JPH10177215A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change the gap of a film gate in accordance with a blownie-sized film even after closing a back cover and winding the film. SOLUTION: A pressure plate 34 is supported on a back cover 10 so as to be freely moved between a position of coming into contact with a pressure plate receiving surface and a position of retreating toward the back cover 10. On the outer part of the back cover 10, a switching knob 33 which is selectively operated in accordance of the film type is installed. In the case of selectively operating the switching knob 33, a slide plate 41 is moved behind the pressure plate 34 and between a position where pin members 48 are pushed into opening 47 installed at four corners of the pressure plate 42 through a pressing surface 56 and a position where the pin members 48 are retreated from the openings 47 through a recessed surface 57. When the pin members 48 retreat from the openings, the pressure plate 34 comes into contact with the pressure plate receiving surface, and a tunnel gap is made narrower, on the other hand, in the case the pin members 48 are pushed into the openings 47, the pin members 48 come into contact with the pressure plate receiving surface, then, the pressure plate 34 is retreated toward the back cover 10, then, the tunnel gap is enlarged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera using a photographic film having a different thickness depending on the presence or absence of a backing paper. More particularly, the present invention relates to a film gate for a 120-roll film and a 220-roll film. And a camera that changes the gap.

[0002]

2. Description of the Related Art Brownie-size roll films are:
Since it does not have a cartridge (patrone), it is commercially available wrapped in a roll on light-shielding backing paper. Both types have the same film width, but the 120-roll film uses a backing paper longer than the film, and the film is applied in the area of the backing paper between the leader paper and the trailer paper. The 220 roll film has a form in which a backing paper of a leader paper and a trailer paper are attached only to the leading end side and the trailing end side of the film, respectively. Therefore, when the roll film is set on the aperture of the camera, the thickness of the 120 roll film is larger than that of the 220 roll film by the amount of the backing paper. Therefore, in order to align the film emulsion surface to the correct focus position, the gap between the tunnels is increased when using a 120 roll film, and the gap between the tunnels is reduced when using a 220 roll film. A mechanism for changing the gap of the tunnel is used for a film that becomes thicker when the film is provided with a film.

[0003] As a mechanism for switching the gap in the tunnel, for example, in the case of New Mamiya 6 (trade name of Mamiya P Co., Ltd.), a back plate is opened and a pressure plate provided inside the back cover is 90 mm.
By turning the pressure plate, the pressure plate moves back and forth, and when set at the position for the 220 roll film, the pressure plate comes into contact with the pressure plate receiving surface, and when set for the 120 roll film, the pressure plate moves from the pressure plate receiving surface. Leave a little. In the case of the Fuji GSW680III Professional (trade name) provided by the present applicant, the back cover is opened, the pressure plate of the back cover is once removed, the front and back surfaces of the pressure plate are replaced, and the tunnel is mounted in the same manner as described above. The gap changes. Further, in the case of Fujifilm GA645 Professional (trade name) provided by the present applicant, the back cover is opened, and the pressure plate is slid along the film feeding direction while being pressed toward the back cover side. The gap in the tunnel changes as you did.

[0004]

As described above, in any camera using a brownie-sized roll film, the operation of switching the gap in the tunnel is required unless the back cover is opened and the pressure plate inside the back cover is exposed. Can not do.
Therefore, there is a disadvantage that the position of the pressure plate cannot be easily corrected even if it is found that the switching position of the pressure plate is not correct after the film is loaded, the back cover is closed, and the film is wound up. If the switching position of the pressure plate is improper, problems such as poor focus and scratching of the film occur.

[0005] Further, a general 220 roll film is 1 roll.
Since the number of shots is larger than that of the 20-roll film, when the pressure plate is set at the switching position for the 220 film, the interlocking range of the film counter is expanded. If the switching position of the pressure plate is incorrect in such a camera, it is not possible to shoot all of the shot frames,
Inconveniences such as that the film cannot be wound up to the end occur.

The present invention has been made in view of such a background, and provides a camera capable of correcting the position of a pressure plate even after a film is loaded, a back cover is closed, and the film is wound up. With the goal.

[0007]

According to a first aspect of the present invention, there is provided a camera according to the first aspect, wherein the thickness of the photographic film is such that there is no backing paper between the photographic film and a film rail formed on the camera body. Between the first position contacting the pressure plate receiving surface and the second position spaced a certain distance from the pressure plate receiving surface toward the back cover side. Holding means for movably holding the pressure plate; a pressure plate spring provided between the pressure plate and the back cover for urging the pressure plate in a direction in which the pressure plate comes into contact with the pressure plate receiving surface; An external operating member that is selectively operated in accordance with the presence or absence of paper; and the first position using the urging force of a pressure plate spring in conjunction with selecting and operating the external operating member for a film without backing paper. And select it for the film with backing paper. It is obtained by a pressure plate moving means for allowing the movement to the second position of the pressure plate against the biasing force of the pressure plate spring in conjunction particular.

