JP2006346769A - Workpiece gripper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece gripper which can positively grip a workpiece without causing deformation or damage on the workpiece, and facilitates grip and release of the workpiece even in a narrow space. <P>SOLUTION: The gripper 1 functions to grip an electric wire by a pair of pressing means 2, 3 which are each formed of a plurality of pressing pieces 10 each formed like a flake and laminated on each other. Each pressing piece 10 has a base portion connected to an interval varying mechanism 30 for linearly varying an interval between the pairing pressing means 2, 3; an arm portion extending from the base portion and being elastically deformable at the time of gripping the electric wire; and a head portion extending from an end of the arm portion, opposite to the base portion, and gripping the electric wire by pressing the same in a pressing direction orthogonal to a longitudinal direction of the arm portion. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a workpiece clamping device, and more particularly to a workpiece clamping device suitable for clamping a wire.

  2. Description of the Related Art Conventionally, workpiece clamping devices that clamp articles are used in parts assembly, processing, sorting, boxing, and the like. For example, in a terminal crimping device that attaches a crimp terminal to the tip of an electric wire, when removing the coating material at the end of the wire, or for attaching the crimp terminal to the tip of the wire, the tip of the wire from which the coating material has been removed An electric wire holding device is used to hold the electric wire when inserting the wire into the crushing member.

  As illustrated in FIG. 8, the electric wire clamping apparatus 100 includes a pair of pressing units 101 and 102 that sandwich the electric wire L, and a grip movable mechanism (not shown) that rotates the respective pressing units 101 and 102. . In other words, when the grip moving mechanism is operated, the pressing means 101 disposed on the right side of the paper rotates counterclockwise about the shaft 103, and the pressing means 102 disposed on the left side of the paper is centered on the shaft 104. Rotate clockwise. Thereby, the electric wire L is hold | maintained in the state pinched | interposed into contact surface 105,106 of each press means 101,102. Here, a plurality of grooves 107 and 108 are formed in the contact surfaces 105 and 106, and the sliding of the electric wire L is prevented by increasing the frictional resistance. 8A is a front view of the electric wire clamping device 100, and FIG. 8B is a perspective view of the electric wire clamping device 100. FIG.

  In the above-described electric wire clamping apparatus 100, the groove portion 105 can prevent the electric wire L from slipping to some extent. However, for example, when removing the covering material of the electric wire L, a large holding force is required, so that the grip is movable. The clamping force by the mechanism had to be greatly increased. However, when the electric wire L is clamped with a large tightening force, the electric wire L may be deformed or the covering material may be damaged. Further, when the diameter of the electric wire L is different, it is necessary to adjust the holding force again.

  For this reason, the applicant of the present invention has a pair of pressing means including a pressing group in which thin plate-like pressing pieces are stacked and an elastic means that biases each pressing piece in the pressing direction (striated wire). (Patent Document 1). According to this, since the front end surface of the pressing group can be deformed along the shape of the electric wire, the contact area with the wire rod increases, and the wire rod can be securely held, and the wire rod It is possible to prevent deformation and damage of the material.

JP 2000-343164 A

  However, in the above-described apparatus, a certain amount of space is required around the work in order to rotate the pair of pressing means. Further, in the apparatus using the laminated thin plate-like pressing group, since the elastic means is arranged behind the pressing piece in order to bias in the pressing direction, the size of the pressing means in the pressing direction should be reduced. I could not. Therefore, in a narrow space, there is a problem that the operation of sandwiching and releasing the work cannot be performed.

  Therefore, in view of the above situation, the present invention has an object to provide a workpiece clamping device that can clamp a workpiece without deformation or damage, and can clamp and release the workpiece even in a narrow space. It is.

  In order to solve the above-described problem, the workpiece clamping device according to the present invention is “a workpiece clamping device that clamps a workpiece by a pair of pressing means, and each of the pressing means is formed in a thin plate shape and stacked. Each of the pressing pieces includes a base portion connected to an interval variable means for linearly changing an interval between the pair of pressing means, and extends from the base portion, and the workpiece An arm portion that is elastically deformable when sandwiching the arm portion, and an end portion of the arm portion that faces the end portion on the base side, and extends in a pressing direction perpendicular to the longitudinal direction of the arm portion. And a pressing head ”.

  The pressing means are provided as a pair and opposed to each other, and the distance between both means is linearly changed by the interval varying means, thereby holding and releasing the workpiece. That is, the work is sandwiched when both means approach each other, the work is sandwiched by maintaining the state, and the work that has been sandwiched is released when both means are separated. Here, even if a space | interval variable means displaces a pair of press means together, it may displace only any one, The structure is not specifically limited. For example, a motor driving force is converted into a linear motion of the pressing means by a rack and pinion mechanism, and a piston is linearly moved by supplying compressed air and the pressing means is interlocked with this motion.

