JP2006159283A - Transfer chuck in heading machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To computerize the opening/closing drive in an opening/closing chuck according to the position of this chuck and the timing for needing the opening/closing function without connecting with a cam-driving system linked with a reciprocating motion of ram. <P>SOLUTION: This mechanism is constituted, of which a supporting base 14 pivotally supporting one pair of the opening/closing chucks 12, 13 at the lower part of the chuck body 11 in the chuck unit B of transfer chuck 5 and also, a driving shaft 15 for opening/closing the above chucks 12, 13 is supported so as to be vertically shiftable at the upper part of the chuck body 11 and on the other side, the above chucks 12, 13 are opened/closed by vertically shifting the driving shaft 15 while connecting the lower end of the driving shaft 15 with the above chucks 12, 13 through a linking mechanism and furthermore, a servo-motor 23 having ball-screw 22 engaged with the upper part of the driving shaft 15 through a linking frame 24 is arranged at the upper part of the chuck body 11 so as to vertically shift the driving shaft 15 by rotating the servo-motor 23. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, a chuck frame is provided on the front surface of a die block in which a plurality of dies are arranged side by side so as to be reciprocally swingable in the direction in which the dies are arranged, and a chuck unit having an open / close chuck and an open chuck is provided on the front surface of the chuck frame. The present invention relates to a transfer chuck in a forging machine that is attached in a replaceable manner.

Conventionally, as this type of transfer chuck, for example, a peripheral cam is fixed to a cam shaft that rotates in conjunction with a reciprocating motion of a ram, and a pair of opening and closing chucks are provided at the lower end of a tube shaft that reciprocates between the front surfaces of adjacent dies. Is freely opened and closed, and an operation rod is inserted into the tube shaft to engage with the pair of chucks and open and close the chuck by movement in the axial direction, and one end portion of the support is fixed to the frame. A structure in which a lever oscillated and biased in a direction to engage with the peripheral cam is pivotally supported so that a free end portion of the lever is engaged with an operation rod, and the chuck is opened and closed in conjunction with a ram. On the other hand, a first gear having an axial center in the vertical direction is provided above an intermediate position between adjacent dies of the die block, and the left and right sides centering on the shaft center of the first gear are interlocked with the reciprocating motion of the ram. Oscillation at a constant angle with equal oscillation angle A second gear is rotatably supported on the generated rocking body (chuck frame), and the chuck is supported on the lower end of a support shaft that is fixed and suspended at the center of the second gear. The first gear and the second gear are The workpiece clamped by the open / close chuck can be rotated 180 ° with both gears engaged, and the original posture can be obtained with both gears non-engaged. It is known to transfer to the front of another adjacent die while keeping
Japanese Utility Model Publication No. 62-35545

  However, according to the above-described transfer chuck, it is necessary to provide a complicated cam interlocking mechanism with a chuck opening / closing lever that moves the operating rod up and down in conjunction with the reciprocating motion of the ram, so that the structure is provided. However, there is a problem that the assembly to the forging machine is complicated and the position and movement of the opening / closing chuck are restricted by the cam interlocking mechanism.

  Therefore, the present invention eliminates the relationship with the cam interlocking mechanism that interlocks with the reciprocating motion of the ram when performing the opening / closing drive of the opening / closing chuck, so that the position and the opening / closing function of the opening / closing chuck can be computerized according to the required timing. Furthermore, it is an object of the present invention to provide a transfer chuck in a forging machine that can give various movements to the opening and closing chuck.

  In order to solve the above-mentioned problems, the invention according to claim 1 of the present application is provided with a chuck frame on the front surface of a die block in which a plurality of dies are arranged side by side so as to be reciprocally swingable in the direction in which the dies are arranged. A transfer chuck in a forging machine in which a chuck unit having an open / close chuck and an open chuck is replaceably mounted on the front surface of the frame, and supports a support base that pivotally supports a pair of open / close chucks at the bottom of the chuck body in the chuck unit At the same time, a driving shaft for opening and closing the chuck is supported on the upper part of the chuck body so as to be movable up and down, while a lower end of the driving shaft is connected to the chuck via a linkage mechanism, and the chuck is opened and closed by moving the driving shaft up and down. On the other hand, hydraulic pressure that moves the drive shaft up and down at a predetermined timing above the drive shaft above the chuck body Linda, characterized in that a driving means such as a pneumatic cylinder or a servo motor.

