JPH0440191Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a winding device for a camera shutter, and more particularly to an automatic winding device that charges the leading and trailing blades of the shutter using a motor.

[Background of the idea]

In a camera shutter of the type that opens and closes the shutter aperture by running a leading blade group and a trailing blade group formed with a plurality of divided blades, in order to make the shutter small and lightweight, it is necessary to It is necessary to reduce the width in the running direction and also to reduce the overlapping width with adjacent shutter blades. However, when the shutter aperture is fully closed using only the leading blade group or the trailing blade group consisting of such narrow shutter blades, there is a risk of light leakage from the narrow overlapping portion. Therefore, in order to avoid such light leakage, a camera shutter is constructed so that the leading blade group doubles over all or part of the shutter aperture, which is fully closed by the trailing blade group after the shutter is opened and closed. For example, JP-A-50
-129218 and JP-A-51-133015, and are already known.

However, in all of these known camera shutters, in addition to a drive spring that drives the leading blade group and the trailing blade group, one of the shutter blade groups is moved in the opposite direction to the traveling direction after exposure is completed. In order to move it, a return spring separate from the travel drive spring is added. Therefore, when charging the shutter, it is necessary to charge the return spring in addition to the drive spring for driving the shutter blade group against its biasing force. Therefore, in a camera such as an automatic winding shutter in which the shutter is charged by a motor, the winding motor is not only large in size but also consumes a large amount of the power battery.

[Purpose of invention]

The present invention provides an automatic camera shutter winding device that eliminates the drawbacks of the conventional camera shutter described above, has no fear of light leakage, operates extremely smoothly, consumes little power battery, is small in size, and has a relatively simple structure. The purpose is to

[Summary of the idea]

In order to achieve the above object, the present invention includes a single motor 1, 1 which rotates when the exposure operation is completed and a shutter release operation, respectively; a first drive member 59 which operates integrally with the leading blade group 8, 8; 59; first drive springs 62, 62 that bias the first drive member so that the leading blade group travels from the initial position to the exposure completion position;
a second drive member 23, 205 that operates integrally with the rear blade groups 9, 9; and a second drive spring 27 that biases the second drive member so that the rear blade group moves from the initial position to the exposure completion position. , 27; a first charge member 31 that moves one of the first drive member and the second drive member 59, 205 against the biasing force of the drive springs 62, 27 that bias the one drive member; ，
20, 201; a second charge member 20 that moves the other one of the first drive member and the second drive member 23, 59 against the biasing force of the drive springs 27, 62 that bias the other drive member; 203; first and second engaging portions 60a, 59a, 205A, 205B formed on the one drive member 59, 205;
The first charge member 31, 20, 201 moves the one drive member 59, 205, and the blade groups 8, 9 that operate together with the one drive member move from the exposure completion position to an intermediate position that partially covers the aperture. When the first engaging portions 60a, 205A formed on the one driving member 59, 205 move within the traveling locus and locking the one driving member, The first charge members 31, 20, while keeping the blade groups 8, 9 that operate together in an intermediate position
201 moves the one driving member 59, 205, and the blade groups 8, 9 that operate integrally with the one driving member are moved from the intermediate position to the initial position, the one driving member 59, 205 moves. A first blade that enters the travel locus of the formed second engaging portions 59a, 205B, locks the one driving member, and maintains the blade groups 8, 9, which operate integrally with the one driving member, at the initial position. The first locking members 55, 48; the second charging members 20, 203 move the other driving member 23, 59, and the blade groups 9, 8, which operate together with the other driving member, move from the exposure completion position to the initial stage. a second locking member 48, 55 that locks the other drive member 23, 59 when moved to the position and maintains the blade group 9, 8, which operates integrally with the other drive member, at the initial position; In response to the shutter release operation, the first locking member 55,
48 retreats from the running locus of the second engaging portions 59a, 205B.
205 and the other drive member 23, 59 by the second locking members 48, 55 at predetermined exposure time intervals; 50; blade groups 8, 9 that transmit the rotation of the motors 1, 1 to the first charge members 31, 20, 201 in response to completion of the exposure operation, and operate integrally with the one drive member 59, 205; The first charge member 31, 20, 2 rotates the motor 1, 1 in response to a shutter release operation performed after the exposure completion position is moved from the exposure completion position to the intermediate position.
01 to move the blade groups 8 and 9, which operate integrally with the one drive member, from the intermediate position to the initial position, while rotating the motor in response to either the shutter release operation or the completion of the exposure operation. 1, 1 to the second charge member 20, 203 to move the blade groups 9, 8, which operate together with the other drive member 23, 59, from the exposure completion position to the initial position. Before the shutter release operation, the blade groups 8 and 9 that operate integrally with the one drive member are in an intermediate position;
In addition, the blade groups 9 and 8, which operate together with the other driving member, are arranged so as to completely cover the aperture, and both blade groups cover the aperture doubly.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

FIG. 1 is a plan view showing a first embodiment of the present invention, in which a worm 2 fixed integrally with a drive shaft of a reversible motor 1 is meshed with a worm wheel 3. A gear 4 integrally connected to the worm wheel 3 is rotatably supported along with the worm wheel 3 on a shaft 6 fixed to the shutter base plate 5.

Therefore, the driving force of the motor 1 is transmitted to the shutter charge system described below via this gear 4, and the leading blade group 8 and trailing blade group 9 that cover the shutter aperture 7 move against the urging force of the driving spring. Then, the shutter is charged.

FIG. 2 is an enlarged plan view of the shutter charge mechanism section A in the embodiment shown in FIG. This terminal gear 11 is fixed to the shutter base plate 5 and rotatably supported by a support shaft 13 that holds an upper substrate 12.

