JP2018020383A - Pin clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pin clamp device which uses only one cylinder, prevents powder and other fine foreign objects adhering as spatter from entering into the device and adhering to a slide part, such as a piston rod and a cam mechanism, is inexpensive, and achieves high operation reliability.SOLUTION: A pin clamp device includes: a housing 8; a workpiece contact member 3; and a cylinder 13 having a piston rod 16. The pin clamp device includes a cylindrical body 32 which movably fits in the housing 8 and includes a movable pin 31 which is provided with a locate pin 5 and connected to the piston rod 16. The pin clamp device further includes: a swing type clamp arm 4 having a claw 45; and a cam mechanism 51 which has a cam 47 positioned in the movable pin 31 and swings the clamp arm 4. A ring 37 having a function of a bearing which slides on an inner peripheral surface of the housing 8 and a function of sealing a space between the housing 8 and the cylindrical part is provided at an outer periphery part of the cylindrical body 32 of the movable pin 31.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pin clamp device provided with a locate pin penetrating a plate-like component.

  2. Description of the Related Art Conventionally, for example, plate-like parts used in, for example, automobile bodies are often welded to other plate-like parts by spot welding when the car body is assembled. Two plate-like parts to be welded by spot welding are held in a state where they overlap each other by a pin clamp device. When spot welding is performed, it is known that spatter scatters and adheres to a plate-shaped component or the tip of a clamping device.

Examples of this type of conventional pin clamp device include those described in Patent Document 1 and Patent Document 2, for example.
The pin clamp device described in Patent Document 1 includes a locate pin that fits into a positioning hole drilled in a plate-like component, and a swinging clamp arm that has a claw that clamps the plate-like component. Yes.

  The locate pin is driven by the first cylinder to move forward or backward. The clamp arm is driven by the second cylinder, and swings so that the pawl is accommodated in the locate pin while moving forward. The clamp arm is driven by the second cylinder and swings so that the claw protrudes from the locate pin while moving backward. In the pin clamp device disclosed in Patent Document 1, the two clam parts are clamped by the claws of the clamp arm projecting in a stroke in which the clamp arm is driven back by the second cylinder.

  5 to 7 of Patent Document 2 show a pin clamp device in which a locating pin and a swinging clamp arm are driven by one cylinder. The locate pin is connected to the piston rod of the cylinder, and moves forward or backward together with the piston rod. The clamp arm is disposed inside the locating pin, and is supported by the locating pin in a swingable manner at an intermediate portion in the longitudinal direction. A claw is provided at one end of the clamp arm, and a cam mechanism is connected to the other end.

The cam mechanism swings the clamp arm so that the claw protrudes from the slit of the locating pin in the stroke in which the locating pin moves forward. Further, the cam mechanism swings the clamp arm so that the claw is accommodated in the slit of the locating pin in the process of retracting the locating pin. The nail | claw is formed in the shape by which the opening part of a slit is obstruct | occluded in the state protruded from the slit.
By closing the opening of the slit in this way, it is possible to prevent spatter from entering the apparatus during spot welding.

Utility Model Registration No. 2604153 JP 2016-34683 A

In the pin clamp device shown in Patent Document 1, two cylinders are required, and thus there is a problem that the manufacturing cost increases.
In the pin clamp device shown in Patent Document 2, there is a time when the opening of the slit is opened in the process of storing the claw in the slit of the locate pin in order to release the plate-like member after welding. For this reason, in this pin clamp device, there is a possibility that powder or other fine foreign substances adhering to the surface of the plate-like part or the locating pin during spot welding enter the device from the opening of the slit. In this specification, the powder adhered as spatter is simply referred to as “sputter powder”.
If spatter powder or other fine foreign matter entering the pink lamp device adheres to sliding parts such as the piston rod and cam mechanism, the pin clamp device is liable to malfunction.

  The present invention has been made to solve such a problem, and while using only one cylinder, spatter powder and other fine foreign matters enter the apparatus and slide the piston rod, cam mechanism, etc. An object of the present invention is to provide a pin clamp device that is prevented from adhering to a portion and is low in cost and high in operation reliability.

