JPH06138541A - Initial feeding mechanism for camera - Google Patents

Abstract

PURPOSE:To provide a film initial feeding mechanism for a camera capable of obtaining accurate and stable film initial feeding by constituting the camera so that it can surely detect the rotation of the shaft member of a film cartridge in the camera using a feeding type cartridge. CONSTITUTION:The film cartridge is loaded, a film spool 11 is rotated by an R fork 3 through an R gear 4, so that the initial feeding of the film can be performed, then a connecting condition between the R fork 3 and the film spool 11 is detected by an R fork switch 10, and film initial feeding amount can be measured from the time when they are perfectly connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera initial feed mechanism, and more particularly to a film initial feed mechanism for a camera using a feed type cartridge.

[0002]

2. Description of the Related Art Conventionally, various proposals have been made regarding a camera or a patrone capable of surely performing film initial feeding of a camera using a feeding type patrone. Among them, JP-A-3-37646 has been proposed. The photographic film patrone disclosed in Japanese Patent Publication has a structure in which the film is pressed against the film spool from the inner wall surface side of the patrone, the film spool is rotated and the film is moved integrally, and the film is reliably fed out. Is. The film cartridge camera disclosed in Japanese Patent Laid-Open No. 2-113230 is a camera to which a patrone with a built-in sprocket is applied, and the amount of movement of the film can be reliably detected by the rotation of the built-in sprocket.

[0003]

However, in the one disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 3-37646, idling occurs when the film spool shaft on the cartridge side and the drive shaft on the camera side are connected. Since it is considered that the film is being fed even in the initial idling, an error has occurred in the actual film feeding amount. Further, even in the one disclosed in the above-mentioned Japanese Patent Laid-Open No. 2-113230, idling occurs due to the engagement between the patrone side sprocket and the camera side drive shaft, and similarly, an error occurs in the film feed amount.

The present invention has been made in order to solve the above-mentioned problems, and in a camera using a feeding type cartridge, the rotation of the shaft member of the film cartridge is surely detected, so that the rotation is accurate and stable. It is an object of the present invention to provide a film initial feed mechanism of a camera capable of performing the film initial feed described above.

[0005]

A film initial feeding mechanism for a camera according to the present invention is a film initial feeding mechanism for a camera using a feeding type patrone capable of feeding a film from an outlet of a film patrone by rotating a film shaft member. In the feeding mechanism, the rotation transmitting means for rotating the shaft member in association with the shaft member of the film cartridge to feed the film, the rotation driving means for driving the rotation transmitting means, the rotation transmitting means and the film A detection means for detecting whether or not the shaft member is connected; and a transmission rotation amount control means for controlling the rotation amount of the rotation transmission means based on the output detected by the detection means. To do.

[0006]

The detection means detects whether or not the rotation transmission means and the shaft member of the film are connected, and the transmission rotation amount control means controls the rotation amount of the rotation transmission means based on the detection output. Sets the initial feed amount of the film to a predetermined length.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a camera having a film initial feeding mechanism according to the first embodiment of the present invention. However, the film winding control unit, the exposure control unit, the autofocus control unit, the lens drive unit, etc. are omitted. The present camera controls each control element of the camera as shown in FIG. 1 and also has a control circuit (CP) which also includes a transmission rotation amount control means for controlling the rotation amount of the R fork gear 4 described later.
U) 19, and read the DX code of the film,
A DX code switch 16 that detects whether or not the film cartridge 12 is loaded, a back cover switch 15 that detects the open / closed state of the back cover, a drive motor 18 that winds and rewinds the film, and a film feeding mechanism unit 17 and the like. It is mainly composed of.

The film feeding mechanism section 17 is used.
Is a mechanism for performing initial film feeding, film winding at the time of shooting, and further rewinding. And the mechanical unit 1
Reference numeral 7 denotes a rotation drive means, which is a gear train 5a, 5b for transmitting the driving force of the drive motor 18 to the R fork 3.
Also, the R gear 4, the R fork 3 which is a rotation transmitting means for film feeding and can be connected to the film spool 11, the film spool 11 which is a shaft member of the film cartridge, and the R fork 3 are films. The spool 11 includes an R fork switch 10 that is turned on when it is connected to the spool 11, a photo interrupter 14 that detects the amount of rotation of the R gear 4, and the like.