  The pressing piece is formed in a thin plate shape by an elastic material such as metal, and a base portion is formed at one end portion, a head portion is formed at the other end portion, and an arm portion is formed at the middle. The base is fixed to the variable interval means by screwing or fusion. The arm portion is formed to extend from the base portion, and has a certain length. Thus, the arm part formed thin and long by the elastic body can be bent like a fishing rod, for example, with respect to the load on the tip. The degree of bending, that is, the ease of elastic deformation, can be appropriately changed by selecting the material forming the pressing piece and setting the thickness, length, shape, etc. of the arm. The head is a portion that presses the workpiece, and is in contact with the workpiece on the side surface in the thickness direction of the pressing piece and on the side surface facing the other pressing means.

  Therefore, according to the workpiece clamping device of the present invention, when the workpiece is clamped by the pair of pressing means and the pressing force is increased in a state where the side surface in the thickness direction of the pressing piece is in contact with the workpiece, each pressing piece is an arm portion. Therefore, it is displaced in the direction opposite to the pressing direction. At this time, since each pressing piece can be separately displaced, the side surfaces of the stacked pressing pieces come into contact with the workpiece so as to follow the shape of the workpiece. In other words, the workpiece can be clamped regardless of the shape of the workpiece, or when the workpiece is a wire, regardless of its diameter. Moreover, since the contact area with a workpiece | work increases by contact | abutting so that the side surface of a some press piece may follow the shape of a workpiece | work, it becomes possible to clamp a workpiece | work reliably with small force.

  Furthermore, since each pressing piece is displaced in a direction opposite to the pressing direction due to elastic deformation of the arm portion, even if the workpiece is sandwiched with a strong force by a pair of pressing means, the force is directly applied to the workpiece. It will not take. In other words, the workpiece is less likely to be deformed or damaged, and when the workpiece is weak and easily damaged, or is an electronic component that is susceptible to internal functions due to impact, or a soft material. Even a workpiece such as a coated wire can be sandwiched without damaging the workpiece.

  In addition, since the distance between the pair of pressing means changes linearly regardless of the rotational movement and has an arm portion formed to a certain length, it is required around the workpiece to be sandwiched. The space becomes small. Furthermore, since the arm portion that is elastically deformed when the workpiece is clamped is provided so as to extend in a direction orthogonal to the pressing direction, the size of the pressing means in the pressing direction can be reduced. As a result, the workpiece can be sandwiched in a narrow space, and the sandwiched workpiece can be opened in the narrow space.

  In addition to the above-described configuration, the workpiece clamping device according to the present invention may be configured such that “each of the pressing means is disposed at both ends of the stacked pressing pieces, and directly or via the pressing pieces with the interval varying means. A pair of support plates connected to each other, a long hole bored in the head of each of the pressing pieces, the longitudinal direction of which coincides with the pressing direction, and a pair of the supporting plates fixed to the long plate. A core shaft penetrating through the hole portion, and the core shaft is in contact with each of the pressing pieces by contact with an end portion of the elongated hole portion in the opposite pressing direction opposite to the pressing direction. In addition, in the initial state before clamping the workpiece, an initial displacement displaced in the counter-pressing direction is applied in advance, and each of the pressing pieces is brought into contact with the end of the elongated hole in the pressing direction. It defines the maximum displacement that can be displaced.

  A pair of support plates are provided, and are arranged on both outer sides of the pressing pieces in a state where a plurality of support plates are stacked. Moreover, the long hole part is perforate | pierced in the same position in the head of each press piece, The longitudinal direction corresponds with the press direction. Then, the core shaft is inserted so as to penetrate the long hole portions of the plurality of stacked pressing pieces. One end of the core shaft is fixed to one support plate, and after passing through the plurality of pressing pieces, the other end is fixed to the other support plate. Even if the core shaft is fixed to the support plate by fusion or the like, the core shaft may be fixed detachably by inserting the core shaft into a hole formed in the support plate. Good. Further, when the core shaft is inserted into the hole portion of the support plate, even if the core shaft is a screw member and is fixed using a screw receiving member such as a nut, the hole portion of one support plate is a screw hole, It may be fixed by screwing.

  The positional relationship between the core shaft and the long hole portion is determined by slightly displacing each pressing piece in a direction opposite to the pressing direction (counter pressing direction) in the initial state where no workpiece is sandwiched. It is set so that it can be inserted. Thereby, in the initial state, each pressing piece has already been displaced in the counter-pressing direction, that is, a state in which an initial displacement is given. At this time, the core shaft is in contact with the end of the long hole portion in the counter-pressing direction. The magnitude of the initial displacement can be set as appropriate according to the workpiece to be clamped, and the position of the core shaft fixed to the support plate increases as the distance from the end in the counter-pressing direction of the long hole portion increases. .

