JP2607378Y2 - Carriage movement positioning device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carriage moving / positioning apparatus which mainly moves and positions a carriage used in a machine tool such as a punch press.

[0002]

2. Description of the Related Art A machine tool such as a punch press is provided with a carriage moving positioning device which has an operation of moving and positioning a carriage provided with a clamp device for gripping a plate-like work in a predetermined direction. are doing. Briefly describing this general and well-known carriage movement positioning device, a carriage guide that supports the carriage so as to be movable in a predetermined direction is provided on the frame so as to extend in a predetermined direction. The frame is provided with a ball screw extending in a predetermined direction interlockingly connected to a servomotor, and a nut member screwed to the ball screw is integrally attached to the carriage.

[0003] With the above structure, by driving and controlling the servo motor to rotate the ball screw, the carriage can be moved in a predetermined direction while being guided by the carriage guide, and can be moved and positioned at a predetermined position in the predetermined direction. .

[0004]

[Problems to be solved by the invention] However, when the moving positioning range of the carriage is wide and the ball screw is long,
Due to the relationship between the length of the ball screw and the critical speed, it is necessary to reduce the number of rotations of the ball screw. For this reason, when the moving position range of the carriage is wide, the moving position of the carriage cannot be performed at high speed. On the other hand, if the lead of the ball screw is enlarged in order to perform the moving and positioning of the carriage at high speed, the moving and positioning of the carriage cannot be performed accurately.

Accordingly, an object of the present invention is to provide a carriage moving positioning device which can solve the above-mentioned problems.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention provides a movable carriage along a carriage guide provided on a base, and the carriage is provided in parallel with the carriage guide and on the base. A nut member provided on the carriage is movably screwed to a ball screw rotatably supported on the ball member. The ball member is movably supported by the carriage guide at both sides of the nut member, and the ball In a carriage movement positioning device provided with first and second support devices for supporting a screw, the support device includes a plurality of driven rollers that are rotatably driven in contact with an outer peripheral surface of the ball screw. An axis of the support roller is provided to be inclined with respect to an axis of the ball screw, and each of the support rollers is driven to rotate when the ball screw rotates. Wherein it along Carriage guide those configured to move the support device to the same direction as the moving direction of the carriage.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, with reference to the drawings, a reference example will be described first to facilitate understanding. Now,
Referring to FIGS. 1, 2, and 3, a carriage movement positioning device 1 in a machine tool such as a punch press moves a carriage 5 having a plurality of clamp devices 3 for gripping a plate-shaped work W in a left-right direction (see FIG. 1, and has a function of moving and positioning in the left-right direction in FIG. 2 and in the front-back direction in FIG. This carriage moving positioning device 1 is provided on a work table 7 of a machine tool as shown in, for example, Japanese Utility Model Publication No. 1-444188, and moves integrally with a movable table 9 constituting a part of the work table 7 in the front-rear direction. Is what you do.

The carriage moving positioning device 1 will be described in detail. For example, a movable base 9 of a work table 7 of a machine tool is provided with a carriage base 11 extending in the left-right direction. Is provided with a pair of carriage guides 13 extending in the left-right direction. The carriage 5 is provided on the carriage guide 13 via a traveling portion 15 so as to be movable in the left-right direction. The clamp device 3 is configured to be adjustable in the left-right direction with respect to the carriage 5.

A ball screw 17 extending in the left-right direction is rotatably provided on the rear surface of the carriage base 11 via bearings 19a and 19b. A nut member 21 screwed to the ball screw 17 is attached to the carriage 5. It is provided integrally. In order to rotate the ball screw 17, a servo motor 23 is provided on the front right portion of the carriage base 11 via a bracket 25, and an output shaft of the servo motor 23 is connected to the ball screw 17 by a driving pulley 27 and a timing belt 29. , Are interlockingly connected via a driven pulley 31.

