JP4139284B2 - Feeder - Google Patents

Description

  According to the present invention, the moving body is moved in a predetermined feeding direction with respect to the non-moving body, and when the moving body collides with a structure disposed on the non-moving body, the impact is reduced. It relates to a configured feeder.

  An example of a moving body that can be moved in a predetermined feeding direction with respect to a non-moving body is a tailstock. The tailstock is provided on a lathe provided with a bed, a spindle stock, a spindle, a tool post, and the like, and is arranged on the bed so as to be movable in the axial direction of the spindle and to face the spindle stock. It is comprised so that the other end side of the workpiece | work with which the one end side was hold | maintained with the main shaft may be supported.

  Further, in use, the tailstock is appropriately moved to the spindle side by the feeding device until the center held by the tailstock of the tailstock comes into contact with the center hole formed at the other end of the workpiece, The workpiece is supported with the center in contact with the center hole.

  By the way, normally, the tailstock is moved at a rapid feed speed to a position just before the center comes into contact with the work, and then moves at a slower speed than the fast feed speed to come into contact with the work. For example, when the length of the workpiece is longer than the allowable range, or the position of the tailstock for contacting the center with the center hole of the workpiece is set closer to the workpiece side than necessary. When the tailstock is moved toward the spindle (workpiece) to bring the center into contact with the workpiece, the center collides with the workpiece at a considerable speed, and this collision causes the workpiece and tailstock to move. There may be a problem that each part is damaged.

  Therefore, conventionally, a tailstock device has been proposed that can reduce the impact of the center when it collides with the workpiece during fast-forward movement and prevent damage to the workpiece and the tailstock. . As shown in FIG. 9, the tailstock device 100 supports the center 102 that can come into contact with the center hole Wa at the other end of the work W, the tailstock shaft 103 that holds the center 102, and the tailstock shaft 103. A tailstock 101 composed of a tailstock body 104, a feed device (not shown) for moving the tailstock 101 in the axial direction of the tailstock shaft 103, and the operation of the feed device (not shown). And a control device (not shown) or the like (see JP-A-6-320303).

  The tailstock shaft 103 is disposed coaxially with the axis of the main shaft, and has one end portion 103a side having a large diameter and the other end portion 103b side having a small diameter. Further, the tailstock body 104 opens to the surface (front surface) facing the headstock, and the fitting base hole 104 into which the tailstock shaft 103 is inserted, the rear surface of the tailstock body 104 and the inside of the insertion hole 105. A first through hole 106 opened on each end face, and a second through hole 107 opened on the upper surface of the tailstock main body 104 and the inner end face of the fitting insertion hole 105, respectively. With the diameter portion 103a protruding from the front surface and the small diameter portion 103b inserted through the first through hole 106 and protruding from the rear surface, the axial direction of the tailstock shaft 103 (ie, the arrow C direction and the arrow direction) (In the direction indicated by D).

  The fitting hole 105 is fitted with a piston 108 that is externally fitted to the small-diameter portion 103 b of the tailstock shaft 103 and is provided integrally therewith. The piston 108 is movable together with the tailstock shaft 103. A hydraulic chamber 109 connected to the second through hole 107 is formed between 108 and the insertion hole 105. A supply device 110 that supplies pressure oil of a predetermined pressure is connected to the second through hole 107 via a hydraulic circuit 111.

  A detected member 112 is attached to the tip of the tailstock shaft small diameter portion 103b, and a detection member (limit switch) 113 is attached to an appropriate position of the tailstock main body 104. 113 is configured to output a detection signal to a control device (not shown) when it comes into contact with the member to be detected 112.

  When the control device (not shown) operates the feed device (not shown) to move the tailstock 101, and receives the detection signal from the detection member 113 while the tailstock 101 is moving, Then, after the operation of the feeding device (not shown) is stopped to stop the movement of the tailstock 101, the supply device 110 is operated to supply the pressure oil into the hydraulic chamber 109.

  In this tailstock device 100, under the control of the control device (not shown), the tailstock 101 is moved on the bed toward the main shaft (work W) by the feeding device (not shown), and FIG. As shown in (b), when the center 102 comes into contact with the center hole Wa of the workpiece W, the tailstock shaft 103, the piston 108, and the detected member 112 are relative to the tailstock body 104 in the direction indicated by the arrow D. After that, when the detection member 113 detects the contact of the detected member 112, a detection signal is output to a control device (not shown).

  Initially, as shown in FIG. 9A, the tailstock 103, the piston 108, and the detected member 112 are separated from the detecting member 113 by a predetermined amount in the direction indicated by the arrow C with respect to the detecting member 113. The pressure oil is not supplied into the hydraulic chamber 109 from the supply device 110, and the tailstock shaft 103 and the piston 108 can move in the insertion hole 105 in the direction indicated by the arrow D. It is in a state.

  Next, when a detection signal from the detection member 113 is received by a control device (not shown), the control device (not shown) stops the operation of the feeding device (not shown) and the tailstock The movement of 101 is stopped, and then the supply device 110 is operated, and pressure oil is supplied from the supply device 110 into the hydraulic chamber 109 via the hydraulic circuit 111 and the second through hole 107. Then, the piston 108 is pressed in the direction indicated by the arrow C by the pressure oil supplied into the hydraulic chamber 109, and the center 102 is pressed against the center hole Wa with a predetermined load, whereby one end side is held by the main shaft. The other end side of the workpiece W is supported by the tailstock 101.

  In this way, when the center 102 abuts against the workpiece W, the tailstock 103 moves in the axial direction thereof. Therefore, when the tailstock 101 is fast-forwarded, the tailstock 101 (center 102) ) And the workpiece W collide, the impact of the collision is mitigated by the movement of the tailstock shaft 103 in the axial direction, thereby preventing damage to the workpiece W and each part of the tailstock device 100.

JP-A-6-320303

  However, like the above-described tailstock device 100, the tailstock shaft 103 can be freely moved in the axial direction in order to reduce the impact when the center 102 and the workpiece W collide when the tailstock 101 is fast-forwarded. The tailstock shaft 103 has moved relative to the tailstock body 104 so that the tailstock 103 does not collide with the tailstock body 104 by moving to the limit of its travel stroke (center 102). And the workpiece W must be detected by the detected member 112 and the detection member 113, and in order to press the center 102 against the workpiece W, the hydraulic circuit 111, the second Pressure oil must be supplied to the hydraulic chamber 109 through the through-hole 107 to press the piston 108, and the problem that the structure of the tailstock device 100 becomes complicated and the manufacturing cost is high. There is a problem becomes.

  Therefore, it is advantageous if the impact when the center 102 and the workpiece W collide can be reduced not on the tailstock 101 side which is a moving body but on the side of a feeding device (not shown) which moves the moving body. It is.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a feeding device that can alleviate an impact when a moving body collides with a structure disposed on a non-moving body. To do.