In the camera according to the present invention, a plurality of pin members are provided on the pressure plate so as to be able to freely enter and exit from the back cover side toward the pressure plate receiving surface, and the pressure plate spring is provided between the pressure plate spring and the pressure plate spring. A position in which the pin member is moved to the second position by pushing the pin member by using the force to abut the tip of the pin against the pressure plate receiving surface, and the pin member is pushed by using the urging force of the pressure plate spring to push the pin member into the pressure plate. And a movable plate that moves in conjunction with the operation of the external operation member between the first position and the position where the pressure plate is moved to the first position.

According to a third aspect of the present invention, a first receiving surface for receiving the pressure plate at a position where a gap corresponding to the thickness of the film without backing paper is formed between the film and the film rail surface formed on the camera body. A second receiving surface protruding from the camera body side than the first receiving surface at a position where a gap between the rail surface and the backing paper is a gap according to the thickness of the film; A notch into which the second receiving surface enters when the pressure plate is brought into contact with the first receiving surface;
A pressure plate spring that is provided between the pressure plate and the back cover and biases the pressure plate in a direction in which the pressure plate comes into contact with the respective receiving surfaces; and an external device that is provided outside the camera and that is selectively operated according to the type of film size. And an operation member, which is provided between the pressure plate and the back cover, and moves the pressure plate to a position where the cutout portion enters the second receiving surface in conjunction with the selection operation of the external operation member for the film without backing paper. This allows the pressure plate to abut on the first receiving surface, and moves the notch to a position shifted from the second receiving surface in conjunction with the selection operation for the film with backing paper. And a pressure plate moving means for bringing the pressure plate into contact with the second receiving surface.

According to a fourth aspect of the present invention, there is provided a camera having a pressure plate moving means for retracting the pressure plate by an amount corresponding to the second receiving surface coming out of the cutout portion, and then abutting the pressure plate on one of the receiving surfaces.

According to a fifth aspect of the present invention, there is provided a camera provided with a lock operation member provided outside the camera and a lock means for inhibiting a selection operation of the external operation member in accordance with the lock operation of the lock operation member. .

[0012]

FIG. 1 is a view of a camera body 11 with a back cover 10 opened, as viewed from the back. A film supply chamber 13 and a film take-up chamber 14 are arranged on both sides of the aperture 12, and an empty spool 15 is attached to the film take-up chamber 14 in advance. The brownie film 16 has a spool 17 in advance.
The film is loaded into the film supply chamber 13 as it is.

After loading, the leading end of the leader paper is inserted into the groove 18 of the spool 15 of the film take-up chamber 14, and the spool 15 is rotated in the film winding direction by pressing a winding button (not shown), and the leader paper is moved. The spool 15 is automatically wound by a few turns. After that, the back cover 1 is centered on the hinge 19.
When 0 is closed, the closed position of the back cover 10 is detected, and the film feeding is automatically performed in conjunction with this detection. When in the closed position, the back cover 10 covers at least the space between the film supply chamber 13 including the aperture 12 and the film winding chamber 14 from behind. The closed position of the back cover 10 is detected when the back cover 10 contacts the back cover detection switch 20 provided behind the camera body 11.

The film is fed by a photo-reflector disposed in the back through a transparent window 21 provided on the side of the film supply chamber 13 of the aperture 12, and the tape on which the leader paper and the film are adhered is transferred to the leader paper. Detection is performed based on the difference in reflectance. After the detection, a predetermined number of pulses are counted, and the first frame is set in the aperture 12. The pulse counting is performed by rotating a counter roller 22 for detecting the film winding amount arranged on the film winding chamber 14 side of the aperture 12 in contact with the film, and applying a slit of an impeller 23 directly connected to the upper part of the film. It is counted by the interrupter 24. The subsequent film feed for each frame is also controlled by this pulse count.

