JPH0710442B2 - Machine tool unloader device - Google Patents

Description

The present invention relates to an unloader device for a machine tool, and more particularly to an unloader device for unloading a machined work out of a work area in an NC lathe equipped with a bar feed device. is there.

[Conventional technology]

In an NC lathe that is equipped with a bar feed device and continuously processes bar work, the following unloader device is generally used to receive and carry out the processed work. That is, an arm capable of swinging in the horizontal direction or the vertical direction is provided in a part of the working area of the NC lathe, and a bucket for receiving the processed work is provided at the tip of this arm. According to this method, the arm retracts to a position where it does not interfere with the chuck, the tool, etc. during machining of the workpiece, and swings to receive the workpiece when the machining of the workpiece is completed. The received work is transferred to a work storage bucket that is provided in a part of the work area by swinging the arm again or a work storage bucket that is provided outside the processing machine, and moves the bucket at the end of the arm. It was stored in the work storage bucket by an operation such as turning over.

[Problems to be Solved by the Invention]

However, according to the above-mentioned conventional method, it is only in a part of the processing machine, that is, in the work area of the operator that the processed work is collected and stored. Therefore, the work area is narrowed only by the portion occupied by the work storage bucket, the arm, and the like, and the operability of the NC lathe eventually deteriorates.

In addition, when a work storage bucket is provided in the work area, it is necessary to take the machined work out of the machine after storing a certain amount of machined work. There was a problem that the efficiency deteriorated.

Further, when the work storage bucket is provided outside the processing machine, the storage bucket is set at a position lower than the main shaft, and a chute portion is provided between them to make it difficult to carry out cloth material and square wood for sliding the work inside the chute. However, there is also a problem that it is difficult to prevent the leakage of the cutting agent that scatters during processing because a hole is made in a part of the cover of the machine.

Further, since the processed works are continuously stored in the work storage bucket, there has been a problem that the processed works are easily scratched such that the processed works collide with each other.

The present invention has been proposed to solve the above problems. And its purpose is to provide an unloader device for machine tools that does not narrow the working area of the operator in the processing machine, and thus does not impair the operability of the NC lathe, and also facilitates the processing of cutting fluid and chips and improves the working environment. To provide.

Further, the present invention provides an unloader device for a machine tool that can reliably carry out the work regardless of the shape of the work and can carry the work out of the work area without being damaged by the size and weight of the work. To do.

[Means for Solving the Problems]

The present invention has the following device in order to solve the above problems. That is, an unloader device for a machine tool that receives a workpiece machined by an NC lathe at a machining position and carries it out of the work area, a housing provided on the base of the NC lathe, and a fixed shaft fixed to this housing, A rotary body that has the same axis as the fixed shaft and is rotatably supported, a drive body that rotationally drives the rotary body, and a rotary body centered around the rotary axis of the rotary body that is integrally fixed to the rotary body. An arm that swivels between a work receiving position within the work area and a work unloading position outside the work area, a support rotatably supported at the tip of this arm, and a work provided on this support and processed. The bucket, the fixed shaft, and the support body are provided along an arm that straddles the support body, and when the arm rotates, the support body is transmitted as a rotation in a direction opposite to the rotation direction of the arm, The bucket is an unloader device for a machine tool having a parallel movement mechanism that maintains the same posture and posture as the posture of the arm before turning.

Further, according to the present invention, in the bucket, a fixed bucket is provided at one end of the support body, and a movable box having a substantially box shape is provided inside the fixed bucket so as to penetrate both side surfaces of the fixed bucket. The movable bucket is engaged with a stopper provided on a partition cover for partitioning the work area from the work area when the bucket is moved to a work unloading position outside the work area by turning the arm. By so doing, the work is inclined and the work is dropped.

Further, according to the present invention, when the movable bucket is moved to a work unloading position outside the work area and the movable bucket is engaged with a stopper provided on the partition cover and the movable bucket is inclined, the invention is provided on the partition cover. The work transfer port is closed by the fixed bucket and the movable bucket.

