JP2009079648A - Slide drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slide drive device capable of linearly moving at a high speed with high output while being compact as compared with the conventional one. <P>SOLUTION: The slide drive device 20 has a rack 22 fixed to a slider 21 linearly-movably supported by a drive-device supporting table 14 and a plurality of pinion drive units 30 arranged side by side in a linear-motion direction of the slider 21. Each pinion drive unit comprises a pinion 31, a speed reducer 32, and a servomotor 33 coupled with each other coaxially. Each pinion 31 of the pinion drive units 30 is engaged with the rack 22 while output rotating shafts 33S of all servomotors 33 included in the pinion drive units 30 are coupled with each other by a timing belt 41. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a slide drive device that controls a linear movement position of a slider with a servo motor.

2. Description of the Related Art Conventionally, as an example of this type of slide drive device, there is known a device that converts a rotation output of a servo motor into a linear motion by a cam link mechanism and transmits it to a slider. In this slide drive device, a plurality of servo motors are provided as drive sources in order to linearly move the slider at high speed and high output. Specifically, a plurality of servo motors are arranged around a resultant force transmission gear that rotates integrally with the cam, and the rotation output shafts of the plurality of servo motors are respectively connected to the resultant force transmission gear (for example, Patent Document 1). reference).
JP 2007-69251 A (paragraph [0024], FIG. 1, FIG. 3, FIG. 4)

  However, in the above-described conventional slide drive device, the motor installation portion where a plurality of servo motors are installed is located at the rear end portion of the elongated linear motion region of the slider and protrudes greatly on both sides of the linear motion region. Therefore, there is a problem that it is difficult to use the slide drive device as a part of a machine tool, for example.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a slide drive device that is capable of linear motion at high speed and high output, and that is more compact than the prior art.

  In order to achieve the above object, the slide drive device according to the invention of claim 1 is configured such that a rack is fixed to a slider supported so as to be linearly movable on a base member, and a pinion, a speed reducer, and a servo motor are coaxially arranged. A plurality of pinion drive units that are arranged and connected are aligned in the linear direction of the slider and attached to the base member, and each pinion is meshed with the rack, and the output rotation shafts of all servo motors are connected by timing belts. It is characterized in that it can control the linear movement position of the slider.

  According to a second aspect of the present invention, there is provided the slide drive device according to the first aspect, wherein at least three pinion drive units are provided and the output rotation shafts of a pair of adjacent servo motors are connected by a timing belt. Has characteristics.

  The invention of claim 3 is characterized in that, in the slide drive device according to claim 1 or 2, the rack is divided into the same number as the pinion.

[Invention of Claim 1]
In the slide drive device according to the first aspect, since the plurality of pinion drive units as drive sources are arranged on one side of the elongated linear motion region of the slider, the linear motion direction and the linear motion of the slider compared to the conventional slide drive device. It becomes compact in both directions, the direction orthogonal to the direction. Further, since the slider is linearly moved by a plurality of servo motors, the slider can be linearly moved at high speed and high output. In addition, since the output rotation shafts of all the servo motors are connected by the timing belt, the servo motors can mutually regulate oscillation and prevent servo down due to heat generation.

[Invention of claim 2]
According to the configuration of the second aspect, since at least three pinion drive units are provided and the output rotation shafts of the adjacent pairs of servo motors are connected to each other by the timing belt, each timing belt is relatively short. The slack of the timing belt can be easily eliminated.

[Invention of claim 3]
According to the configuration of the third aspect, since the rack is divided into the same number as the pinion, it is possible to make the rack the minimum necessary length in accordance with the linear motion stroke of the slider.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a drawing machine 10 having a plurality of slide drive devices 20 according to the present invention arranged side by side. The drawing machine 10 is provided with a plurality of molding holes 12A in the die 12 corresponding to the plurality of slide driving devices 20, and a plurality of punches 25 inserted into and extracted from the plurality of molding holes 12A. Yes.

  Specifically, as shown in FIG. 2, the drawing machine 10 has a rectangular parallelepiped base 11. From the upper surface of the pedestal 11, the upright support wall 13 and the die 12 stand up against each other. In addition, punch insertion holes 13A are formed through the standing support wall 13 so as to be coaxial with the molding holes 12A of the die 12, and the punches 25 are inserted into the punch insertion holes 13A so as to be capable of linear movement.

  As shown in FIG. 2, a driving device support table 14 (corresponding to a “base member” according to the present invention) is fixed to the surface of the upright support wall 13 opposite to the die 12. The drive device support table 14 has a structure in which reinforcing ribs 14L are provided on the lower surface of a support plate 14B that is flat and horizontal.