FIG. 3 is a sectional view of the terminal gear portion supported by the support shaft 13, and shows the hollow shaft portion 11a of the terminal gear 11.
A semicircular cam 14 is integrally fixed to the end of the cam. A pin shaft 16 that rotatably supports the pressing claw 15 is implanted on the lower surface of the semicircular cam 14.
The pressing pawl 15 is configured to rotate counterclockwise in FIG. 2 around the pin shaft 16 by a torsion spring 17, and to be in constant pressure contact with the pin 18 implanted on the lower surface of the semicircular cam 14. (See Figure 4).

In addition, in FIG. 3, a notch gear 20 and a plate cam 21 are connected to each other by three rivets 19 on the outer periphery of the hollow shaft portion 11a between the terminal gear 11 and the half-moon cam 14. 11 so as to be rotatable. This notched gear 20
The plate cam 21 has cutout relief portions 20a at three locations forming an angle of 120° dividing the circumference into three equal parts, as shown in FIG. It has three protruding cam parts 21A, and the protruding cam parts 21a and the notched relief part 20a of the notched gear 20 are configured to overlap with each other. Further, on the protruding cam portions 21A provided at three locations on the plate cam 21, engaging pins 22 that can come into contact with the pressing claws 15 are provided at an angle of 120°.

Notched gear 20 integrally connected to plate cam 21
can mesh with the first segment gear 25. This first segment gear 25 is integrally connected with a rear blade drive member 23 for moving the rear blade group 9 by a pin 24 . The first segment gear 25 and the rear blade drive member 23 are rotatably supported by a support shaft 26 fixed on the shutter base plate 5, and are rotated clockwise around the support shaft 26 by a drive spring 27. is urged to do so. Further, the rear blade driving member 23 has two arms 23A and 23B, one of which is the arm 23.
A connecting pin 28 is fixedly installed at A. The connecting pin 28 is configured to pass through an arcuate groove 5a formed in the shutter base plate 5 (see FIG. 2), connect with a rear blade drive lever (not shown), and operate the rear blade 9 of the shutter. There is. Further, the other arm 23B is one arm 4 of a control lever 48, which will be described later.
8A.

On the other hand, the pillar 29 fixed to the shutter base plate 5
A charge lever 31 is rotatably supported by a support shaft 32 on the intermediate substrate 30 held by the supports 29C and A, 29B and the upper substrate 12. This charge lever 31 is the fifth
As shown in the figure, there is a first arm 31A on one side and a second arm 31B on the other side around the support shaft 32, and the first arm 31A and and a third arm 31C formed to overlap vertically, and a torsion spring 33.
(see FIG. 2) so that it can rotate clockwise. The bearing 34 provided at the end of the first arm 31A is in pressure contact with the outer peripheral surface 14a of the semicircular cam 14 due to the biasing force of the torsion spring 33, and the charge lever 31 is rotated by the rotation of the semicircular cam 14. It is configured to rotate. Further, the third arm 31C is provided with a roller 35,
When the plate cam 21 rotates, its cam surface 21a
The charge lever 31 is rotated counterclockwise. In addition, the second arm 31
The bearing 36 provided at the end of B is connected to a charge receiver 6 fixed to a leading blade drive member 59, which will be described later.
It is constructed so as to be in pressure contact with 0. Note that an appropriate interval is formed between the shutter base plate 5 and the intermediate base plate 30 so that the rear blade drive member 23 and the first segment gear 25 can freely rotate therebetween.

Furthermore, the second arm 31 of the charge lever 31
In B, a cutter is fixed by a rivet 37A so that the second segment gear 37 can rotate together with the charge lever 31 around the support shaft 32, and is rotatably supported by a support shaft 39 implanted in the shutter base plate 5. It meshes with the missing gear 40. A control plate 41 for controlling the travel of the leading blade group 8 of the shutter is rotatably provided on the support shaft 39. The control plate 41 is urged to rotate counterclockwise by a torsion spring 38, and a stepped portion 41a protruding from its upper surface is in contact with a notched stepped portion 40a formed in the notched gear 40. In addition, control board 4
An arcuate protrusion 41b provided on the lower surface of the lever 1 engages with a hook 42a formed at one end of the locking lever 42, as shown in FIG. This latch lever 4
2 is supported by a support shaft 43 fixed to the upper substrate 12 (see FIG. 2), and is urged by a torsion spring 44 to be rotatable in a counterclockwise direction. The other end 42b of this latch lever 42 is driven by a torsion spring 44 by an interlocking member (not shown) that is driven by the reversible motor 1 when the shutter is released and is moved before the leading blade group 8 travels. The hook portion 42a is moved against the biasing force of the hook portion 42a to remove the hook portion 42a.

Also, a cam surface 41c is provided on the outer periphery of the control plate 41.
A bearing 45 is in contact with this cam surface 41c, as shown in FIG. This bearing 45 is connected to a driven lever 47 rotatably supported by a support shaft 46 fixed to the shutter base plate 5.
It is provided on one arm 47A of. A bent portion 47a is formed at the end of the other arm of the driven lever 47. Further, a control lever 48 that controls the travel of the rear blade drive member 23 is also rotatably supported by the support shaft 46. This control lever 48 is
It has two arms 48A and 48B that are integrally connected via a bent portion 48a, one of which is the first arm 48.
A is formed so that the other arm 23B of the rear blade drive member 23 can be hooked thereto. The other second arm 48B has a bent end, and an armature iron piece 49 is fixed to the bent end 48b, and the upper board 12
When the magnet 50 attached to the armature iron piece 49 is energized, the magnet 50
It is structured so that it can be attracted to. Further, the tip of the other arm 47B of the driven lever 47 is also bent, and is biased by a torsion spring 51 so that the bent tip 47a and the bent tip 48b of the control lever 48 engage with each other. . Furthermore, the control lever 48 is biased by a torsion spring 52 to rotate clockwise (see FIG. 2).

