WO1997033710A1 - Correction device for transfer feeder - Google Patents

Abstract

A motion pattern is not affected by a change in a path line. A transfer feeder comprises a plurality of cross bars (12) which are provided in a transfer press body (1) having a plurality of processing stations W1, W2, --- and are adapted to be actuated in a feed direction X by a feed means (20) composed of a feed cam (20b) rotated by power taken out from the transfer press body (1) and a feed lever (20a), which is adapted to be swung by the feed cam (20b), and to be actuated in a lift direction Y by a lift means (3) driven by a servomotor. In the transfer feeder, a cross bar carrier (4) provided on a most upstream side is divided into a main carrier (41) and a sub-carrier (42), and provided between the carriers (41, 42) are a hydraulic cylinder (7a) for correcting an error in the feed direction X caused when the path line is changed, and a correction means 7 composed of a servo valve for controllingly contracting and extending the hydraulic cylinder (7a).

Description

 Description Transfer feeder correction device

 The present invention relates to a transfer feeder correction device that corrects a motion pattern so as not to change even if a pass line is changed by changing the height of a crossbar. Background art

 Conventionally, in a transfer press having a plurality of processing stations in a press body, a transfer feeder is provided in the press body, and the transfer feeder is configured to sequentially convey a work to each processing station. I have.

 In the transfer feeder, a plurality of crossbars each having a work suction means are bridged at equal intervals between a pair of transfer bars arranged in the feed direction, and these crossbars are moved in the feed direction and the lift direction. By driving the workpiece in the two-dimensional direction, the workpiece is attracted by the workpiece suction means and transported to each processing station sequentially. For example, Japanese Utility Model Application Laid-Open No. 3-243435, It has been proposed in, for example, Japanese Unexamined Patent Publication No. 4-466645.

In the transfer feeder disclosed in the above publication, a lift variable mechanism and a height adjustment device are provided in the crossbar located at the most upstream side among a plurality of crossbars horizontally laid between the transfer bars, and the most upstream crossbar is provided. The height of the bar can be adjusted arbitrarily. However, in the above-mentioned conventional transfer feeder, the height of the uppermost cut bar can be adjusted, but the height of the other crossbars cannot be adjusted. The work height (pass line) cannot be easily changed depending on the height.

 To remedy this problem, there has been proposed a transfer feeder in which the crossbar feed direction is driven by a cam and the lift direction is driven by a lift mechanism driven by a servomotor.

 The conventional transfer feeder described above has a cam a which is rotated by the power taken out of the press as shown in FIG. 1, and the feed lever b whose upper end is pivotally supported is swung by the force a. The crossbar carrier d connected to the lower end of the feed lever b via a link c is driven in the feed direction, and the lift direction of the crossbar e is controlled by a lift mechanism (not shown) using a servomotor as a drive source. ) To obtain a motion pattern as shown by f in Fig. 1.

 Changing the work pass line from to h in the conventional transfer feeder can be easily performed by changing the command value to the lift mechanism.

However, since the drive in the feed direction is performed by cam a, if the height of the crossbar is changed and the pass line is changed from g to h, the length of link c is constant, so the link c and crossbar carrier The movement pattern f of the crossbar e shifts by j in the feed direction as a result of the movement of the pivot point i to the force i 'of the d, and the work suction means (not shown) provided on the crossbar e moves the work pattern. Can not adsorb the specified position And the crossbar e and the work suction means interfered with the mold and slide.

 On the other hand, the lift lever and the lift are disclosed in Japanese Utility Model Laid-Open Publication No. Sho 56-142422, Japanese Patent Publication No. Sho 61-0728, Japanese Utility Model Laid-open Publication No. There has been proposed a transfer feeder in which the height of a transfer cover can be changed by adjusting the length of a rod (rack) connecting between the transfer mechanisms.

 In the transfer feeder described in the above-mentioned Japanese Utility Model Application Publication No. 56-1424282 and Japanese Patent Publication No. 61-060728, the lift lever that is swung by a cam and the transfer bar are moved up and down. A cylindrical stopper having a plurality of steps is rotatably provided in the middle of the rack connecting the moving lifting mechanisms, and the stopper is rotated to an arbitrary angle by the adjusting cylinder, and the stopper is rotated. By selecting the step, the height of the transfer bar can be adjusted in multiple steps.