  As shown in FIG. 1, a square groove 14M is formed in the support plate 14B immediately below the central axis of the punch insertion hole 13A. Further, as shown in FIG. 3, a pair of locking plates 23 and 23 are fixed to the upper surface of the support plate 14B so as to narrow the width of the upper surface opening of the square groove 14M from both sides in the width direction.

  The slider 21 is engaged with the square groove 14M so as to be linearly movable. As shown in FIGS. 1 and 2, the slider 21 has a substantially prismatic shape extending in the central axis direction of the punch insertion hole 13 </ b> A, and the proximal end portion of the punch 25 is fixed to the distal end portion of the slider 21. . Further, a slide engagement protrusion 21A is formed so as to protrude downward from the lower surface of the slider 21. As shown in FIG. 3, the slide engagement protrusion 21A has a wide lower end. And the lower end wide part of 21 A of slide engaging protrusions is accommodated in the square groove 14M so that a linear movement is possible, and the upward movement is controlled by the locking plates 23 and 23. FIG.

  As shown in FIG. 2, on the side surface of the slider 21, a plurality of racks 22 (for example, three) extending in the linear motion direction of the slider 21 are arranged in a straight line. Each rack 22 is fixed to a rack fixing wall 21 </ b> D (see FIG. 3) that protrudes laterally from the lower side edge of the slider 21. The plurality of teeth formed on the slider 21 has a so-called “helical structure” that is inclined with respect to the width direction of the slider 21. Correspondingly, the pinion 31 described below also has a “helical structure”.

  As shown in FIG. 1, a plurality of (for example, three) upper and lower through holes 14 </ b> C are formed in a side position of the support plate 14 </ b> B with respect to the rack 22 along the linear movement direction of the slider 21. The pinion drive unit 30 according to the present invention is fitted and fixed in the hole 14C.

  As shown in FIG. 3, the pinion drive unit 30 has a structure in which a pinion 31, a reduction gear 32, and a servo motor 33 are coaxially arranged and connected. The speed reducer 32 includes a plurality of gears inside a cylindrical speed reducer body 32H extending in the vertical direction. Then, the upper end portion of the speed reducer main body 32H is fitted into the upper and lower through holes 14C of the support plate 14B from below, and the flange 32F projecting laterally from the position near the upper end of the speed reducer main body 32H is brought into contact with the lower surface of the support plate 14B. In this state, the speed reducer 32 is fixed to the support plate 14B with bolts. The output shaft 32J of the speed reducer 32 is disposed at the center of the upper end portion of the speed reducer main body 32H, and is rotatably supported by the speed reducer main body 32H by a bearing (not shown) built in the speed reducer main body 32H. The pinion 31 is key-connected to the output shaft 32J so as to be integrally rotatable, and meshes with the rack 22.

  As shown in FIG. 2, the input shaft 32G of the speed reducer 32 is disposed at the center of the lower end portion of the speed reducer main body 32H. A relay shaft case 34 is attached to the lower end portion of the speed reducer main body 32H, and a stator 33T of the servo motor 33 is fixed to the lower end portion of the relay shaft case 34. Further, in the relay shaft case 34, a relay shaft 35 is rotatably supported by bearings 35B1 and 35B2. The input shaft 32G of the speed reducer 32 is key-connected to the upper end portion of the relay shaft 35 so as to be integrally rotatable, while the output rotation shaft 33S of the servo motor 33 is key-connected to be integrally rotatable to the lower end portion of the relay shaft 35. Has been.

  A pulley is key-connected to an intermediate portion of the relay shaft 35 so as to be integrally rotatable. As shown in FIG. 2, the pulleys in the pinion drive units 30, 30 adjacent to each other with the timing belt 41 are connected through a belt insertion hole 34 </ b> W formed through the side portion of the relay shaft case 34. Specifically, a pair of pulleys 37 and 37 are key-connected to the relay shaft 35 of the central pinion drive unit 30 among the three pinion drive units 30, and each relay shaft of the pinion drive units 30 and 30 at both ends. One pulley 36 is key-connected to 35. Then, a pulley 36 provided in the pinion drive unit 30 on one end side and one pulley 37 provided in the central pinion drive unit 30 are coupled to each other by a timing belt 41 so as to be capable of interlocking rotation, and connected to the pinion drive unit 30 on the other end side. The pulley 36 provided and the other pulley 37 provided in the central pinion drive unit 30 are connected by a timing belt 41 so as to be capable of interlocking rotation.

  A pulley bracket 39 is fixed to the drive device support table 14 between the adjacent pinion drive units 30 and 30, and idle pulleys 38 rotatably supported by the pulley brackets 39 are respectively connected to the timing belts 41. Each timing belt 41 is tensioned by being pressed against the inner surface or the outer surface.

