JPH10180378A - Lift and clamp device for transfer feeder - Google Patents

Abstract

(57) [Summary] (With correction) [Problem] High-precision conveyance was not possible due to the effects of backlash and the like. In a transfer feeder configured to carry a work, a lift / clamp drive unit is moved up and down via a plurality of lift ball screw shafts that are rotated forward and reverse by a lift motor that is a servomotor. Lift base 10b and roller 1 at the lower end
0f, and is moved via a clamp carrier 11a in a clamp direction orthogonal to the workpiece transfer direction A.
A pair of lift rods 10e for supporting the lower part from below, a screw part screwed to the clamp carrier 11a is formed into a left-right reverse screw, and a clamp motor 1 comprising a servomotor.
7, and is constituted by the lift rod 10e.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a lift and clamp device for a transfer feeder capable of transporting with high precision.

[0002]

2. Description of the Related Art Conventionally, in a transfer press having a plurality of processing stations in a press body, a transfer feeder which operates two-dimensionally or three-dimensionally is provided in the press body, and a work is processed by the transfer feeder. It is transported to the station sequentially.

A transfer feeder of this type is disclosed, for example, in Japanese Patent Publication No.
No. 6931, Japanese Utility Model Laid-Open No. 6-86828 and the like are already known. All of the transfer feeders disclosed in these publications have feed driving means,
It has a lift drive unit and a clamp drive unit, and is configured to transfer a work by driving a transfer bar in a three-dimensional direction by these drive units. The transfer feeder disclosed in Japanese Patent Publication No. 6-18679. Then, adopt a rack and a pinion for each drive means,
By rotating the pinion by a servomotor, the transfer bar is driven in a three-dimensional direction via a rack that meshes with the pinion.

In Japanese Utility Model Laid-Open Publication No. Sho 62-6931, a lift screw is used as a lift drive means to drive a transfer bar in a lift direction by screw feed, and a feed drive means and a clamp drive means are provided with a rack and a pinion. The rack and the pinion drive the transfer bar in the feed and lift directions.

In Japanese Utility Model Laid-Open Publication No. Hei 6-86828, a ball driver is provided on a feed driving means and a lift driving means to drive the transfer bar in the feed and lift directions by screw feed, and the clamping direction is by a rack and a pinion. It is driving.

[0006]

However, in the case of using a rack and a pinion for the driving means, since the rack and the pinion have a backlash, the transfer bar generates backlash during the transfer of the work, and the transfer is performed. Poor positioning accuracy at the time, especially when used in forging presses that require high positioning accuracy at the time of loading, such as cold forging, can cause problems such as the inability to obtain high-accuracy products and the occurrence of defective products. is there.

In Japanese Utility Model Laid-Open No. 62-6931,
By performing the drive in the lift direction by screw feed, the influence of the backlash on the lift direction has been eliminated, but since the drive in the feed direction is performed by a rack and a pinion, There is a similar problem.

On the other hand, in Japanese Unexamined Utility Model Publication No. 6-86828, the driving in the feed direction and the lift direction is performed by screw feed, so that the feed direction and the lift direction are not affected by the backlash. High transport is possible.

However, in Japanese Utility Model Laid-Open Publication No. Hei 6-86828, a feed motor is installed in a drive box provided with a clamp driving means, and the rotation of the feed motor is controlled via a spline shaft provided in the drive box and inside a transfer bar. Is transmitted to the ball screw shaft of the motor, there are the following problems.

[0010] That is, the clamp driving means employing the rack and the pinion employs an oil bath system in this portion to supply oil to the rack and the pinion. For this reason, for example, if the drive box laid out at the lower part of the press body is turned upside down and is installed at the upper part of the press body, oil leakage occurs or the return pipe cannot be processed, so that it is difficult to change the layout. There is a defect such as.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and provides a lift / clamping device for a transfer feeder which is capable of high-accuracy conveyance and whose layout can be easily changed at a low cost with a simple structure. It is intended to do so.

