JPS6076938A - Workpiece conveying device - Google Patents

Abstract

PURPOSE:To improve work efficiency, by constituting a device such that both- side machining and one-side machining of a workpiece can be carried out without causing any necessity for changing the layout of a conveyer and the workpiece can be alternately machined by a plurality of headstocks when the one- side machining is carried out. CONSTITUTION:A workpiece conveying device is constituted by equipping workpiece delivery devices 300, 300, which receive an unmachined workpiece from a conveyer 100 to be delivered to a headstock 710 while receive a machined workpiece from this headstock 710 to be returned to the conveyer 100 by oppositely providing two sets of the headstocks 710, 710 in an intermediate part of the conveyer 100, and an inverting device 400 or the like being provided between these two sets of the devices 300, 300 and inverting the workpiece conveyed by the conveyer 100. Accordingly, the workpiece, when it is machined to be mass- produced, is conveyed bein left as it is without using the device 400 by driving the conveyer 100 at a pitch of two times or more. By this constitution, work efficiency can be substantially improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention comprises a conveyor and a workpiece transfer device, and the workpiece transfer device receives an unprocessed workpiece from the conveyor and transfers it to the processing section of the headstock. The present invention relates to a workpiece transfer device that receives processed workpieces from a processing section of a headstock, returns them to a conveyor, and sequentially transfers the workpieces.

[Prior art]

Conventionally, a work conveyance device for jinotane includes a conveyor for placing and conveying a workpiece, and a work+i device located at the starting end of the conveyor for placing an unprocessed workpiece fed from a work feeder onto the conveyor. a device, a chute located at the terminal end of the conveyor 4a for receiving the machined workpiece, and a chute located between the conveyor 4a that delivers the unprocessed workpiece to the headstock and receives the machined workpiece and returns it to the conveyor. It is configured with a work transfer device.

By the way, conventionally, it has been common to associate one conveyance device with one headstock.

Therefore, when machining both the front and back sides of a workpiece, firstly, after machining one side, the workpiece is reversed, the workpiece is conveyed to the edge headstock using the same conveyance device again, and the other side is machined. It is necessary to perform processing on the front surface and the back surface in sequence, or alternatively, it is necessary to arrange two conveyance devices # in advance and provide a reversing device between the two devices to sequentially perform processing on the front surface and the back surface. However, in the former case, since the work is performed twice using one set of devices, it takes time and effort to supply the workpieces, and the flow of the workpieces is poor, which has a negative effect on other work processes. On the other hand, in the latter case, the conveyor becomes longer as a whole, and
- When processing only the surface, there was a drawback that it was not easy to change the layout of the conveyor.

In this way, conventional transport devices can process both sides and one side of a workpiece without changing the layout.

Moreover, it was difficult to implement it quickly.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks, and allows a plurality of headstocks to be connected by a series of conveyors to perform double-sided and single-sided machining of a workpiece without changing the layout of all conveyors. In the case of surface machining, the aim is to provide a workpiece conveyance device that can process workpieces alternately using multiple headstocks, greatly improving work efficiency, and having both versatility and dedicated functionality. do.

[Structure of the invention]

The present invention aims to achieve the above object.

(a) A workpiece conveyor that places a workpiece on at least two headstocks arranged at a constant interval and sequentially conveys the workpiece; (b) A workpiece conveyor that is provided at the starting end of the conveyor and that is fed from a workpiece feeder. a workpiece mounting device that places the workpieces on the conveyor at regular intervals; (dl) A reversing device disposed between the work transfer devices and reversing the work conveyed by the conveyor.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing the configuration of one row of the workpiece conveying apparatus of the present invention, and FIG. 2 is a plan view thereof.

The embodiment shown in these figures includes a conveyor 100 that sequentially conveys workpieces to two headstocks 710 and 710 arranged at regular intervals on the Petsu r7oo, and a conveyor 100 provided at the starting end side of the conveyor 100. , a workpiece placement device 200 for placing the workpieces fed from the workpiece feeder 600 on the conveyor 100 at regular intervals; and two workpiece placement devices 200 are provided in the middle of the conveyor 100 corresponding to the headstocks 710 and 710, A workpiece delivery device 300°3 that receives unprocessed workpieces from the conveyor 100 and delivers them to the headstock 710, receives processed workpieces from the headstock 710, and returns them to the conveyor 100.
00, a reversing device 400 located between the two workpiece transfer devices 300 and 300 for reversing the workpieces conveyed by the conveyor 100, and a reversing device 400 located at the terminal end of the conveyor 100 for receiving processed workpieces. and a shooter 500.

