Machine tools

Abstract

To provide a machine tool that allows a smaller machine width while securing a required minimum opening width.SOLUTION: A machine tool 1 includes a master door 21 and a slave door 22 on a front wall 11 of a cover 3. The master door 21 and the slave door 22 open and close an opening provided in the front wall 11. The master door 21 and the slave door 22 are of double-leaf type, such that the master door 21 moves by sliding on a right side of the opening 20 and the slave door 22 moves by sliding on a left side of the opening 20. On the front wall 11, an operation panel 15 is installed on the right side of the opening 20. The opening 20 is therefore offset to the left side from a center in a width direction of the front wall 11. When the opening 20 is opened and closed, a length in the movement direction of the slave door 22 is 1 / 2 of the length in the movement direction of the master door 21. Thus, even if an area on the left side of the opening part 20 is small, the slave door 22 can be arranged in the left side area due to movement of the slave door 22 by half the amount of movement of the master door 21 along with movement of the master door 21.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a machine tool. [Background technology]

[0002] The machine tool described in Patent Document 1 has a cover. An opening is provided in the center of the front of the cover, and an operation panel is provided next to it. Two doors that swing open on both sides are provided in the opening. The two doors move by the same amount when opening and closing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-141762 Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of a machine tool with a narrow machine width, the opening is provided in the front of the cover in a portion excluding the area where the operation panel is attached, so the center of the opening is offset to one side from the center of the machine. In this case, the area between the opening and one end of the front of the cover becomes narrow, making it difficult to widen the opening width.

[0005] An object of the present invention is to provide a machine tool that can reduce the machine width while ensuring the minimum necessary opening width. [Means for solving the problem]

[0006] The machine tool of claim 1 is a machine tool equipped with two double-hinged doors for opening and closing an opening in a wall, characterized in that the center position of the wall in the direction of movement of the two doors is different from the contact position where the two doors come into contact with each other when the opening is closed, and the length of one of the two doors in the direction of movement is different from the length of the other door in the direction of movement. Since the lengths of one door and the other door in the direction of movement are different, the width of the machine tool can be reduced while ensuring the minimum necessary width of the opening. The width of the machine tool is the width of the wall, the length parallel to the direction of movement of the doors.

[0007] The machine tool of claim 2 may include a follow-up mechanism that causes the sliding movement of the one door to follow the sliding movement of the other door. Since the opening can be opened and closed by simply sliding one door, operability can be improved.

[0008] The tracking mechanism of the machine tool of claim 3 may include a first fixed pulley provided on the side of the wall portion that faces the one door when the opening is open, a first movable pulley provided on the other door, and a first wire portion having one end fixed to a first fixed portion provided on the one door and the other end fixed to a second fixed portion provided on the other door, via the first fixed pulley and the first movable pulley, and the other end fixed to a second fixed portion provided on the other door closer to the one door than the first movable pulley. The tracking mechanism utilizes the principle of pulleys. When one door is slid from an open state to a closing state, one end of the first wire is pulled in the closing direction, and the first wire pulls the first movable pulley in the closing direction based on the position of the first fixed pulley. As a result, when closing the opening, the other door moves a smaller amount than the one door, allowing the other door to close with less force. This makes door operation easier.

[0009] The tracking mechanism of the machine tool of claim 4 may further include a second fixed pulley provided on the wall portion on the side of the other door when the opening is closed, a second movable pulley provided on the other door and positioned closer to the one door than the second fixed pulley, and a second wire portion having one end fixed to the first fixed portion and the other end fixed to the second fixed portion, passing from the one end to the second fixed portion via the second fixed pulley and the second movable pulley. When one door is slid in the opening direction from a closed state, one end of the second wire is pulled in the opening direction, so the second wire pulls the second movable pulley in the opening direction based on the position of the second fixed pulley. As a result, even when the opening is opened, the other door moves a smaller amount than the one door, so the other door can be closed with less force, making the door opening and closing operations easier.

[0010] The tracking mechanism of the machine tool of claim 5 may include a first lever having a long shape and one end rotatably connected to the one door; a second lever having a long shape and one end rotatably connected to the other end opposite the one end of the first lever; a third lever having one end rotatably connected to the other end opposite the one end of the second lever and the other end opposite the one end rotatably connected to the other door; and a fulcrum shaft provided between the one end and the other end of the second lever and rotatably supported on the wall portion, wherein the lengths of the first lever and the third lever may be different from each other. The tracking mechanism uses a link mechanism with three levers to cause the opening and closing operation of one door to follow the opening and closing operation of the other door. Since the lengths of the first lever and the third lever are different from each other, the ratio between the amount of movement of one door and the amount of movement of the other door can be freely changed.

[0011] The tracking mechanism of the machine tool of claim 6 may include: a first rack gear provided on the one door and parallel to the direction of movement of the one door; a second rack gear provided on the other door, arranged parallel to and facing the first rack gear and having a gear ratio different from that of the first rack gear; and a pinion gear arranged between the first rack gear and the second rack gear and including a first pinion portion meshing with the first rack gear and a second pinion portion meshing with the second rack gear. The tracking mechanism uses a rack and pinion to cause the opening and closing operation of one door to follow the opening and closing operation of the other door. Because the gear ratios of the first rack gear and the second rack gear are different, the ratio between the amount of movement of one door and the amount of movement of the other door can be freely changed.

