JPH0723155Y2 - Automatic pallet changer for machine tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an automatic pallet changing device for a machine tool such as a machining center.

[Prior Art] For example, a machining center capable of performing various operations such as slicing, drilling, boring, and the like is equipped with an automatic pallet changing device for automatically changing a pallet on which a work is attached. As a known technology of this type of conventional automatic pallet changing device, there is one described in Japanese Patent Publication No. 58-52781.
This will be described with reference to FIG.

In FIG. 9, (1) is a milling machine, (2) is a base that constitutes the milling machine (1), and guide rails (3) and (3) are provided in parallel on the upper surface of the base (2). .
Reference numeral (4) is a work table installed on the guide rails (3) and (3), and the work table (4) is driven by the driving force of the drive motor (5) which can rotate in the forward and reverse directions.
(3) It is adapted to move linearly back and forth. (6) is a pallet table installed on the upper surface of the work table (4), (7) is a vertical column supported by the base (2),
(8) is a spindle head slidably mounted on one side of the vertical column (7), and (9) is a spindle rotatably supported by the spindle head (8).

(10) is an automatic pallet changing device attached to the milling machine (1). In the pallet automatic changer (10), (11) is a base, (12) is an indexing table installed on the base (11), and (13) is half a turn on the indexing table (12). A turntable supported so as to turn, and the pallet support rails (14) (14) and (15) (1) aligned in a linear direction are provided on the upper surface of the turntable (13).
5) is provided at a point symmetrical position from the turning center. (16) (1
6 ') is a pallet on which a work (not shown) is placed and fixed, and this pallet (16) (16') is placed on the pallet support rails (14) (14) and (15) (15). It is placed and held so that it can move in the linear direction. The pallets (16) and (16 ') are intermittently stopped and held at the pallet transfer position (a) and the pallet standby position (b), which are point-symmetrical positions, by the turning operation of the turning table (13), and the pallets are also held. At the transfer position (a), the pallet support rails (14) (1
4) or (15) (15) and the pallet table of the milling machine (1) are linearly transferred. (17) is each pallet support rail (14) (14) and (15) (15)
Between the pallets and the pallets (16) and (16 ') at the pallet transfer position (a). Pivot table (13) with engaging pallets (16) (16 ')
And the pallet table (6).

Next, the pallet replacement procedure will be described below.

At the pallet standby position (b), when a pallet (16 ') holding an unworked work (not shown) is placed on one of the support rails (14) (14) of the turning table (13),
The turning table (13) rotates half a turn, and the pallet (16 ')
To the pallet transfer position (a). In this state, the work table (4) of the milling machine (1) moves to the right and the pallet table (6) faces the pallet support rails (14) and (14) at the pallet transfer position (a). Next, the engagement tool (17) moves to the left side after engaging with the pallet (16 '), and moves the pallet (16') from the support rails (14) (14) to the pallet table (6) of the milling machine (1). Transfer to the top. Then, the engagement between the engagement tool (17) and the pallet (16 ') is released, the pallet table (6) is moved to the left, and the pallet (16') is held at the work processing position (c). Pallet (1
While the work on 6 ') is processed, the next pallet (16) is placed on the support rails (15) (15) located at the pallet standby position (b) while the work is being processed. When the machining of the work is completed, the pallet table (6) moves to the left and faces the support rails (14) (14) of the turning table (13), and at the same time, the engaging tool (17) causes the pallet table (6) to move. ) It engages with the upper pallet (16 ') and then moves to the right to transfer the pallet (16') onto the support rails (14) (14) of the revolving table (13). Then, the revolving table (13) makes a half rotation, the pallet (16 ') on which the processed work is placed moves to the pallet standby position (b), and the processed work on the pallet (16') is moved. After the predetermined parts are assembled, they are taken out from the support rails (14) (14). Then, the pallet holding the unworked work is placed on the support rails (14) (14) located at the pallet standby position (b). Follow the same procedure to replace the pallets in sequence.

[Problems to be Solved by the Invention] At the pallet standby position (b), various parts are assembled to the machined work held on the pallet. However, according to the conventional automatic pallet changing device, the pallets (16) and (16 ') can be linearly reciprocated on the revolving table (13).
Could not be rotated in place. Therefore, when assembling various parts to a machined work, the worker must move around the work, which requires a great deal of labor and time for assembling the parts, especially on the side facing the slicer of the work. It was difficult to assemble the parts into the, and the workability was extremely poor.

