JPH021573B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Object 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 disposed, which can cooperate with each other to plastically process a workpiece.
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 The above-mentioned transfer device particularly includes a pair of transfer bars that are disposed on both sides of each processing station, extend along the transfer direction, and are capable of reciprocating in the vertical and longitudinal directions, and this transfer bar. A transfer bar driving means capable of reciprocating the transfer bar along the conveyance direction, 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. What is provided is conventionally known.

(3) Problems to be Solved by the Invention In the above-mentioned conventional transfer device, for example, after the upper mold has been raised, the waiting handling arm holds the workpiece, and the transfer bar is raised and moved to the next processing station. After completion of each of the lowering and lowering operations, the handling arm is generally released from the workpiece holding state, the workpiece is placed on the lower mold, and the handling arm is then returned to its original position.

By the way, in order to increase the operating rate of plastic processing machines, such as press machines, a system has already been adopted in which the operation of the transfer bar is started while the upper mold is rising, and in this case, depending on the shape of the workpiece, In this case, it becomes necessary to change the starting point of the transfer bar. For this reason, in the past, the operation start point of the transfer bar was adjusted using a plurality of cams, or the transfer bar was driven by a drive means that was completely independent of the operating drive source of the upper die. However, these methods are structurally complex and inevitably increase costs.

The present invention has been made in order to eliminate the drawbacks of such conventional devices, and provides a transfer device for a plastic processing machine that allows adjustment of the operation start point of a transfer bar in accordance with the shape of a workpiece with a simple structure. The purpose is to provide.

B. Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a lower die and an upper die that can cooperate with each other to plastically process a workpiece, and A conveying device in a plastic processing machine for sequentially conveying workpieces between a plurality of machining stations set at intervals along the conveyance direction of the plastic processing machine. A pair of transfer bars arranged and extending along the conveyance direction, a transfer bar driving means capable of reciprocating the transfer bars along the conveyance direction, and a workpiece holding means such as a suction cup are provided for each processing station. a handling arm provided therein; the transfer bar driving means includes a rotating shaft rotatably supported on a support base and interlocked with a drive source for operating the upper mold; A Geneva arm that is connected via an adjustment mechanism and whose distance from the center of rotation can be adjusted; a Geneva plate that is rotatably supported on the support base and has a groove into which the tip of the Geneva arm can fit; a transmission mechanism for converting the rotational motion of the plate into horizontal reciprocating motion and transmitting it to the transfer bar, the adjustment mechanism being fixed to the rotating shaft and capable of sliding in the radial direction on the base of the Geneva arm. a rotating shaft supported by the
An adjusting plate is fitted and supported by the rotating shaft so as to be relatively rotatable, and the adjusting plate is provided between the adjusting plate and the Geneva arm, and is arranged to move the Geneva arm relative to the rotating plate in the radial direction in conjunction with the relative rotation between the adjusting plate and the rotating shaft. The apparatus is characterized in that it includes a cam mechanism for sliding, and a pulse motor that is supported by the rotating shaft and can rotationally drive the adjusting plate to adjust the relative rotational position of the adjusting plate with respect to the rotating shaft.

(2) Action When the rotating shaft rotates in conjunction with the drive source for operating the upper mold, the Geneva arm that rotates integrally with it rotates the Geneva plate in conjunction with it, and the rotational movement is transmitted to the horizontal direction of the transfer bar via the transmission mechanism. Since the movement is converted into a reciprocating motion, the transfer bar performs a predetermined reciprocating motion along the conveyance direction in conjunction with the raising and lowering of the upper die.

Further, when it becomes necessary to change the starting point of the transfer bar due to a change in the shape of the workpiece, the pulse motor is operated to appropriately adjust the relative rotational position of the adjustment plate with respect to the rotation axis. According to this adjustment, by appropriately changing the amount of radial protrusion of the Geneva arm linked to the cam mechanism from the rotating shaft, it is possible to change the timing at which the tip of the Geneva arm starts engaging with the groove of the Geneva plate. Therefore, the operation start point of the transfer bar can be changed as appropriate according to the amount of change.

(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, for example a press machine 1, has a plurality of processing stations S ₁ , for example, first to second processing stations in this embodiment, along the conveyance direction 2 of a workpiece W.
~ _S5 are set at equal intervals, and each processing station _S1 ~ _S5 has lower dies ₃₁ ~ ₃₅ and upper dies ₄₁ ~ ₄₅ for working together to press workpiece W. Each is arranged. In other words, the lower molds 3 ₁ to 3 ₅ are the base 5
The upper molds 4 1 to 4 5 are fixed to the upper bolster 6 at regular intervals along the conveying direction 2, and the holders 8 fixed to the lifting platform 7 have upper molds 4 ₁ to 4 ₅ corresponding to the lower molds 3 ₁ to 3 ₅ . are supported 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 constructed between a pair of transfer bars 10 and 11 arranged parallel to the conveyance direction 2 on both sides of each processing station S ₁ to S ₅ and is constructed between the transfer bars 10 and 11 so that the conveyance direction 2 is parallel to the conveyance direction 2. It has a plurality of handling arms A1a, A1b...A5a, A5b that are movable back and forth along. 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. 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. 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 both ends 27 and 28 of the support base 29, there are second and third shafts 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 shafts 38 and 39 are prevented from moving along the axial direction of the second rotating shaft 34.
sliding into contact with.

