JPS61235026A - Work feeding device - Google Patents

Abstract

PURPOSE:To increase the feeding accuracy of a work by providing the width deciding mechanism providing a claw member and the originating mechanism and by arranging the carriage and sub-carriage to perform the feeding and take-out of the work. CONSTITUTION:The work feeding device 1 is composed of a front table 2, the mechanism 3 deciding the width of a work, originating mechanism, the carriage 5 and sub-carriage 6 giving the feed with pinching the work W. The width deciding mechanism 3 has the feeding mechanism to move with approaching the same quantity each other in the direction of the work transfer by supporting to claw member. When the work W is carried in on the table 2, the claw member of the width deciding mechanism 3 is moved to perform the width deciding. The originating of the work W is then performed by actuating the carriage 5 and sub-carriage 6. With this method the positioning in the feed direction and width direction of the work W is performed and the feeding accuracy in the work W is increased.

Description

Detailed Description of the Invention 10.Object of the Invention (Field of Industrial Application) The present invention is a method for processing a plate-shaped workpiece (simply referred to as a workpiece in this specification) such as a plate, a blank, or a finished product using a processing machine. It relates to a feeding device that mechanically feeds the machine into a mold etc. attached to the machine and takes it out after processing. To explain in more detail,
The present invention relates to a workpiece feeding device suitable for feeding a workpiece into a bending machine, pushing it in or pulling it out as necessary, or changing the workpiece as needed, and furthermore, taking out the workpiece after the bending process is completed.

(Prior Art) As a device for feeding a workpiece into a bending machine, there is a device disclosed in Japanese Patent Laid-Open No. 168445/1983. As shown in FIG.
The receiver is stopped by a stopper (not shown) on the workpiece loading line whose position is controlled in advance to determine the width, while manually pressing the front edge of the workpiece to the reference position in the feed direction to bring it to the origin. After the workpiece W is clamped by the clamping device 102 of the carriage 101, the carriage 101 body is moved to a predetermined position beforehand.
11105 by moving the hydraulic cylinder 104 forward until it collides with the workpiece W.
The width is determined and the origin is determined only at the beginning of clamping the work W. After that, the work W is moved with the assumption that the clamp position is correct and there is no deviation.
I try to give feed, rotation, etc.

(Problems to be Solved by the Invention) However, with a small-diameter clamping device that clamps the workpiece at one point, it is difficult to prevent the workpiece W from inertial movement during rotation, and it is inevitable that the fixing position will be slightly deviated. especially,
This deviation becomes more noticeable as the workpiece W becomes larger. Moreover, like the conventional workpiece feeding device described above, once the workpiece W is clamped, it is not released until the bending process on all sides is completed and it is taken out, and there is no means for automatically moving the workpiece W. In some cases, the above-mentioned deviations are not corrected but are amplified or synthesized, gradually making them larger and more complex. For this reason, when the above-mentioned workpiece feeding device is used, the bending accuracy is poor.

In addition, if you use the conventional feeding device mentioned above, which does not let go of the workpiece W once it is clamped until all bending is completed, bending of all sides can be performed by simply finding the initial origin and determining the width. In order to do this, the center of the workpiece W must be clamped, and in addition, it is necessary to avoid interference between the clamping device 102 and the gooseneck bending die (105) 106 (for fixing the workpiece W), and to 106 and the tip edge W1 of the bent workpiece W need to have a minimum clearance for protruding the workpiece W to the extent that they do not interfere in the vertical direction, so the minimum bending width is relatively large. There is a drawback.

That is, the minimum bending width of a workpiece that can be used by the bending machine is approximately ((thickness in the feed direction of the gooseneck bending die 106 + radius of the clamping device 102 + workpiece protrusion amount) x 2).

Therefore, it is an object of the present invention to provide a workpiece feeding device that has high feeding accuracy and can provide a predetermined feed to other sides even when clamping any position other than the center of the workpiece. The object of the present invention is to provide a workpiece feeding device that can improve the bending accuracy and make the minimum bending width relatively small when used in a bending gate.

