JP2003064551A - Selective engaging mechanism and electronic assisted by piezoelectric element shedding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely carryout an attitude changing of a lever by using a selector head which utilizes curvature of a piezoelectric element. SOLUTION: This selective engaging mechanism is provided with a selector head 63 taking a selecting attitude by the curvature of the piezoelectric element 62, a lever 8 freely changing attitude and capable of holding the attitude between engaging attitude and non engaging attitude to a hook 4 descending from the top dead center, a select pin 9 which changes position because of the lever 8 changes attitude according to the selected attitude of the selector head 63 to selectively engage and hold the hook 4, a driving pin 10 connected with spring 11 to the lower side of the select pin 9, and operating mechanisms 14, 15 operating selecting attitude of the lever 8 between the select pin 9 and the lever 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a selector head that receives a pattern data electronic information and takes a selected posture by bending a piezoelectric element, and a hook that descends from a top dead center. Of the selector head, and a lever that is capable of changing its posture between an engaging posture that suppresses the movement and a non-engaging posture that allows the descending without engaging with the hook. According to a selection attitude, the lever changes its attitude between the engagement attitude and the non-engagement attitude, and relates to a selective engagement mechanism for selectively engaging and holding the hook by the lever, and such selection. TECHNICAL FIELD The present invention relates to a piezoelectric element assisted electronic opening device having an engagement mechanism.

[0002]

2. Description of the Related Art As a prior art of a selective engagement mechanism provided in such an electronic opening device, for example, Japanese Unexamined Patent Application Publication No.
The thing disclosed in 0-239939 can be mentioned. This prior art relates to a needle selection device of a jacquard machine, and as shown in FIGS. 10 to 13 of the specification, a piezoelectric actuator 8 (corresponding to a piezoelectric element of the present application) is bent by receiving pattern data electronic information. In this state, the vertical needle selector needle 2 (corresponding to the lever of the present application) is selectively swung via the operator 6 (corresponding to the selector head of the present application), and the vertical needle 20 of the vertical needle selector needle 2 (the present application). (Corresponding to the hook) of) is determined.

On the other hand, there is one in which the attitude of the lever is changed by the cooperation of an electromagnet and a spring provided in the selector head. Such an example can be found in JP-A-10-96134.

[0004]

In the former prior art described above, the bending state of the piezoelectric actuator 8 is directly transmitted to the vertical needle selector 2 via the operator 6 to thereby select the vertical needle. Child 2
Since the structure for changing the posture is adopted, there is a problem that a large swing torque cannot be obtained and it is difficult to secure stable operation for a long period of time.

Further, in the case of this configuration, the bending timing of the piezoelectric actuator 8 becomes the posture change timing of the vertical needle selector needle 2. The posture change timing of this vertical needle selector needle 2 is the vertical needle selector needle. It is necessary that the timing of the vertical needle 20, which is the counterpart of the second engagement, reaches the top dead center. However, such timing adjustment is inevitably strict, requires severe adjustment, and tends to cause a malfunction.

On the other hand, in the latter prior art, since the electromagnet and the spring are used to change the posture of the lever, it is easy to secure the torque for swinging, but heat is easily generated by a large number of operations. . Further, in the example disclosed in Japanese Patent Application Laid-Open No. 10-96134, as shown in the specification and FIGS. 4, 5 and 6, the lever tip and the hook tip are always kept in contact with each other. During continuous use for a certain period of time, wear is likely to occur at this contact portion.

The object of the present application is to employ a structure having a selector head that utilizes the bending of a piezoelectric element, but it is possible to surely change the attitude of the lever and to change the attitude of the selector head. It is to obtain a selective engagement mechanism having a margin.

[0008]

In order to achieve this object, the selective engaging mechanism according to the present invention according to claim 1 is characterized in that it is movable between a lowered position and a raised position, and the lowered position. A select pin having a standby position, and a drive pin that is elastically connected to the lower side of the select pin so as to be able to approach / separate elastically, and is operated to be lifted by lifting of the hook, and between the select pin and the lever, An operation mechanism for selecting a posture of the lever between the non-engaging posture and the engaging posture by the movement of the select pin is provided, and the movement of the select pin according to the selecting posture of the selector head is restricted. , With the movement of the drive pin,
It is to adopt a configuration in which the select pin selectively changes the posture of the lever.