 In the transfer feeder described in Japanese Utility Model Laid-Open Publication No. 63-252220, the stroke can be adjusted steplessly by screw feed between a lift lever that is swung by a cam and a lift mechanism. By providing a mechanism, the height of the transfer bar can be adjusted steplessly.

 However, each transfer feeder requires a lot of space for installation due to the complicated configuration in which a cylindrical stopper and screw feed mechanism are provided in the height adjustment mechanism, and the adjustment device becomes expensive. There was a problem.

The present invention has been made in order to improve such a problem, and the motion pattern can be changed even when the pass line is changed by changing the height of the mouth bar. It is an object of the present invention to provide a transfer feeder correction device for performing correction so as not to affect the transfer with a simple configuration at a low cost.

Disclosure of the invention

 In order to achieve the above object, the invention according to claim 1 is characterized in that the feed force is provided in a transfer press body having a plurality of aesthetics, and is rotated by the power taken out from the transfer press body. A transfer mechanism having a plurality of crossbars operated in the feed direction by feed means consisting of a feed lever oscillated by a single cam and operated by lift means driven by a servomotor. A hydraulic cylinder and a hydraulic cylinder, which divide the crossbar carrier provided on the most upstream side into a main carrier and a subcarrier, and correct an error in the feed direction caused when the pass line is changed between these carriers, are provided. A correction means including a servo valve for controlling expansion and contraction is provided.

 According to the first aspect of the present invention, when the pass line is changed in accordance with the size of the workpiece, the height of the mold, and the like, the pass line is provided between the main carrier and the sub carrier of the uppermost sub mouth. Since the correcting means including the hydraulic cylinder expands and contracts and moves and adjusts the sub-carrier in the feed direction with respect to the main carrier, it is possible to correct an error in the feed direction caused by changing the pass line.

As a result, even if the pass line is changed, the motion pattern is not affected, so that the work suction position of the work suction means is shifted, which may cause a misfeed or may cause the work suction means to slide. It is possible to eliminate defects such as a mold and the like. In addition, since automatic correction can be performed simply by extending and retracting the hydraulic cylinder by controlling the servo valve by the control means, there is no need for manual work such as entering the press and making adjustments, so changing the pass line In addition, the setup work associated with the above can be performed easily and safely, and it is only necessary to install a correction means such as a hydraulic cylinder in the crossbar carrier, so that the configuration can be provided simply and at low cost.

 In order to achieve the above object, the invention according to claim 2 is characterized in that a feed force is provided in a transfer press main body having a plurality of aesthetics, and is rotated by power taken out from the transfer press main body. In a transfer feeder having a plurality of crossbars which are operated in the feed direction by feed means consisting of a feed lever and a feed lever which is oscillated by a servomotor, and which are operated in the lift direction by lift means driven by a servomotor. A correcting means comprising a hydraulic cylinder and a servo valve for controlling the expansion and contraction of the hydraulic cylinder is provided in the middle of a link connecting the above-mentioned feed lever and the crossbar carrier provided at the most upstream position.

According to the second aspect of the present invention, when the pass line is changed according to the size of the workpiece, the height of the mold, etc., the crossbar carrier provided on the most upstream side is connected to the feed lever. The correction means consisting of a hydraulic cylinder provided in the middle of the link to be expanded and contracted changes the length of the link, thereby correcting the error caused by the change of the pass line. Since it does not affect the motion pattern, it is possible to eliminate problems such as misalignment of the workpiece suction position by the workpiece suction means, which may cause misfeeds, and interference of the workpiece suction means with the slide die. it can. In addition, since automatic correction can be performed simply by extending and retracting the hydraulic cylinder by controlling the servo valve by the control means, there is no need for manual work such as entering the press and making adjustments, so changing the pass line In addition, the setup work associated with the above can be performed easily and safely, and it is only necessary to install a correction means such as a hydraulic cylinder in the link, so that the configuration can be provided simply and at low cost.