Further, according to the present invention, the parallel movement mechanism includes a fixed sprocket pivotally supported by the fixed shaft, a swing sprocket pivotally supported by the support, and a chain connecting the fixed sprocket and the swing sprocket.

Further, according to the present invention, a work carry-out device for carrying out a work dropped at the work carry-out position to the outside of the machine is provided on the base of the NC lathe.

[Action]

The bar material sequentially extruded by the bar feed device is gripped by the main chuck or the back chuck, processed by various tools of the turret of the tool post, and finally cut by a parting tool. The unloader device rotates the rotating body and the arm with respect to the work to be processed by driving the drive body, and by the rotation of the arm, the bucket is moved to the work receiving position and receives the cut work. is there.

The bucket that has received the processed work turns in the opposite direction this time, and turns to the original standby position, that is, the work unloading position, and carries out the processed work. When the arm turns, the parallel movement mechanism of the present invention transmits the support as a turn in the direction opposite to the turning direction of the arm and maintains the posture of the bucket in the same posture and direction as before the swing of the arm. Also,
When the movable bucket is tilted, the work transfer port provided on the partition cover is closed by the fixed bucket and the movable bucket, so that the cutting agent and the cutting chips generated by the processing can be prevented from entering. Then, the processed work is carried out of the processing machine by the work carry-out device.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows the positioning of the unloader device of the present invention in the NC lathe. In FIG. 1, a general description will be given first.

A spindle stock 100 is provided on the left side of the machine, and a rotatable spindle 102 is pivotally supported by the spindle stock 100. This spindle 102
A main chuck 103 is fixed to the front portion, and the main chuck 103 holds a bar material work W that is extruded by a bar feed device (not shown) from the rear of the headstock 100 in an appropriate size.

A backside chuck 104, which is used when the backside of the work W is processed, is rotatably provided at a position on the spindle axis opposite to the main chuck 103. Further, a tool rest 105 is provided in the vicinity of the back surface chuck 104 and can move in the spindle axis direction and the direction orthogonal to the spindle axis. This turret 105
A turret 106 that can be freely indexed and rotated is connected to the.

And various turning tools attached to this turret 106,
The bar work W held by the main chuck 103 and the back chuck 104 is processed by a rotary tool.

Further, the space between the main chuck 103, the tool post located at the rear end of the spindle axis direction, and the splash guard door 107 is a working area 108 for the operator, and the collet portion of the main chuck 103 is replaced. Operations such as exchanging tools fixed on the turret 106 are performed. The unloader device 1 of the present invention is provided inside the work area 108 behind the cover 101, receives the processed work W _1, and receives the work area 10 from the work area 10.
8 It is a device to carry out. The unloader device 1 includes a housing 2, a rotating body 3, and a driving body 4 thereof.
The arm 5, the bucket 7, the work unloading device 9, and the like. Hereinafter, each mechanism will be described.

First, the housing 2 will be described.

As shown in detail in FIGS. 2, 3, and 4, the housing 2 is fixed to the headstock 100 substantially on the spindle axis and below the spindle 102. The housing 2 is provided with a flange 20 and a hollow columnar portion 22 formed at the tip of the housing protruding forward (to the working area 108 side). In the present embodiment, the hollow cylindrical portion 22 at the tip of the housing is configured to be tilted with respect to the vertical line of the main axis, but it may be parallel. Hollow part 23 in the housing 2
And a through hole 24 are formed, and the hollow portion 23 and the through hole are formed.
24, a fixed shaft 32 is provided so as to penetrate through the hollow cylindrical portion 22 fixed to the cover 34 by bolts 33. The cover 34 has a hollow cylindrical portion with a bolt 38.
Since it is attached to 22, the fixed shaft 32 is ultimately fixed to the housing 2. In the hollow portion 23, a rack 30a is provided at the tip of the rotating body 3 described below.
A rack bar 30 that forms the

Next, the rotating body 3 will be described. The rotating body 3 is the second
As shown in FIGS. 3, 3 and 4, it is fixed to the housing 2 with bolts 25, and the hollow cylindrical portion 22 at the tip of the housing 22.
The rotary shaft 35, the pinion 31, the rack rod 30, the cover 34, and the like installed therein are mainly configured.