Film rails 25 and 26 are disposed above and below the aperture 12, respectively. Film rail 2
Reference numerals 5 and 26 denote narrow rails slightly projecting toward the back cover 10 and extending along the film feeding direction, and the projected surface has a screen area on the film emulsion side. The upper and lower edges of the outside are running film running surfaces. Above and below the pair of film rails 25 and 26, a pair of narrow pressure plate receiving surfaces 27 and 28 are provided to be long in the film feeding direction. The pair of pressure plate receiving surfaces 27, 28 are located on the back cover 10 more than the film running surfaces of the film rails 25, 26.
, And the interval along the film width direction is slightly longer than the film width. These film rails 25, 26
The step difference between the film running surface and the pressure plate receiving surfaces 27 and 28 becomes a gap of a tunnel corresponding to a thin film, in this example, a 220 roll film. Further, the pair of pressure plate receiving surfaces 27 and 28 also have a role of regulating upper and lower edges in the width direction of the brownie film 16 so that the film or the backing paper does not shift.

The upper pressure plate receiving surface 27 is divided into two at an arbitrary position along the film feeding direction, and a switch piece 29 for detecting a switching position of the pressure plate protrudes in these gaps. Is provided. This switch piece 2
When switch 9 is pushed in, switch 30 is turned on and switch 12 is turned on.
It is detected that the film gate for the 0 roll film has been selected, and that the switch 30 has been turned off and the selection has been made to the film gate for the 220 roll film. This information is sent to a control unit (not shown) provided in the camera body 11 and is used for switching control of the film counter and the film winding stop.

As shown in FIG. 2, the external operation member and the pressure plate moving means of the present invention are provided on the back cover 10. These means include a switching knob 33, a pressure plate 34, a pair of pressure plate springs 35 and 36, a pair of support plates 37 and 38, a pair of guide pins 39 and 40, a moving plate 41, and the like. The switching knob 33 is provided outside the back cover 10 and is selectively operated for a difference in film thickness.

The pressure plate 34 has a surface 34 b on the side of the back lid 10.
, A pair of guide pins 39 and 40 are screwed. Support plates 37 and 38 having a substantially Ω-shaped cross section are attached to the back cover 10. A pair of guide pins 39, 40 is inserted through openings 37a, 38a formed in the support plates 37, 38, and the back cover 10 pushes the pressure plate 34 through the guide pins 39, 40 in the film feeding direction. It is supported movably along the direction (optical axis direction) orthogonal to it. The guide pins 39 and 40 have a head whose diameter is larger than the openings 37a and 38a, and do not fall out of the support plates 37 and 38. As a result, the pressure plate 34 moves between a position where the film side surface 34a contacts the pair of pressure plate receiving surfaces 27 and 28 when the back cover 10 is closed and a position where it is retracted from the back cover 10 side. .

At positions 42 to 45 near the four corners of the surface 34b of the pressure plate 34 on the side of the back cover 10, as shown in an enlarged view of one of the surfaces 42, a surface 46 that is recessed by one step and a surface 46 Through holes 47 formed in the
7 is provided with pin members 48 respectively inserted from the side of the one-step recessed surface 46. The one-step recessed surface 46
The depth of the head of the pin member 48 is set slightly. These pin members 48 are pushed into the surface 46 whose head is recessed one step from the side of the back cover 10, so that the tip of the pin that has passed through the opening 47 projects to the film-side surface 34 a and the pair of pressure plate receiving surfaces 27, Contact 28. In the pressure plate 34, a through opening 49 is formed at a position corresponding to the switch piece 29 protruding from the camera body 11. When the back cover 10 is closed, the opening 49
To the surface 34 b of the pressure plate 34 on the side of the back cover 10.

The movable plate 41 is disposed behind the pressure plate 34, and has holes 50, through which a pair of guide pins 39, 40 are inserted.
51 are formed. These holes 50 and 51 are formed to be long along the film feeding direction. Thus, the moving plate 41 is slidable between the pressure plate 34 and the supporting plates 37 and 38 along the film feeding direction and movably along the direction perpendicular to the film feeding direction. Supported by

The head of the pin member 48 is pressed on the movable plate 41 at positions 52 to 55 corresponding to the four pin members 48 of the pressure plate 34, as shown by enlarging one of the portions 52. The pressing surface 56 and the concave surface 57 for retracting the pin member 48 toward the back cover 10 are formed by bending at positions corresponding to the sliding movement of the movable plate 41, respectively.
The cross section between the pressing surface 56 and the concave surface 57 has a gentle slope. The pair of pressure plate springs 35 and 36 uniformly urge the moving plate 41 toward the pressure plate 34.

The movable plate 41 is provided at a position corresponding to the switch piece 29 in accordance with the sliding movement.
The pressing surface 58 into which the pressure is pushed and the concave surface 59 into which the pressure is not pushed are formed by bending.

