JPH029329B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera with a built-in electric winder.

In recent years, cameras with built-in conductive winders have been put into practical use, but the most important consideration in such cameras is the balance between the performance of the winder and the operability of the camera. By the way, in order to improve the performance of the winder, it is necessary to increase the number of built-in batteries, and on the other hand, in order to improve the operation of the camera, it is necessary to make the camera itself compact, so the above two contradict each other. It has become a relationship. To solve this problem, we have adopted a removable auxiliary power supply.When shooting where operability is important, the camera's built-in power supply alone can drive the hoist, and when shooting where frame speed is important, It is also considered that by attaching an auxiliary power source to the camera, the auxiliary power source can also be used to drive the winding machine. If you do so, the following problems will occur.

That is, the problem is the unwinding speed of the wound film. In general, it is known that when the film is rewound beyond a certain speed, static electricity is generated between the film and the pressure plate, or between the film and the cartridge, and the resulting sparks increase the risk of the film being exposed to light. It is being For this reason, in the above-mentioned camera, when the auxiliary power supply device is attached, the voltage applied to the motor increases, so if the film is rewound in this state, the rewinding speed may be higher than necessary. However, it has the disadvantage that it becomes faster and causes the above-mentioned inconveniences.

On the other hand, there are situations in which speedy rewinding is not as strongly required as compared to winding.

The present invention has been made in view of these circumstances, and has a detachable auxiliary power supply, and in the case of shooting where operability is important, the winding machine can be driven only by the power supply built into the camera, and the frame speed can be increased. For shooting where emphasis is placed on film winding, an auxiliary power supply can be attached to the camera to increase the voltage applied to the film winder motor.For cameras with a built-in electric winder, it is possible to remove the film with the auxiliary power supply attached. When rewinding, the voltage applied to the motor during rewinding is configured to be lower than the voltage applied to the motor during winding, and rewinding is performed at a predetermined speed or lower. This is intended to prevent the film from being exposed to light due to static electricity.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.

In FIG. 1, symbol M is a motor. A motor pinion 1 that rotates counterclockwise is provided at the top of the motor M, and this rotation is transmitted through reduction gears 2 and 3, and is a switching device that can swing freely around the rotation axis of the reduction gear 3. The signal is transmitted to the idle gear 4 provided on the table 6.

This idle gear 4 meshes with a sprocket gear 5 that operates a winding mechanism (not shown) when winding a film, and when a rewinding operation is performed, a transmission fixed to the upper end of a first transmission shaft 7 is engaged by a mechanism to be described later. It is configured to mesh with gear 7a. A transmission gear 7b is also fixed to the lower end of the first transmission shaft 7, and a transmission gear 7b is fixed to the lower end of the second transmission shaft 9 via a timing belt 8 which is geared to prevent rotation of the first transmission shaft 7. Rewinding gear 1 transmitting to gear 9a and thereby meshing with transmission gear 9b
0 and operates the rewind fork 10b to rewind the film. Further, a pin 6a is provided at the end of the switching table 6 described above.
is provided upright on this pin 6a, and when the switching lever 11 is rotated in the direction of the arrow about the fulcrum 11a while resisting the spring 21, the pin 6a rotates about the fulcrum 11a in the same way as the switching lever 11 and rotates. One end is switching lever 1
The other end of the absorption spring 12, which is locked to the spring 1, is in contact with the other end of the absorption spring 12. Further, this switching lever 11 has a fulcrum 13.
The rewind changeover switch SW 3 is operated by the switch changeover shaft 13b, in which the pin 11b is erected so as to come into contact with the tip 13b of the switch changeover lever 13, and the changeover lever 11 is rotated in the direction of the arrow _. The contact point is turned ON and the tip of the absorption lever 15 is pressed.

Next, symbol 16 is an auxiliary power supply device. Pins 16a and 16b are provided at the upper end of this auxiliary power supply device 16, and the tip of the pin 16a is formed into a tapered shape. When this auxiliary power supply device 16 is attached to the camera body as shown in FIG.
The power supply switching lever 1 is connected by the tapered surface of the pin 16a.
4 is rotated about the fulcrum 14a against the spring 22, and the end of the power switching lever 14 switches the contact of the auxiliary power switching switch SW ₄ , and the absorption spring 15, which rotates together with the power switching lever 14, The tip is configured to switch the contacts of the power changeover switch _SW6 . In addition, the auxiliary power supply device 1
The 6 pins 16a and 16b may also serve as power supply terminals. Further, in FIG. 3, after the shutter runs on the sprocket 17 for winding the film, the trailing curtain signal lever 19 moves in the direction of the arrow, and the approximately T-shaped winding completion lever 20 moves counterclockwise around the fulcrum 20a. When the film is rotated, the approximately semicircular tip of the winding completion lever 20 disengages from the groove provided at the bottom of the sprocket 17, allowing the film to be wound. Then, the contact point of the sprocket rotation detection switch _SW2 is temporarily held by the protrusion provided at the upper part every time the sprocket rotates.

Further, a pin is provided upright at the other end of the winding completion lever 20, and is configured to maintain the contact point of the winding completion switch _SW5 in the ON state in response to the operation of the winding completion lever 20. Incidentally, reference numeral 18 is a sheet number set button, and when this button is pressed, the contact point of the film number set switch _SW1 is actuated to set the number of stored films.

Next, FIG. 4 is a circuit diagram for controlling the operation of the electric hoist.

In this figure, a counter 101 is used to set the number of stored films, and counts by inputting an L level signal each time the number set button 18 is pressed and the film number set switch _SW1 is turned on. Further, the up-down counter 102 is for counting the number of sheets of film that has been wound up. Sprocket rotation detection switch that operates every time sprocket 17 rotates once.
Input the L level signal from SW ₂ and count. Output terminal groups A, B, C, D of these counters 101 and output terminal groups A,
B, C, and D are the first signals of the comparator 103, respectively.
Input end groups A ₁ , A ₂ , A ₃ , A ₄ and second input end group
B ₁ , B ₂ , B ₃ , and B ₄ , and when they match, that is, when the number of stored films and the number of wound films match, the comparator 103 sends L to the AND gate 105 via the inverter 110 .
Outputs level signal. For this reason, the winding operation is performed without being detected by the comparator 103, and after the shutter travels, the winding completion lever 20 rotates as shown in FIG. 3, thereby starting the winding operation. That is, as a result of this rotation, the winding completion switch SW ₅ is turned on, so that an H level signal is input to the AND gate 105 via the inverter 108, and an inverter is input from the RC time setting circuit 112 forming a safety timer. The signal output through 111 also lasts for a certain period of time after the winding completion switch _SW5 is switched (this time is set to be somewhat longer than the time required for the film winder to wind one frame of film). Since the H level is maintained, as a result, an H level signal is output from AND gate 105, and similarly, OR gate 1 is output.
Since an H level signal is also output from 06, the transistor Tr becomes conductive and the motor M rotates. As a result, the sprocket 17 starts winding the film, and in the middle of the rotation, the sprocket rotation detection switch _SW2 is actuated to cause the up-down counter 102 to add and count the number of shots. Further, when the winding completion lever 20 is again engaged with the groove of the sprocket 17, the winding completion switch SW ₅ is turned OFF again.
Since the output of the inverter 108 becomes an L level signal, the driving of the motor is stopped. Similarly, when the number of stored films matches the number of shots taken,
Since the output of the comparator 103 provides an L level to the AND gate 105 via the inverter 110, the driving of the motor is also stopped in this case. However, if the number of sheets is set incorrectly when storing the film, the automatic stop function as described above cannot be expected, so the RC time constant circuit 112 starts operating from the time the winding completion switch SW ₅ is turned on. To prevent perforation breakage at the end of the film by giving an L level output to the AND gate 105 via the inverter 111 after a set time somewhat longer than the time required to wind one frame of the film. Stop the motor drive. By the way, as mentioned above, the frame speed changes when the motor is driven by the power supply P built into the camera body and when the motor is also driven by the auxiliary power supply P', so the RC timing circuit 112, that is, the safety It is necessary to change the operating time of the timer. Therefore, in the present invention, when the auxiliary power supply device 16 is attached to the camera body as shown in FIG.
4 to switch the auxiliary power detection switch SW ₄ to RC.
In order to change the time constant in the time constant circuit to a value corresponding to the frame speed when using the auxiliary power supply, the resistor 112a,
Select 112b. Also, at this time, the power source changeover switch _SW6 is switched to the terminal side of the auxiliary power source P' by the tip of the absorption spring 15 which is interlocked with the rotation of the power source changeover switch 14.

Next, the rewinding operation will be explained. When the rewind switching lever 11 is moved from the position shown in FIG. ₁ to the position shown in FIG. is pressed and rotates clockwise. For this reason, the power selector switch
SW ₆ is switched to contact the ground terminal even if the auxiliary power supply P' is attached. By the way, depending on the ON state of changeover switch SW ₃ ,
An H level signal is sent to the AND gate 104 via the inverter 109, but at this time, the OR gate 107 inputting the output signal from each output terminal of the up-down counter 102 indicates that the count content of the up-down counter 102 is "0". Therefore, an H level signal is output. Therefore, the AND gate 104 outputs an H level signal, and the OR gate 10
The motor M is driven by making the transistor Tr conductive through the transistor 6. Furthermore, at this time, the output of the sprocket rotation detection switch _SW2 , which is activated by the rotation of the sprocket 17, is output from the up-down counter 1.
02 is subtracted and the up-down counter 10
When the count content of 2 becomes "0", OR gate 1
When the output of 07 becomes an L level signal, the driving of the motor M is stopped. Further, when switching the rewind switching lever 11 in this way, the idle gear 4 is disengaged from the sprocket gear 5 and moves to mesh with the transmission gear 7a, but this movement is caused by the operation of the rewind switching lever 11. Since this is done via the absorption spring 12 which is interlocked with, it can be done easily.

As described in detail above, according to the present invention, when rewinding is performed using the built-in motor with the auxiliary power supply device attached to the camera, even if the auxiliary power supply device is attached, there is a difference in speed compared to when winding the camera. Since the voltage supplied to the built-in motor that serves as the drive source for rewinding is lowered so that the rewinding speed is lower than the specified rewinding speed, the rewinding speed becomes high and the connection between the film and the pressure plate or between the film and the cartridge is reduced. It is possible to completely prevent the film from being exposed to light due to static electricity generated between the two.

[Brief explanation of drawings]

Figure 1 is a perspective view of the main parts of the electric winding machine without an auxiliary power source, Figure 2 is a perspective view of the main parts of the electric winding machine with the auxiliary power supply installed, and Figure 3 is the main parts of the sprocket. A partial perspective view and FIG. 4 are circuit diagrams. M...Motor, 6...Switching stand, 11...Rewinding switching lever, 13b...Switch switching shaft, 1
4...Power switching lever, 16...Auxiliary power supply device,
16a, 16b...Pin, SW ₄ ...Auxiliary power supply detection switch, SW ₆ ...Power selection switch, 112
...RC timer circuit forming the safety timer, P'...
...Auxiliary power supply.

Claims (1)

[Claims] 1. A camera with a built-in electric winder, which is detachable from a camera body that performs electric winding and rewinding using at least one built-in motor as a drive source, and has an auxiliary power supply device that supplies power to the camera body, When the auxiliary power supply device is attached to the camera body, the voltage supplied to the built-in motor during electric winding is set to be higher, and the voltage supplied to the built-in motor during electric winding is set to be higher than that during electric winding. A camera with a built-in electric hoist, characterized by being equipped with a voltage control circuit that sets the supply voltage to a low level.