JP5353354B2 - Door opening / closing mechanism, operation box having the door opening / closing mechanism, and machine tool having the operation box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door opening/closing mechanism which can reduce a space for providing a door opening/closing hinge, an operation box having the door opening/closing mechanism, and a machine tool having the operation box. <P>SOLUTION: In the machine tool, a hinge mechanism 30 for opening and closing an operation panel 21 is provided in an operation box. A door-side hinge 50 for connecting a spindle 42 to the operation panel 21 is constituted in a rectangular frame form to reduce a lateral width dimension, whereby the dimension in the widthwise direction between an outer edge in a liquid crystal screen 27 and an outer edge in the operation panel 21 can be reduced. The door-side hinge 50 includes two components of a member 60 to be supported and a door-side fixing member 70. The door-side fixing member 70 is moved relative to the member 60 to increase a distance between the spindle 42 and the operation panel 21. The trajectory of rotation of the operation panel 21 can be secured. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention includes a door opening / closing mechanism that opens and closes an opening provided on a front surface of a box with a door that is rotatably supported by a hinge, an operation box including the door opening / closing mechanism, and the operation box. It relates to machine tools.

  2. Description of the Related Art Conventionally, a machine tool includes a machine body that cuts a workpiece, and an iron base that serves as a base for the machine body. On the base, a box-shaped cover surrounding the machine body is provided. An operation box having an operation panel for operating the machine tool on the front is provided on the front of the cover. The operation panel is pivotally supported by an opening provided on the front surface of the operation box so as to be opened and closed. The operation panel is provided with a liquid crystal screen for displaying a setting screen for setting the operation of the machine tool. For example, there is a machine tool in which an operation panel is rotatably attached to a panel attachment portion of a cover that covers a machine tool body via a hinge mechanism (see, for example, Patent Document 1).

JP 2005-230951 A

  However, while the space saving of the machine tool is demanded, the workability is lowered if the liquid crystal screen of the operation panel is made small like the machine body. In the machine tool disclosed in Patent Document 1, it is difficult to secure a space for providing a hinge mechanism for opening and closing the operation panel when the operation panel is made small and the liquid crystal screen is maintained at the current size. there were.

  The present invention has been made to solve the above-described problems, and is provided with a door opening / closing mechanism capable of reducing a space for providing a hinge for opening / closing the door, an operation box including the door opening / closing mechanism, and the operation box. It aims at providing the machine tool provided with.

In order to achieve the above object, a door opening / closing mechanism according to claim 1 has an opening provided on the front surface of a box body rotatably supported on a hinge shaft by a hinge provided in the vicinity of the opening. In the door opening / closing mechanism that opens and closes with the door, the hinge is provided at the end of the door on the side where the door is supported and in the vicinity of the opening, and the door hinge is rotated about the shaft. is composed of a box body side hinge for rotatably supported side, the door-side hinge is supported by the shaft of the box body side hinge, in a state in which the opening is closed by the door, which is supported by the shaft The other end side opposite to the one end side is a plate-like supported portion that extends toward the front of the opening, the plate-like door-side fixing portion whose one end side is fixed to the door side, and the door the one end side of the side fixing portion and the extending direction of the other end side opposite to the other end side with respect to the other end of the supported portion It is composed of a connecting mechanism movably connected to each other in a row.

Also, closing mechanism of the door according to claim 2, in addition to the configuration of the invention according to claim 1, wherein the connecting mechanism, the other end of the other side or the door side fixing portion of the supported portion A long hole extending in the extending direction; a bolt that is loosely engaged with the long hole; and the other end side of the door-side fixing portion that is not provided with the long hole or the cover. It is provided with the said other end side of a support part, and is comprised from the insertion hole in which the said volt | bolt engaged with the said long hole is inserted, and the nut fastened by the said volt | bolt inserted in the said insertion hole .

According to a third aspect of the present invention, in the door opening / closing mechanism, in addition to the structure of the second aspect of the invention, the bolt includes a cylindrical screw forming portion and a cylindrical sliding member having a diameter larger than that of the screw forming portion. The moving portion and the operation portion are provided on the same axis, and the length of the sliding portion in the axial direction is the supported portion in which the elongated hole is formed, or the door side fixing portion in which the elongated hole is formed. than the thickness and wherein the long Ikoto.

An operation box according to claim 4 is an operation box provided with an operation panel for operating a machine, and is provided in an opening on a front surface of the operation box, and supports the operation panel and is openable and closable. and it has been the door, and a closing mechanism of the door according to any one of claims 1 to 3.

