JPH0211933Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial application field The present invention is designed to provide a method for forming a workpiece so that a lower mold and an upper mold are respectively disposed for cooperatively plastically working the workpiece. The present invention relates to a transport device in a plastic processing machine for sequentially transporting the workpieces between a plurality of processing stations set at intervals in the transport direction.

(2) Conventional technology Conventionally, in such a transfer device, a handling arm capable of holding a workpiece is fixed to transfer bars placed on both sides or one side of each processing station, and the vertical movement and horizontal movement of the transfer bar are combined. The workpiece is being transported.

(3) Problems to be solved by the invention However, in the past, the vertical and horizontal movement of the transfer bar was performed by a single driving means, which inevitably required large driving energy. Ta.

Therefore, the applicant has already proposed a conveying device in which vertical and horizontal movement of the transfer bar is performed by separate driving means (patent application
No. 59-8097 (see Japanese Unexamined Patent Publication No. 174297/1983). However, even in this proposal, since the entire transfer bar is driven, rigidity of the transfer bar is required, and as the plastic processing machine becomes larger, the driving means must also become larger. This not only resulted in an increase in equipment costs, but also resulted in problems such as an increase in the equipment space for the driving means.

In addition, in order to stably hold the workpiece, it is desirable to use a handling bar to hold the workpiece over a relatively wide range, but during plastic processing, the handling bar must be placed on standby between each processing station. In order to reduce the overall size by reducing the interval between the bars, it is necessary to minimize the space occupied by the handling bar during standby.

The present invention was developed in view of the above circumstances, and aims to reduce the power required to transport the workpiece, downsize the drive means, and move a pair of handling arms to each other without using a particular drive source. It is an object of the present invention to provide a conveyance device for a plastic processing machine that can stably hold a workpiece and reduce the distance between processing stations by moving them closer to each other and moving them away from each other.

B. Structure of the invention (1) Means for solving the problem According to the invention, a pair of guide rails are arranged so as to be movable up and down on both sides of each processing station along the conveyance direction; A plurality of arm carts are arranged in pairs, and each pair is connected to each other, and is movable on the guide rail; A pair of arm carts are installed between the pair of arm carts, and each arm cart is arranged in pairs. a handling arm that is movable back and forth relative to the workpiece and capable of holding the workpiece; disposed at one end of both the guide rails so as to be movable along the conveyance direction;
a pair of driving carts connected to each arm cart on both guide rails; a driven rack fixedly attached to both ends of each handling arm in parallel with the conveying direction; all arm carts on the guide rails and a driving rack; A pair of drive racks are movably disposed between the carts and are opposed to each of the driven racks; a pinion interposed between the racks; a cam follower rotatably supported by each of the driving carts; a cam fixedly arranged on the side of each driving cart and capable of abutting the cam follower; a cam of the cam follower; a drive pinion that is supported by the drive truck and meshes with the drive rack to rotate in response to the rotation; a drive mechanism for driving the drive truck to travel; and an elevating drive for raising and lowering the guide rail. It comprises means and;

(2) Action By running the drive cart on the guide rail by the drive mechanism, each arm cart moves horizontally, and when the guide rail is raised and lowered by the lifting drive means, the arm cart also moves up and down, and these combinations This makes it possible to transport workpieces between processing stations. Further, when the drive truck moves on the guide rail, the cam follower is rotated by the cam, the drive pinion is rotated accordingly, and the drive rack is moved in its longitudinal direction. As a result, the pair of handling arms of each arm carriage move away from each other when holding a workpiece, and move toward each other when waiting between processing stations.

(3) Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, in FIG. 1, a press machine 1 as a plastic processing machine includes a plurality of processing stations, For example, 1st to 5th
Processing stations S ₁ to _{S 5} are set at equal intervals, and each processing station S ₁ to _{S 5} has lower molds 3 ₁ to 3 ₅ and upper molds 4 ₁ for working together to press work W. ~ ₄₅ are arranged respectively. That is, the lower molds 3 ₁ to 3 ₅ are fixed to the bolsters 6 of the base 5 at equal intervals along the conveyance direction 2, and the lower molds 3 1 to 3 5 are fixed to the holder 8 fixed to the lifting table ₇ . Upper molds 4 ₁ to 4 ₅ are supported corresponding to molds 3 ₅ , respectively. A conveying device 9 is attached to this press machine 1, and lower molds 3 ₁ to 3 ₅ and upper molds 4 ₁ to 4 ₅ are moved by lowering the lifting table 7.
The press machine and the transport device 9 are operated, and the workpiece W is transported along the transport direction 2. That is, the workpiece W is transported from the carry-in station Si at the rear end along the conveyance direction 2 to the carry-out station So at the front end along the conveyance direction 2 via the first to fifth processing stations S ₁ to S ₅ of the press machine 1 . They are sequentially transported by the transport device 9 each time the press is operated.

