JP2506359Y2 - Work transfer device - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a work (press product) between two press machines.
The present invention relates to a device for transporting a workpiece, and particularly to a transport device for inverting and transporting a work by 180 °.

(Prior Art) Conventionally, as a transfer device of this type, a reversing machine for reversing a work is provided, and the reversing machine is installed in the middle of a transfer conveyor that connects two press machines, and one of the presses is pressed by the conveyor. It is often used that the work conveyed from the machine is transferred to a reversing machine to be reversed, and after reversing, the work is returned to the conveyor and conveyed to the other pressing machine (for example, the actual machine). 58-134233 publication). By the way, in such a transfer apparatus, the work is generally transferred between the press machine and the transfer conveyor by a ceiling-mounted unloader or loader because the transfer speed is high. In this case, in order to avoid interference between the unloader and loader and the work being reversed, the reversing machine must be installed sufficiently away from the press machine, and as a result, the existing press machine with a small press-to-press distance can be installed. There was a problem that it became difficult to apply.

Therefore, for example, in Japanese Utility Model Laid-Open No. 61-92430, a carriage for conveying a work is provided with an unloader jaw that takes out the work from one of the press machines, and the work grasped by the unloader jaw is pulled out while sliding on a guide roller. , A transfer device for transferring this to a reversing machine is described. According to such a transfer device, since the obstacle is removed from above, it is possible to install the reversing machine close to the press machine, which is also sufficient for reversing transfer between presses having a small mutual distance. Will be able to deal with.

(Problems to be solved by the invention) However, according to the transfer device including the unloader jaw, when an attempt is made to increase the drawing speed of the work by the unloader jaw, the work is bounced on the guide roller and the work is distorted. There is a problem in that it is likely to occur and the work transfer speed cannot be increased as desired.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a ceiling-mounted unloader even when a workpiece is approached and turned over.
An object of the present invention is to provide a work transfer device which can avoid interference with a loader, can secure a desired transfer speed, and can be effectively applied to reverse transfer between presses having a small mutual distance.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a ceiling-mounted unloader that takes out a work from one press machine, and a pair of left and right reversing machines that receive and reverse the work from the unloader.
Each of the reversing machines is hung and supported, and it comprises a transfer means for moving the two reversing machines between the two pressing machines, and a ceiling-mounted loader that receives a work from the reversing machine and transfers the work to the other pressing machine. A support arm that swivels in a vertical plane parallel to the work transfer line and a clamp arm that grips the work, and the clamp arm has a grip center offset from the swivel center of the support arm to the support arm. It is characterized by being attached.

(Operation) In the work transfer device configured as described above, since the gripping center of the clamp arm is offset from the turning center, after the center of the work is held by the clamp arm, the gripping center is moved from the turning axis. When the support arm is pivoted so as to be on the lower side, the reversal loci at both ends of the work become large downward and small upward. That is, because the work reversal locus becomes smaller on the upper side, interference with the ceiling-mounted unloader and loader can be avoided even when the work is reversed by approaching the press machine.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 to 4, 1 is a press machine in the previous step, 2 is
Is a press machine in a post process, and a work transfer device 3 according to the present invention is arranged between the press machines 1 and 2. This work transfer device 3 includes a transfer device 4 (only one of which is shown here) arranged to extend in the direction of both presses 1, a reversing device 5 suspended and held by this transfer device 4, and a front device. The unloader roller 6 is arranged in the vicinity of the press machine 1 in the process, and the loader 7 is arranged in the vicinity of the press machine 2 in the subsequent process. Each of the gantry 8 and the unloader 6 and the loader 7 which constitute the transfer device 4 is fixed to the columns, 9, 9 ... Extending from the press machines 1 and 2, and the work transfer device 3
Is constructed as a ceiling-mounted type as a whole. The transfer devices 4 are provided in a pair on the left and right, and the reversing machine 5 is provided for each of the pair of transfer devices.

