Door drive device and machine tool equipped with the door drive device

Abstract

A door drive device (100) comprises: a pair of pulleys (111, 112); an endless belt (113) rotatably wound on the pulleys (111, 112); and a single drive source (114) that rotates the endless belt (113). The endless belt (113) is disposed at a position separated toward a door back-surface side with respect to first and second doors (21, 22) in a closed state. The door drive device (100) comprises a first connection member that connects the first door (21) with one flat belt part (113a) of the endless belt (113), and a second connection member that connects the second door (22) with the other flat belt part (113b).

Description

[Technical Field]

[0001] The present invention relates to a door drive device that drives an opening / closing door consisting of a first door and a second door that are aligned in a predetermined direction in a closed state, and to a machine tool equipped with the door drive device. [Background technology]

[0002] One example of this type of door drive device is disclosed in Japanese Patent Laid-Open Publication No. 2010-194707 (hereinafter referred to as Patent Document 1). This door drive device is used to drive an opening / closing door provided in a machine tool. The opening / closing door is provided in an opening of a machine cover that covers the machining chamber of the machine tool. The opening / closing door is composed of a left door and a right door that are aligned in the left-right direction when closed. The door drive device has a left drive cylinder connected to the left door and a right drive cylinder connected to the right door. The left door and the right door are configured to be driven in opposite directions by the drive cylinders connected to them to open and close the opening.

[0003] In this door drive device, a drive cylinder (drive source) is provided for each of the left and right doors (first and second doors), which increases the number of parts and leads to increased costs.

[0004] To address this issue, a door drive device capable of opening and closing both left and right doors with a single actuator can be used, as disclosed in, for example, Japanese Patent Laid-Open Publication No. 2019-139659 (see Patent Document 2 below). This door drive device includes a pair of pulleys spaced apart horizontally, an endless belt wound around the pair of pulleys, and a motor that drives and rotates the endless belt. The endless belt is positioned directly above the opening that is opened and closed by the left and right door sections. The endless belt includes a pair of opposing flat belt sections and a pair of curved sections that engage with the pulleys. The left door is connected to one of the flat belt sections, and the right door is connected to the other flat belt section.

[0005] According to this door drive device, when the motor rotates the endless belt in the forward direction, the left and right doors move closer to each other to perform a door-closing operation, whereas when the motor rotates the endless belt in the opposite direction, the left and right doors move away from each other in the left-right direction to perform a door-opening operation. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-194707 [Patent Document 2] Japanese Patent Application Publication No. 2019-139659 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the door drive device shown in Patent Document 2, the endless belt is located directly above the opening, so when trying to transport a large workpiece from the outside to the inside of the machine tool, for example, the belt interferes with the workpiece, limiting the size of the workpiece that can be transported or making it difficult to transport the workpiece into the machine tool using a crane or other device in the factory.

[0008] The present invention was made in consideration of the above-mentioned circumstances, and its purpose is to improve convenience when, for example, carrying in workpieces, by using an endless belt to open and close the first and second doors with a single drive source. [Means for solving the problem]

[0009] In one aspect of the present invention to solve the above problem, A door drive device that drives an opening / closing door consisting of a first door and a second door that are aligned in a predetermined direction in a closed state, a pair of pulleys spaced apart in the predetermined direction; an endless belt rotatably wound around the pair of pulleys; a single drive source for rotating the endless belt; the endless belt is composed of a pair of flat belt portions facing each other and a pair of curved portions that engage with the pulleys to connect the pair of flat belt portions to each other, The first door is connected to one flat belt portion of the endless belt, The second door is connected to the other flat belt portion of the endless belt, When the drive source rotates the endless belt in a predetermined forward direction, the first door and the second door perform a door-closing operation in which they move toward each other in the predetermined direction, and when the drive source rotates the endless belt in a direction opposite to the forward direction, they perform a door-opening operation in which they move away from each other in the predetermined direction, The endless belt is disposed at a position spaced apart from the rear surface of the first door and the second door when the first door and the second door are in a closed state, a first connecting member that connects the first door and one flat belt portion of the endless belt; The door drive device further includes a second connecting member that connects the second door and the other flat belt portion of the endless belt.

[0010] This door drive device utilizes the fact that a pair of flat belt portions move in opposite directions when the endless belt rotates, allowing the door to be driven to open and close using a single drive source. That is, when the endless belt is driven to rotate by a single drive source, the pair of flat belt portions move in opposite directions in a predetermined direction, which is the direction in which the pair of pulleys move apart. Here, a first door is connected to one flat belt portion, and a second door is connected to the other flat belt portion. Therefore, the first door and the second door move in opposite directions when the endless belt rotates. When the endless belt is rotated in the forward direction, the first door and the second door move toward each other in the predetermined direction, thereby achieving a door-closing operation. When the endless belt is rotated in the reverse direction, the first door and the second door move away from each other, thereby achieving a door-opening operation. Driving the two doors (the first door and the second door) that make up the door to be opened and closed using a single drive source in this way reduces the number of parts and reduces product costs.

[0011] Furthermore, according to the door drive device, the endless belt is positioned at a distance toward the rear of the first and second doors. Therefore, when the first and second doors are open, the endless belt and the beam member that stores it are not located directly above where the first and second doors were located when they were closed. This means that, for example, a large workpiece will not interfere with the door drive device when being carried into the machining chamber. Furthermore, when a workpiece is suspended by a crane and carried into the machining chamber, wires or the like will not interfere with the endless belt, making it easier to carry in the workpiece.

[0012] It is preferable that the opening is formed in a lateral side wall of the machine tool so that its upper end is open, the predetermined direction is a horizontal direction along the lateral side wall, a predetermined functional space facing the opening is provided on the back side of the door, an upper opening portion is formed in the ceiling wall of the machine tool that opens the predetermined functional space upward and is connected to the upper end of the opening, the endless belt is arranged on the back side of the door than the upper opening portion and above the predetermined functional space, the first connecting member is arranged above the predetermined functional space and is configured to connect the first door and one of the flat belt portions of the endless belt, and the second connecting member is arranged above the predetermined functional space and is configured to connect the second door and the other flat belt portion of the endless belt.

[0013] According to this, when the first door and the second door are opened, the worker can access a predetermined functional space inside the machine tool through the opening. Here, the upper end of the opening is connected to an upper opening formed in the ceiling wall of the machine tool, and the endless belt is arranged on the rear side of the door (rear side) than this upper opening. Therefore, even if the worker is, for example, a crane suspended from the ceiling or a tall robot, they can access the predetermined functional space by using the space opened up by the upper opening without interfering with the endless belt.

[0014] The predetermined functional space is preferably a machining chamber of the machine tool, and is preferably a space within a setup station adjacent to the machining chamber of the machine tool.

[0015] In the machining chamber or setup station of a machine tool, workers often go deep into the space to load or unload workpieces or change pallets, which can easily cause interference between the workers and the endless belt. The present invention is particularly useful for such configurations. In the present invention, interference between the workers and the endless belt can be avoided by locating the endless belt closer to the rear of the first and second doors.