  A machine tool according to a fifth aspect is a machine tool for machining a workpiece, and includes the operation box according to the fourth aspect.

In the door opening and closing mechanism according to the first aspect, the door-side hinge includes a supported portion supported by the shaft of the box-side hinge and a door-side fixing portion fixed to the door side . In the supported portion, the other end side opposite to the one end side on the side supported by the shaft extends toward the front of the opening in a state where the opening is closed by the door. And the other end side of the door side fixing | fixed part is connected with the other end side of the to-be-supported part so that it can move in parallel with the extension direction of the other end side by the connection mechanism. Thus, when opening the door, it is possible by Rukoto moving the door side fixing portion in front of the opening with respect to the supported portion, to separate the door from the shaft center. That is, in the closed state of the door, it is possible to reduce the distance between the door and the shaft, it is possible to narrow the space for providing the hinge. The size of the box and the door can be reduced.

Further, in the door opening / closing mechanism according to claim 2, in addition to the effect of the invention according to claim 1, the coupling mechanism is loosely fitted in an elongated hole having a length in the extending direction on the other end side of the supported portion. The bolt is engaged. Accordingly, the door-side fixing portion can be moved in parallel with the extending direction on the other end side with respect to the other end side of the supported portion without detaching the door-side fixing portion from the supported portion.

Further, the opening and closing mechanism of the door according to claim 3, in addition to the effect of the invention according to claim 2, the axial length of the sliding portion, the supported portion of elongated hole is formed, or long holes It has long than the thickness of the formed door side fixing unit. Thereby, in the state which inserted the volt | bolt in the long hole, the operation part engages with the peripheral part of a long hole, and a sliding part is located inside a long hole. Since the sliding part moves along the inside of the long hole, the door side fixing part can be gently moved with respect to the supported part.

  In addition, since the operation box according to claim 4 includes the door opening and closing mechanism according to any one of claims 1 to 3, a space for providing a hinge for opening and closing the door that supports the operation panel can be narrowed. . Therefore, the size of the operation box can be reduced.

  Further, the machine tool according to the fifth aspect includes the operation box according to the fourth aspect, so that space saving of the machine tool can be achieved.

1 is a perspective view of a machine tool 1 (a state in which an opening 10 is closed). 1 is a perspective view of a machine tool 1 (a state in which an opening 10 is opened). 3 is a front view of an operation box 20. FIG. FIG. 3 is a perspective view (bottom wall is omitted) viewed from the back side of the operation box 20. It is the elements on larger scale of the hinge mechanism 30 shown in FIG. It is AA arrow direction sectional drawing shown in FIG. FIG. 6 is a perspective view showing a state in which the door-side fixing member 70 is pulled out from the supported member 60 and slid from the state of the hinge mechanism 30 shown in FIG. 5. It is a top view which shows the state which pulled out the door side fixing member 70 from the to-be-supported member 60, and slid from the state of the hinge mechanism 30 shown in FIG. FIG. 3 is a plan view showing a state in which an operation panel 21 is rotated around a support shaft 42.

  Hereinafter, a machine tool 1 according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the X-axis direction of the machine tool 1 refers to the left-right direction of the machine tool 1 (in FIG. 1, the direction with the right door 11 and the left door 12 described later is the front of the machine tool 1), and the Y-axis direction. The term “machine tool 1” refers to the depth direction (front-rear direction), and the “Z-axis direction” refers to the machine tool 1 vertical direction.

  The configuration of the machine tool 1 will be described with reference to FIGS. The machine tool 1 moves a workpiece (not shown) and a tool (not shown) relative to each other to perform desired machining (for example, “milling”, “drilling”, “cutting”, etc.) on the workpiece. Apply. The machine tool 1 includes an iron base 2 serving as a base and a machine body provided on the upper portion of the base 2. A box-type splash cover 3 is provided on the base 2 to surround and protect the machine body. A control device 9 for controlling the operation of the machine tool 1 is provided on the back side of the splash cover 3.

  The base 2 will be described. As shown in FIGS. 1 and 2, the base 2 has a shape extending in the Y-axis direction. At the four corners at the bottom of the base 2, legs that can be adjusted in height are provided.

