JPH0332409B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Object of the Invention (1) Industrial Field of Application The present invention relates to a plastic processing machine, in particular, a plastic processing machine in which a plurality of processing stations are set at intervals along the conveyance direction of a workpiece. In a plastic processing machine in which each processing station is equipped with a lower die and an upper die for plastic working the workpiece in cooperation with each other, the workpiece is sequentially conveyed between the plurality of processing stations. The present invention relates to a conveying device.

(2) Prior Art Conventionally, in such a transfer device, a transfer bar is arranged on one side of each processing station, and the handling arm is supported in a cantilever manner by the transfer bar.

(3) Problems to be solved by the invention However, when the workpiece is relatively large and thin,
For example, in the case of a car hood or door outer, if the handling arm has few holding parts (such as suction cups) for the workpiece, the support for the workpiece becomes unstable, so the handling arm itself is formed relatively long and has multiple suction cups attached to it. However, in that case, there is a problem that the longer the cantilevered handling arm is, the more unstable it becomes. In addition, in order to stabilize the support for the workpiece, for example, multiple handling arms are arranged in parallel at intervals in the workpiece transport direction corresponding to one processing station, and these arms are swung to a standby position on the side of the processing station. It is conceivable to move the handling arms together with the transfer bar to a standby position between adjacent processing stations, but especially when swinging these handling arms to a standby position on the side of the processing station, the arms and the Since the motion form is completely different from that of the supporting transfer bar,
There are problems such as the structure of these control mechanisms being relatively complex, and when moving multiple handling arms to standby positions between adjacent processing stations, it is necessary to ensure a wide gap between the processing stations. There is a problem that the entire apparatus becomes elongated in the direction of conveying the workpiece.

The present invention has been proposed in view of the above, and it simplifies the structure and allows a series of plastic working to be carried out by making the handling arm movable along the transfer bar and allowing it to stand by between processing stations during press working. The main object of the present invention is to provide a conveying device for a plastic working machine that allows smooth processing and eliminates the need to set the intervals between processing stations so widely.

B. Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a method in which a plurality of machining stations are set at intervals along the conveyance direction of the workpiece, and each of the machining stations In a plastic processing machine that is provided with a lower die and an upper die for plastic working a workpiece in cooperation with each other, a pair of transfer bars are arranged on both sides of each processing station along the conveyance direction. and disposed corresponding to each processing station, and horizontally supported between both transfer bars so as to be relatively movable in the longitudinal direction of the transfer bar.
a plurality of handling arms capable of holding a workpiece; an arm drive means for driving each of the handling arms relative to the transfer bar in the longitudinal direction; The first feature is that the first feature includes a drive means for moving the transfer bars vertically and horizontally so that the transfer bars can be sequentially conveyed; are integrally connected via a stay provided at a position corresponding to the center between adjacent processing stations, and each handling arm is moved from a standby position close to the stay to a standby position close to the stay by the arm driving means. The second feature is that the device is moved back and forth between extended positions that are separated from each other.

(2) Effect Since each handling arm is supported on both sides by a pair of transfer bars, even if the arm itself is made relatively long to add a workpiece holding part, the support by the transfer bars is stable, which makes it suitable for automobiles. Even relatively large and thin workpieces, such as the bonnet of a car, can be held extremely stably and accurately by the handling arm.

Furthermore, by moving each handling arm relative to the transfer bar in its longitudinal direction, the handling arms that are to be kept on standby can be brought close to each other in the space between adjacent processing stations during plastic processing.
The distance between processing stations can be reduced as much as possible.

In particular, according to the configuration of the second invention, the two transfer bars are connected by the stay between the processing stations, and the intermediate portions of the two transfer bars are mutually reinforced, so even if the bar is relatively long, the Vibration is effectively suppressed.

