JP2543832Y2 - Front table in bending machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front table in a bending machine which carries a plate-like work on a pass line and positions the bending machine with respect to a bending line using a side gauge and a pin gauge.

[0002]

2. Description of the Related Art Conventionally, when positioning a plate-shaped work with respect to a bending line on a front table of a bending machine, a plurality of reference materials arranged in the front-rear direction on one of the left and right sides first. The side rollers are guided by the LM guide, and are supported by the feed-side screw and feed nut so as to be rotatable around the axis perpendicular to the reference-side stretch provided movably in the left-right direction. It was used to determine the direction.

In order to position the workpiece in the left-right direction by pressing the workpiece against the reference side roller of the side gauge, a plurality of pusher rollers arranged in the front-rear direction on the other side of the side gauge are guided by the LM guide, and A pusher which is rotatably supported around a vertical axis has been used for a pusher-side stretch provided movably in the left-right direction by a feed screw and a feed nut or a cylinder.

In order to position the work in the front-rear direction, the end of the work is once projected from the bending line of the bending machine by an appropriate dimension, and then is movable to the front side of the work in the front-rear direction, and is positioned above and below the pass line. This has been performed by projecting a pin gauge provided so as to be freely retractable, and returning the work in a direction opposite to the conveying direction to abut the pin gauge.

[0005]

By the way, according to the prior art described above, when positioning the work in the left-right direction, the left and right sides of the work are not parallel or the length of the work in the front-rear direction is short, so that the work cannot be determined. If the work is not located on the axis of the feed screw on a flat surface because it is offset to the rear of the row of side rollers or pusher rollers (closer to the bending machine), rattling due to the gap between the LM guide and the feed screw When,
Due to the bending of the reference-side stretch and the pusher-side stretch, the side gauge, that is, the row of the reference-side rollers may be slanted, or the contact side of the work may not contact the row of the reference-side rollers evenly. .

[0006] In this case, since the side gauge does not perform a sufficient function, there arises a problem that the bent position of the product becomes unstable and inaccurate.

In order to position the work in the front-rear direction, when the work is moved in the back-and-forth direction and is brought into contact with the pin gauge, the rows of the reference side rollers and the pusher rollers are arranged in parallel for the above-described reason. If it is not possible to maintain the frontward concave state, a phenomenon occurs in which the work being reversed is caught by the roller in front of which it is about to come into contact. In this case, since the front end of the work cannot contact the pin gauge, there is a problem that positioning in the front-rear direction becomes impossible.

The object of the present invention is to improve the above-mentioned problems without disturbing the position of the reference roller of the side gauge.
Another object of the present invention is to provide a front table in a bending machine that does not make it impossible to position a work in the front-rear direction.

[0009]

According to the present invention, a plate-like work is carried into a pass line.
A front table in a bending machine that performs positioning with respect to a bending line of the bending machine, and is arranged in the front-rear direction on either one of the left and right sides of the front table as a reference,
And a plurality of reference-side rollers rotatably supported around a vertical axis, and a reference-side stretch provided movably in the left-right direction with respect to the frame of the front table by supporting these reference-side rollers. Side gauge
A plurality of pusher rollers arranged in the front-rear direction for pressing and positioning the work in opposition to the side gauge and a vertical axis via an elastic body which constantly urges the pusher rollers in the side gauge direction. A pusher comprising a pusher-side stretch supported rotatably around the frame and movably in the left-right direction with respect to the frame; and a retractable and movable back-and-forth for positioning the work in the front-rear direction. And a simple pin gauge.

In addition, an appropriate number of the plurality of pusher rollers are grouped into an appropriate number, and a plurality of pusher rollers are supported for each of the groups and provided to be movable in the left-right direction with respect to the pusher-side stretch. With a configuration including a slide member, or a roller cylinder is provided on an appropriate pusher roller among the plurality of pusher rollers, and is provided so as to be individually movable in the side gauge direction with respect to the pusher-side stretch. The pusher-side stretch is provided so as to be slightly movable in the left-right direction with respect to the frame.

[0011]

By using the front table in the bending machine of the present invention, the reference-side stretch is first moved to adjust the left-right position of the plurality of reference roller rows slightly apart according to the work width. . Simultaneously, the pusher-side stretch is also moved, and the pusher roller row is adjusted to a position sufficiently wider than the work width with respect to the plurality of reference roller rows.

Next, the work is carried in on the pass line of the front table and reaches the side gauge area, is conveyed along the row of reference side rollers, and the rear end is bent at the bending line of the bending machine. Is stopped when it has gone too far by an appropriate distance.

In order to ensure the positioning of the workpiece in the left-right direction, the reference-side stretch is first moved to push the workpiece toward the center for accurate positioning, and then the pusher-side stretch is moved in the direction of the side gauge. . And the subsequent operation can be divided into two ways.