  The splash cover 3 will be described. The splash cover 3 has a box shape. A substantially rectangular opening 10 is provided in the approximate center of the front panel 5 of the splash cover 3. The opening 10 is provided with a right door 11 and a left door 12 that slide in the left-right direction. The right door 11 and the left door 12 move along guide rails (not shown) provided on the inner surface of the front panel 5 along the vicinity of the upper inner edge and the vicinity of the lower inner edge of the opening 10. .

  The right door 11 closes the right half of the opening 10 (the right half when the front panel 5 is viewed from the front). The left door 12 closes the left half of the opening 10 (the left half when the front panel 5 is viewed from the front). When the front panel 5 is viewed from the front, the right door 11 is located on the back side, and the left door 12 is located on the near side (operator side). The right door 11 and the left door 12 have windows 11A and 12A through which the machine body can be viewed from the outside of the machine tool 1 at the center. The windows 11A and 12A are formed of a transparent reinforced resin material that can withstand contact with cutting fluid and chips.

  A handle 11 </ b> B is provided at the lower right side of the front surface of the right door 11. When the right door 11 is moved to the left side by the handle 11B with the opening 10 closed (see FIG. 1), the left door 12 also moves to the left following the movement as shown in FIG. Part 10 opens. An operator attaches / detaches a workpiece to / from a table 8 (described later) installed on the base 2 through the opened opening 10.

  An operation box 20 for operating the machine tool 1 is fitted on the right side of the opening 10 in the front panel 5. As shown in FIG. 3, an operation panel 21 for setting a machining program of the machine tool 1 and parameters is provided on the front surface of the operation box 20. A circuit board 28 (see FIG. 4) provided on the back surface of the operation panel 21 is connected to the control device 9 via wiring (not shown).

As shown in FIGS. 1 and 2, the right side wall of the splash cover 3 is provided with a rectangular opening 14 for performing maintenance of the machine body. A plate-shaped inspection hatch 17 is detachably attached to the opening 14. A magazine motor 18 of the tool changer 6, a cable bear (registered trademark) 19, which will be described later, and the like protrude from an upper portion of the splash cover 3 that opens.

  The machine body will be described. As shown in FIG. 2, the machine body includes a columnar column (not shown) fixed to the rear of the upper surface of the base 2, a spindle head (not shown) provided so as to be movable up and down along the front side of the column, A spindle (not shown) provided below the spindle head and a tool changer 6 (ATC) supported on the front side of the spindle head are provided. The tool changer 6 grips a plurality of tools and automatically changes a tool attached to the spindle. A table 8 that is movable in the XY-axis direction is provided on the upper portion of the base 2. A cable bear 19 for performing wiring processing of the spindle head is provided in the vicinity of the upper portion of the spindle head.

  The structure of the operation box 20 will be described with reference to FIGS. The operation box 20 is a substantially rectangular parallelepiped metal (for example, iron) box. The operation box 20 includes a box body 22 having an open front surface and an operation panel 21 provided on the front surface of the box body 22. Since the operation panel 21 is pivotally supported in the vicinity of the left end portion of the opening end of the box body 22, the operation panel 21 can be opened and closed. Normally, the vicinity of the outer peripheral edge of the operation panel 21 is fixed by a plurality of fixing screws 26. A preliminary opening (not shown) is provided below the operation panel 21. A spare switch panel 23 is provided in the spare opening, and is fixed with a fixing screw 26.

  The operation panel 21 will be described with reference to FIG. The operation panel 21 is a vertically long rectangular plate. The upper half of the surface of the operation panel 21 is provided with a liquid crystal screen 27 having a rectangular shape in front view for displaying a setting screen, an operation status, and the like of the machine tool 1. Below the liquid crystal screen 27, an operation unit 29 provided with various switches and buttons such as an activation switch for starting the machine tool 1 and an operation switch for instructing a tool change operation by the tool changer 6 is provided.

  A signal is output from the circuit board 28 (see FIG. 4) provided on the back side of the operation panel 21 to the control device 9 (see FIG. 1) via wiring by turning on and off each switch in the operation unit 29. The control device 9 outputs a control signal to each device constituting the machine tool 1. The machine tool 1 performs a machining operation according to a control signal output from the control device 9 based on an input from the operation panel 21. The operation panel 21 corresponds to “door” and “operation panel” of the present invention.

  As shown in FIG. 3, in the operation panel 21, when the operation panel 21 is viewed from the front, the left end portion on the side to be pivotally supported by the box body 22 is the shaft support side end portion 15, and the right end portion is the opening / closing side end portion. 16 As shown in FIG. 4, a hinge mechanism 30 is provided in the upper part of the operation panel 21 in the vicinity of the shaft support side end 15 on the back side. The hinge mechanism 30 pivotally supports the operation panel 21 with respect to the box body 22 so as to be opened and closed.

