JP5506562B2 - Clamp mechanism of transfer press feed device - Google Patents

Description

  The present invention relates to a clamping mechanism of a transfer press feed device, and more particularly, to a clamping mechanism capable of holding and handling a workpiece favorably from only one side.

  FIG. 8 shows a feed device 94 of a conventional transfer press 9. In the figure, 91 is a bolster, 92 is a common plate, and 93 is a metal mold continuously provided on the common plate 92. The feed device 94 is provided on both sides of each mold 93, and the fingers 941 provided on both feed devices 94 are opposed to both sides of the workpiece W in each mold 93. And the workpiece | work W is hold | gripped by moving the finger 941 of both the feeders 94 to an opposing direction. Such a structure is shown in Patent Document 1, for example.

JP 2004-74209 A

  In the above conventional structure, in order to shorten the cycle time, it is necessary to place the finger 941 in the stand-by state in close proximity to the mold 93 as much as possible. Therefore, there is a possibility that the fingers 941 extending from both sides may interfere with the mold 93 when changing the mold, and in order to avoid this, it is necessary to remove the fingers 941 or move them to the retracted position. Therefore, as shown in FIG. 9, if a feed device 94 having a pair of gripping arms 941A and 941B is provided only on one side of the workpiece W to grip the workpiece W, the mold 93 is moved to the gripping arm 941A, The mold can be easily changed by pulling it out to the side opposite to 941B. However, in this case, the pair of gripping arms 941A and 941B must be reliably operated at the same timing to properly grip the workpiece W having a different outer shape.

  Therefore, the present invention solves such a problem, and provides a clamping mechanism for a feed device of a transfer press that can properly grip a workpiece having a different outer shape by reliably operating a pair of gripping arms at the same timing. The purpose is to do.

  In order to achieve the above object, according to the first aspect of the present invention, a base (1) capable of reciprocating in the workpiece transfer direction, and a first moving body (2) provided on the base (1) so as to be movable back and forth. ), A driving means (16) for moving the first moving body (2) in the front-rear direction, a second moving body (4) provided on the first moving body (2) so as to be movable back and forth, A first urging means (23) for urging the second moving body (4) forward and a symmetric position on both sides of the second moving body (4), in a direction toward and away from each other. It has a back surface that is linearly movable and has an inclination so that the relative distance between the proximal end (51) and the distal end (53) increases, and the distal end (53) includes a gripping portion (54) that faces each other. A pair of gripping arms (5A, 5B) and second biasing means (42) for biasing these gripping arms (5A, 5B) in the separating direction; A stopper member (17, 24) for restricting the movement of the second moving body (4) that moves forward integrally with the first moving body (2) and the both sides of the first moving body (2) are symmetrical. A pair of operation arms (3A, 3B) whose middle part is pivotally supported at the position and projecting forward, and whose tips (32) abut against the back surfaces (52a) of the gripping arms (5A, 5B), respectively; An operating body (71) provided on the movable body (2) so as to be movable back and forth, a third biasing means (72) for biasing the operating body (71) forward, and the operating body (71) Both ends of the operation arms (3A, 3B) are pivotally connected to the base ends, and the urging force of the third urging means (72) is transmitted to the operation arms (3A, 3B) to perform the operation. The back surface (52a) of the grip arm (5A, 5B) is pressed by the tip (32) of the arm (3A, 3B). Link arms (6A, 6B).

  In the first invention, when the workpiece is gripped, the first moving body is moved forward by the driving means. Until the second moving body is regulated by the stopper member, the second moving body and the gripping arm on the first moving body move forward together with the first moving body while maintaining the state, and the pair of gripping arms is moved to the workpiece. Advance to a position where you can pinch. When the first moving body is further advanced, the advancement of the second moving body is restricted by the stopper member, so that only the operation arm provided on the first moving body moves forward together with the first moving body, The tip of the operating arm pushes the back of each gripping arm, and the gripping arm is moved in the same amount in the opposite direction and in the close direction against the biasing force of the second biasing means at the same time. Hold the workpiece in

  Since the gripping arms can be moved in a straight line toward or away from each other without changing their posture in plan view, the tips of both gripping arms are always positioned radially symmetrically on the outer peripheral surface of the workpiece even when the outer diameter of the workpiece changes. A reliable gripping function is exhibited by contacting the Here, when the outer diameter of the workpiece changes when the advance distance of the first moving body is constant, the positions of the gripping arm and the operation arm change accordingly. It is absorbed when the operating body moves back and forth while appropriately expanding and contracting. In this way, a pair of gripping arms can be reliably operated at the same timing, and workpieces of different sizes can be gripped properly. After gripping the workpiece, the base is moved in the workpiece conveyance direction. Thereafter, when the first moving body is retracted, the gripping arm is opened and the gripping of the workpiece is canceled.