One of them is that, after the pusher roller is stopped slightly before the work, only the slide member that supports the pusher roller in the region from the rear end to the front end of the work is used.
When the pusher roller is moved to the side gauge side and pressed against the side of the work, the work is flatly contacted with the side gauge by a weak force of the elastic body.

The other is stopped when the urging force of the elastic body is slightly increased after the row of pusher rollers comes into contact with the work. Then, the work is pressed completely flat against the reference roller by the weak urging force of the elastic body. Then, after the row of pusher rollers has been returned slightly away from the work, only the roller cylinder in the area from the rear end to the front end of the work is operated, so that the work can be performed only with the pusher roller related to this roller cylinder. It is pressed via the elastic body in the direction of the reference roller.

In any of the above operations, the work is pressed against the reference roller by the weak urging force of the elastic body, so that the side gauge is bent and does not deviate from the original position.
The work is reliably positioned in the left-right direction.

Next, even when the workpiece is fed backward and the front side is brought into contact with the protruding pin gauge to perform positioning in the front-rear direction, the pusher roller is caught by the front end of the workpiece during the backward feeding, and There is no loss of contact with

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

First, regarding the first embodiment, FIGS.
In FIG. 1, the front table 1 is disposed in front of the bending machine 3 (to the left in FIGS. 1 and 2), and passes a plate-shaped work W carried in from the front through a pass line P on a roller conveyor 5. Along with the bending machine 3, and also serves to position the work W with respect to the bending line B of the bending machine 3.

That is, of the frames 7 of the front table 1 assembled on the floor, the left and right upper frames 7
a and 7b are arranged in the front-rear direction, respectively, and rotatably support both ends of a roller shaft 9a of a plurality of pipe rollers 9 extending in the left-right direction.

The foremost one of these pipe rollers 9 is an exception. A belt is wound from an adjacent pipe roller 9 to transmit power, but the power is transmitted to the roller shaft 9a of the other plurality of pipe rollers 9. Sprockets 1 on each outer end
1 is attached.

These sprockets 11 are engaged with left and right separate chains 13a and 13b. The left and right chains 13a and 13b are wound endlessly including a plurality of idlers 15 provided at appropriate locations and a driving sprocket 15a at the forefront end.

The left and right driving sprockets 15a are
The drive shaft 17 is connected to a drive motor 21 fixed to the frame 7 via a sprocket and a chain 19.

Incidentally, as an exception, a permanent magnet roller 23 is incorporated inside the second left and right pipe rollers 9 from the rear end. The roller conveyor 5 is made up of the components indicated by the reference numerals 7a to 23.

With the above configuration, when the drive motor 21 is rotated forward, power is transmitted to the chain 19, the drive shaft 17, the drive sprocket 15a, and the idler 15, so that the left and right chains 13a, 13b start rotating simultaneously. Then, the pipe roller 9 is rotated in the forward direction from the sprocket 11 engaged with these via the roller shaft 9a.

At this time, when the work W is placed on the roller conveyor 5, the work W is transported forward on the pass line P from the near side to the rear bending machine 3 direction. When the drive motor 21 is rotated in the reverse direction, the pipe roller 9 is simultaneously rotated in the reverse direction, so that the work W is moved backward from the rear to the front.

As will be described later, when positioning the work W in the front-rear direction, the work W may be reversed by rotating the pipe roller 9 in the vicinity of the bending machine 3 in this case. And the pipe roller 9 tend to cause slippage and damage each other. However, as described above, the permanent magnet roller 23 is incorporated inside the second left and right pipe rollers 9 from the rear end. Therefore, the slip phenomenon with the work W is prevented, and the work W does not touch each other.

Next, the side gauge 25 will be described with reference to FIGS. First, the intermediate frame 27 of the frame 7
An LM guide (linear motion guide) 33 is provided on two rails 31 extending in the left-right direction on the right half of the horizontal frame 29 provided on the upper rear side.
Are slidably guided in the left and right direction,
A reference-side stretch 35 is fixed on the LM guides 33.

At the left end of the reference-side stretch 35, a plurality (eight in this embodiment) of reference-side rollers 37 pivotally supported on a vertical axis are arranged in the front-rear direction. 2 is provided at a position protruding above a pass line P on the roller conveyor 5 as shown in FIG.

On the other hand, a feed nut 39 is fixed to the center of the lower surface of the reference-side stretch 35, and a feed screw 41 extending in the left-right direction is engaged. This feed screw 41
Are rotatably supported at both ends by bearings provided on the horizontal frame 29.

On the other hand, the right end of the feed screw 41 has a pulley 43
As shown in FIG. 2, a timing belt 47 is wound between the pulley 43 and the pulley attached to the drive shaft of the servomotor 45 suspended from the horizontal frame 29. Have been.

