JP2002192551A - Injection device and drive method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To upgrade the responsiveness of an injection member and the detection accuracy of an injecting force, prevent the vibration, noise or the like of an injection device from being generated and reduce the manufacturing cost of the injection device. SOLUTION: This injection device comprises an injection frame, a cylinder member attached to the injection frame, an injection member arranged, in a freely rotating and a freely advancing/receding manner, inside the cylinder member, a rotary sliding member monolithically fitted to the injection member, a first drive means which rotates the rotary sliding member in a first drive state and restrains a rotating force transmitted to the rotary sliding member in a second drive state and a second drive member which moves the rotary sliding member axially in the drive state. In this case, during the injection step, the first drive means is driven in the second drive state and consequently, a rotating force transmitted to the rotary sliding member is restrained, hence no need to arrange a pressure plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device and a driving method thereof.

[0002]

2. Description of the Related Art Conventionally, in an injection molding machine, a screw as an injection member is rotatably and advancing and retracting in a heating cylinder of an injection device, and the screw is rotated by driving a driving means. It can be moved forward and backward. When the screw is rotated in the measuring step, the resin supplied from the hopper into the heating cylinder is heated, melted, advanced, and stored in front of the screw head. Further, in the injection step, when the screw is advanced, the resin stored in front of the screw head is injected from the injection nozzle, and is filled in the cavity space of the mold device.

FIG. 2 is a conceptual diagram of a conventional injection device.

In the figure, reference numeral 11 denotes a heating cylinder, 12 denotes a screw which is disposed rotatably in the heating cylinder 11 and is movable forward and backward (moves in the left-right direction in the figure), and 13 is a front end of the heating cylinder 11 (The left end in the figure), the injection nozzle 14 is the injection nozzle 1
The nozzle opening 15 formed in 3 is the heating cylinder 11
A resin supply port 16 formed at a predetermined position near the rear end (the right end in the figure) is a hopper attached to the resin supply port 15 and containing the resin.

The screw 12 comprises a screw body 2
6, and a screw head 27 attached to the front end of the screw body 26. A flight 23 is spirally formed on the outer peripheral surface of the screw body 26, and a spiral groove 24 is formed by the flight 23. Is done.

When the screw 12 is rotated in the forward direction during the measuring step, the resin dropped from the hopper 16
4, the screw 12 is moved backward (moves to the right in the drawing), and the resin is stored in front of the screw head 27 (to the left in the drawing). .

When the screw 12 is advanced during the injection step, the resin stored in front of the screw head 27 is injected from the injection nozzle 13 and is filled in a cavity space of a mold device (not shown). At this time, a backflow prevention device 25 is provided around the screw head 27 so that the resin stored in front of the screw head 27 does not flow backward.
Is arranged.

Meanwhile, the heating cylinder 11 and the screw 12 are connected to a drive unit for rotating the screw 12 to move forward and backward. That is, the heating cylinder 11
The rear end is attached to the front injection support 31, and the rear injection support 32 is disposed at a predetermined distance from the front injection support 31. In addition, the front injection support 31
A guide bar 33 is installed between the rear injection support 32 and the rear injection support 32, and the pressure plate 3 extends along the guide bar 33.
4 is provided so as to be able to advance and retreat. The front injection support 31 and the rear injection support 32 are fixed to a slide base (not shown) by bolts (not shown).

A drive shaft 35 is integrally attached to the rear end of the screw 12. The drive shaft 35 is supported by bearings 36 and 37 so as to be rotatable with respect to the pressure plate 34 and immovable in the axial direction. Then, in order to rotate the screw 12, an electric measuring motor 41 is provided,
Between the weighing motor 41 and the drive shaft 35,
A first rotation transmission means including pulleys 42 and 43 and a timing belt 44 is provided. Therefore, by driving the weighing motor 41, the drive shaft 35 can be rotated in the forward or reverse direction.
In the present embodiment, the electric weighing motor 4
1, the drive shaft 35 is rotated, but the drive shaft 35 may be rotated using a hydraulic motor.

