JP2003214519A - Two-stage feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a two-stage feeding device which realizes high speed movement and high thrust force without using an electric means and increases a capacity of a motor. <P>SOLUTION: The two-stage feeding device 1 stops integral rotation of a first case 3 and a first feed screw 2 by a rotation stop means 61 when a part 21 to be engaged and an engaging part 311 are not engaged with each other, and effects a first-stage moving operation of a second case 5 by moving a first case 3 and a second case 5 relative to the first feed screw 2 through thread engagement of a first nut part 31. The two-stage feeding device 1 also moves the second case 5 relative to a second feed screw 4 through integral rotation of the first case 3 and the first feed screw 2 when the part 21 to be engaged and the engaging part 311 are engaged with each other, to perform second-stage moving operation of the second case 5. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-stage feeding device that rotates a feed screw by a driving force of a motor to move a case screwed on the feed screw in two steps.

[0002]

2. Description of the Related Art For example, in a pressurizing device using a motor, a case screwed to the screw is moved by a feed screw rotated by the motor, the rotational force of the motor is converted into a thrust, and the case is applied by the case. Apply pressure. At this time, the part to be pressurized is usually far from the pressurizing device, and the capacity (power) of the motor moves the case during the moving time until the pressurization. Consumed by.

[0003]

By the way, the moving time until the pressurization in the above case is a wasteful time in which the direct pressurization work is not performed. Therefore, in order to reduce the useless time, it is necessary to increase the rotation speed of the motor or the lead pitch (feed pitch) of the feed screw to increase the moving speed of the case. On the other hand, when trying to obtain a large pressing force in the above case,
For example, it is necessary to reduce the rotational speed of the motor or the lead pitch of the feed screw to increase the thrust of the case.

However, the moving speed of the above case is
Generally, it is inversely proportional to the thrust in the above case. Therefore, in order to increase both the moving speed and the thrust, it is necessary to select a motor having a large capacity. In order to realize high-speed movement and high thrust, a method of controlling the rotation speed of the motor by using a servo motor for the motor or attaching an inverter to the motor may be considered. However, in such a method, it is necessary to newly add an electric means such as a servo or an inverter to the pressurizing device, which makes the electric control of the pressurizing device complicated.

The present invention has been made in view of the above conventional problems, and it is a two-stage structure that can realize high-speed movement and high thrust without using electric means and without increasing the capacity of the motor. It is intended to provide a feeding device.

[0006]

According to a first aspect of the present invention, there is provided a first feed screw which is rotated by a driving force of a motor and has an engaged portion, and a first nut portion which is screwed to the first feed screw. It has an engaging portion that engages with the engaged portion,
A first case that is movable with respect to the first feed screw by screwing the first nut portion when the feed screw is rotated, and is rotatable integrally with the first feed screw;
A second feed screw that is fixed to the first case, rotates integrally with the first case, and has a lead pitch different from that of the first feed screw; and a second screw screwed to the second feed screw.
When the second feed screw rotates, the nut portion has a nut portion, is movable with respect to the second feed screw by screwing the second nut portion, and is rotatable with respect to the second feed screw. A second case fixed to the first case and a rotation stopping means for stopping the integral rotation of the first case and the first feed screw, and the engaged portion and the engaging portion are engaged with each other. When not, while stopping the integral rotation of the first case and the first feed screw by the rotation stopping means,
By screwing the first nut portion, the first case and the second case are moved with respect to the first feed screw, and the first stage moving operation of the second case is performed to make the engaged case. The first case and the first feed screw are integrally rotated to move the second case with respect to the second feed screw when the portion and the engagement portion are engaged. The two-stage feeding device is characterized in that the second-stage moving operation of the second case is performed.

The present invention is a two-stage type feed device in which a feed screw and a case having a nut part are further added to a one-stage type feed device having one set of a feed screw and a case having a nut part. It is a device. Below, 2 of the present invention
The operation of the multi-stage feeding device will be described, and the operational effects obtained thereby will be described.

In the following description, the forward direction means the direction in which the second case moves away from the first feed screw, and the backward direction means the direction in which the second case approaches the first feed screw. Say. Further, the forward movement of the second case means the movement of the second case away from the first feed screw, and the backward movement means the movement of the second case toward the first feed screw.

The two-stage type feeding device of the present invention is provided with the first feed screw having the engaged portion as described above, the first case having the first nut portion and the engaging portion, and the first case. And a second case having the second nut portion and the rotation stopping means. Then, when the first feed screw is rotated by the motor, the first case is disengaged from the first screw depending on whether the engaged portion and the engaging portion are engaged with each other. It is determined whether to move or rotate integrally with the first feed screw.

That is, when the first feed screw is rotated by the motor, for example, when the engaged portion and the engaging portion are not engaged, the rotation stopping means causes the first case to rotate. The rotation of the first feed screw is stopped, and the first case is moved with respect to the first feed screw. At this time, the second fixed to the first case
The feed screw and the second case screwed to the second feed screw also move with respect to the first feed screw at the same time. In this way, the first stage movement operation of the second case is performed.

When the first case moves and the engaged portion and the engaging portion engage with each other, the rotation stop by the rotation stopping means is released and the first case is replaced by the first case. Rotate integrally with the feed screw. At this time, the first
The second feed screw fixed to the case rotates, and the second case moves with respect to the second feed screw. In this way, the second stage movement operation of the second case is performed.

It should be noted that the second lead screw has a lead pitch different from that of the first lead screw. Then, by determining the lead pitch of the first feed screw and the second feed screw according to the purpose of introducing the two-stage feed device, there are two stages of high-speed movement and low-speed movement of the second case. Can be realized.

That is, for example, when the lead pitch of the second feed screw is made smaller than the lead pitch of the first feed screw, the movement of the second case in the movement operation of the second stage is performed by the movement of the second case. Compared with the movement of the second case in the movement operation of the first stage, the movement is performed at a smaller speed. On the other hand, the thrust output by the second case in the movement operation of the second stage can exhibit a larger thrust than the thrust output by the second case in the movement operation of the first stage.

Further, from the opposite viewpoint, the movement of the second case in the movement operation of the first stage is performed at a higher speed than the movement of the second case in the movement operation of the second stage. be able to. On the other hand, the thrust output by the second case in the moving operation of the first step is smaller than the thrust output by the second case in the moving operation of the second step.

When the two-stage feeding device of the present invention is used as a pressurizing device for applying pressure when moving the second case in the forward direction, for example, the first-stage moving device is used. The movement is used when the second case moves until it comes close to the work to be pressurized, and the second stage movement operation causes the second case to actually press the work to be pressurized. Can be used at times. As a result, the high speed movement and low thrust of the second case can be realized during movement, and the low speed movement and high thrust of the second case can be achieved during pressurization.