With the above configuration, the servo motor 45
When controlled and driven by the device, the movement is controlled by the timing belt 47, pulley 43, feed screw 41, feed nut 39.
Is transmitted to the reference-side stretch 35 via the.

Then, since the reference-side stretch 35 moves in the left-right direction while being guided by the LM guide 33 and the rail 31, the row of the reference-side rollers 37 is stopped at a desired position. Therefore, accurate positioning as the side gauge 25 is performed.

Next, a pusher 49 for pressing the work W against the side gauge 25 to perform positioning.
Will be described with reference to FIGS. 1, 2, 3 and 4.

First, LM guides 53 are slidably guided in the left-right direction on two rails 51 extended in the left-right direction on the left half on the horizontal frame 29. The pusher-side stretch 55 is fixed on the LM guides 53.

At the right end of the pusher-side stretch 55, an appropriate number (2 in this embodiment)
) Is provided with a slide member 57 that is movable in the left-right direction, and is driven by a cylinder 59 supported by the pusher-side stretch 55.

As shown in FIG. 3, an appropriate number (two in this embodiment) of holder cases 61 are arranged and fixed in the front-rear direction at the tip of the slide member 57.

A roller holder 63 is slidably provided in the holder case 61 in the left-right direction.
The spring (elastic body) 65 is always biased rightward (leftward in FIG. 3). At the end of the roller holder 63, a pusher roller 67 rotatably supported on a vertical axis is provided. The upper end of the pusher roller 67 is provided at a position protruding above the pass line P of the roller conveyor 5 similarly to the reference roller 37.

A proximity sensor 69 is provided on the L-shaped bracket fixed to the tip of the holder case 61 so as to hang down. A proximity sensor 71 is attached to the top end of the cover of the holder case 61 above the spring 65.

On the other hand, a feed nut 73 is fixed to the center of the lower surface of the pusher-side stretch 55, and a feed screw 75 extended in the left-right direction is engaged. Both ends of the feed screw 75 are rotatably supported by bearings provided on the horizontal frame 29.

A pulley 77 is provided at the left end of the other feed screw 75.
A timing belt 81 is wound between the pulley 77 and a pulley attached to a drive shaft of a gear motor 79 with a brake that is attached to the horizontal frame 29 by hanging.

With the above configuration, when the gear motor 79 is rotated, the movement is controlled by the timing belt 81 and the pulley 7.
7. The feed is transmitted to the pusher-side stretch 55 via the feed nut 75 and the feed nut 73.

Then, the pusher-side stretch 55 is LM
Since the guides 53 and the rails 51 move in the left-right direction guided by the rails 51, the row of the pusher rollers 67 can be suddenly stopped at a desired position.

Further, the operation of the cylinder 59 attached to the vicinity of the right end of the pusher-side stretch 55 and the parts on the slide member 57 will be described later in the operation of positioning the work W. I just mention that there is.

Next, referring to FIG.
A device for operating a pin gauge 83 for positioning the work W in the front-rear direction is incorporated in the gap between the positions a and 7b.

Referring to FIGS. 1 and 2, a feed screw 89 rotatably supported by bearings 87a and 87b attached to the front and rear ends of a base 85 supported and fixed on the intermediate frame 27 extends in the front and rear direction. It is provided.

A slider 93 including a feed nut 91 engaged with the feed screw 89 is slidably provided in the front-rear direction while being guided by the base 85. The slider 9
A cylinder 95 and a columnar bracket supporting a pin gauge 97 are vertically provided on the top of the arm 3, and furthermore, an arm 9 pivotally supported by the hinge pin 97 and extending forward.
The front end of the pin 9 is provided with the pin gauge 83 fixed vertically. The tip of the piston rod of the cylinder 95 and the arm 99 are connected via a link.

On the other hand, a pulley 101 is attached to the front end of the feed screw 89, and a timing belt 105 is wound around a pulley attached to a drive shaft of a servo motor 103 fixed to a base 85. ing.

With the above configuration, the servo motor 103
When controlled and driven by the C device, the movement is transmitted to the timing belt 105, the pulley 101, the feed screw 89, and the feed nut 91, and the slider 93 can be accurately positioned at a desired longitudinal position. When the cylinder 95 is extended, the arm 99 is swung upward about the hinge pin 97 via the link, so that the pin gauge 83 is vertically upward, and the tip of the pin gauge 83 is projected on the pass line P.

In FIG. 2, reference numeral 107 denotes a lower plate of the bending machine 3, and reference numeral 109 denotes an upper plate which moves up and down. Work W is
Since the bending is performed while being sandwiched between the lower plate 107 and the upper plate 109, the rear ends of these are bending lines B.

Next, the operation in the process of positioning the work W with respect to the bending line B of the bending machine 3 will be described.

