JPS6411371B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a material feeding device for feeding a strip-shaped workpiece to a press.

A typical example of a conventional device of this type is a roller feeder that includes a pair of material feeding rollers.

However, with this roller feeder, it is not possible to eliminate slippage between the pair of feed rollers and the workpiece that is sent to the press through the rollers,
For this reason, roller feeders are not suitable for feeding materials with high precision.

To achieve high precision material feeding, a gripper feeder with movable grips for gripping the workpiece is preferred. The movable grip has a pair of jaws, one jaw being actuated toward the other jaw in cooperation with the other jaw to clamp a workpiece therebetween, and both jaws clamping a workpiece therebetween. In this state, the entire movable grip is moved in the direction of conveyance of the workpiece. Therefore, according to the gripper feeder, there is no slippage between the workpiece and the two jaws that clamp it, and the material can be fed with high precision.

However, in the conventional gripper feeder, since the entire reciprocating motion of the movable grip along the conveying direction is generally provided by a hydraulic cylinder device, it is difficult to adjust the stroke of the hydraulic cylinder device. Although it is possible to easily adjust the amount of material fed by the gripper feeder, it is not suitable for high-speed operation, and for this reason, it has been difficult to feed material at high speed with conventional gripper feeders.

In particular, when a workpiece is to be fed in a staggered manner, so-called zigzag, the movable grip is reciprocated along a movement path toward the press and along a movement path perpendicular to the movement path of the reciprocating movement. It becomes necessary to make a reciprocating motion. For this reason, it is necessary to synchronize the operation of each hydraulic cylinder device that provides reciprocating motion to the movable grip along each movement path, so it is not possible to speed up material feeding with the conventional gripper feeder. .

One of the material supply devices that reciprocates a gripper using a cam mechanism is described in Japanese Patent Publication No. 53-12714 and Japanese Utility Model Publication No. 49-25184. but,
These material supply devices have a structure in which the gripper moves back and forth in one direction, so the material cannot be fed in a staggered manner.

Japanese Patent Publication No. 48-44910 describes an apparatus for processing a material in a staggered manner. This device is
While feeding the material in one direction, the mold is reciprocated in a direction perpendicular to the reciprocating direction of the slide that operates the mold and the direction in which the workpiece material is fed. However, presses using such devices cannot process the workpiece material at high speed and with high precision because the relative positional relationship between the die and the slide changes as the die moves. .

An object of the present invention is to provide a material supply device for a press that can feed materials in a staggered manner at high speed and with high precision.

The present invention provides a base member supported on a frame so as to be reciprocating along a movement path extending in one direction, and a base member supported on the base member so as to be reciprocatable along a movement path extending in a direction transverse to the movement path. a movable grip with a jaw holder; and first and second actuators for reciprocating the base member and the jaw holder, respectively, along their respective paths of motion, each actuator having one end attached to the base member or the jaw holder; a swinging arm connected to a jio holder; and a swinging arm fitted to the swinging arm so as to be relatively slidable in the longitudinal direction of the swinging arm and forming a swinging fulcrum of the swinging arm in the longitudinal direction of the swinging arm. The apparatus is characterized in that it includes an adjustment member that is adjustable and positioned, and a cam mechanism that causes the swing arm to swing around the swing fulcrum.

The features of the invention will become clearer from the following description of the illustrated embodiments.

In FIG. 1, a material supply device according to the present invention is generally indicated by the reference numeral 10, and although not shown, the material supply device is in close proximity to the press in order to supply a strip-shaped workpiece to the press. It is set up as follows.

The feeding device 10 includes a frame 12, a movable grip 14 and a fixed grip 16 for holding the workpiece, both grips 14 and 16 being supported by the frame 12.

The fixed grip 16 is attached to an upper jaw 18 and a lower jaw 2, as shown in FIG.
0. Although not shown, the attenuation yaw 18 is supported by the frame 12 via a conventionally well-known elastic support device. The lower jaw 20 is supported by a jaw holder 22 fixed to the frame 12 so as to be slidable toward the upper arm 18, and receives a spring force toward the upper arm 18 by a spring 24. A connection 28 to a cam mechanism 26 for actuating the upper jaw 18 is provided at the lower part of the upper jaw 18.