A ball screw 4 comprising a ball screw shaft 45 and a ball nut 46 screwed together behind the pressure plate 34 (to the right in the figure).
7 is provided, and the ball screw 47 constitutes a movement direction converting means for converting a rotational movement into a linear movement. The ball screw shaft 45 is rotatably supported by the rear injection support 32 by a bearing 48, and the ball nut 46 is fixed to the pressure plate 34 via the plate 51 and the load cell 52. The load cell 52 constitutes an ejection force detecting means for detecting the ejection force and a holding pressure detecting means for detecting the holding pressure.

Further, an injection motor 53 is provided for moving the drive shaft 35 forward and backward, and pulleys 54 and 55 are provided between the injection motor 53 and the ball screw shaft 45.
And a second rotation transmission means including a timing belt 56. Accordingly, the ball nut 46 and the pressure plate 34 are moved by driving the injection motor 53 and rotating the ball screw shaft 45,
The drive shaft 35 can be moved forward and backward. In this case, the guide bar 3 extends through the pressure plate 34.
3 is extended, the rotational force generated by driving the injection motor 53 is applied to the drive shaft 3.
Not transmitted to 5. That is, the pressure plate 34
Is restricted by the guide bar 33 and is not transmitted to the drive shaft 35.

[0012]

However, in the conventional injection device, the rotational force is reduced by the guide bar 33.
, The pressure plate 34 must be moved along the guide bar 33, and the weighing motor 41, the pulleys 42 and 43, the timing belt 44 Need to be moved, so that the weight of the direct acting portion increases.

Therefore, the load applied to the injection motor 53 is increased, so that it is necessary to use a large motor as the injection motor 53, and the injection device becomes large. In addition, the responsiveness of the screw speed when controlling the forward speed of the drive shaft 35 and the screw 12, that is, the screw speed, is reduced. Further, when the screw speed is changed, vibration, noise, and the like are generated in the injection device.

Further, at least two or more guide bars 33 for restraining the rotational force are required.
If the control of the pitch of No. 3 is not strict, the frictional resistance of the sliding portion will change, and the detection accuracy of the radiation output will be reduced.

Further, since it is necessary to rotatably support the screw 12 and the drive shaft 35 with respect to the pressure plate 34, the number of parts such as bearings increases, and the cost of the injection device increases.

The present invention can solve the problems of the conventional injection device and improve the response of the injection member.
An object of the present invention is to provide an injection device and a driving method thereof, which can improve the accuracy of detecting a radiation output, prevent generation of vibration, noise, and the like, and reduce costs.

[0017]

For this purpose, in the injection apparatus according to the present invention, an injection frame, a cylinder member attached to the injection frame, and a rotatable and advancing / retreating inside of the cylinder member are arranged. An injection member provided, a rotary sliding member integrally attached to the injection member, and rotating the rotary sliding member in a first drive state, and rotating the rotary slide member in a second drive state. It has a first driving means for restraining the transmitted rotational force and a second driving means for moving the rotary sliding member in the axial direction in a driving state.

In another injection device of the present invention, the first driving means is placed in a first driving state in a measuring step and in a second driving state in an injection step.

[0019] In still another injection device of the present invention, the second driving means is driven in an injection step.

In still another injection apparatus according to the present invention, in the first driving state, a rotational force generated by driving the first driving means is transmitted to the rotary sliding member. , In the second driving state,
There is a rotational force transmitting / restricting means for restricting the rotational force generated by driving the second driving means via the first driving means.

In still another injection device of the present invention, in order to transmit a linear motion to the rotary sliding member,
There is provided a movement direction converting means for converting a rotational movement by a rotational force generated by driving the second driving means into a rotational linear movement.

In still another injection apparatus of the present invention, the rotary sliding member is configured to be non-rotatable with respect to the rotational force transmitting / restraining means and to be movable in the axial direction so as to be movable in the axial direction. It is arranged rotatable with respect to the means and immovable in the axial direction.

Still another injection device of the present invention further includes a rotational force transmitting means for transmitting a rotational force generated by driving the second driving means to the movement direction converting means.

In still another injection apparatus of the present invention, the first driving means further includes a rotation speed detecting means for detecting a rotation speed.

In the driving method of the injection device according to the present invention,
An injection frame, a cylinder member attached to the injection frame, a rotation member rotatably in the cylinder member, and an injection member arranged to be movable forward and backward, and a rotary sliding member integrally attached to the injection member. It is applied to an injection device provided.