[0016] The first door and the second door each have a boundary side edge portion located on the boundary side of the other door when closed, and an anti-boundary side edge portion located on the opposite side from the boundary side, and when at least one of the first door and the second door performs a door-opening operation, the boundary side edge portion moves linearly outward in the specified direction while the entire door rotates around a specified axis parallel to the boundary side edge portion, and the anti-boundary side edge portion moves toward the back surface of the door and outward in the specified direction, and when performing a door-closing operation, the door is a pivoting door that moves in the opposite direction to when the door is opened, and it is preferable that the door further comprises a guide mechanism that regulates the movement path of the pivoting door when opening and closing.

[0017] With this, at least one of the first door and the second door operates as a pivoting door, which reduces the installation width of the first door and the second door in the predetermined direction when the doors are open, compared to when both the first door and the second door are configured as linear movement doors that move linearly along the predetermined direction.

[0018] It is preferable that the connecting member of the first connecting member and the second connecting member that is connected to the pivotable door is connected to the boundary side end of the pivotable door via a connecting shaft that forms the specified axis.

[0019] According to this, the swingable door rotates around the connecting shaft as a fulcrum when opening or closing, and therefore the swingable door and the endless belt can be connected by the connecting member without interfering with the swingable door's movement.

[0020] The door drive device is arranged adjacent to the endless belt and comprises a guide bar extending in the predetermined direction, and a sliding bushing that slidably engages with the guide bar in the extension direction, and the connecting member connected to the pivoting door is formed in the shape of a triangular beam including a base side portion extending in the predetermined direction, an orthogonal side portion extending from one end of the base side portion in a direction perpendicular to the base side portion, and an inclined side portion connecting the tip of the orthogonal side portion to the other end of the base side portion, and it is preferable that the base side portion is fixed to the sliding bushing and the tip of the orthogonal side portion is connected to the pivoting door via the connecting shaft.

[0021] According to this, by forming the connecting frame into a triangular beam shape, sufficient space for the swinging door to swing can be secured between the inclined side and the swinging door. Also, by supporting the base side of the connecting frame on the guide bar via the sliding bushing, rattle during movement of the connecting frame can be prevented, allowing the swinging door to open and close smoothly.

[0022] The specified direction is the left-right direction when viewed from the front side of the door, the boundary side edge extends in the vertical direction, the guide mechanism has a lower end guide portion that guides the lower end of the swivel-moving door along a predetermined movement path, and it is preferable that the lower end guide portion has a wheel that is attached to the lower end of the swivel-moving door and is rotatable around a horizontal axle and swivelable around a vertical axis extending in the vertical direction, and a rail bar that engages with the wheel from below and regulates the movement path of the wheel.

[0023] According to this, the lower end of the swingable door is guided by the lower end guide along a predetermined movement path. The swingable door then performs opening and closing operations while swinging about an axis extending in the vertical direction parallel to the boundary side edge of the door. The movement path of the swingable door during opening and closing operations is regulated by engagement between the wheels attached to the lower end and the rail bar. The wheels are attached to the swingable door so as to be swingable about a vertical axis extending in the vertical direction. Therefore, the swingable door's swing movement can be prevented from being hindered by the wheels.

[0024] The guide mechanism preferably has an upper end guide portion that guides the upper end of the swivel-moving door along a predetermined movement path, and the upper end guide portion is preferably configured to guide the upper end of the swivel-moving door by engaging a guide groove or guide hole with a protruding pin.

[0025] According to this, the upper end of the swing-type door is guided along a predetermined movement path by the upper end guide part. Therefore, the movement path of the swing-type door can be stabilized compared to when the swing-type door is guided only by the lower end guide part. Furthermore, the guide function can be realized with a simple structure of engagement between the guide hole or guide groove and the protruding pin.

[0026] The first door and the second door may be linear movement type doors that move linearly in the specified direction when opening or closing the doors, and may be provided with a guide mechanism that regulates the movement path of the linear movement type doors when opening or closing the doors.

[0027] According to this, the first and second doors are guided by the guide mechanism so as to move linearly in a predetermined direction when opening and closing the doors. By configuring the first and second doors as linear movement doors in this way, the connection structure between the endless belt and each door can be simplified.

[0028] a machine tool including the door drive device, the opening / closing door driven by the door drive device, and an outer wall having the opening that is opened and closed by the opening / closing door, the opening is formed in a lateral side wall of the machine tool so as to open at an upper end side, the predetermined direction is a horizontal direction along the lateral sidewall, A predetermined functional space facing the opening is provided on the rear side of the opening and closing door, an upper opening portion is formed in a ceiling wall of the machine tool, the upper opening portion opening the predetermined functional space upward and communicating with an upper end portion of the opening portion; the endless belt is disposed on the door rear side of the upper opening and above the predetermined functional space, the first connecting member is arranged above the predetermined functional space and is configured to connect the first door and the one flat belt portion of the endless belt, The second connecting member relates to a machine tool that is arranged above the specified functional space and is configured to connect the second door and the other flat belt portion of the endless belt.

[0029] According to this machine tool, when the first and second doors are opened, the worker can access the designated functional space by using the space opened by the upper opening without interfering with the endless belt. This configuration is particularly useful when the worker is, for example, a crane suspended from the ceiling or a tall robot.

[0030] It is preferable that the machine tool has a machining chamber where workpiece machining is performed, and the predetermined functional space is the machining chamber. It is also preferable that the machine tool has a machining chamber where workpiece machining is performed and a workpiece setup station provided adjacent to the machining chamber, and the predetermined functional space is a space within the setup station. [Effects of the Invention]

[0031] According to the present invention, the endless belt is positioned at a distance from the rear surface of the first and second doors when they are closed, and a first connecting member connects the first door to one flat belt portion of the endless belt, and a second connecting member connects the second door to the other flat belt portion of the endless belt.This makes it possible to use the endless belt to perform door opening and closing operations with a single drive source, while preventing interference with the endless belt when the worker accesses the work object through the opening. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is an external perspective view of a machine tool equipped with a door drive device according to an embodiment, showing a state in which the opening / closing door is closed; [Figure 2] 1 is an external perspective view of a machine tool equipped with a door drive device according to an embodiment, showing a state in which the opening / closing door is open; [Figure 3] FIG. 10 is a perspective view of the machine tool with the splash guard removed, viewed from diagonally below the front, showing the state in which the opening and closing door is closed. [Figure 4] FIG. 10 is a perspective view of the machine tool with the splash guard removed, viewed from diagonally below the front, showing the state in which the opening and closing door is open. [Figure 5] FIG. 2 is a perspective view of the door drive device as seen from diagonally above on the right side, showing the state in which the opening and closing door is closed. [Figure 6] FIG. 2 is a perspective view of the door drive device as seen from diagonally above on the right side, showing the state in which the opening and closing door is open. [Figure 7] FIG. 2 is an enlarged perspective view showing a left fixing bracket. [Figure 8] FIG. 8 is a schematic cross-sectional view taken along line VIII-VIII in FIG. 5. [Figure 9] 10 is a plan view of the lower end guide portion of the guide mechanism as viewed from below, showing the state in which the opening and closing door is closed. FIG. [Figure 10] 10 is a plan view of the lower end guide portion of the guide mechanism as viewed from below, showing the state in which the opening / closing door is closed. FIG. [Figure 11] 1, showing a mounting structure of a first right door wheel to a right door. FIG. [Figure 12] FIG. 4 is an enlarged perspective view showing an upper end guide portion of the guide mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0033] <<Embodiment>> 1 and 2 are external perspective views showing a machine tool 1 equipped with a door drive device 100 according to an embodiment. In the following description, the front and rear sides refer to the front and rear sides of the machine tool 1, and the left and right sides refer to the left and right sides when the machine tool 1 is viewed from the front.

