JP2007175783A - Workpiece positioning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece positioning device which avoids upsizing of the overall body thereof by forming a through hole in a fastening tool in an axial direction, and by inserting into the through hole a detecting pin for detecting a state of workpiece being seated on a workpiece seating surface. <P>SOLUTION: In the workpiece positioning device, a positioning pin 5 has its fixing flange portion 13 on its proximal side fixed to a distal end of a post portion 3 by means of four bolts 7 each having a hexagonal hole. Then one of the bolts 7 having the hexagonal hole has the through hole 7b penetrated therein in the axial direction, in which a shaft narrow-diameter portion 19b of the detecting pin 19 is inserted. In the detecting pin 19, the shaft narrow-diameter portion 19b and a shaft large-diameter portion 19c which are located on a rear end of the detecting pin 19 move in a detecting pin insertion hole 21 formed in the post portion 3, and a dog portion 19d arranged on a more rear end is detected by a proximity sensor 27. Then while a pin portion 9 of the positioning pin 5 is inserted into the positioning hole Wa formed in the workpiece W that is kept seated on the workpiece seating surface 11a, the detecting pin 19 is pressed by the workpiece W and moved downward. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a workpiece positioning device that performs positioning by inserting a positioning pin into a positioning hole formed in a workpiece.

  As an apparatus for positioning a workpiece using a positioning pin, for example, a device described in Patent Document 1 below is known. In this positioning device, a seating flange portion having a workpiece seating surface is provided at the base portion of the positioning pin, and a detection pin capable of appearing and retracting for detecting the seating of the workpiece is provided on the workpiece seating surface. The proximity sensor detects through a shaft extended toward the rear end side. Further, the positioning pin is coupled and fixed to the front end side of the post portion serving as the positioning device main body by a plurality of bolts with the seating flange portion interposed through the spacer.

Here, the detection pins are arranged near the center axis of the positioning pins, while the shafts detected by the proximity sensors are arranged offset with respect to the positioning pins so as to be separated from each other in the diameter direction. The positioning pin is connected by a connecting plate.
Japanese Patent Laying-Open No. 2004-299052 (see paragraphs 0041 to 0046 and FIGS. 8 to 10)

  By the way, in the positioning device as described above, when the seating flange portion of the cylindrical positioning pin is fixed to the post portion, when the seating flange portion is a quadrangular prism shape, the fixing portion by the bolt is provided in a relatively wide area of the four corners. Will be set. At that time, since the detection pin is set in a narrow area between the adjacent bolt fixing portions, it is difficult to attach the detection mechanism including the detection pin. As in the case of the device, it is necessary to offset the detection pin and the shaft, or it is necessary to form a large seating flange portion, which increases the size of the entire positioning device.

  Therefore, an object of the present invention is to prevent an increase in the size of the entire positioning device.

  The present invention provides a workpiece positioning apparatus that performs positioning by inserting a positioning pin into a positioning hole formed in a workpiece, and forms a flange portion having a workpiece seating surface at a base end portion of the positioning pin. The distal end portion of the apparatus body is coupled by a fastener inserted from the distal end side to the proximal end side of the positioning pin, and a through-hole penetrating in the axial direction is provided in the fastener. The most important feature is that a detection pin for detecting a seating state of the workpiece on the workpiece seating surface is inserted.

  According to the present invention, the through hole is provided in the fastener for fixing the flange portion to the positioning device body, and the detection pin for detecting the seating state of the workpiece with respect to the workpiece seating surface is inserted into the through hole. There is no need to offset the shaft portion, and there is no need to separately form a large flange portion in order to arrange the detection pin. Therefore, an increase in the size of the entire positioning device can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of a positioning device showing an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a perspective view showing a part of the leading end side of the positioning device. This positioning device includes a hollow post portion 3 as a positioning device main body on a base portion 1, positioning pins 5 at tip portions (upper end portions) of the post portion 3, and hexagon socket bolts 7 as a plurality of fasteners. It is fixed.

  The positioning pin 5 has a pin portion 9 at the tip, and a seating flange portion 11 having a workpiece seating surface 11a is provided at the base end portion of the pin portion 9, and the bolt is further provided on the base end side of the seating flange portion 11. 7 is provided as a flange portion for fastening 7.