  In order to achieve this object, a pin clamp device according to the present invention includes a cylindrical housing, a workpiece contact portion provided at one end portion of the housing, and provided at the other end portion of the housing. A cylinder having a piston rod that reciprocates in a direction parallel to the center line of the cylinder, and a cylindrical portion that is movably fitted to the inner peripheral portion of the housing, and that protrudes from the workpiece contact portion on one end side The locating pin is provided, and the other end of the locating pin is disposed inside the movable pin in a state of being swingably connected to the piston rod. A claw arm provided at one end with a claw that enters and exits the hollow portion of the locating pin through a lateral hole; and a cam positioned inside the movable pin; A cam mechanism for converting the reciprocating motion of the ton rod into a swinging motion and swinging the clamp arm with respect to the movable pin, and an inner peripheral surface of the housing on an outer peripheral portion of the cylindrical portion of the movable pin A ring having a function of a bearing that slides on and a function of sealing between the housing and the cylindrical portion is provided.

  In the pin clamp device according to the present invention, the claw may be formed in a shape in which the lateral hole is closed in a state of protruding from the locate pin through the lateral hole.

  In the pin clamp device according to the present invention, the work contact portion has a through hole through which the locate pin passes, and the movable pin constitutes the cylindrical portion and is connected to the piston rod, And a locating pin having a shaft portion slidably fitted in the through hole and having a connecting portion fitted to the inner peripheral portion of the cylindrical body, wherein the connecting portion is formed of the cylindrical body. It may be fixed to the cylindrical body via a plurality of connecting pins extending in the radial direction, and movement of the connecting pins outward in the radial direction may be restricted by the ring.

  According to the present invention, in the pin clamp device, the cam mechanism is parallel to the center line in a state in which the cam mechanism includes a through hole formed in the clamp arm and the cylindrical portion of the movable pin in a radial direction. An elongated hole extending in the radial direction of the housing, passing through the elongated hole and the cam, and having both ends fixed to the housing, and constituting a cam follower, wherein the locating pin is the workpiece. When the clamp arm moves in the first direction protruding from the contact portion, the claw is accommodated in the locate pin, and the clamp arm moves in the second direction opposite to the first direction. Thus, the claw may be formed in a shape protruding from the locate pin.

  According to the present invention, when the piston rod of the cylinder moves forward or backward, the locating pin moves forward or backward, and the clamp arm swings and the claw moves in and out. For example, when the locate pin is passed through a workpiece such as a sheet metal part or other plate-like part, the locate pin is retracted to the cylinder side, and the claw protrudes from the locate pin so that the work is sandwiched between the workpiece contact portion and the claw. Held.

For this reason, since the locating pin and the clamp arm can be driven by one cylinder to hold or release the workpiece, the manufacturing cost can be kept low.
Also, since the space between the cylindrical portion of the movable pin and the housing is sealed by the ring, even if spatter powder or other fine foreign matter enters the apparatus from between the workpiece contact portion and the movable pin, these Intruders do not adhere to the sliding portion of the piston rod or the cam of the cam mechanism.
Therefore, according to the present invention, it is possible to use one cylinder, and it is possible to prevent the intruding material from adhering to the sliding portion such as the piston rod and the cam. A pin clamp device with high reliability can be provided.

It is sectional drawing of the pin clamp apparatus which concerns on this invention. FIG. 1 shows a state where a plate-like component is held. It is sectional drawing of the pin clamp apparatus which concerns on this invention. FIG. 2 shows a state where the claw is located at the retracted position. It is a front view of a pink lamp apparatus. It is sectional drawing which expands and shows the front-end part of a pink lamp apparatus. It is the VV sectional view taken on the line in FIG. It is the VI-VI sectional view taken on the line in FIG. It is sectional drawing of a cylindrical body.

Hereinafter, an embodiment of a pin clamp device according to the present invention will be described in detail with reference to FIGS.
A pin clamp device 1 shown in FIG. 1 is for holding a plurality of plate-like components 2 as works shown on the left side in FIG. Although two plate-like components 2 are drawn in FIG. 1, the number of plate-like components 2 can be changed as appropriate. In the following, the left side where the plate-like component 2 is located in FIG. 1 will be described as the front side of the pin clamp device 1, and the opposite side will be described as the rear side of the pin clamp device 1. The “one end” in the present invention corresponds to the front end in this embodiment. The “other end” in the present invention corresponds to the rear end in this embodiment. Furthermore, in the following description, the direction orthogonal to the paper surface of FIG.

