WO2020090353A1

WO2020090353A1 - Machine tool

Info

Publication number: WO2020090353A1
Application number: PCT/JP2019/039426
Authority: WO
Inventors: 雅浩山根; 優太野呂
Original assignee: Dmg森精機株式会社
Priority date: 2018-10-31
Filing date: 2019-10-07
Publication date: 2020-05-07
Also published as: JP2020069593A; JP6917968B2

Abstract

This machine tool comprises: a motor (41) that includes a rotary shaft extending along a central axis (101) and capable of rotating in a first direction and a second direction, and that is supported to be able to rotate around the central axis (101); a drive side pulley (31) that is connected to the rotary shaft; a belt (36) that engages with the drive side pulley (31); a door that is linked to the belt (36); a first elastic member (81) that is provided on one side of the central axis (101) and that applies a tensile force in the second direction on the motor (41); a second elastic member (86) that is provided on the other side of the central axis (101) and that applies a tensile force in the first direction on the motor (41); a revolving unit (76) that is provided integrated with the motor (41) and that can revolve around the central axis (101); and a detecting unit (91 (91A, 91B)) that detects the revolving motion of the revolving unit (76).

Description

Machine Tools

This invention relates to machine tools.

For example, Japanese Unexamined Patent Application Publication No. 2009-234708 (Patent Document 1) discloses a motor, a drive pulley rotated by the motor, a driven pulley arranged apart from the drive pulley, and a drive pulley and a driven pulley. An elevator having a closed endless cord and a door coupled to the endless cord is disclosed. When the sliding movement of the door is blocked by a predetermined force or more, the driving pulley is displaced by the pulling force of the endless rope. The elevator further includes detection means for detecting the displacement of the drive pulley.

JP, 2009-234708, A

When opening and closing the door of a machine tool using a motor, it is expected that the door that opens and closes will interfere with an obstacle such as a worker or a work. In such a situation, it is required to provide a mechanism for detecting that the door interferes with an obstacle in order to automatically stop or reverse the door. On the other hand, since various equipment such as a work transfer device is often provided around the door of the machine tool, a compact mechanism for detecting that the door interferes with an obstacle is required.

Therefore, an object of the present invention is to solve the above problems, and to provide a machine tool capable of compactly configuring a mechanism for detecting that an opening / closing door interferes with an obstacle.

A machine tool according to the present invention includes a rotary shaft that extends along a predetermined axis and is rotatable in a first direction and a second direction opposite to the first direction, and is rotatable about the predetermined axis. The motor supported by the rotating shaft, the rotating body connected to the rotating shaft, and rotating about a predetermined axis, and the rotation body engaging with the rotating body to receive rotation from the rotating body along the direction orthogonal to the predetermined axis. A mechanical element that causes a linear motion that moves relative to the rotating body, and is coupled to either one of the rotating body and the mechanical element, and rotates with a predetermined axis along with the rotation of the rotating shaft in the first direction and the second direction. A door that opens and closes in a direction orthogonal to and a door that is provided on one side of the predetermined axis when viewed in the predetermined axis direction and that applies a pulling force to the motor in the second direction around the predetermined axis. The first elastic member to be acted on In this case, a second elastic member that is provided on the other side of the predetermined axis and that applies a pulling force to the motor in the first direction around the predetermined axis is provided integrally with the motor, and the second elastic member is provided together with the motor. The rotating unit includes a rotating unit that is rotatable around a shaft in the first direction and the second direction, and a detecting unit that detects a rotating operation of the rotating unit.

According to the present invention, it is possible to provide a machine tool capable of compactly configuring a mechanism for detecting that an opening / closing door interferes with an obstacle.

It is a perspective view showing a machine tool in an embodiment of the invention. It is a front view which shows typically the state which a door opens in the machine tool in FIG. It is a front view which shows typically the state which a door closes in the machine tool in FIG. FIG. 4 is a perspective view showing a range surrounded by a chain double-dashed line IV in FIG. 1. FIG. 4 is a front view showing a range surrounded by a chain double-dashed line IV in FIG. 1. FIG. 4 is a perspective view of a range surrounded by a chain double-dashed line IV in FIG. 1 as viewed from the rear. It is a front view which shows the rotation operation of a motor (rotation part) when the door which closes interferes with an obstacle. It is a front view which shows the rotation operation of a motor (rotation part) when the door which carries out an opening operation interferes with an obstacle.

Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are designated by the same reference numerals.

FIG. 1 is a perspective view showing a machine tool according to an embodiment of the present invention. Referring to FIG. 1, machine tool 10 in the present embodiment is an NC (Numerically Control) machine tool in which various operations for machining a workpiece are automated by numerical control by a computer.

The machine tool 10 processes a work in the processing area 18. The machine tool 10 is a lathe. The machining area 18 is provided with a headstock for rotating the work, a tool rest for fixing the tool, and the like.

The machine tool 10 includes a cover body 12, a door 21, a drive side pulley 31 and a driven side pulley 32, a belt 36, a motor 41, and a control device 200.

The cover body 12, which is also called a splash guard, forms the appearance of the machine tool 10 and defines a machining area 18. The cover body 12 has a rectangular parallelepiped shape as a whole. The cover body 12 has a front portion 13 and a ceiling portion 14. An opening 16 is provided in the cover body 12. The opening 16 opens from the front portion 13 of the cover body 12 to the ceiling portion 14 and is provided over a predetermined range along the horizontal direction (Z-axis direction).

The door 21 is provided in the opening 16. The door 21 has a front portion 22 and an upper portion 23. The door 21 has a bent shape between the front portion 22 and the upper portion 23. The front portion 22 faces the front portion 13 of the cover body 12. The front portion 22 is provided with a transparent window 24 through which a worker can look into the processing area 18. The upper portion 23 faces the ceiling portion 14 of the cover body 12.

The door 21 is provided slidably along the horizontal direction (Z-axis direction). When the door 21 slides, the opening 16 is opened or closed. When the opening 16 is closed, the door 21 defines the processing area 18 together with the cover body 12.

The operation of the door 21 when the opening area of the opening 16 increases is called "opening operation". The operation of the door 21 when the opening area of the opening 16 decreases is referred to as “closing operation”.

FIG. 2 is a front view schematically showing a state in which the door is opened in the machine tool shown in FIG. FIG. 3 is a front view schematically showing a state where the door is closed in the machine tool shown in FIG.

With reference to FIGS. 1 to 3, the drive side pulley 31 and the driven side pulley 32 are provided apart from each other. The drive pulley 31 and the driven pulley 32 are provided so as to be separated from each other in the horizontal direction (Z-axis direction). The drive side pulley 31 and the driven side pulley 32 are provided apart from each other in the sliding direction of the door 21.

The drive pulley 31 is rotatably provided around the central shaft 101. The driven pulley 32 is provided rotatably around the central shaft 106. The central axis 101 and the central axis 106 extend in the horizontal direction. The central shaft 101 and the central shaft 106 extend in a direction orthogonal to the sliding direction of the door 21.

The drive pulley 31 and the driven pulley 32 are supported by the cover body 12. The drive pulley 31 and the driven pulley 32 are provided on the ceiling portion 14 of the cover body 12.

The belt 36 is engaged with the driving pulley 31 and the driven pulley 32. The belt 36 is stretched between the drive side pulley 31 and the driven side pulley 32. The belt 36 is an annular endless belt that circulates between the driving pulley 31 and the driven pulley 32.

The belt 36 has a lower straight line section 36p, an upper straight line section 36q, a drive side engagement section 36r, and a driven side engagement section 36s on the circulation path. The lower straight line section 36p and the upper straight line section 36q are linearly extending sections along the horizontal direction between the drive side pulley 31 and the driven side pulley 32. The lower straight line section 36p is located above the upper straight line section 36q.

The drive side engagement section 36r is a section extending in an arc shape (semicircle shape) around the central axis 101. The drive side engagement section 36r is provided between the lower straight section 36p and the upper straight section 36q. The belt 36 is engaged with the drive pulley 31 in the drive engagement section 36r. The driven side engagement section 36s is a section extending in an arc shape (semicircular shape) about the central axis 106. The driven side engagement section 36s is provided between the upper straight section 36q and the lower straight section 36p. The belt 36 is engaged with the driven pulley 32 in the driven side engagement section 36s.

