Laser beam machining device

Abstract: A laser beam machining device has a working head with a laser beam irradiation part, and a movable table for setting an iron plate or a work. On the upper surface of said movable table, driving rollers such as iron rollers are provided in parallel to each other, and said movable table has on its either side a cramp device for fixing a setting plate for setting said iron plate or work. The provision of said driving rollers on the upper surface of said movable table enables the automatic carrying in of said iron plate or work, and its carrying out together with the product by the driving rollers, contributing to the labor saving.

Description: Field of the Invention This invention relates to a laser beam machining device for processing a work-piece with laser beams. Background of the Invention In the past, a device for machining a work-piece with laser beams with the work-piece being fixed on a movable table has been proposed in Japanese Utility Model Publication No. 57-54952 and the like. Such a laser beam machining device has needle work-piece support parts on the movable table, a work-piece laid on and fixed to the work-piece support parts is irradiated with laser beams from a working head and machined, and the resulting comparatively small product is dropped between the support parts onto a conveyor and the like laterally provided under the movable table and carried thereby, while the comparatively large product remains laid on the work support parts and taken out by a worker after completion of the processing. Another laser beam machining device has been described in FR-A-2,492,703, which comprises a working head having a laser beam irradiation part laterally movably mounted on an upper frame, a table provided opposite the working head for supporting a work-piece during machining, feed means provided on the upper surface of the table, and a work-piece supporting plate having a base of linear mesh material on which the work-piece is supported on the feed means during machining. The conventional technology mentioned above requires the use of cranes to carry in the work-piece and the provision of a worker for every laser beam machine or every several machines to take out the processed comparatively large product supported by the work-piece support part labour saving could not be achieved. Particularly, the operation of the laser beam machining device for 24 hours is attended with midnight works, and the more labour saving has been desired. Summary of the Invention It is, accordingly, an object of the present invention to provide a laser beam machining device, whereby the conventional problems are solved and the labour saving can be achieved. The device according to the present invention comprises a working head having a laser beam irradiation part laterally movably mounted on an upper frame, a table provided opposite the working head for supporting a work-piece during machining, feed means provided on the upper surface of the table, a work-piece supporting plate having a base of linear mesh material on which the work-piece is supported on the feed means during machining, characterised in that it includes: a clamping device provided at least at one end of the table and capable of fixing the work-piece supporting plate in its machining position on the feed means; in that the feed means is a roller feed means for feeding the work-piece and its supporting plate to its machining position on the table and has a plurality of driving rollers spacedly arranged parallel to each other on the table for passage of the the laser's beam through spaces between the rollers, and in that the table is longitudinally movable with respect to the lateral movability of the irradiation part or the table is fixed and the irradiation part is additionally longitudinally movable. Preferably each roller comprises a small diameter roller and larger diameter disks fixed to the small roller for supporting the work-piece supporting plate. Preferably the work-piece supporting plate has stops for engaging around the work-piece at the edges of the mesh linear material base and the stops comprise a frame plate fixed to the outside of the mesh linear material. According to the above constitution, the work-piece can be set on the supporting plate in a state held by the stops and carried onto and out from the table together with the supporting plate by the driving rollers. Brief Description of the Drawings Figures 1-5 show a first embodiment of the present invention in which Figure 1 is a front view of the same; Figure 2 is a sectional view of the essence thereof; Figure 3 is a perspective view of the whole device; Figure 4 is a perspective view of the essence thereof; Figure 5 is a plane view illustrating the arrangement state; Figure 6 is a front view illustrating a second embodiment of this invention; Figure 7 is a perspective view of the essence of the same; Figure 8 is a perspective view of the third embodiment of the present invention; Figure 9 is a sectional view of the essence of the same; and Figure 10 is a side view of a driving roller of the third embodiment. Description of Preferred Embodiments The preferred embodiments of the present invention are further illustrated in reference to the attached drawings. In Figs. 1-5 showing the first embodiment of the invention, a working head 2 having a well-known laser beam irradiation part 1 is provided laterally and longitudinally movably on a gate frame 3 as an upper frame, which frame 3 has a base 4 in its lower part, and a movable table 5 is longitudinally movably provided on the base 4 in opposition to the working head 2. The movable table 5 has on its either side a cramp device 8 for fixing a setting plate 7 for setting an iron plate 6 or a work by means of an air cylinder (not shown), etc. The cramp device 8 can fix a frame plate described later by closing a vertical pair of support bodies 8A, 8B by