As described above, by combining the two kinds of feed screws having different lead pitches, it is possible to realize the moving speed and the thrust in two stages in the second case. Therefore, it is possible to realize the high speed movement and high thrust of the second case without increasing the capacity of the motor.

Further, according to the present invention, the high speed movement and high thrust of the second case can be realized by a mechanical structure without using electric means such as a servo or an inverter. Therefore, the electric control of the two-stage feeding device is not complicated. Therefore, according to the present invention, the high speed movement and the high thrust of the second case can be realized without using electric means and without increasing the capacity of the motor.

According to a second aspect of the present invention, a first feed screw rotated by a driving force of a motor and a first feed screw screwed to the first feed screw.
When the first feed screw rotates, it has a nut portion, is movable with respect to the first feed screw by screwing of the first nut portion, and is integrally formed with the first feed screw. A rotatable first case, a second case fixed to the first case and rotatable integrally with the first case, having a lead pitch different from that of the first feed screw and having an engaged portion. A feed screw, a second nut portion screwed to the second feed screw, and an engaging portion that engages with the engaged portion. When the second feed screw rotates, A second case that is movable with respect to the second feed screw by screwing the second nut portion and is fixed in rotation with respect to the second feed screw; the first case; and the first feed screw. And an unifying means for unifying When the mating portion is not engaged, the first case and the first feed screw are integrally rotated by the integrating means to move the second case with respect to the second feed screw. Then, the first stage moving operation of the second case is performed, and when the engaged portion and the engaging portion are engaged, the first feed screw is moved with respect to the first case. The first case and the second case are moved with respect to the first feed screw by screwing the first nut portion, and the second stage movement operation of the second case is performed. A two-stage feeding device having the above structure is provided (claim 6).

The present invention is also a two-stage type in which a feed screw and a case having a nut portion are further added to a one-stage type feed device having one set of a feed screw and a case having a nut portion. It is a feeder. The operation of the two-stage feeding device of the present invention will be described below, and the operational effects obtained thereby will be described. The two-stage feeding device of the present invention comprises the first feed screw as described above, the first case having the first nut portion, the second feed screw fixed to the first case and having the engaged portion, A second case having an engaging portion and a second nut portion and the above-mentioned integrating means are provided.

Then, when the first feed screw is rotated by the motor, the first case causes the first case to move depending on whether the engaged portion and the engaging portion are engaged with each other.
It is determined whether to move with respect to the feed screw or rotate integrally with the first feed screw. That is, when the first feed screw is rotated by the motor, for example, when the engaged portion and the engaging portion are not engaged with each other, the unifying means causes the first case and the first case to rotate. The first case and the first feed screw are integrally rotated to move the second case with respect to the second feed screw. Thus, the first of the second case
The movement operation of the tier is performed.

When the second case moves and the engaged portion engages with the engaging portion, the integration by the integrating means is released and the first case is replaced by the first case.
Move with respect to the lead screw. At this time, the second feed screw fixed to the first case and the second case screwed to the second feed screw also move with respect to the first feed screw at the same time. In this way, the second stage movement operation of the second case is performed.

It should be noted that the second lead screw has a lead pitch different from that of the first lead screw. Then, by determining the lead pitch of the first feed screw and the second feed screw according to the purpose of introducing the two-stage feed device, there are two stages of high-speed movement and low-speed movement of the second case. Can be realized. Also in the two-stage feeding device of the present invention, similarly to the above-mentioned invention, it is possible to realize the high-speed movement and high thrust of the second case without increasing the capacity of the motor.

Also according to the present invention, the high speed movement and high thrust of the second case can be realized by a mechanical structure without using electric means such as a servo or an inverter. Therefore, the electric control of the two-stage feeding device is not complicated. Therefore, also according to the present invention, it is possible to realize the high speed movement and high thrust of the second case without using electric means and without increasing the capacity of the motor.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The preferred embodiments of the present invention described above will be described. In the first and second inventions, the two-stage feeding device can be used as a pressurizing unit in a press device for pressurizing a work to be pressed. In addition to this, the above 2
The multi-stage feed device can be used as a press-fitting unit in a press-fitting device for press-fitting a press-fitting work into another work, and is also capable of deforming a caulking work to crimp another work. It can also be used as a caulking unit in the device. In any of the above cases, the two-stage feeding device can be configured as a unit that is smaller in size and excellent in maintenance and the like than a pressurizing device that uses hydraulic pressure.

Further, according to the two-stage type feed device, by setting the lengths of the first feed screw and the second feed screw according to the use, the two-stage moving distance of the second case can be obtained. Each can be set optimally. Also,
At least one of the first nut portion and the second nut portion holds a plurality of balls on an inner peripheral surface facing the outer peripheral surface of the first feed screw or the second feed screw, respectively, and holds the first feed. It may be a screw or a ball screw nut screwed to the second feed screw. And the first
At least one of the feed screw and the second feed screw may be a ball screw that is screwed into the ball screw nut. In this case, the ball screw nut can move with respect to the ball screw with rolling of the plurality of balls.

The motor can be attached to the first feed screw via various speed reducing means. For example, the deceleration means can be formed by attaching pulleys having different diameters to the output shaft of the motor and the end portion of the first feed screw, and connecting the pulleys with a belt. The speed reducing means may be formed by using a chain and a sprocket or a pair of gears instead of the pulley and the belt.

Further, in the first aspect of the present invention, in the two-stage feeding device, when the engaged portion is provided at the tip of the first feed screw, the first case moves to the forward end. It is preferable that the engaged portion and the engaging portion are engaged with each other. In this case, the engaged portion and the engaging portion can be easily provided so that the engagement is performed after the first case moves to the forward end. Then, as a result of the first stage forward movement of the second case due to the movement of the first case with respect to the first feed screw, the engaged portion is moved after the first case has moved to the forward end. And the engaging portion are engaged with each other, and the second stage forward operation of the second case is performed by the integral rotation of the first case and the first feed screw.

The tip of the first feed screw refers to the end of the first feed screw on the side that does not receive the driving force from the motor. The state in which the first case has moved to the forward end refers to the state in which the first case has been fed to the tip of the first feed screw. Further, the state in which the first case has moved to the retracted end means a state in which the first case is closest to the end of the first feed screw on the side receiving the driving force from the motor.

The state in which the second case has moved to the forward end means that the second case has been fed to the end of the second feed screw that is not fixed to the first case. Say. The state in which the second case has moved to the retracted end refers to the state in which the second case is closest to the end of the second feed screw on the side fixed to the first case.

