JP2004141928A - Material feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a material feeder to easily adjust the clamping force according to the thickness of a material to be used. <P>SOLUTION: Gripper devices 4 and 7 clamp and unclamp a material by fixed grippers 2 and 5 and movable grippers 3 and 6 supported by shafts 28 and 29 at a predetermined timing, and the fixed gripper 2 is reciprocally movable along the shafts 28 and 29 together with the movable gripper 3. The shafts 28 and 29 are supported in a vicinity of both ends thereof by a wall portion of a housing 16 via eccentric flanges 50-53. A synchronous rotating device to vertically move the shafts 28 and 29 by synchronously rotating the eccentric flanges 50-53, and to displace the material clamping units of the fixed grippers 2 and 5 in an advancing/retractable direction to/from the material clamping units of the movable grippers 3 and 6 is provided. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a material feeder that intermittently feeds a material such as a plate or a wire to a working machine such as a press machine by a fixed amount, and particularly to a small component such as a terminal and a lead frame used in the electronic component industry. The present invention relates to a material feeding device suitable for feeding into a press machine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a device for feeding a material such as a plate material or a wire material to a working machine such as a press machine, the material is arranged so as to be reciprocally slidable along a material transfer path, and is clamped (gripped) by a first fixed gripper and a first movable gripper. ) And unclamping (release), and a second fixed gripper and a second movable gripper arranged at a position downstream of the first gripper device in the material transfer direction. A second gripper device configured to clamp and unclamp the material, wherein the movement of the first movable gripper and the second movable gripper and the reciprocal sliding of the first gripper device occur at a predetermined timing, and Is known that causes intermittent feed (for example, see Patent Documents 1 and 2).
[0003]
In such an apparatus, the first fixed gripper and the first movable gripper, and the second fixed gripper and the second movable gripper, in order to appropriately maintain the clamping force or gripping force when clamping the material, the first fixed gripper and the first movable gripper, It is necessary to adjust the distance between the first movable gripper and the distance between the second fixed gripper and the second movable gripper for each material in accordance with the thickness of the material. For example, if a material having a thickness of 4 mm is to be fed with the above-mentioned interval adjusted to a material thickness of 2 mm, the gripping force is too strong and the material is crushed.
[0004]
As a conventional method for adjusting the above-mentioned interval in such an apparatus, spacers of various thicknesses corresponding to the material thickness are prepared in advance, and first and second spacers suitable for the material to be used are prepared. There is a method of inserting into a second fixed gripper (for example, see Non-Patent Document 1).
There is also a device in which an adjustment knob is provided on the top of the first and second fixed grippers, and the interval can be adjusted only by rotating the adjustment knob (for example, see Non-Patent Document 1).
[0005]
[Patent Document 1]
JP-A-135430
[Patent Document 2]
Japanese Patent Publication No. 5-17141
[Non-patent document 1]
Catalog of Sankyo Manufacturing Co., Ltd., “Variax J0903”, published in October 2000, page 68
[0006]
[Problems to be solved by the invention]
In the prior art using the above-mentioned spacers, it is necessary to prepare and manage a number of types of spacers and fine-tune the spacer thickness several times until optimal conditions are obtained for the materials used. And there is a problem that it takes time to obtain the optimum conditions.
Further, in the related art provided with the above-described adjustment knob, since the screw mechanism and the like need to be provided in the first and second fixed grippers, the gripper device tends to be large. In recent years, there has been an increasing demand for a high-speed material feeder of this type every year, but an increase in the size of the gripper device is accompanied by an increase in inertial load, which is a factor that hinders the response to the high-speed operation. .