(3) Embodiments Below, embodiments of the present invention will be explained with reference to the drawings. First, the first embodiment will outline one embodiment of the present invention.
In the figure, a plastic processing machine such as a press machine 1 has a plurality of processing stations S1 to _S1 in this embodiment, along the conveyance direction 2 of a workpiece W.
S ₅ are set at equal intervals, and each processing station S ₁ to S ₅ has lower dies 3 ₁ to 3 ₅ and upper dies 4 ₁ to 4 ₅ for working together to press the workpiece W, respectively. will be placed. That is, the lower molds 3 ₁ to 3 ₅ are fixed to the bolsters 6 on the base 5 at equal intervals along the conveying direction 2, and the lower molds 3 ₁ to 3 are fixed to the holder 8 fixed to the lifting table 7. Upper dies 4 ₁ to 4 ₅ are supported corresponding to ₅ , respectively. This press machine 1 has a conveying device 9
is attached, and the lower mold 3 is lowered by lowering the lifting platform 7.
After press working of _{dies 1} to 3 ₅ and upper dies 4 ₁ to 4 ₅ , the conveyance device 9 is activated and the work W is sequentially conveyed to the next processing station along the conveyance direction 2 .

The conveyance device 9 is horizontally supported and conveyed between a pair of transfer bars 10 and 11 arranged parallel to the conveyance direction 2 on both sides of each processing station _S1 to _S5 , and between the transfer bars 10 and 11. It has a plurality of handling arms A1a, A1b...A5a, A5b that are movable back and forth along direction 2. These handling arms A1a, A1b
...A5a, A5b and transfer bar 1
The workpiece W is transported by the movement of the first processing station S ₁ to S 5 , and the configuration is the same for each processing station S 1 to S ₅ .
This will be explained based on the drawing near _S1 .

Referring also to FIG. 2, both transfer bars 10 and 11 extend between the first processing station S1 _and the fifth processing station _S5 , and the transfer bars _{10 and} 11 extend from the first processing station S1 to the fifth processing _{station S5} . Both transfer bars 10 and 11 are connected by stays 12 between them. Moreover, each stay 12 is connected to each processing station S ₁ to _{S 5} when both transfer bars 10 and 11 are in a stationary state during press processing.
They are arranged so as to be located in the center between them.

Further, with reference to FIGS. 3 and 4,
Guide rails 13 extending horizontally along the conveyance direction 2 are disposed on both outer sides of both transfer bars 10 and 11, and each guide rail 13
is supported by pillars 14 erected on the floor. A pair of wheels 15 are mounted on both guide rails 13.
The running plates 16 are respectively placed through the
Both running plates 16 are connected by a connecting rod 17 to form a running vehicle 18.
is configured. This traveling vehicle 18 can run forward and backward along the conveying direction 2 on both guide rails 13, and is arranged on the guide rail 13 corresponding to at least both ends of the transfer bars 10 and 11. In addition, guide rods 19 are located near both ends of the connecting rod 17.
are respectively erected, and a cylindrical connecting member 20 is fitted into each guide rod 19 so as to be vertically movable.
Connected to the ends of 0 and 11. Therefore, by driving the traveling vehicle 18 back and forth along the transport direction 2 on the guide rail 13, both transfer bars 10 and 11 are horizontally moved back and forth along the transport direction 2. At the same time, both transfer bars 1
0 and 11 are movable up and down along the guide rod 19.

Next, the structure of the driving means for driving the transfer bars 10, 11 will be explained with reference to FIGS. 5 and 6. The driving means 21 of the transfer bars 10, 11 horizontally A mechanism for moving both transfer bars 10 and 11 in the vertical direction is provided. First, in order to move the transfer bars 10, 11 in the horizontal direction, the drive means 21 has a Geneva arm 22 and a groove 23 into which the Geneva arm 22 can fit.
and a transmission mechanism 25 for converting the rotational motion of the Geneva plate 24 into horizontal reciprocating motion and transmitting it to the transfer bars 10 and 11.

Both transfer bars 1 along the conveying direction 2
A support stand 29 consisting of a pair of side plates 27 and 28 erected at a distance from a base plate 26 is fixed to the floor surface above 0 and 11, and one side plate 27
The side plate 2 of the first rotating shaft 30 is rotatably supported on the
A bevel gear 31 is fixed to the end projecting outward from 7. On the other hand, a bevel gear 33 is fixed to a transmission shaft 32 extending from a drive source (not shown) for driving the elevator platform 7 up and down, and this bevel gear 33 meshes with the bevel gear 31.

Between the side plates 27 and 28 of the support base 29, there are second and third plates parallel to the first rotation axis 30.
Rotating shafts 34 and 35 are each rotatably supported. A first gear 36 is fixed to the end of the first rotating shaft 30 that protrudes inward from one side plate 27, and this first gear 36 is connected to a second gear 37 fixed to the second rotating shaft 34. is engaged with. Therefore, the first
The rotational driving force transmitted to the rotating shaft 30 is further
The signal is transmitted to the rotating shaft 34.

