JP3171314B2 - Guided work table - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work table for transmitting and receiving a machine tool, in particular, a lathe, via a transfer means.

[0002]

2. Description of the Related Art Workpieces are prepared on a work table in order to perform unmanned machining of a large number of workpieces continuously on a lathe, and the workpieces are supplied to a chuck of the lathe or machined by a robot or a loader installed adjacent to the lathe. The returned work is returned to the table.

Conventionally, a work table of this type is known from Japanese Utility Model Laid-Open No. 2-53337. This is provided so that a plurality of work pallets are circulated on a work conveyor (work table), and a work transfer robot conveys between a work pallet at a transfer position and a work chuck of a machine tool. The work conveyor is configured to stack works on the work pallet 51. As shown in FIG. 7, planetary gear mechanisms 53 and 54 are used to simultaneously move the plurality of guide shafts 52 holding the work in accordance with the outer diameter of the work to the same radial position.

[0004] Further, Japanese Utility Model Laid-Open No. 6-42041 discloses
There are provided three sets of guide grooves 65 guided by three straight grooves 62 provided on a substrate 61 of a pallet shown in FIG. 9 and three cam grooves 64 provided on a work table 63 circulating on the work feeder. The rotation of the work table 63 causes the guide shaft to move in the radial direction on the work feeder without changing the phase, thereby holding the work.

[0005]

SUMMARY OF THE INVENTION
No. 53337 has a disadvantage that when the guide shaft 52 is moved in the radial direction, the guide shaft 52 is displaced in the circumferential direction as shown in FIG. There is no problem when the work outer shape is round, but in the case of a polygon or the like, if the work outer diameter is different, the phase of the work can be changed by the guide shaft. In the case of a polygon, the work holding means of the work transfer device has a holding part according to the shape, but cannot handle a change in phase due to a change in the outer diameter of the work. Has to be replaced as needed.

In Japanese Unexamined Utility Model Publication No. 6-42041, the guide portion formed by the linear groove provided on the substrate is relatively small with respect to the length of the guide shaft, so that the guide shaft becomes unstable and moves smoothly. Had the problem of not doing so. SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the related art, and has as its object to provide a work table having a guide shaft interlocking mechanism capable of smoothly moving and adjusting without changing the phase of the guide shaft. Is to do.

[0007]

A work table with a guide according to the present invention is a work table on which a work to be machined by a machine tool is mounted, the work table being provided on a base plate of a work table main body so as to be pivotable in a horizontal plane and being provided on an upper surface. A pallet on which a work is placed, a plurality of straight grooves of the same width drilled radially in a radial direction from a circumferentially equidistant position concentric with the center of rotation of the pallet on the base plate; An arc groove of the same width, which is formed in an impeller shape and intersects with the linear groove in the same number as the linear groove from a concentric circumferentially equidistant position, and is provided so as to mount the pallet on the base plate. The same number of supports fixed to the base plate between each of the straight grooves so that the ends thereof can be adjusted in length in a longitudinal slot drilled at the outer end with the pallet facing the center of the pallet. A rod, and the same number of guide shaft members as linear grooves supported by the inner end of the support rod and restricted in position by the arc groove and the linear groove. The position of the guide shaft member can be changed correspondingly.

A work table on which a work to be processed by a machine tool is placed, a plurality of pallets provided on a base plate of a work table body so as to be circulated in a horizontal plane, each of the pallets being capable of turning and placing the work on an upper surface; A plurality of straight grooves of equal width perforated in the base plate radially in a radial direction from a circumferentially equidistant position concentric with the center of rotation of the pallet; The same number of the linear grooves and the same width as that of the linear grooves are intersected with the linear grooves, and arc-shaped grooves of the same width are provided.The pallets are provided on the base plate. The same number of support rods fixed to the base plate between the linear grooves so as to be adjustable in length by long holes in the longitudinal direction formed at the outer end of the support rod, and the inner ends of the support rods support the same number of support rods. And the same number of guide shaft members as the linear grooves whose positions are regulated by the circular arc grooves and the linear grooves, and the position of the guide shaft members can be changed according to the size of the work by rotating the pallet. Things.

When the support rod and the pallet are loosened and swiveled counterclockwise (FIG. 3), the guide shaft is confined by the support rod by the impeller-shaped arc groove and simultaneously moves radially outward in the linear groove. Moving. The work is placed on the center of the pallet, and the pallet is rotated clockwise to move the guide shaft toward the center to contact the outer periphery of the work to fix the support rod and the pallet.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 of the present invention will be described with reference to FIGS. A base plate 2 is rotatably received at a plurality of locations on a lower surface of an outer periphery by rollers 3 on a top plate 1a of a box-shaped worktable main body 1, and is connected to an output shaft of a motor 4 with a speed reducer at the center of rotation. ing. This motor 4
The rotation of the base plate 2 is indexed by the rotation control.