  In the second invention, the pair of gripping arms (5A, 5B) can be linearly moved in directions in which the base ends (51) are fitted to the guide shaft (41) and approach each other along the guide shaft (41). The second biasing means (42) is disposed around the guide shaft (41) between the base ends (51) of the grip arms (5A, 5B).

  In addition, the code | symbol in the said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.

  As described above, according to the clamp mechanism of the transfer press feed device of the present invention, a pair of gripping arms can be reliably operated at the same timing to properly grip workpieces having different external shapes. If the clamping mechanism of the present invention is used, the feed device can be provided only on one side of the workpiece (die), and therefore the die can be easily formed by pulling the die to the side opposite to the feed device. Can be replaced.

It is a top view of a feed apparatus when a clamp mechanism exists in an original position which shows one Embodiment of this invention. It is a top view of a feed apparatus when a clamp mechanism exists in an advance position. It is a top view of a feed apparatus when a clamp mechanism exists in a clamp position. It is a top view of a feed apparatus when a clamp mechanism exists in an unclamp position. It is a top view of a feed apparatus in case a clamp mechanism is a misclamp. It is a partial cross section side view of a feed device when a clamp mechanism exists in a clamp position. It is a vertical sectional view of the roller installation part of the operation arm. It is a schematic plan view of the feed apparatus of the conventional transfer press. It is a schematic plan view of the feed apparatus of the conventional transfer press.

  FIG. 1 shows a plan view of a clamping mechanism of a feed device according to the present invention, and FIG. 6 shows a partial sectional side view thereof. 1 shows a state in which the clamp mechanism M is in the original position, and FIG. 6 shows a state in which the clamp mechanism M is in the clamp position. The feed device includes a base 1, and the base 1 is reciprocated in a vertical direction in FIG. 1 and a horizontal direction in FIG.

  A first moving body 2 is provided above the base 1. The first moving body 2 is a long plate having a constant width extending in the left-right direction in FIG. 1, and a necessary number (for example, four for realizing the feed device shown in FIG. 8) of clamp mechanisms M in the longitudinal direction on the upper surface. It is installed at equal intervals. FIG. 1 shows one of a plurality of clamp mechanisms.

  The first moving body 2 is supported on a block-like nut member 12 as shown in FIG. The nut member 12 is a quadrangular prism body, and the first moving body 2 is mounted on the upper surface thereof, and the lower surface thereof is guided by a rail member 11 provided on the base 1, and the left-right direction (FIG. 1 is guided so as to be linearly movable in the vertical direction.

  A ball screw member 13 is threaded through the center of the nut member 12. The base end portion of the ball screw member 13 is rotatably supported by a bearing member 14 provided on the base 1, and an output shaft of a motor 16 as a driving means provided on the base 1 via a coupling member 15. 161. Therefore, by rotating the motor 16 forward and backward, the first moving body 2 is moved back and forth linearly (up and down in FIG. 1 and left and right in FIG. 6) via the ball screw member 13 and the nut member 12. In FIG. 1, the first moving body 2 is in the rear end position.

  A substantially quadrangular second moving body 4 is provided on the first moving body 2 in a plan view, and the second moving body 4 is arranged in the vertical direction of the drawing in FIG. 1 by a parallel rail 21 provided on the first moving body 2. It can move in a certain direction. On the central part of the rear end of the plate surface of the second moving body 4, there is provided a spring receiving block 43 formed with a recess that opens backward, and this and the spring receiving block provided on the plate surface of the first moving body 2. A pair of left and right coiled spring members 23 (FIG. 1) are disposed between the two springs 23 as first biasing means to bias the second moving body 4 forward (upward in FIG. 1). Thereby, the front end of the second moving body 4 protrudes forward by a predetermined amount from the front end of the first moving body 2.

