JPH021571B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (1) Industrial Field of Application The present invention provides a method in which a lower mold and an upper mold are respectively provided which can cooperate with each other to plastically process a workpiece, and
The present invention relates to a conveyance device in a plastic processing machine for sequentially conveying a workpiece between a plurality of processing stations set at intervals along the conveyance direction of the workpiece.

(2) Prior Art In particular, the transfer device in the plastic processing machine described above includes a pair of transfer bars that are arranged on both sides of each processing station, extend along the transfer direction, and are capable of reciprocating in the vertical and longitudinal directions. It is conventionally known to have a handling arm installed between both transfer bars corresponding to each processing station, and a workpiece holding means such as a suction cup provided on each handling arm.

(3) Problems to be Solved by the Invention In the conventional transfer device described above, the handling arm is generally fixed to the transfer bar, but depending on the shape of the workpiece, the relative position of the handling arm to the workpiece and the Therefore, it was necessary to change the position relative to the transfer bar, so in particular, a pair of handling arms was provided for each processing station, and workpieces such as thin plates were suctioned and held by workpiece holding means such as suction cups attached to each handling arm. In order to enhance the holding effect of a workpiece, depending on the shape of the workpiece, it may be necessary to change the suction position, that is, the mutual spacing between the pair of handling arms, as needed.

The present invention has been made in view of the above circumstances, and is a transport system in a plastic processing machine in which the distance between a pair of front and rear handling arms provided at each processing station can be arbitrarily adjusted in the workpiece transport direction. The purpose is to provide equipment.

B. Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention includes a lower die and an upper die that can cooperate with each other to plastically process a workpiece, and A conveyance device in a plastic processing machine for sequentially conveying a workpiece between a plurality of machining stations set at intervals along the conveyance direction of the plastic processing machine. A pair of transfer bars are disposed and extend along the conveyance direction and can reciprocate in the vertical and longitudinal directions, and a pair of transfer bars are arranged in parallel at the front and rear in the conveyance direction for each processing station, and each of both ends thereof is arranged in parallel. Handling arms supported by both transfer bars so as to be movable back and forth along the transport direction, workpiece holding means such as suction cups provided on each handling arm, and a pair of front and rear handling arms corresponding to each processing station. At least an arm driving means that can be driven toward and away from each other along the transport direction, and the arm driving means includes driven racks fixedly installed along the transport direction at both ends of each of the handling arms, and each of the driven racks. a drive rack that faces the driven rack and is slidably supported by each transfer bar and extends in the transfer direction; and one of a pair of front and rear handling arms corresponding to each processing station. A single first pinion is interposed between the driven rack and the driving rack and is pivotally supported by the transfer bar, and a single first pinion is interposed between the other driven rack and the driving rack and is each pivotally supported by the transfer bar. and a pair of second pinions which are engaged with each other, and a reciprocating drive mechanism for reciprocating the drive rack with respect to the transfer bar in a stroke adjustable manner along the transport direction.

(2) Action If the drive rack that drives the handling arm via the pinion and driven rack moves relative to the transfer bar in one direction along the workpiece conveyance direction, the pair of front and rear handling arms at each processing station will move toward the transfer bar. When the drive rack moves toward each other along the transfer bar and the drive rack moves relative to the other, the pair of front and rear handling arms of each processing station moves away from each other along the transfer bar. Therefore, by simply adjusting the reciprocating stroke of the drive rack along the workpiece conveyance direction with respect to the transfer bar using the reciprocating drive mechanism, the mutual spacing between the front and rear handling arms at each processing station along the workpiece conveyance direction can be freely adjusted. Therefore, the holding position of the workpiece holding means such as a suction cup that moves following the handling arms with respect to the workpiece can be adjusted and changed as appropriate in the conveyance direction according to the shape of the workpiece.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIG. The first to fifth processing stations S ₁ to S ₅ are set at equal intervals,
Each processing station S ₁ to _{S 5} works together to process the workpiece W.
Lower dies 3 ₁ to 3 ₅ and upper dies 4 ₁ to 4 ₅ for press working are provided, respectively. In other words, lower mold 3
₁ to 3 ₅ are fixed to a bolster 6 on a base 5 at equal intervals along the conveying direction 2, and a holder 8 fixed to a lifting platform 7 has a holder 8 corresponding to each lower mold 3 ₁ to 3 ₅ . The upper molds 4 ₁ to 4 ₅ are supported respectively. A conveying device 9 is attached to this press machine 1, and after pressing the lower dies 3 ₁ to 3 ₅ and the upper dies 4 ₁ to 4 ₅ by lowering the lifting table 7, the conveying device 9 is activated to move the workpieces. W
are sequentially transported to the next processing station along the transport direction 2.

