JPH0643783Y2 - Alarm device for electric hoist - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to an electric winding device for rewinding a film by a driving force of a motor that is removably connected to a winding mechanism on a camera side, and more specifically, a film end device. The present invention relates to an alarm device that issues an alarm when an abnormal state such as a state in which a film is wound up to the end is detected and a power supply voltage is lowered.

(B) Prior Art Generally, an electric hoisting device (hereinafter referred to as hoisting device) is
The camera and the hoisting device can be mounted by screwing the tightening screw having the same male thread as the tripod screw into the tripod screw hole provided on the bottom side of the camera from the hoisting device side and tightening. There is. Along with this mounting, the drive coupler on the winding device side and the driven coupler on the camera side are engaged with each other, and the winding device and the camera are electrically coupled. For example, a film winding start signal from the camera side. A film winding completion signal or the like is transmitted to control the start and stop of the motor of the winding device.

By the way, in such a winding device, since the motor is driven by the battery, when the voltage of the power supply battery is lowered, for example, in the case of continuous shooting, the number of shooting frames within a predetermined time is significantly reduced, Finally, the winding operation becomes impossible. If the motor stops rotating while the film is being wound, the shutter release becomes impossible and the chance of photographing at a certain angle is lost.

Also, when the film is wound more than the number of pictures that can be taken on the camera side, the film end portion is only fixed to the core of the film patrone, so the film tension is applied to the film by the motor of the winding device. As a result, not only the edge of the film may be peeled off and the perforation may be damaged, but also the motor may be heated and the power source may be wasted. Therefore, it is desirable that the hoisting device be configured to give an alarm when the above-mentioned abnormal state occurs.

Conventionally, as an alarm means in such a case, for example, there is one configured to light or blink a light emitting element such as a light emitting diode when an abnormality is detected. However, there is a possibility that the alarm may be overlooked only by such visual display means. Therefore, some devices have a sounding means that emits a sound when an abnormality is detected in order to enhance the alarm effect, but making a sound and displaying an alarm may be annoying to others depending on the time and place. Also, if the subject perceives the sound, it may come to support the shooting. Further, since it consumes more electric power than the light emitting diode, it is more preferable to provide means for appropriately muting the sound as necessary. However, if a switch as a sound deadening means is simply provided for that purpose, the number of operating members in the winding device increases, which causes problems such as complicated operation of the winding device, an increase in space, and an increase in cost. More importantly, if the mute switch is provided and, for example, the mute switch is turned off to prohibit the sounding operation of the sound indicating means, there is a possibility that the operation of turning the mute switch on may be forgotten. . In this case, even if the alarm sound generating means is provided, the function cannot be fully utilized, and as a result, it is impossible to take appropriate measures against the alarm.

(C) Purpose The present invention has been made in view of such circumstances, and first, when an abnormal state at film winding occurs due to a decrease in power supply voltage, film end, etc., an alarm is first issued by light emission. It is possible to issue a double-checking alarm that is issued and then an alarm by sounding after a lapse of a predetermined time. Moreover, after the alarm by light emission is issued, the drive mode and the stop mode are selectively switched. Associated with the switching device from the drive mode to the stop mode by the mode switching operation means for forcibly prohibiting the alarm by sounding, and the operation for canceling the forcible prohibition state of the sounding alarm is stopped by the mode switching operation means. By associating with the switching operation from the mode to the drive mode, it is possible to reliably prevent forgetting to cancel the forced prohibition state of the sound alert for the next shooting. An object is to provide an alarm device for an electric hoisting device.

(D) Configuration In order to achieve the above object, the present invention is an electric winding device that winds a film by a driving force of a motor, in which a drive mode for driving the motor and a stop mode for not driving the motor are manually operated. Mode switching operation means provided so as to be switched automatically, and abnormality detection means for detecting an abnormal state at the time of film winding caused by a decrease in power supply voltage and / or film end, and outputting an abnormality detection signal. An alarm light generating means for visually displaying an alarm upon receiving the abnormality detection signal from the abnormality detecting means, and a delay means for delaying and outputting the abnormality detection signal from the abnormality detecting means for a predetermined time; An alarm sound generating means for emitting an audible sound to display an alarm when the abnormality detection signal from the abnormality detecting means is received via a delay means; When the mode switching operation means is set to the drive mode, the alarm light generation means and the alarm sound generation means are held in an operable state, and the mode switching operation means stops from the drive mode. A warning sound muffling means provided in association with the mode switching operation means so that at least the warning sound generating means can be switched to the inoperative state when the mode is set to be switched. Is.

