JP2680887B2 - Positioning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention moves the same workpiece in the same machining station to two different positions in the transport direction, and uses two sets of locate pins provided corresponding to the respective positions. The workpieces are respectively related to the above two positions.

[Prior Art] Conventionally, a processing method has been performed in which a workpiece is moved to two different positions within the same processing station and the same processing is performed at two positions on the same workpiece.

For this purpose, a set of locate pins inserted into the reference holes of the work at the first processing position and another set of locate pins inserted into the reference holes of the work at the second processing position are provided. It is necessary to position each position by selectively driving them forward and backward. Conventionally, the locate pin is connected to each drive shaft for each set, and the two sets of locate pins are respectively driven by different driving means. I was driving.

[Problems to be Solved by the Invention] However, such a conventional structure requires at least two drive shafts for the locate pin and two drive means, which makes the structure complicated and expensive. Not only that, it requires a lot of mounting space within the narrow station space, and there is a problem such as interference with the machining head and the clamp device. Furthermore, the locate and unlocate operations between the two have no mechanical coupling with each other, and there is a risk of malfunction due to a shift in operation timing.

Therefore, the present invention aims to solve the above-mentioned problems, and connects two sets of locate pins corresponding to two machining positions of a work to one common rotary shaft with different phases, respectively. By indexing the moving shaft into three positions by one driving means, each positioning operation is surely performed and they are mechanically related to each other to prevent malfunction.

[Means for Solving Problems] In order to achieve the above-mentioned object, the present invention provides a work with a first structure.
At least two sets of locate pins, a locate pin for positioning at a position and a locate pin for positioning at a second position, are supported on at least each set of saddles, and a plurality of swing arms corresponding to the saddles are provided on a single rotary shaft. Fixed,
The saddles are connected to the swing arms via engaging means, and the rotary shafts are indexed into three indexing positions by one indexing drive means. In the first indexing position, only one set of locating pins is advanced, in the second indexing position both locating pins are held in the retracted position, and in the third indexing position the other locating pin is held. Only the pair of locate pins are moved forward so that the three operations of positioning the first position, canceling the positioning, and positioning the second position are performed while mechanically restraining each other, and a reliable positioning operation can be performed with a simple configuration. It was done like this.

EXAMPLES Specific examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing one processing station provided with the positioning device 1 of the present invention, in which the work transfer direction is viewed as a direction perpendicular to the paper surface.

Reference numeral 2 denotes a transfer bar, which is driven by a lift-and-carry method by a well-known drive device (not shown), and the work W is hooked by the transfer claws 2a by rising and moving forward, and the work W is slid along the guide rails 3 for the next processing. It is to be transported to a position.

A workpiece mounting reference table 5 is fixed in a fixed frame 4 of the processing station, a positioning device 1 of the present invention is provided, and a clamp device 6 is provided on the opposite side.

7 is a processing head, for example, four processing axes
It has T ₁ , T ₂ , T ₃ , and T ₄ , and can perform simultaneous machining on four points on the work W.

 Next, the positioning position 1 will be described.

2 is a view seen from the direction of arrow X in FIG. 1, and FIG. 3 is
1. FIG. 1 is a sectional view taken along the line YY 'in FIG. 1, and FIG.
FIG. 5 is a sectional view taken along the arrow Z ', and FIG. 5 is a diagram showing a three-position indexing drive unit.

As shown in FIG. 1, in this processing station, the work W is conveyed in a slightly inclined posture, and in this posture, as shown in FIG.
4 machining axes T ₁ , T ₂ , T ₃ , T ₄ provided at 4 locations
Simultaneous machining of A ₁ , A ₂ , A ₃ and A ₄ is performed, then the work W is shifted in the transport direction by a predetermined amount L, and again at a position displaced by a predetermined amount L on the same work W at the second position. same four processing axis _{T 1, T 2, T 3} , by T ₄ 4 points _{B 1, B 2, B 3} , B 4
By performing the simultaneous processing of, it is possible to perform processing at a total of eight locations at the same processing station.

The positioning device 1 has two locate pins 8A, 8A for positioning the work W at the first position and two locate pins 8B for positioning the work W at the second position.
Two sets of locate pins 8A and 8B are provided, two sets of 8B each.