Furthermore, in FIG. 2, when the control plate 41 rotates counterclockwise due to the biasing force of the torsion spring 38,
A tip portion 53 that can come into contact with the stepped portion 41a of the control board 41
A leading blade release lever 53 having an arrow mark a is rotatably supported by a support shaft 54 fixed to the shutter base plate 5. Further, a leading blade latching lever 55 is rotatably supported on this support shaft 54, and is biased by a torsion spring 56 so as to be able to rotate counterclockwise. The leading blade latching lever 55 and the leading blade release lever 53 are connected to each other by an eccentric pin 57, and the tip portion 53a of the leading blade release lever 53 and the tip latching portion 55 of the leading blade latching lever 55 are connected to each other by an eccentric pin 57.
The central angle between the support shaft 54 and the support shaft 54 can be adjusted by rotating the eccentric pin 57. The leading blade latching lever 5
The tip hooking portion 55a of No. 5 is formed to be able to engage with a bent portion 59a of the leading blade driving member 59 and a corner portion 60a of a charge receiver 60 fixedly provided on the leading blade driving member 59. In addition, the second part of the charge lever 31 is attached to the protrusion 60b provided on the charge receiver 60.
A bearing 36 provided on the arm 31B is in pressure contact with the arm 31B.

The leading blade driving member 59 is rotatably supported by a support shaft 61 fixed to the shutter base plate 5, and is urged by a leading blade driving spring 62 so as to rotate clockwise. A connecting pin 63 is fixed to the other end of the leading blade driving member 59 on the opposite side to the bent portion 59a, and this connecting pin 63 connects the leading blade group 8 through the circular arc groove 5b formed in the shutter base plate 5. It is coupled to a vane drive lever 64 (see FIG. 1).

Next, the operation of the above embodiment will be explained.
1 to 5 show a state immediately before shutter release in which the shutter aperture 7 is covered by a leading blade group 8 and a trailing blade group 9. In the state shown in FIG. 1, when the release button (not shown) on the camera body is pressed, the reversible motor 1 rotates forward, and the worm 2,
The terminal gear 11 is rotated clockwise via the gears 3 and 4 and the idle gear 10. As the terminal gear 11 rotates, the semicircular cam 14 also rotates clockwise about the support shaft 13. This semicircular cam 14
The bearing 34, which is in pressure contact with the outer circumferential surface 14a of the cam surface 14b as shown in FIG. 5, has a large cam lift.
As a result, the charge lever 31
is rotated clockwise about the support shaft 32 by the biasing force of the torsion spring 33. Therefore, the bearing 36 provided at the tip of the second arm 31B of the charge lever 31 is displaced to the left in FIG. In response to this displacement of the bearing 36, the leading blade driving member 59, together with the charge receiver 60, tends to move clockwise about the support shaft 61 due to the biasing force of the leading blade driving spring 62. However, when the leading blade driving member 59 moves only slightly in the clockwise direction, the corner 60a of the charge receiver 60 comes into contact with the latching tip 55a of the leading blade latching lever 55, thereby being restrained. Therefore, the leading blade group 8 interlocked with this leading blade driving member 59 is moved by the arrow B in FIG.
Movement in this direction is restricted, and the shutter aperture 7 is placed in a double-covered state with a portion of the shutter aperture 7 remaining and the rest of the shutter blade group 9 as shown in FIG. In this case, when the charge lever 31 rotates clockwise, the notch gear 40 that meshes with the second segment gear 37 fixed to the charge lever 31 rotates counterclockwise. However, the control plate 41, which is urged to rotate counterclockwise by the torsion spring 38, has an arcuate protrusion 41b that is connected to the locking lever 41.
Since it is hooked by the hook portion 42a, it does not rotate.

Therefore, the notched step portion 40a of the notched gear 40 separates from the protruding step portion 41a of the control plate 41, and only the notched gear 40 rotates counterclockwise.

When the semicircular cam 14 rotates approximately 60 degrees from the starting position (the position shown in FIG. 5), the tip 15a of the pressing claw 15 comes into contact with the engagement pin 22 on the plate cam 21. After the contact, the semicircular cam 14
When rotated clockwise, the pressing claw 15 pushes the engagement pin 22 to the left in FIG. Therefore, the plate cam 21 and the notched gear 20 rotate together with the semicircular cam 14 about the support shaft 13 together with the engagement pin 22 . When the semicircular cam 14 further rotates, the cam surface 21a of the plate cam 21 (see FIG. 5)
contacts a roller 35 provided on the third arm 31C of the charge lever 31, and via this roller 35 the charge lever 31 is rotated counterclockwise about the support shaft 32 against the biasing force of the torsion spring 33. let Due to this counterclockwise rotation of the charge lever 31, the bearing 36 provided at the tip of the second arm 31B is displaced to the right in FIG.
The leading blade driving member 59 is moved to the support shaft 61 via the charge holder 60 against the biasing force of the leading blade driving spring 62.
Rotate counterclockwise around the center. When the leading blade driving member 59 rotates counterclockwise, the leading blade group 8 moves in the direction of arrow C in FIG. 1, completely closing the shutter aperture 7.

Further, when the leading blade driving member 59 rotates counterclockwise, its bent portion 59a moves to the right in FIG. 2, and after the leading blade group fully closes the shutter aperture 7, the leading blade Tip latching part 5 of latching lever 55
Leave 5a. When this bent portion 59a separates from the tip hooking portion 55a, the tip blade hooking lever 5
5 rotates counterclockwise around a support shaft 54 by the biasing force of a torsion spring 56, and the tip 53a of the leading blade release lever 53, which rotates together with the leading blade latch lever 55, is attached to the control plate 41. Stepped portion 41
Close to a. Note that by rotating the leading blade locking lever 55 in the counterclockwise direction, the leading blade locking portion 55a and the end surface of the bent portion 59a of the leading blade driving member 59 can be engaged with each other, and the clock of the leading blade driving member 59 can be engaged with the tip locking portion 55a. Movement in this direction is prevented by this leading blade latching lever 55.