The frame 8 of the transfer device 4 is formed from a hollow member to have a U-shaped cross section (FIG. 2), and a pair of rails 10 are fixed to both sides of the lower surface of the frame 8. Pulleys 11, 11 are attached to both ends of the gantry 8, and an endless toothed belt 12 is stretched over both pulleys 11. The toothed belt 12 is
The lower side is disposed between the pair of rails 10 and the upper side is disposed in the U-shaped recess of the gantry 8. A motor 13 is mounted on the frame 8.
The drive pulley 14 and a pair of idle pulleys 15 driven by are arranged side by side, and the toothed belt 12 is also wound around these drive pulley 14 and idle pulley 15. That is, the toothed belt 12 is adapted to travel counterclockwise or clockwise as the drive pulley 14 is rotated by the operation of the motor 13.

The rail 10 has a carriage 16 that constitutes the reversing machine 5.
Is suspended and supported so that it can travel. The carriage 16 has a carriage base, as best shown in FIGS. 2 and 3.
17, a hollow plate-shaped carriage body 18 integrally extending downward from the carriage base 17, and a rail 19 attached to a bracket 19 provided on the carriage base 17.
And a group of wheels 20 engaged with the. In the wheel group 20, the pair of wheels arranged at the front / rear and left / right positions of the carriage 16 sandwiches the rail 10 from above and below, whereby the carriage 16 runs stably along the rail 10. . By the way, this Carrage 16 is Carriage Base 17
The toothed belt is provided by a connecting plate 21 arranged above
12 connected. The connecting plate 21 has a tooth portion 21a capable of meshing with the toothed belt 12 on its lower surface (Fig. 4), and is attached to the tip of a bolt 22 extending through the carriage base 17 from below to above. I am The connecting plate 21 is tightly meshed with the toothed belt 12 by tightening the bolt 22, so that the carriage 16 is pulled by the toothed belt 12 and freely travels along the rail 10.

As shown in FIG. 2, the gear body 23 of the carriage 16 and the reversing shaft 24 rotate in different positions in the vertical direction and extend parallel to the traveling direction of the carriage 16 at right angles. It is installed freely. The gear shaft 23 has a tooth portion 23a on its peripheral surface,
It has a cup-shaped joint portion 23b at one end thereof, and an output shaft 25a of a motor 25 fixed to the rear surface (the right side in FIG. 2) of the carriage body 18 is fitted to the joint portion 23b. On the other hand, the reversing shaft 24 is hollow,
It extends through the carriage body 18 in the front-rear direction. A large gear 26 that meshes with the tooth portion 23a of the gear shaft 23 is attached to a portion of the reversing shaft 24 located inside the carriage body 18. The rotation of the motor 25 is transmitted to the reversing shaft 24 via the gear shaft 23 and the large gear 26,
The inversion shaft 24 comes to rotate at a low speed. The motor 13 that drives the toothed belt 12 and the motor 25 that rotates the revolving shaft 24 are controlled so as to operate synchronously on the left and right.

Inverting shaft 24 extended forward of the carriage body 18
An intermediate portion of a support arm 27 extending in a direction orthogonal to the axis of the shaft is fixed to the tip of the. Support arm 22
A clamp unit 28 for holding the work W is attached to one end of the. The clamp unit 28 is provided with a pair of openable and closable clamp arms 30 (facing vertically to the paper surface of FIG. 2) to which clamp jaws 29 (FIGS. 5 and 6) described later are attached. Also, the support arm 27
A cylinder (air cylinder) 31 is attached to the other end of
Output shaft 31 of the cylinder 31 extended in the support arm 27
The a and the clamp arm 30 are connected via a link mechanism 32. The pair of clamp arms 30 is a cylinder 31
The link mechanism 32 operates in accordance with the expansion and contraction of the work piece to open and close, and the workpiece W can be gripped by the clamp jaw 29 attached to the tip thereof. And support arm 27
Pivots in a plane parallel to the travel direction of the carriage 16 and around the axis C ₁ of the shaft by rotating the reversing shaft 24 by operation of the motor 25, when the clamp arm
30, because the gripping center C ₂ is a predetermined amount offset from the axis C ₁ of the reversing shaft 24 becomes as swayed largely.

