JP4781881B2 - Transfer bar feed bar drive device - Google Patents

Description

  The present invention relates to a feed bar driving device in a transfer press used for sheet metal processing, for example.

In the transfer press, a feed bar driving device for feeding a workpiece is used.
As this type of conventional apparatus, the feed bar is movable in the vertical and horizontal directions, and on the other hand, it is provided with a feed carrier that is connected so that the movement in the front-rear direction is restricted, and a feed unit that moves the feed carrier back and forth. Is known.
The feed unit of this apparatus includes a transmission mechanism that converts the rotary motion of the rotary motor and the output shaft of the motor into a reciprocating motion and transmits it to the feed carrier.

In addition, as a specific apparatus, the transfer feeder apparatus etc. which were disclosed by patent document 1, etc. are known, for example.
Also in the apparatus according to Patent Document 1, a considerable heavy object including a feed carrier is reciprocated.

Japanese Utility Model Publication No. 58-66045

However, the conventional apparatus is configured to transmit the driving force to the feed bar via the feed carrier, and the feed bar itself has a considerable weight. When the inertia weight of the feed carrier is added, the feed drive A considerable load is applied to the motor.
In addition, there is always a backlash in the connecting portion between the parts constituting the power transmission mechanism, and the power transmission efficiency deteriorates due to the backlash, and the drive motor and the power transmission mechanism have to be enlarged.
Furthermore, since the conventional apparatus has a large number of parts, there are problems such as a large number of parts processing and assembly processes, and complicated maintenance and inspection.
Therefore, the applicant considered a method that does not use mechanical means such as a rack and pinion mechanism or a ball screw mechanism, for example, a method that uses a linear motor.
However, in the case of a linear motor, a special contrivance is required because an extremely strong magnetic force acts between the coil and the magnet.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a transfer press feed bar driving device capable of realizing a high-speed operation while ensuring a smooth operation of the device while simplifying and compacting the device configuration.

That is, the present invention relates to (1) a feed bar drive device for a transfer press provided with a clamp / lift device that supports and moves a feed bar arranged in the transfer direction at a suitable position in the transfer press at two locations in the feed direction . The clamp / lift device has a support base that supports and feeds the feed bar through a linear guide in the workpiece feed direction, and a linear motor is interposed between the feed bar and the support base. The linear motor is configured to drive the feed bar in the workpiece feeding direction, and the supporting base is formed of a rectangular bracket having side and upper brackets surrounding the rectangular feed bar, and the linear motor The fixed part is provided on both inner sides of the side bracket, and the moving part is provided on both side surfaces of the feed bar. To, the upper surface of the feed bar guide rails, and then with the linear guide provided with a guide block to the lower surface of the upper bracket, at least one of said clamp lift device, and supports the feed bar from above It exists in the feed bar drive device of a transfer press.

Further, the present invention is (2), the fixed portion of the linear motor is constituted by an electromagnetic coil, the movable portion lies in the feed bar driving apparatus for a transfer press of configured above (1), wherein the magnet piece.

The present invention also relates to (3), consists in the feed bar driving apparatus for a transfer press (1) above, further comprising a feed bar position detecting means for detecting the amount of movement engages with the feed bar side.

In the present invention, ( 4 ), the feed bar position detecting means includes a rack attached to the feed bar side and formed to protrude sideward, and a pinion supported on the support base side and engaged with the rack. And a feed bar driving device for a transfer press described in ( 3 ) above, including an encoder mounted on the rotation shaft of the pinion.

In addition, as long as the objective of this invention is met, the structure which combined the said (1) or ( 4 ) suitably can also be employ | adopted.

According to the present invention, since it is not necessary to convert the rotational motion into a reciprocating linear motion, the number of parts can be greatly reduced.
As a result, the apparatus can be simplified and the number of assembling steps can be reduced.
Further, it is not necessary to move the feed bar via the feed carrier, the inertia weight of the movable part is reduced, and the speed of the feed bar can be increased.
In addition, the capacity of each drive motor can be substantially reduced, thereby realizing energy saving.

Moreover, since there is no bulky feed unit, the entire apparatus can be made small, so that the work space can be greatly increased.
Thereby, workability is greatly improved.