The cam mechanism 26 includes a generally circular plate cam 32 fixed to a lateral drive shaft 30 (see FIG. 1) extending in the lateral direction of the frame 12, and a cam follower 34 that engages with the circumferential surface of the cam. Be prepared. The cam follower 34 is rotatably supported by the lower end of a generally rectangular frame member 36, whose upper portion is pivotally connected to the lower portion of the connecting portion 28 via a shaft 38. The frame member 36 is guided in vertical movement by a sliding member 40 that is slidably engaged with the opposing inner surfaces thereof and is fitted onto the shaft 30.
The cam 32 vertically moves a frame member 36 that supports the cam follower via a cam follower 34 engaged therewith, and the movement of the frame member 36 causes the lower jaw 20 to move vertically.

Accordingly, the fixed grip 16 holds the workpiece between the two jaws 18 and 20 in a fixed position while the movable grip 14 releases the workpiece, as is well known in the art. It is activated as expected.

As shown in FIGS. 1 and 3, the movable grip 14 includes a base member 44 that extends perpendicularly to the drive shaft 30 and is slidable on a pair of slide shafts 42 supported by the frame 12. , a pair of slide shafts 4 extending perpendicularly to the extending direction of the slide shafts 42 and supported by the base member 44;
6. The slide axis 42 defines a first path of movement of the base member 44 toward the press, and the slide axis 46 defines a second path of movement of the jaw holder 48 perpendicular to the first path of movement.

The upper jaw 50 and lower jaw 52 are supported on the upper jaw holder 48, as clearly shown in FIG. Atsupajyo 50
Although not shown, is elastically supported by the jog holder 48 via a conventionally well-known elastic support device. Lower Jyo 52 is Jyo holder 48
is provided with a pair of guide portions 56 that are slidably received in a pair of guide holes 54 provided vertically through the upper and lower jaws, whereby the lower jaw 52 slides toward and away from the upper jaw 50. It is possible.

The guide portion 56 is located at the center of each guide portion 56.
A slit 58 extending in the axial direction is provided, and a spring seat member 60 that is loosely fitted across the slit is supported by the holder 48. The lower jaw 5 in relation to the spring seat member 60
A coil spring 62 for applying a downward spring force to the spring 2 is incorporated. A roller 64, which is partially exposed from the lower end of the holder 48, is pivotally attached to the lower end of each guide portion 56.

Below the base member 44, the roller 6
An elevating member 66 is disposed to define the raceway surface of the lower yaw 4 and to push up the lower yaw 52 toward the upper yaw 50 via the roller. The roller 64 rolls on the elevating member 66 as the jaw holder 48 moves relative to the base member 44. The elevating member 66 slidably receives a shaft member 68' extending downwardly from the base member 44.
Therefore, the elevating member 66 can move integrally with the base member 44 along the slide shaft 42, and can also move up and down with respect to the base member 44.

Rollers 68 are rotatably supported at both ends of the elevating member 66. Each roller 68 rolls in the longitudinal direction of the shaft 70 on a flat surface 72 formed on each vibration shaft 70 extending parallel to the slide shaft 42 as the base member 44 moves. Both vibrating shafts 70 swing in opposite directions to each other around the longitudinal center axis of each shaft 70 in order to impart vertical movement to the elevating member 66 via the rollers 68.

As shown in FIG. 4, for example, the device for imparting the above-mentioned rocking motion to the shaft 70 is configured to rotate the shaft 70 near the end of the rocking shaft 70, which is rotatably supported by the frame via a bearing 74. A connecting member 78 connected via a ball joint 76 to
and a generally circular plate cam 80 fixed to the drive shaft 30, and a cam follower 82 that engages with the circumferential surface of the plate cam 80 is pivotally attached to the connecting member 78. The connecting member 78 is provided with a guide groove 86 for slidably receiving a sliding member 84 fitted to the drive shaft 30.
is guided in vertical movement by the sliding member 84. The plate cam 80 reciprocates the connecting member 78 in the vertical direction via a cam follower 82 that engages with the plate cam 80. This movement of the coupling member 78 causes the vibration shaft 70 to swing about its longitudinal axis, and the vibration of the shaft causes
The elevating member 66 moves in the vertical direction to move the lower jaw 52 up and down.