The conveyance device 9 includes a pair of transfer bars 10, 11 arranged parallel to the conveyance direction 2 on both sides of each processing station _S1 to _S5 , and a conveyance direction constructed across the transfer bars 10, 11. It has a plurality of handling arms A1a, A1b...A5a, A5b which are movable back and forth along 2. These handling arms A1a, A1b
...A5a, A5b and transfer bar 1
The work W is transported by moving the workpieces 0 and 11, and the structure is that each processing station S ₁ to _{S 5}
Both are similar, and the explanation will be given below based on the drawings of the vicinity of the first processing station _S1 .

Referring also to FIG. 2, both transfer bars 10 and 11 extend from the first processing station _S1 to 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. The 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, 11. Further, guide rods 19 are provided 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 1
A support plate 43 fixed to the second rotating shaft 34 facing the
A cylindrical regulating member 44 is interposed between the adjusting plate 41 and the other regulating plate 41 . Therefore, both adjusting plates 40,
41 is prevented from moving along the axial direction of the second rotating shaft 34 and comes into sliding contact with the rotating plates 38 and 39.

The Geneva arms 22 are disposed at a plurality of locations, for example, three locations, 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 which are provided and extend radially inward toward one side in the circumferential direction. Therefore, by angularly displacing the adjusting plates 40 and 41 relative to the rotating plates 38 and 39, each Geneva arm 2
2 has rotating plates 38 and 39 so that the amount of protrusion of the roller 45 at its free end from the second rotating shaft 34 changes.
and moves along the radial direction of the adjustment plates 40 and 41.

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 adjusting 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 rotating shaft 34, and further The adjusting plate 40 is angularly displaced relative to the rotary plates 38 and 39.

In the middle of the third rotating shaft 35, 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, from the start of the operation of the drive source for the lifting table 7, that is, from the start of the lifting and lowering operation of the lifting table 7, for a period of time corresponding to the amount of protrusion of the Geneva arm 22,
The operating rotational movement of the third rotating shaft 35 can be delayed, and 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 rotating 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. The 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. a fourth gear 53 that meshes with the third gear 51; a pair of cams 54 fixed to both ends of the cam shaft 52; a link shaft 55 rotatably disposed about an axis parallel to the cam 52; is fixed to a link shaft 55, and a pair of swing arms 57 have a cam roller 56 that is in sliding contact with the cam 54 supported at the other end.
and a pair of first ones, one end of which is fixed to the link shaft 55.
A pair of second links 6 whose one end is connected to the other end of the first link 58 and the other end is connected to the traveling vehicle 18 via the link 58 and a pin 59 parallel to the link shaft 55.
0. 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 _S1. ~ _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 S ₁ to S ₅
A driven rack 67 facing the drive rack 66 is provided on each of the front handling arms A1a to A5a along the transport direction 2, and a rear handling arm A1b along the transport direction 2 at each of the processing stations _S1 to _S5 . ~A5b, driven racks 68 facing the drive rack 66, and transfer bars 10, 1 interposed between one of the driven racks 67 and the drive rack 66.
1, and a pair of second pinions 7 interposed between the other driven rack 68 and the driving rack 66, supported pivotally on the transfer bars 10 and 11, respectively, and meshing with each other.
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
is movable back and forth along the conveyance direction 2 while slidingly contacting the sides of both transfer bars 10 and 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 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 A1a to A5a via the pair of pinions 70, 71 and the rack 68.
The handling arms A1a-A5a move in the same direction as the drive rack 66. Therefore, the handling arms A1a, A2a 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. is on standby between each processing station S ₁ to S ₅ , and when transport starts, each handling arm A1a, A1b...A5
The rotational direction of the arm drive source 73 is controlled so that a and A5b move onto the corresponding processing stations _S1 to _S5 . Further, if the amount of rotation of the arm drive source 73 in the forward and reverse directions is adjusted appropriately by the control means 85, the transfer bar 1 of the drive rack 66 can be
The back and forth reciprocating stroke amount along the conveyance direction 2 with respect to 0, 11, and therefore each processing station S ₁ ;
S ₂ ; A pair of front and rear handling arms A at...
1a, A1b; A2a, A2b;... can be changed as appropriate at their mutual spacing at their closest positions. The arm drive source 73, control means 85, power transmission mechanism 75 and drive pinion 72 cooperate with each other to move the drive rack 66 to the transfer bar 10,
11, constitutes a reciprocating drive mechanism D of the present invention for reciprocating along the conveyance direction 2 with an adjustable stroke.