First, when the servo motor 45 is driven,
The reference roller 37 is moved rightward (upward in FIG. 1) from the standby position in FIG. (The solid line in FIG. 1 is the standby position and indicates the position where the work W having the minimum width is to be positioned. Further, the two-dot chain line indicates the position where the work W having the maximum width is to be positioned.) The position to be stopped is a position opened slightly to the right (for example, 20 mm) from the reference position with respect to the incoming work W.

The pusher roller 67 is moved simultaneously with the movement of the reference roller side 37. That is, when the gear motor 79 with the brake is driven, the pusher roller 67 is moved leftward (downward in FIG. 1) from the standby position in FIG. (The display by the solid line and the two-dot chain line in FIG. 1 has the same meaning as described for the reference side roller 37 above.)
The stop position is a position opened slightly to the left (for example, 20 mm) from the original holding position for the incoming work W.

Next, when the work W is carried in from the front side of the roller conveyor 5 (left side in FIG. 1), the drive motor 2
Since 1 is rotated in the forward direction, all the pipe rollers 9 are rotated in the forward direction, and the work W is conveyed toward the rear of the front table 1 (to the right in the figure). When the work W reaches the row of the reference rollers 37, the right side of the work W is conveyed along these reference rollers 37,
The work W is stopped when the bending position of the work W slightly exceeds the bending line B of the bending machine 3.

Next, when the servo motor 45 is rotated forward,
The reference-side roller 37 is moved to the left to a reference position determined by the NC device while pressing the right side of the work W.

Next, when the gear motor 79 is rotated forward,
The pusher roller 67 is moved rightward and stopped just before contacting the left side of the work W (for example, 5 mm). This stop position can be detected by a proximity sensor 69 attached to the tip of the holder case 61.

Next, only the grouped pusher rollers 67 within the range from the rear end to the front end of the work W are moved rightward. For this purpose, only the cylinders 59 in the group detected by the proximity sensor 69 below the work W are moved rightward by a distance (for example, 10 mm) to which the spring 65 works properly. This position can be detected by the proximity sensor 71, and the cylinder 59 is adjusted so as to be moved 10 mm in advance by inserting a washer or the like.

Thus, the work W is pressed flat at an appropriate position by a row of the reference side rollers 37 with an appropriate weak force, so that the work W is inclined even if it moves forward in the next stroke. The position in the left and right direction can be accurately maintained. The pusher roller 67 located before the front end of the work W is
Since the work W is retracted slightly (for example, 5 mm as described above) from the left side of the work W, there is no possibility that the pusher roller 67 is caught on the front end of the work W in the next stroke and causes trouble.

Next, when the servo motor 103 is driven,
When the slider 93 is moved via the feed screw 89 and further stopped at the command position of the NC device, the cylinder 95 is raised, and the arm 99 is pushed up with the hinge pin 97 as an axis. Protruding upward. Then, when the drive motor 21 is rotated in the reverse direction, the pipe roller 9 is rotated in the reverse direction and the front end of the work W is
The workpiece W is moved forward and stopped until it comes into contact with the workpiece 3. This completes the positioning of the workpiece W in the front-rear direction.

As described above, when the work W is moved forward from the stopped state, a slip occurs between the work W and the pipe roller 9 and both of them are damaged. In the first embodiment, however, a part of the work W is damaged. Since the permanent magnet roller 23 is incorporated in the pipe roller 9, there is no occurrence of slip, scratch, abrasion and the like.

Next, a second embodiment of the present invention will be described with reference to the drawings. As compared with the first embodiment, the only difference is that the abutment sensor is provided on the side gauge, and the structure and operation method of the pusher are slightly different. The other difference is that there is a side gauge on the left side of the roller conveyor and a pusher on the right side, and a reference side stretch and a pusher side stretch in the left and right direction. Since there are two moving feed screws, parts having the same function will be described with the same reference numerals and the same names.

First, in FIGS. 5, 6, and 7, the front table 1 is disposed in front of the folding machine 3. Left and right upper frames 7a, 7b of the front table 1
Are arranged in the front-rear direction, and rotatably support both ends of a roller shaft 9a of a plurality of pipe rollers 9 extended in the left-right direction. The roller shaft 9 of these pipe rollers 9
The sprockets 11 are respectively mounted on the outer ends of “a”.

These sprockets 11 are engaged with left and right separate chains 13a and 13b. These chains 13a and 13b are wound endlessly including a plurality of idlers 15 and a driving sprocket 15a at the forefront end.

The left and right driving sprockets 15a are
The drive shaft 21 is connected to a sprocket mounted on a shaft of a drive motor 21 mounted on the frame 7 via a sprocket and a chain 19. Then, the reference numeral 7a
To 21 constitute a roller conveyor 5.