In this structure, the drive pin is moved up as the hook rises to the top dead center. A select pin is elastically connected to the upper portion of the drive pin via a spring or the like, and if there is no restriction on the movement of the select pin, the select pin also moves from its lowered position to its raised position.

On the other hand, a selector head having a piezoelectric element is provided for the select pin, and the movement of the select pin may or may not be restricted depending on the selection attitude of the selector head.

Further, regarding the relationship between the select pin and the lever, when the select pin moves from the lowered position to the raised position, the posture of the lever is changed via the operation mechanism.

Therefore, the movement or non-movement of the select pin is selectively determined according to the selected posture of the selector head,
At the same time, the posture change of the lever is selectively executed via the operation mechanism provided between the select pin and the lever. Here, for example, when the movement of the select pin is restricted by the selector head, the select pin does not move due to the elastic connection structure between the drive pin and the select pin, and the movement of the drive pin is absorbed by the elastic connection structure. .

In this structure, the raising operation of the hook is used for changing the posture of the lever according to the selection posture of the selector head, and the problem that the large swing torque cannot be used can be solved. Further, the posture change timing of the lever follows the ascending timing of the hook, but the posture change timing of the selector head does not need to match in a strict sense with respect to these timings. It is said that there is no problem. Therefore, the above-mentioned strict adjustment is not necessary.

Further, in comparison with the latter prior art, since there is no need to use an electromagnet or the like and the lever and hook are not always in contact with each other, there is a problem of heat generation and contact with sliding. The problem of surface wear can be solved easily.

In the above structure, as described in claim 2, a first select pin and a second select pin (a pair of select pins) are provided as select pins to configure the operation mechanism. A first operating mechanism for operating the lever from the non-engagement posture to the engagement posture by moving the first select pin from the lowered position to the raised position between the first select pin and the lever. A second operation mechanism for operating the lever from the engaged posture to the non-engaged posture by moving the second select pin from the lowered position to the raised position between the second select pin and the lever Is preferably provided.

In this structure, an independent select pin is provided corresponding to the change of the lever attitude from the engagement attitude to the non-engagement attitude and vice versa. This changes the posture of the lever. On the other hand, the lifting restriction of both select pins is made according to the selection attitude of the selector head as described above, so that the attitude of the lever can be changed appropriately.

In the structure described so far, as described in claim 3, a magnetic attraction holding mechanism is provided between the lever and the mechanism frame, and the attitude holding of the lever is performed by the magnetic attraction holding mechanism. It is preferable to do so. By doing so, the posture of the lever in a specific posture can be held relatively easily.

In this case, as described in claim 4, the attracting force of the magnetic attraction holding mechanism can maintain the selected posture in which the lever is held by the vibration transmitted to the mechanism, and It is weaker than the elastic repulsion force of the spring that holds the drive pin and the select pin apart by elastic repulsion.

With this selection, the problem that the holding state is released due to the vibration transmitted to the mechanism is solved, and the current posture of the lever can be maintained. On the other hand, in the case where the lever is brought into the selected posture by the movement of the select pin, the movement of the select pin is accompanied by the movement of the drive pin, and further the posture of the lever is changed (release of the suction holding by the magnetic suction holding mechanism). However, since the magnetic attraction force is set to be weaker than the elastic repulsion force, this operation can be reliably performed.

In the above-mentioned structure, as described in claim 5, it is preferable that the attitude change timing of the selector head precedes the rising contact timing of the drive focus of the hook correspondingly following. .

As described above, in the mechanism of the present application, the coincidence between the two timings is not required. Therefore, by allowing the former timing to precede the latter, the selection attitude of the selector head is determined in advance,
It is possible to realize the operation status as to whether or not to restrict the movement of the subsequent select pin, and to ensure the operation. Therefore,
The rigorous adjustments previously required are not required in the present application.

