JP2652963B2 - Transfer device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a transfer device employing a servomotor as a power source.

(Prior Art) A conventional transfer device transports a work to be pressed. Then, two long feed bars are positioned on both sides of a die for press working, for example, a lower die and an upper die, and these bars clamp and transport the work while sandwiching the work from both sides. The transfer device is
For example, as shown in JP-A-59-33042, a pair of parallel feed bars can be moved in the front-rear direction, the horizontal direction and the vertical direction, and the workpiece is clamped → lifted → forward →
A series of operations of descending, unclamping, retreating, and clamping are repeated, and the work is sequentially conveyed to the next step press.

(Problems to be Solved by the Invention) However, the driving force transmission unit to the feed bar in the above-described conventional technology converts the rotational driving force of the DC servo motor into linear motion by a rack and pinion. However, the conventional rack and pinion always needs to supply the lubricating oil, and the conventional transfer device having the rack and pinion at many points is
Since the entire apparatus is large, the installation area is large and the lubricating oil has to be supplied to a large number of places, so that oil leaks easily occur from the transfer apparatus and the work floor is easily contaminated. Further, the clamp motor and the up-down motor in the conventional apparatus are of a horizontal type, and project in the lateral direction of the clamp-up / down unit to reduce the work floor area.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems of the related art, and has as its object to provide a compact unitized transfer device that does not cause oil leakage and does not reduce the work floor area.

Means for Solving the Problems The present invention has been made to achieve the above object, and is a transfer device including a pair of feed bars, a feed unit, and a clamp-up / down unit. The transfer device is characterized in that the components are configured as shown in (a), (b) and (c) below. That is, a. B. A pair of feed bars provided in parallel with each other along the work transfer direction; A slider that is provided at the rear of the base of the feed bar and is movable in the front-rear direction by providing a ball screw nut that is screw-coupled to a feed screw disposed in the same direction as the feed bar; And a servo motor which is arranged so as to advance and retreat the feed bars by the feed pins, and which is disposed as a driving source of the feed screw so that its output shaft is stepwise parallel to the feed screw. A feed unit in which a feed mechanism having a feed mode is housed in a unit housing; c. At the stretch base and near the stretch end of the feed bar,
It is provided in a direction perpendicular to the feed bars, and a.A gear case with an oil bath is located at a position extending outward from one of the feed bars, and the output shaft is placed vertically on the gear case with an oil bath. And a gear case with an oil bath, the gear at the lower end of the output shaft of the clamp motor and the gear at the shaft end of the feed screw described below are meshed and housed in the gear case with the oil bath. One extension part, b. Located in a position extending outward from the other feed bar, a gear case with an oil bath, and placed vertically so that the output shaft faces vertically downward An up / down motor composed of a servomotor is provided, and the gear case with the oil bath is provided with a gear at the lower end of the output shaft of the up / down motor and a gear at the shaft end of the following spline rod. The other extension part meshed with each other and hermetically housed; c. The feed screw and the spline rod between the gear case with oil bath and the part protruding from the following slide frame covered with the coil cover A pair of slide frames which are axially mounted in parallel with each other in the direction along the direction, and which are horizontally movable by being provided with a nut of a ball screw which is screwed to the feed screw, are provided on the feed screw; In the frame,
An intermediate portion having a rack gear meshing with the pinion provided on the spline rod, and an up-down rod supporting the feed bar at its upper end so as to be able to slide back and forth, and being vertically movably supported. A clamp up / down unit in which a down mechanism is housed in a unit housing except for the upper ends of the clamp motor, the up / down motor and the up / down rod.

(Operation) The feed mechanism slides the feed bar in a forward or backward direction via a feed screw driven by a feed motor placed behind and behind the base of the feed bar. The clamp mechanism slides the feed bar in a clamp or unclamping direction via a feed screw driven by a clamp motor vertically disposed on the extension end side of one of the feed bars. The lift mechanism drives the feed bar in the up or down direction via a spline rod driven by an up / down motor vertically disposed on the extension end side of the other feed bar. Power is transmitted to the feed screw for transmitting the driving force of the clamp motor through a gear sealed in a gear case with an oil bath. A spline rod for transmitting the driving force of the up-down motor also transmits power via a gear sealed in a gear case with an oil bath.