Further, as disclosed in Japanese Utility Model Laid-Open No. 61-61142, the pallet transfer arm has a birefringent structure, and the tip side arm is rotated at an angle twice that of the base side arm so that the tip side. There is a linear movement path of the tip of the arm, but it is possible to move the pallet linearly without such a special structure, and even in this conventional example, the pallet is at the pallet standby position. Since it cannot be freely rotated, there was a problem similar to the above. Furthermore, this prior art is a system in which the driving means of the pallet transfer arm is installed on each pallet pedestal, and this requires an increase in the inertial weight of the revolving table and also a large driving force and braking force. However, not only is the device complicated and expensive, but there is also a restriction on speeding up.

The present invention has been proposed in view of the above problems, and an object of the present invention is to provide an automatic pallet changer capable of rotating a pallet at a fixed position on a turntable.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a revolving table rotatably installed at a position adjacent to a machine tool equipped with a pallet table on which a pallet is placed, and a revolving table. A pallet pedestal that is rotatably mounted around a hollow pivot part in a point-symmetrical part of the pallet, and a pallet that guides the pallet so that it can be moved linearly on the upper surface, and is horizontally rotatable on the upper surface of the pallet pedestal. Pivoted,
In addition, a part of the pallet is removably engaged with an engaging groove formed on both sides of the pallet in a direction orthogonal to the linear movement direction of the pallet so that the pallet is supported between the pallet pedestal and the pallet table of the machine tool. A pallet transfer arm that linearly transfers the pallet pedestal and the pallet pedestal pedestal at the pallet moving position by intermittently stopping the pallet transfer position and the pallet standby position at the pallet transfer position and the pallet standby position. And a rotary table drive unit facing each other, and an input shaft rotatably incorporated in a hollow pivot of each pallet pedestal. Two input rollers, which serve as rotational torque transmitting members, are provided at the lower end of the input shaft. And a pallet transfer position, which is provided with an input-side collar plate arranged in a point-symmetrical position, and which transmits a rotational force to the pallet transfer arm via the input shaft. And an output shaft that is erected and held concentrically with the input shaft that is installed below the input shaft incorporated in the hollow pivot of the pallet cradle that intermittently stops at the pallet transfer position. 2 of the above-mentioned power transmission means at the upper end of
Each connecting roller is provided with an output side collar plate having a connecting groove which is engaged at the time of the turning operation of the turning table and which transmits the rotational torque, and which has open connecting grooves at both ends in the entering direction, and from the output shaft via the power transmission means. It is installed between the arm drive unit that rotationally drives the pallet transfer arm, the hollow pivot of each pallet pedestal, and the input side collar plate, and is always locked by the locking projections via the spring.
First locking means that supports a locking body that blocks rotation of the input shaft so as to be movable in the radial direction of the input shaft, and the locking body of the first locking means is installed at the pallet transfer position. Each time each pallet cradle is intermittently stopped at the pallet transfer position, a part of the locking body enters and engages and separates the locking body from the locking projection against the spring, It is installed between the first releasing means composed of a cam member for releasing the rotation prevention and each pallet pedestal and the swivel table, and is always inserted and locked in a locking ring via a spring, and the center of the pallet pedestal is fixed. Second locking means that holds a locking rod that prevents rotation about the pivot portion so that it can be retracted from the locking ring, and a pallet standby position corresponding to the locking rod of the second locking means. The pallet holders are installed in the By escape from wheels, which is constituted by a second release means for enabling rotation of the pallet receiving table to the pivot table.