  The above-described pin portion 9 has a spherical shape with a convex tip, and has a cylindrical shape as a whole. The pin portion 9 is inserted into a positioning hole Wa formed in the workpiece W (see FIG. 6) and positioned with respect to the workpiece W. The seating flange portion 11 has a cylindrical shape having a diameter larger than that of the pin portion 9, and when the workpiece W is positioned, the workpiece W is seated on the workpiece seating surface 11a on the upper surface thereof.

  Further, a slit groove 15 penetrating in the diameter direction is formed in the positioning pin 5, and a clamp arm 17 having a substantially bowl-shaped tip is formed in an internal space extending from the slit groove 15 to the post portion 3. It is movably accommodated. The clamp arm 17 has a flange-shaped tip portion facing the outside from the opening 15a of the slit groove 15 in the pin portion 9, and the other end (lower end in FIG. 1) is not shown. It is connected to the piston rod.

  The clamp arm 17 is moved between the unclamping position in FIG. 1 and the clamping position in FIG. 6 by the operation of the clamp cylinder described above, and on the workpiece seating surface 11a in the state of FIG. The workpiece W is clamped and held between the workpiece seating surface 11a.

  Such a positioning pin provided with the clamp arm 17 is a known technique disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-299052 (the aforementioned Patent Document 1) proposed by the present applicant.

  As shown in FIG. 2, the fixed flange portion 13 located on the most proximal side of the positioning pin 5 has a substantially square prism shape protruding outward from the cylindrical seating flange portion 11, and its lower end portion is a post The four corners are fitted and fixed to the post portion 3 by the hexagon socket head bolt 7 as described above. These hexagon socket head bolts 7 are fastened to the screw holes 3b formed in the post portion 3 while being inserted into the bolt insertion holes 13a formed in the fixing flange portion 13, and are formed at the upper portion of the bolt insertion holes 13a. The head 7a is inserted and buried in the counterbore 13b.

  Of the four hexagon socket head bolts 7 provided at the four corners of the fixed flange portion 13, the one hexagon socket head bolt 7 located at the lower right in FIG. 2 covers the entire length from the head 7a to the threaded portion. A through hole 7b penetrating along the axial direction is provided. A detection pin 19 for detecting the workpiece W seated on the workpiece seating surface 11a is inserted into the through hole 7b.

  As shown in FIG. 4, the detection pin 19 protrudes upward from the counterbore 13b and has a detection pin main body 19a set so that its tip position is higher than the workpiece seating surface 11a, and the rear of the detection pin main body 19a. A shaft small-diameter portion 19b which is located on the end side (lower side in FIGS. 1 and 4) and is movably inserted into the through-hole 7b of the hexagon socket head bolt 7 having a smaller diameter than the detection pin main body 19a. The large shaft portion 19c is located on the rear end side of the small shaft portion 19b and has a diameter larger than that of the small shaft portion 19b, and the dog portion as a detected portion is located on the rear end portion of the large shaft portion 19c. 19d and a spring seat 19f provided via an extension 19e on the opposite side of the large-diameter portion 19c of the dog portion 19d. The dog portion 19d and the spring seat 19f have substantially the same outer diameter.

  Such a detection pin 19 is moved into a detection pin insertion hole 21 formed in a vertical direction in FIG. 1 at a lateral position of the internal space for accommodating the clamp arm 17 in the post portion 3. In this case, a part of the shaft small diameter portion 19b is inserted into the through hole 7b of the hexagon socket head bolt 7.

  The detection pin insertion hole 21 includes a dog portion moving portion 21a having a dog portion 19d and a spring receiving seat 19f that are movable up and down, and having a diameter that is substantially the same as or slightly larger than the outer diameter of the dog portion 19d and the spring receiving seat 19f. The shaft small-diameter portion moving portion 21b, which is located above the portion moving portion 21a and in which a part of the shaft thin-diameter portion 19b moves, is provided.

  A spring accommodating portion 23 that is continuous with the dog portion moving portion 21 a is provided behind the spring receiving seat 19 f (downward in FIG. 1), and the coil spring 25 is accommodated in the spring accommodating portion 23. The coil spring 25 presses the detection pin 19 upward in FIG. 1, whereby the detection pin main body 19a protrudes upward from the workpiece seating surface 11a as shown in FIG. At this time, the upper end of the shaft large diameter portion 19c abuts on the upper lower surface of the dog portion moving portion 21a to restrict the upward movement of the detection pin 19, and the shaft small diameter portion 19b is the shaft small diameter portion moving portion 21b. It is located in the length range from the lower end of the seat flange portion 11 to the substantially vertical center position.