Further, when the position of the feed bar is detected, the position of the feed bar can be controlled remarkably accurately by taking out a signal directly from the rack attached to the feed bar.
Furthermore, since the coil of the linear motor is arranged at the fixed portion, there is no risk of breakage or the like by fixing the power wiring, and high safety can be ensured.
Further, by providing the pair of linear motors 29 in the horizontal direction, only the weight below the feed bar 10 is applied to the guide block 31 and the guide rail 30, and the influence of the strong magnetizing force of the linear motor 29 is avoided. Can do.

  Hereinafter, preferred embodiments of a feed bar drive device of a transfer press according to the present invention will be described with reference to the drawings.

FIG. 1 schematically shows an example of the overall configuration of a feed bar driving apparatus according to an embodiment of the present invention.
A press machine (not shown) is disposed in the inner region of the upright 1, and a pair of feed bars 10 are disposed so as to sandwich the mold from both the left and right sides.
As will be described later, the feed bar 10 is driven in the workpiece conveyance direction (front-rear direction X), the clamping direction (left-right direction Y), and the lift direction (up-down direction Z) by the drive device of the present invention.

In this example, the feed bar 10 is supported by the clamp / lift device 11 at two appropriate positions in the front-rear direction, and can be moved in the left-right direction and the vertical direction by the clamp-lift device 11.
In this case, the clamp / lift device 11A on the front side supports the feed bar 10 from the lower side, and the clamp / lift device 11B on the rear side supports the feed bar 10 from the upper side.
The clamp / lift device 11A and the clamp / lift device 11B support the feed bar 10 from the lower side and the latter from the upper side. 10 and the support base 12 are slightly different in structure, but other than that, it is substantially the same including the drive mechanism.

  That is, the clamp / lift device 11A in FIG. 1 has a sliding relationship with the guide rail 30A on the feed bar side and the guide block 31A on the support base side (see FIG. 2), but those of the clamp / lift device 11B. Is different (see FIG. 3).

FIG. 2 is a diagram illustrating a specific configuration example of the clamp / lift device 11 (11A).
In the figure, the clamp / lift device 11A has a support base 12 that supports and guides the feed bar 10 so as to be movable in the work feed direction. The support base 12 is supported by a clamp carrier 13.
The clamp carrier 13 has a lift drive rack shaft 14 that moves up and down, and supports the carrier base 12 at its tip.
A lift guide 15 is provided in parallel with the lift drive rack shaft 14, and the carrier base 12 is driven up and down by these.

The clamp carrier 13 is disposed below the feed bars 10 so as to move the lift drive rack shaft 14 up and down by rotation of a pinion 16 that meshes with the lift drive rack shaft 14.
The pinion 16 is rotationally driven by a drive shaft 17. In this case, the drive shaft 17 is configured as a spline shaft, for example.
Both of them can move relative to each other in the axial direction of the drive shaft 17 (Y direction) by spline engagement.

The drive shaft 17 is coupled to a reduction gear 20 driven by a lift servomotor 19 via a gear 18 (for example, a bevel gear).
By operating the lift servo motor 19, the drive shaft 17 can be rotated via the speed reducer 20 and the gear 18, and the lift drive rack shaft 14 can be moved up and down via the pinion 16 described above.
In addition, a pinion 23 that meshes with another rack 22 is attached to an appropriate position in the middle of the output shaft 21 of the speed reducer 20, and the rack 22 is connected to the lift balancer 24.
The lift balancer 24 can balance the load when the feed bar 10 is raised and lowered.

The clamp carrier 13 is movable in the left-right direction Y, that is, in the direction orthogonal to each feed bar 10.
In this case, the guides 25 arranged along the left-right direction Y support and guide the clamp carrier 13.
Clamp driving pinions 26 are arranged at the center of the two left and right clamp carriers 13, and upper and lower clamp driving racks 27 extending from the respective clamp carriers 13 are engaged with the clamp driving pinions 26.
The clamp drive pinion 26 is rotationally driven by a clamp servomotor 28.
As the clamp servo motor 28 rotates, the two left and right clamp carriers 13 move symmetrically, that is, approach or separate from each other.

  In the feed bar driving device, a linear motor described below is arranged between the feed bar 10 and the support base 12, and the feed bar 10 is driven by the linear motor.