  A guide shaft 41 having a circular cross section in the horizontal direction is provided horizontally on the front end edge of the second moving body 4, and each guide base 41 has a cylindrical base end 51 of a pair of gripping arms 5 </ b> A and 5 </ b> B, which will be described in detail later. It is mounted so that it can rotate. A coil-shaped spring member 42 is disposed around the guide shaft 41 as second urging means, and the left and right grip arms 5A and 5B are urged away from each other by the spring force. Yes.

  The arm portions 52 of the gripping arms 5A and 5B extend forward beyond the first moving body 2, and the gripping arms 54 protrude inward so that the gripping portions 54 face each other on the bottom surface of the tip 53 of the gripping arms 5A and 5B. Yes. The tip of the grip portion 54 is recessed in an arc surface substantially along the outer periphery of the workpiece W to be sandwiched (circular in the present embodiment). The arm portions 52 of the gripping arms 5A and 5B project forward while opening in an eight-letter shape, and the back surfaces 52a of the arm portions 52 are inclined so that the relative distance increases from the proximal end 51 toward the distal end 53. ing.

  On the front edge plate surface of the first moving body 2, shaft members 31 are erected at the left and right positions, respectively, and intermediate portions of the pair of operation arms 3A and 3B are rotatably supported. Rollers 32 are attached to the tips of the operation arms 3A and 3B, and these rollers 32 are in contact with the back surfaces 52a of the arm portions 52 of the gripping arms 5A and 5B. In the original position of the clamping mechanism shown in FIG. 1, the roller 32 is in contact with the proximal end of the back surface 52a of each gripping arm 5A, 5B. As shown in FIG. 7, the back surface 52a has an upright surface in the lower half portion and an inclined surface in the upper half portion that faces downward. On the other hand, the roller 32 has a cross-sectional shape of the back surface 52a. The upper half is an inclined surface facing upward along the shape. Accordingly, the gripping arms 5A and 5B are supported in a horizontal posture by the roller 32, and can be lifted and swung upward as necessary, as will be described later.

  The arm portions 33 of the operation arms 3A and 3B extend in the front-rear direction, and one end of each of the link arms 6A and 6B is rotatably connected to the rear end. In addition, the ratio of the length of the front side part and the rear side part with respect to the shaft member 31 in the arm part 33 is approximately 1: 1. The other end of each of the link arms 6A and 6B is rotatably connected to a block-like operation body 71 disposed on the first moving body 2.

  The operating body 71 is pressed and urged at the back by a coiled spring member 72 as third urging means disposed between the recess and the spring receiving block 73 on the first moving body 2. Due to this urging force, the rear ends of the operation arms 5A and 5B are pressed outward through the left and right link arms 3A and 3B, whereby the rollers 32 at the front ends of the operation arms are moved to the arms of the gripping arms 5A and 5B. The portion 52 is in pressure contact with the back surface 52a. A proximity sensor 74 is provided above the operating body 71 to detect a misgrip caused by the gripping arms 5A and 5B as will be described later.

  In the clamp mechanism M having such a structure, when the workpiece W is gripped, the ball screw 13 is rotated forward by the motor 16 to move the first moving body 2 forward from the original position, and clamped to the forward movement position shown in FIG. Position mechanism M. In this state, the second moving body 4, the gripping arms 5A and 5B, the operating arms 3A and 3B, the operating body 71, and the spring members 23, 41, and 72 on the first moving body 2 remain in their original positions. It moves forward together with the first moving body 2, and the left and right grip arms 5A, 5B advance to a position where the workpiece W can be clamped.

  When the first moving body 2 is further advanced, the columnar stopper member 24 (FIG. 6) provided so that the second moving body 4 hangs from the second moving body 4 is formed on the stopper member 17 formed of a U-shaped channel provided on the base 1. Advancing is restricted by abutting against the inner surface of the front side wall, and only the operation arms 3A and 3B provided on the first moving body 2 move forward together with the first moving body 2 to the clamp position. As a result, as shown in FIG. 3, the rollers 32 at the front ends of the left and right operation arms 3 </ b> A and 3 </ b> B relatively move the back surfaces 52 a of the gripping arms 5 </ b> A and 5 </ b> B from the base end 51 toward the front end 53. As a result, the grip arms 5A and 5B have the same timing in the adjacent direction in the opposite direction against the urging force of the spring member 42 when the back surface 52a of the arm portion 52 is pushed by the rollers 32 of the operation arms 3A and 3B. And the workpiece W is clamped between the gripping portions 54.