[0012] A handle may be provided on one of the doors of the machine tool of claim 7. By operating the handle on one door, the other door follows, allowing the opening to be opened or closed. The other door can be moved with a light force, allowing it to be operated with one hand.

[0013] The machine tool of claim 8 may include a machine unit that machines a workpiece and a cover that surrounds the machine unit, the wall being a front wall of the cover, and the machine unit including a table that holds the workpiece on its upper surface and is fixed in its left-right position, a spindle head that rotatably supports a spindle to which a tool is attached while facing the upper surface of the table, and a column that supports the spindle head in a vertically movable manner and is movable left-right. Even in the case of a so-called column traverse type machine tool in which the table is fixed in its left-right position and the column moves left-right, the amount of movement of one door and the other door can be changed, allowing the center of the table and the opening to be aligned. This improves operability, such as workpiece replacement through the opening and manual attachment and detachment of tools to and from the spindle, even in a machine tool with a narrow machine width.

[0014] The first wire portion and the second wire portion of the machine tool of claim 9 may be formed from a single wire, and the other end of the first wire portion and the other end of the second wire portion may be fixed in a connected state to each other at the second fixing portion. Because the first wire portion and the second wire portion can be formed from a single wire, the number of parts can be reduced.

[0015] Of the walls of the machine tool of claim 10, the length in a direction parallel to the movement direction of a first wall portion, which is a wall portion closer to the one door than the opening, may be longer than the length in a direction parallel to the movement direction of a second wall portion, which is a wall portion closer to the other door than the opening. In this configuration, the area between the opening and the outer end of the second wall portion is narrower than the area between the opening and the outer end of the first wall portion. Even with this configuration, for example, by making the length in the movement direction of the other door shorter than the length in the movement direction of the one door, the width of the machine tool can be reduced while ensuring the minimum necessary width of the opening. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a machine tool 1 (parent and child doors: closed). [Figure 2] FIG. 1 is a front view of machine tool 1 (parent and child doors: closed). [Figure 3] FIG. 1 is a perspective view of a machine tool 1 (parent and child doors: open). [Figure 4] FIG. 1 is a front view of machine tool 1 (parent and child door: open). [Figure 5] FIG. 10 is a perspective view of the front wall 11 (parent and child door: open) seen from the rear side. [Figure 6] FIG. 10 is a perspective view of the front wall 11 (parent and child door: closed) seen from the rear side. [Figure 7] FIG. 10 is a diagram showing the arrangement of a first wire 101 (parent-child door: open). [Figure 9] FIG. 10 is a diagram showing the arrangement of a first wire 101 (parent-child door: closed). [Figure 8] FIG. 10 is a diagram showing the arrangement of a second wire 102 (parent-child door: open). [Figure 10] FIG. 10 is a diagram showing the arrangement of the second wire 102 (parent-child door: closed). [Figure 11]10 is a rear view of the parent-child door with the link mechanism 70 attached. FIG. [Figure 12] 10 is a rear view of a parent-child door with a rack and pinion mechanism 80 attached. DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment of the present invention will be described. Below, the left and right, front and rear, and up and down of the machine tool 1 will be explained using the directions of the arrows shown in the drawings. The left and right, front and rear, and up and down refer to the X-axis, Y-axis, and Z-axis of the machine tool 1.

[0018] The configuration of machine tool 1 will be described with reference to Figures 1 to 4. Machine tool 1 comprises a base 2, a machine section 5, and a cover 3. Base 2 is made of iron and has a roughly rectangular parallelepiped shape that is long in the front-to-rear direction. Machine section 5 is provided on top of base 2. Machine section 5 comprises a column 6, a spindle head 7, a spindle 8, and a table 10. Column 6 is fixed to the rear of the top surface of base 2, and base 2 supports column 6 so that it can move in the X-axis direction. Spindle head 7 is provided in front of column 6 so that it can move up and down in the Z-axis direction. Spindle 8 is rotatably supported within spindle head 7 and extends in the Z-axis direction. Spindle 8 has a tool mounting hole (not shown) at its lower end. Tool 9 is mounted in the tool mounting hole. Table 10 is provided on the front side of the top surface of base 2 and is movable in the Y-axis direction. The workpiece is fixed to the top surface of table 10 with a jig. The machine unit 5 performs machining on the workpiece fixed to the upper surface of the table 10 by moving the tool 9 attached to the spindle 8 and the workpiece relatively in the X-axis, Y-axis, and Z-axis directions. Machining includes, for example, milling, drilling, tapping, cutting, etc.

[0019] The cover 3 is provided on the upper part of the base 2 and surrounds the machine unit 5. The cover 3 has a front wall 11, a right wall 12, a left wall 13, a back wall 14, and a top wall (not shown), and is a generally rectangular parallelepiped that is vertically long and narrow. A vertically long rectangular opening 20 is provided in the center of the front wall 11. The opening 20 is offset slightly to the left from the center of the width of the front wall 11. A pair of double-hinged doors, a main door 21 and a sub door 22, are provided in the opening 20. The main door 21 is located on the right side, and the sub door 22 is located on the left side. When the main door 21 is moved left or right, the sub door 22 moves in the opposite direction to the main door 21, thereby opening and closing the opening 20. Note that when the main door 21 and the sub door 22 close the opening 20, the contact position where the left end of the main door 21 and the right end of the sub door 22 come into contact with each other is shifted leftward from the center position of the cover 3 in the left and right direction. In the following description, the parent door 21 and the child door 22 will be referred to collectively as the parent-child door. The positions of the parent door 21 and the child door 22 when they are fully opened will be referred to as the "open position," and the positions of the parent door 21 and the child door 22 when they are closed will be referred to as the "closed position."