The bed 700 is provided with a turning device 720 corresponding to the headstock 710 for transferring a workpiece between the headstock 710 and the workpiece transfer device 300.

Further, a tool rest 740 mounted on the saddle 730 is provided corresponding to each headstock 710.

The conveyor 100u, e.g., t, consists of a chain conveyor and has sprocket wheels 110, 110 at both ends,
It is connected to a motor 130 (FIG. 2) and driven by a Lusfrocket wheel 110.

This conveyor 100K has noglets 120 installed at regular intervals. This nozzle 120 is for placing and holding a workpiece, and by placing the workpiece on this nozzle 120, a constant spacing of the workpieces is realized. The arrangement pitch of the nozzles 120 is set in accordance with the pitch between the two work transfer devices 300° 300 and the reversing device 400 located between them. That is, in this embodiment, if the pitch between the workpiece transfer devices 300 and 300 is ThT, then the arrangement pitch of the pallets 120 is set to be L/3. However, the arrangement pitch of the grooves 120 is not limited to this.

9 and 3 installed above the starting end of the conveyor 10o.
It is constructed as shown in FIGS. That is, FIGS. 3 and 4 are sectional views of essential parts of the workpiece mounting apparatus used in the embodiment, and FIG. 5 is a plan view showing the holding mechanism in the apparatus.

In these figures, the workpiece placement device 200 mainly includes a holding mechanism 210 that holds the workpiece fed from the workpiece feeder 600, and a suppression mechanism 220 that pushes out the held workpiece and places it on the noglet 120 below. It is composed of

The holding mechanism 210 has three claws 211 that are each supported by a shaft 213 and are rotatable downward. The nail 21
Two of the conveyors 1 are provided facing each other in the width direction of the conveyor 100, and the remaining one is provided facing the work feeder 600 in the longitudinal direction of the conveyor 100. The tips of these three claws 211, 211, and 211 each protrude into the opening 240, and inside each claw, there are steps with corresponding heights to properly hold workpieces of various shapes. Section 212 is provided. The winter melon 211 in the casing is urged by a nonone 214 so as not to rotate downward due to the heavy stitching and its own weight.

A pressing mechanism 220 provided above the space surrounded by these claws 211 is attached to a cylinder 2 fixed by a mounting member 230.
21, a piston 222, and a pressure contact piece 223 attached to the tip of the piston 222. Pressure contact piece 22
3, a stepped portion 224 corresponding to the stepped portion Vc of the claw 2110 is provided below.

Hydraulic pressure or air pressure acts on the cylinder 221 in synchronization with the movement of the noglet 120 accompanying the movement of the conveyor 100, and pushes down the piston 222.

The transfer device 300 that transfers workpieces between the conveyor 100 and the headstock 710 is constructed as shown in FIG. 6 and FIG. 7. Here, FIG. 6 is a sectional view of the workpiece transfer device, and FIG. 7 is a sectional view of the main part of the transfer device as seen from the front side.

There are two work transfer devices 300, but since both have the same configuration, only one will be explained. This work transfer device 300 includes a horizontal movement mechanism 310 that moves itself in the width direction of the conveyor 100.
and a rotating arm 330 that grips a workpiece and rotates 90 degrees.
, a rotation drive mechanism 320 that rotates the arm 330 , a hand opening/closing mechanism 340 that opens and closes the hand that grips a workpiece with the arm 330 , and an interlock mechanism therebetween.

The horizontal movement mechanism 310 includes a piston 312 that is fixed to the bed side by a fixing part 3111C and is provided horizontally beyond the top of the conveyor 100, a cylinder 313 that is provided horizontally movably in the middle of the piston 312, and the piston A turning drive mechanism 320, which will be described later, is provided at the tip of 312.
and a cam follower 314 that engages with the piston. The tip of the cylinder 313 is connected to a bracket 321 and a cylinder 322 of a swing drive mechanism 320, which will be described later, to horizontally move them. Further, in this embodiment, a detector 350 constituting an interlock mechanism is attached to the fixed part 311, and is configured to detect the base end of the cylinder 3130 and hold the workpiece transfer device in the standby position. be.