  A proximity sensor 27 for detecting the dog portion 19 d of the detection pin 19 is provided on the side surface of the post portion 3 on the lower side of the detection pin insertion hole 21. The proximity sensor 27 is positioned below the dog portion 19d in FIG. 1 with the coil spring 25 pressing the detection pin 19 upward and the detection pin body 19a protruding upward from the workpiece seating surface 11a. .

  The counterbore 13b formed in the fixed flange portion 13 has a space 13c above the head 7a in a state where the head 7a of the hexagon socket head cap bolt 7 is inserted, and a resin-made foreign substance in the space 13c. A foreign matter intrusion prevention bush 29 as an intrusion prevention member is fitted and fixed.

  The foreign matter intrusion prevention bush 29 prevents foreign matters such as dust from entering the through hole 7b of the hexagon socket head bolt 7 and the detection pin insertion hole 21 of the post portion 3, and is shown as a perspective view in FIG. As described above, the lower insertion portion 29a, the upper small-diameter portion 29b having an outer diameter smaller than the insertion portion 29a located at the upper portion, and the outer diameter having the largest outer diameter are located between the insertion portion 29a and the upper small-diameter portion 29b. Each of which has a large-diameter portion 29c, and a detection pin insertion hole 29d penetrating vertically therethrough.

  The detection pin insertion hole 29d has an inner diameter substantially equal to the outer diameter of the detection pin main body 19a so that the detection pin main body 19a can slide over the outer periphery of the detection pin main body 19a.

  The foreign matter intrusion prevention bush 29 is mounted on the fixed flange portion 13 by inserting the insertion portion 29a into the space 13c of the counterbore 13b. At this time, the detection pin body 19a of the detection pin 19 is detected. It is movably inserted into the pin insertion hole 29d. At this time, the upper surface 29e of the upper small-diameter portion 29b is flush with the workpiece seating surface 11a or is positioned below the workpiece seating surface 11a in FIG.

  In the workpiece positioning apparatus configured as described above, the clamp arm 17 is in the unclamping position indicated by the broken line as shown in FIG. 1, and the pin portion 9 of the positioning pin 5 is positioned as shown in FIG. The workpiece W is seated on the workpiece seating surface 11a of the positioning pin 5 while being inserted into the hole Wa.

  At this time, the workpiece W is brought into contact with the detection pin main body 19a, so that the entire detection pin 19 is pressed and moved downward against the elastic force of the coil spring 25, and the dog portion 19d is also moved downward accordingly. Detected by the proximity sensor 27, it is detected that the workpiece W is seated on the workpiece seating surface 11a.

  Thereafter, by operating a clamp cylinder (not shown), the clamp arm 17 is moved from the unclamping position shown in FIG. 1 to the clamping position shown in FIG. 6, and the workpiece W is moved between the clamping arm 17 and the workpiece seating surface 11a. Hold it.

  According to such a workpiece positioning device, since the detection pin 19 is inserted into the through hole 7b of the hexagon socket head bolt 7 for fixing the fixing flange portion 13 of the positioning pin 5 to the post portion 3, the positioning pin 19 Even if the fixed flange portion 13 is formed in a quadrangular prism shape and the hexagon socket head bolt 7 is set at the four corners of the fixed flange portion 13 with a cylindrical shape on the tip side from the fixed flange portion 13 of FIG. Since the detection pin 19 is provided in the region, the work detection mechanism including the detection pin 19 can be easily attached.

  For this reason, it is not necessary to offset the detection pin 19 and the shaft large diameter portion 19c and the shaft small diameter portion 19b having the dog portion 19d on the rear end side that detects the movement of the detection pin 19 with each other. In addition, it is not necessary to form the fixing flange portion 13 in a large size, so that the positioning device as a whole can be prevented from being enlarged and interference with surrounding equipment can be prevented.

  In the present embodiment, as described above, the detection pin 19, the large shaft diameter portion 19c having the dog portion 19d, and the small shaft diameter portion 19b are collinear, and they are not offset from each other. .