The conveyance device 9 includes a pair of main guide rails 10, 10 arranged parallel to the conveyance direction 2 on both sides of the carry-in station Si, the first to fifth processing stations _S1 to _S5 , and the carry-out station So, and both main guides. Multiple sets, for example 6, movable on the rails 10, 10
A pair of arm carts 11 and a pair of arm carts 1
A pair of handling arms 12a and 12b are provided between the handlebars 1 and 11, respectively.

Each of the arm carts 11 and handling arm 1
Configurations such as 2a and 12b are loading stations.
Si, the first to fifth processing stations _S1 to _S8 , and the unloading station So are all basically the same, and hereinafter, the configuration will mainly be explained only around the fifth processing station _S5 .

In FIGS. 2 and 3, both main guide rails 10, 10 are arranged horizontally and parallel to each other along the transport direction 2. In FIGS. On the lower surface of each main guide rail 10, 10, support rods 13 extending downward are fixed at positions spaced apart in the longitudinal direction, and each support rod 13 is supported by a column 14 so as to be movable up and down. Ru. That is, both main guide rails 10, 10 are supported by the support column 14 so as to be movable up and down.

Paired arm carts 11, 11 are arranged before and after each of the first to fifth processing stations _S1 to _S5 , and are arranged on main guide rails 10, 10 so as to be able to run back and forth along the conveyance direction 2, Each arm carriage 11 on the same main guide rail 10 is connected to each other by a connecting bar 15. Therefore, each arm truck 11 travels in conjunction with each other.

In Figures 4 and 5, each arm truck 1
1, there is a sub-guide rail 1 parallel to the transport direction 2.
6 and 17, respectively, and handling arms 12a and 12b movable on the sub-guide rails 16 and 17 are installed between the pair of arm carriages 11 and 11, respectively. That is, on the front side along the conveyance direction 2, both arm carts 11, 11
A handling arm 12a is installed between the two arm carts 11, 1 on the rear side along the conveyance direction 2.
A handling arm 12b is installed between the two. In this way, each handling arm 12
a and 12b are movable back and forth relative to each arm carriage 11 along the transport direction 2.

Suction cups (not shown) are provided at the lower portions of the handling arms 12a, 12b, and the work W is held by these suction cups.

Referring to FIGS. 6 and 7 together, the traveling drive means 18 for driving each arm truck 11 on the main guide rails 10, 10 to travel in the transport direction 2
It is provided with drive carts 19, 19 that can travel on main guide rails 10, 10 on the front end side along the , and a drive mechanism 20 that drives these drive carts 19, 19.

Each drive truck 19, 19 has a main guide rail 1
0 and 10 are connected to arm carts 11 and 11 near drive carts 19 and 19 via connection bars 15 and 15, respectively. Further, the drive mechanism 20 includes both drive carts 19,
A drive source 21 such as a motor fixedly disposed on the floor between 19 and 19, horizontal drive shafts 22, 22 extending from the drive source 21 to both sides, and those drive shafts 2.
It consists of swing arms 23, 23 whose base ends are fixed to the ends of wheels 2, 22, and whose tips extend upward and are connected to respective drive carts 19, 19. A long hole 24 extending in the longitudinal direction is provided at the tip of each swing arm 23, 23.
Pins 25 protruding from the sides of the driving carts 19, 19 are fitted into the pins 4, respectively. Therefore, by operating the drive source 21 and swinging the swing arms 23, 23 left and right, the drive carts 19, 19 reciprocate on the main guide rails 10, 10, and each arm cart 11 is also driven. It is pulled or pressed by carts 19, 19 and reciprocates on main guide rails 10, 10.

In order to move each handling arm 12a, 12b back and forth relative to each arm carriage 11, a drive rack 26 extending between the drive carriage 19 and each arm carriage 11 is provided on both main guide rails 10, 10. Each of the racks 26 is disposed so as to be movable along its longitudinal direction, and one end of the drive rack 26 is connected to the rack drive means 2 provided on the drive cart 19.
7.

