JP2001150286A - Workpiece conveying apparatus for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a workpiece conveying apparatus with a safety cover for a machine tool. SOLUTION: A cover C entirely covering at least the workpiece conveying area, workpiece holding area and machining area of a machine tool is formed of a frame and wall panels, and rails 4 and 7 are laid in parallel and vertically stepped relationship between the workpiece conveying area and the workpiece holding area on portions 2 and 6 of the frame forming the cover. A workpiece conveying base 11 is provided to be suspended from the higher rail 4 and travel while being supported by the lower rail 7. Workpiece gripping portions 16 and 17 and a workpiece gripping portion lifting means 15 are provided on the workpiece conveying base in such a way as to be moved horizontally in a direction perpendicular to the direction of travel of the workpiece conveying base in the workpiece conveying area R. A conveyor V is provided in the position of the moving end of the workpiece gripping portions and the workpiece gripping portion lifting means which is perpendicular and horizontal with respect to the direction of travel of the workpiece conveying base in the workpiece conveying area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work loading / unloading device for a machine tool, and more particularly to a work loading / unloading device for a work headstock and a tailstock.

[0002]

2. Description of the Related Art A conventional machine tool, for example, a work loading / unloading device for a grinding machine will be described with reference to FIGS. In a grinding machine in which a front table and a rear grindstone D are provided on a bed B, and a work headstock S and a tailstock T are provided on the table so as to face each other in the X-axis direction, A carry-in / out station R is provided adjacent to the bed B on the headstock S side.

Further, on the front side of the grinding machine, that is, on the worker side,
Adjacent to the grinding machine, a conveyor surface of a conveyor belt having a conveying surface substantially at the height of the table and running along the main spindle axis L (X-axis direction) along the grinding machine is provided. In the grinding machine, a cover Ca having a plate material structure is provided on the bed B in order to prevent scattering of the grinding fluid and the like and to ensure work safety.

The cover Ca covers the table area, and the cover C
A grindstone head cover E that covers the grindstone head D that advances and retreats in the Z-axis direction perpendicular to the X-axis direction is connected to the back surface of a, and the boundary wall between them is missing, so that the cover Ca and the grindstone head cover E are the same. It forms a space. That is, it is possible to feed the cutting wheel to the table side where the grinding wheel G enters the space of the cover Ca. Note that the wheel head cover E is narrower than the cover Ca.

The work loading / unloading device is configured as follows. On the rear side of the bed B of the grinding machine, that is, on the opposite side of the conveyor V, both ends of the bed B in the longitudinal direction are appropriately raised above the grinding machine, and thick struts 51 are erected on the floor surface. A horizontal girder 53 in the X-axis direction is erected on the top via brackets 52, 52. On the upper surface of the horizontal girder 53, rails 55, 55
Is installed.

A traveling body 56 mounted on the rails 55, 55 is provided with a rotatable pinion that meshes with the rack 54, and has a driving motor 57 mounted thereon. The rotating shaft of the pinion and the driving motor 57 And is connected via a bevel gear mechanism. Further, a guide support rod 58 reaching above the transport conveyor V extends from the traveling body 56 in a horizontal Z-axis direction orthogonal to the transport direction of the transport conveyor V, and the guide support rod 58 includes a moving body 59. Are slidably provided in the Z-axis direction.

The moving body 59 is provided with an elevating rod 60 which is slidable in the up-down direction (Y-axis direction). The lower end of the elevating rod 60 is indexed around a rotation axis in the X-axis direction. A rotating gripping head 61 is mounted. The gripping head 61 has gripping claws 62 so as to grip a workpiece W extending in the X-axis direction, and two pairs of the gripping claws 62 are provided in a radial direction at right angles to each other, and a forward position facing the work. And a lower position facing downward and a rearward position facing the cross beam 53.

The support 51 of the work loading / unloading device includes a cover C
a. When the lifting rod 60 is positioned on the main work axis in the Z-axis direction, the cover Ca is provided above the bed B so that the gripping head 61 that has gripped the workpiece W can penetrate the cover Ca and move up and down. A work carrying port 64 provided with a door 63 that can be opened and closed is formed.