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, the operation of this embodiment will be explained. After the press working by the lower molds 3 ₁ to 3 ₅ and the lower molds 4 ₁ to 4 ₅ at each processing station S ₁ to S ₅ , the conveying device 9 is activated and each processing The work W on the stations S ₁ to _{S 5} is transported to the next processing station S ₂ to _{S 5} and the discharge position. That is, when the lifting operation of the lifting table 7 and the upper molds 4 ₁ to 4 ₅ integrated therewith is started, the arm driving means 65 is first activated to move the corresponding handling arm on each processing station S ₁ to _{S 5} . A1a, A1b...A5a, A5b move. Next, each handling arm A1a, A
1b...Workpiece W corresponding to A5a and A5b
is held, both transfer bars 10 and 11 are moved upward by the driving means 21, and then horizontally moved forward in the transport direction 2 to transport each workpiece W onto the next processing station, and then Descend. Therefore, each handling arm A1
By releasing the holding state of each workpiece W by a, A1b, . . . A5a, and A5b, the 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 A
1a, A1b...A5a, A5b return between each processing station _S1 to _S5 . Therefore, there are no obstacles to the press working at each of the processing stations _S1 to _S5 , and the workpiece W is pressed by the lowering movement of the lifting table 7 and the upper dies ₄₁ to ₄₅ .

In this way, the workpiece W is sequentially transported from the first processing station _S1 to the fifth processing station _S5 while repeatedly pressing and transporting the workpiece W, thereby completing a series of pressing operations.

In such a transfer device 9, each handling arm A1a, A1b...A5a, A5b moves to standby between each processing station _S1 to _S5 during press processing, so conventionally the handling arms are retracted to the side. Compared to the case where the standby movement was done in the same way, the time required for the standby movement is shorter and there is no need to interrupt the press working operation.
Smooth press work is performed. Moreover, the pair of handling arms A1a, A1b...A5a, A
Since the workpiece W is held by the handle 5b, the workpiece W can be stably held.

In addition, at each processing station S ₁ ; S ₂ ;..., a pair of front and rear handling arms A1a, A1b;
2a, A2b; at the closest position and at the farthest position, the control means 85 appropriately adjusts the amount of rotation of the arm drive source 73 in the forward and reverse directions, so that the distance between the drive racks 66 and 2a, A2b; The amount of back and forth reciprocating stroke along the transfer direction 2 relative to the transfer bars 10 and 11 can be easily adjusted by appropriately setting the suction cup of each handling arm to hold the workpiece W in accordance with the shape of the workpiece W. The work W can be held reliably by adjusting the position, 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 handling arm having the same configuration as the part.

C. Effects of the Invention As described above, according to the present invention, a lower mold and an upper mold that can cooperate with each other to plastically process a workpiece are respectively provided, and are spaced apart from each other along the conveyance direction of the workpiece. For sequentially transporting workpieces between multiple processing stations set up in
A pair of transfer bars, which are a transfer device in a plastic processing machine, are arranged on both sides of each processing station, extend along the transfer direction, and are capable of reciprocating in the vertical and longitudinal directions;
For each processing station, a pair of handling arms are arranged in parallel in the front and back in the transport direction, and each of the handling arms is supported at both ends by the transfer bars so as to be movable back and forth along the transport direction. a workpiece holding means such as a suction cup, and an arm driving means capable of driving a pair of front and rear handling arms corresponding to each processing station so as to be able to approach and separate from each other along the conveyance direction, and the arm driving means:
Driven racks are fixed to both ends of each of the handling arms along the conveyance direction; an extending drive rack, a driven rack of one of a pair of front and rear handling arms corresponding to each processing station, and a single first pinion interposed between the drive racks and pivotally supported by a transfer bar; A pair of second pinions are interposed between the other driven rack and the drive rack and are each pivotally supported by the transfer bar and mesh with each other, and the drive rack is moved along the conveyance direction with respect to the transfer bar. and a reciprocating drive mechanism for adjustable reciprocating drive, so that the reciprocating stroke of the drive rack that drives the handling arm through the pinion and the drive rack along the workpiece conveyance direction with respect to the transfer bar can be appropriately adjusted by the reciprocating drive mechanism. By simply doing this, you can freely adjust the distance between the front and rear handling arms of each processing station along the workpiece conveyance direction. Since the holding position for the workpiece can be adjusted and changed as appropriate in the transport direction according to the shape of the workpiece, even if the shape of the workpiece is changed, the handling arm can always accurately hold the workpiece in response to the change in shape. Can be done.