[0007]
The present invention solves the above-described problems of the prior art, can easily adjust the clamping force according to the plate thickness, does not increase the inertial load of the gripper device, and can sufficiently increase the speed. It is an object of the present invention to provide a material feeder that can respond.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, a material feeding device according to the present invention is configured to perform clamping and unclamping of a material by a first fixed gripper and a first movable gripper, and the first fixed gripper includes a material transfer path. A first gripper device slidably supported by a pair of shafts arranged along the axis, and a second fixed member arranged at a downstream or upstream position in the material transfer direction with respect to the first gripper device. A second gripper device configured to perform clamping and unclamping of the material by the gripper and the second movable gripper, and a second gripper device having a second fixed gripper supported by the pair of shafts; A material feeding device configured to cause the movement of the second movable gripper and the reciprocating sliding of the first gripper device at a predetermined timing to cause intermittent feeding of the material. In addition, an eccentric flange is provided near each end of each shaft to support each shaft, and each eccentric flange is provided on an inner peripheral surface rotatably fitted to each shaft and a wall portion of a housing of a material feeding device. The eccentric flange has the same amount of eccentricity, is mounted eccentrically in the same direction with respect to each axis, and is further mounted on each eccentric flange. A direction in which the material clamp portions of the first fixed gripper and the second fixed gripper are separated from and brought into contact with the material clamp portions of the first movable gripper and the second movable gripper by rotating the flange in synchronization with the housing and each axis. Characterized in that a synchronous rotation device for displacing the motor is provided.
[0009]
The first fixed gripper has a sliding block, the sliding block is slidably fitted to the pair of shafts, and the second fixed gripper has an adjustment block, It is preferable to adopt a configuration in which an adjustment block is fitted on the pair of shafts.
[0010]
In addition, when such a configuration is adopted, the first movable gripper slides on the sliding block so as to be able to displace the material clamp portion in a direction of separating from and coming into contact with the material clamp portion of the first fixed gripper. It is preferable that the second movable gripper is held by the adjustment block so as to be displaceable in a direction in which the material clamp portion of the second movable gripper is separated from and brought into contact with the material clamp portion of the second fixed gripper.
[0011]
Function and effect of the present invention
The material feeder of the present invention operates the synchronous rotation device to synchronously rotate the respective eccentric flanges by a predetermined angle so that the distance between the material clamp portion of the first fixed gripper and the material clamp portion of the first movable gripper is increased. The distance between the material clamping portion of the second fixed gripper and the material clamping portion of the second movable gripper can be made appropriate according to the thickness of the material, and the clamping force can be appropriately adjusted. As described above, the adjustment of the clamping force can be performed extremely easily only by operating the synchronous rotation device, and the adjustment of the clamping force of the first gripper device and the second gripper device can be performed simultaneously. Adjustment work time can be significantly reduced.
This material feeder mounts eccentric flanges near both ends of a pair of shafts, which are members necessary to support the first fixed gripper and the second fixed gripper, and synchronously rotates the eccentric flanges. It has only a rotating device. As described above, the pair of shafts, which are originally necessary for other purposes, are used as a part of a mechanism for adjusting the clamping force, and only a few elements are added thereto. Therefore, the size of the gripper device is not increased. Therefore, it is possible to sufficiently cope with high-speed operation without increasing the inertial load.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the material feeder 1 has a first fixed gripper 2 and a first movable gripper 3, and performs a first gripper device 4 for clamping (gripping) and unclamping (releasing) the material. And a second gripper device 7 having a second fixed gripper 5 and a first movable gripper 6 for clamping and unclamping a material, and for intermittent feeding operation to a working machine such as a press device. The material is supplied by First, a basic operation of the material feeding device 1 will be described with reference to FIG.
[0013]
As shown in FIG. 10A, in the material feeding device 1, first, (1) the first gripper device 4 clamps the material 8, and (2) the second gripper device 7 unclamps the material 8. Subsequently, as shown in FIG. 3B, (3) the first gripper device 4 moves in the feed direction of the material 8 (to the right in the figure), thereby causing the first fixed gripper 2 and the first movable gripper 3 to move. The clamped material 8 is sent to a press device 9. Next, (4) as shown in FIG. 4C, after the second gripper device 7 clamps the material 8, (5) the first gripper device 4 unclamps the material 8. Thereafter, (6) the first gripper device 4 moves in the return direction (leftward in the figure) and returns to the original position, as shown in FIG.
[0014]
By repeating the series of operations (1) to (6), the material 8 can be intermittently supplied to the press device 9 (the mold 10). The first gripper device 4 has a sliding block 11 (not shown in FIG. 10) disposed so as to be able to reciprocate with respect to the transfer direction of the material 8, and by moving the sliding block 11, The reciprocating operation (feed and return) of the first gripper device 4 is performed.
