JPH0333401Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a simple work loader suitable for automatically supplying workpieces to NC lathes and other automatic processing machines in which the chuck moves vertically to chuck the workpiece. It is.

Prior Art With the aim of perfecting the NC lathe, the applicant has fundamentally changed the arrangement of the main parts of the lathe body, making it easier to automatically attach and detach workpieces, and to make cutting easier and easier. We have already proposed an NC lathe that can perform reliable processing and easily realize complete automation of turning processing, and have successfully put it into practical use.
(See No. 132730).

The NC lathe according to the above-mentioned application has a headstock that is vertically disposed along a vertically erected bed so as to be able to slide up and down, and the lower end of the main shaft that is vertically disposed on the headstock and rotatably supported. An automatic chuck is installed.

Purpose of the invention This invention is designed to load a workpiece into an automatic processing machine, such as the above-mentioned NC lathe, in which the main shaft moves in the vertical direction (Z-axis direction) and the workpiece is gripped by an automatic chuck attached to the lower end of the main shaft. The purpose is to provide a simple workload loader suitable for automatic feeding.

Structure of the invention The structure of the invention taken to achieve the above-mentioned object is such that the tips of the arms that make a turning movement or a linear reciprocating movement between a standby position, a workpiece receiving position, and a workpiece supplying position on a horizontal plane are arranged in close proximity to each other. It has two receiving trays, one for supply and one for receiving, which are arranged as follows.
Each of the saucers is fixed to the upper end of a support rod that is fitted into a mounting hole provided vertically through the arm, and the support rod is fitted into the mounting hole so as to be freely movable and vertically movable. A stopper is provided at the lower end of the stopper and includes a guiding tapered part and a cylindrical part that is continuous with the guide taper part and closely fits into the mounting hole, and the stopper is supported by a spring interposed between the arm and the receiving plate. As the rod and the saucer are urged upward, the cylindrical portion of the stopper is tightly fitted into the mounting hole, so that the support rod is positioned and held concentrically with respect to the mounting hole. It is characterized by

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. Figure 1 shows an NC lathe equipped with a simple work loader according to the present invention, where 1 is a bed;
It is vertically installed on a foot stand 2.

Reference numeral 3 denotes a headstock, which is disposed so as to be slidable up and down along the bed 1 via a linear guide (not shown), and can be freely moved up and down by a well-known feeding mechanism using a servo motor and a ball screw. There is. Reference numeral 4 denotes a main shaft which is vertically disposed on the headstock 3 and rotatably supported, and an automatic chuck 5 is attached to the lower end of the main shaft so as to face downward. The main axis 4 is defined as the Z axis. The headstock 3 has a built-in rotation drive device for the main shaft 4, and is also provided with a chuck opening/closing device 6.

Reference numeral 7 denotes a tool rest, which is disposed so as to be slidable left and right in the X-axis direction perpendicular to the Z-axis along a cross guide (not shown), and can be freely moved in the X-axis direction by a well-known feeding mechanism using a servo motor and a ball screw. It is now possible to be moved. A rectangular turret head 8 is attached to the tool rest 7, and the turret head 8
A plurality of tools 10 are attached to a comb-shaped holder 9 provided on four sides of the holder. Tarot head 8
is rotated and indexed in 90 degree increments around the X axis by an indexing device built into the tool rest 7.

In the above configuration, the workpiece W supplied directly below the spindle 4 is chucked by the automatic chuck 5 which approaches the workpiece W as the headstock 3 moves along the Z-axis, and then the spindle 4 rotates and is chucked. By freely moving the headstock 3 in the Z-axis direction and the tool rest 7 in the X-axis direction while imparting rotational motion to the workpiece W, turning is performed on the workpiece W with a tool indexed at a predetermined position. will be held. The chips generated during this machining fall naturally due to their own weight, are stored in a chip storage opening provided in the base 2, and are centrally processed. At this time, since the workpiece W is held in a downward posture, chips will not become entangled with the workpiece W.