As described in claim 6, it is preferable that the lower end of the selector head is provided with a recess into which the upper end of the select pin enters.

In the case of the present application, while the select pin moves upward to the selector head side, for example, in a predetermined selection posture, it is necessary to restrict the move of the select pin by the selector head. . When such a restriction is executed, it is preferable that the tip of the select pin is reliably caught by the selector head when the select pin is in contact with the selector head. In this case, if the lower end of the selector head is provided with a recess into which the upper end of the select pin enters, the contact relationship between the two can be ensured and the restricting operation by the selector head can be ensured.

Now, as described in claim 7,
A module unit including the selector head, lever, select pin, and drive pin, a guide rail unit including the hook, and a pulley positioned by an engaging position of the hook are separately and separately provided. It is preferable. If such a structure is adopted, if an abnormality etc. occurs in the module section or if there is an abnormality in the guide rail section, it is possible to easily restore the normal operating state by replacing only that section. it can.

As described in claim 8, the selective engagement state of a pair of hooks provided corresponding to a pair of left and right knives that alternately repeats raising and lowering is selectively performed on one sheet provided on the selector head. The configuration is preferably determined by the curvature of the piezoelectric element.

By adopting such a configuration, a single piezoelectric element is normally operated based on the selected attitude of the selector head in conjunction with the operation of a pair of knives that normally operate as a pair and a pair of hooks that follow it. With the selector head,
It is possible to favorably select the engagement positioning of the pair of hooks.

Further, as described in claim 9, by providing the piezoelectric element assisted electronic opening device provided with the selective engagement mechanism described so far, it is difficult for the operation abnormality to occur even at high speed operation. It is possible to obtain an electronic opening device that can perform stable operation over a period of time.

BEST MODE FOR CARRYING OUT THE INVENTION An example in which the present application is applied to a jacquard loom equipped with an electronic shedding device 1 according to the present application will be described. FIG. 10 shows a loom 2 equipped with the electric shedding device 1 of the present application.
Is simplified and illustrated. In the loom 2, the warp 100 is sent out from the warp beam 200, and each warp 100 is passed through the heddle of the heddle 300 in order to perform an opening operation that allows the introduction of the weft to form the fabric. The woven cloth 101 formed by inserting the
It is configured to be wound around 00.

In the illustrated embodiment, only two healds 3
00 or the case where there are two groups of healds 300, one 300a of which is located above and the other 300b is located below. The lower end of each heddle 300 is connected to the mechanism frame of the loom 2 by a tension spring 500,
On the other hand, the upper end portion is connected to the guide 600, and the heddle 300 can be positioned for opening. This guide 600
Is moved up and down by an electronic opening device 1 provided in the jacquard machine.

The jacquard machine is provided with a knife 3 which is mechanically reciprocally moved up and down for the purpose of patterning by a known structure, and a hook 4 which also moves up and down in accordance with the movement of the knife 3 is provided. It is equipped. The selective engagement mechanism 5 provided in the electronic opening device 1 of the present application has a pair of hooks 4 that move up and down in response to the vertical movement of the pair of knives 3 for the purpose of patterning, as shown in FIG. The purpose of this is to hold and engage in a vertical positional relationship and to appropriately control the opening of the heddle 300.

As shown in FIG. 1 ((a) is a side view and (b) is a front view), the selective engagement mechanism 1 is constructed by independently including a module section 6 and a guide rail section 7. , Assembled so that they can work together as a unit.

As shown in FIG. 1, the module section 6 has a controller 61 for transmitting the pattern data electronic information to a piezoelectric element as an individual piezoelectric actuator, and this controller 61.
A large number (specifically, 16 units) of piezoelectric elements 62 that receive electrical information from the piezoelectric elements 62 and bend according to the information, selector heads 63 provided corresponding to these piezoelectric elements 62, and each selector head 63. And a selection operation portion 64 for selectively engaging and holding the hook 4 in accordance with the selection posture described above.

