JPH0486633A - Film feeding device for camera - Google Patents

Abstract

PURPOSE:To make a film leading edge smoothly get over the position of a roller member by providing a rotating amount detecting means, transmitting a driving force to the roller member through a gear train for a roller driving, and using the roller member as one of a film feeding means. CONSTITUTION:The roller member 23 arranged in such a way that one part of the roller member is advanced to the passing plane of the film 34 and being rotatable in a film feeding direction, and the gear trains 2, 3, and 8 - 12, and 21 for the roller driving which connect the roller member 23 and a motor 1 for the film driving are provided between a fork 20 and a film take-up spool 7. Furthermore, the rotating amount detecting means to detect the rotating amount of the roller member 23 is provided, the driving force is transmitted to the roller member 23 for making the film 34 surface press-contact to a magnetic head 48 through the gear trains 2, 3, and 8 - 12, and 21 for the roller driving, and the roller member 23 is made to be one of the film feeding means. Thus, the moving amount of the film can be transmitted while the ;film leading edge can get over the position of the roller member.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a fork that engages with a supply spool in an extrusion type film cartridge and extrudes or winds up the film, and a fork and a film feeding device. A camera equipped with a fork drive gear train that connects to a motor, a film take-up spool that winds film, and a spool drive gear train that connects the film take-up spool and a film feed motor. This invention relates to improvements to film feeding devices.

(Background of the Invention) Conventionally, in a camera film feeding device, when the leading end of the film protruding from the film cartridge (so-called leader part) is engaged with the sprocket or film take-up spool of the camera, the sprocket or Film was loaded by driving the film take-up spool. However, with this type of film, the leading edge of the film must be manually set, which is not only cumbersome, but if the leading edge of the film is set in the wrong position, the film may not be loaded properly, or the leading edge of the film may be pulled carelessly. This has the drawback of exposing the film to light and rendering it unusable.

Therefore, in recent years, the following new type of film cartridge has been proposed in US Pat. No. 4,834,306.

A film passing slit, a film fixed to a supply spool at one end and wound around the supply spool, and a regulating part regulating the radial expansion of the outermost periphery of the film arranged coaxially with the supply spool; a holding member that prevents the film from substantially contacting the inner wall of the film cartridge; a release portion that deforms a portion of the holding member to continuously release the outermost peripheral portion of the film from the radial restriction of the holding member; It is equipped with a guiding part that guides the part of the film released from regulation to the film passing slit, and prevents slipping between the outer periphery of the film and the holding member due to the expansion of the outermost periphery due to loosening of the film caused by rotation of the supply spool in the film extrusion direction. The drive force is applied to the film in the extrusion direction, thereby making it possible to extrude the film from the film cartridge. Hereinafter, this type of film cartridge in which the film can be ejected by rotating the supply spool will be referred to as a push-out film cartridge.

FIGS. 21 to 23 are views showing this extruded film cartridge, with FIG. 21 being a longitudinal cross-sectional view thereof, FIG. 22 being a cross-sectional view thereof, and FIG. 23 being a side view of the main parts.

In these figures, 301 is a film, 3゜2 is an extruded film cartridge, 303 is a film passing slit, 304 is a supply spool, and 304a is a film 30.
A fixing part for fixing one end of 1, 305 is a holding member, 305
a is a regulating portion, 3°6 is a release portion, and 307 is a guiding portion.

If this extrusion type film cartridge 302 is used, after loading into the camera, the supply spool 304 of the cartridge 302 is rotated by a fork, and the film 302 is
1 is ejected, the film 301 is pushed out until it is wound around the camera's film take-up spool, and then the film 301 is fed by the film take-up spool. Since there is no need to touch the tip, the drawbacks of the conventional method are eliminated.

In recent years, some films housed in this type of film cartridge are equipped with a magnetic storage section on which information can be written or read by a magnetic head. An example of this is a camera that uses a magnetic head to write shooting information such as shutter speed, aperture value, date, title, etc. into the magnetic storage section, or to read out film sensitivity, etc. that has already been written, and is patented in the United States. No. 4864332
Disclosed in the issue etc.

However, when a film provided with a magnetic storage section is used as a film to be housed in a push-out film cartridge as described above, for example, the following problems arise.

In other words, since information is stored in the magnetic storage section using a magnetic head during film feeding, a means of knowing the position (movement amount) of the film during film feeding is required. Traditionally, the following methods have been used:

1) Using a sprocket that meshes with the film perforations, the amount of film movement is determined by detecting the amount of rotation of the sprocket.

2) The amount of movement of the film is determined by pressing a roller member made of rubber or the like against the film and detecting the amount of rotation of the roller member.

3) The amount of film movement is determined by optically detecting film perforations using a photointerrupter or the like.

However, in the case of method 1) above, it is difficult to mesh the sprocket and perforation with a push-out film cartridge, and if the film hits the teeth of the sprocket, it can no longer be fed and the camera or film cartridge may be damaged. Or the film will run out.

