WO1997033711A1

WO1997033711A1 - Lift device for transfer feeder

Info

Publication number: WO1997033711A1
Application number: PCT/JP1997/000802
Authority: WO
Inventors: Shigekazu Noda; Kiichirou Kawamoto; Masaaki Kashiwa
Original assignee: Komatsu Ltd.
Priority date: 1996-03-15
Filing date: 1997-03-13
Publication date: 1997-09-18
Also published as: JP3773126B2; JPH09248638A

Abstract

A transfer feeder comprises a lift beam (3) mounted in a transfer press body (1) of a transfer press, which has a plurality of processing stations (W1, W2, ---), and adapted to be vertically moved by a plurality of lift devices (4) installed above the transfer press body. In the transfer feeder, lift rods (7), respectively, upper and lower side portions of which are supported on lift boxes (4a) of the respective lift devices through ball splines to be vertically movable, are provided, and a rack (7b) adapted for engagement with a pinion (8), which is rotated in forward and reverse directions by a lift drive source (10), is formed on the respective lift rods. The lift beam is mounted substantially horizontally to a lower side portion of the lift rod.

Description

Description Transfer feeder lift device Technical field

The present invention relates to a lift device for a transfer feeder provided in a transfer prepress. Background art

Conventional transfer presses have multiple press stations in the press body, and these press stations are used to form workpieces sequentially. Have been.

In addition, the press body is equipped with a transfer feeder that sequentially transports the work to each processing station.

This trans-feeder is provided with a plurality of trans-floor lift beams extending in the work transport direction, and a finger mounted on the trans-fiber. The work is held by a cross bar attached to the lift beam via a cross bar carrier, and the trans- mission fiber lift beam is moved in two or three dimensions. By being operated, the work is conveyed to each processing station sequentially.

On the other hand, among the above-mentioned transfer feeders, there are ones in which a feed mechanism, a lift mechanism, a clamp mechanism, etc. are driven by power taken out from a press body. .

Normally, these mechanisms are installed on the floor upstream or downstream of the press body. However, when these mechanisms are installed on the floor side, a work loading device that loads the work into the press body or a work that completes the formed work is discharged from the press body. There is a problem that hinders the installation of the work unloading device.

In order to improve such a problem, a feed mechanism or a lift mechanism is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 6-218845 or Japanese Patent Application Laid-Open No. Hei 6-21859. A trans-feeder has been proposed, in which is installed above the press body.

In the transfer feeders described in the above publications, a lift beam is vertically driven by a lift mechanism using a servomotor as a drive source, and a press body is provided upstream of the press body. A feed mechanism consisting of a feed cam that is rotated by the extracted power and a feed lever that is swung by the feed cam is installed. The cross bar carrier, which is supported by the lift beam, is driven by the feed mechanism in the feed direction.

In the above-mentioned lift device, a plurality of lift boxes fixed to the upper part of the press body are provided with lift rods which penetrate vertically, respectively, and these lift rods are lifted. It is slidably supported in the vertical direction by bushings provided at the upper and lower parts of the foot box, and the horizontal position of the lift beam is set between the lower ends of the lift rods. At the same time, racks are formed at the top of each of the lift rods, and these racks are combined with pinions provided in the lift box.

Each of the above pinions is connected to a lift drive source consisting of a servomotor via a reduction gear, and controls each lift drive source synchronously. In addition, by rotating the pinion by each of the lift drive sources, the lift beam can be moved up and down via each of the lift rods.

In the conventional lift device described above, if a synchronization error occurs at the time of initial setting or an overrun occurs during operation, some of the lift rods deform and the frictional resistance with the bush increases rapidly. As a result, a lift drive source with a large capacity is required to move the lift beam up and down, and when the frictional resistance between the lift rod and the bush exceeds the limit, the lift There are other problems, such as the rod sticking into the bush, and the sliding part being seized, making it impossible for the lift beam to move up and down.

In addition, if the length of the lift rod increases as the lift stroke of the lift beam increases, the length of the lift box increases accordingly. However, the lift box is large and heavy, requiring a lot of space for installation, and also has the disadvantage of increasing the price.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and has been made in view of the fact that a lift drive source having a small capacity can smoothly move a lift beam up and down. The purpose of this is to provide a lift device. Disclosure of the invention

One embodiment of the present invention for achieving the above object,

A press of a transfer press having a plurality of stations. A lift beam is provided in the main body and has a lift beam that can be moved up and down by a plurality of lift devices installed above the press body. Ulan In the SF feeder,

A lift rod whose upper side and lower side are supported vertically so as to be able to move up and down via a ball spline is provided in a lift box of each of the lift devices, respectively.