[0009] A cover Cb for a work carrying-in / out device for shielding the work carrying-in / out device is provided for safety of a worker standing in front of the conveyor V. The cover Cb is formed such that the front side surface of the cover Ca located between the conveyor V and the bed B extends upward. That is, the cover Cb
Extends upward until it reaches just below the guide support rod 58,
The guide support rod 58 extends upward to an appropriate height further before the front end of the guide support rod 58 with a step so as not to interfere with the movement of the guide support rod 58 in the X-axis direction.

The stepped portion Cb1 overhanging above the worker's head has a movable body 59 and a lifting / lowering rod 60 at least at a position behind the headstock S in the X-axis direction.
The Z-axis direction is opened so that the workpiece W can be carried in and out above. In the loading / unloading of the workpiece by the grinding machine, the door 63 of the workpiece loading / unloading port 64 of the workpiece loading / unloading cover Ca is in an open state, and the door 63 is closed during the grinding after loading / unloading of the workpiece. State.

In the above-described work loading / unloading device, first, the traveling body 56 is located on the loading / unloading station R, and the moving body 59 is at the forward end position, that is, the elevating rod 60, that is, the gripping claw 62 is transported. Unprocessed workpiece W on conveyor V
Is driven forward by the driving motor 50 for driving the vehicle to a position directly above the vehicle. Then, the lifting rod 60, that is, the gripping claw 62
Is moved down by a motor for lifting and lowering mounted on the moving body 59, and grips the unprocessed workpiece W on the conveyor V by rotating the gripping head 61 and opening and closing one gripping claw 62. From the motor for lifting drive.

Then, the moving body 59 is moved backward by the driving of the traveling drive motor 50 to the backward end position. That is, the moving body 59
And the lifting rod 60 comes out of the stepped part Cb1, and the gripping claw 62
This is a position where the unprocessed workpiece W gripped by the workpiece can be on the main axis of the workpiece. Next, the traveling body 56 travels on the table in the X-axis direction by the drive of the traveling drive motor 57, and the unprocessed workpiece W gripped by the gripping claws 62 is moved by the work headstock S and the tailstock T. And above the workpiece mounting position.

The lifting rod 60, that is, the gripping head 61, is lowered by the motor for lifting and lowering through the work loading / unloading port 64, and at this time, the vacant gripping claw 62 is opened and closed to open and close. While holding the finished workpiece W, the gripping head 61 is rotated by a predetermined angle, and the processed workpiece W is removed from between the work headstock S and the tailstock T, and the unprocessed workpiece W is removed. The gripping claws 62 holding the W are opened, and the unprocessed workpiece W is held between the work headstock S and the tailstock T.

The lifting rod 60, that is, the gripping head 61, is lifted up through the work entrance 64 by a motor for driving up and down, and the door 63 of the work entrance 64 is closed. Then, the grinding wheel head D moves forward and the workpiece W is ground by the grinding wheel G, and the traveling body 56 travels on the table in the X-axis direction by driving of the traveling driving motor 57. The traveling body 56 is located on the loading / unloading station R, and the moving body 59 is at the forward end position, that is, the lifting rod 6.
0, that is, the gripping head 61 is moved forward by the drive of the traveling drive motor 50 to a position immediately above the transport conveyor V.

The lifting rod 60, that is, the gripping head 61, is lowered by a motor for driving the lifting and lowering, and the rotation of the gripping head 61 and the release of the gripping claws 62 gripping the workpiece W cause the processed workpiece W Is placed on the conveyor V. The processed workpiece W is carried out by the traveling of the conveyor V, and the next unprocessed workpiece W is carried in. Thus, the mounting and dismounting of the workpiece W with respect to the grinding machine are repeated.

[0016]

The above-described prior art apparatus for loading and unloading a workpiece of a grinding machine has the following problems. (1) Since the work holding / transporting means is supported by two pieces, the high and thick columns 51, 51 requiring strength are erected on the floor surface, so that the required floor area is widened and the columns themselves are also expensive. .

(2) In addition to the cover Ca for preventing the scattering of the grinding fluid and the like and the work safety, a cover Cb for shielding the work gripping and conveying means for the safety of the operator is separately provided in a vertical relationship. Therefore, it becomes a double structure and a useless part occurs,
In addition, a gap or the like is formed in a connection portion between the two, and there is a problem in safety.