  In addition, since the longitudinal direction of the long hole portion coincides with the pressing direction, when each pressing piece is displaced in the anti-pressing direction as the workpiece is sandwiched, the core shaft is inserted into the long hole portion, In addition, the inside of the long hole portion moves in the pressing direction from the end portion in the counter pressing direction. That is, each pressing piece can be displaced by the length of the long hole. When each pressing piece is displaced to the maximum in the counter-pressing direction, the core shaft is in contact with the end portion in the pressing direction of the long hole portion.

Therefore, according to the workpiece clamping device of the present invention, the initial displacement is already given to each pressing piece in the initial state where no workpiece is clamped. When sandwiching an object by a spring, if the spring constant is constant, the load applied to the object is proportional to the displacement of the spring, and this relationship can be expressed as W = K × (δ ₀ + δ). Here, W is a load, that is, a force for gripping an object (kgf), δ ₀ is an initial displacement (mm), δ is a displacement (mm) due to clamping a workpiece, and K is a spring constant (kgf / mm). It is. That is, taking a wire as an example, if the material forming the pressing piece is the same (K is the same), when a wire with a diameter of δ mm is sandwiched when no initial displacement is applied (when δ ₀ = 0) When the initial displacement δ ₀ is applied, the grip force exerted on the can be exerted when a wire rod having a diameter δ−δ ₀ mm, which is smaller in diameter, is sandwiched. Therefore, by applying an initial displacement to each pressing piece in advance, even a thin wire or a minute workpiece can be clamped with the same gripping force as when a thicker wire or a larger workpiece is clamped. As a result, even a thin wire or a minute work can be securely clamped.

  Moreover, since each pressing piece cannot be displaced beyond the length of the long hole, the length of the long hole is set in consideration of the elastically deformable range of the pressing piece, thereby exceeding the limit of elastic deformation. Each pressing piece is not displaced. In other words, when pressing a workpiece larger than the original workpiece to be clamped or when a foreign object other than the workpiece is accidentally pinched by the clamping device, each pressing piece is displaced beyond the elastic deformation limit. It can be prevented from being damaged.

  Furthermore, in addition to the above-described configuration, the work clamping apparatus according to the present invention “the arm is gradually tapered from the end on the base side toward the end on the head side” Can be.

  In the case of a thin plate spring having a rectangular cross section, the displacement is inversely proportional to the plate width. That is, the pressing piece in which the arm portion is formed thinner toward the tip end is more likely to be displaced (easily bent) toward the tip end.

  Therefore, according to the workpiece clamping device of the present invention, since the arm portion is easily bent at the end portion on the head side, the head of each pressing piece is easily displaced in the opposite pressing direction when the workpiece is clamped. Thus, when the work is sandwiched between the pair of pressing means with a strong force, the above-described effect that the deformation and damage of the work can be prevented without exerting the force directly on the work can be more effectively exhibited. It will be a thing.

  In addition to the above-described configuration, the workpiece clamping apparatus according to the present invention may be configured such that “the pressing side surface that comes into contact with and presses against the workpiece is in an initial state before clamping the workpiece toward the tip. It can also be assumed that it is “inclined in the pressing direction”.

  The pressing side surface is a side surface in which each pressing piece comes into contact with the workpiece when the workpiece is clamped, and the head of the pressing piece belonging to one pressing means and the head of the pressing piece belonging to the other pressing means face each other. It is the side to do. Since each pressing side surface is inclined in the pressing direction toward the distal end, the pressing side surfaces of the pressing pieces belonging to the opposing pressing means are not parallel in the initial state, and the distance between them is narrower toward the distal end. . Here, when an object is sandwiched between a pair of surfaces, such as tweezers and tongs, if the distance between the pair of surfaces is open toward the tip, the sandwiched object is likely to escape toward the tip. That is, assuming that the pressing side surfaces of the opposing pressing means are parallel in the initial state, when the workpiece is sandwiched and pressed, each pressing piece is displaced in the anti-pressing direction, so that the distance between the pressing side surfaces is at the tip. The workpiece that is about to be clamped becomes easier to escape toward the tip.

  Therefore, according to the workpiece clamping device of the present invention, the pressing side surface of each pressing piece is formed so as to incline in the pressing direction toward the tip, so that when pressing the workpiece, The degree to which the distance between the side surfaces opens outward is reduced. Thus, while maintaining the effect of holding the workpiece without damaging the workpiece by the elastic deformation of each pressing piece, it is possible to prevent the workpiece from being caught and to securely hold the workpiece.

  In addition, the work clamping apparatus according to the present invention may be configured such that, in addition to the above-described configuration, the pair of pressing means has end portions that press the work tapered toward the tip. .

