JPH059708Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention particularly relates to a rattling mechanism for a focal plane shutter that eliminates rattling at the time of blade start in a longitudinally running focal plane shutter.

<Prior Art> Conventionally, backlash at the time of blade start in a focal plane shutter has been removed by adjusting the backlash using two springs. That is, in FIG. 6, two springs, a leading blade arm spring 020A and a trailing blade arm spring 020B, are used individually as drive sources for moving the leading blade arm B07 and the trailing blade arm B015 to correct the play. I was doing a gathering.

<Problems to be solved by the invention> When two springs, namely the leading blade arm spring 020A and the trailing blade arm spring 020B, are used to move the leading blade arm B07 and the trailing blade arm B015, the axis B09 and the axis D017 are moved. Not only does it require space in the thrust direction for winding, making it difficult to assemble, but it also has the disadvantage that the leading blade is 0.
2. Even after the start of trailing blade 03, the leading blade arm B0
7 and the rear blade arm B015, which had a drawback that it exerted a left-turning force on the blade arm B015 and adversely affected the running of the blade. There are also some that use rubber to create looseness, but in this case there is a problem of instability due to temperature changes, etc.

<Means for solving the problem> Therefore, the present invention provides the leading arm spring 020
By replacing A and the trailing blade arm spring 020B with one arm spring 20, the leading blade arm B
7. The purpose is to provide a rattling mechanism that is easy to assemble by moving the rear blade arm B15.

<Function> Before the leading blade 2 starts, the arm spring 20 presses the protrusion 7a of the leading blade arm B7, and after the leading blade 2 starts, the trailing blade arm B
By pressing the same arm spring 20 against the protrusion 15a of No. 15, the leading blade and trailing blade arms B7, 15
A left rotation force is applied to the wheel, and the rattling is performed.

<Example> Figures 1 to 5 showing an example of the present invention will be described below. In the figure, 1 is the shutter board;
A hole 1a for exposure is formed. 3 is the trailing blade, and the remaining trailing blade groups are omitted. 3
is the trailing wing; the rest are similarly omitted. 4 is the tip arm A, with a caulking pin 5 at one end.
The leading blade 2 is rotatably mounted, the other end is pivotally connected to the shaft A6, and a hole 4a is formed in the center.
Reference numeral 7 denotes a leading blade arm B, to which the leading blade 2 is rotatably attached to one end with a caulking pin 8, the other end is pivotally connected to a shaft B9, and a protrusion 7a is formed below the other end. Reference numeral 10 denotes a leading blade drive arm, which rotates around an axis A6, and has a pin 10a planted downward at one end.
is loosely fitted into the hole 4a, and a left turning force is applied by a drive spring 11, but it is normally stopped by a stopper (not shown). Here, 1b is an escape groove for the downward pin 10a provided on the substrate 1.

12 is the rear blade arm A, with a caulking pin 1 at one end.
3, the rear blade 3 is rotatably attached, and the other end is attached to the shaft C1.
4, and a hole 12a is formed in the center. Reference numeral 15 denotes a rear blade arm B, to which the rear blade 3 is rotatably attached to one end with a caulking pin 16, the other end is pivotally connected to a shaft D17, and a protrusion 15 is provided below the other end.
a is formed. Reference numeral 18 denotes a rear blade drive arm, which rotates around an axis C14, has a pin 18a planted downward at one end and loosely fits into a hole 12a, and is given a left-turning force by a drive spring 19. However, like the leading blade drive arm 10, it is normally stopped by a stopper (not shown). Here, 1c is an escape groove for the pin 18a. Reference numeral 20 denotes a leaf spring as an arm spring, which is fixed in an appropriate manner using shafts B9 and D17, and its left side view in FIG. 1 is shown in FIG.