  In addition to the configuration described in claim 1, the invention described in claim 2 of the present application supports the drive shaft on the upper portion of the chuck body so that the drive shaft can be moved up and down and rotated, and the lower portion of the drive shaft is supported by a support base. A pitch circle is provided at the center of the die block so as to be non-rotatable and movable in the axial direction. And a cylindrical shaft having a second gear meshing with the first gear is rotatably supported by the upper support portion of the chuck body, and the upper portion of the drive shaft cannot be rotated within the cylindrical shaft. In addition, it was inserted so as to be movable in the axial direction, and when the chuck unit was reciprocally swung, the drive shaft was rotated by the meshing of the first gear and the second gear, and the support base was rotated 180 ° with respect to the chuck body. Special To.

  In addition to the configuration described in claim 2, the invention described in claim 3 of the present application is provided with urging means for constantly urging the drive shaft downward to close the open / close chuck, and at the top of the drive shaft. And the servo motor ball screw via a coupling member, and when the ball screw is raised by the rotation of the servo motor, the drive shaft is pulled up against the biasing means via the linkage member, and the chuck When the ball screw is lowered, a play in the axial direction is provided between the linkage member and the ball screw so as to close the chuck by pushing down the drive shaft with a predetermined biasing force by the biasing means. Features.

  In addition to the configuration described in claim 2, the invention described in claim 4 of the present application is provided with a chuck unit on the chuck frame side in accordance with a predetermined timing at which the chuck unit moves between dies by reciprocal swinging. It is characterized by comprising a front-rear moving means and a lifting means for performing either one or both of the front-rear movement and the lift.

  Further, in the invention described in claim 5 of the present application, in addition to the configuration described in claim 2, the chuck unit is provided on the chuck frame side in accordance with a predetermined timing at which the chuck unit moves between the dies by reciprocal swinging. It is characterized by having a pendulum movement means for moving the pendulum forward.

  According to the transfer chuck of the forging machine of the present invention, the support base for pivotally supporting the pair of opening and closing chucks is supported below the chuck body in the chuck unit, and the drive shaft for opening and closing the chuck is moved up and down on the chuck body. On the other hand, the lower end of the drive shaft is connected to the chuck via a linkage mechanism, and the chuck is opened and closed by moving the drive shaft up and down. Since the servo shaft is provided and the drive shaft is moved up and down by the rotation of the servo motor, a swing lever that opens and closes the chuck by moving the drive shaft up and down is not required, and the ram reciprocates. Since it is no longer related to the cam interlocking mechanism that is linked to the movement, the position of the opening and closing chuck and the opening and closing function can be used. It can be computerized in accordance with the ring.

  Further, a cylindrical shaft having a second gear meshing with a first gear provided above an intermediate position between adjacent dies of the die block is rotatably supported by an upper support portion of the chuck body and driven into the cylindrical shaft. The upper part of the shaft is inserted so as not to rotate and is movable in the axial direction. When the chuck unit is reciprocally swung, the drive shaft is rotated by meshing with the first gear and the second gear, and the support base is rotated 180 with respect to the chuck body. If it is rotated, the drive shaft can be rotated while allowing its vertical movement with a simple configuration.

  Also, a biasing means for biasing the drive shaft downward at all times to close the opening / closing chuck is provided, and the upper portion of the drive shaft and the ball screw of the servo motor are connected to each other via a linkage member so as to freely rotate. When the ball screw is raised by rotation, the drive shaft is pulled up against the biasing means via the linkage member to release the chuck, and when the ball screw is lowered, it is driven with a predetermined biasing force by the biasing means. Since the axial play is provided between the connecting member and the ball screw so as to close the chuck by pushing down the shaft, the workpiece is always applied with a constant biasing force by the biasing means when the open / close chuck holds the workpiece. Can be securely clamped without dropping or scratching.

  Further, by providing a driving means such as a servo motor on the upper part of the chuck body, the chuck unit can be easily moved relative to the chuck frame by providing a back-and-forth moving means, an elevating means or a pendulum moving means on the chuck frame side. It can be moved back and forth, moved up and down, or moved forward by a pendulum. As a result, the opening and closing chuck can be moved in various ways such as opening and closing and 180 ° rotation, as well as back and forth movement and elevation. Become.

