JPH11119078A - Posture restricting mechanism for movable frame body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact high-accuracy movable frame posture restricting mechanism for a square lens barrel. SOLUTION: This mechanism is a mechanism for restricting the posture of a movable frame 2 which can move back and forth along an optical axis R. It is equipped with a 1st shaft constituted of follower pins 2a and 2c orthogonal to the optical axis R and a 2nd shaft constituted of follower pins 2b and 2d restricting the posture of the movable frame orthogonally to both the optical axis and the 1st shaft so as to transmit driving force to the movable frame; and further equipped with a driving lever 3 having cam grooves 3a and 3b so that the orthogonal posture of the 1st shaft to the optical axis may be kept by holding the 1st shaft in the midst of moving the movable frame, and a restricting lever 4 having cam grooves 4a and 4b so that the orthogonal posture of the 2nd shaft to the optical axis may be kept by holding the 2nd shaft. The respective mechanisms consisting of the follower pins 2a and 2c and the cam grooves 3a and 3b and the follower pins 2b and 2d and the cam grooves 4a and 4b constitute either a cam mechanism or an inverse cam mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a posture restricting mechanism for a movable frame, and more particularly, to a posture restricting mechanism for a movable barrel in a rectangular lens barrel of a camera.

[0002]

2. Description of the Related Art Originally, a lens barrel is generally of a cylindrical type according to the shape of the lens, but a recent camera employs a rectangular lens barrel in accordance with a rectangular frame shape. As a result, the space around the lens barrel can be effectively used to reduce the size of the camera.

In particular, in recent cameras, a camera equipped with a zoom lens has become mainstream, and a camera employing a rectangular lens barrel as described above cannot rotate the movable lens barrel around the optical axis. In order to slide the lens barrel in parallel with the optical axis with respect to the fixed lens barrel, a posture restricting mechanism corresponding to the shape of the lens barrel is required.

[0004] As a conventional attitude restraint mechanism for a rectangular lens barrel,
Japanese Unexamined Patent Publication No. 4-289808 (first prior art) and Japanese Utility Model Laid-Open No. 4-126235 (second prior art) are known.

The first prior art attitude restraint mechanism has a configuration in which a guide bar parallel to the optical axis is provided, and a movable lens barrel is suspended from the guide bar and moved parallel to the optical axis.
In this suspension structure, it is necessary to take a sufficient length of the slide member (length along the axial direction of the guide bar) to be fitted to the guide bar so that the movable lens barrel does not tilt with respect to the optical axis. This causes the axial length of the lens barrel to be increased.

The second prior art posture restraint mechanism employs a pantograph-type telescopic link mechanism,
The movable lens barrel is moved in parallel to the optical axis by expanding and contracting the link mechanism in the optical axis direction. In this pantograph-type link mechanism, the number of the rotation connecting portions is large, and if the backlash accumulates at those portions, it is difficult to slide the movable lens barrel accurately on the optical axis.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a compact and highly accurate movable frame attitude restraining mechanism for a rectangular lens barrel.

[0008]

SUMMARY OF THE INVENTION A posture restricting mechanism for a movable frame according to the present invention has the following structure in order to solve the problems of the prior art as described above and to achieve the object. That is, a mechanism for restraining the posture of the movable frame body that can reciprocate along a straight line is provided, and a first shaft body orthogonal to the straight line and the movable frame body orthogonal to both the straight line and the first shaft body. A second shaft body for constraining the posture of the body, a first holding mechanism for holding the first shaft body during movement of the movable frame body and maintaining a perpendicular posture of the first shaft body with respect to the straight line, Second
A second holding mechanism for holding the shaft body and maintaining the orthogonal posture of the second shaft body with respect to the first shaft body, wherein each of the first holding mechanism and the second holding mechanism includes the first shaft body and Either a cam mechanism including the second shaft body or an inverse cam mechanism is provided.

Further, the posture restraining mechanism of the movable frame according to the present invention comprises:
The movable frame further includes a fixed frame provided with a linear guide portion for guiding the linear reciprocating motion of the movable frame, wherein the first shaft is coaxially substantially 180 ° opposite to each other from the outer peripheral surface of the movable frame. The first holding mechanism is formed by two projecting first pins, and the first holding mechanism is pivotally supported by the fixed frame so as to have a cam mechanism, and is engaged with the first pin at the tip end of the swing. A first arm portion and a second arm portion having a first cam profile portion to be combined, wherein the position of the first pin is determined by the linear guide portion and the first cam profile portion. Is preferred.