 In order to achieve the above object, the invention according to claim 3 includes a feed cam which is provided in a transfer press main body having a plurality of estheses and is rotated by power taken out from the transfer braces main body, and a feed cam provided by the feed cam. In a transfer feeder having a plurality of crossbars operated in a feed direction by feed means including a swinging feed lever and operated by lift means driven by a servomotor, A correction means consisting of a mechatronic cylinder and a servo cylinder, which is controlled to expand and contract by electric signals, is provided in the middle of the link connecting the feed lever and the crossbar carrier provided at the uppermost stream. .

According to the third aspect of the present invention, when the pass line is changed in accordance with the size of the work, the height of the mold, etc., the space between the crossbar carrier provided on the most upstream side and the feed lever is changed. Correction means consisting of a hydraulic cylinder provided in the middle of the link to be connected expands and contracts, changing the length of the link to correct the error caused by the change of the pass line. Does not affect the motion pattern, eliminating problems such as misalignment of the workpiece suction by the workpiece suction means, causing misfeeds, and interference of the workpiece suction means with the slide die. Can be. In addition, since automatic correction can be performed simply by controlling the expansion and contraction of the mechatronics cylinder and servo cylinder by electric signals, no manual work such as entering the press and making adjustments is required, so setup for changing the pass line The work can be performed easily and safely, and it is only necessary to install a correction means such as a hydraulic cylinder in the link, so that the structure can be provided simply and at low cost. BRIEF DESCRIPTION OF THE FIGURES

 The invention will be better understood from the following detailed description and the accompanying drawings, which show embodiments of the invention. The embodiments shown in the accompanying drawings are not intended to specify the invention, but merely to facilitate explanation and understanding.

FIG. 1 is an explanatory diagram showing the operation of a conventional transfer feeder. FIG. 2 is a front view of a transfer press equipped with a transfer feeder according to an embodiment of the present invention. FIG. 3 is a plan view of the transfer feeder according to the embodiment of the present invention. FIG. 4 is an arrow view from the IV direction in FIG. FIG. 5 is a bottom view of the crossbar carrier provided in the transfer feeder according to the embodiment of the present invention. FIG. 6 is an enlarged front view of the crossbar carrier provided in the transfer feeder according to the embodiment of the present invention. FIG. 7 is an arrow view from the YE direction in FIG. FIG. 8 is an enlarged front view showing a crossbar carrier other than the crossbar carrier provided on the most upstream side of the transfer feeder according to the embodiment of the present invention. FIG. 9 is a view from the direction of arrow Κ in FIG. FIGS. 10A and 10B show the operation of the transfer feeder correcting device according to the embodiment of the present invention. FIG. FIG. 11A and FIG. 11B are explanatory diagrams of a correction device according to another embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

 Embodiments of the present invention will be described in detail with reference to the drawings shown in FIG. Fig. 2 is a front view of a transfer press equipped with a transfer feeder adopting the vacuum transfer method, Fig. 3 is a plan view of a transfer feeder, Fig. 4 is a view from the IV direction in Fig. 2, and Fig. 5 is Bottom view of crossbar carriers connected to each other, Fig. 6 is an enlarged front view of the crossbar carrier provided on the most upstream side, Fig. 7 is an arrow view from the VI direction in Fig. 6, and Fig. 8 is 9 is an enlarged front view of the crossbar carrier, FIG. 9 is a view taken in the direction of the arrow IX in FIG. 8, and FIGS. 10A and 10B are operation explanatory diagrams. The transfer feeder shown in FIGS. 2 to 4 is provided in the transfer press body 1 and has a pair of lift beams 2 in the feed direction X. These lift beams 2 are spaced apart in the feed direction X. A plurality of lift means 3 are provided and can be moved up and down in the lift direction Y.

The lift means 3 has a lift motor 3a consisting of a servo motor, and the pinion 3b is rotated forward and reverse by the lift motor 3a. Each pinion 3b is coupled to a rack 3d formed on a lift rod 3c, and each lift rod 3c is simultaneously moved up and down in the lift direction Y by rotation of the pinion 3b. The lift beam 2 is connected to the lower end of the lift rod 3c, and the vertical movement of the lift rod 3c causes the front and rear lift beams 2 to move up and down simultaneously. A plurality of crossbar carriers 4 are supported on the lift beams 2 at intervals in the feed direction X.

