JP2748309B2 - Material supply device in forging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material supply apparatus for a press forming machine which mainly supplies a long material to a press forming machine such as a bolt former intermittently by a predetermined length.

[0002]

2. Description of the Related Art In general, material supply to a forging machine for forging bolts and other various parts is generally classified into roll feed and grip feed. The material is intermittently gripped by the opposing gripping body, moved straight in one direction in the gripped state, and released at the time of retreat, so that the material is intermittently moved by a predetermined length from the rear side of the machine base to the front forging part. I send it to.

As a specific example of the grip feed mechanism, for example, as shown in Japanese Patent Application Laid-Open No. 2-44267, a moving body that moves forward and backward along a guide rod provided on a frame, A grip for moving a material, comprising: a fixed grip body provided at the front end; and a movable grip body provided at a distal end of a gripping lever pivotally supported by the moving body so as to contact and separate from the fixed grip. And gripping the material moving grip when the moving body advances,
Cam driving means for releasing when the moving body is retracted, the cam driving means having a cam driving shaft having a cam body, a rocker arm swinging in conjunction with the cam body of the cam driving shaft, A swinging lever that abuts on the other end of the gripping lever and biases the gripping lever via a spring in the gripping direction;
The upper end is engaged with the upper surface of the swing lever, and the lower end is provided with a push rod pivotally attached to the rocker arm. Then, when the moving body moves forward, the base portion of the cam body is brought into contact with the rocker arm, whereby the rocker arm swings upward to push up the push rod,
As a result, the push-down of the swing lever by the push rod is released, the swing lever is swung by the spring in the holding direction of the holding lever, and the holding lever is swung in the holding direction. The swinging of the gripping lever causes the movable grip to swing toward the fixed grip, and the movable grip and the fixed grip grip the material. Further, when the moving body is retracted, the bulging portion of the cam body comes into contact with the rocker arm, so that the rocker arm swings downward and pushes down the pressing rod, whereby the swinging lever is moved by the pushing lever. The gripping lever is swung downward in the non-holding direction of the gripping lever against the spring, the pressing of the gripping lever in the gripping direction by the swinging lever is released, and the gripping force of the movable gripping body by the spring is released. It has become.

[0004]

However, in the above-mentioned conventional grip feed mechanism, when the material is gripped between the fixed grip body and the movable grip body, the spring provided on the swing lever is not provided. The structure is such that the gripping lever is urged in the gripping direction via the swinging lever only by the force and thereby the material is gripped by both gripping bodies. Therefore, it is difficult to obtain a large gripping force only with the spring, and as a result, There is a problem that it is necessary to secure a gripping force using a particularly large spring.

SUMMARY OF THE INVENTION An object of the present invention is to provide a grip type material supply apparatus which can obtain a secure gripping force using a small spring without using a particularly large spring.

[0006]

Means for Solving the Problems In order to achieve the above object, the present invention is characterized in that it is configured as follows.

That is, the present invention provides a moving body that moves forward and backward along a guide rod provided on a frame, a fixed grip body provided on the moving body, and a grip that is pivotally supported by the moving body. A material moving grip provided at a distal end portion of a lever and having a movable gripping body that comes into contact with and separates from the fixed gripping body; and grips the material moving grip when the moving body moves forward and releases when moving backward. And a cam drive means for supplying a long material to the forging section intermittently by a predetermined length, wherein the cam drive means comprises a cam drive shaft having a cam body. And a parallel quadruple link mechanism that swings in conjunction with the cam body, the parallel quadruple link mechanism comprising: a fixed member fixed to the frame; Moving body at the end It comprises a rail body that supports regardless of the moving position and swings the gripping lever in the gripping direction, and a pair of parallel links that respectively connect both ends of the rail body and the fixed member. Of which, one link is provided with an extension extending outward,
The extension is urged toward the cam body by a spring, and the cam drive shaft engages the bulging portion of the cam body with the extension when the moving body retreats to move the rail body. The grip lever is brought closer to the fixed member side in the non-grip direction, and the base of the cam body is opposed to the extended portion when the moving body advances, and the rail body is gripped by the spring from a position close to the fixed member by the spring. The lever is separated in the gripping direction, and the material is gripped by the movable gripping body and the fixed gripping body of the gripping lever near the top dead center position in the movement trajectory of the rail body.