Hereinafter, the present invention will be described with reference to the embodiments shown in the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

In the figure, when the shutter front shutter curtain and shutter rear curtain travel due to shutter release and the exposure operation ends, a winding start signal generator B1 on the camera side outputs a winding start signal to the motor drive unit B2 on the winding device side. Then, the rotation of the motor M is started. At this time, the rotation time detection unit B3 receives the winding start signal and starts measuring time with, for example, a digital counter. The rotational force of the motor M is appropriately transmitted to the camera side via a reduction gear system and a coupler (not shown), and the film is wound by the motor. The rotational position detector B4 detects the relative position of the rotary member and the fixed member driven by the motor M, and outputs a film winding start signal and a film winding end signal, for example. The rotation time detection unit B3 stops counting the time starting from the time when the winding start signal is received by receiving the film winding end signal from the rotation position detection unit B4, and the count number or data corresponding to the time. An abnormality detection unit that is an abnormality detection means
Output to B5. This count number or data corresponds to the time from the input of the winding start signal from the camera side to the end of the winding of the film.

On the other hand, the winding position detection unit B6 discriminates whether the film is normally wound on the camera side or stopped in the middle, and the winding start signal output from the winding start signal generation unit B1 on the camera side is detected. The winding state is discriminated based on the signal. That is, the start signal generator
As B1, for example, a winding state detection switch (not shown) that is turned on when the exposure operation is completed to generate a winding start signal and is turned off when the film winding is completed to generate a winding end signal is provided on the camera side. In this case, the winding position detection unit B6 sequentially outputs the count value of the time starting from the time when the winding start signal output from the winding state detection switch is received, and the counting operation is performed by receiving the winding end signal. It is configured to stop and output to the abnormality detection unit B5 data according to the number of counts at the time of stopping or the time.

The abnormality detection unit B5 is a reference time setting unit that can preset the time required to wind the film assuming that the battery as a power source has dropped to a predetermined voltage as a reference time, and the reference time and the rotation time detection. The section B3 and the winding position detection section B6 have a comparison section that compares the values with the time values counted.

The abnormality detection unit B5 inputs the time data from the start of winding to the end of winding from the rotation time detection unit B3 and the winding position detection unit B6, respectively. Because. That is, in this example, when the film is finished (when the film is wound by the maximum number of frames to be photographed), the winding mechanism on the camera side is prevented from rotating, but the winding drive force transmission system on the winding device side is connected to the clutch mechanism. Alternatively, since a slip mechanism is provided, the film continues to rotate after the film is finished. Therefore, it is the winding position detection unit B6 that can detect that the film is finished,
In addition, it is possible to detect abnormal conditions such as a decrease in the power supply voltage and other mechanical problems of the hoisting device, especially when the hoisting device is not mounted on the camera.
This is the rotation time detection unit B3 that receives the signal of.

In the abnormality detection unit B5, when the comparison unit determines that the rotation time, which is the output signal from the rotation time detection unit B3, is longer than this reference time, the power supply voltage of the winding device is the minimum for winding the film. An alarm signal indicating that the voltage has dropped close to the required voltage (battery near end) is output to the pulse generator B7 and the mode detector B8. When the comparison unit determines that the time signal from the winding start time input from the winding position detection unit B6 is longer than the reference time, the abnormality detection unit B5 ends the film on the camera side (film end ) Similarly, an alarm signal indicating that the winding mechanism is blocked is output to the pulse generator B7 and the mode detector B8. Abnormality detection part B5
Further, when such an abnormality is detected, the alarm signal is output and a motor stop signal is output to the motor drive unit B2 to stop the rotation of the motor M.

The pulse generator B7 that received the alarm signal from the abnormality detector B5
A predetermined pulse is applied to the base of the transistor Tr1 and the base of the transistor Tr2 via the delay circuit B9. Transistor Tr1 is a light-emitting diode whose emitter is grounded and whose collector is connected to its power source.
Since the cathode side of the LED is connected via the resistor R1, the transistor from the pulse from the pulse generator B7
Tr1 is turned on / off, whereby the light emitting diode LED, which is an alarm light generating means, blinks and an alarm display is performed by light. The transistor Tr2 has an emitter grounded and a collector connected to a power source through a piezoelectric vibrator P which is an alarm sound generating means. A resistor R2 is connected in parallel with the piezoelectric vibrator P. The frequency of the generated sound is determined by the capacitance of the piezoelectric vibrator P and the resistance R2. The pulse from the pulse generator B7 is delayed by a delay circuit B9 as a delay unit for a predetermined time (about 2 seconds in this example) and applied to the base of the transistor Tr2 to turn on / off the transistor 7Tr2. As a result, the piezoelectric vibrator P emits an alarm sound that is an intermittent sound. On the other hand, the mode detection unit B8 is a mode switch SW state that can be selectively switched by a manual operation between a drive mode in which the winding device can wind the film and a stop mode in which the film winding operation is not performed. When it detects that the mode switch SW is set to the stop mode, it outputs a pulse generation prohibition signal that prohibits pulse generation to the pulse generator B7 and turns off the light emitting diode LED. At the same time, it is provided with an alarm sound silencer that silences the piezoelectric vibrator P and prohibits the alarm.

FIG. 2 is a timing chart showing an example of the alarm operation of the light emitting diode LED and the piezoelectric vibrator P when the alarm signal is issued from the abnormality detection unit B5. Unfortunately, in this embodiment, the light emitting diode LED is
7 4H _Z, 1/3 duty (where duty is equivalent to the ratio between the pulse of the high level and low level) performs flashing four times per second receive pulses. In addition, the piezoelectric vibrator P
May sound four times per second for two seconds Could emitting diode LED 2 seconds elapse after 4.14KH _Z flashing start of the delay circuit B9.
Although not shown in FIG. 1, since the pulse generator B7 is configured to output only 8 pulses to the delay circuit B9, sound generation is automatically stopped after 2 seconds have elapsed from the start of sound generation.

According to the above embodiment configured as described above, when the film is wound by the winding device, when the power supply voltage is lowered or when the film is finished and the film cannot be wound, the abnormality is detected. Since the rotation of the rotating member driven by the motor by the section B5 or the winding of the film is not completed within the predetermined time, it is determined that the LED is blinking because it is judged to be in an abnormal state,
It can be seen that there is a battery near end condition or a film end condition or other abnormal condition. Moreover, when a predetermined time has elapsed from the start of blinking the light emitting diode LED, an alarm sound is emitted from the piezoelectric vibrator P together with the blinking of the light emitting diode LED, so that the abnormal state can be more clearly known.

In addition, the mode switch SW as the mode switching operation means
Is a switch that selectively switches between a drive mode in which the hoisting device can be hoisted and a stop mode in which the hoisting device is not operated, and is essential for the hoisting device. If you want to stop the alarm sound, set this mode switch SW
Alternatively, the stop mode may be set after the alarm light is emitted. As described above, by using the mode switch SW together, it is not necessary to provide a special operation member such as a muffling switch for interrupting the alarm sound as in the conventional case, so that such an operation member is provided without increasing the cost. Since it is not necessary to secure a space for this, and the number of operating members is not increased, there is no fear that the operation of the winding device will be complicated. Moreover, since the mode switch SW will be set to the stop mode in almost all cases when an abnormal state occurs, it is not necessary to know that the abnormal state can be prohibited.

Further, since the sound is generated by the piezoelectric vibrator P after a lapse of a predetermined time after the light emitting diode LED blinks, it is possible to emit a sound, for example, for stage photography or quiet party photography. In the case of causing trouble to others or causing inconvenience in photographing, it is possible to prevent the sound generation by setting the mode switch SW to the stop mode within the predetermined time, thereby dealing with the inconvenience.

Further, even when the warning of these abnormal states is stopped, the mode switch SW is always switched to the drive mode at the next winding operation, so that the alarm can be surely issued. Therefore, there is no possibility that an abnormal state will occur due to forgetting to turn on the mute switch as in the case where the muffler switch is provided as in the prior art, for example.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

For example, the light emitting diode LED may remain lit without blinking when an abnormal condition is detected, or
The sound produced by the piezoelectric vibrator P may be continuous.

Further, the warning display by the light emitting diode LED may be a warning display without light emission by the liquid crystal. As for the alarm sound generating means, a sounding element other than the piezoelectric vibrator P can be used as long as it is small and does not consume power.

Further, as an abnormal state, in addition to the end of the film, the decrease of the power supply voltage, for example, the motor is not rotated due to a failure of a mechanism such as the motor or the driving force transmission system, or the case where the motor is rotated only at a low speed is detected. be able to. Further, in the case where the film is rewound by the motor M, if the rotational position detecting section B4 is attached to the rotating member that rotates during the film rewinding operation, the power supply voltage is increased even during the film rewinding. You can check.

Further, in the above embodiment, the case where the hoisting device is attached to the camera has been described. However, if a switch for issuing a test start signal similar to the hoisting start signal is provided on the hoisting device side, the hoisting device alone can control the power supply voltage. A check can be made, so that the film winding action can be done properly without actually taking the film (film winding is accompanied by film filming if the film is loaded in the camera). It is possible to predict whether or not.

In the above embodiment, the film winding speed or film winding time is determined by the rotation position detection unit B4 and the winding position detection unit.
Although detected by B3, the relative angular position of the member that rotates in a fixed relationship with the film winding mechanism on the camera side, that is, the motor changes the slip angle, but the film winding mechanism does not. If the rotation position detector B4 is provided on the rotating member that does not cause slippage, the winding position detector B6 can be omitted.

(E) Effects As will be apparent from the above detailed description, according to the present invention, first, the alarm light generating means issues a warning by emitting light, and after a predetermined time elapses, the alarm sound generating means issues a warning by sounding. It is possible to double check the abnormal state at the time of film winding caused by the drop of the power supply voltage and the end of the film because it is configured in addition, and further, if an alarm sound is emitted, it is inconvenient. In such a case, it is possible to forcibly prohibit the generation of the alarm sound by performing an operation of switching the drive mode to the stop mode by the mode switching operation means within a predetermined time after the alarm light is emitted. Since it is configured, it is possible to appropriately deal with the case where the above-mentioned inconvenience occurs.

In addition, the mode switching operation means originally provided on the camera side or the electric hoisting device side is also configured to be shared as the switch means for forcibly prohibiting the generation of the alarm sound, so that the next shooting can be performed. It was also possible to reliably prevent forgetting to cancel the forced prohibition state of the pronunciation alarm.

Further, with this configuration, it is possible to avoid complication of the configuration and complication of the operation, and to increase the space due to the special provision of the dedicated operation means for releasing the forced prohibition of the sounding alarm, Ancillary effects such as suppressing the increase in costs have also been obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention,
FIG. 2 is a timing chart showing an example of the alarm operation in the same embodiment. B1 ...... Winding start signal generator, B2 ...... Motor drive unit, B3 ...... Rotation time detection unit, B4 ...... Rotation position detection unit, B5 ...... Abnormality detection unit, B6 ...... Winding position detection unit, B7 ...... Pulse generator, B8 ... Mode detector, B9 ... Delay circuit, SW ... Mode switch, LED ... Light emitting diode, P ... Piezoelectric vibrator, Tr1, Tr2 ... Transistor, M ... Motor.

Front Page Continuation (72) Inventor Tomoya Kitajima 1-3-6 Nakamagome, Ota-ku, Tokyo Ricoh Co., Ltd. (72) Kenji Koyama 1-3-6 Nakamagome, Ota-ku, Tokyo Ricoh Co., Ltd. (72) Inventor Mikio Kobayashi 1-3-6 Nakamagome, Ota-ku, Tokyo Ricoh Co., Ltd. (72) Inventor Hiroshi Terui 109, Ohata, Hanamaki-shi, Iwate Prefecture Riko Optical Co., Ltd. ) References Actual development Sho 59-73729 (JP, U) Actual development Sho 58-47825 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An electric winding device for winding a film by a driving force of a motor, which is provided with a mode switch provided so as to manually switch a drive mode for driving the motor and a stop mode for not driving the motor. Operating means, abnormality detecting means for detecting an abnormal state at the time of film winding caused by a decrease in power supply voltage and / or film end, and outputting an abnormal detection signal, and the abnormality detecting signal from the abnormality detecting means In response to this, an alarm light generating means for visually displaying an alarm, a delay means for delaying and outputting the abnormality detection signal from the abnormality detection means for a predetermined time, and a delay means for outputting the abnormality detection signal from the abnormality detection means When the abnormality detection signal is received, an audible sound is emitted to display an alarm, and an alarm sound generating means and the mode switching operation means are set to the drive mode. When the alarm light generation means and the alarm sound generation means are kept operable, and when the mode switching operation means is set to switch from the drive mode to the stop mode, at least An alarm device for an electric hoisting device, comprising: an alarm sound muffling unit provided in association with the mode switching operation unit so that the alarm sound generating unit can be changed to an inoperative state.