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

  1 and 2 show a forging machine equipped with a transfer chuck according to the present invention, and a die block 3 is disposed at a predetermined position of a machine base 2 in the forging machine 1, and the die block 3 includes: A plurality of dies 4... 4 ranging from rough to fine are arranged in parallel at regular intervals. Further, a ram (not shown) that moves back and forth with respect to the die block 3 is provided at a front position of the die block 3, and a plurality of rams are provided on the front surface of the ram so as to face the dies 4. A punch (not shown) is provided.

  Above the die block 3, a transfer chuck 5 for sequentially conveying the material from the front die to the final die is provided. The transfer chuck 5 is a frame member disposed on the machine base 2. 6 and a pair of left and right swing arms 7 and 7 which are pivotally mounted at one end on both side portions of the frame member 6, and both side portions at the other end of the swing arms 7 and 7, respectively. A chuck frame 8 that is rotatable, an intermediate frame 9 that is rotatably connected to the pair of swing arms 7 and 7 between the chuck frame 8 and the frame member 6; A plurality of chuck units A, B, and C are provided on the front surface of the chuck frame 8 at the same interval as the parallel arrangement intervals of the dies 4 and as many as the dies 4. On one side of the chuck frame 8, the chuck frame 8 is reciprocated in the direction in which the dies 4 are juxtaposed by a drive rod R that is reciprocated with a predetermined stroke in synchronism with the advancing and retreating operation of the ram. Each chuck unit A, B, C attached to the front surface of the frame 8 is driven to reciprocate between the positions of the axial front surfaces of the adjacent dies 4.

  3 and 4, the chuck unit B according to the present invention includes a cassette-structured chuck body 11 that is detachably attached to the front surface of the chuck frame 8, and a lower support portion of the chuck body 11. A support base 14 that pivotally supports a pair of open / close chucks 12 and 13 is supported by 11a through a cylindrical portion 14a formed at the center thereof, and can be rotated only, and a cylinder described later on an upper support portion 11b of the chuck body 11. A drive shaft 15 that opens and closes the chucks 12 and 13 via the shaft is supported so as to be movable up and down and rotatable. Then, the lower portion of the drive shaft 15 is inserted into the cylindrical portion 14a, the lower end thereof is connected to the chucks 12 and 13 via a connecting mechanism described later, and the chucks 12 and 13 are opened and closed by the vertical movement of the drive shaft 15, A portion near the lower portion of the drive shaft 15 is supported at the central portion of the support base 14 so as not to rotate and to be movable in the axial direction, and the support base 14 is integrally rotated by the rotation of the drive shaft 15. As a structure for supporting the drive shaft 15 on the support base 14 so as not to rotate and to be movable in the axial direction, for example, a connection using a long hole and a pin or a spline connection may be employed.

  In addition, a first gear 16 provided with a pitch circle is provided on the upper part of the intermediate frame 9 in accordance with a trajectory in which the chuck unit B moves between dies by reciprocating swinging, while a second gear 17 meshing with the first gear 16 is provided. A cylindrical shaft 18 with a chuck shaft 11 is rotatably supported by the upper support portion 11b of the chuck body 11, and the upper portion of the drive shaft 15 is inserted into the cylindrical shaft 18 so as not to be rotatable and movable in the axial direction. When the chuck unit B is reciprocally swung, the drive shaft 15, that is, the support base 14 is rotated by 180 ° with respect to the chuck body 11 by the meshing of the first gear 16 and the second gear 17. As a structure for supporting the upper portion of the drive shaft 15 in the cylinder shaft 18 so as not to rotate and to be movable in the axial direction, for example, a combination of a long hole and a pin or a spline connection may be employed.

  A biasing spring 19 that normally biases the drive shaft 15 downward is provided between the lower surface of the upper support portion 11 b of the chuck body 11 and the intermediate portion of the drive shaft 15, while a connecting portion is provided at the upper end of the drive shaft 15. 15a is provided, a bracket 21 rising upward is provided on the front surface of the upper support portion 11b of the chuck body 11, and a servo motor 23 having a ball screw 22 is provided on the bracket 21, so that the tip of the ball screw 22 and the upper end of the drive shaft 15 are connected. The drive shaft 15 is configured to be moved up and down via the linkage frame 24 by the vertical movement of the ball screw 22 accompanying the rotation of the servo motor 23. That is, by moving the ball screw 22 upward, the drive shaft 15 is lifted against the biasing spring 19 via the linkage frame 24 to open the opening and closing chucks 12 and 13, and by moving the ball screw 22 downward. The drive shaft 15 is moved downward by the urging spring 19 through the linkage frame 24 to close the open / close chucks 12 and 13 and grip the workpiece W.