[0034] The machine tool 1 is a horizontal machining center, and is entirely covered by a splash guard 3. The machine tool 1 has a setup station 1a that forms its front half, a machining chamber 1b located behind the setup station 1a, and a rotary pallet exchanger (not shown) that exchanges pallets between the setup station 1a and the machining chamber 1b. The splash guard 3 is a component that covers the space 4 within the setup station 1a and the space (not shown) within the machining chamber 1b, and forms the overall appearance of the machine tool 1. The splash guard 3 is formed with a front opening K1 for accessing the space 4 within the setup station 1a. The machine tool 1 also has an opening / closing door 2 that opens and closes the front opening K1, and a door drive device 100 that drives the opening / closing door 2.

[0035] [Splash guard] The splash guard 3 is formed by welding multiple sheet metal members. The splash guard 3 has a substantially rectangular parallelepiped shape that covers the front, rear, left, right, and ceiling sides of the machine tool 1. As shown in FIG. 2, the front opening K1 is formed in the front wall 3a (an example of a lateral wall) of the splash guard 3. When viewed from the front of the machine tool 1, the front opening K1 has a rectangular shape that opens upward. The upper end of the front opening K1 communicates with an upper opening K2 formed in the ceiling wall 3b of the splash guard 3. The ceiling wall 3b of the splash guard 3 has a first ceiling wall portion 3c that covers the rear half of the machine tool 1 and a second ceiling wall portion 3d that is connected to the front end of the first ceiling wall portion 3c and has a belt drive mechanism 110 installed on its upper surface. The upper opening K2 is located adjacent to and in front of the second ceiling wall portion 3d. When viewed from above, the upper opening K2 has a rectangular shape that is elongated in the left-right direction and opens forward.

[0036] [Opening and closing door] As shown in FIG. 3, the openable / closable door 2 includes a left door 21 and a right door 22 that are aligned in the left-right direction (an example of a predetermined direction) in the closed state. The left door 21 corresponds to the first door, and the right door 22 corresponds to the second door. The left door 21 and the right door 22 cooperate with each other in the closed state to close the front opening K1. When the left door 21 and the right door 22 are driven from the closed state to the open direction by the door drive device 100, the left door 21 moves linearly to the left, and the right door 22 moves to the right while rotating counterclockwise in a plan view. As a result, as shown in FIG. 4, the space 4 within the setup station 1a of the machine tool 1 is opened through the front opening K1. This allows a crane or an operator to access the space 4 within the setup station 1a through the front opening K1.

[0037] 3 and 4, the left door 21 is formed by welding a plurality of sheet metal members. Specifically, the left door 21 has a rectangular vertical plate 21a that is long in the vertical direction, an inclined plate 21b that extends diagonally upward and rearward from the upper edge of the vertical plate 21a, a horizontally protruding plate 21c that protrudes horizontally rearward from the rear surface of the inclined plate 21b, a lower horizontal plate 21d that protrudes horizontally rearward from the lower edge of the vertical plate 21a, and a lower vertical plate 21e that extends vertically downward from the rear edge of the lower horizontal plate 21d.

[0038] As shown in FIG. 5, the front edge of a ceiling slide plate 155 is fixed by welding to the upper surface of the horizontal protruding plate 21c of the left door 21. The ceiling slide plate 155 has a rectangular shape in a plan view and is disposed so as to straddle the upper open portion K2 in the front-rear direction. The rear edge of the ceiling slide plate 155 is supported on the second ceiling wall portion 3d of the splash guard 3 via a horizontal support plate 156 so as to be slidable in the left-right direction. The horizontal support plate 156 is an elongated sheet metal member extending in the left-right direction and is fixed to the front edge of the second ceiling wall portion 3d. The ceiling slide plate 155 is fixed to the endless belt 113 of the door drive device 100 via a left-side fixed bracket 117, which will be described later. Thus, the ceiling slide plate 155 functions as a first connecting member that connects the left door 21 and the endless belt 113.

[0039] A window portion 21f covered with transparent polycarbonate is formed over almost the entire vertical plate 21a of the left door 21. A pair of left door wheels 133 are attached to the lower end of the lower vertical plate 21e. The left door wheels 133 are part of the lower end guide portion 130 described below and are supported by a rail bar 131.

[0040] The right door 22 is formed by welding a plurality of sheet metal members together, similar to the left door 21. Specifically, the right door 22 has a rectangular vertical plate 22a that is long in the vertical direction, an inclined plate 22b that extends diagonally upward and rearward from the upper edge of the vertical plate 22a, an upper horizontal plate 22c that protrudes horizontally rearward from the upper edge of the inclined plate 22b, a lower horizontal plate 22d that protrudes horizontally rearward from the lower edge of the vertical plate 22a, and a horizontal protruding plate 22e that protrudes horizontally rearward from the rear side surface of the inclined plate 22b.

[0041] A window portion 22f covered with transparent polycarbonate is formed over almost the entire vertical plate 22a of the right door 22. A pair of right door wheels 134 are attached to the underside of the lower end horizontal plate 22d. The right door wheels 134 are supported by a right rail bar 132, which is part of the lower end guide portion 130, which will be described later.

[0042] [Door drive device] 5 and 6, the door drive device 100 has a belt drive mechanism 110 that drives the left door 21 and the right door 22 by an endless belt 113, and a guide mechanism 160 that guides the left door 21 and the right door 22 along a predetermined movement path. The guide mechanism 160 has a lower end guide portion 130 (see FIGS. 2 and 3) that guides the lower end portions of the left door 21 and the right door 22, and an upper end guide portion 150 that guides the upper end portions of the left door 21 and the right door 22.

[0043] [Belt drive mechanism] The belt drive mechanism 110 has a first pulley 111 and a second pulley 112 arranged at a distance in the left-right direction, an endless belt 113 wound around the first pulley 111 and the second pulley 112, and a drive motor 114 (an example of a drive source).

