JPS6232282Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a film counter device for a camera. The conventionally known digital counter is the first
As shown in the figure, the engagement between the idler 5' and the letter wheel 1' is released by pressing the reset lever 6', and the letter wheel is returned to its original position (reset) using the cam provided on the letter wheel. This is a form of conducting. When using such a counter as a camera's film counter and associating the counter's reset and counting with the camera's shooting preparation or completion operations, such as the opening/closing of the camera back cover, film ejection, and loading operations, the following procedure can be used. There are some inconveniences.

The camera function requires that the counter be reset in conjunction with shooting completion operations such as opening the back cover and taking out the film, and that it be possible to count in conjunction with shooting preparation operations such as closing the back cover and loading film. On the other hand, the conventional counter resets the counter when the reset lever is pressed.
When the pressure is released, the idler and letter ring engage and can be counted, so when the camera back is closed or the film is loaded, the pressure from the back cover or cartridge can be used as shown by the chain line in the figure. A reversing means is required to release the pressure on the reset lever and release the pressure on the camera back or cartridge when the camera back cover is opened or the film is taken out. The biasing spring a used in such a reversing means and the spring b biasing the idler in the direction of the letter ring are so-called "fighting springs", so they are automatically activated in conjunction with shooting completion operations such as opening the camera back. The reset force (pressing force of the reset lever) when resetting the counter becomes weaker, which leads to a decrease in the reliability of the counter reset.

The present invention solves the above-mentioned drawbacks by applying a reset biasing force to the reset member in a direction that nullifies or reduces the biasing force of the biasing means for pressing the transmission means such as an idler against the letter wheel. This will be explained below based on the drawings.

FIG. 2 shows an embodiment of a camera film counter employing the present invention. 1 in the figure is the letter ring,
The first digit ring 110 is fractionated into 10 fractions and numbers from "0" to "9" are sequentially displayed on each fraction; It consists of a 10th digit ring 111 on which the required number is displayed (the maximum number of film for 35mm cameras in general use is 36, so for a normal camera, up to the number "3" is sufficient). 2 is a pulley whose rotation axis is shaft SH-1, and a worm gear 3 is attached to the other end of the shaft SH-1.
has been established. The rotation angle of the pulley 2 is transmitted from the worm gear 3 to the idler 5 of the idler shaft SH-2 via a known transmission means including a worm wheel 4, and further to the idler 5 of the idler shaft SH-2.
can be conveyed to. The 10th digit ring 111 is the 1st digit ring 11
When 0 rotates and the number on the first digit wheel 110 changes from "9" to "0", it is rotated by one fraction. 6
is a reset lever, and a spring 7 for biasing the reset lever 6 is provided at the upper end, and a spring 8 for biasing the idler 5 is connected between the reset lever 6 and the idler shaft.
This is provided in relation to SH-2. Reference numeral 9 denotes a reset pressing lever, which is constructed integrally with the reset lever 6. When the camera back cover is opened, the reset pressing lever 9 rotates integrally with the reset lever 6 and engages with the heart-shaped cam 112 of the character ring 1. to return the character ring to its original position.

Next, we will discuss the relationship between opening and closing the camera back cover, reset lever, idler, spring, etc.

Open the camera back cover and close it from the chain line position where you have finished resetting the character ring, and the reset lever 6
rotates clockwise about the shaft SH-3, and accordingly, the reset pressing lever 9 rotates clockwise and disengages from the heart-shaped cam 112 of the letter wheel, and the spring 7 is biased. Ru. Also, idler shaft SH
-2 causes the idler 5 to engage with the character wheel 1 by following the clockwise rotation of the reset lever by the spring 8. In this embodiment, the spring 8 also serves to absorb excessive impact (force) when the idler 5 and the letter wheel 1 engage. After the idler 5 engages with the character wheel 1, when the reset lever 6 continues to rotate and then stops, the spring 8 is biased by an amount corresponding to the rotation, and the idler 5 is pressed against the character wheel 1 to count. It becomes possible. When the back cover of the camera is opened after shooting a predetermined number of films, the unlocked reset lever 6 is rotated counterclockwise by the springs 7 and 8 that are biased in advance, and the spring 8 is rotated counterclockwise. After the biasing force disappears, the reset lever 6, which is rotated by the biasing force of the spring 7, presses the idler shaft SH-2 to the chain line position, and at this time, the reset pressing lever 9 rotates counterclockwise, and the heart-shaped cam is rotated. 112 to reset the character wheel 1.

As described above, when the present invention is used, all of the biasing force of the reset member biasing means can be used to reset the character ring, resulting in an excellent effect of improving the reliability of the counter.

[Brief explanation of the drawing]

FIG. 1 shows a conventional counter device. FIG. 2 shows a camera film counter device according to the present invention. 1,1'...Character ring, 110...First digit ring, 1
11...Second digit ring, 112...Heart-shaped cam, 2
...Pulley, 3...Worm gear, 4...Worm wheel, 5,5'...Idler, 6,
6'...Reset lever, 7...Spring, 8...Spring, 9...Reset pressure lever, a, b...Spring.

Claims (1)

[Scope of utility model registration request] A character wheel for displaying a count number, a transmission means for transmitting driving force from a drive unit to the character wheel, an urging means for pressing the transmission means against the character wheel, and a cam acting on the character wheel. and a movable reset member which is biased in a direction to release the pressure contact of the transmission means against the character wheel and causes the character wheel to return to its original position, and is linked to the camera's photographing preparation or completion operation, In the camera film counter device configured to reset and count the character wheel, biasing means for pressing the transmission means against the character wheel is provided in the movable part of the reset member, and the origin of the character wheel is provided. A film counter device for a camera, characterized in that the biasing force of the biasing means is reduced by the movement of the reset member when returning to the position.