JPS63221331A - Camera - Google Patents

Abstract

PURPOSE:To prevent slip between a feed roller and film by disposing the film feed roller behind a cartridge chamber and bending a film traveling path from the cartridge chamber to an aperture along the outer peripheral face of the film feed roller. CONSTITUTION:A roller disposition part for disposing the film feed roller 3 is provided behind the cartridge chamber 32 of a camera body 1 and the film feed roller 3 fixed to a revolving shaft 3a is disposed in this disposition part. The film traveling path of this camera is constituted to a nearly perpendicularly bent shape in such a manner that the film drawn out from a cartridge P in the cartridge chamber 32 toward the areas side of the camera is directionally changed nearly perpendicularly along the outside peripheral face of the film feed roller 3 and is then guided in parallel with the rear race of the camera. Since the contact length of the film and the roller 3 is long, large driving force is exerted to the film.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a camera, and more particularly to an easy-to-load film camera having a small overall width and excellent holding properties.

[Background of the Invention] In cameras that use roll film, the film loading operation is quite complicated. Therefore, proposals have been made for so-called easy loading cameras that can easily perform the film loading operation. Ta.

The present applicant also has the oldest accumulated technology in Japan regarding this technology, and has already made many proposals.

The easy-to-use film-loading camera that the applicant has already proposed is extremely easy to use, as it is configured so that film loading can be completed by simply inserting the cartridge into the cartridge chamber and closing the back cover. Although it is a camera, the following problems still remain in this previously proposed camera that should be improved.

(i) Since it is necessary to place a film feeding roller between the cartridge chamber and the aperture chamber, the distance between the cartridge chamber and the aperture chamber must be larger than that of a normal camera, so the overall width of the camera is larger. This causes the camera to become larger.

(jl) The film running path from the cartridge chamber to the aperture chamber is configured as a straight path, and the film running path is tangential to the outer circumferential surface of the film feeding roller, so that the film travels along the outer circumference of the film feeding roller. Only one point on the surface is contacted, so there is a risk of slippage between the film and the film transport roller.

[Object of the Invention] An object of the present invention is to solve the above-mentioned problems and provide an improved camera which has a small overall width and is free from the risk of slipping between the film and the film feeding roller. That's true.

[Summary of the Invention] In the camera improved by the present invention, the film running path from the cartridge chamber to the aperture is bent at at least one place, and the film feeding roller is disposed at the bent position, while the cartridge chamber is connected to the camera. It is characterized by protruding forward from the rear surface and being disposed close to the aperture side. Therefore, in the camera of the present invention, the length of contact between the film feed roller and the film is much longer than in the cameras already proposed by the applicant, so there is no risk of slipping between the film feed roller and the film. Furthermore, since the cartridge chamber is provided closer to the aperture side (that is, closer to the center of the camera), a camera that is smaller in width than previously proposed cameras can be realized.

[Embodiments of the Invention] In FIG. 1, 1 is a camera body, 2 is a front cover attached to the front side of the camera body 1, and 6 is a rear cover attached to the rear side of the camera body 1. A spool chamber 30 and an aperture chamber 31 are formed in the camera body 1, and a part of a partition wall constituting a cartridge chamber 32 is also formed. The front cover 2 has a curved portion 2a that forms a partition wall of the patrone chamber 32 together with the camera body 1, and a back cover 19 is pivotally attached to a bin 20 provided at the end of the curved portion 2a. . The cartridge chamber 32 opens toward the side surface of the camera, and the back i19 that closes the opening of the cartridge chamber 32 is pivoted on the front side of the camera and extends in a curved manner from the side surface of the camera to the rear surface of the camera. There is. The cartridge chamber 32 is arranged closer to the aperture side (that is, the center side of the camera) than conventionally known cameras, has an opening facing the side of the camera, and has a structure that protrudes further toward the front side of the camera than the spool chamber 30. It becomes. Therefore, in the camera of the present invention, the distance H from the center of the photographing lens 29 to the outer side of the cartridge chamber 32 is shorter than that of the camera already proposed by the present applicant, so that the width of the camera can be reduced. can prevent an increase in

The camera body 1 is provided with a roller arrangement section for arranging the film feeding roller 3 behind the cartridge M32.
A film feeding roller 3 fixed to a rotating shaft 3a is arranged in the roller arrangement portion.