 Of the above crossbar carriers 4, the crossbar carrier 4 provided at the most upstream side is, as shown in FIGS. 6 and 7, the main carrier 4,

Projecting and be divided into sub Kiyarya 4 _2, with a pair of upper and lower mouth one La 5 are rotatably supported respectively at both ends, the lower end sides of the Rifutobi Ichimu 2 between these rollers 5 It has been optionally Guy Doreru 2 a is located, the main Kiyarya 4, and the sub Kiyarya 4 ₂ tailed below Rifutobi one arm 2 so as to be movable in the feed direction X along the guide Dre le 2 a Have been.

And the main Kiyarya 4, between the sub Kiyarya 4 _2, the correcting means 7 for correcting so as not to affect the motion pattern Changing the pass line by changing the height of the crossbar in the action described below Provided.

The compensating means 7 is composed of, for example, a hydraulic cylinder 7a and a servo valve (not shown) for controlling the hydraulic cylinder 7a. The base end of the hydraulic cylinder 7a protrudes below the main carrier 4, It is pivotally connected to bracket 4a by pin 8.

From the hydraulic cylinder 7 a and Bisuton rod 7 to the sub Kiyarya 4 ₂ side is projected, the piston rod 7 b of the tip is pivotal by a bracket 4 b a pin 9 projecting from the lower part of the sub Kiyarya 4 ₂ It is wearing, by stretching the piston rod 7 b, the main Kiyarya 4, and summer as a sub Kiyarya 4 ₂ can be shifted to the feed direction X.

Also on the lower surface of the sub Kiyarya 4 ₂ tilting means 1 0 is provided in the direction orthogonal to the Fi once direction X. Each tilting means 1 0 rotary shaft 1 0 a of being projected to the sub Kiyari catcher 4 ₂ side opposite to the longitudinal direction, the cross bar 1 between mutually opposing sub Kiyarya 4 ₂ of the chill Bok means 1 0 Both ends are detachably supported.

 The crossbars 12 are formed of a long rectangular steel pipe or the like, and a plurality of crossbars 12 are arranged at intervals in the feed direction X as shown in FIG. 2a can be connected to the end of the rotating shaft 10a of the tilting means 10 and each cross bar 12 has a plurality of workpiece suction means 13 such as a vacuum cup. The work 14 is detachably mounted via a, so that the work 14 can be sucked by the work suction means 13.

Meanwhile crossbar Kiyari catcher 4 cross Bakiyarya 4 other than those provided on the most upstream side, as shown in FIGS. 8 and 9 are substantially the same structure as the sub Kiyarya 4 _2.

 In other words, before and after the crossbar carrier 4, rollers 5 for holding the guide rails 2a from above and below are provided rotatably, and these rollers 5 allow the lower part of the lift beam 2 to be fed in the feed direction X. It is suspended on its own. Each of the crossbar carriers 4 is provided with a tilting means 10, and each of the tilting means 10 is provided with a rotation shaft 10 a protruding from the crossbar carrier 4 facing the front-back direction. In addition, both ends of the cross bar 12 similar to the above-described cross bar 12 are detachably mounted between the rotation shafts 10a via the connecting members 12a.

In addition, a subcarrier 4 _{2 of the} crossbar carrier 4 provided on the most upstream side And the crossbar carrier 4 provided downstream thereof are connected to each other by connecting means 15 consisting of rods of a fixed length provided so as to be located below the lift beam 2. Each crossbar carrier 4 becomes a body and can reciprocate in the feed direction X, and the main carrier 4 of the crossbar carrier 4 on the most upstream side has a front part. Connecting pieces 16 are protruded, and one end of a link 18 is connected to these connecting pieces 16 via a ball bearing 17 and a pin 17a.

 The other end of the link 18 is connected to the lower end of the feed lever 20 a of the feed means 20 installed on the upper part of the upstream side of the transfer press body 1. The feed means 20 has a camshaft 20b rotated by power taken out from a slide drive mechanism (not shown) of the transfer press body 1, and is attached to the camshaft 20b. The lower end of the feed lever 20a is swung in the feed direction X about the support at the upper end by the feed cam 20c. Each crossbar carrier 4 can be reciprocated in the feed direction X via 8.

