JP3343176B2 - Camera reel chamber, camera, method of manufacturing camera reel chamber, and mold used in method of manufacturing camera reel chamber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention, the tip portion of the film is re
Of the camera that is fed while sliding on the inner wall of the
Reel room, a camera having the reel room, and a camera reel.
Manufacturing method of the mold chamber and the mold used in the manufacturing method
Related.

[0002]

2. Description of the Related Art Next, a conventional example will be described with reference to the drawings.
First, a first conventional example will be described with reference to FIG. In the figure, reference numeral 1 denotes a body main body, and a reel chamber 2 is formed at one end. Reference numeral 3 denotes a reel provided in the reel chamber 2 and driven to rotate. Reference numeral 4 denotes a back cover which is attached to the body 1 via a hinge mechanism 5 so as to be openable and closable. Reference numeral 6 denotes a pressure plate provided on the back cover 4 and pressing the film 7 against the body 1.

[0003] 8 has flexibility, the base end is the body body 1
The guide plate 10 is provided with a roller 9 at the tip end thereof, which is in contact with the reel 3. The guide plate 10 is provided with a base end portion attached to the back lid 4 and a roller 11 at the tip end thereof. It is.

Next, the operation of the above configuration will be described. Back cover 4
Is opened, the film is pulled out from the patrone, and the leading end is placed on the reel 3. Next, when the back cover 4 is closed, the rollers 11 of the guide plate 10 press the film 7 onto the reel 3. Further, when the back cover 4 is closed, the reel 3 is rotated by a driving device (not shown), and the projections 3a formed on the reel 3 are engaged with the perforations of the film 7,
The leading end of the film 7 moves in the direction of the arrow in the figure while sliding on the inner wall surface 2a of the reel chamber 2.

The leading end of the film 7 is guided by a guide plate 8
To reel 3. Then, the film 7 is wound up by several frames, and the automatic loading is completed.
The above-described reel chamber is formed by forming a substantially arc-shaped unit integrally with the body main body 1 up to the opening of the reel chamber. This arc-shaped wall is formed by a technique in which a single mold is used for resin molding in the reel chamber, and the mold is pulled downward in the drawing.

Accordingly, the inner wall surface 2a of the reel chamber is free of burrs due to molding, and the film is smoothly slid on the inner wall surface 2a during auto loading. On the other hand, in order to remove the mold, the opening dimension (W
Since 1) is substantially the same as or wider than the internal dimension (W1 '), the lateral dimension of the camera is increased.

Further, in order to prevent light from leaking from the hinge mechanism 5 into the reel chamber, a light-shielding means is required, and the width is increased. As described above, in the first conventional example, the film is slidably contacted with the wall surface of the reel chamber. However, since the width of the opening of the reel chamber is large, the width of the camera becomes large. There is a major drawback to miniaturization, which is a major problem.

Here, for the purpose of reducing the size of the camera, a method of reducing the width of the opening of the reel chamber and integrally forming the arc-shaped inner wall surface constituting the reel chamber will be described.

Generally, in a resin molding method, when a reel chamber having a smaller opening dimension than the internal dimension is formed, a part near the opening area of the opening of the reel chamber becomes an obstacle in removing the mold.
When there is a so-called undercut portion, a method using a slide mold is conceivable. That is, a first mold,
The reel chamber can be formed integrally with the first mold using a second mold (slide mold) movable in a direction substantially perpendicular to the pulling direction even if there is an undercut portion. it can.

However, when the reel chamber is formed by the above method, burrs are formed on the inner wall surface of the reel chamber along the end of the mating surface of the two dies, that is, along the parting line. This state is shown in FIG. 7, which is a partially enlarged view of the reel chamber.

As shown in FIG. 7, the shape of the burr is such that the projection direction with respect to the inner wall surface 22a is an acute angle (Δα in the figure).
And a burr 22c whose projection direction with respect to the inner wall surface 22a is obtuse (角 β in the figure).

In the case of a burr 22c whose projection direction is obtuse, the film 27 in sliding contact with the inner wall surface 22a can easily get over the burr 22c. However, when the projection direction of the burr 22b is an acute angle, the leading end of the film 27 is caught by the burr 22b, which causes an auto-loading error.

