JP3932611B2 - Crossbar interference prevention device for transfer press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crossbar interference preventing device for a transfer press in which a conveying operation is performed by a combination of a servo motor and a pinion rack.
[0002]
[Prior art]
In the transfer press, the cam mechanism method that synchronizes the lifting and lowering operations of the mold and the workpiece transfer operation was adopted. However, due to the recent demand for higher speed, the above transfer operation is replaced by the cam mechanism method and the servo motor and pinion.・ A system that allows the combination of racks, etc. has been proposed.
[0003]
FIG. 5 shows an outline of an example, and on the bed 1 laid along the press line L, the columns 2 are respectively arranged in the press line L direction so as to face each other across the press line L from the left and right directions. A press housing 4 is constructed by extending a crown 3 having a web structure between the upper ends of the columns 2 on both the left and right sides, and between the columns 2 along the press line L direction in the press housing 4. The slides 5 are arranged so as to be movable up and down at the positions, and upper molds are set on the lower surfaces of the slides 5, and the upper molds are placed on the bolsters 6 provided on the upper surface of the bed 1 between the columns. A lower die is set in correspondence with the die, a plurality of press portions are formed along the press line L direction, and a slide drive device 7 incorporated in the crown 3 is used to slide each press portion. Ido 5 by vertically moving, Aru work such as a panel between upper and lower molds so as to be press-molded.
[0004]
Further, in order to match the timing with the above press forming operation and sequentially convey the workpiece to the next press section, on the inner surface of each column 2 facing the press line L in the direction of the press line L A pair of extending guide beams 8 is fixed, and the guide beams 8 are movably engaged and supported by carriages 9 arranged in accordance with the arrangement interval of the molds, and the carriages 9 are fed along the press line L direction. The rods 10 are connected to each other by the bar 10 and the lifting rods 11 are assembled to the carriages 9 so as to be lifted and lowered by a lifting drive device such as an AC servo motor (not shown). A crossbar 13 having a workpiece gripping tool 12 such as a vacuum cup is spanned between the lower end portions of the motor 11, and the lifting drive devices are driven in synchronization. By crossbar 13 via the lifting rod 11 are so brought up and down.
[0005]
Further, a feed servo motor (AC servo motor) 14 is installed at an upstream position in the press line L direction of the press housing 4, and a feed pinion 16 attached to an output shaft 15 of the feed servo motor 14 is provided. The feed bar 10 is moved in the direction of the press line L by meshing with a rack 17 carved at the upstream end of the feed bar 10 and transmitting the driving force of the feed servo motor 14 to the rack 17 via the pinion 16. In this way, the crossbar 13 is given a conveying operation.
[0006]
[Problems to be solved by the invention]
However, in the case of the transfer press, the drive of the feed servomotor 14 is controlled by the slide drive device 7 so that the crossbar 13 is conveyed based on the vertical movement of the slide 5 of each press portion. Since the vertical movement of the slide 5 and the conveying operation by the feed servo motor 14 are independent, when an abnormality occurs in the feed servo motor 14, the workpiece gripping tool 12, the cross bar 13 and the mold interfere with each other. May be damaged. That is, in the above-described transfer press, the cross bar 13 provided with the work gripping tool 12 is caused to perform a conveying operation in the direction of the press line L and a lifting operation, and is gripped by the work gripping tool 12 of the cross bar 13. The workpiece is conveyed between the upper and lower molds of each press unit in conjunction with the vertical movement of the slide 5 as a press operation by the slide drive device 7, and after the conveyance, the cross bar 13 is moved between the upper and lower molds. For example, the cross bar 13 is moved to a retracted position where it does not interfere, and after pressing, the cross bar 13 is returned from the retracted position to the initial position, the workpiece is gripped, and conveyed to the press unit again. If a situation occurs in which the drive of the feed servo motor 14 stops when the bar 13 is positioned in the press section, the cros Will be a bar 13 resulting in the press operation is performed in a state in which the intervening workpiece grasper 12, the cross bar 13, the workpiece will be possibly damage the course that the upper and lower molds. In particular, since the mold is expensive, if the above-mentioned damage accident occurs, it causes a great deal of damage.