 Signals from the correction means 7 mounted on the crossbar carrier 4, the piping for supplying power such as hydraulic pressure to the tilt means 10, etc., and signals from various detection means provided on the crossbar carrier 4 are transmitted. The electric cables for supplying electric power (none of them are shown) are accommodated in a cable carrier 21 shown in FIGS. 6 to 9. In FIG. 4, 1a indicates a slide.

Next, the operation of the above-configured transfer feeder will be described. The plate-like work to be molded is located upstream of the transfer press body. It is carried in by the work carrying means 22 from the side (left side in Fig. 2). Next, the feed lever 20a is swung by the feed cam 20c rotated by the power taken out from the slide drive mechanism of the transfer press body 1, and the link 18 is connected to the feed lever 20a. The crossbar carrier 4 connected via this is moved to the upstream side, and at the same time, the lift means 2 raises the lift beam 2, so that it stands by at the standby position set at almost the middle point of the entire stroke The crossbar 12 is moved along the preset motion pattern to a position above the work 14, and is lowered when it reaches the position above the work 14. The work suction means 13 attached to the work suctions the work 14 carried into the transfer press body 1, and the work suction means 13 downstream from the work suction means 13 is composed of the processing stations W2, W3,. Adsorbing the workpiece 1 4 was completed.

 After that, since the lift beam 2 is lifted by the lift means 3, the cross bar 12 is also raised according to the predetermined operation pattern, and the work 14 sucked by the work suction means 13 approaches the pass line P. By the way, since the feed lever 20a is swung, each crossbar carrier 4 is moved in the feed direction X, and the crossbar 12 starts an advanced operation.

Then, when the work 14 reaches the next processing station W2, W3... Near the upper part, the lift beam 2 is lowered by the lift means 3, and the crossbar 12 is lowered along a predetermined motion pattern. Then, the work 14 is carried into the machining stations W 2, W 3…. Thereafter, when the work suction means 13 releases the work 14, the crossbar 1 2 starts the return operation, and the crossbar 1 2 moves to the first standby position. And stopped at the standby position. Thereafter, the above operation is repeated in synchronization with the operation of the transfer press main body 1, and the work 14 carried into the transfer press main body 1 is sequentially processed by each of the processing stations W2, W3, and so on. The completed work 14 is unloaded from the transfer body 1.

 On the other hand, when the pass line P is changed to P ′ as shown in A of FIG. 10 according to the shape of the work 14 and the height of the mold to be used, the pass lines P,変 更 'change.

 As a result, the cross bar carrier 4 is lifted by the lift means 3 together with the lift beam 2, so that the cross bar 12 is also raised. At this time, since the feed lever 20a is in a stopped state, the pivot point 〇 'of the crossbar carrier 4 and the link 18 is vertically moved around the pivot point O of the feed lever 20a and the link 18 As the lift beam 2 rises, the crossbar carrier 4 is moved to the downstream side, and the crossbar 12 supported by the crossbar 4 passes through the path as shown in Fig. 10A. An error L occurs in the feed direction X depending on the height of the lines P and P '.

Conventionally, the error L caused a problem that the peak suction means 13 provided on the crossbar 12 could not be suctioned at a predetermined position on the work 14. , pass line P, by moving to scale the compensation means 7 provided in the crossbar Kiyari catcher 4 the most upstream side with a change of P 'sub Kiyarya 4 ₂ to Fi once direction X, the error L Is corrected to be 0.

That is, a correction value corresponding to the height of the pass lines P and P 'with respect to the origin position of the most upstream crossbar carrier 4 is previously stored in the control means. When the pass line is changed from P to P ', when the height of the changed pass line is input to the control means, the control means returns to the origin according to the input pass line height. The correction value from the position is read from the table, and a control signal corresponding to the correction value is output to a servo valve (not shown) of the correction means 7. As a result, the servo valve is controlled, a predetermined amount of hydraulic pressure is supplied from the support valve to the hydraulic cylinder 7a, and the piston rod 7b protruding from the hydraulic cylinder 7a is contracted. 1 0 as shown in B sub Kiyarya 4 ₂ is moved by an error L to the upstream side, it is corrected so that the error L becomes zero.

