"Note that FIG. 25 to FIG. 27 show an example of a cover structure of a machine tool in which a slide door 14 is provided outside the machine tool. FIG. 25 shows a state where the slide door is opened, and FIG. 26 shows a state where the slide door is closed. Further, FIG. 27 is a view explaining a cross section of the cover structure of FIG. 26. The cover structure shown in FIG. 25 to FIG. 27 is similar to the structure described above with reference to FIG. 22 to FIG. 24, and hence the description thereof is omitted.
"In some use cases, the slide door of the machine tool may be opened and closed as frequently as 1000 times or more per day and may also be opened and closed much quickly in order to increase production efficiency. Therefore, in the cover structure described in Japanese Utility Model Laid-Open No. 5-340, the wear of the sliding contact member is large, and the slide door cannot be opened and closed quickly.
"Further, in the cover structure of the machine tool, which is described with reference to FIG. 22 to FIG. 27, each of shock absorbing members 6 and 16, such as cushion rubber and cushion sponge, is attached to the closing-direction-side end surface of each of the slide doors 4 and 14, in order to absorb a shock due to a collision between the closing-direction-side end surface of each of the slide doors 4 and 14, and the slide-door-closing-side end surface of the opening portion of each of the fixed covers 2 and 12. In this cover structure of the machine tool, wearing and falling off of each of the shock absorbing members 6 and 16, such as cushion rubber and cushion sponge, are caused due to the shock at the time of closing the slide door, and due to the influence of chips, coolant, and the like. As a result, when the slide door is closed, the shock due to the collision between the slide door and the fixed cover is increased, and thereby electronic devices, such as a numerical controller and an operation panel, provided on the fixed cover, may be damaged."
In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventors' summary information for this patent application: "Therefore, in view of the above described problems of the prior art, it is an object of the present invention to provide a cover structure of a machine tool, which can reduce the possibility of breakage of electronic devices provided on a fixed cover.
"A cover structure of a machine tool according to the present invention includes a fixed cover for isolating an inside portion of the machine tool from the outside, the inside portion serving as a machining space, and one or more one-side opening type slide doors for opening and closing an opening portion formed in the fixed cover. Further, the cover structure of the machine tool includes a stop structure portion for, when the slide door is moved in the closing direction, stopping the slide door at a predetermined distance away from the end surface of the opening portion of the fixed cover, the stop structure portion being provided on a portion of the slide door other than the closing-direction-side end surface of the slide door, or provided on a portion of the fixed cover other than the slide-door-closing-side end surface of the opening portion of the fixed cover.
"Further, the stop structure portion can be provided at a position of the end portion of the opening portion of the fixed cover, the end portion crossing the opening and closing direction of the slide door, or can be provided at a position above or below the opening portion.
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