[0020] An upper plate 111 is provided above the opening 20, and a lower plate 112 is provided below it. The upper plate 111 has a horizontally long rectangular shape when viewed from the front. The lower plate 112 also has a horizontally long, approximately rectangular shape when viewed from the front. The left-right length of the lower plate 112 is approximately the same as the left-right length of the upper plate 111, and the up-down length of the lower plate 112 is shorter than the up-down length of the upper plate 111.

[0021] A right side plate portion 113 is provided on the right side of the opening 20, and a left side plate portion 114 is provided on the left side. The right side plate portion 113 has a vertically long rectangular shape when viewed from the front. The left-right length of the right side plate portion 113 is slightly longer than the left-right length of the main door 21. A space is provided on the back side of the right side plate portion 113 for arranging the main door 21 in the open position. The left side plate portion 114 has a vertically long rectangular shape when viewed from the front. The left-right length of the left side plate portion 114 is shorter than the left-right length of the right side plate portion 113 and slightly longer than the left-right length of the sub-door 22. A space is provided on the back side of the left side plate portion 114 for arranging the sub-door 22 in the open position.

[0022] An operation panel 15 is attached to the front surface of the right side plate portion 113. The operation panel 15 is a vertically elongated, approximately rectangular shape when viewed from the front, and has a left-right length that is approximately the same as that of the right side plate portion 113. The left end of the operation panel 15 is located slightly to the right of the left end of the right side plate portion 113. The right end of the operation panel 15 protrudes slightly to the right from the right end of the right side plate portion 113. The operation panel 15 is equipped with a liquid crystal display, a touch panel, various keys, various buttons, etc., and receives various inputs related to the operation of the mechanical portion 5.

[0023] A rectangular opening 23 is provided in the right wall 12 of the cover 3. A lid cover 24 is removably attached to the opening 23 from the right side. A rectangular opening 25 is also provided in the left wall 13. A lid cover 26 is removably attached to the opening 25 from the left side. A user can perform operations such as inspecting the machine part 5, manually attaching and detaching a tool 9 to the spindle 8, and replacing a workpiece on the top surface of the table 10 from the right or left side through the openings 23, 25 in the right wall 12 or left wall 13.

[0024] An upper guide rail 28 is provided on the upper side of the back surface of the front wall 11. The upper guide rail 28 extends in the left-right direction and is supported approximately horizontally by fasteners (not shown) relative to the lower side of the back surface of the upper plate portion 111, the upper side of the back surface of the right plate portion 113, and the upper side of the back surface of the left plate portion 114. The upper guide rail 28 supports the upper sides of the main door 21 and the sub door 22 so that they can slide in the left-right direction. A shielding plate 38 (see FIG. 5) is provided behind the upper guide rail 28. The shielding plate 38 extends in the left-right direction and is provided between the upper inner surface of a protruding piece 115 of the right plate portion 113 and the upper inner surface of a protruding piece 116 of the left plate portion 114. The protruding piece 115 protrudes rearward from the right end of the right plate portion 113. The protruding piece 116 protrudes rearward from the left end of the left plate portion 114. The shielding plate 38 is inclined obliquely backward from the lower end to the upper end, and prevents chips scattered from the machine part 5 side from adhering to the upper guide rail 28.

[0025] A support part 35 is fixed to the right side of the rear surface of the right side plate part 113, and the support part 35 rotatably supports a fixed pulley 51. The axis of the fixed pulley 51 extends in the front-to-rear direction. A support part 42 is fixed to the left end side of the rear surface of the upper plate part 111, and the support part 42 rotatably supports the fixed pulley 52. ​​The axis of the fixed pulley 51 extends in the front-to-rear direction. A wire fixing part 43 is fixed directly below the fixed pulley 52. ​​An interposing part 45 is fixed between the wire fixing part 43 and the support part 42. A predetermined gap 46 is provided between the interposing part 45 and the rear surface of the upper plate part 111.

[0026] A lower guide rail 29 is provided on the lower back side of the front wall 11. The lower guide rail 29 extends in the left-right direction parallel to the upper guide rail 28, and is supported approximately horizontally by fixtures (not shown) against the back side of the lower plate portion 112, the lower back side of the right plate portion 113, and the lower back side of the left plate portion 114. The lower guide rail 29 supports the lower sides of the main door 21 and the sub door 22 from below, and supports them movably in the left-right direction.