[Operation] When the pallet holder on which the pallet holding the unmachined work is placed is held at the pallet transfer position by the turning operation of the turning table, the output shaft of the arm drive unit is associated with the turning operation of the turning table. And the input shaft of the power transmission means are concentrically opposed to each other, and the two connecting rollers of the input side flange plate engage with the connecting groove of the output side flange plate in a state capable of transmitting the rotational torque. At the same time, the engagement of the input shaft by the first engagement means is released by the cam member serving as the first release means. In this state, the arm drive unit is driven, the drive force is transmitted from the output shaft to the input shaft, the pallet transfer arm rotates, and the arm and the engaging groove of the pallet work together to rotate the unit. Movement is converted into linear movement,
A pallet is linearly transferred between a pallet table of a machine tool and a pallet cradle located at a pallet transfer position of an automatic pallet changing device. Then, when the pallet holding the machined work by the machine tool is returned to the pallet cradle at the pallet transfer position, the turning table turns, and the pallet holding the machined work is moved to the pallet standby position. A second releasing means is installed at the pallet standby position, and by operating the second releasing means, the second locking means is released from the pallet standby position on the revolving table. It can be rotated. As a result, the work of assembling various parts can be performed with the direction of the machined work on the pallet placed on the pallet cradle at the pallet standby position facing the easy direction. The relationship between the output shaft of the arm drive unit and the input shaft of the power transmission means at the pallet transfer position is configured to be engageable and disengageable with respect to the turning operation of the turning table, and the first locking To unlock the means,
A cam member installed at the pallet transfer position is used to perform the same relationship, thereby eliminating the need to provide a drive means for the pallet transfer arm on each pallet cradle and reducing the rotational load weight of the revolving table. Then
Moreover, the rotational moment of inertia can be reduced to reduce the driving force and braking stop force of the turning table, simplifying the device,
Higher speed can be achieved.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, (21) is a machine frame of an automatic pallet changing device, which is installed at a position adjacent to a machine tool having a pallet table (not shown) at a work processing position (c). As shown in FIG. 1 and FIG. 2, on the upper end surface of the machine frame (21), an annular shape of a turning table (23) installed so as to be able to turn in the forward and reverse directions about a central axis (24). The track plate (22) is attached. This swivel table (23)
As shown in FIG. 1 and FIG. 4, the flat part (23a) has inclined parts (23b) (23b) on both sides, and brackets () are provided at a plurality of positions on the lower surface of the flat part (23a). A wheel (26) rolling on a raceway plate (22) is rotatably mounted via a wheel (25). (27) is a turning table drive unit for turning the turning table (23), and the turning table drive unit (27) is below the central shaft (24) and is a frame portion (21a) of the machine casing (21). It is located at. The turning table drive unit (27) is, for example, as shown in FIG. 5, a worm wheel attached to the center shaft (24) of the motor shaft (28a) of the drive motor (28) with reduction gear that can be indexed and positioned. Install a worm that meshes with the drive motor (2
By transmitting the driving force of 8) to the central shaft (24) via the worm and the worm wheel, the turning table (23) is turned in the forward and reverse directions by half rotations.

As shown in FIGS. 1 and 4, pallet rests (29) and (29 ') are arranged at points symmetrical with respect to the central axis (24) on the swivel table (23). Each pallet stand (2
Since 9) and (29 ') have the same structure, only one of them will be described below. As shown in FIG. 2 and FIG. 4, the pallet cradle (29) has a gear cover (3) having a hollow pivot (31) on the lower surface of the center of a rectangular support table (30).
2) is fixed. As shown in FIG. 2, FIG. 3, FIG. 10, and FIG. 11, support walls (33a) (33b) are erected on both side edges of the upper surface of the support table (30), and one support wall (33a) To
As shown in FIGS. 2 and 11, a notch (34) opened to the outer end face is provided along the upper surface of the support table (30). Also, the support wall (33a) of the pallet cradle (29)
In (33b), as shown in FIGS. 1, 3, and 10,
A plurality of large and small support rollers (35) (36) for linearly moving the pallet (41) are rotatably supported. As shown in FIG. 10, the pallet (41) has guide steps (41a) on both sides of the lower surface, and the guide steps (41a)
On the other hand, the support roller (35) prevents lateral shake, and the support roller (36) supports the load of the pallet (41) and linearly moves the pallet (41). This pallet (41)
An engaging plate (42) is provided at one end in the moving direction of. As shown in FIG. 1, FIG. 2, and FIG. 3, the lower surface of the support table (30) is located above the swivel table (23) and has a hollow pivot portion (31).
A plurality of wheels (37) rolling around the center of the vehicle are mounted via brackets (38). As shown in FIG. 2, the support structure of the support table (30) with respect to the swivel table (23) has a hollow pivot portion (31) bearing on a support wheel (39) mounted in a through hole of the swivel table (23). It is rotatably supported via (40) and (40).

On the support table (30), FIG. 10, FIG. 11, FIG.
As shown in FIGS. 2 and 3, the engaging roller (43a) is inserted into the engaging groove (42a) on the lower surface of the engaging plate (42) attached to one end surface of the pallet (41) in the linear movement direction. A pallet transfer arm (43) whose front end engages is rotatably installed via a pivot (44) and a bearing (45).

