JPH055539Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application 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.

[Problems to be solved by conventional technology and inventions] Conventionally, as a control mechanism for this type of electric shutter, an opening iron lever and a closing iron lever are set separately, or an opening iron lever is set and the control mechanism is controlled by the opening iron lever and the closing iron lever. There are known devices in which the opening iron lever sets the closing iron lever, but these all suffer from variations in component dimensions, resulting errors in the set locking position, and separation springs for the opening iron lever and the closing iron lever. Due to the difference in strength, etc., it was difficult to balance the pressing force of each iron piece against the iron core of the opening iron piece lever and the closing iron piece lever during setting.
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 this is within the permissible range when shuttering, it becomes a problem when controlling high-speed seconds such as 1/4000 seconds.

In view of the above points, the present invention has been developed so that even if there are variations in component dimensions, errors in the set position, and differences in the strength of the separation springs between the open and close iron levers, the opening and closing iron levers will be The purpose of the present invention is to provide a control mechanism for an electric shutter that can suppress variations in the timing of separation of the iron pieces within an allowable range even during high-speed shuttering by constantly maintaining the balance of the pressing force of the iron pieces against the iron core. shall be.

[Means and actions for solving problems]

The purpose of this is to ensure that the opening side electromagnetic device, iron piece lever, etc. mechanism and the closing side electromagnetic device, iron piece lever, etc. mechanism are configured the same or symmetrically, and also that the crimping positions of the opening iron piece lever and the closing iron piece lever are adjusted at the time of setting. It has a hold plate that is rotatably arranged around an axis that is approximately the same distance from the shutter, and a hold lever that is set by the shutter charge mechanism, and an open iron piece lever and a closed iron lever that are rotatably mounted on the hold lever. A holding plate that applies a pressing force greater than the force of the separation spring to the iron piece lever and absorbs an overset of the hold lever, and makes the pressing force on the opening iron piece lever and the closing iron piece lever almost equal. This problem was solved by an electric shutter control mechanism that magnetically attracts the two iron levers to each electromagnetic device under the same conditions, and suppresses variations in the timing of the iron piece separation within an allowable range even at high speeds. be done.

〔Example〕

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, 3 is a closing driving electromagnetic coil similar to the electromagnetic coil 2, and 4 is an opening iron piece lever arranged so as to be rotatable around a shaft 5, and a boss that 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). 4b, and is given dextrorotation by a separation spring 6. Reference numeral 7 denotes an open iron lever 4 that is rotatably arranged around a shaft 8.
This is a closing iron piece lever constructed symmetrically with the iron piece 7a, which is to be attracted or crimped to the iron core 1 by the magnetic force of the electromagnetic coil 3, and a boss 7b for pushing a closing locking lever (not shown). At the same time, a separation spring 9 imparts levorotation. 10 is axis 1
The hold lever is rotatably disposed around the holding lever 1, has a pin 10a at its free end, has a locking portion 12b, and is given dextrorotation by a spring 13. Reference numeral 15 denotes a hold plate made of a leaf spring rotatably mounted on the pin 10a of the hold lever 10, and arms 15a, 15 on both sides thereof.
When set, the protrusions 4c and 7c of the opening iron lever 4 and the closing iron lever 7 are pushed to press the iron pieces 4a and 7a onto the iron core 1, respectively. Reference numeral 16 denotes a release lever that is rotatably arranged around the shaft 5, and has a hook portion 16a that can engage with the locking portion 12b of the hold lever 10, and is given levorotation by a spring 17. ing. 18 is a stopper for the arm portions 15a, 15b of the holding plate 15.