The guide rail portion 7 is provided with slidable first and second sheaves 72, 73 connected to each other by a connecting member 71 in a guide groove 74 provided in a vertical direction in the main body. A wire 75 provided by connecting the lower ends of the pair of hooks 4 is stretched over the first pulley 72 located on the upper side, and the second pulley 73 located on the lower side is
A guide wire 77 connected to the upper ends of a pair of guides 76 connected to the heddle 300 is laid. By adopting such a structure, the opening operation can be appropriately performed due to the vertical positional relationship of the hook 4 shown in FIG.

In the structure shown in FIG. 1, twelve selective engagement mechanisms 5 are included in one set. As will be described in detail below, this selective engagement mechanism 5 corresponds to a pair of knives 3 that repeatedly rise and fall alternately as shown in FIG. Selective posture of the selector head 63 is determined, and vertical positions of the pair of left and right hooks 4 shown in FIG. 7 are selectively determined. Figure 6
It is an exploded view of the selective engagement mechanism 5.

Since the feature of the selective engagement mechanism 5 of the present application is in the engagement positioning selection structure of the hook 4 by the lever 8 provided in the selection operation section 64 according to the selection posture of the selector head 63, this part is mainly focused. Then, in the following,
The explanation will focus on points 4 and 5.

First, the selector head 63 located above the selective engagement mechanism 5 will be described. This is configured so that the bending of the piezoelectric element 62 allows one of the two selected postures to be selected. FIG. 1A shows a state in which the left-side selection posture and the right-side selection posture are alternately taken in order from the selector head 63 located on the left side toward the right side in the figure. This posture selection is caused by the upper arm 63a of the selector head 63 swinging in the left-right direction in FIG. 1A due to the bending of the piezoelectric element 62. 2 to 5 (a) (side view), the swing direction is horizontal, and (b) (front view) is the front-back direction swing direction.

Next, the hook 4 provided on the guide rail portion 7 located below the selection operation portion 64 will be described. As described above, the hook 4 is configured to be slidable in the vertical direction along the vertical guide groove 80 provided in the guide rail portion 7, and the pair of left and right shown in FIG. The lower end side of the hook 4 is connected by a wire 75, and the intermediate portion of the wire 75 is hooked by the first pulley 72.

2 to 5 (b), the hook 4 comes into contact with the sliding guide portion 4a guided by the guide groove 80 and the knife 3 rising from the lower side from above. The knife contact portion 4b is in contact with the hook 4 and the hook engaging portion 4c is provided near the upper end of the hook 4 and engages with the lever engaging portion 8a provided at the lower end of the lever 8 of the selecting operation portion 64. This hook 4 is, for example, as shown in FIG.
The left knife 3 shown in (e) is moved up to reach the top dead center. In this way, the state of reaching the top dead center is the state shown in FIGS. On the other hand, the lowering of the hook 4 depends on the engagement / non-engagement state with the lever 8 provided in the selection operation unit 64, but in the non-engagement state, it is shown in FIGS. ) As shown in the operation of the left side hook 4 in FIG.

The structure of the selection operation unit 64 will be described below. As shown in FIGS. 2 to 6, the selection operation unit 64 is
The mechanism frame is provided with a second select pin 9b, a lever 8, a drive pin 10, and a first select pin 9a. Further, as shown in FIGS. 2 to 5, the first spring 11a is provided between the drive pin 10 and the mechanism frame, and the drive pin 10, the first select pin 9a and the second select pin 9 are provided.
The second spring 11b is provided between the second spring 11b and b. Here, the first and second select pins 9a and 9b are the same as those shown in FIG.
In (b), the sheets are positioned so as to overlap with each other in the front-back direction of the paper surface (the left-right direction in FIG.

Further, the structure of each member will be described in relation to its function. As shown in the figure, the lever 8 is configured to be swingable about its swing axis, and is engaged with the hook 4 that descends from the top dead center to suppress the descending. Matching posture (posture shown in Fig. 3)
And a non-engaging posture (a posture shown in FIG. 2) that allows the hook 4 to descend without engaging with the hook 4.

