JPS636741Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a camera counter device that displays the number of frames that have been photographed.

As a conventional counter device, a counter feed gear is meshed with an intermittent feed shaft having an approximately V-shaped notch, and the intermittent feed shaft is linked to the winding operation.
When it rotates, the counter feed gear will move one pitch (1
The number of frames that have been photographed is displayed by rotating the counter feed gear by the number of teeth) and moving a scale plate provided coaxially with the counter feed gear.

In electric cameras, various switches such as the jump feed switch are turned on and off in conjunction with this counter device.
Turn off. However, the amount of movement per pitch of the scale plate or counter feed gear is extremely small, for example, about 7 degrees of rotation angle and about 0.4 mm of movement distance, so it is difficult to accurately control the ON/OFF timing of the switch. The drawback was that adjustment was troublesome.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, the object of the present invention is to provide a camera counter device that is capable of feeding a counter feed gear or the like by a plurality of pitches per revolution of an intermittent feed shaft at a desired position. It is.

In the present device, at least two teeth are formed on a disc, such as a scale plate, provided coaxially with the counter feed gear, and the part of the counter feed gear corresponding to the teeth is made into a toothless part, and the notch part of the intermittent feed shaft is formed. is extended so as to mesh with the teeth of the scale plate, and is characterized by separately forming at least one notch that meshes only with the teeth of the scale plate. Therefore, when the notch of the intermittent feed shaft meshes with the teeth of the scale plate, the scale plate and the counter feed gear move by at least two pitches per revolution of the intermittent feed shaft.

In this way, the scale plate and counter feed gear move more than usual at the desired position, so when a switch that needs to be switched between pieces is linked to the counter mechanism, it is difficult to turn it on and off.
It becomes easier to achieve timing accuracy. The position at which the scale plate or the like is rotated extra can be arbitrarily determined depending on the switch used. Further, the present invention is not limited to switches, but can also be used, for example, when a cam is provided on a scale plate and the cam is used to operate a desired mechanism.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1, when the motor provided in the camera rotates to wind the photographic film, the drive gear 1 rotates in the direction of the solid line, and when the motor rotates in reverse to rewind the photographic film, it rotates in the direction of the dotted line. In addition, in the case of a manual winding camera, it is only necessary to rotate it in the direction of the solid line in conjunction with the winding lever.

Rotation of drive gear 1 is transmitted to gear 3 via gear 2. This gear 3 is the counter return lever 4
It is rotatably mounted on the top. This counter return lever 4 is activated when the back cover is closed.
a is pushed in the arrow direction against the spring 5 and pivots counterclockwise about the shaft 6 of the gear 2.

An intermittent feed shaft 7 is provided on the gear 3 so as to protrude upward, and this intermittent feed shaft 7 has two approximately V-shaped notches 7a and 7b that are mutually aligned.
They are formed 180 degrees apart.

When the intermittent feed shaft 7 is moved by the closing operation of the back cover, its notch 7a meshes with the counter feed gear 8. Since this counter feed gear 8 is biased by a return spring 9, it is reversed by opening the back cover and releasing the engagement with the intermittent feed shaft 7 after photographing. Further, a sliding brush 10 of a switch, for example, a jump feed switch S1 to be described later, is attached to the lower surface of the counter feed gear 8, and moves together with the counter feed gear 8 to position the substrate 11 at a desired position.
contacts 12a and 12b provided at the

A scale plate 14 is attached to the shaft 13 of the counter feed gear 8.
are fitted, and the screw 15 is screwed onto it.
Therefore, the scale plate 14 rotates together with the counter feed gear 8, and displays the number of photographed frames based on the value that matches the index 16. This scale plate 14 is provided with two teeth 14a, 14b, and these teeth 14a, 14b mesh with notches 7a, 7b formed in the intermittent feed shaft 7. Note that a disc separate from the scale plate 14 may be provided and teeth may be formed on this disc.

As shown in FIG. 2, the notch 7 of the intermittent feed shaft 7
A has a long length and meshes with both the counter feed gear 8 and the scale plate 14. The other notch 7b is short in length and engages only with the scale plate 14.

As shown in FIG. 3, the counter feed gear 8 is
A positioning protrusion 8a and a toothless portion 8b are provided. This toothless portion 8b is provided at a position overlapping with the teeth 14a, 14b of the scale plate 14,
The notch 7a of the intermittent feed shaft 7 is the counter feed gear 8.
and the scale plate 14 at the same time.

When the back cover is opened, the counter return lever 4 pivots clockwise due to the stored force of the spring 5 to separate the intermittent feed shaft 7 from the counter feed gear 8. The counter feed gear 8 and the scale plate 14 are rotated counterclockwise by the accumulated force of the return spring 9. Then, the counter feed gear 8 stops at the position where the protruding portion 8a collides with the intermittent feed shaft 7. At this time, the scale "S" matches the index 16.

When a photographic film is loaded and the back cover is closed, the counter return lever 4 pivots counterclockwise and the intermittent feed shaft 7 approaches the counter feed gear 8 and the teeth of the scale plate 14 so as to mesh with them. When the motor rotates and winds up one frame of photo film, gear 3
and the intermittent feed shaft 7 rotates once. This intermittent feed shaft 7 has notches 7a and 7b that correspond to the teeth 14 of the scale plate 14.
a and 14b, the city scale plate 14 and counter feed gear 8 rotate in the direction of the solid line by two teeth for one revolution of the intermittent feed shaft 7.