II. Structure of the Invention (Means for Solving the Problems) In order to achieve the above object, the workpiece feeding device of the present invention has a front table on which an imported workpiece is placed, and a front table on which the workpiece is to be fed. A width determining mechanism that aligns the workpiece in the width direction perpendicular to the feed direction using claw members that approach the feed center by the same amount in the direction of the feed center that coincides with the center of the processing machine; It has an origin finding mechanism that protrudes from the front edge of the workpiece and abuts the front edge of the workpiece at at least two points to position the workpiece in the feeding direction, and a clamping means that can hold the workpiece and rotate it horizontally by a predetermined angle at the tip thereof. It consists of a carriage that feeds or takes out a predetermined amount, and a sub-carriage that is mounted on the carriage and moves independently in the same direction as the carriage to eject or pull out the workpiece when not clamped. The feed is applied after the origin search is performed.

(Example) The configuration of the present invention will be described in detail below based on an example shown in the drawings.

FIG. 1 shows a longitudinal sectional view of an embodiment in which the present invention is applied to a work feed device for a bending machine. This workpiece feeding device 1 is
A front table 2 on which the workpiece W to be carried is placed, a width determining mechanism 3 that positions the workpiece W on the table 2 in the width direction, an origin setting mechanism 4 that aligns the feeding start position of the workpiece W, and a workpiece W is held between the front table 2, The folding machine 50 consists of a carriage 5 that moves the workpiece W by a desired amount and a subcarriage 6 that moves the workpiece W in an unclamped state, and is installed in front of the folding machine 50 so as to be perpendicular to the transport line of the workpiece W.

The bending machine 50 in this embodiment includes a blank holder consisting of an upper die 51 that is attached to a ram 53 and moves up and down, and a lower die 5.2 that is fixed to a frame 54 that constitutes the main body of the bending machine 540. , the workpiece held in the holder (
It consists of a rocker arm 56 with a plate 55 disposed at its tip that bends the protruding tip edge W1 of the W (also referred to as a blank) in the vertical direction, and drive actuators 57, 58, and 59 that swing or horizontally move the arm 56. . One of the molds of the blank holder, usually the upper mold 51, is configured as a split mold that can be raised and lowered to allow the workpiece W to be moved in and out, and that the width of the mold can be changed to correspond to the width of the workpiece.

As shown in FIG. 2, the above-mentioned front table 2 has a claw member 11 of the width determining mechanism 3 in the ware conveying direction (in the six directions of the arrows in the upper figure).
A set of strip-shaped tables formed by forming a plurality of passages 7 for moving the carriage 5 and a passage 8 for passing the carriage 5 in the workpiece feeding direction (direction of arrow B in the figure) perpendicular to the workpiece conveyance direction. It is the body. Below the front table 2, magnetic conveyors 9 for carrying in and out of the work W are provided on the left and right sides of the carriage passage 8. The magnetic conveyor 9 replaces the belt of the belt conveyor with a rubber belt containing a magnet or an absorbent belt equipped with a magnet, and it attracts the workpiece W and carries it almost to the center of the front table 2 from any direction. The table 2 is to be carried out. The movement of the conveyor 9 is kept at a constant speed, and after confirming with a limit switch 10 or other sensor that the workpiece W has passed a certain point, the conveyor 9 is stopped after an appropriate time has elapsed based on the input data regarding each workpiece. It is preferable to provide the workpiece W to be stopped at the center of the workpiece. Of course, manual stopping by visual recognition by the operator is also possible.

As shown in FIG. 3, the width determining mechanism 3, which positions the workpiece W carried in approximately at the center of the front table 2 in the width direction (workpiece conveyance direction A), moves the inside of the passage 7 of the front table 2 in the workpiece conveyance direction. It consists of a claw member 11 that moves in the direction A, and a feed mechanism 12 that supports the claw member 11 and moves the claw member 11 toward each other by the same amount in the workpiece conveyance direction A around the carriage path 8 at the center of the table. Here, the feeding mechanism 12 includes the claw member 11
a sliding table 13 on which the slide table 13 is placed, a threaded rod 14 with opposite threads of the same pitch cut on the left and right sides, a nut 15 connecting the threaded rod 14 and the sliding table 13, and the threaded rod 14, and a guide rod 17 that supports the slide table 13, and provides the same amount of feed to the claw member 11 on the slide table 13 in the opposite direction centering on the carriage passage 8. . In addition, the above-mentioned feed screws 14 and 15 are NG.
It is preferable to use a ball screw suitable for sub-control.