Here, FIG. 3 schematically shows a configuration example around the linear motor 29 from obliquely above.
FIG. 4 schematically shows a configuration example around the linear motor 29 from obliquely below.
The linear motor 29 is configured by using the clamp / lift device 11 or accompanying form.

3 and 4 show an example of a linear motor 29 (see FIG. 1) provided on the side of the clamp / lift device 11B on the rear side that supports the feed bar 10 from above.
Therefore, it differs slightly from the clamp / lift device 11A on the front side shown in FIG. 2 in that the arrangement positions of the feed bar 10 and the support base 12 are turned upside down, and other than that, substantially including the drive mechanism. The same.

The feed bar 10 is hollow and formed in a rectangular shape, and a guide rail 30 is provided on the upper surface thereof.
The support base 12 includes bracket portions 32 (an upper bracket 32A, a left side bracket 32B, a right side bracket 32B, and a lower bracket 32C) on both the left and right sides and below, and is formed so as to surround the periphery of the feed bar 10. Has been.

In addition, the bracket part in the lower part may be provided with a transfer plate at regular intervals as shown in the figure, or may be a flat plate.
The support base 12 is finally supported from above by the clamp / lift device 11B via the lift driving rack shaft 14 and the lift guide 15 of the clamp carrier 13.
A guide block 31 is provided on the lower surface of the upper bracket 32A of the carrier base 12, and the guide rail 30 of the feed bar 10 constitutes a so-called linear guide.
Thereby, the guide rail 30 of the feed bar 10 is guided and slid by the guide block 31 of the upper bracket 32A, and the feed bar 10 moves smoothly in the workpiece conveyance direction (front-rear direction X).
That is, the feed bar 10 is supported by the guide block 31 and slides in a direction perpendicular to the drawing sheet.

A fixed portion of the linear motor 29 is provided on the carrier base 12 side, and a moving portion of the linear motor 29 is provided on the feed bar 10 side.
In this case, fixing portions are disposed on both inner sides of the left and right side bracket portions 32B, 32B of the support base 12.
The fixed portion of the linear motor 29 is configured by electromagnetic coils 33 arranged in a row at a predetermined pitch along the front-rear direction X.
On the other hand, the moving part is provided on both side surfaces of the feed bar 10 and is constituted by a plurality of magnet pieces 34 arranged in a line at a predetermined pitch along the front-rear direction X.
By providing the fixed part of the linear motor 29 on the carrier base side, the movement of the wiring for the electromagnetic coil can be avoided.

Here, in the present invention, as described above, the feed bar 10 is supported so as to be movable upward, and a driving force is given by the linear motor 29 on the side surface.
As described above, the support base 12 includes the bracket portions 32 on both the left and right sides and below, and the electromagnetic coil 33 as a fixing portion is disposed on the left side bracket, and the moving portion is provided on the left side surface of the feed bar 10. A certain magnet piece 34 is arranged.
Similarly, an electromagnetic coil 33 that is a fixed portion is also arranged on the right side bracket, and a magnet piece 34 that is a moving portion is also arranged on the right side surface of the feed bar 10.

Thus, by providing the pair of linear motors 29 in the horizontal direction, the force attracted in both directions is canceled and no load is applied, and no mechanical load is applied to the guide block 31 and the guide rail 30.
As a result, only the weight (workpiece or the like) below the feed bar 10 is applied to the guide block 31 and the guide rail 30 and is not affected by the strong magnetizing force of the linear motor 29.

Incidentally, when the linear motor 29 is provided above, an extremely large frictional force is generated between the guide block 31 and the guide rail 30 due to the magnetizing force, and the mechanical load between the guide block 31 and the guide rail 30 is severe. Become.
Furthermore, in the present invention, since the support base 12 is provided with bracket portions 32 on both the left and right sides and below and is formed so as to surround the periphery of the feed bar 10, the entire bracket has a strong structure and the linear motor 29. It can sufficiently withstand the magnetizing action.

On the other hand, this apparatus has a feed bar position detecting means that engages with the moving portion of the linear motor 29 and detects the amount of movement.
The feed bar position detecting means is attached to a rack 35 attached to the feed bar 10 side, an idle gear or pinion 36 that is supported on the carrying base 12 side and engages with the rack 35, and a rotation shaft of the pinion 36. Encoder 37.

