JP2008298255A - Linearly moving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double speed linearly moving device capable of improving durability, and capable of restraining vibration when stopping. <P>SOLUTION: This linearly moving device 10 are constituted so that the moving direction of a first nut member 14 caused by rotation of a first feed screw 11, and the moving direction of a second nut member 20 caused by rotation of a second feed screw 18 rotating by interlocking with the first feed screw 11 by a timing belt 17, mutually become the inverse direction. Any one of the first nut member 14 and the second nut member 20 is fixed to a fixed member, and a moving member 21 is installed in the other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a linear motion device.

  Conventionally, various linear motion devices that improve the moving speed of the moving member have been proposed (see, for example, Patent Documents 1 to 5).

In the linear motion devices disclosed in Patent Documents 1 to 5, pulleys are arranged on both ends of a support body that is relatively movable with respect to the fixed member, and a predetermined position of the belt spanned between both pulleys is used as the fixed member. In addition to fixing, the moving member is attached to a position opposite to a predetermined position of the belt fixed to the fixing member. Due to the circulation of the belt accompanying the rotation of the pulley, the moving member moves relative to the support, and the support moves relative to the fixed member in the same direction.
JP 2002-340127 A JP 2003-127145 A JP 2000-351138 A JP 09-119438 A JP 2000-160939 A

  However, in each of the linear motion devices disclosed in Patent Documents 1 to 5, a moving member is attached to the belt and directly driven by the belt, and a large load is applied to the belt during driving and braking due to the inertia of the moving member. Since the belt is stretched by the application, there are problems such as durability and vibration of the moving member.

  The present invention has been made to eliminate such inconveniences, and an object of the present invention is to provide a linear motion device that has excellent durability and can suppress vibration of a moving member.

The above object of the present invention can be achieved by the following constitution.
(1) a first feed screw rotatably supported by a support;
A first nut member screwed into the first feed screw so as to be movable along the first feed screw is disposed in parallel adjacent to the first feed screw, and is rotatable on the support. A second feed screw supported by the second feed screw; a second nut member screwed into the second feed screw movably along the second feed screw; the first feed screw; Drive means for rotating the two feed screws, the first feed screw, and the second feed screw provided on the same end of the first feed screw, and the second feed screw. Rotational transmission means that rotates in conjunction with the first feed screw, the second nut rotating in conjunction with the first feed screw, and the moving direction of the first nut member as the first feed screw rotates. The moving direction of the second nut member accompanying the rotation of the feed screw is configured to be opposite to each other. It is, the first nut member, and wherein one of the second nut member is fixed to the fixing member, the linear motion device, characterized in that the moving member is attached to the other.
(2) The first feed screw and the second feed screw are rotated in the same direction in conjunction with the rotation transmission means, one of which is a forward screw and the other is a reverse screw, The linear motion device according to (1), wherein the rotation transmission means includes a pulley fixed to the end portion of each of the feed screws and a transmission belt stretched between the pulleys.
(3) Each of the first feed screw and the second feed screw is a forward screw or a reverse screw, and rotates in opposite directions in conjunction with the rotation transmission means ( A linear motion device according to 1).

  According to the linear motion device of the present invention, the moving direction of the first nut member accompanying the rotation of the first feed screw and the second feed screw rotating in conjunction with the first feed screw by the rotation transmission means. The moving direction of the second nut member accompanying the rotation is opposite to each other, and when the one feed screw is driven to rotate by the driving means, the moving member moves relative to the support. Further, the support body moves in the same direction with respect to the fixing member. Thereby, the moving speed of the moving member is improved.

  According to the linear motion device of the present invention, the moving member is attached to the nut member and driven by the feed screw, and a belt that directly receives the thrust of the moving member is not used. Thereby, while being able to improve durability, the vibration of a moving member can be suppressed.

Hereinafter, an embodiment of a linear motion device according to the present invention will be described in detail with reference to the drawings.
1 is a cross-sectional view for explaining an embodiment of a double speed linear motion device according to the present invention, FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, and FIG. 3 is a modified example of the double speed linear motion device shown in FIG. It is sectional drawing for demonstrating.

  As shown in FIGS. 1 and 2, the linear motion device 10 of the present embodiment includes a frame 22 as a support, a first ball screw 30, and a second ball screw 40.

  The ball screw 30 includes a first feed screw 11 and a first nut member 14 screwed into the first feed screw 11 via a plurality of rolling elements (not shown). One end portion (left end portion in FIG. 1) of the feed screw 11 is rotatably supported by the frame 22 via a bearing portion 31, and the other end portion (right end portion in FIG. 1) of the feed screw 11 is interposed via a bearing portion 32. The frame 22 is rotatably supported. Of the bearing portions 31, 32, only 32 is shown in a sectional view.