The rack 30a of the rack rod 30 provided so as to laterally penetrate through the housing 2 meshes with the pinion 31 provided within the hollow columnar portion 22. On the outside of the fixed shaft 32,
A rotary shaft 35 is rotatably supported by two upper and lower bearings 36, 36 held by the hollow cylindrical portion 22 of the housing 2. The pinion 31 is formed integrally with the rotary shaft 35. The pinion 31 meshes with a rack 30a of a rack rod 30 connected to a piston rod 46 of the cylinder 4 described later. Therefore, when the cylinder 4 is driven,
The piston rod 46 moves back and forth to move the rack 30a and pinion 3
The meshing of 1 causes the pinion 31 to rotate and the rotating shaft 35 to rotate. Reference numeral 37 in FIG. 4 is a plug that closes the through hole 24 at the tip of the housing.

It is the cylinder 4 that is the driving body that drives the rotating body 3 described above. The cylinder 4 is provided behind the cover 101 (on the left side in FIG. 1) and is fixed to the housing 2 by bolts 41 as shown in FIG. As shown in the pneumatic circuit diagram 42 in FIG. 1, the piston rod 46 is moved back and forth by the compressed air supply from the pneumatic source 43 to the a cylinder chamber 44 and the b cylinder chamber 45.

Next, the arm 5 will be described. Arm 5 is the first
As shown in detail in FIG. 2, FIG. 3, FIG. 3 and FIG. 5, it is composed mainly of a revolving arm 50, a support 57, a parallel movement mechanism 12 and the like.

The revolving arm 50 has one end of the revolving arm 50 fixed to the tip of the above-mentioned rotating shaft 35. That is, the outer diameter of the distal end of the rotary shaft 35 protruding above the hollow cylindrical portion 22 of the housing 2 is fitted into the hole 50a formed in one end of the revolving arm 50, and the key 53 prevents the arm 50 and the rotary shaft 35 from rotating. Then, the split arm 51 (FIG. 5) at one end of the swivel arm 50 is tightened with the bolt 52 to more firmly fix the swivel arm 50 and the rotary shaft 35.

The other end of the swivel arm 50 has a hollow protrusion 55 protruding downward.
Has become. A support 57 is rotatably supported in the hollow protrusion 55 by two bearings 56, 56. The support body 57 is provided so as to penetrate the hollow protruding portion 55 and further extend to the vicinity of the work unloading position 109 above. The bearings 56, 56 are axially fixed to the hollow protrusion 55 with a cover 58 and bolts 59.

The parallel movement mechanism 12 is provided between the fixed shaft 32 and the support 57. The parallel movement mechanism 12 keeps the support 57 and the swing sprocket 60, and thus the bucket 7, always in the same posture and the same direction. And
It is composed of a support 57, a swing sprocket 60, a fixed sprocket 64, a chain 63, and the like. The swivel sprocket 60 is located on the key 6 on a part of the support 57 (immediately above the swivel arm 50) extending upward from the hollow protrusion 55 of the swivel arm 50.
1. Fixed by set screw 62. Therefore, the support 57 and the turning sprocket 60 can rotate integrally. A fixed sprocket 64 is connected to the orbiting sprocket 60 via a chain 63. The fixed sprocket 64 has a key 6 at the end of the fixed shaft 32 described above.
5 、 Fixed by set screw 66. Consider the movement of the fixed sprocket 64 and the swing sprocket 60. When the rack rod 30 moves back and forth, the rack 30a and the pinion 3
By meshing with 1, the rotating shaft 35 rotates and the revolving arm 50 revolves. The center of this turn is the fixed shaft 32
And the fixed sprocket 64. On the other hand, the swivel sprocket 60 is rotatable with the support 57, and therefore the fixed sprocket 64 and the swivel sprocket 60 are chained.
When connected with 63, the chain will rotate as the swing arm 50 rotates.
The meshing between 63 and the turning sprocket 60 is changed, and the turning sprocket 60 turns in the direction opposite to the turning direction of the turning arm 50. That is, the turning sprocket 60 and the support 57 always maintain the same posture and the same direction. Incidentally, 67 is an arm cover for protecting the revolving arm 50.