  That is, the head of each pressing piece is tapered toward the tip. Moreover, when a support plate is arrange | positioned at the both sides of the laminated | stacked pressing piece, a support plate is also formed in a taper as the front-end | tip.

  Therefore, according to the workpiece clamping device of the present invention, the structure of the head for clamping the workpiece and the vicinity thereof are formed so as to be narrower toward the tip, so that the workpiece is clamped in a narrow space and the clamped workpiece is released. The above-mentioned effect of being able to be achieved can be exhibited more.

  As described above, as an effect of the present invention, by pressing a workpiece by laminating a plurality of elastically deformable pressing pieces, the workpiece can be securely held without being deformed or damaged. Further, since the arm portion that is elastically deformed when the workpiece is clamped extends in a direction orthogonal to the pressing direction, it is possible to perform an operation of clamping and releasing the workpiece in a narrow space.

  Hereinafter, a workpiece clamping device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7. In this embodiment, the case where an electric wire is clamped about the workpiece clamping apparatus incorporated in the terminal crimping apparatus is illustrated. Here, FIG. 1 is a perspective view showing the configuration of the terminal crimping apparatus in which the workpiece clamping device is incorporated, FIGS. 2 and 3 are explanatory diagrams for explaining the operation of the terminal crimping device, and FIG. 4 is the configuration of the workpiece clamping device. FIG. 5 is an exploded perspective view showing the configuration of the pressing unit, FIG. 6 is an explanatory diagram showing the configuration of the pressing unit, and FIG. 7 is an explanatory diagram for explaining the operation of the pressing unit.

  The terminal crimping apparatus A in which the workpiece clamping device 1 (hereinafter referred to as “the clamping device 1”) of the present embodiment is incorporated is a method of feeding the wire L, removing the covering material, crushing the crimp terminal, and cutting the wire L. As a series of operations, the electric wire L having a predetermined length with crimp terminals crimped to both ends is continuously manufactured. As shown in FIG. 1, the terminal crimping apparatus A includes a first crimping machine main body 50 that crimps a crimping terminal to the front end side of the electric wire L, and a second crimping machine main body that crimps the crimping terminal to the rear end side of the electric wire L. 60, a wire feeding mechanism 70 for feeding the distal end side of the electric wire L to the first crimping machine main body 50, a cutting mechanism 80 for cutting the electric wire L and removing the covering material at the end of the electric wire L, and the electric wire L after being cut And a chuck mechanism 90 that feeds the rear end side of the electric wire L to the second crimping machine main body 60. The clamping device 1 of the present invention is incorporated in the chuck mechanism 90.

  Hereinafter, the configuration and operation of each unit will be briefly described. The first crimping machine main body 50 and the second crimping machine main body 60 have the same basic configuration, and a detailed description of the second crimping machine main body 60 will be omitted. The first crimping machine main body 50 includes a support member 51, a guide member 52 that moves up and down by an operation of a power mechanism (not shown), and a base 53 that is positioned below the support member 51.

  A crushing member 56 is attached to the guide member 52 via an adjustment mechanism (not shown) and a pressure sensor 55. The crushing member 56 is disposed so as to protrude from the lower end of the guide member 52, and the protruding length can be adjusted by an adjusting mechanism. The crushing member 56 moves up and down integrally with the guide member 52.

  A concave anvil 54 is formed on the upper surface of the base 53. Therefore, when the electric motor is driven in a state where the crimp terminal is supplied to the anvil 54 of the base 53, the crushing member 56 moves downward together with the guide member 52, and the tip of the crushing member 56 and the base 53 are formed. The anvil 54 meshes with each other to crush the crimp terminal.

  Further, the first crimping machine main body 50 includes terminal conveying means (not shown) for sequentially supplying the crimp terminals to the anvil 54 of the base 53. The terminal conveying means moves the crimp terminals connected in series along the guide member, and is interlocked with the operation of the crushing member 56.

  As shown in FIG. 2 or 3, the wire feeding mechanism 70 is provided with a wire take-in guide 71, a rotating body 72, and a guide pipe 73 on a circular plate 74. The rotating body 72 is driven by a motor (not shown), and can measure and send the wire L by controlling the rotation direction and the number of rotations. The electric wire L taken in via the electric wire take-in guide 71 is sent into the guide pipe 73 by the two rotating bodies 72 and further guided to the tip of the guide pipe 73. A cutting mechanism 80 is disposed in the distal direction of the guide pipe 73. When the electric wire L is fed from the rotating body 72, the tip of the electric wire L is inserted between the upper blade and the lower blade of the cutting mechanism 80. (Arrow A in FIG. 2).