As shown in FIG. 3, each locate pin 8A, 8B is supported by the tip of each saddle 9A, 9B, and each saddle 9A, 9B.
Is a locate pin for the support frame 4a fixed to the fixed frame 4.
8A and 8B are slidably guided and supported along two guide rods 10A and 10B, respectively, which are inclined and fixed in the same direction as the positioning operation direction.

Then, each of the saddles 9A and 9B has an arm 11
A and 11B are fixed, and engaging grooves 12A and 12B that form engaging means described later are formed at the ends of the arms 11A and 11B, respectively.

Further, one rotary shaft 13 is rotatably supported at both ends of the fixed frame 4. Further, four swing arms 14A, 14B corresponding to the above-mentioned four arms 11A, 11B, respectively, are integrally fixed to the rotary shaft 13, and are connected to an indexing drive means described later. Drive arm 15
Are fixed integrally.

For the indexing drive means, for example, a compound cylinder 16 having two pistons 17 and 18 as shown in FIG. 5 and having the same inner diameter and a stroke ratio of 1: 2 is used. The connecting arm 19 attached to the tip of 18 is indexed and driven to _three positions P ₁ , P ₂ and P ₃ in the height direction at the backward limit, the intermediate position and the forward limit of the second piston 18. With respect to the long hole 20 formed in the connecting arm 19, the drive arm
The shaft 21 provided at the tip of the drive arm 15 is engaged to convert the linear movement of the connecting arm 19 into the rotational movement of the drive arm 15.
Is indexed in the rotational direction into three indexing positions by the first indexing position, the second indexing position, and the third indexing position at the same angle θ. This is set so that the rotating shaft 13 and the shaft 21 are located on the same horizontal plane at the second indexing position.

That is, the three index positions of the drive arm 15 give the rotary shaft 13 three positions to be indexed. Incidentally, this three position detection is performed with the three dogs D _1, D _2, D ₃ provided integrally with the connecting arm 19, the three limit switches S _1, S _2, S ₃ corresponding thereto .

Then, the swinging arms 14 provided on the rotating shaft 13
As shown in FIG. 8, A and 14B have cam followers 22A and 22B rotatably provided at their ends at the same distance from the center of rotation, and the cam followers 22A and 22B correspond to the corresponding arms.
11A and 11B are engaged with engagement grooves 12A and 12B, respectively. The cam followers 22A and 22B of the swing arm 14A corresponding to the first position and the swing arm 14B corresponding to the second position are located at the allocation angle θ of the rotary shaft 13 respectively.
However, they are fixed to the rotating shaft 13 with their phases being different from each other.

That is, the cam followers 22A, 22B and the engaging grooves 12A, 1
The above-mentioned engaging means is constituted by 2B, and as shown in FIG. 8 (1) at the first indexing position of the rotary shaft 13, as shown in FIG. 8 (2) at the second indexing position. As shown in FIG. 8 (3), each arm is in the third indexing position.
11A and 11B are displaced in the forward and backward directions of the locate pins 8A and 8B, respectively.

That is, as shown in FIG. 6, the arm 11A for driving the locate pin 8A corresponding to the first position is moved forward by the cam follower 22A of the swing arm 14A in the first indexing position, that is, the locate pin 8A locates the work W. In the second indexing position, the retracted position, that is, the position where the locate pin 8B unlocates the work W is held in the second indexed position in the same figure, and the retracted position is also maintained in the third indexed position. maintain.

The arm 11B for driving the locate pin 8B corresponding to the other second position, as shown in FIG. 7, has the retracted position, that is, the locate pin 8B moves the workpiece W at the first indexing position by the cam follower 22B of the swing arm 14B. It is held in the unlocating position and maintains the retracted position even in the second indexing position. In the third indexing position, as shown by the two-dot chain line in the figure, the forward position, that is, the locating pin 8B locates the work W. Retained.

The shape of the engagement groove 12A of the one arm 11A is formed in a straight groove perpendicular to the moving direction of the arm 11A for moving the arm 11A from the first indexing position to the second indexing position. From the second indexing position to the third indexing position, an arc groove is formed so as not to move the arm 11A. On the other hand, the shape of the engaging groove 12B of the other arm 11B is formed in a circular arc groove that does not accompany movement of the arm 11B from the first indexing position to the second indexing position. From the indexing position to the third indexing position, a linear groove is formed in the direction perpendicular to the moving direction of the arm 11B for moving the arm 11B.