Next, the bucket 7 will be described.

As shown in FIGS. 1 to 3, the bucket 7 is composed of a fixed bucket 70, a movable bucket 72, a spring bracket 75, a tension coil spring 76, spindles 73, 73 and the like as main elements. The bucket 7 is connected to the above-mentioned arm 5 and is connected to the main chuck 103 on the chuck center line.
Or swivel up to the bottom of the backside chuck to process the processed workpiece.
Again pivoted into the working area outside the work unloading position 9 side receives the W _1, a mechanism for unloading the machined workpiece W _1.

First, the fixed bucket 70 is a bracket formed in a substantially L shape.
It is fixed to the support 57 described above so as to keep it horizontal by 71. This fixed bucket 70 is viewed from the front (second
In a side view (FIG. 3), the side plates are formed in a slender shape having different heights in the vicinity of the center of the entire length. The bottom plate on the side plate side, which is high in side view, is in a removed state.

Inside the fixed bucket 70, a substantially box-shaped movable bucket 72 whose upper side and front side (left side in FIG. 3) are opened is provided so as to penetrate both side surfaces of the fixed bucket 70 and both side surfaces of the movable bucket 72. It is rotatably provided by the supported support shafts 73, 73. The bottom plate 72a of the movable bucket 72 is provided so as to extend forward and is opened.When the movable bucket 72 is horizontally accommodated in the fixed bucket 70, the bottom plate 72a of the movable bucket 72 is fixed to the fixed bucket 70. The bottomless part is covered. A spring hook screw 74 and a spring hook bracket 75 are attached to the lower sides of the fixed bucket 70 and the movable bucket 72 on one side. Then, a tension coil spring 76 is hooked between the spring mounting screw 74 and the spring mounting bracket 75.

An L-shaped stopper 77 is attached downward to the bottom plate 72a of the movable bucket 72. The L-shaped stopper 77 is adapted to engage with a bucket opening stopper 78 attached to the cover 101 and extending to the vicinity of the bottom of the fixed bucket 70. Then, when the L-shaped stopper 77 of the movable bucket 72 abuts on the stopper 78 of the cover 101 when the bucket 7 is swung back and returned, the movable bucket 72 causes the movable bucket 72 to rotate.
Raise the hips with 3 as the fulcrum. By this series of movements, the machined work in the movable bucket 72 is processed.
W ₁ is sent to the work unloading device 9. Further, a stopper plate 70a is provided in front of the fixed bucket 70 so as to prevent the movable bucket 72 and the fixed bucket 70 from further advancing, and the position thereof by hitting an adjustable stopper 93 mounted on a hopper 90 described later. Will stop at.

Here, a mechanism for returning the movable bucket 72 whose one end is lifted will be described. When the L-shaped stopper 77 fixed to the movable bucket 72 and the stopper 78 fixed to the cover 101 are disengaged, the movable bucket 72 returns downward by its own weight with the support shafts 73, 73 as the fulcrum. The holding and tension coil springs 76 also act to shorten the spring length "a" dimension, and thus cooperate with the movable bucket to return to the horizontal position. Reference numeral 79 is a spring protection plate for protecting the tension coil spring, which is fixed to the side surface of the movable bucket 72.