The rotation stopping means makes the frictional resistance between the second feed screw and the second nut portion larger than the frictional resistance between the first feed screw and the first nut portion. It is preferable that the above-mentioned configuration is adopted (claim 3). In this case, the rotation stopping means can be easily formed with a simple structure without providing a special device or the like.

Further, in this case, when the first feed screw is rotated when the engaged portion and the engaging portion are not engaged, the second feed screw and the second nut portion are Since the frictional resistance between the first feed screw and the first nut portion is larger than the frictional resistance between the first feed screw and the first nut portion, the first feed screw and the first nut portion start relative movement first. Therefore, after the first stage moving operation of the second case is performed by the movement of the first case with respect to the first feed screw, the engaged portion and the engaging portion are engaged with each other, The second stage movement operation of the second case is performed by the integral rotation of the first case and the first feed screw.

Further, it is preferable that the second lead screw has a smaller lead pitch than the first lead screw (claim 4). In this case, the moving speed of the second case in the second-stage moving operation by the integral rotation of the first case with the first feed screw depends on the movement of the first case with respect to the first feed screw. The moving speed can be set lower than the moving speed of the second case in the moving operation of the first stage.

Therefore, high speed movement and low thrust of the second case are realized during the first stage moving operation, and low speed movement and high thrust of the second case are achieved during the second stage moving operation. Thrust can be realized. Further, in this case, when the two-stage feeding device is configured such that the second-stage moving operation is performed after the first-stage moving operation, the second case moves at high speed. High thrust can be output after performing.

Further, in the two-stage type feeding device, when the first case moves to the retracted end, the first case and the first case move.
It is preferable to have an unifying means for unifying with the feed screw (Claim 5). In this case, when performing the backward movement of the second case, the first case and the first feed screw are integrated by the integrating means after the first case moves to the backward end. These can be rotated integrally.

More specifically, in this case, when the first case and the second case move from the forward end to the backward end respectively, first, the rotation stopping means causes the first case and the second case to move. The rotation integrally with the first feed screw is stopped, the first case moves to the retreat end with respect to the first feed screw, and the retreat operation for retreating the second case is performed. After that, the first case and the first feed screw are integrated by the integration means, the first case and the first feed screw are integrally rotated, and the second feed screw is rotated. Then, a retreat operation for further retracting the second case is performed.

Further, in the second aspect of the invention, in the two-stage feeding device, when the engaged portion is provided at the tip of the second feed screw, when the second case moves to the forward end. It is preferable that the engaged portion and the engaging portion are engaged with each other.

In this case, the engaged portion and the engaging portion can be easily provided so that the engagement is performed after the second case moves to the forward end. As a result, the first case forward movement of the second case due to the integral rotation of the first case with the first feed screw causes the second case to move to the forward end, and then The engaged portion and the engaging portion are engaged with each other, and the second stage forward movement operation of the second case is performed by the movement of the first case with respect to the first feed screw. The tip of the second feed screw is the first lead screw in the first feed screw.
The end that is not fixed to the case.

Further, the integrating means makes the frictional resistance between the first feed screw and the first nut portion larger than the frictional resistance between the second feed screw and the second nut portion. It is preferable to configure the above (Claim 8). in this case,
The integrated means can be easily formed with a simple structure without providing a special device or the like.

Further, in this case, when the first feed screw is rotated when the engaged portion and the engaging portion are not engaged, the first feed screw and the first nut portion are Since the frictional resistance between them is larger than the frictional resistance between the second feed screw and the second nut portion, the second feed screw and the second nut portion start relative movement first. Therefore, after the first stage moving operation of the second case is performed by the integral rotation of the first case and the first feed screw, the engaged portion and the engaging portion are engaged. Combined, the first
The second by moving the case with respect to the first feed screw
The movement operation of the second stage of the case is performed.

Further, it is preferable that the second feed screw has a larger lead pitch than the first feed screw (claim 9). In this case, the moving speed of the second case in the movement operation of the second stage by the movement of the first case with respect to the first feed screw depends on the rotation integrally with the first feed screw of the first case. It is possible to make the speed higher than the moving speed of the second case in the moving operation of the first stage.

Therefore, high speed movement and low thrust of the second case are realized during the first stage moving operation, and low speed movement and high thrust of the second case are achieved during the second stage moving operation. Thrust can be realized. Further, in this case, when the two-stage feeding device is configured such that the second-stage moving operation is performed after the first-stage moving operation, the second case moves at high speed. High thrust can be output after performing.

Further, the two-stage type feed device has a rotation stopping means for stopping the integral rotation of the first case and the first feed screw when the second case moves to the retracted end. Preferably (claim 10). In this case, when performing the backward movement of the second case, the second case
After the case moves to the retracted end, the rotation stopping means can stop the integral rotation of the first case and the first feed screw.

More specifically, in this case, when the first case and the second case are respectively moved from the forward end to the backward end, first, the integrating means is used to move the first case and the second case. The first feed screw rotates integrally with the first feed screw, the second case moves to the retreat end with respect to the second feed screw, and the retreat operation for retreating the second case is performed. Then, the rotation stopping means stops the integral rotation of the first case and the first feed screw, moves the first case with respect to the first feed screw, and further retracts the second case. The second-stage retreat operation is performed.

Further, in the above first and second inventions,
The two-stage feeding device preferably has a first guide for guiding the movement and rotation of the first case (claim 11). In this case, the first case can be stably moved and rotated by being guided by the first guide. Therefore, the accuracy of the moving position of the second case can be improved.

When the two-stage feeding device has the first guide, the first case has a circular cross section, and the first guide has the first case inserted therein. It is preferable that the first case is movable and rotatable with respect to the first guide (claim 12). In this case, the first case can be easily moved and rotated with respect to the first guide, and the accuracy of the moving position of the second case can be easily improved.

Further, the two-stage feeding device has a second guide for guiding the movement of the second case.
Rotation of the case is preferably fixed by the second guide (claim 13). In this case, the second guide can easily guide the movement of the second case and can easily stop the rotation of the second case. Also, the accuracy of the moving position of the second case can be improved by the second guide.

[0047]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) As shown in FIGS. 1 to 5, the two-stage feeding device 1 according to the present embodiment is different from the one-stage feeding device including one set of a feed screw and a case having a nut portion in This is configured by adding a feed screw and a case having a nut portion. That is, the two-stage feed device 1 of this example has the following first feed screw 2, first case 3, second feed screw 4, second case 5 and rotation stopping means 61.