  Further, the circular plate 74 of the electric wire feeding mechanism 70 is rotated within a predetermined angle by a rotating means (not shown) having a motor or the like. That is, when the circular plate 74 is rotated by the rotating means, the tip position of the guide pipe 73 is displaced (arrow B in FIG. 2), and the tip of the guide pipe 73 faces the anvil 54 of the first crimping machine main body 50. In this state, when the electric wire L is fed by the rotating body 72, the tip of the electric wire L is inserted into a predetermined portion of the crimp terminal placed on the anvil 54 (arrow C in FIG. 2).

  The cutting mechanism 80 is for cutting the electric wire L and removing the covering material at the end of the electric wire L. The cutting mechanism 80 is a pair of blades (upper blade / lower blade) arranged in the vertical direction and the upper blade is used as the lower blade. Moving means (not shown) for moving up and down. That is, in a state where the electric wire L is inserted between the upper blade and the lower blade, the electric wire L is cut by operating the moving means so that the upper blade contacts the lower blade. In addition, with the wire L inserted between the upper blade and the lower blade so that the end of the wire L protrudes a predetermined length, the distance between the upper blade and the lower blade is the size of the core wire of the wire L. The moving means is operated so as to have a corresponding distance, and then the electric wire L is pulled by the electric wire feeding mechanism 70 or the chuck mechanism 90, whereby the covering material at the end of the electric wire L is removed.

  The chuck mechanism 90 is disposed on the rear side of the cutting mechanism 80 and includes the clamping device 1, a moving unit 92, and a feeding unit 93. The clamping device 1 is attached to the tip of the feeding means 93 and holds the electric wire L in a sandwiched state. The detailed configuration of the clamping device 1 will be described later. The moving means 92 rotates the clamping device 1 and the feeding means 93 within a predetermined range so that the clamping device 1 draws an arc, and the electric wire L is held in a state where the electric wire L is held by the clamping device 1. The rear end side can be moved from the cutting mechanism 80 side to the second crimping machine main body 60 side (arrow D in FIG. 3). The feeding means 93 moves the clamping device 1 in the front-rear direction, and feeds the rear end side of the electric wire L to a predetermined portion of the crimping terminal placed on the anvil of the second crimping machine body 60. Together with (arrow E in FIG. 3), after the crimp terminal is crushed, the electric wire L with the crimp terminal crimped is discharged from the anvil. In addition, these clamping apparatus 1, the moving means 92, and the sending-in means 93 are driven by supply of compressed air.

  Next, the structure of the clamping apparatus 1 is demonstrated based on FIG. The clamping device 1 includes a gap variable mechanism 30 and a pair of pressing means 2 and 3. The interval variable mechanism 30 operates the pressing means 2 and 3 to change the interval between them, and includes a linear linear guide 31 and two sliding members 32 that are guided by the linear guide 31 and slide. 33, two piston parts 42 and 43 which operate by supplying compressed air, piston rods 42p and 43p, and a connecting member 45. The piston portion 42 is provided with supply ports 42a and 42b for supplying compressed air from the outside, and the piston portion 43 is similarly provided with supply ports 43a and 43b. The piston rods 42p and 43p are connected to the sliding members 32 and 33 via the connecting member 45, respectively. With this configuration, when compressed air is supplied from the supply port 42b to the piston portion 42, the piston rod 42p is pushed out of the piston portion 42, and the sliding member 32 connected to the piston rod 42p via the connecting member 45 is It slides on the linear guide 31 so as to approach the other sliding member 33. Conversely, when compressed air is supplied from the supply port 42 a to the piston portion 42, the piston rod 42 p operates so as to be inserted into the piston portion 42, and the sliding member 32 moves away from the sliding member 33 accordingly. To slide. Since the other piston part 43 and piston rod 43p operate in the same manner by supplying compressed air from the supply ports 43a and 43b, the distance between the sliding members 32 and 33 changes accordingly. Here, the interval variable mechanism 30 having the above-described configurations corresponds to the interval variable means of the present invention.

  As shown in FIG. 5, the pressing means 2 includes a pair of support plates 20 and a plurality of pressing pieces 10 stacked between them. Each pressing piece 10 is a metal plate formed in a thin plate shape, and as shown in FIG. 6A, the arm portion 12 having a length of several centimeters and a front surface formed from one end thereof. It has a substantially rectangular base 11 and a head 13 formed at the other end. Further, the arm portion 12 is formed so that the plate width becomes narrower from the end portion on the base portion 11 side toward the end portion on the head portion 13 side.

  The head 13 is formed to protrude so as to form an L shape with the arm 12, and the side surface in the thickness direction on the protruding side is a pressing side surface 14 that comes into contact with the electric wire when the electric wire is held. The pressing side surface 14 presses the electric wire in a direction (pressing direction) orthogonal to the longitudinal direction of the arm portion 12. The pressing side surface 14 is inclined in the pressing direction toward the tip (corresponding to an angle θ in FIG. 6A). In addition, each pressing piece and the pair of support plates are formed to be inclined toward the tip so that the corner of the tip of the head 13 on the side opposite to the pressing direction is chamfered. Tapering towards. Each pressing side surface 14 is formed with a plurality of small convex portions (not shown).