[0010] The posture restricting mechanism of the movable frame of the present invention further comprises a fixed frame provided with a linear guide for guiding the linear reciprocating motion of the movable frame, and the first holding mechanism comprises an inverted cam mechanism. A first arm portion and a second arm portion which are pivotally supported by the fixed frame so as to have a first pin which constitutes the first shaft as an inverted cam follower at the tip end of the swing. Approximately 180 ° relative to each other on the outer peripheral surface of the movable frame body.
A first cam profile portion is formed on an opposite surface to engage with the first pin, and the position of the first pin is determined by the linear guide portion and the first cam profile portion. Can also.

Further, the posture restricting mechanism for a movable frame according to the present invention further comprises a fixed frame provided with a linear guide for guiding the linear reciprocating movement of the movable frame, wherein the second shaft is provided with the movable shaft. The second holding mechanism is formed by two second pins protruding coaxially from the outer peripheral surface of the frame body at substantially 180 ° opposite sides to each other, and the second holding mechanism is pivotally attached to the fixed frame body so as to have a cam mechanism. A third arm portion and a fourth arm portion provided with a second cam profile portion which is supported and engages with the second pin at the rocking tip side, and the position of the second pin is
Preferably, it is configured to be determined by the second cam profile.

Alternatively, the posture restricting mechanism for a movable frame according to the present invention further comprises a fixed frame provided with a linear guide for guiding the linear reciprocating movement of the movable frame, and the second holding mechanism is a reverse cam mechanism. The second frame as a cam follower is pivotally supported by the fixed frame so as to have
A third arm portion and a fourth arm portion provided with a second pin constituting a shaft body, and the first arm portion and the fourth arm portion having substantially the same length on the outer peripheral surface of the movable frame body;
It is preferable that a second cam profile portion to be engaged with the second pin is formed on the surface opposite to the 80 °, and the position of the second pin is determined by the second cam profile portion.

Further, the posture restricting mechanism for a movable frame according to the present invention includes a linear guide portion for guiding the linear reciprocating motion of the movable frame, and further includes a fixed frame having first pins formed on surfaces facing each other. The first holding mechanism further includes a cam mechanism, the first holding mechanism is swingably engaged with a shaft on the movable frame body constituting the first shaft body, and is provided at a swinging tip side thereof.
A first arm portion formed with a first cam profile portion engaged with the first pin; and a second arm portion, wherein the position of the first pin is determined by the linear guide portion and the first cam profile portion. It can also be configured to be determined.

Further, the posture restricting mechanism for a movable frame of the present invention includes a linear guide portion for guiding the linear reciprocating motion of the movable frame, and further includes a fixed cam profile formed on surfaces facing each other. Further comprising a frame, wherein the first
The holding mechanism has a reverse cam mechanism. The holding mechanism is swingably engaged with a shaft on the movable frame constituting the first shaft body, and the first cam profile portion and A first arm portion and a second arm portion formed with a first pin as a reverse cam follower to be engaged, and the position of the first pin is determined by the linear guide portion and the first cam profile portion; It can also be configured so that:

Further, the posture restricting mechanism for a movable frame according to the present invention includes a linear guide portion for guiding the linear reciprocating movement of the movable frame, and further includes a fixed frame having a second pin formed on surfaces facing each other. The second holding mechanism further includes a reverse cam mechanism, the second holding mechanism is swingably engaged with a shaft on the movable frame body that constitutes the second shaft body, and is provided at a swinging tip side thereof. A third arm portion and a fourth arm portion having a second cam profile portion engaged with the second pin, wherein a position of the second pin is determined by the second cam profile portion; You can also.

Further, the posture restricting mechanism for a movable frame according to the present invention includes a linear guide portion for guiding the linear reciprocating motion of the movable frame, and further comprises a second cam profile portion formed on surfaces facing each other. A frame body, wherein the second
The holding mechanism is swingably engaged with a shaft on the movable frame constituting the second shaft so as to have a reverse cam mechanism. It is also possible to have a third arm portion and a fourth arm portion formed with a second pin as a cam follower to be engaged, wherein the position of the second pin is determined by the second cam profile portion. it can.

