JPS5915783B2 - Workpiece conveyance device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention transports an unprocessed workpiece from a loading station to a processing station, processes the workpiece using a machine tool, and transports the processed workpiece from the processing station to a processing station. The present invention relates to a workpiece conveyance device for conveying workpieces to.

Conventionally, the above-mentioned workpiece conveyance devices have been designed to sequentially and simultaneously convey workpieces from a carry-in station to a machining station and from this machining station to a conveyance station by advancing a transfer bar.
Commonly used.

However, the conventional method requires a pitch between each station that is considerably larger than the thickness of the workpiece, which increases the installation space and the stroke of the cylinder that operates the transfer bar. There was a problem in that the workpiece that was expected to be produced was created.

This invention solves the above-mentioned problems and can reduce the pitch interval of each loading, processing, and unloading station, and also reduces the stroke of the transfer cylinder that operates the transfer bar, thereby creating a compact workpiece transfer device. In addition, it is an object of the present invention to control the movement in and out of a plurality of stoppers in conjunction with the loading and unloading operations of the transfer bar, thereby ensuring the positioning of workpieces at machining and loading stations, etc. It is.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In Fig. 1, 1 is a carry-in station, 2 is a processing station, and 3 is a carry-out station.These stations 1, 2. It is located.

A jig base 10 is disposed in the machining station 2, and the jig base 10 has front and rear walls 11 and 12 projecting upward, and is installed on the base (not shown) of the machine tool. There is.

As shown in FIGS. 1 to 3, the loading station 1 has a pair of left and right front 1. The rear frames 5, 6, 7.8 are installed;
Side plates 36 are installed horizontally between them, and these front and rear frames 5, 6, 7.8 are fixed to the rear wall 12 of the jig base 10.

Upper and lower guide bars 13 and 14 are installed horizontally between the one front and rear frames 5 and 7, and these guide bars 1
3.14 is arranged between the upper and lower beams 9,9.

A carrier 15 is fitted and supported on the guide bars 13, 14 so as to be slidable in the front and rear directions.

A transfer cylinder 16 is horizontally fixed between the front and rear walls 11 and 12 of the jig base 10.
The tip of the piston rod 17 is fixed to a portion of the carrier 15 between the upper and lower guide bars 13 and 14.

A guide rail 19 that makes sliding contact with one side of the workpiece 4 is fixed to the upper beam 9 provided between the front and rear frames 5 and 7 on one side via a bracket 18, and A guide rail 21 that slidably supports the lower surface of the workpiece 4 is fixed to the provided side plate 36 via a bracket 20, and an inclined surface 36 at the upper part of the side plate 36
A guide rail 22 that slidably supports the other side of the workpiece 4 is also fixed to a.

The guide rails 19, 21, 22 are connected to the front and rear frames 5.
, 6 and 7, 8 horizontally in the front-rear direction.

A base end of a transfer bar 23 is fixed to the transport body 15, and the transfer bar 23 extends horizontally forward, and a first transport claw 24 is attached to the base and a second transport claw 25 is attached to the tip. .

1st. Since the configurations of the second transport claws 24 and 25 and the attachment structure to the transfer bar 23 are the same, one of the transport claws 24 will be described with reference to FIG. 6.

A bent portion of a conveyance claw 24 having a cross-section shaped like a square is pivoted to be rotatable in a vertical plane direction by a pivot pin 26 in a through hole 23 a formed in the transfer bar 23 . J
3. At the tip protruding from a, there is a workpiece 4 in an approximately triangular shape.
A retaining portion 24a is formed.

Further, a spring 27 is positioned and interposed between the base 24b of the conveyance claw 24 and the end upper wall portion 23b of the through hole 23a, and the conveyance claw 24 moves the pivot pin 26 by the spring force of the spring 27. The center is biased clockwise in FIG. 6.

Anti-rotation protrusion 2 protruding above the base 24b of the conveyance claw 24
An inclined surface 24d is formed at the rear of the 4c, and this inclined surface 24
d is the upper wall portion 23bK of the through hole 23a; the inclined contact surface 23;
c is formed.

The conveyance claw 24 is restrained from rotating clockwise when it is engaged with the workpiece 4 as shown by the solid line in FIG. 6 due to the contact between the inclined surface 24d and the contact surface 23e. Claw 24
The spring 2γ is compressed so that the spring 2γ can be rotated counterclockwise.