[0015]
Next, the specific configuration and operation of each unit of the apparatus will be described.
In order to make the first gripper device 4 and the second gripper device 7 perform the above-described predetermined operation, the material feeding device 1 includes three cams (which are sequentially fixed to the input shaft 30 as shown in FIGS. 1 and 8). A cam device having a first cam 12, a second cam 13, and a third cam 14) is provided. The input shaft 30 is mounted on the housing 16 of the device via the bearing members 15 and 15a, and is continuously driven to rotate in one direction. For example, rotation is transmitted from the crankshaft of the press device to the input shaft 30 at a predetermined timing, and the present device 1 is operated in synchronization with the press device.
[0016]
The first cam 12 is a roller gear cam having tapered ribs formed on the peripheral surface, and having cam surfaces on both side surfaces of the tapered ribs. The second cam 13 and the third cam 14 fix the clamp positions of the movable grippers 3 and 6 near the material clamps of the fixed grippers 2 and 5 and the material clamps of the movable grippers 3 and 6. The movable grippers 3 and 6 are configured as a plate cam having a cam surface of a predetermined shape so as to move the movable grippers 3 and 6 between the grippers 2 and 5 and an unclamping position separated from the material clamping portion.
[0017]
In addition, the operations necessary for feeding the material 8 (the reciprocating operation of the first gripper device 4, the clamp / unclamp operation of the first gripper device 4, and the third operation) are performed by the three separate cams 12, 13, and 14. The reason why the clamp / unclamp operation of the two-gripper device 7 is performed is to make it easy to design the timing of these components (each operation).
[0018]
The first gripper device 4 has a sliding block 11. The sliding block 11 is slidably supported by a pair of shafts 28 and 29 arranged along the material transfer path, and is slidable along the material 8 transfer path. 3 and 7, the first movable gripper 3 is slidably held by the sliding block 11, and the material clamp portion 3a of the first movable gripper 3 is connected to the first fixed gripper. 2 material clamp portion 2a.
[0019]
As shown in FIGS. 6 and 9, the material feeding device 1 of the present embodiment includes a first cam 12 and a first gripper device 4 as a means (a first gripper sliding device) for operatively connecting the first cam 12 and the first gripper device 4. A swing arm 17 that swings with the rotation of the cam 12, and the swing arm 17 is operatively connected to the slide block 11 to swing the swing arm 17 along the material transfer path of the slide block 11. It has a connecting means (a slide piece 21, an adjustment piece 25, etc. to be described later) for converting into a linear motion.
The swing arm 17 is mounted on a turret 20 rotatably mounted on the housing 16 via a flange 18 and a bearing member 19 shown in FIG. The turret 20 has a cam follower 20 a that engages with the cam surface of the first cam 12. These cam followers 20a roll on the cam surface of the first cam 12 in accordance with the rotation of the first cam 12, rotate the turret 20 as shown in FIGS. 6A and 6B, and are fixed thereto. The swing arm 17 is swung.
[0020]
The swing arm 17 includes an arm main body 24 having a support plate 24a at an outer end. A groove 24a extending in the longitudinal direction and opening upward is formed in the arm body 24, and an adjustment piece 25 is slidably fitted in the groove 24a. The slide piece 21 is rotatably mounted on the adjustment piece 25 via a pin 26. On the bottom surface of the sliding block 11, a groove 11a extending in a direction perpendicular to the plate material transfer direction and opening downward is formed, and a slide piece 21 is slidably fitted in the groove 11a.
The slide piece 21 can be slid integrally with the adjustment piece 25 in the length direction of the swing arm 17 so that the distance from the rotation center 17a of the swing arm 17 can be changed. is there. By changing the position of the slide piece 21 in this manner, the moving amount of the sliding block 11 with respect to the swing angle of the swing arm 17 can be changed, and the feed amount of the material 8 can be adjusted.
[0021]
The sliding mechanism of the slide piece 21 is configured by screwing a male screw member 23 having a feed amount adjustment knob 22 at the outer end with an adjustment piece 25. The adjustment knob 22 is exposed to the outside of the housing 11 so as to enable a rotation operation from outside. When the adjustment knob 22 is turned, the adjustment piece 25 moves in the length direction of the swing arm 17, and the slide piece 21 can be shifted integrally therewith.