2 to 4 are sectional views in the initial film feeding operation state of the film feeding mechanism portion 17, and FIG. 2 shows the film cartridge 12 not yet. Sectional view when loaded, FIG. 3 shows film cartridge 12
, But the film spool 11 and the R fork 3 of the cartridge have not yet been fitted between the forked portions 3a and 3b and the convex portion 11c, as will be described later, and are not in a connected state. Further, FIG. 4 is a sectional view when the film cartridge 12 is loaded and the R fork 3 is in a connected state.

The R gear 4 pivotally supported by the camera bodies 1 and 2 is driven by the drive motor 1 via gear trains 5a and 5b.
The R fork 3 is axially slidably supported with its legs 3c and 3d being restricted by guides 4b and 4c. Further, the R fork 3 is biased upward by a spring 6 disposed inside the R gear 4, and is held in a state where the legs 3c and 3d are in contact with the inner wall of the R gear 4 (Fig. 2). Furthermore,
The R gear 4 has a comb gear 7a fixed to the encoder 7 via a small gear portion 4a provided at the end of the R gear.
Meshes with. A slit is provided along the outer circumference of the encoder 7, and the rotation amount of the encoder 7, that is, the rotation amount of the R fork 3, is detected by the photo interrupter 14, which is a detecting means.

The R fork 3 is provided with bifurcated portions 3a and 3b at the tip of its stem portion. The bifurcated portions 3a and 3b are provided with grooves 11a of the film spool 11 which are rotatably arranged inside the film cartridge 12.
11b and a predetermined relative phase, the grooves 11a,
Convex portion 1 of film spool 11 arranged between 11b
1c can be inserted. The fitted state is held by the urging force of the spring 6, and the rotation of the R fork 3 can be transmitted to the film spool 11, that is, the connected state (see FIG. 4).

Further, the stem portion of the R fork 3 has a structure shown in FIG.
As shown in the perspective view of FIG. 1, a groove 3e is provided so as to extend around the circumference, and a contact ring 9 made of a conductive material is fixed to the groove 3e. Therefore, the phenomenon that the contact ring 9 is displaced does not occur. The stem portion of the R fork 3 is made of an insulating material.

Then, as shown in FIG. 4, the R fork 3
The forked portions 3a, 3b of the film spool 11 are convex portions 11 of the film spool 11.
When the R fork 3 and the film spool 11 are connected to each other, the contact springs 10a and 10b having spherical contact portions are located at positions facing the contact ring 9 when the R fork 3 and the film spool 11 are connected to each other. And the contact springs 10a and 10b are in a conductive state, that is, the R fork switch 10 including the contact springs 10a and 10b is turned on. Also, FIG.
When the R fork 3 and the film spool 11 are in the non-connected state as shown in, the contact ring 9 and the contact springs 10a and 10b are not in contact with each other and are in the non-conductive state.
The R fork switch 10 is off.

Next, the film loading, feeding, and other operations of the camera of this embodiment having the above-described structure will be described. When the film is fed and rewound, the drive motor 18 feeds and unwinds a gear train for rewinding, and further drives the R gear 4 through the gear trains 5a and 5b, thereby the film spool. 11 is rotated integrally with the R gear 4 to feed and rewind the film. At this time,
The film 7 is rotated at the same time, and the film feed amount is measured by counting the output pulses of the photo interrupter 14.

Regarding the loading of the film and the initial feeding operation of the film, first, when the film cartridge 12 is not loaded as shown in FIG.
Is pushed up by the urging force of the contact spring 10
a and 10b are in a non-conductive state, that is, the R fork switch 1
0 is off.

Therefore, when the back cover (not shown) is opened and the film cartridge 12 is loaded, as shown in FIG.
The fork 3 is pushed and descends. However, R fork 3
Since the forked portions 3a and 3b are not fitted in the film spool 11 and the film spool 11, the film spool 11 remains in the unconnected state. Then, the contact springs 10a and 10b have passed the conduction position, and maintain the non-conduction state, that is, the R fork switch 10 in the off state. However, R fork 3 or film spool 1
Depending on the phase relationship of 1, the two forks 3a, 3 of the R fork 3
In some cases, b may contact the groove portions 11a and 11b of the film spool 11, and the two may be in a connected state. At this time, the R fork switch 10 is turned on. But,
Since the back cover switch 15 remains off, the driving of the R fork 3 is not started yet.