  A motor shaft of a motor 13 as drive means is connected to an end protruding from the bearing portion 31 on one end side of the feed screw 11 via a coupling 12 such as a coupling. The motor 13 is attached to a frame 22. ing. A first pulley 16 (toothed pulley) is attached to an end protruding from the bearing portion 32 on the other end side of the feed screw 11.

  The nut member 14 is fixed to the installation surface G of the fixing member via the base plate 15. As shown in FIG. 2, sliders 23 b of the first linear motion guide device 23 are attached to both sides of the nut member 14 on the upper surface of the base plate 15, and the sliders 23 b are linear motions attached to the frame 22. A guide rail 23a of the guide device 23 is supported through a plurality of rolling elements (not shown) so as to be relatively movable in the axial direction.

  The ball screw 40 is located above the ball screw 30 and is disposed adjacent to and parallel to the feed screw 11, and the second feed screw 18 includes a plurality of rolling elements (not shown). ) And the second nut member 20 screwed together.

  One end portion (left end portion in FIG. 1) of the feed screw 18 is rotatably supported by the frame 22 via the bearing portion 41, and the other end portion (right end portion in FIG. 1) of the feed screw 18 is interposed via the bearing portion 42. The frame 22 is rotatably supported. Of the bearing portions 41 and 42, only 42 is shown in a sectional view. A second pulley 19 (toothed pulley) is attached to an end portion protruding from the bearing portion 42 on the other end side of the feed screw 18, and the timing belt 17 ( (Toothed belt) is stretched over. The pulleys 16 and 19 and the timing belt 17 constitute rotation transmission means.

  A linear motion table 21 as a moving member is fixed to the nut member 20. As shown in FIG. 2, sliders 24 b of the second linear motion guide device 24 are attached to both sides of the nut member 20 on the lower surface of the linear motion table 21, and the slider 24 b is attached to the frame 22. The guide rail 24a of the linear motion guide device 24 is supported by a plurality of rolling elements (not shown) so as to be relatively movable in the axial direction.

  1A is an initial state, and in this initial state, the nut member 20 is disposed on the bearing portion 41 side close to the motor 13, and the nut member 14 is disposed on the bearing portion 32 side away from the motor 13. ing.

  When the motor 13 is operated, the feed screw 11 of the ball screw 30 is driven and rotated via the coupling 12, and the rotation of the feed screw 11 is performed via the pulley 16, the timing belt 17, and the pulley 19. It is transmitted to the feed screw 18 of the screw 40, and the feed screw 11 and the feed screw 18 rotate in conjunction with each other.

  In the present embodiment, the timing belt 17 is stretched around the pulley 16 and the pulley 19 in a substantially zero shape, and the feed screw 11 and the feed screw 18 are rotated in the same direction by the timing belt 17. One of the feed screw 11 and the feed screw 18 is a forward screw, and the other is a reverse screw. With this configuration, the moving direction of the nut member 14 accompanying the rotation of the feed screw 11 and the moving direction of the nut member 20 accompanying the rotation of the feed screw 18 rotating in conjunction with the feed screw 11 are opposite to each other. Yes.

  Further, in the present embodiment, the pulley 16 and the pulley 19 have the same diameter, and the feed screw 11 and the feed screw 18 have the same pitch, and the displacement amount of the nut member 14 accompanying the rotation of the feed screw 11 is the same. The amount of displacement of the nut member 20 with the rotation of the feed screw 18 that rotates in conjunction with the feed screw 11 is equal.

  And since the nut 14 member is being fixed to the installation surface G via the base plate 15, the flame | frame 22 moves to the same direction as the nut member 20, as shown in FIG.1 (b). Thereby, the linear motion table 21 attached to the nut member 20 is a distance L2 (= L1 + L1) obtained by combining the axial movement distance L1 of the nut member 20 with respect to the feed screw 18 and the axial movement distance L1 of the frame 22. ) Is moved, and the moving speed of the linear motion table 21 relative to the installation surface G is double the moving speed when only the feed screw 18 is used.

  As described above, according to the linear motion device 10 of the present embodiment, the moving direction of the first nut member 14 accompanying the rotation of the first feed screw 11, and the first feed screw 11 by the timing belt 17. The moving direction of the second nut member 20 accompanying the rotation of the second feed screw 18 that rotates in conjunction with each other is opposite to each other, and one feed screw 11 is rotationally driven by the motor 13. As a result, the linear motion table 21 moves with respect to the frame 22, and further, the frame 22 moves in the same direction with respect to the installation surface G. Thereby, the moving speed of the linear motion table 21 is improved.