A rack is formed on each of the lift rods so as to engage with a pinion rotated forward and reverse by a lift drive source,

This is a trans feeder lift device in which the lift beam is mounted substantially horizontally on the lower end side of the lift rod.

With the above configuration, when the pinion is rotated forward or backward by the lift drive source, the respective lift rods move up and down in synchronization with each other, so that the lift beam is moved up and down while being held almost horizontally. In addition to this, each lift rod is supported by the lift box at the top and bottom by a ball spline, so that the frictional resistance can be greatly reduced. Since a small, small-capacity servomotor can be used for a large area, significant cost reductions can be achieved.

In addition, by adopting a ball spline for the support portion of the lift rod, even if a part of the lift rod is deformed due to synchronization deviation during initial setting or overrun, etc., the lift can be performed. Since the lever does not penetrate into the bush and seizure does not occur on the sliding surface, problems such as inability to perform the lift operation can be solved.

'In the above configuration,

Each of the lift rods is a hollow shaft, and a lift rod that is exposed between the lift box and the lift beam is extended and retracted by following up and down movements of the lift rod. You may cover it with one.

With the above configuration, the lift rod can be lifted without lowering its rigidity. Since the weight of the rod can be reduced, it is possible to easily cope with high speed, and the load capacity is large, and even if the lift stroke of the lift rod is long, the lift box It is not necessary to increase the length according to the lift stroke, so that the size of the lift device and the installation space can be reduced.

In addition, even in the case of presses where the lift stroke is not large because the space for installing the lift box is small, providing a telescopic cover increases the lift stroke. can do.

In the above configuration,

A backlash adjusting means for adjusting a backlash between the rack and the pinion may be provided between the lift drive source and the pinion.

With the above configuration, when each lift rod moves up and down, there is a slight shift in the vertical movement of each lift rod due to the variation of the backlash between the rack and the pinion. Since it does not occur, vibration of the lift beam and generation of noise can be prevented.

In the above configuration,

A recovery oil passage may be provided in the telescopic cover so that lubricating oil that lubricates a sliding portion in the lift box flows into the lift beam.

With the above configuration, the oil that lubricated each sliding part in the lift box is collected through the oil collection passage, so that oil leaking from the lift box is Spattering can be prevented. BRIEF DESCRIPTION OF THE FIGURES

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is illustrated in the following detailed description and attached drawings illustrating embodiments of the invention. Some aspects will be better understood. The embodiments shown in the accompanying drawings are not intended to specify the invention, but merely to facilitate explanation and understanding.

In the figure,

FIG. 1 is a front view of a transformer feed press equipped with one embodiment of a trans feeder lift device according to the present invention.

FIG. 2 is a plan view of a transfer feeder having the lift device according to the embodiment.

FIG. 3 is a view taken in the direction of arrow ΙΠ in FIG.

FIG. 4 is an enlarged front view of the lift device according to the embodiment. FIG. 5 is a cross-sectional view of the lift device according to the above embodiment.

FIG. 6 is a sectional view taken along the line VI-VI of FIG.

FIG. 7 is a sectional view taken along the line VII-VII in FIG.

FIG. 8 is a sectional view taken along the line VI of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a transformer feeder provided with a transformer feeder according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view of a transfer abrasion equipped with an embodiment of a transfer feeder lift device according to the present invention, which adopts a vacuum transfer method, and FIG. FIG. 3 is a plan view of a transfer feeder having a lift device as an example, FIG. 3 is a view taken in the direction of the arrow in FIG. 1, and FIG. 4 is an enlarged front view of the lift device of the above embodiment. cross section along to ¹ H line - figure 5 is a sectional view of re oice device is the above embodiment, FIG. 6 is a sectional view taken along the VI- VI line of FIG. 5, FIG. 7, W in FIG. 4 Figure, Figure 8 H

Fig. 7 is a sectional view of the shelf along the VDI line in Fig. 7.

In these figures, 1 indicates a press body, and 2 indicates a trans-feeder provided in the press body 1.

The transfer feeder 2 has a pair of lift beams 3 arranged side by side so as to extend in the feed direction X. Numeral 3 is adapted to be synchronously moved up and down by a plurality of lift devices 4 installed at an upper portion of the press body 1 at intervals in the feed direction X.

As shown in FIGS. 4 to 8, each of the lift devices 4 has a lift box 4a fixed to the press body 1 side. A lift rod 7 supported by a ball spline so as to be able to move up and down is provided in the box 4a.

The lift rod 7 has a hollow shaft shape, and a plurality of splines 7a are formed in the outer peripheral surface in the axial direction, and the upper part of each lift box 4a is formed. It is provided so as to penetrate the bush 4b installed in the lower part in the vertical direction.