Then, the rotary sliding member is rotated in the first driving state of the first driving means, and the rotational force transmitted to the rotary sliding member in the second driving state of the first driving means is reduced. The rotary sliding member is moved in the axial direction while the second sliding member is being driven.

[0027]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing a main part of an injection device according to an embodiment of the present invention.

In the figure, reference numeral 11 denotes a heating cylinder as a cylinder member, and 12 denotes a screw as an injection member which is rotatably disposed within the heating cylinder 11 and is movable forward and backward (moves in the left-right direction in the figure). In addition, an injection nozzle (not shown) is formed at the front end of the heating cylinder 11, and a nozzle port is formed in the injection nozzle.

The screw 12 includes a screw body,
And a screw head (not shown) attached to the front end of the screw body, and a flight (not shown) is formed in a spiral shape on the outer peripheral surface of the screw body, and the flight forms a spiral groove.

The rear end (right end in the figure) of the heating cylinder 11 is attached to a front injection support 61 via a cylindrical support 60, and the front injection support 6
A rear injection support 62 is disposed at a predetermined distance from the rear injection support 62. The front injection support 61 includes a box-shaped main body 61a.
And covers 61b and 61c. Then, a rod 63 is provided between the front injection support 61 and the rear injection support 62, and a predetermined distance is maintained between the front injection support 61 and the rear injection support 62 by the rod 63. An injection frame is constituted by the front injection support 61, the rear injection support 62, and the rod 63.

At the rear end of the screw 12,
A connecting body 64 having a circular shape is integrally attached, a tubular body 65 is attached to the connecting body 64 via a bolt bt1, and the connecting body 64 and the tubular body 65 constitute a rotary sliding member 68. Is done. The cylindrical body 65 has a length corresponding to the stroke of the screw 12 in the axial direction, and a spline 66 is formed on the outer periphery.

The rotary sliding member 68 is surrounded by a cylindrical rotary member 78. The rotary member 78 includes a cylindrical portion 78a and a spline attached to a rear end of the cylindrical portion 78a by a bolt bt2. 78b, and the spline 78b and the spline 66 are spline-engaged. The rotating member 78 is rotatably supported by the front injection support 61 by bearings b1 and b2.

An electric measuring motor 70 is provided as the first driving means and the rotational force restraining means. In the driving state, the rotary sliding member 68 is rotated in the first driving state, and the rotational force transmitted to the rotary sliding member 68 in the second driving state is restrained. In this case, the driving state means that the weighing motor 70 is controlled based on a detection signal of an encoder 70a described later. The weighing motor 70 includes a front injection support 61.
, A stator 72 attached to the case 71, a rotor 73 disposed radially inward of the stator 72, and a hollow output shaft 74 attached to the rotor 73, The shaft 74 is connected to the case 7
Bearings b3, b4 rotatably supported with respect to
And a measuring motor 70 attached to the output shaft 74.
An encoder 70a is provided as first rotation speed detecting means for detecting the rotation speed of the motor. And, an output gear 75, between the measuring motor 70 and the rotary sliding member 68,
Counter drive gear 76, counter driven gear 77
An output gear 75 is attached to the output shaft 74, the output gear 75 and the counter drive gear 76 are engaged (engaged), and the counter drive gear 76 and the counter driven gear 77 are connected to each other. The counter driven gear 77 is engaged with the rotating member 78 with the bolt bt3. In the present embodiment, the encoder 70a is provided integrally with the weighing motor 70, but the encoder 70a can be formed separately from the weighing motor 70.

Therefore, the weighing motor 70 is
When a rotational force is generated on the output shaft 74 by driving in the driving state of the above, the rotational force is transmitted to the rotary sliding member 68 via an output gear 75, a counter drive gear 76, a counter driven gear 77, and a rotary member 78. The rotary sliding member 68 is rotated in the forward direction or, if necessary, in the reverse direction. Further, when the measuring motor 70 is placed in the second driving state to generate a restraining force and stop the output shaft 74, the rotating force transmitted to the rotary sliding member 68 is restrained. Therefore, the rotation of the screw 12 is also restricted.