A support flock 28 is disposed close to the rear of the front frames 5, 6, and a pair of left and right support rollers 29, 29 whose axial directions are inclined outward are pivotally supported on the support block 28. A transfer bar 23 is supported on top.

A transfer bar pedestal 30 is disposed at a suitable location on the jig base 10, and the transfer bar 2 is mounted on this pedestal 30.
3 is configured to be supported when it moves forward.

Note that the support block 28 and the transfer bar pedestal 30 are fixed to the fixed member side by appropriate means (not shown).

As shown in FIGS. 1 to 5, a pivot 31 is installed between the side plate 36 and the bracket 20 fixed thereto, and a stopper link 32 is attached to the pivot 31 so as to be swingable in the vertical direction. The link 32 is located on one side of the transfer bar 24 (7) and extends in the front-rear direction.
A first stopper 33 for positioning the workpiece 4 at the carry-in station 1 is provided at the front end, and a second stopper 34 for preventing the workpiece 4 from being carried into the carry-in station 1 is provided at the upper rear end. , 1st. Second stopper 33
．． 34 are configured such that when one protrudes from the workpiece transport path, the other one retracts, the first stopper 33 being slightly forward of the rear wall 22 of the jig base 10, and the second stopper 34 being located slightly forward of the rear frame 7.8. They are each placed slightly in front of the

Further, the stopper link 32 is always given a rotational moment in the counterclockwise direction in FIGS. 1 and 4 due to its own weight, and the first cam 35 is fixed to the rear end side, and the upper surface of the first cam 35 is A cam surface 35a is formed on the cam surface 35a, which extends forward parallel to the lower surface of the stopper link 32 and has a rearwardly downwardly inclined portion.
A follower roller 37 is pivotally supported by the carrier 15, and the cam surface 35a is supported by the follower roller 37.

A stopper plate 38 is attached to a side wall plate 40 fixed to the front and rear walls 11 and 12 of the jig base 10 so as to be able to swing vertically with a pivot 58, and the workpiece 4 is mounted on the upper front end of the stopper plate 38. A third stopper 39 for positioning the jig base 2 is provided, and the third stopper 39 is disposed slightly behind the front wall 11 of the jig base 10.

The operating means for the stopper plate 38 is constructed as follows.

An operating shaft 41 extends horizontally from the lower part of the front wall 11 to the rear frame 8. An engaging dog 42 is provided at the front end of the operating shaft 41, and an engaging dog 42 is provided on one side of the stopper plate 38. The interlocking element 43 is configured to be removably engaged.

A connecting pin 44 is rotatably supported by passing through the side plate 36, and an operating link 45 is provided at the inner end of the connecting pin 44.
However, a control link 46 is fixed to each outer end.

A second cam 47 is fixed to the carrier 15, and the second cam 47
A cam surface 47a is formed on the lower surface of 7, and has portions that are inclined so that both ends are located upwards before and after the central horizontal portion.
The arcuate upper surface of the operating link 45 is brought into contact with this cam surface 47a.

A pair of front and rear support blocks 48 are fixed to the side plate 36, and a fixed shaft 49 is installed on these blocks 48.
A post-adjustment nut 50.50 is screw-fitted, a slider 51 is slidably fitted to the center of the fixed shaft 49, and a spring 5 is fitted between the slider 51 and the adjustment nut 50.50.
2.52 is interposed between the slider 51 and the operating link 4.
5 are engaged.

The operating link 45 is normally held at a neutral position by the spring force of the springs 52, 52 (see FIG. 5).

A threaded portion 41a is formed at the rear end of the operating shaft 41,
Front and rear dogs 53, 53 are screwed into the threaded portion 41a, and the lower end of the control link 46 is connected to the dog 5 of the operating shaft 41.
3.53 and are abutably engaged with these.

The control link 46 is normally in contact with the rear dog 53, and is configured such that there is a predetermined amount of clearance from the front dog 53 (see FIG. 1).

A confirmation rod 54 is protruded in front of the conveyor 15, and a dog 55 is provided on the confirmation rod 54, and this dog 55 is connected to the limit switch 5 for confirming the stop position on the way back.
6 (see FIG. 4).

Note that a stopper bolt 57 of the stopper link 32 is fixed to the bracket 20 provided on the side plate 36 so as to be vertically adjustable.