  The drawing machine 10 is provided with a plurality of slide control devices (not shown) corresponding to the plurality of slide drive devices 20. Each slide control device stores rotational position data relating to each servo motor 33 of the corresponding slide drive device 20. Further, the slide control device takes in a detection signal of a rotational position sensor (not shown) included in each servo motor 33. Then, the slide control device generates a command value for the rotational position of each servo motor 33 for each predetermined period based on the stored rotational position data and the reduction ratio of the speed reducer 32. A motor drive current corresponding to the deviation between the actual rotation position of the servo motor 33 detected by the rotation position sensor and the command value is supplied to the servo motor 33, thereby controlling the linear movement position of the slider 21.

  A workpiece (not shown) formed by the drawing machine 10 has, for example, a cylindrical shape. Further, the drawing machine 10 is provided with a work feeder (not shown) for each slide driving device 20, and each work feeder enters from between the die 12 and the upright support wall 13 from above and is positioned forward of the molding hole 12 </ b> A. It is designed to hold the workpiece.

  This completes the description of the configuration of the present embodiment. Next, the effect of this embodiment is demonstrated. When the drawing machine 10 is activated, each work feeder holds the work at a position in front of the forming hole 12A, and in this state, each slide control device drives all the servo motors 33 provided in each slide drive device 20. The punch 25 is advanced toward the punch insertion hole 13A. Then, the work is pushed into the forming hole 12A together with the punch 25 and is drawn. Then, the work is discharged downward from the opening at the back of the forming hole 12A, and the punch 25 is retracted. Thereafter, this operation is repeated. Here, since each slide drive device 20 of the present embodiment linearly moves the slider 21 by the plurality of servo motors 33, the slider 21 can be linearly moved at high speed and high output.

  By the way, when the punch 25 of each slide drive device 20 pushes the workpiece into the forming hole 12A, the processing resistance at that time is applied to the plurality of servo motors 33. However, due to backlash between the pinion 31 and the rack 22, processing resistance may be applied only to some servo motors 33, and processing resistance may not be applied to the remaining servo motors 33. However, in the slide drive device 20 of the present embodiment, since the output rotation shafts 33S of all the servomotors 33 are connected by the timing belt 41, the servomotor 33 that is subjected to machining resistance is the servomotor 33 that is not subjected to machining resistance. It is possible to prevent the servo down due to heat generation.

  Moreover, in the slide drive device 20 of the present embodiment, the plurality of pinion drive units 30 including the servomotor 33 are arranged side by side on one side of the elongated linear motion region of the slider 21, so that the slider can be compared with the conventional slide drive device. It becomes compact in both the linear motion direction 21 and the direction orthogonal to the linear motion direction. Thereby, a plurality of slide driving devices 20 can be arranged side by side as in the drawing machine 10. Further, in the slide drive device 20 of the present embodiment, the output rotation shafts 33S and 33S of the pair of adjacent servomotors 33 and 33 among the plural (three) pinion drive units 30 are respectively connected by the timing belt 41. Since the timing belts 41 are connected, the timing belts 41 can be made relatively short, and the slack of the timing belts 41 can be easily removed. Further, since the rack 22 is divided into the same number as the pinion 31, the rack 22 can be made the minimum necessary length in accordance with the linear motion stroke of the slider 21, and thus the manufacturing cost can be suppressed.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the above embodiment, the rack 22 is divided into the same number as the pinions 31, but a configuration in which a plurality of pinions 31 are meshed with one rack 22 may be adopted.

  (2) In the above-described embodiment, adjacent pairs of the servomotors 33, 33 among the plurality of servomotors 33 are connected to each other by the timing belt 41, but all of the plurality of servomotors are connected to one timing. You may connect with a belt.

The top view of the slide drive device concerning one embodiment of the present invention. Side sectional view of slide drive Side sectional view of pinion drive unit

Explanation of symbols

10 Drawing machine 14 Drive device support table (base member)
DESCRIPTION OF SYMBOLS 20 Slide drive device 21 Slider 22 Rack 25 Punch 30 Pinion drive unit 31 Pinion 32 Reduction gear 33 Servo motor 33S Output rotating shaft 35 Relay shaft 41 Timing belt

Claims (3)

Fix the rack to the slider supported by the base member so that it can move directly,
A plurality of pinion drive units in which a pinion, a speed reducer, and a servo motor are coaxially arranged and connected are arranged in the linear motion direction of the slider and attached to the base member,
The pinions are meshed with the rack, and the output rotation shafts of all the servo motors are connected by timing belts, and the servo motors cooperate to control the linear movement position of the slider. Slide drive device.   2. The slide drive device according to claim 1, wherein at least three pinion drive units are provided, and output rotation shafts of a pair of adjacent servo motors are connected by the timing belt.   The slide drive device according to claim 1, wherein the rack is divided into the same number as the pinion.

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