Furthermore, since the workpiece can be held by a pair of handling arms for each processing station, the workpiece can be held stably.
Moreover, the retracting operation of the handling arm is performed by simultaneously moving the pair of handling arms at each processing station in the direction of separating them from each other, which speeds up the retracting operation and contributes to improving the work efficiency of plastic working. .

Furthermore, since the drive rack and its reciprocating drive mechanism can be used in common to drive all the handling arms, the configuration of the device can be simplified and costs can be reduced.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an overall schematic side view, FIG. 2 is an enlarged plan view of the main part of FIG. 1, and FIG. 3 is a view taken along the - line in FIG. FIG. 4 is an enlarged sectional view taken along the - line in FIG. 2, FIG. 5 is a plan view showing the structure of the driving means, and FIG.
FIG. 7 is an enlarged cross-sectional view taken along the - line in FIG. 2. D...Reciprocating drive mechanism, 1...Press machine as a plastic processing machine, 2...Transfer direction, _31-35 ...Lower die, _41-45 ...Upper _die , 10 _, 11...Transfer Arbor, 66... Drive rack, 67, 68...
...Driven rack, 69...1st pinion, 70,7
1...Second pinion, A1a, A1b to A5a,
A5b...Handling arm, _S1 to _S5 ...Processing station, W...Workpiece.

Claims (1)

[Claims] 1 Lower molds 3 ₁ to 3 ₅ and upper molds 4 ₁ to 4 ₅ that can cooperate with each other to plastically process the work W are provided, and are spaced apart from each other along the transport direction 2 of the work W. Multiple machining stations configured
A transport device in a plastic processing machine for sequentially transporting the workpiece W between S ₁ and S ₅ , which is disposed on both sides of each processing station S ₁ to _{S 5} in the transport direction 2 . A pair of transfer bars 10 and 11 that extend along the line and can reciprocate in the vertical and longitudinal directions, and each processing station S ₁ to
In S ₅ , a pair of handling arms A1 are arranged in parallel in the front and rear of the conveyance direction 2, and each end portion is supported by the transfer bars 10 and 11 so as to be movable back and forth along the conveyance direction 2.
a, A1b;~A5a, A5b, work holding means such as suction cups provided on each handling arm A1a, A1b;~A5a, A5b, and a pair of front and rear handling arms A1a corresponding to each processing station _S1 to _S5 . , A1b; ~A5a, A5b along the conveyance direction 2 so as to be able to approach and separate from each other.
The arm driving means 65 faces driven racks 67, 68 fixed along the transport direction 2 at both ends of the handling arms A1a, A1b; - A5a, A5b, and the driven racks 67, 68. together with each of the transfer bars 10,1.
1, a drive rack 66 that is slidably supported along the conveyance direction 2 and extends in the conveyance direction 2, and a pair of front and rear handling arms A1a, A1b;~A5a, A5b corresponding to each processing station _S1 ~ _S5 .
A single first pinion 69 is interposed between one of the driven racks 67 and the driving rack 66 and is pivotally supported by the transfer bars 10 and 11.
A pair of second pinions 70 and 71 are interposed between the other driven rack 68 and the drive rack 66 and are pivotally supported by the transfer bars 10 and 11, respectively, and mesh with each other, and the drive rack 66 and a reciprocating drive mechanism D for reciprocating the transfer bars 10 and 11 along the transport direction 2 in a stroke adjustable manner.