  As shown in FIG. 5, the support plate 20 is a member for supporting the plurality of pressing pieces 10 in a stacked state, and is disposed at both ends of the stacked pressing pieces 10. As shown in FIG. 6B, the size and shape of the support plate 20 are approximately the same as the pressing piece 10, and when the supporting plate 20 is overlapped with the pressing piece 10, the base 11 and the arm 12. The support plate base 21, the support plate arm 22, and the support plate head 23 are formed in the portions that respectively contact the head 13. The thickness of the support plate 20 is set to be considerably thicker than the thickness of the pressing piece 10.

  Further, the head 13 of each pressing piece 10 is provided with a long hole portion 15 in which the pressing direction coincides with the longitudinal direction, and the support plate head 23 of the support plate 20 has a circular circular hole 25. It has been drilled. Then, as shown in FIG. 5, the core shaft 5 has a circular hole portion 25 of one support plate 20, a long hole portion 15 of each stacked pressing piece 10, and a circular hole portion 25 of the other support plate 20. Are sequentially inserted, whereby the support plate 20 and each pressing piece 10 are connected to form one pressing means 2. In addition, the pressing piece 10 and the support plate 20 that are formed symmetrically with respect to the longitudinal direction of the arm portion 12 are connected by the core shaft 5 in the same manner as described above. The other pressing means 3 is configured. The core shaft 5 connecting the pair of support plates 20 and the plurality of pressing pieces 10 and penetrating the pressing means 2 (3) is formed in a screw shape and is fastened by a nut (not shown). . Further, holes 19 and 29 are formed in the base 11 and the support plate base 21, respectively, and are fastened to the sliding member 32 (33) by screws (not shown) inserted therethrough. Accordingly, the pair of pressing means 2 and 3 are fixed to the sliding members 32 and 33, respectively, and the distance between the pressing means 2 and 3 is changed in conjunction with the linear motion of the sliding members 32 and 33. .

  Here, the positional relationship between the circular hole portion 25 of the support plate 20 and the long hole portion 15 of the pressing piece 10 is such that the pressing piece 10 and the supporting plate 20 are overlapped as shown in FIG. The center point of the circular hole 25 is set to be on the side opposite to the pressing direction than the end of the long hole 15 in the counter pressing direction. That is, in order to insert the core shaft 5 inserted through the circular hole portion 25 into the long hole portion 15, each pressing piece 10 must be slightly displaced in the counter-pressing direction. Thereby, in the initial state where the electric wire L is not yet clamped, the initial displacement is applied to each pressing piece 10 in the anti-pressing direction in advance. At this time, the core shaft 5 is in contact with the inner surface of the end portion of the long hole portion 15 in the counter-pressing direction.

  Next, the holding | maintenance operation | movement of the electric wire L by the clamping apparatus 1 is demonstrated based on FIG.4 and FIG.7. When the electric wire L is sent to the clamping device 1 and an instruction signal for holding the electric wire L is transmitted from the operation control means (not shown), compressed air is sent from the supply ports 42b and 43b to the piston portions 42 and 43, respectively. The piston rods 42p and 43p operate so as to be pushed out from the piston portions 42 and 43, respectively. As a result, the sliding members 32 and 33 connected to the piston rods 42 p and 43 p slide along the linear guide 31.

  As a result, the pair of pressing means 2 and 3 connected to the sliding members 32 and 33 linearly approach each other, and the pressing side surface 14 of the pressing piece 10 belonging to each pressing means 2 and 3 contacts the electric wire L. . In this way, the distance between the pair of pressing means 2 and 3 changes linearly regardless of the rotational motion, and extends in a direction orthogonal to the pressing direction, and is formed to a certain length. Since the electric wire L is pinched by the pressing piece 10 having 12, the space required around the head 13 of the pressing piece 10 is small for this operation. Therefore, the clamping device 1 can be operated in a narrow space, and the electric wire L can be clamped.

  Thereafter, when a load is applied to the electric wire L so that the pair of pressing means 2 and 3 are further approached, the pressing pieces 10 are elastically deformed in the arm portion 12. At that time, since the pressing side surface 14 is formed so as to be inclined in the pressing direction toward the tip, even if each pressing piece 10 is displaced in the anti-pressing direction due to the pinching of the electric wire L, the opposing pressing side 14 is at the tip. Opening degree is small. Therefore, it becomes difficult for the electric wire L to escape in the distal direction, and the electric wire L can be securely held.

