JPS58142324A - Camera capable of changing size of image plane - Google Patents

Abstract

PURPOSE:To make a number of kinds of films usable in a camera of film pack exchange type, by building a film winding mechanism in a film back. CONSTITUTION:Vertical gear trains from a gear 3 integral with a winding lever 1 to a gear 10 are for a film pack which winds up a Brownie film. To use a 35-mm. film, a film pack 12 built therein with a winding mechanism is mounted to a film pack 12, then the gear 10 meshes with a gear 13 and the winding mechanism on the film pack side thereof operates to move the 35-mm. film to a prescribed extent. Since the rate of feed can be changed by changing a gear ratio with a change lever 29, it is possible to change the size of an image plane by changing masks.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera that is capable of using both types of film, Brownie and 35 mm versions of film.

Brownie version (6X9, 6X7.6X6. or 5X
4.5) A camera that uses Brownie film for shooting has a removable film back for loading roll film on the back of the camera body, and a film winding section inside the camera body. It is known that the camera is removable and the winding section loaded with roll film is inserted into the camera body, but in either case, the film used is limited to the Prony version.

This type of large camera has a removable screen frame, or by adding screen frames of different screen sizes.
You can take photos with different screen sizes. However, due to restrictions on the winding mechanism, the film used is limited to vertically fed roll film, so if you use a popular 35mm version of film with a cartridge in this camera, even if a cartridge is loaded, the film will not work properly. The camera moves vertically, so if you try to take a 24x36 Leica version, the screen will always be vertical, and when you hold the camera normally, the screen will be horizontal. However, it is actually very difficult to load a 35 mm film into this type of large-sized camera and make it possible to photograph a horizontally positioned screen.

Note that studio cameras that use dry plates do not have a film winding mechanism in the camera body, so it is possible to use roll film by attaching a film back to the part where the dry plate is attached. is known, and if you attach a prony film back and a 35mm film back interchangeably, you can shoot with either type of film.
In this case, the entire winding mechanism must be built into the film back, which poses a problem in that the film back becomes very expensive.

In view of these circumstances, it is an object of the present invention to provide a camera that can be used with both Brownie film and 35 mm film.

More specifically, the present invention provides a large camera that uses Brawny version film with a mechanism for using 35mm film, thereby providing a camera that can optionally use both types of film. This is the purpose.

A further object of the present invention is to provide a device that adds a function to a conventional large-format camera that uses Brawny film to enable the use of 35 mm film.

The camera of the present invention is a large-sized camera that uses Pronie film, and has a film winding section that can be freely switched to a 35 mm film winding section, and is operated by a winding lever provided on the camera body. A film winding drive unit is disposed within the camera body, and a film winding mechanism that interlocks with the film winding drive unit is built into each of the prony film winding unit and the 35 mm film winding unit, The camera body is characterized in that a common part for winding both types of film is built in, and a winding mechanism unique to both types of film is built in each film winding section.

That is, the camera of the present invention operates a film winding drive section through a group of gears using a winding crank lever provided on the camera body side, and has a film winding mechanism that operates in conjunction with this winding drive section. The present invention is characterized in that a section is provided for each of the prony version film and the 35 mm version film, and each film winding section is provided so as to be freely switchable to the camera. For example, in the case of a film back type camera, the film winding section can be switched freely by using the film back as the film winding section.
In addition to the conventional Bronie film back, a film back for 35 mm film is prepared, and the film winding drive section on the camera body side is linked to the film winding mechanism inside the film back. Some film backs for millimeter film are designed to feed the film horizontally.
A mechanism can be provided that changes vertical rotation from the winding drive section on the camera body side into horizontal rotation. In addition, for cameras that are not film back type and have a prony version film winding mechanism built into the camera body, it is possible to load a 35mm version film winding part into the film loading part of this camera. A winding mechanism may be provided in the winding section to generate horizontal feed rotation in conjunction with a part of the winding mechanism for the Brownie suit.

According to the camera of the present invention, the Brownie version film and the 35
Both millimeter film types can be selectively used in one camera, and since the common film winding drive unit is built into the camera body, the film winding unit that can be switched for each type of film is inexpensive. This is a practical advantage.

In particular, film back format cameras are extremely convenient in practice, as all conventional large-format Brownie cameras can be used as is, and you can shoot on 35 mm film simply by preparing a 35 mm film back. be.

Note that when using 35mm film, the size of the camera can be increased to the same size as the Brownie contract, so it is possible to shoot with a horizontal screen size that is longer than the standard screen size in the length direction of the film. On the other hand, it is also possible to photograph a screen that is shorter than the standard screen size, such as a square screen or a vertically long screen.

Therefore, when using 35mm film, 3
Provide screen frames for two or more screen sizes that can be freely switched: 5mm standard screen size (24H x 36s■), horizontal screen size (for example, 24ux 54m5), square screen size (24ma + x 24sIl), or vertical screen size (24ux 18sm). This makes it possible to take images of two or more sizes. In this case, the film feed amount must be changed for each screen size, so a film feed amount switching mechanism is required, but the embodiment of the present invention described below is also provided with a switching mechanism for this purpose. ing.