The switching knob 33 is rotatably supported on the back cover 10 by a rotating shaft 61 connected between the switching knob 33 and a small-diameter disc 60 for retaining provided inside the back cover 10. On the small-diameter disk 60, a connecting pin 62 is implanted on the surface on the side of the pressure plate 34 and at a position eccentric from the rotation shaft 61.
The connecting pin 62 enters a vertically long opening 63 formed in the moving plate 41, and moves the moving plate 41 in the film feeding direction in conjunction with the rotation operation of the switching knob 33.
In this example, since the pressure plate 34 moves in a direction perpendicular to the film feeding direction, the pressure plate 34 is formed with a recess 64 for releasing the tip of the connection pin 62 along the rotation locus of the connection pin 62. ing.

The switching knob 33 has a mark line 65 on its outer surface. In addition, on the outer surface of the back cover 10, film size types such as "120" and "220" are written. The operation is performed by rotating the switching knob 33 so as to match the type of the film size to be loaded, and setting the mark line 65 on the back cover 10 to “120” or “2”.
20 ”.

For example, when the mark line 65 is set to “220”, as shown in FIGS. 3 and 4, the concave surface 57 of the moving plate 41 slides to a position facing the head of the pin member 48. As a result, the pin member 48 is released without being pressed, and the pressure plate 34 is urged toward the film side via the movable plate 41 by the urging of the pair of pressure plate springs 35, 36, and the film side surface 34a of the pressure plate 34 is pressed. Are pressed against the pair of pressure plate receiving surfaces 27 and 28. As a result, the tunnel forming the film gate is formed by the film rail 25,
26 are formed between the film running surface 26 and the pressure plate receiving surfaces 27 and 28. At this time, the film-side surface 34a of the pressure plate 34 is brought into a state where the emulsion surface of the film is in a predetermined focus position when the 220-roll film is passed.

At this time, the switch piece 29 protruding from the opening 49 of the pressure plate 34 toward the back cover 10 is
And is not pushed.
As a result, the switch 30 is electrically turned off, and the control unit of the camera electrically recognizes that the tunnel gate for the 220 roll film is selected.

On the other hand, when the mark line 65 is set to "120", as shown in FIGS. 5 and 6, the pressing surface 56 of the movable plate 41 slides to a position facing the head of the pin member 48. The moving plate 41 includes a pair of pressure plate springs 35 and 36.
As a result, the pressing surface 56 pushes the pin member 48 toward the one-step recessed surface 46. When the pin member 48 is pushed in, the tip of the pin of the pin member 48 closes the opening 47 on the film side surface 34 a of the pressure plate 34.
And comes into contact with the pair of pressure plate receiving surfaces 27 and 28.
As a result, the movable plate 41 comes into contact with the head of the pin member 48, and the urging of the pair of pressure plate springs 35 and 36 is prevented.
The pressure plate 34 has a head seating surface of the pin member 48 and a one-step recessed surface 4.
6 is free to move within the range of play that occurs between them.

As for the 120-roll film, when the leader paper passes, the film adhered to the backing paper by the tape arrives. At this time, the pressure plate 34 is pushed toward the back cover 10 by the thickness of the film and due to the habit of the film (such as curl along the width direction of the film) and the like, so that the pressure plate 34 The concave surface 46 contacts. As a result, the film-side surface 34a of the pressure plate 34 becomes a position where the film emulsion surface of the 120-roll film is adjusted to a predetermined focus position.

After the moving plate 41 moves, the switch piece 29 exposed from the opening 49 of the pressure plate 34 faces the pressing surface 58 of the moving plate 41, and the switch piece 29 is pressed by the pressing surface 58. It is. Thereby, the switch 3
0 is electrically turned on, and the control unit of the camera
It can be electrically recognized that the tunnel gap for the 0 roll film is selected.

When the 120 roll film is selected, the tunnel is widened, and the thickness of the backing paper and the film slightly protrudes from the film running surfaces of the film rails 25 and 26 toward the back cover 10. For this reason, there is a possibility that the backing paper is shifted up and down in the width direction. Therefore, the pin member 4 protruding from the film side surface 34a of the pressure plate 34
The displacement in the vertical direction may be restricted by the pin 8. Also,
A plurality of guide bosses may be provided separately from the pin member 48, and these guide bosses may be used to restrict vertical displacement.

In the above embodiment, when the switching knob 33 is set to the state of selecting the 120-roll film without loading the film, the pressure plate 34 rattles. For this reason,
A leaf spring, which is weaker than the urging force of the pressure plate springs 35 and 36, is separately provided on the camera body 10 side.
It is preferable to urge in the direction of 0. According to this, when the pressure plate 34 is switched to the position for the 120-roll film, the pressure plate 34 is reliably brought close to the back cover 10, which is preferable.