A power transmission means (46) shown in FIG. 2 is connected to the pallet transfer arm (43). As shown in FIG. 2, the power transmission means (46) has a bearing (48) in the central opening (30a) of the support table (30) and the hollow pivot (31).
The upper part of the shaft body (50) of the input shaft (47), which is rotatably supported in the vertical direction via the (49), and the pivot shaft (44) of the pallet transfer arm (43). Transmission gears (54) (55) that are fixed and meshed with each other, and the shaft body (5
It is composed of an input side collar plate (51) fixed to the lower end (50a) of (0). As shown in FIGS. 6 and 12, the input side collar plate (51) serves as a rotational torque transmission member at a point symmetrical position on the lower surface with respect to the shaft body (50) of the input shaft (47). The connecting rollers (52) (52) are attached by bolts (53) (53).

Rotational torque is transmitted from the arm drive unit (56) shown in FIGS. 1 and 2 to the input side flange plate (51) of the power transmission means (46). This arm drive unit (56)
Is fixedly installed on the frame portion (21a) of the machine casing (21) below the pallet transfer position (a), as shown in FIG. The structure is such that the casing (57), the hydraulic motor (58) attached to one side of the casing (57), and the hydraulic motor (58).
Bevel gears (63) (64) and relay shaft (6) from the shaft (58a) of
5), the output shaft (59) that is rotationally driven via the spur gears (66) (65), and the output side that is fixed to the upper end (67a) of the shaft body (67) of the output shaft (59). It consists of a collar plate (68).

The output shaft (59) is provided so as to have the same axis as the input shaft (47) of the pallet receiving table (29) stopped at the pallet transfer position (a). At the center of the upper surface of the output side flange plate (68), as shown in FIGS. 2, 5, 6, and 12, two connecting rollers (52) of the input side flange plate (51) are provided. )
Connection groove (69) where (52) just enters and both engage
Is formed. The connecting groove (69) is formed in an arc shape centering on the turning center axis (24) of the turning table (23), and both ends are open. In other words, the connecting groove (69)
The arc shape is curved and formed to have the same curvature as the turning locus of the connecting rollers (52) (52) during the turning operation of the turning table (23). Accordingly, when the turning table (23) turns and the pallet receiving base (29) arrives at the pallet transfer position (a), the two connecting rollers (52) (52) of the input side collar plate (51). Enters from one open end of the connecting groove (69) of the output side collar plate (68), and the input shaft (47) is stopped on the same axis as the output shaft (59), whereby two connecting rollers are connected. A state in which both (52) and (52) are inserted into the connecting groove (69) is realized. With this configuration, it becomes possible to transmit the rotational torque from the output shaft (59) to the input shaft (47), and the pallet transfer arm (43) can be rotated. In FIG. 2, (61) and (62) are bearings that support the output shaft (59) and the relay shaft (60) in the housing (57).

The rotation of the pallet transfer arm (43) is as shown in FIG.
It may be performed only at the pallet transfer position (a) shown in the figure, and it is necessary to prevent free rotation of the input shaft (47) at a position other than this position (a). Therefore, FIG. 2 and FIG.
A first locking means (70) shown in the figure is installed. As shown in FIG. 2, the first locking means (70) is fixed to the lower end of the hollow pivot portion (31) so as not to rotate integrally with the input shaft (47). 71a), and guide grooves (71d) (71d) formed on both side walls (71c) (71c) of the tip projection (71b) of the mounting member (71).
The locking body (72) slidably engaged in the radial direction of the input shaft (47) and the locking recess (72b) formed at one end of the locking body (72) in the sliding direction. Correspondingly, a locking projection (74) protruding from a part of the input-side collar plate (51), and a pin (upper part of the upper surface of the locking body (72) and part of the mounting member (71) ( 75)
It consists of a tension spring (77) stretched between (76).

The above configuration is shown in exploded perspective view in FIG.
When the pallet cradle (29) is in a position other than the pallet moving position (a), the tension spring (77) causes the locking body (72) to move into the guide groove (71d) (71d) of the mounting member (71).
Pull toward the center of the input shaft (47) in
The locking recess (72b) at the tip of 2) is engaged with the locking projection (74) of the input side collar plate (51) to prevent free rotation of the input shaft (47).