Reference numeral 11 denotes a work loader that automatically supplies the workpiece W to the supply position directly below the spindle and takes out the completed workpiece _W1 , and an arm 1 that rotates between the supply position and the standby position of the workpiece W on a horizontal plane.
It has 2. The distal end portion of the arm 12 is formed into a T-shape, and a supply tray 13 and a receiving tray 14 are disposed close to each other at both ends of the T-shaped portion 12a. Base end boss portion 1 of arm 12
2b is rotatably supported on a support shaft 16 provided upright on a mounting base 15 (fixed to the leg base 2), and a link 17 connected to the boss portion 12b connects to the air cylinder 1.
8 piston rod 18a.

The air cylinder 18 is pivotally connected to a bracket 19 whose base end is fixed to the mounting base 15, and has a two-step stroke of a long stroke and a short stroke.The operation of the air cylinder 18 causes the arm 12 to It is configured to pivot from a standby position shown by a phantom line A in FIG. 2 to a work receiving position shown by a phantom line B, and further from the receiving position B to a work supplying position C shown by a solid line. In addition,
In FIG. 2, 20 is a proximity switch that detects whether or not a workpiece W is accommodated in the supply tray 13 located at the standby position A, and operates the air cylinder 18 only when the workpiece W is accommodated. It's getting old.

The above-mentioned workpiece supply and receiving trays 13, 1
4 are support rods 21, respectively, as shown in FIG.
It is fixed to a mounting plate 22 provided at the upper end with a set screw 23, and a pin 24 for fitting a workpiece is provided protruding from the center. The trays 13, 14 and pin 24 are replaced according to the shape of the workpiece W.

The support rod 21 has a narrow diameter portion 21a in the middle portion, and a straight shaft portion 21b having a larger diameter than the narrow diameter portion 21a is connected below the narrow diameter portion 21a. The support rod 2
1 is fitted into a mounting hole 25 provided vertically through the arm 12 so as to be freely movable and vertically movable, and a pin 27 is engaged with a vertical groove 26 provided on the side surface of the straight shaft portion 21b. As a result, vertical movement is limited to a certain range, and rotational movement is prevented. Further, a stopper 28 that tightly fits into the mounting hole 25 is fixedly attached to the lower end of the support rod 21 with a screw 30. The stopper 28 includes a guiding tapered portion 29 for smoothly fitting into the mounting hole 25, and a cylindrical portion 35 that is continuous with the guiding tapered portion 29 and tightly fitting into the mounting hole 25.

31 is a spring inserted into the support rod 21 and interposed between the arm 12 and the saucer 13 or 14;
The spring 31 urges the support rod 21 and the receiving plate 13 or 14 upward, as shown by the solid line in FIG. At the same time, the cylindrical portion 35 of the stopper 28 is tightly fitted into the mounting hole 25, so that the support rod 21 is positioned and held concentrically with respect to the mounting hole 25. Therefore, the saucer 13 or 14 and the support rod 2
1 against the spring 31, and press down the small diameter part 2.
1a is positioned in the mounting hole 25, the support rod 21
is in a floating state with respect to the mounting hole 25, and as shown by the imaginary line in FIG.
Or 14 becomes tiltable.

The operations of the headstock 3, tool rest 7, and work loader 11, the rotation speed of the spindle 4, the opening/closing operation of the automatic chuck 5, and the rotation indexing operation of the turret head 8 are all controlled by the numerical controller 32 (see Fig. 1). controlled.

Next, the operating order of the workload loader 11 having the above configuration will be explained.

1 and 2 show a state in which the arm 12 has pivoted to the supply position C shown by the solid line in FIG. 2, and the workpiece supply tray 13 is located directly below the main shaft 4. In this state, the headstock 4 is lowered, and the automatic chuck approaches the workpiece W and grabs it, as shown by the imaginary line in FIG. At this time, the work W
Even if the axis of the automatic chuck 5 and the axis (Z-axis) of the automatic chuck 5 do not exactly match, when the automatic chuck 5 pushes down the tray 13 through the workpiece W against the spring 31, the support rod will move as described above. 21 can be tilted with respect to the mounting hole 25, the workpiece W is automatically positioned relative to the automatic chuck 5 and chucked in the correct posture.