  The structure of the hinge mechanism 30 will be described with reference to FIGS. The hinge mechanism 30 includes a box-side hinge 40 (see FIG. 6) fixed to the box body 22 side and a door-side hinge 50 having a rectangular frame shape in plan view fixed to the operation panel 21 side. The box-side hinge 40 pivotally supports the door-side hinge 50 so as to be rotatable.

  The structure of the box side hinge 40 will be described with reference to FIG. As shown in FIG. 6, the box-side hinge 40 includes a plate-like fixing plate 41 fixed to the front portion of the inner surface of the left side wall of the box body 22 and a rod-like support shaft 42 provided on the fixing plate 41. Become. The support shaft 42 is positioned parallel to the vertical direction of the box body 22 and with a predetermined gap from the inner surface of the left side wall of the box body 22.

  The structure of the door side hinge 50 is demonstrated with reference to FIG. 5, FIG. The door-side hinge 50 is pivotally supported by the support shaft 42 of the box-side hinge 40 and is fixed to the support member 60 having a substantially U shape in plan view and the support-side end 15 side of the back surface of the operation panel 21. A door-side fixing member 70 that is L-shaped in view, and a bolt 81 and a nut 87 that connect the supported member 60 and the door-side fixing member 70 in the horizontal direction are provided.

  The structure of the supported member 60 will be described with reference to FIGS. The supported member 60 is a plan view in which a plate-like supported member 61 to be supported by the support shaft 42 and a plate-like connecting member 64 to be connected to the door-side fixing member 70 are welded and fixed integrally. It is a U-shaped plate material.

  The supported member 61 is a plate material having a longitudinal length in the front-rear direction of the box body 22. A cylindrical tube portion 62 that is inserted on the support shaft 42 is provided at the front end portion of the shaft support member 61. A fixed portion 63 is provided at the rear end portion of the pivoted support member 61 so as to be folded at a substantially right angle toward the right side of the box body 22.

  The connecting member 64 is a plate member whose center is bent into an approximately L shape in plan view. The connecting member 64 is a plate-like fixing portion 65 that is integrally fixed by welding to the fixing portion 63 of the pivot support member 61, and is folded forward at a substantially right angle from one end portion of the fixing portion 65 directed to the right side. And a plate-like connecting portion 66 extending in the direction. As shown in FIG. 5, the connecting portion 66 is provided with a pair of long holes 68, 68 formed in order to insert the bolts 81 in the vertical direction of the box body 22. The long holes 68, 68 have a shape that is long in the direction orthogonal to the longitudinal direction of the support shaft 42 and in the front-rear direction of the box body 22.

  The structure of the door side fixing member 70 is demonstrated with reference to FIG. 5, FIG. The door-side fixing member 70 extends in the front-rear direction of the box body 22. A fixing portion 71 is provided at the front end portion of the door-side fixing member 70 so as to be folded substantially at a right angle on the left side. The door-side fixing member 70 can be fixed to the operation panel 21 by fixing the fixing portion 71 of the door-side fixing member 70 to the upper portion of the back surface of the operation panel 21 on the shaft support side end 15 side. On the rear end side of the door side fixing member 70, a pair formed to insert bolts 81 at positions corresponding to the pair of long holes 68, 68 (see FIG. 5) provided in the connecting portion 66 of the connecting member 64. Circular insertion holes 72, 72 are provided.

  The shape of the bolt 81 will be described with reference to FIGS. The bolt 81 is formed in a cylindrical shape and has a screw forming portion 84 having a thread on the outer peripheral surface, a cylindrical sliding portion 83 having a larger diameter than the screw forming portion 84, and a hexagon formed in a hexagonal column. The part 82 is coaxially connected. The nut 87 has a hexagonal shape and is a well-known general part. The length of the sliding portion 83 in the axial direction is adjusted to be longer than the plate thickness of the connecting portion 66 of the connecting member 64 having the long holes 68 and 68. The hexagonal part 82 corresponds to the “operation part” of the present invention.

  A method of connecting the door-side fixing member 70 to the supported member 60 will be described with reference to FIGS. The rear end side of the door-side fixing member 70 is overlapped and brought into close contact with the connecting portion 66 of the supported member 60 pivotally supported by the box-side hinge 40. The positions of the insertion holes 72 and 72 provided on the rear end side of the door-side fixing member 70 are aligned with the positions of the pair of long holes 68 and 68 provided in the connecting portion 66 of the supported member 60.