Referring to FIGS. 1, 4 and 5, a ball screw 17 is rotatably supported on the right side of the carriage 5 (right side in FIGS. 1 and 5, front side in FIG. 4). A first support device 33 is provided, and a second support device 35 is provided on the left side of the carriage 5.

Each of the support devices 33 and 35 includes a support body 37 and a support member 3 provided in the support body 37.
9 is provided. The support body 37 is supported by the carriage guide 13 via a traveling portion 41 so as to be movable in the left-right direction. The support member 39 is fitted to the ball screw 17.

The first support device 33 is configured to move in the left-right direction in conjunction with the movement of the carriage 5 in the left-right direction.

More specifically, a hanging wheel 45 for hanging a string-like member 43 such as a chain or a wire is rotatably provided at an appropriate position of the first support device 33 disposed on the right side of the carriage 5. One end of the string-shaped member 43 is fixed to the mounting portion 47 of the carriage base 11, and the other end of the string-shaped member 43 is fixed to an appropriate position of the carriage 5. Here, in order to apply an appropriate tension to the string-shaped member 43, a spring 49 for urging the first support device 33 rightward away from the carriage 5 is provided at an appropriate position.
An urging member as shown in FIG. Here, the string-shaped member 43, the hanging wheel 45, and the like are configured so that the distance between the first support device 33 and the right bearing 19a is substantially half the distance between the carriage 5 and the right bearing 19a ( See FIG. 6).

Similarly, the second support device 35 is configured to move in the left and right direction in conjunction with the movement of the carriage 5 in the left and right direction, and the distance between the second support device 35 and the left bearing 19b is determined by the carriage. It is configured so as to be approximately half of the distance between the bearing 5 and the left bearing 19b (see FIG. 6).

The operation will be described based on the above configuration.

By driving and controlling the servo motor 23 to rotate the ball screw 17, the carriage 5 is moved left and right while being guided by the carriage guide 13,
It can be moved and positioned at a predetermined position in the left-right direction.

At this time, when the carriage 5 moves rightward toward the first support device 33 (moves away from the second support device 35) by m, the first support device 33 moves With the action of the string-shaped member 43, the spring 49 moves rightward by m / 2 by the urging force of the spring 49. Thereby, as shown in FIG. 6, the distance between the carriage 5 and the right bearing 19a changes from La to La-m, and the distance between the first support device 33 and the right bearing 19a changes to La '.
(= La / 2) to La / 2−m / 2.

Conversely, when the carriage 5 moves leftward away from the first support device 33 (approaching to the second support device 35) by m, the first support device 33 is moved by the string-like member 43. The spring 49 is pulled leftward by m / 2 against the urging force of the spring 49. As a result, the distance between the carriage 5 and the right bearing 19a changes from La to La + m, and the first support device 33 and the right bearing 19a
Is changed from La ′ to La / 2 + m / 2.

Similarly, when the carriage 5 moves rightward by m, as shown in FIG. 6, the second support device 35 moves rightward by m / 2, and the distance between the carriage 5 and the left bearing 19b is increased. Is from Lb to Lb + m, and the distance between the second support device 35 and the left bearing 19b is Lb '(= Lb /
Lb / 2 + m / 2 from 2). Conversely, when the carriage 5 moves leftward by m, the second support device 35
Moves leftward by m / 2, the distance between the carriage 5 and the left bearing 19b changes from Lb to Lb-m, and the distance between the second support device 35 and the left bearing 19b changes from Lb 'to Lb / m.
2-m / 2.

Therefore, when the carriage 5 is moved and positioned, the center of the right half of the carriage 5 in the ball screw 17 is always supported by the first support device 33, and the center of the left half of the carriage 5 in the ball screw 17 is Since the ball screw 17 is always supported by the second support device 35, the support span of the ball screw 17 can be reduced to approximately half of the normal span.