[0022]
For example, if the slide piece 21 is shifted in the direction of the tip of the swing arm 17 and is separated from the rotation center 17a of the swing arm 17, the moving distance of the slide block 11 can be increased to increase the feed amount of the material 8. I can do it. Conversely, if the slide piece 21 is moved closer to the rotation center 17a of the swing arm 17, the moving distance of the sliding block 11 can be reduced, and the feed amount of the material 8 can be reduced. In FIG. 9, reference numeral 16a denotes a slide member provided on the housing 16 and slidably in contact with the slide block 11.
[0023]
As shown in FIGS. 3, 4 and 7, the means for operatively connecting the second cam 13 and the first movable gripper 3 (the first gripper operating device) is provided with the support shaft 38 as the second cam 13 rotates. A first lift arm 31 that swings around and moves the operating body 27 up and down is provided. As shown in FIG. 8, the support shaft 38 is fixed to the housing 16, and the first lift arm 31 is mounted on the support shaft 38 via bearings 40a and 40b. Cam followers 32 and 33 are provided at the lower end of the operating body 27 and the tip (the right end in FIG. 4) of the first lift arm 31, respectively. The elastic member 34 urges the first lift arm 31 so that the upper surface of the first lift arm 31 and the cam follower 33 are brought into contact with the cam follower 32 and the second cam 13, respectively.
[0024]
The operating body 27 is held by a fixed block 35 fitted to the shafts 28 and 29 at a position downstream of the sliding block 11 in the material transfer direction. The shaft 29 has an operating piece 29a protruding radially outward, and the operating body 27 is engaged with the operating piece 29a via the half moon pieces 36a and 36b. The half moon pieces 36a and 36b are incorporated between the operating piece 29a and the operating body 27 so as to slidably contact the operating piece 29a and the operating body 27.
[0025]
As described above, the sliding block 11 is slidably fitted to the shafts 28 and 29, and the sliding block 11 holds the first movable gripper 3. As shown in FIG. 7, the operating piece 29a extends over a predetermined length along the axis 29, and the first movable gripper 3 is connected to the half-moon frames 37a and 37b similar to the half-moon frames 36a and 36b. Is engaged with the operating piece 29a via
[0026]
The first gripper operating device has the above-described configuration. When the second cam 13 rotates integrally with the input shaft 30, the first lift arm 31 swings around the support shaft 38, and the operating body 27 Is displaced up and down. When the operating body 27 is displaced in this manner, the shaft 29 rotates with respect to the fixed block 35, and accordingly, the operating piece 29a moves up and down.
When the operating piece 29a moves up and down in this way, the first movable gripper 3 that engages with the operating piece 29a via the half-moon pieces 37a and 37b moves up and down. Therefore, the material clamp portion 3a of the first movable gripper 3 is displaced in a direction of coming and going with respect to the material clamp portion 2a of the first fixed gripper 2, and performs a material clamping and unclamping operation.
Since the shaft 29 rotates with respect to the fixed block 35 as described above, both ends of the shaft 29 are supported by the wall of the housing 16 via the bearing members 74a and 74b as shown in FIG. I have.
[0027]
The means for operatively connecting the third cam 14 and the second movable gripper 6 (second gripper operating device) is provided around the support shaft 38 with the rotation of the third cam 14, as shown in FIGS. A second lift arm 41 that swings and moves the second movable gripper 6 up and down is provided. Cam followers 42 and 43 are provided at the lower end of the second movable gripper 6 and the tip (right end in FIG. 5) of the second lift arm 41, respectively. The elastic member 44 urges the second lift arm 41 so that the upper surface of the second lift arm 41 and the cam follower 43 come into contact with the cam follower 42 and the third cam 14, respectively.
The second fixed gripper 5 has an adjustment block 45 that is fitted to the shafts 28 and 29 at a position downstream of the fixed block 35 in the material transfer direction, and the second movable gripper 6 slides up and down on the adjustment block 45. It is movably held.
[0028]
The second gripper operating device has the above-described configuration. When the third cam 14 rotates integrally with the input shaft 30, the second lift arm 41 swings around the support shaft 38, and the second movable arm 41 moves accordingly. The gripper 6 is displaced up and down. Therefore, the material clamping portion 6a of the second movable gripper 6 is displaced in a direction in which the material clamping portion 5a of the second fixed gripper 5 is separated from and brought into contact with the material clamping portion 5a, and performs a material clamping and unclamping operation.