  The plate-like component 2 has a through hole 2a for positioning. As will be described in detail later, the pink lamp device 1 has a workpiece contact member 3 and a clamp arm 4 that sandwich a plurality of plate-like components 2 from both sides in the thickness direction, and a locate pin 5 that fits into a through hole 2 a of the plate-like component 2. Etc.

<Housing configuration>
The workpiece contact member 3 corresponds to the “work contact portion” in the present invention, and is constituted by an annular disc portion 3a and a cylindrical portion 3b protruding forward from the disc portion 3a. A through hole 6 through which the locate pin 5 passes is formed.
As shown in FIG. 3, the plate-like portion 3 a is fixed to a front end portion of the housing 8 described later with a plurality of fixing bolts.
As shown in FIG. 1, a ring-shaped sealing member 9 for sealing between the locating pins 5 is provided on the hole wall surface of the through hole 6.

The housing 8 provided with the workpiece contact member 3 at the front end includes a main body 11 formed in a cylindrical shape, and plate-like attachments 12 that protrude from the rear end of the main body 11 to the left and right sides ( 3). The front-rear direction of the pin clamp device 1 is a direction parallel to the center line C of the main body 11 of the housing 8.
The attachment portion 12 is attached to a tool attachment seat of a robot arm (not shown).

<Cylinder configuration>
A cylinder 13 is attached to the rear end of the housing 8. The cylinder 13 is an air cylinder, a cylinder main body 14 fixed to the housing 8 by fixing bolts (not shown), a piston 15 movably fitted in the cylinder main body 14 in the front-rear direction, A piston rod 16 extending forward from the piston 15 is provided.

  The cylinder body 14 includes a cylinder 14a located on the same axis as the body 11 of the housing 8, a front lid 14b that closes the front end of the cylinder 14a, and a rear lid that closes the rear end of the cylinder 14a. 14c. The piston 15 is fitted to the inner peripheral portion of the cylinder 14a so as to be movable in the front-rear direction. A front air port 17 and a rear air port 18 are formed at the front end and the rear end of the cylinder 14a, respectively. The front air port 17 communicates with a front air chamber 19 formed in front of the piston 15. The rear air port 18 communicates with a rear air chamber 20 formed on the rear side of the piston 15. An air supply device (not shown) is connected to the front air port 17 and the rear air port 18. The piston 15 moves forward when compressed air is supplied from the air supply device to the rear air port 18. Further, the compressed air is supplied from the air supply device to the front air port 17 so that the piston 15 moves backward.

  A through hole 21 is formed in the front lid body 14b so as to allow the piston rod 16 to pass therethrough. The through hole 21 is formed in a shape in which the piston rod 16 is movably fitted. Further, the front lid body 14 b includes a sealing member 22 for sealing between the piston rod 16 and the front lid body 14 b.

The piston 15 is formed in a disc shape, and includes a seal member 24 for sealing a gap between the position detecting magnet 23 and the cylinder 14a on the outer peripheral surface.
The piston rod 16 is positioned on the same axis as the above-described center line, and is fixed to the piston 15 by a fixing bolt 25. Further, the piston rod 16 extends through the front lid body 14 b and into the main body 11 of the housing 8. The piston rod 16 reciprocates in the front-rear direction (direction parallel to the center line C of the main body 11 described above) integrally with the piston 15.

A slit 26 for inserting a rear end portion of a clamp arm 4 to be described later is formed at the center portion in the left-right direction of the front end portion 16a of the piston rod 16. The slit 26 is formed to extend in the front-rear direction.
A movable pin 31, which will be described later, is connected to the front end portion 16 a of the piston rod 16 through a first connecting pin 27 that crosses the slit 26. The first connecting pin 27 is formed in a columnar shape and penetrates the front end portion 16a of the piston rod 16 and a cylindrical body 32 of the movable pin 31 described later in the left-right direction, as shown in FIG. .