According to the above configuration, the ball screw 1
Since the support span of the ball screw 17 can be shortened (substantially halved), the permissible rotational speed of the ball screw 17 with respect to the critical speed can be increased (about four times the normal speed) without increasing the lead of the ball screw 17. can do. Therefore, even when the moving positioning range of the carriage 5 is wide, the carriage 5 can be moved and positioned at high speed and precisely.

Next, an embodiment of the present invention will be described with reference to FIGS.
First and second support devices 51, 53 corresponding to 3, 35
(Only one support device 51, 53 is shown in the figure)
Will be described.

Each of the support devices 51 and 53 comprises a support body 55, a linear actuator 57 provided on the support body 55, and the like. At the right and left sides in FIG. 8 (right and left directions in FIG. 8). The linear actuator 57 includes a plurality of (three in this example) roller sets 61 at equal intervals.
7 is provided with a plurality (three in this example) of support rollers 63 for pressing and supporting the same 7 through a pressing force of a spring (not shown). Further, each support roller 63 is inclined by a predetermined angle with respect to the screw direction of the ball screw 17 so that the linear actuator 57 moves substantially half a lead by one rotation of the ball screw 17. Each of the support rollers 63 follows the rotation of the ball screw 17 and integrally rotates.

Here, the position of the first support device 51 with respect to the ball screw 17 is set so that the distance between the first support device 51 and the bearing 19a is substantially half of the distance between the carriage 5 and the bearing 19a. Similarly, the position of the second support device 53 with respect to the ball screw 17 is set such that the distance between the second support device 53 and the bearing 19b is substantially half of the distance between the carriage 5 and the bearing 19b.

In the above configuration, when the ball screw 17 is rotated, each support roller 6 is driven by the rotation of the ball screw 17.
3 rotates, and a component force in the longitudinal direction of the ball screw 17 is generated, and the support body 55 is moved along the carriage guide 13 by the component force. That is, the ball screw 17
The support device is moved using the rotation of.

Referring to FIG. 9, the support devices 33, 3
First and second support devices 65 and 67 having a configuration different from that of the first and second support devices 65 and 67 (in FIG.
A reference example will be described.

Each of the support devices 65 and 67 has a support body 69 and a nut member 73 rotatably provided in the support body 69 via a bearing 71.
The support body 69 is supported by the carriage guide 13 via a traveling portion 75 so as to be movable in the left-right direction (left-right direction in FIG. 9), and the nut member 73 is screwed into the ball screw 17. .

A support block 77 is integrally provided on the upper side of the support main body 69.
, A rotation shaft 81 of a pinion 79 is rotatably supported via a bearing 83. The pinion 79 is engaged with a wheel gear 85 provided integrally with the nut member 73, and is provided with a magnetic clutch 8 provided at an appropriate position.
By the operation of 7, it is possible to switch between a state in which the support block 77 can rotate freely and a state in which the support block 77 cannot rotate. Note that a clutch device such as a magnet brake may be used instead of the magnet clutch 87.

With the above configuration, the magnet clutch 87
When the pinion 79 is made rotatable with respect to the support block 77 by the operation of, the wheel gear 85 and the nut member 73 are made rotatable with respect to the support body 69. Thus, even if the ball screw 17 is rotated, the nut member 73 simply rotates integrally with the ball screw 17, and the support devices 65 and 67 move in the left-right direction (the left-right direction in FIG. 9) with respect to the ball screw 17. It does not.

When the pinion 79 cannot be rotated with respect to the support block 77 by the operation of the magnet clutch 87, the wheel gear 85 and the nut member 73 cannot be rotated with respect to the support body 69. Thus, when the ball screw 17 is rotated, the support device 6 is rotated.
5 and 67 can move in the left-right direction with respect to the ball screw 17. That is, the support devices 65 and 67 move in the left-right direction using the rotation of the ball screw 17.

Therefore, when the carriage 5 is moved in the left-right direction, the magnet clutch 87 is appropriately operated and the first support device 65 and the second support device 67 are operated.
Is moved in the left-right direction without interfering with the carriage 5, the support span of the ball screw 17 can be shortened, and the same effect as described above can be obtained.