In addition, in the case of method 2) above, in order for the roller member to press the film, a part of the roller member must be within the film passing surface (feeding locus), and the leading edge of the film must be within the film passing surface (feeding locus) when the film is wound. When it hits the roller member, it gets caught there, making it impossible to wind it up any further.

Further, in the case of the method 3), it is impossible to detect minute movements, and it is difficult to write or read information at an appropriate position.

(Objective of the Invention) The object of the present invention is to solve the above-mentioned problems and to provide a camera that allows the leading edge of the film to smoothly overcome the position of the roller member while making it possible to transmit a small amount of film movement. An object of the present invention is to provide a film feeding device.

(Features of the Invention) In order to achieve the above object, the present invention is arranged between a fork and a film take-up spool, a part of which enters the film passing surface, and is rotatable in the film feeding direction. a roller member, a roller drive gear train connecting the roller member and a film drive motor, and a rotation amount detection means for detecting the amount of rotation of the roller member; The present invention is characterized in that the driving force is transmitted to a roller member for pressing the film surface against the magnetic head through the magnetic head, and the roller member is used as one of the film feeding means.

(Embodiments of the Invention) Hereinafter, the present invention will be described in detail based on illustrated embodiments.

1 to 6 are diagrams showing a mechanical configuration according to an embodiment of the present invention, and FIG. 1 is a perspective view of a film feeding mechanism;
Fig. 2 is a plan view of the gear train during film winding, Fig. 3 is a plan view of the gear train during film rewinding, Fig. 4 is a vertical sectional view of the one-way clutch section, and Fig. 5 is a transverse sectional view thereof. FIG. 6 is a cross-sectional view of the main part of the camera.

In these figures, 1 is a film drive motor, which rotates in the normal direction (in the direction of arrow C in Figure 3) when winding the film.
When rewinding the film, it is reversed (in the direction of arrow C in FIG. 3).

2 is a pinion gear fixed to the rotating shaft of the motor 1. A first sun gear 3 meshes with the pinion gear 2. Reference numeral 4 denotes a first planetary gear, which meshes with the first sun gear 3. 5 connects the first sun gear 3 and the first planetary gear 4, and rotatably holds the first planetary gear while generating frictional force between the first planetary gear 4 and the first planetary gear 4; This is a first connection lever in which the rotation of the first sun gear 3 causes the first planetary gear 4 to revolve around the first sun gear 3 as the rotation center. The first sun gear 3, first planetary gear 4, and first connection lever 5 constitute a known planetary gear mechanism. 6
is a spool gear that meshes with the first planetary gear 4 only when the film drive motor 1 rotates normally. A film take-up spool 7 is fixed to the spool gear 6 and moves integrally with the spool gear 6.

8 is a first idler gear that always meshes with the first sun gear 3; 9 is a first two-stage gear that has a large gear portion 9a and a small gear portion 9b, and the large gear portion 9a meshes with the first idler gear 8; , 10 is a small gear portion 9b of the first two-stage gear 9
11 is a third idler gear that meshes with the second idler gear 10; 12 is a second sun gear that meshes with the third idler gear 11;
13 is a second planetary gear that meshes with the second sun gear 12. 14 is a third planetary gear, which, like the second planetary gear 13, meshes with the second sun gear. 15
The second sun gear 12, second planetary gear 13, and third planetary gear 14 are connected by arms 15a and 15b, respectively, and each planetary gear is held rotatably while generating frictional force. This is a second coupling lever in which the rotation of the second sun gear 12 causes the second planetary gear 13 and the third planetary gear 14 to revolve around the second sun gear 12 with the second sun gear 12 as the rotation center. The second sun gear 12 and the second and third sun gears
With the planetary gears 13, 14 and the second connecting lever 15,
It constitutes a known planetary gear mechanism.

16 is the fourth idler gear, which is connected to the film drive motor 1.
During normal rotation, the second sun gear 12 of the second coupling lever 15
When the motor 1 rotates in the left direction around , it engages with the second planetary gear 13 and does not engage with the third planetary gear 14. When the motor 1 rotates in reverse, the third coupling lever 15 rotates in the right direction. It is a gear that meshes with the planetary gear and does not mesh with the second planetary gear 13. 17 has a large gear part 17a and a small gear part 17b, and the large gear part 17a is connected to the fourth idler 1.
The second two-stage gear 18 meshes with the second two-stage gear 6, and the third two-stage gear 18 has a large gear part 18a and a small gear part 18b, and the large gear part 18a meshes with the small gear part 17b of the second two-stage gear 17. The gear 19 is a fork gear that meshes with the pinion 18b of the third two-stage gear 18, and the fork 20 rotates integrally with the fork gear 19. The supply spool is rotated to extrude and wind the film 34 from the cartridge 33.