In order to dispose a belt conveyor for unloading in the workpiece unloading area (that is, on the side of the clamp / lift device on the rear side), it is necessary to secure a space as much as possible below the support base 12 and the feed bar 10.
Therefore, it is preferable that the rack 35 extends directly outward (that is, laterally) from the feed bar 10.

  The linear motor 29 can be provided only on the rear clamp / lift device 11B, or on both the front clamp / lift device 11A side and the clamp / lift device 11B side.

Further, FIG. 6 is a control block diagram in the feed bar driving device in the embodiment of the present invention.
The lift servo motor 19 (Z axis (11A), Z axis (11B)) and clamp servo motor 28 (Y axis (11A), Y axis (11B)) of the clamp / lift device side and the clamp / lift device 11B are The controller is controlled to operate at a predetermined speed and a predetermined timing.

Further, the linear motor 29 is driven and controlled by sending a predetermined operation signal to the electromagnetic coil 33 (fixed side) of the linear motor 29 by the controller.
The feed bar 10 is moved along the front-rear direction X (feed axis) by the operation of the linear motor 29. At this time, the pinion 36 supported on the support base 12 side is provided via the rack 35 attached to the feed bar 10 side. Rotate.
The rotation of the pinion 36 operates the encoder 37, and the output signal of the encoder 37 is fed back to the controller, whereby the position of the feed bar 10 in the front-rear direction X can be accurately detected.

  In the feed bar driving apparatus according to the present invention having the above-described configuration, the feed bar driving apparatus operates in synchronization with or in synchronization with the operation of the press machine.

  In this case, as shown in FIG. 1, the feed bar 10 positioned at the base point O first approaches each other via the rack 22 and the two left and right clamp carriers 13 when the servo motor 28 for clamping is operated.

When the feed bar 10 approaches to a predetermined position, the work holding means (not shown) mounted on the feed bar 10 holds the work (not shown).
Thereafter, the lift servomotor 19 is operated, and as a result, the drive shaft 17 is rotated, and the lift drive rack shaft 14, and hence the carrying base 12, is raised via the pinion 16.
This raises the feed bar 10 to a predetermined height position.

Next, when the electromagnetic coil 33 of the linear motor 29 is energized, the moving magnet piece 34, and thus the feed bar 10 coupled thereto, is driven in the workpiece conveying direction (front-rear direction X).
In this case, the movement speed and movement amount of the feed bar 10, that is, the workpiece conveyance stroke is set and controlled by the controller.

As a result, the work held by the work holding means can be transported by a predetermined distance. At this time, the pinion 36 is rotated by the rack 35 that moves together with the feed bar 10 (see FIG. 3).
The output signal of the encoder 37 obtained by this rotation is fed back to the controller, and the position of the feed bar 10 in the workpiece conveyance direction (front-rear direction X) can be grasped accurately and substantially in real time.

The feed bar 10 is further lowered by operating the lift servo motor 19 in the reverse direction.
At this time, the work held via the work holding means is set in the die of the press machine.
Next, the clamping servo motor 28 operates in the reverse direction to the above, so that the two left and right clamp carriers 13 and thus the pair of feed bars 10 are separated from each other, and the workpiece holding means is detached from the workpiece.

The linear motor 29 is energized again. In this case, the linear motor 29 is driven in the opposite direction to that described above, whereby the feed bar 10 is driven in the opposite direction to the workpiece transfer direction and returns to the base point O.
In this way, one cycle of the feed bar driving device is completed, but is repeated as many times as necessary.

As described above, the operation of the feed bar driving device has been outlined. However, according to the present invention, first, it is not necessary to convert the rotational motion into the reciprocating linear motion in order to drive the feed bar 10 (work transfer direction).
Since it is not necessary to provide a motion conversion mechanism for that purpose, the number of parts can be greatly reduced, thereby simplifying the apparatus and reducing the number of assembling steps.

In addition, it is not necessary to move the feed bar through a feed carrier that is a heavy load as in the prior art, and the inertia weight of the movable part is reduced and the feed bar 10 can be speeded up.
Incidentally, conventionally, as shown by the one-dot chain line in FIG.
Furthermore, in the present invention, the capacity of each drive motor can be substantially reduced, thereby realizing energy saving.

Moreover, since there is no bulky feed unit, the entire apparatus can be made small, and the work space can be greatly increased.
This further improves workability.