<Configuration of movable pin>
As shown in FIG. 1, the movable pin 31 has a hollow locate pin 5 on the front end side, and moves in the front-rear direction integrally with the piston rod 16. The movable pin 31 according to this embodiment is coupled to the piston rod 16 via a first coupling pin 27 and is connected to the front end portion of the cylindrical body 32 by a plurality of second coupling pins 33. The locating pin 5 is divided.

<Configuration of cylindrical body>
The cylindrical body 32 constitutes a “tubular portion” in the present invention, and is fitted into the main body portion 11 of the housing 8 so as to be movable in the front-rear direction. As shown in FIG. 5, the first connecting pin 27 described above penetrates the cylindrical body 32 in the radial direction in a state of fitting into a through hole 34 formed in the rear end portion of the cylindrical body 32.

  As shown in FIG. 7, a first annular groove 35 and a second annular groove 36 extending in the circumferential direction of the cylindrical body 32 are formed in the outer peripheral portion of the cylindrical body 32, as shown in FIG. 7. ing. Rings 37 are mounted in the first and second annular grooves 35 and 36, respectively. These rings 37 are formed in a shape that fits in the first and second annular grooves 35 and 36 and is movably fitted in the inner peripheral surface of the main body 11. The material forming these rings 37 is a plastic material capable of realizing the following two functions. The first function is a function as a bearing that slides on the inner peripheral surface of the main body 11. The second function is a function of sealing between the main body 11 and the cylindrical body 32. The cylindrical body 32 is mounted in the main body 11 through these rings 37, so that it is positioned on the same axis as the main body 11 and is supported by the main body 11 so as to be movable in the front-rear direction. . Further, even when spatter powder or other fine foreign matter enters the housing 8 from between the workpiece contact member 3 and the locate pin 5, the ring 37 prevents further intrusion of these intrusions.

  Of the first and second annular grooves 35, 36, the first annular groove 35 located on the rear side is at the same position as the first connecting pin 27 in the front-rear direction, as shown in FIGS. 1 and 5. Is formed. For this reason, the first connecting pin 27 is held in the cylindrical body 32 in a state in which the movement of the cylindrical body 32 in the radial direction is restricted by the ring 37 mounted in the first annular groove 35. . That is, the ring 37 attached to the first annular groove 25 also functions as a component for preventing the first connecting pin 27 from coming off.

  Of the first and second annular grooves 35, 36, the second annular groove 36 located on the front side is formed at the same position as a second connecting pin 33 described later in the front-rear direction. The second connecting pin 33 is for connecting the locate pin 5 to the cylindrical body 32. The second connecting pin 33 is fitted into a pin hole 38 (see FIG. 7) extending in the radial direction of the cylindrical body 32 and inserted from the outside in the radial direction into the rear end portion of the locate pin 5 described later. The second connecting pin 33 and the pin hole 38 according to this embodiment are respectively provided at positions that divide the cylindrical body 32 into four equal parts in the circumferential direction. These second connecting pins 33 are held by the cylindrical body 32 in a state where movement of the cylindrical body 32 in the radial direction is restricted by a ring 37 mounted in the second annular groove 36. . That is, the ring 37 mounted in the second annular groove 36 functions as a component for preventing the second connecting pin 33 from coming off. In this embodiment, the second connecting pin 33 corresponds to a “connecting pin” in the present invention.

  As shown in FIG. 7, a long hole 39 is formed in an intermediate portion in the front-rear direction of the cylindrical body 32. The elongated holes 39 are respectively formed at positions that divide the cylindrical body 32 into two equal parts in the circumferential direction. The width of the long hole 39 in the circumferential direction of the cylindrical body 32 is a width in which a fixing pin 41 (see FIG. 1 and FIG. 6) described later is movably fitted. The width of the long hole 39 in the front-rear direction of the cylindrical body 32 is slightly longer than the reciprocating stroke of the piston 15 described above.

<Configuration of locate pin>
The locate pin 5 is formed in a hollow cylindrical shape extending in the front-rear direction. The locate pin 5 can be formed of a material that hardly adheres to spatter. Further, the locating pin 5 can be subjected to a surface treatment that makes it difficult for spatter to adhere thereto. The locate pin 5 according to this embodiment has the following four functional units.