In FIG. 8, driven racks 28 along the transport direction 2 are fixedly installed at both ends of the handling arm 12a on the front side along the transport direction 2 so as to face the drive rack 26. As shown in FIG. A pair of pinions 29 and 30 that mesh with each other are interposed between the driven rack 28 and the drive rack 26, and both pinions 29 and 30 are rotatably supported by the arm truck 11. As a result, the driven rack 28, ie, the handling arm 12a,
It moves in the same direction as the direction of movement of the drive rack 26.

In FIG. 9, driven racks 31 along the transport direction 2 are fixedly installed at both ends of the rear handling arm 12b along the transport direction 2 so as to face the drive rack 26. As shown in FIG. Moreover, a single pinion 32 rotatably supported by the arm truck 11 is interposed between the driven rack 31 and the drive rack 26. The driven rack 31, ie the handling arm 12b, therefore moves in the opposite direction to the direction of movement of the drive rack 26.

Referring also to FIG. 10, the rack drive means 2
Reference numeral 7 denotes a horizontal rotating shaft 33 that is rotatably supported by the driving truck 19, and a driving pinion 34 that is fixed to the rotating shaft 33 and meshes with the driving rack 26.
, a large diameter gear 35 fixed to the rotating shaft 33 , a small diameter gear 36 fixed to the rotating shaft 33 , and a large diameter gear 35 fixed to the rotating shaft 33 .
A rotating shaft 37 is rotatably supported on the drive cart 19 in parallel with the rotating shaft 37, and the rotating shaft 37 is mounted on the rotating shaft 37 in a manner that allows relative movement in the axial direction but prevents relative rotation. A selection gear 38 that can selectively mesh with the large-diameter gear 35 and the small-diameter gear 36 and a protruding end of the rotating shaft 37 from the drive cart 19 are configured to allow relative movement in the axial direction but prevent relative rotation. A rotary body 39 mounted on the rotary body 39, an arm 40 extending diagonally upward from the rotary body 39 toward the front side along the conveyance direction 2, and a roller 41 as a cam follower pivotally supported at the tip of the arm 40. and a cam 42 disposed on the side of the drive truck 19 so as to bring the roller 41 into contact with the cam 42 .

The selection gear 38 is held by a first holding member 43 , which passes through the drive cart 19 so as to be movable in a direction parallel to the axis of the rotation shaft 37 , and is attached to the lever 44 . Pin-bonded to the end. An intermediate portion of the lever 44 is rotatably supported on the driving cart 19 by a vertical shaft 45.
The first holding member 43 moves the selection gear 38 in the axial direction of the rotation shaft 37 in response to the rotation operation. As a result, the meshing state between the selection gear 38, the large diameter gear 35, and the small diameter gear 36 is switched.

A support frame 4 is provided at the end of the main guide rails 10, 10.
6 is fixedly provided, and a cam 42 is provided on the upper surface of one side plate 47 of this support frame 46. That is, on the upper surface of the side plate 47, there is a first inclined surface 48 that slopes upward in order from the rear side to the front side along the conveyance direction 2, and as it goes forward in the conveyance direction 2,
A horizontal surface 49 and a second sloped surface 50 that slopes downward toward the front in the conveying direction 2 are provided, and a cam 42 is configured by the first sloped surface 48, the horizontal surface 49, and the second sloped surface 50. .

The rotating body 39 is held by a second holding member 51, and the second holding member 51 is a piston of a cylinder 52 supported by the drive cart 19 with an axis parallel to the rotating shaft 37. It is connected to a rod 53. Therefore, in response to the expansion and contraction of the cylinder 52, the rotating body 39
is moved in the axial direction of the rotation shaft 37 by the second holding member 51. That is, when the cylinder 52 is extended, the rotating body 39 is in a position where the roller 41 is brought into contact with the cam 42, and when the cylinder 52 is contracted, the rotating body 39 is in a position where the roller 41 is brought into contact with the cam 42.
Move to a position where it retreats to the side.

Further, the arm 40 is biased by a spring in the direction of bringing the roller 41 into contact with the cam 42, and rotation of the arm 40 in the spring biased direction is regulated by a stopper (not shown) provided on the drive cart 19. be done.

The elevating drive means 54 for elevating the two main guide rails 10, 10 includes a rack 55 that is continuously and integrally provided on each support rod 13, and a pinion 56 that meshes with the rack 55 within each support column 14. Equipped with
Both main guide rails 10,
10 moves up and down.