[0044] The first pulley 111 and the second pulley 112 are arranged with their respective rotation axes facing the front-rear direction. The first pulley 111 and the second pulley 112 are arranged so as to be positioned outward in the left-right direction from the opening and closing door 2 in the closed state.

[0045] The drive motor 114 is fixed to a motor mounting plate 115 with its output shaft facing the front-to-rear direction. The motor mounting plate 115 is made of a square plate material erected on the upper surface of the second ceiling wall portion 3d of the splash guard 3. The motor mounting plate 115 is arranged with its thickness direction coinciding with the front-to-rear direction. The drive motor 114 is fixed to the motor mounting plate 115 from the rear side with bolts. The rotation output shaft of the drive motor 114 passes through a through-hole formed in the center of the motor mounting plate 115. The operation of the drive motor 114 is controlled by a control device (not shown).

[0046] The first pulley 111 is fixed to the rotary output shaft of the drive motor 114 so as to rotate integrally. A plurality of teeth arranged in the circumferential direction are formed on the outer peripheral surface of the first pulley 111 over the entire circumference. A plurality of teeth that can engage with the teeth of the first pulley 111 are formed on the inner peripheral surface of the endless belt 113 over the entire circumference. The teeth on the outer peripheral surface of the first pulley 111 engage with the teeth on the inner peripheral surface of the endless belt 113, so that the rotational driving force of the first pulley 111 is transmitted to the endless belt 113. The first pulley 111 functions as a drive pulley that drives the endless belt 113.

[0047] The second pulley 112 is rotatably supported by a pair of pulley mounting plates 116 fixed to the upper surface of the second ceiling wall portion 3d of the splash guard 3. The pair of pulley mounting plates 116 are arranged with a slight gap between them in the front-to-rear direction and rotatably support both ends of the rotary shaft of the second pulley 112. The second pulley 112 has the same shape and dimensions as the first pulley 111, and the outer circumferential surface of the second pulley 112 is formed with a plurality of teeth around the entire circumferential direction, which can engage with the teeth formed on the inner circumferential surface of the endless belt 113. Thus, the second pulley 112 functions as a driven pulley that rotates in response to the rotation of the endless belt 113.

[0048] The endless belt 113 is composed of a pair of flat belt portions 113a, 113b that face each other in the vertical direction, and a pair of curved portions 113c, 113d that abut (engage) with the outer peripheral surfaces of the first pulley 111 and the second pulley 112 and connect the pair of flat belt portions 113a, 113b.

[0049] The pair of flat belt portions 113a and 113b face each other with a gap corresponding to the diameter of each of the pulleys 111 and 112 in the vertical direction.

[0050] The upper flat belt portion 113a is connected to the left door 21 via a left fixed bracket 117 and a ceiling slide plate 155 (see FIG. 5). As shown in FIG. 7, the left fixed bracket 117 has a bracket main body 117a whose tip end is fixed to the ceiling slide plate 155, a belt engagement plate 117b fixed to the upper surface of the base end of the bracket main body 117a, and a belt clamping plate 117c that clamps the upper flat belt portion 113a between the bracket main body 117a and the belt engagement plate 117b. The bracket main body 117a and the ceiling slide plate 155 are fixed with bolts 140. The belt clamping plate 117c is secured to the belt engagement plate 117b with bolts 141. The upper surface of the belt engagement plate 117b has a plurality of V-shaped grooves aligned in the left-right direction that engage with the teeth formed on the lower surface of the flat belt portion 113a. This prevents the flat belt portion 113a from slipping in the left-right direction between the belt engaging plate 117b and the belt holding plate 117c.

[0051] 6, the lower flat belt portion 113b is connected to the right door 22 via a right fixed bracket 118 and a connecting frame 119 (corresponding to the second connecting member). The base end of the right fixed bracket 118 is fixed to the flat belt portion 113b by a belt clamping plate 118a, and the tip end is fixed to the connecting frame 119 by a bolt 143. The configuration of the right fixed bracket 118 is similar to the configuration of the above-mentioned left fixed bracket 117, so a detailed description thereof will be omitted.

[0052] The connecting frame 119 is composed of a main frame portion 119a and a plate-shaped sub-frame portion 119b that covers the upper side of the main frame portion 119a. The connecting frame 119 is arranged to straddle in the front-rear direction the upper open portion K2 between the right door 22 and the endless belt 113. The connecting frame 119 is supported by a guide bar 120 that extends in the left-right direction via a pair of sliding bushes 121.

[0053] The guide bar 120 is a cylindrical member extending in the left-right direction and is disposed adjacent to the front side of the endless belt 113. Both ends of the guide bar 120 are supported by a pair of support members 123. The pair of support members 123 are fixed to horizontal plate portions of L-shaped brackets 122 fixed to the front end surface of the second ceiling wall portion 3d. The pair of sliding bushes 121 are formed by forming sliding holes in rectangular parallelepiped blocks that are long in the left-right direction. Each sliding bush 121 is configured to be movable in the left-right direction with the sliding hole formed in each sliding bush 121 fitted onto the guide bar 120.

[0054] The main frame portion 119a of the connecting frame 119 has a base beam 119c, an orthogonal beam 119d, and an inclined beam 119e. The base beam 119c is an angle member with an L-shaped cross section extending in the left-right direction and is fixed to the upper surfaces of the pair of sliding bushes 121 with bolts 144. The orthogonal beam 119d extends forward from the left end (one end) of the base beam 119c, and its cross section perpendicular to its extension direction is U-shaped, opening upward. A lock mechanism 6 for locking the left door 21 and the right door 22 is provided on the upper surface of the tip of the orthogonal beam 119d. The inclined beam 119e extends leftward from the right end (other end) of the base beam 119c toward the front side and is connected to the front end of the orthogonal beam 119d. The cross section perpendicular to its extension direction is U-shaped, opening upward.

[0055] The sub-frame portion 119b is fixed to the upper side of the main frame portion 119a with bolts. The sub-frame portion 119b has a base plate portion 119f, an orthogonal plate portion 119g, and an inclined plate portion 119h that cover the upper sides of the base beam 119c, the orthogonal beam 119d, and the inclined beam 119e that constitute the main frame portion 119a.

[0056] The base beam 119c and base plate portion 119f form the base side portion 119A of the connecting frame 119, the orthogonal beam 119d and orthogonal plate portion 119g form the orthogonal side portion 119B of the connecting frame 119, and the inclined beam 119e and inclined plate portion 119h form the inclined side portion 119C of the connecting frame 119.

[0057] As shown in Fig. 8, the front end of the orthogonal beam 119d is connected to the horizontal protruding plate 22e of the right-side door 22 via a connecting shaft 124 and a bearing 125. The connecting shaft 124 is a stepped shaft whose axis A1 extends in the vertical direction and has a flange portion 124a at its lower end. The flange portion 124a is fixed to the upper surface of the horizontal protruding plate 22e with a bolt 145. Although not shown in Fig. 8, the locking mechanism 6 is provided on the side of the connecting shaft 124.