(3) The guide supporting rod 5 reaching above the conveyor V from the traveling body 56 in the work holding and conveying means.
8 extends in the horizontal Z-axis direction orthogonal to the transport direction of the transport conveyor V, that is, toward the worker, and the guide support rod 58 supporting the moving body 59 travels in the X-axis direction together with the traveling body 56. The cover Cb also protrudes toward the worker, and the worker moves away from the grinder by the protruding amount, resulting in poor workability and a large space occupied by the cover Cb.

(4) Guide support rod 5 for supporting moving body 59
Numeral 8 is a cantilever beam, which is weak in rigidity, so that vibration or the like occurs during traveling, and the traveling speed of the guide support rod 58, that is, the traveling body 56 is limited.

(5) The cross beam 53 becomes thick because the rails 55 and 55 are placed with the rack 54 interposed therebetween, and the thick horizontal beam 53 is located above the grinding wheel of the grinding wheel stand. It will be an obstacle for replacement. SUMMARY OF THE INVENTION The present invention provides a work loading / unloading device for a machine tool that solves the above-mentioned problem.

[0021]

According to a first aspect of the present invention, there is provided a work loading / unloading device for a machine tool which includes at least a work loading / unloading area, a work holding area, and a processing area of a machine tool. The surrounding cover is formed from a frame and a wall plate,
Rails are laid in parallel in a part of the frame forming the cover between the work carrying-in / out area and the work holding area, and the work carrying-in / out area, the work holding area, and the processing area are straddled over the rail. The workpiece carrier is placed so as to travel on the workpiece carrier, and the workpiece carrier is provided with a workpiece gripper and a workpiece gripper elevating means, and the workpiece gripper of the workpiece transporter is provided with a workpiece gripper. It is provided on the work carrier so as to be moved horizontally at right angles to the traveling direction of the work carrier in the carry-in / out area. The work loading / unloading area is, for example, a work stocker or a conveyor.

In another form, a cover that entirely surrounds at least the work carrying-in / out area, the work holding area, and the working area of the machine tool is formed of a frame and a wall plate, and the cover is formed. Rails are laid on a part of the frame that moves between the work loading / unloading area and the work holding area in parallel and with a vertical step, and are suspended from the high position rail and supported by the low position rail. The workpiece carrier is provided so that the workpiece gripper and the workpiece gripper elevating means are moved horizontally at right angles to the traveling direction of the workpiece carrier in the workpiece loading / unloading area. It is provided on the carriage.

A transfer conveyor is provided at a moving end position of the work holding portion and the work holding portion elevating means in the work loading / unloading area, which is horizontal at right angles to the traveling direction of the work transfer table.

[0024] In any of the above-mentioned types, the work carrier includes a first traveling plate traveling along parallel rails,
A second traveling plate supported and guided on the first traveling plate so as to be able to travel in a horizontal direction perpendicular to the laying direction of the rail, and supporting a workpiece gripping portion and a workpiece gripping portion elevating means; (2) The traveling plate has a retracted end position where the workpiece gripper and the workpiece gripper elevating means are located between the parallel rails, and a forward end that passes below the high-level rail and protrudes forward of the high-level rail. It travels between the positions.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A machine tool according to an embodiment of the present invention, for example, a work loading / unloading device for a grinding machine will be described with reference to the drawings. In the embodiment of the present invention, a front table and a rear grindstone D are provided on a bed B,
Further, in the grinding machine in which the work headstock S and the tailstock T are provided on the table so as to face in the X-axis direction, a carry-in / out station R is provided adjacent to the bed B on the work headstock S side of the table. ing. The grinding machine is provided with a cover C formed of a frame structure and a wall plate on the bed B in order to prevent the scattering of the grinding fluid and the like and to ensure work safety.

A first embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3. The cover C which covers the table area and the loading / unloading station R is provided with the machine spindle axis L
In the direction (X-axis direction), the table area and the width of the loading / unloading station R are set, and the height is a rectangular parallelepiped that is high enough to allow a work loading / unloading device to be described later to be provided above the grindstone table D. An upper first space H1 and an upper second space H2 in the traveling area of the work loading / unloading device are formed.