The movable grip 14 therefore moves both jaws 50, 52 while the fixed grip 16 releases its grip on the workpiece, as is well known in the art.
It is operated to clamp the workpiece material between them.

Referring again to FIG. 1, the base member 44 of the movable grip 14 is moved to move the workpiece held by the movable grip 14 toward the press, ie, toward the fixed grip 16. a first actuating device 88 for reciprocating along the first path of motion;
a second actuating device 9 for reciprocating the jog holder 48 along the second movement path;
0 is provided.

The first actuating device 88 is connected to the frame 12.
a longitudinal drive shaft 92 extending in the longitudinal direction of the transverse drive shaft 30 and driven by the transverse drive shaft 30 at the same rotation speed as the transverse drive shaft 30;
The first cam mechanism includes a drum cam 94 fixed to the base member 44 , and a swing arm 98 connected to the base member 44 via a link member 96 .

The link member 96 is connected to the first link member of the base member 44.
are located along the path of motion. Also, the fifth
As shown, the swing arms 98 are arranged with their longitudinal axes at an angle to each other with respect to the link member 96 such that one end of the swing arm 98 is connected to the link member 96 via a pivot axis 100. connected at one end. The other end of link member 96 is connected to mounting portion 104 of base member 44 via pivot 102, as clearly shown in FIG.

As shown in FIGS. 5 and 6, the first cam mechanism has a cam groove 1 of the drum cam 94.
06 is provided. The rocking member 110 is attached to the frame 12, as clearly shown in FIG.
The cam follower 108 is attached to one of the arm portions 110b. It is provided. Therefore, the swinging member 1
10 is a shaft 11 as the drum cam 94 rotates.
It vibrates with a constant amplitude around 2 rotations.

A connecting member 114 for transmitting the above-mentioned swinging motion of the swinging member 110 to the swinging arm 98 is connected at one end to the other arm portion 11 via a pivot 116.
0c, and the other end of the connecting member 114 is connected to the other end of the swing arm 98 via a pivot 118.

As is clear from FIG. 5, the link member 96,
The swing arm 98 and the connecting member 114 constitute a link mechanism, but in order to hold the link mechanism, it is necessary to restrict the movement of the swing arm 98 in the longitudinal direction. Therefore, a control arm 120 is provided as the regulating means. Control arm 120 is positioned along swing arm 98, as clearly shown in FIG. The control arm 120 is swingable about a pivot shaft 122 supported by the frame 12 at one end thereof, and the other end of the control arm 120 is pivotally connected to the pivot shaft 118.

As the regulating means, as shown in FIG. 8, a pair of pins 122 for guiding the connecting member 114 in the longitudinal direction can be used instead of the control arm 120, and each pin 122 is connected to the frame. Supported by

A fork member 124, as shown in FIGS. 7 and 9, is provided in conjunction with the swing arm 98 to provide a pivot point for the swing arm. The fork member 124 has a rotation shaft 128 rotatably supported by a bearing member 126 and receives the swing arm 98 within a recess 130. A guide groove 132 is formed on each side of the swinging arm 98 and extends in the longitudinal direction of the swinging arm, as clearly shown in FIG. The portion 134 protrudes.

A bearing member 126 that supports the rotating shaft 128
is supported so as to be slidable in the vertical direction along a guide portion 136 provided on the frame 12, and the bearing member 126 has a male thread that passes through the member in the vertical direction and is rotatably supported by the frame. An adjustment screw 138 consisting of a member is screwed together. Therefore, by rotating the adjusting screw 138, the bearing member 126 can be adjusted integrally with the fork member 124.
can be moved vertically along the longitudinal direction of the swing arm 98, and as shown in FIG. , the bearing member 126 on which the fork member 124 is rotatably supported can be positioned at a desired height position.