As shown in FIG. 1, the first feed screw 2
Is rotated by the driving force of the motor 7 and the engaged portion 2
Have one. The first case 3 is the same as the first case.
It has a first nut portion 31 screwed to the feed screw 2 and an engaging portion 311 that engages with the engaged portion 21. The first case 3 is movable with respect to the first feed screw 2 by screwing the first nut portion 31 when the first feed screw 2 is rotated, and the first feed screw 2 is also moved. It is configured to be rotatable integrally with.

The second feed screw 4 is fixed to the first case 3, rotates integrally with the first case 3, and has a lead pitch (feed pitch) different from that of the first feed screw 2. is doing. In addition, the second case 5 is
It has a second nut portion 51 screwed into the second feed screw 4. The second case 5 is configured to be movable with respect to the second feed screw 4 by screwing the second nut portion 51 when the second feed screw 4 is rotated. In addition, the second case 5 includes the second feed screw 4 described above.
The rotation is fixed against. The rotation stopping means 61 is configured to stop the integral rotation of the first case 3 and the first feed screw 2.

The two-stage feeding device 1 includes the engaged portion 2
1 and the engaging portion 311 are not engaged (see FIG.
), The first case 3 by the rotation stopping means 61.
And the first rotation of the first feed screw 2 are stopped, and the first case 3 and the second case 5 are moved with respect to the first feed screw 2 by screwing the first nut portion 31. (See FIG. 2), the second stage 5 is configured to perform the first stage movement operation. In addition, the two-stage feeding device 1 includes the engaged portion 21 and the engaging portion 311.
When and are engaged (see FIG. 2), the first case 3 and the first feed screw 2 are integrally rotated to move the second case 5 relative to the second feed screw 4. The second case 5 is moved (see FIG. 3) to perform the second stage movement operation of the second case 5.

This will be described in detail below. As shown in FIG. 1, in this example, the forward direction means a direction in which the second case 5 is separated from the first feed screw 2, and the backward direction means that the second case 5 causes the second case 5 to move. The direction to approach. The forward movement of the second case 5 refers to the movement of the second case 5 away from the first feed screw 2, and the backward movement refers to the movement of the second case 5 toward the first feed screw 2. Refers to operation.

The state in which the first case 3 has moved to the forward end means that the first case 3 has the first feed screw 2
205, that is, the forward side end 205 on the side of the first feed screw 2 that does not receive the driving force from the motor 7.
It is in the state of being sent up to. In addition, the above first case 3
The state in which the first case 3 has moved to the retreat end is the state in which the first case 3 is closest to the retreat side end portion 206 on the side where the driving force from the motor 7 is received in the first feed screw 2.

The state in which the second case 5 has moved to the forward end means that the second case 5 has the second feed screw 4
405, that is, the forward feed side end portion 4 of the second feed screw 4 which is not fixed to the first case 3.
It is in the state where it has been sent up to 05. The state in which the second case 5 has moved to the retracted end means that the second case 5 has
Means that the second feed screw 4 is closest to the retracted side end portion 406 on the side fixed to the first case 3.

The two-stage feeding device 1 of this embodiment is used as a pressurizing device for applying pressure when moving the second case 5 in the forward direction. In this example, the second feed screw 4 has a smaller lead pitch than the first feed screw 2. Therefore, the movement of the second case 5 in the second-stage movement operation by the integral rotation of the first case 3 with the first feed screw 2 is performed by the first feed screw 2 of the first case 3. Is performed at a speed smaller than that of the movement of the second case 5 in the movement operation of the first stage by the movement with respect to.

In the present example, the movement operation of the first stage is used when the second case 5 moves until it approaches a workpiece (not shown) to be pressed, and the movement of the second stage is performed. The operation is used when the second case 5 actually pressurizes the workpiece to be pressurized. Further, in this example, the length of the first feed screw 2 is made longer than the length of the second feed screw 4, and the movement stroke of the second case 5 in the movement operation of the first step is It is set to be longer than the movement stroke of the second case 5 in the movement operation of the second stage.

A flange portion 84 for attaching the two-stage type feed device 1 to the frame 80 of the pressurizing device and the first feed screw 2 are rotatably supported by the first guide 81 via a bearing 821. And a connection plate 83 for connecting the rotation support portion 82 and the motor 7 to each other.
And are fixed.

Further, in this example, the motor 7 is configured to transmit the driving force to the first feed screw 2 through the speed reducing means including the belt 73 and the pair of pulleys 71 and 72. More specifically, a first pulley 71 having a small diameter is attached to the output shaft of the motor 7, and a second pulley having a diameter larger than that of the first pulley 71 is attached to an end portion of the first feed screw 2.
A pulley 72 is attached, and a belt 73 connects them. In this way, the rotation speed of the motor 7 is reduced to rotate the first feed screw 2.

Further, the motor 7 is capable of normal rotation and reverse rotation, and when the first feed screw 2 is normally rotated by the motor 7, the first case 3 feeds the first case 3 in the forward direction, When the reverse rotation is performed by 7, the first case 3 is returned in the backward direction.

Further, the rotation stopping means 61 includes the second
The frictional resistance between the feed screw 4 and the second nut portion 51 is made larger than the frictional resistance between the first feed screw 2 and the first nut portion 31. Thus, when the engaged portion 21 and the engaging portion 311 are not engaged with each other, when the first feed screw 2 rotates, the first case 3 and the first feed screw 2 are It is possible to stop the integral rotation of the first case 3 and move the first case 3 with respect to the first feed screw 2.

Further, in this example, the first nut portion 31 and the second nut portion 51 respectively have inner peripheral surfaces facing the outer peripheral surfaces 208 and 408 of the first feed screw 2 or the second feed screw 4, respectively. A ball screw nut that holds a plurality of balls in 308 and 508 and is screwed into the first feed screw 2 or the second feed screw 4. The ball screw nuts are respectively attached to the first case 3 and the second case 5 described above.
It is fixed to.

According to the ball screw nut, the frictional resistance can be mainly due to the rolling resistance, and the frictional resistance can be reduced. In addition, the first
The feed screw 2 and the second feed screw 4 are ball screws into which the ball screw nuts are screwed.

In this example, the balls used for the second nut portion 51 are of a size larger than the standard size, and the second feed screw 4 and the second nut portion 5 are used.
The frictional resistance between the first feed screw 2 and the first nut portion 31 is greater than the frictional resistance between the first feed screw 2 and the first nut portion 31. In addition to this, the same state as above can be formed by increasing the preload applied to the ball in the second nut portion 51 above a standard value.