The door 21 is connected to the belt 36. The door 21 is connected to the belt 36 in the lower straight section 36p. The door 21 is connected to the belt 36 via a connecting member 26 provided on the upper portion 23 of the door 21.

The door 21 may be connected to the belt 36 in the upper straight section 36q. It is also possible to realize a double door structure by connecting the two doors to the belt 36 in the upper straight section 36q and the lower straight section 36p, respectively.

The motor 41 is provided on the ceiling portion 14 of the cover body 12. The motor 41 has a rotating shaft 42. The rotary shaft 42 extends along the central axis 101. The rotating shaft 42 has a first direction (direction indicated by an arrow 110A in FIG. 2) and a second direction (direction indicated by an arrow 110B in FIG. 3) opposite to the first direction with the central axis 101 as a center. ) And can be rotated.

The rotary shaft 42 is a shaft member that outputs rotary motion. The motor 41 is a servo motor capable of arbitrarily controlling the rotation direction and rotation speed (acceleration) of the rotary shaft 42. The motor 41 may include a reduction gear, and in this case, the rotation reduced by the reduction gear is output from the rotation shaft 42.

The drive pulley 31 is connected to the rotary shaft 42. The drive-side pulley 31 rotates (rotates) about the central axis 101 together with the rotary shaft 42.

The control device 200 controls the machine tool 10. The control device 200 is a control panel mounted on the machine tool 10 and for controlling various operations in the machine tool 10. The control device 200 controls the motor 41.

As shown in FIG. 2, when the door 21 is closed, the control device 200 rotates the rotary shaft 42 of the motor 41 in the first direction (the direction indicated by the arrow 110A). When the drive-side pulley 31 rotates in the first direction (the direction indicated by the arrow 110A) together with the rotation shaft 42, the belt 36 receives the rotation from the drive-side pulley 31 so that the drive-side pulley 31 and the driven-side pulley 32 can rotate. Orbit counterclockwise between. At this time, the belt 36 moves in the lower straight section 36p in the direction orthogonal to the central axis 101 (the + Z axis direction indicated by the arrow 111A). As a result, the door 21 slides along the belt 36 in the lower straight section 36p in the + Z-axis direction shown by the arrow 112A.

As shown in FIG. 3, when opening the door 21, the control device 200 rotates the rotary shaft 42 of the motor 41 in the second direction (the direction indicated by the arrow 110B). When the drive pulley 31 rotates in the second direction (the direction indicated by the arrow 110B) together with the rotation shaft 42, the belt 36 receives the rotation from the drive pulley 31 to cause the drive pulley 31 and the driven pulley 32 to rotate. Orbit in a clockwise direction between. At this time, the belt 36 moves in the lower straight section 36p in the direction orthogonal to the central axis 101 (the −Z axis direction indicated by the arrow 111B). As a result, the door 21 slides along the belt 36 in the lower straight section 36p in the −Z axis direction shown by the arrow 112B.

Next, a mechanism for detecting that the door 21 that opens and closes interferes with an obstacle such as a worker or a work will be described.

FIG. 4 is a perspective view showing a range surrounded by a two-dot chain line IV in FIG. FIG. 5 is a front view showing a range surrounded by a two-dot chain line IV in FIG. FIG. 6 is a perspective view of the area surrounded by the chain double-dashed line IV in FIG. 1 as viewed from the rear.

Referring to FIGS. 4 to 6, the motor 41 is supported rotatably around the central shaft 101.

The machine tool 10 further includes an intermediate bracket 71, an intermediate plate 61, and a support angle 51. The motor 41 is rotatably supported by a support angle 51 via an intermediate bracket 71 and an intermediate plate 61.

The intermediate bracket 71 is fixed to the motor 41. The intermediate bracket 71 is fastened to the motor 41 with bolts. The intermediate bracket 71 is provided between the motor 41 and the support angle 51 in the axial direction of the central shaft 101.