When the drive motor 21 is rotated forward by the above configuration, the power is transmitted to the chain 19, the drive shaft 17, the drive sprocket 15a, and the idler 15, so that the left and right chains 13a, 13b start rotating at the same time. And
The pipe roller 9 is rotated in the forward direction from the sprocket 11 engaged with these via the roller shaft 9a.

At this time, if the work W is placed on the roller conveyor 15, the work W is transported forward on the pass line P from the front to the rear. When the drive motor 21 is reversed,
At the same time, since the pipe roller 9 rotates in the reverse direction, the work W is moved backward from the rear to the front.

Next, the side gauge 25 will be described.
First, the horizontal frame 29 provided on the intermediate frame 27
On the upper left half, the LM guides 33 are slidably guided in the left-right direction on the two rails 31 extended in the left-right direction, respectively.
A reference-side stretch 35 is fixed on 3.

At the right end of the reference-side stretch 35, a plurality (14 in the second embodiment) of reference-side rollers 37 supported on a vertical axis are arranged in the front-rear direction. The upper end of 37 is provided at a position protruding above the pass line P on the roller conveyor 5 as shown in FIG.

The last part and the reference roller 3 just before this end
7, a contact sensor 111 with a contact is provided, and projects slightly (for example, 1 mm) from the tip of the tip reference side roller 37 of the contact 113.

The details of the abutting sensor 111 are shown in FIG.
Is fixed, and a butcher 113 is horizontally slidably provided in the center hole of the guide cylinder 117 in the left-right direction. A spring 1 is provided between the abutment 113 and the main body 115.
19 is provided, and always urges the butcher 113 to the right (to the left in FIG. 8).

On the other hand, the tail projection 11 of the
A contact 123 is formed by 3a and a terminal tube 121 adhered and fixed to the tail of the guide tube 117, and is always in an ON state. When the work W comes into contact with the reference roller 37, the contact 123 is turned off.

Next, feed nuts 39 are fixed to the front and rear ends of the lower surface of the reference-side stretch 35, respectively, and feed screws 41 extending in the left-right direction are engaged with each other.
Both ends of the feed screw 41 are rotatably supported by bearings provided on the horizontal frame 29.

Further, pulleys 43 are attached to the left ends of the feed screws 41, respectively. As shown in FIG.
A timing belt 4 including an idler pulley is provided between the pulley 43 and the pulley 43
7 are wound.

With the above configuration, the servo motor 45
When controlled and driven by the device, the movement is controlled by the timing belt 47, pulley 43, feed screw 41, feed nut 39.
Is transmitted to the reference-side stretch 35 via the.

Then, the reference side stretch 35 is guided by the LM guide 33 and the rail 31 and moves in the left-right direction, so that the row of the reference side rollers 37 is stopped at a desired position.

Accordingly, accurate positioning as the side gauge 25 can be performed.

Next, a pusher 49 for pressing the work W against the side gauge 25 to perform positioning.
Will be described with reference to FIGS. 5, 6, 7, and 9. FIG.

First, on the right half on the horizontal frame 29,
The LM guide 53 is slidably guided in the left-right direction on each of the two rails 51 extended in the left-right direction. The pusher-side stretch 55 is fixed on the LM guide 53. I have.

On the left side of the pusher-side stretch 55, a plurality (14 in the second embodiment)
The pusher roller 67 is rotatably supported on a vertical shaft fixed on the plurality of roller holders 125. Further, these roller holders 125 are slidably provided in the pusher-side stretch 55 via a slide member 127 and a spring 65 in the left-right direction.

A cylinder 59 is provided on an appropriate number (two in the second embodiment) of slide members 127 at appropriate positions among the above-mentioned slide members 127, and a cylinder 59 is provided to the left of the other pusher rollers 67. It can be protruded. These details will be additionally described with reference to FIG.

FIG. 9A shows a conventional slide member 127.
FIG. In FIG. 9A, a linear slide 129 is mounted on the pusher-side stretch 55, and a slide bar 131 is slidably supported in the left-right direction. A roller holder 125 supported by a wheel 133 rolling on the pusher-side stretch 55 via a spring 65 is attached to the left side of the slide bar 131. A touch arm 135 is fixed upright to the right end of the slide bar 131, and a head of an adjustment bolt 137 whose length can be adjusted in the left-right direction abuts on the main body of the linear slide 129. Has become.

FIG. 9B is an explanatory view of the periphery of the slide member 127 on which the cylinder 59 is mounted. The structure is such that the slide member 127 without the above-mentioned cylinder 59 is mounted.
Since they are almost the same, only the differences will be described. That is,
A cylinder 59 is horizontally mounted on a bracket provided on the main body of the linear slide 129 with the piston rod facing right, and the tip of the cylinder 59 is brought into contact with the touch arm 135 via a collar 139. ing.