  In the embodiment shown in the figure, when the ball screw 22 is lowered, the linkage frame 24, the ball screw 22, and the chuck 12 are closed so that the drive shaft 15 is pushed down by a predetermined urging force by the urging spring 19. A play S in the axial direction is provided between them.

  On the other hand, a pair of opening and closing chucks 12 and 13 composed of a claw portion and an arm portion are pivotally supported on the support base 14 in an intersecting manner, and swing coupling plates 25 and 26 provided near the shaft supporting portions of the opening and closing chucks 12 and 13. When the drive shaft 15 is connected to the open / close chucks 12 and 13 via the opening and the open / close chucks 12 and 13 are opened, the shaft fulcrum of the drive shaft 15 with the swing connecting plates 25 and 26 and the open / close chucks 12 and 13 are swung. When the shaft fulcrum with the moving plates 25 and 26 has a triangular shape and the open / close chucks 12 and 13 are closed, the three shaft fulcrums approach a straight line and the hinge is opened to generate a strong grip force. It is configured as follows. As a result, the workpiece W can be securely and firmly held by the open / close chucks 12 and 13 by using the tensioning action, and there is no shake-off during the transfer, so that the speed of the workpiece transfer can be increased.

The servo motor 23 is driven by a rotary encoder or the like from the side of the main drive motor that drives the crankshaft or crankshaft that moves the ram back and forth, for example, via a control means (not shown) such as a computer. The servo motor 23 may be driven.
Further, when checking the size and shape of the workpiece W, the servo motor 23 is arbitrarily driven by the operation of the operator's operation unit (not shown) to open the open / close chucks 12 and 13, or the workpiece W When a malfunction such as biting of the punch occurs, the servo motor 23 is preferentially driven by a detection signal from a sensor (not shown) that detects this to forcibly open the open / close chuck. Has been.

  The chuck unit B provided with the above-described open / close chucks 12 and 13 for rotational transfer is attached to the chuck frame 8 by inserting the screw hole 8a provided at a predetermined position on the front surface of the chuck frame 8 into the boss portion 11c of the chuck body 11. What is necessary is just to fasten the bolts 30 and 30 which were done.

  As described above, according to the transfer chuck in the forging machine of the present invention, the support base 14 that supports the pair of opening and closing chucks 12 and 13 is supported on the lower portion of the chuck body 11 in the chuck unit B, and the upper portion of the chuck body 11 is supported. The drive shaft 15 for opening and closing the chucks 12 and 13 is supported so as to be movable up and down, while the lower end of the drive shaft 15 is connected to the chucks 12 and 13 through a linkage mechanism, and the chucks 12 and 13 are moved by the vertical movement of the drive shaft. 13 is opened and closed, and a servo motor 23 having a ball screw 22 engaged with the upper portion of the drive shaft 15 via the linkage frame 24 is provided at the upper portion of the chuck body 11, and the drive shaft 15 is moved up and down by the rotation of the servo motor 23. Thus, there is no swing lever that opens and closes the open / close chuck by moving the drive shaft up and down as in the prior art. Next, that is, the complex cam drive mechanism for driving the swing lever can be dispensed, position and opening and closing function of closing the chuck can be computerized in accordance with the needful timing.

  Further, a cylindrical shaft 18 having a second gear 17 meshing with a first gear 16 provided above an intermediate position between adjacent dies 4 of the die block 3 is rotatably supported on the upper support portion 11b of the chuck body 11, Further, the upper part of the drive shaft 15 is inserted into the cylindrical shaft 18 so as not to rotate and to be movable in the axial direction, and is driven by meshing of the first gear 16 and the second gear 17 when the chuck unit B is reciprocally swung. Since the shaft 15 is rotated so that the support base 14 is rotated by 180 ° with respect to the chuck body 11, the rotation of the open / close chucks 12, 13 and the chuck 12 by the rotation and vertical movement of one drive shaft 15. , 13 can be accurately opened and closed with a simple structure.