Further, a ball screw 83 as a movement direction changing means comprising a ball screw shaft 81 and a ball nut 82 screwed to each other is provided behind the front injection support 61 (to the right in the drawing). . The ball screw shaft 81 has a small-diameter shaft portion 84 and a large-diameter screw portion 8 which are sequentially formed from a front end (left end in the figure) to a rear end.
5, a connecting portion 86 and a medium diameter spline portion 87.
An annular flange member 89 is externally fitted to the step between the shaft portion 84 and the screw portion 85.

Then, an electric injection motor 90 is provided as the second driving means, and the injection motor 90 is driven in the injection step. In this case, the driving state means that the weighing motor 90 is controlled based on a detection signal of an encoder 90a described later. The injection motor 90 includes a case 91 fixed to the rear injection support 62, a stator 92 mounted on the case 91, a rotor 93 disposed radially inward of the stator 92, and mounted on the rotor 93. Hollow output shaft 94, a sleeve 95 attached to the inner periphery of the output shaft 94, and bearings b5 and b for rotatably supporting the output shaft 94 with respect to the case 91.
And an encoder 90a attached to the output shaft 94 and serving as second rotation speed detecting means for detecting the rotation speed of the injection motor 90. The spline 87a formed on the entire outer peripheral surface of the spline portion 87 and the spline 95a formed on the inner peripheral surface of the front end (left end in the figure) of the sleeve 95 are spline-engaged.

In this embodiment, the encoder 90a is provided integrally with the injection motor 90.
The encoder 90a can be formed separately from the injection motor 90.

The output gear 75, the counter drive gear 76, the counter driven gear 77, and the rotating member 78 constitute a rotational force transmitting / constraining means and a transmitting means.
The counter driven gear 77 and the rotating member 78 allow the relative movement of the rotary sliding member 68 in the axial direction with respect to the rotating member 78 while allowing the first motor of the metering motor 70 to move.
Is transmitted to the rotary sliding member 68, and the restraining force generated in the second driving state of the weighing motor 70 is transmitted to the rotary sliding member 68. The rotation of the moving member 68 is restrained. Therefore, the rotary sliding member 68 is connected to the output gear 75,
Counter drive gear 76, counter driven gear 77
And, it is arranged so as not to rotate with respect to the rotating member 78 and to be movable in the axial direction. In addition, the sleeve 95 and the spline portion 87 constitute a rotational force transmitting means. The sleeve 95 and the spline portion 87 move relative to the output shaft 94 in the axial direction of the screw portion 85 when the injection motor 90 is driven. While allowing for
The rotational force generated by driving the injection motor 90 is transmitted to the screw portion 85. The ball screw 83 converts the rotational motion generated by the injection motor 90 into a rotational linear motion in order to transmit the linear motion to the rotary sliding member 68.

To this end, the ball screw shaft 81 is supported at its front end by bearings b7 and b8 so as to be rotatable with respect to the rotary sliding member 68 and not to move in the axial direction, and at the rear end to a ball nut 82 so as to be rotatable. That is, the rotary sliding member 68
Is disposed rotatably with respect to the ball screw 83 and immovable in the axial direction. A male screw is formed at the front end of the shaft portion 84, and a bearing nut 80 is provided so as to be screwed with the male screw. The bearing nut 80
Locates the bearing b7 together with the protrusion 65a formed on the inner peripheral surface of the cylindrical body 65, and positions the bearing b8 together with the annular flange member 89 via the cylindrical body 65. Further, the ball nut 82 is fixed to the rear injection support 62 via a load cell 96. The load cell 96 constitutes an ejection force detection means for detecting the ejection force and a holding pressure detection means for detecting the holding pressure.

Accordingly, the rotational force generated by driving the injection motor 90 in the forward and reverse directions is transmitted to the ball screw shaft 81 via the sleeve 95 and the spline portion 87, and The screwing causes the ball screw shaft 81 to move forward and backward while rotating.

The motion component of the ball screw shaft 81 is transmitted to the rotary sliding member 68 via the bearings b7 and b8, and the linear motion component due to the advance and retreat of the ball screw shaft 81 and the rotational motion due to the rotation of the ball screw shaft 81. Consists of components.
The linear motion component and the rotational motion component are transmitted to the rotary sliding member 68.