Next, the operation of the workpiece conveying device configured as described above will be explained with reference to FIGS. 7a to 7e.

The conveying body 15 and transfer bar 23 shown in FIG. Third stopper 34
．． 39 is immersed, first, as shown in Figure 1a,
The workpiece 4 is slid on the guide rails 19, 21, 22 from the carry-out station of the machine tool in the previous process to the carry-in station 1, where the front end of the workpiece 4 comes into contact with the first stopper 33, either manually by an operator or by a conveyor. and transport it.

In this state, the first transfer claw 24 of the transfer bar 23
is located in front of the second stopper 34 and behind the workpiece 4,
A gap 1 is formed between the workpiece 4 and the workpiece 4, and the second conveyance claw 25 is located below the workpiece 4 and is lowered by the load thereof.

In this state, when the transfer cylinder 16 is operated to shorten the piston rod 17, the carrier 15 and the transfer bar 23 move forward together.

While the transfer bar 23 moves forward by the gap 1,
The follower roller 37 provided on the conveyor 15 is the first cam 35
The stopper link 32 rotates under its own weight, causing the first stopper 33 to retract from the conveyance path of the workpiece 4, and the second stopper 34 to protrude into the conveyance path.

Therefore, as the transfer bar 23 moves forward, the workpiece 4 is pushed by the first conveyance claw 24 and sent toward the loading station 1 and the processing station 2, and the second stopper 34 protrudes from the workpiece 4, causing the workpiece 4 to be pushed by the first conveyance claw 24 and sent to the processing station 2 due to the protrusion of the second stopper 34. The workpiece is prevented from being sent to the loading station 1.

During the forward movement of the transport body 15 and transfer bar 23 described above, the operating link 45 is rotated counterclockwise in FIG. 5 by the cam surface 47a of the second cam 47, and in conjunction with this, the control link 46 is rotated. and dog 5 on the right side of Figure 1.
3 is pressed to the right, the operating shaft 41 retreats to the right and the engagement dog 42 of the operating shaft 41 engages the stopper plate 38.
is rotated clockwise in FIG. 1 to be engaged with the retainer 43, and the third stopper 39 projects into the transport path of the workpiece 4,
When the piston rod 17 is shortened by the full stroke So,
As shown in FIG. 7, the front end of the workpiece 4 pushed forward by the first conveying claw 24 of the transfer bar 23 comes into contact with the third stopper 39 projected as described above and stops. It is transported to a predetermined position in the processing station 2.

In this case, the workpiece is supported on a suitable member of the machine tool (not shown).

In addition, in the above-mentioned operation, when the second cam 47 passes, the operating link 45 returns to the neutral position by the spring force of the springs 52 and 52, and the control link 46 also returns to the state before operation. Due to the gap between the link 46 and the dog 53 on the left side of the operating shaft 41 in FIG.
does not return and remains in the retracted state, and therefore, the third stopper 39 also remains in the protruding state.

Next, the workpiece 4 is positioned on a machine tool, clamped, and processed as desired.

During this processing, when the piston rod 17- is extended by reversely operating the transfer cylinder 16, the carrier 15 and the transfer bar 23 are moved backward.

When the dog 55 of the confirmation rod 54 provided on the carrier 15 comes into contact with the limit switch 56 for confirming the stop position during the retreat, the piston rod 17 is moved as shown in FIG. 7C.
is the full stroke S.

The stroke is extended by a shorter stroke So-ΔS and stopped in the middle.

As a result, the second transfer claw 2 provided on the transfer bar 23
5 is positioned slightly rearward from the rear end of the workpiece 4 and protrudes.

Moreover, the workpiece 4 is located on the recessed first stopper 33.

When the carrier 2575'-X is retreated to the intermediate stop position, the second cam 47 rotates the operating link 45 and the control link 46 clockwise, as shown by the two-dot chain line in FIG. moves forward, and the engagement dog 42 provided thereon moves forward.
Note that the engagement between the engagement element 43 and the stopper plate 3 is released.
The third stopper 39 is rotated counterclockwise in FIG. 1 by the weight of 875, and the third stopper 39 is retracted from the conveying path to allow the workpiece 4 to be unloaded.

