JPS61236465A - Pallet positioning device - Google Patents

Abstract

PURPOSE:To make accurate and easy positioning possible by holding plural cylindrical positioning pins arranged on the lower surface of a pallet body between the V shaped abutting planes of a pair of fixing elements, and correcting the above pins simultaneously before and behind, and right and left to position them. CONSTITUTION:When a detecting means detects the arrival of a pallet body 1, an air cylinder 33 rotates a cam shaft 17 counterclockwise, and height positioning pins 6 decide the height of the pallet. A stationary arm cam 18 for vertical movement turns into a concave lead, and fixing elements 3, 4 are therefore raised by springs 12 to sit opposite to pallet cylindrical positioning pins 2. When the shaft 17 rotates further, a pressing cam 20 for the fixing element presses a roller 19 to rotate a supporting rod 8 counterclockwise, and thereby the V shaped opposite abutting planes 5 of the fixing elements, 3, 4 hold a pin group 2 between them to make their positioning. Thus the position of the pallet can be corrected and decided simultaneously before and behind, right and left without obstruction due to chips by means of a few parts.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a positioning device for a pallet for transporting articles used in a trans-edge machine that performs cutting, assembly, etc.

(Prior Art) In a transfer machine that transports an article by attaching it to a predetermined position on a pallet, the pallet is once released from a conveyance tool at a processing station, and then the pallet is positioned by a pallet positioning mechanism provided at the station. For this positioning, there are usually two directions: front and back and left and right of the pallet.

Positioning is performed in the vertical direction by separate mechanisms.

For example, in Japanese Patent Publication No. 55-11460, by fixing the pins on the pallet side in the front and rear direction,
By fixing the left and right sides by sandwiching the pallet sides,
The respective positions are determined in the vertical direction by supporting pins protruding from the bottom surface of the pallet.

(Problems to be Solved by the Invention) In this type of pallet positioning device, in order to accurately determine the position in each direction, the accuracy of the side walls of the pallet, the pins, etc., and the accuracy of the positioning part on the stage 1 side, etc. are required. There are many places that require precision.

It is especially difficult to maintain accuracy (low variation) between groups of pallets and stations.

It was extremely difficult to maintain accuracy during expansion and capture.

(Means for Solving the Problems) In the present invention, as shown in FIGS. 1A to 1C, a plurality of positioning pins 2, 2 having a cylindrical cross section are protruded from the lower surface of the pallet body 1 at appropriate intervals. .

Connect this group of pins to a pair of fixtures 3゜4 on the station side.
They are arranged symmetrically with each other or are positioned and fixed by being sandwiched between the molded contact surfaces 5, 5. One fixture 3 is designed to stop at a fixed position.

(Function) When the fixtures 3 and 4 on the stage and side move in the direction of arrow A and sandwich the bottle groups 2 and 2, due to the relationship between the cylindrical surface 9 and the surface 7,
Each bottle 2, 2 moves to the most stable position within the V-shape 5° 5 and stops there.

That is, even if the pallet main body 1 deviates from a predetermined position, the pallet main body 1 is positioned at the predetermined position by correcting its inclination in the front, rear, left, and right directions, as well as in the plane.

One side 3 of the fixture is in operation to pinch the bottle group 2.2.

Either it doesn't move, or it moves a little and then stops in place.

(Embodiment) FIGS. 2 to 5 show an embodiment of the present invention. In FIG. 2, numerals 1 to 5 correspond to the respective symbols in FIG. 1. That is, 1 cylindrical positioning bin 2, 2
are fixed through the pallet body 1 at appropriate intervals, and protrude upward and downward. The two upper protrusions serve as article setting jigs for setting articles (not shown) on the pallet main body l in a predetermined position, and the lower protruding portion 2B serves as an article setting jig for setting articles (not shown) on the pallet main body l in a predetermined position. They are pressed into contact with a pair of fixtures 3.4 provided at a pallet stopping station (not shown), respectively. 6 is a bin for positioning the pallet in the height direction, near the four corners of the pallet body,
It is protruded from the bottom.