The first functional part is a guide part 5 a provided at the tip part of the locate pin 5 in order to make it easy to enter the through hole 2 a of the plate-like component 2. The guide part 5a is formed in a shape that becomes gradually thinner toward the front.
The second functional part is a shaft part 5 b that is movably fitted in the through hole 6 of the workpiece contact member 3. As shown in FIG. 1, the length of the shaft portion 5 b is such that the tip of the locate pin 5 protrudes forward from the workpiece contact member 3 when the movable pin 31 moves rearward together with the piston rod 16. It is the length to do.

  The third functional part is a connecting part 5 c for connecting the rear end part of the locate pin 5 to the cylindrical body 32. The connecting portion 5 c is formed in a disc shape that fits into the front end portion of the cylindrical body 32. A concave portion 42 into which the above-described second connection pin 33 is inserted is formed in the outer peripheral portion of the connection portion 5c. The concave portion 42 is provided at a position that divides the connecting portion 5 c into four equal parts in the circumferential direction and corresponding to the four second connecting pins 33. An annular spacer 43 is fitted in the recess 42.

  The distal end portion of the second connecting pin 33 is fitted in the hollow portion of the spacer 43. For this reason, the connecting portion 5 c of the locate pin 5 is connected to the front end portion of the cylindrical body 32 via the spacer 43 and the second connecting pin 33. With this connection structure, the cylindrical body 32 and the locate pin 5 are connected in a state where one cannot move in the front-rear direction with respect to the other.

  The fourth functional part is a hollow part 5d for accommodating a clamp arm 4 described later. The hollow portion 5d opens at the rear end of the locate pin 5, and extends forward from the rear end of the locate pin 5 through the shaft portion 5b to the vicinity of the rear end of the guide portion 5a. The opening shape of the hollow portion 5d is a rectangle in which a locating pin 5 described later is movably fitted. The front end portion of the hollow portion 5d communicates with the outside of the locating pin 5 via a lateral hole 44 that opens to the outer peripheral surface of the shaft portion 5b. The direction in which the lateral hole 44 is opened is an upper direction in FIG. 1 and a direction orthogonal to the front-rear direction and the axial direction of the first connecting pin 27. The opening shape of the horizontal hole 44 is a rectangle extending in the front-rear direction with a predetermined width when viewed from the opening direction. The predetermined width is a width corresponding to the thickness of the clamp arm 4 and is a width in which a later-described claw 45 provided at the front end portion of the clamp arm 4 is fitted.

<Configuration of clamp arm>
The clamp arm 4 is formed in a plate shape elongated in the front-rear direction, and is accommodated in the hollow portion 5 d of the locate pin 5 and the inside of the cylindrical body 32. The plate-like clamp arm 4 is used in a state where the side surface (main surface) extends in the front-rear direction and extends in a direction orthogonal to the axial direction of the first connecting pin 27.

A claw 45 is provided at the front end of the clamp arm 4, and a pin hole 46 is formed at the rear end. In addition, a cam 47 is provided at an intermediate portion of the clamp arm 4.
The claw 45 is formed integrally with the other part of the clamp arm 4 and protrudes in a predetermined direction from the other part. This predetermined direction is a direction orthogonal to the front-rear direction and the axial direction of the first connecting pin 27 and is a direction directed from the center of the locate pin 5 toward the horizontal hole 44.

  The pin hole 46 at the rear end of the clamp arm 4 is formed in a shape in which the first connecting pin 27 is rotatably fitted. The first connecting pin 27 is fitted in the pin hole 46 in a state where the rear end portion of the clamp arm 4 is inserted into the slit 26 of the piston rod 16. By fitting the first connecting pin 27 into the pin hole 46 in this way, the clamp arm 4 is supported by the piston rod 16 and the cylindrical body 32 via the first connecting pin 27 so as to be swingable. Become. The swing direction of the clamp arm 4 is a direction along a virtual plane orthogonal to the first connecting pin 27.