Furthermore, when the position of the feed bar 10 is detected, the position control of the feed bar 10 can be performed extremely accurately by taking out a signal directly from the rack 35 attached to the feed bar 10 side.
In addition, since the rack is formed so as to protrude sideways from the feed bar side, it is possible to separate the space below the feed bar and the support base, and to sufficiently dispose a conveyor for carrying out.
Further, since the electromagnetic coil 33 of the linear motor 29 is disposed in the fixed portion, the power wiring is stable without moving.

Since the wiring is thus fixed at a predetermined position, there is no danger of breakage or the like, and high safety can be ensured.
Since the clamp / lift device 11B supports the feed bar 10 from the upper side, it is possible to secure a space in which a conveyor to be carried out downward is arranged.
Further, by providing a pair of linear motors 29 in the horizontal direction, the guide block 31 and the guide rail 30 are only affected by the weight of the lower portion from the feed bar 10 and are not affected by the strong magnetizing force of the linear motor 29. Absent.

As mentioned above, although this invention was demonstrated with embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention.
For example, the example in which the linear motor is configured on the side surface of the feed bar 10 has been described. However, it is naturally possible to arrange the linear motor on the upper and lower surfaces or the like if a part space or the like is allowed.
Further, the electromagnetic coil 33 is preferably provided on the fixed portion as described above, but in principle, it may be provided on the moving side.
Further, the vertical positional relationship between the support base and the feed bar in the clamp / lift device can be different between the carry-in side and the carry-out side, or the same.

  The present invention relates to a feed bar drive device for a transfer press used for sheet metal processing or the like. However, as long as the principle is applied, the present invention can also be applied to workpiece feeding of other manufacturing apparatuses.

It is a perspective view which shows the whole schematic structure of the feed bar drive device which concerns on embodiment of this invention. It is a perspective view which shows the specific structural example of the clamp lift apparatus in embodiment of this invention. It is a perspective view which shows the structural example around the linear motor in embodiment of this invention. It is a perspective view which shows the structural example around the linear motor in embodiment of this invention. It is sectional drawing around the linear motor in embodiment of this invention. It is a control block diagram of the feed bar drive device in the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Feed bar 11 (11A, 11B) Clamp / lift device 12 Support base 13 Clamp carrier 14 Lift drive rack shaft 15 Lift guide 16 Pinion 17 Drive shaft 19 Lift servo motor 20 Reducer 21 Output shaft 22 Rack 23 Pinion 24 Lift Balancer 25 Guide 26 Clamp drive pinion 27 Clamp drive rack 28 Clamp servo motor 29 Linear motor 30, 30A Guide rail 31, 31A Guide block 32 Bracket part 32A Upper bracket 32B Side bracket 32C Lower bracket 33 Electromagnetic coil 34 Magnet piece 35 Rack 36 Pinion 37 Encoder

Claims (4)

In a feed bar driving device of a transfer press provided with a clamp / lift device that supports and moves a feed bar arranged at a suitable position in the transfer press in the work feed direction,
The clamp / lift device has a support base that supports and guides the feed bar movably through a linear guide in the workpiece feeding direction,
A linear motor is arranged between the feed bar and the supporting base, and the linear motor drives the feed bar in the workpiece feeding direction .
The carrying base comprises a rectangular bracket having side and upper brackets surrounding a rectangular feed bar ,
The fixed part of the linear motor is provided on both inner sides of the side bracket, the moving part is provided on both side surfaces of the feed bar, a guide rail is provided on the upper surface of the feed bar, and a guide block is provided on the lower surface of the upper bracket. The linear guide,
A feed bar drive device for a transfer press , wherein at least one of the clamp / lift devices supports the feed bar from above .   2. The feed bar drive device of a transfer press according to claim 1, wherein the fixed part of the linear motor is constituted by an electromagnetic coil, and the moving part is constituted by a magnet piece.   2. The feed bar drive device of a transfer press according to claim 1, further comprising feed bar position detecting means for engaging with the feed bar side and detecting a moving amount thereof.   The feed bar position detecting means is mounted on a rack attached to the feed bar side and projecting sideways, a pinion supported on the carrying base side and engaged with the rack, and a rotation shaft of the pinion. The transfer bar feed bar driving device according to claim 3, further comprising an encoder.

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