The swing drive mechanism 320 includes a companion bracket 321 and a cylinder 323 that are connected vertically, a piston 322 that is mounted inside these so as to be able to move vertically, and the piston 32.
2, and a pinion 325 fixed to a shaft 335 of a swing arm 330, which will be described later. A matching groove 326 is provided. The binion 325 is rotated 090 degrees by the rack 324 which moves up and down as the piston 322 moves up and down, and the swing arm 330
Rotate the entire axis 335 90 degrees. That is, this pinion 3
25 is a configuration in which the swing arm 330 is raised to a vertical position when the piston 322 is at the highest position (the state shown in FIG. 6), and the arm 330 is brought to a horizontal position when the piston 322 is at the lowest position. has been done.

The above-mentioned swing arm 330 has two handles r 331°33
2 (Fig. 7), and a gripping claw 333 provided at the tip thereof,
334. The two hands 331 and 332 are connected via a hand opening/closing mechanism 340, and are also connected to the shaft 335 mentioned above. Gripping claws 333,3
34 are formed in a U-shape, are arranged opposite to each other, and grip the workpiece W. Note that the tips of the gripping claws 333 and 334 are formed obliquely inward in order to facilitate gripping of the workpiece.

- The hand opening/closing mechanism 340 is disposed in the same direction as the shaft 335, and has a nine piston 341 connected to the hand 331 at the intermediate portion, a cylinder 342 provided at the base end of the piston 3410, and connected to the piston 341. The rod 345 is connected to the hand 332 that is not connected to the piston 341 and is disposed in parallel with the piston 341, and a swivel joint 347 that supplies hydraulic or air pressure to the cylinder 342. and the two rods 343 and 346 facing each other.
are provided, and a pinion 344 is meshed between these two vines 343 and 346.

This workpiece transfer device 300 does not directly transfer the workpiece to and from the headstock 710! @equipment 720'ft
Do it through FIG. 8 shows the relationship between this turning device, the headstock, and the turret.

As shown in the figure, the turning device 720 includes two 7-arms 721 each having a work gripping portion 723, 724'e at the tip.
．． 722 It is arranged in a V-shape. Arm 721.722
is rotated counterclockwise in the drawing, and the front arm 7
21 grips the processed workpiece, and the rear arm 722
The structure is such that the unprocessed workpiece is gripped by the gripper. The reason why two arms are provided in this way is to improve the efficiency of attaching and detaching a workpiece to and from the chuck 711 of the headstock 710.

The reversing device 400 located between the work transfer devices 300 and 300 is constructed as shown in FIGS. 9L and 10. Here, FIG. 9 is a sectional view of a main part showing the reversing device used in this embodiment, and FIG. 9 is a front view thereof.

The reversing device 400 shown in these figures includes a workpiece gripping mechanism 420 that grips a workpiece, a rotation mechanism 410 that rotates the workpiece gripping mechanism 420 by 180 degrees, and a rotation mechanism 410 that rotates the workpiece gripping mechanism 420 by 180 degrees.
The hand opening/closing mechanism 430 opens and closes twenty hands.

The rotation mechanism 410 includes a cylinder 411, a piston 412 installed in the cylinder 411, and a hydraulic pressure I/O inside.
A shaft 416 is provided with two flow paths 417 for air pressure, and a shaft 416 is rotatably attached to the shaft 416, and the hands 421 and 422 of a workpiece gripping mechanism 420, which will be described later, are connected to a hand opening/closing mechanism 43.
The piston 412 is provided with two hooks 413, and the arm support member 415 is provided with a pinion 414 that meshes with the rack 413.

The work gripping mechanism 420Vi, two nozzles A1
It is comprised of gripping claws 423 and 424 provided at the end of the winding of the A-ri-L-L-hala 1-F A9111')9. Gripping claw 4
23 and 424 are formed in a U-shape and are arranged to face each other to grip the workpiece wt.

