JPH07152073A - Automatic film winding type camera - Google Patents

Abstract

PURPOSE:To provide an automatic film winding type camera capable of always placing the film inserting groove of a spool in a position suitable for the insert of a part of a film reader at the time of loading the film. CONSTITUTION:The automatic film winding type camera by the drive of a motor using a roll film F is provided with an angle position detecting means 5 detecting the position of an angle in the rotational direction of a spool bearing 4a and a winding completion detecting means 16 detecting the completion of the winding of the roll film F and constituted so that the drive of the motor is stopped during winding, when the completion of the winding of the roll film F is detected with a signal frown the winding completion detecting means 16 and then, the fact that the spool bearing 4a is in a fixed angle position, is detected with the signal from the angle position detecting means 5. The angle position is properly set to place the film inserting groove 14 of the spool 1 in the position suitable for the insert of the film leader part FL.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic film winding type camera using a roll film such as a so-called Brownie film.

[0002]

2. Description of the Related Art In recent years, a camera using a roll film has been developed which adopts an automatic winding system by the power of a motor as a film winding system. In such an automatic film winding type camera, a film winding lever or a film winding knob is generally omitted.

[0003]

By the way, when the roll film is loaded into the camera, after inserting the leader portion of the film into the film insertion groove of the spool on the take-up side, the spool is gradually pushed while pressing the back surface of the film. Rotate and wind the film around the spool. In this film loading operation, if the leader portion of the film is not properly inserted into the film insertion groove of the spool, problems such as overweight and unwinding may occur.

For this reason, in the conventional general manual winding type camera, the film winding lever or knob is used so that the leader portion of the film can be easily inserted, and generally, the film insertion groove can be easily seen by the user. Until I was supposed to rotate the spool.

However, the conventional automatic winding type camera has no film winding lever and is not provided with a mechanism for minutely rotating the spool. Therefore, in the case where the film insertion groove of the spool faces sideways. , It was necessary to turn the spool by hand and arrange the film insertion groove at an appropriate position. In this case, the spool may be rotated in the direction opposite to the film winding direction, but such reverse rotation is not mechanically preferable and causes a failure. Moreover, the fact that such work is necessary is very troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic film winding type camera in which the film insertion groove of the spool is always in a position suitable for insertion of the film leader portion when the film is loaded.

[0007]

In order to achieve the above object, the present invention relates to a film automatic winding type camera using a roll film, which comprises a pair of spool receiving shafts to which spools for winding the roll film are attached. A motor for rotationally driving one of them, an angular position detecting means for detecting an angular position of one of these spool receiving shafts in a rotational direction, a winding completion detecting means for detecting completion of winding of the roll film, During winding, after detecting the completion of winding of the roll film by the signal from the winding completion detecting means, it was detected by the signal from the angular position detecting means that the spool receiving shaft reached a predetermined angular position. And a control means adapted to stop the driving of the motor.

[0008]

According to the present invention, when the motor is stopped after the winding of the roll film is completed, the spool bearing shaft is stopped at a certain angular position. The spool on which is wound) also stops with its film insertion groove facing in a certain direction. Therefore, by appropriately selecting the angular position, the spool receiving shaft can be stopped when the film insertion groove of the spool reaches a position suitable for inserting the film leader portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an automatic winding type camera for roll film to which the present invention is applied. As shown in the drawing, the spool 1 for winding the roll film F is supported by a pair of spool receiving shafts 4a and 4b arranged vertically inside the film chamber 3 on the winding side of the camera body 2. There is. Although not shown, the rotation shaft of the motor is connected to the lower spool bearing shaft 4b via a gear transmission mechanism. Further, the upper spool bearing shaft 4a is provided with an angular position detector 5 for detecting an angular position in the rotation direction thereof.

Although various types of angle position detectors 5 can be considered, the angle position detector 5 in the illustrated embodiment is
A disk 6 coaxially attached to the spool receiving shaft 4a, a pair of pins 7 projectingly provided on the upper surface of the disk 6, and a pin attached to the camera body 2 are brought into contact with the lever 8 to close the disk. The limit switch 9 is turned on (ON). The pins 7 are arranged point-symmetrically around the rotation axis of the disc 6. In addition, pin 7 is the limit switch 9
Pin 7 so that the pair of protrusions 10 provided on the outer peripheral surface of the spool receiving shaft 4a face the front-rear direction of the camera body 2 (the optical axis direction of the lens 11) when the lever 7 is contacted.
Is positioned.