The input shaft (47) is required to be rotatable at the pallet transfer position (a), and therefore, the input shaft (47) is unlocked by the first locking means (70). A first release means of is installed. This first releasing means is
A cam follower (73) attached to the lower surface protrusion (72a) of the locking body (72), and a cam fixed to the machine frame (21) below the pallet transfer position (a) corresponding to this cam follower (73). It consists of a member (78). The cam member (78) is formed with a cam groove (7) formed along the turning movement locus of the cam follower (73) of the locking body (72) during the turning motion of the turning table (23).
9) is formed on the upper surface. This cam groove (79) is the fifth
As shown in FIG. 12 and FIG. 12, the pallet transfer position (a) is the center, and the shape is symmetrical on both sides in the turning direction. In particular, both ends of the cam groove (79) are open ends, and one of the open ends is It is formed so that the cam follower (73) can enter. Since the turning table (23) repeats the right half rotation and the left half rotation alternately, the cam groove (79) has the symmetrical shape. The cam groove (79) separates the locking body (72) from the locking projection (74) of the input side collar plate (51) from the entrance end of the cam follower (73) toward the center of the cam groove (79). It is bent and formed so that the locking is released. As a result, when the pallet receiving base (29) is indexed and moved to the pallet transfer position (a) by a half rotation of the turning table (23), when the pallet receiving position (a) arrives at this position (a), the locking is just mechanically performed. It has been released to eliminate the need for a dedicated actuator. When the pallet cradle (29) is separated from the position (a), the locking is automatically performed again.

By the way, as shown in FIG. 2, the pallet pedestal (29) is rotatably supported by the support wheel (39) and the bearing (40) with respect to the turning table (23). At the pallet standby position (b), the pallet (41)
This is for facilitating the assembly of the parts by freely changing the direction of the parts assembly surface of the upper work (90). In other cases, rotation of the pallet pedestal (29) To prevent it, a second locking means (80) is installed on the swivel table (23) with respect to the support table (30) of each pallet cradle (29). The second locking means (80) is shown in FIGS.
As shown in the figure, a holding cylinder (81) fixed to the swivel table (23), a locking rod (82) penetratingly held in the holding cylinder (81) so as to be vertically movable, and this locking rod ( It is composed of a spring (84) that pushes the upper part (82) upward, and a locking ring (85) provided on the support table (30) corresponding to the locking rod (82). The locking rod (82) is provided with a large-diameter rod portion (82b) at the upper end of the small-diameter rod portion (82a), and an annular step (82c) is formed at the boundary between both rod portions (82a) (82b). , A protruding rod (82d) having a locking collar (82d) at the lower end on the lower surface of the small diameter rod (82a).
e) is projected. An annular cover plate (83) is attached and fixed to the lower end opening end of the holding cylinder (81), and a spring (8) is provided between the cover plate (83) and the annular step (82c) of the locking rod (82).
4) is installed in a compressed state. The locking wheels (85) are installed at a plurality of corners of the rectangular support table (30), and a stopper plate (86) is installed at the upper open end. With respect to the locking wheel (85), only one locking rod (82) is installed at a predetermined position on the turning table (23) through the holding cylinder (81). With this configuration, the pallet tray (2
The support table (30) of 9) is locked to the revolving table (23) to prevent free rotation.

However, the work (90) is rotated by rotating the pallet (41) on the pallet cradle (29) that has arrived at the pallet standby position (b).
When it is necessary to orient the part-assembling surface of (1) in a direction in which it is easy to work, it is necessary to unlock the support table (30) by the locking rod (82). Therefore, as shown in FIGS. 1 and 8, the second releasing means (87) has the locking rod (82) of the support table (30) at the pallet standby position (b).
In contrast, it is installed in a part of the turntable drive unit (27). As shown in FIG. 8, the second releasing means (87) is composed of an air cylinder, and a releasing plate (89) is provided on the upper end of the piston rod (88) thereof. ), The locking flange (82d) at the lower end of the locking rod (82) and the cover plate (83) are inserted into and engaged with each other. When necessary, the operator manually operates the piston rod (88) of the air cylinder (87) to move downward and downward, whereby the locking rod (82) is pulled down against the spring (84). ,
The lock is released from the locking wheel (85) and the lock is released, and the operator manually pushes the support table (30) to rotate it on the swivel table (23) and then through the pallet (41). The component assembling work can be performed by directing the component assembling surface of the placed work (90) in a direction in which the work can be easily performed. When this work is not necessary or when rotation is not necessary after the work is completed, the piston rod (88) of the air cylinder (87) is caused to project upward, and the locking rod (82) is moved to the spring (84). ), It is pushed upward by and is inserted and locked in the locking ring (85) at the corner of the rectangular support table (30). When the pallet (41) holding the unprocessed work is placed on the pallet receiving table (29) at the pallet standby position (b), the orientation of the support table (30) is as shown in FIGS. 1 and 4. State, that is, the linear movement direction of the pallet (41) coincides with the straight line passing through the central axis (24) of the turning table (23), and the direction of the tip of the pallet transfer arm (43) turns. It is set to be on the central axis (24) side of the table (23).