[0007]
Therefore, the present invention avoids the interference between the die and the crossbar caused by the press even if an abnormality occurs in the feeding operation of the feed bar, and causes a damage accident of the die or the like. A crossbar interference prevention device for transfer press that keeps the crossbar in the standby position (the space between the molds) while the mold is closed in the middle of sliding down. It is something to be offered.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a feed rack bar arranged in parallel with the feed bar at the end of the feed bar on the upstream side in the press line direction, and integrally attached thereto. comprising a feed pinion rack mechanism comprising a feed pinion, as given transport operation of the press line direction to the feed bar through the feed pinion rack mechanism by a servo motor for feed to the feed bar, the cross bar with workpiece grasper in correspondence with the arrangement interval of the die is supported so as to be perpendicular to the press line, a press line perpendicular upstream outer wall surface of the且Tsusu ride, toward from bottom to top An anti-interference plate cam that extends to the upstream side in the press line direction is attached, and further, the anti-interference plate cam and the feed Between the rack bar, a structure obtained by interposing an interference prevention mechanism to move the feed bar to press line direction through the feed rack bar downward displacement of the interference preventing plate cam.
[0009]
When the interference prevention plate cam is lowered as the slide is lowered, the feed rack bar of the interference prevention mechanism is moved to the upstream side in the press line direction due to the lowering. Even if the feed bar is stopped, the cross bar is forcibly paid out to a position where it does not interfere with the mold by the feed bar being pushed back upstream or downstream in the press line direction.
[0010]
In the above configuration, the interference prevention mechanism includes a pressing rack bar that presses the cam follower at the tip against the interference prevention plate cam from the upstream side to the downstream side of the press line by the pressing force of the pressing cylinder; An interference preventing rack bar arranged so that a minute clearance is formed between the end surface of the rack bar on the upstream side or downstream side of the press line , and interposed between the interference preventing rack bar and the pressing rack bar. In the normal operation, the pressing rack bar is pressed against the interference preventing plate cam by the action of the pressing cylinder, so that the interference preventing rack bar is used as the feed rack. Follow-up operation is possible while maintaining a small clearance between the bars.
[0011]
On the other hand, the press line perpendicular downstream outer wall surface of the slide, mounting the regulating plate cam so as protrude to the downstream side of the press line direction towards from bottom to top, and the falling displacement of the regulating leaf cam Provided with a stopper mechanism for lowering the vertical rack and bringing the lower end of the vertical rack into contact with a locking piece fixed at a required position of the feed bar to restrict movement of the feed bar in the press line direction By adopting the configuration, the position of pushing back the feed bar is regulated by the stopper mechanism, so that the runaway of the feed bar is prevented.
[0012]
Further, the stopper mechanism includes a pressing rack bar configured to press the cam follower at the front end against the regulating plate cam from the downstream side to the upstream side of the pressing line by the pressing force of the pressing cylinder, and the rack bar and the vertical rack. A pressing rack is provided by the action of the pressing cylinder by comprising a power transmission gear interposed between them to transmit power so that the vertical rack is displaced downward by the downward displacement of the regulating plate cam. Since the bar is pressed against the regulating plate cam, the vertical rack can be raised and lowered accurately in accordance with the up and down movement of the slide.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
1 (a) and 1 (b) show an embodiment of the present invention. In a servo motor drive type transfer press having the same configuration as shown in FIG. Instead of meshing the feed pinion 16 of the feed servomotor 14 with the rack 17, a feed rack bar 18 arranged in parallel with the feed bar 10 is arranged on the upstream end of the feed bar 10 with a vertical rod. A feed pinion rack mechanism 20 is formed by engaging the feed pin bar 16 of the feed servo motor 14 with the feed rack bar 18.