[0012]

In order to achieve the above object, according to the first aspect of the present invention, a pair of transfer bars arranged side by side in a work transfer direction are installed on an upstream side and a downstream side of a press body. In a transfer feeder that is driven in three-dimensional directions by a lift and a clamp drive unit that has been set and a feed drive unit that is installed on a pair of an upstream side and a downstream side to carry a work, the lift clamp drive unit is A lift base that is moved up and down through a plurality of lift ball screw shafts that are rotated forward and reverse by a lift motor composed of a servo motor, and a work transfer direction that is supported on the lower end side by rollers and the clamp base and is supported by a clamp carrier. The transfer bar is moved in the clamp direction orthogonal to A plurality of pairs of lift rods to be supported and screw portions screwed into the clamp carrier are formed into left and right reverse screws, and are rotated forward and reverse by a clamp motor composed of a servomotor to drive the lift rods in the contact and separation directions. It is composed of a clamp ball screw shaft.

According to the above configuration, even if the lift and the clamp drive unit are installed upside down, oil leakage does not occur, so that it is possible to install not only below the transfer bar but also above the transfer bar. Since the layout is not restricted, the drive units can be shared.

Further, since the lift base and the clamp carrier are driven by the screw feed by the lift ball screw shaft or the clamp ball screw shaft, no backlash is generated, thereby improving the positioning accuracy at the time of transferring the work. In addition, by adopting a cold forging press or the like that requires positioning accuracy at the time of carrying in a work, it is possible to perform processing with high accuracy, and it is possible to significantly reduce the occurrence of defective products.

Further, as compared with a system in which a lift base or a clamp carrier is driven by a rack and a pinion, the drive system has a simple structure and is easily miniaturized. Since it can be driven by a motor, it is economical, and the entire apparatus can be downsized, so that it can be easily installed in a small space in the press body.

According to a second aspect of the present invention, an endless timing belt interlocks between the lift ball screw shafts and the lift motor, and a tension pulley for tensioning the timing belt and the lift motor are adjusted. A tension adjusting mechanism for adjusting the tension of the timing belt by installing the adjusting plate on a plate and moving and adjusting the adjusting plate is provided.

According to the above configuration, when the tension pulley is moved and adjusted to adjust the tension of the timing belt, the lift motor is also moved in the same direction by the same amount, so that the lift ball screw shaft is not rotated, thereby the timing belt is rotated. Even if the tension is adjusted, it is possible to prevent an error from occurring in the work transfer height (pass line).

According to a third aspect of the present invention, a plurality of rollers are provided at the lower end of each lift rod to contact the upper and lower surfaces of a lift base made of a square pipe, an I-beam, or an H-beam. In addition, one of these rollers is supported on an eccentric shaft, and the eccentric shaft is rotated to apply a roller pressurization.

With the above structure, the vertical play of the lift rod does not occur, so that the transfer bar can be prevented from vibrating in the vertical direction during the lift, and the lift base can be formed of a square pipe, an I-shaped steel, or the like. By using the H-section steel, even if the distance between the upper and lower surfaces of the lift base changes due to manufacturing errors, the lift base is elastically deformed and absorbs it. As a result, there is no fear that the roller is damaged or seized due to overload.

Further, by applying a pressure to the rollers, there is no gap between the rollers and the lift base during the movement, so that each of the rollers can be reliably rotated, and the rollers do not have uneven wear. Roller life is also greatly improved.

[0021]

Embodiments of the present invention will be described in detail with reference to the drawings. 1 is a side view of a press provided with a transfer feeder, FIG. 2 is a front view of the same, FIG. 3 is a plan view of the same, and FIGS.

In these figures, reference numeral 1 denotes a press body, on which a bolster 2 is fixed on a bed 1a, and a lower mold 3b of a mold 3 is mounted on the bolster 2. A slide 4 that is moved up and down by a slide drive mechanism (not shown) is provided above the bolster 2, and an upper die 3 a of a mold 3 is attached to a lower surface of the slide 4. A work (not shown) is processed between the lower molds 3b.

In the figure, reference numeral 5 denotes a transfer feeder provided in the press body 1 and having a pair of transfer bars 6 arranged in parallel in the work transfer direction A. The lift, clamp drive unit 7 and feed drive unit 8 installed on the upstream and downstream sides drive the lift, clamp and feed in three-dimensional directions.