The intermediate bracket 71 has a side plate portion 75, an upper plate portion 72, and a pair of

arm portions

73 and 74. The side plate portion 75 has a plate shape parallel to a plane orthogonal to the central axis 101. The side plate portion 75 is fixed to the motor 41. The side plate portion 75 is provided with a hole penetrating in the thickness direction thereof, and the rotary shaft 42 of the motor 41 (see FIGS. 2 and 3) projects through the hole.

The upper plate portion 72 has a plate shape parallel to the central axis 101. The upper plate portion 72 is provided at a position bent from the upper end of the side plate portion 75. Below the upper plate portion 72, the rotating shaft 42 and the drive pulley 31 connected to the rotating shaft 42 are arranged.

The arm portion 73 and the arm portion 74 have an arm shape extending in the Z-axis direction from the front end of the upper plate portion 72. The arm portion 73 extends from the front end of the upper plate portion 72 in the + Z axis direction. The arm portion 74 extends from the front end of the upper plate portion 72 in the −Z axis direction. The arm portion 73 and the arm portion 74 are provided symmetrically with respect to a vertical plane including the central axis 101.

The arm portion 73 and the arm portion 74 are provided at positions separated upward from the ceiling portion 14 of the cover body 12. The arm portion 73 and the arm portion 74 are provided at positions further away from the central shaft 101.

The intermediate plate 61 is fixed to the intermediate bracket 71. The intermediate plate 61 is fastened to the intermediate bracket 71 by bolts. The intermediate plate 61 is provided between the intermediate bracket 71 and the support angle 51 in the axial direction of the central shaft 101.

The intermediate plate 61 has a plate shape parallel to a plane orthogonal to the central axis 101. The intermediate plate 61 is provided at a position apart from the side plate portion 75 in the axial direction of the central shaft 101. The rotary shaft 42 and the drive pulley 31 are arranged in the space between the side plate portion 75 and the intermediate plate 61.

The intermediate plate 61 has a pair of

protrusions

63 and 64. The protrusion 63 and the protrusion 64 have a tab shape that protrudes in the axial direction of the central shaft 101. The protrusion 63 is provided at a position away from the central axis 101 in the + Z axis direction. The protruding portion 64 is provided at a position away from the central axis 101 in the −Z axis direction. The protrusion 63 and the protrusion 64 are provided symmetrically with respect to a vertical plane including the central axis 101.

The support angle 51 is fixed to the cover body 12. The support angle 51 is fastened to the ceiling portion 14 of the cover body 12 with a bolt. The support angle 51 is provided so as to project upward from the ceiling portion 14.

The support angle 51 has a pair of

protrusions

53 and 54. The protrusion 53 and the protrusion 54 have a tab shape that protrudes outward in the radial direction of the central shaft 101. The protruding portion 53 is provided at a position apart from the central axis 101 in the + Z axis direction. The protrusion 54 is provided at a position away from the central axis 101 in the −Z axis direction. The protrusion 53 and the protrusion 54 are provided symmetrically with respect to a vertical plane including the central axis 101.

The protrusion 53 is provided at a position apart from the protrusion 63 downward. The projecting portion 53 and the projecting portion 63 are arranged at intervals on a circumference centered on the central axis 101. The protrusion 54 is provided at a position apart from the protrusion 64 downward. The projecting portion 54 and the projecting portion 64 are arranged at intervals on a circumference centered on the central axis 101.

The intermediate plate 61 is connected to the support angle 51 so as to be rotatable around the central shaft 101. With such a configuration, the motor 41 is rotatably supported by the support angle 51 (the ceiling portion 14 of the cover body 12) via the intermediate bracket 71 and the intermediate plate 61.

The machine tool 10 further includes a first elastic member 81, a second elastic member 86, an angle 82 and an angle 87.

The first elastic member 81 is provided on one side sandwiching the central shaft 101 when viewed in the axial direction of the central shaft 101. The first elastic member 81 is provided at a position away from the central axis 101 in the + Z axis direction. The first elastic member 81 exerts an elastic force on the motor 41 in a second direction (a direction indicated by an arrow 110B in FIG. 3) around the central axis 101.