The hand opening/closing mechanism 430 includes the two hands 421
, 422 correspondingly connected pistons 431, 432
and a cylinder 433 fixed to the arm support member 415 to which the base ends of the pistons 431 and 432 are mounted,
434, and the piston 431.4
32 are provided with racks 435 and 436 facing each other, and a one-onion 437 is provided between these racks 435 and 436.

In addition, the cylinders 433 and 434 are attached to the shaft 416.
Correspondingly, a groove 418 is provided to maintain communication between the flow path 417 and these cylinders 433 and 434 even when the node support member 415 rotates.

Further, the turning radius of the workpiece gripping mechanism 420 in this embodiment is set so that the distance between the center of the workpiece to be gripped and the center of the shaft 416 is approximately 1/2 of the pitch of the nozzle 120.

Next, the operation of this embodiment configured as described above will be explained with reference to the above figures.

First, as shown in FIGS. 1 and 2, the conveyor 100 is moved and the workpiece feeder 600 is activated to begin supplying the workpieces.

When a workpiece is supplied, the workpiece mounting device 200 uses three claws 211 to hold the workpiece at a stepped portion corresponding to the outer diameter of the workpiece. When the nosolet 120 comes downward, a control device (not shown) supplies hydraulic pressure (straddle air pressure) to the cylinder 221, and the piston 222 is pushed down, causing the press piece 223 to press the workpiece. Therefore, the workpiece resists the elasticity of the claws 214 and the claws 21
1. Push it all the way open, pass through the opening 240, and insert the nozzle 120.
It reaches the top and is placed on it. After this, winter melon 211,
It is urged by the nose 214 to return to the original horizontal state and hold the next workpiece.

By repeating this, the workpieces are sequentially placed on the conveyor 100 by the nozzles 120 at regular intervals.

When the pallet 120 on which the work is placed comes to a predetermined position due to the movement of the conveyor 100, the work transfer device 300 operates from the standby state to the work receiving @9 state. That is, hydraulic pressure (or air pressure) is applied to port a of cylinder 323 and port d of cylinder 313.

In addition, all explanations below μ refer to hydraulic pressure. ), the cylinder 313 first moves toward the proximal end of the piston 312. Next, the rack 324 is lowered by the lowering of the piston 322, the pinion 325 is rotated, and the swing arm 330 is rotated accordingly. And arm 3
30 is a 90 degree rotation slide, work W on pallet 120
This is the position where the gripping claws 333 and 334 pinch. At this time, it is assumed that hydraulic pressure is applied to the port e of the cylinder J'' 342 (Fig. 7), and the gripping claws 333 and 334 are in an open state.

Then, when the pressure at port e of cylinder 342 is reduced and hydraulic pressure is applied to port f to push piston 341e to the right in FIG. The hand 332 approaches through. Therefore, 5 gripping claws 333, 33
4 approach each other and come into pressure contact with the circumferential side of the workpiece W to grip it.

After this, repair cylinder 31 to port b of cylinder 323.
Apply hydraulic pressure to port c of 3. As a result, piston 3
Pressure is applied to the piston 22 and the cylinder 313 at the same time, but the cylinder 313 is prevented from moving because the cam 7 lower 314 provided at the tip of the piston 312 is now engaged with the side surface of the piston 322. Therefore, first, only the piston 322 rises, causing the swing arm 330 to rotate counterclockwise. When the swing arm 330 reaches the vertical position, the engagement groove 326 provided in the piston 322 engages with the cam follower 314, and the cylinder 313 becomes movable. The cylinder 313 is connected to the rotating arm 33.
0 Extrude in the direction away from the entire contour 100. FIG. 6 shows this state.

At this time, the swinging device 720 swings the arm 722 so that the gripping portion 724 is on standby at the receiving position for the workpiece W. Therefore, the rotating arm 33 due to the cylinder 313
0 protrusion, the workpiece W is securely attached to the gripping portion 724 by the VC.

The work transfer device 300 has finished transferring the work.

Fully apply hydraulic pressure to port d of cylinder 313, swing arm 3
30'Jt Vertical 11 Con 4 A 9 (Retreats to the mouth.