[0008]

According to the above construction, when the moving body advances, the extension of the one side link of the parallel quadruple link mechanism faces the base of the cam body in the cam driving means, and the link is formed by the spring. Swings in the direction in which it rises with respect to the fixing member. As a result, the rail that constitutes the parallel quadruple link mechanism together with the link moves in the direction away from the fixed member, and the grip lever is swung in the gripping direction by the rail. The swinging of the gripping lever causes the movable grip to swing toward the fixed grip, and the material is gripped by the movable grip and the fixed grip. In this case, especially when the rail body of the parallel quadruple mechanism is located near the top dead center position in the movement locus, the material is gripped by the movable grip and the fixed grip, so the parallel quadruple link mechanism has Due to the so-called crank characteristic, it is possible to exert a large striking force on the rail near the top dead center of the rail where both grips grip the material. As a result, even if the spring force is small, it is possible to apply a large pressing force to the gripping lever in the gripping direction near the top dead center position of the rail body, and to apply a large gripping force to both grips. It becomes possible. Therefore, when the moving body moves forward, it is possible to reliably feed the material by a predetermined length in a state where the material is securely gripped by both grip bodies.

When the movable body is retracted, the extension of the one side link engages with the bulge of the cam body in the cam driving means, and the link falls down against the fixed member against the spring. Rocked in the direction. As a result, the rail in the parallel quadruple link mechanism is moved in a direction approaching the fixed member, and the urging of the gripping lever in the gripping direction by the rail is released. As a result, the gripping of the material by the movable gripping body and the fixed gripping body via the gripping lever is released, and the moving body and the material moving grip can be retracted while the material remains at the moving position.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic plan view of a press forming machine provided with a material supply device according to the present invention. A die block 3 is disposed at a predetermined position of a machine base 2 in the press forming machine 1. The die block 3 is provided with a plurality of forging dies 4... On the front surface of the ram 5 mounted on the machine base 2 in front of the die block 3, the same number of forging punches 6... 6 as the forging die 4 are held so as to face each forging die 4. A plurality of forging stations are formed, and the rear end of the ram 5 is connected to a crankshaft 9 integrated with a flywheel 8 rotated by a drive motor 7 of the forging machine 1 via a connecting member 10. The connection allows the ram 5 to move back and forth toward the die block 3.

A material A is provided beside the die block 3.
And a cutter (not shown) for cutting the material A supplied from the quill 11 into a predetermined size is provided. Have been. At the back of the machine base 2 behind the material supply quill 11, a material supply means 20 comprising a grip feed mechanism for intermittently supplying a material A made of a wire to the quill 11 by a predetermined length is provided. Have been. Further, on the die block 3, there is provided a chuck transfer means 12 having a material transfer chuck (not shown) for transferring the material A between a plurality of forging stations. 4, a knock-out pin means 13 for pushing out the material A driven by the forging punches 6... 6 from the inside of the forging dies 4. .

As the driving means for the material supply device 20, the chuck transfer means 12, and the knockout pin means 13, the rotational power of the crankshaft 9 for reciprocating the ram 5 is transmitted via parallel link type rotating mechanisms 14, 14. To the pin drive shaft 15 of the knockout pin means 13,
The rotational power of the pin drive shaft 15 is transmitted to a chuck opening / closing shaft 17 of the chuck transfer means 12 and a cam drive shaft 18 of the material supply device 20 via a chain transmission mechanism 16. Thus, the material supply device 20, the chuck transfer means 12, and the knockout pin means 13 are driven in synchronization with the movement of the ram 5.

The material supply device 20 is, as shown in FIG.
And a frame 21 having a frame shape as shown in FIG.
Material stopping grip 22 provided on the
A moving body 25 that moves forward and backward along a pair of guide rods 23 and 24 provided on the moving body 25, a material moving grip 26 provided on the moving body 25, and the moving body 25 reciprocates a predetermined stroke. Cam driving means 30 for opening and closing the grips 22 and 26 alternately so that the material moving grip 26 is released when the moving body 25 retreats and the material stopping grip 22 is released when the moving body 25 advances. I have.