In the middle of the second rotating shaft 34, there is a pair of disc-shaped rotating plates 38, 3 facing each other with an interval in the axial direction.
9 is fixed. Further, on the outside of both rotary plates 38 and 39, the second rotary shaft 34 has a disc-shaped adjusting plate 4.
0 and 41 are rotatably supported, respectively. Therefore, both adjusting plates 40, 41 are rotating plates 38, 39.
and is rotatable relative to the second rotating shaft 34. A cylindrical regulating member 42 is interposed between the second gear 37 and one adjusting plate 40, and the other adjusting plate 40 is interposed between the second gear 37 and one adjusting plate 40.
A support plate 4 fixed to the second rotating shaft 34 facing the support plate 1
A cylindrical regulating member 44 is interposed between the adjusting plate 3 and the other adjustment plate 41. Therefore, both adjusting plates 4
0 and 41 are prevented from moving along the axial direction of the second rotating shaft 34, and the rotating plates 38 and 39
sliding into contact with.

The Geneva arms 22 are arranged at a plurality of locations, for example, three locations, which are equally spaced in the circumferential direction of both the rotating plates 38, 39 and both the adjusting plates 40, 41. A roller 45 is supported at the free end of each Geneva arm 22 with a rotation axis parallel to the axis of the second rotation shaft 34 . Further, the base end of each Geneva arm 22 is movably engaged with both rotating plates 38 and 39 along the radial direction, and a protrusion 46 protruding from the base end is bored into both adjustment plates 40 and 41. They are respectively engaged with arc-shaped elongated holes 47 that extend radially inward toward one side in the circumferential direction. Therefore, by angularly displacing the adjusting plates 40, 41 relative to the rotary plates 38, 39, each Geneva arm 22 can be moved around the second rotation axis 34 of the roller 45 at its free end.
The rotary plates 38, 3 are rotated so that the amount of protrusion from the
9 and adjustment plates 40 and 41 in the radial direction.

In order to drive the adjustment plates 40 and 41 by relative angular displacement with respect to the rotary plates 38 and 39, a sector gear 48 is carved in a part of the outer periphery of the other adjustment plate 41, and a drive gear that meshes with this sector gear 48 is provided. gear 49
is a pulse motor fixedly supported on the support plate 43
It is fixed to the output shaft 50 of the PM. Therefore, by operating the pulse motor PM, the other adjustment plate 41 is angularly displaced relative to the rotary plates 38 and 39, each Geneva arm 22 is displaced toward or away from the second rotation shaft 34, and furthermore, one of the The adjusting plate 40 is angularly displaced relative to the rotary plates 38 and 39.

In the middle of the second rotating shaft 34, the rotating plate 38,
The Geneva plate 24 is fixed at a position corresponding to the gap 39. The Geneva plate 24 has a plurality of radially extending grooves 23, for example four, provided at equal intervals in the circumferential direction, and each Geneva arm 22 can be fitted into each groove 23. Each Geneva arm 22 and adjustment plate 4
0 and 41 also rotate, and the Geneva arm 22 fits into the groove 23, so that the Geneva plate 2
4 and the third rotating shaft 35 are rotated. Moreover, when the amount of protrusion of each Geneva arm 22 from the second rotating shaft 34 becomes large, the roller 45 at the free end of the Geneva arm 22 comes into contact with the side edge of the groove 23 on the upper side of the Geneva plate 24 along the operating rotation direction. , the Geneva plate 24 is rotated in a direction opposite to the operating rotation direction. Therefore, it is possible to delay the operating rotational movement of the third rotary shaft 35 by a time corresponding to the amount of protrusion of the Geneva plate 22 from the start of the operation of the drive source for the lifting table 7, that is, the start of the lifting and lowering operation of the lifting table 7. The delay time can also be adjusted by controlling the amount of relative angular displacement of the adjusting plates 40, 41 with respect to the rotary plates 38, 39.