In an injection step or the like for moving the rotary sliding member 68 forward or backward without rotating the same, the measuring motor 70 is placed in the second driving state, that is, the rotation restricting state, and the injection motor 90 is moved. By placing it in the driving state, the rotational force transmitted to the rotary sliding member 68 can be restrained, and the rotary sliding member 68 can be moved in the axial direction without rotating. As a result, the linear motion is transmitted to the screw 12 integrally attached to the rotary sliding member 68, and the screw 12 moves forward (moves to the left in the drawing).
Can be done.

Next, a description will be given of a driving method of the injection device having the above-described configuration.

First, at the time of the weighing process, the weighing processing means of the control unit (not shown) performs the weighing process, and drives the weighing motor 70 in the first drive state.
Is transmitted to the screw 12 via the output gear 75, the counter drive gear 76, the counter driven gear 77, the rotating member 78 and the rotating sliding member 68, and rotates the screw 12 in the forward direction. In this case, the rotation speed of the weighing motor 70 is detected by the encoder 70a and fed back to the control unit,
Feedback control is performed in the control unit.

Along with this, the resin dropped from a hopper (not shown) provided in the heating cylinder 11 is advanced in the groove, the screw 12 is moved backward (moved to the right in the figure), and the resin is removed. It is stored in front of the screw head (left side in the figure). At this time, with the retraction force generated in the screw 12, the rotary sliding member 68
Is relatively moved with respect to the rotating member 78 and is retracted. Also, with the retreat of the rotary sliding member 68, the ball screw shaft 81 is also retracted while rotating. In addition,
The metering means drives the injection motor 90 to apply back pressure to the screw 12 while the screw 12 is retracted.

In the injection step, the injection processing means of the control section performs the injection processing, and when the injection motor 90 is driven, the rotational force generated on the output shaft 94 is applied to the sleeve 95 and the spline section 87. Ball screw shaft 8 through
1 and the rotational motion is converted into a rotational linear motion by the ball screw 83. As a result, the ball screw shaft 81 is advanced while rotating, and the rotary sliding member 68 is advanced via the bearings b7 and b8. In this case, the rotation speed of the injection motor 90 is detected by the encoder 90a and is fed back to the control unit, and the control unit performs feedback control. Then, the emission power is detected by the load cell 96 and sent to the control unit,
The control section performs switching control of filling and holding pressure.

In the injection step, the injection processing means drives the metering motor 70 in the second driving state to control the rotation speed of the output shaft 74 to 0 [rpm]. Generate binding force. As a result, the restraining force is transmitted to the rotary sliding member 68 via the output gear 75, the counter drive gear 76, the counter driven gear 77, and the rotary member 78, and transmitted to the rotary sliding member 68 via the ball screw shaft 81. Rotation force is restricted. As a result, the screw 12 integrally attached to the rotary sliding member 68 is advanced without rotating. In this case, the rotation speed of the weighing motor 70 is detected by the encoder 70a and is fed back to the control unit, and the control unit performs feedback control.

As described above, when the screw 12 is advanced, the resin stored in front of the screw head is injected from the injection nozzle, and is filled in a cavity space of a mold device (not shown). At this time, to prevent the resin stored in front of the screw head from flowing back,
A backflow prevention device (not shown) is provided around the screw head.

As described above, by driving the measuring motor 70 in the second driving state during the injection step,
Since the rotational force transmitted to the rotary sliding member 68 is restricted, it is not necessary to arrange a pressure plate between the front injection support 61 and the rear injection support 62, and the number of parts such as bearings is reduced. Thus, the cost of the injection device can be reduced. Then, the metering motor 70, the output gear 75, the counter drive gear 76, the counter driven gear 77, the rotating member 78 and the like can be attached to the front injection support 61, and there is no need to move the same. Therefore, the weight of the direct acting portion can be reduced.

As a result, the load applied to the injection motor 90 is reduced, so that a small electric motor can be used as the injection motor 90, and the injection device can be downsized. Further, the responsiveness of the screw speed when trying to control the screw speed can be improved. Furthermore, when changing the screw speed,
Vibration, noise, and the like can be prevented from being generated in the injection device.

