JPH0239714Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention is used in the technical field of machine tools, and particularly relates to a device for loading and unloading a workpiece onto a worktable.

(Prior art) Numerical control (NC) machine tools, etc. are equipped with a conveyor near the work table for loading and unloading workpieces, and the workpieces are sequentially transferred and set on the machine tool for processing. It is structured like this. However, when a workpiece set on a machine tool has many parts to be machined in different positions, it requires space for turning and reversing the workpiece, so the conveyor is placed at a certain distance from the worktable. It is set aside. Therefore, a relay means such as a relay conveyor is required in the space, and conventionally, a relay conveyor is provided attached to the work table side. However, each of these conveyors is often formed by a roller conveyor, for example, and when a workpiece is processed on a work table, flying objects such as chips adhere to the surrounding relay conveyor or transport conveyor.
These flying objects get stuck inside each conveyor and impair its function, which not only makes maintenance of the conveyor troublesome, but also poses a risk of damaging the workpieces being transported. Furthermore, in order to maintain safety during workpiece processing, an opening/closing door is required between the work table and the conveyor, but since such an opening/closing door is an independent piece of equipment, it must be closed during workpiece processing. However, there is a problem in that it involves troublesome work such as opening it when transporting the workpiece.

It should be noted that a mechanism for unlocking the safety cover of a processing machine in conjunction with the backward movement of the work head or tool head is known from Japanese Utility Model Application Publication No. 17145/1983.

(Purpose of the invention) In view of the above-mentioned conventional problems, this invention is designed to evacuate the relay conveyor from the vicinity of the workpiece processing position during workpiece processing, and to prevent flying debris by using an opening/closing door that operates simultaneously with the relay conveyor. To provide a workpiece loading/unloading device which prevents workpieces from adhering to a conveyor.

(Structure of the invention) A means for achieving the object of this invention is a conveyor provided along a work table on which a work is placed, and a workpiece interposed at a relay position between the conveyor and the work table. It consists of a relay conveyor that carries workpieces in and out of the table, and the relay conveyor is provided so that it can move toward and away from the worktable, and the relay conveyor has an opening/closing door that opens and closes the relay position between the worktable and the transport conveyor. are integrally provided in such a positional relationship that the relay position is closed when the relay conveyor is at the retreat position away from the work table, and the relay position is opened when the relay conveyor is at the work loading/unloading position connected to the work table. The present invention relates to an apparatus characterized in that it is provided with a drive means for operating a relay conveyor between a retracted position and a workpiece loading/unloading position.

The effect of the above means is that the relay conveyor is evacuated during processing by the machine tool, and at the same time, the opening/closing door that covers the transfer conveyor is closed to block flying objects from the work table side.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. In addition, in FIG. 1, the direction in this description is referred to as the lower side as the front and the upper side as the rear side.

A workpiece loading/unloading device 1 according to the present invention includes a conveyor 4 that conveys a workpiece 3 along a numerically controlled machine tool 2.
The main components include a relay conveyor 5 that relays and transfers the workpiece 3 between the work table 2a and the conveyor 4, and an opening/closing door 6 formed integrally with the relay conveyor. is the jig stand 7 for placing the workpiece 3.
are installed interchangeably. The conveyor 4
are provided at a distance from the work table 2a and in the left-right direction along the transport conveyor, and a relay conveyor 5 is provided at a relay position between the transport conveyor 4 and the work table 2a. A downwardly extending opening/closing door 6 is integrally formed at the lower part of the relay conveyor, and the relay conveyor 5 has an evacuation level at the top position (shown by the solid line in Figure 2) and a work loading/unloading level at an intermediate position (Figure 2). It is possible to position it in three positions: the lowermost jig exchange level (shown by the one-dot chain line in FIG. 2) and the lowest jig exchange level (shown by the one-dot chain line in FIG. 2).

The details of each part will be further explained below.

The work table 2a is provided on the work table 2b, and is formed so that the jig table 7 can be fixed thereto. The turntable 2b is rotated by a cylinder device 2c. 2d is a spindle of the numerically controlled machine tool 2, which is movable back and forth, left and right, and up and down.

The works 3 are, for example, cylinder heads of semi-finished products, and are sequentially prepared on a work pool 2e (see FIG. 1) provided on the left side of the conveyor 4, and are placed in a cylinder device 2g provided on a work table 2a. is pressed onto the jig table 7 and fixed.