The reference numeral 33 designates a pair of shock absorbers provided on the support arm 27 so as to be spaced apart from each other, and is an output shaft 31a of the cylinder 31.
It engages with an engagement bar 34 fixed in the middle of the stroke, and serves to regulate the stroke end of the cylinder 31. Reference numeral 35 is a header (FIG. 2) attached to the rear end of the reversing shaft 24 for supplying and discharging the air supplied to the cylinder 31, and a hose (not shown) connecting the header 35 and the cylinder 31 is a reversing shaft. 24 hollow interiors are extended. In addition, 36 is a carriage 16
A cable bear (FIG. 2) attached to a bracket 37 provided on the carriage base 17 of FIG. 2 flexibly feeds a cable connected to the motor 25 or hoses connected to the header 35 according to the traveling of the carriage 16. Have a function.

Here, the clamp jaws 29 attached to the clamp arm 30 have a U-shaped main body as shown in FIGS. 5 and 6.
29a, a claw portion 29b provided at the tip of the main body 29a, and an engaging portion 29c protruding from the center of the base end of the main body portion 29a. The clamp jaw 29 is attached to the clamp arm 30 with one touch by inserting the engaging portion 29c into the locking hole 30a of the clamp arm 30. As the clamp jaws 29, as shown in FIG. 6, the tip shapes of the claw portions 29b are different between the pair of clamp arms 30, and thereby the draw bead Wa at the edge of the work W is firmly fixed. It can be held.

On the other hand, the unloader 6 and the loader 7 have almost the same structure and are configured as shown in FIG. In the figure, reference numeral 40 is a main body supported by the pillar 9, and 41 is an elevating body slidably attached to the main body 40 via a linear slide guide 42. A ball screw 44 rotatably driven by a motor 43 is vertically arranged in the main body 40, and a connection arm 45 extending from the elevating body 41 is screwed into the ball screw 44, and Lifting body by operation
41 can move up and down arbitrarily. The elevating body 41 is formed in a hollow shape, and the wall thereof is provided with a slot 41a extending vertically. A slider (not shown) is slidably housed inside the elevating body 41, and the base end of an arm assembly 46 constituting a parallelogram link is axially attached to the slider by using the slot 41a. There is.

Further, a motor 47 with a speed reducer is attached to the lower end of the lifting body 41, and the output shaft of the motor 47 and the arm assembly 46.
The one side is connected by a link 48. When the motor 47 operates, the link 48 swings as shown by the arrow a, and the arm assembly 46 follows this and swings between the solid line position and the broken line position with the upper side thereof as a reference. At this time, arm assembly 46
Since the base end of the arm assembly 46 moves vertically by sliding the slider, the lower side of the arm assembly 46 has a constant movement line L.
Move horizontally as indicated by arrow b. A holder 49 is provided at the lower end of the arm assembly 46, and a work W is attached to the holder 49.
Is attached to hold a vacuum cup 50. Therefore, the work W held in this vacuum cup 50
Also moves horizontally as indicated by arrow b.

Hereinafter, the operation of the work transfer device configured as described above will be described with reference to FIG.

At the time of transferring the work, the pair of reversing machines 5 suspended and held by the transfer device 4 are preliminarily set on the rails 10 as shown in FIG.
Is positioned on the left end of the press, that is, on the press machine 1 side in the previous step. The work W, which has been processed by the press machine 1 in the previous step, is first held by the vacuum cup 50 of the unloader 6, and then the arm assembly 46 is swung by the operation of the motor 47, so that the pair of reversing machines 5 of the pair of reversing machines 5 can be operated. It is carried in between. The support arm 27 of the reversing machine 5 is in a horizontal state in advance, and after waiting for the work W to be loaded, each pair of clamp arms 30 of the clamp unit 28 is operated from the open position to the closed position by the operation of the cylinder 31. The work W is kept horizontal and is gripped by the clamp jaws 29. At this time, the gripping position of the clamp jaws 29 is approximately the center of the work W in the longitudinal direction.

