JPH0642041U - Work feeder work holder - Google Patents

Abstract

(57) [Summary] [Object] To provide a work holder having a centering mechanism of a work feeder in which a work is concentric with a predetermined mounting center and its phase does not change even if the diameter changes. [Structure] Pallet 4 arranged in a loop on the conveyance path of the work feeder and sequentially indexed to the work transfer position.
The base plate 7 is provided with elongated holes 7a in parallel with the radiation bc at equal intervals with respect to the work attachment center b, and two sets of holding guide rods are provided on the clamp pieces 8 which are positionally movable in the elongated holes. 12 is erected on the radiation, and the position movement of the clamp piece is centripetally performed by the rotation of the work table 16 having the arc-shaped cam groove 16a in which the guide rod 12 is fitted and inserted.
The three corners of the above are sandwiched by two sets of holding guide rods and adjusted so as to be vertically movable, and then the bolt 11 is tightened to fix the clamp piece to the substrate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a work holder having a centripetal mechanism for a work feeder.

[0002]

[Prior art]

 Conventionally, a lathe with a loading robot is usually provided with a work feeder for sequentially indexing a plurality of pallets at a delivery position. There is a technique disclosed in Japanese Utility Model Publication No. 4-32195 as a fixture for holding workpieces of various different diameters concentrically with the mounting center on the workpiece mounting center on the work feeder. As shown in FIG. 5, a cam plate 102 having a plurality of inner grooves 102a at its center is provided with a protruding portion at the center of a base 101 fixed on a pallet so that the cam plate 102 on the base can be rotated. An engaging portion 105 that engages with the above-mentioned guide groove is provided in the middle of a lever 104 whose one end is pivotally supported by a plurality of shafts 103 arranged on the outer side of the lever. The work W is gripped by the grip portion 106 of the lever.

[0003]

[Problems to be solved by the device]

 In the technique of Japanese Utility Model Publication No. 4-32195 described in the prior art, for example, when gripping a hexagonal material, the phase changes with each diameter change, so the hand pawl on the loader side such as a robot needs to be replaced. Have a point. The present invention has been made in view of the above problems of the prior art, and its object is to hold various works such as a round bar and a hexagonal member having different polygonal diameters with a constant phase. The present invention aims to provide a work holder having a centripetal mechanism capable of performing the work.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, a work holder of a work feeder according to the present invention is a work holder for a pallet of a work feeder for arranging pallets in a loop shape on a conveying path and sequentially conveying the pallets. A plurality of elongated holes are provided in the pallet board parallel to the center of the workpiece mounting in parallel to the equally divided radiation, and the plurality of clamp pieces, which can be repositioned along the plurality of elongated holes, are located at the positions on the radial line. A holding guide rod is provided vertically, and a work stand having an arcuate cam groove into which the holding guide rod is fitted and inserted in an impeller shape is provided rotatably around the workpiece mounting axis. The rotation of the work table causes the holding guide rods to move centripetally while maintaining the same phase.

[0005]

[Action]

 When the diameter of the work changes, loosen the bolts so that the clamp pieces can move along the oblong holes of the board, and manually rotate the work table to expand the holding guide bar to a size larger than the work diameter and place it on the work table. The work is temporarily placed, the work table is rotated, and the holding guide rod is centripetically moved by an equal amount to abut the outer circumference of the work and the bolt is loosened to fix the holding guide rod to the substrate.

[0006]

【Example】

 The present embodiment will be described below with reference to the drawings. In the work feeder shown in FIG. 4, a plurality of rollers 2 are arranged in a loop on the upper plate 1a of the frame 1 installed on the floor, and the chain is endlessly stretched at the center of the upper plate 1a. A plurality of pallets 4 fixedly attached to the roller 3 at equal intervals are movably supported by the roller 2. The pallet 4 is driven through the chain 3 by a sprocket wheel 6 fitted to a servo motor 5 fixed on the lower plate 1b of the frame 1 to sequentially index the pallet 4 to the transfer position a at the right end. ing.

As shown in FIG. 1, the board 7 of the pallet 4 has three elongated holes 7a formed in parallel with the three radiations bc equally divided with respect to the mounting center b of the work W. Holes 7b for lifters are provided at equal intervals on a concentric circle of the center b. A convex portion on the lower surface of the clamp piece is movably fitted into each elongated hole 7a, and the clamp piece 8 is fixed to the board 7 after position adjustment by a bolt 11 screwed to a T nut 9. ing. On the clamp piece 8, two holding guide bars 12 are vertically erected in close contact with each other so as to sandwich the radiation bc, and the upper ends of the two holding guide bars 12 are connected by a connecting plate 14. It is connected.