In the camera of this embodiment, the film pulled out from the cartridge P in the cartridge chamber 32 toward the rear of the camera is turned approximately at right angles along the outer peripheral surface of the film feeding roller 3, and then parallel to the rear surface of the camera. As guided by
The film running path is curved at a substantially right angle. Therefore, since the length of contact between the film and the roller 3 is long, a large driving force can be applied to the film.

A protective glass 4 for protecting a photographic lens 29 is attached to the center of the front cover 2. The photographic lens 29 is fixed to a front plate unit 15, and the front plate unit 15 is supported by the camera body 1. .

The rear surface of the rear cover 6 is a plane that is perpendicular to the optical axis of the photographing lens at the rear of the camera, and shields the spool chamber 3o and the aperture M31 at the rear of the camera. Further, one end of the cover 6 is adapted to engage with and hang from the back cover 19 near one side edge of the aperture chamber 31.

The opening edge of the rear cover 6 is formed as a slope 6a that is oblique with respect to the rear surface of the rear cover 6, while the end surface of the free end of the back cover 19 opposite to the slope 6a is also formed as a slope with the same slope as the slope 6a. 19a, and when the back cover 19 is closed, a film passage 18 for empty rewinding is formed between the slope 6a and the slope 19a. Also,
A light shielding material 61 made of a soft and contractible material is attached to the slope 19a of the back cover 19, so that the part of the film leader that was exposed outside the camera when loading the cartridge is retracted into the camera. A light shielding material 61 blocks the passage 18 and prevents light from penetrating into the camera.

There is a recess on the back side of the slope 6a of the rear cover 6, and in the recess there is a detection switch 5 for detecting whether or not there is a film in the film passage 18 for empty rewinding and for detecting the leading edge of the film. is located. One contact piece of the detection switch 5 contacts the film when there is a film in the passage 18 and the switch 5 is turned off, and when the contact piece no longer contacts the film, the switch 5 is turned on.

On the inner surface of the back cover 19, there is a cartridge presser spring 26 for pressing the cartridge PftwJ loaded in the cartridge chamber 32 so as not to displace it, and a cartridge presser spring 26 arranged at a position facing the feeding roller 3 to press the cartridge PftwJ loaded in the cartridge chamber 32. film F between the
a first pinch roller 23 that pinches the pinch roller 23;
is rotatably supported, and one end is attached to the back cover 19 with a pin 2.
4, a pinch roller support plate 21 is pivotally mounted at the pinch roller support plate 21, and the pinch roller 23 is attached between the other end of the pinch roller support plate 21 and the inner surface of the back cover via the pinch roller support plate 21.
A spring 22 that applies pressure in the direction of the film surface, and a second pinch roller 25 that is disposed adjacent to the film path 18 for empty rewinding and that pinches the film F between it and the surface of the camera body 1 are provided. ing.

Further, the back cover 19 has a horizontally elongated opening through which the back cover opening/closing operation knob 27 is inserted, and a back cover opening/closing lever 28 shown in FIG. It is slidably mounted.

A transparent glass plate 7 is fixed to the opening of the aperture IC to form a film running surface and allows light to enter the film; 16 is a transparent glass plate arranged parallel to the glass plate 7; A pressure plate 1 forms a film running path at the rear cover 6 of the camera;
Reference numeral 5 denotes a sprocket that engages with a perforation hole in a film running between the cartridge chamber 32 and the spool chamber 30 and is rotated by the film. For details of the sprocket 55 and related structures, see FIG. I will refer to it and explain it later.

Reference numeral 8 denotes a spool for winding up a film provided in the spool chamber 1b, and a motor 9 for rotationally driving the fork and the spool 8 via a power transmission mechanism shown in FIG. 3 is accommodated in the spool 8. has been done.