(Embodiment) Next, an embodiment of the present invention will be described with reference to FIGS.

FIG. 2 is a plan view showing the entire transfer apparatus according to the embodiment of the present invention, FIG. 3 is a front view of FIG. 2, and FIG.
1 is a sectional view taken along the line II of FIG. 2, FIG. 5 is a sectional view taken along the line VV of FIG. 1, and FIG. 6 is an enlarged view of a portion VI of FIG. FIG. 7 is a front view of FIG.

As shown in FIG. 2, the pair of feed bars 10, 10 are provided in parallel with each other along the transport direction of a work (not shown) to be pressed. The feed bar 10 is generally located on both sides of a work to be pressed by a mold including an upper mold and a lower mold, and functions to sequentially convey the work to a press in the next process.

That is, a jig called a finger (not shown) is attached to the inside or the upper side of the feed bar 10, and the finger presses the work from both sides and clamps and conveys the work.

Then, conveyance is performed by repeating a series of operations of clamp → up → forward → down → unclamping → backward → clamp. As shown in FIGS. 2 and 3, a pair of feed bars 10 are supported on front and rear guides 12 provided two in the front and rear direction, respectively.

The feed bar 10 moves in the vertical direction and the horizontal direction, and at the same time, the feed bar 10 slides on the front and rear guide 12 in the front and rear direction.
That is, movement in the horizontal direction, the vertical direction, and the front-back direction can be performed.

Slide the feed bar 10 on the front and rear guide 12
Is a feed pin 16 penetrating vertically through a round hole at the end of the feed bar 10, as shown in FIG.
It can be moved up and down along 16 vertical directions.

Next, a clamp-up / down unit 18 for moving the feed bar 10 in the horizontal and vertical directions via the front-rear guide 12 will be described with reference to FIG.

The front-rear guide 12 is fixed to the upper end of an up-down rod 20 provided in the up-down direction. The up-down rod 20 is held so as to be vertically movable with respect to a slide frame 22 existing inside the housing of the clamp-up / down unit 18, and has a rack gear 24 (fifth
(See the figure).

A pinion gear 26 meshes with the rack gear 24. The pinion gear 26 is held by the front and rear slide frame 22. The slide frame 22 is provided with two slide guides 3 provided laterally inside the unit housing 28.
It is slidably attached to 0,30 in the horizontal direction. A ball screw nut 31 is fixed to the slide frame 22 via a bracket. A feed screw 32 penetrates the nut 31.

The feed screw 32 has a male screw formed on the outer peripheral surface thereof, is supported by a bearing portion fixed to the unit housing 28, and is rotatably supported by the unit housing 28.

A pair of bevel gears 34 are provided at ends of the feed screw 32, and are connected to a shaft of a clamp motor 36 provided in a direction perpendicular to the feed screw 32, that is, in a vertical direction.

A spline rod 38 penetrates through the pinion gear 26 coaxially. The spline rod 38 has a spline 40 formed on the surface, is capable of sliding in the lateral direction with respect to the pinion gear 26, and is capable of transmitting a rotational force.

The spline rod 38 is supported by a bearing portion fixed to the unit housing 28 and is rotatably supported by the unit housing 28.The spline rod 38 is provided vertically through a pair of bevel gears 42 provided at the ends. Connected to the axis of the up / down motor 44.

The slide guides 30, 30, the feed screw 32, and the spline rod 38 are horizontally provided in parallel with each other. The feed screw 32 and the spline rod 38 are covered with an elastic coil cover 45 to protect the surfaces from dust.

Further, the bevel gears 34, 42 provided at the ends of the feed screw 32 or the spline rod 38 and the support portions of the rods 32, 38 by the unit housing 28 are collectively housed in the gear cases 46, 48. , Inside is filled with lubricating oil. The gear cases 46 and 48 are oil baths so that the lubricating oil 50 does not leak out of the unit housing 28 (FIG. 1).

The lubricating oil 50 collected at the bottom of the gear cases 46 and 48
Is pumped up by an oil pump (not shown) and supplied again from above the gear cases 46 and 48.

As shown in FIGS. 2 and 3, there are two clamp-up / down units 18 in the front-rear direction.