As shown in FIGS. 4 and 5, the movable body 25 is slidably supported by a pair of guide rods 23 and 24 having a circular cross section and an oval shape supported by a frame 21. The moving body 25 includes three rollers 25a to 25c that roll along the upper and lower surfaces of one of the oval guide rods 24, and the moving body 25 is centered on the axis of the other guide rod 23 by the rollers 25a to 25c. To prevent rotation. The free ends of the rollers 25a to 25c are rotatably connected and supported by a triangular reinforcing plate 25d. Therefore, the moving body 25 is
It is guided and supported so as to advance and retreat linearly along 3 and 24.

As shown in FIGS. 5 and 8, the moving body 25 is provided with a spring 27 between the front part of the moving body 25 and the frame 21 for urging the moving body 25 rearward. And a receiving roller 28 is provided at the rear. The moving body 25 is reciprocated by the cam driving means 30 via the link mechanism 31, and the link mechanism 31 has a moving amount adjusting mechanism 32 for adjusting the moving amount of the moving body 25 as shown in FIG. Is provided.

The cam driving means 30 has a cam driving shaft 18 having first to third cams 34 to 36, as shown in FIG.
It is driven by the rotational power of.

As shown in FIGS. 5 and 7, the link mechanism 31 is supported by the frame 21 so that a swing arm 37 extending in the vertical direction rotates about a support shaft 37b.
The arm 37 has a pair of opposing arm pieces 37a, 37a.
7a, an intermediate portion of which is supported by the support shaft 37b, and the first cam 34 between the support shaft 37b and the upper end portion.
And a rolling wheel 39 that engages with the cam surface of the camshaft. A compression spring 38 is provided at the lower end of the swing arm 37, and biases the swing arm 37 in a counterclockwise direction to rotate the rolling wheel 39 to the first position.
It works so as to always engage with the cam 34. The rotation of the first cam 34 causes the swing arm 3 to rotate.
7 swings back and forth by a predetermined rotation angle between a forward position shown by a solid line in FIG. 5 and a retreat position shown by a virtual line.

One end of an intermediate arm 40 extending in the horizontal direction is connected to the upper end of the swing arm 37.
The lower end of an adjustment lever 41 that extends in the up-down direction and has a contact surface 41a that contacts the receiving roller 28 of the moving body 25 is connected to the other end of the zero. The upper end of the adjusting lever 41 is provided with a sliding member 42 that can move up and down of the moving amount adjusting mechanism 32.
Through a pivot 43.

As shown in FIG. 7, the sliding member 42 is a support member 2 provided on the frame 21 so as to be slidable in the vertical direction.
1a, and screwed to a screw shaft 44 rotatably supported by the support member 21a. Screw shaft 4
4 is connected to a drive motor 45 disposed above the support member 21a via a speed reduction mechanism 46.
By rotating the screw shaft 44 and moving the adjustment lever 41 in the vertical direction together with the sliding body 42, the height of the swing fulcrum of the adjustment lever 41 can be changed up and down. With this adjustment, the contact surface 4 of the adjustment lever 41
The contact position between the roller 1a and the receiving roller 28 is changed, so that the stroke amount of the moving body 25 caused by the swing of the adjustment lever 41 can be changed arbitrarily. Can be changed arbitrarily.

In the embodiment shown in the drawings, as is clear from FIGS. 5 and 6, a contact surface 41a provided on the adjustment lever 41 is provided.
However, it is formed in a curved shape such that the front dead center of the receiving roller 28 due to the swinging of the adjusting lever 41 is always at a constant position even when the height position of the sliding body 42 is changed. That is, the stroke amount can be adjusted so that the forward end of the moving body is always at a fixed position and the position of the backward end is changed.