Conversely, when the feed carrier 4 moves upstream due to the change of the pass lines P and P ', and an error L in the feed direction X occurs in the crossbar 12, the control signal output from the control means the piston rod 7 b of the hydraulic cylinder 7 a is extended, the sub Kiyarya 4 ₂ so moved by the error L to the downstream side is corrected so as to become zero.

Note in the above embodiment, the Kurosubakiya Rya 4 provided on the most upstream side main Kiyarya 4, the sub Kiyarya 4 ₂ is divided into these Kiyarya 4!, The correction means 7 consisting of a hydraulic cylinder 7 a between t Although provided, the correction means 7 may be provided in the middle of the link 18 connecting the upstream-side carrier 4 and the feed lever 20a as shown in FIGS. 11A and 11B.

The correction means 7 shown in FIG. 11A divides the link 18 into two parts in the middle, connects the hydraulic cylinder 25 to one link 18, and connects the piston rod 2 protruding from the hydraulic cylinder 25. The other link 18 _{2 is connected} to 5a. Hydraulic pressure is supplied to the hydraulic cylinder 25 via a servo valve (not shown) controlled by control means, and the piston rod 25a is extended. By reducing the length, the length of the link 18 can be adjusted, so that an error generated when the pass line is changed can be corrected.

The correction means 7 shown in FIG. 11B divides the link 18 into two parts from the middle, connects the cylinder 26 a of the mechatronic cylinder 26 to one link 18, and connects it to the other link 18 ₂ . A ball screw 26 b protruding from the cylinder 26 a is connected. A ball nut (not shown) that is screwed into the ball screw 26 b is housed in the cylinder 26 a. You. The length of the link 18 can be adjusted by rotating this ball nut by a thermopowder 26c controlled by an electric signal output from the control means to expand and contract the ball screw 26b. It is possible to correct an error that occurs when the line is changed.

Claims

The scope of the claims 1 A feed cam 20 c provided in the transfer press body 1 having a plurality of processing stations W l, W… and rotated by the power taken out from the transfer press body 1, and the feed cam 20 c A plurality of crosses operated in the feed direction X by the feed means 20 composed of the oscillating feed lever 20a and operated in the lift direction Y by the lift means 3 driven by a servomotor. in transfer feeder with bars 1 2, divides the crossbar Kiyari catcher 4 provided on the most upstream side main Kiyarya 4, and the sub Kiyarya 4 _2, and between these Kiyarya 4 ,, 4 _2, Pasura fin A truss comprising a hydraulic cylinder 7a for correcting an error in the feed direction X caused by a change and a correction means 7 comprising a servo valve for controlling expansion and contraction of the hydraulic cylinder 7a. Sufafida of the correction device. 2 A feed cam 20 c provided in the transfer press body 1 having a plurality of processing stations W 1, W 2,... And rotated by the power taken out from the transfer press body 1, and a feed cam 20 c The feed lever 20 oscillated by c is operated in the feed direction X by the feed means 20 and the lift lever 3 driven by the servo motor is operated in the lift direction Y by the lift means 3. In the trans feeder having the cross bar 12 of the above, in the middle of the link 18 connecting the feed lever 20a and the crossbar carrier 4 provided at the most upstream, the hydraulic cylinder and the expansion and contraction of the hydraulic cylinder are performed. A correction device for a transfer feeder, comprising a correction means 7 comprising a servo valve for control. 3 A feed cam 20 c mounted in the transfer press body 1 having a plurality of processing stations Wl, W 2,... And rotated by the power taken out from the transfer press body 1, and the feed cam 20 c A plurality of crossbars 1 2, which are operated in the feed direction X by the feed means 20 composed of the oscillating feed lever 20 a and are operated in the lift direction Y by the lift means 3 driven by a servomotor. In a transfer feeder having a mechanism, a mechatronic cylinder controlled in expansion and contraction by an electric signal is provided in the middle of a link 18 connecting the feed lever 20a and the crossbar carrier 4 provided at the uppermost stream. A correction device for a transfer feeder, comprising a correction means 7.