[0058] An inner ring 125a of a bearing 125 is fitted onto the upper end of the connecting shaft 124. The inner ring 125a of the bearing 125 is sandwiched between a stepped surface 124b formed on the connecting shaft 124 and a washer 126, and is fixed by a bolt 146 so as not to be movable in the vertical direction. The washer 126 and the bolt 146 may be formed integrally.

[0059] The bolt 146 is threaded into a threaded hole 124c formed in the center of the connecting shaft 124. The bolt 146 and washer 126 are located inside a relief hole 119i formed in the front end of the orthogonal beam 119d so as not to interfere with the orthogonal beam 119d. The outer ring 125b of the bearing 125 is fixed to the underside of the orthogonal beam 119d by the bolt 147 via a hollow, disk-shaped connecting member 127.

[0060] Thus, the front end of the orthogonal beam 119d is rotatable about the axis A1 of the connecting shaft 124 via the bearing 125. When the right door 22 is opened or closed, it functions as a swing-moving door that not only moves left and right but also swings around the connecting shaft 124 as a fulcrum. The axis A1 of the connecting shaft 124 corresponds to a predetermined axis that is parallel to the boundary-side edge of the swing-moving door.

[0061] [Bottom guide] Next, the details of the lower end guide portion 130 in the guide mechanism 160 will be described with reference to Figures 3, 4, 9 and 10. As shown in Figures 3 and 4, the lower end guide portion 130 has a left rail bar 131 that defines the movement path of the left door 21, a right rail bar 132 that defines the movement path of the right door 22, a pair of left door wheels 133 attached to the left door 21 and guided by the left rail bar 131, and a pair of right door wheels 134 attached to the right door 22 and guided by the right rail bar 132. The left and right rail bars 131, 132 are fixed to the inner wall surface of the splash guard 3. The left door wheel 133 and the right door wheel 134 have a rail engagement groove D (see Figure 9 described later) that is V-shaped in cross section and extends around the entire circumferential direction, at the center in the width direction of the outer circumferential surface of the wheel. The rail engagement groove D of the left door wheel 133 engages with the left rail bar 131 from above, and the rail engagement groove D of the right door wheel 134 engages with the right rail bar 132 from above. As a result, the left door wheel 133 moves along the left rail bar 131, and the right door wheel 134 moves along the right rail bar 132.

[0062] 9 is a plan view of the lower end guide portion 130 seen from below when the opening / closing door 2 is open, and FIG. 10 is a view equivalent to FIG. 9 showing the opening / closing door 2 in a closed state.

[0063] As shown in the drawings, the left rail bar 131 extends linearly in the left-right direction. The left door wheel 133 is attached to the rear surface of the lower end vertical plate 21e of the left door 21. The left door wheel 133 is guided by the left rail bar 131 so as to be movable in the left-right direction.

[0064] The right rail bar 132 has a parallel rail portion 132a and an intersecting rail portion 132b. The parallel rail portion 132a extends in a direction (left-right direction in this example) parallel to the direction of movement of the flat belt portions 113a and 113b of the endless belt 113. The intersecting rail portion 132b is disposed so as to intersect with an extension line of the parallel rail portion 132a in a plan view.

[0065] The cross rail portion 132b extends rearward and to the right from a position slightly spaced from the right end of the parallel rail portion 132a in plan view. In this example, the cross angle between the cross rail portion 132b and the parallel rail portion 132a is set to, for example, 120 to 130 degrees in plan view.

[0066] The pair of right door wheels 134 consists of a first right door wheel 134a that engages with the parallel rail portion 132a and a second right door wheel 134b that engages with the cross rail portion 132b. The first right door wheel 134a and the second right door wheel 134b are attached to the underside of the lower end horizontal plate 22d of the right door 22 so as to be rotatable about a vertical axis.

[0067] Since the mounting structure of the first right door wheel 134a and the second right door wheel 134b to the lower end horizontal plate 22d is the same, only the mounting structure of the first right door wheel 134a will be described here with reference to Figure 11, and the description of the mounting structure of the second right door wheel 134b will be omitted.

[0068] That is, the first right door wheel 134a is attached to the underside of the lower end horizontal plate 22d of the right door 22 via a caster 135 and a support bracket 136. The support bracket 136 supports the axle 137 of the first right door wheel 134a and also functions to protect the first right door wheel 134a from foreign matter such as chips. The caster 135 has a swivel shaft 135a connected to a bearing housed therein, and the support bracket 136 is fixed to this swivel shaft 135a.

[0069] Specifically, the support bracket 136 has a bracket main body portion 136a, a pair of side protection plate portions 136b, a rear protection plate portion 136c, and a caster fixing plate portion 136d.

[0070] The bracket main body 136a is formed in the shape of a rectangular plate that is long in the vertical direction, and horizontally supports the axle 137 of the first right door wheel 134a. The pair of side protection plate parts 136b are connected to both end edges in the width direction of the bracket main body 136a and face each other with a gap in the width direction. The pair of side protection plate parts 136b are arranged to cover both sides of the first right door wheel 134a in the movement direction.

[0071] The rear protective plate 136c is a rectangular plate extending downward from the lower end of the bracket main body 136a. The lower end of the rear protective plate 136c is located further below the lower end of the first right door wheel 134a. The pair of side protective plates 136b and rear protective plate 136c function as protective members that protect the first right door wheel 134a from foreign objects.

[0072] The caster fixing plate 136d is connected horizontally to the upper edge of the bracket main body 136a. The caster fixing plate 136d is fixed to the swivel shaft 135a of the caster 135 with a nut 138. The swivel shaft 135a is arranged so that its axis A2 extends vertically. The support bracket 136 is swivelable around the axis A2 of the swivel shaft 135a while supporting the first right door wheel 134a.

[0073] [Upper end guide] Next, the upper end guide portion 150 of the guide mechanism 160 will be described in detail with reference to FIGS.

[0074] The upper end guide portion 150 has the above-mentioned horizontal support plate 156 (see FIG. 5) that guides the upper end of the left door 21 so that it can move linearly in the left-right direction, and a guide hole 152 that pivotally guides the upper end of the right door 22. A cylindrical protruding pin 151 that protrudes from the right end portion is engaged with the guide hole 152, and the engagement between this guide hole 152 and the protruding pin 151 regulates the movement path of the upper end of the right door 22.

[0075] The guide hole 152 is formed in a guide plate 153. The guide plate 153 is fixed to the upper end surface of a corner wall located at the boundary between the front wall and the right side wall of the splash guard 3, with a shim plate 154 sandwiched between them. The thickness of the shim plate 154 is set so that the protruding pin 151 can engage with the guide hole 152 formed in the guide plate 153.