Furthermore, in the posture restricting mechanism for a movable frame according to the present invention, it is preferable that the first holding mechanism or the second holding mechanism has a drive transmitting portion so as to transmit a driving force to the movable frame.

Further, in the posture restricting mechanism for a movable frame according to the present invention, the first holding mechanism or the second holding mechanism includes an interlocking portion for driving other units in conjunction with the movement of the movable frame. It is preferred to have.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view of a rectangular lens barrel employing a movable frame attitude restraining mechanism according to the present invention, and shows a state in which the movable frame has advanced from a fixed frame. FIG. 2 shows FIG.
FIG. 3 is a front view of FIG. FIG. 4 is a perspective view of the rectangular lens barrel of FIG. 1, and FIG. 5 is an exploded perspective view thereof. FIG. 6 is a plan view of a rectangular barrel in which the movable frame body posture restraining mechanism according to the present invention is employed, and shows a state where the movable frame is retracted into the fixed frame. FIG. 7 is a side view of FIG. Each of the lens barrels includes a rectangular fixed frame 1 and a movable frame 2. The movable frame 2 slides with respect to the fixed frame 1 so that the movable frame 2 moves in and out of the fixed frame 1. ing. In the drawing, the one-dot chain line indicates the optical axis R of the optical system formed by the lens barrel, and the movable frame 2 moves along the optical axis R. This optical axis R is, of course, a linear axis.

Pins (hereinafter referred to as follower pins) 2 serving as cam followers for engaging with cams (described later) for guiding and restricting the movement of the movable frame 2 are provided on four outer peripheral surfaces around the movable frame 2.
a, 2b, 2c, and 2d are formed to protrude. The pair of follower pins 2a and 2c and the pair of 2b and 2d formed on the opposing outer peripheral surface are formed at coaxial positions, respectively, and have the same configuration as one shaft body. Are perpendicular to the optical axis R, and are perpendicular to each other.

In order to restrain the attitude of the movable frame 2 with respect to the fixed frame 1 during the movement, transmit driving force to the movable frame 2 and regulate the movement to a predetermined movement, follower pins 2a and 2c are provided.
The first lever 3 and the second lever 4 are pivotally engaged with each other. The first lever 3 transmits a driving force to the movable frame 2 via the follower pins 2a and 2c, and the second lever 4 receives a force from the moving movable frame 2 via the follower pins 2b and 2d. The movable posture of the movable frame 2 is restricted. Hereinafter, the first lever 3 will be referred to as the drive lever 3, the second lever 4
Is referred to as a restraint lever 4.

The drive lever 3 is provided outside the fixed frame 1, and the restraining lever 4 is provided inside the fixed frame 1 and outside the movable frame 2. Each of the levers 3 and 4 is formed by three sides of a “U” shape along the three-side outer peripheral surface and the three-side inner peripheral surface of the fixed frame 1, and a pivot axis (described later) parallel to one side of the center.
The shaft support portions (circular holes) 3c, 3d and 4c, 4d to be supported by the support member. Slots or grooves 3a, 3b and 4a, 4b are provided at both ends on the open end side of each lever 3, 4.
Are formed. These grooves 3a, 3b and 4a, 4
b is a pair of follower pins 2a and 2c and 2
b, 2d to form a cam profile capable of imparting a predetermined movement to each follower pin by allowing each lever to pivot. Less than,
These grooves are called cam grooves 3a, 3b and 4a, 4b. The pair of cam grooves 3a and 3b and the pair of cam grooves 4a and 4b form symmetric cam profiles having the same shape. Regarding the force transmission relationship, the cam grooves 3a, 3b of the drive lever 3 are driven links to correspond to the follower pins 2a,
Since 2c is a driven link, both of them constitute a cam mechanism.
Since a and 4b are driven links and the corresponding follower pins 2b and 2d are driving links, both of them constitute a reverse cam mechanism.

The fixed frame 1 has a slot or groove 1a, 1a, 2b along the optical axis R at a position facing the follower pins 2a, 2c.
1b is formed. These grooves 1a and 1b are engaged with the follower pins 2a and 2c to prevent eccentric movement in the direction orthogonal to the optical axis R of the movable frame 2 and the axis formed by the follower pins 2a and 2c, and to move the optical axis R to the optical axis. Restrict to linear reciprocation in the direction along R. Hereinafter, these grooves are referred to as straight grooves 1a and 1b. A shaft portion 1c serving as the above-mentioned pivot shaft of the drive lever 3 is formed from the same wall on which the rectilinear grooves 1a and 1b are formed.
Are formed so as to protrude outward, and are rotatably fitted in the shaft supports 3c and 3d of the drive lever 3.

