JP2000061704A - Workpiece carrying out device for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a workpiece carrying out device for a machine tool capable of dealing with a machine kind having a narrow machining region too, and ensuring a housing space to avoid the large size of a machine main body. SOLUTION: In the case where a workpiece carrying out device 20 for numerically controlled lathe (machine tool), for carrying a machined workpiece W2 mounted on a main spindle 4 between a receiving position A in the lower part of the main spindle 4 and a carrying out position B outside a machining region is composed, the carrying out device is provided with a carrying arm 25 movably arranged so as to form a circular arc between the positions A and B in a carrying plane nearly orthohonal to the axial line of the main spindle 4, a receiving box 26 connected to one end side 25b of the carrying arm 25 to receive the finish machined workpiece W2 from the main spindle 4, an air cylinder 27 (rectilinear drive mechanism) connected to another end side 25a of the carrying arm 25 to rectilinearly move the carrying arm 25 in the carrying plane, and a cam mechanism 28 for converting the rectilinear movement of the carrying arm 25 into circular arc movement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work unloading device for a machine tool for unloading a machined work mounted on a spindle.

[0002]

2. Description of the Related Art For example, some lathes are provided with a work unloading device for automatically unloading a finished work to the outside of the machine so that it can be continuously operated. As a work unloading device of this type, there is a device disclosed in, for example, Japanese Patent Laid-Open No. 4-159002. In the carrying-out device described in this publication, the shaft is arranged parallel to the main axis and is movable in the axial direction between the chuck cover and the processing region, and an arm extending in the direction perpendicular to the axis is fixed to the tip of the shaft. A bucket is attached to the tip of the arm, and the bucket is rotated between the receiving position and the unloading position while advancing and retracting the shaft in the axial direction between the chuck cover and the processing region.

[0003]

However, in the case of the conventional apparatus in which the bucket is rotated while moving in the axial direction, a relatively large size for accommodating the shaft, the bucket, the cylinder mechanism, etc. in the chuck cover. A space is required, and it is difficult to use for models with a small empty space inside the chuck cover.

The present invention has been made in view of the above-mentioned conventional circumstances, and by adopting a structure different from that of the above-mentioned conventional device, it is easy to secure a space for arrangement, and a work which can be adopted even in a small model. It is an object to provide a work unloading device for a machine.

[0005]

According to a first aspect of the present invention, there is provided a work unloading device for a machine tool, which conveys a machined work mounted on a spindle from a receiving position below the spindle to a unloading position outside a machining area. A transfer arm arranged so as to move in a transfer plane that is substantially perpendicular to the axis of the main shaft between the receiving position and the unloading position while drawing a transfer path having a substantially arc shape, and a tip side portion of the transfer arm. Supported on the main shaft and receiving the processed work from the main shaft, and the connecting portion of the base end side portion of the transfer arm is linearly moved within the transfer plane, thereby moving the reception box into an arc along the transfer trajectory. It is characterized by having an arm drive mechanism for moving.

According to a second aspect of the present invention, in the first aspect, the connecting portion of the transfer arm is rotatably and vertically movably supported by the base member, and the arm driving mechanism includes the connecting portion of the transfer arm. And a cam mechanism for converting the vertical movement by the cylinder mechanism into an arcuate movement along the transport locus.

According to a third aspect of the present invention, in the second aspect, there is provided a receiving box tilting mechanism for tilting the receiving box to a discharge angle state in which the work is discharged by moving the transfer arm to the carry-out position. It is characterized by that.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the invention is housed inside a door that opens and closes a working opening formed in a cover that surrounds the machine tool body, and the receiving of the door is performed. It is characterized in that a carry-out opening through which the transport arm and the receiving box can be inserted is formed in a portion facing the position.

[0009]

According to the work unloading device of the machine tool of the first aspect of the present invention, the receiving box at the tip of the transfer arm is moved to the receiving position by linearly moving the base end side connecting portion of the transfer arm. It moves in an arcuate transfer trajectory with respect to the carry-out position. That is, in the device of the present invention, the arm is fixed to the rotating shaft, the receiving box is attached to the tip of the arm, and the arm is rotated while moving the rotating shaft in the main axis direction. Does not need the equivalent of. Therefore, the entire apparatus is compact, the arrangement space is small, the rotation space required to secure the movement of the receiving box can be made small, and it is not necessary to secure the arrangement space in the chuck cover. Therefore, the device of the present invention can be adopted without problems even in a model that is small and has a small arrangement space, an empty space in the chuck cover, and the like.