[0029]
As described above, the first gripper device 4 is movable along the material transfer path by the operation of the first gripper sliding device. Further, the first and second gripper devices 4 and 7 perform a material clamping and unclamping operation by operating the first and second gripper operating devices, respectively. The operation timings of the first gripper sliding device and the first and second gripper operating devices are appropriately determined by appropriately determining the shapes of the cam surfaces of the first, second, and third cams 12, 13, and 14. Can be set.
In the illustrated embodiment, the second gripper device 7 that does not move along the material transfer path is arranged at a position downstream of the first gripper device 4 in the material transfer direction. Of course, it is also possible to arrange the 7 upstream of the first gripper device 4.
[0030]
Next, a configuration for adjusting the distance between the first fixed gripper 2 and the first movable gripper 3 and the distance between the second fixed gripper 5 and the second movable gripper 6 according to the thickness of the material will be described.
In particular, as clearly shown in FIGS. 1, 2, 11 and 12, eccentric flanges 50, 51, 52 and 53 are provided near both ends of the pair of shafts 28 and 29. Each of the eccentric flanges 50, 51, 52 and 53 has an inner peripheral surface rotatably fitted to each shaft 28, 29 and an outer peripheral surface rotatably fitted to the wall of the housing 16. 28 and 29 are supported. Each of the eccentric flanges 50, 51, 52 and 53 has the same inner diameter and the same outer diameter. The eccentric amounts of the eccentric flanges 50, 51, 52 and 53, that is, the distance X between the center O of the circumference of the outer peripheral surface and the center O 'of the circumference of the inner peripheral surface are the same, The eccentric flanges 50, 51, 52 and 53 are mounted eccentrically in the same direction with respect to the shafts 28 and 29. That is, in FIG. 11, the eccentric flange 50 is eccentric to the left from the center O ′ to the center O by the distance X, but the eccentric flange 51 is also eccentric to the left from the center O ′ to the center O by the distance X. . The eccentric directions of the eccentric flanges 52 and 53 are the same as those of the eccentric flanges 50 and 51.
In the present embodiment, the inner and outer diameters of the four eccentric flanges are the same, but the eccentric flanges 50, 51, 52, and 53 have the same amount of eccentricity, and the respective shafts 28, 29. Are required to be mounted eccentrically in the same direction, but their inner and outer diameters do not necessarily have to be the same.
[0031]
The material feeder is provided with a synchronous rotating device for rotating the eccentric flanges 50, 51, 52 and 53 in synchronization with the housing 16 and the shafts 28 and 29.
That is, gears 54, 55, 56, 57 are formed on the outer periphery of each eccentric flange 50, 51, 52, 53. The gears 54 and 55 located near one end (the right end in FIG. 2) of the shaft 28 and the shaft 29 are engaged with an intermediate gear 58 for interlocking these gears. An intermediate gear 59 for interlocking these gears is engaged with the gears 56 and 57 located near (the left end in FIG. 2). The intermediate gears 58 and 59 are rotatably mounted on the wall of the housing 16.
[0032]
The adjustment shaft 60 extends through the fixed block 35 in parallel with the shafts 28 and 29, and the both ends are rotatably supported on the wall of the housing 16 via bearing members 61 and 62, respectively. Gears 63 and 64 are fitted near both ends of the adjustment shaft 60 adjacent to the bearing members 61 and 62, and the gears 63 and 64 are engaged with the gears 54 and 56, respectively. One end (right end in FIG. 2) of the adjustment shaft 60 is a rotation operation part 61 a protruding outside the housing 16.
[0033]
The material feeder of the illustrated embodiment has the above-described configuration. If the adjustment shaft 60, which is a component of the synchronous rotation device, is rotated clockwise by a predetermined angle from the state shown in FIG. 63, 64 and the gears 54, 56 engaged therewith rotate counterclockwise, and the eccentric flanges 50 and 52 rotate counterclockwise with respect to the housing 16 and shaft 28. Also, the eccentric flanges 51, 53 are connected to the intermediate gears 58, 59 which engage with the gears 54, 56, and the intermediate gears 58, 59 which engage with the intermediate gears 58, 59 and the gears 55, 57 which engage therewith. It rotates counterclockwise with respect to the shaft 16 and the shaft 29.