Further, the clamp device 6 is composed of a clamp arm 24 pivotally supported by a support shaft 23 about a fixed frame 4 and a cylinder 25 for driving the clamp arm 24. A swing clamp piece 26 that contacts with the workpiece W is fixed to the reference surface 5a of the reference table 5 by pressing it with a predetermined pressure.

Next, the operation will be described with reference to the sequence diagram of FIG.

When transferring a work W, the first port a and the third port of the cylinder 16
Port c is on, and due to the balance of the internal pressure of the cylinder 16, the first piston 17 is stopped at the forward limit and the second piston 18 is stopped at the intermediate position. That is, the dog D _{2 of} the connecting arm 19 is in the intermediate position P ₂ , the switching S ₂ is turned on, the rotary shaft 13 is held in the second indexing position, and all the locate pins 8A and 8B are in the unlocate state. There is.

In this state, the transfer bar 2 rises and moves forward for the first time, so that the work W is transported from the pre-processing station to the first position of the main processing station along the guide rail 3.

Here, when the position is confirmed, the transfer bar 2
Lowers, then the first port a of the cylinder 16 is turned off, the fluid pressure is continuously supplied to the third port c, and the second piston 18 is moved to the backward limit together with the first piston 17, that is, FIG. Stop in the state of. That is, the connecting arm 19
Is in the upper limit position P ₁ , the dog D ₁ turns on the switch S ₁ , and the rotary shaft 13 is indexed and rotated to the first indexing position (Fig. 8 (1)). At the same time, the arm 11A is advanced through the engagement of the cam follower 22A of the swing arm 14A and the engagement groove 12A of the arm 11A, and the locate pins 8A, 8A corresponding to the first position are advanced to move the work W to the first position. Locate to. At this time, the arm 11B does not move from the retracted position due to the engagement relationship between the arc groove of the engagement groove 12B and the cam follower 22B.

When the first locate is completed, the clamp device 6 operates next, the clamp arm 24 is driven in the clamp direction, and the workpiece W is clamped by the clamp piece 26.

When the work clamp is confirmed, the first processing point A ₁ ,
Processing of A ₂ , A ₃ , and A ₄ is performed.

When the first machining is completed, the clamp device 6 performs the unclamping operation, and when the unclamping is confirmed, the cylinder is restarted.
The first port a of 16 is turned on, the second piston 18 is moved to the intermediate position, and the rotary shaft 13 is indexed to the second indexing position (Fig. 8 (2)). At the same time, swing arm 14A, arm 11A
The first locate pin 8A is retracted via the, and all locate pins 8A and 8B are in the unlocated state.

From this state, the transfer bar 2 rises again and moves forward by a predetermined amount L, so that the work W moves toward the guide rail 3
Is transported to the second position.

Here, when the position is confirmed, the transfer bar 2
Descends and retreats to its original position. Next, the third cylinder 16
At the same time as the port c is turned off, the second port b is turned on and the second piston 18 is moved to the forward limit and stopped. That is, the connecting arm 19 is in the lower limit position P ₃ , the dog D ₃ turns on the switch S ₃ , and the rotating shaft 13 is indexed and rotated to the third indexing position (Fig. 8 (3)). At the same time, swing arm 14
The arm 11B is advanced through the engagement between the cam follower 22B of B and the engagement groove 12B of the arm 11B, and the locate pins 8B, 8B corresponding to the second position are advanced to locate the work W to the second position. At this time, the arm 11A does not move from the retracted position due to the engagement relationship between the arc groove of the engagement groove 12A and the cam follower 22A.

When the second locate is completed, the clamp device 6 operates next to clamp the work. When the work clamp is confirmed, the second processing points B ₁ , B ₂ , B ₃ , and B ₄ are processed.

When the second machining is completed, the clamp device 6 performs the unclamping operation, and when the work unclamping is confirmed, the second port b of the cylinder 16 is turned off and at the same time the third port c is turned on, and Second from the internal pressure balance
The piston 18 is moved to the intermediate position and the rotary shaft 13 is indexed to the second indexing position (Fig. 8 (2)). This allows
The second locate pin 8B is retracted and all locate pins 8A,
8B is in the unlocated state, and the work W can be transported to the next processing station.

In this way, the workpiece is positioned at two positions at the same machining station, and the same machining can be performed at each position. Therefore, machining at a location twice the number of machining axes can be efficiently and easily performed in a short time.