As shown in FIG. 6, balls 4c that fit into the splines 7a of the lift rods 7 are rotatably provided in the bushings 4t>. By supporting the lift rod 7 with the upper and lower bushes 4b via the shaft, the lift rod 7 can move up and down smoothly with a small driving force.

A rack 7b is formed on the upper side of the lift rod 7, and a pinion 8 provided in the lift box 4a is combined with the rack 7b. I have.

Then, the pinion 8 is cooled by a worm A lift drive source 10 consisting of a motor is connected.

The lift drive source 10 is fixed almost vertically to the upper part of the lift box 4a with the rotating shaft 10a facing downward, and the tip of the rotating shaft 10a is a worm reducer. It is connected to 9 input shafts 9a.

As shown in FIG. 7, the input shaft 9a is provided with a worm 9b, and the worm 9b is combined with a ohm wheel 9d provided on the output shaft 9c. The pinion 8 is attached to the output shaft 9c. By rotating the pinion 8 forward and reverse through the worm speed reducer 9 by the lift drive source 10, each lift rod 7 is simultaneously moved in the lift direction Y. At the same time as being able to move up and down, the worm reducer 9 can prevent the lift rod 7 and the lift beam 3 from falling.

Further, a backlash adjusting means 11 for adjusting the backlash between the rack 7b and the pinion 8 is provided at the connection between the warm reducer 9 and the lift box 4a. I have.

As shown in FIGS. 7 and 8, the backlash adjusting means 11 has an eccentric cylinder 11a rotatably provided in a lift box 4a. The output shaft 9c is rotatably supported in 11a via a bearing 11b.

The eccentric cylinder 11a has an eccentric portion 11c that is eccentric with respect to the center of the pinion 8 and rotatably supports the pininan 8, and the eccentric portion 11c is lifted. In addition to being rotatably supported by the box 4a, the end of the eccentric cylinder 11a has a flange 11 clamped between the lift box 4a and the worm reducer 9. d is provided, and this flange 11 d is centered on the axis of the eccentric part 11 c as shown in Fig. 8. A plurality of arc-shaped long holes 11 e are formed.

The mounting bolts 11 f for fixing the worm reducer 9 to the lift box 4 a are inserted into these long holes 1 le.

On the other hand, the upper end protruding portion of each of the lift rods 7 is covered by a cylindrical cover 12 fixed to the upper surface of the lift box 4a so as not to be exposed to the outside. Has become. In addition, a plurality of lubrication ports 14 to which lubrication pipes 13 piped from a lubrication system (not shown) of the press body 1 are provided above the lift box 4 a and the worm reducer 9. The lubricating oil supplied to these lubrication ports 14 is supplied to the sliding parts of the push rods 4 b provided on the upper and lower parts of the lift box 4 a and the lift rod 7, and the rack 7. It is supplied to the joint between b and pinion 8 and to the joint between worm 9b and worm wheel 9d to lubricate them.

The lower ends of the lift rods 7 protruding from below the respective lift boxes 4a are fixed to the upper surface of the lift beam 3 via the mounting plate 7c. The lift beam 3 is held in a horizontal state by the lever 7, and the outer periphery of the lower end of the lift rod 7 is covered by a telescopic cover 16.

As shown in FIG. 5, the telescopic cover 16 has a telescopic structure that expands and contracts in three stages, for example, and the upper end of the small-diameter upper cylinder 16 1 has an outer peripheral surface of the lower bush 4 b. It is fitted to.

The lower end of the upper cylinder 16 1 is slidably inserted into the intermediate cylinder 16 2 from above, and the outer peripheral surface of the upper cylinder 16 1 slides on the inner peripheral surface of the intermediate cylinder 16 2. A contact ring 17 is provided.

At the upper end of the intermediate cylinder 16 2, the intermediate cylinder 16 2 is higher than the upper cylinder 16 1 An engagement portion 16a is formed to engage with the lower end of the upper cylinder 161 so as not to come off, and the lower end of the intermediate cylinder 162 is positioned upward in the large-diameter lower cylinder 163. It is more fitted.

The lower end of the lower cylinder 16 3 is fixed to the upper surface of a mounting plate 7 c provided at the lower end of the lift rod 7, and the peripheral surface of the telescopic cover 16 and the lift rod 7 A recovery oil passage 18 is formed along the lift rod 7 with the outer peripheral surface, and a lower end side of the recovery oil passage 18 is provided with a mounting plate 7 c and a lift beam 3. It communicates with the recovery oil passage 3 a in the lift beam 3 by a communication hole 7 d opened on the upper surface of the lift beam 3.