With the above configuration, the spring 65 always urges the pusher roller 67 in the direction of the left reference side roller 37 via the roller holder 125. Therefore, when the work W presses the pusher roller 67, the spring 65 The urging force is a reaction force that pushes the work W back toward the reference roller 37.
Further, when the workpiece W is not in contact with the pusher roller 67, the relative position with respect to the pusher-side stretch 55 is as follows:
This is performed by adjusting the length of the adjustment bolt 137.

However, in the slide member 127 in which the cylinder 59 is mounted, the touch arm 135 is provided at the right end of the slide bar 131 instead of the adjustment bolt 137, being sandwiched between the double nuts 141. The free position of the pusher roller 67 can be adjusted by the nut 141. When the piston rod of the cylinder 59 is retracted, the pusher roller 67 is protruded leftward by the urging force of the spring 65, and the amount of protrusion (for example, 10 mm) is equal to the length of the collar 139 or several sheets instead. Can be adjusted by replacing washers. In the second embodiment, the cylinder 59 is always in the extended state,
The position of the pusher roller 67 is aligned with the position of the pusher roller 67 mounted on the slide member 127 without the cylinder 59.

Now, at the lower right end of the pusher-side stretch 55, a main body of two short strokes (for example, 5 mm) of air cylinders 143 is attached to the front and rear with the piston rod facing left (see FIG. 7). The tip of the piston rod is connected to the nut member 145. A feed nut 73 is fixed below the nut member 145, and is engaged with and supported by a feed screw 75 extending in the left-right direction. Both ends of the feed screw 75 are rotatably supported by bearings provided at the front and rear ends of the horizontal frame 29.

On the other hand, a pulley 77 is attached to the right end of each of the two feed screws 75, and a pulley 77 is mounted between the pulley 77 attached to the drive shaft of the servomotor 147 hanging down from the horizontal frame. A timing belt 81 is wound around an appropriate number of idle pulleys provided at appropriate positions. (See FIG. 7) With the above configuration, when the servo motor 147 is rotated, its movement is controlled by the timing belt 81, the pulley 77, and the feed screw 7.
5, Pusher-side stretch 55 via feed nut 73
Is transmitted to

Then, the pusher-side stretch 55
Since it moves in the left-right direction while being guided by the M guide 53 and the rail 51, the row of the pusher rollers 67 can be moved to a desired position and then stopped.

Further, although the air cylinder 143 is constantly contracted, when the air cylinder 143 is extended,
The pusher-side stretch 55 and the pusher roller 67 loaded thereon move rightward by a small dimension (for example, 5 mm). That is, it is retracted by a small dimension with respect to the reference roller 37.

Next, referring to FIG.
A device for operating a pin gauge 83 for positioning the workpiece W in the front-rear direction is incorporated in the gap between a and 7b. However, since this device is completely the same as that of the first embodiment, only the pin gauge 83 is used here. Is positioned in the front-rear direction by a feed screw 89 rotated by the servomotor 103, and is moved up and down on the pass line P by vertical movement of the cylinder 95, and detailed description is omitted.

In FIGS. 5 and 6, the work W is bent by being sandwiched between the lower plate 107 of the bending machine 3 and the upper plate 109 which moves up and down.

Next, the operation in the process of positioning the work W with respect to the bending line B of the bending machine 3 will be described.

When the servo motor 45 is driven first, the reference roller 37 moves leftward from the standby position in FIG.
(The solid line in FIG. 5 is the standby position, and indicates the position where the work W having the minimum width is to be positioned. The two-dot chain line indicates the position where the work W having the maximum width is to be positioned.) What is stopped is the incoming work W
Is a position slightly opened (for example, 20 mm) to the left of the reference position with respect to.

The pusher roller 67 is also moved simultaneously with the movement of the reference roller 37. That is, the servo motor 14
7 is driven, the pusher roller 67 is moved rightward from the standby position in FIG. The stop position is a position opened slightly to the right (for example, 20 mm) from the original holding position for the incoming work W.

Next, when the work W is carried in from the near side of the roller conveyor 5, the drive motor 21 is rotated in the forward direction, so that all the pipe rollers 9 are rotated in the forward direction, and the work W is Transported toward the rear of Then, when the work W reaches the row of the reference side rollers 37, the left side of the work W is conveyed along these reference side rollers 37, and the bending position of the work W is set at the bending line B of the bending machine 3. Stopped just over a little.

Next, when the servo motor 45 is rotated forward,
The reference roller 37 is moved rightward to a reference position determined by the NC device while pressing the left side of the work W.