Next, a feed unit 52 for moving the feed bar 10 in the front-rear direction will be described with reference to FIGS.

Feed pin 16 that moves feed bar 10 back and forth
Holds the feed bar 10 slidably in the up-down and front-rear directions, and is fixed to the slider 54. The slider 54 is slidable along the slide guide 56 in the horizontal direction.

The slide guide 56 is fixed to the slide frame 58. The slide frame 58 is connected to the feed unit 52
The unit housing 60 is slidable in the front-rear direction along two slide guides 62 (see FIG. 1) extending in the front-rear direction.

A ball screw nut 64 is fixed to the center of the slide frame 58, and a feed screw 66 is attached to the nut 64.
Penetrates horizontally in the front-rear direction. The feed screw 66 has a male screw formed on the outer peripheral surface, and is rotatably supported by the unit housing 60. A pulley 68 is fixed to a rear end of the feed screw 66, and the pulley 68 is rotated by a feed motor 72 via a belt 70. The axis of the feed motor 72 is parallel to the feed screw 66.

A proximity switch 74 is provided between the slide frame 58 and the unit housing 60, and
It detects 58 forward and backward movements.

A proximity switch 76 is also provided between the slide frame 58 and the slider 54, so that the lateral movement of the slider 54 is detected.

 Next, the operation of the present embodiment will be described.

First, the operation of clamping or unclamping a workpiece by the lateral movement of the feed bars 10, 10 will be described.

The feed bars 10, 10 located at the height for clamping the workpiece are moved to the center in the lateral direction to perform a clamping operation. This clamping operation is performed by transmitting the rotation of the shaft of the clamp motor 36 to the feed screw 32 via the bevel gear 34.

The external thread on the outer surface of the feed screw 32 is a ball screw nut.
The nut 31 meshes with the ball inside, and the nut 31 moves laterally by rotating. Since the nut 31 is integrally fixed to the slide frame 22, the slide frame 22 moves laterally along the slide guide 30.

The up / down rod 20 is held by the slide frame 22, and the front / rear guide 12 supports the feed bar 10 at the upper end of the up / down rod 20, so that the feed bar 10 moves in the lateral direction.

At this time, the external thread of the feed screw 32 or the ball groove inside the nut 31 is a reverse thread in the left and right slide frames 22, 22. 10, 10 will be symmetrical movement.

The unclamping operation is performed in the same manner as described above by rotating the shaft of the clamp motor 36 in the reverse direction.

Next, an up operation or a down operation performed by moving the feed bar 10 in the vertical direction will be described.

With the feed bars 10, 10 clamping or unclamping the workpiece, the up-down motor 44 operates to transmit the rotation of the shaft to the spline rod 38 via the bevel gear 42.

The spline rod 38 rotates the pinion gear 26 meshed by the spline 40, and this pinion gear
Since 26 is engaged with the rack gear 24 of the up / down rod 20, the up / down rod 20 is moved up and down.

At this time, the spline rod 38 can slide in the axial direction while being engaged with the pinion gear 26 by the spline 40, so that the rotational force is transmitted regardless of the position of the pinion gear 26, that is, the position of the slide frame 22. The feed bar 10 can be moved up and down.

By rotating the up / down motor 44 forward or backward, the feed bar 10 can be moved up or down.

Next, a forward operation or a backward operation in which the feed bar 10 moves in the front-rear direction will be described.

In a state where the feed bars 10 and 10 clamp the work (at the time of forward operation) or unclamped (at the time of reverse operation), when the feed motor 72 operates and the motor shaft rotates, the rotation is transmitted to the pulley 68 via the belt 70. The feed screw 66 rotates.

Due to this rotation, the nut 64 of the ball screw works in the front-rear direction, and the slide frame to which the nut 64 is fixed
58 also moves forward and backward. The operation of the ball screw is the same as in the above-described clamp operation or unclamping operation.

When the slide frame 58 moves in the front-rear direction, the slider 54 and the feed pin 16 also move in the front-rear direction. At this time, the slider 54 to which the feed pin 16 is fixed is free to slide in the horizontal direction along the slide guide 56 of the slide frame 58, and the feed bar 10 is free to slide in the vertical direction along the feed pin 16; Regardless of the horizontal position or the vertical position of the feed bar 10, the feed bar 10 can be moved in the front-rear direction.