[0027] The structure of the main door 21 will be described. As shown in FIG. 2, the main door 21 has a vertically elongated, approximately rectangular shape when viewed from the front. A window 211 is provided in approximately the center of the main door 21. The window 211 is a substantially rectangular opening, and a glass plate 212 (see FIG. 5) covers the window 211. This allows the user to view the inside of the cover 3 through the window 211. A handle 27 is provided at the left end of the front surface of the main door 21, protruding forward. As shown in FIG. 5, a guided portion 31 is provided at the upper end of the main door 21. The guided portion 31 is a plate member that is horizontally elongated, approximately rectangular when viewed from the rear, and has a bent portion (not shown) on its front side. The bent portion is bent into a U-shape in cross section and engages with the upper guide rail 28 from below. This allows the guided portion 31 to be guided in the left-right direction along the upper guide rail 28.

[0028] A wire fixing portion 32 is fixed to the upper rear surface of the guided portion 31. The wire fixing portion 32 includes a support portion 33 and a fixing portion 34. The support portion 33 extends diagonally upward and to the left from the upper rear surface of the guided portion 31. The fixing portion 34 is provided at the upper portion of the support portion 33 and is generally U-shaped in rear view. The fixing portion 34 includes a lower plate portion 340, a right plate portion 341, a left plate portion 342, and a middle plate portion 344. The lower plate portion 340 has a generally elongated rectangular shape in plan view, extending to both the left and right sides from the upper end of the support portion 33. The right plate portion 341 protrudes upward from the right end of the lower plate portion 340. The left plate portion 342 protrudes upward from the left end of the lower plate portion 340. A hole (not shown) penetrating in the left-right direction is provided in the upper portion of the right plate portion 341. A hole (not shown) penetrating in the left-right direction is also provided in the upper part of the left plate part 342. The middle plate part 344 protrudes upward from the center in the left-right direction of the upper surface of the lower plate part 340, and is generally rectangular in rear view. A pair of holes 345 aligned on the left and right are provided in the upper part of the middle plate part 344. When the main door 21 is in the open position, the fixed part 34 is positioned below and to the left of the fixed pulley 51 (see FIG. 5).

[0029] The structure of the child door 22 will be described. As shown in FIG. 2, the child door 22 has a vertically long rectangular shape when viewed from the front. The left-right width of the child door 22 is shorter than the left-right width of the main door 21. A window 221 is also provided at approximately the center of the child door. The window 221 is a substantially rectangular opening, and a glass plate 222 (see FIG. 5) covers the window 221. This allows the user to view the inside of the cover 3 through the window 221. As shown in FIG. 5, a guided portion 41 is provided at the upper end of the child door 22. The guided portion 41 is a plate member that is horizontally long and substantially rectangular when viewed from the rear, and a bent portion 41A is provided on its front side. The bent portion 41A is bent into a U-shape in cross section and engages with the upper guide rail 28 from below. This allows the guided portion 41 to be guided in the left-right direction along the upper guide rail 28.

[0030] An L-shaped portion 44 is fixed to the back surface of the guided portion 41. The L-shaped portion 44 includes a horizontal portion 441 and a vertical portion 442. The horizontal portion 441 is fixed along the upper end of the back surface of the guided portion 41 and extends rightward beyond the right end of the guided portion 41. The right end side of the horizontal portion 441 is inserted from left to right into the gap 46 between the intervening portion 45 and the back surface of the upper plate portion 111. The vertical portion 442 extends vertically upward from the left end of the horizontal portion 441. A movable pulley 61 is rotatably supported on the back surface of the L-shaped portion 44 at a portion where the horizontal portion 441 and the vertical portion 442 intersect at right angles. A movable pulley 62 is rotatably supported at the upper end of the back surface of the vertical portion 442. A movable pulley 63 is rotatably supported at the right end of the back surface of the horizontal portion 441. The axes of the movable pulleys 61 to 63 extend in the front-rear direction.

[0031] 7 and 9, a method for arranging the first wire 101 and the second wire 102 will be described. As shown in Fig. 7, one end 101A of the first wire 101 is inserted from right to left through a hole in the right plate portion 341 of the wire fixing portion 32 and fixed to one end of the spring 85. The other end of the spring 85 is fixed to a hole 345 on the right side of the middle plate portion 344. Two retaining rings 94, 95 are fixed to one end 101A of the first wire 101. The retaining ring 94 is fixed to the right side of the right plate portion 341, and the retaining ring 95 is fixed to the left side of the right plate portion 341.

[0032] The first wire 101 extends from one end 101A fixed to the wire fixing portion 32, passes through the fixed pulley 51, turns back 180 degrees to the left, passes through the movable pulley 62 on the sub-door 22 side, turns back 90 degrees downward, and then passes through the movable pulley 61, turns back 90 degrees to the right, and the other end 101B is fixed to the left side of the wire fixing portion 43. As a result, the first wire 101 is bent into a substantially U-shape that opens to the right by the movable pulleys 61 and 62. The straight portion of the first wire 101 from the fixed pulley 51 to the movable pulley 62 and the straight portion from the movable pulley 61 to the wire fixing portion 43 are substantially parallel to each other. This prevents the straight portion from the fixed pulley 51 to the movable pulley 62 from coming into contact with the fixed pulley 52 and its surroundings.

[0033] 9, one end 102A of the second wire 102 is inserted from left to right through a hole in the left plate portion 342 of the wire fixing portion 32 and fixed to one end of the spring 86. The other end of the spring 86 is fixed to a hole 345 on the left side of the middle plate portion 344. Two retaining rings 96, 97 are also fixed to one end 102A of the second wire 102. The retaining ring 96 is fixed to the left side of the left plate portion 342, and the retaining ring 97 is fixed to the right side of the left plate portion 342.