The semicircular cam 14 further rotates clockwise, and the roller 35 moves to the highest part 21b of the plate cam 21.
(See Fig. 5), the charge lever 31 moves onto the support shaft 32 due to the biasing force of the torsion spring 33.
When the semicircular cam 14 rotates clockwise around , and rotates 180 degrees after the start, as shown in Fig. 6,
The reversible motor 1 stops, the semicircular cam 14 also stops, and the bearing 34 comes into contact with the lowest cam lift position 14C of the semicircular cam 14. At this time, the bearing 36 provided at the tip of the second arm 31B of the charge lever 31 is located at the most clockwise rotated position, that is, from the locus of movement of the bent portion 59a of the leading blade drive lever 59, as shown in FIG. Evacuate to the left position. In this case, the notched gear 40 that meshes with the second segment gear 37 rotates counterclockwise, but the control plate 41 has its arcuate protrusion 41b (see FIG. 5) held by the hook portion 42a of the latch lever 42. Since it is latched, counterclockwise rotation due to the biasing force of the torsion spring 38 is prevented. Therefore, only the notched gear 40 rotates counterclockwise again, and as shown in FIG. Move and stop.

On the other hand, the semicircular cam 14 is approximately 60° from the starting position.
After rotating clockwise, if you continue rotating,
The notched gear 20 starts rotating clockwise together with the plate cam 21. This clockwise rotation of the notched gear 20 causes the first segment gear 25 to rotate counterclockwise. This counterclockwise rotation of the first segment gear 25 causes the rear blade drive member 23, which is integrally connected to the first segment gear 25 with the pin 24, to rotate counterclockwise against the biasing force of the rear blade drive spring 27. , the tip of the arm 23B is latched by the tip of the arm 48A of the control lever 48, as shown in FIG. In this case, the tip of the arm 23B of the rear blade drive member 23 contacts the side surface of the arm 48A of the control lever 48, and presses and rotates the control lever 48 clockwise.
The tip of B rotates counterclockwise to release the control lever 48.
At the moment the control lever 48 is removed from the tip of the arm 48A, the control lever 48 is rotated counterclockwise by the biasing force of the torsion spring 51 and returns to its original position. When the notched gear 20 continues to rotate slightly clockwise, the rightmost tooth of the first segment gear 25 in FIG. 6 enters the notched escape portion 20a of the notched gear 20, and the teeth of both gears no longer mesh. . Therefore, the rear blade drive member 23 tries to rotate clockwise together with the first segment gear 25 due to the urging force of the rear blade drive spring 27, but the rotation is prevented by the arm 48A of the control lever 48, and the second segment gear 25 rotates clockwise. The state immediately before the shutter opens and closes as shown in FIG. 6. In this case, the rear blade drive member 2
3, the rear blade group 9 moves in the direction of arrow D (see FIG. 1) and fully opens the shutter aperture 7. But before that,
The charge lever 31 is rotated counterclockwise by the cam plate 21, the leading blade driving member 59 is latched by the leading blade latch lever 55, as shown in FIG. 7 fully closed. Therefore, there is no possibility that a gap will be created between the leading blade group 8 and the trailing blade group 9 and light will leak. Such a relative movement relationship between the leading blade group 8 and the trailing blade group 9 is coupled to each other by the pin 19. It is determined by the positional relationship between the teeth of the notched gear 20 and the cam surface 21a of the cam plate 21.

At the end of the counterclockwise rotation of the rear blade drive member 23, the magnet 50 is energized, attracts the armature iron piece 49, and restrains the control lever 48 in its attracted position. In this state, as shown in FIG. 6, charging of the leading blade drive spring 62 and the trailing blade drive spring 27 has also been completed.

As shown in FIG. 6, just before the semicircular cam 14 rotates 180 degrees from the starting position and the reversible motor 1 stops, a leading blade release signal is applied via the interlocking member driven by the reversible motor 1. This is transmitted to the locking lever 42, and the locking lever 42 rotates clockwise against the biasing force of the torsion spring 44. This rotation of the latch lever 42 releases the engagement between the hook portion 42a and the arcuate protrusion 41b of the control plate 41, so the control plate 41 is rotated counterclockwise by the biasing force of the torsion spring 38. Move the tip blade release lever 5.
3, and rotates the leading blade locking lever 55 clockwise via the eccentric pin 57.
By rotating the leading blade locking lever 55 clockwise, the engagement between its tip 55a and the bent portion 59a of the leading blade driving member 59 is released. Therefore,
The leading blade driving member 59 is released from the restraint and rotates clockwise about the support shaft 61 by the biasing force of the leading blade driving spring 62, causing the leading blade group 8 to travel in the direction of arrow B in FIG. The shutter aperture 7 is opened and exposure is performed.

After a predetermined period of time has elapsed, when the magnet 50 is de-energized, the control lever 48 is rotated clockwise together with the driven lever 47 by the biasing force of the torsion spring 52. By rotating the control lever 48 in the clockwise direction, the arm 48A of the control lever 48 and the arm 23B of the rear blade drive member 23 are disengaged, and the rear blade drive member 23 is moved by the biasing force of the rear blade drive spring 27. Rotates clockwise. Therefore, the rear blade group 9
moves in the direction of arrow E in FIG. 1 to close the shutter aperture 7, and the exposure is completed.

The timing for releasing the rear blade drive member 23, that is, the timing for closing the shutter, is determined by the timing for cutting off the power supply to the magnet 50. However, if the battery is exhausted and the magnet 50 is no longer able to attract and hold the armature iron piece 49, the control lever 48
is not restrained by the magnet 50. In such a case, bearing 4
A driven lever 47 that engages with the control plate 41 via 5
The control lever 48 is thus restrained. That is,
control plate 41 to release the leading blade drive member 59;
When rotates counterclockwise, the bearing 45 provided on the arm 47A of the driven lever 47 rolls along the cam surface 41c of the control plate 41 that rotates counterclockwise, and the driven control lever 48 is moved by the biasing force of the torsion spring 52. Rotates clockwise. Therefore, the control lever 48 also rotates clockwise together with the driven lever 47, and the engagement between the tip of the arm 48A of the control lever 48 and the arm 23B of the rear blade drive member 23 is released, and the rear blade drive member 23 After the leading blade driving member 59 is released, it is released, causing the trailing blade group 9 to travel. In this case, the shutter speed is a constant mechanical speed, but the mechanical speed is adjusted from the time when the leading blade driving member 59 is released so that the mechanical speed becomes the maximum speed of the shutter, for example, 1/1000 to 1/4000. The predetermined delay time until the release timing of the trailing blade drive member 23 is determined by the shape of the cam surface 41c of the control plate 41.