To achieve the above object, the present invention provides a feeding device that moves a moving body in a predetermined feeding direction relative to a non-moving body.
A ball screw provided with an axis along the predetermined feed direction, and a first screw and a non-moving member, respectively, and one end side and the other end side of the ball screw are rotatably supported around the axis line A second support device, a nut screwed to the ball screw and disposed on the movable body, a drive motor for rotating the ball screw about its axis, and a control device for controlling the operation of the drive motor; With
When the moving body that moves in the one end direction of the ball screw collides with a structure disposed on the non-moving body by rotating the ball screw about its axis by the drive motor. A feeder configured to mitigate the impact,
The first support device includes :
Together with the inner portion is hollow forming a housing that penetrates the one end face from the hollow portion, parallel to the through-hole and the axis of the ball screw is formed, it is fixed to the non-mobile,
The ball screw, which is inserted into the housing, is provided so as to be movable in a direction parallel to the axis of the ball screw and non-rotating with respect to the housing , and penetrates from one end side to the other end side. A first piston formed with a holding hole parallel to the axis of
A bearing that is inserted into the through hole and rotatably supports one end side of the ball screw provided in the housing, and is held in the holding hole;
E Bei and a biasing means for biasing said first piston at one end of said ball screw,
The first piston is configured to be restricted from moving in one end direction of the ball screw,
The second support device relates to a feeding device configured to support the other end side of the ball screw so as to be movable in the axial direction thereof.

  According to the present invention, when the drive motor is driven by the control device, the ball screw rotates about the axis thereof, and the nut that is screwed with the ball screw moves along the ball screw. The moving body is moved in a predetermined feeding direction (a direction along the axis of the ball screw). At this time, the ball screw is urged to one end side of the ball screw by the urging means via the first piston, and one end side and the other end side thereof are supported by the respective support devices.

  By the way, in the screwed relationship between the nut on the moving body side and the ball screw on the non-moving body side, when the ball screw rotates in a predetermined direction, the nut moves in one direction with respect to the ball screw. When a ball screw is provided on the body side and a nut is provided on the non-moving body side (that is, when the ball screw itself moves relative to the nut), the ball screw is moved in the predetermined direction. When rotating, the ball screw moves in the direction toward the other end with respect to the nut.

  Therefore, when the moving body (nut) that moves in the one end direction of the ball screw collides with the structure on the non-moving body and the movement of the nut stops, the movement of the nut stops and the fixed state is assumed. A force that the ball screw itself moves in the other end direction acts between the nut that can be regarded and the rotating ball screw due to the screwing relationship.

  When the force, that is, the thrust of the drive motor is larger than the biasing force of the biasing means, the ball screw moves in the other end direction against the biasing force of the biasing means via the first piston. After that, when the urging force of the urging means is increased by the movement of the ball screw (first piston) and becomes larger than the thrust of the drive motor, or the movement stroke of the first piston is set to a predetermined value. When the value is reached, the ball screw stops moving, i.e. the ball screw stops rotating.

  On the other hand, when the thrust of the drive motor is smaller than the urging force of the urging means, the rotation of the ball screw is stopped simultaneously with the movement of the nut.

  The biasing force of the biasing means is such that the ball screw can move in the other direction only when the moving body collides with the structure on the non-moving body at a predetermined speed or higher. It is adjusted appropriately.

  Thus, according to the feeding device according to the present invention, when the moving body collides with the structure, the ball screw moves against the urging force of the urging means. This can prevent the moving body and each part of the structure from being damaged, or the ball screw, the nut and the drive motor from being subjected to an abrupt load to damage them. Can do.

Further, the present invention provides a feeding device that moves a moving body in a predetermined feeding direction relative to a non-moving body.
A ball screw provided with an axis along the predetermined feed direction, and a first screw and a non-moving member, respectively, and one end side and the other end side of the ball screw are rotatably supported around the axis line A second support device, a nut screwed to the ball screw and disposed on the movable body, a drive motor for rotating the ball screw about its axis, and a control device for controlling the operation of the drive motor; With
When the moving body moving in the direction of the other end of the ball screw collides with a structure disposed on the non-moving body by rotating the ball screw about its axis by the drive motor. A feeder configured to mitigate the impact,
The first support device includes :
Together with the inner portion is hollow forming a housing that penetrates the one end face from the hollow portion, parallel to the through-hole and the axis of the ball screw is formed, it is fixed to the non-mobile,
The ball screw, which is inserted into the housing, is provided so as to be movable in a direction parallel to the axis of the ball screw and non-rotating with respect to the housing , and penetrates from one end side to the other end side. A first piston formed with a holding hole parallel to the axis of
A bearing that is inserted into the through hole and rotatably supports one end side of the ball screw provided in the housing, and is held in the holding hole;
E Bei and biasing means for biasing the first piston to the other end of said ball screw,
The first piston is configured to be restricted from moving in the direction of the other end of the ball screw,
The second support device relates to a feeding device configured to support the other end side of the ball screw so as to be movable in the axial direction thereof.

  According to the present invention, as described above, when the drive motor is driven by the control device, the ball screw rotates and the nut moves along this, so that the moving body moves relative to the non-moving body. And moved in a predetermined feeding direction. At this time, the ball screw is urged toward the other end by the urging means, and each end thereof is supported by each support device.

  In the screwing relationship between the nut on the moving body side and the ball screw on the non-moving body side, when the ball screw rotates in a predetermined direction, the nut moves in the other end direction with respect to the ball screw. When the ball screw is provided on the moving body side and the nut is provided on the non-moving body side, when the ball screw rotates in the predetermined direction, the ball screw moves in the one end direction with respect to the nut.

  Therefore, when the moving body (nut) that moves in the other end direction of the ball screw collides with the structure and the movement of the nut stops, due to the screwed relationship between the nut that has stopped moving and the rotating ball screw, A force that moves the ball screw in the one end direction acts on the ball screw.

  When the force (thrust of the drive motor) is larger than the urging force of the urging means, the ball screw moves in the one end direction against the urging force of the urging means, and then the ball screw On the other hand, when the thrust of the drive motor is smaller than the biasing force of the biasing means, the rotation of the ball screw stops simultaneously with the stop of the movement of the nut.

  Similarly to the above, the urging force of the urging means is such that the ball screw moves in the one end direction only when the moving body collides with the structure on the non-moving body at a predetermined speed or higher. It is adjusted appropriately so that it becomes possible.

  Thus, even with the feeding device according to the present invention, when the moving body collides with the structure, the ball screw moves against the urging force of the urging means. Played.

Further, the present invention provides a feeding device that moves a moving body in a predetermined feeding direction relative to a non-moving body.
First and second ball screws each having an axial line provided along the predetermined feed direction and the movable body, and one end side and the other end side of the ball screw rotatably supported about the axis line. 2 a support device, a nut screwed to the ball screw and disposed on the non-moving body, a drive motor that rotates the ball screw about its axis, and a control device that controls the operation of the drive motor; With
When the moving body that moves in the one end direction of the ball screw collides with a structure disposed on the non-moving body by rotating the ball screw about its axis by the drive motor. A feeder configured to mitigate the impact,
The first support device includes :
Together with the inner portion is hollow forming a housing that penetrates the one end face from the hollow portion, parallel to the through-hole and the axis of the ball screw is formed, it is fixed to the movable body,
The ball screw, which is inserted into the housing, is provided so as to be movable in a direction parallel to the axis of the ball screw and non-rotating with respect to the housing , and penetrates from one end side to the other end side. A first piston formed with a holding hole parallel to the axis of
A bearing that is inserted into the through hole and rotatably supports one end side of the ball screw provided in the housing, and is held in the holding hole;
E Bei and biasing means for biasing the first piston to the other end of said ball screw,
The first piston is configured to be restricted from moving in the direction of the other end of the ball screw,
The second support device relates to a feeding device configured to support the other end side of the ball screw so as to be movable in the axial direction thereof.