[0034] The second wire 102 extends leftward from one end 102A fixed to the wire fixing part 32, turns back to the right via the fixed pulley 52, and then turns back to the left via the movable pulley 63, with the other end 102B fixed to the right side of the wire fixing part 43. As a result, the second wire 102 is bent by the fixed pulley 52 and the movable pulley 63 into a generally inverted S-shape when viewed from behind.

[0035] The opening and closing operation of the double door will be described with reference to FIGS. <Open to close> As shown in FIGS. 3 to 5 , when the opening 20 is open, the main door 21 is in an open position on the rear side of the right plate portion 113 of the front wall 11, and the sub-door 22 is in an open position on the rear side of the left plate portion 114 of the front wall 11. The user grips the handle 27 of the main door 21 and moves the main door 21 to the left. Accordingly, as shown in FIG. 7 , the wire fixing portion 32 pulls one end 101A of the first wire 101 to the left. As the middle plate portion 344 moves to the left, the one end 101A is pulled to the left by the spring force of the spring 85. At this time, the spring 85 stretches in the left-right direction, but the retaining ring 94 abuts against the right surface of the right plate portion 341, so the one end 101A is pulled to the left by the wire fixing portion 32.

[0036] Since the other end 101B of the first wire 101 is fixed to the wire fixing part 43, the first wire 101 rotates the fixed pulley 51 counterclockwise in rear view, while pulling the movable pulleys 61 and 62 to the right. At this time, the other end 101B side is pulled to the right via the movable pulleys 61 and 62, so that the movable pulleys 61 and 62 rotate counterclockwise in rear view.

[0037] As a result, the L-shaped portion 44 is pulled to the right, causing the subsidiary door 22 to move to the right. As described above, the first wire 101 is folded back 180° in the opposite direction by the movable pulleys 61, 62. Therefore, according to the principle of a pulley, when the main door 21 moves to the left, the subsidiary door 22 moves to the right by half the amount of movement. The subsidiary door 22 moves at half the speed of the main door 21. As shown in FIG. 8, the wire fixing portion 32 moves to the left and approaches the support portion 42. Then, when the main door 21 closes the right two-thirds of the opening 20 and the subsidiary door 22 closes the left one-third of the opening 20, the left end of the main door 21 and the right end of the subsidiary door 22 come into contact, and the opening 20 is closed (see FIG. 6).

[0038] 9, with the other end 102B of the second wire 102 fixed to the wire fixing portion 43, the portion between the fixed pulley 52 and the wire fixing portion 43 is pushed to the right by the movable pulley 63. As a result, the second wire 102 is pulled toward the wire fixing portion 43 (see FIG. 10).

[0039] 6, when the opening 20 is closed, one end 101A of the first wire 101 and one end 102A of the second wire 102 are pulled toward each other via the springs 85, 86 and the middle plate 344 at the fixing portion 34 of the wire fixing portion 32. As a result, the first wire 101 and the second wire 102 are not loosened and are in a state in which a certain tension is applied, so that the main door 21 and the sub door 22 can be prevented from moving on their own from the closed state.

[0040] <Opening from closed state> 1, in order to open the opening 20 from a closed state, a user grasps the handle 27 of the main door 21 and slides the main door 21 to the right. Accordingly, as shown in FIG. 10, the wire fixing portion 32 pulls one end 102A of the second wire 102 to the right. Here, since the one end 102A is fixed to the middle plate portion 344 via the spring 86, as the middle plate portion 344 moves to the right, the one end 102A is pulled to the right by the spring force of the spring 86. Here, the spring 86 extends in the left-right direction, but the retaining ring 96 abuts against the left surface of the left plate portion 342, so the one end 102A is pulled to the right by the wire fixing portion 32.

[0041] The other end 102B of the second wire 102 is fixed to the wire fixing portion 43, and the position of the fixed pulley 52 is fixed, so the second wire 102 rotates the fixed pulley 52 counterclockwise as viewed from behind, while pushing the movable pulley 63 back to the left. The L-shaped portion 44 is pushed back to the left, so the secondary door 22 slides to the left. At this time, too, due to the pulley principle, when the primary door 21 moves to the right, the secondary door 22 moves to the left by half the amount of movement. Then, when the primary door 21 moves to the open position on the back side of the right side plate portion 113 of the front wall 11, and the secondary door 22 moves to the open position on the back side of the left side plate portion 114, the opening 20 is opened.

[0042] In the above explanation, the front wall 11 is an example of a "wall portion" of the present invention. The opening 20 is an example of an "opening" of the present invention. The main door 21 is an example of a "one door" of the present invention. The secondary door 22 is an example of a "other door" of the present invention. The fixed pulley 51 is an example of a "first fixed pulley" of the present invention. The movable pulleys 61 and 62 are examples of a "first movable pulley" of the present invention. The wire fixing portion 32 is an example of a "first fixed portion" of the present invention. The fixed pulley 52 is an example of a "second fixed pulley" of the present invention. The movable pulley 63 is an example of a "second movable pulley" of the present invention. The right side plate portion 113 of the front wall 11 is an example of a "first wall portion" of the present invention, and the left side plate portion 114 is an example of a "second wall portion" of the present invention.

