JPH043301Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a control mechanism for an electric shutter in which the opening and closing of the shutter blades are controlled by separate electromagnetic devices.

Prior Art Conventionally, the control mechanisms for this type of electric shutter include those in which the opening iron lever and the closing iron lever are set separately, those in which the opening iron lever is set and the opening iron lever is thereby closed, and the iron lever is set. However, all of these problems occur due to variations in the dimensions of the parts, errors in the set locking position caused by this, and differences in the force of the release springs between the opening iron piece lever and the closing iron piece lever, etc. It was difficult to balance the pressing force of each iron piece of the lever and the closing iron piece lever against the iron core.
If this pressing force is not balanced between the opening side and the closing side, there will be a difference in the adsorption state of the iron piece, which will cause variations in the timing of the separation of the iron pieces, and this variation will occur at 1/1000 seconds and 1/2000 seconds. Although the shutter speed is within the permissible range, it becomes a problem when controlling high speed speeds such as 1/4000 seconds.

Purpose In view of the above points, the present invention has been developed so that the opening iron lever and the closing iron lever can be easily adjusted even when there are variations in component dimensions, errors in the setting position, differences in force of the separation springs between the opening iron piece lever and the closing iron piece lever, etc. To provide a control mechanism for an electric shutter that can suppress variations in the timing of separation of iron pieces within an allowable range even during high-speed shuttering by always maintaining a balance in the pressing force of each iron piece on the iron core. It is an object.

Overview The purpose of this is to have the electromagnetic device, iron lever, etc. on the opening side and the electromagnetic device, iron lever, etc. on the closing side configured to be the same or symmetrical, and furthermore, when setting, the opening iron lever and the closing iron lever are A first hold lever having a hold plate rotatably arranged around an axis located at approximately the same distance from the crimping position, a second hold lever set by a shutter charge mechanism, and a first hold lever. a spring that is stretched between the second hold lever and applies a pressing force greater than the force of the separation spring to the opening iron piece lever and the closing iron piece lever, and absorbs an overset of the second hold lever; By making the pressing force on the open iron lever and the closing iron lever almost equal, the two iron levers can be magnetically attracted to each electromagnetic device under the same conditions, and the iron piece can be separated even at high speeds. This problem is solved by an electric shutter control mechanism that suppresses timing variations within an allowable range.

Embodiment The present invention will be described below based on an embodiment shown in the drawings. In FIG. 1, 1 is an iron core, 2 is an opening driving electromagnetic coil, and 3 is a closing driving electromagnetic coil similar to the electromagnetic coil 2. , 4 is an opening iron piece lever arranged rotatably around a shaft 5, which pushes an iron piece 4a to be attracted or crimped onto the iron core 1 by the magnetic force of the electromagnetic coil 2, and an opening locking lever (not shown). It has a boss 4b that rotates, and is given dextrorotation by a separation spring 6. Reference numeral 7 designates a closed iron lever 7 that is configured symmetrically with an open iron lever 4 that is rotatably disposed around a shaft 8, and a closed iron lever 7a that is to be attracted or crimped to the iron core 1 by the magnetic force of the electromagnetic coil 3. It has a boss 7b for pushing a closing locking lever (not shown), and is given levorotation by a separation spring 9. Reference numeral 10 denotes a first hold lever that is rotatably arranged around a shaft 11, and has a pin 10a at its free end and a notch 10b. 1
A second hold lever 2 is rotatably arranged around the shaft 11, and has a stopper 12a that can engage with the notch 10b and a locking portion 12b, and is rotated in right rotation by a spring 13. has been granted.
Reference numeral 14 designates the first and second hold levers 10 and 1 so as to impart levorotatory properties to the first hold lever 10 and dextrorotatory properties to the second hold lever 12, respectively.
2, a hold spring 15 is a hold plate rotatably mounted on the pin 10a of the first hold lever 10;
a and 15b push the protrusions 4c and 7c of the opening iron lever 4 and the closing iron lever 7, respectively, to press the iron pieces 4a and 7a onto the iron core 1. Reference numeral 16 denotes a release lever rotatably arranged around the shaft 5, and a second hold lever 12
It has a hook portion 16a that can be engaged with the locking portion 12b of , and is given levorotation by a spring 17. 18 is the arm portion 15a, 1 of the hold plate 15
This is a stopper for 5b.