Further, three stepped pins 15 are fixed on the upper surface of the substrate 7 at equal intervals on a concentric circle of the mounting center b, and a disc-shaped work table 16 is rotated on the stepped pins 15. It is placed as possible. An arcuate penetrating cam groove 16a is engraved on the worktable 16 in an impeller shape around the mounting center b. The head of the bolt 11 is attached to the outer wall of the cam groove 16a and the inner wall of the cam groove 16a. One of the guide rods 12 is slidably in contact with the guide rod 12. A lifter 17 is attached to the upper plate 1a of the frame 1 at the transfer position a. As shown in FIG. 2, the lifter 17 has three support rods 18 penetrating through the holes 7b of the substrate 7 and extending upward and downward, and supported by the upper plate 7a so as to be vertically movable in the axial direction. A pinion 22 fitted to the output shaft of a servomotor 21 fixed to the back surface of the upper plate 1b is meshed with a rack 19 formed in one piece. A connecting plate 23 for connecting the three rods is fixed to the lower end of the supporting rod 18, and a bearing seat 24 is fixed to the upper end of the supporting rod 18 so that the works W stacked on the work table 16 can be lifted together with the work table 16. Has become.

Next, the operation of this embodiment will be described. First, the setup change for setting the hexagonal material work, which is relatively short with respect to the diameter, on the work table 16 will be described. First, loosen the bolts 11 so that the clamp pieces 8 can freely move along the elongated holes 7a, rotate the work table 16 counterclockwise to widen the guide rod 12 to be larger than the work diameter, and set the work W to the work table 16 When the work table 16 is temporarily placed on top and rotated clockwise, the holding guide bar 12 is centripetally moved in a contracting direction while maintaining an equal distance from the mounting center b. The three corners of the hexagonal bar are located in the center of a set of round bars with two guide bars 12, abutting against the holding guide bars with no gaps, and then adjusting the position so that they can move up and down, and then the bolt 11 is moved. Tighten to fix the clamp piece 8 to the substrate 7. When the position adjustment of the holding guide rods 12 of all the pallets 4 is completed in this way, the works W are multi-tiered at the center position of the holding guide rods 12 on the work table 16 and the preparation is completed.

Next, when cutting on the processing machine side starts, the servo motor 5 rotates in response to an NC command, the chain 3 rotates via the sprocket wheel 6, and the pallet 4 is indexed to the transfer position a. Then, the servo motor 21 rotates and the support rod 18 of the lifter 17 rises via the pinion 22 and the rack 19 to lift the work W along with the work table 16 along the proposed rod 12. When the uppermost workpiece W is raised to a predetermined position, a detection signal is output from a photoelectric sensor (not shown), the servomotor 21 is stopped, and the workpiece is kept in this posture until the cutting process is completed.

Next, when the cutting process is completed and the robot removes the uppermost work, the servo motor 21 rotates in the opposite direction and the lifter 17 descends. Then, the servo motor 5 rotates and the next pallet 4 is transferred to the delivery position. It is indexed to a. In the present embodiment, an example of holding a hexagonal work is described, but it is also possible to hold a multiple of 3 or a round bar, and in the case of a square or a pentagon, a slot 7a and a cam groove 16a are provided. It can be held by changing the number and the drilling position.

[0012]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. The holding guide rod, which determines the phase and position of the work, can be moved in the radial direction evenly divided with respect to the mounting center, and the guide rod is inserted into the arc-shaped cam groove provided on the work table, and the work table's Since the holding guide bar is moved by an equal amount to the mounting center of the work piece by turning to adjust the position, the position of the holding guide bar can easily be maintained in the same phase even if the diameter of the work piece changes. Since adjustment is possible, there is no phase shift due to setup change of polygonal work such as hexagonal material, and it is not necessary to replace the hand claws of the loader such as robot, and setup change becomes easy.

[Brief description of drawings]

FIG. 1 is a plan view of a pallet of a work feeder of this embodiment.

FIG. 2 is a side view of FIG. 1 showing a structure of a lifter.

FIG. 3 is a side view showing a pallet drive system.

FIG. 4 is an overall view of a work feeder, (a) is a plan view,
(B) is a side view.

FIG. 5 is a plan view of a conventional work feeder fixture.

[Explanation of symbols]

 2 roller 3 chain 4 pallet 7 substrate 7a long hole 12 holding guide bar 16 work table 16a cam groove

Claims (1)

[Scope of utility model registration request] 1. A work holder for a pallet of a work feeder for arranging pallets in a loop shape on a conveyance path and sequentially conveying the pallets, wherein the pallet substrate is equally divided with respect to a work mounting center. A plurality of elongated holes are provided in parallel with the holding guide rods, and the holding guide rods are vertically installed at the positions on the radial lines of the plurality of clamp pieces that are positionally changeable along the plurality of elongated holes, and the holding guide rods are fitted. A work table having an arcuate cam groove to be inserted in the shape of an impeller is provided so as to be rotatable around the work mounting axis. When the work table is rotated, the holding guide rods maintain the same phase and are centered equally. Work holder of the work feeder characterized by moving automatically.