  According to the linear motion device 10 of the present embodiment, the linear motion table 21 is attached to the nut member 20 and is driven by the feed screw 18, and a belt that receives a thrust for moving the direct motion table 21 is necessary. And not. Therefore, the vibration of the linear motion table 21 at the time of braking does not occur during driving due to the large load received by the belt that directly drives the linear motion table 21. In this embodiment, the timing belt 17 that rotates the feed screws 11 and 18 in conjunction with each other is used. However, this does not directly receive the thrust (load) for moving the linear motion table 21. Compared with the belt that directly drives the linear motion table 21, the load acting during driving and braking can be reduced sufficiently small. Thereby, durability can be improved and vibration of the linear motion table 21 can be suppressed. Further, the timing belt 17 is stretched around the feed screws 11 and 18 arranged side by side via the pulleys 16 and 19, and the length of the timing belt 17 can be shortened. Therefore, the amount of expansion and contraction of the belt is sufficiently small.

  In addition, this invention is not limited to embodiment mentioned above, In the range which does not deviate from the summary of this invention, it can change suitably.

  For example, in the above-described embodiment, the linear motion guide devices 23 are disposed on both sides of the nut member 14 on the upper surface of the base plate 15, and the linear motion guide devices 24 are disposed on both sides of the nut member 20 on the lower surface of the linear motion table 21. However, instead of this, as shown in FIG. 3, two linear motion guide devices 23 are arranged on one side of the nut member 14 on the upper surface of the base plate 15, and the lower surface of the linear motion table 21 is Two linear motion guide devices 24 may be arranged on one side of the nut member 20.

Further, the rotation transmission means is a combination of a toothed pulley and a timing belt, but is not limited thereto. For example, instead of the timing belt, another transmission belt such as a V belt, a flat belt, a steel belt, or the like is used. May correspond to each.
Further, the moving direction of the first nut member 14 accompanying the rotation of the first feed screw 11 and the second nut member accompanying the rotation of the second feed screw 18 that rotates in conjunction with the first feed screw 11. In the above-described embodiment, when the moving direction of 20 is opposite to each other, in the above-described embodiment, the timing belt 17 as a transmission belt is stretched over the pulley 16 and the pulley 19 in a substantially 0 shape, 11 and the feed screw 18 are rotated in the same direction, and one of the feed screw 11 and the feed screw 18 is a forward screw and the other is a reverse screw. When using what can be handed over, instead of this, the feed screw 11 and the feed screw 18 are both forward screws or reverse screws, and the timing belt 17 is formed in an approximately 8-character shape. Over Li 16, and passes over the pulley 19 may be rotated feed screw 11, and the feed screw 18 in opposite directions.
Further, instead of the combination of the transmission belt and the pulley, a gear, a friction wheel, or the like may be used as the rotation transmission means. For example, when a pair of gears is used, the twist directions of the feed screws 11 and 18 are the same. do it.

  The moving speed of the linear motion table 21 is not limited to double speed, and can be adjusted by appropriately setting the diameters of the pulleys 16 and 19 and the pitch of the feed screws 11 and 18.

FIG. 1 is a cross-sectional view for explaining an embodiment of a double speed linear motion device according to the present invention. FIG. 1 (a) is a diagram showing a state (initial state) before double speed driving, and FIG. It is a figure which shows a state. It is the II-II sectional view taken on the line of FIG. It is sectional drawing for demonstrating the modification of the double speed linear_motion | direct_drive apparatus shown in FIG.

Explanation of symbols

10 linear motion device 11 first feed screw 13 motor (drive means)
14 First nut member 17 Timing belt (power transmission belt)
18 Second feed screw 20 Second nut member 21 Linear motion table (moving member)
22 Frame (support)
G Installation surface of fixing member

Claims (3)

A first lead screw rotatably supported on the support;
A first nut member threadably engaged with the first lead screw movably along the first lead screw;
A second feed screw disposed in parallel adjacent to the first feed screw and rotatably supported by the support;
A second nut member threadably engaged with the second feed screw movably along the second feed screw;
Drive means for rotating the first feed screw or the second feed screw;
Rotational transmission means provided at the same end of the first feed screw and the second feed screw, and rotating the first feed screw and the second feed screw in conjunction with each other;
With
The movement direction of the first nut member accompanying the rotation of the first feed screw and the second nut member accompanying the rotation of the second feed screw rotating in conjunction with the first feed screw. The moving direction is configured to be opposite to each other,
One of the first nut member and the second nut member is fixed to a fixed member, and a moving member is attached to the other.   The first feed screw and the second feed screw rotate in the same direction in conjunction with the rotation transmission means, one of which is a forward screw and the other is a reverse screw, and the rotation transmission 2. The linear motion device according to claim 1, wherein the means includes a pulley fixed to the end portion of each of the feed screws and a transmission belt stretched between the pulleys.   The first feed screw and the second feed screw are both forward screws or reverse screws, and rotate in opposite directions in conjunction with the rotation transmission means. The linear motion device described.

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