Further, by rotating the measuring motor 70 in the second driving state, the rotational force can be restrained, and it is not necessary to arrange a plurality of guide bars, so that the pitch of the guide bars is strictly controlled. Therefore, it is possible to suppress a change in the frictional resistance of the sliding portion, and it is possible to improve the detection accuracy of the radiation output.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0054]

As described above in detail, according to the present invention, in the injection device, the injection frame, the cylinder member attached to the injection frame, the rotatable inside the cylinder member, and An injection member arranged to be movable forward and backward,
A rotary sliding member integrally attached to the injection member,
Rotating the rotary sliding member in a first driving state,
There is a first driving means for restraining a rotational force transmitted to the rotary sliding member in the second driving state, and a second driving means for moving the rotary sliding member in the axial direction in the driving state.

In this case, by driving the first driving means in the second driving state at the time of the injection step, the rotational force transmitted to the rotary sliding member is restricted, so that it is necessary to dispose the pressure plate. Therefore, the number of parts such as bearings can be reduced, and the cost of the injection device can be reduced. Then, the first driving means, the rotational force transmission / restraining means, etc. can be attached to the injection frame,
No need to move. Therefore, the weight of the direct acting portion can be reduced.

As a result, the load applied to the second drive means is reduced, so that a small motor can be used as the second drive means, and the injection device can be downsized. Further, the responsiveness of the screw speed when trying to control the screw speed can be improved. Further, when the screw speed is changed, it is possible to prevent the injection device from generating vibration, noise, and the like.

Further, by rotating the first driving means in the second driving state, the rotational force can be restrained, and it is not necessary to dispose a plurality of guide bars. It is not necessary to manage, and it is possible to suppress a change in the frictional resistance of the sliding portion, and it is possible to improve the detection accuracy of the radiation output.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of an injection device according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram of a conventional injection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Heating cylinder 12 Screw 61 Front injection support 62 Rear injection support 63 Rod 68 Rotating sliding member 70 Metering motor 70a Encoder 75 Output gear 76 Counter drive gear 77 Counter driven gear 78 Rotating member 83 Ball screw 87 Spline part 90 Injection motor 95 sleeve

Claims (9)

[Claims] 1. An injection frame, (b) a cylinder member attached to the injection frame, and (c) an injection member rotatably and advancing and retracting in the cylinder member. (D) a rotating sliding member integrally attached to the injection member; and (e) rotating the rotating sliding member in a first driving state, and rotating the rotating sliding member in a second driving state. An injection apparatus comprising: a first drive unit for restraining a transmitted rotational force; and (f) a second drive unit for axially moving the rotary sliding member in a drive state. 2. The injection device according to claim 1, wherein the first driving unit is set in a first driving state in a measuring step and in a second driving state in an injection step. 3. The injection device according to claim 1, wherein the second driving unit is set in a driving state in an injection step. 4. In the first driving state, the first driving state
The rotational force generated by driving the driving means is transmitted to the rotary sliding member, and in the second driving state, the rotational force generated by driving the second driving means is transmitted. 2. The injection apparatus according to claim 1, further comprising a rotational force transmitting / constraining means constrained via the first driving means. 5. A motion direction converting means for converting a rotational motion by a rotational force generated by driving the second driving means into a rotational linear motion to transmit the linear motion to the rotary sliding member. The injection device according to claim 1, comprising: 6. The rotary sliding member is configured to transmit the rotational force.
Non-rotatable with respect to the restraining means, and movably in the axial direction, rotatably with respect to the movement direction converting means, and
The injection device according to claim 5, wherein the injection device is arranged so as not to be movable in the axial direction. 7. The injection device according to claim 1, further comprising: a torque transmitting means for transmitting a torque generated by driving the second driving means to the movement direction converting means. 8. The injection device according to claim 1, wherein the first driving unit includes a rotation speed detection unit that detects a rotation speed. 9. An injection frame, a cylinder member attached to the injection frame, an injection member rotatably and advancing and retracting in the cylinder member, and integrally attached to the injection member. In the driving method of an injection device including a rotary sliding member, (a) rotating the rotary sliding member in a first driving state of a first driving unit, and (b) a second driving unit of the first driving unit. (C) moving the rotary sliding member in the axial direction in a driving state of the second driving means while restraining a rotational force transmitted to the rotary sliding member in a driving state. Method.