When the base end of the cylinder 313 is detected by the detector 350, the workpiece transfer device is held in the 11 standby state by a locking mechanism (for example, using an all-dart block center of a hydraulic switching valve) (not shown). be done. Note that at this time, the piston 322 is connected to the cam 7 lower 31
It does not descend because it is locked to 4. That is, it has an intercock mechanism.

On the other hand, the rotating device 720 rotates the arms 721 and 722 counterclockwise (FIG. 8), and first, the gripping portion 723'e
It is positioned in front of the chuck 711 of the headstock 710, and when there is a processed workpiece on the chuck 711, it is held as a receiver. Then, by turning slightly, the gripping part 724 that grips the unprocessed workpiece is positioned in front of the chuck 711, and the workpiece is loaded onto the chuck 711.

Then, the rotation device 720 has an arm 721 . '722 in the clockwise direction in FIG.
Position it in front of 00.

Next, hydraulic pressure is applied to the port C of the cylinder 313 of the work transfer device 300 to cause the swing arm 330 to project forward from the standby position and receive the processed work from the gripping section 723. Then, hydraulic pressure is applied to the bow a of the cylinder 323 and the port d of the cylinder 313. Here, as described above, the engagement groove 326 and the cam follower 314 are engaged and interlocked, and the piston 322 does not descend.

First, the cylinder 313 is moved backward. Si1 Nonda 3
13 is completely retracted, the cam follower 314 is disengaged from the engagement groove 326, so the piston 322 descends. As a result, the action of rack 324 and pinion 325 causes pivot arm 330 to rotate 90 degrees clockwise.

In this state, when the port eVc oil pressure of the cylinder 342 is applied, the hands 331 and 332 move away,
The gripping claws 333 and 334 are separated from the workpiece, and the workpiece is
(Nozore) 120.

This nozzle 120 was in an empty state after the above-mentioned unprocessed work was transferred to the work transfer device 300. Therefore, during this time, the conveyor is stationary.

After returning the processed workpiece to the noglet 1201C, the workpiece delivery device 300 enters the standby state as described above when the fifth step 120 arrives. And next A let 1
When 20 comes, the above operation is repeated.

On the other hand, the workpiece returned to the noglet 120 is completely conveyed on the conveyor 100 and reaches the reversing device 400 position.

Here, in the reversing device 400 which was in the neutral state, hydraulic pressure is applied to the port of the cylinder 411, and the pinion 414 is moved as the rack 413 provided on the piston 412 moves.
rotates, and the hand support member 415 rotates around the shaft 416.
rotates to position the work gripping mechanism 420 so as to grip the work on the millet 120 on the front end side of the conveyor 120. Note that in this state, the gripping claws 423.42
4 is assumed to be open.

Then, the hydraulic pressure of the cylinder 433 is released, and
When hydraulic pressure is applied to cylinder 434, hands 422 and 42
1, rank 436, binion 437 and rack 4
35t, and the gripping claws 423 and 424 grip the workpiece.

-After this, apply hydraulic pressure to port h of cylinder 411,
When the rack 413 is moved, the hand support member 415 rotates due to the rotation of the binion 414, and the workpiece gripping mechanism 4
20 rotates 180 degrees.

Then, when the hydraulic pressure of the cylinder 434 is released and the hydraulic pressure is applied to the cylinder 433, the gripping claws 423 and 424 open, and the gripped workpiece is placed on the pallet 120 in an inverted state. At this time, if the reversal of the reversing device 400 is synchronized with the movement of the conveyor 100, the pallet 120 can be placed on the reversing @.
It will be placed on the grid.

The reversing device 400 returns to the neutral position 2, for example, a state rotated by 90 degrees, and then holds the next noglet.

On the other hand, the reversed workpiece is transferred to the next workpiece delivery device! l!
300, is transferred to the headstock 710 in exactly the same manner as described above, and after processing is returned to the controller 47100.

The above operation example is an example in which both the front and back sides of the workpiece are processed, but when processing only one side of the workpiece, the reversing device 400 is stopped. In this case, if the feed pitch of the conveyor 100 is twice that of the above example,
As shown in FIG. 11, one pallet 120 is connected to the first work transfer device 300-1 and the second
Since the workpieces are fed alternately every other piece, it is possible to process all the workpieces on the two headstocks. In addition, machining can be performed with twice the normal pitch.