On the back surface of the portion of the cover C where the first space H1 is formed, a grinding wheel head D which moves back and forth in the Z-axis direction perpendicular to the X-axis direction is provided.
Are combined, and the boundary wall between them is missing, so that the cover C and the wheel head cover E form the same space. That is, the grinding wheel G is in the first space H
The cutting feed to the table side which enters into 1 is possible. Note that the wheel head cover E is narrower than the cover C, and is appropriately lower than the portion of the cover C where the first space H1 is formed.

In the frame of the cover C, horizontal frames are respectively provided between the upper ends of the upright frames 1, 1 at the front ends of the first space H1 and between the upper ends of the upright frames 5, 5 at the rear ends. A first rail 4 and a second rail 7 are laid on the upper surfaces of the member 2 and the horizontal frame member 6. As shown in FIGS. 2 and 3, a first traveling plate 11 of an appropriate length that runs in the X-axis direction with rollers is mounted on the first rail 4 and the second rail 7.

On the upper surface of the first traveling plate 11, on both side edges, third rails 12, 12 parallel to a direction (Z-axis direction) perpendicular to the longitudinal direction (X-axis direction) are laid. Between the rails 12, an elongated hole 1 in the Z-axis direction having an appropriate width.
3 are formed penetrating vertically. The second traveling plate 14 with rollers is mounted so as to be able to travel in the Z-axis direction across the third rails 12 and 12.

An elevating rod 15 is provided on the second traveling plate 14 so as to be slidable in the vertical direction (Y-axis direction), and is provided at a lower end portion of the elevating rod 15 passing through the elongated hole 13 of the first traveling plate 11. The center of the exchange arm 16 is pivotally supported so as to rotate around the rotation axis in the X-axis direction.
Gripping claws 17, 17 which open and close so as to grip a workpiece W extending in the axial direction are attached. The loading / unloading station R is, for example, a stocker or a conveyor running in the Z-axis direction.

The first traveling plate 11 and the second traveling plate 14 include:
Motors 18 and 19 for driving the traveling are provided, and a motor 20 for driving the elevating and lowering rod 15 and a motor for rotating the exchange arm and opening and closing the gripping claw are provided on the second traveling plate 14. 1st running plate 11 and 2nd running plate 14 and elevating rod 15
Is driven or moved up and down by respective drive motors 18, 19 and 20 via a bevel gear mechanism and a rack and pinion mechanism.

The motors 18 and 19 for running drive, the motor 20 for driving up and down, and the motor for rotating the replacement arm and opening and closing the gripping claws are connected to an external control device (not shown) by a cable 3.
0. On the front side of the grinding machine, that is, on the worker side, the upper and lower sides of the cover C are upper and lower dimensions between the horizontal frame member 2 and the table, and a quadrilateral having an appropriate lateral dimension between the headstock and the tailstock. An operation opening 31 is formed, and a sliding door-shaped opening / closing door 32 is provided therein.

In the above-mentioned work carrying-in / out device, first, the first traveling plate 11 is located on the carrying-in / out station R, and the second traveling plate 14 is provided with the lifting rod 15, that is, the gripping pawl 17.
Is located just above the unprocessed workpiece W on the loading / unloading station R. Then, the lifting rod 15, that is, the gripping pawl 17 is lowered by the motor 20 for driving up and down, and the unprocessed workpiece W at the loading / unloading station R is moved by the rotation of the exchange arm 16 and the opening / closing of one gripping pawl 17. To grip.

The lifting rod 15, that is, the gripping pawl 17,
After being raised by the lifting drive motor 20, the second travel plate 14 is moved in the Z-axis direction by the drive of the travel drive motor 19, and the first travel plate 11 is further moved by the travel drive motor 18. By driving, the workpiece W travels on the table in the X-axis direction, and the unprocessed workpiece W gripped by the gripping claws 17 is located above the workpiece mounting position between the workpiece headstock S and the tailstock T. .