Further, the magnet 1 is attached to the upper end of the lever 8.
2 is built in, and an iron piece 13 is housed in a pair of mechanism frame portions with which the upper end portion abuts, and when the lever 8 takes a fixed posture, the magnet 1
Due to the magnetic adsorption force generated between the iron piece 13 and the iron piece 13, the current posture is maintained as it is.
The protrusion 8b provided in the middle of the lever 8 toward the outside of the mechanism frame is for allowing the engaged state to be released by an operator's operation.

On the other hand, a pair of driven cam surfaces 14 are provided at an intermediate position between the projection 8b and the upper end portion. These driven cam surfaces 14 are active cam surfaces 15 provided on the first select pin 9a or the second select pin 9b, respectively.
It is provided for contacting with and receiving a posture changing operation. A lever engaging portion 8a that engages with the hook engaging portion 4c is provided at the lower end of the lever 8.

The first select pin 9a and the second select pin 9b are movable between a lowered position (position shown in FIGS. 4 and 5) and an elevated position (position shown in FIGS. 2 and 3). And is elastically connected to the drive pin 10 via the second spring 11b. These select pins 9a and 9b have their lowered position as a standby position, and this standby position is secured by each spring force when the drive pin 10 is in the standby position. 2, 3,
As shown in FIGS. 4 and 5 (a), the upper ends of the select pins 9a and 9b are selected so as to be separated from the lower end of the selector head 63 in the lowered position, and the lower end of the selector head 63 in the raised position. Is directly above, it is selected to have a positional relationship in which the contact is abutted and the rise is restricted.

The relationship between the select pins 9a and 9b and the lever 8 will be described. The first select pin 9a
Is provided with an active cam surface 15 (see FIG. 3B). When the first select pin 9a is moved from the lowered position to the raised position, the active cam surface 15 is driven by the lever.
The lever 8 is contacted with to operate the lever 8 from its non-engaged posture to the engaged posture. Here, such an operating mechanism is referred to as a first operating mechanism.

Similarly, the second select pin 9b is provided with an active cam surface 15 (see FIG. 2B), and the lever 8 is moved by moving the second select pin 9b from the lowered position to the raised position. It is configured to operate from the engaged posture to the non-engaged posture. Here, such an operating mechanism is referred to as a second operating mechanism.

On the other hand, when both of the select pins 9a and 9b are moved down from the raised position to the lowered position, any of the select pins 9a and 9b does not contribute to the attitude change of the lever 8. It is said that.

The contact structure between the selector head 63 and the select pins 9a and 9b will be described below.
As can be seen from FIG. 2A, etc., the selector head 63
The swing axis of is selected right above the intermediate position between the first and second select pins 9a and 9b. And the selector head 6
As shown in FIG. 9, a lower end of 3 is provided with a pair of inclined surfaces 63b that are recessed toward the center side in a side view. On the other hand, similarly to the side view, an inclined surface 90 (higher to the intermediate position side of the select pin) corresponding to the inclined surface 63b is provided at the tips of the select pins 9a and 9b. By adopting this structure, when the selector head 63 is in the selection posture, the inclined surface 63b on the recessed side serves as a guide surface at the tip of the select pin, and the regulation can be reliably performed.

The drive pin 10 is also movable between a lowered position and a raised position, and the lowered position is a standby position. The drive pin 10 is connected to the mechanism frame via the first spring 11a, and is structured to be biased to its lowered position. In addition, when the hook 4 coming up from the descent is brought into contact with the hook 4 and the driving pin 10 is raised, the descent position is set, and when there is no restriction by the selector head 63, the hook 4 is raised. The drive pin 10 and the select pins 9a and 9b are also set so as to come to their raised positions when in the dead center.

The first select pin 9a and the second select pin 9b and the drive pin 10 are elastically connected by a second spring 11b. Regarding the elastic repulsive force of the second spring 11b, the current selected posture of the lever 8 is maintained with respect to the vibration transmitted by the magnetic attraction and holding mechanism composed of the magnet 12 and the iron piece 13 to the mechanism frame. It is possible and is selected to be weaker than the elastic repulsive force of the second spring 11b. By selecting in this way, the posture of the lever 8 can be favorably changed.