The claw member 11 is provided on the sliding table 13 so as to be swingable in the workpiece conveyance direction A with a pivot shaft 18 .

This claw member 11 is located inside the carriage passage 8.
The outer surface 11a of the part that can be rotated to the side and projects above the front table 2 is an inclined surface, so that no matter which direction the work W is carried in, it tilts inward and sinks under the front table 2. It is provided so that the work W passes over it.

Normally, this claw member 11 has a weight portion 1 that protrudes rearward.
1b protrudes above the front table 2,
In addition, since it cannot rotate outward and functions as a stopper, if a workpiece W exists between them, it can be held and aligned with the center of the table. The sliding table 13 and the nut 15 mentioned above are connected via a spring 19, and when a resistance of more than a certain value occurs in the claw member 11, the spring 19 is compressed to prevent the swinging of the claw member 11. It is provided so as to substantially stop and prevent the workpiece W from deforming or the like. As a result, the width determining mechanism 3 drives the ball screw 14 so that the claw member 11 has a predetermined width based on the data regarding each workpiece W that has been input in advance. Even if 11 is about to be narrowed, this can be avoided by compression of spring 19. In this case, excessive movement of the nut 15 is detected by the limit switch 20 and is avoided by immediately stopping the drive motor 16.

The origin finding mechanism 4 arbitrarily protrudes onto the feeding surface of the work W, that is, the front table 2, and connects at least two points to the front edge of the work W.
They come into contact at a point to align the feed start position of the workpiece. In the case of this embodiment, the originating pins 21 are arranged evenly in a direction perpendicular to the feeding direction centering on the carriage passage 8, and are provided so as to selectively protrude as appropriate in accordance with the width dimension of the workpiece W to be fed. There is. In this embodiment, the originating pins 21 are moved in and out individually by cylinder actuators 22.

The originating pin 21 of this embodiment is configured to conduct electricity between the left and right originating pins 21 to electrically detect whether or not the workpiece W is in contact with both pins 21. Although the stopper for stopping the work W and the sensor for detecting the presence of the work W are provided, a separate sensor for detecting the presence of the work W may be provided. Alternatively, two movable bins 21 may be provided and moved by the same amount left and right in response to changes in the width of the workpiece.

The carriage 5 is equipped at its tip with a clamping means 23 capable of holding the workpiece W and rotating it by a predetermined angle in a horizontal plane, and moves across the front table 2 to give a predetermined feed to the clamped workpiece W. be. The carriage 5 is placed on a guide rail (not shown) of a bed 24, and is movable in the workpiece feeding direction B by a feed screw 25. The feed screw 25 is usually NG.
A ball screw suitable for a servo mechanism or the like is used to feed the workpiece W by a predetermined amount by moving the entire carriage 5. The rotation of the feed screw 25 is controlled by a drive motor, for example a DC control motor 26.

The clamping means 23 consists of a pair of rotatable clamp plates 26U and 26D that clamp the workpiece W from above and below.On the other hand, the upper clamping plate 26U is normally movable up and down to arbitrarily hold the workpiece W carried onto the front table 2. It is designed so that it can be held in place. The upper clamp plate (hereinafter referred to as upper clamp plate) 26U is rotatably attached to a holder 28 that can move up and down along a guide rail 27 at the front end of the carriage 5. The holder 28 supporting the upper clamp plate 26U is moved up and down by driving a built-in cylindrical actuator or rotating a ball screw. Further, the lower clamp plate (hereinafter referred to as the lower clamp plate) 26D is rotatably supported by a bracket 29 fixed to the front end of the carriage 5, and a rotation drive mechanism and an indexing mechanism are attached to the rotation shaft 30. It is provided so that it can be rotated and stopped at a desired angle.

The rotational driving means applies a predetermined amount of rotation to the lower clamp plate 26D in order to change the direction of the workpiece W, and in this embodiment, a cylinder type actuator (not shown) is used using a rack 31 and a pinion gear 32. (omitted) is converted into rotation of a shaft 33 within the carriage, which is further transmitted to the lower clamp plate 26D via a pair of bevel gears 34. Since the rotation given to the clamping means 23 may be in any direction, 18
A rotation within Q° is sufficient. For this reason, the cylinder type actuator rotates the rotation axis 3o at 18Q° or 90'
It is preferable to use a chair that has at least a stroke sufficient for rotation.