In the above example, four pin members 48 are used, but the present invention is not limited to this number, and any number may be used, but the pressure plate 34 is held parallel to the film running surface. For this purpose, at least three pin members 48 are required. In this case, it is desirable to provide two on the upper or lower side with the aperture 12 therebetween and one on the opposite side. The pin member 48 is moved in and out by moving the moving plate 41 along the film feeding direction.
May be moved in the vertical direction of the camera to move the pin member 48 in and out.

In the above-described example, a tunnel gap for a 120-roll film is formed by the protrusion of the pin member 48 protruding from the film-side surface 34a of the pressure plate 34. Instead of this, the height is changed. A tunnel gap for a 120 roll film may be formed by utilizing a step between two types of pressure plate receiving surfaces.

In the example shown in FIG. 7, a second receiving surface 70 for forming a tunnel gap for a 120 roll film is provided.
A first receiving surface 71 for forming a tunnel gap for a 220 roll film, and a pair of film rails 25 and 2;
The pressure plate receiving surface is formed by alternately arranging thin and straight lines on the upper and lower sides of the film 6 along the film feeding direction.

The second receiving surface 70 protrudes more toward the back cover 10 than the first receiving surface 71. First receiving surface 71
Are slightly protruding toward the back cover 10 from the film running surfaces of the film rails 25 and 26. Then, the gap between the tunnels is changed by pressing the pressure plate 72 against one of the pressure plate receiving surfaces 70 and 71. In FIG. 7, only the upper film rail 25 and the pressure plate receiving surfaces 70 and 71 of the aperture are shown, and the lower film rail and the pressure plate receiving surface of the aperture are omitted to prevent the drawing from being complicated. .

The back cover 10 has a pair of guide pins 7 inside.
3, 74 are screwed. Supporting plates 75 and 76 each having a substantially Ω-shaped cross section are attached to a surface 72b of the pressure plate 72 on the side of the back cover 10. Openings 75a, 75a, which are elongated in the film feeding direction, are respectively formed in the pair of support plates 75, 76.
76a are formed. Guide pins 73 and 74 are inserted through the openings 75a and 76a. Guide pin 7
The heads 3 and 74 do not fall out of the support plates 75 and 76 because their heads are larger in diameter than the openings 75a and 76a. As a result, the back cover 10 supports the pressure plate 72 so as to be slidable in the film feeding direction and movably in the direction (optical axis direction) orthogonal to the film feeding direction.

In this example, the second receiving surfaces 70 are respectively arranged at symmetrical positions about the optical axis passing through the aperture 12, and a total of four second receiving surfaces 70 are provided. The number of the second receiving surfaces 70 is not limited to this, and may be any number. It is desirable to provide the right and left sides evenly.

The pressing plate 72 is formed with a notch 77 at a portion facing the second receiving surface 70. By sliding the pressing plate 72 in the film feeding direction, the film-side surface 72a of the pressing plate 72 is moved to the first side. The position of contact with the receiving surface 70 and the notch 77 are shifted from the second receiving surface 70 so that the pressure plate 7
The second film-side surface 72a moves in the optical axis direction between a position where the second film-side surface 72a contacts the second receiving surface 70. At this time, if the pressing plate 72 is simply slid, the edge of the cutout portion 77 hits the edge of the second receiving surface 70, and the pressure plate 72 or the second receiving surface 70 is cut off.

Even if both edges of the second receiving surface 70 are inclined so that the edges are not cut off, abrasion will occur in the width of the second receiving surface 70 when the plate is used for a long time.
And the gap in the tunnel will be out of order. Therefore, in this example, the pressure plate 72 is retracted substantially linearly toward the back cover 10 by the amount by which the notch portion 77 is retracted from the height of the second receiving surface 70, and then the pressure plate 72 is fed. In which the pressure plate 72 is again moved substantially linearly toward the film side and pressed against the second receiving surface 70.

Four support pins 78 are screwed near the four corners of the surface 72b of the pressure plate 72 on the side of the back cover 10.
The two left support pins 78 are inserted into fork portions 80 and 81 provided at the upper and lower ends of the rotating member 79, respectively. Another rotating member 82 is also provided on the two right supporting pins 78.
Fork portions 83 and 84 provided at the upper and lower ends of the fork are inserted. The pair of rotating members 79 and 82 are attached to the back cover 10 with their rotating shafts along the film width direction (vertical direction).
Is moved along a direction perpendicular to the film feeding direction. The fork portions 80, 8 of the rotating members 79, 82
1, 83 and 84 are formed with a long fork depth so that the support pins 78 do not come out even when the pressure plate 72 slides in the film feeding direction.

In the vicinity of the center of the rotating shaft of each of the rotating members 79 and 82, pressing plates 85 and 86 projecting toward the back cover 10 are formed facing each other. A pair of pressing plates 85,
Between the pair 86, a pair of slide plates 87 and 88 are arranged. A pair of slide plates 87, 88 are provided with guide pins 73, 74 and another guide pin 9 other than the guide pins 73, 74 formed in openings 89 to 92 formed to be elongated in the film feeding direction.
3, 94 are inserted respectively. Guide pin 93,
The back cover 10 is also screwed to the back cover 10, so that the back cover 10 has a pair of slide plates 87, 88 between the back cover 10 and the pressure plate 72.
Is movably supported in the film feeding direction.

A cam member 95 is inserted between the pair of slide plates 87 and 88. The cam member 95 has a substantially oval profile as a cam surface, and is connected via a back cover 10 to a switching knob 96 provided outside. The switching knob 96 is rotated according to the type of the film size. The cam member 95 moves the inner ends 97 of the pair of slide plates 87 and 88 in accordance with the rotation operation of the switching knob 96.
98, the pair of slide plates 87, 88 are moved between a position where their outer ends 99, 100 contact the pair of pressing plates 85, 86 and a position where they are retracted therefrom. The pair of slide plates 85 and 86 are mutually connected by springs 101 and 102.
And the inner ends 97 and 98 are always cam members 95
Urged to abut the contour of

On the film side surface of the cam member 95, a pin 104 projecting toward the pressure plate 72 is implanted at a position eccentric from the rotation shaft 103. The pin 104 enters the opening 105 provided in the pressure plate 72 when the pressure plate 72 retreats toward the back cover 10. This opening 105 is
The length in the vertical direction is longer than the diameter of the film 04, and the length in the film feeding direction is also longer. The play in the up and down direction is merely for taking out only the linear movement along the film feeding direction from the rotational movement of the pin 104,
The play in the film feeding direction plays a role of a delay for temporarily retracting the pressure plate 72 toward the back cover 10 and then sliding the pressing plate 72 along the film feeding direction.
Further, a pressure plate 72 is provided inside the back cover 10 with the pressure plate receiving surface 7.
A pair of pressure plate springs 10 for biasing toward 0, 71
6, 107 are respectively attached.

The switching knob 96 has a mark line 108 on its outer surface. In addition, on the outer surface of the back cover 10, film size types such as "120" and "220" are written. The operation is performed by rotating the switching knob 96 so that the mark line 108 matches one of “120” and “220” written on the back cover 10 so as to match the type of the film size to be loaded.

For example, when the mark line 108 is adjusted to the notation "220", as shown in FIG.
0 enters the notch 77 of the pressure plate 72,
Is in contact with the first receiving surface 71. At this time, the pin 104 is connected to the opening 1 of the pressure plate 72.
05, and the pressure plate 72 is slid to the right. Thereby, the pressure plate 72
Is switched to a position where the film emulsion surface of the 220 roll film is adjusted to a predetermined focus position. Further, the switch piece 29 enters the notch 77 and the switch 30 is turned off, so that the control unit of the camera can electrically recognize the selection of the tunnel gap of the 220 roll film.

When the switching knob 96 is rotated counterclockwise from the position shown in FIG. 7, the cam member 95 rotates together, and the contour of the cam member 95 becomes a pair of slide plates 87 and 88.
The inner ends 97 and 98 are biased toward each other in the direction in which the film is fed. When the pair of slide plates 87 and 88 move in the direction away from each other, the outer ends 99 and 100 are pressed by the pressing plates 8 of the pair of rotating members 79 and 82.
5 and 86 are urged to rotate the pair of rotating members 79 and 82 in opposite directions. During this time, the pin 104 also rotates, but since the length of the opening 105 in the film feeding direction is long, the pressure plate 72 does not slide along the film feeding direction.

When the pair of rotating members 79 and 82 rotate,
The forks 80, 81, 83, 84 abut against the head seat surface of the support pin 78 and push the support pin 78 toward the back cover 10. Thereby, the pressure plate 72 is moved to the pressure plate springs 106 and 107.
9, the notch 77 is linearly moved toward the back cover 10 and the notch 77 is formed in the second receiving surface 70 as shown in FIG.
Get out of At this time, the connecting pin 104 enters the opening 105 of the pressure plate 72. Further, the cam member 95 is in a state where the longest diameter portion of the oval-shaped contour is in contact with the inner ends 97 and 98.