The first elastic member 81 is a coil spring that extends spirally around the central axis 131. One end (upper end) of the first elastic member 81 is connected to the arm portion 73. The other end (lower end) of the first elastic member 81 is connected to the cover body 12 (ceiling part 14) via the angle 82.

The second elastic member 86 is provided on the other side sandwiching the central shaft 101 when viewed in the axial direction of the central shaft 101. The second elastic member 86 is provided at a position away from the central axis 101 in the −Z axis direction. The second elastic member 86 causes the motor 41 to exert an elastic force in the first direction (the direction indicated by an arrow 110A in FIG. 2) around the central axis 101.

The second elastic member 86 is a coil spring that extends spirally around the central axis 136. One end (upper end) of the second elastic member 86 is connected to the arm portion 74. The other end (lower end) of the second elastic member 86 is connected to the cover body 12 (ceiling part 14) via the angle 87.

The first elastic member 81 and the second elastic member 86 are provided on the ceiling portion 14 of the cover body 12. The first elastic member 81 and the second elastic member 86 are provided symmetrically with respect to a vertical plane including the central axis 101. One ends (upper ends) of the first elastic member 81 and the second elastic member 86 are located above the central shaft 101, and the other ends (lower ends) of the first elastic member 81 and the second elastic member 86 are central shafts. It is located below 101. The protrusion 63 and the protrusion 53 are located between the central shaft 101 and the first elastic member 81 in the horizontal direction (Z-axis direction). The protrusion 64 and the protrusion 54 are located between the central shaft 101 and the second elastic member 86 in the horizontal direction (Z-axis direction).

With such a configuration, the motor 41 is elastically supported around the center axis 101 around a neutral position where the pulling force of the first elastic member 81 and the pulling force of the second elastic member 86 balance. There is. As shown in FIGS. 4 and 5, when the motor 41 is in the neutral position where the pulling force of the first elastic member 81 and the pulling force of the second elastic member 86 are balanced, the first elastic member 81 is The shaft 131 is provided so as to extend along the vertical direction, and the second elastic member 86 is provided so that the central shaft 136 extends along the vertical direction.

The machine tool 10 further includes a rotating unit 76, a detecting unit 91 (91A, 91B), and an angle 90.

The rotating part 76 is provided integrally with the motor 41. The rotating portion 76 is rotatable with the motor 41 in the first direction and the second direction about the central shaft 101.

In the present embodiment, the rotating portion 76 is provided as a part of the intermediate bracket 71 (side plate portion 75). The rotating portion 76 has a shape that bulges in the horizontal direction toward the outside in the radial direction of the central shaft 101. The rotating portion 76 is provided at a position away from the central shaft 101 in the + Z axis direction. The rotating portion 76 has a shape that bulges outward from the peripheral edge of the side plate portion 75 in the radial direction of the central shaft 101 toward the outer side in the radial direction of the central shaft 101. The rotating portion 76 is provided so as to overlap at least a part of the first elastic member 81 when viewed in the axial direction of the central shaft 101.

The detection unit 91 (91A, 91B) detects the rotation operation of the rotation unit 76. The detection unit 91 is a limit switch.

The detection unit 91 is attached to the cover body 12 (ceiling part 14) via the angle 90. The detection unit 91 is provided on the opposite side of the motor 41 with the rotating unit 76 interposed therebetween when viewed in the axial direction of the central shaft 101. The motor 41, the rotation unit 76, and the detection unit 91 are arranged side by side in the horizontal direction. The detection unit 91A and the detection unit 91B are provided side by side vertically. The

detection units

91A and 91B are provided above the ceiling portion 14 of the cover body 12 and below the upper plate portion 72 of the intermediate bracket 71.

The detection unit 91 has an actuator unit 92. The rotation operation of the rotation unit 76 is input to the actuator unit 92. In the present embodiment, the actuator portion 92 is a swingable hinge lever. The actuator section 92 of the detection section 91A is in contact with the rotating section 76 from above. The actuator section 92 of the detection section 91B is in contact with the rotating section 76 from below.