When the rear blade drive member 23 travels clockwise and the exposure is completed, a changeover switch (not shown) is activated by a signal indicating the end of travel of the blade group 9.
The reversible motor 1 starts reversing. This reversible motor 1
Due to this reversal, the semicircular cam 14 rotates counterclockwise from the position shown in FIG. This rotation of the semicircular cam 14 in the counterclockwise direction causes the charge lever 31 having a bearing 34 in contact with the cam surface 14b to
rotates counterclockwise according to the cam lift. Due to this counterclockwise rotation of the charge lever 31, the bearing 36 provided at the tip of the second arm 31B comes into contact with the protrusion 60b of the charge receiver 60, and the leading blade driving member 59 is moved to the leading blade driving spring 62.
When the semicircular cam 14 is rotated counterclockwise against the urging force of , and the semicircular cam 14 is reversed by 180 degrees, it returns to the state shown in FIG. Therefore, the leading blade group 8 moves in the direction C in FIG. 1, and as shown in FIG.
It stops at a position where a part of the rear blade group 7 is covered with the rear blade group 7.

On the other hand, when the charge lever 31 rotates counterclockwise, the second segment gear 37 fixed to the charge lever 31 rotates counterclockwise about the support shaft 32 and meshes with the second segment gear 37. Rotate the notched gear 40 clockwise from the position shown in FIG. Due to this clockwise rotation of the notched gear 40, the protruding step portion 41a of the control plate 41 is moved to the notched step portion 40a of the notched gear 40.
As a result, the control plate 41 rotates clockwise about the support shaft 39 together with the notched gear 40 against the urging force of the torsion spring 38 . By this clockwise rotation of the control plate 41, the arcuate protrusion 41b is latched by the hook 42a of the latching lever 42.

However, in the case of reversal of this semicircular cam 14,
The engagement pin 22 fixed to the cam plate 21 is connected to the pressing claw 1.
As shown in FIG. 7, the pressing claw 15 is brought into contact with the slope 15b provided on the pin shaft 15, as shown in FIG. Therefore, even if the pressing claw 15 comes into contact with the engagement pin 22, it only rotates clockwise and retreats from the rotational trajectory of the engagement pin 22, and the engagement pin 2
2 to pivot around the support shaft 13. Therefore, the cam plate 21 and the notched gear 2
0 remains at that position without rotating counterclockwise, and when the semicircular cam 14 rotates 180° counterclockwise, it returns to the state shown in FIG. 2. In this case, the press claw 15 and the engagement pin 22 constitute a one-way transmission clutch mechanism that transmits rotation only in one direction, and the engagement pin 22 is fixed to the cam plate at an interval of 120°. Therefore, the 180° forward and reverse rotation of the semicircular cam 14 causes the cam plate 21 to rotate by 120° only in the clockwise direction in FIG. Also, this cam plate 2
Along with 1, the notched gear 20 is also rotated 120° from the starting position.
It rotates clockwise and returns to the state shown in FIG. 2.

In the first embodiment described above, one arm 48A of the control lever 48 that engages the rear blade drive member 23 is
and the other arm 48A having an armature iron piece are integrally formed via a bent portion 48a.
Therefore, when the rear blade drive member 23 is rotated counterclockwise and before the tip of its arm 23B climbs over one arm 48A of the control lever 48, the magnet 50 is energized to attract and hold the armature iron piece 49. , there is a risk that the arms 48A and 23B will interfere and damage the shutter device. Therefore, in the first embodiment described above, the magnet 50 is energized after the arm 23B of the rear blade drive member 23 passes over the one arm 48A of the control lever 48 and before the reversible motor 1 stops. Therefore, the timing of energization must be adjusted accordingly.

FIG. 8 is a plan view showing the configuration of a trailing blade drive control lever device that does not require delicate adjustment of the timing of energizing the magnet 50 as described above. Among the members shown in FIG. 8, members having the same functions as those in FIG. 2 are designated by the same reference numerals as in FIG. 2, and detailed explanations thereof will be omitted.

In FIG. 8, a support shaft 39 fixed to the shutter base plate 5 has a notched gear 40 and a control plate 4.
A driven lever 101 that holds a bearing 45 that rolls on its cam surface 41c has a protrusion 101a and is rotatably supported by a support shaft 46. Further, on the support shaft 46, a rear blade latching lever 102 capable of latching the arm portion 23B of the rear blade driving member 23, and a control lever 103 having an armature iron piece 49 at the tip bent portion 103b are rotatable. is maintained.
After that, a torsion spring 1 is attached to the blade latching lever 102.
A locking pin 104 for locking one end of the control lever 103 is installed, and a protrusion 102a that engages with a bent protrusion 103a formed on the control lever 103 is formed.