Further, when the length of the main chuck used or the length of the work is changed, the mounting positions of the fixed bucket 70 and the movable bucket 72 can be changed so as to cope with the change. That is, as shown in FIG. 3, for example, when the length of the main chuck 103 becomes long, when the bolt 82 is loosened, the bolt penetration hole of the bracket 71 becomes a long hole in the longitudinal direction. The mounting position of the longitudinal direction may be shifted and the bolt 82 may be fixed again.

FIG. 3 shows a state in which the processed workpiece W ₁ is sent from the movable bucket 72 to the workpiece unloading device 9, while this state is the standby state of the bucket 7 during the workpiece processing ( In-situ). In this state,
The bucket 7 is inside a protective frame 80 that is provided so as to project from the cover 101 toward the work area 108 side, and is protected from coolant, cutting chips, and the like during processing of the work. Reference numeral 81 is a brush attached in front of the protective frame 80.

Next, the work unloading device will be described.

The work unloading device 9 includes a hopper 90, a belt conveyor 91, and a hopper 90 as shown in FIGS. 1, 2, 3, and 6.
The conveyor supporting bracket 92 and the like are main components. The work unloading device 9 is a mechanism that conveys the processed work W ₁ received from the bucket 7 to the outside of the processing machine.

The hopper 90 is provided behind the cover 101 and is located below the fixed bucket 70 that constitutes the bucket 7 described above. The bottom of the hopper 90 is formed in an inclined shape that descends toward the belt conveyor 91 so that the processed work W ₁ can smoothly flow to the belt conveyor 91. A belt conveyor 91 is fixed to a part of the processing machine by a conveyor support bracket 92 so that the belt conveyor 91 faces the conveying direction in the main axis direction so as to contact the end of the inclined bottom of the hopper 90. The belt conveyor 91 is generally used and extends from below the hopper 90 to outside the processing machine. Then, the processed work W ₁ is carried out to a finished product feeder or the like (not shown) outside the processing machine.

Next, the operation of the unloader device 1 of the present invention configured as described above will be described.

Bar material work W is headstock 100
It is fed from the rear and gripped by the main chuck 103.
The bar material work W is subjected to predetermined processing by various tools mounted on the turret 106. If backside processing is required, use the backside chuck 104 to process, and after processing,
The unloader device 1 is operated for the processed work. That is, first, compressed air is supplied to the a-cylinder chamber 44 of the driving body 4 to advance the piston rod 46. The forward movement of the rack rod 30 connected to the piston rod 46 causes the pinion 31 to rotate, and the revolving arm 50 fixed to the pinion 31 starts to revolve.

As the revolving arm 50 revolves, the bucket 7 also moves from the standby position. At this time, the tip of the bottom plate 72a of the movable bucket 72 hits the stopper 78 attached to the cover 101, and the movable bucket 72 in a state where the whole is obliquely lifted with the support shafts 73, 73 as the fulcrum, Return to the original horizontal direction. Subsequently, the revolving arm 50 is revolved, and the fixed bucket 70 and the movable bucket 72 are swayed to below the chuck on the center axis of the main chuck 103 or the back chuck 104. Since the fixed bucket 70 and the movable bucket 72 are synchronized with the swing of the swing arm 50 by the parallel motion mechanism 12 in which the fixed sprocket 64 and the swing sprocket 60 are connected by the chain 63, the fixed bucket 70 and the movable bucket 72 are swung onto the chuck center line in the standby state. Be done.

Main bucket with fixed bucket 70 and movable bucket 72
When the machined workpiece W ₁ is received from 103 or the back chuck 104, compressed air is supplied to the b cylinder chamber 45 and the operation opposite to the above, that is, the operation of retracting the piston rod 46 and the rack rod 30 is performed. Etc. are swung to the work unloading device 9 side.