Next, when the headstock 3 rises and the automatic chuck 5 chucking the workpiece W leaves the supply tray 13, the arm 12 moves to the standby position shown by the imaginary line A in FIG. At this standby position, the processed workpiece _W1 stored in the receiving tray 14 is taken out by hand or by a robot and transported to the next process. On the other hand, when the workpiece W to be processed is put into the empty supply tray 13 by hand or by a robot,
The proximity switch 20 detects this and the standby preparation is completed. During this time, as mentioned above, the main shaft 4 rotates and the headstock 3 moves up and down in the Z-axis direction.
The tool post 7 moves in the X-axis direction and the workpiece W is turned.

When the machining is completed, the rotation of the spindle 4 is stopped, and the headstock 3 and the tool rest 7 return to the positions shown in FIG. 1 and stop. Subsequently, the arm 12 is moved along the imaginary line B in FIG.
Rotate and move to the workpiece receiving position shown in . At this receiving position, the workpiece receiving tray 14 is located directly below the main spindle 4, and the automatic chuck 5, which has been lowered to the position shown by the imaginary line in _FIG . let When the reception of the workpiece _W1 is completed, the arm 12 further turns and moves to the supply position C, and the supply tray 13 is positioned directly below the main shaft 4 again, and the above operation is repeated thereafter.

In the embodiment described above, the arm is configured to rotate and move from the standby position to the work supply position, but the arm 12 may also be configured to move linearly and reciprocally.

Effects of the Invention As described above, in the work loader of the present invention, the feeding and receiving trays are disposed close to each other at the tip of the arm, so that the workpiece can be moved from the workpiece receiving position B to the workpiece supplying position C. Since the moving distance is short, receiving and delivering workpieces W can be carried out efficiently.

Further, when the support rod is pushed down against the spring, the tray can be tilted with respect to the arm, so that the automatic chuck that has descended vertically can contact the workpiece W and push it down. is automatically positioned with respect to the automatic chuck, while the cylindrical portion of the stopper is tightly fitted into the mounting hole at normal times, so that the tray is positioned and held in the correct posture without fear of accidentally tilting. Ru. Moreover, the device is simple and its operation is reliable. In particular, since vertical movement (Z-axis movement) of the main shaft to which the automatic chuck is attached is used to transfer the workpiece W, no special movement mechanism is required on the loader side.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Figure 1 is a front view of an NC lathe equipped with a work loader according to the present invention, Figure 2 is an enlarged view taken along line 2-2 in Figure 1, and Figure 3 is an enlarged view taken along line 2-2 in Figure 1. The figure is a partially enlarged vertical front view of the main part. 3... Headstock, 4... Main spindle, 5... Automatic chuck, 7... Turret post, 11... Work loader, 1
2... Arm, 13... Work supply tray, 1
4... Work receiving tray, 21... Support rod,
22...Mounting plate, 25...Mounting hole, 28...Stopper, 29...Tapered portion, 31...Spring.

Claims (1)

[Claims for Utility Model Registration] (1) A work loader that supplies workpieces to an automatic processing machine with an automatic chuck attached to the lower end of a vertically moving main shaft, which has a standby position, a workpiece receiving position, and a workpiece on a horizontal surface. An arm 12 that rotates or reciprocates linearly between supply positions has two trays 13 and 14 for supply and reception disposed close to each other at the tip thereof, and the trays 13 and 14 are It is fixed to the upper end of a support rod 21 that is fitted into a mounting hole 25 provided vertically through the arm 12, and the support rod 21 is fitted into the mounting hole 25 so as to be freely movable and vertically movable. A stopper 28 is provided at the lower end of the guide tapered portion 29 and a cylindrical portion 35 that is continuous with the guiding tapered portion 29 and tightly fits into the mounting hole 25, and is provided between the arm 12 and the receiving plates 13 and 14. The support rod 21 and the trays 13, 14 are urged upward by the interposed spring 31, and the cylindrical portion 35 of the stopper 28 is tightly fitted into the mounting hole 25, so that the support rod 21 is attached to the mounting hole 25. A simple work loader characterized by being positioned and held concentrically with respect to a hole 25. (2) A utility model registration request that is provided with a detection means 20 that is disposed close to the supply tray 13 and detects the presence or absence of a workpiece W on the tray 13 when the arm 12 is in a standby position. The simple workload loader described in item 1.