FIG. 7 is a front view showing the rotating operation of the motor (rotating portion) when the closing door interferes with an obstacle. FIG. 8 is a front view showing the rotating operation of the motor (rotating portion) when the door that opens is interfering with an obstacle.

With reference to FIGS. 2, 6 and 7, the door 21 is closed when the door 21 is closed, that is, when the rotary shaft 42 is rotating in the first direction (the direction shown by an arrow 110A shown in FIG. 2). When an object interferes with an obstacle, the motor 41 resists the pulling force of the second elastic member 86 in the second direction (in FIG. 2) by the reaction force (the force shown by the white arrow 120A in FIG. 2) caused by the interference. In the direction indicated by the white arrow 121A).

At this time, the rotating portion 76 rotates together with the motor 41 in the direction indicated by the arrow 123A in FIG. The rotating operation of the rotating section 76 is detected by the rotating rotating section 76 pressing the actuator section 92 of the detecting section 91B. By the protrusion 63 coming into contact with the protrusion 53, the rotation operation of the rotating portion 76 above a certain level is restricted.

Referring to FIGS. 3, 6 and 8, when door 21 is opened, that is, when rotation shaft 42 is rotating in the second direction (the direction shown by arrow 110B in FIG. 3), door 21 is opened. When it interferes with the obstacle, the reaction force (the force shown by the white arrow 120B in FIG. 3) generated by the interference causes the motor 41 to resist the pulling force of the first elastic member 81 in the first direction (in FIG. 3). It rotates in the direction indicated by the white arrow 121B).

At this time, the rotating portion 76 rotates together with the motor 41 in the direction indicated by the arrow 123B in FIG. The rotating operation of the rotating unit 76 is detected by the rotating rotating unit 76 pressing the actuator unit 92 of the detection unit 91A. By the protrusion 64 coming into contact with the protrusion 54, the rotation operation of the rotation unit 76 above a certain level is restricted.

The control device 200 controls the motor 41 so that the rotation shaft 42 stops or rotates in the reverse direction when the detection unit 91 (91A, 91B) detects the rotation operation of the rotation unit 76. This can eliminate the state where the door 21 interferes with the obstacle.

As shown in FIG. 4, in the machine tool 10 according to the present embodiment, one of the first elastic member 81 and the second elastic member 86 that elastically supports the motor 41 sandwiches the central shaft 101. Since it is provided on one side and the other side, the first elastic member 81 and the second elastic member 86 can be collectively provided around the center axis 101. As a result, the mechanism that detects that the door 21 that opens and closes interferes with an obstacle can be made compact.

Further, the motor 41 is provided such that the central axis 101, which is the rotation center of the rotary shaft 42, extends in the horizontal direction. With such a configuration, the size of the machine tool 10 in the height direction can be suppressed to be small.

Further, the detection unit 91 is provided on the opposite side of the motor 41 with the rotating unit 76 interposed therebetween when viewed in the axial direction of the central shaft 101. With such a configuration, the motor 41, the rotating unit 76, and the detecting unit 91 are provided side by side in the horizontal direction, so that the size of the machine tool 10 in the height direction can be suppressed to be small.

Further, when the motor 41 is in the neutral position where the pulling force of the first elastic member 81 and the pulling force of the second elastic member 86 are in balance, the first elastic member 81 has the central axis 131 extending in the vertical direction. The second elastic member 86 is provided in a posture in which the central axis 136 extends along the vertical direction. With such a configuration, the first elastic member 81 and the second elastic member 86 can be compactly arranged in the space around the central axis 101.