  Bolts 81 are inserted into the long holes 68 and 68 and the insertion holes 72 and 72, respectively. The hexagonal portion 82 of the bolt 81 is locked to the surface of the connecting portion 66. Inside the door side hinge 50, the nut 87 is each fastened with respect to the screw formation part 84 which protruded from the pair of insertion hole 72 of the door side fixing member 70. As shown in FIG. In this way, the door side fixing member 70 can be connected to the supported member 60.

  A procedure for fixing the operation panel 21 to the box body 22 will be described with reference to FIGS. When fixing the operation panel 21 to the box body 22, the nut 87 fastened to the bolt 81 is loosened. At the connecting portion between the supported member 60 and the door-side fixing member 70, the bolt side 81 in the elongated hole 68 is located on the door side with respect to the supported member 60 so that the position of the bolt 81 is located behind (inner side) the box body 22. The fixing member 70 is slid rearward (see FIG. 5).

  As described above, the axial length of the sliding portion 83 of the bolt 81 is longer than the plate thickness of the connecting portion 66 of the connecting member 64. Therefore, in a state where the door-side fixing member 70 is connected to the supported member 60, the sliding portion 83 of the bolt 81 is positioned inside the elongated hole 68 provided in the connecting portion 66. The diameter of the sliding portion 83 is shorter than the vertical width of the long hole 68. The sliding portion 83 of the bolt 81 is loosely fitted to the inside of the long hole 68. Accordingly, in a state where the nut 87 fastened to the bolt 81 is loosened, the smooth peripheral surface of the sliding portion 83 slides along the inner peripheral surface of the elongated hole 68, so that the door side is fixed to the supported member 60. The member 70 can be slid smoothly. Since the sliding portion 83 has a larger diameter and is stronger than the screw forming portion 84, the sliding portion 83 can be prevented from being broken even if the inner peripheral surface of the elongated hole 68 contacts the peripheral surface of the sliding portion 83 and a load is applied. .

  When the position of the bolt 81 in the long hole 68 is located behind the box body 22 (see FIG. 5), the operation panel 21 is in a position close to the support shaft 42. The back surface of the operation panel 21 comes into contact with the open end of the box body 22. The fixing screws 26 are tightened by aligning the positions of the plurality of holes (not shown) provided on the outer periphery of the operation panel 21 with the positions of the plurality of holes (not shown) provided at the opening end of the box body 22 (see FIG. 3). In this way, the operation panel 21 can be fixed to the open end of the front surface of the box body 22. When the operation panel 21 is rotated around the support shaft 42 in a state where the operation panel 21 is close to the support shaft 42, the rotation locus of the shaft support side end portion 15 of the operation panel 21 is that of the box body 22. Since it hits the opening end, the operation panel 21 cannot be rotated.

  A procedure for rotating the operation panel 21 with respect to the box body 22 will be described with reference to FIGS. The operator rotates the operation panel 21 from the box body 22 when inspecting, repairing, or replacing parts of the operation panel 21. When the operation panel 21 is rotated with respect to the box body 22, the fixing screw 26 that has fixed the operation panel 21 is removed. The nut 87 fastened to the bolt 81 is loosened. In the connecting portion between the supported member 60 and the door-side fixing member 70, the door with respect to the supported member 60 is such that the position of the bolt 81 in the elongated hole 68 is located in the forefront (front side) of the box body 22. The side fixing member 70 is pulled forward and slid (see FIG. 6).

  When the position of the bolt 81 in the long hole 68 is located in the foremost position of the box body 22 (see FIG. 7), the operation panel 21 is at the position farthest from the support shaft 42. The back surface of the operation panel 21 is separated from the open end of the box body 22. In this state, the rotation trajectory of the shaft support side end 15 of the operation panel 21 does not hit the opening end of the box body 22, so that the operation panel 21 can be rotated around the support shaft 42.

  As described above, when the operation panel 21 is rotated, the distance between the support shaft 42 and the operation panel 21 is increased, and the rotation radius of the operation panel 21 is extended to ensure the rotation locus of the operation panel 21. The operation panel 21 can be rotated.