  At this time, since each pressing piece 10 is separately displaced in the counter-pressing direction with the load on the electric wire L, the pressing side surface 14 of each pressing piece 10 follows the shape of the electric wire L as shown in FIG. Abut. That is, each pressing side surface 14 changes from a planar shape before contacting the electric wire L (FIG. 7A) to a shape along the peripheral wall of the electric wire L (FIG. 7B). Thus, since each pressing piece 10 is displaced according to the shape of the electric wire L, it is not necessary to change the setting of the holding device 1 even when holding the electric wire L having various diameters. . Further, even when the outer circumferential surface of the electric wire L is uneven, the pressing side surface 14 is displaced along the shape, so that the wire L can be securely held. In addition, since there are as many pressing side surfaces 14 that abut against the electric wires L as the number of the pressing pieces 10 to be laminated, the contact area with the electric wires L is increased, and it is possible to securely hold them with a small force. Furthermore, since many convex parts are formed in each pressing side surface 14, the electric wire L is clamped more reliably by the increase in friction. In addition, since each pressing piece 10 is displaced in the opposite pressing direction when the electric wire L is clamped, even if the electric wire L is inserted with a strong force, an excessive force is not applied to the electric wire L, and the electric wire L is broken or deformed. There is no fear of doing. Further, even when a soft material is used for the covering material, the electric wire L can be held without fear of the covering material being torn or crushed.

  Here, in the case of the electric wire L having a very small diameter, since the elastic deformation of the pressing piece 10 due to the pinching of the electric wire L is small, the force for gripping the electric wire L is small. For this reason, the pair of pressing means 2 and 3 may drop the electric wire L and cannot be securely held. If the material forming the pressing piece 10 is changed to a material having a larger spring constant, the gripping force can be increased. In this case, the configuration of the clamping device 1 is changed depending on the object to be clamped. It will be. However, in the clamping device 1 of the present embodiment, an initial displacement is imparted to each pressing piece 10 by inserting the core shaft 5 inserted through the circular hole portion 25 of the support plate 20 into the long hole portion 15 of the pressing piece 10. Therefore, even when the thin electric wire L is clamped, the same gripping force as that when the electric wire whose diameter is larger than the actual diameter of the electric wire L by the initial displacement is clamped is exhibited. Thereby, it becomes possible to clamp the electric wire L with a small diameter, without making any change to the setting of the clamping device 1.

  Further, when the electric wire L is clamped, each pressing piece 10 is elastically deformed in the counter-pressing direction, but the core shaft 5 inserted into the long hole portion 15 is also inserted into the circular hole portion 15 of the support plate. Each pressing piece 10 cannot be displaced beyond the length of the long hole portion 15 because it is fixed with respect to the support plate 20 that is not displaced during the clamping. That is, as the diameter of the electric wire L to be sandwiched increases, the displacement of the pressing piece 10 in the counter-pressing direction increases, and the core shaft 5 relatively moves the elongated hole portion 15 in the pressing direction along the longitudinal direction. Displace. The displacement of the pressing piece 10 when the core shaft 5 comes into contact with the inner surface of the end portion in the pressing direction of the long hole portion 15 becomes the maximum displacement possible for the pressing piece 10. Therefore, since the range in which the pressing piece 10 is elastically deformed is limited by the length of the long hole portion 15, when a wire thicker than the wire to be sandwiched is sandwiched or a foreign object other than the wire L is accidentally sandwiched However, there is no fear that the pressing piece 10 is deformed beyond the limit of elastic deformation, and is not damaged. That is, with the extremely simple setting of the long hole portion 15, it is possible to provide the holding device 1 having a function of preventing breakage due to a foreign object or the like being caught.

  When the clamped electric wire L is opened at a predetermined position, compressed air is sent from the supply ports 42a and 43a to the piston portions 42 and 43, respectively, so that the piston rods 42p and 43p are inserted into the piston portions 42 and 43, respectively. To work. Thereby, the sliding members 32 and 33 connected to the piston rods 42p and 43p slide along the linear guide 31, and the pressing means 2 and 3 connected to the sliding members 32 and 33, respectively, are linearly connected to each other. The wires L are separated and opened.

  As explained above, according to the clamping device 1 of the present embodiment, when the electric wire L is clamped, the respective pressing pieces 10 are elastically deformed separately so that the pressing side surface 14 follows the outer periphery of the electric wire L. Since it contacts, it becomes possible to clamp regardless of the diameter of the electric wire L. Moreover, since the contact area with the electric wire L increases, it becomes possible to pinch reliably with a small force. Furthermore, since each pressing piece 10 is displaced in the anti-pressing direction by elastic deformation of the arm portion 12 and the arm portion 12 is formed in a tapered shape, this elastic deformation is facilitated, so that strong pinching is performed. Therefore, the electric wire L can be held without fear of the electric wire L being deformed or the covering material being damaged. Further, since the pressing side surface 14 of each pressing piece 10 is formed so as to be inclined in the pressing direction toward the tip, the distance between the pressing side surfaces 14 of the pressing means 2 and 3 facing each other holds the electric wire L. When opening, the degree of opening outward becomes smaller. Thereby, it becomes difficult to escape the electric wire L to pinch, and it becomes possible to pinch it reliably.