In the transfer apparatus of the present embodiment as described above, the feed mechanism, that is, the mechanism built in the feed unit 52 employs a ball screw as the driving force transmitting unit, and the clamp mechanism, that is, the clamp up / down unit 18 Since the built-in mechanism for moving the slide frame 22 in the horizontal direction employs ball screws as the driving force transmission unit, compared to the conventional example in which a rack and pinion is employed for these driving force transmission units, Has little backlash. That is, since the backlash is small, the control of the feed motor 72 or the clamp motor 36 composed of a servomotor becomes easy.

Since the play is small, the accuracy of moving the feed bar 10, that is, the feeding accuracy can be increased.

Further, the adjustment at the time of assembly is simple, and the assembly work is facilitated.

Further, the number of parts to be supplied with the lubricating oil is reduced, the amount of the lubricating oil leaking from the transfer device can be reduced, and the working surface can be prevented from being stained with the lubricating oil. That is, the conventional rack and pinion always needs to supply the lubricating oil, and the conventional transfer device having the rack and pinion at many points has to supply the lubricating oil to many points, and the oil leaks from the transfer device. And the working floor was easily soiled. On the other hand, in the present embodiment, a ball screw is employed in place of the rack and pinion. Therefore, lubrication for the ball screw portion is sufficient with grease, and a large-scale oil bath lubrication means is omitted compactly. , 48 are integrated into one unit as shown in FIG. 1 to form a unit. Since this gear case also serves as an oil bath, oil leakage can be prevented.

In particular, in the transfer device, the rack gear portion is long when the feed bar moves, and the entire rack gear portion is not accommodated in the oil bath because it increases the cost of the device.
On the other hand, in the present embodiment, as described above, the leakage of the lubricating oil can be easily prevented, and the working floor is not contaminated.

Further, the conventional clamp motor and up-down motor are of a horizontal type, and project in the lateral direction of the clamp-up / down unit to reduce the work floor area.
On the other hand, the present embodiment is of a vertical type, does not protrude in the lateral direction of the clamp-up / down unit, and does not reduce the work floor area.

In short, the clamp motor and the up-down motor are placed vertically on both the extension ends of the feed bar, and these clamp-up / down drive mechanisms are integrated and housed in the unit housing to form a unit. It became compact.

(Effects of the Invention) As described above, according to the transfer apparatus of the present invention, the feed mechanism for driving the feed bar in the forward and backward directions is housed in the unit housing to be unitized as a feed unit, and the feed bar is formed. Since the clamp-up / down mechanism for driving in the clamp or unclamping or up / down direction is unitized as a clamp-up / down unit, the entire transfer apparatus can be made compact.

In particular, in the clamp-up / down unit, each of the oil baths that accommodates the respective gears of the clamp motor and the up-down motor, while vertically mounting the clamp motor and the up-down motor, respectively, located on both extension end sides of the feed bar. The gear case 46, 48 is divided and housed, and the unit case houses the slide frame, feed screw and spline rod separated from the gear case by a unit housing. Since the motor and the up-down motor main body do not protrude laterally or peripheral devices such as a power transmission belt are installed around the device, the transfer device can be designed neatly and compactly, and the work floor area is reduced. Save space without That. Furthermore, the feed mechanism, such as the feed screw and feed motor behind the feed bar base, is housed and unitized by the feed unit.
There is no possibility that a projecting object obstructing the worker is exposed to the outside.

In addition, one gear case with an oil bath is partitioned so as to hermetically house a gear that transmits the driving force of the clamp motor to the feed screw, and the other gear case with an oil bath transfers the driving force of the up-down motor to the spline rod. The gears for transmitting power are partitioned so as to be hermetically housed, and the unit housing between each gear case is
Since the slide frame, the feed screw, and the spline rod are stored separately from the gear case, oil does not leak from the gear case with the oil bath, and therefore, oil does not leak from the unit housing to the floor.