According to a second aspect of the present invention, a cylinder mechanism for rotatably and vertically movingly supporting the connecting portion of the transfer arm, and vertically moving the connecting portion of the transfer arm, and a vertical mechanism by the cylinder mechanism. Since the cam mechanism for converting the movement into the circular arc movement along the conveyance locus is provided, the operation in claim 1 can be realized.

Further, according to the third aspect of the invention, since the receiving box tilting mechanism for tilting the receiving box to the work discharge angle state by utilizing the movement operation of the transfer arm to the carry-out position is provided, A special power source for tilting can be eliminated, and the structure can be further simplified.

According to the fourth aspect of the present invention, since the device of the present invention is housed inside the door that opens and closes the working opening, the space inside the door can be effectively utilized and the adhesion of cutting chips and the like can be prevented.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 5 are views for explaining a work unloading device for a machine tool according to an embodiment of the present invention. FIGS. 1 and 2 are side views of the work unloading device, and FIG. 3 is a front view of the work unloading device. FIG. 4, FIG. 4, and FIG. 5 are a schematic perspective view and a schematic front view of an NC lathe equipped with a work unloading device.

In FIGS. 4 and 5, reference numeral 1 denotes an NC lathe capable of simultaneously processing both sides of a work. The NC lathe 1 has a work W1 on the left side of the bed 2 when viewed from the front of the machine.
And a work spindle W4 for work W2 are provided on the right side so as to be movable in the Z-axis (horizontal) direction. Has a schematic structure in which it is arranged so as to be movable in the Z-axis and X-axis (front-back) directions.

The left and right spindles 3 and 4 are the works W1 and W, respectively.
The chucks 3a and 4a for gripping the workpiece 2 are provided, and the chucks 3a and 4a are opened and closed by a hydraulic device (not shown) to grip or release the works W1 and W2.

The upper part of the NC lathe 1 is surrounded by a cover 10, and a working opening 10a having an opening width extending over the left and right main shafts 3 and 4 is formed on the front surface of the cover 10. A slide door 11 that opens and closes the left main shaft 3 side portion is provided on the front left side of the opening 10a, and a slide door 12 that opens and closes the right main spindle 4 side portion is provided on the right side. In addition, 14 is an operation panel, and the above-mentioned working opening 10a.
It is located to the right of.

The right slide door 12 has a structure in which an inner panel 12a and an outer panel 12b made of steel plates are joined in the middle, and the working opening 10a of the cover 10 is provided.
It is slidably supported by the door rails 13, 13 arranged at the upper edge and the lower edge. The left slide door 11 has the same structure as the right slide door 12.

Although not shown, the NC lathe 1 is equipped with a work supply device for supplying a long work piece from the left side of FIG. 5 to the left main spindle 3. The tip of the workpiece supplied to the left spindle 3 by this workpiece feeder is gripped by the chuck 3a, and the gripped portion (workpiece W1) is subjected to the required processing by the left spindle 3 and the tool rest 5. To be done. When the machining is completed, the right spindle 4 moves leftward, the chuck 4a grips the tip of the workpiece W1, the chuck 3a unclamps, and the right spindle 4 moves rightward to move the workpiece. The work is pulled out and the chuck 3a grips the work again. In this state, the work W1 is cut by the cut-off of the left tool rest 5 to become a work W2, and the work W2 is subjected to the remaining machining by the right spindle 4 and the tool rest 6.

The processed work W2 is carried out of the machine by the work carrying-out device 20 which is a feature of this embodiment. As shown in FIGS. 1 to 3, the work unloading device 20 mainly includes a transfer arm 25, a receiving box 26 that receives the work W2, an arm drive mechanism 60 including a cylinder mechanism 27 and a cam mechanism 28, and a receiving mechanism. Box tilting mechanism 6
1 and.