[0076] The guide hole 152 is a slit-shaped elongated hole that extends from the right end of the right door 22 in the closed position toward the rear and right side in a plan view. When the right door 22 is in the closed position, as shown in FIG. 5, the protruding pin 151 is located at the front end of the guide hole 152. As the right door 22 moves from the closed position to the open position, the protruding pin 151 moves diagonally rearward and rightward while engaging with the guide hole 152. Then, as shown in FIG. 6, when the right door 22 has finished moving to the open position, the protruding pin 151 moves to the rear end of the guide hole 152. As the protruding pin 151 moves along the guide hole 152, the upper end of the right door 22 is guided along a predetermined opening and closing path.

[0077] [Operation description] The driving operation of the opening / closing door 2 by the door drive device 100 configured as described above will be described. First, referring to FIG. 5, when the opening / closing door 2 is opened from a closed state, a control device (not shown) rotates the output shaft of the drive motor 114 in a counterclockwise direction (direction R1 in FIG. 5) as viewed from the front. As a result, the first pulley 111 rotates integrally with the output shaft of the drive motor 114 in the direction R1, and the endless belt 113 rotates counterclockwise as viewed from the front. This rotation causes the upper flat belt portion 113a of the endless belt 113 to move leftward, and the lower flat belt portion 113b to move rightward. As a result, the left door 21 connected to the upper flat belt portion 113a via the ceiling slide plate 155 moves leftward, and the right door 22 connected to the lower flat belt portion 113b via the connecting frame 119 moves rightward. In this way, the left door 21 and the right door 22 move away from each other and enter an open state.

[0078] During the opening operation of the opening / closing door 2, the left door 21 moves linearly to the left along the left rail bar 131 (see FIGS. 9 and 10). The left edge (boundary side edge) of the right door 22 moves linearly to the right along the parallel rail portion 132a, and the right edge (opposite the boundary side edge) moves rearward and to the right along the intersecting rail portion 132b. While moving to the right, the right door 22 then pivots in the V1 direction (see FIG. 6) around the axis A1 of the connecting shaft 124, and finally fits inside the right corner wall of the splash guard 3.

[0079] On the other hand, when closing the opening and closing door 2 that is in the open state, the output shaft of the drive motor 114 is rotated clockwise (in the R2 direction in FIG. 5) when viewed from the front side by the control device.

[0080] As a result, the first pulley 111 rotates integrally with the output shaft of the drive motor 114 in the R2 direction, and the endless belt 113 rotates clockwise when viewed from the front. As a result, the upper flat belt portion 113a of the endless belt 113 moves toward the right, and the lower flat belt portion 113b moves toward the left. As a result, the left door 21 connected to the upper flat belt portion 113a via the ceiling slide plate 155 moves to the right, and the right door 22 connected to the lower flat belt portion 113b via the connecting frame 119 moves to the left. In this way, the left door 21 and the right door 22 move toward each other and enter a closed state.

[0081] In the closing operation of the opening / closing door 2, the left door 21 moves linearly to the left along the left rail bar 131 (see FIGS. 9 and 10). The left edge (boundary side edge) of the right door 22 moves linearly to the left along the parallel rail portion 132a, and the right edge (opposite boundary side edge) moves forward and left along the intersecting rail portion 132b. Then, while moving leftward, the right door 22 pivots in the V2 direction (see FIG. 6) around the axis A1 of the connecting shaft 124, and finally stops at a closed position where it closes the right half of the front opening K1.

[0082] [Effects of this embodiment] As described above, according to the door driving device 100 of this embodiment, when the drive motor 114 drives the endless belt 113 to rotate in a predetermined forward direction (R2 direction in Figure 5), the left door 21 and the right door 22 perform a door-closing operation in which they move toward each other in the left-right direction, and when the drive motor 114 drives the endless belt 113 to rotate in the opposite direction to the forward direction (R1 direction in Figure 5), they perform a door-opening operation in which they move away from each other in the left-right direction.

[0083] This allows the left door 21 and the right door 22 that make up the opening and closing door 2 to be driven by a single common drive motor 114. This reduces the number of parts and cuts down on the cost of the device.

[0084] In this embodiment, the endless belt 113 is disposed at a position spaced apart from the rear (toward the rear surface of the doors) of the left door 21 and the right door 22 in the closed state. The door drive device 100 has a ceiling slide plate 155 that is disposed to bridge the space between the left door 21 and the upper flat belt portion 113a of the endless belt 113 and connect them, and a connecting frame 119 that is disposed to bridge the space between the right door 22 and the lower flat belt portion 113b of the endless belt 113 and connect them.

[0085] As a result, the endless belt 113 is positioned at a distance toward the rear side of the doors from the left door 21 and the right door 22, so that when the left door 21 and the right door 22 are open, the work subject such as a crane or a worker can access the space behind the doors (in this embodiment, space 4 within the setup station 1a) without coming into contact with the endless belt 113.

[0086] In this embodiment, the endless belt 113 is disposed further rearward than the upper opening K2 of the splash guard 3.

[0087] Therefore, when the left door 21 and the right door 22 are open, the work subject, such as a crane or a worker, can access the space 4 within the setup station 1a through the front opening K1 and the upper opening K2 without coming into contact with the endless belt 113 or the ceiling wall 3b of the splash guard 3.

[0088] In addition, in this embodiment, when the right door 22 performs a door-opening operation, its left edge (boundary-side edge) moves linearly outward in the left-right direction, while the entire door pivots around an axis A1 parallel to the left edge (boundary-side edge), and its right edge (anti-boundary-side edge) moves toward the back of the door and outward in the left-right direction, and when the door is closed, it is a pivoting door that moves in the opposite direction to when the door is opened, and the movement path of the right door 22 during opening and closing operations is regulated by the lower end guide portion 130 and the upper end guide portion 150.

[0089] According to this, the movement path of the right door 22 is restricted by the lower end guide portion 130 and the upper end guide portion 150 so that the right door 22 performs the above-mentioned swing movement movement during opening and closing operations. Therefore, the installation width in the left-right direction of the machine tool 1 can be reduced compared to when the right door 22 is configured as a linear movement type door.

[0090] In this embodiment, the connecting frame 119 for the right door 22, which is a pivotable door, is connected to the left end (end on the boundary side) of the right door 22 via a connecting shaft 124 that extends vertically.

[0091] According to this, when the right door 22 performs opening and closing operations, it rotates around the connecting shaft 124. Therefore, the right door 22 and the endless belt 113 can be connected by the connecting frame 119 without interfering with the rotating movement of the right door 22 by the connecting frame 119.

[0092] In this embodiment, the door drive device 100 also includes a guide bar 120 extending in the left-right direction and disposed adjacent to the endless belt 113, and a sliding bush 121 slidably engaged with the guide bar 120 in the extending direction of the guide bar 120. The connecting frame 119 is formed in a triangular beam shape including a base side portion 119A extending in the left-right direction, an orthogonal side portion 119B extending in the front-rear direction perpendicular to the base side portion 119A and connected to the left end of the base side portion 119A, and an inclined side portion 119C connecting the tip of the orthogonal side portion 119B to the right end of the base side portion 119A, and the base side portion 119A is fixed to the sliding bush 121, and the tip of the orthogonal side portion 119B is connected to the right door 22 via a connecting shaft 124.