  Further, an urging spring 19 is provided to normally urge the drive shaft 15 downward to close the open / close chucks 12 and 13, and the upper portion of the drive shaft 15 and the ball screw 22 of the servo motor 23 are respectively connected via the linkage frame 24. When the ball screw 22 is lifted by rotation of the servo motor 23 while being connected freely, the drive shaft 15 is lifted against the biasing spring 19 via the linkage frame 24 to open the chucks 12 and 13. When the ball screw 22 is lowered, an axial play S is provided between the linkage frame 24 and the ball screw so as to close the chucks 12 and 13 by pushing down the drive shaft 15 with a predetermined urging force by the urging spring 19. Therefore, when the ball screw 22 is lowered and the work W is clamped by the open / close chucks 12 and 13, the ball screw 22 is moved by the play S to the drive shaft 15. Rather than pushing directly, thus depressing the drive shaft 15 by the biasing force of the biasing spring 19. As a result, by stopping the ball screw 22 within the range of the play S, the workpiece W can always be securely held without being damaged or dropped by a constant biasing force by the biasing spring 19.

  Further, when the open / close chucks 12 and 13 are opened and closed by the servo motor 23 provided at the upper part of the chuck unit B, the front / rear moving means 32 for moving the chuck unit B back and forth with respect to the chuck frame 8 The raising / lowering means 33 can be provided without difficulty, and as a result, various movements such as back-and-forth movement and elevation can be given to the open / close chucks 12 and 13.

  That is, as shown in FIG. 5, the chuck frame 8 is divided into a first frame 8A supported by the swing arm 7 and a second frame 8B supporting the chuck unit B, and the second frame 8B is divided into the first frame 8A. On the other hand, while being supported to be movable in the front-rear direction via the guide rods 31, 31, the second frame 8B is moved back and forth with respect to the first frame 8A by the front-rear cylinder 32 provided in the first frame 8A. The chuck unit B is supported by the first frame 8A so as to be movable up and down by groove fitting, and the chuck unit B is moved up and down with respect to the second frame 8B by a lift cylinder 33 provided in the second frame 8B.

  Thus, when the front and rear cylinders 32 are provided and the chuck unit B is moved forward together with the second frame 8B at a predetermined timing, for example, a work W that has been forged such as a short shoulder part is positively moved by the opening and closing chucks 12 and 13. In addition, it can be pushed forward from the die, and when crushing both sides of parts such as a valve retainer, the claw portions of the opening and closing chucks 12 and 13 are in close contact with the die 4 during forging and when the workpiece W is pushed out of the die. When rotating, the workpiece W can be moved back and forth so as not to interfere with the rotational motion by separating the workpiece W to a distance that does not hit the die 4. Further, by providing the elevating cylinder 33, the open / close chucks 12 and 13 can be released to the upper position even for forging with a punch having a diameter larger than the opening of the claws of the open / close chucks 12 and 13. Thereby, it can move to the position where chucking of the work W in the previous process can be performed beyond the punch diameter during forging, and the effect is great for difficult-to-shape parts and hot forging machines. As a result, in addition to the opening / closing operation and the 180 ° rotation operation, the opening / closing chucks 12 and 13 can be subjected to various movements such as back-and-forth movement and elevation.

  Note that the operation timing of the front / rear moving cylinder 32 and the lifting / lowering cylinder 33 is taken by a rotary encoder or the like from the side of the main drive motor that drives the crankshaft or the crankshaft that moves the ram back and forth, for example, and control means (not shown) such as a computer ).

  Further, both the forward / backward moving cylinder 32 and the lifting / lowering cylinder 33 may be provided, or any one of them may be provided. Further, in the case where the back-and-forth moving means of the chuck unit B is provided, in addition to the above-described back-and-forth cylinder 31, a back-and-forth moving rod 35 that moves back and forth via a cam drive mechanism 34 that interlocks with the reciprocating motion of the ram as shown in FIG. It is good also as a structure which is provided and the 2nd flame | frame 8B fixed to the front-end | tip by this back-and-forth movement of this back-and-forth moving rod 35 is moved back and forth at a predetermined timing.

  Further, a pendulum movement mechanism 36 for moving the chuck unit B forward with respect to the chuck frame 8 may be provided instead of the back-and-forth moving means or the lifting / lowering means. In this case, as shown in FIG. 7, an intermediate upper portion of the chuck unit B is supported on the chuck frame 8 by a pin 37 so as to be swingable forward, and via a cam drive mechanism 38 interlocked with the reciprocating motion of the ram. A configuration is also possible in which a longitudinally moving rod 39 that moves back and forth is provided, and the chuck unit B abutted on the tip of the longitudinally moving rod 39 is moved forward and downward at a predetermined timing. Also in this case, the pendulum motion mechanism 36 can be provided without difficulty, and the same effects as those obtained when the front-rear moving cylinder 32 and the lifting cylinder 33 are provided can be obtained.