The Geneva arm 22 is arranged at a plurality of positions, for example, three positions, 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 are provided and 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.

Therefore, the arcuate long hole 47 and the protrusion 46 are,
The rotating plates 38 and 39, the adjustment plates 40 and 41, the cam mechanism C, and the pulse motor PM cooperate with each other to configure the cam mechanism C of the present invention, and the rotating plates 38 and 39, the adjustment plates 40 and 41, the cam mechanism C, and the pulse motor PM cooperate with each other to adjust the rotation center of the Geneva arm 22. This constitutes the adjustment mechanism A of the present invention for adjusting the distance from.

Further, in the middle of the third rotating shaft 35, the rotating plate 3
Geneva plate 24 at the position corresponding to between 8 and 39
is fixed. For example, four grooves 23 extending in the radial direction are provided in the Geneva plate 24 at equal intervals in the circumferential direction, and each of the Geneva arms 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 can be delayed, and the delay time is also
It can be adjusted by controlling the amount of relative angular displacement with respect to 8 and 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 ends fixed to the link shaft 55 at one end.
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, 11
is moved horizontally and vertically along the conveyance direction 2, 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 pivotally supported by transfer bars 10 and 11 interposed between one rack 67 and the drive rack 66, and the other rack 68.
and a pair of pinions 7 interposed between the drive rack 66 and pivotally supported by the transfer bars 10 and 11.
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 the 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 has both transfer bars 10,1
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, 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 .

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 upper 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.
Handling arms A1a, A1b...A5a, A5b corresponding to each processing station _S1 to _S5 move. Next, each handling arm A1a,
When the corresponding workpiece W is held by A1b...A5a, A5b, both transfer bars 10, 11 are moved upward by the drive means 21, and then horizontally moved forward along the conveyance direction 2 for the next processing. Transport each workpiece W onto the station,
Descend further. Therefore, each handling arm A
1a, A1b...Each work W by A5a, A5b
By releasing the holding state, those works W are placed on the corresponding processing stations. 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 drive means 65, each handling arm A1a, A1b...A5a, A5b returns between each processing station _S1 to _S5 . Therefore, each processing station S ₁ to _{S 5} is free of anything that would impede press processing, and the lifting platform 7 and upper die 4 ₁ to
4 Pressing of the workpiece W is performed by the descending operation of _{step 5} .

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 processing is performed. Moreover, the pair of handling arms A1a, A1b...A5a, A5
Since the workpiece W is held at point b, the workpiece W can be stably held. Also, both handling arms A1a, A1b...A5 that form a pair
a, A5b and handling arms A1a, A1b on both sides of the stay 12...A5a, A5
Since the distance between b can be adjusted by controlling the arm driving means 65, the holding position can be adjusted according to the shape of the workpiece W to reliably hold the workpiece W. The spacing between stations S ₁ to _{S 5} can be set relatively small.

In addition, if it becomes necessary to change the operation start point of the transfer bars 10, 11 due to a change in the shape of the workpiece, the pulse motor PM is operated to appropriately set the relative rotational position of the adjusting plates 40, 41 with respect to the rotating shaft 34. do. According to this adjustment, the rotating plate 38 of the Geneva arm 22, which is interlocked with the cam mechanism C,
By appropriately changing the amount of radial protrusion from 39, the timing at which the tip of the Geneva arm 22 starts engaging with the groove 23 of the Geneva plate 24 can be changed. The operation start point of press machine 1 can also be changed as appropriate, so that transfer bars 10 and 11 can start their operation at the optimum timing in response to changes in the shape of the workpiece, thereby increasing the operating rate of press machine 1. be able to.

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 . A handling arm having a similar configuration may be provided.

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.