The work unloading device 20 is housed inside the second slide door 12, and the arm drive mechanism 60 is attached to a base plate 30 fixed to the inner panel 12a of the right slide door 12. Has been. A linear rail 31 extending vertically is fixed to the base plate 30 by bolts.
A guide 32 is slidably engaged with 1. A connecting shaft 33 is planted in the guide 32 so as to extend in a direction perpendicular to the sliding direction of the guide 32.

The cylinder mechanism 27 is arranged and fixed vertically downward on the upper end of the base plate 30 via a bracket 35. The piston rod 36 of the cylinder mechanism 27 is bolted to the upper surface of the guide 32. It is fastened and fixed. The guide 32 reciprocates linearly along the linear rail 31 as the piston rod 36 moves back and forth.

As shown in FIGS. 1 and 2, the transfer arm 25 has an arcuate shape with its upper and lower portions bent inward, and the connecting portion 2 formed at the upper end of the transfer arm 25.
5a is rotatably connected to the outer protruding portion of the connecting shaft 33 via a bearing 34. As a result, the transfer arm 25 is rotatable about the connecting shaft 33, and the connecting portion 25a is linearly movable in the vertical direction along with the guide 32 along the linear rail 31.

A cam follower 3 which constitutes a guided member of the cam mechanism 28 is provided at the upper bent portion of the transfer arm 25.
8 is attached so that its rotating shaft is parallel to the connecting shaft 33. The cam follower 38 is the transfer arm 2
The roller 40 is rotatably supported on the protruding end of the cam shaft 39 which is bolted and fixed to the shaft 5.

A front view of the transfer arm 25 (see FIG. 3).
On the left side, a cam block 42 that constitutes a guide side member of the cam mechanism 28 is arranged. The cam block 4
2 extends in the vertical direction and is bolted and fixed to the base plate 30 via a fastening bracket 43. A cam groove 42a on which the roller 40 of the cam follower 38 rolls is recessed on the right side surface of the cam block 42 as viewed from the front.
The cam groove 42a moves linearly by the cylinder mechanism 27 to a receiving position A below the right main shaft 4 of the receiving box 26 attached to the tip of the transport arm 25 and a carry-out position B inside the slide door 12. It is for converting into a reciprocating circular arc movement between and. Specifically, the lower part is composed of a straight line portion a that is linearly inclined toward the inside of the machine and a circular arc portion b that is inclined toward the inside of the machine. Rock to.

A shaft 45 extending in parallel with the connecting shaft 33 and protruding leftward and rightward is rotatably supported on a lower end portion 25b of the transfer arm 25 via a bearing 46. The bottom wall of the receiving box 26 is fixed to the right side protruding portion of the shaft 45 when viewed from the front (see FIG. 3). This receiving box 26 is a box-shaped one having a receiving port 26a, and when viewed from the front,
The workpiece W2 held by the chuck 4a of the spindle 4 located at the retracted end is arranged so as to overlap with the workpiece W2. A carry-out opening 12c is formed in a portion of the inner panel 12a facing the receiving box 26. This carry-out opening 1
2c is sized so that the receiving box 26, the shaft 45, and the lower half of the transfer arm 25 can be inserted therethrough.

A first shutter 47 for opening and closing the upper portion of the carry-out opening 12c is attached and fixed to the bottom wall of the receiving box 26 via a bracket 48, and the first shutter 47 has the transfer arm 25. When it is located at the carry-out position B, it is tilted by the receiving-box tilting mechanism 61 and the carry-out opening 1
The upper part of 2c is adapted to be closed.

A second shutter 49 for opening and closing a lower portion of the carry-out opening 12c is attached to the lower side of the carry-out opening 12c via left and right hinge members 50,50. The second shutter 49 is opened to the inside of the machine by its own weight, and when the transfer arm 25 is moved to the carry-out position B, the second shutter 49 is rotated to the closed position by the first shutter 47. In this way, the carry-out opening 12c is closed by the first and second shutters 47 and 49, and prevents cutting oil and cutting debris from entering the door 12.