Then, the back cover is closed by closing the back cover.
Is turned on, the drive motor 18 is activated, and the R fork 3 rotates. After a few rotations, the fork 3 of the R fork 3
a and 3b are groove portions 11a and 11b of the film spool 11
, The two are connected as shown in FIG. 4, and the R fork switch 10 is also turned on. At this point, the initial feeding of the film is started. At the same time, the CPU 19 starts counting the output pulses of the photo interrupter 14. Then, when a pulse corresponding to a predetermined amount of film initial feed is counted, it is determined that the initial feed is completed, and the drive motor 18 is stopped to enable the photographing.

The operation of loading the film is shown in FIG.
In step S1, the open / closed state of the back cover is checked by the output signal of the back cover switch 15. Step S when the case back is closed
2, the drive motor 18 is started. Here, the state of the R fork switch 10 is checked. That is, if it is off, it is determined that the film cartridge 12 is not loaded, the process jumps to step S5, the rotation of the drive motor 18 is stopped, and this routine ends. Also, R
When the fork switch 10 is turned on, it is determined that the film spool 11 and the R fork 4 are in the connected state, and the process proceeds to step S4. And film spool 1
The initial feeding of the film is performed by the rotation of 1, and the feeding amount is measured by the rotation amount of the R fork 3 after the R fork switch 10 is turned on by the number of output pulses of the photo interrupter 14. Then, when the predetermined amount of initial feeding is performed, the process proceeds to step S5, and this routine is finished.

As described above, in the initial feeding operation in the film feeding mechanism of the camera of this embodiment, the R on the driving side is set.
Even if the space between the fork 3 and the film spool 11 on the cartridge side is in the idling state at the time of start-up, during that period,
The CPU 19 determines that the film is not fed by the off signal of the output signal of the R fork switch 10.
Therefore, only the amount of actually fed film is detected, and the accurate initial feeding process is performed.

Next, a camera incorporating the film initial feeding mechanism of the second embodiment of the present invention will be described. The configuration of the camera of this embodiment is substantially the same as that of the camera of the first embodiment shown in FIG. 1, but the configurations and operations of the DX code switch, the R fork switch, and the R fork are different. That is, in the present embodiment, the DX code switch 16 detects the DX code of the film, and the presence or absence of the loading of the film cartridge 12 is also detected by the input of the DX code signal. Further, the R fork switch 20 which is the detecting means and the R fork 23 which is the rotation transmitting means applied to the camera of the present embodiment are different from those of the first embodiment in the R
The height of the forked portions 23a and 23b of the fork 23 and the position of the contact ring 29 are different. In the description of the present embodiment, the same reference numerals are used for the same components used in the first embodiment.

7 to 9 show an R fork switch 20 and an R fork switch 20.
FIG. 7 is a cross-sectional view of the film feeding mechanism portion to which the fork 23 is applied in the initial film feeding operation state, and FIG. 7 shows a state in which the film cartridge 12 is not loaded.
FIG. 8 shows a state in which the film cartridge 12 is completely loaded, but the film spool 11 of the cartridge 12 and the R fork 3 are not yet connected. In addition, FIG.
FIG. 7 is a cross-sectional view when the film cartridge 12 is loaded and the R fork 3 is in a connected state.

As shown in FIG. 7, a film cartridge 1
In the state where 2 is not loaded, the R fork 23 has the legs 23c, 2
3d is in contact with the R gear 4, but the contact ring 29 is the contact spring 20 that constitutes the R fork switch 20.
The R fork switch 20 is in the ON state because the R fork switch 20 is arranged at a position where it abuts on the a and 20b.

Then, when the film cartridge 12 is loaded, the R fork 23 is pressed by the film spool 11 and pushed down as shown in FIG. This state is
The R fork 23 and the film spool 11 are not yet connected. Then, the contact springs 20a and 20b are rendered non-conductive, and the R fork switch is turned off.

When the R gear 4 rotates, the bifurcated portions 23a and 23b of the R fork 23 are projected and fitted into the convex portion 11c of the film spool 11, as shown in FIG.
The R fork 23 and the film spool 11 are connected. In this state, the contact springs 20a and 20b are in a conducting state and the R fork switch is in an on state. The configuration other than the above is the same as that of the first embodiment.