The lift / clamp drive unit 7 comprises:
It is installed on a support bracket 9 protruding from the side surface of the upright 1b located on the upstream side and the downstream side of the press body 1, and supports both ends of the transfer bar 6 from below. In order to increase the degree of freedom, the transfer bar 6 can be installed upside down and installed above the transfer bar 6 so that the transfer bar 6 is suspended from above.

Lifts provided on the upstream side and the downstream side,
The clamp drive unit 7 has a lift and a clamp box 7a.
a, a lift drive unit 10 and a clamp drive unit 11 are accommodated therein, and a feed drive unit 8 provided on the downstream side has a feed box 8a, and a feed drive unit 12 is provided in the feed box 8a. Is housed.

As will be described later with reference to a layout change pattern, the feed drive unit 8 may of course be installed on the upstream side.

The lift driving means 10 is shown in FIGS.
As shown in the figure, a pair of guide rods 10a are erected in the lift and clamp box 7a in the work transfer direction A, and the intermediate portion of the lift base 10b is interposed between the guide rods 10a via the guide cylinder 10m. It is supported so that it can move up and down freely.

The lift base 10b is formed of a square pipe, an I-shaped steel, an H-shaped steel, or the like, and has a work transfer direction A
The lift and the clamp box 7a are provided horizontally in the clamp box 7a, and both ends are supported from below by a pair of balance cylinders 13 each composed of an air cylinder attached to the lower surface of the lift and the clamp box 7a. A pair of nut members 10c is mounted at positions facing each other with the guide rod 10a therebetween.

A lift ball screw shaft 10d made of a ball screw is screwed into these nut members 10c so as to penetrate vertically. The lift ball screw shaft 10
The lower end of d protrudes downward from the lower surfaces of the lift and clamp box 7a, and the timing pulleys 14a are fixed to the lower ends thereof.
An endless timing belt 14c is wound around a timing pulley 14b attached to a lift motor 16 composed of a servo motor 4a.

The lift motor 16 is provided with an adjusting plate 14 of a tension adjusting mechanism 14 for adjusting the tension of the timing belt 14c.
d. The tension adjusting device 14 is shown in FIG.
As shown in FIG. 3, the adjusting plate 14d has an elongated adjusting plate 14d, and a plurality of long holes 14e are formed in the longitudinal direction of the adjusting plate 14d.

The elongated holes 14e are provided with mounting bolts 14f.
The adjusting plate 14d is mounted on the bottom surface of the lift and clamp box 7a so as to be movable and adjustable by these mounting bolts 14f.
The lift motor 16 is attached to one end of the d. The other end of the adjustment plate 14d has a timing belt 14
tension pulley 14g for tensioning c and adjustment plate 14d
The adjustment screws 14h for moving and adjusting are provided.

At both ends of the lift base 10b, a lower portion of a pair of lift rods 10e is connected to a pair of rollers 10f.
Is supported through. The roller 10f is provided so as to be vertically separated from a roller bracket 10n fixed to the lower end of the lift rod 10e.
0f is in contact with the upper surface of the lift base 10b, and the lower roller 10f is in contact with the lower surface of the lift base 10b.

The lower roller 10f is supported by an eccentric shaft 10g. During assembly, the eccentric shaft 10g is rotated to apply a pressurizing force so as to press the lower roller 10f against the lower surface of the lift base 10b. A vertical play is not generated between the lift base 10b and the lift rod 10, and stoppers 10h are provided at both ends of the lift base 10b to prevent the lift rod 10e from overrunning or falling off. Have been.

Guide rails 10i made of LM guides are laid vertically on opposite sides of each of the lift rods 10e, and these guide rails 10i are attached to a clamp carrier 11a constituting the clamp driving means 11. A bar receiver 10j is fixed to the upper end of each lift rod 10e while being supported vertically slidably on the provided rail receiver 11b.

The bar receivers 10j have a U-shaped cross-sectional shape whose upper surface is open. The bar receivers 10j are fitted from below into guide rails 6a laid on the lower surfaces on both ends of the transfer bar 6. Both ends are supported from below and, at the same time, movement in the feed direction is allowed.