The two-stage feeding device 1 of this example has a first guide 81 for guiding the movement and rotation of the first case 3. In this example, the first guide 81 has a circular hole into which the first case 3 is inserted and arranged, and the first case 3 has a circular cross section. The first case 3 has a cylindrical shape including a bottom portion 32 located on the forward side and a side wall portion 33 erected from the bottom portion 32. A hollow portion 331 is formed inside the side wall portion 33. The first nut portion 31 is fixed to the first case 3 such that a part of the first nut portion 31 is arranged in the hollow portion 331 of the first case 3. In this way, the first case 3 is movable and rotatable with respect to the first guide 81, and the first case 3 is guided by the first guide 81 to perform stable movement and rotation. it can.

The engaged portion 21 is provided on the tip portion 205 of the first feed screw 2. In addition, in the first feed screw 2, the retreat side end portion 206 of the first feed screw 2 has the rotation support portion 8
It is supported by 2. The portion including the engaged portion 21 and the tip portion 205 of the first feed screw 2 is arranged inside the hollow portion 331 of the first case 3.

The engaged portion 21 is a locking claw formed on the retracting side surface 202 located in the retracting direction, and the first nut portion 31 is formed on the advancing side surface 301 located in the advancing direction as the engaging portion 311. It has a locked claw 211 that abuts against the surface 312. The lock pawl 312 comes into contact with the locked pawl 211 when the first case 3 moves to the forward end by the forward rotation of the first feed screw 2 (see FIG. 2). When the first case 3 is retracted by the reverse rotation of the first feed screw 2, the contact with the locked claw 211 is separated (see FIG. 4). In this way, the engagement and disengagement between the engaged portion 21 and the engaging portion 311 are performed.

As described above, the first case 3 is moved forward by the first step of moving the second case 5 by moving the first case 3 with respect to the first feed screw 2.
Is moved to the forward end, the engaged portion 21 and the engaging portion 311 engage with each other (see FIG. 2), and the first case 3 and the first feed screw 2 are integrated with each other. The forward movement of the second stage of the second case 5 by rotation is performed (see FIG. 3).

Further, the two-stage feeding device 1 is the same as the first
When the case 3 moves to the retracted end (see FIG. 4), it has an unifying means 62 for unifying the first case 3 with the first feed screw 2. In this example, this integration means 6
2 is a stopper 621 made of synthetic resin and the engaged portion 2
It is constituted by engaging with 1. That is, the stopper 621 is provided on the retracted side surface (the surface on the hollow portion 331 side) 321 of the bottom portion 32 of the first case 3, and when the first case 3 retracts, the engaged portion 21 of the engaged portion 21 moves. It contacts the advancing side surface 201.

When this contact is made, the first
Due to the reverse rotation of the feed screw 2, the force with which the first case 3 further retracts acts as a frictional force between the stopper 621 and the forward side surface 201 of the engaged portion 21, and the first case 3 The first feed screw 2 can be integrated and rotated.

The second feed screw 4 is threaded in the same direction as the first feed screw 2. Then, for example, when the first case 3 and the first feed screw 2 are integrally rotated in response to the normal rotation of the motor 7, the second case
The case 5 is designed to move forward. The second feed screw 4 is fixed to the bottom portion 32 of the first case 3.

Further, as shown in FIG. 5, the two-stage feeding device 1 has a second guide 85 for guiding the movement of the second case 5, and the second case 5 has the second guide 85. The rotation is fixed by. That is, in this example, the second guide 85 has the shafts 852 inserted into the slide cases 851 fixed to the first guide 81, and one end of the shaft 852 is attached to the second case. 5 is attached to form. Further, the slide case 851 includes the shaft 85
A ball bush formed by holding a plurality of balls on an inner peripheral surface 853 facing the second outer peripheral surface 854 is used.

The tip portion 405 of the second feed screw 4 is also used.
When the second case 5 moves forward (see FIG. 3), the second case 5 comes into contact with the second case 5 to prevent the second case 5 from coming off the second feed screw 4. A section 41 is provided. In addition, in the present example, the disengagement prevention portion 41 is the second nut portion 5 provided in the second case 5.
Abut 1.

Further, as shown in FIG. 1, the second case 5 also has a hollow portion 531 like the first case 3. The second nut portion 51 is fixed to the second case 5 such that a part of the second nut portion 51 is arranged in the hollow portion 531. Then, the detachment prevention portion 41
And a portion including the tip portion 405 of the second feed screw 5 is
It is arranged inside the hollow portion 531 in the second case 5.

Next, the movement and pressurizing operation by the above-mentioned two-stage feeding device 1 and the function and effect obtained by these operations will be described. Here, as shown in FIG. 1, both the first case 3 and the second case 5 have returned to the retracted ends, and the position where the second case 5 is most retracted is the original position.

In this example, the two-stage feeding device 1 is used as a pressurizing device as described above. Then, after setting a work (not shown) to be pressed on a jig (not shown), the two-stage feeding device 1 is operated. That is, first, after setting the work, the motor 7 is normally rotated, and the first feed screw 2 is normally rotated via the pair of pulleys 71 and 72 and the belt 73.

At this time, the engaged portion 21 and the engaging portion 31
Since the first case 3 is not engaged with the first feed screw 2, the first case 3 is rotated integrally with the first feed screw 2 or the first nut portion 31 is screwed with the first feed screw 2. Try to move forward. Here, in the present example, as described above, the second nut portion 5 is used as the rotation stopping means 61.
1 and the coefficient of friction between the second lead screw 4 and the first
The friction coefficient between the nut portion 31 and the first feed screw 2 is made larger.

Therefore, the rotation of the first case 3 with respect to the first feed screw 2 is stopped, and the first case 3 advances with respect to the first feed screw 2. At this time,
The second feed screw 4 fixed to the first case 3 and the second case 5 screwed to the second feed screw 4 also move forward with respect to the first feed screw 2 at the same time. Thus, the second
The forward movement of the first stage of Case 5 is performed (see FIG. 2).

Then, as shown in FIG. 2, when the first case 3 advances to the forward end, the engaged portion 21 provided on the first feed screw 2 and the first nut of the first case 3 are engaged. The part 31 is engaged. At this time, due to this engagement, the rotation stop by the rotation stopping means 61 is released, that is, due to this engagement, the torque by the motor 7 causes the frictional resistance between the second nut portion 51 and the second feed screw 4. The first case 3 and the first feed screw 2 integrally rotate in the forward direction. Then, at this time, the second feed screw 4 fixed to the first case 3 is provided.
Rotates forward, and the second case 5 advances with respect to the second feed screw 4. In this way, the second stage forward movement of the second case 5 is performed (see FIG. 3). Then, during the forward movement of the second step, the work is pressurized.