  According to this invention, when the drive motor is driven by the control device, the ball screw rotates about the axis thereof and moves along the one end direction of the ball screw with respect to the nut engaged therewith. Thus, the moving body is moved in the predetermined feeding direction with respect to the non-moving body. At this time, the ball screw is urged toward the other end by the urging means, and each end thereof is supported by each support device.

  When the moving body (ball screw) that moves in the one end direction of the ball screw collides with the structure on the non-moving body, the movement of the ball screw stops, but due to the screwed relationship between the nut and the ball screw, The ball screw is continuously subjected to a force that moves in the one end direction after the movement stops.

  Therefore, when the force (thrust of the drive motor) is larger than the urging force of the urging means, the ball screw moves in the one end direction against the urging force of the urging means, and then the ball screw While the rotation is stopped, when the thrust of the drive motor is smaller than the urging force of the urging means, the rotation of the ball screw is stopped when the moving body collides with the structure. Thus, the same effects as described above can be obtained by the feeding device according to the present invention.

Further, the present invention provides a feeding device that moves a moving body in a predetermined feeding direction relative to a non-moving body.
First and second ball screws each having an axial line provided along the predetermined feed direction and the movable body, and one end side and the other end side of the ball screw rotatably supported about the axis line. 2 a support device, a nut screwed to the ball screw and disposed on the non-moving body, a drive motor that rotates the ball screw about its axis, and a control device that controls the operation of the drive motor; With
When the moving body moving in the direction of the other end of the ball screw collides with a structure disposed on the non-moving body by rotating the ball screw about its axis by the drive motor. A feeder configured to mitigate the impact,
The first support device includes :
Together with the inner portion is hollow forming a housing that penetrates the one end face from the hollow portion, parallel to the through-hole and the axis of the ball screw is formed, it is fixed to the movable body,
The ball screw, which is inserted into the housing, is provided so as to be movable in a direction parallel to the axis of the ball screw and non-rotating with respect to the housing , and penetrates from one end side to the other end side. A first piston formed with a holding hole parallel to the axis of
A bearing that is inserted into the through hole and rotatably supports one end side of the ball screw provided in the housing, and is held in the holding hole;
E Bei and a biasing means for biasing said first piston at one end of said ball screw,
The first piston is configured to be restricted from moving in one end direction of the ball screw,
The second support device relates to a feeding device configured to support the other end side of the ball screw so as to be movable in the axial direction thereof.

According to the present invention, similarly to the above, the control unit, the drive motor is driven to move the nut along the other end direction the ball screw is rotated, thereby moving body non The moving body is moved in a predetermined feeding direction. At this time, each end of the ball screw is supported by each support device in a state where the ball screw is urged by the urging means on one end side thereof.

  When the moving body (ball screw) that moves in the direction of the other end of the ball screw collides with the structure on the non-moving body, the movement of the ball screw stops, but the movement of the ball screw stops. After that, the force that moves in the direction of the other end is acting.

  Therefore, when the force (thrust of the drive motor) is larger than the urging force of the urging means, the ball screw moves in the other end direction against the urging force of the urging means, and then the ball screw While the rotation is stopped, when the thrust of the drive motor is smaller than the urging force of the urging means, the rotation of the ball screw is stopped when the moving body collides with the structure. Thus, the same effects as described above can be obtained by the feeding device according to the present invention.

  The biasing means is provided in the hollow portion of the housing on the other end side of the ball screw with respect to the first piston, and a spring body that biases the first piston toward the one end side of the ball screw, or The spring may be provided in the hollow portion of the housing on one end side of the ball screw with respect to the first piston, and bias the first piston toward the other end side of the ball screw.

  The first piston has a flange formed on an outer peripheral surface thereof, and the first support device includes an inner surface of the housing and a surface of the first piston flange on the other end side of the ball screw. A first hydraulic chamber formed between the inner surface of the housing and a surface of the first piston flange on one end side of the ball screw; A cylinder formed in the housing, further comprising a first through hole that opens to an outer peripheral surface of the housing and the first hydraulic chamber, and the biasing means is a cylinder that is formed hollow and is attached to the housing A second piston that is fitted into the cylinder and is movable in the axial direction of the cylinder, a second hydraulic chamber formed between the inner surface of the cylinder and the second piston, and the second Opposite to the second hydraulic chamber across the piston Provided in the cylinder, one end of which is in contact with the second piston and urges the second piston toward the second hydraulic chamber, the cylinder is formed with an outer peripheral surface thereof and the first It may be configured by a second through hole that opens to two hydraulic chambers and communicates with the first through hole, and hydraulic oil filled in the first hydraulic chamber and the second hydraulic chamber.

  In this way, in a normal state (a state where the moving body does not collide with the structure), the second piston biased by the spring body causes the hydraulic oil in the second hydraulic chamber and the first hydraulic chamber to pass through. The first piston is pressed to one end side or the other end side of the ball screw, whereby the ball screw is supported in a state of being biased toward one of its end portions.

  Then, when the moving body collides with the structure, the ball screw (first piston) moves in the one end direction or the other end direction, the internal pressure in the first hydraulic chamber increases, and the hydraulic oil filled in this increases. The fluid flows into the second hydraulic chamber through the first through hole and the second through hole, and the second piston moves against the urging force of the spring body in the direction opposite to the second hydraulic chamber by the flowing hydraulic oil.

  Thereafter, the urging force of the spring body is increased by the movement of the second piston, and the drive is converted into the pressing force of the second piston through the first piston and the hydraulic oil in the first hydraulic chamber and the second hydraulic chamber. The movement of the ball screw (first piston) stops when the thrust of the motor becomes larger or when the movement stroke of the first piston or the second piston reaches a predetermined set value.

  This movement of the ball screw absorbs and relaxes the impact at the time of the collision, thereby damaging each part of the moving body and structure, or applying a sudden load to the ball screw, nut, and drive motor. This avoids damaging them.

  In this case, the biasing means penetrates into the hollow portion from the cylinder end surface on which the spring body is provided, and has a screw hole formed in parallel to the cylinder axis, And an abutting member which is provided so as to be movable in the axial direction thereof, and which abuts against the other end of the spring body, and a bolt which is screwed into the screw hole and whose tip is in contact with the abutting member. In this way, the biasing force of the spring body against the second piston can be easily adjusted by appropriately adjusting the screwing amount of the bolt.

  The feeding device further includes detection means for detecting a load of the drive motor, and the control device stops the drive motor when the load detected by the detection means exceeds a predetermined value. It may be configured as follows.

  In the feeding device according to the present invention, the impact when the moving body collides with the structure body can be reduced by the configuration as described above. However, even after the moving body collides with the structure body, it is usually driven. The motor is in a state where necessary power is supplied to move the moving body to a target position. For this reason, in some cases, the drive motor may be damaged by overload.

  Therefore, as described above, if the load acting on the drive motor is detected by the detection unit and the detected load exceeds a predetermined value, the drive motor is stopped. Can be effectively prevented from being damaged.

  Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view showing a schematic configuration of a feeding device and the like according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a schematic configuration of the first support device according to the present embodiment, and FIG. 3 is a cross-sectional view showing a schematic configuration of the second support device according to the present embodiment.