On the other hand, the clamp driving means 11 has a clamp carrier 11a for each lift rod 10e.
Both ends of the clamp carrier 11a are supported via a rail receiver 11d on a pair of guide rails 11c composed of lifts and LM guides laid on the clamp box 7a. The guide rail 11c is laid horizontally in a clamp direction orthogonal to the workpiece transfer direction A, guides the movement of each clamp carrier 11a in the clamp direction, and has a nut member 11f attached to each clamp carrier 11a. A clamp ball screw shaft 11e composed of a ball screw provided on each of the nut members 11f so as to be parallel to each guide rail 11c.
Is screwed.

A left-handed screw and a right-handed screw are formed on the clamp ball screw shaft 11e. Each nut member 11f is screwed into these screws, and the lift ball screw shaft 11e does not interfere with each lift rod 10e. As shown in FIG. 7, a vertically long slot 10j is opened. A lift motor and a clamp motor 17 composed of a servomotor attached to the end face of the clamp box 7a are connected to one end of the clamp ball screw shaft 11e, and the clamp motor 17 rotates the clamp ball screw shaft 11e in the forward and reverse directions. Each of the clamp carriers 11a can be moved in the approaching / separating direction together with the lift rod 10e.

On the other hand, the feed drive means 12 has a feed box 8a removably mounted on the downstream end face of a lift and clamp box 7a installed on the downstream side. As shown, the feed carrier 12a is provided horizontally in a direction orthogonal to the workpiece transfer direction A. A bottom portion of the feed box 8a is inclined substantially in a mountain shape so that a central portion thereof is high, and a guide rail 12c composed of an LM guide is laid on the top along the workpiece transfer direction A. The feed rail is provided on the guide rail 12c. A rail receiver 12d provided at the center of the bottom surface of 12a is slidably supported.

As shown in FIG. 9, the rail receiver 12d is provided at two places separated from each other in the moving direction, and a nut member 12e is attached to the center of the feed carrier 12b. A feed ball screw shaft 12f formed of a ball screw is screwed into the shaft.

Both ends of the feed ball screw shaft 12f are supported by a feed box 8a via bearings 12g so as to be parallel to the guide rails 12c. One of these bearings 12g is provided with a feed ball screw shaft 12f.
A radial thrust bearing capable of receiving a thrust force acting on the feed ball screw shaft 12f is provided at one end of the feed ball screw shaft 12f.
A feed motor 18 composed of a servomotor attached to the downstream end face of the feed motor a is connected to the feed motor 18. The feed motor 18 reciprocates the feed ball screw shaft 12 f so that the feed carrier 12 a can reciprocate in the feed direction. It has become.

On the side of the feed motor 18 of the feed carrier 12a, as shown in FIG. 10, a guide rail 12h composed of a pair of left and right LM guides is laid horizontally apart vertically. 12
h, a pair of support members 12i are supported via a rail receiver 12j so as to be movable in the contact and separation directions. Guide rods 12k are vertically erected on the support members 12i, and the upper ends of the guide rods 12k are slidable from below a rod hole 6b opened at the downstream end of the transfer bar 6. It is inserted in.

In order to easily understand the operations of the lift drive unit 10, the clamp drive unit 11, and the feed drive unit 12, the drawings schematically show the configurations of FIG.
Shown in In FIG. 11, reference numeral 20 denotes a proximity switch for detecting overrun of the lift shaft, reference numeral 21 denotes a proximity switch for detecting overrun of the clamp shaft, and reference numeral 22 denotes a proximity switch for detecting overrun of the feed shaft.

Next, the operation of the transfer feeder will be described with reference to FIG. Each transfer bar 6 of the transfer feeder is provided with a finger (both not shown) for clamping a work at an opposing position, and the work carried into the upstream side of the press body 1 is provided at each transfer bar 6. The fingers are clamped between the fingers by a clamping operation. When the work is clamped by the fingers, the lift motor 16 of the lift drive means 10 provided in each lift and clamp box 7a rotates the lift ball screw shaft 10d synchronously.
The lift base 10b in the clamp box 7a is raised, whereby the transfer bar 6 is raised to the transport height (pass line) via each lift rod 10e.