Then, as shown in FIG. 3, after pressurizing the work, the motor 7 is rotated in the reverse direction to move the first feed screw through the pair of pulleys 71 and 72 and the belt 73. Rotate 2 in reverse. Then, the rotation stopping means 61 stops rotation of the first case 3 with respect to the first feed screw 2, and the first case 3 retracts with respect to the first feed screw 2. At this time, the second feed screw 4 fixed to the first case 3 and the second feed screw 4
The second case 5 screwed to the feed screw 4 is also the same as the first case described above.
Retreat with respect to the feed screw 2. In this way, the backward movement of the first stage of the second case 5 is performed (see FIG. 4).

Next, as shown in FIG. 4, when the first case 3 is retracted to the retracted end, the stopper 621 provided on the bottom portion 32 of the first case 3 causes the first case 3 to retreat.
It abuts on the advancing side surface 201 of the engaged portion 21 provided on the tip portion 205 of the feed screw 2. Then, the integration means 6
2, a frictional force acts between the stopper 621 and the advancing side surface 201 of the engaged portion 21, and the first case 3 and the first feed screw 2 are integrated. Then, the first case 3 rotates integrally with the first feed screw 2 in the reverse direction.

At this time, the second feed screw 4 fixed to the first case 3 rotates in the reverse direction, and the second case 5 retracts with respect to the second feed screw 4. In this way, the backward movement of the second stage of the second case 5 is performed, and the second case 5 returns to the original position (see FIG. 1).

In this example, as described above, the second feed screw 4 has a smaller lead pitch than the first feed screw 2. Therefore, the forward movement of the second case 5 in the forward movement of the second stage is performed at a smaller speed than the forward movement of the second case 5 in the forward movement of the first stage. On the other hand, the thrust output by the second case 5 in the forward movement of the second stage can exhibit a larger thrust than the thrust output by the second case 5 in the forward movement of the first stage. .

Further, from the opposite viewpoint, the forward movement of the second case 5 in the first forward movement is larger than that of the second case 5 in the second forward movement. Can be done at. On the other hand, the thrust output by the second case 5 in the first forward movement is smaller than the thrust output by the second case 5 in the second forward movement.

When the two-stage feeding device 1 is used as the pressurizing device, the forward movement of the first stage is moved until the second case 5 approaches the work to be pressurized. The second stage forward movement can be used at the time of pressurization in which the second case 5 actually pressurizes the work to be pressed. As a result, it is possible to realize the high speed movement and the low thrust of the second case 5 during the movement, and the low speed movement and the high thrust of the second case 5 during the pressurization.

As described above, by combining the two kinds of feed screws having different lead pitches, it is possible to realize the moving speed and the thrust in two steps in the second case 5. Therefore, it is possible to realize high-speed movement and high thrust of the second case 5 without increasing the capacity of the motor 7.

According to the two-stage feeding device 1 of this example,
A high speed movement and high thrust of the second case 5 can be realized by a mechanical structure without using electric means such as a servo or an inverter. Therefore, the above 2
It does not complicate the electric control of the multi-stage feeding device 1. Therefore, according to the two-stage feeding device 1 of this example, it is possible to realize high-speed movement and high thrust of the second case 5 without using electric means and without increasing the capacity of the motor 7. it can.

(Embodiment 2) As shown in FIGS. 6 to 9, the two-stage feeding device 1 of this embodiment is different from the two-stage feeding device 1 of the first embodiment in that the second case 5 Is performed when the first case 3 and the first feed screw 2 are integrally rotated, and the second case 5 is moved to the second stage.
The moving operation of the step is performed when the first case 3 is moved with respect to the first feed screw 2. And
As shown in FIG. 6, in the present example, the engaged portion 21
Is not provided on the first feed screw 2, but is provided on the second feed screw 4 to be the engaged portion 45, and the engaging portion 311 is not provided on the first case 3 but the second feeding screw 4.
The engaging portion 511 is provided on the case 5.

That is, the first feed screw 2 of this example is constructed so as to be rotated by the driving force of the motor 7. Further, the first case 3 of this example has a first nut portion 31 screwed into the first feed screw 2. The first case 3 is movable with respect to the first feed screw 2 by screwing the first nut portion 31 when the first feed screw 2 is rotated, and the first feed screw 2 is also moved. It is configured to be rotatable integrally with.

The second feed screw 4 of this example is the same as the first lead screw 4 described above.
It is fixed to the case 3 and is configured so as to be rotatable integrally with the first case 3.
Has a lead pitch different from that of the engaged portion 45.
have. In addition, the second case 5 of this example is the same as the second case described above.
It has a second nut portion 51 screwed to the feed screw 4 and the engaging portion 511 that engages with the engaged portion 45. The second case 5 has the second feed screw 4
It is configured to be movable with respect to the second feed screw 4 by screwing of the second nut portion 51 when rotating. The rotation of the second case 5 is fixed with respect to the second feed screw 4. Further, the unifying means 65 of this example is configured to unify the first case 3 and the first feed screw 2.

In the two-stage feeding device 1 of this example, when the engaged portion 45 and the engaging portion 511 are not engaged (see FIG. 6), the first means is operated by the integrating means 62. Case 3
And the first feed screw 2 are integrally rotated to move the second case 5 with respect to the second feed screw 4 (see FIG. 7), and the first stage of the second case 5 is moved. Is configured to perform the moving operation of the. Further, in the two-stage feeding device 1 of this example, when the engaged portion 45 and the engaging portion 511 are engaged with each other (see FIG. 7), the first feed screw 2 is moved to the first position. The first case 3 and the second case 5 are moved relative to the first feed screw 2 by rotating the case 3 by screwing the first nut portion 31 (see FIG. 8), It is configured to perform the second stage movement operation of the second case 5.

This will be described in detail below. Also in this example, the forward and backward directions and the forward and backward movements of the second case 5 are defined in the same manner as in the first embodiment. The definitions of the forward end and the backward end of the first case 3 and the forward end and the backward end of the second case 5 are the same as in the first embodiment.

As shown in FIG. 6, the two-stage feeding device 1 of this embodiment is also used as a pressurizing device for applying pressure when moving the second case 5 in the forward direction. In this example, the second feed screw 4 is the same as the first feed screw 2
Has a larger lead pitch. Therefore, the movement of the second case 5 in the second stage movement operation by the movement of the first case 3 with respect to the first feed screw 2 is performed integrally with the first feed screw 2 of the first case 3. It is performed at a speed smaller than the movement of the second case 5 in the movement operation of the first stage due to various rotations.