Thus, the stroke amount of the moving body 25 is adjusted using the connecting link mechanism including the swing arm 37, the intermediate arm 40, and the adjustment lever 41, so that the adjustment is performed with high accuracy. Further, since the rolling wheel 39 is provided between the support shaft 37b of the swing arm 37 and the upper end connecting portion of the intermediate arm 40, the upper end connecting from the rolling wheel 39 serving as the point of force to the operating point. The length up to the portion can be set short, and the deflection of the swing arm 37 can be suppressed. As a result, a change in the stroke amount of the moving body 25 with respect to the lift amount of the first cam 34 can be suppressed to be small, and fine adjustment of the stroke amount of the moving body 25 can be performed accurately.

As shown in FIG. 4, the material moving grip 26 includes a fixed grip 47 fixed to the upper surface of the moving body 25 and extending in the front-rear direction, and a support piece 25e on the upper part of the moving body 25 as shown in FIG. , 25f provided at the distal end of a gripping lever 48 pivotally supported via a swing, and a movable grip body 49 approaching and separating from the fixed grip body 47. The material moving grip 26 is moved by the third cam 36 of the cam drive shaft 18 and the parallel quadruple link mechanism 50 which swings in conjunction with the cam 36.
The gripping operation is performed when the robot moves forward, and the releasing operation is performed when the robot moves backward. An idler roller 48a is provided at the rear end of the gripping lever 48, and a spring that constantly urges the lever 48 in the non-gripping direction is provided between the lever 48 and the moving body 25. 48b are interposed. Further, the material receiving surface of the fixed grip body 47 has a V extending in the front-rear direction.
A receiving groove is formed.

As shown in FIG. 9, the parallel quadruple link mechanism 50 includes a horizontally extending fixing member 51 fixed to the frame 21 and the gripping lever 4 parallel to the fixing member 51.
A rail 52 for swinging the gripping lever 48 in the gripping direction of the gripping lever 48 while allowing the gripping lever 48 to move in the longitudinal direction of the guide rods 23 and 24 by contacting the idler roller 48a of It comprises a pair of parallel links 53 and 54 for connecting both ends of the rail 51 and the rail 52 respectively. One of the parallel links 53 and 54
Is provided with a rolling wheel 55 whose lower end is extended downward and which is engaged with the third cam 36 at an intermediate portion of the extended portion 53a.
A compression spring 56 is provided at the lower end of the link 53, and the compression spring 56 urges the link 53 in a counterclockwise direction so that the rolling wheel 55 comes into contact with the cam surface of the third cam 36. To act on.

When the moving body 25 moves forward, the rolling wheel 5 of the one side link 53 of the parallel quadruple link mechanism 50 is moved.
5 is opposed to the base 36a of the third cam 36 in the cam driving means 30, the engagement between the rolling wheel 55 and the third cam body 36 is released as shown by a solid line in FIG. It swings in the counterclockwise direction standing on the member 51. Thereby, the rail body 52 is fixed to the fixing member 51.
The gripping lever 48 is swung in the gripping direction by the rail 52 via the idler roller 48a. The swing of the gripping lever 48 causes the movable grip body 49 to swing toward the fixed grip body 47, and the material X is moved by the movable grip body 49 and the fixed grip body 47.
Will be grasped. In this case, especially when the rail body 52 of the parallel quadruple link mechanism 50 is located near the top dead center position in the movement locus, the material X is gripped by the movable grip body 49 and the fixed grip body 47. Due to the so-called crank characteristic of the parallel quadruple link mechanism 50, a large projecting force can be applied to the rail body 52 near the top dead center position of the rail body 52 where the grip bodies 47 and 49 grip the material. Becomes As a result, even if the spring force of the spring 56 is small, a large pressing force in the gripping direction can be applied to the grip lever 48 near the top dead center position of the rail body 52, and the two grip bodies 47, 49 Can be given a large gripping force. Thus, when the moving body 25 moves forward, both grip bodies 4
The material X can be reliably fed for a predetermined length in a state where the material X is securely grasped by 7, 49.