Therefore, it is necessary to separately remove such burrs 22c in a separate process and to provide a prevention member for preventing the leading end of the film from being caught, and the second mold (slide mold) is required.
(That is, using a plurality of molds), it was not practical to integrally form the resin in the reel chamber.

On the other hand, using the technique of the first conventional example (using one mold for the reel chamber), the burr is not generated in the reel chamber, and the width of the opening is made small to make the camera compact. A reel chamber having a configuration described above is also considered. This is shown in FIG. 6 as a second conventional example.

The width dimension (W) of the opening of the reel chamber 2 having such a configuration is the same as the internal dimension (W '). Therefore, there is a reel chamber having a configuration as shown in FIG. 6 in which the width of the opening of the reel chamber is made smaller than the internal dimension in order to reduce the width of the camera.

In FIG. 1, reference numeral 21 denotes a body main body, and a reel chamber 22 is formed at one end. Reference numeral 23 denotes a reel provided in the reel chamber 22 and driven to rotate.
Reference numeral 32 denotes a sub-body main body that forms the reel chamber 22 together with the body main body 21.

Reference numeral 24 denotes a back cover which is attached to be able to open and close via a hinge mechanism 25 provided on the sub-body main body 32. Reference numeral 26 denotes a pressure plate provided on the back cover 24 and pressing the film 27 against the body 21.

Reference numeral 28 denotes a guide plate having flexibility, a base end portion of which is attached to the body 21 and a tip end portion of which is provided with a roller 29 which comes into contact with the reel 23.
Roller 3 which is attached to
Reference numeral 1 denotes a guide plate provided.

Reference numeral 33 denotes a body cover. At one end of the body cover 33, a condenser chamber 34 in which a flash condenser (not shown) is provided is formed. A battery cover 35 is provided on the hinge mechanism of the sub-body main body 32 so as to be openable and closable. A battery chamber 36 is formed in the battery cover 35.

The auto-loading operation is the same as in the first conventional example, and a description thereof will be omitted. The difference between the second conventional example and the first conventional example is that
In order to smoothly make contact with the inner wall surface of the film and to make the opening width (W2) smaller than the internal size (W2 '), the undercut portion is attached to the body body 2.
This is realized by a sub-body 32 separate from the sub-body 1 to reduce the lateral width of the camera.

The body 21 and the sub-body 32
In order to prevent the film from being caught at the joint, the dimensions are such that the body 21 can be lowered when viewed from the direction in which the film advances.

Accordingly, the second conventional example can be made smaller than the first conventional example, but since the back cover 24 is mounted via the sub-body main body 32, the mounting accuracy to the body main body 21 is reduced. Getting worse.

Also, since the sub-body main body 32 is required,
The number of parts increases, and the number of assembly steps also increases.

[0024]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide molding burrs.
Elimination of smooth sliding of the film on the reel interior wall
And the mounting accuracy of the back cover is good.
Mera reel chamber, camera, method of manufacturing camera reel chamber
And to provide molds used in camera manufacturing methods.
is there

[0025]

Means for Solving the Problems Claims for solving the above problems
The invention described in Item 1 is characterized in that the leading end of the film has an inner wall of the reel chamber.
In the reel room of the camera that is sent while sliding on the surface
The reel chamber is integrally formed of resin and the reel
Fill the parting line on the inner wall of the room
Forming a stepped portion as viewed from the traveling direction of the
Of the burr generated on the parting line
It is set to be deeper than
This is the camera reel room. The invention according to claim 2 is characterized in that
The stepped portion has a projection direction of the burr and an inner wall surface of the reel chamber.
The feature is that it is provided at a position where the angle made is an acute angle
The reel room of the camera according to claim 1. Claim
According to a third aspect of the present invention, there is provided the reel chamber according to the first or second aspect.
A camera characterized in that:

According to a fourth aspect of the present invention, there is provided an image forming apparatus comprising:
Camera is fed while sliding on the inner wall of the reel chamber
In the reel chamber manufacturing method, the width gradually increases toward the opening.
A first mold having a larger width and a first mold adjacent to the first mold.
Placed in a direction substantially perpendicular to the direction in which the first mold is removed.
Using the second mold movably provided, the lead
Of the film from the direction of travel of the film
Only the parting depth of the two molds
A step that is deeper than the burr generated on the line is provided.
So that the reel chamber is integrally formed of resin,
The parting line of the two molds is located at
And a method of manufacturing a reel chamber of a camera.