In a normal lift stroke, only the lower cylinder 16 3 moves upward and the intermediate cylinder 16 2 does not move up and down, but the lift beam 3 moves upward as in the case of mold replacement. When forcibly lifted, the intermediate cylinder 16 2 is also raised by the lift beam 3.

1 and 4, reference numeral 19 denotes a balance cylinder. When the lift beam 3 is urged upward by the balance cylinder 19, the lift cylinder is lifted. The capacity of the driving source 10 can be reduced.

On the other hand, guide rails 3 e extending along the feed direction X are laid on both lower sides of each of the lift beams 3, and a plurality of crossbar carriers 24 are provided on these guide rails 3 e. Is movably suspended in the feed direction X.

Each of the crossbar carriers 24 is divided into a main carrier 241 and a subcarrier 242 as shown in FIGS. 1 and 2, and the main carrier 241 and the subcarrier 24 are divided. Between 242, the secondary carrier 242 is shifted in the feed direction X relative to the primary carrier 241. A variable feed stroke means 25 is provided.

The above-mentioned feed-stroke varying means 25 is composed of, for example, a servo cylinder, and the main carrier 24 1 is operated while the crossbar carrier 24 is operating in the feed direction X. The feed stroke can be changed by shifting the auxiliary carrier 242 with respect to the input signal. Further, a crossbar 26 is laid between the subcarriers 242 facing each other in a direction orthogonal to the feed direction.

Each of the crossbars 26 is formed of a long rectangular steel pipe or the like, and a plurality of the crossbars 26 are arranged at intervals in the feed direction X as shown in FIG. A plurality of work suction means 27 such as vacuum cups are attached to each cross bar 26 via a support arm 27a, and the work 28 is held by these work suction means 27. It can be adsorbed from above.

On the other hand, the main carriers 24 1 of the crossbar carriers 24 are connected to each other as shown in FIG. 2 by a connection 扦 29 provided below the lift beam 3. The crossbar carrier 24 is simultaneously movable in the feed direction X. Further, the main carrier 241, of the crossbar carrier 24 located at the most upstream side, and the feed lever of the feed means 30 provided upstream of the press body 1? 0 a is linked by link 31.

The feed means 30 has a force box 30d fixed to an upper portion of the press body 1, and the power taken out of the press body 1 into the cam box 30d. A camshaft 30b is provided which is rotated. The cam shaft 30_b is provided with a feed cam 30c corresponding to each of the lift beams 3, and the upper end of the support is provided by the feed cam 30c. The lower end side of the feed lever 30a is pivoted in the feed direction X with the center as the center, whereby the feed lever 30a is connected via the link 31. Each crossbar carrier 24 is reciprocated in the feed direction X.

In addition, 32 in Fig. 1 indicates the means for carrying in the work, and Fig. 3 BB 33 indicates the slide.

Next, the operation of the trans-feeder configured as described above will be described.

The plate-shaped work 28 to be formed is carried in by the work carrying means 32 from the upstream side of the transformer press body 1 (left side in FIG. 1). Next, the feed lever 30 is rotated by the feed cam 30c which is rotated by the power taken out by the slide drive mechanism of the transformer press main body 1. is swung, and the crossbar carrier 24 connected to the feed lever 30a via the link 31 is moved to the upstream side. At the same time, the lift drive source 10 provided in the lift device 4 rotates the pinion 8 via the worm reducer 9, so that the lift beam 3 is provided via each lift rod 7. Is raised.

As a result, the cross bar 26 which has been waiting at the standby position which is set at almost the midpoint of all the strokes is moved above the work 28 in accordance with the preset motion pattern. The work suction means 27 attached to the cross bar 26 located on the most upstream side is moved down to the position above the work 28 and moved down. press The work 28 carried into the main body 1 is sucked, and the work suction means 27 on the downstream side of the work 28 picks up the work 27 that has been formed at each processing station W2, W3,…. Adsorb.

Thereafter, since the lift beam 3 is raised by the lift device 4, the cross bar 26 is also raised according to a predetermined operation pattern, and the work suction means 27. When the sucked work 28 has reached the vicinity of the pass line, the feed lever 30a is swung, so that each cross bar carrier 24 moves in the feed direction. Moved to X, crossbar 26 starts advanced operation.

Then, when the workpiece 28 has reached the vicinity of the upper portion of the next machining station W 2 .W 3,..., The lift beam 4 is lowered by the lift device 4. Then, the cross bar 26 is lowered according to a predetermined motion pattern, and the work 28 is carried into the machining stations W 2, W 3.