A shaft portion 1 serving as the above-mentioned pivot shaft of the restraint lever 4 is provided on one of the inner peripheral surfaces of the fixed frame 1 which is an opposing pair.
d and 1 e are formed so as to protrude inward of the frame, and are rotatably fitted in the shaft supports 4 c and 4 d of the restraining lever 4.

Further, the opposite inner peripheral surfaces 1f and 1f of the fixed frame 1 are provided on one of the opposing outer peripheral surfaces of the movable frame 2 in order to restrict parallel eccentricity with respect to the axis formed by the follower pins 2a and 2c. Ribs 2e and 2f slidably contacting 1g are formed. Here, the driving force transmission for moving the movable frame 2 is performed.
The gear A is geared with a gear train from a motor (not shown). Further, in connection with the driving force to another unit, for example, a finder or a flash, a gear B (not shown) is integrally attached to the lever 3 on the 3c side of the lever 3 on the 1c axis. Are engaged with a finder or a flash drive gear train (not shown).

Next, the operation when the movable frame 2 is moved by the posture restricting mechanism of the rectangular lens barrel configured as described above will be described.

The driving force is transmitted to the movable frame 2 via the follower pins 2a and 2c by the drive lever 3, and the movable frame 2 is moved, for example, forward (to the tele side if the lens barrel is a zoom lens barrel). Follower pins 2a, 2c
The eccentricity in the axis direction and the direction orthogonal to the axis is suppressed by the above-described method, and the levers 3a, 3a
While maintaining the angle (here, a right angle) with respect to the optical axis R by c, the movable frame 2 produces a forward linear motion. However, the movable frame 2 also tends to generate a rotational movement about the axis determined by the follower pins 2a and 2c. Movable frame 2
In order to restrict the posture, the rotational movement should be prevented. This rotational movement is performed by the follower pins 2a and 2c.
For the follower pins 2b and 2d perpendicular to the above, one pin is given a forward movement in the optical axis direction, and the other pin is given a backward movement in the optical axis direction. Attention is paid to the operation of the restraint lever 4 in this state. Since the follower pin 2b of the movable frame 2 is engaged with the cam groove 4a of the restraining lever 4, for example, when the follower pin 2b moves forward in the optical axis direction, the restraining lever 4 moves forward around the shaft supports 4c and 4d. Attempts to rotate (counterclockwise in FIG. 2). At this time, in the cam groove 4b of the restraining lever 4, the follower pin 2d is about to move backward in the optical axis direction. However, since the cam groove 4b is about to rotate forward similarly to the cam groove 4a, the follower pin 2d is moved rearward. From the front. Therefore, the movable frame 2 cannot be rotated with respect to the axis provided by the follower pins 2a and 2c except for the backlash, and is restricted at that position. In this operation, even when the movable frame 2 is moved backward, the transmission of the force is performed by the same mechanism only by reversing the driving direction. When the motor (not shown) rotates, the gear A rotates via a gear train (not shown), and the integrated lever 3 rotates around 1c. When the lever B rotates, the integrated gear B rotates around 1c and the finder or flash is driven through a gear train (not shown). The driving force is transmitted to.

When the drive lever 3 is rotated to move the movable frame 2 in the optical axis direction, the follower pins 2b, 2d
Due to the engagement between the movable frame 2 and the cam grooves 4a and 4b, the rotation of the restraint lever 4 is accompanied, and the inclination of the movable frame 2 with respect to the optical axis R is restricted.
At the same time, parallel eccentricity with respect to the axis constituted by the follower pins 2a, 2c is regulated by the ribs 2e, 2f slidably abutting on the opposed inner peripheral surfaces 1f, 1g of the fixed frame 1. As a result, the movable frame 2 is not generated except for the backlash of the connecting portion.
Can be moved in the optical axis direction.

In the above-described embodiment, the driving lever 3 and the restraining lever 4 are configured to be rotatable around the axis on the fixed frame 1. The same effect can be obtained even in the case of.