The receiving box tilting mechanism 61 is provided in the receiving box 2
6, the receiving port 26a is always biased to the receiving angle state in which the receiving port 26a faces upward, and when the transport arm 25 is rotated to the unloading position B, the receiving port 26a is tilted to the unloading angle state in which the receiving port 26a faces the outside of the machine. ing. The inbox 26 is
A coil spring 54 is installed between the pin 52 planted in the receiving box 26 and the pin 53 planted at the tip of the transfer arm 25, so that the receiving angle state is constantly urged.

An arm 56 is provided at the left end of the shaft 45.
Is fixed, and a cam follower 57 is attached to the tip of the arm 56.
Is attached. The cam follower 57 engages with the cam groove 58a recessed in the cam plate 58 when the carrying arm 25 is rotated to the carry-out position B, and tilts the arm 56 and thus the receiving box 26 to the carry-out angle state. It is like this. The cam plate 58 is arranged on the left side of the cam follower 57 and is fixed to the inner surface of the door 12.

Next, the function and effect of this embodiment will be described. In the work unloading device 20 of the present embodiment, when the processing of the work W2 is completed, the piston rod 36 of the cylinder mechanism 27 advances (descends) and lowers the guide 32 along the linear rail 31. Arm 25
The connecting portion 25a of (1) moves linearly downward. Then, the cam follower 38 moves downward and inward along the cam groove 42 a of the cam block 42. As a result, the transport arm 25 is responsive to the amount of inward movement of the cam follower 38 about the connecting shaft 33, the ratio of the arm length from the connecting shaft 33 to the cam follower 38 and the arm length from the connecting shaft 33 to the receiving box 26. The lower end portion 25b and the receiving box 26 move in a plane perpendicular to the axis of the main shaft 4 so as to draw a substantially arcuate trajectory by swinging inwardly by an amount. As a result, the receiving box 26 moves from the carry-out position B in the slide door 12 to the receiving position A below the right spindle 4.

The cam follower 57 disengages from the cam groove 58a of the cam plate 58 as the transfer arm 25 moves in an arc.
As a result, the receiving box 26 is released from the tilted state, and is rotated by the biasing force of the coil spring 54 to the receiving angle state in which the receiving opening 26a faces upward. In addition, the above receiving box 2
The first shutter 47 opens the upper portion of the carry-out opening 12c as the circular arc 6 moves, and the second shutter 4
9 rotates to the inside of the machine by its own weight and opens the lower part of the carry-out opening 12c (see FIG. 2).

When the receiving box 26 is positioned at the receiving position A, the chuck 4a of the right spindle 4 is opened by the hydraulic device,
The processed work W2 falls into the receiving box 26. Then, the piston rod 36 of the cylinder mechanism 27 retracts,
The connecting portion 25a of the transfer arm 25 retracts (raises) together with the guide 32, the cam follower 38 moves upward and outward of the machine along the cam groove 42a, and the lower end portion 2 of the transfer arm 25 moves.
5b retreats so as to form an arc locus in the transport plane, and the receiving box 26 moves to the carry-out position B in the slide door 12 through the carry-out opening 12c.

As the lower end 25a of the transfer arm 25 moves in the door, the cam follower 57 engages with the cam groove 58a of the cam plate 58.
5, the receiving opening 26a is tilted so as to rise up to the carry-out angle state facing the outside of the machine, the processed work W2 is discharged from the receiving box 26, and is passed through a carry-out passage (not shown) to a storage box or the like outside the machine. It is stored.

The receiving box 26 has a receiving position A.
On the other hand, the main shaft 4 enters below the center line c, whereas the carry-out position B stands above the center line c.
Of the lower rail 1 supporting the slide door 12 is high.
The problem of interference with 3 can be avoided.

Further, as the receiving box 26 is tilted to the carry-out angle state, the first shutter 47 is provided with the carry-out opening 12c.
The second shutter 49 closes the lower part of the carry-out opening 12c while closing the upper part of the second shutter 49 upward.

As described above, according to this embodiment, the connecting portion 25a of the transfer arm 25 is linearly moved within the transfer plane, and the linear movement is converted into the reciprocating circular arc movement of the receiving box 26 by the cam mechanism 28. Since the receiving box 26 is tilted to the upright state by utilizing the returning operation of the transfer arm 25 to the unloading position B, the processed work W2 is transferred from the receiving position A to the unloading position B and is paid out of the machine. Can be issued.