Next, the elevating rod 15, that is, the gripper 17 is
It is lowered by the motor 20 for raising and lowering, the vacant gripping claw 17 is opened and closed to grip the processed workpiece W, and the replacement arm 16 is rotated by a predetermined angle, so that the processed workpiece W is rotated.
Is removed from between the work headstock S and the tailstock T, the gripping claws 17 holding the unprocessed work W are opened, and the unprocessed work W is removed from the work headstock S and the tailstock T. Held between.

After the lifting rod 15, that is, the gripping pawl 17 is raised by the motor 20 for lifting and lowering, the first traveling plate 11
Is driven in the X-axis direction to the left end of the table by the drive of the drive motor 18, and the first traveling plate 11 is located on the carry-in / out station R. If necessary, the second traveling plate 14 also moves in the Z-axis direction by driving the traveling driving motor 19.

The lifting rod 15, that is, the gripping pawl 17,
It is lowered by the motor 20 for raising and lowering, the vacant gripping claws 17 are closed, and the unprocessed workpiece W at the loading / unloading station R is gripped. While gripping the unprocessed workpiece W, the exchange arm 16 rotates by a predetermined angle, the gripping claws 17 gripping the processed workpiece W are opened, and the processed workpiece W is removed from the loading / unloading station R. It is placed in an appropriate position.

The first traveling plate 11 and the second traveling plate 14
In the position control, the positions of the first traveling plate 11 and the second traveling plate 14 are indirectly detected by an encoder (not shown) provided at the rear of the traveling drive motors 18 and 19, and the position detection signal is output from an external device (not shown). The control is performed by controlling the driving of the drive motors 18 and 19 by the control device.

The positions of the first traveling plate 11 and the second traveling plate 14 are detected by a desired stop position, that is, immediately above the loading / unloading station R and the work headstock S in addition to the encoder.
Above the work-loading position between the tailstock T and the tailstock T, a forward end position in the Z-axis direction where the lifting / lowering rod 15 mounts / dismounts the workpiece W on the loading / unloading station R, and the lifting / lowering rod 15 are moved along the main spindle axis A sensor for detecting that the first traveling plate 11 and the second traveling plate 14 are located at the retreat end position located above L is provided on the frames 2, 6 and the wall of the cover C or the first traveling plate 11. May go.

A second embodiment of the present invention will be described with reference to FIGS. 4, 5, 6 and 7. In the second embodiment, on the front side of the grinding machine, that is, on the operator side, a conveying surface having a height substantially equal to that of the table is provided adjacent to the grinding machine, and along the grinding machine, the machine spindle axis L direction (X-axis direction). A conveyor belt V for a conveyor belt traveling is provided.

The cover C which covers the table area and the loading / unloading station R has a width in the X-axis direction of the table area and the loading / unloading station R. An inverted L-shaped box having a height high enough to be provided, ie, a rectangular parallelepiped first space H on the table area
A rectangular parallelepiped second space H2 having the same width and substantially the same height and protruding to the rear side is formed on the upper part of the first space 1.

On the back surface of the first space forming portion of the cover C,
A rectangular parallelepiped grinding wheel head cover E covering the grinding wheel head D which advances and retreats in the Z-axis direction perpendicular to the X-axis direction is joined, the boundary wall surface between them is missing, and the cover C and the grinding wheel head cover E occupy the same space. Has formed. That is, it is possible to perform a cutting feed to the table side where the grinding wheel G enters the first space. In addition,
The grindstone cover E is narrower than the cover C and is positioned below the second space forming portion of the cover C with an appropriate gap.

In the frame of the cover C, the upper surface of the horizontal frame member 2 erected between the upper ends of the upright frame members 1 and 1 at both front ends is provided with an appropriate space below the top wall plate 3. A first rail 4 is laid, and a second rail 7 is laid on an upper surface of a horizontal frame member 6 erected between the bottom positions of the second space H2 of the upright frame members 5 and 5 at both ends on the back of the first space H1. ing.

As shown in FIGS. 4 and 7, the first rail 4
A first traveling material 8 of an appropriate length (length corresponding to the width of the carry-in / out station R) that runs in the X-axis direction with rollers is placed on the second rail 7, and on the second rail 7 , A second traveling material 9 similar to the first traveling material 8 is placed. First running material 8
The upper ends of the hanging members 10, 10a are fixedly engaged with and fixed to both ends of the hanging members 10, and the lower ends of the hanging members 10, 10 reach the height of the second traveling member 9, and the hooking members 10b facing each other. , 10b.