When the eccentric flanges 50 to 53 rotate in this manner, the shafts 28 and 29 are displaced upward, and the material clamping portions of the first fixed gripper 2 and the second fixed gripper 5 via the sliding block 11 and the adjusting block 45. Is displaced away from the material clamp portions of the first movable gripper 3 and the second movable gripper 6. Therefore, the gap S between the material clamps of the first fixed gripper 2 and the second fixed gripper 5 and the material clamps of the first movable gripper 3 and the second movable gripper 6 is shown in FIG. It becomes wider than it is.
[0034]
When the adjusting shaft 60 is rotated by a predetermined angle in the opposite direction to the above-mentioned direction, that is, counterclockwise from the state of FIG. 11A, the eccentric flanges 50 to 53 rotate clockwise with respect to the housing 16 and the shaft 28, The shafts 28, 29 are accordingly displaced downward. Therefore, the material clamp portions of the first fixed gripper 2 and the second fixed gripper 5 are displaced in a direction approaching the material clamp portions of the first movable gripper 3 and the second movable gripper 6, and the first fixed gripper 2 and the second fixed gripper 2 are displaced. The gap between the material clamp portion of the fixed gripper 5 and the material clamp portions of the first movable gripper 3 and the second movable gripper 6 becomes narrow as shown by S ′ in FIG. 11B. .
[0035]
As is clear from the above description, in the illustrated embodiment, the material clamping portions of the first fixed gripper 2 and the second fixed gripper 5 are changed to the first movable gripper 3 and the second movable gripper 5 in accordance with the rotation direction and the rotation amount of the adjustment shaft 60. The gripper 6 can be displaced by a predetermined distance in a direction in which the gripper 6 is separated from and brought into contact with the material clamp portion. Therefore, the clamping force when clamping the material by the first gripper device 4 and the second gripper device 7 can be adjusted to an appropriate value according to the thickness of the material by an extremely simple operation of rotating the adjustment shaft 60. Can be.
[0036]
Although the synchronous rotation device of the above-described embodiment uses various gears, a configuration using an adjustment shaft 60A and swinging adjustment arms 70 and 71 as shown in FIG. 12 is also possible. It is. That is, in the synchronous rotation device shown in FIG. 12, the adjustment shaft 60A is movable in the longitudinal direction, and one ends of the adjustment arms 70 and 71 are fitted to the outer peripheral surfaces of the eccentric flanges 50 and 51, respectively. The other ends of the adjusting arms 70 and 71 are connected to the adjusting shaft 60A via link connecting parts 72 and 73, respectively.
[0037]
In this configuration, when the adjustment shaft 60A is moved in the longitudinal direction as indicated by A and B in FIG. 12, the adjustment arms 70 and 71 swing as indicated by A and B, and the eccentric flanges 50 and 51 can be rotated as indicated by A and B.
Although FIG. 12 shows only the configuration for rotating the two eccentric flanges 50 and 51, the eccentric flanges 52 and 53 are provided with the same adjustment shaft and adjustment arm as the adjustment shaft 60A and the adjustment arms 70 and 71. By simultaneously moving the two adjusting shafts in the longitudinal direction by employing an appropriate mechanism, the four eccentric flanges 50 to 53 are synchronously rotated to displace the shafts 28 and 29 up and down. Can be done.
In the present specification, the “thickness” of the material means “plate thickness” when the material is a plate, for example, and “wire diameter” when the material is a wire having a circular cross section. Meaning.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view illustrating an overall configuration of a material feeding device according to an embodiment of the present invention.
FIG. 2 is a partial cross-sectional top view of the material feeding device.
FIG. 3 is an explanatory sectional view of FIG. 2 as viewed in the direction of arrows III-III.
FIG. 4 is an explanatory cross-sectional view of FIG. 2 as viewed in the direction of arrows IV-IV.
FIG. 5 is an explanatory cross-sectional view of FIG. 2 as viewed in the direction of arrows VV.