A plurality of circular pallets 6 are arranged at equal intervals on the circumference of the base plate 2 concentric with the center of rotation. The pallet 6 is rotatably mounted on a support rod 7 described later, and can be lifted and positioned by a lifter described later. At the center position where the circular pallet 6 is arranged on the base plate 2, at a 120 ° interval divided into three equal parts having an inner end and extending near the outer periphery on a circle A (not shown) having the same center. Three radially identical straight grooves 8a, 8b and 8c penetrating vertically and having the same overall length are formed.

The pallet 6 has an inner end on a circle B (not shown) having the same or substantially the same size as the circle A and having an inner end at an interval of 120 °, and intersects the straight grooves 8a, 8b, 8c at one point with each other. And a right-handed impeller-shaped curve of the same shape and the same width curved in the same direction. In this example, a part of a circular arc is vertically penetrated to the vicinity of the outer periphery.
b, 9c are drilled. Usually, the inner end and the outer end of the arc groove are made to coincide with the inner end and the outer end of the straight groove, that is, the stroke is made the same. The three arc grooves may be curved grooves instead of arcs.

Each of the supporting rods 7a, 7b and 7c serving as a mounting table for the pallet 6 has a considerable thickness, and the contact surface with the upper surface of the base plate 2 and the mounting surface of the pallet 6 are formed in parallel. At the outer end, a long hole 7a ₁ in the longitudinal direction,
7b ₁ and 7c ₁ are penetrated and a counterbore surface is cut in the upper surface of the long hole corresponding to each of the long holes.

The counterbore faces have supporting rods 7a, 7b, 7c.
Washers 11a, 11b, and 11c that respectively hold the locks. From above, bolts 12a, 12b, 12c (partially not shown) are connected to the straight grooves 8a, 8a,
The supporting rod is fixed to the base plate by the base plate so that the upper position can be adjusted by being screwed into a tap hole provided at a position equidistant from the center of the pallet on the bisector of each of 8b and 8c.
The positions of these bolts 12a, 12b, 12c are
When provided on the bisector of a, 8b, and 8c, the displacement of the support rod at the time of changing the position of the guide shaft is minimized. It is free to shift the position for installation reasons.

The inner ends of the support rods 7a, 7b, 7c extend to the intersection of the straight groove and the arc groove, and the through holes 7a ₂ ,
7b ₂ , 7c ₂ (partly not shown) are formed, and upper and lower ends thereof are formed with large counterbore holes. Guide shafts 13a, 13b, 13 of the same length which are inserted into the counterbore holes at the upper ends thereof so as to slide into the arc grooves 9a, 9b, 9c, respectively.
c are respectively planted.

Straight holes 8a, 8b, 8c are formed in the counterbore holes at the lower end.
Nuts 14a, 14b, and 14c (not shown in the drawings) which are respectively slidably fitted to each other. And the nut 14a,
Bolts 16a, 16b, 16c via 14b, 14c
(Partially not shown) guide shafts 13a, 13
b, 13c are vertically fixed to the support rods 7a, 7b, 7c. As another support structure, a through hole for inserting the guide shaft is formed at the intersection of the inner end of the support rod, and the guide shaft is inserted into both the arc groove and the straight groove to stop the side of the support rod. It is also possible to adopt a form of fixing with screws. In this case, needless to say, the widths of the arc groove and the straight groove are made the same.

The push-up rods 17a, 17b, 17c (at the same distance from the center of the pallet 6 positioned at the pallet unloading position and at an angle of 3 equally spaced from the center of the pallet 6 which does not interfere with the guide shaft) are provided on the top plate 1a of the work table body 1. Holes for guiding the upper ends of some of them (not shown) are formed. The lower ends of the three push-up bars are integrated by a connecting plate 18.
9 is guided by a guide plate 21 mounted in the work table body 1 in the up-down direction.

A rack 22 is engraved on the side surface of the push-up bar 17b, meshes with a pinion 24 provided on an output shaft of a motor 23 with a speed reducer, and is moved up and down by rotation of the motor. When the pallet 6 is indexed to the unloading position on the base plate 2 as well, the three push-up rods 1
Three holes 26a, 2 through which 7a, 17b, 17c can pass
6b and 26c are drilled below each pallet.

The operation of the work table thus configured will be described. First, in order to determine the positions of the guide shafts 13a, 13b, and 13c in accordance with the work to be processed, the bolts 12a and 12 that fix the support rods 7a, 7b, and 7c are used.
b, 12c to allow the support rod to move. The pallet 6 is turned counterclockwise in FIG. With this operation, the guide shafts 13a, 13b, 13c are turned into the arc grooves 9a, 9b,
Due to the displacement of 9c, it is pushed outward along the straight groove and opened.