In the above embodiment, a chain conveyor equipped with a noglet is used, but a belt conveyor 4a may also be used. In this case, the workpiece may be placed directly on the belt without using a noglet.

Further, in the above embodiment, two workpiece transfer devices are used, but it is also possible to use three devices as shown in FIG. 12, or it may be more than μ.

〔Effect of the invention〕

As explained above, the present invention provides a workpiece transfer device corresponding to a plurality of headstocks, a reversing device between the workpiece transfer devices, and connects them with a series of contactors 4A to keep the workpiece constant. By adopting a configuration that transports at intervals,
Double-sided machining of a workpiece can be performed using a single conveyor, and double-sided machining and heat-face machining can be performed as appropriate without changing the conveyor lay-up. Moreover, in the case of negative-face machining, the feed pitch of the workpiece can be adjusted by changing the feed pitch of the workpiece from the headstock. By multiplying the number of machines, the workpiece can be sent alternately to each headstock for processing.
This has the effect of significantly increasing work efficiency. That is, according to the present invention, it is possible to realize the features of both versatility and exclusive use, which have been difficult in the past, using a single conveying device.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the configuration of an embodiment of the work transfer device of the present invention, Fig. 2 is a plan view thereof, and Figs. 3 and 4 are cross sections of essential parts showing the work placement device used in the above embodiment. 5 is a plan view showing the holding mechanism in the device, FIG. 6 is a sectional view of the workpiece transfer device used in the above embodiment, FIG. 7 is a sectional view of the main part of the transfer device seen from the front, and FIG. The figure is an explanatory diagram showing the relationship between the rotating headstock and the turret.
The figure shows a cross section of the main part of the reversing device used in the above example...
Workpiece mounting device, 21O... Workpiece holding mechanism, 211
... Claw, 220 ... Pressing mechanism, 221 ... Cylinder, 222 ... Piston, 223 ... Pressure contact piece, 30
0...Work delivery device, 310...Horizontal movement mechanism, 312...Piston, 313...Cylinder/, 31
4...Cam follower, 320...Swivel drive M & structure,
a21...Bracket, 322...Piston, 32
3...Cylinder #, 324...Rack, 325...
・Binion, 326... Engagement groove, 330... Swivel arm, 331, 332... Hand, 333, 334.
・Gripping claw, 340 ・Land opening/closing mechanism, 341・
...Piston, 342...Cylinder, 343,346
... Rank, 344 ... Binion, 400 ... Reversing device, 410 ... Rotating mechanism, 41100. Cylinder, 412... Piston, 413... Rack, 414
...Binion, 415...Hand support member, -42
0... Work gripping mechanism, 421.422... No. 1 r, 423, 424... Gripping claw, 430... Rod opening/closing mechanism, 431, 4.32... Piston, 433
,434...Cylinder, 435,436...Rank, 437...-binion, 500...Shooter, 60
0... Work feeder, 700... Bed, 710
... Headstock, 711 ... Chuck, 720 ... Swivel device, 721,722 ... Arm, 723.724
...Gripper, 730--Saddle, 740...Turret

Claims (1)

[Claims] A workpiece conveyor that is arranged at regular intervals and carries processed workpieces in sequence or at a pitch of twice or more;
Provided along the workpiece conveyor in sequence or two
At least two conveyors arranged in accordance with double or more pitch conveyance are installed corresponding to the upper headstock and each of the above headstocks, and carry unprocessed workpieces and processed workpieces between the conveyor and the headstock. A workpiece transfer device for transferring and receiving, and at least two
It is arranged between the workpiece delivery devices arranged on the table μ,
It consists of a reversing device for reversing the workpiece on the workpiece conveyor, and when front and back processing is performed, the workpiece is conveyed sequentially on the workpiece conveyor and the workpiece is reversed by the reversing device, and when machining is performed, the workpiece conveyor is rotated twice. Workpiece conveyance device 9 characterized in that the workpiece is conveyed at a pitch of twice or more and the workpiece is conveyed without using a reversing device.