Also in this example, the movement operation of the first stage is used when the second case 5 moves until it approaches the work (not shown) to be pressed, and the second stage 5 is moved. The moving operation is used during pressurization in which the second case 5 actually pressurizes the work to be pressed. Also, in this example,
The length of the second feed screw 4 is made longer than the length of the first feed screw 2, and the movement stroke of the second case 5 in the movement operation of the first step is the second step. It is set to be longer than the moving stroke of the second case 5 in the moving operation.

Further, the unifying means 65 changes the frictional resistance between the first feed screw 2 and the first nut portion 31 to the friction between the second feed screw 4 and the second nut portion 51. It is configured by making it larger than the resistance. Accordingly, when the engaged portion 45 and the engaging portion 511 are not engaged with each other, when the first feed screw 2 rotates,
The first case 3 and the first feed screw 2 can be integrated to rotate the first case 3 integrally with the first feed screw 2.

In this example, the balls used for the first nut portion 31 are of a size larger than the standard size, and the first feed screw 2 and the second nut portion 3 are used.
The frictional resistance between the first feed screw 4 and the second nut portion 51 is larger than the frictional resistance between the second feed screw 4 and the second nut portion 51. In addition to this, the same state as described above can be formed by increasing the preload applied to the ball in the first nut portion 31 above a standard value.

The engaged portion 45 provided on the second feed screw 4 is provided on the tip portion 405 of the second feed screw 4. The engaged portion 45 has a locking claw 512 formed on the retracting side surface 402 located in the retracting direction, and a lock claw 512 formed on the advancing side surface 501 located in the advancing direction as the engaging portion 511 in the second nut portion 51. It has a locked claw 451 that abuts.

The lock claw 512 comes into contact with the locked claw 451 when the second case 5 moves to the forward end by the forward rotation of the second feed screw 4 (see FIG. 7). , When the second case 5 is retracted by the reverse rotation of the second feed screw 4, the locked claw 451
The contact with is separated (see FIG. 9). In this way, the engagement and disengagement between the engaged portion 45 and the engaging portion 511 are performed.

Further, as described above, by the forward movement of the first case of the second case 5 by the integral rotation of the first case 3 with the first feed screw 2, the second case 5 is moved. Is moved to the forward end (see FIG. 7), the engaged portion 45 and the engaging portion 511 are engaged with each other, and the second portion
The second stage forward movement of the second case 5 is performed by the movement of the case 5 with respect to the second feed screw 4 (see FIG. 8).

Further, the two-stage feeding device 1 has the second
It has a rotation stopping means 66 for stopping the integral rotation of the first case 3 and the first feed screw 2 when the case 5 moves to the retracted end (see FIG. 9). In this example, the rotation stopping means 66 is configured by engaging a stopper 661 made of synthetic resin provided on the first case 3 with the retracted side surface 502 of the second case 5. That is, the stopper 661 is provided on the advancing side surface 325 of the bottom portion 32 of the first case 3,
When the second case 5 is retracted, the retracted side surface 50
Abut 2.

At the time of this abutment, the force that causes the first case 3 to rotate further integrally with the first feed screw 2 due to the reverse rotation of the first feed screw 2 is applied to the stopper 661 and the It acts as a frictional force between the retreating side surface 502 of the second case 5 and the first case 3 and the second case 5 are integrated with each other, and they can be retracted with respect to the first feed screw 2. it can.

Further, as shown in FIG. 6, the tip portion 205 of the first feed screw 2 comes into contact with the first case 3 when the first case 3 moves forward, so that the first case 3 is brought into contact with the first case 3. A detachment prevention portion 25 is provided to prevent the detachment from the first feed screw 2. In addition, in the present example, the disengagement prevention portion 25 corresponds to the first nut portion 3 provided in the first case 3.
Abut 1. Other configurations are the same as those in the first embodiment.

Regarding the movement and pressurizing operation by the two-stage feeding device 1 of this embodiment, the two-stage feeding device of the first embodiment is different except that the operations associated with the unifying means 65 and the rotation stopping means 66 are different. It is the same as the type feeder 1.

In this example, as described above, the second feed screw 4 has a larger lead pitch than the first feed screw 2. Then, the forward movement of the first stage is used when the second case 5 moves until it approaches the workpiece to be pressurized, and the forward movement of the second stage is performed by the second case 5 It can be used when the target work is actually pressed. As a result, it is possible to realize the high speed movement and the low thrust of the second case 5 during the movement, and the low speed movement and the high thrust of the second case 5 during the pressurization.

Therefore, similar to the two-stage feeding device 1 of the first embodiment, it is possible to realize high speed movement and high thrust of the second case 5 without using the motor 7 having a large capacity. Further, also by the two-stage feeding device 1 of the present example, it is possible to realize high-speed movement and high thrust of the second case 5 by a mechanical structure without using electric means such as a servo or an inverter. Therefore, the electric control of the two-stage feeding device 1 is not complicated.

Therefore, even with the two-stage feeding device 1 of this embodiment, high speed movement and high thrust of the second case 5 are realized without using electric means and without increasing the capacity of the motor 7. be able to. In addition, it is possible to obtain the same effect as that of the first embodiment.

(Embodiment 3) In this embodiment, the performance of the conventional one-stage feeding device (comparative product, not shown) is compared with the performance of the two-stage feeding device 1 (invention product) shown in the first embodiment. And compared. Table 1 shows the moving speed (mm / mm) in the forward movement of the first stage (during movement) and the forward movement of the second stage (during pressurization) for the invention product and the comparative product.
An example of calculated values of s) and thrust (kN) is shown.

[0106]

[Table 1]

As shown in the table, in the comparative product, when a motor having a capacity of 500 (W) was used, the moving speed was 200 (mm) in the forward movement of the first stage.
/ S), and the thrust is 5 (kN). Further, the comparative product is the same in the forward movement of the second stage, the moving speed is 200 (mm / s), and the thrust is 5 (kN).
Becomes

Regarding the above-mentioned invention product, when a motor having a capacity of 200 (W) was used, the moving speed was 450 (mm / s) and the thrust was 1.8 in the forward movement of the first stage.
(KN). Further, regarding the above-mentioned invention product, the moving speed was 150 (mm /
s), the thrust is 5.6 (kN).

As described above, in the above-mentioned invention product, 20
Even by using a motor with a capacity of 0 (W), which is smaller than that of the comparative product, a thrust equivalent to that of the comparative product can be realized by the second forward movement (when pressurized). I know that I can do it. In addition, the moving speed of the above-mentioned invention product in the forward movement (during movement) of the first stage is
It can be seen that even though a motor with a small capacity is used, it achieves a higher moving speed than the comparative product. Therefore, according to the above-mentioned two-stage feeding device 1 (invention product), it is possible to realize high-speed movement during movement and high thrust during pressurization.