On the other hand, when the moving body 25 is retracted, the rolling wheel 55 of the one side link 53
6b, the link 53 swings clockwise so that the link 53 falls down with respect to the fixed member 51. As a result, the rail body 52 moves downward in the vicinity of the fixing member 51,
The urging of the grip lever 48 in the grip direction by the rail body 52 is released. As a result, the gripping lever 48
b, the gripping by the movable grip body 49 and the fixed grip body 47 is released by being urged in the non-grip direction, and the moving body 25 and the material moving grip 26 are retracted while the material X remains at the moving position. It becomes possible.

An adjusting means 57 for adjusting the spring force of the spring 56 is provided. As shown in FIGS. 3 and 9, the adjusting means 57 includes a rod 58 whose base is pivotally supported at the lower end of the one side link 53, an adjusting body 60 which externally supports the distal end of the rod 58, and a rod The compression spring 56 is interposed between the base portion 58 and the adjusting body 60.
The adjusting body 60 includes a first split adjusting body 61 and a second split adjusting body 62.
Screw portions 61a and 62a that can be screwed into the mounting screw holes 63 formed in the frame 21, respectively, are formed on the outer circumferences of the two adjusting members 61 and 62, respectively. , 62 are plural connecting screws 6
4 are connected at a predetermined interval. First
A hexagonal head 61b smaller than the outer diameter of the screw portion is formed at the outer end of the split adjustment body 61. Thus, when adjusting the spring force of the compression spring 56, the frame 2
First and second split adjusters 6 connected from outside of the first split adjuster 6
The screws 1 and 62 are screwed into the mounting screw holes 63 at the same time, and the amount of compression of the compression spring 56 is changed to adjust the spring force. In this case, the adjustment body 60 can be easily adjusted from the outside of the frame 21, and the hexagonal head 61 b provided at the outer end of the first adjustment body 61 and having a smaller outer diameter than the first adjustment body 61 has Since it only protrudes outward, it requires little space, and when performing an adjustment operation, it can be easily operated using a small tool even in a small space. In addition, the adjusting body 60 is divided into a first split adjusting body 61 and a second split adjusting body 62, and both of these adjusting bodies 61,
6 comprises a plurality of connecting screws 64 for connecting
After the adjusting body 60 is screwed to a predetermined position via the square head, a plurality of connecting screws 64 are screwed in to narrow the gap between the two split adjusting bodies 61 and 62, thereby making the two adjusting bodies 6
The first and second outer thread portions 61 a and 62 a are engaged with the screw holes 63 of the frame 21 to prevent loosening.

On the other hand, the material fixing grip 22 is shown in FIG.
As shown in FIG. 7, a grip having a fixed grip body 65 provided on a support member 66 fixedly provided on the upper surface of the frame 21 and a movable grip body 67 pivotally supported by the support member 66 and opposed to the fixed grip body 65. Lever 68 and frame 2
And a swing mechanism 70 pivotally supported by a mounting member 66a erected on the upper part of the first unit 1 and swinging the gripping lever 68 up and down.

The swing mechanism 70 has a second cam 35 provided on the cam drive shaft 18 as shown in FIGS. 3 and 10, and extends horizontally below the cam 35, and one end thereof is connected to the frame 21. A swing arm 73 having a rolling wheel 72 rotatably supported by a support shaft 71 and abutting on the second cam 35.
And a connecting rod 74 pivotally attached to an intermediate portion of the arm 73 via a spherical bearing 74a and extending in the vertical direction, and one end is connected to an upper end of the connecting rod 74 via a spherical bearing 74b. A swinging member 75 pivotally supported by a mounting member 66a above the gripping lever 68, a rod 76 having a lower end pivotally attached to the gripping lever 68 and an upper end supported by the support member 66 so as to be vertically movable; It has. The tip of the swing arm 73 is attached to the swing arm 73.
73a and a pull-up rod 73b for urging the
Is provided, and the rod 7
6, the other end of the swing member 75 is loosely inserted, and a spring 78 is interposed between the upper surface of the other end of the swing member 75 and the upper end of the rod 76 via washers 77, 77. Is equipped.

In FIG. 10, reference numeral 75 denotes an opening spring for releasing the grip lever 68, and a spring weaker than the spring force of the spring 78 is used.