[0043] As described above, the machine tool 1 of this embodiment is provided with the main door 21 and the sub door 22 on the front wall 11 of the cover 3. The main door 21 and the sub door 22 open and close the opening 20 provided in the front wall 11. The main door 21 and the sub door 22 are double-hinged, with the main door 21 moving to the right of the opening 20 and the sub door 22 moving to the left of the opening 20. The operation panel 15 is attached to the right of the opening 20 on the front wall 11. Therefore, the opening 20 is shifted to the left from the center of the front wall 11 in the width direction. On the other hand, the opening 20 needs to have a minimum opening width so that it faces the front of the table 10, so that operations such as fixing or removing a workpiece from the table 10 can be performed from the front. As a result, the area on the left side of the opening 20 is narrower than the area on the right side where the operation panel 15 is attached. In this embodiment, when the opening 20 is opened or closed, the length of the sub door 22 in the moving direction is set to half the length of the main door 21 in the moving direction. As a result, even if the area to the left of opening 20 is narrow, sub-door 22 can be placed in the left-hand area by moving sub-door 22 by half the amount of movement in accordance with the movement of main door 21. As a result, machine tool 1 can minimize the machine width while ensuring the minimum necessary width of opening 20, so that machine tool 1 can be installed in a convenient location even in a narrow space.

[0044] In particular, in the machine tool 1 of this embodiment, since the table 10 cannot be moved in the X-axis direction, by ensuring that the minimum necessary opening width is ensured so that the opening 20 faces the front of the table 10, a machine tool 1 with good operability can be provided, which makes it easy to replace the workpiece on the table 10, etc.

[0045] The machine tool 1 uses the principle of a pulley to make the secondary door 22 follow the sliding movement of the primary door 21. The machine tool 1 is provided with a fixed pulley 51, movable pulleys 61 and 62, and a first wire 101 on the cover 3. The fixed pulley 51 is provided on the front wall 11 on the side of the primary door 21 when the opening 20 is open. The movable pulleys 61 and 62 are provided on the secondary door 22. One end 101A of the first wire 101 is fixed to a wire fixing part 32 provided on the primary door 21, and the other end 101B passes from the one end 101A through the fixed pulley 51 and the movable pulleys 62 and 61 to a wire fixing part 43 provided on the secondary door 22 on the parent door 21 side of the movable pulleys 61 and 62. When the main door 21 is moved from an open state in the closing direction, one end 101A of the first wire 101 is pulled in the closing direction, and the first wire 101 pulls the movable pulleys 61, 62 in the closing direction based on the position of the fixed pulley 51. As a result, when closing the opening 20, the secondary door 22 moves a smaller amount than the primary door 21, so the secondary door 22 can be closed with a light force. This makes it easy to operate the main door 21 and the secondary door 22. Because the secondary door 22 follows the movement of the main door 21, both the main door 21 and the secondary door 22 can be moved by simply operating the main door 21. In addition, the main door 21 is provided with a handle 27, so that a user can operate both the main door 21 and the secondary door 22 by grasping the handle 27 and operating the main door 21, thereby opening and closing the opening 20.

[0046] The machine tool 1 further includes a fixed pulley 52, a movable pulley 63, and a second wire 102 on the cover 3. The fixed pulley 52 is provided on the front wall 11 on the side of the subsidiary door 22 when the opening 20 is closed. The movable pulley 63 is provided on the subsidiary door 22 and is positioned closer to the main door 21 than the fixed pulley 52. ​​One end 102A of the second wire 102 is fixed to a wire fixing portion 32 provided on the main door 21, and the other end 102B is fixed from the one end 102A to a wire fixing portion 43 via the fixed pulley 52 and the movable pulley 63. When the main door 21 is slid in the opening direction from the closed state, the one end 102A of the second wire 102 is pulled in the opening direction, and therefore the second wire 102 pulls the movable pulley 63 in the opening direction based on the position of the fixed pulley 52. As a result, even when opening the opening 20, the sub-door 22 moves by an amount smaller than that of the main door 21, so that the sub-door 22 can be closed with a light force.

[0047] The present invention is not limited to the above embodiment, and various modifications are possible. In the above embodiment, the child door 22 moves following the movement of the parent door 21 by using the principle of a pulley, but other methods of following may also be used. Two modifications will be described below.

[0048] A first modified example will be described. As shown in FIG. 11, the machine tool may use a link mechanism 70 to move the subsidiary door 22 following the movement of the main door 21. The link mechanism 70 includes a first lever 71, a second lever 72, a third lever 73, spindles 75 and 77, a fulcrum shaft 76, and connecting shafts 78 and 79. The first lever 71, the second lever 72, and the third lever 73 are all elongated. The first lever 71 is longer than the third lever 73. The spindle 75 is provided at the upper rear surface of the main door 21. The spindle 76 is located at a position facing the upper portion of the portion where the main door 21 and the subsidiary door 22 abut against each other when the main door 21 and the subsidiary door 22 are closed. The spindle 76 is supported by a support member (not shown) fixed to the rear surface of the upper plate portion 111 of the front wall 11. The spindle 77 is provided at the upper rear surface of the subsidiary door 22.