When each transfer bar 6 rises to the vicinity of the pass line, the feed motor 18 of the feed driving means 12 provided in the feed box 8a rotates the feed ball screw shaft 12f, so that the guide rail 12c is provided.
The feed carrier 12a is moved downstream along
Thereby, each transfer bar 6 is advanced in the feed direction via the guide rod 12k. When the advance is advanced by a predetermined pitch, the lift motor 16 again rotates the lift ball screw shaft 10d in the direction opposite to the direction of the lift, the transfer bars 6 are lowered, and the work clamped by the fingers is moved to the processing station in the press body 1. When the transfer of the workpiece is completed, the clamp motor 17 of the clamp driving means 11 rotates the clamp ball screw shaft 11e in the direction opposite to that at the time of clamping, so that each transfer bar 6 is moved in the direction in which it is separated. Then, the workpiece is unclamped.

When the unclamping of the work is completed, the feed motor 18 of the feed driving means 12 rotates the feed ball screw shaft 12f in the direction opposite to the advance, so that each transfer bar 6 returns to the original position together with the feed carrier 12a. Is done. Hereinafter, the above operation is repeated to carry in the work and carry out the work processed in the processing station. When there are a plurality of processing stations in the press body 1, the work is processed in the upstream processing station together with the above operation. The finished work is transported to the next processing station, and the work processed in the final processing station is discharged out of the press body.

On the other hand, when assembling the lift / clamp drive unit 8 or adjusting the timing belt 14c which is interlocked between the lift ball screw shaft 10d and the lift motor 16 during the operation due to slack in the tension of 14c, the following diagram is used. While the mounting screw 14f shown in FIG. 6 is loosened, the adjusting screw 14h is rotated to move and adjust the adjusting plate 14d upward in FIG.

As a result, the tension pulley 14g and the feed motor 16 mounted on the adjusting plate 14d are simultaneously moved in the same direction by the same amount.
The lift ball screw shaft 10d is not rotated even if the tension in the timing belt 14c is adjusted by applying no rotational force to the timing belt 14c, thereby preventing an error from occurring in the pass line. be able to.

As shown in FIGS. 13A and 13B, the feed motor 16 or the tension pulley 14
g is adjusted by moving only one of the lift ball screw shafts 10c.
Since the timing pulley 14a attached to the point d is rotated, an error occurs in the pass line, and the work or the finger interferes with a mold or the like during the transfer of the work, thereby causing a problem that the work cannot be smoothly transferred.

In the above embodiment, the lift base 1
0b is formed by square pipe, I-shaped steel, H-shaped steel,
Roller 10f in contact with upper and lower surfaces of lift base 10b
Is supported on the eccentric shaft 10g, and the eccentric shaft 10g is rotated to apply a pressure to the roller 10f.

As a result, there is no backlash when the lift rod 10e moves up and down, and the lift base 10b
Since there is no gap between the upper and lower surfaces and the roller 10f, uneven wear does not occur on the roller 10f, and the life of the roller 10f is greatly improved.

Further, since the lift base 10b is formed of a square pipe, even if the distance between the upper and lower surfaces of the lift base 10b changes due to a manufacturing error or the like, the lift base 10b is elastically deformed to absorb the error. Roller 1
No overload is applied to 0f, and this does not prevent the roller 10f from being damaged or seized.

It should be noted that lubrication is required for sliding parts such as the guide rails and rail receivers and the ball screw shaft and nut members. In the present invention, drive boxes 7 and 8 provided at the lower portion of the press body 1 are used. In order to prevent oil leakage even in the case where the press body 1 is installed upside down, the conventional oil bath type is abolished, and a lubrication method using grease or other oil is adopted.

In the above embodiment, the lift / clamp drive unit 7 and the feed drive unit 8 are installed below the transfer bar 6. However, as shown in FIG. 7 lift below the transfer bar 6 and downstream,
The clamp drive unit 7 and the feed drive unit 8 may be installed above the transfer bar 6, or only the feed drive unit 8 may be installed above the transfer bar 6 as shown in FIG.