[0015]
Further, an interference preventing plate cam 27 is attached to the upstream outer wall surface perpendicular to the press line L of the slide 5 so as to project from the bottom to the upstream side in the press line L direction. Between the prevention plate cam 27 and the feed rack bar 18 of the feed pinion rack mechanism 20, the up-and-down displacement of the interference prevention plate cam 27 accompanying the vertical movement of the slide 5 is converted into a displacement in the press line L direction. When an abnormality occurs such as the conveyance operation of the feed bar 10 being stopped by interposing the interference prevention mechanism 28, the feed bar 10 is pushed back to the upstream side of the press line L, and the upper die 29 on the lower surface of the slide 5 and The cross bar 13 can be forcibly discharged to a position where it does not interfere with the lower mold 30 on the bolster 6.
[0016]
On the other hand, on the downstream outer wall surface perpendicular to the press line L of the slide 5 is attached a regulating plate cam 31 shaped so as to project from the bottom to the downstream side in the direction of the press line L, and for the regulation A stopper mechanism 33 that converts the vertical displacement of the plate cam 31 into the vertical displacement of the vertical rack 32 that serves as a stopper is provided, and a locking piece 34 that can come into contact with the lower end of the vertical rack 32 when lowered is a required position of the feed bar 10. The feed bar 10 is pushed back by the vertical rack 32 and the locking piece 34 so that the runaway when the cross bar 13 is pushed back to the upstream side of the press line L can be regulated.
[0017]
The interference prevention mechanism 28 includes a pressing rack bar 37 that presses the cam follower 36 against the interference prevention plate cam 27 from the press line L direction by a pressing force of a pressing cylinder 35 that encloses compressed air to the head side, and a feed. Interference prevention rack bar 38 in which a minute clearance C is formed between the feed pin bar 18 and the downstream end face of the feed rack bar 18, a power transmission gear 39, and coaxial power transmission. Gears 40 and 41, and the pressing rack bar 37 is disposed with the rack surface facing downward, and the interference preventing rack bar 38 is disposed in the press line L direction with the rack surface facing upward, and for pressing A power transmission gear 40 meshed with the power transmission gear 39 meshed with the rack bar 37, and the same as the power transmission gear 40. The upper power transmission gear 41 is engaged with the interference prevention rack bar 38, and the interference prevention rack bar 38 is moved by the up-and-down displacement of the interference prevention plate cam 27 as the slide 5 moves up and down. 18 and the minute clearance C are held so as to be advanced and retracted following the conveying operation of the feed bar 10.
[0018]
The stopper mechanism 33 includes a pressing rack bar 44 that presses against the restricting plate cam 31 from the press line L direction via the cam follower 43 by the pressing force of the pressing cylinder 42 that encloses compressed air to the head side. And a vertical rack 32 extending in the vertical direction outside the feed bar 10 and coaxial power transmission gears 45 and 46. The pressing rack bar 44 is arranged with the rack surface facing downward, and the vertical rack 32 Is arranged with the rack surface facing upstream, and the power transmission gear 45 is engaged with the pressing rack bar 44, and the power transmission gear 46 coaxial with the power transmission gear 45 is engaged with the vertical rack 32. The vertical rack 32 is displaced up and down following the up-and-down displacement of the regulating plate cam 31 accompanying the vertical movement of the slide 5. And Aru.
[0019]
In the figure, W denotes a work such as a panel, and the same parts as those in FIG.
[0020]
During normal operation, the feeding operation of the feed bar 10 is performed in accordance with the vertical movement of the slide 5. At this time, in the interference preventing mechanism 28, the pressing rack bar 37 is pressed against the interference preventing plate cam 27 via the cam follower 36 by the pressing force of the pressing cylinder 35, so that when the slide 5 moves up and down, the pressing rack The bar 37 repeatedly moves in the direction of the press line L, and this moving force is transmitted to the interference preventing rack bar 38 via the power transmission gears 39, 40, 41, so that the interference preventing rack bar 38 also has the press line L. Repeatedly moving back and forth in the direction, the feed pin bar and the feed rack bar 18 of the feed pinion / rack mechanism 20 giving the feed operation to the feed bar 10 are kept following the micro clearance C while being followed.