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view showing a two-stage feeding device according to a first embodiment.

FIG. 2 is a cross-sectional explanatory view showing a two-stage feeding device in a state where a first-stage forward movement operation is performed in the first embodiment.

FIG. 3 is a cross-sectional explanatory view showing a two-stage type feeding device in a state where a second stage forward movement is performed in the first embodiment.

FIG. 4 is a cross-sectional explanatory view showing a two-stage feeding device in a state where a first-stage backward movement operation is performed in the first embodiment.

FIG. 5 is an explanatory cross-sectional view showing the structure of a second guide in the two-stage feeding device in the first embodiment.

FIG. 6 is an explanatory cross-sectional view showing a two-stage feeding device according to the second embodiment.

FIG. 7 is a cross-sectional explanatory view showing a two-stage type feeding device in a state where a first stage forward movement is performed in Example 2;

FIG. 8 is a cross-sectional explanatory view showing a two-stage feeding device in a state where a second-stage forward movement is performed in the second embodiment.

FIG. 9 is an explanatory cross-sectional view showing the two-stage feeding device in a state where the first-stage backward movement operation is performed in the second embodiment.

[Explanation of symbols]

1. ． ． Two-stage feeder, 2. ． ． First lead screw, 205. ． ． Tip, 21. ． ． Engaged part, 3. ． ． First case, 31. ． ． First nut part, 311. ． ． Engagement part, 4. ． ． 2nd lead screw, 405. ． ． Tip, 45. ． ． Engaged part, 5. ． ． Second case, 51. ． ． Second nut part, 511. ． ． Engagement part, 61. ． ． Anti-rotation means, 62. ． ． Integration means, 65. ． ． Integration means, 66. ． ． Anti-rotation means, 7. ． ． motor, 81. ． ． First guide, 85. ． ． Second guide,

Claims (13)

[Claims] 1. A first feed screw which is rotated by a driving force of a motor and which has an engaged portion, and a first nut portion which is screwed to the first feed screw and which engages with the engaged portion. When the first feed screw rotates, it is movable with respect to the first feed screw by screwing the first nut portion, and is integrated with the first feed screw. And a first case that is rotatable relative to the first case, is fixed to the first case, and rotates integrally with the first case.
A second feed screw having a lead pitch different from that of the feed screw, and a second nut portion screwed onto the second feed screw; and when the second feed screw rotates, the second nut portion A second case which is movable with respect to the second feed screw and whose rotation is fixed with respect to the second feed screw, and an integral body of the first case and the first feed screw. Rotation stopping means for stopping rotation, wherein the first case and the first feed screw are integrated by the rotation stopping means when the engaged portion and the engaging portion are not engaged with each other. Movement of the first case of the second case by moving the first case and the second case with respect to the first feed screw by screwing the first nut portion When the engaged portion and the engaging portion are engaged, , And the first case and the first feed screw is rotated integrally, the second casing is moved relative to the second feed screw, first the second case 2
It is characterized in that it is configured to perform the movement operation of the second stage 2
Multi-stage feeder. 2. The two-stage feeding device according to claim 1, wherein the engaged portion is provided at a tip end portion of the first feed screw, so that when the first case moves to a forward end. A two-stage feeding device characterized in that the engaged portion and the engaging portion are configured to engage with each other. 3. The rotation stopping means according to claim 1 or 2, wherein a frictional resistance between the second feed screw and the second nut portion is set between the first feed screw and the first nut portion. A two-stage feeding device characterized by being configured to have a friction resistance larger than that of the above. 4. The method according to claim 1, wherein
The two-stage feed device, wherein the second feed screw has a lead pitch smaller than that of the first feed screw. 5. The method according to any one of claims 1 to 4,
The two-stage feeding device has an integration means for integrating the first case and the first feed screw when the first case moves to the retracted end. Multi-stage feeder. 6. A first feed screw which is rotated by a driving force of a motor, and a first nut portion which is screwed to the first feed screw, wherein when the first feed screw rotates, the first feed screw rotates. First
A first case that is movable with respect to the first feed screw by screwing a nut portion and is rotatable integrally with the first feed screw; and a first case fixed to the first case. The second feed screw, which is rotatable integrally, has a lead pitch different from that of the first feed screw and has an engaged portion, and a second nut portion screwed to the second feed screw, and An engaging portion that engages with the engaged portion, and is movable with respect to the second feed screw by screwing the second nut portion when the second feed screw rotates. The second case includes a second case whose rotation is fixed with respect to the second feed screw, and an unifying means for unifying the first case and the first feed screw, and the engaged portion and the engaging member. When the mating part is not engaged, the first case is made by the integrating means. The first case and the first feed screw are integrally rotated to move the second case with respect to the second feed screw, and the first stage movement operation of the second case is performed. When the engaging portion and the engaging portion are engaged with each other, the first feed screw is rotated with respect to the first case, and the first nut and the first case are screwed together to screw the first case and the first case. A two-stage feed device, characterized in that the second case is moved with respect to the first feed screw to perform a second stage movement operation of the second case. 7. The two-stage feed device according to claim 6, wherein the engaged portion is provided at a tip end portion of the second feed screw so that the second case moves to the forward end. A two-stage feeding device, characterized in that the engaged portion and the engaging portion are configured to engage with each other. 8. The integrated means according to claim 6 or 7, wherein a frictional resistance between the first feed screw and the first nut portion is generated between the second feed screw and the second nut portion. It is configured to be larger than the friction resistance of 2
Multi-stage feeder. 9. The method according to any one of claims 6 to 8,
The two-stage feed device, wherein the second feed screw has a larger lead pitch than the first feed screw. 10. The two-stage feeding device according to any one of claims 6 to 9, wherein when the second case moves to a retracted end, the first case and the first feed screw are separated from each other. A two-stage feeding device having a rotation stopping means for stopping the integral rotation. 11. The two-stage feeding device according to claim 1, further comprising a first guide for guiding the movement and rotation of the first case. Multi-stage feeder. 12. The first case according to claim 11, wherein the first case has a circular cross section, and the first guide has a circular hole into which the first case is inserted and arranged.
The two-stage feeding device, wherein the case is movable and rotatable with respect to the first guide. 13. The two-stage feeding device according to claim 1, further comprising a second guide for guiding the movement of the second case, wherein the second case is the second case. A two-stage feeding device characterized in that rotation is fixed by a guide.