Then, the second traveling material 9 and the hooks 10b, 10
b and the first traveling plate 1 that is full of the depth of the second space H2
1 is erected. That is, the first traveling plate 11 is disposed in the second space H2 via the first traveling material 8 and the second traveling material 9 to be the first traveling plate.
It can travel on the rail 4 and the second rail 7 in the X-axis direction.

On both side edges of the upper surface of the first traveling plate 11, Z
Third rails 12 and 12 parallel to each other in the axial direction are laid, and between the third rails 12 and 12, a long hole 13 having an appropriate width and opened in the Z-axis direction is formed on the front side so as to penetrate vertically. I have. On the third rails 12, 12, a second traveling plate 14 that can travel in the Z-axis direction with rollers is mounted.

An elevating rod 15 is provided at the front end of the second traveling plate 14 so as to be slidable in the up-down direction (Y-axis direction). At the lower end, the center of the exchange arm 16 is pivotally supported so as to index and rotate around the rotation axis in the X-axis direction, and both ends of the exchange arm 16 hold a workpiece W extending in the X-axis direction. The holding claws 17, 17 which open and close are mounted. When the second traveling plate 14 travels, its forward end position is
5 is a position on the conveyor V, and the retreat end position is a position where the elevating rod 15 is on the axis L of the work spindle.

In other words, traveling from the retreating end position to the advancing end position starts from the state where the front end of the second traveling plate 14 is located between the parallel horizontal frame members 2 and 6, as shown in the schematic diagram of FIG. , Which protrudes forward of the horizontal frame member 2. At this time, the horizontal frame member 2, the first travel plate 11, and the suspension member 10 are arranged so that the elevating rod 15 provided on the second traveling plate 14 can pass through the lower portion of the horizontal frame member 2 and be positioned forward. And a space F is provided between them.

The first traveling plate 11 and the second traveling plate 1
4 is provided with motors 18 and 19 for driving the traveling, and the second traveling plate 14 is provided with a motor 20 for driving the elevating rod 15 up and down and a motor for rotating the exchange arm and opening and closing the gripping claws. The first traveling plate 11 and the second traveling plate 14 and the elevating rod 15 are moved or moved up and down by respective driving motors 18, 19 and 20 via a bevel gear mechanism and a rack and pinion mechanism. I have.

The detection of the forward end position and the retreat end position of the second traveling plate 14 may be detected by an encoder (not shown) provided at the rear of the traveling drive motor 19, or the first traveling plate 14 may be detected by an encoder (not shown). 11 may be provided with a position detection sensor for detection. Further, the position control is performed by detecting the movement of the first traveling plate 11 in the X-axis direction and the elevation of the elevating rod 15 by the same means.

The motors 18 and 19 for running and driving, the motor 20 for driving up and down, and the motor for rotating the replacement arm and opening and closing the gripping claws are connected to an external control device (not shown) by a cable 3.
0. The cover C is in the second space H2
The width (length in the Z-axis direction) of the conveyor V in the front so that the portion corresponding to the length in the X-axis direction corresponding to the carry-in / out station R located at the left end is overhanging above the conveyor V Is formed to have a protruding portion C1 so as to protrude by a length substantially corresponding to.

The protruding portion C1 of the cover lacks only the lower surface, so that the second traveling plate 14 and the elevating rod 15 can be advanced to the advanced end position on the conveyor V. or,
On the front side of the grinding machine, that is, on the operator side, the cover C
The upper and lower sides are the vertical dimensions between the horizontal frame member 2 and the table, and a quadrilateral operation opening 31 having an appropriate horizontal dimension between the headstock and the tailstock is formed, and a sliding door type opening / closing door 32 is provided therein. Have been.

In the above-described work loading / unloading device, first, the first traveling plate 11 is located on the loading / unloading station R, and the second traveling plate 14 is at the forward end position, that is, the lifting rod 1.
5, that is, the gripping pawl 17 is moved forward by a driving motor 19 to a position immediately above the unprocessed workpiece W on the conveyor V.