In the first actuating device 88, as described above, when the swinging member 110 swings around the shaft 112 due to the rotation of the drum cam 94, this swinging motion is transmitted to the arm 98 via the connecting member 114. is transmitted to the pivot shaft 118, which causes the swinging arm 9
8 swings around a rotating shaft 128 of the fork member 124. As the swinging arm 98 swings, the base member 44 connected to the swinging arm via the link member 96 reciprocates along the first movement path, and as a result, the movable grip 14 moves. The workpiece is reciprocated generally along the first path of motion to feed the workpiece toward the press.

a movable grip 14 along said first path of motion;
When changing the stroke, the height position of the bearing member 126 is changed by operating the adjustment screw 138 while the swing arm 98 is positioned substantially vertically. By changing the height position of the bearing member 126, the swinging fulcrum of the swinging arm 98, that is, the rotating shaft 128 of the fork member 124 can be moved along the length direction of the swinging arm 98. By changing the swinging fulcrum, the swing width at the one end of the swinging arm 98 can be changed regardless of the constant movement of the connecting member 114 that transmits the movement to the swinging arm 98, and as a result, The stroke of the reciprocating movement of the movable grip 14 along said first path of motion can be varied.

Details of the second actuator 90 are shown in FIGS. 10 and 11, and the first actuator 88 is shown in detail in FIGS.
Components having the same function as in the first actuating device 88 are designated by the same reference numerals with a prime added.

In the second actuating device 90, the swinging arm 9
A link member 96' connected to one end of the link member 8' via a pivot shaft 100' is disposed along the second movement path and comprises a screw assembly whose longitudinal dimension is adjustable. . The other end of the screw assembly 96' is slidably engaged with a guide rod 142 supported by the jaw holder 48 and disposed along the first path of motion, as clearly shown in FIG. do. Therefore, the reciprocating movement of the movable grip 14 along the entire first path of motion is not inhibited by the link member 96'.

At the other end of the swing arm 98', a pair of connecting members 114' arranged parallel to each other are connected to the pivot shaft 1.
18'. Each connecting member 11
4', as shown in FIG. 10, consists of a generally rectangular frame-shaped member with a slot 144 defined therein extending in the longitudinal direction of the member.

A cam mechanism provided in association with the connecting member 114' includes a plate cam 9 fixed to the drive shaft 92.
4', and sliding members 146 fitted to the drive shaft 92, which is the rotation axis of the plate cam, on both sides of the plate cam,
In the example shown in FIG. 11, the plate cam 94' has a boss portion 94'a and a pair of eccentric portions 94'b. The sliding member 146 is slidably received within the slot 144 using the slot 144 as a guide groove, so that the connecting member 114' can slide relative to the sliding member 146 in its longitudinal direction.

Plate cams 9 are provided at both ends of the connecting member 114'.
A roller 148 that can be engaged with the eccentric portion 94'b of 4' is provided. The roller 148 provided at one end of the connecting member 114' is supported by the pivot shaft 118', and the roller 148 provided at the other end of the connecting member 114' is supported by a pivot shaft 150 installed between the connecting members 114'. Supported.

said link member 96' and a swinging arm 9 connected to said link member and angularly disposed thereon;
8' and a connecting member 11 connected to the swing arm.
A control arm 120' for holding the link mechanism constituted by 4' is pivotally connected at one end to the frame 12 via a pivot 122', and at the other end to a pivot 118'.

As the regulating means, as shown in FIG. 12, a pair of pins 122' supported by the frame may be used instead of the control arm 120' to guide the connecting member 114' in its longitudinal direction. can.

A fork member 124' receives the swing arm 98' in a recess 130' so as to be relatively slidable in the longitudinal direction of the swing arm 98' to provide a pivot point for the swing arm 98'. Member 12
6' is rotatably supported. Bearing member 12
6′ is a guide portion 13 provided on the frame 12;
6' (see FIG. 1), and by rotating the adjustment screw 138', the fork member 124' can be moved along the swinging arm 98' in the vertical position. can. Also,
A locking mechanism 140' (see FIG. 1) allows the fork member 124' to be positioned at a desired height.

In the second actuating device 90', when the plate cam 94' is rotated in accordance with the drum cam 94 of the first actuating device 88, the plate cam comes into contact with the plate cam via the roller 148 as the plate cam rotates. Connecting member 11
4' reciprocates in its longitudinal direction with a constant stroke. This movement of the connecting member 114' causes the swinging arm 98' to swing about the axis of rotation 128' of the fork member 124'. This swinging arm 9
8', the Jyo holder 48 connected to the swing arm via the link member 96' moves along the first movement path as in the prior art for staggered feeding of the workpiece material. The base member 44 reciprocates along the second movement path in synchronization with the reciprocating movement of the base member 44 along the second movement path.