The driven lever 101 and the rear blade locking lever 102 are biased by a torsion spring 105 so that their respective protrusions 101a and 102a sandwich the protrusion 103a of the control lever 103 from both sides. Further, the control lever 103 is biased by the biasing force of a torsion spring 106 so as to be rotatable clockwise. Note that the torsion spring 105 has a stronger biasing force than the other torsion springs 106, and the control lever 103 resists the biasing force of the torsion spring 106.
When the armature iron piece 49 is attracted by the magnet 50, the driven lever 101 and the trailing blade latching lever 102 are configured to be held in the position shown in FIG. 8 together with the control lever 103. The rear blade drive control lever device in FIG.
When the bearing 45 rotates clockwise with the
rolls according to the cam lift of the cam surface 41c, rotating the driven lever 101 counterclockwise. Following the counterclockwise rotation of the driven lever 101, the rear blade latch lever 102 rotates counterclockwise due to the biasing force of the torsion spring 105, and the bent protrusion engages with the protrusion 102a. Rotate the control lever 103 counterclockwise via 103a,
The armature iron piece 49 is pressed against the magnet 50. Thereafter, the rear blade drive member 23 rotates counterclockwise around the support shaft 26 to charge the rear blade drive spring 27, but at this time, the tip of the arm 23B resists the biasing force of the torsion spring 105. Then, the tip of the rear blade latch lever 102 is pushed away, and it can be rotated further counterclockwise. Therefore, even if the armature 49 is attracted by the energization of the magnet 50 and the control lever 103 is thereby placed in a restrained state, the trailing blade drive member 23 can be rotated counterclockwise without being interfered with by the control lever 103. and is latched by the rear blade latching lever 102,
The rear blade drive spring 27 can be maintained in a fully charged state.

In addition, when releasing the trailing blade, first the control board 41
rotates counterclockwise, but while the control lever 103 is restrained by the magnet 50, the protrusion 101a of the driven lever 101 is rotated counterclockwise.
Since it is engaged with the protrusion 103a of the control plate 41, it does not follow the cam surface 41c of the control plate 41 and remains at that position. Further, the rear blade latching lever 102 also holds the rear blade driving member 23 in the latched state without rotating clockwise. Thereafter, when the magnet 50 is de-energized and the armature iron piece 49 is released from adsorption, the control lever 103 moves the torsion spring 1
06 rotates clockwise together with the rear blade latch lever 102 to release the rear blade drive member 23.

Further, if the battery is exhausted and the armature iron piece 49 is not attracted by the magnet even if the magnet 50 is energized, the control lever 1
03, the trailing blade latch lever 102 and the driven lever 101 rotate clockwise together by the biasing force of the torsion spring 106, and the bearing 45 rolls along the cam surface 41c of the control plate 41. Therefore, after a predetermined mechanical delay time, the trailing blade drive member 23 is released.

FIG. 9 is an enlarged plan view of a shutter charge mechanism section showing a second embodiment of the present invention, and FIG. 10 is a plan view of a shutter aperture section in the second embodiment. 9 and 10 both show the state of the shutter just before the release button is pressed. In order to make the drawings easier to read, only the main parts are shown and other components similar to those in FIG. 1 are omitted. Components having the same functions as those in the embodiment are designated by the same reference numerals as in FIG. 2, and detailed explanations thereof will be omitted.

In FIG. 9, similarly to the first embodiment, the semicircular cam 200 rotated via the gear 3 driven by the reversible motor and the gear train following the gear 3 is connected to the second embodiment.
The semicircular cam 200 is formed to have a larger cam lift than the semicircular cam 14 shown in the figure, and a cam plate 201 is integrally fixed to the semicircular cam 200 by a pin 202. Also, a notched gear 2 rotatably supported by the support shaft 18 together with the semicircular cam 200.
0, there are three engaging pins 22 spaced apart by 120 degrees.
is fixedly installed, and the pressing claw 15 that can engage with the engagement pin 22 is attached to a pin shaft 16 implanted in the semicircular cam 200.
It is rotatably supported by.

A charge lever 2 having a bearing 34 in contact with a semicircular cam 200 at the tip of one arm 203A.
03 is rotatably supported by a support shaft 32, and a bearing 34 is connected to the semicircular cam 2 by a torsion spring 33.
It is biased counterclockwise so as to come into pressure contact with the cam surface of 00 and 200b. The charge lever 20
The bearing 36 provided at the tip of the other arm 203B of the third blade is in pressure contact with the charge receiver 204 fixed to the leading blade drive member 59.

Further, a first pawl 205A, which is hooked by one arm 48A of the control lever 48, is attached to the rear blade drive member 205, which is integrally connected to the segment gear 25 that meshes with the notched gear 20, by the pin 24.
and a second claw 205B are provided. moreover,
An auxiliary lever 207 having a bearing 206 at its tip that can come into contact with the cam plate 201 is connected to the segment gear 25 together with the rear blade drive member 205 by the pin 24.
and is rotatably supported by a support shaft 26. In addition, in FIG. 9, the cam plate 2
01, the auxiliary lever 207 is rotated counterclockwise, and the first pawl 205A of the rear blade drive member 205 is latched by the arm 48A of the control lever 48.

Since the second embodiment is configured as described above,
As shown in FIG. 10, the shutter aperture 7 is closed by the leading blade group 8 before release. Furthermore, the trailing blade group 9 is charged halfway, and the shutter aperture 7 is partially shielded by the leading blade group 8 and the trailing blade group 9. When a release button (not shown) is pressed, the semicircular cam 200 is driven by the reversible motor and begins to rotate clockwise in FIG. 9. This rotation of the semicircular cam 200 causes the bearing 34 to roll according to the cam lift of the cam surface 200b, and the charge lever 203 is rotated clockwise about the support shaft 32 by the biasing force of the torsion spring 33. Due to this clockwise rotation of the charge lever 203, the bearing 36 that is in pressure contact with the charge receiver 204 moves to the left in FIG.
The leading blade group 8 is stopped at the position where the shutter aperture 7 is fully closed as shown in FIG. Furthermore, when the semicircular cam 200 rotates clockwise and rotates 180 degrees from the starting position (the position shown in FIG. 9), as shown in FIG.
The bearing 36 moves to a retracted position outside the rotation range of the leading blade drive member 39.

As the charge lever 203 rotates clockwise, the notch gear 40 that meshes with the segment gear 37 fixed to the charge lever 203 rotates counterclockwise.
1 and away from the protruding step portion 41a. However, the control plate 41 is latched by a latching lever 42, and rotation in the counterclockwise direction is prevented.