the air cylinder. On the upper surface of the movable table 5, driving rollers 9 such as iron rollers are provided in parallel to each other, with the shaft cores of the driving rollers 9 crossing the moving direction of the movable table 5 at a right angle, and also the driving rollers 9 can be rotated positively and reversely by a motor 10 provided on one side of the movable table 5. Namely, a first driving sprocket 11 is fixed to the motor shaft of the motor 10 provided on the moving table 5 through a decelerator (not shown), and a plurality of first driven sprockets 12 are disposed in a row under the driving rollers 9, with a first chain 13 being suspended between these first driving sprockets 11 and the first driven sprocket 12, and also second driven sprockets 14 are fixed to the shaft end of each driving roller 9, with second chains 15 being suspended between the second driven sprockets 14 and second driving sprockets (not shown) provided concentrically with the first driven sprockets 12, so that the driving rollers 9 can be rotated positively and reversely by the rotating force of the motor 10. The setting plate 7 has a plate form made by netting wavy linear materials of iron as a mesh linear material, and a number of holes 17 are formed thereon. A frame plate 18 such as iron plate which is a stopper engagingly locking and enclosing the iron plate 6 is fixed to the upper surface edge part of the setting plate 7. A known stocker 20 having the setting plates 7 loaded with the iron plates 6 in multiple stages is provided on the other side of the laser beam machining device 19 in such a manner as to be capable of going up and down by means of a hydraulic cylinder (not shown), and also the stocker 20 has a feed device (not shown) for feeding the received setting plates 7 one by one to the driving roller 9 side. On the other side of the stocker 20, a known cubic store house 21 is provided to receive a plurality of stockers 20, which can be carried in and out to a determined position by an automatic dolly 22. Denoted at 23 is a control board, 24 is a known carrying device such as conveyor provided on the base 4, in which each stepped part 24A, 24B, 24C is extended and contracted to move a product (not shown) on the respective upper surface from the upper step part 24C to the lower step part 24A side and finally fall down the product from the part 24A. The description is now directed to the action of the above-said constitution. The iron plate 6 is set on the setting plate 7 with being preliminarily locked by the inner edges of the frame plate 18 and stored in multiple stages in the stocker 20, which stocker 20 is received in the cubic store house 21. After the stocker 20 pulled out by the automatic dolly 22 is moved to the side of the laser beam machining device 19, the iron plate 6 is pulled out from the stocker 20 onto the movable table 5 together with the setting plate 7, and also the driving rollers 9 are driven and rotated in the arrowed direction A by the motor 10, whereby the setting plate 7 is carried in the direction of the cramp device 8 to bring the frame plate 18 into contact with the cramp device 8, by which the frame plate 18 is fixed and positioned. Thereafter, with laterally moving the working head 2 by a known driving device (not shown) and longitudinally moving the movable table 5 by the similar known driving device (not shown), based on the data preliminarily inputted by the control board 23, the iron plate 6 is irradiated with laser beams from the irradiation part 1 facing the iron plate 6, whereby cutting work is carried out. A cut out product 25 larger than the hole 17 is supported on the setting plate 7, while a product 26 smaller than the hole 17 is passed between the hole 17 and the driving rollers 9 and fallen onto the carrying device 24 to recover the product 26 as described above. Thus, after completion of the machining with laser beams, the cramp device 8 is opened to release the fixed state, and the driving rollers 9 are reversely rotated by the motor 10 to carry the setting plate 7 into the stocker 20 together with the product 25 and the residual iron plate 6, whereby one stroke is finished. Thereafter, the stocker 20 is raised and lowered to feed out the placing plate 7 in another stage together with the iron plate 6 onto the driving rollers 9 to conduct the machining. Thus, after all the iron plates 6 received in the stocker 20 are machined, the stocker 20 is stored in the store house 21 by the automatic dolly 22, and a new stocker 20 is carried out to repeat the machining. In the above embodiment, the provision of the driving rollers 9 on the upper surface of the movable table 5 enables the automatic carrying in of the iron plate 6 and its carrying out together with the product 25 by the driving rollers 9, contributing to the labor saving. As the iron plate 6 is worked in the state set on the setting plate 7 having a plurality of holes 17 formed thereon, there is no possibility of inclination of the products 25, 26 during cutting, and the cutting work can be carried out with highly dimensional accuracy. The frame plate 18 capable of engagingly locking the edge part of the iron plate 6 is provided on the edge part of the setting plate 7, whereby the iron plate 6 can be positioned and fixed by this frame plate 18, disposed in a determined position of the movable table 5, and prevented from slipping down during the movement, providing the certain carrying in and out and machining. Further, the setting plate 7 can be reinforced by the frame plate 18. In Figs. 6 and 7 showing a second embodiment of the present invention, like reference characters denote like parts as in the first embodiment to omit the detailed description. In the second embodiment, a rotating shaft 27 is connected to the motor shaft of the motor 10 self-containing a decelerating device (not shown) fixed to either side of the movable table 5, and the first driven