[0021]
On the other hand, in the stopper mechanism 33, the pressing rack bar 44 is pressed against the regulating plate cam 31 via the cam follower 43 by the pressing force of the pressing cylinder 42, so that the pressing rack bar 44 moves when the slide 5 moves up and down. Is repeatedly moved in the direction of the press line L, and this moving force is transmitted to the vertical rack 32 via the power transmission gears 45 and 46, whereby the vertical rack 32 is moved up and down as the slide 5 moves up and down.
[0022]
During the above operation, if an abnormality occurs in the feed servo motor 14 and the feed operation of the feed bar 10 is distorted, the cross bar 13 may interfere with the upper and lower molds 29 and 30. In this case, the interference preventing rack bar 38 of the interference preventing mechanism 28 is moved to the upstream side in the press line L direction as the slide 5 is lowered. 38 pushes the end face of the feed rack bar 18 and forcibly pushes the feed bar 10 back to the upstream side of the press line L. Therefore, the cross bar 13 is interfered with the upper and lower molds 29 and 30. It can be forcibly paid out to the position where it does not. At this time, the vertical rack 32 is lowered by the operation of the stopper mechanism 33 as described above, and the lower end thereof is positioned so as to overlap the outside of the feed bar 10, so that the feed bar 10 pushed back to the upstream side. The abutment piece 34 comes into contact with the lower end portion of the vertical rack 32, so that the runaway to the upstream side of the feed bar 10 is suppressed.
[0023]
Therefore, even if the vertical movement of the slide 5 and the raising / lowering of the cross bar 13 are continued, the interference between the upper and lower molds 29 and 30 and the cross bar 13 can be avoided. It is possible to prevent damage to the crossbar 13 and the like.
[0024]
Next, FIG. 2 shows a modification of the interference prevention mechanism 28 according to another embodiment of the present invention. The pressing rack bar 37 and the interference prevention rack bar 38 are both arranged with the rack surface facing upward. In addition, the power transmission gears 40 and 41 arranged coaxially are engaged with the rack bars 37 and 38. The other parts have the same configuration as that shown in FIG.
[0025]
Even if the interference prevention mechanism 28 as shown in FIG. 2 is employed, the same effects as those of the above-described embodiment can be obtained.
[0026]
Next, FIGS. 3A and 3B show still another embodiment of the present invention corresponding to FIGS. 1A and 1B, and the interference prevention mechanism 28 shown in FIGS. The interference prevention rack bar 38 is arranged on the upstream side of the feed rack bar 18 so that a minute clearance C is formed between the upstream end surface of the feed rack bar 18 and the same structure as in FIG. It is.
[0027]
FIG. 4 shows still another embodiment of the present invention corresponding to FIG. 2. In the same structure as the interference prevention mechanism 28 shown in FIG. 2, the interference prevention rack bar 38 is replaced with a feed rack bar. 18 is arranged so that a minute clearance C is formed between the feed rack bar 18 and the upstream end surface of the feed rack bar 18, and the rack surface of the pressing rack bar 37 faces downward, and the pressing rack bar The power transmission gears 40 and 41 are meshed between 37 and the interference preventing rack bar 38.
[0028]
As shown in FIGS. 3A and 3B and FIG. 4, when an abnormality occurs in the feed servo motor 14 and the conveyance operation of the feed bar 10 is distorted, the feed bar 10 is moved in the press line L direction. It is possible to pay out the cross bar 13 by pushing it downstream. That is, while the molds 29 and 30 are closed in the middle of the slide 5 being lowered, the cross bar 13 can be reliably held at the standby position as an intermediate space between the molds arranged in the press line L direction.