Also, the cam is arranged on the drive lever 3 and the restraining lever 4 and the cam follower is arranged on the movable frame 2. Of course, the cam is arranged on the movable frame 2 or the fixed frame 1 and the cam follower is arranged on each lever. Even if the relationship between the cam mechanism and the reverse cam mechanism is reversed, the same effect can be obtained. In the above-described embodiment, the driving force is transmitted by a method of applying a rotational force to the lever 3. However, the lever 3 and the lever 4 are used only for restraining the posture of the movable frame 2, and the driving force is different. A configuration provided by a mechanism may be used. For example,
The same effect can be obtained by disposing the screw for screw feed on the fixed portion and moving the movable frame by rotating the screw integrally attached to the movable frame. In the above-described embodiment, the driving force of another unit, for example, a finder or a flash, is interlocked from the rotation of the lever 3. However, the driving force is interlocked from the rotation of the lever 4. An equivalent effect can be obtained. Lever 3 (Lever 4)
Although the configuration is such that interlocking is performed from the gear B that is integral with the lever 3, the same effect can be obtained by directly interlocking with the movement of the lever 3 (lever 4).

[0031]

As described above, according to the present invention, it is not necessary to provide a member extending long in the optical axis direction so that the movable lens barrel does not tilt with respect to the optical axis. Since the length of the tube in the axial direction is not increased, and the number of the rotating connection portions is small, the accumulation of the backlash is small, and the movable barrel can be slid with high accuracy on the optical axis. That is, the present invention provides a compact and high-accuracy posture restraint mechanism for a rectangular lens barrel.

[Brief description of the drawings]

FIG. 1 is a plan view of a rectangular lens barrel employing a movable frame body posture restraint mechanism according to the present invention, showing a state in which a movable frame has advanced from a fixed frame.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a perspective view of the rectangular lens barrel of FIG.

FIG. 5 is an exploded perspective view of the rectangular lens barrel of FIG.

FIG. 6 is a plan view of a rectangular lens barrel in which the movable frame body posture restraining mechanism according to the present invention is employed, showing a state where the movable frame is retracted into the fixed frame.

FIG. 7 is a side view of FIG. 6;

[Explanation of symbols]

 Reference Signs List 1 fixed frame 1a, 1b rectilinear groove 1c pivot shaft 1d, 1e pivot shaft 1f, 1g opposed inner peripheral surface 2 movable frame 2a, 2b, 2c, 2d follower pin 2e, 2f rib 3 drive lever 3a, 3b cam groove 3c 3d shaft support 4 restraint lever 4a, 4b cam groove 4c, 4d shaft support R optical axis

Claims (11)