The stroke of the reciprocating movement of the jaw holder 48 relative to the base member 44 along said second path of movement is controlled by the operation of said adjusting screw 138', as in the first actuating device 88.
The height can be adjusted to a desired value by changing the height position of the link member 96', and the initial setting position of the jaw holder 48 can be adjusted along the second movement path by adjusting the length dimension of the link member 96'. can.

According to the material supply device 10, each actuating device 88, 90 can be oscillated by operating each adjusting screw 138, 138' without replacing the cams 44, 44' of the first and second actuating device. Arm 12
The swing fulcrum of 4,124' can be made variable,
This allows the reciprocating strokes of the base member 44 and the jaw holder 48 to be varied.

Therefore, the workpiece material can be fed to the press accurately and at high speed in a desired zigzag pattern.

As described above, the present invention provides a base member supported by a frame so that a movable grip can reciprocate along a movement path extending in one direction, and a movement path extending on the base member in a direction transverse to the movement path. and a jio holder supported for reciprocating motion along the base member, and each actuating device for reciprocating the base member and the jio holder includes a swing arm connected at one end to a movable grip, and a swing arm for swinging the swing arm. Since it is equipped with a cam mechanism and an adjustment member that changes the swing fulcrum of the swing arm, it is not only possible to easily adjust the feed rate of the workpiece material, but also to move the workpiece material in a staggered manner at high speed relative to the tool. Moreover, it can be sent with high precision.

[Brief explanation of drawings]

FIG. 1 is a plan view schematically showing the material supply device according to the present invention, and FIGS. 2 to 5 are respectively shown along the lines shown in FIG.
, - is a cross-sectional view taken along the sixth
7 and 7 are cross-sectional views taken along the lines - and - shown in FIG. 5, respectively, and FIG. 8 is a view similar to FIG. 5 showing another embodiment of the invention. Yes, and Fig. 9 shows the line shown in Fig. 7 -
10 is a cross-sectional view taken along the 1st
11 is a cross-sectional view taken along the line XI--XI shown in FIG. 10, and FIG. 12 is a cross-sectional view taken along the line XI--XI shown in FIG. 10 is a drawing similar to FIG. 10 showing another embodiment of the invention. 12: Frame, 14: Movable grip, 88,
90: Actuating device, 96, 96': Link member, 9
4,110,94,146: Cam mechanism, 98,9
8': Swing arm, 114, 114': Connecting member,
124, 124': fork member, 120, 12
0'; 122, 122': Regulatory means, 128, 12
8': Rotation axis.

Claims (1)

[Scope of Claims] 1. A material supply device for staggered feeding of a workpiece material to a press, which comprises a base member supported on a frame so as to be able to reciprocate along a movement path extending in one direction, and a base member supported on the base member. a movable grip having a jig holder supported for reciprocating movement along a path of motion extending in a direction transverse to the path of movement; and a second actuating device, each actuating device including a swinging arm connected at one end to the base member or the Jyo holder, and a swinging arm fitted to the swinging arm so as to be relatively slidable in the longitudinal direction of the swinging arm. and an adjustment member that is adjustable in the longitudinal direction of the swing arm to constitute a swing fulcrum of the swing arm, and a cam mechanism for swinging the swing arm around the swing fulcrum. A material feeding device for the press. 2. The cam mechanism of the actuating device for the base member includes a drum cam and a swinging member having a cam follower that engages with a cam groove of the drum cam, and the swinging member is pivotally mounted to the frame. ,
The material supply device according to claim 1, further connected to the swing arm. 3. The cam mechanism of the actuating device for the Jyo holder includes a plate cam, a sliding member fitted to the rotating shaft of the plate cam, and rollers at both ends that engage with cam surfaces of the plate cam. a connecting member having a guide groove for receiving the sliding member between the ends thereof, one of the rollers being connected to the swinging arm by a pivot. Device.