Of course, when using 35mm film, the screen size is the standard screen size, and as in the example shown below. It goes without saying that it is also possible to implement methods that are not switchable to species.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a perspective view of one embodiment of the invention. This embodiment is an example in which the present invention is applied to a camera that does not use a film back. Vertical gear groups 3 to 9 are engaged with the hoisting shaft 2, and a gear 10 is fixed coaxially with the gear 9. The winding lever shaft 2 and the vertical gear groups 3 to 9 are rotatably supported by the camera body 11. This structure corresponds to a camera using a conventional film back, in which the winding mechanism on the film back side is incorporated into the camera, so its details will be omitted. Roughly, at the rear of the camera body 11, a film winding section 12 for a 35 mm version is removably attached. First, the camera body 11
A gear 14 that is fixed coaxially with the gear 13 that is engaged with the gear 10 of the side terminal is engaged with the gear 15, and a bevel gear 16 that is fixed coaxially with the gear 15 is engaged with the bevel gear 1.
7 to convert the direction of the rotation axis to the horizontal direction.

A gear 18 is coaxially fixed to the bevel gear 17,
Engaged with the gear 18 are a film feed gear 19 for the horizontal screen size of 35 mm film and a film feed gear 20 for standard size of 35 mm film. It is configured to set the amount of feed per time. Further, the gear 17.18.19.20 is the gear 17.18.
It is mounted on a rotation support plate 21 that is rotatably supported by the same rotation shaft (see FIG. 2). Said gear 1
Either one of the planetary gears 9 and 20 is engaged with one of the planetary gears 22 and 23, respectively, by rotation of the rotary support plate 21. The planetary gears 22 and 23 are coaxially supported independently and rotatably, and are engaged with separate coaxially fixed gears 24 and 25, respectively. Furthermore, a gear 26, which is fixed coaxially with the gears 24, 25, is engaged with a take-up spool gear 27. The rotation support plate 2
1 is formed with a fork-shaped protrusion 28, into which a bottle 31 implanted in the arm 30 of the switching lever 29 is fitted. The switching lever 29 is rotatably supported by a shaft 32.

FIG. 3 shows another embodiment of the present invention, in which gear groups 3 to 5 are disposed inside the camera body, and the film winding mechanism from gear 6 to gear 26 is connected to a film back 33 which is a film winding section.
This film back 33 is stored inside the camera body 11.
In addition, a film winding frame 34 having a film winding spool 27a is removably mounted inside the film bag 33.

Although the frame number counter rotation mechanism and indexing mechanism related to the film winding mechanism are shown in the figure, they are described in detail in Japanese Patent Application Laid-Open No. 52-2726, filed by the same applicant, and will therefore be omitted.

Next, the operation of the two embodiments of the present invention configured as described above will be explained.

When using a 35 mm film, the film winding section 12 (film back 33 in the second embodiment) for the 35 mm film is attached to the camera.

When winding a film, the winding lever 1 is rotated clockwise and the terminal gear 10 (
In the second embodiment, 5) is rotated.

The terminal gear 10 (5) is the film removal part 12 for the 35 mm version.
(33 in the second embodiment) side gear 13 (6 in the second embodiment), and further engages with the gear 13 (6 in the second embodiment) through the gear group 14.15 (not present in the second embodiment) and the bevel gear 16.17. Rotate 18. Gear 18 engages both gears 19 and 20 simultaneously. When the switching lever 29 is rotated clockwise,
The gear 20 mounted on the rotation support plate 21 is the gear 23
, and a preset number of teeth transmits to the gear 23 rotation corresponding to the feed amount for one frame of standard screen size of 35 mm film. Similarly, when the switching lever 29 is rotated counterclockwise, the gear 19 mounted on the rotary support plate 21 engages with the gear 22, and the preset number of teeth causes the switch lever 29 to be rotated counterclockwise. Rotation corresponding to the feed amount for one frame is transmitted to the gear 22.

Furthermore, gear 23 rotates gear 25, gear 22 rotates gear 24, and in both cases rotates gear 26, which is coaxially fixed. The gear 26 rotates the spool tooth width 27 to wind up the film.

In each of the above embodiments, the screen size can be switched when using a 35 mm film, but this may be done in a format where only the standard screen size is used, as described above. In this case, the switching lever 29 is not required, and only one type of gear train is required, resulting in a simple structure.

As is clear from the above detailed explanation, according to the present invention, the film winding unit for the Brownie version and the 35 mm version can be switched freely, and the winding drive unit common to both winding units is on the camera body side. Since only the winding mechanism that is linked to the film winding drive section is built into the winding section, the structure of each winding section is simplified, making it possible to provide an inexpensive camera that can change the screen size. can.

[Brief explanation of the drawing]

1 is a partially cutaway perspective view showing the details of the mechanism of the main part of an embodiment of the camera according to the present invention, FIG. 2 is a detailed explanatory view of the mechanism of the main part of the winding section for 35 mm film, and The figure is a partially cutaway perspective view showing a 35 mm film winding section in another embodiment of the camera of the present invention. 1...Hoisting lever 2...Hoisting lever shaft 3-10...Gear 11...
・Camera body 12...35mm version film winding section 13-15...Gears 16.17...
Umbrella gear wheels 18-20... Own car 21...
... Rotating support plates 22, 23 ... Planetary gear
24-26...Gear 27...Take-up spool gear 28...Protrusion portion 29...
...Switching lever 30...Arm 3
１・・・・・・・・・Bin 32・・・・・・
・Shaft 33...Film back 34...Film take-up frame 120

Claims (1)

[Claims] In large cameras that use Prony version film, the film winding section can be freely switched to the 35 mm version film winding section, and a winding lever is provided on the camera body, and the film winding is operated by this winding lever. A drive unit is disposed within the camera body, and a film winding mechanism is provided in each of the film winding unit of the prony version and the film winding unit of the 35 mm version, which is interlocked with the film winding drive unit on the camera body side. A camera with a built-in screen that allows you to change the screen size.