By swinging the clamp arm 4, the claw 45 enters and exits through the lateral hole 44 with respect to the hollow portion 5 d of the locate pin 5. The claw 45 according to this embodiment has a clamp position that protrudes from the locate pin 5 as shown in FIG. 1 and a retracted position that is accommodated in the locate pin 5 as shown in FIG. 2 when the clamp arm 4 swings. Move between.
As shown in FIG. 4, the claw 45 is formed in a shape in which the horizontal hole 44 is closed in a state where the claw 45 is positioned at the clamp position, that is, in a state where the claw 45 protrudes from the locate pin 5 through the horizontal hole 44.

<Cam configuration>
The cam 47 constitutes a part of the cam mechanism 51 that oscillates the clamp arm 4 by converting the reciprocating motion into a swing motion, and is constituted by a through hole that penetrates the clamp arm 4. The direction in which the through hole penetrates the clamp arm 4 is a direction parallel to the axial direction of the first connecting pin 27.
The opening shape of the cam 47 (through hole) is a long hole shape having a linear portion 47a extending in the front-rear direction and an inclined portion 47b extending inclined from the rear end of the linear portion 47a, and the fixing pin 41 moves. It is a shape that fits freely.

  The fixing pin 41 constitutes a cam follower that engages with the cam 47. The fixing pin 41 is formed in a columnar shape. As shown in FIG. 6, the fixing pin 41 is passed through the cam 47, the long hole 39 of the cylindrical body 32, and the pin hole 52 of the housing 8. It is fixed to. That is, the cam mechanism 51 according to this embodiment is fixed by the cam 47, the long hole 39 of the cylindrical body 32, and the fixing pin 41.

The cam 47 moves forward or backward relative to the fixed pin 41 as the piston rod 16 moves forward or backward.
As shown in FIG. 1, the direction in which the inclined portion 47 b of the cam 47 is inclined is such that the clamp arm 4 swings in the retracting direction of the claw 45 (counterclockwise in FIG. 1) around the connecting pin 27 when moving forward. Direction. FIG. 1 is drawn with the fixing pin 41 fitted in the front end portion of the straight portion 47 a of the cam 47. The pin clamp device 1 according to this embodiment is configured such that the claw 45 is positioned at the clamp position in this state.

When the clamp arm 4 moves forward together with the piston rod 16 from this state and the fixing pin 41 engages with the inclined portion 47b of the cam 47, as shown in FIG. Is pushed in the opposite direction, and the claw 45 is positioned at the retracted position.
That is, the cam 47 moves the clamp arm 4 in the direction of the locating pin 5 by moving the clamp arm 4 in the direction in which the locating pin 5 protrudes from the workpiece contact member 3 (front direction and “first direction” in the present invention). And the claw 45 protrudes from the locating pin 5 when the clamp arm 4 moves rearward (second direction opposite to the first direction).

<Description of operation>
In order to hold the two plate-like components 2 using the pin clamp device 1 configured as described above, the state shown in FIG. 2 is performed. The state shown in FIG. 2 is a state in which the locate pin 5 moves forward and the claw 45 is accommodated in the locate pin 5. In this state, the pin clamp device 1 is brought close to the plate-like component 2, and the guide portion 5 a of the locate pin 5 is inserted into the through hole 2 a of the plate-like component 2. The movement of the pin clamp device 1 at this time is performed by a robot (not shown). Then, the pin clamp device 1 is advanced relative to the plate-like component 2 until the plate-like component 2 comes into contact with the workpiece contact member 3.

  Next, the piston 15 of the cylinder 13 is retracted. Thus, when the piston 15 moves backward, the movable pin 31 and the clamp arm 4 move together, and the cam 47 moves backward with respect to the fixed pin 41. At the initial stage of the reverse stroke, the inclined portion 47b of the cam 47 is pushed by the fixing pin 41 in the protruding direction of the claw 45, whereby the clamp arm 4 swings clockwise in FIG. Protruding. When the contact point between the fixing pin 41 and the cam 47 reaches the front end of the inclined portion 47b, the claw 45 is positioned at the clamp position. In this state, when the piston 15 is further retracted, the claw 45 at the clamp position hits the plate-like component 2 and presses the plate-like component 2 against the workpiece contact member 3 as shown in FIG. The magnitude of the pressing force at this time is equivalent to the air pressure applied to the piston 15. When the claw 45 pushes the plate-like component 2 in this manner, the two plate-like components 2 are held between the claw 45 and the workpiece contact member 3 so as to overlap each other.