Next, the toothed belt 12 is made to travel by the operation of the motor 13 of the conveying device 4, and the carriage 16 of the reversing machine 5 is moved to the right end portion of the rail 10, that is, to the press machine 2 side in the subsequent process. Simultaneously with the start of this movement, the reversing shaft 24 is rotated counterclockwise as viewed in FIG. 1 by the operation of the motor 25 of the reversing machine 5. The rotation of the reversing shaft 24 causes the support arm
27, that is, the clamp unit 28 pivots about the axis C ₁ of the reversing shaft 24, and the workpiece W held by the clamp jaw 29 is reversed by 180 °. The gripping center C ₂ (FIG. 2) of the clamp arm 30 with respect to the work W is offset from the axis C _{1 of the} reversing shaft 24, so that the reversing loci at both ends of the work W are as shown in FIG. , Large downward and small upward. The turning radii in the downward and upward directions are [l + δ] in the downward direction and [l−δ] in the upward direction, where the offset amount is δ and the half length of the work W is l.
Becomes That is, as the reversal locus in the upward direction becomes smaller, the interference area of the work with the unloader 6 becomes narrower, and the unloader 6 transfers the work W to the reversing machine 5 and then raises the elevating body 41 slightly by the operation of the motor 43. Only then can the arm assembly 46 be returned to its original position.

The reversal of the work W is completed until the reversing machine 5 reaches the vicinity of the center of the rail 10, and then the reversing machine 5, as shown by the broken line in FIG. Move to the side of machine 2. At this position, the work W is first held in the vacuum cup 50 at the tip of the loader 7, and then the clamp jaws 29 of the clamp unit 28 are opened.
The work W is released from the reversing machine 5. After that, loader 7
When the arm assembly 46 swings by the operation of the motor 47, the work W is loaded into the press machine 2 in the subsequent process, while the reversing machine 5 is moved to the original position by the traveling of the toothed belt 12 in the reverse direction. After returning, the next work is conveyed thereafter by repeating the above operation.

According to the above-mentioned embodiment, since the toothed belt 12 is used as the driving means for moving the reversing machine 5, slippage is prevented and the reversing machine 5 can be positioned with high accuracy.
It is needless to say that this driving means may use other means instead of using the toothed belt 11. Further, in the above embodiment, the mount 8 of the transfer device 4 is of a ceiling suspension type,
This gantry may be provided as a floor stationary type.

(Effects of the Invention) As described above in detail, according to the work transfer device of the present invention, the gripping center of the clamp arm is offset from the turning center to reduce the reversal locus of the work upward. It is possible to avoid interference with the ceiling-mounted unloader and loader even when approaching the press machine and reversing the work. The effect that can be effectively applied to the reverse conveyance between presses with a small distance was obtained.

[Brief description of drawings]

FIG. 1 is a front view showing the entire structure of a work transfer device according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 4 is a sectional view taken along the line IV-IV of FIG. 2, FIG. 5 is a perspective view showing an assembly structure of a clamp unit which is a part of the present invention, and FIG. 6 is a clamp. FIG. 7 is a cross-sectional view of a clamp jaw that constitutes a unit, FIG. 7 is a front view showing the structure of an unloader and a loader which are part of the present invention, and FIG. 8 is an explanatory view showing a reverse trajectory of a work according to the present invention. . 1, 2 ... Press machine 4 ... Transfer device 5 ... Reversing machine 6 ... Unloader 7 ... Loader 10 ... Rail 24 ... Reversing shaft 27 ... Support arm 30 ... Clamp arm

Claims (1)

(57) [Scope of utility model registration request] 1. A ceiling suspension type unloader for taking out a work from one of the press machines, a pair of left and right reversing machines for reversing the work by receiving the work from the unloader, and a suspension between each of the reversing machines between two press machines. And a supporting arm that receives a work from the reversing machine and transfers the work to the other pressing machine, and the reversing machine revolves in a vertical plane parallel to the work transfer line. And a clamp arm for gripping a work, wherein the clamp arm is attached to the support arm with a center of gripping being offset from a pivot center of the support arm.