[0029]
The present invention is not limited only to the above-described embodiment. For example, as the stopper mechanism 33, the rack surface of the pressing rack bar 44 faces upward and the rack surface of the vertical rack 32 faces downstream. In addition, a link mechanism or the like may be adopted as the interference prevention mechanism 28, and an interference prevention plate cam 27 is installed on the slide 5 as shown by a two-dot chain line in FIG. If supported by the height adjusting device 47, the height of the slide 5 is adjusted when the workpiece W has a different mold height. In such a case, the height position of the interference preventing plate cam 27 is adjusted. It goes without saying that the adjustment can be easily performed and various modifications can be made without departing from the scope of the present invention.
[0030]
【The invention's effect】
As described above, according to the cross bar interference preventing device for a transfer press of the present invention, the following excellent effects are exhibited.
(1) A feed rack bar comprising a feed rack bar and a feed pinion, which is attached to and integrally attached to the end of the feed bar on the upstream side in the press line direction in parallel with the feed bar · comprises a rack mechanism, via the feed pinion rack mechanism by a servo motor for feed as given transport operation of the press line direction to the feed bar, to the feed bar, the bar having a workpiece grasper so as to correspond to the arrangement interval of the die is supported so as to be perpendicular to the press line, a press line perpendicular upstream outer wall surface of the且Tsusu ride, projecting to the upstream side of the press line direction towards from bottom to top The interference prevention plate cam is attached, and the interference prevention plate is further interposed between the interference prevention plate cam and the feed rack bar. Since the falling displacement arm is a structure obtained by interposing an interference prevention mechanism to move the feed bar to press line direction through the feed rack bar, even when an abnormality occurs in the conveying operation of the feed bar, With the interference prevention mechanism, the feed bar can be pushed back upstream or downstream in the press line direction, and the cross bar can be forced out to a position where it does not interfere with the mold. It is possible to prevent damage accidents.
(2) The interference prevention mechanism consists of a pressing rack bar that feeds the cam follower at the end against the interference prevention plate cam from the upstream side to the downstream side of the press line by the pressing force of the pressing cylinder, and the feed rack bar. An interference preventing rack bar disposed so that a minute clearance is formed between the upstream end surface and the downstream end surface of the press line , and the power interposed between the interference preventing rack bar and the pressing rack bar. With the configuration including the transmission gear, it is possible to perform a follow-up operation while maintaining a minute clearance between the interference prevention rack bar and the feed rack bar during normal operation.
(3) A restricting plate cam is mounted on the downstream outer wall surface perpendicular to the slide press line so as to protrude from the bottom to the downstream in the press line direction, and the restricting plate cam is moved downward. A stopper mechanism is provided to restrict the movement of the feed bar in the press line direction by lowering the vertical rack and bringing the lower end of the vertical rack into contact with a locking piece fixed to the required position of the feed bar. With this configuration, since the position when the feed bar is pushed back can be regulated by the vertical rack, it is possible to prevent the feed bar from running out of control and jumping out of the machine when pushed back.
(4) The stopper mechanism includes a pressing rack bar that presses the cam follower at the tip against the regulating plate cam from the downstream side of the press line to the upstream side by the pressing force of the pressing cylinder, and the rack bar and the vertical rack. And a power transmission gear that transmits the power so that the vertical rack is displaced downward by the downward displacement of the restriction plate cam . Since the vertical rack can be raised and lowered accurately in accordance with the up and down movement, there is no hindrance to the feeding operation of the feed bar.
[Brief description of the drawings]
1A and 1B show an embodiment of a crossbar interference prevention device for a transfer press according to the present invention, in which FIG. 1A is a partial schematic side view, and FIG. 1B is a partial schematic plan view.
FIG. 2 is a schematic view of an interference prevention mechanism showing another embodiment of the present invention.
FIGS. 3A and 3B show still another embodiment of the present invention corresponding to FIGS. 1A and 1B, wherein FIG. 3A is a partial schematic side view, and FIG. 3B is a partial schematic plan view.