[0093] According to this, by forming the connecting frame 119 into a triangular beam shape, it is possible to ensure a sufficient space for the right door 22 to turn between the inclined side portion 119C and the right door 22. In addition, by supporting the base side portion 119A of the connecting frame 119 on the guide bar 120 via the sliding bush 121, rattles during movement of the connecting frame 119 are prevented, and ultimately the opening and closing operation of the right door 22 can be performed smoothly.

[0094] In addition, in this embodiment, the lower end guide portion 130 has a right door wheel 134 (see Figure 11) that is attached to the lower end of the right door 22 and is rotatable around a horizontal axle 137 and can pivot around an axis A2 that extends in the vertical direction, and a rail bar 132 that engages with the right door wheel 134 from below and regulates the movement path of the right door wheel 134.

[0095] According to this, when the right door 22 swings along the rail bar 132, the right door wheel 134 rotates about the axis A2 independently of the right door 22. Therefore, it is possible to prevent the right door wheel 134 from interfering with the swing movement of the right door 22.

[0096] In addition, in this embodiment, the upper end guide portion 150 is configured to guide the upper end portion of the right door 22, which is a pivotable door, by engaging a protruding pin 151 protruding from the upper end surface of the right door 22 with a guide hole 152 formed in a guide plate 153.

[0097] According to this, the upper end of the right door can be guided by a simple structure in which the guide hole 152 and the protruding pin 151 are engaged with each other.

[0098] Other Embodiments In the above embodiment, the left door 21 is a linear moving door and the right door 22 is a swinging moving door, but this is not limiting, and both the left door 21 and the right door 22 may be swinging moving doors, or only the left door 21 may be a swinging moving door. In either case, the connection structure between the swinging moving door and the endless belt 113 can employ, for example, a link mechanism using the above-mentioned connecting frame 119 and connecting shaft 124.

[0099] Furthermore, instead of employing the pivoting door described in the above embodiment, both the left door 21 and the right door 22 may be configured as linearly moving doors. That is, the door drive device 100 may be configured to move each of the left door 21 and the right door 22 linearly in the left-right direction when performing the door opening and closing operations of the left door 21 and the right door 22. In this case, the connection structure between each of the doors 21 and 22 and the endless belt 113 may employ, for example, a connection structure via the above-mentioned ceiling slide plate 155.

[0100] In the above embodiment, the endless belt 113 is disposed behind the left door 21 and the right door 22 in the closed state (toward the rear of the doors), but this is not limited thereto. That is, the endless belt 113 may be disposed, for example, at a position spaced closer to the front of the left door 21 and the right door 22 in the closed state, or may be disposed directly above or below each door 21, 22. In the latter case, the endless belt 113 may be directly connected to each door 21, 22. This makes it possible to eliminate connecting members such as the ceiling slide panel 155 and the connecting frame 119, thereby reducing the number of parts as much as possible.

[0101] In the above embodiment, the endless belt 113 is arranged so that a pair of flat belt portions 113a, 113b face each other in the vertical direction, but this is not limited to this and may be arranged so that they face each other in the front-to-back direction, for example.

[0102] In the above embodiment, the endless belt 113 is a toothed belt having a plurality of teeth on its inner circumferential surface, but this is not limited thereto and the endless belt 113 may be a belt having no teeth on its inner circumferential surface. In this case, it is not necessary to form teeth on the outer circumferential surfaces of the first pulley 111 and the second pulley 112.

[0103] In the embodiment, the lower end guide part 130 is configured so that the rail engagement grooves D formed on the outer peripheral surfaces of the wheels 133, 134 engage with the rail bars 131, 132 in order to regulate the movement paths of the left door wheel 133 and the right door wheel 134, but this is not limited to this. For example, the left door wheel 133 and the right door wheel 134 may be engaged with rail grooves provided on the machine tool 1 side.

[0104] In the above embodiment, the parallel rail portion 132a and the cross rail portion 132b in the lower end guide portion 130 are configured as separate bodies, but this is not limitative and they may be configured as an integrated body.

[0105] In the above embodiment, the upper end guide portion 150 is configured to guide the right door 22 by engaging the protruding pin 151 fixed to the right door 22 with the guide hole 152 formed in the guide plate 153, but this is not limited to this, and the positional relationship between the protruding pin 151 and the guide hole 152 may be reversed. That is, the protruding pin 151 may be fixed to the splash guard 3, and the guide hole 152 may be formed in the right door 22. Also, a guide groove may be used instead of the guide hole 152.

[0106] In the above embodiment, the opening and closing door 2 is composed of a left door 21 and a right door 22 that are aligned in the left-right direction when closed, but this is not limited to this and may be composed of, for example, an upper door and a lower door that are aligned in the up-down direction when closed.

[0107] In the above embodiment, the connecting frame 119 is composed of the main frame portion 119a and the sub-frame portion 119b, but this is not limited to this and the connecting frame 119 may be composed of a single member. Also, the connecting frame 119 does not necessarily have to be a triangular beam shape and may be formed, for example, in a straight beam shape.

[0108] In the above embodiment, the drive motor 114 rotates the first pulley 111. The endless belt 113 is configured to rotate, but the present invention is not limited to this. For example, the second pulley 112 may be rotationally driven. Alternatively, for example, a third pulley separate from the first pulley 111 and the second pulley 112 may be provided, and the third pulley may be rotationally driven by the drive motor 114.

[0109] In addition, in the above embodiment, the drive motor 114, which is a rotary actuator, is used as the drive source for rotating the endless belt 113. However, the present invention is not limited to this, and for example, a direct-acting actuator (such as a direct-acting air cylinder) may be used. In this case, for example, the endless belt 113 can be rotated by linearly driving one flat belt portion 113a (or flat belt portion 113b) of the endless belt 113 with the direct-acting actuator.

[0110] In the above embodiment, the door 2 to be driven by the door drive device 100 is provided at the front opening K1 of the setup station 1a in the machine tool 1, but this is not limited to this. That is, for example, in a machine tool 1 that does not have a setup station 1a, the door 2 may be provided at an opening for accessing the machining chamber 1b. Furthermore, the door 2 is not limited to being provided at the machine tool 1, and may be provided at other industrial machines, such as an inspection device or a workpiece washing device. Note that when the door 2 is provided at the machine tool 1, the machine tool 1 is not limited to being a machining center as in the above embodiment, and may be, for example, a turning center or a multi-tasking machine.