Rollers 12 and 14 are arranged in the spool chamber 3o in contact with the outer circumferential surface of the spool 8 for winding the film in order to bring the film into pressure contact with the outer circumferential surface of the spool 8. One film roller 12 is rotatably supported at the tip of an elastic roller support plate 10 whose one end is screwed to the camera body 1. It is energized towards the direction. The other film roller 14 is rotatably supported at the tip of an elastic roller support plate 13 screwed to the inner surface of the rear cover 6 of the camera, and the elastic force of the roller support plate 13 causes the spool 8 to be It is pressed against the outer circumferential surface.

FIG. 2 is a perspective view of the back cover opening/closing lever 28 attached to the inner surface of the back cover 19 and related members. Back cover opening/closing lever 2
As shown in the figure, 8 is attached to the back cover 19 by stepped screws 57 and 58 screwed into the screw holes on the inner surface of the back cover 19.
is installed on. The stepped screws 57 and 58 are slidably inserted into the long holes 28b and 28c of the back cover opening/closing lever 28, and the back cover opening/closing lever 28 is inserted into the stepped screws in the longitudinal direction of the long holes 28b and 28c. It is supported by 57 and 58 and can be driven and hung.

59 is a spring that biases the back cover opening/closing lever 28 leftward in FIG. 2, and 60 is a locking pin fixed to the camera body 1.

When the back cover 19 is closed, the hook portion 28a of the back cover opening/closing lever 28 engages with the locking pin 60 as shown in FIG. 2, so that the lever 28 is locked to the locking pin 60. It has become. When opening the back M19, by manually moving the back cover opening/closing control knob 27 to the right, the hook part 28a and the locking pin 60 are disengaged and the back cover 19 can be opened.

FIG. 3 shows a power transmission mechanism for driving the feed roller 3, spool 8, and fork, and related members such as the motor 9 and sprocket 55 that supply power to the power transmission mechanism.

In FIG. 3, 8 is the spool, 8a is a spool gear formed integrally with the spool 8, 34 is a pinion fixed to the shaft of the motor 9, 38 is a sun gear, and 39 is centered around the shaft 40 of the sun gear 38. A planetary lever that can be rotated as
41 is a planetary gear rotatably supported at the tip of the planetary lever 39 and constantly engaged with the sun gear 38; 35 to 37;
42 is a reduction gear in which two large and small gears are integrally molded.
44 is a winding gear train for transmitting power to the spool 8, 46 to 49 is a rewinding gear train for transmitting rotation to the fork gear 50, and 51 is a fork that has entered the cartridge P and is suspended. It is.

The planetary gear 41 is attached to the planetary lever 39 with a predetermined frictional force, and the planetary gear 41 rotates when the load becomes larger than the frictional force. Further, the planetary lever 39 is also fitted onto the shaft 40 with a predetermined frictional force, and when the load becomes larger than the frictional force, only the shaft 40 rotates and the planetary lever 39 becomes unable to rotate.

The gear 43 has a collar 43a on one side thereof, and a notch 43b is formed in the collar 43a. The gear 44 has a shaft inserted into the collar 43a, and a coil spring 45 is fitted onto the shaft, and one end 45a of the coil spring 45 is locked in the notch 43b. Therefore,
The rotation of the gear 43 is transmitted to the coil spring 45 via one end 45a of the coil spring 45, and then transmitted from the coil spring 45 to the gear 44. Therefore, if there is a difference between the rotational speeds of gear 43 and gear 44, spring 45 is twisted, and the difference in rotational speed between both gears is absorbed as torsional energy of spring 45.

A pulley 42a is fixed to the gear 42, and an endless belt (toothed belt) 52 is wound around the pulley 42a and the pulley 33.

Reference numeral 53 denotes a disc that is integrally fixed to the sprocket 55 via a shaft 56, and a conductor pattern 53a for rotation detection is formed on the disc 53. A film feeding amount detection switch 54 having two contact pieces 54a and 54b in contact with the conductive pattern 53a is disposed close to the disk 53, and the detection switch 54 is configured as shown in FIG. Connected to the camera control circuit.