Thereafter, when the rotating operation of the switching knob 96 is continued, the pin 104 comes into contact with the left edge of the opening 105, and
The pressure plate 72 is slid in the film feeding direction. Since the pin 104 and the cam member 95 rotate together, the diameter of the cam member 95 along the film feeding direction gradually decreases while the pressure plate 72 is slid, so that the pair of slide members 97 , 98 are moved toward each other by the urging of the springs 101, 102, and after the previous pressure plate 72 has slid, or immediately before the completion of the sliding movement, the film is again urged by the urging of the pressure plate springs 106, 107. Moved towards the side. Thereby, the pressure plate 72
As shown in FIG. 10, the film-side surface 72a of the second
The sliding movement of the pressure plate 72 has been completed before the contact with the receiving surface 70. At this time, the pin 104 is in contact with the left edge of the opening 105.

In this state, the film-side surface 72a of the pressure plate 72 is at a position where the film emulsion surface of the 120-roll film is in a predetermined focus position. Also, the switch piece 29 is a film-side surface 72a of the pressure plate 72.
, The switch 30 is turned ON, and it can be electrically recognized that the control unit of the camera has switched to the selection of the tunnel gap of the 120-roll film.

Next, when the switching knob 96 is switched so as to align the mark line 108 with the notation "220", the cam member 95 again moves the pair of slide plates 87, 88 in the direction away from each other and rotates. Members 79, 8
2 are rotated in opposite directions. This allows
The pressure plate 72 is moved toward the back cover 10. During this time,
The pin 104 only moves from the left end to the right end of the opening 105, and does not slide the pressure plate 72 along the film feeding direction.

After the pressure plate 72 is retracted toward the back cover 10, the pin 104 pushes the right end of the opening 105 by continuing the selection operation of the switching knob 96.
Is slid toward the right side in the film feeding direction. After or just before the completion of this slide movement,
The pressure plate 72 is moved toward the film. Thereby, the notch 77 enters the pressure plate receiving surface 70 again,
The surface 72a of the pressure plate 72 contacts the first receiving surface 71, and returns to the state shown in FIG.

In each of the above-described embodiments, the switching knob 3
After selecting 3,96, the switch knob 3
Operating 3,96 will change the tunnel gap. Therefore, a lock mechanism may be provided to prevent erroneous operation of the switching knobs 33, 96 after selecting the switching knobs 33, 96.

An example in which such a lock mechanism is used in the example described with reference to FIG. 7 will be described below. A lock knob 111 is rotatably provided outside the back cover 10 in addition to the switching knob 96. The lock knob 111 is a lock lever 1 disposed inside the back cover 10 via the back cover 10.
12. The lock lever 112 rotates between a position where the lock lever 112 enters the notch 113 formed in the slide plate 88 and a position where the lock lever 112 is retracted in accordance with a rotation operation of the lock knob 111.

In this example, when the rotating operation is performed so that the mark line 114 of the lock knob 111 matches the “Rock” written on the outer surface of the back cover 10, the lock lever 112 enters the notch 113. As a result, the slide movement of the slide plate 88 along the film feeding direction is prevented, and the rotation of the switching knob 96 cannot be performed. Then, the mark line 114 is written on the outer surface of the back cover 10 as “UN
When the lock knob 111 is rotated to match “Rock”, the lock lever 112 is disengaged from the notch 113 to allow the sliding movement of the slide plate 88, whereby the rotation operation of the switching knob 96 is also allowed.

In each of the above examples, the switching knobs 33 and 96 corresponding to the external operation members are provided outside the back cover 10, but they may be provided outside the camera body 11. Further, although the switching operation is performed by a rotation mechanism, a slide mechanism may be used instead.

[0056]

As described above, according to the camera of the present invention, the tunnel gap of the film gate can be switched from the outside of the camera by selecting the external operation member for the type of the film of the brownie size. Even after the film is loaded and the back cover is closed and the film is wound up, the switching position of the pressure plate can be easily changed. As a result, inconveniences such as film flaws and a decrease in focusing accuracy described in the related art can be reliably reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a camera of the present invention as viewed from the rear side, and shows a state in which a back cover is opened.

FIG. 2 is an exploded perspective view of the back cover of the camera described with reference to FIG. 1, viewed from the back side.

FIG. 3 is an enlarged cross-sectional view of a main part of a horizontal section of the camera in a state of a tunnel gap for a 220 roll film.

FIG. 4 is an enlarged cross-sectional view of a main part of the camera when the camera is in a state of a tunnel gap for a 220 roll film.

FIG. 5 is an enlarged cross-sectional view of a main part of a horizontal section of the camera in a state of a tunnel gap for a 120 roll film.

