JPH0115493Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> This invention is based on a table that is movable back and forth on the bed, and a pallet with a workpiece mounted thereon is automatically moved from one side of the bed in a direction perpendicular to the movement of the table. The present invention relates to a dustproof cover device for protecting the top surface of a table when a pallet is not mounted on the table in a machine tool that is carried in, mounted on a rack, or removed and carried out.

<Prior art> Recently, large tables such as large portal machine tools, such as vertical boring machines, plano milling machines, or large horizontal boring machines, are used to feed cutting only in the longitudinal (back and forth) direction on the bed. In machine tools as well, labor saving,
For unmanned work or even multiple-machine line work, workpieces are attached to pallets in advance at a setup station, transported and automatically placed on the machine table, and the pallets removed after processing are transferred to the next process machine. The application of a production method that automatically attaches and detaches parts by transferring them to other parts is expanding. In small machining centers where pallet exchange systems are already widely used, the pallet seating surface of the table is often the upper surface of two narrow rail-shaped guideways, but new and old pallets can be exchanged continuously. Because the work area of the table is often separated from the surrounding area by a splash guard room, protection of the seating surface such as the guideway on the table top is more important than dust prevention from the outer periphery of the machine while the machine is cutting. The main purpose is to prevent the intrusion and adhesion of cutting chips and contaminated cutting fluid. Even in large machines, if the machine has a pallet holder on both sides of the bed with a table in between, and two pallets are attached to and removed from the table interchangeably, the time that the top surface of the table is exposed is extremely short. .

However, as mentioned above, the machine structure and line configuration in which pallets are carried in and mounted on the table from one side of the bed, and then separated and carried out before the next new pallet is carried in and mounted, are also used depending on the content of production. . In this case, the pallet guide path and seating surface on the top of the table will be exposed until the processed pallet is separated and carried out from the table and the next new pallet is carried in and mounted, preventing contamination from floating chips and dust on the outer periphery. Become defenseless. In particular, this dust accumulation continues even when the machine is stopped or not in operation, so protective measures such as covering the table with cloth are carried out as a countermeasure, but if the table size is large, repeating this work is complicated and is a safety issue. Also requires caution.

<Purpose> In view of the above, the present invention uses the automatic pallet exchange function to cover the table with a protective cover at the same time as the pallet is removed from the table. It is an object of the present invention to provide an automatic dustproof cover device with a simple structure that can be stored in a vehicle.

<Example> Hereinafter, details of the present invention will be described with reference to an example. First, the automatic pallet exchange mechanism of the machine to which this cover device is applied will be described. That is, bed 1
A table 2 can be reciprocated on the top in the axis X direction (back and forth direction), and a pallet holder 3 is installed along one side of the front end position of the table feeding stroke. A pallet 4 is placed on the top surface of the pallet holder 3.
A plurality of guide rails 7 are provided in the Y-axis direction (horizontal direction) perpendicular to the feeding direction of the table 2 and are close to the side edges of the table 2, and the top surface of the rails 7 is slightly lower than the top surface of the table. has been done. Further, lift cylinders 8 are provided at four locations on the rail section, and are configured to receive pallets 4 carried in by another conveyance means and set them at fixed positions on the pedestal. Further, on the upper surface of the table 2, there is a guide rail 7 of the pallet holder 3 when the table 2 is at the front end stop position of the stroke in the X-axis direction.
A guide rail 9 of the same shape is provided in the Y-axis direction so as to be linearly continuous with the guide rail 7, and its upper surface is at the same height as the guide rail 7 and slightly lower than the table surface. A total of four pallet clamp devices 10 are provided near both ends of the guide rail 9, a pallet positioning pin device 11 is provided on the top surface of the table, and a stopper 12 is provided on the outer surface. Roller units 13 are provided at four locations on the lower surface of the pallet 4 and are able to roll along the upper and inner surfaces of the guide rails 7 and 9, so that the pallet 4 can be smoothly moved between the pedestal and the table. I have to.

A pallet transfer device 5 is attached to the side surface of the pallet holder 3 and the front end of the table, and a feed screw 14 is pivotally supported in the Y-axis direction on the transfer device 5. rotated,
A concave engaged piece 17 connected to a nut 16 screwed into the screw 14 is capable of reciprocating in the Y-axis direction. On the other hand, a convex engaging piece 18 is fixed to the front end of the pallet in the X-axis direction, and engages with the concave engaged piece 17 of the transfer device 5, so that the pallet is moved in the Y direction by the operation of the transfer device 5. It is like that.

