JPS5839450Y2 - programmable shutter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a programmable shutter, and is particularly designed to facilitate obtaining a high speed.

Embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 designates a release lever which is pivotally attached to a shaft 2 and given left rotation by a spring 3, and forms a hook 1a.

Reference numeral 4 designates a set lever which is given a leftward movement habit by a spring 5, and forms a bend 4a that is engaged with the hook 1a, another bend 4b, and an arm 4C94d.

Reference numeral 6 denotes an opening/closing lever pivotally attached to a shaft 7, which has a pin 6a restrained by the arm 4C and another pin 6b implanted therein, and forms the arm 6C.

8 is the aperture. Reference numeral 9 denotes a shutter blade, one of which is one of the two blades, which also serves as an aperture blade, and has a fulcrum pin 9a planted therein and a slot 9b into which a pin 6b is fitted.

Reference numeral 10 denotes a closing drive lever which is pivotally mounted on a shaft 11 and given dextrorotation by a spring 12;
A pin 10a that is restrained by the opening and closing lever 6 and a pin 10b that can push the arm 6C of the opening/closing lever 6 are implanted, and the end face 10C
9, forming a circumferential surface 10d.

13 is a spring that acts as a driving force source for the opening/closing lever 6;
One end is hung on the lever 6, and the other end is the closing drive lever 10.
It is hung on.

14 is a hold release lever pivotally attached to the shaft 11, which forms an arm 14a that engages with the bend 4b of the cellar I lever 4, and has two pins 14b implanted therein.

Reference numeral 15 denotes an iron piece lever pivotally mounted on a shaft 16, and has an arm 15a and a bending arm 15b that engage with the end surface 10C of the closing drive lever 10.
, forming a contact portion 15C.

An electromagnet 17 is connected as a load to an electric shutter circuit (not shown) and can attract and hold the armature 15C.

18 is a hold spring, one end 18a engages with the fixing pin 19, the other end 18b engages with the pin 14b to give levorotation to the hold release lever 14, and the intermediate part 18C engages with the bending pin 15b. The armature lever 15 is given dextrorotation so that the armature portion 15C comes into contact with the electromagnet 17.

When the release lever 1 is rotated to the right against the tension of the spring 3 from the set state shown in the figure, the power switch of the electric shutter circuit (not shown) is first closed, and the electromagnet 17 is energized to attract and hold the iron piece lever 15. Then, the hook 1a comes off the bend 4a and the set lever 4 moves to the left by the tension of the spring 5.

This movement causes the bending member 4b to push the arm 14a and rotate the hold release lever 14 to the right against the tension of the spring 18.

As a result, the intermediate portion 18C of the hold spring 18 separates from the bend 15b of the iron piece lever 15.

Further, the closing drive lever 10 can be rotated to the right due to the displacement of the arm 4d, but the iron piece lever 15 which is attracted and held by the electromagnet 17
Since the end surface 10C is restrained by the arm 15a, it remains in the position shown.

Subsequently, when the arm 4C comes off the pin 6a, the opening/closing lever 6 is rotated to the right by the tension of the spring 13, and the delay circuit in the electric shutter circuit starts operating, and the engagement between the pin 6b and the thrower 9b The shutter blade 9 is opened.

When the electromagnet 17 is demagnetized after a predetermined period of time, the closing drive lever 10 pushes the arm 15a at the end face 10C by the tension of the spring 12, and rotates the iron piece lever 15 to the left while rotating to the right.

As a result of this clockwise rotation, the drive lever 10 contacts the pin 10b and the arm 6C, causing the opening/closing lever 6 to rotate counterclockwise from the middle or final range of its clockwise rotation.

As a result, the shutter blade 9 is closed in the middle of opening or from the fully open position.

Setting from this state of completion of operation is performed by moving the set lever 4 to the right against the tension of the spring 5 and engaging the bent 4a with the hook 1a of the release lever 1.

That is, first, the arm 4C faces the range of motion of the pin 6a and prevents the opening/closing lever 6 from rotating clockwise, and then the arm 4d hooks the pin 10a and rotates the closing drive lever 10 counterclockwise against the tension of the spring 12. On the other hand, the hold release lever 1 is released due to the displacement of the bending 4b.
4. Allows for left rotation.

The iron piece lever 15, whose tip end of the arm 15a rests on the circumferential surface 10d of the closing drive lever 10, releases the spring 1 when the end surface 10C faces @15a due to left rotation of the lever 10.
The bending part 15b is pushed by the tension of 8 and rotates to the right (at this time, the hold lever 14 rotates to the left).
7.

Through the above steps, the maintenance is restored to the state shown in the figure.

If we consider the case where one end 13a of the spring 13, which is the source of the right-handed turning force of the opening/closing lever 6, is hung on a fixing pin implanted in the shutter plate, for example, in this case, a particularly high speed is obtained. Moreover, the closing characteristic of the shutter blade 9 becomes gradual.

That is, the spring force source in this case tends to act most strongly at the beginning of the clockwise rotation of the opening/closing lever 6, and gradually weakens.

Therefore, during high-speed time control, the electromagnet 17 immediately demagnetizes, the closing drive lever 10 rotates clockwise to the maximum, and the pin 10b moves the opening/closing lever 6 with the spring 12 fully extended and its force source at its weakest. At the beginning of right rotation, the opening/closing lever 6 comes into contact with the arm 6C.
This is because the shutter blade 9 is forced back and the shutter blade 9 is closed.

Also, in either state, when the closing drive lever 10 turns to the right, the spring is charged.

In contrast, in the present invention, one end 13a of the spring 13 is hung on the second pin 10b of the closing drive lever 10'', making it easier to obtain a high speed and quick closing characteristics.

That is, the spring 13 also acts as a right-handed turning force source for the closing drive lever 10 until the pin 10b comes into contact with the arm 6C;
This is because at the stage when the pin 10d comes into contact with the arm 6C, the spring 13 almost loses its tension and the opening/closing lever 6 becomes unloaded with respect to the clockwise rotation of the closing drive lever 10.

As described above, in the programmable shutter of the present invention, one end of the spring, which is the source of the opening force of the opening/closing member, is hooked to the closing drive member, so not only can a high speed time be obtained easily, but also the opening/closing member and the closing drive member can avoid severe collisions with
The performance of this type of shutter can be further improved.

[Brief explanation of the drawing]

The drawing is an explanatory diagram showing an embodiment of the present invention in a set state. 6... Opening/closing lever, 10... Closing drive lever 13... Spring.

Claims (1)

[Scope of utility model registration request] an opening/closing lever that can open and close a shutter blade that also serves as an aperture blade; and a closing drive lever that can engage the opening/closing lever and is pressed so that the opening/closing lever can be moved in the shutter blade closing direction when engaged with the opening/closing lever. and one end is hooked on the opening/closing lever and the other end is hooked on the closing drive lever so as to be able to press the opening/closing lever in the shutter blade opening direction and the closing drive lever in the direction in which it should be engaged with the opening/closing lever. and a spring disposed in the shutter, wherein the spring is arranged so as to lose its driving force when the closing driving lever engages with the opening/closing lever.