On the other hand, when the semicircular cam 200 rotates 60° clockwise from the starting position, the tip 15 of the pressing claw 15
a comes into contact with the engagement pin 22. Furthermore, semicircular cam 2
00 rotates clockwise, the pressing claw 15 pushes the engagement pin 22 forward, so the notched gear 20 rotates clockwise and meshes with the segment gear 25.
This segment gear 25 is rotated counterclockwise. This rotation of the segment gear 25 in the counterclockwise direction causes the rear blade drive member 205 to move toward the auxiliary lever 2.
07, it rotates counterclockwise around the support shaft 26 to charge the rear blade drive spring 27. Semicircular cam 14 or 200 moves 180° from the starting position
By the time the notched gear 20 rotates in the clockwise direction, the notched gear 20 has a notched portion 20a having a tooth pattern removed, so that the notched gear 20 and the segment gear 25 are disengaged from each other. However, just before that, the second pawl of the trailing blade drive member 205 touches the arm 4 of the control lever 48.
It is latched by 8A as shown in FIG. Further, the rear blade group 9 is retracted upwardly outside the shutter aperture 7 in FIG. Therefore, in this state, the shutter aperture 7 is shielded only by the leading blade group 8.

When the semicircular cam 200 rotates 180 degrees clockwise from the starting position, the reversible motor that drives the semicircular cam 200 temporarily stops, but just before it stops, the magnet 50 is energized and attracts the armature iron piece 49 to control it. The lever 48 is restrained. Also, interlocking members driven by the reversible motor (for example, a movable mirror in the case of a single-lens reflex camera)
In response to the movement, the locking lever 42 is activated to release the restraint of the control board 41.

When the control plate 41 is released from the restraint, the control plate 41 rotates counterclockwise around the support shaft 39 due to the biasing force of the torsion spring 38, as in the first embodiment, and the protruding step portion 41a rotates around the support shaft 39. It comes into contact with the tip 53a of the lever 53 and pushes it away. Therefore, the leading blade latch lever 55 rotates clockwise and releases the leading blade driving member 59. Therefore, the leading blade driving member 59 is rotated clockwise by the biasing force of the leading blade driving spring 62, causing the leading blade group 8 to travel downward in FIG. 10 and opening the shutter aperture 7.

When a predetermined delay time elapses after the leading blade drive member 59 is released, the power to the magnet 50 is cut off.
Control lever 48 is released. Therefore, the control lever 48 rotates clockwise around the support shaft 46 due to the biasing force of the torsion spring 52, and the engagement between the arm 48A of the control lever 48 and the second pawl 205 of the trailing blade drive member 205 is prevented. The rear blade drive member 205 is released. The released rear blade drive member 205 is driven by the biasing force of the rear blade drive spring 27.
The segment gear 25 and the auxiliary lever 207 rotate clockwise around the support shaft 26 to move the rear blade group 9 from the retracted position downward in FIG. 10 and close the shutter aperture 7.

Thereafter, at the end of the clockwise rotation of the blade drive member 205, a changeover switch (not shown) is activated.
The reversible motor starts reversing. When the semicircular cam 200 rotates counterclockwise from the position shown in FIG. 11 due to the reverse rotation of the reversible motor, the charge lever 203 rotates counterclockwise in accordance with the cam lift of the semicircular cam 200, as shown in FIG. Move, second arm 20
3B is brought into contact with the charge holder 204, and the leading blade driving member 59 is moved counterclockwise against the biasing force of the leading blade driving spring 62 via the charge holder 204. direction to return to the state shown in FIG. Further, as the charge lever 203 is rotated counterclockwise, the notch gear 40 that meshes with the segment gear 37 rotates clockwise, and the control plate 41 is rotated clockwise against the biasing force of the torsion spring 38. As the control plate 41 rotates in the clockwise direction, the leading blade locking lever 55 also enters into the rotation area of the bent portion 59a of the leading blade driving member 59, as shown in FIG.

On the other hand, as the semicircular cam 200 rotates counterclockwise, the cam plate 201 also rotates counterclockwise, and as shown in FIG. bearing 20
6. When the semicircular cam 200 further rotates counterclockwise, the bearing 206 moves to the cam surface 201.
Since the auxiliary lever 207 is pressed by a, the auxiliary lever 207 rotates counterclockwise in accordance with the cam lift of the cam plate 201. Therefore, the rear blade drive member 205, which is integrally connected to the auxiliary lever 207, also rotates counterclockwise, and its first pawl 205A is hooked to the arm 48A of the control lever 48. After this, the blade driving member 205
By rotating counterclockwise, the rear blade group 9 moves in the direction of opening the shutter aperture 7 (upward in Figure 10), opening the lower part of the shutter aperture 7 slightly as shown in Figure 10. When you are in a state of
A first pawl 205A is hooked onto the arm 48A of the control lever 48. Furthermore, when the semicircular cam 200 rotates 180° counterclockwise from the position shown in FIG. 11, the changeover switch (not shown) is switched to the forward rotation direction again, and at the same time, the reversible motor stops, resulting in the state shown in FIG. , the series of shutter opening and closing operations is completed.

In this second embodiment, the leading blade group 8 begins to close the shutter aperture 7 before the rear blade group 9 begins to open the shutter aperture 7 after the end of exposure, so there is no risk of light leakage. Immediately before pressing the release button, the shutter aperture 7 is fully closed by the leading blade group 8, and at the same time, the shutter aperture 7 is fully closed by the leading blade group 8.
Also, the shutter aperture 7 is kept partially open, and only a portion of the charge of the rear blade drive spring 27 remains in the drive spring for driving the blades. Therefore, the time from pressing the release button to moving the leading blade group is short, and the operation is smooth, which is more advantageous than the first embodiment when photographing a moving subject.