Next, the operation of this embodiment will be explained. During press processing using the lower molds _{3 1 to} 3 ₅ and the upper molds 4 ₁ to 4 ₅ at each of the processing stations S 1 to S ₅ , each arm cart 11 is moved to the loading station Si and 1st
Between processing station ₁ , between first and second processing stations S ₁ and S ₂ , between second and third processing stations S ₂ and S ₃ , and between third and fourth processing stations
Between _S3 and _S4 , the fourth and fifth processing stations _S4 ,
The roller 41 is on standby between S ₅ and the fifth processing station S ₅ and the unloading station So.
is in contact with approximately the center of the horizontal surface 49 of the cam 42. In this state, the handling arm 12
a and 12b have moved to the center side of each arm truck 11.

When the press working at each processing station S ₁ to _{S 5} is completed, the drive truck 19 moves to the loading station by the action of the travel drive means 18.
It is moved back to be located approximately at the center of Si and each of the processing stations S ₁ to S ₅ . Due to this backward movement of the driving truck 19, the roller 41 is moved to the cam 42.
It rolls from the horizontal surface 49 to the first inclined surface 48 at . Therefore, the arm 40 rotates clockwise in FIG.
8. Transmitted to the rotating shaft 33 via the large diameter gear 35 or the small diameter gear 36, and the rotating shaft 33 is transmitted to the rotating shaft 37
angular displacement in the opposite direction. That is, drive pinion 3
4, the drive rack 26 is moved forward in the transport direction 2.

This forward movement of the drive rack 26 causes the handling arm 1 to move forward with respect to the arm truck 11.
2a moves forward and the handling arm 12 on the rear side
b moves backwards. Therefore, when each arm truck 11 retreats to a predetermined position, the handling arms 12a, 12b are separated from each other. Therefore, when the lift drive means 54 is activated to lower both the main guide rails 10, 10, the loading station Si
The workpieces W of each processing station S ₁ to _{S 5} are moved over a relatively wide range by the handling arms 12a, 12.
It is stably held by b.

Here, the cylinder 52 is caused to contract, and the roller 41 is retracted to the side of the cam 42.
The main guide rails 10, 1 are moved by the lifting drive means 54.
Increase 0.

Next, the drive truck 19 is moved by the travel drive means 18.
is run forward along the conveyance direction 2, and each arm cart 11 moves to the first to fifth processing stations S ₁
When the main guide rails 10, 10 are lowered by the lifting/lowering drive means 54 when the main guide rails 10, 10 are lowered when the main guide rails 10, 10 are approximately at the center of ~ _S5 and the unloading station So. As a result, each workpiece W has been brought to the next processing station S ₁ to S ₅ and the unloading station So.

When each workpiece W is placed on each of the lower molds 3 ₁ to 3 ₅ of the processing stations S ₁ to _{S 5} and on the unloading station So, the main guide rail 1 is moved by the elevating drive means 54.
0 and 10 are raised, and the cylinder 52 is operated to extend. As a result, the roller 41 comes into contact with the second inclined surface 50 of the cam 42. Therefore, the drive truck 19 is moved from the travel drive means 18.
is moved to the rear side along the conveyance direction 2.

Due to this backward movement of the driving cart 19, the roller 4
1 rolls on the second inclined surface 50, and the rotation shaft 37 rotates counterclockwise in FIG. Therefore, the rotation shaft 33 and the drive pinion 34 angularly displace the rotation shaft 37 in opposite directions, and the drive rack 26 moves rearward in the transport direction 2. Therefore, in each arm truck 11, handling arms 12a,
12b move toward each other, and the rollers 4
1 reaches approximately the center of the horizontal plane 49, each arm truck 11 is positioned between the carry-in station Si, the first to fifth processing stations _S1 to _S5 , and the carry-out station So, as shown in FIG. As a result, the handling arms 12a, 12b are also positioned close to each other, and the space occupied by the handling arms 12a, 12b is also reduced.

This completes the transport of the workpiece W by one operation of the transporting device 9, but by alternately operating the press 1 and the transporting device 9, the workpiece W
The pieces are sequentially conveyed and pressed.

