JPS6070427A - Slit adjusting mechanism in rotary shutter - Google Patents

Abstract

PURPOSE:To make a slit adjusting mechanism compact, and to adjust a slit with a high accuracy by turning a planet gear by an external operation and making it interlock with one of rotary plates, so that a width of the slit can be adjusted. CONSTITUTION:When an arm 8 whose one end is fitted loosely to a revolving shaft 7 of a platen gear 5, namely, the center shaft of a composite gear 2 is made operable manually or automatically through a simple transfer mechanism from the outside, and the arm is turned round the center axis of the composite gear 2, the second planet gear 5 revolves and moves, turning centering around a sun gear 4a, and an internal gear 6 engaged to the second planet gear 5, and the second rotary plate 10 are rotated by a prescribed quantity, by which a slit position of the second rotary plate 10 against a slit of the first rotary plate 9 is varied relatively, and the slit width is varied. In this way, a slit adjusting mechanism can be contained compactly, and a speed of a shutter bead can be adjusted exactly by an angle operation of a high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a slit adjustment mechanism in a rotary shutter.

Conventionally, by appropriately shifting the positions of slits formed in two coaxially supported rotary plates, the width of the slits is relatively changed, and the exposure window of the camera is changed by the slit width of the rotary plates. A slit adjustment mechanism for adjusting the time required for crossing, that is, the shutter speed, is disclosed in Japanese Utility Model Publication No. 41-2608.

Various proposals have been made as shown in Japanese Utility Model Publication No. 4'1-29806.

However, in the conventional slit adjustment mechanism, the slit position is adjusted as described above through a complicated differential gear mechanism, pulley, bell, etc.

The mechanism itself becomes sloppy, and there are inconveniences such as the space being crowded, and it is difficult to precisely produce the phase shift between the two rotary plates, so it is unlikely to be practical. Only -1.

The present invention has been made in view of the above points.
It is an object of the present invention to provide a slit adjustment ff6 mechanism that is organized around the center 1111 of the rotary shutter mechanism into a slit 1-adjustment mechanism or a combination 1-adjustment mechanism and that can also accurately adjust 11 slits.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a side sectional view showing a slit adjustment mechanism according to the present invention, in which an annular rising portion is formed on one edge of the composite gear 2, and a continuous inner and outer circumference of the rising portion is formed. On the other side of the composite gear 2, a circular first rotary plate 9 having a fan-shaped slit formed on the plate surface is attached with the same rotation center as the composite gear 2. . In addition, a shutter operating gear 1 for transmitting the rotation of a shutter drive motor (not shown) meshes with the teeth formed on the outer periphery of the rising portion of the compound gear 2, and the teeth formed on the inner periphery of the rising portion A first planetary gear 3 that fixes the support shaft to the camera body meshes with the tooth profile. Further, the first planetary tooth medium 3 also meshes with a sun gear 4 fixed to the central axis of the compound gear 2, and
A sun gear 4a, which is the same as the sun gear 4, is fixed to the other end of the central axis. Furthermore, the sun gear 4a includes the first
The same second planetary gear 5 is meshed with the planetary gear 3 of
The rotation shaft 7 of the second planetary gear 5 is pivotally supported by the other end of an arm 8 whose one end is loosely fitted to the central axis of the composite gear 2, and the second planetary gear 5 is also It meshes with the tooth profile on the inner periphery of the gear 6, which is coaxial and the same shape as the composite gear 2, and has tooth profiles continuously formed only on the inner periphery of the standing bird part.

In addition, on the other side of the internal gear 6, there is a second rotary plate 1o with a mounting number Pl')9 installed opposite to the first rotary plate 9. Similarly to the first rotating plate 9, a fan-shaped ring I- is formed on the surface of the rotating plate 10 (7).

Therefore, the rotation of the shutter operating gear 1 operated by the shutter drive motor (not shown) is transmitted to the composite gear 2, and rotates the first rotary plate 9, which is engaged by the composite gear 2. At the same time, the rotation causes the first MyJ
, gear 3. Sun gear 4 and 4,1° second planetary gear 5.
Transmitted to the internal gear 6, the second rotary plate 10, which is set one inch apart from the internal gear 6, is also rotated. In such a case, the inner periphery of the composite gear 2, the inner periphery of the internal gear 6, the first planetary gear 3 and the second planetary gear 5, and the sun gears 4 and 48 have the same gear V diameter and the same number of teeth. Therefore, the first rotary plate 9 and the second rotary plate lO rotate at the same speed, and the slit formed in the plate surface of the first rotary plate 9 and the slit formed in the second rotary plate 10 A slit is a slit that always maintains a constant positional relationship and is formed by the relative relationship between the slit of the first rotating plate 9 and the slit of the second rotating plate IO. It functions as a rotary shutter by crossing the

Here, an arm 8 having one end 1lffl connected to the rotating shaft 7 of the planetary gear 5, that is, the central axis of the compound gear 2, can be operated manually or automatically from the outside via a simple transmission mechanism. From the state shown in FIG. 2 to the state 1F3 shown in FIG. 3, when the composite gear 2 is rotated around the central axis, the second jIi star gear 5 rotates around the sun gear 4a. The internal gear 6 and the second rotating plate 10, which are in mesh with the second planetary gear 5, are rotated by a certain amount, and as a result, as is clear from FIGS. The second rotary plate l for the slit of the rotary plate 9
The slit 1 position of O changes, and the slit 1 width can be changed by a relative change between the slit 1 position of the first rotary plate 9 and the slit position of the second rotary plate 10. It becomes possible.

In addition, in the case of the above operation, the second planetary gear 5 is the sun gear 4
Since the sun gear '1.1 does not rotate because it rotates and moves around a, the first rotary plate 9
It is clear that in the above case, there is no rotation.

The present invention is constructed in accordance with one or more aspects of the present invention, and the lit adjustment device 4iX'k is located at the center of the rotary shutter.
Since it can be stored in a compact container around 1li111, it is fully usable even if it is installed inside the case for turtles with limited space, and the rotary plate can be directly connected to manual or automatic planetary gear rotation. Since the slit b' device is changed by rotating J: 4', the 11-stone angle of 17 degrees is J5, and the 1 is IIJ fi! j, and by doing so, it is possible to accurately adjust the speed to S(Sotersby-1).
The C1 slit adjustment mechanism can be operated on the camera side, so don't move the L/L lance aperture (although this is a matter of exposure sensitivity!
f) It has excellent effects such as hair loss.

[Brief explanation of the drawing]

FIG. 1 shows side 1 of the slit I-tone fiij mechanism according to the present invention.
No. 1 "Surin 1-Adjuster (1-
The state before and after the operation is shown below:
This is a map of the residence and area of Han.

Claims (1)

[Claims] In a rotary shutter mechanism in which the slit width is made variable by relatively changing the positions of the slits 21 formed on two rotary plates, a sun gear is fixed to the central axis of the rotary shutter mechanism. , a planetary gear is meshed with the sun gear to form a planetary gear train. The rotation of the planetary gear can be controlled externally. A sling adjustment mechanism for a rotary shutter, characterized in that the slit width can be adjusted by interlocking the rotation of the planetary gear with either one of the rotary plates.