Then, when the servo motor 147 is rotated forward, the pusher roller 67 is moved leftward and stopped when it comes into contact with the right side of the work W. This contact is
It is sensed when the contact 123 of the butting sensor 111 is opened. In addition, the right side of the work W is lightly pressed toward the reference side roller 37 by the urging force of the spring 65 pressing each pusher roller 67 due to this contact. Here, the positioning of the work W in the left-right direction is determined.

Next, when the air cylinder 143 is extended,
The pusher-side stretch goes to the right by a small dimension (for example, 5 mm). That is, the work W is retracted with respect to the right side. Then, when one or two of the two cylinders 59 are contracted according to the length of the work W input in advance, that is, only the cylinder 59 behind the front end of the work W is contracted. Then, the pusher roller 67 there is protruded to the left, that is, toward the right side of the work W by the urging force of the spring 65 via the roller holder 125. The amount of protrusion is 10 mm because the collar 139 functions as a stopper if there is no work W. However, when the pusher roller 67 moves a little (for example, 5 mm), it comes into contact with the right side of the work W. The right side of the work W is pressed with an appropriate force by the urging force. Then, even if the work W is moved forward in the next stroke, the position in the left-right direction is secured.

When the work W is moved forward in the next step, the pusher roller 67 located before the front side of the work W is moved forward.
Is retracted by 5 mm from the right side of the work W, so that there is no inconvenience that the front side is caught and positioning in the front-rear direction becomes impossible.

Next, when the servo motor 103 is driven,
The feed screw 89 rotates to position the pin gauge 83 in the front-rear direction. When the cylinder 95 is raised, the tip of the pin gauge 83 is projected above the pass line P.

When the driving motor 21 is rotated in the reverse direction, the pipe roller 9 rotates in the reverse direction, and the work W is moved forward. The work W is stopped when the front end of the work W comes into contact with the pin gauge 83. This completes the positioning of the workpiece W in the front-rear direction.

Then, the upper plate 109 of the bending machine 3 is lowered, and the work W is held between the lower plate 107 and the bending machine B at the bending line B.

Next, FIG. 10 shows an example of a folding machine 149 for performing double ironing, in which a C table 151 and a D table 153 having the same structure as the above-mentioned front table 1 are provided to the front and rear, offset to the left and right. Have been.

Since the bending machine 149 has a lower plate and an upper plate in front and back, the bending lines are in front and back of B ₁ and B ₂ . Work W
It is being carried from the front of the folding machine 149 in bending line B ₁ bending ironing the rear of the workpiece W is performed. Then, the sheet is conveyed backward through the folding machine 149 as it is. Furthermore, those which are bent at bend line B ₂ ironing the front of the workpiece W is performed.

When the work W is carried into the C table 151, the positioning in the left, right, front and rear directions is performed as described for the front table 1. At this time, the side gauge 25 pushes the work W to the right by 20 mm to set the reference position in order to surely set the position in the left-right direction. The bending line B ₁ first folding is performed.

[0105] Next ironing bending to perform, the work W is made the longitudinal direction of the positioning, the ironing bending as bent at bend lines B ₁ of the second are performed.

Then, the work W
Is passed through the bending machine 149 and the rear D table 153
Will be transported to Therefore, the D table 153 is provided offset by 20 mm to the right of the C table 151.

Next, the workpiece W is pushed 20 mm to the right by the side gauge 25 on the D table 153 and positioned in the left-right direction, and then positioned in the front-rear direction. The bending line B ₂ third bending is performed. Next, work W
After positioning in the front-back direction for ironing bending,
Bending line B ₂ in ironing bending as the fourth bending is performed.

FIG. 11 shows a bending machine 149 and a C table 15.
1 is a flowchart relating to the D table 153. Since the operation of the front table 1 has been described in detail above, the operation will be briefly described here.

First, when the ram for moving the bending die reaches the rising end when the bending is completed in step S1, D in step S2.
Since the processed work W that has been on the table 153 is carried back, the completion of the carry-out is confirmed. In the next step S3, the work W, which has been bent by the C table 151, is unloaded through the folding machine 149 and is loaded into the D table 153, so that the removal from the C table is confirmed. .

Then, in step S4, a new work W is carried into the C table 151.

Next, while the work process from step S5 to step S12 is performed in the C table 151, the work process from step S13 to S20 is performed in the D table 153 at the same time.

On the other hand, in the C table 151, the pusher is turned on in step S5 to approach the side gauge 25 side, and at the same time, in step S6, the side gauge 25 also hits the work W and pushes it to the 20 mm pusher 49 side. Thereby, the workpiece W is positioned in the left-right direction. Then, by reversing the roller conveyor 5 in step S7, the work W moves forward and comes into contact with the pin gauge 83, thereby completing the positioning in the front-rear direction.

[0113] Next, the rear portion of the workpiece W is bent by the bending line B ₁ folding machine 149 in step S8. In step S9, the workpiece W is positioned again in the front-rear direction by the pin gauge 83 in order to perform the ironing bending.