  These plate-like components 2 are welded to each other by, for example, spot welding while being held by the pin clamp device 1 in this manner. During spot welding, spatter is scattered and adheres to parts located near the plate-like part 2. At this time, since the lateral hole 44 of the locate pin 5 is blocked by the claw 45, the lateral hole 44 is not sputtered during spot welding. After welding is completed, the piston 15 is advanced. As the piston 15 moves forward in this way, the movable pin 31 and the clamp arm 4 move forward together. At the initial stage of the forward travel, the clamp arm 4 does not swing because the contact point between the cam 47 and the fixing pin 41 is at the straight portion 47a. For this reason, the locating pin 5 and the clamp arm 4 move forward in a state where the lateral hole 44 is closed by the claw 45, and the claw 45 is moved forward from the plate-like component 2.

  On the other hand, at this time, the cylindrical body 32 of the movable pin 31 approaches the workpiece contact member 3, and the annular space S formed between the cylindrical body 32 and the workpiece contact member 3 is gradually narrowed. In this case, since the connecting portion 5c of the cylindrical body 32 and the locating pin 5 substantially functions as the piston 15, the air in the annular space S is compressed. For this reason, a positive pressure is applied between the workpiece contact member 3 and the movable pin 31.

  Thereafter, the locating pin 5 and the clamp arm 4 further advance, so that the fixing pin 41 engages with the inclined portion 47b of the cam 47, and the clamp arm 4 swings counterclockwise in FIG. As shown in FIG. 2, the forward movement is restricted by the cylindrical body 32 coming into contact with the workpiece contact member 3, and the claw 45 is positioned at the retracted position. Thus, the plate-shaped component 2 is released by the pin clamp device 1 retreating with respect to the plate-shaped component 2 with the claw 45 positioned at the retracted position.

<Explanation of effect by embodiment>
According to the pin clamp device 1 configured in this way, the locating pin 5 and the clamp arm 4 can be driven by one cylinder 13 to hold or release the plate-like component 2. For this reason, the manufacturing cost of this pin clamp apparatus 1 can be kept low compared with the pin clamp apparatus which uses two cylinders.

Further, since the space between the cylindrical body 32 of the movable pin 31 and the main body portion 11 of the housing 8 is sealed by the ring 37, spatter powder and other fine particles are introduced into the apparatus from between the workpiece contact member 3 and the locate pin 5. Even if foreign matter enters, these intrusions do not adhere to sliding parts such as the piston rod 16 and the cam 47 of the cam mechanism 51.
Therefore, according to this embodiment, it is possible to use only one cylinder 13 and to prevent foreign matters from adhering to the sliding parts such as the piston rod 16 and the cam 47. It is possible to provide a pin clamp device with high operation reliability at a low price.

  The nail | claw 45 by this embodiment is formed in the shape by which the horizontal hole 44 is obstruct | occluded in the state which protruded from the locate pin 5 through the horizontal hole 44 of the locate pin 5. FIG. For this reason, the spatter scattered during spot welding does not enter the lateral hole 44. Therefore, according to this embodiment, it is possible to provide a pin clamp device in which the operation reliability is further improved.

  Further, according to this embodiment, since the shaft portion 5b of the locate pin 5 is fitted in the through hole 6 of the workpiece contact member 3, the sputter dust or the like is applied to the workpiece contact member 3 adjacent to the plate-like component 2. Other fine foreign matters are more difficult to enter the apparatus.

  It is desirable that the locate pin 5 is formed of a material that hardly adheres to the spatter so as to make it difficult for spatter to adhere, or a surface treatment that makes it difficult for spatter to adhere. Materials that are difficult to deposit sputter are generally expensive. In this embodiment, since the movable pin 31 is divided into the cylindrical body 32 and the locate pin 5, the entire movable pin 31 is formed of a material that is difficult to be sputtered, or the entire surface of the movable pin 31 is the above-described surface. Compared with the case where the treatment is performed, it is possible to reduce the amount of the expensive material to which the sputtering is difficult to adhere, and to reduce the size of the member for performing the surface treatment to which the sputtering is difficult to adhere. For this reason, manufacturing cost becomes still lower.