FIG. 6 is a view showing a first gripper sliding device of the material feeding device, wherein (A) shows a state before feeding and (B) shows a state after feeding.
FIG. 7 is a perspective view showing an assembled state of a first gripper device and a second gripper device of the material feeding device and a device for operating them.
FIG. 8 is a partially sectional explanatory view showing a cam device for driving the material feeding device.
FIG. 9 is an explanatory partial cross-sectional view showing a related structure between a first cam and a first gripper device of the cam device.
FIGS. 10A, 10B, 10C, and 10D are schematic diagrams showing a feeding operation of the feeding device.
FIG. 11 is an explanatory cross-sectional view showing an operative relationship between an eccentric flange provided in the feeder and a synchronous rotating device for synchronously rotating the eccentric flange, and first and second gripper devices, wherein (A) is an eccentric flange; And (B) shows a state in which the fixed gripper is lowered by a predetermined amount according to the rotation of the eccentric flange.
FIG. 12 is an explanatory diagram showing a modification of the synchronous rotation device.
[Explanation of symbols]
1 Material feeder
2 First fixed gripper
3 First movable gripper
4 First gripper device
5 Second fixed gripper
6 Second movable gripper
7 Second gripper device
12 First cam
13 Second cam
14 Third cam
17 Swing arm
28, 29 axes
30 input shaft
31 1st lift arm
41 2nd lift arm
45 Adjustment block
50-53 Eccentric flange
54-57 gear
60 Adjustment axis
63, 64 gears

Claims (4)

The first fixed gripper and the first movable gripper are configured to clamp and unclamp the material, and the first fixed gripper is supported slidably on a pair of shafts arranged along the material transfer path. And a first fixed gripper and a second movable gripper arranged at a position downstream or upstream in the material transfer direction with respect to the first gripper device, and clamping and unclamping of the material by the second fixed gripper and the second movable gripper. And a second gripper device in which a second fixed gripper is supported by the pair of shafts, wherein movement of the first movable gripper and the second movable gripper and reciprocal sliding of the first gripper device are performed. In a material feeding device that is generated at a predetermined timing and causes intermittent feeding of the material,
Equipped with eccentric flanges located near both ends of each shaft and supporting each shaft, each eccentric flange is rotatable on the inner peripheral surface rotatably fitted to each shaft and the wall of the housing of the material feeder. The eccentric flange has the same amount of eccentricity, is mounted eccentrically in the same direction with respect to each axis, and further, each eccentric flange is The material clamps of the first fixed gripper and the second fixed gripper are displaced in a direction in which the material clamps of the first movable gripper and the second movable gripper are separated from each other by rotating in synchronization with the housing and each axis. Feeder, characterized in that a synchronous rotating device for the same is provided. The first fixed gripper has a sliding block, the sliding block is slidably fitted to the pair of shafts, and the second fixed gripper has an adjusting block, and the adjusting block is The material feeding device according to claim 1, wherein the material feeding device is fitted on the pair of shafts. The first movable gripper is slidably held by the sliding block so that the material clamp portion can be displaced in a direction of moving away from and closer to the material clamp portion of the first fixed gripper, and the second movable gripper is slidable. 3. The material feeding device according to claim 2, wherein the material clamping unit is held by the adjustment block so that the material clamping unit can be displaced in a direction of moving toward and away from the material clamping unit of the second fixed gripper. A cam device having first, second, and third cams fixed to an input shaft that is continuously driven to rotate in one direction;
A swing arm that swings in accordance with the rotation of the first cam, and the swing arm and the slide block are operatively connected to each other so that the swing of the swing arm can be changed to a linear motion along the material transfer path of the slide block. A first gripper sliding device having a coupling means for converting;
The second cam and the first movable gripper are operatively connected to each other, and the material clamp portion of the first movable gripper is displaced in a direction in which the material clamp portion of the first movable gripper is separated from and contacted by the rotation of the second cam. A first gripper actuator;
The third cam and the second movable gripper are operatively connected, and the material clamp portion of the second movable gripper is displaced in a direction in which the material clamp portion of the second movable gripper is separated from and brought into contact with the material clamp portion of the second fixed gripper according to the rotation of the third cam. The material feeder according to claim 2 or 3, further comprising a second gripper operating device.

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