1
A guide member 13 for the workpiece W to be held between the positioning blocks 2a and 2b and a clamper 14 are provided on one side of the side where the positioning blocks 2a and 2b are arranged. A tool insertion hole 28 is opened for inserting the tool from the other side of the workpiece W to process the workpiece W.

In FIG. 1, reference numeral 15 denotes a transfer device for conveying the pallet 1, and is composed of a transfer bar 16, a guide rail 17, a positioning rail 18, and the like. This transfer device 1
A movable head 19 that can move forward and backward with respect to the other side of the pallet 1 is arranged at the workpiece mounting station of the pallet 1 conveyed by the pallet 1.
This movable head 19 has drive shafts 20a, 20b which can be connected and separated by engaging input shafts 4a, 4b on the pallet 1 side in the rotational direction, and support cylinders 29a, 29b.
These drive shafts 20a, 20 are rotatably supported by
A drive device is provided to rotate the motors b synchronously.

The input shafts 4a, 4b and the drive shafts 20a, 20b
As shown in FIGS. 1 and 3, the ends of the drive shafts 20a and 20b are connected to the input shaft 4.
A, 4b are fitted into a cylindrical shaft, and axial keys 21a, 21b are fixed to the inner surface of this cylindrical shaft.
It has a structure in which key grooves that engage with the keys 21a and 21b are provided on the a and 4b sides.

The movable head 19 is also provided with a nut runner 26 for tightening and loosening the clamper 14. That is, the rotating shaft 14a of the clamper 14 projects toward the movable head 19 along an axis parallel to the input shafts 4a and 4b, the engaging alloy 14b is provided at the end of the rotating shaft 14a, and the engaging alloy 14b is provided at the end of the output shaft of the nut runner 26. A driving metal 27 is provided which engages and disengages from the drive member. Incidentally, the clamper 14 can also be operated from one side of the pallet 1 using a hand-held tool such as a nut runner.

Further, the synchronous rotation drive device for the drive shafts 20a, 20b is as shown in FIG.
Pinions 25a and 25b are provided at the rear end of 0b,
The drive shaft 2 is connected to a rack shaft 22 provided with rack teeth 24a and 24b that mesh with the pinions 25a and 25b.
It is supported by a support block 30 so as to be movable in a direction perpendicular to the axes of the rack shafts 22, and a positioning cylinder 23 is connected to one end of the rack shaft 22.

Next, the operation of the present invention will be explained. The movable head 19 moves forward with respect to the empty pallet 1 that has been transferred to the workpiece mounting station by the transfer device 15 and positioned by the positioning rail 18, and connects the drive shafts 20a, 20b and the input shafts 4a, 4b. The nut runner 26 and the rotating shaft 14a of the clamper 14 are connected to each other. Then, the workpiece W is supported by the guide member 13 by the operator, and the drive shafts 20a and 20b are rotated synchronously.
As a result, the input shafts 4a, 4b rotate, the movable bodies 6a, 6b are moved in the axial direction by the pinions 7a, 7b, and the positioning blocks 2a, 2b are moved forward by the same amount by the inclined engagement surfaces 9a, 9b. , workpiece W
is held and positioned by positioning blocks 2a and 2b. After positioning the workpiece W, the clamper 14
Pass it over the workpiece W and touch it, then turn the nut runner 2.
6 to rotate the rotating shaft 14a in the tightening direction and clamp the workpiece W to the pallet 1. Thereafter, the movable head 19 moves forward and backward, and the drive shaft 20
a, 20b and the input shafts 4a, 4b as well as the nut runner 26 and the rotating shaft 14a of the clamper 14 are separated, and the pallet 1 is transported by the transfer device 15 to the processing station.

Note that after the workpiece W is held by the clamper 14, the springs 11a and 11b on the interlocking shafts 5a and 5b move the movable body 6 with their elastic force.
The movement of parts a and 6b is restrained to prevent displacement of the workpiece W and generation of vibration.

When removing the workpiece W from the pallet 1 after completing machining of the workpiece W, the clamper 14 is unclamped, and one interlocking shaft 5a is moved in the direction of arrow A in FIG. 2, and the other interlocking shaft 5b is moved in the direction of arrow B. By moving the axis in the direction of the arrow, the collars 10a, 10
b is in contact with the movable bodies 6a and 6b, and in FIG.
b moves to the right and positions the positioning blocks 2a and 2b.
is moved backward, and the clamping of the workpiece W is released.

<Effects of the invention> As described above, according to the invention, a positioning block is provided on the pallet side that can move forward and backward to sandwich the end faces of the workpiece and position the workpiece in a distributed manner with both ends of the workpiece as a reference. It is equipped with an input shaft for moving the blocks forward and backward, and separately from the pallet, a movable head equipped with a drive shaft that engages and disengages from the input shaft and a synchronous rotation drive device for this drive shaft is provided so as to be able to move forward and backward with respect to the pallet. Because it is a thing,
The structure of the pallet is simplified, the thickness of the pallet can be reduced, and not only is the pallet itself lighter, but it is also possible to use shorter tools when inserting tools from the opposite side of the pallet surface on which the workpiece is attached. This enables machining with no tool runout, improving machining accuracy and tool life.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of the present invention, FIG. 2 is a partially sectional front view, and FIG. 3 is a sectional view taken along the line of FIG. 1. 1... Pallet, 2a, 2b... Positioning block, 4a, 4b... Input shaft, 6a, 6b... Movable body, 7a, 7b... Pinion, 8a, 8b...
Rack teeth, 9a, 9b... inclined engagement surface, 19...
Movable head, 20a, 20b... Drive shaft, 21
a, 21b...Key, 22...Rack shaft, 23...
...Positioning cylinder, 24a, 24b...Rack teeth, 25a, 25b...Pinion.

Claims (1)

[Scope of utility model registration request] A pair of positioning blocks are placed on the pallet facing each other so that they can move forward and backward, and hold the workpiece between them. An input shaft is connected through a transmission means to move the respective positioning blocks forward and backward by the same amount, and a clamper is provided for clamping the workpiece that has been clamped and positioned by the positioning block, and the input shaft is connected through a transmission means to move the positioning blocks forward and backward with respect to the pallet. A workpiece positioning device comprising: a movable head, which is provided with a drive shaft that engages the input shaft in the rotational direction and can be connected and separated; and a synchronous rotation drive device for the drive shaft. .