  Here, when the outer diameter of the workpiece W changes in size while the advance distance of the first moving body 2 is constant, the rotational positions of the gripping arms 5A and 5B and the operation arms 3A and 3B change accordingly. However, this is absorbed by the operation piece 71 moving back and forth while appropriately expanding and contracting the spring member 72. Further, since the gripping arms 5A and 5B can be moved inward and outward along the guide shaft 41 without changing their postures in plan view, even if the outer diameter of the workpiece W changes, the gripping arms 5A and 5B The tip of the gripping part 54 always comes into contact with the radially symmetric position of the outer peripheral surface of the work W, and a reliable gripping function is exhibited.

  After raising the base 1 in a state where the workpiece W is gripped by the pair of gripping arms 5A and 5B in this way, the base 1 is moved the same distance as the installation interval of the clamp mechanism M, and then the first moving body 2 is moved backward. The gripping arms 5A and 5B are opened to cancel the gripping of the workpiece W (FIG. 4). In this way, the workpiece W is transferred and supplied to the next adjacent mold. Thereafter, the base 1 is returned to the original position, the first moving body 2 is retracted, and the clamp mechanism M is returned to the original position (FIG. 1). When a new workpiece W is supplied, the first moving body 2 is advanced to grip the workpiece W again. By repeating this, the workpiece W can be transferred and supplied into the molds that are sequentially arranged.

  Since the feed device provided with the clamp mechanism M only needs to be installed on one side of the mold, the mold can be easily changed by pulling the mold to the side opposite to the feed device.

  When the gripping arms 5A, 5B fail to grip the workpiece W (mis-grip) (FIG. 5), the gripping arms 5A, 5B are pressed by the operation arms 3A, 3B and turn inward in the opposite direction more than usual. Accordingly, the operating body 71 moves forward and deviates from the detection area below the proximity sensor 74. As a result, a workpiece grip failure signal is output from the proximity sensor 74, and the operation of the feed device is stopped. In the case of a misgrip, as shown by the chain line in FIG. 6, the workpiece W can be easily removed by lifting the gripping arms 5A and 5B around the guide shaft 41 and turning them.

DESCRIPTION OF SYMBOLS 1 ... Base, 16 ... Motor (drive means), 17 ... Stopper member, 2 ... 1st moving body, 23 ... Spring member (1st biasing means), 24 ... Stopper member, 3A, 3B ... Operation arm, 32 ... Roller (front end), 4 ... second moving body, 41 ... guide shaft, 42 ... spring member (second urging means), 5A, 5B ... gripping arm, 51 ... base end, 52 ... arm portion, 52a ... rear surface , 53 ... tip, 54 ... gripping part, 6A, 6B ... link arm, 71 ... operating body, 72 ... spring member (third biasing means).

Claims (2)

A base capable of reciprocating in the workpiece transfer direction, a first moving body provided on the base so as to be movable back and forth, a driving means for moving the first moving body in the front-rear direction, and the first moving body A second moving body provided on the upper side so as to be movable back and forth, a first urging means for urging the second moving body forward, and provided at symmetrical positions on both sides of the second moving body, approach each other. A pair of gripping arms that are linearly movable in a direction away from the direction and have a back surface that is inclined so that a relative interval increases from the base end to the tip, and provided with gripping portions facing each other at the tip; A second urging means for urging the gripping arm in the separating direction; a stopper member for restricting the movement of the second moving body that moves forward together with the first moving body; and the first moving body. The middle part is pivotally supported at the symmetrical position on both sides and protrudes forward A pair of operating arms whose tips abut against the back surface of the gripping arm, an operating body provided on the first moving body so as to be able to move back and forth, and third biasing means for biasing the operating body forward And both ends of the operation body and a base end of each operation arm are rotatably connected, and the urging force of the third urging means is transmitted to the operation arm so that the grip arm A clamp mechanism for a feed device of a transfer press, comprising a link arm for pressing the back surface of the transfer press. Each of the pair of gripping arms is fitted to a guide shaft and is linearly movable in a direction toward and away from each other along the guide shaft, and the second urging means is disposed between the base ends of the gripping arms. The clamp mechanism of the feed apparatus of the transfer press according to claim 1, which is disposed around the guide shaft.

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