The present invention has the above configuration, and its operation will be described below.

First, as shown in FIG. 13 (a), the pallet (41) holding the first unworked work is placed on the pallet cradle (29) at the pallet standby position (b). And
The turning table (23) is rotated by half, and the pallet receiving base (29) is moved to the pallet transfer position (a) as shown in FIG. 13 (b). When it reaches this position (a), the connecting roller (52) of the input side collar plate (51) of the power transmission means (46).
(52) is an output side collar plate (68) of the arm drive unit (56)
It enters into and engages with the connecting groove (69), and the rotational torque can be transmitted. At the same time, the first locking means (70)
The cam follower (73) of the locking body (72) enters into the center of the cam groove (79) of the cam member (78) which is the releasing means, and the locking body (72) causes the input side collar plate (51). ) Locking projections (74)
Away from and release the lock. Subsequently, the arm drive unit (56) is driven, and the pallet transfer arm (43) is rotationally driven clockwise through the power transmission means (46),
The state is changed from (b) to (c) in FIG. This allows
The pallet (41) is transferred from the pallet transfer position (a) to the pallet table on the left side of the machine tool. And
It waits in this state until the machining of the work is completed on the machine tool side. Meanwhile, the pallet (41) holding the next unprocessed work is placed on the pallet pedestal (29 ') on the pallet standby position (b). When the machining of the work is completed on the machine tool side, the pallet transfer arm (43) is driven to rotate counterclockwise from the state shown in Fig. 13 (c) to hold the machined work on the pallet table of the machine tool. The pallet (41) is transferred onto the pallet cradle (29) located on the right pallet transfer position (a). Then, the revolving table (23) is rotated half way in the opposite direction to the front, and the pallet (41) holding the processed work is moved to the pallet standby position (b), and the pallet (41) holding the unprocessed work is moved. Move to the pallet transfer position (a). The unprocessed workpiece that has arrived at the pallet transfer position (a) is transferred to the pallet table side of the machine tool by the pallet transfer arm (43) as described above and is processed. On the other hand, after the processed work that has arrived at the pallet standby position (b) is assembled with various parts, it is taken out from the pallet pedestal (29) and the pallet (41) holding the next unprocessed work is pallet pedestal ( 29)
Place on top. After that, the above operation is repeated.

The automatic pallet changing device according to the present invention can be used not only for milling machines but also for various machine tools such as machining centers.

[Advantage of the Invention] According to the present invention, the pallet pedestal on the revolving table can be rotated at a fixed position. Therefore, when assembling various parts on the machined workpiece, the pallet pedestal can be rotated to a predetermined position. It is possible to easily assemble various parts from the work position on all surfaces of the processed work held on the pallet on the pallet pedestal. Therefore, the labor and labor of the worker can be reduced, and the workability can be significantly improved. In addition, the pallet replacement is ensured by the pallet transfer arm rotatably arranged on the pallet receiving base.
In addition, it can be carried out quickly, the structure is simple, and the manufacturing cost is low.