[0049] The support shaft 75 rotatably supports one end 711 of the first lever 71. The connecting shaft 78 rotatably connects the other end 712 of the first lever 71 to one end 721 of the second lever 72. The fulcrum shaft 76 rotatably supports the second lever 72 at a position closer to the other end 722 than the approximate center in the length direction of the second lever 72. The connecting shaft 79 rotatably connects the other end 722 of the second lever 72 to one end 731 of the third lever 73. The support shaft 77 rotatably supports the other end 732 of the third lever 73.

[0050] As in the above embodiment, when the handle 27 is gripped and the main door 21 is moved to the right, one end 711 of the first lever 71 is pulled to the right. Accordingly, one end 721 of the second lever 72 is pulled to the right, causing the second lever 72 to rotate counterclockwise around the fulcrum shaft 76 as viewed from behind. Accordingly, the other end 722 of the second lever 72 moves to the left, and the other end 732 of the third lever 73 is pushed to the left, causing the sub-door 22 to move to the left. As described above, the third lever 73 is shorter than the first lever 71. The lever ratio (the ratio of the lengths of the respective lever members) of the first lever 71, the second lever 72, and the third lever 73 is adjusted so that the movement amount of the sub-door 22 is half that of the main door 21. With this link mechanism 70, the sub-door 22 can be moved in response to the movement of the main door 21, as in the above embodiment, and the movement amount can be varied when opening and closing.

[0051] A second modified example will be described. As shown in FIG. 12, the machine tool may use a rack-and-pinion mechanism 80 to move the child door 22 in response to the movement of the main door 21. The rack-and-pinion mechanism 80 includes a first rack gear 81, a second rack gear 82, and a pinion gear 90. The first rack gear 81 is fixed to the upper left end of the inner surface of the main door 21 and extends linearly to the left. A first gear surface 81A having a large number of teeth arranged in the left-right direction is provided on the lower surface of the first rack gear 81. The second rack gear 82 is fixed to the upper right end of the inner surface of the child door 22 and extends linearly to the right. The second rack gear 82 is disposed below the first rack gear 81 and facing the first rack gear 81 with the pinion gear 90 in between. A second gear surface 82A having a large number of teeth arranged in the left-right direction is provided on the upper surface of the second rack gear 82. The ratio of the number of teeth (gear ratio) between the first gear surface 81A and the second gear surface 82A is different from each other. Specifically, the number of teeth on the second gear surface 82A may be greater than the number of teeth on the first gear surface 81A, and for example, the gear ratio between the first gear surface 81A and the second gear surface 82A may be 1:2.

[0052] The pinion gear 90 is disposed between the first rack gear 81 and the second rack gear 82. The pinion gear 90 is rotatably supported by a support member (not shown) fixed to the rear surface of the upper plate portion 111 of the front wall 11, with its rotation axis facing the front-rear direction. The pinion gear 90 is a two-stage gear, and coaxially connects a first pinion 91 and a second pinion 92, which are substantially cylindrical and have different diameters. The first pinion 91 is formed on the front side of the pinion gear 90, and the second pinion 92 is formed on the rear side of the pinion gear 90. The first pinion 91 meshes with the first gear surface 81A. The second pinion 92 meshes with the second gear surface 82A.

[0053] As in the above embodiment, when the handle 27 is grasped and the main door 21 is moved to the right while the main door 21 and the sub door 22 are closed, the first rack gear 81 also moves to the right together with the main door 21. As a result, the pinion gear 90 rotates counterclockwise as viewed from the rear. As the pinion gear 90 rotates, the second rack gear 82 is pushed to the left, and the sub door 22 moves to the left together with the second rack gear 82. As a result, the main door 21 and the sub door 22 move in opposite directions, and the opening 20 is opened.

[0054] The gear ratio between the first gear surface 81A and the second gear surface 82A is 1:2, so if the movement amount of the first rack gear 81 is 1, the movement amount of the second rack gear 82 is half that, ie, 1 / 2. Therefore, even in the second modified example, the child door 22 can be moved by an amount smaller than the movement amount of the main door 21, and the child door 22 can be closed with a light force.

[0055] The present invention can be modified in various ways in addition to the above-described first and second modified examples. In the above embodiment, two wires, the first wire 101 and the second wire 102, are used, but it is also possible to use a single wire. For example, the other end 101B of the first wire 101 and the other end 102B of the second wire 102 may be connected to each other to form a single wire, and the connected portion may be attached to the wire fixing portion 43 by crimping. Conversely, the first wire 101 and the second wire 102 may each be made up of a plurality of wires.

[0056] The operation panel 15 may be omitted from the right side plate portion of the front wall 11 of the cover 3. The arrangement of the main door 21 and the sub door 22 may be reversed depending on the arrangement of the operation panel 15.

[0057] 5, in the above embodiment, two movable pulleys 61, 62 are fixed side by side in the vertical direction to the vertical portion 442 of the L-shaped portion 44 fixed to the sub-door 22, but there may be one or more movable pulleys fixed to the vertical portion 442. In addition, the fixed pulleys 51, 52 and the movable pulleys 61 to 63 all have the same diameter, but they may have different diameters.