The structure of the machine tool 10 according to the embodiment of the present invention described above will be collectively described. The machine tool 10 according to the present embodiment extends along the central axis 101 as a predetermined axis and extends in the first direction. A motor 41 including a rotating shaft 42 rotatable in a second direction opposite to the first direction and rotatably supported about a central shaft 101, and a motor 41 connected to the rotating shaft 42 to connect the central shaft 101 to the central shaft 101. The drive pulley 31 as a rotating body that rotates around the center and the drive pulley 31 are engaged with and receive rotation from the drive pulley 31, so that the drive pulley 31 moves along the direction orthogonal to the central axis 101. The belt 36, which is a mechanical element that causes a linear movement that relatively moves with respect to the drive side pulley 31, and the belt 36 that is one of the belts 36, is connected to the first direction. And the door 21 that opens and closes along the direction orthogonal to the central axis 101 with the rotation of the rotary shaft 42 in the second direction, and one of the door 21 sandwiching the central axis 101 when viewed in the axial direction of the central axis 101. The first elastic member 81 provided on the side and exerting a pulling force on the motor 41 in the second direction around the axis of the central shaft 101, and the central shaft 101 when viewed in the axial direction of the central shaft 101. A second elastic member 86 that is provided on the other side sandwiched and that applies a pulling force to the motor 41 in the first direction around the axis of the central shaft 101, is provided integrally with the motor 41, and together with the motor 41 The rotary unit 76 is rotatable about the central shaft 101 in the first direction and the second direction, and the detection unit 91 (91A, 91B) for detecting the rotary motion of the rotary unit 76.

According to the machine tool 10 according to the embodiment of the present invention configured as described above, the mechanism that detects that the door 21 that opens and closes interferes with an obstacle can be configured compactly.

The rotating body and the mechanical element in the present invention are not limited to the combination of the pulley and the belt described above, and may be, for example, a combination of a pinion and a rack. Further, the door in the present invention may be connected to the rotating body. In this case, for example, the motor and the pinion connected to the rotating shaft of the motor are mounted on the door, and the rack that engages with the pinion may be provided on the cover body.

The machine tool to which the present invention is applied is not limited to a lathe. For example, a machining center, a multi-tasking machine that has a turning function that uses a fixed tool and a milling function that uses a rotating tool, or a processing machine that can perform subtractive machining and additive machining. The present invention may be applied to.

In the following, the configuration and operational effects of the present invention will be collectively described.
A machine tool according to the present invention includes a rotary shaft that extends along a predetermined axis and is rotatable in a first direction and a second direction opposite to the first direction, and is rotatable about the predetermined axis. The motor supported by the rotating shaft, the rotating body connected to the rotating shaft, and rotating about a predetermined axis, and the rotation body engaging with the rotating body to receive rotation from the rotating body along the direction orthogonal to the predetermined axis. A mechanical element that causes a linear motion that moves relative to the rotating body, and is coupled to either one of the rotating body and the mechanical element, and rotates with a predetermined axis along with the rotation of the rotating shaft in the first direction and the second direction. A door that opens and closes in a direction orthogonal to and a door that is provided on one side of the predetermined axis when viewed in the predetermined axis direction and that applies a pulling force to the motor in the second direction around the predetermined axis. The first elastic member to be acted on and seen in the predetermined axial direction And a second elastic member that is provided on the other side of the predetermined axis and that applies a pulling force to the motor in the first direction around the predetermined axis. The rotating unit includes a rotating unit that is rotatable around a shaft in the first direction and the second direction, and a detecting unit that detects a rotating operation of the rotating unit.

According to the machine tool configured as described above, the motor is elastically supported around the predetermined axis around the neutral position where the pulling force of the first elastic member and the pulling force of the second elastic member are balanced. Has been done. When the door interferes with the obstacle while the rotating shaft rotates in the first direction, the reaction force generated by the interference causes the motor to rotate in the second direction while resisting the pulling force of the second elastic member. Further, when the door interferes with the obstacle while the rotating shaft rotates in the second direction, the reaction force generated by the interference causes the motor to rotate in the first direction while resisting the tensile force of the first elastic member. .. In these cases, it is possible to detect that the door that opens and closes interferes with the obstacle by the detection unit detecting the rotation operation of the rotation unit provided integrally with the motor.

At this time, since the first elastic member and the second elastic member that elastically support the motor are provided on one side and the other side sandwiching the predetermined shaft, respectively, the first elastic member and the second elastic member are It can be collectively provided around a predetermined axis. As a result, the mechanism that detects that the door that opens and closes interferes with the obstacle can be made compact.