The fixed bucket 70 and the movable bucket 72 that have received the processed work W ₁ are fixed sprocket 64 on the fixed shaft 32 side,
A parallel motion mechanism in which a swivel sprocket 60 on the support 57 side is connected by a chain 63 allows the work unloading device 109 to enter the protective frame 80 while maintaining its posture. Then, the L-shaped stopper 77 attached to the movable bucket bottom plate 72a becomes the stopper 7 attached to the cover 101 of the machine.
It hits 8 and fixed bucket 70 and movable bucket 7
When 2 is turned, the turning force about the turning arm axis is
As a result of the turning power being changed with 73 as a fulcrum, one end of the movable bucket 72 is lifted. By this operation, the processed work W ₁ stored in the movable bucket 72 is transferred to the movable bucket bottom plate.
It rolls down from 72a and is transferred to the hopper 90 of the work unloading device 9. The processed work W ₁ slides down the inclined surface of the hopper 90, is transferred to the belt conveyor 91, and is conveyed to the outside of the processing machine by the belt conveyor 91. During this time, in the working area 108, the bar material work W as described above is processed. After that, the same operation is repeated.

As described above, according to the present embodiment, the fixed and movable buckets containing the processed work are swiveled to the work unloading position provided outside the area of the cover partitioning the work area,
At that position, the processed work is delivered to the belt conveyor and is in a standby state. Also, since the housing and swivel arm are provided under the chuck, it does not require much space and does not narrow the working area of the operator, so it does not affect the operability of the NC lathe.

In addition, the fixed and movable buckets swing the longitudinal direction under the chuck to receive the work, and swivel to the work carry-out position in the posture as it is, so that the processed work can be carried out even in a narrow space.

Further, since the processed works are carried out one by one on the belt conveyor to the outside of the processing machine, the processed works do not collide with each other and are not damaged. In addition, even if the work is carried out of the processing machine, a work delivery port is provided in the direction in which the cutting agent and chips are less likely to scatter, and the fixed bucket, movable bucket, etc. at the standby position deliver the work during cutting. With a structure that closes the mouth, leakage of cutting fluid and chips is eliminated, and the working environment is improved.

The housing is not limited to this embodiment, but may have a welded structure or a rotary cylinder. Further, the driving source of the driving body may be hydraulic pressure.

〔The invention's effect〕

Since the present invention is configured as described above, the following effects are produced.

That is, the processed work is transferred to the bucket every time the processing is completed, and is transferred from the bucket to the work unloading device. Then, the processed work is carried out of the machine by the work carrying-out device.

Therefore, the processed workpieces do not collide with each other and the scratches on the workpieces are eliminated.

In addition, since the processed work is carried out of the machine each time, when the processed work is full in the work storage bucket inside the machine, wasteful time such as stopping the machine and taking out the processed work is omitted. it can. As a result, the machine can be operated continuously and the production efficiency is improved.

Further, since the work unloading device is outside the work area of the operator, the bucket also stands by outside the area of the cover partitioning the work area, and the housing and the arm are located at the end of the work area below the chuck, so that the cutting agent and The processing of chips is easy,
The work area is not narrowed and the operability of the NC lathe is not impaired.

Further, since the bucket rotates to the position of the work unloading device while receiving the processed work, if the longitudinal direction of the bucket is oriented in the main shaft axis direction, work with a relatively long axial dimension can be performed even in a narrow space. Can now be carried out.

In order to mount the unloader device of the present invention, it suffices to carry out a partial improvement work for mounting the housing below the main shaft and the work unloading device to the cover outside the working area in the machine. It can also be attached to.

According to the unloader device of the second aspect, when the bucket receives the processed work and turns to the carry-out position, the bucket can be tilted. It can be transferred to the work unloading device smoothly regardless of size and weight. Therefore, the processed work does not remain in the bucket, and the bucket always waits in an empty state until the next work is received. Therefore, the processed workpieces do not hit each other and get damaged,
The processing efficiency can also be improved.