[Brief description of drawings]

FIG. 1 is a schematic front view showing the entire automatic pallet changing device according to the present invention, FIG. 2 is a longitudinal sectional view of an essential part of FIG. 1, and FIG. 3 is a left side showing a pallet cradle at a pallet standby position. FIG. 4 is a schematic plan view of the entire device of the present invention, FIG. 5 is a schematic plan view of a rotary table drive unit and an arm drive unit, and FIG. 6 is an enlarged view of a connecting portion between a power transmission means and an arm drive unit. FIG. 7 (a) is the first side view in vertical section.
Right side view of the locking means of FIG. 4, (b) is a plan view of the tip of the locking body, FIG. 8 is a vertical cross-sectional side view showing the second locking means and the second releasing means, and FIG. Schematic perspective view showing the
10 is a schematic perspective view showing the relationship between the pallet pedestal and the pallet according to the present invention, FIG. 11 is a schematic perspective view of the upper surface of the pallet pedestal, and FIG. 12 is a connecting portion between the power transmission means and the arm drive unit. Also, an enlarged exploded perspective view showing the relationship between the first locking means and the first releasing means and FIGS. 13 (a) to 13 (c) are explanatory views of the pallet changing operation of the present invention. (A) ... Pallet transfer position, (b) ... Pallet standby position, (23) ... Swivel table, (27) ... Swivel table drive unit, (29) (29 ') ... Pallet cradle, (30) ... Support table , (31) ... Hollow pivot, (41) ... Pallet,
(42) ... Engagement plate, (42a) ... Engagement groove, (43) ... Pallet transfer arm, (46) ... Power transmission means, (47) ... Input shaft, (51) ... Input side collar plate, (52) ) (52)… Connecting roller,
(56) ... Arm drive unit, (59) ... Output shaft, (68)
Output side collar plate, (69) ... Connection groove, (70) ... First locking means, (71) ... Mounting member, (72) ... Locking body, (73) ... Cam follower, (74) ... Engagement Stop protrusion, (77) ... spring,
(78) ... First releasing means (cam member), (79) ... cam groove, (80) ... second locking means, (87) ... second releasing means (air cylinder).

Claims (1)

[Scope of utility model registration request] 1. A turning table rotatably installed at a position adjacent to a machine tool equipped with a pallet table on which a pallet is placed, and a rotatably mounted point-symmetrical portion on the turning table about a hollow pivot. A pallet pedestal that is placed on the upper surface of the pallet pedestal so that the pallet can be linearly moved on the upper surface of the pallet pedestal.
In addition, a part of the pallet is removably engaged with an engaging groove formed on both sides of the pallet in a direction orthogonal to the linear movement direction of the pallet so that the pallet is supported between the pallet pedestal and the pallet table of the machine tool. A pallet transfer arm for linear transfer and the pallet table and pallet pedestal at the pallet transfer position, which is driven so that the pallet pedestal can be intermittently stopped at a pallet transfer position and a pallet standby position that are point-symmetrical. And a rotary table drive unit facing each other, and an input shaft rotatably incorporated in a hollow pivot of each pallet pedestal. Two input rollers, which serve as rotational torque transmitting members, are provided at the lower end of the input shaft. And a pallet transfer position, which is provided with an input-side collar plate arranged in a point-symmetrical position, and which transmits a rotational force to the pallet transfer arm via the input shaft. And an output shaft that is erected and held concentrically with the input shaft that is installed below the input shaft incorporated in the hollow pivot of the pallet cradle that intermittently stops at the pallet transfer position. 2 of the above-mentioned power transmission means at the upper end of
Each connecting roller is provided with an output side collar plate having a connecting groove which is engaged at the time of the turning operation of the turning table and which transmits the rotational torque, and which has open connecting grooves at both ends in the entering direction, and from the output shaft via the power transmission means. It is installed between the arm drive unit that rotationally drives the pallet transfer arm, the hollow pivot of each pallet pedestal, and the input side collar plate, and is always locked by the locking projections via the spring.
First locking means that supports a locking body that blocks rotation of the input shaft so as to be movable in the radial direction of the input shaft, and the locking body of the first locking means is installed at the pallet transfer position. Each time each pallet cradle is intermittently stopped at the pallet transfer position, a part of the locking body enters and engages and separates the locking body from the locking projection against the spring, It is installed between the first releasing means composed of a cam member for releasing the rotation prevention and each pallet pedestal and the swivel table, and is always inserted and locked in a locking ring via a spring, and the center of the pallet pedestal is fixed. Second locking means that holds a locking rod that prevents rotation about the pivot portion so that it can be retracted from the locking ring, and a pallet standby position corresponding to the locking rod of the second locking means. The pallet holders are installed in the By escape from wheel rotatably to the second releasing means and automatic pallet exchanger of a machine tool, characterized in that it consists of a pallet receiving table to the pivot table.