The configuration of the selective engagement mechanism has been described above. The operation will be described with reference to FIGS. 1 State of FIG. 2 This state shows the state in which the knife 3 is moving up, and the hook 4 is also moved up at the same time. On the other hand, as shown in (a) of the side view, the selector head 63 is in the selection posture in which the selector head 63 swings to the right side, and the first selection pin 9
This is a state where the rise of a is restricted. When the hook 4 is raised in this state, the drive pin 10 is raised by the hook 4, the second select pin 9b is raised, and the lever 8 is changed from the engaged posture to the non-engaged posture. .

2 State of FIG. 3 This state also shows the state in which the knife 3 is moving up, and the hook 4 is also moved up at the same time. On the other hand, as shown in (a) of the side view, the selector head 63 is in the selection posture in which the selector head 63 swings to the left side, and the second select pin 9
This is a state where the rise of b is regulated. When the hook 4 is raised in this state, the drive pin 10 is raised by the hook 4, the first select pin 9a is raised, and the attitude of the lever 8 is changed from the non-engagement attitude to the engagement attitude. .

3 State of FIG. 4 This state shows the state in which the knife 3 is descending. On the other hand, as shown in (a) of the side view, the selector head 63 is in the selection posture in which the selector head 63 swings to the right,
This is a state in which the rise of the first select pin 9a is restricted. In this state, the first and second select pins 9a,
Since both 9b are held in the lowered position, the lever 8 is maintained in the disengaged position. And knife 3
When is lowered, the hook 4 is also lowered in accordance with this lowering operation.

4 State of FIG. 5 This state also shows the state in which the knife 3 is descending. On the other hand, as shown in (a) of the side view, the selector head 63 is in a selection posture in which the selector head 63 swings to the left,
This is a state in which the rise of the second select pin 9b is restricted. In this state, the first and second select pins 9a,
Since both 9b are held in the lowered position, the posture of the lever 8 is maintained in the engaged posture. Then, even when the knife 3 is lowered, the hook 4 maintains its position while being engaged with the lever 8.

The above four operation states are combined,
It operates as shown in FIGS. (A) and (c) show the engaged state corresponding to the lower opening position, and (e) shows the engaged state corresponding to the upper opening position.

In the above description, the timing of changing the attitude of the selector head 63 and the timing of the corresponding rising and contact of the hook 4 with the drive pin 10 have not been described. The relationship between these timings will be described with reference to FIG.

In FIG. 8, the horizontal axis represents time,
The vertical axis indicates the positions of the left and right knives 3. Here, the left and right knives 3 mean, for example, a pair of left and right knives 3 shown in FIG. The vertical movement locus of the right knife 3a is shown by a solid line, and the vertical movement locus of the left knife 3b is shown by a dashed line. Further, the timing at which the knife 3 contacts the drive pin 10 is shown by a broken line parallel to the horizontal axis, intersecting these loci. Therefore, as indicated by the shaded box in the figure, the shaded portion is the period during which the drive pin 10 pushes up the upper and lower select pins 9a and 9b. Now, the posture change timing T1 of the selector head 63 is indicated by an arrow. As can be seen from this figure, the posture change timing T1 of the selector head 63 is set to precede the corresponding rising timing of the hook 4 to the drive pin 10 (timing in the hatched box). You can see that it is selected. Therefore, in this structure, it is possible to prepare the timing for receiving the pattern data electronic information and bending the piezoelectric element considerably in advance. As a result, there is no need for the conventional severe timing adjustment, and it is not necessary to bend the piezoelectric element to the original position for the next pattern data electronic information. Is also advantageous.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a selective engagement mechanism.

FIG. 2 is a diagram showing a state in the module unit at the time of an operation of setting a lever in a non-engaging posture.

FIG. 3 is a diagram showing a state inside the module unit at the time of an operation of bringing a lever into an engagement posture.

