Protection device of a laser processing unit

This application claims priority under 35 U.S.C. §119 to European Patent Application Ser. No. 04 02 1785.1, filed on Sep. 14, 2004, the entire contents of which is hereby incorporated by reference.

The disclosure relates to a protection device of a laser processing unit.

In laser processing units, rigid, displaceable doors have been used as protection devices and/or for dividing independent working areas. The doors are disposed to be displaceable to permit transfer of an extension arm and/or laser processing head into different working areas. One working area can be designed for preparations, and another working area can be designed for simultaneous laser processing.

In various aspects, a protection device for a laser processing unit is provided with a simple construction that permits transfer of an extension arm and/or laser processing head between working areas. For example, a protection device of a laser processing unit can have a dividing wall that can be moved in a vertical direction and that consists of individual interconnected sections.

In one implementation, a basic frame is provided that includes a U-shaped guidance for the dividing wall, where the dividing wall can be moved through the basic frame transversely to the longitudinal direction of the basic frame and can be moved out of the basic frame on both longitudinal sides of the basic frame. If, in a central position of the dividing wall, one half of the dividing wall can be moved out of the basic frame on each of the frame's sides, the extension arm and/or the laser processing head can cross the dividing wall.

In an implementation in which the basic frame includes rollers, the dividing wall can be displaced and positioned in the laser processing unit. A drive unit can be provided to move the dividing wall.

The details of one or more implementations are set forth in the accompanying drawings and the description below. Other features will be apparent from the description and drawings, and from the claims.

FIG. 1 is a top view of a laser processing unit.

FIGS. 2 a , 2 b , and 2 c are side views of a protection device of the laser processing unit shown in FIG. 1 .

FIG. 3 is an enlarged sectional view of a dividing wall of the protection device.

Like reference symbols in the various drawings indicate like elements.

As shown in FIG. 1 a laser processing unit 1 for operation with 2 stations includes outer walls 2 and sliding doors 3 and 4 . The laser processing unit 1 is suited for laser processing, such as, for example, laser cutting, laser welding, and hardening. A machine frame 5 supports an extension arm 6 that is provided with a laser processing head (not shown in FIG. 1 ). By means of the extension arm 6 , the laser processing head can be positioned in X, Y, and Z directions above first and second work tables 7 and 8 . The independent working areas 9 and 10 that are available for the motion of the laser processing head and that result from the space required for the extension arm 6 and the laser processing head are drawn in hatched lines in FIG. 1 .

During operation of the laser processing unit 1 , a user 11 can take preparational measures on a work table 7 or 8 , can exit the workplace via the sliding door 3 or 4 and can start and perform laser processing from outside the workplace via an operating means 12 while being protected by the closed sliding door 3 or 4 . The laser processing unit 1 may also be automated.

If a workpiece on a work table 7 or 8 is to be processed, the laser processing head must be transferred from a working area 9 or 10 into the other working area 10 or 9 . However, the user 11 can carry out preparations in one working area 9 or 10 only if the working area 9 or 10 is protected from laser radiation. Towards this end, a protection device is provided, which includes a movable dividing wall 13 that includes individual sections (as shown in FIG. 3 ) of the type of a circulating roller blind. The ends 14 and 15 of the dividing wall 13 can be guided in guiding rails. In this manner, laser processing can be performed in one working area while the other working area can be used for preparations.

FIGS. 2 a , 2 b , and 2 c show, in sequence, different possible motions of the dividing wall 13 . In a first position, as shown in FIG. 2 a , the dividing wall 13 is completely extended on the side facing the working area 10 . The working area 10 is shielded and the user could work there. On the side facing the working area 9 , the dividing wall 13 is countersunk into a basic frame 16 with basic frame walls 16 a and 16 b , such that part 17 of the working area is provided for the motion of the extension arm or the laser processing head 18 .

In a second position, as shown in FIG. 2 b , the dividing wall 13 is partially extended both on the side facing the working area 9 and on the side facing the working area 10 , i.e. by half the length of the wall 13 . This permits crossing of the dividing wall 13 by the laser processing head 18 . The dividing wall 13 projects past both sides of the basic frame 16 .

In a third position, as shown in FIG. 2 c , the dividing wall 13 is completely extended on the side facing the working area 9 . The working area 9 is shielded and the user could work there. On the side facing the working area 10 , the dividing wall 13 is countersunk into the basic frame 16 of the dividing wall 13 such that part 17 of the working area is provided to move the extension arm or the laser processing head 18 . The part 17 of the working area is alternately part of the working area 9 or 10 for which it can then be used.

The basic frame 16 has rollers 16 c and can be pushed into the working area of the laser processing unit, thereby dividing the working area into two independent working areas. The basic frame 16 and dividing wall 13 can also be removed, if required, to permit use of the entire working area for laser processing of larger workpieces.

As shown in FIG. 3 , the dividing wall 13 includes individual articulated sections 19 . Connecting pieces of the sections 19 are not shown but are designed such that the sections 19 can be pushed together, similar to blinds, sliding doors, or rolling gates. Teeth 20 of a driving wheel 21 of a drive unit accommodated in the basic frame can engage in gaps of the sections 19 with a geared motor or electromotor and thereby move the dividing wall 13 in along the direction of the double arrow 23 to move the dividing wall up or down in the guiding rail 22 .

A number of implementations have been described. Nevertheless, it will be understood that various modifications may be made. Accordingly, other embodiments are within the scope of the following claims.