Since the present embodiment is constructed as described above, before setting (see FIG. 1), the opening iron lever 4 and the closing iron lever 7 are pulled to the illustrated positions by the separation springs 6 and 9, respectively. It is in contact with an opening locking lever and a closing locking lever (not shown). Further, the first hold lever 10 is connected to the second hold lever 12 by a hold spring 14.
The left rotation is caused by the stopper 12 of the second hold lever 12.
limited by a through a notch 10b;
Moreover, the first hold lever 10 and the second hold lever 12 are integrally urged by a spring 13 to rotate to the right. is restricted by contacting the When a set member (not shown) is operated from this state, the second hold lever 12 is rotated to the left, and at the same time, the first hold lever 10 is rotated to the left by following the second hold lever 12 due to the tension of the spring 14. , the force of the spring 14 is selected to be larger than the force of the separation springs 6 and 9, so that the holding plate 15 can be moved to the protrusion 4 by its arms 15a and 15b.
c and 7c, the opening iron lever 4 and the closing iron lever 7 are pushed to the set position, that is, to the position where the iron pieces 4a and 7a of each iron lever are crimped to the iron core 1, as shown in FIG. When the second hold lever 12 is further rotated to the left,
Since the first hold lever 10 does not rotate because the iron levers 4 and 7 are crimped to the set position via the hold plate 15, only the second hold lever 12 rotates to the left, and its locking portion 12b is locked by the hook portion 16a of the release level 16 (see FIG. 2). In addition, in this state, the second hold lever 12 is attached to the first hold lever 10 such that the stopper 12a is spaced apart from the notch 10b.
It is more overset. Here, an opening drive lever, a closing drive lever, an opening locking lever,
If the closing locking lever is configured under the same conditions,
By adjusting the force F _A of the separation spring 6 or the force F _B of the separation spring 9 to adjust the second time, when the second time is set, F _A = F _B , and the rotating shaft 5 of the opening lever 4 Since the distance L ₁ from the point of action of the arm portion 15a of the hold plate 15 to the point of action of the arm portion 15a of the hold plate 15 is equal to the distance L ₄ from the rotation axis 8 of the closing iron lever 7 to the point of action of the arm portion 15b of the hold plate 15,
Iron piece 4 of opening iron piece lever 4 by arm part 15a of 5
The amount of force applied by the arm 15b of the holding plate 15 to the set position of the iron piece 7a of the closing iron piece lever 7 is the amount of force applied by the arm 15b of the holding plate 15 to the set position of the pin 10a to the opening iron piece lever 4 of the arm 15a of the holding plate 15. The distance L ₂ to the point of action is equal to the distance L ₃ from the pin 10a to the point of action of the arm 15b of the hold plate 15 on the closing iron lever 7, and the hold plate 15
are mounted on the pin 10a so that they can rotate freely, so that they are equal to each other. When the shutter release operation is performed from this state, the electromagnetic coils 2 and 3 are energized, and thus the iron piece 4a of the opening iron piece lever 4 and the iron piece 7a of the closing iron piece lever 7 are each attracted and held by the iron core 1. Thereafter, the release lever 16 is rotated to the right by a member (not shown), so that its hook portion 16a is disengaged from the locking portion 12b of the second hold lever 12, and therefore the first hold lever 10 and the second hold lever 12 is a spring 13 that is integrated with the first hold lever 10 in contact with the stopper 12a of the second hold lever 12 through the notch 10b.
As a result of this action, the arms 15a and 15b of the holding plate 15 are returned to their pre-setting positions in contact with the stopper 18 (see Fig. 3), and after a predetermined period of time has elapsed, the electromagnetic coils 2 and 3 are energized. When the iron levers 4 and 7 are sequentially shut off, the opening iron lever 4 and the closing iron lever 7 are returned to their pre-setting positions by the action of the separation springs 6 and 9, whereby the bosses 4b and 7b of each iron lever 4 and 7 (not shown) The opening locking lever, the closing locking lever, the opening driving lever, the closing driving lever, etc. are operated, and the shutter blade opens and closes to complete one exposure operation and the first exposure operation is completed.
Return to the state shown in the figure.

In addition, in the above explanation, the electromagnetic coil and iron core,
Although the opening iron lever and the closing iron lever are formed symmetrically, they may be formed identically.Also, an attraction magnet using an electromagnetic coil is used, but the combination magnet is not limited to this. It is also possible.

Effects of the invention As described above, according to the invention, the mechanisms such as the electromagnetic device and the iron piece lever on the opening side and the mechanisms such as the electromagnetic device and the iron piece lever on the closing side are constructed in the same or symmetrical manner. A first hold lever having a hold plate rotatably arranged around an axis located at approximately the same distance from the crimping positions of the opening iron piece lever and the closing iron piece lever, and a second hold lever set by a shutter charge mechanism. is stretched between the first hold lever and the second hold lever, and applies a pressing force greater than the force of the separation spring to the opening iron piece lever and the closing iron piece lever, and the pressing force of the second hold lever. and a spring that absorbs overset, and by making the pressing force on the opening iron lever and the closing iron lever almost equal, the two iron levers are magnetically attracted to each electromagnetic device under the same conditions. Because of this, even if there are variations in component dimensions, errors in the setting position, differences in force of the separation springs between the opening iron piece lever and the closing iron piece lever, etc., the iron core of each iron piece of the opening iron piece lever and the closing iron piece lever during setting will be It is possible to make the pressing forces approximately equal, and even at high speed shutter speeds, it is possible to suppress variations in the timing of separation of the iron pieces, that is, variations in shutter speeds, to within an allowable range, which is extremely effective.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the electric shutter control mechanism according to the present invention in a state before it is set;
The figure is a plan view showing the set state of the embodiment shown in FIG.
FIG. 3 is a plan view showing the released state of the embodiment of FIG. 1. 1... Iron core, 2, 3... Electromagnetic coil, 4...
Opening iron piece lever, 5, 8, 11... shaft, 6, 9...
... Separation spring, 7 ... Closing iron piece lever, 10 ... First hold lever, 12 ... Second hold lever, 13, 17 ... Spring, 14 ... Hold spring, 15 ... Hold plate, 16 ... ...Release lever, 18...stopper.

Claims (1)

[Scope of Claim for Utility Model Registration] In a control mechanism for an electric shutter in which the opening and closing of the shutter blades are controlled by separate electromagnetic devices, an electromagnetic device on the opening side, a mechanism such as an iron lever, and an electromagnetic device on the closing side. , the mechanism such as the iron piece lever is constructed in the same or symmetrical manner, and furthermore, in order to press the opening iron piece lever and the closing iron piece lever to each of the electromagnetic devices mentioned above at the time of setting, approximately from the point of action to the opening iron piece lever and the closing iron piece lever. A first hold lever having a hold plate rotatably disposed on a shaft at the same distance, a second hold lever set by a shutter charge mechanism, and a first hold lever and a second hold lever. It is characterized by including a spring stretched between the two holding levers, which applies a pressing force greater than the force of the separation spring to the opening iron lever and the closing iron lever, and which absorbs the overset of the second hold lever. A control mechanism for electric shutters.