[Claims] 1. A mechanism for restraining the posture of a movable frame body that can reciprocate along a straight line, comprising: a first shaft body orthogonal to the straight line; and a first shaft body orthogonal to both the straight line and the first shaft body. A second shaft body for restraining the posture of the movable frame body, and a first holding mechanism for holding the first shaft body during movement of the movable frame body and maintaining an orthogonal posture of the first shaft body with respect to the straight line. And a second holding mechanism that holds the second shaft body and maintains the orthogonal posture of the second shaft body with respect to the first shaft body, wherein each of the first holding mechanism and the second holding mechanism is A posture restricting mechanism for a movable frame, comprising one of a cam mechanism including a first shaft body and a second shaft body or an inverse cam mechanism. 2. The apparatus according to claim 1, further comprising: a fixed frame provided with a linear guide for guiding the linear reciprocating movement of the movable frame, wherein the first shaft is substantially one-way from an outer peripheral surface of the movable frame.
The first holding mechanism is formed by two first pins protruding coaxially to the opposite side by 80 °, and the first holding mechanism is pivotally supported by the fixed frame so as to have a cam mechanism, and has a swinging tip. On the side, the first
A first arm portion and a second arm portion having a first cam profile portion engaged with a pin, wherein the position of the first pin is determined by the linear guide portion and the first cam profile portion; The posture restricting mechanism for a movable frame body according to claim 1, wherein: 3. A fixed frame having a linear guide for guiding the linear reciprocating motion of the movable frame, wherein the first holding mechanism swings on the fixed frame to have an inverted cam mechanism. A first arm portion and a second arm portion which are movably supported by a shaft and which have a first pin constituting the first shaft member as an inverted cam follower on the side of a swinging end thereof, and an outer periphery of the movable frame member; A first cam profile portion that engages with the first pin is formed on the surfaces approximately 180 ° opposite to each other, and the position of the first pin is determined by the linear guide portion and the first cam profile portion. The mechanism for restraining the posture of a movable frame according to claim 1, wherein: 4. The apparatus according to claim 1, further comprising a fixed frame having a linear guide for guiding the linear reciprocating motion of the movable frame, wherein the second shaft is substantially one-way from an outer peripheral surface of the movable frame.
The second holding mechanism is formed by two second pins protruding coaxially to the opposite side by 80 °. The second holding mechanism is pivotally supported by the fixed frame so as to have a cam mechanism, and its swinging tip side. A third cam profile formed with a second cam profile for engaging with the second pin.
4. The mechanism according to claim 1, further comprising an arm and a fourth arm, wherein the position of the second pin is determined by the second cam profile. 5. 5. The apparatus according to claim 1, further comprising a fixed frame provided with a linear guide for guiding the linear reciprocating movement of the movable frame, wherein the second holding mechanism swings on the fixed frame to have an inverted cam mechanism. A third arm portion and a fourth arm portion which are movably supported by a pivot and which have a second pin constituting the second shaft body as a cam follower on the tip side of the swing thereof, and an outer peripheral surface of the movable frame body; 4. A second cam profile portion, which engages with the second pin, is formed on the surfaces opposite to each other by approximately 180 °, and the position of the second pin is determined by the second cam profile portion. The posture restraint mechanism of the movable frame body according to any one of the above. 6. A linear guide portion for guiding a linear reciprocating motion of the movable frame body, and a first guide portion is provided on surfaces facing each other.
It further includes a fixed frame having a pin formed therein, and the first holding mechanism is swingably engaged with a shaft on the movable frame constituting the first shaft so as to have a cam mechanism. A first arm portion having a first cam profile portion which engages with the first pin and a second arm portion are provided on the tip end side of the swing.
The posture restricting mechanism for a movable frame according to claim 1, further comprising an arm portion, wherein a position of the first pin is determined by the linear guide portion and the first cam profile portion. 7. A linear guide portion for guiding the linear reciprocating motion of the movable frame body, and a first guide portion is provided on surfaces facing each other.
The first holding mechanism further includes a fixed frame having a cam profile formed thereon, and the first holding mechanism has a reverse cam mechanism so as to be swingable with respect to an axis on the movable frame constituting the first shaft. A first arm portion and a second arm portion formed with a first pin as an inverted cam follower engaged with the first cam profile portion on the swinging tip side, and the position of the first pin 2. The posture restricting mechanism for a movable frame according to claim 1, wherein the angle is determined by the linear guide portion and the first cam profile portion. 8. A linear guide portion for guiding the linear reciprocating motion of the movable frame body, and a second guide portion is provided on surfaces facing each other.
It further includes a fixed frame having a pin formed therein, and the second holding mechanism is swingably engaged with a shaft on the movable frame constituting the second shaft so as to have a reverse cam mechanism. At the tip end side of the lever, a second
The posture restricting mechanism for a movable frame body according to claim 1, further comprising a third arm portion and a fourth arm portion formed with a cam profile portion, wherein the position of the second pin is determined by the second cam profile portion. . 9. A linear guide portion for guiding a linear reciprocating motion of the movable frame body, and a second guide portion is provided on surfaces facing each other.
The second holding mechanism further includes a fixed frame having a cam profile formed thereon, and the second holding mechanism has a reverse cam mechanism so as to be swingable with respect to a shaft on the movable frame constituting the second shaft. And a third arm portion and a fourth arm portion formed with a second pin as a cam follower engaged with the second cam profile portion on the rocking tip side, and the position of the second pin is 2. The posture restricting mechanism for a movable frame according to claim 1, wherein the posture is determined by the second cam profile portion. 10. In order to transmit a driving force to the movable frame,
The posture restricting mechanism for a movable frame body according to claim 1, wherein the first holding mechanism or the second holding mechanism has a drive transmission unit. 11. The posture restraint of the movable frame according to claim 1, wherein the first holding mechanism or the second holding mechanism has an interlocking portion to drive another unit in conjunction with the movement of the movable frame. mechanism.