The rotational movement of the Geneva plate 24, that is, the rotational movement of the third rotating shaft 35, is transmitted to both transfer bars 10, 11 via the transmission mechanism 25. This transmission mechanism 25 includes a third gear 51 fixed to a third rotating shaft 35, a camshaft 52 rotatably arranged around an axis parallel to the third rotating shaft 35, and a camshaft 52 fixed to the camshaft 52. and the fourth gear meshes with the third gear 51.
A gear 53, a pair of cams 54 fixed to both ends of the camshaft 52, a link shaft 55 rotatably arranged around an axis parallel to the cam 54, one end fixed to the link shaft 55 and the other end is a pair of swing arms 5 on which a cam roller 56 that is in sliding contact with a cam 54 is pivotally supported.
7, a pair of first links 58 having one end fixed to the link shaft 55, and a pin 59 parallel to the link shaft 55.
A pair of second links 60 are provided, one end of which is connected to the other end of the first link 58 and the other end of which is connected to the traveling vehicle 18. Cam shaft 52 and link shaft 55
are rotatably supported by support members 61 fixed to the floor.

In this transmission mechanism 25, the third rotating shaft 35 is rotationally driven from the Geneva arm 22 via the Geneva plate 24 in response to the lifting and lowering operations of the lifting table 7, that is, the upper molds 4 ₁ to 4 ₅ . The cam 54 is rotationally driven by the meshing of the four gears 53. Since the cam roller 56 is in sliding contact with the cam 54 that rotates together with the camshaft 52, the swing arm 57 swings and the link shaft 55 reciprocates, and in response, the first link shaft 5
8 swings. Therefore, the second link 60 reciprocates in its longitudinal direction, and both transfer bars 10 and 11 move toward the guide rail 13 via the traveling vehicle 18.
It reciprocates back and forth along the conveyance direction 2 at the top.

In order to move the transfer bars 10, 11 up and down, a hydraulic cylinder (not shown) is provided between the connecting rod 17 of the traveling vehicle 18 and the transfer bars 10, 11, and the operation of the hydraulic cylinder moves the transfer bars 10, 11. moves up and down.

In this way, both transfer bars 10,1
1 is moved horizontally and vertically along the conveying direction 2 by the driving means 21, and is moved as a whole to draw a rectangular locus in a vertical plane.

Referring again to FIG. 2, handling arm A
1a and A1b are installed between both transfer bars 10 and 11 at the front and back along the conveyance direction 2 in correspondence with the first processing station _S1 , and the remaining handling arms A2a, A2b...A5a, A5b also correspond to the processing station _S2. ~ _S5 is installed between both transfer bars 10 and 11 at the front and rear along the conveyance direction 2. Therefore, in each adjacent processing station, a handling arm on the front side along the transport direction 2 and a handling arm on the rear side along the transport direction 2 are arranged on both sides of each stay 12. That is, for example, the front handling arm A1a along the transport direction 2 at the first processing station _S1 and the rear handling arm A2b along the transport direction ₂ at the second processing station S2 are arranged on both sides of the stay 12. will be done.

Referring also to FIG. 7, both transfer bars 10 and 11 have guide holes 62 extending along the conveying direction 2 corresponding to each processing station _S1 to _S5 .
is drilled. In addition, each handling arm A1
a, A1b...A5a, A5b are provided with protrusions 64 that protrude downward and have a locking part 63 at the tip, and each protrusion 64 connects the locking part 63 to the transfer bar 10, 11. The guide hole 62 is inserted into the guide hole 62 so as to be locked therein. Therefore, each handling arm A1a, A1b...A5a, A5b
is movable on the transfer bars 10 and 11 along the guide hole 62, that is, along the conveying direction 2.

Such handling arms A1a, A1b
...The arm drive means 65 for driving A5a and A5b includes a pair of drive racks 66 disposed on the sides of both transfer bars 10 and 11 so as to be movable along the conveying direction 2, and each processing station _S1 . ~
Rack 67 is carved on each of the front side handling arms A1a to A5a along the conveyance direction 2 at S5 and faces the drive rack 66, and the rear side handling arm along the conveyance direction ₂ at each processing station _S1 to _S5 . Rack 68 is engraved on each of A1b to A5b and faces the drive rack 66.
, a single pinion 69 interposed between the rack 67 and the drive rack 68 on one side and pivotally supported by the transfer bars 10 and 11; A pair of pinions 7 supported by
0, 71, a drive pinion 72 that is pivotally supported at the ends of both transfer bars 10, 11 and meshes with the drive rack 66, an arm drive source 73 fixedly arranged on the floor, and a rotation shaft 74 of the drive pinion 72. and a power transmission mechanism 7 that connects the arm drive source 73.
It consists of 5.