  As shown in FIGS. 1 to 3, the feeding device 1 of this example is configured to move a tailstock 3 of a lathe 2 in a predetermined feeding direction, and an axis is along the predetermined feeding direction. A ball screw 10 provided, a first support device 20 that rotatably supports one end side of the ball screw 10 about its axis, and a second support that rotatably supports the other end side of the ball screw 10 about its axis. A support device 40, a nut 11 that is screwed with the ball screw 10, a servo motor 12 that rotates the ball screw 10 about its axis, a control device 15 that controls the operation of the servo motor 12, and the like.

  In this example, the moving body is the tailstock 3 and the feeding device 1 that moves the tailstock 3 in a predetermined feeding direction will be described as an example. However, the present invention is not limited to this, and the present invention is not limited to this. The present invention can be applied to a feeding device that moves the movable body in a predetermined feeding direction.

  First, the lathe 2 will be described.

  In addition to the tailstock 3, the lathe 2 includes a bed 4, a spindle base 5 disposed on the bed 4, a spindle 7 supported rotatably by the spindle base 5 and holding a chuck 6, a tool A tool post (not shown), etc. (not shown) that holds (not shown) and is movable in a predetermined feeding direction are provided. The chuck 6 grips one end side of the workpiece W, and a center hole is appropriately formed in the other end surface of the workpiece W.

  The tailstock 3 is disposed on the bed 4 so as to face the headstock 5, and is provided coaxially with the center 3a that can come into contact with the center hole of the workpiece W and the axis of the main shaft 7. A center shaft 3b for holding the center 3a is provided, and the center 3a and the tail shaft 3b are supported so that the center 3a protrudes from the surface facing the head stock 5 toward the head stock 5 side.

  The bed 4 is provided with a guide rail 8 along the axial direction of the main shaft 7. The tailstock 3 engages with the guide rail 8 and is movable along the slider 3c. Is fixed, and the tailstock 3 is guided by the guide rail 8 and the slider 3c so as to approach or move away from the other end side of the workpiece W held at one end side by the chuck 6 of the main shaft 7. Move on the bed 4.

  Next, the feeding device 1 will be described.

  As described above, the feeding device 1 includes the ball screw 10, the first support device 20, the second support device 40, the nut 11, the servo motor 12, the control device 15, and the like. An axis is provided in parallel with the axis of the main shaft 7, the first support device 20 and the second support device 40 are disposed on the bed 4 via mounting members 18 and 19, and the nut 11 is a tailstock 3 is attached to a mounting portion 3d erected on the lower surface of 3.

  The first support device 20 is open at one end surface and formed hollow inside, and has a through-hole 21a through which the ball screw 10 is inserted from the hollow portion to the other end surface. , A housing 21 fixed on the bed 4 through the side, a holding hole 22a through which the ball screw 10 is inserted from one end side to the other end side, and a flange formed on the outer peripheral surface on the one end side 22b, which is inserted into the housing 21 and is movable in directions parallel to the axis of the ball screw 10 (in the direction of arrow A, which is one end direction of the ball screw 10, and in the direction of arrow B, which is the other end direction). The first piston 22 provided in the first hole 22 and the one end side of the ball screw 10 inserted in the through hole 21a and the holding hole 22a and provided in the housing 21 are rotatably supported around the axis thereof, and the inside of the holding hole 22a Keep A bearing 23 which is composed of such a biasing mechanism 30 for biasing the first piston 22 in the arrow A direction.

  The first support device 20 is formed in the housing 21 and the first hydraulic chamber 24 formed between the inner surface of the housing 21 and the surface on the arrow B direction side of the first piston flange 22b. One end side is mounted in a first through hole 25 that opens to the outer peripheral surface and the first hydraulic chamber 24, and a mounting hole 22c formed in the other end of the first piston 22, and the other end side is from a hollow portion of the housing 21. An anti-rotation pin 26 that is movably inserted in a direction parallel to the axis of the ball screw 10 is provided in an insertion hole 21b formed through the other end surface, and the ball screw 10 is centered on the axis. The first piston 22 is configured not to rotate by the anti-rotation pin 26 when rotated.

  The bearing 23 is fixed to the ball screw 10 by a nut 27 attached to the ball screw 10, and is fixed to the first piston 22 by a fixing member 28 attached to the first piston 22. A restricting member 29 that restricts the movement of the first piston 22 in the direction of arrow A is provided at the opening of the one end surface of the housing 21.

  The urging mechanism 30 is attached to the housing 21 and has an axis that is provided in parallel with the axis of the ball screw 10 and has an interior that is hollow, and penetrates from the hollow to one end face in parallel with the axis. A cylinder 31 in which a screw hole 31a is formed, and a first cylinder that is fitted in the cylinder 31 and is movably provided in the axial direction of the cylinder 31 (arrow A direction and arrow B direction parallel to the axis of the ball screw 10). Two pistons 32, a second hydraulic chamber 33 formed between the inner surface of the other end side of the cylinder 31 and the second piston 32, and an inside of one end side of the cylinder 31 are provided so as to be movable in the axial direction thereof. Provided in the cylinder 31 between the abutting member 34, the second piston 32 and the abutting member 34, and urges the second piston 32 in the direction indicated by the arrow B, and is screwed into the screw hole 31a. Together A bolt 36 whose end is in contact with the contact member 34, and a second through hole 37 formed in the cylinder 31 that opens to the outer peripheral surface thereof and the second hydraulic chamber 33 and communicates with the first through hole 25. And hydraulic oil (not shown) filled in the first hydraulic chamber 24 and the second hydraulic chamber 33.

  The second support device 40 has an opening at the other end surface and a hollow inside, and a through hole 41a is formed through the hollow portion to the one end surface and through which the ball screw 10 is inserted. And the other end side of the ball screw 10 inserted in the through hole 41a and provided in the housing 41 so as to be rotatable about the axis thereof and in the axial direction thereof. A bearing (linear ball bearing) 42 that is supported in a freely movable manner (in the direction indicated by arrow A in the direction of one end of the ball screw 10 and in the direction indicated by arrow B in the other end) and provided in the hollow portion of the housing 41, The fixing member 43 is attached to the inner peripheral surface of the housing 41 and fixes the bearing 42 to the inner peripheral surface of the housing 41.

  A servo motor 12 is attached to the other end surface of the housing 41, and a spline 12a formed on the output shaft of the servo motor 12 and a spline 10a formed on the other end surface of the ball screw 10 have spline holes 13a. They are connected via a coupling 13. The spline 10 a on the ball screw 10 side is engaged with the spline hole 13 a of the coupling 13 so as to be movable in the axial direction of the ball screw 10.

  Thus, as shown in FIGS. 2A and 3A, the second piston 32 urged by the coil spring 35 causes the hydraulic oil in the second hydraulic chamber 33 and the first hydraulic chamber 24 to pass through. The first piston 22 is pressed in the direction indicated by the arrow A, whereby the ball screw 10 is supported by the support devices 20 and 40 while being urged in the direction indicated by the arrow A. On the other hand, as shown in FIGS. 2B and 3B, when the ball screw 10, that is, the first piston 22 moves in the direction indicated by the arrow B, the internal pressure in the first hydraulic chamber 24 increases, The hydraulic oil filled in the gas flows into the second hydraulic chamber 33 through the first through hole 25 and the second through hole 37, and the second piston 32 resists the urging force of the coil spring 35 by the flowing hydraulic oil. Move in the direction of arrow A.