The lifting rod 15, that is, the gripper 17 is
After being lowered by the motor 20 for raising and lowering and rotating the exchange arm 16 and opening and closing one of the gripping claws 17 to grip the unprocessed workpiece W on the conveyor V, the motor 20 for raising and lowering is driven. To rise. Then, the second traveling plate 14 is retracted to the retreat end position by driving of the traveling drive motor 19. That is, the second traveling plate 14 and the lifting / lowering rod 15 are disengaged from the protrusion C1 of the cover, and are located at positions where the unprocessed workpiece W gripped by the gripping claws 17 can be on the main axis of the tool.

Next, the first traveling plate 11 travels on the table in the X-axis direction by the drive of the traveling driving motor 18, and the unprocessed workpiece W gripped by the gripping claws 17 is moved to the work headstock. It is located above the workpiece mounting position between S and tailstock T. Then, the lifting rod 15, that is, the gripping claw 17 is lowered by the motor 20 for lifting and lowering, and at this time, the vacant gripping claw 17 is opened and closed to grip the processed workpiece W. At the same time, the exchange arm 16 is rotated by a predetermined angle, and the processed workpiece W is detached from between the work headstock S and the tailstock T, and the gripping claws 17 grip the unprocessed workpiece W.
Is open, and the unprocessed workpiece W includes the work headstock S and the tailstock T.
Held between.

Next, the lifting rod 15, that is, the gripping claw 17 is
After being raised by the motor 20 for raising and lowering drive, the first traveling plate 11 travels on the table in the X-axis direction by the driving of the motor 18 for traveling driving, and the first traveling plate 11 And the second traveling plate 14
Is the forward end position, that is, the lifting / lowering rod 15, that is, the gripping claw 17 is at a position immediately above the conveyor V.
9 is driven forward.

The lifting rod 15, that is, the gripping pawl 17,
It is lowered by the motor 20 for raising and lowering drive, and by the rotation of the exchange arm 16 and the release of the gripping claws 17 gripping the workpiece W,
The processed workpiece W is placed on the conveyor V. The processed workpiece W is carried out by the traveling of the conveyor V, and the next unprocessed workpiece W is carried in. Thus, the mounting and dismounting of the workpiece W with respect to the grinding machine are repeated.

When the work W is carried in and out in front of the bed B, only the cover at the carry-in / out position of the work W protrudes toward the worker when the work W is carried in and out in front of the bed B (C1). The cover C at another position, that is, the cover at the position where the worker mainly engages in the work, does not protrude.

Accordingly, since the cover projection C1 does not need to be set to a height greater than the height of the worker, the entire machine is compact. Further, since the transfer device does not move above the head of the worker as in the related art, the safety is improved and the accessibility of the worker to the processing position is improved.

[0060]

The work loading / unloading device for a machine tool according to the present invention is constructed by using the frame constituting the cover, so that the structural material is light, the manufacturing is easy, and the manufacturing cost is low. It is cheap. Furthermore, the size is compact and the required floor area does not increase, so that it is economical.

The cover is a cover that covers a processing area for preventing the scattering of a machining fluid or the like in processing in the machine tool and for work safety, and at the same time, is a cover for shielding the work transfer means for work safety. It is a structure that constitutes a single space and is structurally simple.

Therefore, it is possible for the worker to approach the processing place safely, without impairing the work efficiency, easy maintenance and inspection including tool change, and because of the integral structure, there is no gap or the like. High safety. Since the structure is such that the workpiece transport moving body is supported at both ends, the positioning accuracy of the workpiece transport moving body is high, and the moving speed can be increased.

Further, when carrying in / out the workpiece on the side of the worker, only the cover of the workpiece carrying-in / out position needs to be made to protrude, so that the worker enters / exits the workpiece to the workpiece. Not only the accessibility is good, but also the safety is improved because the transfer device does not move above the worker's head.

[Brief description of the drawings]

FIG. 1 is a front view of a work loading / unloading device for a grinding machine according to a first embodiment of the present invention.

FIG. 2 is a sectional side view (partially omitted) taken along line II-II of FIG.

FIG. 3 is a plan view (partially omitted) of a work loading / unloading device for a grinding machine according to the first embodiment of the present invention.