  In addition, the change in the distance between the pair of pressing means 2 and 3 is linear, and the arm portion 12 that is elastically deformed when the electric wire L is held is extended in a direction orthogonal to the pressing direction. And since the head 13 is tapered toward the tip, the space required around the head 13 for the operation of the clamping device 1 is small, and the electric wire L is pinched and opened in a narrow space. It becomes possible.

  Further, since each pressing piece 10 is given an initial displacement, even a thin electric wire L can be securely clamped with the same gripping force as when the electric wire L thicker than the initial displacement is clamped. It becomes. In addition, since each pressing piece 10 cannot be displaced beyond the length of the long hole portion 15, the pressing piece 10 is displaced beyond the limit of elastic deformation by the extremely simple setting of the long hole portion 15 and is broken. Can be prevented.

  The present invention has been described with reference to the preferred embodiments. However, the present invention is not limited to the above-described embodiments, and various improvements can be made without departing from the scope of the present invention as described below. And design changes are possible.

  For example, in the present embodiment, the case where the core shaft is fixed to the support plate by being inserted into the circular hole portion of the support plate has been described. However, the present invention is not limited to this, and the support plate on the side in contact with the pressing piece is not limited thereto. On the side surface, the end portion of the core shaft may be fixed at a predetermined position to be fixed to the support plate.

  In the present embodiment, the workpiece clamping device is incorporated in the terminal crimping device and the electric wire is clamped. However, the present invention is not limited to this, and in various processes such as assembly, processing, and sorting of parts. It can be used as a material for sandwiching an article. The object to be sandwiched is not limited to a wire such as an electric wire, and articles having various shapes and hardness can be sandwiched.

It is a perspective view which shows the terminal crimping apparatus with which the workpiece | work clamping device which is one Embodiment of this invention was integrated. It is explanatory drawing for demonstrating operation | movement of a terminal crimping | compression-bonding apparatus. It is explanatory drawing for demonstrating operation | movement of a terminal crimping | compression-bonding apparatus. It is a perspective view which shows the structure of a workpiece | work clamping device. It is a disassembled perspective view which shows the structure of the press means of a workpiece | work clamping device. It is explanatory drawing which shows the structure of the press means of a workpiece | work clamping device. It is explanatory drawing for demonstrating operation | movement of a press means. It is explanatory drawing which shows the structure of the conventional electric wire clamping apparatus.

Explanation of symbols

1 Clamping device (work clamping device)
2, 3 Pressing means 5 Core shaft 10 Pressing piece 11 Base part 12 Arm part 13 Head part 15 Long hole part 20 Support plate 30 Spacing variable mechanism (spacing variable means)

Claims (5)

A workpiece clamping device for clamping a workpiece by a pair of pressing means,
Each of the pressing means includes a plurality of pressing pieces formed and laminated in a thin plate shape,
Each pressing piece is
A base connected to an interval variable means for linearly changing an interval between the pair of pressing means;
An arm that extends from the base and is elastically deformable when sandwiching the workpiece;
A head portion that extends from an end portion of the arm portion facing the end portion on the base side and presses the workpiece in a pressing direction orthogonal to a longitudinal direction of the arm portion. Work clamping device. Each said pressing means is
A pair of support plates disposed at both ends of the stacked pressing pieces and connected to the interval variable means directly or via the pressing pieces;
A slotted hole formed in the head of each of the pressing pieces, the longitudinal direction of which coincides with the pressing direction;
A core shaft fixed to the pair of support plates and penetrating through the elongated hole portion;
The core shaft is
Due to the contact of the long hole portion with the end portion in the opposite pressing direction opposite to the pressing direction, each of the pressing pieces is displaced in the opposite pressing direction in the initial state before the workpiece is clamped. The initial displacement is given in advance, and the maximum displacement of each of the pressing pieces is defined by contact with the end of the elongated hole in the pressing direction. Work clamping device. The arm is
The workpiece clamping device according to claim 1, wherein the workpiece clamping device is formed to be gradually tapered from an end on the base side toward an end on the head side. The head is
The pressing side surface that contacts and presses against the workpiece is inclined in the pressing direction toward the tip in an initial state before the workpiece is clamped. The work clamping apparatus as described in one. The pair of pressing means is
The work clamping apparatus according to any one of claims 1 to 4, wherein an end portion that presses the work is tapered toward a tip.

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