[0111] It should be noted that the above-described embodiments are illustrative in all respects and are not limiting. Those skilled in the art will appreciate that modifications and variations are possible. The scope of the present invention is defined not by the above-described embodiments but by the claims. Furthermore, the scope of the present invention includes modifications from the embodiments within the scope of the claims and their equivalents. [Explanation of symbols]

[0112] A1 Axis of connecting shaft (predetermined axis) A2 Axis of the rotating shaft (vertical axis extending in the up and down direction) K1 Front opening (opening) K2 Upper open part 1 Machine tools 2 Opening and closing doors 3 Splash Guard 3a Front wall (front wall) 3b Ceiling wall (wall on the ceiling side) 4 Space 21 Left door (No. 1 door) 22 Right door (2nd door) 100 Door drive unit 111 First pulley 112 Second pulley 113 endless belt 113a Flat belt section 113b Flat belt section 113c Curved section 113d Curved section 114 Drive motor (drive source) 119 Connecting frame (second connecting member) 119A Base edge 119B Orthogonal Side 119C Slope side 120 guide bar 121 Sliding bush 124 Connecting shaft 130 Lower end guide 131 Left rail bar (rail bar) 132 Right rail bar (rail bar) 134 Right door wheel (wheel) 137 axles 150 Upper end guide 151 Protruding pin 152 Guide hole 155 Ceiling slide plate (first connecting member) 160 Guide mechanism

Claims

1. A door drive device that drives an opening / closing door that closes an opening in a closed state and is made up of a first door and a second door that are arranged in a predetermined direction, a pair of pulleys spaced apart in the predetermined direction; an endless belt rotatably wound around the pair of pulleys; a single drive source for rotating the endless belt; the endless belt is composed of a pair of flat belt portions facing each other and a pair of curved portions that engage with the pulleys to connect the pair of flat belt portions to each other, the first door is connected to one flat belt portion of the endless belt, the second door is connected to the other flat belt portion of the endless belt, The first door and the second door are configured to perform a door-closing operation in which the doors move toward each other in the predetermined direction when the endless belt is rotated by the drive source in a predetermined forward direction, and to perform a door-opening operation in which the doors move away from each other in the predetermined direction when the endless belt is rotated by the drive source in a direction opposite to the forward direction, the endless belt is disposed at a position spaced apart from the rear surface of the first door and the second door when the first door and the second door are in a closed state, a first connecting member that connects the first door and one flat belt portion of the endless belt; a second connecting member that connects the second door and the other flat belt portion of the endless belt, the first door and the second door each have a boundary side edge portion located on the boundary side of each other in a closed state, and an anti-boundary side edge portion located on the opposite side from the boundary side; At least one of the first door and the second door is a swing-moving door in which, when a door-opening operation is performed, the boundary-side edge moves linearly outward in the predetermined direction, while the entire door rotates around a predetermined axis parallel to the boundary-side edge, and the anti-boundary-side edge moves toward the rear surface of the door and outward in the predetermined direction, and when a door-closing operation is performed, the door moves in the opposite direction to the door-opening operation, The door drive device is characterized by comprising a guide mechanism that regulates the movement path of the swingable door when it is opened or closed.

2. the opening is formed in a lateral side wall of the machine tool so as to open at an upper end side, the predetermined direction is a horizontal direction along the lateral sidewall, A predetermined functional space facing the opening is provided on the rear side of the opening and closing door, an upper opening portion is formed in a ceiling wall of the machine tool, the upper opening portion opening the predetermined functional space upward and communicating with an upper end portion of the opening portion; the endless belt is disposed on the door rear side of the upper opening and above the predetermined functional space, the first connecting member is arranged above the predetermined functional space and is configured to connect the first door and the one flat belt portion of the endless belt, The door drive device according to claim 1, characterized in that the second connecting member is positioned above the specified functional space and is configured to connect the second door and the other flat belt portion of the endless belt.

3. 3. The door drive device according to claim 2, wherein the predetermined functional space is a machining room of the machine tool.

4. 3. A door drive device according to claim 2, wherein the predetermined functional space is a space within a setup station adjacent to a machining chamber of the machine tool.

5. The door drive device according to claim 1, characterized in that the connecting member connected to the pivoting door of the first connecting member and the second connecting member is connected to the boundary side end of the pivoting door via a connecting shaft that forms the specified axis.

6. a guide bar disposed adjacent to the endless belt and extending in the predetermined direction; a sliding bush that is slidably engaged with the guide bar in the extending direction of the guide bar; The door drive device of claim 5, wherein the connecting member connected to the pivoting door is formed in the shape of a triangular beam including a base side portion extending in the predetermined direction, an orthogonal side portion extending from one end of the base side portion in a direction perpendicular to the base side portion, and an inclined side portion connecting the tip of the orthogonal side portion to the other end of the base side portion, the base side portion being fixed to the sliding bush, and the tip of the orthogonal side portion being connected to the pivoting door via the connecting shaft.

7. The predetermined direction is the left-right direction as seen from the front side of the door, The boundary side edge portion extends in the vertical direction, The guide mechanism has a lower end guide portion that guides the lower end of the swing-moving door along a predetermined movement path, The door drive device according to any one of claims 1 to 6, characterized in that the lower end guide portion has a wheel attached to the lower end of the swing-moving door, which is rotatable about a horizontal axle and rotatable about a vertical axis extending in the up-down direction, and a rail bar that engages with the wheel from below to regulate the movement path of the wheel.

8. The guide mechanism has an upper end guide portion that guides the upper end of the swing-moving door along a predetermined movement path, The door drive device according to any one of claims 1 to 6, characterized in that the upper end guide portion is configured to guide the upper end of the swing-moving door by engaging a guide groove or a guide hole with a protruding pin.

9. the first door is a linear movement type door that moves linearly in the predetermined direction when performing a door opening / closing operation, and the second door is the pivot movement type door, 7. The door drive device according to claim 1, further comprising a guide mechanism for restricting a movement path of the linearly moving door during opening and closing operations.

10. 2. A machine tool comprising: the door drive device according to claim 1; the opening / closing door driven by the door drive device; and an outer wall having the opening that is opened and closed by the opening / closing door, the opening is formed in a lateral side wall of the machine tool so as to open at an upper end side, the predetermined direction is a horizontal direction along the lateral sidewall, A predetermined functional space facing the opening is provided on the rear side of the opening and closing door, an upper opening portion is formed in a ceiling wall of the machine tool, the upper opening portion opening the predetermined functional space upward and communicating with an upper end portion of the opening portion; the endless belt is disposed on the door rear side of the upper opening and above the predetermined functional space, the first connecting member is arranged above the predetermined functional space and is configured to connect the first door and the one flat belt portion of the endless belt, The machine tool is characterized in that the second connecting member is positioned above the specified functional space and is configured to connect the second door and the other flat belt portion of the endless belt.

11. It is equipped with a processing chamber where workpiece processing is performed, 11. The machine tool according to claim 10, wherein the predetermined functional space is the machining chamber.

12. a processing chamber in which workpiece processing is performed; a work setup station provided adjacent to the processing chamber, 11. The machine tool according to claim 10, wherein the predetermined functional space is a space within the setup station.

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