In FIG. 4, reference numeral 5 indicates the switch for detecting whether or not there is a film in the film path 18 for empty rewinding, as well as detecting the leading edge of the film, and 19A indicates the back cover 19.
62 is a switch that is turned off when the release button (not shown) is pressed;
3 is an exposure control circuit; 64 is a tension detection circuit that detects that the film is stretched between the cartridge and the spool when the final frame has been photographed; 65 is a rewind control circuit; and 66 is a tension detection circuit. Winding control circuit, 67 and 68
69 is a motor drive circuit consisting of a known transistor bridge circuit for controlling the supply current to the motor 9; 54 is an inverter that generates an output signal with a polarity opposite to that of the input signal; It's an on/off switch. The rewinding control circuit 65 and the winding control circuit 66 are activated when an "H" level (high level) input signal is input thereto, and the "L" level input signal is input thereto.
``When a low level input signal is input, it is converted to a non-operating state.

Further, the tension detection circuit 64 generates an output signal of "H" level when the film is in a tension state.

Next, the operations for loading film and photographing in the camera of this embodiment having the above-mentioned configuration and the operation of each part of the camera will be explained with reference to FIGS. 1 to 4.

When the back cover 19 is opened before loading the film, the switches 5, 19A, and 62 are all on, and the rewind control circuit 65 and the winding control circuit 66 are both inactive, and the motor is not output from both circuits. Since no control signal is applied to the drive circuit 69, the motor 9 is stopped.

When loading a film, the back cover 19 is opened and the cartridge is put into the cartridge chamber 32, and then the back cover 19 is closed while leaving the part F of the film leader protruding from the cartridge P exposed outside the camera. Then, when the back 119 is closed, the hook portion 28a of the back cover 19 engages with the locking pin 6o, and the back cover is locked. When the back cover 19 is closed, the switch 19A is opened, and the rewind control circuit 65 receives an H'' level (
A high level) input signal is input.

On the other hand, since the film ~ is present in the film path 18 for empty rewinding, the two contact pieces of the switch 5 are separated from each other by the film leader part F, so the switch 5 is also turned off, and therefore the rewinding control is also performed from the switch 5. In the circuit 65 “
A H'' level input signal is input.

When two 'H' level signals are input to the rewind control circuit 65 due to the opening of the switches 5 and 19A, the rewind control circuit 6
5 operates, a signal is applied from the chain rewinding control circuit 65 to the motor drive circuit 69, and the motor drive circuit 6
9 supplies the motor 9 with a current in the direction of arrow A in the figure. Therefore, the motor 9 is rotated in the film rewinding direction (reverse direction).

When the motor 9 starts rotating in the film rewinding direction, the sun gear 38 (FIG. 3) is rotated counterclockwise in FIG. The planetary gear 4 is rotated counterclockwise as shown in FIG.
1 is meshed with gear 46. When the planetary gear meshes with the gear 46, the load on the gear 46 is greater than the friction torque between the planetary lever 39 and the planetary gear 41, so the planetary gear 41 starts rotating, and the rotation of the motor 9 is caused by the rotation of the sun gear 38 and the planetary gear 41. is transmitted to gear 46 via. Therefore, the fork gear 50 is rotated via the gears 46 to 49, and the fork 51 in threaded engagement with the fork gear 50 descends in the axial direction, enters the cartridge, and is connected to the cartridge shaft. The cartridge shaft is also rotated by the rotation of 51. Therefore, the film is rewound into the cassette, and the film present in the film path 18 and the part of the film leader remaining outside the camera are rewound toward the cassette. , gear 42
does not mesh with the planetary gear 41, so the power of the motor 9 is not transmitted to the gear 42.

When the part F of the film leader exposed outside the camera is pulled into the camera and the tip of the part F of the film leader leaves contact with the contact piece of the switch 5, the contact piece contacts the other contact piece. The switch 5 is turned on and a 'L' level signal is applied to the rewinding control circuit 61 and the inverter 67, so that an 'H' level signal is applied from the inverter 6 to the winding control circuit 66. Rewind control circuit 6
As a result, the current supplied from the motor drive circuit 69 to the motor 9 is cut off, and the motor 9 is stopped.