Further, as shown in FIG. 12 (c), the upstream and downstream lifts, the clamp drive unit 7 and the feed drive unit 8 may all be installed above the transfer bar 6, and the feed drive unit 8 is connected to the press body 1 May be installed on the upstream side. In any case, when the drive units 7 and 8 are installed above the transfer bar 6, they are installed upside down. At this time, oil leakage does not occur due to the adoption of the oil supply system,
There is no need to process the return piping.

[Brief description of the drawings]

FIG. 1 is a side view of a press equipped with a transfer feeder according to an embodiment of the present invention.

FIG. 2 is a front view of a press equipped with a transfer feeder according to an embodiment of the present invention.

FIG. 3 is a plan view of a press equipped with a transfer feeder according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of a lift and clamp drive unit of the transfer feeder according to the embodiment of the present invention.

FIG. 5 is a vertical sectional view of a lift and clamp drive unit of the transfer feeder according to the embodiment of the present invention.

FIG. 6 is a bottom view of the lift and clamp drive unit of the transfer feeder according to the embodiment of the present invention.

FIG. 7 is a sectional view taken along line XX of FIG. 5;

FIG. 8 is a cross-sectional view of a feed drive unit of the transfer feeder according to the embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a feed drive unit of the transfer feeder according to the embodiment of the present invention.

FIG. 10 is a sectional view taken along the line YY in FIG. 8;

FIG. 11 is a schematic diagram of a transfer feeder according to an embodiment of the present invention.

FIGS. 12A to 12C are explanatory views showing the arrangement side of each drive unit of the transfer feeder according to the embodiment of the present invention.

FIGS. 13A and 13B are explanatory diagrams illustrating a problem that occurs when adjusting the tension of the timing belt. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Press body 6 ... Transfer bar 7 ... Lift and clamp drive unit 10b ... Lift base 10d ... Lift ball screw shaft 10e ... Lift rod 10f ... Roller 10g ... Eccentric shaft 11a ... Clamp carrier 11e ... Clamp ball screw shaft 14 ... Tension adjustment mechanism 14c ... Timing belt 14d ... Adjustment plate 14g ... Tension pulley 14h ... Adjustment screw 16 ... Lift motor 17 ... Clamp motor

Claims (3)

[Claims] 1. A pair of transfer bars 6 arranged side by side in the workpiece transfer direction A are connected to a lift and a clamp drive unit 7 installed on the upstream side and the downstream side of the press body 1 and one of the upstream side and the downstream side. In the transfer feeder, which is driven in the three-dimensional direction by the installed feed drive unit 8 to carry the work, the lift,
A lift base 10b that moves the clamp drive unit 7 up and down through a plurality of lift ball screw shafts 10d that are rotated forward and reverse by a lift motor 16 composed of a servomotor.
, The lower end side of the lift base 10b via the roller 10f.
And a plurality of pairs of lift rods 10e, which are moved by a clamp carrier 11a in a clamp direction orthogonal to the workpiece transfer direction A, and which support the transfer bar 6 from below at the upper end thereof, A screw portion screwed into the carrier 11a is formed into a left-right reverse screw,
A lift and clamp device for a transfer feeder, comprising: a clamp ball screw shaft 11e that is rotated forward and reverse by a clamp motor 17 composed of a servomotor and drives the lift rod 10e in the direction of contact and separation. 2. An endless timing belt 14c is interlocked between each lift ball screw shaft 10d and the lift motor 16, and a tension pulley 14g for tensioning the timing belt 14c and the lift motor 16 are installed on an adjustment plate. 2. The lift and clamp device for a transfer feeder according to claim 1, further comprising a tension adjusting mechanism for adjusting the tension of the timing belt by moving and adjusting the adjusting plate. 3. A plurality of rollers 10f, which are in contact with upper and lower surfaces of a lift base 10b made of a square pipe, an I-beam, or an H-beam, are provided at the lower end of each lift rod 10e, and one of the rollers 10f is eccentric. 2. The transfer feeder lift and clamp device according to claim 1, wherein a pressurizing force is applied to the roller 10f by supporting the shaft 10g and rotating the eccentric shaft 10g.