  By appropriately adjusting the screwing amount of the bolt 36, the urging force of the coil spring 35 against the second piston 32 is adjusted, whereby a force of a predetermined magnitude or more is applied to the ball screw 10 (first piston 22). The first piston 22 can move in the direction indicated by the arrow B only when it acts (as will be described later, only when the tailstock 3 collides with the workpiece W at a predetermined speed or higher). .

  The control device 15 controls the operation of the servo motor 12 based on an appropriately generated NC program and the like, and includes a current supply unit 16 and a supply current detection unit 17. The current supply unit 16 supplies current to the servo motor 12 and drives it. When receiving a signal to be described later transmitted from the supply current detection unit 17, the current supply unit 16 stops supplying current to the servo motor 12. The servo motor 12 is stopped and an alarm is output, and the supply current detection unit 17 detects a current supplied from the current supply unit 16 to the servo motor 12 and exceeds a predetermined value. Sometimes, a signal indicating that is transmitted to the current supply unit 16.

  Since the current supplied to the servomotor 12 increases in accordance with the load acting on the servomotor 12, the supply current is detected and the servomotor 12 is stopped when this exceeds a predetermined value. Thus, it is possible to prevent a load exceeding a certain level from acting on the servo motor 12.

  Thus, when current is supplied from the current supply unit 16 to the servo motor 12 and the servo motor 12 is driven, the rotational power of the servo motor 12 passes through the spline 12a of the output shaft, the coupling 13 and the spline 10a of the ball screw 10. When the ball screw 10 is rotated about its axis by the transmitted rotational power of the servo motor 12, the nut 11 screwed with the ball screw 10 moves along with it. As a result, the tailstock 3 moves on the bed 4 while being guided by the guide rail 8 and the slider 3c.

  At this time, the current supplied from the current supply unit 16 to the servo motor 12 is detected at any time by the supply current detection unit 17, and it is confirmed that the detected supply current exceeds a predetermined value. When a signal indicating that is transmitted from the supply current detection unit 17 to the current supply unit 16 and received by the current supply unit 16, the supply of current to the servomotor 12 is stopped and the servomotor 12 is stopped. Is stopped and an alarm is output to inform the operator that the load on the servo motor 12 has become abnormally high.

  According to the feeding device 1 of the present example configured as described above, when the servo motor 12 is driven by the control device 15 and the ball screw 10 is rotated about its axis, the nut 11 screwed with the nut 11 is engaged. Accordingly, the tailstock 3 is guided by the guide rail 8 and the slider 3c so as to approach the other end side of the workpiece W gripped on one end side by the chuck 6 of the main shaft 7. Alternatively, it moves on the bed 4 so as to move away. At this time, the current supplied from the current supply unit 16 of the control device 15 to the servo motor 12 is detected by the supply current detection unit 17 as needed.

  When the tailstock 3 is moved to the tailstock position so as to approach the other end side of the workpiece W, the center 3a comes into contact with the center hole of the other end surface of the workpiece W and the movement of the tailstock 3 stops. The other end surface of the workpiece W is supported by the center 3a urged by the thrust of the servo motor 12.

  The moving position of the tailstock 3 that is set to bring the center 3a into contact with the workpiece W (the tailstock position) is a slight amount further from the position when the center 3a is in contact with the workpiece W. The servo motor 12 which is set to a position approaching the position and is feedback-controlled to move the tailstock 3 to this tailstock position will keep the tailstock 3 in the tailstock position even after the center 3a contacts the workpiece W. Driven to move, a predetermined thrust is continuously generated, and the workpiece W is supported by this thrust as described above.

  At this time, the thrust of the servo motor 12 is converted into a pressing force of the first piston 22 via the second piston 32 and the hydraulic oil in the second hydraulic chamber 33 and the first hydraulic chamber 24. For this reason, the first piston 22 (ball screw 10) does not move in the direction indicated by the arrow B. After the center 3a contacts the workpiece W as described above, The tailstock 3 stops its movement.

  By the way, in the screwed relationship between the nut 11 on the moving body (tailstock 3) side and the ball screw 10 on the non-moving body (bed 4) side, when the ball screw 10 rotates in a predetermined direction, the nut 11 10 moves in the direction of arrow A (direction approaching the workpiece W), but conversely, when the ball screw 10 is provided on the moving body side and the nut 11 is provided on the non-moving body side (that is, the nut 11). In the case where the ball screw 10 itself moves, the ball screw 10 moves in the arrow B direction with respect to the nut 11 when the ball screw 10 rotates in the predetermined direction.

  Therefore, when the tailstock 3 is moved at a rapid feed speed to a position before the center 3a abuts against the workpiece W, and then moved so as to abut on the workpiece W at a speed slower than the rapid feed speed. If the length of the workpiece W is longer than the allowable range, or if the tailstock position is erroneously set closer to the workpiece W side than necessary, the center 3a is At this time, when the tailstock 3 (nut 11) moving in the direction of arrow A collides with the workpiece W and the movement of the nut 11 stops, the nut 11 is collided with the workpiece W. The ball screw 10 itself moves in the direction indicated by the arrow B between the nut 11 that can be regarded as being in a fixed state due to the stop of the movement of the ball 11 and the rotating ball screw 10 due to their screwing relationship. Force to act It becomes Rukoto.

  When the force, that is, the thrust of the servo motor 12 is larger than the biasing force of the coil spring 35, the first piston 22 (ball screw 10) moves in the direction indicated by the arrow B, and the first hydraulic chamber 24 The hydraulic oil filled therein flows into the second hydraulic chamber 33 through the first through-hole 25 and the second through-hole 37, and the second piston 32 causes the coil spring 35 to flow into the second hydraulic chamber 33. It moves in the direction of arrow A against the urging force.

  Thereafter, when the biasing force of the coil spring 35 is increased by the movement of the second piston 32 and becomes larger than the thrust of the servo motor 12, or the movement stroke of the first piston 22 or the second piston 32 is set to a predetermined value. When the value is reached, the movement of the first piston 22 (ball screw 10) stops, that is, the rotation of the ball screw 10 stops.

  On the other hand, when the thrust of the servo motor 12 is smaller than the biasing force of the coil spring 35, the rotation of the ball screw 10 is stopped simultaneously with the movement of the nut 11.

  Note that an overcurrent may flow into the servomotor 12 due to the collision, and an overload state may occur. In this case, an excessive current is supplied to the servomotor 12 by the supply current detection unit 17. Is detected, the supply of current to the servo motor 12 by the current supply unit 16 is stopped, and an alarm is output from the supply current detection unit 17.

  Thus, according to the feeder according to the present invention, when the tailstock 3 collides with the workpiece W, the ball screw 10 moves against the urging force of the coil spring 35. Even if the tailstock device 100 according to the example does not have a complicated structure, the impact at the time of collision can be absorbed and alleviated, whereby the work W and the tailstock 3 It can be avoided that each part is damaged or that a sudden load is applied to the ball screw 10, the nut 11, and the servo motor 12 to damage them. Moreover, the manufacturing cost of the whole tailstock device including the feeding device 1 can be reduced.

  Further, by appropriately adjusting the screwing amount of the bolt 36, the urging force of the coil spring 35 against the second piston 32 can be easily adjusted, so that the feeding device 1 can be easily used.