Since the guide shaft is firmly supported by the support rod and the support positions of the linear groove and the arc groove are determined by the thickness of the support rod and are separated, the movement is smooth. At this time, the support rods 7a, 7b, 7c also slightly move. This movement is absorbed by the long hole _{7a 1, 7b 1, 7c 1} . A work is placed on the pallet 6 and the pallet is turned clockwise to move to the center side so that three guide shafts abut on the outer periphery of the work. The workpiece is self-aligned by this contact. At this position, bolts 12a, 12b, 1
2c is tightened to fix the support rods 7a, 7b, 7c. By fixing the support rod, the pallet 9 is also fixed at the same time.

When the positions of the guide shafts of the six pallets are determined in this way, the works are stacked on the pallets 6. A robot (not shown) is provided between the lathe and the work table, and the work is carried out of the work table and attached to the chuck of the lathe. Since the receiving height of the robot is determined, when the upper work is carried out, the motor 23 rotates by a predetermined amount to rotate the pinion 2.
4, push-up rods 17a, 17b, 1 via rack 22
7c is raised.

The three push-up rods receive the lower surface of the pallet through the holes 26a, 26b, 26c of the base plate 2, and rise by a predetermined amount to lift the work to the receiving position. When the work on one pallet is completely unloaded in this manner, the motor 4 rotates a predetermined amount to rotate the base plate 2.
And the next pallet is indexed to the unloading position.

[0024]

[Embodiment 2] In the second embodiment, a case where a single pallet is used instead of a plurality of pallets. The base plate is fixed without the need for turning. Therefore, a motor with a speed reducer for turning drive is not required. In this case, the top plate of the main body of the worktable 1 can be used as a base plate, and a special base plate may be omitted. Other mechanisms are 1
It becomes individual.

[0025]

Since the present invention is constructed as described above, the guide shaft securely supported by the support rod can smoothly move in the arc groove and the straight groove without changing the phase of the guide shaft. This eliminates the need to replace the gripping portions (chuck claws) of the workpiece gripping means (chuck) provided in the workpiece transfer means, such as robots and loaders, even for workpieces having different workpiece outer diameters, particularly polygonal workpieces. Has excellent effects.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the inside of a main body of a work table of the present invention and a base plate.

FIG. 2 is a plan view of a work table.

FIG. 3 is an enlarged plan view of one pallet portion.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a view showing a case where the guide shaft is opened in the middle.

FIG. 6 is a diagram showing a case where a guide shaft is wide open.

FIG. 7 is a view showing a conventional guide shaft opening / closing mechanism.

FIG. 8 is a view showing movement of the guide shaft of FIG. 7;

FIG. 9 is a view showing a conventional guide shaft opening / closing mechanism.

[Explanation of symbols]

Reference Signs List 1 Work table body 2 Base plate 4, 24 Motor with reduction gear 6 Pallet 7a, 7b, 7c Support rod 8a, 8b, 8c Linear groove 9a, 9b, 9c Arc groove 13a, 13b, 13c Guide shaft 17a, 17b, 17c Push-up rod

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23Q 7/00 B23Q 7/02 B23Q 7/10 B65G 57/00

Claims (2)

(57) [Claims] 1. A work table on which a work to be machined by a machine tool is mounted, a pallet provided on a base plate of a work table body so as to be rotatable in a horizontal plane and mounting the work on an upper surface, and a pallet mounted on the base plate. A plurality of straight grooves of the same width drilled radially radially from the circumferentially equidistant position concentric with the center of rotation of the pallet; And an arc-shaped groove of the same width formed in an impeller shape intersecting with the straight groove, and an inner end is provided on the base plate so as to mount the pallet, and an inner end thereof is formed substantially at the center of the pallet at an outer end. The same number of support rods fixed between the linear grooves on the base plate so as to be adjustable in length with the provided longitudinal holes, and the arc groove and the linear groove supported by the inner ends of the support rods And a guide groove member having the same number as that of the guide shaft member, and the position of the guide shaft member can be changed according to the size of the work by rotating the pallet. table. 2. A work table on which a workpiece to be machined by a machine tool is mounted, a plurality of pallets provided on a base plate of a work table body so as to be circulated in a horizontal plane, each of which is pivotable and mounts the work on an upper surface. A plurality of straight grooves of equal width which are formed in the base plate radially radially from a circumferentially equidistant position concentric with the center of rotation of the pallet; An arc groove of the same width drilled in the shape of an impeller intersecting with the linear groove in the same number as the linear groove from the position, and provided on the base plate to mount the pallet; The same number of support rods fixed between the straight grooves on the base plate so that the length can be adjusted with a long hole in the longitudinal direction drilled at the outer end facing the center,
The guide rod includes the same number of guide shaft members as the number of linear grooves supported by the inner end of the support rod and whose position is regulated by the circular arc groove and the linear groove, and corresponding to the size of the work by rotating the pallet. A work table with a guide, wherein the position of the guide shaft member can be changed.