Next, the automatic dustproof cover device according to the present invention will be explained. In this, the cover pedestal 19 of the cover device 6 is separately placed close to the table 2 on the opposite side of the pallet pedestal 3 on one side of the front end of the bed 1. The pedestal 1
Two guide rails 20 are provided on top of the table 9, and are connected in a straight line with the guide rail 9 on the upper surface when the table 2 is at the pallet exchange position at the front end of the X-axis feed. A plurality of protective covers 21 made of iron plates are telescopically supported on the rails 20 of the cover pedestal 19 by roller units 22.
An L-shaped hook receiver 23 with an open top is fixedly installed in the center of the front face of the end cover near the table. On the other hand, a hook 24 having a downward claw is provided on the central side surface of the pallet 4 on the cover device side, and is adapted to engage with a hook receiver 23 on the cover side. The hook 24 is held by a bracket 25 fixed to the pallet 4 so as to be able to swing freely around a front-rear shaft 26, and a roller 27 is supported at the opposite end of the claw portion and rolls in contact with the top surface of the table when the pallet is moved. It is like that. Furthermore, this hook 24 has a hollowed out portion 29 formed at a position near the claw, and a roller 27 at the rear of the hook.
Care has been taken to ensure that the direction is always downward. A groove 3 is located at the center of the top surface of the pallet holder 3 near the table.
0 is provided, and a hook hooking/unhooking block 31 is provided in the groove.
is fitted, the upper surface of which is the same as the upper surface of the table, one end of which is close to the table, and the other end of which is inclined downward. That is, when the pallet 4 is carried onto the table top surface, the hook 24
The hook engaging/disengaging means for engaging the hook 24 with the hook receiver 23 and disengaging the hook 24 from the hook receiver 23 when the pallet 4 is carried out from the table top surface is as follows:
It is composed of the roller 27, a groove 30 at the table side end of the pallet holder 3, a hanging block 31, and the like. Note that 32 is a gutter fixed to the outer periphery of the pallet.

Next, I will explain the effect. First, to describe the pallet exchange operation, the pallet 4 is carried into the opening of the pallet holder 3 by another unmanned or manned conveyance means such as buried line guidance or rail running.
It is received by the lifting cylinder 8 of the pedestal 3 and lowered onto the guide rail 7. At this time, the concave engaged piece 17 of the transfer device 5 is waiting at a position directly below the convex engaged piece 18 of the pallet 4, and as the pallet is lowered, the convex engaged piece 18 is moved to the concave engaged piece. By engaging the piece 17 and rotating the feed screw 14, the pallet 4 is transferred from the pedestal to the table in the Y-axis direction along the guide rail and stopped at a predetermined position on the table. At this point, the clamping device 10 is activated and the pallet is lowered by a minute amount, and its lower surface is brought into contact with the top surface of the table and fixed. In response to the next command, the table is sent in the X-axis direction for machining work, but the convex engaging piece 18 on the pallet side is freely separated from the concave engaged piece 17 of the transfer device 5. When the machining operation is completed, the pallet 4 returns to the end of the bed 1 together with the table 2, and the convex engaging piece 18 re-engages with the concave engaged piece 17. Thereafter, the pallet is transferred from the table to the pallet holder 3 by the reverse procedure to the above, and is carried out of the machine by another conveying means, and then the next new pallet is carried in, and the pallet holder 3 is moved. It is received and transferred to the table.

Next, the operation of the cover device will be explained. As shown in FIG. 6, the protective cover 21 of the cover device 6 is extended on the table 2. A pallet 4 is introduced onto the pallet pedestal 3 by external means, received by the lifting cylinder 8, lowered and placed on the guide rail. At this time, the pallet 4 is engaged with the pallet transfer device 5 in the Y-axis direction by the concave engaged piece 17 and the convex engaging piece 18. Subsequently, when the transfer device 5 is driven to move the pallet toward the table, the roller 27 of the hook 24 at the tip of the pallet is raised by the slope of the hanging block 31, and the claw of the hook 24 touches the hook of the cover 21. Uke 2
Multiply by 3. As the pallet 4 moves toward the table, the cover 21 moves from the hook receiver 23 to the hook 2.
When the pallet 4 has completed its movement onto the table, the cover is compressed and stored on the cover holder 19. Next, when the pallet 4 travels on the bed 1 together with the table 2 in the X-axis direction, the hook 24 freely comes out of the hook receiver 23, and the cover remains on the bed as it is.