In the apparatus 20 of this embodiment, the connecting portion 2
The linear movement of 5a is converted into an arc movement between the receiving position A and the carry-out position B of the receiving box 26, and a rotary shaft in a conventional device is not necessary. It can be made compact and the receiving box 2
The space for rotating 6 is smaller than that of a conventional device that moves in the axial direction of the main shaft, and can be used in a small model without any problem.

Further, in the present embodiment, the work unloading device 20
Is housed in the slide door 12, the empty space in the door 12 can be effectively used, and the arrangement space can be secured more easily than in the case of housing in the chuck cover.

Further, in this embodiment, the movement of the lower end portion 25b of the transfer arm 25 is utilized to make the receiving box 26 the receiving opening 26a.
Since the work piece is tilted to the carry-out angle state in which the work piece is in the horizontal direction, it is possible to realize the receiving, carrying, and the payout operation of the processed work with a simple mechanism.

In the above embodiment, the case where the work unloading device 20 is housed in the slide door 12 has been described, but the arrangement position of the device of the present invention is not limited to the inside of the slide door 12. For example, it may be arranged on the rear wall side of the processing area and carried out to the back side of the machine.

Further, in the above-mentioned embodiment, the case where it is applied to the NC lathe having the first and second spindles has been described, but the applicable range of the present invention is not limited to this type of lathe.

[Brief description of drawings]

FIG. 1 is a side view for explaining a work unloading device for an NC lathe according to an embodiment of the present invention.

FIG. 2 is a side view of the apparatus of the above embodiment.

FIG. 3 is a front view of the apparatus of the above embodiment.

FIG. 4 is a perspective view of the NC lathe.

FIG. 5 is a schematic front view of the NC lathe.

[Explanation of symbols]

1 NC lathe (machine tool) 4 spindles 10 covers 10a Work opening 12 sliding doors 12c carry-out opening 20 Work unloading device 25 Transport arm 25a connection part 26 Inbox 26a opening 27 cylinder mechanism 28 Cam mechanism 30 Base plate (base member) 54 Coil spring (support mechanism) 55 Secondary cam follower (rotating mechanism) 58 Secondary cam block (rotating mechanism) 60 arm drive mechanism 61 Tilt box tilting mechanism A receiving position B carry-out position W2 Processed work

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ikuya Yamanaka             106 Kita-Koriyama-cho, Yamato-Koriyama-shi, Nara Stock             Mori Seiki Co., Ltd. F-term (reference) 3C033 CC03 EE07 HH02 HH16                 3C045 FA05 FB01

Claims (4)

[Claims] 1. A work unloading device of a machine tool for transporting a machined workpiece mounted on a spindle from a receiving position below the spindle to an unloading position outside a machining area, in a transport plane substantially perpendicular to the axis of the spindle. And a transfer arm arranged so as to move along a substantially arcuate transfer path between the receiving position and the unloading position, and a processed workpiece supported by the tip end side portion of the transfer arm and received from the main spindle. And an arm drive mechanism for moving the receiving box in an arc along the transfer trajectory by linearly moving a connecting portion between the receiving box and the base end side portion of the transfer arm in the transfer plane. Characteristic machine tool work unloading device. 2. The connecting part of the transfer arm according to claim 1, wherein the connecting part of the transfer arm is supported by a base member so as to be rotatable and vertically movable, and the arm drive mechanism moves the connecting part of the transfer arm up and down. A work unloading device for a machine tool, comprising: a mechanism; and a cam mechanism that converts vertical movement by the cylinder mechanism into arcuate movement along the transportation locus. 3. The receiving box tilting mechanism according to claim 2, further comprising a receiving box tilting mechanism for tilting the receiving box to a carry-out angle state in which a work is carried out by moving the transfer arm to a carry-out position. Workpiece unloading device for machine tools. 4. The part according to claim 1, which is housed inside a door that opens and closes a working opening formed in a cover that surrounds a machine tool body, and a portion facing the receiving position of the door. A work unloading device for a machine tool, wherein a unloading opening through which the transfer arm and the receiving box can be inserted is formed.