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. and is in contact with an opening locking lever and a closing locking lever (not shown). Also, the hold lever 10 is supported by a spring 13.
However, the right rotation is restricted by the arm portions 15a and 15b of the holding plate 15 coming into contact with the stopper 18. When a set member (not shown) is operated from this state, the hold lever 10 is rotated to the left, and in this case, the spring rigidity of the hold plate 15 becomes
The holding plate 15 is selected so that it does not bend depending on the strength of the arms 15a and 15b, and the protrusions 4c and 7c
Push the open iron piece lever 4 and the closing iron piece lever 7 that push the iron piece levers to the set position, that is, the position where the iron pieces 4a and 7a of each iron piece lever are crimped to the iron core 1 as shown in FIG. When the lever is turned to the left, the arm 1 of the hold plate 15
5a and 15b press the respective iron levers 4 and 7 and are bent by the reaction force at that time, and their locking portions 12b are locked by the hook portion 16a of the release lever 16 (see FIG. 2). In addition, in this state, the hold lever 10 is attached to the arm portions 15a, 15.
It is overset by the amount of deflection b. Here, if the opening drive lever, the closing drive lever, the opening locking lever, and the closing locking lever are configured under the same conditions, the force of the separation spring 6 for adjusting the time is
By adjusting F _A or the force F _B of the separation spring 9, when the time is correct, F _A = F _B , and the point of action of the arm portion 15a of the holding plate 15 from the rotating shaft 5 of the opening iron lever 4 Since the distance _L1 from the rotation axis 8 of the closing iron lever 7 to the point of action of the arm 15b of the holding plate 15 is equal, the opening iron lever ₄ by the arm 15a of the holding plate 15 is equal.
The amount of pressing force applied to the iron piece 4a to the set position and the amount of pressing force applied to the iron piece 7a of the closing iron lever 7 to the set position by the arm portion 15b of the holding plate 15 are the same as those of the pin 10a.
distance L ₂ from the point of action of the arm 15a of the hold plate 15 on the opening iron lever 4 and from the pin 10a to the closing iron lever 7 of the arm 15b of the hold plate 15.
The distance _L3 to the point of application to the pin 10a is the same, and the holding plate 15 is mounted on the pin 10a so as to be freely rotatable, 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 hold lever 10, and the arm portions 15a and 15b of the hold plate 15 are released by the action of the spring 13. is returned to its pre-set position in contact with the stopper 18 (see Figure 3),
After that, when a predetermined period of time has elapsed, the electromagnetic coil 2
and 3 are sequentially cut 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, and thereby the boss 4b of each iron lever 4 and 7 is turned off. , 7b actuates an open lock lever, a close lock lever, an open drive lever, a close drive lever, etc. (not shown),
In this way, the shutter blade opens and closes, one exposure operation is completed, and the state returns to that shown in FIG.

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.

[Effect of idea]

As described above, according to the present invention, the mechanism such as the electromagnetic device on the opening side, the iron piece lever, etc. and the mechanism such as the electromagnetic device, iron piece lever, etc. on the closing side are constructed in the same or symmetrical manner, and furthermore, the opening side iron piece lever is It has a hold plate that is rotatably arranged around an axis that is approximately the same distance from the crimping position of the closing iron lever, and a hold plate that is set by a shutter charge mechanism and a hold plate that is rotatably mounted on the hold lever. It includes a hold plate that applies a large pressing force to the cage opening iron lever and the closing iron lever by the force of the separation spring and absorbs the overset of the hold lever. By making the pressure almost equal, the two iron levers are magnetically attracted to each electromagnetic device under the same conditions, so there is no possibility of variations in component dimensions, errors in set position, or separation of the opening iron lever and the closing iron lever. Even if there is a difference in spring force, etc., the pressing force of the opening iron piece lever and the closing iron piece lever against the iron core can be made almost equal during setting, and even in high-speed shutter speeds, variations in the timing of separation of the iron pieces, i.e. It is possible to suppress variations in shutter speed 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 ... Hold lever, 13, 17 ... 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. , iron piece levers and other mechanisms are configured the same or symmetrically, and furthermore, a hold lever is set by the shutter charge mechanism, and the opening iron piece lever is used to press the opening iron piece lever and the closing iron piece lever to each of the electromagnetic devices when set. and a hold plate rotatably disposed on an axis on the hold lever at approximately the same distance from each point of application to the closing iron lever, the holding plate being rotatably disposed on an axis on the holding lever, the holding plate being substantially the same distance from each point of application to the closing iron lever. A control mechanism for an electric shutter, characterized in that it has a pressing force greater than the force of a separation spring, and has spring characteristics that absorb overset of the hold lever.