When the moving body 25 is retracted, the rolling wheel 72 of the swing arm 73 engages with the bulging portion 35b of the second cam 35 as shown by the solid line in FIG. Is pivoted clockwise against the spring 73a so that the connecting rod 7
The swing member 75 is swung in the counterclockwise direction via 4.
As a result, the spring 78 is compressed via the washer 77, and the rod 76 is lifted up with respect to the support member 75 by this compression force. The lifting force of the rod 76 acts on the gripping lever 68 to swing the gripping lever 68 in a counterclockwise direction so that the movable grip 6
7 and the fixed grip 65 hold the material.

On the other hand, when the moving body 25 moves forward, the rolling wheel 72 of the swing arm 73 faces the base 35 a of the second cam 35. As a result, the swing arm 73 is swung counterclockwise by the spring 73a, and the swing member 75 is swung clockwise through the connecting rod 74. Therefore, the compressed spring 78 extends until the washer 77 is pressed down and comes into contact with the step portion 76 a of the rod 76. As a result, the action of the spring force of the spring 78 urging the gripping lever 68 in the gripping direction is eliminated, and the movable grip 67 and the fixed grip 6 of the gripping lever 68 are removed.
5 is released.

The material moving grip 26 and the material stopping grip 22 are provided with supply stopping devices 80 and 81, respectively, for forcibly stopping the supply of the material at the start of operation or during operation of the heading machine. Have been.

The supply stopping device 80 provided on the material moving grip 26 is for keeping the movable grip member 49 released from the fixed grip member 47.
9, the lower end of the other side link 54 in the parallel quadruple link mechanism 50 extends downward as shown in FIG. 9, and the roller 82 provided in the extension and the lower position of the roller 82 in the frame 21. Opposed roller 8 provided in
3 and the two rollers 82, 8 provided on the frame 21.
Cylinder 85 having a stop block 84 which can be extended and retracted between the three
And When the supply of the raw material X is stopped during the operation of the head forming machine 1, for example, the cylinder 8
5 and the stop block 84 is moved to the rollers 82, 8
3 and the other side of the parallel quadruple link mechanism 50 is swung clockwise. As a result, the rail body 52 is lowered, the urging of the gripping lever 48 in the gripping direction is released, and the gripping lever 48 is pivoted counterclockwise by the spring 48b to release the material X held by the movable grip 49. Upon release, the released state is maintained.

On the other hand, a supply stopping device 81 provided on the material stopping grip 22 is for maintaining the movable grip 67 in a gripping state with respect to the fixed grip 65, and the supply stopping device 81 is, as shown in FIG. A roller 86 provided at an upper end of the swing member 75 at one end thereof;
And the opposite roller 87 provided at a position above the roller 86, and fixed to the frame 21.
6 and 87, a cylinder 89 having a stop block 88 that can move back and forth. Then, when only the supply of the raw material X is stopped during the operation of the operation of the head forming machine, the cylinder 89 is operated to insert the supply stop block 88 between the rollers 86 and 87, and the swing member 75 is moved. Forcibly swing counterclockwise. This allows the spring 78
Is compressed, the rod 76 is lifted, and the grip lever 6
8 is rocked in the counterclockwise direction, and the material X is gripped by the movable gripping body 67 of the gripping lever 68.
The holding state is maintained.

[0036]

As described above, according to the present invention, the moving body that moves forward and backward along the guide rod of the frame, the material moving grip provided on the moving body, and the moving body that is gripped when the moving body advances. A cam drive means for releasing when retracted, the cam drive means comprising a cam drive shaft having a cam body and a parallel quadruple link mechanism swinging in conjunction with the cam body, and When the moving body retreats, the parallel quadruple link mechanism is shortened and rocked into a diamond shape to operate the material moving grip to be in the released state, and when the moving body moves forward, the parallel quadruple link mechanism is allowed to extend by the spring. In addition, since the material moving grip is operated so as to be in a gripping state near the top dead center position where the parallel quadruple link mechanism has a square shape, when the moving body moves forward, one of the parallel quadruple link mechanisms is used. Side link The extension portion is opposed to the base portion of the cam body in the cam driving means, and the link swings in a direction in which the link stands up with respect to the fixed member, whereby the rail body is moved in a direction away from the fixed member. The gripping lever is swung in the gripping direction by the rail, and the swinging of the gripping lever causes the movable grip to swing toward the fixed grip so that the material can be gripped by the movable grip and the fixed grip. . In this case, especially when the rail body of the parallel quadruple mechanism is located near the top dead center position in the movement locus, the material is gripped by the movable grip and the fixed grip, so the parallel quadruple link mechanism has Due to the so-called crank characteristic, it is possible to exert a large striking force on the rail near the top dead center of the rail where both grips grip the material. As a result, even when the spring force is small, it is possible to apply a large pressing force to the gripping lever in the gripping direction near the top dead center position of the rail body, and it is possible to apply a large gripping force to both grips. Becomes Therefore, when the moving body moves forward, the material can be reliably fed for a predetermined length in a state where the material is securely gripped by both grip bodies.