When winding up the next piece, since the notch 7a of the intermittent feed shaft 7 meshes only with the teeth of the counter feed gear 8, the counter feed gear 7
And the scale plate 14 is moved by one tooth.

In this way, when winding up the second frame of the skip-feeding pieces, the counter feed gear 8 and the scale plate 14 rotate by an angle 2θ, and the next frame and subsequent pieces rotate by an angle θ, which is half of this. While the counter feed gear 8 rotates by this angle 2θ, the sliding brush 10 contacts the contacts 12a and 12b to turn on the idle feed switch S1. Therefore, it is possible to increase the amount of movement of the counter feed gear 8 and the scale plate 14 at the desired position, so the switch is ON/OFF.
Improves accuracy of OFF timing.

Note that if the intermittent feed shaft 7 is provided with, for example, three notches and the scale plate 14 is provided with three teeth, the counter feed gear 8 and the scale plate 14 will be rotated three times per rotation of the intermittent feed shaft 7. It can be moved by a tooth.

When the motor is reversed to rewind the photographic film, the counter feed gear 8 and scale plate 14 rotate in the direction shown by the dotted line.

FIG. 4 shows the motor control device. The frame advance switch S2 is turned OFF when the photographic film has been wound by one frame, and turned ON when the shutter is operated. This frame advance switch S2 is ON
During this period, the forward rotation relay circuit 17 is turned on and connects the forward rotation relay switch S3 to contact a.
When this forward rotation relay switch S3 is connected to contact a, the motor 18 rotates forward and winds the photographic film one frame at a time.

The jump feed switch S1 is connected in parallel with this frame feed switch S2.
It turns ON in the middle of winding the frame, and turns OFF in the middle of winding the first frame.

When the rewinding switch S4 is turned on, the reversing relay circuit 19 is turned on and the reversing relay switch S5 is turned on.
Switch from contact b to contact a. Note that 20 is a power source that drives each of these circuits.

As shown in the timing chart in Figure 5, when the shutter is released, the frame advance switch S
2 turns ON and the forward rotation relay switch S3 is connected to contact a.
The motor 18 rotates normally and winds the photographic film. When the second frame of the jump-feeding pieces is wound up, the frame-feeding switch S2 is turned OFF.

However, at the second blank feed frame, the counter feed gear 8 rotates by two teeth, and the blank feed switch S1 is turned on during this period. Therefore, the motor 18
rotates continuously, and then the third blank feed piece and
The first piece, which is a valid piece, is wound. During the winding of this first frame, the jump feed switch S1 is activated.
Since it is turned OFF, when the winding of the first frame is completed and the frame advance switch S2 is turned OFF, the forward rotation relay circuit 17 is turned OFF. As a result, the forward rotation relay switch S3 switches from contact a to contact b, and the motor 18 is electrically braked and suddenly stopped.

After the first frame, the motor 18 rotates forward every time the shutter is released and winds the photographic film one frame at a time. If you turn on the rewind switch S4,
Since the reversing relay switch S5 switches from contact b to contact a, a reversing circuit for the motor 18 is formed and the photographic film is rewound.

The present invention having the above configuration allows the counter feed gear etc. to rotate more than usual at a desired position, so when operating a switch etc. in conjunction with these gears, it is possible to time the operation. It becomes easier. Therefore, the installation and adjustment of these switches and the like is simplified, and the accuracy of the timing of their operation is improved.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing an embodiment of the invention, Fig. 2 is a sectional view of an embodiment of the invention, Fig. 3 is a plan view of the main parts, and Fig. 4 is a motor control device using the invention. The circuit diagram and FIG. 5 are timing charts during winding. 4... Counter return lever, 7... Intermittent feed shaft, 7a, 7b... Notch, 8... Counter feed gear, 8b... Missing tooth portion, 10... Sliding brush, 1
2a, 12b...Contact, 14...Scale plate, 14
a, 14b...teeth, 16...indicator, 18...motor, S1...switch for blank feed, S2...switch for frame feed, S3...relay switch for forward rotation, S
4...Switch for reverse rotation, S5...Relay switch for reverse rotation.

Claims (1)

[Claims for Utility Model Registration] (1) One of the intermittent feed shafts having a substantially V-shaped notch
In a camera counter device in which a counter feed gear is rotated by one pitch with respect to the rotation, and a scale plate displaying the number of frames to be shot is moved in conjunction with the counter feed gear, the counter feed gear is coaxial with the counter feed gear. A plurality of teeth are formed on discs arranged at different positions, and the portion of the counter feed gear corresponding to the teeth of this disc is a toothless part, and the notch of the intermittent feed shaft is also formed as a tooth of the disc. at least one extending to mesh with and, separately, meshing only with the teeth of the disc;
Two notches are provided on the intermittent feed shaft, and at the position where the notch on the intermittent feed shaft meshes with the teeth of the disk, only the pitch corresponding to the number of notches on the intermittent feed shaft is provided for one rotation of the intermittent feed shaft. A counter device for a camera, characterized in that a counter feed gear and a disc are rotated, and the operation of a camera mechanism is controlled between them. (2) The camera counter device according to claim 1, wherein the disc is a scale plate provided coaxially with a counter feed gear. (3) The camera counter device according to claim 1 or 2, wherein the camera mechanism is a switch that controls the rotation of a film feeding motor.