Thereafter, when the work suction means 27 releases the work 28, the cross bar 26 starts a return operation, and the cross bar 26 is returned to the first standby position, and It is stopped at the standby position.

Hereinafter, the above operation is repeated in synchronization with the operation of the press body 1.-The work 28 carried into the press body 1 is sequentially processed by each of the stations Wi, W2,…, and processed. The completed work 28 is carried out of the press body 1.

On the other hand, the lubricating oil supplied to the lift device body 4 from the lubrication system of the press body 1 is supplied to each sliding portion in the lift box 4a and the worm 9 and then fall to the inner bottom of the lift box 4a. After that, it flows into the smoothing cover 16 through gaps such as the spline 7 a and the rack 7 b formed in the bush 4 b and the lift rod 7. Then, the collected oil in the lift beam 3 passes through the retrieving road 18 formed between the telescopic cover 16 and the lift rod 7 and the communication hole 7d opened in the mounting plate 7c. After reaching the passage 3a, it flows through the recovery oil passage 3a to the downstream side of the lift beam 3 and passes through the flexible pipe 20 from the oil drain b 3b provided at the downstream end to the press body 1 via the flexible tube 20. To the lubrication system.

Also, a plurality of lift rods 7 for suspending each lift beam 3 from above are connected to bushs 4b installed above and below the lift box 4a via ball splines. Since it is supported slidably up and down, the frictional resistance is greatly reduced as compared with the conventional one that is only supported by a bush, thereby reducing the capacity of the lift drive source 10. As well as lift bars due to synchronization loss and overruns.

Even if a part of 7 is deformed, there will be no penetration or burning.

On the other hand, the rack between the racks 7b provided on the plurality of lift rods 7 for suspending the respective lift beams 3 from above and the pinion 8 corresponding to the racks 7b is provided. If there is a crack in the crash, when the lift beam 3 moves up and down, the lift stroke of each of the lift rods 7 will vary, and the lift beam 3 will not work. May cause regular vibration and noise.

In order to solve such a problem, a backlash adjusting means 1 i is provided between the worm reducer 9 and the lift box 4 a. In adjusting the backlash by the backlash adjusting means 11, first, the mounting bolt on which the worm reducer 9 is mounted is used. Loosen the tilt 11 f and rotate the eccentric cylinder 11 a in this state.

As a result, the eccentric cylinder 11a, on which the pinion 8 is supported, moves in the vertical direction by the action of the eccentric portion 11c, so that the bag between the rack 7b and the pinion 8 moves. Crash can be adjusted.

By adjusting the backlash of the rack 7b and the pinion 8 provided on each lift rod by the backlash adjusting means 11 so as to be substantially uniform, Vibration and noise when the lift beam 3 moves up and down can be reduced.

In the above-described embodiment, the telescopic cover 16 has a telescopic structure that expands and contracts in three stages. However, it is of course possible to provide the bellows-like telescopic cover 16.

In the above-described embodiment, the transfer feeder having the structure in which the crossbar carrier 24 is divided into the main carrier 241 and the subcarrier 242 has been described, but the crossbar carrier 24 has a divided structure. The present invention may be applied to an untransformed feeder, or the lift device 4 may be applied to the entirety of the transfer feeder installed above the press body 1. It is possible.

Although the present invention has been described with reference to exemplary embodiments, it is understood that various changes, omissions, and additions can be made to the disclosed embodiments without departing from the spirit and scope of the present invention. The person skilled in the art is himself. Therefore, the present invention is not limited to the above-described embodiments, but should be understood as including the range defined by the elements described in the claims and their equivalents. No.

Claims

The scope of the claims

1. A lift mounted in the press body of a transfer press having a plurality of machining stations and moved up and down by a plurality of lift devices installed above the press body. In the transfer feeder with the beam,

A lift rod whose upper and lower sides are vertically movably supported via a ball spline is provided in a lift box of each of the lift devices, respectively.

A lift device for a transfer feeder, wherein the lift beam is mounted substantially horizontally on a lower end side of the lift rod.

2-Each of the lift rods is a hollow shaft, and a lift rod exposed between the lift box and the lift beam follows the vertical movement of the lift rod. 2. The lift device for a transfer feeder according to claim 1, wherein the lift feeder is covered with a telescopic cover that expands and contracts.

3. A backlash adjusting means for adjusting a backlash between the rack and the pinion is provided between the lift drive source and the pinion. A lift device for the transformer feeder according to range 1.

4. A recovery path for allowing the lubricating oil that lubricates the sliding portion in the lift box to flow into the lift beam is provided in the telescopic cover. The transfer feeder lifting device according to claim 1