[0058] In the above embodiment, the main door 21 is manually moved using the handle 27, but it may also be an automatic door in which the main door 21 moves automatically when an open / close button is pressed, for example. In this case, an actuator that moves the main door 21 when the open / close button is pressed may be provided. With this configuration, the secondary door 22 also moves following the automatically moving main door 21, so the output of the actuator can be reduced. [Explanation of symbols]

[0059] 1 Machine tools 3 Cover 5. Mechanical Department 6. Column 7 Spindle head 8 spindle 9 Tools 10 tables 11 Front wall 20 Opening 21 Main door 22 Sub-door 27 Toride 32 Wire fixing part 43 Wire fixing part 51,52 Fixed pulley 61~63 Moving pulley 70 Link mechanism 71 First Lever 72 Second Lever 73 Third Lever 76 Fulcrum Axis 80 Rack and pinion mechanism 81 1st rack gear 82 Second rack gear 90 Pinion gear 91 First pinion 92 Second pinion 101 First Wire 101A One end 101B Other end 102 Second Wire 102A One end 102B Other end

Claims

1. A machine tool having two double-hinged doors that open and close an opening provided in a wall, the two doors sliding to come close to each other and contact each other to close the opening, and sliding away from each other to open the opening, a follow-up mechanism that causes one of the two doors to follow the sliding movement of the other door, thereby simultaneously closing the opening with the two doors; a center position of the wall portion in the movement direction of the two doors and a contact position where the two doors come into contact with each other when the two doors close the opening are different from each other; The length of the one door in the movement direction is different from the length of the other door in the movement direction, The tracking mechanism is a first fixed pulley provided on the wall portion on the one door side when the opening portion is open; a first movable pulley provided on the other door; a first wire portion having one end fixed to a first fixing portion provided on the one door, and having the other end fixed to a second fixing portion provided on the other door, via the first fixed pulley and the first movable pulley, the second fixed portion being provided on the other door closer to the one door than the first movable pulley; a second fixed pulley provided on the wall portion on the other door side when the opening is closed; a second movable pulley provided on the other door and positioned closer to the one door than the second fixed pulley; a second wire portion having one end fixed to the first fixed portion, and having the other end fixed to the second fixed portion via the one end and the second fixed pulley and the second movable pulley; Having A machine tool characterized by:

2. A machine tool having two double-hinged doors that open and close an opening provided in a wall, the two doors sliding to come close to each other and come into contact with each other to close the opening, and moving away from each other to open the opening, a follow-up mechanism that causes one of the two doors to follow the sliding movement of the other door, thereby simultaneously closing the opening with the two doors; a center position of the wall portion in the movement direction of the two doors and a contact position where the two doors come into contact with each other when the two doors close the opening are different from each other; The length of the one door in the movement direction is different from the length of the other door in the movement direction, The tracking mechanism is a first lever having an elongated shape and one end of which is rotatably connected to the one door; a second lever having an elongated shape and one end rotatably connected to the other end of the first lever opposite to the one end; a third lever having an elongated shape, one end of which is rotatably connected to the other end of the second lever opposite to the one end of the second lever, and the other end of which is rotatably connected to the other door; a fulcrum shaft provided between the one end and the other end of the second lever and rotatably supported on the wall portion; Equipped with The length of the first lever and the length of the third lever are different from each other. A machine tool characterized by:

3. A machine tool having two double-hinged doors that open and close an opening provided in a wall, the two doors sliding to come close to each other and come into contact with each other to close the opening, and moving away from each other to open the opening, a follow-up mechanism that causes one of the two doors to follow the sliding movement of the other door, thereby simultaneously closing the opening with the two doors; a center position of the wall portion in the movement direction of the two doors and a contact position where the two doors come into contact with each other when the two doors close the opening are different from each other; The length of the one door in the movement direction is different from the length of the other door in the movement direction, The tracking mechanism is a first rack gear provided on the one door and parallel to the moving direction of the one door; a second rack gear provided on the other door, arranged parallel to and facing the first rack gear, and having a gear ratio different from that of the first rack gear; a pinion gear disposed between the first rack gear and the second rack gear, the pinion gear including a first pinion portion meshing with the first rack gear and a second pinion portion meshing with the second rack gear; Having A machine tool characterized by:

4. The one door is provided with a handle.

4. The machine tool according to claim 1, wherein:

5. a machine part for processing the workpiece; a cover that surrounds the mechanical part, The wall portion is a front wall portion of the cover, The mechanical part comprises: a table on whose upper surface the workpiece is held and whose position in the left-right direction is fixed; a spindle head that rotatably supports a spindle to which a tool is attached while facing the upper surface of the table; a column that supports the spindle head so that it can be raised and lowered and is movable in the left and right directions; Having 5. The machine tool according to claim 1, wherein:

6. the first wire portion and the second wire portion are formed by a single wire, The other end of the first wire portion and the other end of the second wire portion are fixed in a connected state to each other at the second fixing portion.

2. The machine tool according to claim 1,

7. Among the wall portions, a first wall portion which is a wall portion closer to one door than the opening has a length in a direction parallel to the movement direction longer than a length in a direction parallel to the movement direction of a second wall portion which is a wall portion closer to the other door than the opening.

7. The machine tool according to claim 1, wherein:

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