21.22.29 (see Figure 4) is a one-way clutch, 21 is a gear that meshes with the second sun gear 12, 22
As shown in FIG. 5, a ratchet gear is formed with a full-circumference pawl portion 22a on the inside and a gear 22b on the outside; 29 is a ratchet pawl member having an elastic pawl portion 29b; The portion 29b is the pawl portion 22 of the ratchet gear 22.
It is engaged with a. When the relative speed of the ratchet pawl member 29 to the ratchet gear 22 occurs in the direction of the arrow (see Figure 2), the driving force is transmitted from the ratchet pawl member 29 to the ratchet gear 22, and the relative speed occurs in the direction of the arrow. In the opposite case, the pawl portion 29b is bent and slides on the pawl portion 22a, and the ratchet pawl member 29 does not transmit the driving force to the ratchet gear 22. Said ratchet pawl member 2
9 has a pin 29a as shown in FIG. 4, and since the pin 29a is fitted into the hole 21c of the gear 21, the ratchet pawl member 29 and the gear 21 always rotate together. 3o
4 is a base plate (not shown), and as shown in FIG.
29c and 22c are rotatably fitted. 2
3 is a roller member fixed to the ratchet gear 22, and the outer peripheral portion 23a has a structure such as rubber or knurling to prevent slipping.

24 is a pulse gear, and the gear portion 22 of the ratchet gear 22
meshes with b. A pulse plate 25 has a conductive part 25a and a non-conductive part 25b, and is fixed on the pulse gear 24. 26 and 27 are contact pieces, which connect the conductive portion 25 of the pulse plate 25.
This is a contact piece for detecting pulses corresponding to the amount of rotation of the roller member 23 using the non-conducting portion 25a and the non-conducting portion 25b.

Reference numeral 28 denotes a stopper (see FIG. 3) fixed to a base (not shown), which restricts the counterclockwise rotational position of the first connecting lever 5 by coming into contact with the end 5a of the first connecting lever 5. There are things.

31 is a main body (see FIG. 6), 32 is a pressure plate, 35 is a cartridge chamber, and 36 is a spool chamber. A magnetic head 48 is attached to the pressure plate 32.

The roller member 23 mentioned above is arranged as shown in FIG. 6, and in order to bring the magnetic storage part (not shown) provided in the film 34 into stable contact with (the magnetic gap part of) the magnetic head 48, It is attached in advance so that a certain predetermined pressure is applied to the magnetic head 48, or when the film 34 passes between the magnetic head 48 and the roller member 23,
The magnetic head 48 and the roller member 23 are arranged so that a predetermined pressure is applied to the magnetic head 48 depending on the thickness of the film 34.
It is installed with a gap between the As can be seen from the above, the roller member 23 constitutes one film feeding system, and rotates as the film 34 moves. The contact pieces 26 and 27 generate pulse signals.

In the above configuration, after the film cartridge 33 is loaded into the cartridge chamber 35, when the film drive motor 1 (pinion gear 2) is rotated in the direction of arrow B (normally rotated) as shown in FIG. The first sun gear 3 rotates clockwise, and the first planetary gear 4 revolves clockwise around the first sun gear 3 due to the action of the first coupling lever 5. Eventually, it meshes with the spool gear 6, the driving force of the film drive motor 1 is transmitted to the spool gear 6, and the film winding lisbourg 7 begins to rotate clockwise.

Further, the driving force is transmitted through an idler gear 8, which is another gear that meshes with the first sun gear 3, to a second gear through a first two-stage gear 9, a second idler gear 10, and a third idler gear 11. is transmitted to the sun gear 12. Therefore, since the second sun gear rotates counterclockwise, the action of the second coupling lever 15 causes the second planetary gear 13,
The third planetary gear 14 revolves counterclockwise around the second sun gear, and soon the second planetary gear 13 moves to the fourth planetary gear.
It comes to mesh with the idler gear 16 of. As a result, the driving force of the film driving motor 1 in the B direction is
The driving force is transmitted to the idler gear 16 as a counterclockwise driving force, and is further transmitted to the fork gear 19 via the second two-stage gear 17 and the third two-stage gear 18, so that the fork 20 rotates clockwise.

Furthermore, as the second sun gear rotates as described above, a driving force in the clockwise direction (in the direction of the arrow) is applied to the gear 21 that meshes with the second sun gear 12, so that the film is wound on the spool 7. Finally, gear 21. Ratchet gear 22. Due to the action of the one-way clutch composed of the ratchet pawl member 29, the one-way clutch rotates integrally (details will be described later), and accordingly, the roller member 2
3 will also rotate clockwise. As the ratchet gear 22 rotates, the pulse gear 24 that meshes with it also rotates, and the pulse plate 25 and contact pieces 27, 26 generate a pulse signal corresponding to the amount of rotation of the roller member 23, as shown in FIG. Encoder circuit shown in (described later)
The rotational speed and amount of rotation of the roller member 23 (feeding speed and amount of the film 34), etc. at that time are determined.

Here, the gear ratio of the gear train is configured as follows.

If the peripheral speed of the film take-up spool 7 is rVIJ, the peripheral speed of the roller member 23 is rV2J, and the speed of the film 34 pushed out from the film cartridge 33 by the fork 20 is "■3", then "■1>v2>V3". There is a relationship between

When the film 34 is pushed out from the film cartridge 33 by the clockwise rotation of the fork 20,
Since the roller member 23 is configured to constantly press the magnetic storage portion of the film 34 against the magnetic head 48,
The leading edge of the film contacts the roller member 23 and the magnetic head 48.

Here, according to the configuration of this embodiment, since the roller member 23 is rotating clockwise, the film 34 and the roller member 2
The frictional force of 3 allows the leading edge of the film to be smoothly fed from the cloth to the left in FIG. Moreover, since the rotational speed is configured as rV2>V3J, when the film 34 is fed out by the roller member 23 after this,
The driving force (speed) is transmitted through the film 34 to the fork gear 19, the third two-stage gear 18, the second two-stage gear 17, and the fourth idler gear 16 in this order, and then to the second planetary gear 1.
3 clockwise rotational speed than the fourth idler gear 16
The rotation speed in the counterclockwise direction becomes faster, but at this time, the fourth idler gear 16 jumps the second planetary gear 13,
The second planetary gear 13 and the fourth idler gear 16 are momentarily disengaged, and the speed difference is absorbed.

The film 34 is further fed out, and the film 34
When the film 34 is wound around the film take-up spool 7 by means of hooking the perforations of the main body or pressing the film 34 against the film take-up spool 7 provided on the main body side, due to the relationship rV 1>V2>V3J The roller member 23 is rotated by the frictional force with the film 34, and the roller member 23 rotates faster than the gear 21. However, due to the action of the one-way clutch mentioned above, the rotational force of the roller member 23 is rotated faster than the gear 21. I can't convey it to you. Also, at this time, the valve plate 25 and the contact pieces 26, 27
Based on the pulse signals generated, the feeding amount, speed, etc. of the film 34 can be determined by the encoder circuit shown in FIG. Furthermore, since the relationship rV 1 >V2J exists, the feeding speed changes greatly when the film 34 is wound around the film take-up spool 7, but by focusing on this speed change, it can be determined whether autoloading has finished or not. It is also possible to determine.

Next, the operation when rewinding the film will be explained.

To explain this operation with reference to FIG. 3, when the film drive motor 1 is rotated in the direction of arrow C, the first connecting lever 5 and the first planetary gear 4 are rotated counterclockwise around the first sun gear 3. direction until the end portion 5a of the first connecting lever 5 abuts against the stopper 28. Therefore, the first planetary gear 4 and the spool gear 6 are disengaged.

Also, at this time, the second sun gear 12 rotates clockwise,
As a result, the second planetary gear 13 and the third planetary gear 14 are connected to the second sun gear 12 by the action of the second connection lever 15.
The fourth idler gear 16 and the second planetary gear 13 are disengaged, and the fourth idler gear 16 and the third planetary gear 14 are engaged instead.

Therefore, the fork gear 19 rotates counterclockwise, and the fork 20 causes a supply spool (not shown) inside the film cartridge 33 to rotate in the opposite direction, so that the film 34 is wound into the cartridge 33.

At this time, the roller member 23 is rotated counterclockwise by the film 34, but the second sun gear 12
Since the speed at which the gear 21 is rotated counterclockwise is high, the relative speed of the gear 21 with respect to the ratchet gear 22 is counterclockwise (in the direction opposite to the direction of the arrow), so the one-way clutch mechanism rotates the gear 21 from the ratchet gear 22 No driving force is transmitted to.

As the film 34 is wound into the film cartridge 33 in this way, the leading edge of the film eventually passes through the roller member 23 and the roller member stops rotating, so there is no pulse between the pulse plate 25 and the contact piece 2627. After the signal is no longer generated and the film rewinding operation continues for a certain predetermined time, the motor is stopped and the film rewinding operation is completed (details will be described later).

The results of detecting the feeding amount and speed of the film 34 are used, for example, to synchronize with the magnetic head 48 during magnetic recording and to perform desired magnetic storage at a predetermined position in the magnetic storage section. Furthermore, it can also be used to control the feeding of one frame of film 34 and to write information using optical means such as LEDs.

Figures 7 and 8 are diagrams showing other configuration examples of the one-way clutch mechanism consisting of the aforementioned 21, 22, and 29. Figure 7 is for film winding, and Figure 8 is for film rewind. FIG. 2 is a plan view showing a gear train, respectively.

In these figures, 42 is a third sun gear that meshes with the second sun gear 12, and 43 is a fourth planetary gear that meshes with the third sun gear 42.

44 connects the third sun gear 42 and the fourth planetary gear 43, and when the third sun gear 42 rotates counterclockwise, the fourth planetary gear 43 connects the third sun gear 42. The third sun gear 42 revolves counterclockwise as the rotation center.
This is a third connecting lever that causes the fourth planetary gear 43 to revolve clockwise when rotated clockwise. 45 is a gear that meshes with the fourth planetary gear 43, and the roller member 2
3 are attached in two parts. Further, this gear 45 meshes with the pulse gear 24. 46 is a stopper that restricts the counterclockwise rotation of the third connecting lever 44.

As in the above embodiment, the circumferential speed of the film take-up spool 7 and the roller member 23 and the speed of the film 34 pushed out by the fork 20 are set as rVl>V2>V3J, so that the film 34 is When the film is wound onto the take-up spool 7, the gear 45 is moved clockwise via the roller member 23 to the third sun gear 42.
However, in this case, in order to flip the fourth planetary gear 43 in the direction of the arrow,
The speed difference is absorbed.

When rewinding the film, the third sun gear 42
Since the meshing between the planetary gear 43 and the gear 45 is released (
8), the film 34 is wound into the film cartridge 33 by the fork gear 19.

In addition, in FIG. 9, the film feeding amount is detected using the pulse plate 25 and contact pieces 26 and 27, but here, the pulse gear 24 is used to detect the film feed amount optically using a photointerrupter or the like. It shows.

In FIG. 9, 48 is a photointerrupter, 47 is a slit disk made of a light-shielding material, which is fixed to the pulse gear 24, and has a slit 47a formed therein.

In the above configuration, the photointerrupter 47 detects the slit 47a and generates a pulse signal according to the amount of rotation of the roller member 23.

Further, the shape and mounting position of the roller member 23 as a film pressing member are preferably as described below.

FIG. 10 is a cross-sectional view of the magnetic head 48 and the roller member 23, where 48a is the magnetic gap, 48b is the core, and 48c is the magnetic gap.
is the coil.

That is, in this embodiment, the film 34 is attached to the magnetic head 48.
Since the roller member 23 is configured to rotate even when the roller member 23 is not on the top, dust (shavings) generated at that time may enter the magnetic gap 48a of the magnetic head 48, or the magnetic gap 48a may cause friction. Since it may be stored away, it is preferable to use a shape as shown in FIG. 11, for example.

FIG. 11 is a diagram showing a longitudinal section, and 49 is a roller member, which consists of a large diameter part 49a and a small diameter part 49b, and the large diameter part 49a
The small diameter portion 49b is in contact with a portion other than the core 48b of the magnetic head 48 or the magnetic gap 48a provided at the tip thereof, that is, the magnetic gap 48a, the core 4
A portion facing 8b is a small diameter portion 49c to prevent direct contact between the roller member and the magnetic gap.

Further, as shown in FIG. 12, the roller member 50 is arranged so that the roller member 50 comes into contact with the magnetic gap 48a at a location other than the magnetic gap 48a.
0 and the magnetic gap 48a may be shifted by an interval.

Furthermore, if the installation is in the position shown in Figure 12 above,
As shown in FIG. 13, the roller member 5o is moved around the magnetic head 48 by an elastic means such as a spring so as to press the magnetic storage portion of the film 34 against the magnetic head 48 with a stable force.
It is desirable to apply force in eight directions.

In FIG. 13, 51 is a fourth coupling lever that is rotatable around the second sun gear 12 and that rotatably holds the gear 21 and engages the gear 21 and the second sun gear 12. It can operate completely independently of the second connection lever 15. 52 is attached at one end to the base plate (not shown) and at the other end to the fourth interlocking lever 51, and pushes the roller member 50, gear 21, etc. in the direction of arrow E, that is, the roller member 5o against the magnetic head 48 with a constant force. It is biased to attach.

FIG. 14 is an electrical block diagram according to an embodiment of the present invention.

In FIG. 14, 101 is a photometer for measuring the brightness of the subject to be photographed, and 102 is a distance measuring means for measuring the distance to the subject for focusing the photographic lens. A microcomputer (hereinafter referred to as microcomputer) 103 controls the operations of various circuits. 104 is a switch that is turned on in conjunction with the first stroke of the release button of a camera (not shown), and hereinafter this will be referred to as switch SW1.
It is written as 105 is a switch that is turned on in conjunction with the second stroke of the release button, and hereinafter this will be referred to as release switch SW2. 106 is a back cover switch that is linked to opening and closing of the back cover; 107 is a film cartridge 33;
This is a cartridge presence/absence switch whose state changes depending on whether or not the cartridge chamber 35 is loaded.

108 is the pulse plate 25 and contact piece 26.2 shown in FIG.
This is an encoder circuit that detects the pulse signal generated at 7, and detects the rotation speed and amount of rotation of the roller member 23 (film 3
It is used as information for determining the amount of feed (feed amount of 4), etc.

Reference numeral 109 denotes a motor control means for controlling the rotation of the film feeding motor 1, and as described above, film winding is reversed (rotation in the direction of arrow C in FIG. 3) by normal rotation of the motor 1 (rotation in the direction of arrow C in FIG. 3). C-direction rotation), film rewinding is performed. 110 is a shutter control means that controls exposure of the film. Reference numeral 111 denotes a lens control means, which controls the lens barrel based on information from the distance measuring means 102 so that the subject is in focus. 112 is the first
This head control means controls the writing or reading of information into a magnetic storage section (not shown) provided on the film 34 using the magnetic head 48 shown in FIG.

FIGS. 15 and 16 are flowcharts showing the operation of the microcomputer 103, and the operation will be explained below according to these.

"Step 1" It is determined whether the back cover of the camera is closed based on the state of the back cover switch 106, and when it is determined that the back cover is closed, the process proceeds to step 2.

"Step 2" The film cartridge 33 is inserted into the cartridge chamber 35 from the state of the cartridge presence/absence switch 1°7.
It is determined whether or not it has been loaded, and by determining that it has been loaded, the process proceeds to step 3.

"Step 3" Since the film cartridge 33 has been loaded, a winding start signal is sent to the motor control means 109 here. This causes the film drive motor 1 to switch to the first
As shown in FIG.
Extrusion from No. 3 is started.

"Step 4" By inputting a pulse signal corresponding to the rotation of the roller member 23 from the encoder circuit 108 and performing calculations with an internal clock signal, the roller member 23
Obtain the rotational speed V and acceleration v □ of .

t Here, if the count number of the pulse signal in a predetermined time is N, then the following equation is obtained. Alternatively, if the time interval between pulse signals is T, then the following equation is obtained.

"Step 5" It is determined whether or not the rotational acceleration of the roller member 23 obtained in step 4 above is changing rapidly. Determine that it has been rolled up and proceed to step 1
Go to 00.

Here, due to the sudden change in the rotational acceleration of the roller member 23, the film 34 is moved to the film take-up spool 7.
The reason why it is determined that it has been wound up will be explained below.

The relationship between the feeding speed of the film 34 and the rotational speed of the roller member 23 is shown in FIG.

In FIG. 17, after the film cartridge 33 is loaded, film winding (extrusion) is started at time To. The portion shown by a thin solid line is the rotational speed of the roller member 23, and the portion shown by a broken line is the moving speed of the leading end of the film during extrusion by the fork drive. In reality, there is some speed fluctuation due to load fluctuations, but this is not shown in the diagram as it can be ignored from the perspective of the whole.

The period from time T0 to T1 is the period of film extrusion,
A delay (T,') occurs in the start of movement due to the absorption of loose winding of the film 34 within the film cartridge 33. The period from time T1' to T1 is the period during which the fork 2o actually pushes out the film 34, and the rotational speed of the fork 2o determines the film feeding speed during this period. During this time, the roller member 23 rotates at a speed determined by the rotation of the film drive motor 1 and the gear ratio of the driving force transmission gear train up to the roller member 23.

The leading edge of the film reaches the roller member 23 at time T1, and thereafter the film 23 is drawn out according to the rotational speed of the roller member 23 until it reaches the film take-up spool 7. At this time, as mentioned above, the fork 20
The film extrusion drive will be invalidated.

The leading edge of the film is fed to the film take-up spool 7 from time T1 to T2, and the film 34 is wound around the film take-up spool 7 at time T2. That is, a sudden change in the speed of the roller member 23 means that the film 34 is wound around the film take-up spool 7 and begins to rotate at a speed according to the spool 7. Thereafter, the film is wound up to a predetermined position (the position where the first frame reaches the aperture portion) according to the rotational speed of the film take-up spool 7. At this time, the driving force of the roller member 23 also becomes invalid.

When the first frame reaches a predetermined position, the motor control means 109 stops winding the film, and at time T3, the film take-up spool 7 also stops. Further, when the shooting of the first frame is completed, winding of the film starts from time T4 toward the second frame.

Further, in this step 5, when the rotational speed of the roller member 23 is not changing rapidly, the process proceeds to step 6.

"Step 6" The rotational speed ■ of the roller member 23 is approximately "
If it is "O", it is determined that the leading end of the film is caught somewhere and the rotation of the motor 1 has stopped, and that the fork 2o and the roller member 23 are not rotating. Proceed to step 8. Further, if rotation of the roller member 23 is confirmed, the process proceeds to step 7.

"Step 7" It is determined whether or not a predetermined time ta has elapsed since the start of film winding. If the predetermined time ta has not been exceeded, the process returns to step 4. On the other hand, if no increase in the rotational speed of the roller member 23 due to the winding of the film around the film take-up spool 7 is detected even after the predetermined time ta has elapsed, the process proceeds to step 8. Note that the predetermined time ta is the first
This is a slightly longer time than the time interval between time To and time T2 in FIG. In other words, this is the time expected to be sufficient from the start of film extrusion until the film is wound around the film take-up spool 7. That is, if the predetermined time ta or longer is exceeded, it may be considered that autoloading has failed.

"Step 8" In order to try film winding (extrusion) again, the film 34 is temporarily moved to the film cartridge 33.
Begin the action of rolling inward. That is, the motor control means 1
09 to start rewinding the film. Then return to step 3.

Further, in step 5 above, if the rotational speed of the roller member 23 suddenly changes (state at time T2 in FIG. 17)
As described above, the process proceeds to step 100.

"Step 100" In order to read out information written in the magnetic storage section of the film 34, such as the prescribed number of films and film sensitivity, the magnetic head 48 is driven via the head control means 112 to start reading out the information.

"Step 9" The encoder circuit 108 detects the value of the pulse signal that is counted.

"Step 10" Here, the encoder circuit 108
Based on the count contents, it is determined whether the first frame has arrived at the aperture area or not, and the process continues in step 9 until the first frame reaches the aperture area.
Repeat step 10. When it is determined that the first frame has reached the aperture portion, the process proceeds to step 11.

"Step 11" Here, the drive of the film drive motor 1 is stopped via the motor control means 109, and the winding of the film is stopped.

When the above operations are completed, the flow advances to step 12 in FIG. 16.

"Step 12" Here, it is determined whether the first stroke of the release button has been made and the switch SWI has been turned on. The process proceeds to step 13 by determining whether the switch SWI is on.

"Step 13" Drive the photometric means 101 to measure the brightness of the subject (obtain photometric information).

"Step 14" The distance measuring means 102 is driven to calculate distance information (distance measurement information) to the subject.

"Step 15" Here, it is determined whether the second stroke of the release button has been made and the release switch SW2 has been turned on. If it is determined that the release switch SW2 is turned on, the process proceeds to step 17, and if it remains off, the process proceeds to step 16.

"Step 16" Here, as in step 12, it is determined whether the switch SW1 is on or not. If it is off, the process returns to step 12, and if it remains on, step 15 is determined.
The process returns to and waits for the release switch SW2 to be turned on.

"Step 17" Based on the ranging information obtained in step 14 above, the lens control means 111 is driven to move the photographing lens to the in-focus position.

"Step 18" Based on the photometric information obtained in step 13, the shutter control means 110 is driven to control exposure to the film 34.

"Step 19" In order to position the next frame in the aperture area, winding of the film is started via the motor control means 109 and the film drive motor 1.

"Step 20J: A pulse ° signal is input from the encoder circuit 108, and the rotation speed □ and rotation amount (film feeding amount) of the roller member 23 are calculated.

"Step 21" Determine whether the rotational speed of the roller member 23 obtained in step 20 above is approximately "0",
If it is not "0", that is, if the film is being wound, the process advances to step 22.

"Step 22" It is determined whether the count content in the encoder circuit 108 has reached the amount of feeding one frame of film. If not, the process returns to step 2o. If it is determined that the count in the encoder circuit 108 has reached one frame of film, the process proceeds to step 23.

"Step 23" The drive of the film drive motor 1 is stopped via the motor control means 109, and the winding of the film is stopped. Step 1 to prepare for the next shoot
Return to 2.

Further, in step 21, if the rotational speed of the roller member 23 is approximately "0", it is assumed that all frames have been photographed and the process proceeds to step 24.

"Step 24" The drive of the film drive motor 1 is stopped via the motor control means 109, and the winding of the film is stopped.

"Step 25" Here, in order to start rewinding the film (winding it into the film cartridge 33), the film drive motor 1 is driven in the direction of arrow C in FIG. 3 via the motor control means 109.

"Step 26" A pulse signal is input from the encoder circuit 108, and the rotational speed V of the roller member 23 is calculated.

"Step 27" It is determined whether the absolute value of the rotational speed υ of the roller member 23 obtained in the above step 26 is greater than "0", and if it is OJ, the process returns to the step 26 and the roller member 23 is again Calculate the rotation speed V of No. 23. Thereafter, if the rotation of the roller member 23 is detected to be larger than rOJ, the process proceeds to step 28.

The determination flow in step 27 is provided because if the film 34 wound around the film take-up spool 7 is loosened during initial rewinding, the roller member 2
3, because there is a delay in the movement of the film 34 being transmitted,
This is to avoid confusing this with the end of film rewinding.

"Step 28" A pulse signal is input from the encoder circuit 108, and the rotational speed υ of the roller member 23 is calculated.

"Step 29" Determine whether the rotation speed υ of the roller member 23 obtained in step 28 above is "0" or not, and if it is not rOJ, return to step 28 and repeat the same operation until it becomes "0". repeat.

Thereafter, if it is determined that the rotation speed υ of the roller member 23 is rOJ, that is, the rotation of the roller member 23 has stopped, it is assumed that the leading edge of the film has passed the position of the roller member 23, and the process proceeds to step 3o.

``Step 30J: Here, a timer that counts a predetermined time tc is started.

"Step 31" Film rewinding is stopped by confirming that the predetermined time tc has elapsed.

"Step 32" It is determined whether or not the film cartridge 33 has been taken out from the cartridge storage chamber 35 based on the state of the cartridge presence/absence switch 127. When it is determined that the film cartridge 33 has been taken out, the process returns to step 1 in FIG.

FIG. 18 is a diagram in which the rotational speed υ of the roller member 23 during film rewinding is shown as a solid line, and rewinding starts at time T5.
At time T6, the leading edge of the film has passed the position of the roller member 23, and in the case of the film rewinding direction, the roller member 23 immediately stops due to the friction with the opposing surface. The broken line is the moving speed of the leading edge of the film.

Fig. 19 shows that in step 5 of Fig. 15, it was determined whether autoloading was successful by looking at changes in acceleration, but as a modification of this, the judgment is made based on changes in average speed. It shows.

In FIG. 20, step 3' is provided between step 3 and step 4 in FIG. 15, and the output of the encoder 108 is not seen for a predetermined time td during which the drive of the film drive motor 1 will be stabilized. This is another example in which erroneous determinations due to changes in acceleration or speed of the film drive motor 1 at startup are avoided.

According to this embodiment, since the roller member 23 for bringing the film 34 and the magnetic head 48 into pressure contact is configured to be rotatable by the driving force of the film drive motor l, the leading edge of the film reaches the roller member 23. Since the film is then wound up according to this rotation, it is possible to eliminate the inconvenience that would occur if the film collided with the roller member 23 and the film could no longer be wound up. In addition, since the amount of film movement is detected from the amount of rotation of this roller member 23, it is possible to know the detailed amount of film movement, and it is possible to write and read information from an appropriate position. Become.

(Effects of the Invention) As explained above, according to the present invention, the film is disposed between the film and the film take-up spool, with a part of it entering the film passing surface, and is rotatable in the film feeding direction. a roller member, a roller drive gear train connecting the roller member and a film drive motor, and a rotation amount detection means for detecting the amount of rotation of the roller member; The driving force is transmitted to the roller member for pressing the film surface against the magnetic head through the magnetic head, and the roller member is used as one of the film feeding means, so that the fine movement amount of the film can be transmitted. The leading edge of the film can smoothly overcome the position of the roller member.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a film feeding device which is an embodiment of the present invention, Fig. 2 is a plan view showing a gear train when winding the film, and Fig. 3 is a plan view showing a gear train when rewinding the film. FIG. 4 is a longitudinal sectional view showing the one-way clutch mechanism shown in FIG. 1, FIG. 5 is a plan view showing the main part configuration of the one-way clutch mechanism shown in FIG. 1, and FIG. 6 is a diagram showing the implementation of the present invention. FIGS. 7 and 8 are plan views showing other examples of the roller member driving gear train, and FIG. 9 is a cross-sectional view showing the configuration of the main parts of the camera in which the example device is arranged. A vertical cross-sectional view showing another configuration, FIG.
FIG. 11 is a plan view showing the positional relationship between the illustrated magnetic head and the roller member, FIG. 11 is a longitudinal sectional view showing another positional relationship between the magnetic head and the roller member, and FIG. 12 is another positional relationship between the magnetic head and the roller member. 13 is a plan view showing an example of the configuration of the film feeding gear train in the case of the positional relationship shown in FIG. 12, FIG. 14 is an electrical block diagram according to an embodiment of the present invention, and FIG. 16 and 16 are flowcharts showing the same operation, FIG. 17 is a diagram showing the speed of the leading edge of the film and the roller member during autoloading, and FIG. 18 is a diagram showing the speed of the leading edge of the film and the roller member during film rewinding. Figures 19 and 20 are the first
21 is a longitudinal sectional view of the extrusion type film cartridge used in this embodiment, FIG. 22 is a cross sectional view thereof, and FIG.
The figure is also a side view. l...Film drive motor, 3...
First sun gear, 4...First planetary gear, 7.
...Film winding spool, 12...
Second sun gear, 13...Second planetary gear, 1
4...Third planetary gear, 19...Fork gear, 20...Fork, 22...
・Ratchet gear, 23...Roller member, 24
...Pulse gear, 25...Pulse plate,
25.26... Contact piece, 29... Ratchet claw member, 33... Extrusion type film cartridge, 34... Film, 42...・
Third sun gear, 43...Fourth planetary gear, 4
8... Magnetic head, 49.50... Roller member, 103... Microcomputer, 108...
... Encoder circuit, 109 ... Motor control means, 112 ... Head control means.

Claims (1)

[Claims] (1) A film feeding motor, a fork that engages with a supply spool in an extrusion type film cartridge and extrudes or winds the film, and a fork that connects the fork and the film feeding motor. A drive gear train, a film take-up spool for winding the film,
In a film feeding device for a camera comprising a spool driving gear train connecting the film winding spool and the film feeding motor, a film is provided between the fork and the film winding spool on a film passing surface. A roller member, a part of which is arranged so as to be able to rotate in the film feeding direction, a roller drive gear train that connects the roller member and the film drive motor, and detects the amount of rotation of the roller member. 1. A film feeding device for a camera, characterized in that a rotation amount detection means is provided.