JPH026433Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a film transport status display device.
For example, the present invention relates to a film transport status display device for checking the winding of a film loaded in a camera, the end of the film, and the end of film rewinding.

Conventionally, film winding has been confirmed by using a dummy sprocket and rotating the dummy sprocket during film perforation to light a lamp or swing a display board.

Further, the end of the film has been confirmed by detecting the end of the film using a clutch switch using tension applied to the film or by detecting the stoppage of rotation of the dummy sprocket.

Furthermore, confirmation of completion of film rewinding is performed using a subtraction counter or the dummy sprocket.

However, all of these conventional devices were of a sprocket drive type equipped with a dummy sprocket and a clutch mechanism. A possible drawback of this method of film feeding is that even if the film is not wound normally on the spool, the sprocket will feed the film, and the indication from the dummy sprocket will make it appear as if the film has been wound normally. However, if the spool chamber becomes clogged with film, the film feed will stop before the specified number of sheets is reached. In other words, it has the disadvantage that it is impossible to detect abnormalities during film loading.

The present invention was developed to solve the above-mentioned problems, and is capable of detecting abnormalities during film loading and film transport status, and has functions such as automatic rewinding regardless of whether perforation has broken at the end of the film. It is an object of the present invention to provide a film transport status display device with a simple configuration, in which the following information can be added.

In order to achieve the above purpose, the configuration of the present invention is as follows:
When the film is wound on the film take-up spool, a spool switch outputs an on/off signal as the film take-up spool rotates, and pulse signals from an oscillator are counted and the count value exceeds a predetermined value. a counter that outputs a signal and is cleared when the film transport motor is stopped or when the on/off signal is input; a first light emitting element that emits light in response to the on/off signal; and a second light emitting element that emits light in response to a signal. With this configuration, when the film is wound around the take-up spool and the take-up spool is rotating, the counter is cleared by the on/off signal, and this on/off signal causes the film to be wound in the first position. Displayed by light emitting elements. Also, when the film reaches the end, the take-up spool does not rotate, so the on/off signal is no longer output, and the signal from the counter
The film end is indicated by the second light emitting element.

In addition, in the above configuration, it is possible to operate the auto-rewind mechanism using a signal output from the counter when the film ends, and to operate the rewind auto-stop mechanism using the signal output from the counter when the film rewind is completed. It is also possible to do so.

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

FIG. 1 is a circuit diagram showing a first embodiment of the present invention. One end of the spool switch _SW1 is connected to the power supply Vb, and the other end is grounded and connected to the waveform shaping circuit 1 via a resistor _R1 . This waveform shaping circuit 1 is connected to one input end of an OR circuit 3 via a differentiating circuit 2, and is also connected to one input end of a NAND circuit 5 via a monostable multivibrator 4. The output terminal of the NAND circuit 5 is connected to the power supply Vb via the light emitting diode 6 and resistor _R2 .
It is connected to the. The other input terminal of the NAND circuit 5 is connected to a cartridge presence/absence switch SW ₂ whose one end is connected to the power supply Vb and turns on when film or cartridge is stored in the camera, and a resistor R ₃ whose one end is grounded. Connected to the dots.

The output terminal of the OR circuit 3 is connected to the clear terminal C of the counter 7. The Qn terminal of counter 7 is
The output end of the NAND circuit 8 is connected to the power supply Vb via a light emitting diode 10 and a resistor _R4 that indicates the end of the film, and the output end of the NAND circuit 9 is It is connected to the power source Vb via a light emitting diode 11 that indicates the end of rewinding and a resistor _R5 . Also,
An oscillator 13 is connected to the counter 7 via an AND circuit 12.

One end of a series circuit of shutter switch SW ₃ and resistor R ₆ , which is turned on during shutter setting and turned off after shutter setting, is connected to power supply Vb, and the other end is grounded, and the connection point of this series circuit is connected to OR circuit 14.
is connected to one input end of the One end of a series circuit consisting of sprocket cam switch SW ₄ and resistor R ₇ , which is turned on during film winding and turned off after film winding is completed, is connected to power supply Vb, and the other end is grounded.
The connection point between SW ₄ and resistor R ₇ is connected to the other input end of OR circuit 14 . The output terminal of the OR circuit 14 is connected to the base of the transistor Tr ₁ via an AND circuit 15 and a resistor R ₈ . The emitter of the transistor Tr ₁ is grounded, and the collector is connected to the power supply Vb through a parallel circuit of a relay coil L ₁ and a diode D ₁ . This series circuit of the parallel circuit consisting of the relay coil L ₁ and the diode D ₁ and the transistor Tr ₁ includes relay contacts SW ₅ and SW ₆ for motor switching, the parallel circuit consisting of the relay coil L ₂ and the diode D ₂ , and the transistor.
Series circuit with Tr ₂ and film rewind switch
SW ₇ is connected in parallel. Relay coil L ₂
The collector of a transistor Tr ₂ whose emitter is grounded is connected to the parallel circuit with the diode D ₂ , and the base of the transistor Tr ₂ is connected to the film rewind switch SW ₇ via a resistor R ₉ .
A motor M for transporting (winding and rewinding) the film is selectively connected to the relay switches SW ₅ and SW ₆ .

Film rewind switch SW ₇ connects one end to the power supply.
Vb, and the other end is connected to the input ends of the NAND circuit 9, the AND circuit 15, and the OR circuit 16, respectively, and the input end of the NAND circuit 8 via the inverter 17.

Further, the output terminal of the AND circuit 15 is connected to the OR circuit 1
The output terminal of the OR circuit 16 is connected to the input terminal of the OR circuit 3 via an inverter 18.

The operation of the above-described embodiment configured in this manner will be explained.

When the cartridge is loaded into the cartridge chamber of the camera, the cartridge presence/absence switch SW ₂ is turned on and a signal of "1" is input to the input terminal of the NAND circuit 5. Assuming that the shutter has already been set at this time, the motor M is stopped because the shutter switches _SW3 and _SW4 are off.

Therefore, when the shutter is released, the shutter runs and closes after a certain period of time. At the same time as this shutter is closed, the shutter switch SW ₃ is turned on. As a result, a signal of "1" is input from the shutter switch _SW3 to the AND circuit 15 via the OR circuit 14. At this time, since the rewind switch SW ₇ is off, an inverted "1" signal is input to the other input terminal of the AND circuit 15, and therefore a "1" signal is output from the AND circuit 15. , turns on transistor Tr ₁ . Therefore, the relay coil _L1 is excited, and the relay switch _SW5 is switched to rotate the motor M, for example, in the forward direction.

The spool, which rotates under the rotational drive of this motor M, winds the film and inputs an on/off signal from the spool switch SW ₁ to the clear terminal C of the film 7 via the waveform shaping circuit 1, the differentiation circuit 2, and the OR circuit 3. let At this time, the counter 7 is counting the pulse signals output from the oscillator 13, but since it is intermittently cleared by the on/off signal from the spool switch _SW1 ,
A “1” signal is not output from the Qn terminal of counter 7. Further, the on/off signal from the spool switch SW ₁ is input to the monostable multivibrator 4 via the waveform shaping circuit 1 and the differentiating circuit 2, and further,
Since this signal is input to the input terminal of the NAND circuit 5, the logic with the cartridge presence/absence switch _SW2 is adopted in the NAND circuit 5, and the light emitting diode 6 lights up to confirm that the film has been wound.

Note that when the motor M is not rotating, that is, when the film is not being wound up or rewound, shutter switch SW ₃ and sprocket cam switch SW ₄ are off, and rewind switch SW ₇ is off. Therefore, OR circuit 16
A "0" signal is output from the inverter 18, inverted by the inverter 18, and a "1" signal is input to the clear terminal C of the counter 7, so that the counter 7 is cleared. Therefore, while the motor M is stopped, the count-up causes
A “1” signal is never output from the Qn terminal.

Then, the shooting of the designated frame of the film is completed,
When the film reaches the end, the spool cannot rotate even if the winding motor M rotates, so no on/off signal, that is, a signal of "1" is input to the clear terminal C of the counter. As a result, the count value exceeds a predetermined value, and a signal of "1" is output from the Qn terminal and input to the NAND circuit 8. On the other hand, since the rewind switch SW ₇ is off, a signal of "1" is input to the NAND circuit 8 via the inverter 17. Therefore, the output of the NAND circuit 8 becomes "0", the light emitting diode 10 emits light, and the end of the film is confirmed.

Next, to explain the film rewinding operation, when the film rewinding switch SW ₇ is turned on, the transistor Tr ₂ is turned on and the relay coil L ₂ is turned on.
is energized and relay switch SW ₆ is switched,
For example, the motor M reverses in the rewinding direction. At this time, the spool rotates, so the spool switch
An on/off signal is output from SW ₁ and the counter 7 is cleared. When rewinding is completed, the on/off signal is no longer input to the clear terminal C of the counter 7, so the counter 7 counts up (overflows) and outputs a signal of "1" from the Qn terminal.
It is input to one input terminal of the NAND circuit 9. on the other hand,
Since the rewind switch SW ₇ is on, a signal of "1" is also input to the other input terminal of the NAND circuit 9. Therefore, a signal of "0" is output from the NAND circuit 9, and the light emitting diode 11 emits light.
This confirms the completion of film rewinding.

FIG. 2 is a diagram for explaining the timing of the switches, etc. in the above embodiment, where A is the shutter opening, B is the signal from the shutter switch _SW3 ,
C is the signal from sprocket cam switch SW ₄ ,
D is the shutter set state, E is the motor state,
Each is shown below.

In the drawing, when the shutter is released at time _t1 , the shutter setting is released as shown at D, and the shutter is opened as shown at A to provide the appropriate amount of light to the film, and then closed at time _t2 . During this time, since the shutter switch _SW3 and the sprocket cam switch _SW4 are off as shown at B and C, no current is applied to the motor M as described above, and the motor M is stopped as shown at E. At time _t2 , the shutter switch _SW3 is turned on in synchronization with the closing of the shutter, energizing the motor M, which gradually charges the shutter, and at time _t3 the sprocket is turned on. Cam switch SW ₄ is turned on. Therefore, even if the shutter set is completed at time _t4 , the motor M continues to be
connects the rotation and winds the film at time t ₅
When winding of the film by a predetermined amount is completed, the sprocket cam switch _SW4 is turned off, and the motor M is stopped.

Next, a second embodiment of the present invention is shown in FIG.

In FIG. 3, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted.

This embodiment uses the spool switch of the first embodiment.
In place of SW ₁ , an easy load switch SW ₈ that outputs an on/off signal in conjunction with the easy loading claw is provided, and the cartridge presence/absence switch SW ₂ and NAND circuit 5 of the first embodiment are omitted. It is.

According to this embodiment, since an on/off signal is output when the film is wound around the spool and rotated, the film winding during easy loading can be confirmed by the light emitted from the light emitting diode 6.
Further, similarly to the first embodiment, the light emitting diode 10
The end of the film can be confirmed by this, and the end of film rewinding can be confirmed by the light emitting diode 11.

FIG. 4 is a circuit diagram showing a third embodiment of the present invention.

In FIG. 4, parts corresponding to those in FIG. 3 are denoted by the same reference numerals, and their explanation will be omitted.

This embodiment utilizes the second embodiment to automatically rewind the film at the film end.
In addition, it is provided with so-called auto-rewind and auto-stop functions that automatically stop the motor M when the film is completely rewound into the cartridge.

As shown in Figure 4, the Qn terminal of counter 7 is
φ of the flip-flop 20 via the OR circuit 19
connected to the terminal. Further, a manual switch 21 is connected to the other input terminal of the OR circuit 19. This manual switch 21 is used when the battery is exhausted and film rewinding is stopped.
This prevents the motor M from rotating in the film winding direction due to battery replacement.

The Q terminal of the flip-flop 20 is connected to a resistor R ₉ , an AND circuit 15, and an OR circuit 16 via a delay circuit consisting of a resistor R ₁₀ and a capacitor C, and a buffer B. Further, the terminal of the flip-flop 20 is connected to the D terminal of the flip-flop 20.
The R terminal of the flip-flop 20 is connected to the output terminal of the inverter 18.

The operation of the third embodiment configured in this way will be described below.

When the leading end of the film is wound around the easy loading claw and the spool is rotated, an on/off signal is emitted from the easy loading switch SW ₈ , the light emitting diode 6 emits light, and winding and winding of the film is confirmed.

When the film reaches the end, the on/off signal is no longer output from easy load switch SW ₈ , so "1" is output from the Qn terminal of counter 7 as described above.
A signal is outputted and inputted to the φ terminal of the flip-flop 20 via the OR circuit 19. Therefore,
A signal of "1" is output from the Q terminal of the flip-flop 20, and a signal of "0" is output from the terminal. As a result, the light emitting diode 11 emits light,
In addition to displaying that the film is at the end, it also displays that it is in the automatic rewind state.

The "1" signal output from the Q terminal of the flip-flop 20 is delayed for a predetermined time by the delay circuit, and then input to the base of the transistor Tr ₂ via the resistor R ₉ , turning on the transistor Tr ₂ and running the AND circuit. Applying an inverted "0" signal to the input terminal of Tr 15 turns off the transistor Tr ₁ , thus energizing the relay coil L ₂ and demagnetizing the relay coil L ₁ to switch the relay switches SW ₅ and SW ₆ .
Motor M is rotated in the rewinding direction. When the motor M is rotating in the rewinding direction, the spool is rotating and an on/off signal is being output from the easy load switch _SW8 , so a signal of "0" is being output from the Qn terminal of the counter 7.

When the film is completely rewound, the on/off signal is no longer output from the easy load switch _SW8 , so a signal of "1" is output from the Qn terminal of the counter 7, and the flip-flop 20 outputs a signal of "1".
Inverts the signal output from the Q terminal of the terminal. As a result, the light emitting diode 11 is turned off to indicate the end of rewinding, and after a predetermined period of time determined by the delay circuit has elapsed, the transistor Tr ₂ is turned off and the motor M is stopped. A reset signal is input to the R terminal of the flip-flop 20.
operation is stopped.

5 to 7 show the structure of a fourth embodiment of the present invention, FIG. 5 is a circuit diagram, FIG. 6 is a sectional view of the main part of the film winding device, and FIG. 7 is a plan view thereof. .

In this embodiment, the film is wound around the spool 22 and an easy loading switch SW ₈ is connected to the easy loading claw 23 and is turned on and off intermittently when the spool 22 is rotated. A switch SW ₉ is connected to the pawl 23 and is turned off when the
It has so-called auto-rewind and rewind auto-stop functions.

In FIG. 5, switch SW ₉ is connected to NAND circuits 5 and 9 and an inverter 26 via an inverter 25. In FIG. In addition, the inverter 26
is connected to the reset terminal R of flip-flop 20.

In FIGS. 6 and 7, one end of the outer periphery of the cylinder 24 housed and fixed in the spool 22 has a
Comb tooth-shaped electrodes 24 formed with a predetermined width at predetermined intervals
a, an annular electrode 24b on the other end side, and an annular electrode 24b on the middle part,
A common electrode 24c is attached to each. A rotating contact piece 2 is attached to the inner end of the easy loading pawl 23 that rotates integrally with the spool 22.
3a and 23b, the rotary contact piece 23a bridges the common electrode 24c and the comb-like electrode 24a when the film is wound around the spool 22 to constitute the easy load switch _SW8 ; When the film is not wound around the spool 22, 23b bridges the common electrode 24c and the annular electrode 24b to form the switch _SW9 . and,
As shown by the two-dot chain line in FIG. 7, the common electrode 24c is connected to the power supply Vb, and the comb-shaped electrode 24c
b is connected to the resistor _R1 and the waveform shaping circuit 1
(Fig. 5), and the annular electrode 24b is a resistor.
R ₁₁ and inverter 25 (fifth
(Figure).

Therefore, when the perforation of the film is hooked on the easy loading claw 23 and the spool 22 is rotated manually or by the motor M,
As the film is wound around the spool 22, the easy loading pawl 23 rotates counterclockwise around the hinge shaft 27, and as a result, the rotating contact piece 23a connects the comb-shaped electrode 24a and the common electrode 24c. As the spool 22 contacts the joint and rotates, the easy load switch SW ₈ outputs an on/off signal. Furthermore, when winding the film, the rotating contact piece 23b does not come into contact with the joint between the annular electrode 24b and the common electrode 24c.
Switch SW ₉ is turned off.

The operation of the third embodiment of the present invention configured as described above will be explained.

When the film is wound around the spool 22,
In other words, when winding and rewinding the film,
Since switch SW ₉ is off, inverter 2
A signal of "0" is input to the R terminal of the flip-flop 20 via the flip-flop 5 and 26, and the NAND circuit 9
A signal of “1” is input to . Also, when the film reaches the end, the counter 7 will change as described above.
The “1” signal from the Qn terminal is the flip-flop 2
On the other hand, since the D terminal of the flip-flop 20 is always at the "H" (high) level, a "1" signal is output from the Q terminal.
It is input to the NAND circuit 9 and is also connected to the transistor via the resistor R ₁₀ , diode D ₃ and resistor R ₉ .
It is input to the base of Tr ₂ and turns on transistor Tr ₁ . At this time, the AND circuit 15 is inverted and outputs a "0" signal to turn off the transistor _Tr1 .
As a result, the light emitting diode 11 emits light to indicate that the film is being rewinded, and the relay switches SW ₅ and SW ₆ are switched to start rewinding the film. Furthermore, at this time,
The “1” signal output from the Q terminal is connected to the resistor R ₁₀ ,
Since a signal of "0" is input to the C terminal of the counter 7 via the buffer B, the OR circuit 16, the inverter 18 and the OR circuit 3, the counter 7 is not cleared.

When the film rewinding is completed, the on/off signal is no longer output from the easy load switch SW ₈ and the switch SW ₉ is turned on. As a result, the light emission of the light emitting diode 11 is stopped by a signal of "1" output from the switch SW ₉ , the flip-flop 20 is reset, the motor M is stopped, and the counter 7 is cleared.

Note that the present invention is not limited to the embodiments described above, and various modifications can be made without changing the gist of the invention.

As described in detail above, according to the present invention, the structure can be simplified without the need for a dummy sprocket or a clutch mechanism, and even if the perforation of the film occurs, the film transfer state can be reliably adjusted, e.g. It is possible to provide a film transport status display device that can reliably display winding failure, film non-travel, film end, film rewind completion, etc. Note that by using the signal from the counter of the device of the present invention, it is possible to provide functions such as auto-rewind and rewind auto-stop, thereby simplifying the operation.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing the configuration of the first embodiment of the present invention, and Figs. 2 A to E are timings of shutter opening, shutter switch signals, sprocket cam switch signals, shutter set state, and motor on/off state. 3 is a circuit diagram showing the configuration of the second embodiment of the present invention, FIG. 4 is a circuit diagram showing the configuration of the third embodiment of the present invention, and FIG. 5 is a circuit diagram showing the configuration of the third embodiment of the present invention. FIGS. 6 and 7 are a circuit diagram showing the structure of the embodiment, and a sectional view and a plan view showing the structure of the easy load switch and the switch turned off during film winding used in the fourth embodiment. 6, 10... Light emitting diode, 7... Counter, 13... Oscillator, 22... Spool, 23...
...Easy loading claw, SW ₁ ...Spool switch, SW ₂ ...Patrone switch, SW ₈ ...
...Easy load switch, M...Motor.

Claims (1)

[Scope of utility model registration request] a spool switch that outputs an on/off signal as the film take-up spool rotates when the film is wound on the film take-up spool;
a counter that counts pulse signals from an oscillator, outputs a signal when the count value exceeds a predetermined value, and is cleared when the film transport motor is stopped or the on/off signal is input; A film transport status display device including a first signal generating element generated by the on-off signal and a second signal generating element generated by the signal from the counter.