After the machining of the workpiece 4 is completed, the clamp of the workpiece 4 is released and the transfer cylinder 16 is operated again to shorten the piston rod 1γ by the stroke S1, so that the transfer bar 23 moves forward together with the carrier 15, The workpiece 4 is pushed by the second conveyance claw 25 provided thereon, and the workpiece 4 is transferred to the unloading station 3 as shown in FIG. 7d.
transported to.

Thereafter, the transfer cylinder 16 is reversely operated to extend the piston rod 17 through its entire stroke So, thereby causing the carrier 15 and the transfer bar 23 to retreat back to their original positions.

During this backward return, the cam surface 35a of the first cam 35 is supported by the follower roller 37 provided on the conveyor 15, so that
The stopper link 32 rotates, and as shown in FIG. 7e, the first stopper 33 projects into the transport path of the workpiece 4, and the second stopper 34 is retracted, returning to the original position.
It allows the next workpiece 4 from the previous process to be loaded into the loading station 1.

Further, the processed workpiece 4 transported to the unloading station 3 is transported to a machine tool for the next process by appropriate means.

As described above, in the workpiece transfer device of this embodiment, one transfer bar 23 is provided with the first and second transfer claws 24 and 25, and the first transfer claw 24 on the base side of the transfer bar 23 is used to carry out processing from the carry-in station 1. The workpiece 4 is transported to the processing station 2, and the second transport claw 25 at the tip of the transfer bar is used to transport the workpiece 4 from the processing station 2 to the unloading station 3. After that, the transfer bar 23 is moved back and then moved forward again to convey the machined workpiece 4 to the unloading station 3, so that the stroke of the transfer cylinder 16 can be made small, and a compact conveying device can be provided. Not only is this possible, but its configuration is also relatively simple.

Also, between loading station 1 and processing station 2,
Entrance of loading station 1 and processing station 2
and the unloading station 3, the first, second and third
Coupled with the fact that the stoppers 33, 34 and 39 are installed so as to protrude and be recessed into the transport path of the workpiece 4 in connection with the transfer operation, the pitch between the three stations 1 and 2.3 described above can be reduced. In the above embodiment, the distance between the centers of each station 1, 2.3 in the longitudinal direction can be made shorter than the length of the workpiece 4 in the longitudinal direction;
Space can be used effectively.

Furthermore, since workpieces cannot be placed at adjacent stations at the same time, there is also the advantage that workpieces that are wasted time can be eliminated.

In this embodiment, the stopper provided at the entrance of the carry-in station 1 can be used from the initial point in time when the workpiece 4 is conveyed from the carry-in station 1 to the processing station 2.
Canada IF - Projects into the conveyance path of the work section 4 until the final stage of conveying the workpiece from John 2 to the unloading station 3 to prevent malfunction of the next workpiece being conveyed to the unloading station 1. It also has the advantage that reliable and stable operation can be expected.

In addition, in this invention, the first. Second. The structure for operating the third stopper does not necessarily have to be the same as in the above-described embodiments, and may be operated by, for example, an appropriate actuator using electrical means.

As explained above, the present invention provides a transfer bar with first and second transport claws, moves the transfer bar forward with a transfer cylinder, and transports a workpiece from a carry-in station to a processing station with the first transport claw,
When the transfer bar moves forward again after retracting, the second conveyance claw transports the workpiece from the processing station to the unloading station. ,
The second stopper at the entrance of the loading station and the third stopper between the machining and unloading stations are protruded and recessed into the IJ with respect to the conveyance path of the workpiece, and the workpiece is loaded into the processing station, and the workpiece is positioned at the processing station. Since the workpiece is prevented from being carried into the carry-in station, the station can be made compact by reducing the pitch interval regardless of the size of the workpiece, and even if there is only one transfer cylinder, its stroke can be reduced. The present invention has the advantage that it is possible to provide a workpiece conveying device that can be made small, has a simple structure, and can operate reliably.