FIG. 6 is an enlarged cross-sectional view of a main part of the camera in a vertically cut state in a state of a tunnel gap for a 120 roll film.

FIG. 7 is an exploded view showing a camera back cover according to another embodiment in which two types of pressure plate receiving surfaces having different heights are provided, and a pressure plate is pressed against one of these pressure plate receiving surfaces to change a gap in a tunnel. It is a perspective view.

8 is an enlarged cross-sectional view of a principal part of the camera described in FIG. 7 in a horizontal section, and shows a state where a tunnel gap is set for a 220 roll film.

9 is an enlarged cross-sectional view of a main part of the camera described in FIG. 7 in a horizontal section, showing a state in which the pressure plate is retracted toward the back cover side.

FIG. 10 is an enlarged sectional view of a main part of the camera described in FIG. 7 in a horizontal section, and shows a state where a tunnel gap is switched to a 120 roll film.

[Explanation of symbols]

 Reference Signs List 10 back cover 11 camera body 12 aperture 25, 26 film rail 27, 28 pressure plate receiving surface 34, 72 pressure plate 35, 36, 106, 107 pressure plate spring 41 moving plate 48 pin member 70 second receiving surface 71 first receiving surface 87, 88 slide plate

Claims (5)

[Claims] 1. A camera in which a pressure plate of a back cover is movably held, and the pressure plate can be moved in a photographing optical axis direction depending on whether or not a photo film to be used has backing paper. A pressure plate receiving surface for receiving the pressure plate at a position where a gap corresponding to the thickness of the photo film without backing paper is formed in parallel with the formed film rail surface, and a first position contacting the pressure plate receiving surface, Holding means for movably holding the pressure plate between a second position spaced from the pressure plate receiving surface by a predetermined distance toward the back cover side; and a holding means provided between the pressure plate and the back cover, wherein the pressure plate is provided. A pressure plate spring biasing in a direction to be brought into contact with the pressure plate receiving surface; an external operation member provided outside the camera and selectively operated according to the presence or absence of the backing paper; Select operation for film The press plate is moved to the first position using the urging force of the press plate spring in conjunction with the urging force of the press plate spring in conjunction with the selection operation for the film with backing paper. And a pressure plate moving means for permitting the pressure plate to move to the second position. 2. The pressure plate moving means is provided between the pressure plate spring and the pressure plate, a plurality of pin members provided on the pressure plate so as to be able to move in and out from the back cover side toward the pressure plate receiving surface, and By pressing the pin member by using the urging force of a spring to bring the pin tip into contact with the pressure plate receiving surface, the pressure plate is moved to the second position.
The external operation is performed between a position for moving the pressure plate to the first position by pressing the pressure plate using the urging force of the pressure plate spring to retract the pin member into the pressure plate. 2. The camera according to claim 1, further comprising a moving plate that moves in conjunction with operation of the member. 3. A camera in which a pressure plate of a back cover is movably held, and the pressure plate can be moved in a photographing optical axis direction depending on whether or not a backing sheet is present in a photographic film to be used. A first receiving surface for receiving the pressure plate at a position where a gap corresponding to the thickness of the photographic film in the form of no backing paper is formed between the film rail surface and the film rail surface; A second receiving surface protruding from the camera body side to the back cover side from the first receiving surface at a position corresponding to a gap corresponding to the thickness of the photographic film having backing paper; A notch portion into which the second receiving surface enters when the pressure plate is brought into contact with the first receiving surface; and a notch provided between the pressure plate and the back cover, wherein the pressure plate contacts the respective receiving surface. Pressure plate spring biasing in the direction of An external operation member provided outside the camera and selectively operated according to the presence or absence of the backing paper; and an external operation member provided between the pressure plate and the back cover for selectively operating the external operation member for a film without backing paper. The pressure plate is brought into contact with the first receiving surface by moving the pressure plate to a position where the notch enters the second receiving surface in conjunction with
In addition, in conjunction with the selection operation for the film with backing paper, the notch is moved to a position where the cutout portion is displaced from the second receiving surface so that the pressure plate is brought into contact with the second receiving surface. A camera comprising a pressure plate moving means. 4. The pressure plate moving means, wherein the pressure plate is retracted by an amount corresponding to the pressure plate pressing height rail coming out of the cutout portion, and then the pressure plate is brought into contact with one of the receiving surfaces. 3. The camera according to 3. 5. A camera according to claim 1, further comprising a lock operation member provided outside said camera, and a lock means for inhibiting a selection operation of said external operation member in accordance with a lock operation of said lock operation member. 5. The camera according to any one of 1 to 4.