Preferably, the detection unit further includes a control device that controls the motor so that the rotation shaft stops or rotates in the reverse direction when the rotation operation of the rotation unit is detected.

According to the machine tool configured in this way, it is possible to eliminate the state where the door that opens and closes and the obstacle interfere with each other.

Also, preferably, the motor is provided with a predetermined axis extending in the horizontal direction. According to the machine tool configured as described above, the size of the machine tool in the height direction can be suppressed to be small.

Also, preferably, the rotating portion has a shape that swells in the horizontal direction toward the outer side in the radial direction of the predetermined axis. The detection unit is provided on the opposite side of the motor with the rotating unit interposed therebetween when viewed in the predetermined axis direction.

According to the machine tool configured as described above, the motor, the rotating part, and the detecting part are arranged side by side in the horizontal direction, so that the size of the machine tool in the height direction can be suppressed to be small.

Also preferably, the first elastic member and the second elastic member are coil springs. When the motor is in the neutral position where the pulling force of the first elastic member and the pulling force of the second elastic member are in balance, the first elastic member and the second elastic member have the central axes of the coil springs along the vertical direction. The posture is extended.

According to the machine tool configured in this way, the first elastic member and the second elastic member can be arranged more compactly in the space around the predetermined axis.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the scope of the claims, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

This invention is applied to machine tools.

10 machine tools, 12 cover body, 13, 22 front part, 14 ceiling part, 16 opening part, 18 processing area, 21 door, 23 upper part, 24 transparent window, 26 connecting member, 31 drive side pulley, 32 driven side pulley, 36 belt, 36p lower linear section, 36q upper linear section, 36r drive side engaging section, 36s driven side engaging section, 41 motor, 42 rotating shaft, 51 supporting angle, 53, 54, 63, 64 protruding part, 61 middle Plate, 71 intermediate bracket, 72 upper plate part, 73, 74 arm part, 75 side plate part, 76 rotating part, 81 first elastic member, 82, 87, 90 angle, 86 second elastic member, 91, 91A, 91B Detection unit, 92 actuator unit, 101, 106, 131, 136 central axis.

Claims

A motor that extends along a predetermined axis, includes a rotary shaft that is rotatable in a first direction and a second direction that is opposite to the first direction, and is rotatably supported about the predetermined axis;
A rotating body that is connected to the rotating shaft and rotates about the predetermined axis;
A mechanical element that engages with the rotating body and receives rotation from the rotating body to generate a linear motion that moves relative to the rotating body along a direction orthogonal to the predetermined axis,
A door that is connected to any one of the rotating body and the mechanical element and that opens and closes along a direction orthogonal to the predetermined axis in association with rotation of the rotating shaft in the first direction and the second direction;
A first elastic member that is provided on one side of the predetermined axis when viewed in the predetermined axis direction and that applies a pulling force to the motor in the second direction around the predetermined axis;
A second elastic member which is provided on the other side of the predetermined axis when viewed in the predetermined axis direction and applies a pulling force in the first direction around the predetermined axis to the motor;
A rotation unit that is provided integrally with the motor and that is rotatable with the motor in the first direction and the second direction about the predetermined axis.
A machine tool, comprising: a detection unit that detects a rotation operation of the rotation unit.
The machine tool according to claim 1, further comprising a control device that controls the motor so that the rotating shaft stops or rotates in the reverse direction when the rotating unit detects the rotating operation of the rotating unit.
The machine tool according to claim 1 or 2, wherein the motor is provided with the predetermined axis extending in a horizontal direction.
The rotating portion has a shape that swells in the horizontal direction toward the outer side in the radial direction of the predetermined axis,
The machine tool according to claim 3, wherein the detection unit is provided on the opposite side of the motor with the rotation unit interposed therebetween when viewed in the predetermined axis direction.
The first elastic member and the second elastic member are coil springs,
When the motor is in a neutral position where the pulling force of the first elastic member and the pulling force of the second elastic member are in balance, the first elastic member and the second elastic member are the central axes of the coil springs. The machine tool according to claim 3, wherein the machine tool has a posture extending along the vertical direction.