The drive rack 66 extends long along the conveyance direction 2, and is placed on a guide shelf 76 projecting from the sides of the transfer bars 10, 11. Further, a guide hole 77 extending along the conveyance direction 2 is bored in the side of the drive rack 66, and a locking pin 78 implanted in the transfer fibers 10, 11 is inserted into the guide hole 77. , the locking pin 7
A locking portion 79 provided at the tip of the drive rack 6
It is locked at 6. Therefore, both drive racks 66 are movable back and forth along the conveying direction 2 while slidingly contacting the sides of both transfer bars 10, 11.

The arm drive source 73 is, for example, a pulse motor, and the power transmission mechanism 75 that connects its output shaft 80 and the rotating shaft 74 of the drive pinion 72 is connected to the output shaft 8.
Transmission cylinder 82 connected to 0 via universal joint 81
and a transmission shaft 84 that fits into the transmission cylinder 82 and is spline-coupled, and is connected to the rotating shaft 74 via a universal joint 83. Therefore, the power transmission mechanism 75 includes both transfer bars 10 and 1.
Regardless of the horizontal movement and vertical movement of the arm drive source 73 , the rotational drive force from the arm drive source 73 can be transmitted to the drive pinion 72 via the rotation shaft 74 .

In this arm drive means 65, the drive rack 66 moves forward or backward along the conveyance direction 2 in response to the rotation of the drive pinion 72. The movement of this drive rack 66 is carried out via a pinion 69 and a rack 67 to one of the handling arms A1a to
A5a and their handling arms A1a-A5a move in the opposite direction to the drive rack 66. Further, the operation of the drive rack 66 is transmitted to the other handling arms A1b to A5b via the pair of pinions 70, 71 and the rack 68.
The handling arms A1b-A5b move in the same direction as the drive rack 66. Therefore, the handling arms A1a, A2b on both sides of the stay 12 are moved by the arm driving means 65 in opposite directions, that is, in directions toward each other or in directions away from each other.

A control means 85 is connected to the arm drive source 73, and this control means 85 controls each handling arm A1a, A1b...A5a, _A5b during press working by the lower dies ₃₁ to ₃₅ and the upper dies ₄₁ to 45. waits at the standby position between each processing station S ₁ to S ₅ ,
At the start of transportation, each handling arm A1a, A
1b...The rotational direction of the arm drive source 73 can be controlled so that A5a, A5b moves to the operating position on the corresponding processing station _S1 to _S5 .

In addition, each handling arm A1a, A1b...A
Suction cups (not shown) are provided at the lower portions of 5a and A5b, and the workpiece W is held by these suction cups.

Next, to explain the operation of this embodiment, after the press working by the lower molds 3 ₁ to 3 ₅ and the upper molds 4 ₁ to 4 ₅ at each processing station S ₁ to _{S 5} , the conveying device 9 operates as follows. and each processing station.
The work W on S ₁ ~ _{S 5} is transferred to the next processing station S ₂ ~
S ₅ and transported to the discharge position. That is, the lifting platform 7
When the upper molds 4 ₁ to 4 ₅ integrated therewith start to ascend, the arm drive means 65 is activated to move the corresponding handling arms A1a, A1b...A5a onto each of the processing stations _S1 to _S5 . ,A5b
moves from the standby position to the operating position. Then,
Each handling arm A1a, A1b...A5a,
When the corresponding workpiece is held by A5b,
Both transfer bars 10,
11 moves upward, moves horizontally forward in the transport direction 2, transports each workpiece W onto the next processing station, and further descends. Therefore, each handling arm A1a, A1b...A5
By releasing the holding state of each workpiece W by a and A5b, those workpieces W are placed on the corresponding processing station.

Then, both transfer bars 10, 11 move rearward along the conveyance direction 2, and each handling arm A1a, A1b...A5a, A5b returns to the original processing station _S1 to _S5 . Thereafter, by the action of the arm driving means 65, each handling arm A1a, A1b...A5a, A5b moves from the operating position to the standby position of the transfer bar 10,1.
Each processing station moves along the longitudinal direction of 1.
Return between S ₁ and _{S 5} . Therefore, there are no objects in the processing stations S ₁ to _{S 5} that would interfere with the press working, and the workpiece W is pressed by the lowering movement of the lifting table 7 and the upper dies 4 ₁ to 4 ₅ .