Jig stands 7 corresponding to the shapes of various workpieces 3 are prepared in the jig stand storage area 2f.

The conveyor 4 is configured as a free roller conveyor, and is divided into an upstream (right side in FIG. 1) conveyor 4a and a downstream (left side in FIG. 1) conveyor 4b. The upstream end of the upstream conveyor 4a is a work pool 2e.
The downstream end of the downstream conveyor 4b is connected to the next processing step. Also, the upstream conveyor 4a
The width of the opposing portion of the downstream conveyor 4b is reduced and is configured as a movable conveyor 4d pivotally supported by a hinge 4c, and the movable conveyor is capable of flipping it upward. This is to open the front of the relay conveyor 5, which is located at a lower jig table exchange level than the movable conveyor 4d, and to facilitate handling of the jig table 7 placed on the relay conveyor.

The relay conveyor 5 has guides 5 installed on the left and right sides.
a, 5a, and its vertical position is controlled by a driving means 5b such as a cylinder device, and the front part of the relay conveyor 5 is free in the same direction as the conveyor 4. A conveyance auxiliary conveyor 5c consisting of a roller conveyor is formed so as to be located coaxially with the movable conveyor 4d, and the rear part is connected to a free roller conveyor in the front and rear direction for connecting the conveyance auxiliary conveyor 5c and the work table 2a. A relay conveyor main body 5d is formed. Further, a leg 5e is provided at the lower part of the relay conveyor 5 to protrude downward, and the protruding length of the leg 5e is adjusted by a screw means. The driving means 5b includes a first confirmation switch 5f for confirming that the relay conveyor 5 is at the uppermost position;
A second confirmation switch 5g is provided to confirm that the relay conveyor 5 is at the intermediate position, and a third confirmation switch 5h is provided on the guide 5a to confirm that the relay conveyor 5 is at the lowest position. .
Furthermore, a protrusion 5j is provided on the front upper part of the relay conveyor 5 to removably fit a stopper 5i for guiding the transfer of the jig table 7 during replacement.

The opening/closing door 6 is constructed by attaching a transparent plate 6b to a frame 6a that is integrated with the relay conveyor 5 and extends downward. The tip of the piston rod of the driving means 5b is
It is hinged to the tip of a bracket 6c provided integrally with the frame 6a of the opening/closing door 6, and is configured such that the relay conveyor 5 is moved up and down by the expansion and contraction movement of the drive means 5b. Furthermore, the guide 5a includes:
When the relay conveyor 5 is in the intermediate position,
A positioning stopper 5k (see FIG. 3) is provided which engages the lower end of the bracket 6c. The positioning stopper 5k is configured so that it can be disengaged from the bracket 6c when the relay conveyor 5 is further lowered from the engaged position.

Next, the operation of this embodiment will be described.

In Figures 1 to 3, the relay conveyor 5
is at the highest evacuation level, and relay conveyor 5
The opening/closing door 6, which is integrated with the work table 2a, is in a state of vertically closing the front of the work table 2a.
While it functions as a safety cover when processing the workpiece 3 with the tool (not shown) attached to d, the scattering objects such as chips generated at this time are blocked by the opening/closing door 6, so that the conveyor There are no scattered objects attached to 4. Of course, since the relay conveyor 5 is also located at a distance above, there is no possibility of flying objects adhering to it.

When machining of workpiece 3 is completed, cylinder device 2g
At the same time, the work 3 is released from being fixed, and the driving means 5b is operated to lower the relay conveyor 5. And the bracket 6c is the positioning stopper 5.
k, and by the operation of the second confirmation switch 5g, the relay conveyor 5 is controlled to the intermediate position shown by the two-dot chain line in FIG. 2, that is, to the workpiece loading/unloading level. In this state, the top surface of the rollers of the relay conveyor 5 is aligned with the top surface of the transport conveyor 4 and is at a position slightly higher than the top surface of the jig table 7. At this time,
The opening/closing door 6 is lowered to open the relay position. Then, the workpiece 3 is placed on the relay conveyor main body 5d of the relay conveyor 5 from the jig table 7 and transferred to the front, and then transferred to the transfer auxiliary conveyor 5c and the movable conveyor 4d.
and sent to the next process by the downstream conveyor 4b.