  In addition, when an overcurrent flows to the servomotor 12 due to a collision, the supply of power to the servomotor 12 is stopped, so that an excessive load acts on the servomotor 12 and it is damaged. Can be prevented.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect which this invention can take is not limited to this at all.

  In the above example, the tailstock 3 moves to the workpiece W side and the impact when the tailstock 3 collides with the workpiece W is configured. However, the present invention is not limited to this. The base 3 moves away from the workpiece W, and the impact is reduced when the tailstock 3 and a peripheral device of the lathe 2 such as a loader that attaches and detaches the workpiece W collide with the chuck 6. You can also

  In this case, one end side of the ball screw 10 is configured to be supported by the first support device 50, and the first support device 50 has one end face opened and the inside formed hollow, A first member 52 having a through hole 52a that penetrates from the hollow portion to the other end surface and through which the ball screw 10 is inserted, and a flange portion 52b formed on the outer peripheral surface on the one end side, and the other end surface are open, Is formed hollow, and an insertion hole 53a penetrating from the hollow portion to one end surface is formed, and the other end surface is provided in contact with the surface on the arrow A direction side of the flange portion 52b of the first member 52. A housing 51 provided with the second member 53, a holding hole 54a that penetrates from one end side to the other end side, and through which the ball screw 10 is inserted, and a flange formed on the outer peripheral surface between the one end and the other end The first member 52 and the first member It is fitted in the hollow portion of the member 53, a first piston 54 provided movably in the arrow A direction and the arrow B direction, and the bearing 23, and the like wherein the biasing mechanism 30. The first member 52 and the second member 53 are fixed on the bed 4 via the mounting member 18.

  Further, the first support device 50 includes a first hydraulic chamber 55 formed between the inner surface of the second member 53 and the surface of the first piston flange 54b on the arrow A direction side, and the second member 53. A first through hole 56 formed on the outer peripheral surface and the first hydraulic chamber 55 and communicating with the second through hole 37 of the biasing mechanism 30 and an attachment formed at the other end of the first piston 54 One end side is attached in the hole 54c, and the other end side is movable in a direction parallel to the axis of the ball screw 10 in a fitting insertion hole 52c formed through the other end surface from the hollow portion of the first member 52. The anti-rotation pin 26 to be inserted, the nut 27, and the fixing member 28 are provided.

  According to this first support device 50, as shown in FIG. 4A, the second piston 32 biased by the coil spring 35 causes the hydraulic oil in the second hydraulic chamber 33 and the first hydraulic chamber 55 to pass through. The first piston 54 is pressed in the direction indicated by the arrow B, whereby the ball screw 10 is supported while being urged in the direction indicated by the arrow B. On the other hand, as shown in FIG. 4B, when the ball screw 10, that is, the first piston 54 moves in the direction of arrow A, the internal pressure in the first hydraulic chamber 55 increases, and the hydraulic oil filled therein Flows into the second hydraulic chamber 33 through the first through hole 56 and the second through hole 37, and the second piston 32 moves in the direction of arrow A against the urging force of the coil spring 35 by the flowing hydraulic oil. To do.

  The other end side of the ball screw 10 supported by the second support device 40 moves from the position shown in FIG. 5A to the position shown in FIG. 5B in accordance with the movement of the ball screw 10. To do. Further, the movement of the first piston 54 in the direction indicated by the arrow B is regulated by the flange portion 54 b of the first piston 54 and the flange portion 52 b of the first member 52.

  And according to the feeder provided with this 1st support apparatus 50, although the nut 11 moves to the arrow B direction when the ball screw 10 rotates to a predetermined direction (direction in which the tailstock 3 leaves | separates from the workpiece | work W). However, when the tailstock 3 collides with a loader or the like and the movement of the nut 11 stops, the nut 11 that can be regarded as being in a fixed state because the movement of the nut 11 has stopped, Due to these screwing relations, a force that moves the ball screw 10 itself in the direction indicated by the arrow A acts between the ball screw 10 that rotates in a predetermined direction.

  Therefore, when this force (the thrust of the servo motor 12) is larger than the biasing force of the coil spring 35, the first piston 54 (ball screw 10) moves in the direction indicated by the arrow A, and the inside of the first hydraulic chamber 55 The internal pressure increases, and the hydraulic oil filled therein flows into the second hydraulic chamber 33 through the first through hole 56 and the second through hole 37, and the second piston 32 of the coil spring 35 is caused by the flowing hydraulic oil. It moves in the direction of arrow A against the urging force, and this action alleviates the impact caused by the collision, damages each part such as the tailstock 3 and loader, or ball screw 10, nut 11, servo It is avoided that a sudden load acts on the motor 12 to damage them.

  Thereafter, when the biasing force of the coil spring 35 is increased by the movement of the second piston 32 and becomes larger than the thrust of the servo motor 12, or the movement stroke of the first piston 54 and the second piston 32 is set to a predetermined value. When the value is reached, the rotation of the ball screw 10 stops. On the other hand, when the thrust of the servo motor 12 is smaller than the biasing force of the coil spring 35, the rotation of the ball screw 10 is stopped simultaneously with the movement of the nut 11.

  It should be noted that the screwing amount of the bolt 36 is appropriately adjusted so that the first piston 54 can move in the direction of arrow A only when the tailstock 3 collides with the loader or the like at a predetermined speed or higher. Thus, the biasing force of the coil spring 35 against the second piston 32 is adjusted.

  Further, the first support device 20 can be configured as a first support device 60 as shown in FIG. 6, and the first support device 50 is configured as a first support device 70 as shown in FIG. be able to.

  As shown in FIG. 6, the first support device 60 includes the housing 21 and a holding hole 61 a that penetrates from one end side to the other end side and through which the ball screw 10 is inserted, and is inserted into the housing 21. The piston 61 movably provided in the direction indicated by arrow A and the direction indicated by arrow B, the bearing 23, and a mounting hole 61b formed in the other end of the piston 61 are attached at one end side and the other end side is a housing. The anti-rotation pin 26, which is movably inserted in a direction parallel to the axis of the ball screw 10, into the insertion hole 21 b formed through the other end surface from the hollow portion 21, the nut 27, The fixing member 28, the restricting member 29, a coil spring 62 provided between the inner surface of the other end side of the housing 21 and the piston 61 and biasing the piston 61 in the direction indicated by the arrow A are configured. .

  On the other hand, as shown in FIG. 7, the first support device 70 has a through hole in which one end face is opened and the inside is formed hollow, and penetrates from the hollow portion to the other end face and the ball screw 10 is inserted. A housing provided with a first member 72 formed with 72a, and a second member 73 that is open at the other end surface and formed hollow inside, and the other end surface is in contact with one end surface of the first member 72. 71 and a holding hole 74a that penetrates from one end side to the other end side and through which the ball screw 10 is inserted, is inserted into the hollow portion of the first member 72, and is in the direction indicated by arrows A and B. One end side is mounted in a mounting hole 74b formed in the piston 74, the bearing 23, and the other end of the piston 74, and the other end side penetrates from the hollow portion of the first member 72 to the other end surface. Insertion formed The rotation preventing pin 26, which is movably inserted in a direction parallel to the axis of the ball screw 10, the nut 27, the fixing member 28, the inner surface of the hollow portion of the second member 73, and the piston 74. A coil spring 75 and the like that are provided in between and urge the piston 74 in the direction indicated by arrow B.