According to this conveyance device 9, the main guide rail 1
0 and 10 are raised and lowered by the lifting drive means 54, and each arm carriage 11 travels on the main guide rails 10 and 10 by the traveling drive means 18, so vertical movement and horizontal movement are performed by both the drive means 54 and 18. The drive means 54,
The required power for 18 is relatively small, and miniaturization is achieved. Moreover, each handling arm 12
a, 12b can stably hold the workpiece W over a relatively wide range, and during standby, the space is small and the distance between the loading station Si, each processing station S ₁ to S ₅ , and the loading station So is small. Therefore, the overall size can be reduced.

Further, when the size of the workpiece W to be transported changes, the lever 44 is operated to shift the selection gear 38.
This can be dealt with by changing the meshing state between the large-diameter gear 35 and the small-diameter gear 36, and by changing the distance between the pair of handling arms 12a, 12b when they are maximally separated.

C. Effects of the invention As described above, according to the invention, a pair of guide rails are driven up and down by the elevating drive means, the drive cart is connected to a plurality of sets of arm carts movable on these guide rails, and the drive The cart is driven by a drive mechanism, and a handling arm capable of holding a workpiece is installed between the pair of arm carts on both sides of the processing station. The horizontal movement and the vertical movement can be shared by the drive mechanism and the lifting drive means, respectively, and the driving force can be reduced, making it possible to downsize the drive mechanism and the lifting drive means.

Furthermore, the handling arms are constructed in pairs between the pair of arm carts so as to be movable back and forth relative to the arm cart, and the driven racks fixed to each handling arm move the pair of handling arms toward each other. The drive rack is engaged with a drive pinion that is engaged with a cam follower that is engaged with a cam follower that is rotated by a cam in accordance with the movement of the drive truck, which is engaged with the drive rack via a selected number of pinions to be driven in the opposite direction. In particular, it is possible to move a pair of handling arms toward and away from each other without providing a driving source, and it is possible to stably hold a workpiece and reduce the space occupied by the handling arms during plastic working. It can contribute to overall miniaturization.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a general schematic side view, Fig. 2 is an enlarged side view of the main part of Fig. 1, Fig. 3 is a plan view of Fig. 2, and Fig. 4 is an enlarged side view of the main part of Fig. 1. Figure 5 is an enlarged plan view of the arm truck, Figure 5 is an enlarged side view of the arm truck, Figure 6 is an enlarged plan view of the drive truck, and Figure 7 is an enlarged plan view of the arm truck.
The figure is a sectional view taken along the - line in Fig. 6, Fig. 8 is a sectional view taken along the - line in Fig. 4, Fig. 9 is a sectional view taken along the - line in Fig. 4, and Fig. 10 is a view taken in the direction of the arrow in Fig. 6. . _DESCRIPTION OF _SYMBOLS 1...Press machine as a plastic processing machine, 2...Conveyance direction, _31-35 ...Lower die, _41-45 ...Upper die,
9... Conveyance device, 10... Guide rail, 11...
...Arm trolley, 12a, 12b... Handling arm, 19... Drive trolley, 20... Drive mechanism,
26... Drive rack, 28, 31... Driven rack, 29, 30, 32... Pinion, 34... Drive pinion, 41... Roller as cam follower, 42... Cam, 54... Lifting drive means, S ₁ ～
S ₅ ...Processing station, W...Work.

Claims (1)

[Scope of utility model registration request] The workpiece is sequentially moved between a plurality of processing stations set at intervals in the conveyance direction of the workpiece, in which a lower die and an upper die for cooperatively plastically working the workpiece are respectively disposed. In a conveyance device in a plastic processing machine for conveyance, a pair of guide rails are arranged so as to be movable up and down on both sides of each processing station along the conveyance direction; a plurality of sets are arranged in pairs on both sides of each processing station. At the same time, each set is connected to each other,
an arm truck movable on the guide rail;
a handling arm that is installed in pairs between the pair of arm carts, is movable back and forth relative to each arm cart, and is capable of holding the workpiece; conveyed to one end of both guide rails; a pair of driving carts arranged movably along the direction and connected to each arm cart on both guide rails; a driven rack fixed to both ends of each handling arm parallel to the conveyance direction; a pair of drive racks which are disposed movably between all the arm carts on the guide rail and between the drive cart and which face each of the driven racks; a pinion interposed between the driving rack and each driven rack; a cam follower rotatably supported by each driving truck; a cam that can be contacted; supported on the drive carriage to rotate in response to rotation by the cam of the cam follower;
a drive pinion that meshes with the drive rack; a drive mechanism for driving the drive cart; an elevating drive means for elevating and lowering the guide rail;
A conveying device for a plastic processing machine, characterized by comprising: