JPH0719022B2 - Camera film feeder - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding device for a camera that performs a film winding and rewinding film feeding operation by driving a motor.

(Background of the Invention) In recent years, automation is rapidly progressing also in the field of cameras, and film winding and rewinding by a motor drive are widely performed.

Such a motor-driven film feeding device transmits a motor power transmission system that transmits motor rotation, a winding drive system that transmits rotation to a film winding spool, and further transmits rotation to a film rewinding fork. 3 with rewinding power transmission system
When the motor is rotated in the hoisting direction by the clutch mechanism using the planetary gear mechanism, the motor power transmission system is connected to the hoisting power transmission system to wind the film such as film feed or frame feed. On the other hand, when the shooting is completed, the motor power transmission system is connected to the rewinding power transmission system by the movement of the clutch mechanism by the motor rewinding rotation automatically or by the switch operation so that the film rewinding operation is performed. There is.

(Problems to be Solved by the Invention) However, in the conventional film feeding apparatus driven by such a motor, a new film cartridge is set on the rewinding shaft after the film rewinding is completed. Even when trying to pull out for loading, there was a problem that the rewind shaft on which the film cartridge was set did not rotate and the film could not be pulled out.

Therefore, when the film is loaded, the connection between the motor side and the rewinding power transmission system by the clutch mechanism is released to set the rewinding shaft in a free state. For example, the back cover of the camera must be opened to exchange the film. Is detected, the motor is rotated in the hoisting direction, the clutch mechanism is switched to the connected state with the hoisting power transmission system, and the clutch connection with the rewinding side is disengaged.

By the way, there are a sprocket drive system and a spool drive system in the winding power transmission system of the film feeding device.
In the sprocket drive method, a sprocket located in front of the winding spool is rotated by a drive source such as a motor to wind the film, and the winding spool has a slip clutch to secure the film tension with the sprocket. Is driven to rotate faster than the sprocket. On the other hand, in the spool drive system, the spool for film winding is rotationally driven by a motor or the like, but the sprocket is in a free state, and the sprocket is driven to rotate by the actual film movement by the winding spool. Further, in any of the drive systems, the film feed amount is detected from the number of rotations of the sprocket to perform frame feed or idle feed.

Therefore, in the sprocket drive system, when the motor is rotated in the winding direction to disengage the clutch from the winding upper side in the rewinding completed state where the film is not loaded,
Since the clutch is switched to the winding side and the sprocket is rotationally driven in the same manner as when the film is loaded, the motor rotation can be stopped by utilizing the detection signal of the film feed detection means based on this sprocket rotation. The applicant of the present application has proposed Japanese Patent Application No. 58-181815.

However, in the spool drive system, the sprocket cannot be rotated by the film,
Even if the clutch is switched to the upper side in the rewinding completed state with no film loaded, a film feed detection signal for motor stop based on sprocket rotation is obtained, so motor rotation for clutch disengagement is stopped. I can't
As a result, in the spool drive system, the film has to be pulled out from the cartridge in advance and loaded into the camera.

(Object of the Invention) The present invention has been made in view of such problems in the related art, and is intended for a film feeding apparatus having a spool drive type hoisting power transmission system, and is used for setting a film cartridge. The purpose is to make the return shaft free.

(Summary of the Invention) In order to achieve this object, the present invention provides a new film from the completion of the rewinding of the film without using the detection signal of the film feeding detection means which can detect the film feeding only when the film is actually loaded. The motor is wound up and stopped at a position where at least the clutch connection between the motor side and the film rewinding power transmission system is released based on a signal issued before the loading.

(Embodiment) FIG. 1 is an explanatory view showing an embodiment of a drive system used in the film feeding apparatus of the present invention.

First, the structure will be described. 1 is a film feeding motor, which is rotationally driven in either a rewinding direction indicated by an arrow A or a winding direction indicated by an arrow B. A gear 2 is connected to a rotation shaft of the motor 1, and a motor power transmission system 50 that decelerates the rotation of the motor 1 is configured by a gear connection mechanism including gears 2, 3a, 3b, 4a, 4b, 5a, and 5b. .

Reference numeral 6 denotes a rewinding fork provided at the end of the rewinding shaft for setting the film cartridge. A gear 10 is coaxially connected to the rewinding fork 6, and a gear 7 for transmitting power rotation to the rewinding fork 6. The rewinding power transmission system 60 is composed of 8a, 8b, 9 and 10.

Reference numeral 11 is a spool for winding the film. A spool drive shaft 12 is fitted in a shaft hole fitting portion 11a inside the spool 11, and a gear 16 is coaxial with the spool drive shaft 12.
And the gears 13, 14, 15 and 16 constitute a hoisting power transmission system 70.

Further, on the front side of the spool 11 for film winding, a sprocket shaft 17 having a sprocket 18 vertically arranged is arranged in a free rotation state, and the lower sprocket 18 was driven by the film feeding at the time of film loading. Switch mechanism 19 for detecting film feed from rotation of sprocket 18
Are arranged.

Reference numeral 80 denotes a clutch mechanism using a planetary gear mechanism, which is provided with power transmission according to the hoisting or rewinding rotation of the motor 1 to transmit power between the rewinding power transmission system 60 or the hoisting power transmission system 70. I try to connect and disconnect.

That is, the clutch mechanism 80 includes the gear 5b of the motor power transmission system 50.
Has a gear 20 meshed with the sun gear 21 coaxially with the gear 20.
, And the planet gear 22 is meshed with the sun gear 21. The planetary arm 25 is fitted into the shaft hole 24 of the planetary arm 25 below the rotary shaft 23 to which the sun gear 21 is fixed together with the gear 20, and the rotary shaft 23 can relatively rotate with respect to the axial hole 24 of the planetary arm 25 with a predetermined sliding resistance. It is fitted like. A fixed shaft 26 is established on the planetary arm 25, and the planetary gear 22 is rotatably attached to the tip of the fixed shaft 26.

Next, the film winding and film rewinding operations in the power transmission system of FIG. 1 will be described.

First, in the film winding drive such as the film idling or the frame advancing at the time of shooting, the motor 1 is rotationally driven in the direction of the arrow B indicated by the gear 2. The clutch mechanism 80 receives the hoisting rotation of the motor 1 through the motor power transmission system 50.
The gear 20 is driven to rotate clockwise. This gear
With the clockwise rotation of 20, the planetary arm 25 rotates clockwise due to the sliding resistance of the shaft hole 24 in which the rotary shaft 23 is fitted, and the planetary gear 22 at the tip of the rotary shaft 26 established in the planetary arm 25 Is the gear 13 located at the input stage of the hoisting power transmission system 70 as shown.
And the spool 11 is rotated counterclockwise through the gear mechanism of the winding power transmission system 70 to wind up the film in the loaded state. The sprocket 18 is conventionally rotated by the movement of the film due to the winding rotation of the spool 11, and the film feed amount can be detected from the number of times the switch mechanism 19 is turned on and off due to the rotation of the sprocket 18.

Next, in the film rewinding operation after the photographing is finished, the motor 1 is rotationally driven counterclockwise as indicated by the arrow A of the gear 2. By the rotation of the motor 1 in the rewinding direction, the gear 20 of the clutch mechanism 80 is rotationally driven in the counterclockwise direction via the motor power transmission system 50, and the sliding resistance of the rotating shaft 23 with respect to the shaft hole 24 is received to cause the planetary movement. The arm 25 is the rewinding power transmission system shown.
It moves counterclockwise from the state of switching to the 70 side, moves to the rewinding power transmission system 60 side, and the planetary gear 22 meshes with the gear 7 provided at the input stage of the rewinding power transmission system 60 as shown at 22 '. The rewinding fork 6 is rotated in the film rewinding direction via the rewinding power transmission system 60 to rewind the film whose influence on the film cartridge has been completed.

FIG. 2 shows an embodiment of a control circuit for performing motor control for disconnecting the clutch mechanism from the rewinding power transmission system when the rewinding is completed by using the power transmission system of the film feeding apparatus shown in FIG. It is a circuit block diagram.

In FIG. 2, reference numeral 30 denotes a rewinding setting circuit, which sets a film rewinding state by a known film end automatic detecting means or a manual setting means, and produces an H level output in the film rewinding state. The output of the rewind setting circuit 30 is an AND gate 32.
Is input to one side of the AND gate 32 and the other side of the resistor R
The rewinding completion detecting switch 34 biased by the power source voltage + Vcc is connected to the input via the input terminal, and the input of this switch becomes an inverting input. The rewind completion detection switch 34 closes the switch contact in the film loaded state where the film is wound around the spool 11, and opens the switch contact as shown when the film is removed from the spool and the film rewinding is completed. Therefore, in the film loaded state, the switch contact of the rewinding completion detection switch 34 is closed and one side of the AND gate 32 is provided with a switch output which becomes L level. However, since the input on this switch side is an inverting input, the AND gate 2 The switch input of is inverted to H level. At this time, if the rewind condition is set in the rewind setting circuit 30 and an H level output is obtained, the AND gate 32 outputs a rewind control signal to the H level to the motor drive circuit 36, and the motor drive circuit 36 is driven. 1 is rotated in the film rewinding direction. When the rewinding is completed, the switch 34 is opened to invert the output of the AND gate 32 to L level, and the drive circuit 36 receives this output and stops the rewinding rotation of the motor 1. As the rewinding completion detection switch 34 provided for setting the film rewinding condition, for example, a switch structure shown in FIG. 3 is used. That is, the pin 42 is attached to the tip of the switch lever 40 which is cantilevered as a spring member, and when the film 44 is loaded, the pin 42 is pushed in by the interposition of the film 44. The contact plate 46 is disposed to close the switch contact when the pin 42 is pushed by the film 44. When the film 44 is released from being pressed by the film 44 due to the completion of the film rewinding, the pin 42 of the contact plate 46 is returned to the protruding position by the switch lever 40 having a spring property.
The pressing by 42 is released and the switch contact opens.

The rewinding completion detecting switch 34 is not limited to the switch structure shown in FIG. 3, and an appropriate means for detecting the presence or absence of a film such as a photocoupler or a magnetic switch can be used.

Referring again to FIG. 2, 38 is a timer circuit for disconnecting the clutch connection with the winding power transmission system after the film rewinding is completed, and the timer circuit 38 is a film rewinding completion detection switch 34. When it is opened as shown in the figure, it is supplied with the power supply voltage + Vcc and is activated to generate an H level output, and the timer output is stopped after a predetermined set time has elapsed. The output of the timer circuit 38 is input to one of the AND gates 40, and the other end of the AND gate 40 is a rewinding completion detection switch.
34 outputs are input. For this reason, ANDGATE 40
Receives the H level output when the rewinding completion detection switch 34 detects the completion of the rewinding and opens as shown in the figure and the H level output of the timer 38 started upon completion of the rewinding, and sets the motor drive circuit 36 to the H level. The hoisting control signal is output, and the motor 1 is rotationally driven in the hoisting direction for the set time determined by the timer circuit 38.

The motor drive time in the hoisting direction for clutch disengagement after completion of rewinding determined by the set time of the timer circuit 38 is the same as that of the clutch mechanism 80 in the drive system shown in FIG.
The planetary gear 22 in the position indicated by 22 '
The time required to disengage the gear 7 from the gear 7 is set, and an appropriate time is set according to the amount of movement of the planetary arm 25.

Next, the film rewinding operation and the clutch disengaging operation after completion of the rewinding operation by the control circuit shown in FIG. 2 will be described.

Rewind setting circuit after shooting up to the last frame of the film is completed
When the rewind condition is set to 30, AND gate 32 is set to H
Level output is given. At this time, the rewind completion detection switch 34 closes the switch contact because the film is in the loaded state, and the input of the AND gate 32 is at L level.
Since this switch input is an inversion input, the AND gate 32 is in the permissible state with the film loaded, and when the H level output is made by setting the rewind condition by the rewind setting circuit 30, the AND gate 32 drives the motor. The H level output as the rewinding control signal is applied to the circuit 36. Therefore, the motor drive control circuit 36 drives the motor 1 to rotate in the rewinding direction indicated by the arrow A of the gear 2 as shown in FIG. 1, and winds the film wound on the spool 11 side into the film cartridge. return.

FIG. 4 shows the movement of the clutch mechanism of FIG. 1 in the film rewinding state.

When the film rewinding operation is completed by this film rewinding operation, the rewinding completion detection switch 34 opens the switch contact as shown in the drawing, and the signal level for the inverting input of the AND gate 32 becomes H level, and the AND gate 32 is The prohibition state is entered, and the rewinding rotation of the motor 1 by the motor drive circuit 36 is stopped.

As described above, when the rewinding of the film is completed and the rewinding completion detection switch 34 is opened, the power supply voltage + Vcc is supplied to the timer circuit 38 to start the timer circuit 38 and the AND gate 40 becomes the H level timer output. As a result, the two inputs of the AND gate 40 both become H level,
A hoisting control signal having an H level is output to the motor drive circuit 36, and the motor drive circuit 36 rotationally drives the motor 1 in the hoisting direction.

As a result, in the drive system shown in FIG. 1, the planetary gear 22 of the clutch mechanism 80, which meshes with the gear 7 of the rewinding power transmission system 60, is changed to the planetary arm by the rotation of the motor 1 in the winding direction indicated by the arrow B. The movement of 25 to the hoisting power transmission system 70 side causes gear 70
Is disengaged with the hoisting power transmission system from the motor 1 side.
The clutch disengaged state with 60 disengaged is obtained. The timer circuit 38 stops the timer output after a lapse of a certain time from the detection of the completion of the rewinding, and sets the timer output to the AND gate 40 to the L level to rotate the motor 1 in the winding direction.
To stop.

That is, as is apparent from the clutch portion of the power system which is taken out in plan view in FIG. 5, the planetary gear 22 which was at the position 22 'at the completion of the hoisting is the hoisting motor 38 for a certain time by the timer circuit 38. By driving in the direction, the clutch is disengaged, which is returned to a substantially intermediate position between the gear 7 of the rewinding power transmission system 60 and the gear 13 of the hoisting power transmission meter 70. After the winding is completed by disengaging the clutch, the rewinding fork 6 on the side of the rewinding power transmission system 60 for setting the film cartridge is set in the free state. Further, as shown in FIG. 5, when the clutch is disengaged at the neutral position, the winding power transmission system 7 side is also in a free state, so that the film is pulled out from the film cartridge set on the rewinding fork and the film is wound up. The position of the film insertion groove formed on the spool 11 can be freely adjusted. Further, in a spool of the type having no film insertion groove as the film winding spool 11, it is not necessary to align the film insertion groove, so the planet gear 22 of the clutch mechanism is shown in FIG. As described above, the timer time may be set such that the motor 1 is rotated in the hoisting direction until the gear 13 of the hoisting power transmission system 70 meshes with the gear 13 and then stopped.

In the above embodiment, the rewinding completion detection switch 34 detects the rewinding completion as the start signal for rotating the motor in the hoisting direction to release the connection between the motor power transmission system and the rewinding power transmission system. Although the signal generated occasionally is used, the present invention is not limited to this. Other examples include various operations performed to take out the filmed film cartridge that has been taken after rewinding, for example, unlocking operation of the locking device for opening the back cover, opening operation of the back cover, the film room of the filmed film cartridge. The starting signal may be generated by detecting a take-out operation from the device, a loading operation of a new film cartridge into the cartridge chamber, or the like. In short, the start signal may be generated based on the operation performed between the completion of rewinding and the loading of a new film cartridge into the cartridge chamber.

Further, in the above embodiment, the timer circuit 38 is used as a means for stopping the motor rotation in the hoisting direction performed for releasing the connection between the motor power transmission system and the rewinding power transmission system. It is not limited to this. For example,
Detecting that the clutch mechanism released the connection,
The motor rotation may be stopped using this detection signal. As a concrete example corresponding to the above embodiment, the planetary arm 25,
Detection of means for detecting that the shaft 26 and the gear 22 have oscillated and disconnected from the rewinding power transmission system (for example, a contact switch arranged in the movement locus of the arm 25, a photocoupler, etc.) It is possible to use a signal.

(Effects of the Invention) As described above, according to the present invention, the motor power transmission system, the hoisting power transmission system employing the spool drive system, and the rewinding power transmission system are provided, and the motor hoisting or rewinding rotation is performed. The completion of film rewinding was detected in the film feeding device of the camera which detects the film advance from the actual film movement at the time of film loading by switching the clutch according to At the same time, a clutch release mechanism is provided to disconnect the motor power transmission system from the rewind power transmission system by driving the motor in the reverse direction in the rewinding direction, so that the film patrone is automatically set when the rewinding is completed. The rewind fork connected to the system is in the free state, and when the film cartridge is newly set, the rewind fork is in the free state. Therefore, it is possible to easily pull out the film from the film cartridge for loading the film, and it is possible to eliminate the troublesome handling such as previously pulling out the film from the cartridge and loading it into the camera.

[Brief description of drawings]

FIG. 1 is an explanatory view of a drive system used in a feeding device of the present invention, FIG. 2 is a circuit block diagram showing an embodiment of a rewinding and clutch releasing control circuit in the present invention, and FIG. Explanatory diagram showing a specific example of the rewinding completion detection switch used in the figure,
FIGS. 4 and 5 are explanatory views showing rewinding and clutch disengagement of the clutch portion of the drive system. 1: Motor 6: Rewinding fork 11: Spool 12: Spool drive shaft 18: Sprocket 19: Switch mechanism 21: Sun gear 22: Planetary gear 23: Rotating shaft 24: Shaft hole 25: Planetary arm 26: Fixed shaft 30: Winding Rewind setting circuit 32, 40: AND gate 34: Rewind completion detection switch 36: Motor drive circuit 38: Timer circuit 40: Switch lever 42: Pin 44: Film 46: Contact plate 50: Motor power transmission system 60: Rewind power Transmission system 70: Hoisting power transmission system 80: Clutch mechanism

Claims (2)

[Claims] 1. A motor, a motor power transmission system for transmitting rotational power of the motor, a winding drive power transmission system adopting a spool drive system for transmitting rotational power to a film winding spool, and a film rewinding shaft. A rewinding power transmission system for transmitting rotational power to the motor, and a rewinding rotation of the motor for connecting the motor power transmission system to the hoisting power transmission system by a hoisting rotation of the motor A film rewinding device for a camera, comprising: a clutch mechanism that connects the motor power transmission system to a rewinding power transmission system; and a means for detecting film feed from film movement during film loading. A start signal generated between the completion and the loading of a new film cartridge into the cartridge chamber drives the motor in the reverse direction in the winding direction to drive the motor power by the clutch mechanism. A film feeding device for a camera, comprising a clutch releasing means for releasing a connection between a transmission system and a rewinding power transmission system. 2. The film feeding of a camera according to claim 1, wherein the clutch releasing means includes a timer circuit for instructing a motor reverse rotation for a predetermined time from when the completion of film rewinding is detected. apparatus.