FIG. 4 is a diagram showing a state in the module unit when the hook descends with the lever in a non-engagement posture.

FIG. 5 is a view showing a state in the module part when the descent of the hook is restricted by the lever in the engaged posture.

FIG. 6 is an exploded view of a selection operation unit

FIG. 7 is a diagram showing a temporal operation sequence of a selection operation unit.

FIG. 8 is a diagram showing the relationship between the positions of the left and right knives over time, the attitude change timing of the selector head, and the lifting contact timing of the drive pin and the select pin.

FIG. 9 is a diagram showing a contact state between the upper end of the select pin and the lower end of the selector head.

FIG. 10 is a diagram showing a configuration of a loom equipped with a jacquard.

[Explanation of symbols]

1 Electronic opening device 3 hooks 4 knife 5 Selective engagement mechanism 6 module section 7 Guide rail part 8 levers 9 select pins 10 drive pins 11 spring 12 magnets 13 Iron pieces 14 Driven cam surface 15 Active cam surface 63 Selector head 64 Selector 72 First pulley 73 Second pulley 75 wire 77 Guide

Claims (9)

[Claims] 1. A selector head which receives a pattern data electronic information and takes a selective posture by bending a piezoelectric element, and an engaging posture which engages with the hook and suppresses the descending with respect to a hook descending from a top dead center. And a lever capable of changing its posture and holding its posture between the hook and the non-engagement posture that allows the lowering without engaging with the hook, and the lever according to the selected posture of the selector head. Is a selective engagement mechanism that changes the posture between the engaged posture and the non-engaged posture and selectively engages and holds the hook by the lever, and is between a lowered position and a raised position. The select pin, which is movable and has the lowered position as the standby position, and the drive pin, which is elastically connected to the lower side of the select pin so as to be able to approach / separate elastically, and is operated to be lifted by raising the hook, Between the pin and the lever, there is provided an operation mechanism for performing a posture selection operation of the lever between the non-engagement posture and the engagement posture by moving the select pin, and the operation mechanism according to the selection posture of the selector head is provided. A selective engagement mechanism in which the select pin selectively changes the posture of the lever as the drive pin is raised due to the movement of the select pin. 2. The first select pin and the second select pin are provided as the select pins, and the operating mechanism is configured such that the lowered position of the first select pin is between the first select pin and the lever. From the non-engagement posture to the engagement posture by moving the lever from the non-engagement posture to the engagement posture, between the second select pin and the lever, The selective engagement mechanism according to claim 1, further comprising a second operation mechanism that operates the lever from the engagement posture to the non-engagement posture by moving the lever from the lowered position to the raised position. 3. The selective engagement mechanism according to claim 1, wherein a magnetic attraction holding mechanism is provided between the lever and the mechanism frame, and the posture of the lever is held by the magnetic attraction holding mechanism. 4. An elastic force of a spring that allows the attraction force of the magnetic attraction holding mechanism to maintain the selected posture of the lever with respect to vibration transmitted to the mechanism, and elastically repulsively holds the drive pin and the select pin. The selective engagement mechanism according to claim 3, wherein the selective engagement mechanism is selected to be weaker than the repulsive force. 5. The selector according to claim 1, wherein the attitude change timing of the selector head precedes the corresponding rising timing of the hook to the drive pin. Coordination mechanism. 6. The selective engagement mechanism according to claim 1, wherein a recess into which an upper end of the select pin enters is provided at a lower end of the selector head. 7. A guide rail portion, which internally includes a module portion including the selector head, a lever, a select pin, and a drive pin, the hook, and a pulley positioned by an engaging position of the hook is independently provided. The selective engagement mechanism according to any one of claims 1 to 6, which is detachably provided. 8. A selective engagement state of a pair of the hooks provided corresponding to a pair of knives that alternately repeats ascending and descending is determined by bending one piezoelectric element provided for the selector head. The selective engagement mechanism according to any one of claims 1 to 7. 9. A piezoelectric element-assisted electronic aperture device comprising the selective engagement mechanism according to claim 1. Description: