JPS62238541A - No-load feed control device for motor-driven camera - Google Patents

Abstract

PURPOSE:To inhibit a photographing operation in an incorrect state that a rewinding fork has run on a cartridge shaft, by providing a fork position detecting means and a control means for stopping forcibly a no-load feed operation. CONSTITUTION:The title device is provided with a fork position detecting means for detecting the first axial direction position where a rewinding fork 1 is engaged to a film cartridge shaft (a) and the second axial direction position in a state that said fork has run on the film cartridge shaft (a), and a control means for stopping forcibly a no-load feed operation by an automatic no-load feed means, in case it has been detected that the rewinding fork is in the second axial direction position, by the fork position detecting means, after a prescribed time has elapsed, from the time when a no-load feed has been started by the automatic no-load feed means. In case the rewinding fork 1 remains run on the film cartridge shaft (a), although a no-load feed has been executed, as shown in the figure (b), the no-load feed operation is stopped by discriminating its state. In this way, photographing operation in an incorrect state can be inhibited.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to control of the pneumatic feed 9 when loading a film cartridge in an electric camera.

(Prior art) In recent years, electric cameras that use a motor as a drive source to wind film have become commonplace, and when loading a film cartridge, a part of the film leader is automatically placed on the spool by a predetermined amount (for example, three frames of film). This is commonly known as autoloading (hereinafter abbreviated as AL), which is air-feeding for several pieces in order to wind it.
More and more devices are equipped with mechanisms.

In addition, in order to simplify the loading of the film cartridge into the camera body, the rewinding fork in the cartridge chamber is configured to be movable in the axial direction (upward for the type with the rewinding fork on the upper side). Increasingly, the rewinding fork is designed so that the protrusion of the rewinding fork itself does not get in the way when the rewinding fork and the film cartridge shaft are engaged and set.

Conventionally, in an electric camera equipped with the above-mentioned AL mechanism and rewind fork axial movement mechanism, there has been an incorrect situation in which the first rewind fork does not engage with the film cartridge shaft and remains on the film cartridge after loading the film cartridge into the camera body. Therefore, there were many cases where a blank feed related to AL was performed. In this way, if the rewinding fork rests on the film cassette shaft and is continuously fed, in many cases, the vibration will cause the rewinding fork to shift its position and engage with the film cassette shaft. If you continue to shoot with the film stuck on the cartridge for a long time, the load on the film being pulled out from the cartridge will increase, and the winding operation will slow down or stop working properly. Problems are likely to occur.

In addition, in cameras equipped with a mechanism that detects the film transport status and detects when all frames of film have been wound, the load to pull out the film becomes large even if the film is halfway through, making it difficult to transport the film. There is a possibility that the film may slow down or stop, resulting in a false detection that all frames of the film have been completed, and a solution to this problem was desired.

(Object of the Invention) The present invention has been made in order to deal with the above-mentioned conventional problem. It is an object of the present invention to provide an electric camera jump feed control device that can prohibit photographing operation in an illegal state by determining the state and stopping the jump feed operation.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 to 3 show an embodiment of the present invention, in which FIG. 1 is an exploded perspective view of a rewinding fork, and FIG. 2 is a sectional view of the rewinding fork. FIG. 3 is a perspective view showing the configuration of the winding/rewinding mechanism.

In FIG. 1, a rewinding fork 1 is loosely inserted into a rewinding shaft 4, which will be described later, so as to be movable in the vertical direction (axial direction). Reference numeral 2 denotes a rewinding gear that transmits the drive of the motor during rewinding to the rewinding fork 1, and 3 a coil spring which serves to elastically press the rewinding fork 1 in the direction of engagement with a patrone shaft a, which will be described later. 4 is a rewinding shaft with an upper end 4a
is fixed to the rewinding gear 2 with screws 5, and the lower end 4b is fitted to the rewinding fork 1, so that the rewinding gear 2 and the rewinding fork 1 can rotate together.

Reference numeral 6 denotes a rewinding fork position detection switch, which detects whether the rewinding fork 1 is properly engaged with the cartridge shaft a or remains on top of the cartridge shaft a, based on the height position of the fork 1.

In Fig. 2, Fig. 1(a) shows a state in which the rewinding fork 1 and the cartridge shaft a are properly engaged, and (1) Fig. 1 shows a state in which the rewinding fork 1 is not properly engaged and the rewinding fork 1 is at the upper end of the cartridge shaft a. Indicates the condition of the vehicle being stranded.

Note that 7 in the figure indicates the base plate of the camera body.

In Fig. 6, 1o is a winding/rewinding motor;
A winding pinion 11 is provided on the output shafts 10a and 10b, respectively.
A rewinding pinion 24 is fixedly installed.

The winding pinion 11 is meshed with a gear 13a fixedly attached to the upper part of the rotating shaft of a sun gear 130 via an intermediate gear 12. 14 is a planetary gear for driving a sprocket, which is rotatably supported by a +jil 15a on a first planetary arm 15 that is coaxially supported with the sun gear 13 so as to be swingable, and is in mesh with the sun gear 13. There is. Reference numeral 19 denotes a planetary gear for driving the winding system spool, which is rotatably supported by a shaft 16a on a second planetary arm 16 that is coaxially supported to be swingable with the sun gear 1S, and meshed with the sun gear 13. are doing. Although the first planetary arm 15 and the second planetary arm 16 are coaxially supported, they are separate members. 17 is the sun gear 15 and the first planetary arm 15;
A spring interposed between supports the swinging force due to friction against the first planetary arm 15.

Reference numeral 18 denotes a buffer spring, which is an arm portion 151 of the first planetary arm 15).
and the arm portion 16b of the second planetary arm 16, and the rising portion 16c of the second planetary arm 16 abuts the side edge of the first planetary arm 15, thereby changing the position of the second planetary arm 16. The swinging force of the planetary arm 16 provided by the buffer spring 18 is set to be weaker than the rotational force provided by the spring 17.

A sprocket 20 is rotatably supported by the camera body, and a sprocket gear 20a is fixed on the shaft of the sprocket, and when the first planetary arm 150 swings counterclockwise, the planetary gear 20a is rotated. It is designed to mesh with 14. Reference numeral 21 denotes a take-up spool, which is disposed coaxially with the above-mentioned motor 10 and is connected to a spool gear 23 via a known spool friction mechanism 22, and the spool gear 25 is connected to the above-mentioned second planetary arm. 16
By swinging in the zero counterclockwise direction, it meshes with the planetary gear 19 described above.

Reference numeral 25 denotes a rewinding sun gear, which is rotatably supported by the camera body and is always meshed with the rewinding pinion 24 described above. Reference numeral 26 denotes a planetary gear for rewinding, which is rotatably supported by a shaft 27m on the third planetary arm 27 and is meshed with the sun gear 25. A spring 28 is interposed between the sun gear 25 and the third planetary arm 27, and applies a swinging force to the third planetary arm 27 due to friction. Reference numerals 29 and 30 are positioning pins for regulating the swing range of the third planetary arm 27, which are implanted in the camera body. 31 , 52 , 54 , 55 and 36 are rewind transmission gears connected to the rewind gear 2 . As shown in FIGS. 1 and 2, the rewinding gear 2 is rotatably supported by the camera body, and below the rewinding gear 2, a rewinding fork 1 is connected in the vertical direction (axially) via a rewinding shaft 4. A nine rewind fork position detection switch 6 is disposed between the rewind gear 2 and the rewind fork 10 so as to come into contact with the rewind fork 1 when the rewind fork 1 moves upward. be.

Next, the operation of the configuration shown in FIG. 3 constructed as above will be explained. When the motor 10 rotates counterclockwise, the sun gear 13 also rotates counterclockwise via the pinion 11, intermediate gear 12, and gear 13a. The planetary gears 14, 19 are urged to swing counterclockwise by the gears 14 and 19, and mesh with the sprocket gear 20a1 and the spool wheel 23, respectively. Therefore, the driving force of the motor 10 in the counterclockwise direction is from the sun gear 15 to the planetary gear 14 to the sprocket AT wheel 20a.
→ Sprocket 20 and sun gear 13 → Planet gear 19 → Spool gear 25 → Spool friction mechanism 2
2->The film is electrically wound by the winding Lisbourg 21.

On the other hand, when the Tanabata 10 rotates counterclockwise, the sun tooth 25 rotates clockwise via the pinion 24, and the third planet arm 27 rotates clockwise until it comes into contact with the pin/29 by the spring 28. The gear 51 swings and is separated from the gear 31.
The rotation of the motor 10 is not transmitted to.

Next, when the motor 10 rotates clockwise, the fifth planetary arm 27 swings counterclockwise until it comes into contact with the bin 30, the planetary gear 26 meshes with the gear 31°, and the driving force of the motor 10 is transmitted. be done.

Therefore, the clockwise driving force of motor) 10 is as follows: sun gear 25→planet gear 26→transit wheels 31, 32, 35°34.
55, 56→rewinding gear 2→rewinding fork 1, and electric rewinding of the film is performed.

Note that during this electric rewinding, the sun gear 13 as a winding transmission system rotates clockwise, so the first and second planetary arms 15 and 16 also swing clockwise, causing both planetary gears 14. 19 are disengaged from the sprocket gear 20a and the spool gear 23, respectively. Therefore, both sprocket 20 and take-up spool 21 become free.

Next, a circuit for controlling the winding/rewinding motor shown in FIG. 3 will be explained with reference to FIG. 4.

10 is a motor, and S is a known back cover switch which is turned on at the same time as the back 1 is closed. 6 is the rewinding fork position detection switch shown in FIGS. 1 to 3;
is turned ON when the cartridge is riding on the cartridge shaft aK without being engaged. Day.

is a rewind switch, which is turned ON when all frames of the film have been wound. S4 is a film presence switch which is ON when the film is being pulled out from the cartridge, and becomes Ob'F when the film is rewound and returned to the cartridge. C is a counter circuit, which is connected to the back cover switch S through an inverter at the input end.

output is connected, and when a high level signal is input, the film is fed until the unexposed part of the film is set in the aperture (this is a blank feed during AL, and usually winds up about 3 frames).
A high level signal is output during counting, and a low level signal is output after the count ends. In this timer circuit, the Q output of flip-flop F is connected to the input terminal, and the input terminal of OR gate 0101 is connected to the output side.When a high level signal is input, counting starts, and during that time, the A repeat signal is output, and after the count ends, a low level signal is output. The count time of the timer circuit T is set to be shorter than the count time of the counter circuit C (for example, to the extent of winding up one frame). A1 is an AND gate, and the input terminals are each inverter 1. The output of the back cover switch S1 and the rewinding fork position detection switch 6 are connected through the connection 2,
The output end is set manually by S of the flip-flop Fl.
It is connected to the. Note that the output of the back cover switch S1 is connected to the reset manual power R of the flip-flop F1. The output of the OR gate 01 is connected to the other input terminal of the AND gate A2, and the output terminal is connected to the resistor R2 and the transistor Tr1. A3 is an AND gate, the input end of which is connected to the above-mentioned rewind switch S3 and the above-mentioned film alignment switch S4, respectively, and the output end is connected to N via resistor (4).
It is connected to the base of the transistor Tr40 (PN), and is also connected to the base of the transistor Tr5 (NPN) via the inverter 6 and the resistor R. The above OR gate 0. The output of the rewind fork position detection switch 6 is connected to the other input end of the rewind fork position detection switch 6.

The above transistor Tr 1 *Tr2 tTr5 , T
r4 constitutes a bridge circuit and controls the drive of the motor 10.

The operation of the circuit configured as above will be explained.

First, when a film cartridge is set in the camera and the back cover is closed, the back cover switch S1 is closed and a high level signal is supplied to the AND gate A1 and the counter circuit C. Since a high level signal is outputted, a high level signal is input to the 1 input terminal of A2. Then, the counter circuit C supplies a high level signal to the input terminal of the AND gate A2 until the count ends.

When the rewind fork 1 is engaged with the cartridge shaft load when the back cover is closed, the rewind fork position detection switch 6 is open, and a no-level signal is input to one input terminal of the OR gate 01. Therefore, from the output terminal, AND
A high level is always output to the remaining one input terminal of gate A2, and until the counter circuit C finishes counting, AN
DK) A high level is output from the output terminal of A2.

Therefore, the base of the transistor Tr2 is turned on and the pace of the transistor Tr becomes low level via the inverter 5, so the positive side of the power supply B→
Transistor "'r+ → Motor 10 → Transistor Tr
2→Power supply B A current flows, and at the point where the counter circuit C finishes counting, the motor 10 rotates forward (counterclockwise in FIG. 3), that is, is automatically fed υ.

On the other hand, if the rewind fork 1 does not engage with the cartridge shaft a and remains on top of the cartridge shaft a when the back cover is closed, the rewind fork position detection switch 6 remains closed, and one side of the OR gate 01 A low level signal is supplied to the input terminal of AND gate A1, and a high level signal is inputted to the other input terminal of AND gate A1 via inverter E2. Then, the output of the AND gate A becomes a high level, and the q output of the flip-flop IP1 becomes a high level, so the timer circuit TK high level signal is input and counting starts. Since a high level signal is output to the input terminal of the AND gate A2O, a high level signal is supplied to one input terminal of the AND gate Positive rotation,
Automatic jump feed starts. Then, when the timer circuit T finishes counting, the output of the timer circuit T becomes low level, the output of OR gate 01 and the output of AND gate A2 become low level, and the pace of transistor Tr2 is set to low level via resistor R2. 0FIF, the pace of the transistor Tr1 becomes constant through the inverter 5 and the resistor R1, and the rotation of the motor 10 is stopped, and the automatic idle feeding is stopped midway. However, if the rewinding fork 1 engages with the cartridge shaft a while the timer circuit T is counting, the rewinding fork position detection switch 6 is opened midway, and one input terminal of the OR gate 01 is set to high level. The timer circuit T
(The output of OR gate 01 is a high level signal, so it is an AND game) The blank feed will be carried out to the end.

After that, a switch (not shown) is used to release 1
The motor rotates forward frame by frame, and the film is wound up.

When all the frames have been photographed, the rewind switch 85 is turned on. In this state, the film presence switch S4 is ON, and high-level signals are supplied to both input terminals of the AND gate A3, so that the output terminal becomes high-level. As a result, the transistor Tr40 pace becomes high level and turned on, and the transistor TrS pace becomes low level through the inverter 6, so that the power supply B
Current flows to the negative side of the power source B, and the film stacking switch S4 is turned OFF', that is, the motor 10 rotates in the reverse direction (until the film is completely rewound to the cartridge). (clockwise rotation in FIG. 5) to perform automatic rewinding.

A characteristic feature of this embodiment is that if the rewinding fork 1 is properly engaged with the cartridge shaft a during empty feeding as an AL operation, the normal empty feeding operation (for example, for 3 frames) is performed. On the other hand, for a predetermined period of time (for example, 1 hour) from the start of air transport,
In an incorrect state where the rewind fork 1 rides on the cartridge shaft a even after the number of frames), the idle feed operation is stopped midway. Therefore, in this embodiment, normal photographing operations (including winding of each frame) are prohibited in an illegal state in which the rewinding fork 1 rides on the cartridge shaft a. was able to solve the problem.

When the blank feed as an AL operation stops midway, the photographer understands that the rewind fork 1 is not properly engaged with the cartridge shaft a, and opens the back cover and rotates the cartridge slightly. If the back cover is closed again after proper engagement, the idle feed operation as an AL operation will be performed properly this time. Note that even if the rewinding fork 1 was on the cartridge shaft a when the back cover was closed, the reason why the rewinding fork 1 was started on the cartridge shaft a was due to the vibration of the empty feeding operation. This is because there are many cases where the camera and the camera engage with each other, and the operation of this embodiment prevents the photographer from having to perform unnecessary operations.

FIG. 5 shows a motor control circuit as another embodiment of the present invention, in which OR gate O2, OR gate O, AND gate A4, flip-flop F2, and inverter F are added to the circuit of FIG. This is a circuit with a

One input terminal of the OR gate 02 is connected to the rewind fork position detection switch 6, the other input terminal is connected to the output signal of the film alignment switch S4, and the output terminal is connected to the reset input terminal R of the flip-flop F2. ing. One input terminal of Os is connected to AND gate, the other input terminal is connected to the Q output signal of flip-flop IP2, and the output terminal is connected to inverter 6 and resistor 14.
K-connected. One input terminal of the AND gate A4 is connected to the output terminal of the counter circuit C, the other input terminal is connected to the output signal of the output terminal of the OR gate 01 via an inverter F, and the output terminal is connected to the flip-flop lP2O set input terminal. Connected to S.

The operation of the circuit shown in FIG. 5 constructed as above will be explained.

The basic operation is the same as the circuit explained in FIG. 4, but when the air feeding 9 in the AL operation shown in FIG. 4 is stopped midway,
The low level output signal of OR gate 01 is supplied to one input terminal of AND7/' to A4 via an inverter F, and the high level signal is supplied to the other input terminal from the counter circuit C which is in the middle of counting. A level is input, and a high level is output from the output terminal of this AND gate A4. Then, the set input terminal S of flip-flop F'2
Since a high level is input to , the Q output becomes a high level, one input of the OR gate Os becomes a high level and outputs a high level, and the motor 10 rotates in the reverse direction (clockwise in Fig. 3). Rewinding is performed. When the film alignment switch S4 is turned off, one input terminal of the OR gate 02 becomes a high level, and a no-repel signal is supplied from the output terminal to the reset input terminal R of the flip-flop F2, and the flip-flop P2 is reset. be done.

Then, the output Q of the flip-flop F2 becomes low level, the output signal of the OR gate 03 also becomes low level, and the motor 10 stops.

However, before the film positioning switch S4 is turned off, that is, during rewinding, the rewinding fork 1 engages with the film position . A high level signal is supplied to the input terminal of flip-flop F2.
A high level is input to the reset human power R, and the motor 10 stops reversing as described above. Then, the back cover switch S1 is turned on, and the rewind fork position detection switch 6 is turned on.
Since is OFF □, the motor 10 rotates forward (counterclockwise in FIG. 3) until the counter circuit C finishes counting, as described in FIG. 4, and idle feeding is resumed. Note that the counter circuit C in this case is reset to the initial state and starts counting when the detection switch 6 is inverted from ON to OP'y.

This other embodiment differs from the embodiment shown in FIG. 4 above from the start of empty feed as an AL operation.
r Even after a certain period of time, the rewind fork 1 is stuck in Patrone city ha
In the fourth aspect of the present invention, the fast forwarding operation is not only stopped midway, but also rewound. When rewinding the film, use the rewind fork 1.
The driving force of the motor 10 is transmitted to the driving side, and even if the fork 1 is riding on the cartridge axle load, in most cases during rewinding, the fork 1 and the cartridge l1IIfL change to a meshed state. The embodiment shown in FIG. 5 can provide better operability for the photographer.

In the above-mentioned embodiment, the malfunction in which the rewinding fork 1 rides on the cartridge shaft a during the idle feed as an ALi operation is caused by stopping the idle feed midway or after stopping the idle feed in the middle of the idle feed. Although the photographer is notified by rewinding, it is also effective to give a warning by displaying, for example, I, ED, liquid crystal, etc.

(Effects of the Invention) As explained above, in the case where the rewinding fork remains on the fir A/A patrone shaft even though it is desired to execute the idle feed, the present invention determines the state and Since the feed IIth operation is stopped, it is possible to provide a pneumatic feed control device for an electric camera that can prohibit photographing operation in an illegal state where the rewind fork rides on the cartridge shaft.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a rewinding fork in an electric camera according to an embodiment of the present invention. FIG. 2 is an explanatory cross-sectional view showing a state in which the rewinding fork shown in FIG. 1 is engaged with the cartridge shaft, and a state in which it is not engaged (the state in which the rewinding fork rides on the cartridge shaft). FIG. 3 is a perspective view showing a winding/rewinding mechanism of a power camera as an example. FIG. 4 is a control circuit diagram of the winding/rewinding motor in FIG. 3. FIG. 5 is a control circuit diagram of a winding/rewinding motor as another embodiment of the present invention. 1... Rewinding fork a... Film cartridge shaft 6... Rewinding fork position detection switch 10... Winding/rewinding motor 21... Winding spool S,... Back cover switch C...Counter circuit T...241 circuit

Claims (2)

[Claims] (1) An electric camera in which a rewinding fork that engages with the film cartridge shaft is configured to be movable in the axial direction, and has an automatic blank feed means for winding a predetermined amount of film around the spool when loading the film cartridge. a fork position detection means for detecting a first axial position of the rewind fork in mesh with the film cassette shaft and a second axial position of the rewind fork in a state where it remains on the film cassette shaft; and the automatic blank feed. When the fork position detecting means detects that the rewinding fork is at the second axial position after a predetermined period of time has elapsed from the time when the automatic empty feeding means starts empty feeding, the automatic empty feeding means performs an empty feeding operation. What is claimed is: 1. A free feed control device for an electric camera, comprising: a control means for forcibly stopping the camera. (2) The electric camera jump feed control device according to claim 1, wherein the control means performs a rewinding operation after a forced stop of the jump feed operation.