sprocket 12 concentric with the rotating shaft 27 is driven through, for example, a worm such as worm wheel 28 to transmit the rotating force of the motor 10 to the driving rollers 9. The setting plate 7 has the frame plates 18 on the both sides and protruded stoppers 29 in the longitudinal direction, and also the cramp device 8 is provided in the longitudinal direction of the movable table 5. Thus, the iron plate 6 can be engagingly locked by the frame plates 18 and the stoppers 29 into the holding state and fixed by the cramp device 8. In Figs. 8-10 showing a third embodiment of the present invention, like reference characters denote like parts as in the first embodiment to omit the detailed description. In the third embodiment, each of the driving rollers 9 is formed of a small iron roller 9A and disks 9B, the respective small rollers 9A are provided in parallel to each other, and the disks 9B are fixed to the small roller 9A in parallel to each other. The small iron rollers 9A with disks are driven, whereby a setting plate 7 on the disks is carried in the direction of the cramp device 8 to bring the frame plate 18 into contact with the cramp device 8. The iron plate 6 is irradiated with laser beams from the irradiation part 1 facing the iron plate 6, and the laser beams by the laser beam irradiation part 1 go through not only the iron plate 6 but also the gap of the disks. As the driving roller 9 is formed of the small iron roller 9A and disks, the iron plate 6 or work is irradiated with and cut by laser beams efficiently. This invention is never limited by these embodiments as described above, and the parallel arrangement of free rollers freely rotatable together with the driving rollers, or the respective connection of motors to driving rollers may be adapted, although the driving rollers are provided on the movable table in the embodiments. Further, various modifications such as a fixed table with a longitudinally movable gate frame can be carried out, instead of the movable type table shown in the embodiments. The device of the prevent invention has a working head having a laser beam irradiation part provided on an upper frame, a table provided horizontally in opposition to the working head, driving rollers provided in parallel to each other on the upper surface of the table, a work supporting setting plate having a plurality of holes formed thereon which is provided on the driving rollers in such a manner as to be capable of setting thereon, and a stopper capable of engagingly locking the edge part of the work provided on the edge part of the setting plate, and by providing the driving rollers on the movable table, the setting plate having holes formed thereon can be carried onto the table in the state where the work is set on the setting plate and positioned by the stopper, and carried out together with the resulting product. Thus, the carrying in of the work and the carrying out of the product can be automized to save the labor, and further precise machining can be conducted as the work is machined in the state set on the setting plate.

Claims: A laser beam machining device comprising: a working head (2) having a laser beam irradiation part (1) laterally movably mounted on an upper frame (3), a table (5) provided opposite the working head (2) for supporting a work-piece during machining, feed means (9) provided on the upper surface of the table (5), a work-piece supporting plate (7) having a base (16) of linear mesh material on which the work-piece is supported on the feed means during machining, characterised in that it includes: a clamping device (8) provided at least at one end of the table (5) and capable of fixing the work-piece supporting plate (7) in its machining position on the feed means (9); in that the feed means (9) is a roller feed means for feeding the work-piece (6) and its supporting plate (7) to its machining position on the table (5) and has a plurality of driving rollers (9) spacedly arranged parallel to each other on the table (5) for passage of the the laser's beam through spaces between the rollers (9), and in that the table (5) is longitudinally movable with respect to the lateral movability of the irradiation part (1) or the table (5) is fixed and the irradiation part (1) is additionally longitudinally movable. A laser beam machining device as claimed in claim 1, characterised in that each roller comprises a small diameter roller (9A) and larger diameter disks (9B) fixed to the small roller for supporting the work-piece supporting plate (7). A laser beam machining device as claimed in claim 1 or claim 2, characterised in that at least some of the rollers (9) are driven by a motor (10) carried on the table (5). A laser beam machining device as claimed in any preceding claim, characterised in that each clamping device (8) comprises a pair of vertically actuable clamping members (8A,8B) and an actuator. A laser beam machining device as claimed in any preceding claim, characterised in that the work-piece supporting plate (7) has stops (18) for engaging around the work-piece at the edges of the mesh linear material base (16). A laser beam machining device as claimed in claim 5, characterised in that the stops comprise a frame plate (18) fixed to the outside of the mesh linear material (16). A laser beam machining device as claimed in claim 6, characterised in that the clamping device (8) acts on the frame plate (18). A laser beam machining device as claimed in any preceding claim, characterised in that it is provided in combination with a multi-stage stocker (20) for a plurality of work-piece supporting plates and a feed device for sequentially feeding the plates to the table for work-piece machining and returning the plates to the stocker after machining of the work-pieces.

Inventors: SEKI MASAHIRO, SEKI, MASAHIRO
Applicants: SEKI MASAHIRO, SEKI, MASAHIRO
Application year: 1990
Main classification: B23K26
IPC codes: B23K26