In this way, the workpiece W is sequentially transferred from the first processing station _S1 to the fifth processing station _S5 while repeatedly pressing and transporting the work W, thereby completing a series of pressing operations. In addition, after pressing, when the upper molds 4 ₁ to 4 ₅ etc. start to move upward, each handling arm A1a, A1b...A5
a, movement of A5b and both transfer bars 10,
The transfer device 9 may be controlled so that the movement of the handling arms 11 and 11 are performed in parallel.
and A3b, A3a and A4b, A4a and A5
b) Each stay 12 is connected to an adjacent processing station S ₁ so that each stay can hold one workpiece.
~The movement of both transfer bars 10, 11 is stopped at a position facing above the center of _S4 , and the relative movement of each handling arm with respect to the bars 10, 11 is also stopped early, and then each handling arm is moved to the transfer bar 10, 11. After transporting the workpiece to the next processing station S ₂ to S ₅ and the discharge position and releasing the workpiece there, both transfer bars 10 and 11 are returned to their initial positions and each handling The return movement of the arm to the standby position is performed in parallel.

In the conveyance device 9 as in the above embodiment,
Since the workpiece W is held by the pair of handling arms, the workpiece W can be held stably. Further, the distance between the pair of handling arms and the distance between the handling arms on both sides of the stay 12 can be adjusted by controlling the arm driving means 65, so that the workpiece W
It is possible to reliably hold the workpiece W by adjusting the holding position according to the shape of the workpiece W, and the intervals between the processing stations S ₁ to S ₅ can be set relatively small.

Further, the operation start point of the transfer device 9 can be adjusted by adjusting the amount of protrusion of the Geneva arm 22 from the second rotating shaft 34. Therefore, the transfer start point can be adjusted according to changes in the shape of the work W. can be easily adjusted, and the operating rate of the press 1 can be increased.

Furthermore, since both transfer bars 10 and 11 are connected by stays 12 between each processing station _S1 to _S5 , both transfer bars 10 and 11 move synchronously and vibration is prevented. Ru.

In the above embodiment, in order to simplify the explanation, the configuration of the part that supplies the workpiece W to the first processing station _S1 has been omitted, but this part also corresponds to each of the processing stations _S1 to _S5 . It is sufficient to provide a hand rim arm having the same configuration as the part.

Furthermore, in the above embodiment, the case where the workpiece W is held by two handling arms has been explained, but when the workpiece W can be held by one handling arm, the handling arm A1 as shown in FIG. ~A5 may be placed. In this case, the intervals between each of the processing stations S ₁ to _{S 5} may not be equal, for example between the first and second processing stations S ₁ , S ₂ and between the third and fourth processing stations S ₃ , S Handling arm A between ₄
1, A2 and A3, A4 are placed on standby, the second and third processing stations
The spacing between S ₂ and S ₃ and between the fourth and fifth processing stations S ₄ and S ₅ can be reduced.

Therefore, in this example, after pressing,
When the lifting operation of the upper molds ₄₁ to ₄₅ , etc. is started, each of the handling arms A1 to A5 moves from the standby position shown in FIG. 8 to above the center of the adjacent processing stations _S1 to _S5 , Thereafter, the transfer bars 10, 11 descend to hold the workpiece, and then the transfer bars 10, 11 rise and move horizontally to the processing stations _S2 to _S5 and the discharge position, where they are lowered. When the workpiece is released, the transfer bars 10 and 11 are returned to their initial positions, and in parallel with or after the return movement, each of the handling arms A1 to A5 is returned to their standby positions, and then the workpiece is pressed. It will be done.

Furthermore, a plurality of handling arms may be arranged on one side of the stay 12.
It is also possible to provide a suction cup or the like to provide the same function as a handling arm.