According to a fifth aspect of the present invention, the step portion has
The angle between the projection direction of the burr and the inner wall surface of the reel chamber is sharp.
It is characterized by being molded so that it is provided at the corner position
5. The method according to claim 4, wherein the reel chamber of the camera is manufactured.
You.

The invention according to claim 6 is the invention according to claim 4 or 5.
Used in the method for manufacturing a reel chamber of a camera described in (1)
It is.

[0029]

[Function] Camera reel room, camera, camera reel room
Used in the manufacturing method of the camera and the manufacturing method of the camera reel chamber.
Molding of the reel chamber with resin
As a result, the mounting accuracy of the back cover is improved.

Camera reel room and camera invention
Position of the parting line on the inner wall surface of the reel chamber.
Shape the stepped part as viewed from the direction of film advance
And the depth of the step is reflected on the parting line.
Be set to be deeper than the height of the burr
And the burr generated along the parting line
The film does not project to the inner wall where the film slides,
Sliding contact with the inner wall of the room is made smoothly.

A method for manufacturing a camera reel chamber and a camera
In the invention of the mold used in the method of manufacturing the reel chamber,
The film is fed while the leading edge of the film slides against the inner wall of the reel chamber.
In the method of manufacturing the reel chamber of the camera
A first mold whose width gradually increases toward
The first mold is disposed adjacent to the mold,
And a second mold movably provided in a direction substantially orthogonal to the second mold.
Using the method of moving the film on the inner wall surface of the reel chamber
Seeing from the opposite direction, the depth of the two gold
Deeper than the burr generated on the parting line of the mold
Molded so that a step is provided, and the two
By positioning the mold parting line,
Burrs generated along the printing line cause the film to slide.
The inner wall surface of the film reel chamber does not protrude from the inner wall surface in contact
Sliding contact with is performed smoothly.

Further, a reel room of a camera, a camera, and a camera
Method of manufacturing reel chamber of camera and method of manufacturing reel chamber of camera
In the invention of the mold used in the above, the stepped portion is
The angle between the projecting direction of the reel and the inner wall surface of the reel chamber is an acute angle.
Is provided at the position where
The angle between the direction and the inner wall surface of the reel chamber is an acute angle,
The depth of the step is higher than the burr height of the parting line
By being deep, burrs do not protrude on the inner wall surface of the reel chamber,
Sliding of the film on the inner wall of the reel chamber is not smooth
It is.

[0033]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a reel chamber of a camera according to an embodiment of the present invention.

In the figure, reference numeral 51 denotes a body main body, and a reel chamber 52 is formed at one end. A reel 53 is provided in the reel chamber 52 and is driven to rotate.
A back cover 54 is attached to the body 51 via a hinge mechanism 55 so as to be openable and closable. Reference numeral 56 denotes a pressure plate provided on the back cover 54 and pressing the film 57 against the body 51.

Reference numeral 58 denotes a guide plate having flexibility, a base end portion of which is attached to the body 51, and a tip end provided with a roller 59 which comes into contact with the reel 53;
Roller 6 which is attached to the
Reference numeral 1 denotes a guide plate provided.

In this embodiment, the body 51 is manufactured by a resin molding method, and an opening (represented by W in the figure) has an internal dimension (in the figure, W) in the opening of the reel chamber 52.
(Indicated by W ′) is formed.

The inner wall surface 5 of the reel chamber 52 of the body 51
A first step portion 51c and a second step portion 51d which are lowered when viewed from the traveling direction of the film 57 are formed in 2a. Next, a method of forming the body main body 51 will be described with reference to FIGS. As shown in FIG. 2, the first step portion 51c
Is composed of two stepped portions 51e and 51f which are lowered when viewed from the traveling direction of the film 57.

The reel chamber 52 of the body 51 is manufactured using three dies. 70 is a mold main body, 71 is movable with respect to the mold main body 70 along a pulling-out direction of the mold main body 70 (in FIG. 2, an arrow III direction).
It is a first slide mold provided in the direction of arrow I). The first slide die 71 is formed with a slope 71 a whose width gradually increases toward the opening of the reel chamber 52.