  As described above, in the machine tool 1 of the present embodiment, the hinge mechanism 30 that opens and closes the operation panel 21 is provided in the operation box 20 provided in the splash cover 3. In the hinge mechanism 30, the door-side hinge 50 that connects the support shaft 42 and the operation panel 21 is configured in a rectangular frame shape in plan view (see FIG. 6), and the width dimension in the left-right direction is reduced. Thereby, the width direction dimension K (refer FIG. 6) between the outer edge part of the liquid crystal screen 27 and the outer edge part of the operation panel 21 can be reduced. That is, since the size in the width direction of the operation panel 21 can be reduced while maintaining the size of the liquid crystal screen 27, it is possible to contribute to space saving of the machine tool 1. In the hinge mechanism 30, the operation panel 21 is closest to the support shaft 42 when the operation panel 21 is fixed to the box body 22. In this state, the opening end of the box body 22 is in the way, and the operation panel 21 cannot be rotated.

  In the hinge mechanism 30, the door-side hinge 50 is composed of two parts, a supported member 60 and a door-side fixing member 70, and the box-side hinge 40 pivotally supports the door-side fixing member 70 fixed to the operation panel 21. It is connected to the supported member 60 so as to be movable. The door-side fixing member 70 is moved so that the distance between the support shaft 42 and the operation panel 21 is increased. Since the turning radius of the operation panel 21 can be extended, the turning locus of the operation panel 21 can be secured and the operation panel 21 can be turned.

  The present invention is not limited to the above embodiments, and various modifications can be made. For example, in the above-described embodiment, the long hole 68 is provided in the connecting portion 66 of the supported member 60 of the door-side hinge 50 and the insertion hole 72 is provided in the door-side fixing member 70, but the long hole is provided in the door-side fixing member 70. The insertion portion may be provided in the connecting portion 66 of the supported member 60.

  In the above embodiment, the operation panel 21 that rotates in the left-right direction has been described as an example, but the present invention can also be applied to a door that rotates in the up-down direction.

  The door opening / closing mechanism of the present invention can be applied not only to an operation box of a machine tool but also to various boxes having doors having doors pivotally supported in the vicinity of the opening of the panel.

DESCRIPTION OF SYMBOLS 1 Machine tool 2 Base 3 Splash cover 20 Operation box 21 Operation panel 22 Box main body 27 Liquid crystal screen 30 Hinge mechanism 40 Box side hinge 42 Support shaft 50 Door side hinge 60 Supported member 68 Long hole 70 Door side fixing member 72 Insertion hole 81 Bolt 82 Hexagonal part 83 Sliding part 84 Screw forming part 87 Nut

Claims (5)

In the door opening and closing mechanism that opens and closes the opening provided on the front surface of the box with a door rotatably supported by the hinge shaft by a hinge provided in the vicinity of the opening,
The hinge is
A door-side hinge provided at an end of the door to be supported;
Provided in the vicinity of the opening, and is configured with a box-side hinge that rotatably supports the door-side hinge on the shaft,
The door side hinge is
In the state where the box-side hinge is supported by the shaft and the opening is closed by the door, the other end opposite to the one end of the side supported by the shaft is directed toward the front of the opening. A plate-like supported portion extending ;
A plate-like door-side fixing portion having one end fixed to the door side;
From the connection mechanism that connects the other end side opposite to the one end side of the door side fixing portion to the other end side of the supported portion so as to be movable in parallel with the extending direction of the other end side. door opening and closing mechanism, characterized in that it is configured. The coupling mechanism is
An elongated hole provided in the other end side of the supported portion or the other end side of the door-side fixing portion and having a length in the extending direction;
A bolt engages loosely before Symbol slot,
An insertion hole that is provided on the other end side of the door-side fixing portion or the supported portion that is not provided with the elongated hole, and into which the bolt engaged with the elongated hole is inserted,
The door opening / closing mechanism according to claim 1, wherein the door opening / closing mechanism comprises a nut fastened to the bolt inserted into the insertion hole . The bolt includes a cylindrical screw forming portion, a cylindrical sliding portion having a diameter larger than the screw forming portion, and an operation portion on the same axis .
Length in the axial direction of the sliding portion, wherein, wherein the length the supported portion having holes formed or long Ikoto than the thickness of the elongated hole the door side fixing portion is formed Item 3. A door opening and closing mechanism according to Item 2. An operation box having an operation panel for operating the machine,
A door that is provided at the opening of the front face of the operation box, supports the operation panel, and is supported to be openable and closable ,
An operation box comprising the door opening and closing mechanism according to any one of claims 1 to 3. A machine tool for machining a workpiece,
A machine tool comprising the operation box according to claim 4.

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