Note that the positioning device 1 of the present invention is not limited to the structure of this embodiment, and includes all other modified structures in terms of processing type, installation space for peripheral devices, and design changes.

For example, the indexing drive means for the three positions is not limited to the composite cylinder 16, and an index motor may be used as long as the drive means can set the three positions, or separate drive means and indexing means may be provided in combination. You can also

Further, the engagement means for transmitting the rotational movement of the swing arms 14A, 14B as the backward drive of the respective arms 11A, 11B,
Not only the engagement between the engagement groove and the cam follower, but also other known motion converting means such as a link mechanism can be used.

Further, it is not necessary to provide saddles 9A and 9B, arms 11A and 11B, and swing arms 14A and 14B for each of the four locate pins 8A and 8B, and swing arms 14A and 14B common to each set are provided. You may make it respectively drive the locate pin 8A, 8B.

[Effects of the Invention] According to the present invention, two sets of locate pins corresponding to two positions for machining a workpiece are respectively connected to a common rotary shaft, and the rotary shaft is moved to three positions by one driving means. Since the positioning operations are mechanically related to each other by the indexing, the operation of both locate pins is mechanically restricted to each other by one drive source and one drive shaft.
Positioning, positioning cancellation, and second position positioning can be reliably performed. As a result, there is no deviation in the operation timing of both locate pins, and malfunction can be prevented. Moreover, it can be inexpensively constructed with a simple structure, and can be compactly installed in a narrow station space without interfering with other devices.

Furthermore, by mechanically interlocking the work transfer operation and the positioning operation, it is possible to expect an extremely reliable positioning operation without loss of time and without causing a malfunction in the machining sequence.

[Brief description of the drawings]

1 is a side view of one processing station equipped with the positioning device of the present invention, FIG. 2 is a view taken in the direction of arrow X in FIG. 1, FIG. 3 is a sectional view taken in the direction of arrow YY ′ in FIG. Fig. 4 shows ZZ 'of Fig. 1.
FIG. 5 is a sectional view taken along the arrow, FIG. 5 is a partial sectional view of the third position indexing drive unit, and FIG. 6 is an enlarged view of a main part showing the operation of one arm, and FIG.
The figure is an enlarged view of the essential part showing the operation of the other arm, FIG. 8 (1)
(2) and (3) are enlarged views of essential parts showing the states of the arms at the first, second, and third indexing positions, respectively, and FIG. 9 is a diagram showing an operation sequence of workpiece feeding, positioning, clamping, and machining. Is. 1 ... Positioning device, 4 ... Fixed frame, 8A, 8B ... Locating pin, 9A, 9B ... Saddle, 10A, 10B ... Guide rod, 11A, 11B ... Arm, 12A, 12B. Constituting engaging groove, 13 ... Rotating shaft, 14A, 14B ... Swing arm,
15, 16, 19 ... Drive arm that constitutes indexing drive means,
Compound cylinder and connecting arm, 22A, 22B ... Cam followers that make up the engaging means ... Three indexing positions, W ... Work.

Claims (2)

(57) [Claims] 1. The same work is moved to two positions, a first position and a second position, which are different in the carrying direction at the same processing station, and the work is moved to the two positions by two sets of locating pins provided corresponding to the respective positions. In the positioning device for positioning each of the two sets, the above two sets of locate pins are supported by at least each set of saddles which are guided and supported with respect to the fixed frame so as to be movable back and forth in the positioning operation direction of the locate pins. A plurality of swing arms are fixed to a single rotary shaft rotatably supported by a fixed frame with different phases for each set, and the rotary motion of each swing arm is linearly moved to each saddle. The saddle and the swing arm are engaged with each other by the engaging means for transmitting as the advancing / retreating motion, and the rotating shaft is rotated by the indexing drive means to rotate at a predetermined rotation angle. Index into three indexing positions with, the locating pin at the first position is projected at the first indexing position of this rotating shaft, and all the locating pins are held at the retracted position at the second indexing position. A positioning device characterized in that the locate pin at the second position is projected at the indexing position. 2. A rotary shaft indexing drive is interlocked with a work transfer operation, and the rotary shaft is moved to a second indexing position during work transfer.
2. The rotating shaft is driven to the first indexing position at the end of conveyance to the first position, and the rotating shaft is driven to the third indexing position at the end of conveyance to the second position. The positioning device described.