FIG. 4 is a schematic diagram of an interference prevention mechanism showing still another embodiment of the present invention corresponding to FIG.
FIG. 5 is an overall schematic diagram showing an example of a servo motor drive type transfer press.
[Explanation of symbols]
5 Slide 10 Feed bar 12 Work gripper 13 Cross bar 14 Feed servo motor 16 Feed pinion 18 Feed rack bar 20 Feed pinion rack mechanism 27 Interference prevention plate cam 28 Interference prevention mechanism 29 Upper mold 30 Lower mold Mold 31 Restriction plate cam 32 Vertical rack 33 Stopper mechanism 34 Locking piece 35 Pushing cylinder 36 Cam follower 37 Pushing rack bar 38 Interference prevention rack bar 39, 40, 41 Power transmission gear 42 Pushing cylinder 43 Cam follower 44 Pushing rack Bar L Press line

Claims (4)

A feed pinion rack mechanism comprising a feed rack bar and a feed pinion, wherein the feed rack bar is disposed in parallel with the feed bar at the end on the upstream side in the press line direction of the feed bar and is integrally attached. the provided, via the feed pinion rack mechanism by a servo motor for feed as given transport operation of the press line direction to the feed bar, to the feed bar, the bar having a workpiece grasper mold to correspond to the arrangement interval is supported so as to be perpendicular to the press line, a press line perpendicular upstream outer wall surface of the且Tsusu ride, and so protrude to the upstream side of the press line direction towards from bottom to top An interference prevention plate cam is attached, and the interference prevention plate cover is further interposed between the interference prevention plate cam and the feed rack bar. Descending displacement crossbar interference preventing system for a transfer press, characterized in that it has a structure obtained by interposing an interference prevention mechanism so as to move the feed bar to press line direction via the feed rack bar. A feed pinion rack mechanism comprising a feed rack bar and a feed pinion, wherein the feed rack bar is disposed in parallel with the feed bar at the end on the upstream side in the press line direction of the feed bar and is integrally attached. And a feed servo motor through the feed pinion / rack mechanism to feed the feed bar in the press line direction, and a cross bar equipped with a workpiece gripper is attached to the feed bar. Interference prevention that is supported so as to be orthogonal to the press line according to the arrangement interval and that it protrudes from the bottom to the upstream in the press line direction on the upstream outer wall surface perpendicular to the press line of the slide. Install the use plate cam, further, between the interference preventing plate cam and the feed rack bar, the pressing cylinder And pressing rack bar was pressed against the direction of the downstream side of the cam follower tip interference preventing plate cam from the upstream side of the press line by the biasing force, the feed rack bar of the press line upstream or downstream end face of the interference and anti-rack bar that is disposed so small clearance is formed between, Ri Do and a power transmission gear is interposed between the interference preventing rack bar and the pressing rack bar, for preventing interference An apparatus for preventing crossbar interference in a transfer press, characterized in that an interference prevention mechanism for converting a downward displacement of a plate cam into a displacement in the press line direction is interposed . A regulating plate cam that protrudes from the bottom to the upstream side in the press line direction is attached to the downstream outer wall surface perpendicular to the slide press line, and the vertical rack is moved by the downward displacement of the regulating plate cam. And a stopper mechanism for restricting the movement of the feed bar in the press line direction by bringing the lower end of the vertical rack into contact with a locking piece fixed at a required position of the feed bar. 3. A crossbar interference preventing device for transfer press according to 1 or 2. The stopper mechanism has a pressing rack bar that presses the cam follower at the end against the regulating plate cam by the pressing force of the pressing cylinder in the direction from the downstream side to the upstream side of the press line , and between the rack bar and the vertical rack. 4. A crossbar interference preventing device for a transfer press according to claim 3, further comprising a power transmission gear which is interposed to transmit power so that the vertical rack is displaced downward by the downward displacement of the regulating plate cam. .

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