According to the unloader device of the third aspect, the work transfer port is provided in the direction in which the cutting agent is less likely to be scattered, and the work transfer port is closed by the unloader bucket itself during cutting (while the unloader device is on standby). Therefore, the working environment was improved without the cutting agent leaking.

According to the unloader device of claim 4, since the parallel movement mechanism for maintaining the posture of the bucket in the same direction when the arm is rotated is constituted by the chain and the sprocket, the device is simple and inexpensive. It is also economically advantageous.

According to the unloader device of claim 5, since the work unloading device for receiving the processed work carried by the bucket and carrying it to the outside of the machine is mounted in the NC lathe, the projecting portion is reduced and therefore the operator's operation is reduced. It did not get in the way, and the overall appearance improved.

[Brief description of drawings]

1 to 6 each show an embodiment of the present invention. FIG. 1 is an overall plan view of an unloader device, FIG. 2 is a partial sectional front view of the unloader device, and FIG. 3 is a side view of the same. 4, FIG. 4 is a view on arrow I in FIG. 2, FIG. 5 is a sectional view taken along line II-II in FIG. 2, and FIG. 6 is a sectional view taken along line III-III in FIG. In the figure, 1 ... unloader device, 2 ... housing, 3 ... rotating body, 4 ... driving body, 5 ... arm, 7 ... bucket, 9 ... workpiece unloading device, 12 ... parallel motion mechanism, 30a …… rack, 31 …… pinion, 35 …… rotating shaft (rotating member), 46 …… piston rod, 50 …… swivel arm, 57 …… support, 60 …… swivel sprocket, 64 …… fixed sprocket, 70 …… Fixed bucket, 72 …… Movable bucket, 73 …… Stopper, 90 …… Hopper, 91 …… Belt conveyor, 100 …… Spindle head, 101 …… Cover, 103 …… Main chuck, 104 …… Rear chuck , 108 …… Work area, 109 …… Work unloading position.

Claims (5)

[Claims] 1. An unloader device for a machine tool, which receives a workpiece machined by an NC lathe at a machining position and carries it out of a work area, the housing being provided on a base body of the NC lathe, and a fixing fixed to the housing. A shaft, a rotating body that has the same axis as the fixed shaft and is rotatably supported, a driving body that drives the rotating body to rotate, and a rotation axis of the rotating body that is integrally fixed to the rotating body. The arm that swivels between the work receiving position in the work area and the work unloading position outside the work area, the support rotatably supported at the tip of the arm, and the work provided on the support. A bucket for receiving the work, the fixed shaft and the support body are provided along the arm straddling the support body. When the arm pivots, the support body pivots in a direction opposite to the pivot direction of the arm. Reportedly unloader device for a machine tool comprising a posture of the bucket from the parallel motion mechanism to maintain the same posture and before rotation of the arm, in the same direction. 2. A support shaft according to claim 2, wherein a fixed bucket is provided at one end of the support, and a substantially box-shaped movable bucket is provided inside the fixed bucket so as to penetrate both side surfaces of the fixed bucket. Can be tilted by
When the bucket is moved to the work unloading position outside the work area by the rotation of the arm, the movable bucket is inclined by engaging with a stopper provided in a partition cover that partitions the work area from the outside of the work area. The unloader device for a machine tool according to claim 1, wherein the work is dropped. 3. The partition cover is provided when the bucket moves to a work unloading position outside the work area, and the movable bucket is tilted by engaging the movable bucket with a stopper provided on the partition cover. The unloader device for a machine tool according to claim (1) or (2), wherein the work transfer port is closed by the fixed bucket and the movable bucket. 4. The parallel movement mechanism comprises a fixed sprocket pivotally supported by the fixed shaft, a revolving sprocket pivotally supported by the support, and a chain connecting the fixed sprocket and the revolving sprocket. ) A machine tool unloader device as described above. 5. The unloader device for a machine tool according to claim 2, wherein the workpiece unloading device for unloading the workpiece dropped at the workpiece unloading position is provided on the base of the NC lathe.