Further, in the device of the present invention, since the drive system peripheral devices such as the motor and the drive belt do not protrude from the device or are exposed to the outside from the unit housing, and are housed in each unit, the floor surface has oil leakage. It is installed in an orderly manner without soiling, and provides a suitable working environment, and allows the worker to work safely.

Furthermore, since the clamp motor and the up / down motor are provided on the gear case with the oil bath of the clamp up / down unit, the space can be saved without being installed on the floor surface, and the assembling is simple and labor-saving.

In particular, the clamp motor and the up-down motor are installed vertically on the gear case with oil bath of the clamp up-down unit, so there is no need for drive belt peripherals and other driving system peripheral devices, so that parts can be reduced and work is reduced. It is safe without getting in the way.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a transfer apparatus according to one embodiment of the present invention (a sectional view taken along line II of FIG. 2), FIG. 2 is a plan view of the entire embodiment, and FIG. 4 is a side view of FIG. 2, FIG. 5 is a cross-sectional view taken along line VV of FIG. 1, FIG. 6 is an enlarged view of a VI section of FIG. 2, and FIG. It is a front view of a figure. 10, 10 Feed bar 16 Feed pin 18, 18 Clamp up / down unit 20, 20 Up / down rod 22, 22 Slide frame 24, 24 Rack gear 26, 26 Pinion gear 28 ... Unit housing 31,31 ... Ball screw nut 32 ... Feed screw 34,34 ... Gear 36 ... Clamp motor 38 ... Spline rod 42,42 ... Gear 44 ... Up-down motor 45,45 ... Coil cover 46, 48 Gear box with oil bath 52 Feed unit 54 Slider 60 Unit housing 64 Ball screw nut 66 Feed screw 72 Feed motor

Claims (1)

(57) [Claims] 1. A transfer device comprising respective components of a feed bar, a feed unit and a clamp-up / down unit, wherein each of these components is configured as shown in a, b and c below. A transfer device. I. A pair of feed bars 10, 10 provided in parallel with each other along the work transfer direction. B. By providing a ball screw nut 64 that is provided behind the base of the feed bars 10 and 10 and that is screw-coupled to a feed screw 66 disposed in the same direction as the feed bars 10 and 10, the feed bars 10 and 10 can be moved in the front-rear direction. The feed pin 10, 10 is configured to move forward and backward by the feed pin 16 of the slider 54, and the output shaft of the feed bar A feed unit 52 in which a feed mechanism having a feed motor 72 composed of a servomotor horizontally placed so as to be parallel to a step is housed in a unit housing 60. C. Provided in the direction perpendicular to the feed bars 10, 10 near the stretching base and the stretching end of the feed bars 10, 10, a.In a position extending outward from one of the feed bars 10, A gear case 48 with an oil bath, and a clamp motor 36 composed of a servomotor vertically arranged so that the output shaft is directed vertically downward are disposed thereon. One extension part in which the gear 34 at the lower end of the output shaft and the gear 34 at the shaft end of the feed screw 32 described below mesh with each other and are hermetically housed; b.extending outward from the other feed bar 10 In this position, a gear case 46 with an oil bath and an up-down motor 44 composed of a servomotor vertically arranged with the output shaft vertically downward are disposed thereon. Above The other extension portion in which the gear 42 at the lower end of the output shaft of the pull-down motor 44 and the gear 42 at the shaft end of the spline rod 38 described below mesh with each other and are hermetically housed; c. 48, the feed screw 32 and the spline rod 38 whose portions protruding from the following slide frames 22, 22 are covered with a coil cover 45.
A pair of slide frames, which are axially mounted parallel to each other in a stepwise manner along the orthogonal direction, and the feed screw 32 is provided with nuts 31 and 31 of ball screws to be screwed to the feed screw 32 so as to be horizontally movable. The slide frames 22, 22 are provided with rack gears 24, 24 meshing with the pinions 26, 26 provided on the spline rod 38, and the feed bars 10, 22 are provided at the upper ends thereof.
Up / down rod 2 that supports 10 so that it can slide back and forth
The clamp up / down mechanism consisting of an intermediate portion in which 0 and 20 are vertically movably supported by the clamp motor 36, the up / down motor 44 and the up / down rod 2
Clamp-up / down units 18 and 18 housed in the unit housing 28 except for the upper ends of 0 and 20.