Reference numerals 7 and 8 indicate support rods for fixing the fixtures 3 and 4 at their upper ends, respectively, and as shown in FIG. The other second support rod 8 is vertically slidable and has a spherical metal 11 on the frame 1o via a two-spherical metal 11 so that the frame 10 can be vertically slidable and there is no wobbling in the lateral direction. They are each held in a slightly angularly variable range of rotation around the center.

The support door 8 is urged upward by springs 12 and 12, while a rotation stopper plate 13 is provided at the bottom.
．． ．． 13 is fixed, and its both sides are slidably contacted with rotation prevention guides 1414 fixed to the frame 10 without rattling, thereby preventing rotation of the support rod 7.8 about the axis. Further, a cam follower 15.15 is attached to the rotation stopper plate 13.13, and this cam follower 15.15 is attached to a bowl cam 18 for vertical movement of a fixture fixed to a cam shaft 17 of a cam device 16 provided on the frame 10. The fixing members 3 and 4 are pressed down against the spring force of the springs 12 and 12 by coming into contact with the cam surface.

Further, a roller 19 is rotatably fitted into the second support rod 8, and this roller 19 approaches and separates from the cam surface of the fixture pressing cam 20 which is rotatably fitted into the camshaft 17. It looks like this.

As shown in FIG. 4, the force ram 20 has an arcuate groove 21 concentric with the camshaft 17, into which the pin 22 implanted in the bowl cam 1% is inserted. arc 92
A spring 23 is elastically loaded between one end of the cam 2o, and the cam 2o is biased counterclockwise in FIG.

The pallet body 1 also has a structure as shown in FIG.

Pallet traveling rollers 24 are provided on the sides near the four corners, and these rollers 24 are placed on guide rails to convey the valent. A description of the guide rail and pallet transport drive system will be omitted as they are not directly related to this invention, but at the pallet stopping station, the guide rail is separated from other parts and is connected to the station section guide rails 25, 25. Thus, it is fixed to the guide rail support rods 26 and 27. These guide rail support openings and doors 26 and 27 are both inserted into and held in the frame 10 so as to be vertically movable. First guide rail support rod 2
Two guide rail support rods 6 are provided for each guide rail with the second guide rail support rod 27 interposed therebetween, and the first guide rail support rod 26 has a spring tensioned between the first guide rail support rod 26 and the frame 10 at its lower part. 28. The second guide rail support rods 27, 27 are urged downward by 28.
A guide rail vertical arm cam 30 attached to the cam shaft 7 acts on the lower end of the cam shaft 7 via levers 29 and 29.

3] is a pallet support seat that is fixed to the frame 10 and comes into contact with the height direction positioning pin 6.6 when the pallet is fixed;
2. Flow from dust and dirt during product processing 24. Guide rail 25. This is a cover that protects the pallet support seat 31 and the like, and is attached to the frame 10.

The above-mentioned cam device 16 is driven by the air cylinder 33 (second
(see Fig. 3). That is, the roller 35 at the tip of the rod 34 of the cylinder 33 engages with the groove 37 of the driven lever 36 fixed to the camshaft 17, and the air cylinder 3
3 swings the operating camshaft 17.

In the above configuration, the pallet positioning operation will be described next.

The pallet conveyed on the guide rail to the pallet stopping station is released from the pallet conveying drive system by two pallet stopping means (not shown), and is stopped at the position shown in FIG. When a pallet arrival detection means (also not shown) provided at the station detects this, the air cylinder 33 is operated to rotate the camshaft 17 counterclockwise in FIG. 2. As a result, the recessed lead portion 30α of the guide rail up and down arm cam 30 releases the lever 29.29, and the station guide rail 25 is lowered by the spring 28 to the position shown in FIG. 5, and the four heights of the pallet are lowered. The horizontal positioning pin 6 is the pallet support seat 31 of the station.
The height of the L/throat is determined by placing each on the . At approximately the same timing as this operation, the arm cam 18 for vertical movement of the fixing device is also recessed and its lead is raised to face the cylindrical positioning pins 2, 2 of the pallet that have been lowered, as shown by the imaginary line in FIG. Moreover, the roller 19 on the second support rod 8 faces the fixture pressing cam 20. As the cam shaft 17 rotates, the fixture pressing cam 20 pushes the roller 19, and the second support rod 8 rotates counterclockwise in FIG. 9
The cylindrical positioning pins 2.2 are pushed and the pin groups 2, 2 are held in place by the opposing V-shaped contact surfaces 5, 5 of the fixtures 3, 4, thereby positioning the pallet on a plane.