On the other hand, since the human power signal of "H" level is applied from the inverter 67 to the hoisting control circuit 66, the hoisting control circuit 6
6 is activated, and after the motor 9 is stopped, a motor drive signal is applied from the winding control circuit 62 to the motor drive circuit 69. For this reason, the motor drive circuit 69
supplies a current in the direction of arrow B to the motor 9 in Fig. 4,
As a result, the motor 9 starts rotating in the film winding direction (normal rotation direction).

When the motor 9 rotates forward, the sun gear 38 shifts from gear 35 to
37 in a clockwise direction in FIG. Therefore,
First, the planetary lever 39 is rotated clockwise about the shaft 40 to disengage the planetary gear 41 from the gear 46, and then the planetary gear 41 meshes with the gear 42. The planetary gear 41 is then rotated by the sun gear 38 and the gear 42
is also rotated clockwise in FIG. 3 by gear 41. When the gear 42 rotates, the pulley 4 integrated with it
2a is also rotated clockwise, and the pulley 33 is also rotated clockwise via the belt 52. Therefore, the film feeding roller 3 is rotated clockwise in FIGS. 1 and 3, and the film leader part F is rotated between the roller 3 and '!'. J1
It is fed from right to left in FIG. 1 while being pinched by pinch rollers 23. As a result, part of the film leader F
After the tip of the film is inserted between the glass plate 7 and the pressure plate 16, the film travels along the film running path formed between the pressure plate 1B and the glass 17 toward the spool N30. When the film leader part F passes through the center of the aperture, the teeth of the sprocket 55 enter the perforation hole of the film, the sprocket 55 and the film are engaged, and the film then advances toward the spool N30. As the film rotates, the sprocket 55 is rotated by the film. When the sprocket 55 is rotated by the film, the conductor pattern 53a on the disk 53 also rotates, and the feed amount detection switch 54, which has contact pieces 54a and 54b in contact with the conductor pattern 53a, has a contact piece 54a and a contact piece 54b. An electrical pulse signal corresponding to the amount of film feeding is generated by turning on/off 54b. This electrical pulse signal is input to the rewind control circuit 66, where the film feed amount and film winding amount are calculated and stored.

Note that since the gear 42 is rotated, the gear 43 is also rotated, and the coil spring 45 is also rotated via the collar 43a and the spring end 45a, and the gear 4 coupled to the coil spring 45 is rotated.
Rotation is also transmitted to 4. For this reason, the spool gear 8a that meshes with the gear 44 is also rotated, and the spool gear 8a is rotated.
1 and 3, the spool 8 integral with the spool 8 is rotated clockwise in FIGS. 1 and 3.

When the tip of a part of the film leader enters the spool chamber 30, the tip is guided to the outer peripheral surface of the spool 8 by the roller support plate 13 in FIG. and is wound around the spool 8 by the roller 14. Spool 8
When the number of times the leading edge of the film is wound reaches a predetermined value, the winding control circuit 66 sends a signal to the motor drive circuit 6.
The signal applied to motor 9 is cut off, and as a result, motor drive circuit 69 cuts off the supply of current to motor 9 in the direction of arrow B, so motor 9 stops. As a result, the winding of the leading end of the film around the spool 8 is completed, and the loading of the film is completed.

When the photographer presses a release button (not shown) to take a picture, the switch 62 opens and the exposure control circuit 6
3 is operated, and an aperture mechanism and a shutter mechanism (not shown) are operated to take an image. - When the exposure is completed (that is, when the exposure is completed), an "exposure complete" signal is sent from the exposure control circuit 63 to the winding control circuit 66, and the winding control circuit 66 responds to this input signal to the motor drive circuit 69. A motor drive signal is applied to the motor drive circuit 69, and the motor drive circuit 69 supplies a current in the direction of arrow B to the motor 9 to rotate the motor 9 in the film winding direction. When the motor 9 is rotated in the film winding direction, the feeding roller 3 is rotated by the mechanism shown in FIG. 3, and the film is sent from the cartridge chamber side to the spool chamber side.
Sprocket 55 rotated by the film at that time
The switch 54 generates a pulse signal corresponding to the amount of film movement. This pulse signal is transmitted to the winding control circuit 66.
When the count value matches a predetermined value for advancing one frame of film, the motor drive signal applied from the winding control circuit 66 to the motor drive circuit 69 is cut off. Therefore, the film is 1
The motor 9 is stopped when the piece is sent.