[0114] Next, ironing bending Te at is performed in the rear of the workpiece W to the bend line B ₁ in step S10. Then, in step S11, the ironing bending die in the bending machine 149 is released, and in step S12, the ram that moves up and down the bending die is raised. Then, the process is repeated when the bending of step S1 is completed.

In the other D table 153, the same steps as those performed in the C table 151 are performed in steps S13 to S20. Therefore, although the description is omitted, the differences are the bending in step S16 and the step S18.
The ironing bending is performed on the front part of the work W, the pin gauge positioning in step S15, and the step S17.
Is performed by sending the workpiece W backward. That is, since the D table 153 is located at the rear of the bending machine 149, the movement of the workpiece W in the front-rear direction is opposite to that of the C table 151.

The present invention is not limited to the above-described embodiment, but can be implemented in other modes by making appropriate changes.

For example, in the first embodiment, if the gear motor 79 for moving the pusher-side stretch 55 is replaced with a servomotor, the stop position can be commanded, so that the proximity sensor 69 becomes unnecessary. Further, if the size of the work W is preliminarily input and automatically selected, which of the appropriate number of cylinders 59 to operate can be programmed, so that the proximity sensor 69 becomes unnecessary from this point as well.

[0118]

As will be understood from the above description of the embodiment, since the pusher roller is supported by the pusher-side stretch via the elastic body urged in the side gauge direction, the work Is pressed flat against the side gauge with an appropriately weak force.

Therefore, since the reference-side stretch and the pusher-side stretch do not bend or are hardly affected by the gap of the feed mechanism in the left-right direction, the side gauge can accurately hold the original reference position.

Further, in order to compensate for the weak pressing force of the pusher roller, the side gauge is operated so as to be slightly pushed back in the pusher direction before the work is pushed by the pusher. Be accurate.

Also, cylinders are provided on an appropriate number of slide members, and the associated pusher rollers can be individually moved in the direction of the work by these cylinders, so that only the pusher rollers behind the front side of the work are moved by the work W.
Is pressed.

Therefore, in order to perform positioning in the front-rear direction,
When the work is moved backward on the front table and brought into contact with the pin gauge, there is no inconvenience that the work is caught by the excessively pushed pusher roller and positioning in the front-rear direction becomes impossible.

[Brief description of the drawings]

FIG. 1 is a plan view of a front table according to a first embodiment of the present invention.

FIG. 2 is a right side view of FIG. 1 and is a partially sectional view for explanation.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a plan view illustrating a work positioning operation.

FIG. 5 is a plan view of a front table according to a second embodiment of the present invention.

FIG. 6 is a right side view in FIG. 5 and is a partially sectional view for explanation.

FIG. 7 is a front view of FIG.

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG.

9A is a sectional view taken along line IXa-IXa in FIG. 1, and FIG. 9B is a sectional view taken along line IXb-IXb in FIG.

FIG. 10 is an explanatory plan view of a double ironing and bending machine provided with front and rear front tables.

FIG. 11 is a flowchart relating to the double ironing and bending machine in FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front table 3 Bending machine 25 Side gauge 35 Reference side stretch 37 Reference side roller 49 Pusher 55 Pusher side stretch 57 Slide member 65 Spring (elastic body) 67 Pusher roller 83 Pin gauge B Bending line P Pass line W Work

Claims (3)

(57) [Scope of request for utility model registration] 1. A plate-like work is carried in on a pass line,
A front table in a bending machine that performs positioning with respect to a bending line of the bending machine, and is disposed in the front-rear direction on one of the left and right sides of the front table as a reference,
And a plurality of reference-side rollers rotatably supported around a vertical axis, and a reference-side stretch provided movably in the left-right direction with respect to the frame of the front table by supporting these reference-side rollers. Side gauge
A plurality of pusher rollers arranged in the front-rear direction for pressing and positioning the work in opposition to the side gage and an elastic body which constantly urges these pusher rollers in the direction of the side gauge are arranged around a vertical axis. A pusher comprising a pusher-side stretch rotatably supported on the frame and movably in the left-right direction with respect to the frame; and a retractable and movable back and forth for positioning the work in the front-rear direction. A front table in the bending machine, comprising: a pin gauge. 2. An appropriate number of said plurality of pusher rollers being grouped into an appropriate number and supporting said pusher rollers for each of said groups and being provided movably in the left-right direction with respect to said pusher-side stretch. The front table according to claim 1, further comprising a slide member. 3. A roller cylinder is provided on an appropriate number of pusher rollers among the plurality of pusher rollers, and is provided so as to be individually movable in the side gauge direction with respect to the pusher-side stretch. The front table according to claim 1, wherein the front table is provided so as to be slightly movable in the left-right direction with respect to the frame.