  For this reason, it is possible to prevent the occurrence of galling at the sliding portion when the detection pin 19 moves, as in the case where they are offset from each other, and the operation of the detection pin 19 is smooth and stable workpiece detection operation. Can be implemented. In addition, in order to prevent the above-described galling in the offset arrangement, if the elastic force of the coil spring that presses the detection pin toward the tip end is increased too much, the workpiece is moved when the detection pin comes into contact with the workpiece. However, according to the present embodiment, since the offset is not arranged, it is not necessary to set the elastic force of the coil spring 25 strongly. Can be prevented.

  Moreover, since the detection pin 19 is thicker than the shaft small diameter portion 19b inserted into the through hole 7b of the hexagon socket head bolt 7 in the detection pin 19, the strength when the workpiece W comes into contact is ensured. In addition, the workpiece detection operation can be performed with high accuracy and a long life can be achieved.

  Since the foreign matter intrusion prevention bush 29 is provided on the fixed flange portion 13 of the positioning pin 5 so as to cover the outer periphery of the detection pin main body 19a and the detection pin main body 19a slides, foreign matters such as dust are Intrusion into the through hole 7b of the attached bolt 7 and the detection pin insertion hole 21 of the post portion 3 can be prevented, and as a result, the detection pin 19 is moved in a stable state, and the workpiece detection operation can be performed with high accuracy. it can.

  Further, the foreign matter intrusion prevention bush 29 is fitted onto the fixed flange portion 13 by inserting the foreign matter intrusion prevention bush 29 into the space 13c on the opening side of the counterbore 13b provided on the surface of the fixed flange portion 13 of the positioning pin 5. Can be easily attached to.

  In the above-described embodiment, the clamp arm 17 is provided. However, the present invention can be applied to a positioning device that does not include the clamp arm 17.

It is a front view of a positioning device showing one embodiment of the present invention. It is a top view of FIG. It is a perspective view which shows a part of positioning device front end side of FIG. It is a front view of the detection pin used for the positioning device of FIG. It is a perspective view of the bush for foreign material penetration | invasion prevention used for the positioning device of FIG. It is operation | movement explanatory drawing of the workpiece | work positioning device of FIG.

Explanation of symbols

W Work Wa Positioning hole 3 Post part (positioning device main body)
5 Positioning pin 7 Hexagon socket head cap screw (fastener)
7a Hexagon socket head bolt through hole 11a Workpiece seating surface 13 Fixed flange (flange)
13b Counterbore 13c Space provided on the opening side of the counterbore 19 Detection pin 19a Detection pin body (tip end of detection pin)
19b Shaft narrow diameter part (detection pin insertion part to fastener)
19d Dog part (detected part)
27 Proximity sensor (sensor)
29 Bushings for preventing foreign matter entry (members for preventing foreign matter entry)

Claims (6)

  In a workpiece positioning device for positioning by inserting a positioning pin into a positioning hole formed in a workpiece, a flange portion having a workpiece seating surface is formed at a base end portion of the positioning pin, and the flange portion is a tip of a positioning device main body. The part is coupled by a fastener that is inserted from the distal end side to the proximal end side of the positioning pin, and a through hole that penetrates along the axial direction is provided in the fastener, and the workpiece of the workpiece is provided in the through hole. A workpiece positioning device, wherein a detection pin for detecting a seating state on a seating surface is inserted.   The positioning device main body is provided with a sensor for detecting the backward movement of the detection pin when the workpiece is seated on the workpiece seating surface, and the detected portion detected by the sensor is connected to the tip portion of the detection pin. The workpiece positioning device according to claim 1, wherein the workpiece positioning devices are set in the same straight line.   3. The workpiece positioning device according to claim 1, wherein the detection pin has a tip portion that contacts the workpiece thicker than an insertion portion into the fastener.   The front end side of the flange portion of the positioning pin has a cylindrical shape, the flange portion has a quadrangular prism shape, and the fastener is provided at a corner portion of the flange portion of the quadrangular prism shape. Item 4. The workpiece positioning device according to any one of Items 1 to 3.   5. The foreign matter intrusion prevention member that covers the outer peripheral portion of the detection pin and slides the detection pin is provided on the flange portion of the positioning pin. 6. Work positioning device.   A counterbore hole for embedding the head of the fastener is provided on the surface of the flange portion of the positioning pin, and the foreign matter intrusion prevention member is inserted into a space provided on the opening side of the counterbore hole. The workpiece positioning apparatus according to claim 5.

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