Further, the indexing mechanism is used to ensure that the rotation of the clamping means 23 is stopped at a predetermined angle. It consists of an indexing disc 35 and an indexing pin 37 which engages with a notch 36 on the periphery of this disc 35, and which is optionally protruded by a cylindrical actuator 38. The stopping position of clamp 26D can be determined.

Further, the carriage 5 is equipped with a sub gear ledge 6. This sub-gear 6 moves in the same direction as the carriage 5, that is, in the feeding direction, to give movement to the workpiece W when it is not clamped, and is driven by its own feeding mechanism. A block 39 at the tip of the sub-gear ledge 6 that comes into contact with the workpiece W serves as an electromagnetic chuck, and is provided so as to attract the workpiece W and pull it out 1q as required. The block 39 is attached to the bracket 4 on the base 40.
The sliding rod 42 is attached to the tip of the sliding rod 42 supported by the workpiece W, and is provided so as to come into contact with the rear end edge of the workpiece W and move rearward when receiving pressure from the workpiece W. A compression coil spring 43 is interposed between the block 39 and the bracket 41, and only when the block 39 is constantly urged forward and receives a reaction force on the workpiece side that resists the spring force of the spring 43. It is designed to move backwards. This retreat of the block 39 is effective in preventing deformation of the workpiece W, but becomes more difficult as the spring 43 is compressed. Therefore, on the movement trajectory of the sliding rod 42, the movement of the rod 42 is detected and the drive motor 4 is
4 is provided with a limit switch 45 for stopping the operation.

(Function) When using the workpiece feeding device configured as described above, the workpiece can be fed accurately and the bending operation can be carried out with high precision.

As shown in the flowchart of FIG. 4, when the workpiece W is carried onto the front table 2, the limit switch 10 confirms that it has passed a predetermined position, and the workpiece W is stopped at approximately the center of the table 2. At this time, the carriage 5 is arranged in advance so that the clamping means 23 is located approximately at the center of the workpiece W based on the input data regarding the workpiece W to be carried in. Therefore, the claw member 11 of the width determining mechanism 3 located outside the workpiece W is moved inward to determine the width of the workpiece W, that is, to perform alignment in the direction perpendicular to the workpiece feeding direction B.

Next, the origin is determined with or without rotating the workpiece W as required. Normally, the workpiece W is conveyed in the longitudinal direction and bent from the longitudinal edge, that is, from the short side, so the workpiece W is rotated by 90 degrees and processing begins. Note that when the workpiece W is rotated when finding the origin, at least the width is determined again. Then, using the sub-carriage 6, the workpiece W is sent toward the origin setting pin 21 side, and the front edge of the workpiece is pressed against at least two origination pins 21, so that the feeding start position of the workpiece W is aligned. The so-called origin search is performed. At this time, the width of the workpiece W has already been determined, so positioning has been completed in both the feed direction and the width direction, and the workpiece can be accurately positioned in the bending @50 mold by simply feeding it a predetermined amount. obtain.

Therefore, the clamping means 23 of the carriage 5 is closed to clamp the workpiece W. Then, the workpiece W is fed in a predetermined amount based on the data entered in advance. Furthermore, work W
If the width or length of the workpiece W is narrow and the center of the workpiece cannot be clamped, for example, if the center of the workpiece is clamped, the upper die 51 of the bending machine 50 and the holder 28 of the clamp 23 will interfere with each other. Hold the rear of the bag and send it.

The workpiece W is bent by lowering the upper mold 51 of the bending machine 50 to fix the workpiece W, and by swinging a rocker arm 57 having a blade 56 at its tip.

After the bending process, the upper mold 51 is inched up and the workpiece W is
Release from restraint state. After that, when performing the so-called secondary bending process in which the tip edge of the bent workpiece is further bent in the opposite direction or humming bent, the workpiece is ejected by a predetermined amount again and the above-mentioned operation (workpiece fixation → bending process) is performed. Repeat. When secondary bending is not performed, the work W is unclamped and the sub-carriage 6 is driven to push the work W forward to prevent interference with the gooseneck bending upper die 51. Then, the upper die 51 is raised to handle the die.