  In addition, since the ring 37 functions as a component for preventing the second connecting pin 33 from coming off, a part for preventing the second connecting pin 33 from coming off is unnecessary. For this reason, the number of parts is reduced, the manufacturing cost is further reduced, and the assembly is facilitated.

  In this embodiment, the locating pin 5 and the claw 45 move to the opposite side (front side) of the cylinder 13 with respect to the workpiece abutting member 3 in the process of releasing the workpiece after spot welding. Even if a gap is formed between the horizontal hole 44 and the sputter powder or other fine foreign matter, it is difficult to enter the gap. Moreover, since the cylindrical part (cylindrical body 32 and the connection part 5c) of the movable pin 31 becomes a piston substantially, the air in the space S between the workpiece | work contact member 3 and a cylindrical part is compressed. A positive pressure is applied between the contact member 3 and the movable pin 31. For this reason, even if the sealing member 9 that seals between the workpiece contact member 3 and the shaft portion 5b of the locating pin 5 is worn and the sealing performance is deteriorated, spatter powder and other fine foreign matters Intrusion can be prevented.

  DESCRIPTION OF SYMBOLS 1 ... Pin clamp apparatus, 3 ... Work contact member (work contact part), 4 ... Clamp arm, 5 ... Locate pin, 5b ... Shaft part, 5c ... Connection part, 5d ... Hollow part, 6 ... Through-hole, 8 ... Housing, 13 ... Cylinder, 16 ... Piston rod, 31 ... Movable pin, 32 ... Cylindrical body (cylindrical part), 33 ... Second connecting pin (connecting pin), 37 ... Ring, 39 ... Slot, 41 ... Fixed Pin (pin), 44 ... side hole, 45 ... claw, 47 ... cam, 51 ... cam mechanism.

Claims (4)

A cylindrical housing;
A workpiece contact portion provided at one end of the housing;
A cylinder having a piston rod provided at the other end of the housing and reciprocating in a direction parallel to the center line of the housing;
A hollow locating pin that protrudes from the workpiece contact portion is provided on one end side of the cylindrical portion that is movably fitted to the inner peripheral portion of the housing, and the other end portion is connected to the piston rod. A movable pin,
A claw that is disposed inside the movable pin in a state of being swingably connected to the piston rod, and is provided at one end through the lateral hole of the locate pin as it swings and enters and exits the hollow portion of the locate pin. A clamp arm,
A cam mechanism located inside the movable pin, comprising a cam mechanism for converting the reciprocating motion of the piston rod into a swing motion and swinging the clamp arm with respect to the movable pin;
A ring having a function of a bearing that slides on an inner peripheral surface of the housing and a function of sealing between the housing and the cylindrical portion is provided on an outer peripheral portion of the cylindrical portion of the movable pin. Pin clamp device. The pin clamp device according to claim 1,
The pin claw device is characterized in that the claw is formed in a shape that closes the lateral hole in a state of protruding from the locate pin through the lateral hole. The pin clamp device according to claim 1 or 2,
The work contact portion has a through hole through which the locate pin passes.
The movable pin is
A cylindrical body that constitutes the tubular portion and is coupled to the piston rod;
The locating pin has a shaft portion that is slidably fitted into the through hole and has a connecting portion that is fitted to the inner peripheral portion of the cylindrical body.
The connecting portion is fixed to the cylindrical body via a plurality of connecting pins extending in the radial direction of the cylindrical body,
The pin clamp device, wherein movement of the connecting pin to the outside in the radial direction is restricted by the ring. In the pin clamp device according to any one of claims 1 to 3,
The cam mechanism is
A cam comprising a through hole formed in the clamp arm;
An elongated hole extending in parallel with the center line in a state of passing through the cylindrical portion of the movable pin in the radial direction;
A pin that extends in the radial direction of the housing and passes through the elongated hole and the cam and has both end portions fixed to the housing and constituting a cam follower;
The cam
When the clamp arm moves in a first direction in which the locate pin protrudes from the workpiece contact portion, the claw is accommodated in the locate pin, and the clamp in the second direction opposite to the first direction. A pin clamp device in which the claw is formed in a shape protruding from the locate pin as the arm moves.

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