In such a configuration, before the leading blade 2 starts, the tip 20a of the leaf spring 20 is connected to the leading blade arm B.
Since the protrusion 7a of No. 7 is pushed rightward, the leading blade arm B7 receives a left turning force, and the leading blade arm A4 connected via the leading blade 2 similarly receives a left turning force. For this reason, the downward pin 10a of the leading blade drive arm 10 is stopped by a stopper (not shown).
is brought into contact with the lower surface of the hole 4a, and for example, a looseness adjustment is performed to remove the looseness of each connecting portion such as the pins 5, 8, etc.

When the leading blade 2 starts, the leading blade arm B7 rotates to the left as shown in FIG. Arm B
The plate spring 20 comes into contact with the protrusion 15a of 15. Therefore, since a left turning force is applied to the rear blade arm B15 and the rear blade arm A12, the pin 18a of the rear blade drive arm 18 is
engages with the left side of the hole 12a, and looseness is achieved. After the start of the rear blade 3, the leaf spring 20
Since there is no contact with the protrusion 15a, the leaf spring 2
0 does not adversely affect the running of the trailing blade.

In the above, the looseness correction using the leaf spring 20 has been explained, but as shown in FIG.
and rear blade arm B15 with one coil spring 21.
It is also possible to do so. In this case, the protrusion 7
As shown in the side view of FIG.
Since the amount of movement of the leading blade 2 and trailing blade 3 is limited by b, the running is not adversely affected after the leading blade 2 and trailing blade 3 start.

<Effects of the invention> Not only can both the leading blade and the trailing blade be rattled sequentially using one spring, but after the necessary rattling, no force is applied to the leading blade or trailing blade. , it does not adversely affect the running of the blade.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the main parts showing one embodiment of the present invention,
2 is a parts diagram, FIG. 3 is a partially omitted explanatory diagram of main parts showing the operation mode of the same embodiment, and FIGS. 4 and 5 are partial explanatory diagrams showing other embodiments, and a left side view thereof,
FIG. 6 shows a conventional example. 2... Leading blade, 3... Trailing blade, 4... Leading blade arm A, 5, 8, 16, 13... Pin, 7... Leading blade arm B, 7a... Protrusion, 9... Axis B, 1
1, 19... Drive spring, 12... Rear blade arm A, 15... Rear blade arm B, 15a... Protrusion,
17... Axis D, 20... Leaf spring, 21... Coil spring, 02-020... Corresponding conventional row parts shown with 0 added at the beginning.

Claims (1)

[Claims for Utility Model Registration] A leading blade 2 that is movable between an exposure aperture and a retracted position, and a leading blade 2 that is rotatably supported and that is rotatably supported by a pin 5 on one end side. The attached leading blade arm A4; the leading blade drive arm 10 having a pin 10a for engaging with and driving the hole 4a of the leading blade arm A; and the leading blade driving arm 10 for guiding the opening and closing of the leading blade 2. For this purpose, the leading blade 2 is rotatably attached to one end with a pin 8, and the other end is pivotally connected to a shaft B9, and has a protrusion 7a near this other end to follow the leading blade arm A4. A leading blade arm B7, a rear blade 3 that is movable between the exposure aperture and the retracted position, and a pin 13 that is rotatably supported and has a pin 13 on one end side.
a rear blade arm A12 to which the rear blade 3 is rotatably attached; a rear blade drive arm 18 equipped with a pin 18a for engaging with and driving the hole 12a of the rear blade arm A; In order to guide the opening and closing of the rear blade 3, the rear blade 3 is rotatably attached to one end with a pin 16, the other end is pivotally connected to a shaft D17 close to the shaft B9, and a protrusion is provided near the other end. 15a, and is driven by the rear blade arm A12.
and an arm spring 20 disposed close to the shaft B9 and the shaft D17, and the tip end 20a of the arm spring 20 touches the protrusion 7a of the leading blade arm B7 before the leading blade 2 starts.
, and after the leading blade 2 starts, it comes into contact with the protrusion 15a of the trailing blade arm B15.
A rattling mechanism for a focal plane shutter, characterized in that the protrusions 7a, 15a are arranged at positions shifted from the tip 20a.