C. Effects of the Invention As described above, according to the present invention, a pair of transfer bars are arranged on both sides of each processing station along the workpiece conveyance direction, and a pair of transfer bars are arranged corresponding to each processing station, and A plurality of handling arms capable of holding a workpiece are horizontally supported between transfer bars so as to be relatively movable in the longitudinal direction of the transfer bars, and an arm for driving each of the handling arms relative to the transfer bar in the longitudinal direction. and a drive means for moving the transfer bar vertically and horizontally so that the workpiece can be sequentially transported between a plurality of processing stations in cooperation with the handling arm. Each handling arm supported by the transfer bar on both sides is supported stably by the transfer bar even if the handle arm is made relatively long to add a workpiece holding section. Moreover, even thin workpieces can be held extremely stably and accurately by the handling arm. In addition, by appropriately moving each handling arm relative to the transfer bar in its longitudinal direction, the handling arms that should be waiting there during plastic processing can be brought close to each other in the space between adjacent processing stations. The space between the stations can be reduced as much as possible, and the space that inevitably exists between the processing stations can be used effectively as a standby space for the handling arm, which, together with the effect, greatly contributes to reducing the size of the device as a whole. be able to. Furthermore, since the direction of movement of the transfer bar can be matched with the direction of relative movement of the handling arm with respect to the transfer bar, the structure of the control mechanism for controlling the movement can be simplified as much as possible, leading to cost reduction. can contribute.

Furthermore, according to the second invention, both transfer bars are connected by a stay between the processing stations, and the intermediate portions of both transfer bars are mutually reinforced, so even if the transfer bar is relatively long, the vibration of the bar is reduced. The workpiece can therefore be held effectively by the handling arm supported on the bar.

[Brief explanation of the drawing]

1 to 7 show an embodiment of the present invention, in which FIG. 1 is a general schematic side view, FIG. 2 is an enlarged plan view of the main part of FIG. 1, and FIG. 3 is an enlarged plan view of FIG. - line arrow view, Figure 4 is an enlarged sectional view - line of Figure 2, Figure 5
The figure is a plan view showing the configuration of the driving means, and FIG.
FIG. 7 is an enlarged sectional view taken along the line - in FIG. 2, and FIG. 8 is a first embodiment of another embodiment of the present invention.
FIG. 3 is an overall schematic side view corresponding to the figure. _DESCRIPTION OF _SYMBOLS 1...Press machine as a plastic processing machine, 2...Conveyance direction, _31-35 ...Lower die, _41-45 ...Upper die,
9... Transfer device, 10, 11... Transfer bar, 12... Stay, 21... Drive means, 65
...Arm driving means, A1a, A1b...A5a,
A5b, A1~A5...Handling arm, S ₁
~S ₅ ...Processing station, W...Work.

Claims (1)

[Claims] 1. A plurality of processing stations are set at intervals along the conveyance direction of the workpiece, and each of the processing stations has a lower die and a mold for plastic working the workpiece in cooperation with each other. In a plastic processing machine in which an upper die is arranged, a pair of transfer bars are arranged on both sides of each processing station along the conveyance direction, and a pair of transfer bars are arranged corresponding to each of the processing stations, and A plurality of handling arms capable of holding a workpiece are horizontally supported between transfer bars so as to be relatively movable in the longitudinal direction of the transfer bars, and an arm for driving each of the handling arms relative to the transfer bar in the longitudinal direction. and a drive means for moving the transfer bar vertically and horizontally so that the workpiece can be sequentially transported between a plurality of processing stations in cooperation with the handling arm. A conveyor device in a plastic processing machine. 2. The conveyance device for a plastic processing machine according to claim 1, wherein one handling arm is provided corresponding to each processing station. 3. The plastic handling arm according to claim 1, wherein two handling arms are provided corresponding to each processing station, and the two handling arms are configured to move in opposite directions. Conveyance device in processing machine. 4 A plurality of processing stations are set at intervals along the conveyance direction of the workpiece, and each processing station is provided with a lower die and an upper die for plastic working the workpiece in cooperation with each other. In the plastic processing machine, the processing stations are arranged on both sides of each processing station along the conveyance direction, and are integrally connected to each other via a stay provided at a position corresponding to the center between adjacent processing stations. a pair of transfer bars, and a plurality of workpiece-holding units, which are disposed corresponding to each of the processing stations, and which are horizontally supported between the two transfer bars so as to be relatively movable in the longitudinal direction of the transfer bars. a handling arm; and arm driving means for driving each handling arm relative to the transfer bar in the longitudinal direction to reciprocate between a standby position close to the stay and an operating position spaced apart from the stay. , a drive means for moving the transfer bar vertically and horizontally so as to cooperate with the handling arm to sequentially transport the workpiece between a plurality of processing stations; Conveyance device in processing machine. 5. The stay is provided between adjacent processing stations, and the handling arm is
5. A conveyance device for a plastic processing machine according to claim 4, wherein two conveyance devices are provided corresponding to each processing station.