In addition, the second invention provides first and second stoppers at the front and rear end portions of a stopper link pivotally connected to a fixed member, and engages the stopper link with the conveying body via a first cam, The stopper link is oscillated via the first cam by the forward movement of the transfer bar until the first conveyance claw contacts the workpiece at the carry-in station, and the first stopper is immersed in the conveyance path of the workpiece; The operating means of the stopper plate, which protrudes the second stopper and is provided with the third stopper A, is engaged with the conveyor via the second cam, and the transfer bar moves forward to convey the workpiece to the machining station. The third stopper is made to protrude from the conveyance path, and when the transfer bar is retracted halfway, the third stopper is recessed into the conveyance path, and this is maintained until the transfer bar advances again, making it easier to work at the processing and loading station. It is possible to position the workpiece reliably, and to perform stable protrusion and retraction operations of each part, and also to transport the next workpiece to the loading station, which may interfere with the transport operation of the workpiece. This has the effect of reliably preventing

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a partially cutaway side view, FIG. 2 is a side view taken in the direction of the ■ arrow in FIG. Figure 4 is a cross-sectional view along the
A cross-sectional view taken along the line IV-IV in the figure, Figure 5 is the ■-
FIG. 6 is a cross-sectional view taken along the line Vl--VI in FIG. 3, and FIGS. 7 a to 7 e are schematic diagrams for explaining the operation shown in the order of operation. 1...-Carry-in station, 2...Processing station, 3...Carry-out station, 4...
...Workpiece, 15...Carrier, 16...
...Transfer cylinder, 17...Piston rod, 23...Transfer bar, 24
, 25...first and second conveyance claws, 32...
・Stopper link, 33.34...1st, 2nd
Stopper, 35... 1st cam, 37...
・Follow roller, 39...Stopper plate, 39
...Third stopper, 41...Operating axis,
42... Engagement dog, 43... Engagement element, 44... Connection pin, 45... Operation link, 46... Control link ,47...
Second cam, 49...Fixed shaft, 50...
Adjustment nut, 51...Slider, 52...
...Spring, 53...Dog, 54...
...Confirmation rod, 55...Dog, 56...
song limit switch.

Claims (1)

[Claims] 1. A carry-in station, a processing station, and a carry-out station are provided consecutively in the conveyance direction of the workpiece at an interval shorter than the size of the workpiece, and the base side is connected to a transfer bar that is moved back and forth by a transfer cylinder. A first conveying claw and a second conveying and feeding claw on the tip side are provided, and when the transfer bar moves forward, the workpiece is transported from the loading station to the processing station by the first carrying claw, and again after the transfer bar retreats. The workpiece is configured to be transported from the processing station to the unloading station by the second transporting claw when moving forward, and between the loading station and the processing station, the entrance of the loading station, and between the processing station and the unloading station. In between, a first stopper for positioning the workpiece at the carry-in station, a second stopper for preventing the workpiece from being carried into the carry-in station, and a third stopper for positioning the workpiece at the processing station are connected to the workpiece transport path. 1. A workpiece conveyance device, characterized in that it is provided with a stopper actuating means that is arranged to be removable and removable, and for individually moving the stoppers in and out in relation to the forward and backward movement of the transfer bar. 2. A loading station, a processing station, and an unloading station are provided consecutively in the conveying direction of the workpieces at intervals shorter than the interval between the workpieces, and a transfer bar is fixed to a gripping general conveying body that is moved back and forth by a transfer cylinder. The transfer bar has a first transfer claw on the base side and a second transfer claw on the distal side.
A conveyance claw is provided, and first, second and third stoppers are provided so as to be able to move in and out of the workpiece conveyance path, between the loading station and the processing station, and between the entrance of the loading station and the processing station. A means is provided between each station and the workpiece is conveyed from the carry-in station to the processing station by the first conveyance claw when the transfer bar moves forward, and then the transfer bar is moved backward by a stroke shorter than the forward stroke and then stopped. , and when the transfer bar moves forward again after intermediate retraction, the second
The workpiece is transported from the processing station to the transport station by means of transport claws, and the first and second stopper links are provided at the front and rear ends of a stopper link pivotally connected to a fixed member so as to be swingable. A second stopper is provided, the stopper link is engaged with the transport body via the first cam, and the transfer bar is moved forward until the first transport claw contacts the workpiece at the loading station via the first cam. The first stopper is recessed into the conveyance path, and the second stopper is made to protrude.Furthermore, the operation means of the stopper plate provided with the third stopper is engaged with the conveyance body via the second cam, and the workpiece is moved. The third stopper is made to protrude from the conveyance path by advancing the transfer bar for conveyance to the processing station, and the third stopper is retracted from the conveyance path by intermediate retraction of the transfer bar, which is then re-advanced. A workpiece conveying device characterized in that it maintains up to