  According to the feeding device including the first support device 60 or the first support device 70, when the tailstock 3 collides with the workpiece W, the loader, or the like, and the movement of the nut 11 stops, the movement of the nut 11 is stopped. Due to the screwed relationship between the nut 11 that can be regarded as being fixed by stopping and the ball screw 10 that rotates in a predetermined direction, the ball screw 10 itself is in the direction indicated by the arrow A or indicated by the arrow. Since a force moving in the direction B acts, when this force (the thrust of the servo motor 12) is larger than the urging force of the coil springs 62 and 75, the coil spring 62 contracts and the piston 61 is moved as shown in FIG. From the position shown in FIG. 6B, the coil spring 75 contracts and the piston 74 moves from the position shown in FIG. 7A to the position shown in FIG. 7B. In collision The impact is alleviated and each part such as the workpiece W, the tailstock 3 and the loader is damaged, or the ball screw 10, the nut 11 and the servo motor 12 are prevented from being damaged due to a sudden load. Is done.

  Thereafter, when the biasing force of the coil springs 62 and 75 is increased by the movement of the pistons 61 and 74 and becomes larger than the thrust of the servo motor 12, or the moving stroke of the pistons 61 and 74 reaches a predetermined set value. The rotation of the ball screw 10 stops. On the other hand, when the thrust of the servo motor 12 is smaller than the biasing force of the coil springs 62 and 75, the rotation of the ball screw 10 is stopped simultaneously with the movement of the nut 11.

  The biasing force of the coil springs 62 and 75 is such that the pistons 61 and 74 move in the direction indicated by the arrow A or the direction indicated by the arrow B only when the tailstock 3 collides with the workpiece W or loader at a predetermined speed or higher. It is adjusted appropriately so that it is possible.

  Further, in the above example, the ball screw 10 is arranged on the bed 4 side and the nut 11 is arranged on the tailstock 3 side to constitute the feeding device 1, but the present invention is not limited to this, as shown in FIG. The feeding device 80 may be configured by disposing the ball screw 10 on the tailstock 3 side and the nut 11 on the bed 4 side. In this case, the first support devices 20, 50, 60, and 70 that support one end side of the ball screw 10 are disposed on the bottom surface of the tailstock 3 through the attachment member 81 as appropriate, and the other end side of the ball screw 10. The second support device 40 is disposed on the bottom surface of the tailstock 3 through an attachment member 82 as appropriate, and the nut 11 is attached to an attachment portion 4 a erected on the bed 4.

  Further, when the tailstock 3 moves so as to approach the workpiece W and the impact when the tailstock 3 and the workpiece W collide with each other is reduced, one end of the ball screw 10 is caused by the first support devices 50 and 70. When the tailstock 3 is moved away from the workpiece W and the impact is reduced when the tailstock 3 collides with a loader or the like, the first support device 20 is configured. , 60 so that one end side of the ball screw 10 is supported.

  In this way, when the servo motor 12 is driven, the ball screw 10 rotates about the axis thereof, and the nut 11 that engages with the nut 11 extends along one end direction or the other end direction of the ball screw 10. Thus, the tailstock 3 moves on the bed 4 so as to approach the other end of the workpiece W or away from the other end of the workpiece W.

  Then, when the tailstock 3 (ball screw 10) moving in a predetermined direction collides with the workpiece W or a loader, the movement of the ball screw 10 is stopped, but due to the screwed relationship between the nut 11 and the ball screw 10. The ball screw 10 is continuously subjected to a force that moves in one end direction or the other end direction even after the movement is stopped.

  Therefore, when the force (the thrust of the servo motor 12) is larger than the urging force of the coil springs 35, 62, 75, the ball screw 10 has its one end against the urging force of the coil springs 35, 62, 75. After the movement in the direction or the other end direction, the rotation of the ball screw 10 is stopped, and by this action, the impact due to the collision is alleviated, and each part such as the work W, the tailstock 3 and the loader is damaged, or It is avoided that an abrupt load acts on the ball screw 10, the nut 11, and the servo motor 12 to damage them. On the other hand, when the thrust of the servo motor 12 is smaller than the urging force of the coil springs 35, 62, 75, the rotation of the ball screw 10 is stopped when the tailstock 3 collides with the workpiece W or a loader.

It is the front view which showed schematic structure, such as a feeder concerning one Embodiment of this invention. It is sectional drawing which showed schematic structure of the 1st support apparatus which concerns on this embodiment. It is sectional drawing which showed schematic structure of the 1st support apparatus which concerns on this embodiment. It is sectional drawing which showed schematic structure of the 2nd support apparatus which concerns on this embodiment. It is sectional drawing which showed schematic structure of the 2nd support apparatus which concerns on this embodiment. It is sectional drawing which showed schematic structure of the 1st support apparatus which concerns on other embodiment of this invention. It is sectional drawing which showed schematic structure of the 1st support apparatus which concerns on other embodiment of this invention. It is sectional drawing which showed schematic structure of the 2nd support apparatus which concerns on other embodiment of this invention. It is sectional drawing which showed schematic structure of the 2nd support apparatus which concerns on other embodiment of this invention. It is sectional drawing which showed schematic structure of the 1st support apparatus which concerns on other embodiment of this invention. It is sectional drawing which showed schematic structure of the 1st support apparatus which concerns on other embodiment of this invention. It is sectional drawing which showed schematic structure of the 1st support apparatus which concerns on other embodiment of this invention. It is sectional drawing which showed schematic structure of the 1st support apparatus which concerns on other embodiment of this invention. It is the front view which showed schematic structure, such as a feeder concerning other embodiment of this invention. It is sectional drawing which showed the one part schematic structure of the tailstock which concerns on a prior art example. It is sectional drawing which showed the one part schematic structure of the tailstock which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Feeder 2 Lathe 3 Tailstock 10 Ball screw 11 Nut 12 Servo motor 15 Control device 16 Current supply part 17 Supply current detection part 20 1st support apparatus 21 Housing 22 1st piston 23 Bearing 24 1st hydraulic chamber 25 1st Through hole 26 Anti-rotation pin 30 Biasing mechanism 31 Cylinder 32 Second piston 33 Second hydraulic chamber 34 Abutting member 35 Coil spring 36 Bolt 37 Second through hole 40 Second support device 41 Housing 42 Bearing

Claims (10)