[0032]

As will be understood from the description of the present embodiment as described above, the present invention basically provides a movable carriage (5) along a carriage guide (13) provided on a base (11). A nut member (21) provided in the carriage (5) is movably screwed into a ball screw (17) supported in parallel with the carriage guide (13) and rotatably on the base (11). A first and a second support device that are movably supported by the carriage guide (13) at both sides of the nut member (21) and support the ball screw (17). In the carriage moving / positioning device, the support device includes a plurality of support rollers (63) rotatably driven and in contact with an outer peripheral surface of the ball screw (17).
The axis of each support roller (63) is connected to the ball screw (1).
The ball screw (1) is provided to be inclined with respect to the axis of 7).
When the support roller (63) is driven to rotate during the rotation of (7), the support device is moved in the same direction as the carriage (5) along the carriage guide (13). is there.

As apparent from the above configuration, in the present invention, the support devices provided on both sides of the carriage 5 having the nut member 21 screwed to the ball screw 17 are provided on the outer peripheral surface of the ball screw 17. The shaft center of the plurality of support rollers 63 that can rotate in contact with the driven
And the support rollers 63 are driven to rotate when the ball screw 17 rotates, so that the carriage 5 moves in the same direction as the moving direction of the carriage 5 by a component force. From the said 25
Not only is the support span of the ball screw 17 on both sides of the support device shortened, but also the axis of the plurality of support rollers 63 provided in the support device is inclined with respect to the axis of the ball screw 17, In addition, since the support roller 63 is configured to rotate following the contact with the peripheral surface of the ball screw 17, the support device can be moved in the same direction at a speed lower than the moving speed of the carriage 25. And the like do not need to be particularly controlled, and the configuration becomes simpler.

[Brief description of the drawings]

FIG. 1 is a plan view of a carriage moving positioning device showing a reference example, and omits a carriage guide and a clamp device.

FIG. 2 is a plan view of a carriage moving positioning device,
Ball screw and support device are omitted.

FIG. 3 is a view taken along the line III-III in FIG. 2;

FIG. 4 is a view taken along line IV-IV in FIG.

FIG. 5 is a view schematically showing an arrow V in FIG. 1;

FIG. 6 is an operation explanatory view.

FIG. 7 is a diagram showing an embodiment of the support device according to the embodiment of the present invention.

FIG. 8 is a view along the line VIII-VIII in FIG. 7;

FIG. 9 is a sectional view showing another reference example of the support device.

[Explanation of symbols]

 Reference Signs List 1 carriage moving positioning device 5 carriage 11 carriage base 13 carriage guide 17 ball screw 21 nut member 23 servo motor 33 first support device 35 second support device

Continuation of the front page (56) References JP-A-2-137628 (JP, A) JP-A-2-72254 (JP, A) JP-A-63-163059 (JP, A) JP-A-5-29652 (JP) , U) Patent 130040 (JP, C1)

Claims (1)

(57) [Scope of request for utility model registration] 1. A movable carriage (5) is provided along a carriage guide (13) provided on a base (11), and is rotatable in parallel with the carriage guide (13) and on the base (11). Ball screw (1
7) a nut member (2) provided in the carriage (5).
1) is movably screwed into the nut member (2).
The carriage guide (1) is located at both sides of (1).
3) and movably supported by the ball screw (1).
7) In a carriage movement positioning device provided with first and second support devices for supporting the above (7), the support device is in contact with an outer peripheral surface of the ball screw (17), and a plurality of support rollers ( 63), the axis of each of the support rollers (63) is provided to be inclined with respect to the axis of the ball screw (17), and when the ball screw (17) rotates, the respective support rollers (63) A carriage movement positioning device characterized in that the support device is moved in the same direction as the movement direction of the carriage (5) along the carriage guide (13) by the driven rotation.