At both ends of the spool 1, spool receiving shafts 4a,
A hole 12 is formed to receive 4b. A pair of grooves 13 extending outward in the radial direction are formed on the inner peripheral surface of the hole 12, and the spool receiving shaft 4a,
The protruding piece 10 of 4b is inserted. Since the direction of the line connecting the paired grooves 13 and the penetrating direction of the film insertion groove 14 are the same, the spool receiving shafts 4a, 4b
When this spool 1 is attached to the
The projection pieces 10 of a and 4b and the film insertion groove 14 of the spool 1 face in the same direction. Therefore, at the angular position of the spool receiving shafts 4a and 4b where the limit switch 9 is turned on, the protruding piece 10 faces the front-back direction of the camera body 2, so that the film insertion groove 1 of the spool 1
4 also turns in the front-back direction. In this state, since the film insertion groove 14 is in a position visible to the user, the leader portion FL of the roll film F can be easily inserted therein.

Further, the camera body 2 is provided with a guide roller 15 for stably feeding the roll film F, and a rotation detector 16 is connected to a rotation shaft of the guide roller 15. . The rotation detector 16 is for detecting the rotation state of the guide roller 15, and it is also possible to detect the completion of winding the roll film F from the output signal thereof.

In such a camera, the control means for controlling the film winding motor is mainly composed of a CPU (so-called one-chip microcomputer) 17, as shown in FIG. The CPU 18 includes the limit switch 9 and the rotation detector 16 of the angular position detector 5 described above.
Are connected, and these output signals are input. A drive circuit 19 for the motor 18 is connected to the CPU 17, and the drive of the motor 18 is controlled according to a control signal output from the CPU 17.

Next, the operation of the camera having the above structure will be described with respect to the portion related to the present invention.

First, when a predetermined number of roll films F have been photographed and the film is wound, the CPU 1
The motor 18 is continuously driven by the control signal from 7.
As a result, the roll film F having been photographed is taken up by the spool 1 in the take-up side film chamber 3.

When the winding of the film F is completed, the rotation of the guide roller 15 is stopped. The CPU 17 recognizes that the guide roller 15 has stopped based on a signal from the rotation detector 16, and then confirms that the guide roller 15 has stopped for a certain period of time, thereby determining that the winding is completed.

During this time, the motor is still driving, and the spool 1 continues to rotate together with the film F which has been photographed.
When 17 receives the ON signal from the limit switch 9 of the angle position detector 5 after detecting the film winding completion,
A stop signal is issued to the motor drive circuit 19 to stop the motor 18. At this time, as described above, the spool receiving shaft 4
The projection pieces 10 of a and 4b are in the same direction as the front-back direction of the camera body 2, and therefore the film insertion groove 14 of the spool 1 around which the film F having been photographed is wound is also oriented in the front-back direction.

After the motor 18 is stopped, the camera user opens the back cover 20, takes out the film F already taken from the film chamber 3, and mounts a new empty spool 1 on the spool receiving shafts 4a and 4b. However, at this time, if this work is performed without rotating the spool receiving shafts 4a and 4b, the film insertion groove 14 of the new spool 1 is mounted in a state of facing the front-back direction of the camera body 2. Therefore, the leader portion FL of the unphotographed roll film F can be easily and properly inserted into the film insertion groove 14 of the new spool 1.

In the above embodiment, the spool receiving shafts 4a,
The angular position of 4b at the time of stop is set so that the direction of the projection piece 10 is the front-back direction.
The angular position of b when stopped can be appropriately changed according to the shape of the camera and the like.

[0021]

As described above, according to the present invention, the spool receiving shaft is stopped at a certain angular position when the film is loaded, and the film insertion groove of the spool attached thereto is at a position suitable for inserting the film. Becomes Therefore, the camera user does not need to rotate the spool to adjust the position when loading the film, and can immediately start the film loading operation. Particularly, in an automatic winding type camera without a film winding lever, it is possible to prevent an unreasonable force from acting on the spool receiving shaft, so that mechanical trouble is prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an automatic film winding camera to which the present invention is applied.

FIG. 2 is a block diagram showing a CPU, which is a control means of a film winding motor of a camera according to the present invention, and a connecting element thereof.

[Explanation of symbols] 1 ... spool for film winding, 2 ... camera body, 3
... film chamber, 4a, 4b ... spool receiving shaft, 5 ... angular position detector, 9 ... limit switch, 14 ... film insertion groove, 15 ... guide roller, 16 ... rotation detector (winding completion detecting means), 17 ... CPU, 18 ... Motor, 19 ...
Motor drive circuit, 20 ... case back.

Claims (2)

[Claims] 1. An automatic film winding camera using a roll film, wherein a spool for winding the roll film is attached.
A motor that rotationally drives one of the pair of spool bearing shafts, an angular position detection unit that detects the angular position of one of the spool bearing shafts in the rotational direction, and a winding unit that detects the completion of winding the roll film. Completion detecting means, and during winding, after detecting that the winding of the roll film is completed by the signal from the winding completion detecting means,
Control means for stopping the driving of the motor when it is detected that the spool receiving shaft has reached a predetermined angular position by a signal from the angular position detecting means,
Automatic film winding type camera equipped with. 2. The film according to claim 1, wherein the angular position is a position in which a film insertion groove of the spool is in a position suitable for inserting a film when a spool is attached to the spool receiving shaft. Self-winding camera.