  In addition, a sensor (not shown) for detecting the breakage of the knockout pin or the two bites by the workpiece W biting on the punch is provided, and the servo motor 23 is controlled via the controller based on the two bit detection signal from the sensor. If it is configured to drive and open the open / close chuck, the work W in the previous process falls and can be prevented from hitting twice. In addition, the operator can arbitrarily drive the servo motor 23 to open the open / close chuck, take out the workpiece W in the intermediate process, and check the size and shape of the workpiece W.

  The chuck unit A is a parallel transfer open / close chuck having a servo motor with a ball screw on the upper part (basically, the chuck unit A has the same structure as the chuck open / close mechanism of the chuck unit B, and a description thereof will be omitted). The chuck unit C is an existing open chuck for rotary parallel transfer. Of course, the chuck units A, B, and C can be replaced as needed.

  It is a partially cutaway side sectional view showing an embodiment of the present invention.   It is the same part notch flat sectional view.   FIG. 4 is a partially omitted illustration of the chuck unit according to the present invention.   It is explanatory drawing which shows the clamping state of the chuck unit.   It is a sectional side view of the principal part which shows another embodiment.   It is a schematic sectional side view of the principal part which shows another embodiment.   It is a schematic sectional side view of the principal part which shows another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Forging machine 3 Die block 4 Dies 5 Transfer chuck 8 Chuck frame B Chuck unit 11 Chuck body 12 Opening / closing chuck 13 Opening / closing chuck 14 Support stand 15 Drive shaft 16 First gear 17 Second gear 18 Tube shaft 19 Biasing spring 22 Ball screw 23 Servo motor 24 Linking frame 25 Oscillating connecting plate 26 Oscillating connecting plate 32 Back and forth moving cylinder 33 Elevating cylinder 35 Back and forth moving rod 36 Pendulum motion mechanism

Claims (5)

  A chuck frame is installed on the front of the die block where multiple dies are arranged side by side so that it can swing back and forth in the direction in which the dies are arranged side by side. The transfer chuck in the forging machine is configured to support a support base that pivotally supports a pair of open / close chucks at the bottom of the chuck body in the chuck unit, and the drive shaft for opening and closing the chuck can be moved up and down above the chuck body The lower end of the drive shaft is connected to the chuck via a linkage mechanism, and the chuck is opened and closed by moving the drive shaft up and down, while the drive shaft is placed above the drive shaft at a predetermined timing. Drive means such as a hydraulic cylinder, pneumatic cylinder or servo motor that moves the Transfer chuck in forging machine, characterized in that the.   The upper part of the chuck body supports the drive shaft so that it can move up and down and rotate, and the lower part of the drive shaft supports the center part of the support base so that it cannot rotate but can move in the axial direction. A first gear provided with a pitch circle is provided above the intermediate position in accordance with the trajectory of the chuck unit moving between the dies by reciprocating rocking, and the cylinder shaft having the second gear meshing with the first gear is chucked. The upper support portion of the main body is rotatably supported, and the upper portion of the drive shaft is inserted into the cylindrical shaft so as not to rotate but to be movable in the axial direction. 2. The transfer chuck in a forging machine according to claim 1, wherein the drive shaft is rotated by meshing with the gear to rotate the support base 180 degrees relative to the chuck body.   The drive shaft is normally biased downward to provide an urging means for closing the open / close chuck, and the upper portion of the drive shaft and the ball screw of the servo motor are connected freely via a connecting member to rotate the servo motor. When the ball screw is raised, the drive shaft is lifted against the urging means through the connecting member to release the chuck, and when the ball screw is lowered, the drive shaft is moved with a constant urging force by the urging means. 3. The transfer chuck in the forging machine according to claim 2, wherein an axial play is provided between the connecting member and the ball screw so as to be pushed down to close the chuck.   The chuck frame is provided with a back-and-forth moving means and a lifting / lowering means for moving the chuck unit back and forth and / or raising / lowering at a predetermined timing when the chuck unit moves between dies by reciprocating swinging. The transfer chuck in the forging machine according to claim 2.   3. The forging according to claim 2, further comprising pendulum movement means on the chuck frame side for pendulum movement of the chuck unit forward in accordance with a predetermined timing at which the chuck unit moves between dies by reciprocal swinging. Transfer chuck in the machine.

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