Fixation takes place. At this time, the excessive pressing force of the fixture pressing cam 20 is absorbed by the spring 23.

On the pallet that has been accurately and firmly positioned and fixed in this manner, operations such as cutting and assembly are performed on the articles that have been positioned using the article setting jigs 2A, 2A. Since the article setting jigs 2A, 2A are integrally formed with the cylindrical positioning pin 2.2, as long as the article setting jig 2A is positioned accurately, the positional relationship with the pallet body requires precision. This makes it easier to manufacture pallets. When attaching the article setting jig separately to achieve positional accuracy like other structures, the final positional accuracy of the article will be affected by both the pallet positioning error and the article positioning error on the pallet.
In this embodiment, this does not occur and the positioning accuracy of the article is improved.

When the work on the pallet is completed, air cylinder 3 is activated.
3 returns to its original position, and at the same time, the camshaft 17 also rotates in the opposite direction, and the pallet is released from the fixture, placed on the guide rail 25 again, ascends to its original position, and is transported to the primary station. To go.

In the above embodiment, the positioning bins facing different V-shaped contact surfaces can be spaced apart as much as possible to obtain higher positioning accuracy. , similar to other fixtures 4,
It may also be movable in the lateral direction and may hit a stopper at a predetermined position. The V-shaped exit surface has a symmetrical arrangement.

Depending on the design specifications of the pallets and stations, they may be arranged as shown in FIGS. 1B and 1C, for example.

The positioning bin has a cylindrical shape as well as a tapered shape, and its fixed position can be adjusted by taking it in and out. It may be modified such that it can be pressed firmly against the pallet support seat by using a reverse taper.

(Effect) According to the present invention, a plurality of positioning bins having a cylindrical cross section arranged at appropriate intervals on the lower surface of the pallet main body are sandwiched between the respective V-shaped contact surfaces of a pair of fixtures, and Since the direction is corrected and positioned at the same time, it is not affected by dust such as chips, and precise positioning can be performed with a small number of parts and a small number of precision points. The manufacture of the pallet is also easy because the cylindrical part, which is easy to achieve accuracy, becomes the ink for achieving accuracy, and it is possible to obtain a uniform pallet with little variation. Especially the capture of pallets.

It has the effect of greatly improving the flexibility and ease of use of pallet equipment such as transfer machines, such as easy expansion and easy creation of pallets in response to changes in target goods.

[Brief explanation of drawings]

Figures J A, B and C are schematic diagrams showing the principle of the invention, Figures 2 to 5 show an embodiment of the invention;
The figure is a perspective view showing the main mechanism, FIG. 3 is a sectional view showing the mechanism for positioning the pallet in the front, back, left and right directions, FIG. 4 is a partially enlarged plan view of the cam device, and FIG. 5 is a top and bottom view of the pallet. It is a sectional view showing a direction positioning mechanism. 1...Pallet body 2...
・・・・・・・・・・・・Cylindrical cross-section positioning bin 2
A...... Article setting jig 3.4...
・・・Fixing fixture 5・・・・・・・・・・・・・・・V-shaped exit surface Applicant
Nemoto Engineering Ltd. Diagram 3

Claims (2)

[Claims] (1) A plurality of protruding positioning pins with a cylindrical cross section arranged at appropriate intervals on the lower surface of the pallet main body on which articles are placed, and a pallet stopping station, at least one of which is movable toward the other and the other is fixed. a pair of fixing devices having symmetrically arranged or shaped abutment surfaces that stop at a position, each of the V-shaped abutment surfaces being connected to a different locating pin of the plurality of locating pins having a cylindrical cross-section; A pallet positioning device characterized by being pressed against the pallet. (2) The pallet positioning device according to claim 1, wherein at least one of the cylindrical positioning pins projects through the upper surface of the pallet body to form an article setting jig.