When the moving body is retracted, the extension of the one side link engages with the bulging portion of the cam body in the cam driving means, and the link swings in the direction in which it falls down with respect to the fixed member. Then, the rail body is moved in the direction approaching the fixing member, and the urging of the grip lever by the rail body in the gripping direction is released. Thereby, the urging by the grip lever is released, the grip by the movable grip body and the fixed grip body is released, and the moving body and the material moving grip can be retracted while the material remains at the moving position.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a pressure forming machine to which a material supply device of the present invention is applied.

FIG. 2 is a side view showing a power transmission mechanism from a pin drive shaft of a knockout pin means to a chuck transfer means and a material supply device.

FIG. 3 is a schematic front view of a material supply device.

FIG. 4 is a longitudinal sectional side view of a moving body having a material moving grip.

FIG. 5 is a vertical sectional side view of a cam driving means for moving the moving body forward and backward.

FIG. 6 is a longitudinal sectional front view of the cam driving means when the stroke of the moving body is changed.

FIG. 7 is a vertical sectional side view of a moving amount adjusting means of the moving body.

FIG. 8 is a plan view in which a part of a material moving grip is omitted.

FIG. 9 is a front view of a main part showing a driving mechanism of a material moving grip.

FIG. 10 is an enlarged side view showing a drive mechanism of a movement stopping grip.

[Description of Signs] 20 Material supply device 18 Cam drive shaft 21 Frame 23, 24 Guide rod 25 Moving body 26 Material moving grip 30 Cam driving means 47 Fixed grip body 48 Gripping lever 49 Movable grip body 50 Parallel quadruple link mechanism 51 Fixing member 52 Rail body 53, 54 Link 53a Extension 56 Spring

Claims (1)

(57) [Claims] 1. A moving body that moves forward and backward along a guide rod provided on a frame, a fixed grip body provided on the moving body, and a distal end portion of a grip lever pivotally supported by the moving body so as to be swingable. A grip for moving a material provided with a movable grip body which comes into contact with and separates from the fixed grip body, and a cam driving means for gripping the grip for moving the material when the moving body moves forward and releases when the moving body retreats A material supply device in a forging machine that intermittently supplies a long material to a forging section by a predetermined length, wherein the cam driving means includes a cam driving shaft having a cam body, and the cam A parallel quadruple link mechanism that swings in conjunction with the body, the parallel quadruple link mechanism comprising: a fixing member fixed to the frame;
A rail body that supports the rear end of the grip lever in parallel with the fixing member regardless of the moving position of the moving body, and swings the grip lever in the gripping direction; and both ends of the rail body and the fixing member And a pair of parallel links connecting each of the two links, and one of the parallel links is provided with an extension extending outward, and the extension is urged toward the cam body by a spring. And, the cam drive shaft engages the bulging portion of the cam body with the extending portion when the moving body retreats to bring the rail body close to the fixed member side in the non-gripping direction of the gripping lever, When the moving body moves forward, the base portion of the cam body is opposed to the extending portion to move the rail body away from a position close to the fixing member in the gripping direction of the gripping lever, and a top dead center in the movement locus of the rail body Near the position Material feeding device in the forging molding machine, characterized in that to grip the material by the movable gripping body of the lever and the fixed gripping member.