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 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 transfer device in a plastic processing machine, comprising a pair of transfer bars disposed on both sides of each processing station and extending along the transfer direction, and a transfer bar drive capable of reciprocating the transfer bars along the transfer direction. and a handling arm having a workpiece holding means such as a suction cup and provided for each processing station, and the transfer bar driving means is operatively connected to a drive source for operating the upper die. A rotating shaft rotatably supported on a support base, and connected to this rotating shaft via an adjustment mechanism,
A Geneva arm whose distance from the center of rotation can be adjusted; a Geneva plate rotatably supported on the support base having a groove into which the tip of the Geneva arm can fit; a transmission mechanism for converting the transmission into the transfer bar, and the adjusting mechanism includes a rotating plate fixed to the rotating shaft and slidably supporting the base of the Geneva arm in the radial direction;
An adjusting plate is fitted and supported by the rotating shaft so as to be relatively rotatable, and the adjusting plate is provided between the adjusting plate and the Geneva arm, and is arranged to move the Geneva arm relative to the rotating plate in the radial direction in conjunction with the relative rotation between the adjusting plate and the rotating shaft. The drive source for operating the upper mold includes a cam mechanism for sliding, and a pulse motor supported by the rotating shaft and capable of rotationally driving the adjusting plate to adjust the relative rotational position of the adjusting plate with respect to the rotating shaft. When the rotating shaft rotates in conjunction with the rotating shaft, the Geneva arm that rotates integrally with the rotating shaft is rotated in conjunction with the Geneva plate, and the rotational motion can be converted into a horizontal reciprocating motion of the transfer bar via the transmission mechanism, Therefore, the transfer bar can be caused to accurately perform a predetermined reciprocating motion along the conveyance direction in conjunction with the raising and lowering of the upper die. In particular, by adjusting the relative rotational position of the adjusting plate with respect to the rotating shaft using the pulse motor, the amount of radial protrusion of the Geneva arm interlocked with the cam mechanism from the rotary plate can be changed appropriately, and the Since the timing at which the plate starts to engage with the groove can be changed, the starting point of the transfer bar can also be changed accordingly. Therefore, the transfer bar can be adjusted in response to changes in the shape of the workpiece. Operation can be started at the optimal timing, which can greatly contribute to improving the operating rate of the plastic processing machine. Moreover, in order to change the operation start point of the transfer bar, it is sufficient to simply change the operating amount of the pulse motor, and there is no need to separate the drive source for the upper mold and the drive source for the transfer bar, so that the overall effect is improved. The structure is simple and can contribute to cost reduction.

In addition, the adjustment mechanism for adjusting the distance from the center of rotation of the Geneva arm can be installed all at once on the rotation axis, and can also be made into a unit, making it easier to handle during assembly and maintenance of the device. It's easy.

[Brief explanation of drawings]

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 sectional view, Figure 4 is an enlarged - line sectional view of Figure 2, Figure 5
The figure is an enlarged plan view showing the configuration of the driving means, FIG. 6 is a sectional view taken along the line - - of FIG. 5, and FIG. 7 is a - line sectional view of FIG. 2.
The enlarged line sectional view, FIG. 8, is an overall schematic side view corresponding to FIG. 1 of another embodiment of the present invention. _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, 21... Drive means, 22... Geneva arm, 23... Groove, 24... Geneva plate, 25
...Transmission mechanism, 30...Rotating shaft, 38, 39...
Rotating plate, 40, 41... Adjustment plate, 43... Support plate,
47...Long hole, A1a, A1b to A5a, A5
b, A1-A5...Handling arm, A...
Adjustment mechanism, C...cam mechanism, PM...pulse motor, _S1 to _S5 ...machining station, W...work.

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 . Each processing station has a pair of transfer bars 10, 11 extending along the conveyance direction, a transfer bar drive means 21 capable of reciprocating the transfer bars 10, 11 along the conveyance direction 2, and a workpiece holding means such as a suction cup.
Handling arm A1 provided for each S ₁ to S ₅
a, A1b to A5a, A5b; A1 to A5, and the transfer bar drive means 21 is interlocked with a drive source for raising and lowering the upper molds 4 ₁ to 4 ₅ and rotates on the support base 29. A freely supported rotary shaft 34, a Geneva arm 22 connected to the rotary shaft 34 via an adjustment mechanism A and whose distance from the center of rotation can be adjusted, and a groove 23 into which the tip of the Geneva arm 22 can be fitted. 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. The adjustment mechanism A includes rotating plates 38 and 39 that are fixed to the rotating shaft 34 and slidably support the base of the Geneva arm 22 in the radial direction, and are fitted to the rotating shaft 34 so as to be relatively rotatable. Supported adjustment plate 4
0, 41, the adjustment plates 40, 41, and the Geneva arm 22, and the Geneva arm 22 is interlocked with the relative rotation between the adjustment plates 40, 41 and the rotating shaft 34.
A cam mechanism C that slides relative to the rotating plates 38 and 39 in the radial direction, and a cam mechanism C that is supported by the rotating shaft 34,
A conveying device for a plastic processing machine, comprising a pulse motor PM capable of rotationally driving the adjusting plates 40, 41 in order to adjust the relative rotational positions of the adjusting plates 40, 41 with respect to the rotating shaft 34.