[Effect of idea]

As described above, according to the present invention, immediately after shutter exposure is completed, one of the blades that double shields the aperture is driven by the motor from the exposure completion position to the intermediate position, and when the shutter release operation is performed, the motor drives Drive one group of blades to the initial position,
Since both blade groups are brought to the initial position, the configuration is simple and the space used is reduced. Also, since charging is performed by the motor in two steps, a small motor can be used, its operation is smooth, and the power supply is reduced. Battery consumption can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the first embodiment of the present invention, Fig. 2 is an enlarged plan view of the shutter charge mechanism immediately before shutter release in Fig. 1, and Fig. 3 is a support supporting the terminal gear in Fig. 2. Cross-sectional view of the shaft,
FIG. 4 is an explanatory diagram of the configuration of the one-way transmission clutch portion and the rear blade hooking portion in FIG. 2, and FIG. 5 is an explanatory diagram of the configuration of the cam portion and the leading blade hooking portion in FIG. 2.
FIG. 6 is an explanatory diagram of the shutter charging mechanism of the first embodiment in a state in which the shutter charging is completed, FIG. 7 is an explanatory diagram of the one-way transmission clutch of FIG. 2 when the motor is reversed, and FIG. A plan view showing a different embodiment from FIG. 2 of the blade hooking part,
FIG. 9 is an enlarged plan view of the shutter charge mechanism immediately before shutter release showing a second embodiment of the present invention, FIG. 10 is a plan view of the shutter aperture portion in the second embodiment, and FIG. FIG. 12 is an explanatory diagram showing a state in which the leading blade group and the trailing blade group are moving after the shutter exposure is completed in the second embodiment. Explanation of symbols of main parts, 1...Reversible motor, 7
...Shaft aperture, 8...Lead blade group, 9...
... Rear blade group, 14, 201 ... Cam means, 15,
22...clutch means, 20, 25, 21, 31
C, 35...Charge means, 31A, 207...
lever means.

Claims (1)

[Claims for Utility Model Registration] 1. A leading blade group consisting of a plurality of divided blades and movable between an initial position that covers the entire aperture and an exposure completion position that opens the entire aperture, and a plurality of divided blades. It has a rear blade group that is movable between an initial position that opens the entire aperture and an exposure completion position that covers the entire aperture, and before the shutter release operation is performed, the leading blade group and the rear blade group open the aperture. When the shutter release operation is performed, the trailing blade group retracts to the initial position, and then the leading blade group and the trailing blade group move from the initial position to the exposure completion position by the respective drive springs. The leading blade group sequentially travels under the biasing force to perform the exposure operation, and when the exposure operation is completed, the leading blade group returns to the position covering the aperture in response to the exposure operation.
Again, in a camera shutter in which the aperture is covered twice by a group of leading blades and a group of trailing blades, there is a single motor 1 that rotates when the exposure operation is completed and when the shutter release is operated, and a first motor that operates integrally with the leading blade group. a driving member 59; a first driving spring 62 that biases the first driving member so that the leading blade group travels from the initial position to the exposure completion position; and a second driving member that operates integrally with the trailing blade group. 23, 205; a second drive spring 27 that biases the second drive member so that the rear blade group travels from the initial position to the exposure completion position; and either of the first drive member and the second drive member. a first charge member 31, 20, 201 that moves one of the drive members 59, 205 against the biasing force of a drive spring that biases the one drive member; a second charge member 20, 203 that moves the other drive member 23, 59 against the biasing force of a drive spring that biases the other drive member; Engagement parts 60a, 59a, 205A, 205
B, when the first charge member moves the one drive member and the blade group that operates integrally with the one drive member is moved from the exposure completion position to an intermediate position that partially covers the aperture; One that enters into the travel locus of the first engaging portion formed on one drive member and locks the one drive member to maintain the blade group that operates integrally with the one drive member at an intermediate position. , when the first charge member moves the one driving member and the blade group that operates integrally with the one driving member is moved from the intermediate position to the initial position, the first charge member formed on the one driving member a first locking member 55, 48 that enters the travel trajectory of the second engaging portion and locks the one drive member, and maintains the blade group that operates integrally with the one drive member at an initial position; When the second charge member moves the other driving member and the blade group that operates integrally with the other driving member is moved from the exposure completion position to the initial position, locking the other driving member, a second locking member 48, 55 that operates integrally with the other drive member to maintain the blade group in the initial position; and in response to a shutter release operation, the first locking member moves the second engaging portion. Unlocking means 41 that performs unlocking of the one driving member by retreating from the trajectory and unlocking of the other driving member by the second locking member at predetermined exposure time intervals; , 50, transmitting the rotation of the motor to the first charge member in response to the completion of the exposure operation, and moving a group of blades that operate together with the one drive member from the exposure completion position to an intermediate position; In response to a shutter release operation performed, the rotation of the motor is transmitted to the first charge member to move a group of blades that operate integrally with the one drive member from an intermediate position to an initial position, while the shutter release is performed. Transmission means for transmitting the rotation of the motor to the second charge member in response to either the operation or the completion of the exposure operation to move a group of blades that operate together with the other drive member from the exposure completion position to the initial position. 15,200, and before the shutter release operation, the blade group that operates integrally with the one driving member is in an intermediate position, and the blade group that operates integrally with the other driving member moves the aperture. An automatic camera shutter winding device characterized in that the aperture is covered completely and the aperture is covered twice with both groups of blades. 2 Utility Model Registration Scope of Claims In the device according to claim 1, the first charge member 31 applies a biasing force to the first drive member 59, and the second charge member 20 applies a biasing force to the second drive member 23. The transmission means transmits the rotation of the motor to the second charge member 20 in response to a shutter release operation, and moves the rear blade group from an exposure completion position to an initial position. A device characterized by the following: 3 Utility Model Registration Scope of Claims In the device according to claim 1, the first charge members 20 and 201 move the second drive member 205, and the second charge member 203 moves the first drive member 59, respectively. The transmission means transmits the rotation of the motor to the second charge member 203 in response to completion of the exposure operation, and moves the leading blade group from the exposure completion position to the initial position. A device that does this.