When all frames of the film are exposed in this way and all the film that can be photographed is pulled out from the cartridge, an "H" level control signal is sent from the tension detection circuit 64 to the rewind control circuit 65 and the inverter 67. applied,
In response to this, an "L" level signal is applied from the inverter 67 to the winding control circuit 66, so that the winding control circuit 66
6 is converted to inoperative.・On the other hand, the tension detection circuit 6
In response to the input of the "H" level signal from 4, the first return control circuit 65 applies a motor drive signal to the motor drive circuit 69, and the motor drive circuit 69 supplies a current to the motor 9 in the direction of arrow A in the figure. supply Therefore, the motor 9 is rotated in the film rewinding direction, and after the fork 51 is inserted into the cartridge P by the mechanism shown in FIG. 3, the fork 51 is rotated in the film rewinding direction to perform film rewinding. After the film is rewound into the cartridge in this manner, the motor drive signal applied from the rewind control circuit 65 to the motor drive circuit 69 is cut off, and the motor 9 is stopped.

[Effects of the Invention] As explained above, in the camera of the present invention, the cartridge chamber can be projected forward beyond the spool chamber, and is disposed close to the aperture chamber, and the cartridge chamber is opened toward the side of the camera. On the other hand, a film feeding roller is arranged behind the cartridge chamber, and the film running path from the cartridge chamber to the aperture is bent along the outer circumferential surface of the film feeding roller, so that the width of the camera can be reduced. In addition, it is possible to increase the driving force for the film, and to prevent slip between the roller and the film.

Furthermore, since the front cover constituting the front partition of the cartridge chamber is configured to curve forward and protrude, a grip can be formed by the cartridge chamber, and as a result, the camera can be easily held. Can be done.

In the embodiments, the present invention was applied to a compact camera with a back cover that easily loaded film, but it is obvious that the present invention can be applied to other types of cameras as well.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional plan view of a simple film loading type camera to which the present invention is applied, Fig. 2 is an enlarged perspective view of the back cover opening/closing mechanism of the camera shown in Fig. 1, and Fig. 3 is installed in the camera shown in Fig. 1. FIG. 4 is a perspective view of the film feeding mechanism, and is a schematic diagram of a control circuit installed in the camera of FIG. 1. 1... Camera body 2... Front cover 3... Film feeding roller 4... Protective glass 5... Detection switch 6...
- Rear cover 7...Glass plate 8...Spool 9...Motors 10 and 13...Roller support plates 12 and 14...Roller 15 for winding the film...
Front plate unit 1B...Pressure plate 17...Spring 18...Film unwinding passage 19...Back cover 21...Pinch roller support plate 23...
・First pinch roller 25...Second pinch roller 26...Patrone pressing spring 27...Back cover opening/closing operation knob 28...Back cover opening/closing lever 29...Photographing lens 30
...Spool chamber 31...Aperture chamber 32.
... Patrone chamber 33 ... Pulley 38 ... Sun gear 39 ... Planet lever 41 ... Planet gear 50 ... Fork gear 51 ... Fork
52... Endless belt 55... Sprocket. Kotabe Tani [-Rei Figure 4

Claims (1)

[Claims] The cartridge chamber is arranged in front of the rear surface of the camera and close to the aperture chamber, and the cartridge chamber is opened toward the side of the camera, and a film feeding roller is arranged behind the cartridge chamber so that the cartridge can be opened from the cartridge chamber. A camera characterized in that a film running path leading to an aperture is bent along an outer peripheral surface of the film feeding roller.