During cutting, the table surface is protected from dust by the pallet 4 and the gutter 32 around its outer periphery. When the pallet 4 returns to the front end of the bed together with the table 2 after the cutting process is completed, the hook 24 of the pallet re-engages with the hook receiver 23 of the cover.
At this time, the convex engaging piece 18 of the pallet engages with the concave engaged piece 17 of the pallet transfer device 5 at the same time.
Therefore, when the transfer device 5 is activated in response to a command to carry out a pallet, the cover 21 of the cover device 6 is pulled by the pallet and pulled out onto the table, and the roller 27 of the hook 24 is moved to the position where the cover 21 has finished being spread on the table.
However, as the hooking block 31 on the pallet holder 3 descends on the slope, the cover is disengaged from the hook holder 23 and the cover 21 stops. The pallet 4 moves further outward and stops at the delivery position with the external conveyance means. Thereafter, the application of the dustproof cover to the table top surface is repeated in conjunction with the loading and unloading of pallets from the table, so that the table top surface is not exposed.

<Effects> As is clear from the above explanation, the present invention has a table that can be moved forward and backward on the bed,
In a machine tool equipped with a pallet pedestal provided on one side of a bed, and a pallet that can be carried in and out from the pallet pedestal to the top surface of the table in the left-right direction by a transfer device, the pallet pedestal is placed on either side of the bed. a cover pedestal disposed on the opposite side of the pallet, a protective cover movable from the cover pedestal to the top surface of the table, and a hook pivotally attached to the table side end of the pallet so as to be able to swing around a longitudinal axis. a hook holder that is fixed to the table side end of the protective cover and allows the hook to move back and forth when the hook is engaged; and a hook holder that engages the hook with the hook holder when carrying the pallet onto the table top surface. A hook engaging/disengaging means is provided for detaching the hook from the hook holder when the pallet is carried out from the table top surface, and the hook engaging/disengaging means is disposed at the table side end of the pallet holder. That is.

Therefore, according to the present invention, in a machine tool that transfers and exchanges pallets from a pallet holder on one side of the bed to a table, the protective cover on the top of the table can be deployed or retracted without delay by utilizing the pallet transfer means. Therefore, no effort or consideration is required for handling, no special power or drive equipment is required, and the reference top surface of the table can be reliably, economically and effectively prevented from contaminating the environmental air of large machines. can be protected.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a dustproof cover device showing an embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a plan view showing an engaged state of the hook and hook receiver, and Fig. 4 is a side view of the same. 5 is a side view showing the engaged and disengaged state of the hook, and FIG. 6 is a plan view showing the entire machine tool. 1: bed, 2: table, 3: pallet pedestal, 4: pallet, 5: transfer device, 19: cover pedestal, 21: cover, 23: hook holder, 24: hook, 26: front and back axis, 27: roller , 31: Engagement block.

Claims (1)

[Scope of utility model registration request] The table includes a table that can be moved forward and backward on the bed, a pallet holder provided on one side of the bed, and a pallet that can be carried in and out from the pallet holder to the top surface of the table in the left and right directions using a transfer device. In the machine tool, a cover pedestal disposed on the opposite side of the pallet pedestal across the bed, a protective cover movable from the cover pedestal to a table top surface, and a table side end of the pallet. a hook fixed to the table side end of the protective cover so as to be able to swing about a front-rear axis; a hook holder fixed to the table-side end of the protective cover to allow the hook to move in the front-rear direction when the hook is engaged; and a top surface of the table of the pallet. A hook engaging/disengaging means is provided for engaging the hook with the hook holder when the pallet is carried into the table and disengaging the hook from the hook holder when the pallet is carried out from the top surface of the table. An automatic dustproof cover device for a work table, characterized in that it is arranged at the table side end of the pedestal.