The film initial feeding operation when the film is loaded in the camera of the present embodiment having the above-described structure will be described with reference to the flowchart of FIG. 10. First, in step S11, the DX code switch 16 is used to set the D
Check if the X code is entered. If the code is input, it is determined that the film cartridge 12 is loaded, and the process proceeds to step S12. Since the film cartridge 12 is loaded, the R fork 23 is pressed and descends, and the R fork switch 20
The output signal of is once switched from on to off (see FIG. 8).
reference). Then, in step S12, it is confirmed by the state of the back cover switch 15 that the back cover is closed, and the process proceeds to step S13.

In step S13, the drive motor 18 is activated to rotate the R fork 23. Due to the rotation, the forked portions 23a and 23b of the R fork 23 fall into the grooves 11a and 11b of the film spool 11, and the R fork 23 and the film spool 11 are connected. At this time, R
The fork switch 20 is turned on (see FIG. 9).
When it is confirmed that the switch 20 is turned on in step S14, the process proceeds to step S15, and the transmission rotation amount control means built in the CPU 19 starts detection of the film feed amount based on the output pulse of the photo interrupter 14. Then, when the predetermined initial feed amount is reached, the process proceeds to step S16, the drive motor 18 is stopped, and the present routine is ended.

As described above, in the film feeding mechanism of the camera of the present embodiment, in the initial feeding operation when the film is loaded, the error of the initial feeding of the film due to the idling of the R fork is the same as in the first embodiment. Does not happen. Furthermore,
In this embodiment, the loading state of the film cartridge 12 is set to DX.
Since it is detected by the cord switch 16, even if the case back is closed without the cartridge 12 being loaded,
The drive motor 18 does not start. Also, the Patrone 12
R fork switch 20 when the
Since it may be in the ON state, the amount of protrusion of the R fork 23 into the cartridge chamber 2a can be reduced as shown in FIG. 7, and stable operation can be obtained.

[0028]

As described above, in the film initial feeding mechanism of the camera of the present invention, even if there is an idle feeding state at the time of starting between the rotation transmitting means and the shaft member on the cartridge side, the film is fed during that period. Since the amount is not detected, only the amount of actually fed film is measured, which has a remarkable effect such that an accurate initial feeding process becomes possible.

[Brief description of drawings]

FIG. 1 is a main block configuration diagram of a camera including a film initial feeding mechanism according to a first embodiment of the present invention.

2 is a cross-sectional view of the film feeding mechanism of the camera of FIG. 1 in a state where a film cartridge is not loaded.

FIG. 3 is a cross-sectional view of the camera of FIG. 1 with the film feed mechanism mounted in a film cartridge but with the R fork in a non-connected state.

FIG. 4 is a cross-sectional view of the camera of FIG. 1 with the film feeding mechanism section being loaded with a film cartridge and the R fork being in a coupled state. .

5 is a perspective view showing the shape of the stem of the R fork of the film feeding mechanism of the camera shown in FIG.

6 is a flowchart of film initial feed processing of the camera shown in FIG.

FIG. 7 is a cross-sectional view of a film feeding mechanism portion of a camera having a built-in film initial feeding mechanism according to a second embodiment of the present invention in a state where a film cartridge has not been loaded.

FIG. 8 is a cross-sectional view of the camera of FIG. 7 with the film feed mechanism mounted in the film cartridge, but with the R fork in a non-connected state.

9 is a cross-sectional view of the camera of FIG. 7 with the film feed mechanism mounted in the film cartridge and the R fork in a connected state.

10 is a flowchart of film initial feed processing of the camera of FIG.

[Explanation of symbols]

3, 23 …………………… R fork (rotation transmission means) 4 ……………… R gear (rotation drive means) 10, 20 ……………… R fork switch (detection means) 19 …………… CPU (Transmission rotation amount control means)

Claims (1)

[Claims] 1. A film initial feeding mechanism of a camera using a feeding type patrone capable of feeding a film from a drawing port of a film patrone by rotating a film shaft member. Rotation transmitting means for rotating the shaft member to feed the film, rotation driving means for driving the rotation transmitting means, and detecting means for detecting whether or not the rotation transmitting means and the film shaft member are connected to each other. An initial feed mechanism for a camera, comprising: a transmission rotation amount control unit that controls a rotation amount of the rotation transmission unit based on an output detected by the detection unit.