In a feeding device that moves a moving body in a predetermined feeding direction relative to a non-moving body,
A ball screw provided with an axis along the predetermined feed direction, and a first screw and a non-moving member, respectively, and one end side and the other end side of the ball screw are rotatably supported around the axis line A second support device, a nut screwed to the ball screw and disposed on the movable body, a drive motor for rotating the ball screw about its axis, and a control device for controlling the operation of the drive motor; With
When the moving body that moves in the one end direction of the ball screw collides with a structure disposed on the non-moving body by rotating the ball screw about its axis by the drive motor. A feeder configured to mitigate the impact,
The first support device includes :
Together with the inner portion is hollow forming a housing that penetrates the one end face from the hollow portion, parallel to the through-hole and the axis of the ball screw is formed, it is fixed to the non-mobile,
The ball screw, which is inserted into the housing, is provided so as to be movable in a direction parallel to the axis of the ball screw and non-rotating with respect to the housing , and penetrates from one end side to the other end side. A first piston formed with a holding hole parallel to the axis of
A bearing that is inserted into the through hole and rotatably supports one end side of the ball screw provided in the housing, and is held in the holding hole;
E Bei and a biasing means for biasing said first piston at one end of said ball screw,
The first piston is configured to be restricted from moving in one end direction of the ball screw,
The second support device is configured to support the other end side of the ball screw so as to be movable in the axial direction thereof. In a feeding device that moves a moving body in a predetermined feeding direction relative to a non-moving body,
A ball screw provided with an axis along the predetermined feed direction, and a first screw and a non-moving member, respectively, and one end side and the other end side of the ball screw are rotatably supported around the axis line A second support device, a nut screwed to the ball screw and disposed on the movable body, a drive motor for rotating the ball screw about its axis, and a control device for controlling the operation of the drive motor; With
When the moving body moving in the direction of the other end of the ball screw collides with a structure disposed on the non-moving body by rotating the ball screw about its axis by the drive motor. A feeder configured to mitigate the impact,
The first support device includes :
Together with the inner portion is hollow forming a housing that penetrates the one end face from the hollow portion, parallel to the through-hole and the axis of the ball screw is formed, it is fixed to the non-mobile,
The ball screw, which is inserted into the housing, is provided so as to be movable in a direction parallel to the axis of the ball screw and non-rotating with respect to the housing , and penetrates from one end side to the other end side. A first piston formed with a holding hole parallel to the axis of
A bearing that is inserted into the through hole and rotatably supports one end side of the ball screw provided in the housing, and is held in the holding hole;
E Bei and biasing means for biasing the first piston to the other end of said ball screw,
The first piston is configured to be restricted from moving in the direction of the other end of the ball screw,
The second support device is configured to support the other end side of the ball screw so as to be movable in the axial direction thereof. In a feeding device that moves a moving body in a predetermined feeding direction relative to a non-moving body,
First and second ball screws each having an axial line provided along the predetermined feed direction and the movable body, and one end side and the other end side of the ball screw rotatably supported about the axis line. 2 a support device, a nut screwed to the ball screw and disposed on the non-moving body, a drive motor that rotates the ball screw about its axis, and a control device that controls the operation of the drive motor; With
When the moving body that moves in the one end direction of the ball screw collides with a structure disposed on the non-moving body by rotating the ball screw about its axis by the drive motor. A feeder configured to mitigate the impact,
The first support device includes :
Together with the inner portion is hollow forming a housing that penetrates the one end face from the hollow portion, parallel to the through-hole and the axis of the ball screw is formed, it is fixed to the movable body,
The ball screw, which is inserted into the housing, is provided so as to be movable in a direction parallel to the axis of the ball screw and non-rotating with respect to the housing , and penetrates from one end side to the other end side. A first piston formed with a holding hole parallel to the axis of
A bearing that is inserted into the through hole and rotatably supports one end side of the ball screw provided in the housing, and is held in the holding hole;
E Bei and biasing means for biasing the first piston to the other end of said ball screw,
The first piston is configured to be restricted from moving in the direction of the other end of the ball screw,
The second support device is configured to support the other end side of the ball screw so as to be movable in the axial direction thereof. In a feeding device that moves a moving body in a predetermined feeding direction relative to a non-moving body,
First and second ball screws each having an axial line provided along the predetermined feed direction and the movable body, and one end side and the other end side of the ball screw rotatably supported about the axis line. 2 a support device, a nut screwed to the ball screw and disposed on the non-moving body, a drive motor that rotates the ball screw about its axis, and a control device that controls the operation of the drive motor; With
When the moving body moving in the direction of the other end of the ball screw collides with a structure disposed on the non-moving body by rotating the ball screw about its axis by the drive motor. A feeder configured to mitigate the impact,
The first support device includes :
Together with the inner portion is hollow forming a housing that penetrates the one end face from the hollow portion, parallel to the through-hole and the axis of the ball screw is formed, it is fixed to the movable body,
The ball screw, which is inserted into the housing, is provided so as to be movable in a direction parallel to the axis of the ball screw and non-rotating with respect to the housing , and penetrates from one end side to the other end side. A first piston formed with a holding hole parallel to the axis of
A bearing that is inserted into the through hole and rotatably supports one end side of the ball screw provided in the housing, and is held in the holding hole;
E Bei and a biasing means for biasing said first piston at one end of said ball screw,
The first piston is configured to be restricted from moving in one end direction of the ball screw,
The second support device is configured to support the other end side of the ball screw so as to be movable in the axial direction thereof.   5. The feeding device according to claim 1, wherein the urging unit includes a spring body provided in the hollow portion of the housing on the other end side of the ball screw with respect to the first piston.   4. The feeding device according to claim 2, wherein the urging unit includes a spring body provided in the hollow portion of the housing on one end side of the ball screw with respect to the first piston. The first piston has a flange formed on the outer peripheral surface thereof,
The first support device is formed in the housing, a first hydraulic chamber formed between an inner surface of the housing and a surface of the first piston collar portion on the other end side of the ball screw, and A first through hole that opens to the outer peripheral surface and the first hydraulic chamber;
The urging means has a hollow interior, a cylinder attached to the housing, a second piston that is fitted in the cylinder and is movable in the axial direction of the cylinder, and an inner surface of the cylinder A second hydraulic chamber formed between the first piston and the second piston, and the cylinder on the opposite side of the second hydraulic chamber across the second piston, with one end contacting the second piston. A spring body for urging the second piston toward the second hydraulic chamber, and a cylinder formed in the cylinder, open to an outer peripheral surface of the cylinder and the second hydraulic chamber, and in communication with the first through hole. 5. The feeding device according to claim 1, wherein the feeding device includes two through holes and hydraulic oil filled in the first hydraulic chamber and the second hydraulic chamber. The first piston has a flange formed on the outer peripheral surface thereof,
The first support device is formed in the housing, a first hydraulic chamber formed between an inner surface of the housing and a surface of the first piston flange on one end side of the ball screw, and A first through hole that opens to the outer peripheral surface and the first hydraulic chamber;
The urging means has a hollow interior, a cylinder attached to the housing, a second piston that is fitted in the cylinder and is movable in the axial direction of the cylinder, and an inner surface of the cylinder A second hydraulic chamber formed between the first piston and the second piston, and the cylinder on the opposite side of the second hydraulic chamber across the second piston, with one end contacting the second piston. A spring body for urging the second piston toward the second hydraulic chamber, and a cylinder formed in the cylinder, open to an outer peripheral surface of the cylinder and the second hydraulic chamber, and in communication with the first through hole. The feeding device according to claim 2 or 3, comprising two through holes and hydraulic oil filled in the first hydraulic chamber and the second hydraulic chamber.   The urging means penetrates into the hollow portion from the cylinder end surface on which the spring body is provided, and moves in the axial direction into the cylinder, with a screw hole formed in parallel to the cylinder axis. A contact member that is freely provided and is in contact with the other end of the spring body, and a bolt that is screwed into the screw hole and has a tip that is in contact with the contact member. The feeding device according to claim 7 or 8. Further comprising detection means for detecting a load of the drive motor;
The said control apparatus is comprised so that the said drive motor may be stopped when the load detected by the said detection means exceeds predetermined value, The one of Claim 1 thru | or 9 characterized by the above-mentioned. Feeder.

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