FIG. 4 is a front view of a work loading / unloading device for a grinding machine according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional side view (partially omitted) taken along line VV of FIG. 4;

FIG. 6 is a plan view (partially omitted) of a work loading / unloading device for a grinding machine according to a second embodiment of the present invention.

FIG. 7 is a partial perspective view of a frame structure of a cover of a grinding machine and a work loading / unloading device according to a second embodiment of the present invention.

FIG. 8 is a cross-sectional side view of a work loading / unloading device for a grinding machine according to the related art.

FIG. 9 is a plan view of a work loading / unloading device for a grinding machine according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upright frame material 2 Horizontal frame material 3 Wall board 4 1st rail 5 Upright frame material 6 Horizontal frame material 7 2nd rail 8 1st running material 9 2nd running material 10 Suspension material 10a, 10b Hook part 11 1st running Plate 12 Third rail 13 Slot 14 Second running plate 15 Lifting rod 16 Replacement arm 17 Gripping claw 18, 19 Motor for running drive 20 Motor for lifting drive 21 Cable 22 Operation opening 23 Opening door B Bed C Cover D Grindstone Table E Wheel head cover G Wheel wheel H1 First space H2 Second space R Carry-in / out station S Headstock T Tailstock V Transport conveyor

Continued on the front page (72) Inventor Takeshi Ito 1-1-1 Asahi-cho, Kariya-shi, Aichi, Japan Toyota Machine Works Co., Ltd. (72) Inventor Yoshifumi Nishisaka 28 Nodamachibawari, Kariya-shi, Aichi Japan ) Inventor Hidenori Sano 28 Nodacho, Nodacho, Kariya-shi, Aichi F-term (in reference) 3C033 BB00 GG01 HH12 HH22 PP07 3C047 FF01 HH01

Claims (7)

[Claims] 1. A cover that entirely surrounds at least a workpiece loading / unloading area, a workpiece holding area, and a processing area of a machine tool is formed of a frame and a wall plate, and a part of the frame forming the cover. A rail is laid in parallel between the workpiece loading / unloading area and the workpiece holding area, and the workpiece carrier is moved over the workpiece loading / unloading area, the workpiece holding area, and the processing area. A work carrying-in / out device for a machine tool on which a work carrier is provided, and a work carrier is provided with a work holding part and a work holding part elevating means. 2. The work carrier gripping portion of the work carrier is provided on the work carrier so as to be moved horizontally at right angles to the traveling direction of the work carrier in the work carry-in / out area. 2. A workpiece loading / unloading device for a machine tool according to claim 1. 3. The apparatus for loading / unloading a workpiece in a machine tool according to claim 1, wherein the workpiece loading / unloading area is a workpiece stocker or a conveyor. 4. A cover that entirely surrounds at least a workpiece loading / unloading area, a workpiece holding area, and a processing area of a machine tool is formed of a frame and a wall plate, and a part of the frame forming the cover. Rails are laid in parallel between the work loading / unloading area and the work holding area, with a vertical step, and are suspended from high rails and run while supported by low rails. A carrier table is provided, and the workpiece gripper and the workpiece gripper elevating means are provided on the workpiece carrier so as to be moved horizontally at right angles to the traveling direction of the workpiece carrier in the workpiece loading / unloading area. Work loading / unloading device for machine tools. 5. A transfer conveyor is provided at a moving end position of a workpiece gripper and a workpiece gripper lifting / lowering means in a workpiece loading / unloading area, which is horizontal at right angles to a traveling direction of a workpiece transport table. 2. A workpiece loading / unloading device for a machine tool according to claim 1. 6. A work carrier is supported on a first traveling plate traveling along a parallel rail, and is guided and supported on the first traveling plate so as to be able to travel in a horizontal direction perpendicular to a laying direction of the rail. 6. A workpiece gripper and a second traveling plate supporting the workpiece gripper elevating means.
A workpiece loading / unloading device for a machine tool according to any one of the above. 7. The second traveling plate includes a workpiece gripping portion and a workpiece gripping portion lifting / lowering means positioned between the parallel rails at a retracted end position and at a position below the rail at a high position. 7. The workpiece loading / unloading device for a machine tool according to claim 6, wherein the workpiece travels between a forward end position protruding forward of the rail.