JPH10180379A - Feed device of transfer feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the length in the feed direction, to make its connecting means into a small size and lightweight, to reduce the cost and to reduce the electric power consumption by supporting the load acting to a guide rod from a transfer bar with the upper and lower parts of a supporting member. SOLUTION: Because a feed ball screw shaft 12f is rotated with a feed moor 18 of a feed driving means 12 when a transfer bar 6 is raised nearby the pass- line, a feed carrier 12a is moved to the downstream side. Thereby, each transfer bar 6 is advanced to the feed direction through the guide rod 12k. When advancing by a prescribed pitch, a lift ball screw shaft 10d is rotated to the reverse direction to the lift time with a lift motor 16, each transfer bar 6 is lowered, and a work clamped with a finger is transferred in the machining station inside a press body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a transfer apparatus 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. 6-18676. 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 screw shaft is provided for the feed driving means and the lift driving means.
The transfer bar is driven in the feed and lift directions by screw feed, and the clamp direction is driven by a rack and a pinion.

[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,
Since the drive in the lift direction is performed by screw feed, the lift direction is not affected by the backlash, but the drive in the feed direction is performed by the rack and the pinion, so the same as the above publication There is a problem.

On the other hand, in Japanese Utility Model Laid-Open Publication No. Hei 6-86828, since the driving in the feed direction and the lift direction is performed by screw feed, 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.

Further, since a ball screw shaft is provided for each transfer bar and these ball screw shafts are driven by a single feed motor, a power transmission path from the feed motor to the ball screw shaft is complicated, and the apparatus is large and large. There were also problems such as becoming expensive. SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a transfer device for a transfer feeder, which can perform high-precision conveyance and has a simple structure.

[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, a clamp drive unit, and a feed drive unit installed in a pair of an upstream side and a downstream side to transport a work, A feed carrier guided by a guide rail laid in the work transfer direction and movable in the feed direction; and a nut member provided parallel to the guide rail and provided at a central portion of the feed carrier. Feed ball screw shaft connected to the feed ball screw shaft and the feed ball screw shaft A feed motor consisting servo motor for rotating, mounted for contact and separation in the feed carrier, and is a more structure and connecting means for connecting one end of the feed carrier and transfer bars.

According to the above configuration, even if the feed drive unit is installed upside down, no oil leakage or the like occurs, so that the feed drive unit can be installed not only below the transfer bar but also above the transfer bar. Therefore, the drive units can be shared.

Further, since the feed carrier is driven by the ball screw feed, no backlash is generated in the feed direction due to backlash, and the positioning accuracy at the time of transporting the work is improved. Therefore, the positioning accuracy at the time of loading the work is required. By adopting such a device in a cold forging press or the like, high-precision working becomes possible and the occurrence of defective products can be greatly reduced.

[0015] Further, the first carrier provided at the center of the feed carrier is provided.
Since the feed carrier is moved by the two feed ball screw shafts, it is not necessary to split the driving force of the feed motor and transmit it to the ball screw shaft, as compared with the conventional one driven by two ball screw shafts. In addition, the structure of the drive system can be simplified and the size can be reduced.

In order to achieve the above object, according to the present invention, the connecting means is provided with a plurality of guide rails which are vertically separated from each other and laid along the clamping direction, and the upper and lower parts are supported by these guide rails. And a pair of support members that are movable in the contact and separation directions, and are erected on the upper ends of these support members,
Further, the transfer bar is constituted by a guide rod slidably fitted in a rod hole opened at the end of the transfer bar.

With the above structure, the load acting on the guide rod from the transfer bar is supported by the upper and lower portions of the support member, so that the length in the feed direction is shorter than in the conventional case where the load is supported before and after in the moving direction. Therefore, the size and weight of the connecting means can be reduced. As a result, the size of the feed motor for driving the feed carrier and the feed ball screw shaft can be reduced, so that the cost and power consumption can be reduced and the cost is reduced.

According to a third aspect of the present invention, a guide rail for guiding the movement of the feed carrier is provided immediately below the feed ball screw shaft.

With the above configuration, the number of parts can be reduced as compared with the conventional case where the feed carrier is supported by a plurality of guide rails, and the clearance is adjusted for each guide rail so that the feed carrier moves smoothly. This eliminates the necessity of such steps, so that the man-hours required for assembly and adjustment can be greatly reduced, and the number of refueling points is reduced, so that maintainability is also improved.

[0020]

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, 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 installed in the press body 1, which has a pair of transfer bars 6 arranged side by side 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 composed 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 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.

Each of the slots 14e has a mounting bolt 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 the both ends of the lift base 10b, the lower portions of a pair of lift rods 10e are 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 pressure so as to press the lower roller 10f against the lower surface of the lift base 10b. A vertical play is prevented between the lift base 10b and the lift rod 10e, 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 in the longitudinal direction on both sides of the opposing surface 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, and are fitted from below to guide rails 6a laid on the lower surfaces at both ends of the transfer bar 6, from which the respective transfer bars 6 are mounted. 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 a lift and an LM guide laid on the upper part of 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 10b. As shown in FIG. 7, a vertically long slot 10j is opened.

One end of the clamp ball screw shaft 11e is connected to a clamp motor 17 composed of a lift and a servomotor mounted on the end face of the clamp box 7a. The clamp motor 17 rotates the clamp ball screw shaft 11e forward and backward. Thus, each clamp carrier 11a can be moved in the contact / separation 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 12a. A feed ball screw shaft 12f composed 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 feed carrier 18 side 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 horizontally laid 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 workpiece 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.

It is to be noted that lubrication is required for sliding parts such as each guide rail and rail receiver, and ball screw shaft and nut member. In the present invention, drive boxes 7 and 8 provided at the lower portion of press body 1 are provided. 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 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. 12C, 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. In this case, 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.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Press body 6 ... Transfer bar 6b ... Rod hole 7 ... Lift and clamp drive unit 8 ... Feed drive unit 12a ... Feed carrier 12c ... Guide rail 12e ... Nut member 12f ... Feed ball screw shaft 12h ... Guide rail 12i ... Support member 12k ... Guide rod 18 ... Feed motor A ... Work transfer direction

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiyuki Takada 1 Kushimachi Fu, Komatsu City, Ishikawa Prefecture Inside Komatsu Industrial Machinery Techno Co., Ltd.

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 feed drive unit 8 is guided by the guide rail 12c laid in the work transfer direction A. A feed carrier 12a movable in a feed direction, and a feed carrier 1a provided in parallel with the guide rail 12c;
A feed ball screw shaft 12f screwed into a nut member 12e provided at the center of the feed ball screw shaft 2a; and a feed ball screw shaft 12f connected to the feed ball screw shaft 12f.
a feed motor 18 composed of a servo motor for rotating f forward and reverse, and connecting means provided so as to be able to freely contact and separate from the feed carrier 12a and connecting one end of the transfer bar 6 to the feed carrier 12a. Feeder of the transfer feeder. 2. A plurality of guide rails 12 which are vertically separated from each other and are laid along a clamping direction.
h, a pair of support members 12i whose upper and lower portions are supported by these guide rails 12h and are movable in the contact and separation directions, and are erected on the upper ends of these support members 12i and opened at the ends of the transfer bar 6. 2. The feeder for a transfer feeder according to claim 1, comprising a guide rod 12k slidably fitted in the rod hole 6b. 3. The transfer device for a transfer feeder according to claim 1, wherein a guide rail 12c for guiding the movement of the feed carrier 12a is provided immediately below the feed ball screw shaft 12f.