Next, the unprocessed work 3 is carried in from the work pool 2e by the upstream conveyor 4a, the movable conveyor 4d, and the auxiliary conveyor 5c, and is placed in front of the work table 2a by the relay conveyor main body 5.
d, and after being positioned on the jig table 7, it is fixed on the jig table 7 by the cylinder device 2g. And relay conveyor 5
is raised by the operation of the drive means 5b, and the relay conveyor 5 is controlled to the uppermost position by the operation of the first confirmation switch 5f, the opening/closing door 6 is closed, and the same processing operation as described above is performed. It can be done.

A large number of works 3 having the same shape prepared on the work pool 2e are sequentially processed by repeating the above operations.

On the other hand, when the shape of the workpiece 3 is changed and it becomes necessary to replace the jig table 7, the positioning stopper 5k is retracted so as not to engage the bracket 6c, and the movable conveyor 4d is moved along the two-dot chain line in FIG. After flipping up the jig table as shown in , the driving means 5b is activated, and the relay conveyor 5 is lowered until the third confirmation switch 5h is activated, and the jig at the lowest position is removed. Position it at the table exchange level (see the one-dot chain line in Figures 2 and 3).
At this time, the top surface of the relay conveyor 5 is at a position slightly higher than the top surface of the work table 2a. Further, the length of the leg 5e is adjusted so that the lower end thereof comes into contact with the upper surface of the turntable 2b, so that the leg 5e serves as a support when the heavy jig table 7 is placed on the relay conveyor 5. Further, a stopper 5i is fitted onto the protrusion 5j to guide the jig table 7 during transfer (see FIG. 4). Then, the jig table 7 on the work table 2a is removed, placed on the relay conveyor 5, and returned to the jig table storage area 2f, and the jig table 7 of a different shape is placed on the work table 2a via the relay conveyor 5. , and fix it to complete the replacement of the jig stand 7.

In this embodiment, the relay conveyor 5 includes the transport auxiliary conveyor 5c and the relay conveyor 5d, but it is also possible to use only the relay conveyor 5d. Further, the movable conveyor 4d may be slid laterally so as to avoid any hesitation when replacing the jig table 7. Further, the opening/closing door 6 may be integrally provided at a position other than the lower part of the relay conveyor 5, and the relay conveyor 5 can be moved up and down to evacuate from the work table 2a, and can also be evacuated by moving horizontally from side to side. You can do it like this. Further, it is also possible to carry out an implementation in which the workpiece 3 is transferred while being attached to the jig stand 7 and then transferred to the worktable 2a.

(Effects of the invention) As in the above-mentioned configuration, the present invention comprises a transport conveyor and a relay conveyor interposed at a relay position between the transport conveyor and the work table.
When the relay conveyor is in the evacuation position away from the work table, the relay position is closed by the opening/closing door, and when the relay conveyor is in the work loading/unloading position connected to the work table, the relay position is opened, and the relay position is closed during processing. Since flying debris such as chips flying from the work table side does not adhere, it not only makes maintenance management of the equipment easier, but also ensures safety, and also improves work efficiency when loading and unloading workpieces. be. Moreover, only a single driving source is required, and the device can be simple.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is a plan view of the workpiece loading/unloading device, FIG. 2 is a side view partially shown in cross section, FIG. 3 is a front view of the same, and FIG. It is a side view which expanded and showed a part of relay conveyor. 1... Work loading/unloading device, 2a... Work table, 3... Work, 4... Transfer conveyor, 5...
...Relay conveyor, 5b...Driving means, 5c...Transfer auxiliary conveyor, 5d...Relay conveyor main body, 6
...Opening/closing door.

Claims (1)

[Scope of utility model registration request] The relay conveyor consists of a conveyor provided along the work table on which the work is placed, and a relay conveyor that is interposed at a relay position between the conveyor and the work table to carry the work into and out of the work table. is provided so as to be movable toward and away from the work table, and the relay conveyor has an opening/closing door that opens and closes the relay position between the work table and the transfer conveyor, and when the relay conveyor is in the retracted position away from the work table, the relay conveyor opens and closes the relay position. It is integrally provided in such a positional relationship that the relay position is closed and the relay position is opened when the relay conveyor is at the workpiece loading/unloading position connected to the work table, and the relay conveyor is moved to the retreat position and the workpiece loading/unloading position. A device for loading and unloading a work onto a work table, characterized in that a means is provided.