Next, the workpiece W is pulled out to the rear while being sucked by the subcarriage 6, and at the same time, the entire gear ledge 5 is also moved back, and the workpiece W is pulled out to a position where it can be rotated. If all the bending processes have been completed, the front table 2
It is carried out by a magnetic conveyor 9. On the other hand, when the other side is to be bent subsequently, the workpiece W is clamped again, rotated by a predetermined angle, the width is determined again, the origin is determined, and the workpiece W is fed by a predetermined amount to the bending position @50. Even if the workpiece W whose direction has been changed is strongly fixed by the clamping means 23, it may shift due to inertia force and cannot be accurately positioned. However, the width of the workpiece W is determined and the origin is determined after each bending process. , are placed with their leading edges aligned on the machine centerline. Therefore, positional deviations caused by the rotation of the workpiece W and their accumulation can be prevented, and highly accurate feeding is possible.

In addition, the operation of the drive motor 16, 26, 44, cylinder type actuator 22, 38, etc. is controlled by, for example, NC control or CN control.
This type of work can be fully automated when performed using C control.

IIl. Effects of the Invention As is clear from the above explanation, the workpiece feeding device of the present invention has a front table on which an imported workpiece is placed, and a feeding center that is twice the center of the processing machine into which the workpiece is to be fed. a width determining mechanism that performs centering in the width direction perpendicular to the feeding direction of the workpiece using claw members that approach each other in the same direction; an origin finding mechanism that abuts and positions the workpiece in the feeding direction; a carriage that has a clamping means at its tip that can clamp the workpiece and rotate it by a predetermined angle in a horizontal plane, and feeds or takes out the workpiece by a predetermined amount; It consists of a sub-carriage that moves independently in the same direction as the carriage mounted on the carriage to eject or pull out the workpiece when not clamped, and determines the width of the workpiece and returns to its origin for each side bending process. Since feed can be applied, deviations in the fixed position caused by inertial movement during rotation of the workpiece are corrected for each feed, and high feed accuracy can be ensured.

Therefore, when used in a bending machine, the bending accuracy can be improved.

In addition, this workpiece feeding device determines the width of the workpiece and finds the origin for each bending process on one side so that the feeding start position can be aligned, so there is no need to clamp the center of the workpiece, and the workpiece can be moved if necessary. It is also possible to clamp the ends. Therefore, when used in a bending machine, the minimum size of a workpiece that can be used with the workpiece feeding device of the present invention is (thickness in the feeding direction of the gooseneck bending die + diameter of the clamp plate + amount of workpiece protrusion) in the bent state. Therefore, the thickness of the gooseneck bending die in the feed direction plus the amount of workpiece protrusion can be made smaller than the conventional one.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment in which the present invention is applied to a workpiece feeding device for folding bars, Fig. 2 is a plan view of the front table portion, and Fig. 3 is an example of the original drawing of the width determining mechanism. It is a front view. 1... Workpiece feeding device, 2... Front table, 3...
...Width determining mechanism, 4... Origin finding mechanism, 5... Carriage, 6... Sub-carriage, 9... Magnetic conveyor, 11... Claw member, 23... Clamping means, A...・Workpiece conveyance direction, B...Workpiece feed direction,
W... Work.

Claims (1)

[Claims] A front table on which the carried-in workpiece is placed and a claw member that approaches each other by the same amount toward the feed center that coincides with the center of the processing machine into which the workpiece is to be fed, are used to move the workpiece in the width direction perpendicular to the feeding direction of the workpiece. a width determining mechanism that performs centering; a home positioning mechanism that protrudes arbitrarily above the workpiece feeding surface and contacts the front edge of the workpiece at at least two points to position the workpiece in the feeding direction; A carriage that has a clamping means at its tip that can be rotated by a predetermined angle and feeds or takes out a workpiece by a predetermined amount, and a sub-carriage that moves independently in the same direction as the carriage mounted on the carriage to eject or pull out the workpiece when not clamped. A workpiece feeding device characterized by determining the width of the workpiece and determining the origin for each bending process of one side, and then feeding the workpiece.