Reference numeral 72 denotes a slope 71 of the first slide mold 71.
A direction that is arranged adjacent to the a side and is orthogonal to the sliding direction of the first slide mold 71 (the direction of arrow II in FIG. 2).
The second slide mold 72 is provided so as to be movable on the second slide mold.

Here, the mold 70 and the first slide mold 7
The parting line between the first slide mold 71 and the second slide mold 72 is the corner of the second step 51d as shown in FIG. The corners of the step 51e and the step 51f of the section 51c were formed.

In the first step 51c, the depth (t) of the step 51e is determined by the height of the burr generated on the parting line between the first slide die 71 and the second slide die 72. It is set to be deeper.

Further, with respect to the position of the step 51c formed by the second slide mold 72, the step 51f is lower than the step 51c in the figure due to an error in the positional accuracy of the first slide mold 71, ie, A step 51f is provided in advance so as to prevent a step (hereinafter referred to as an inverted step) projecting toward the reel chamber, and the depth (t ') of the step 51f is set to be equal to the first slide mold 72 and the first slide mold 72.
Is set to be equal to or more than the error of the positional accuracy with respect to the slide mold 71.

For the same reason, the depth of the second step 51d
(t ″) is set to be equal to or greater than the error in the positional accuracy between the first slide mold 71 and the mold body 70. Incidentally, the applicant set the above dimensions as follows, and Results were obtained.

T = 0.4 mm t ′ = 0.1 mm t ″ = 0.1 mm The height of the burr is about 0.1 mm.

When forming the reel chamber 52 by using such dies 70 to 72, first, the first slide die 71 is slid in the direction of arrow I in FIG. When the first slide mold 71 is moved in the direction of the arrow I, the second slide mold 72 is movable in the direction of the mold body 70 (the arrow II), and is slid in the direction of the arrow II. It is separated from the second slide mold 72.

Finally, the body body 51 having the undercut portion 51a is manufactured by pulling out the mold body 70 in the direction of arrow III. Next, the operation of the above configuration will be described with reference to FIG. The back cover 54 is opened, the film 57 is pulled out from the patrone, and the leading end is placed on the reel 53.

Next, when the back cover 54 is closed, the guide plate 60
Roller 61 presses the film 57 onto the reel 53. Further, when the back cover 54 is closed, the reel 53 is rotated by a driving device (not shown), and the projection 53 a formed on the reel 53 is engaged with the perforation of the film 57. Wall 52
It moves in the direction of the arrow in the figure while sliding on a.

The leading end of the film 57 is guided by the guide plate 58 and heads toward the reel 53. Then, the film 57 is wound up for several frames, and the auto loading is completed.

According to the above configuration, the following effects can be obtained. (1) The mold body 70 and the first and second slide molds 71 and 7
2, the undercut portion 51a is attached to the body main body 51.
And formed integrally. Therefore, it is possible to reduce the lateral width of the camera as compared with a reel chamber having a straight opening.

Also, the mounting accuracy of the back cover 54 is better than forming the undercut portion with a separate member. (2) Generally, when resin molding is performed using a plurality of molds,
Due to an error in the positional accuracy of the mold, it projects on the inner wall surface of the reel chamber 52 as the object to be molded, and
There is a case where an inverted step is formed to avoid the sliding contact of the inner wall surface 52a.

However, in this embodiment, the depth of the step 51f of the first step 51c corresponding to the first slide die 71
(t ′) and the second step 51 corresponding to the mold body 70
By setting the depth (t ″) of d to be equal to or more than the error of the positional accuracy of each mold, the occurrence of the reverse step is eliminated, so that a smooth sliding contact of the film 57 can be obtained.

(3) Of the burrs formed along the two parting lines of the molds 70 to 72 of this embodiment, along the parting line between the fixed mold 70 and the first slide mold 71. The direction of the formed burr is obtuse with respect to the inner wall surface, and does not restrict the sliding contact of the film 57.

However, the burr formed on the first step portion 51c protrudes along the slope 71a of the first slide die 71. The angle between the burr and the inner wall surface 52a of the reel chamber 52 is an acute angle, but the depth (t) of the step portion 51e is set to be deeper than the height of the burr, so that the burr is The film 57 is prevented from sticking to the burrs without protruding, and the film 57 is smoothly slid on the inner wall surface 52a of the reel chamber 52.

Next, another embodiment of the present invention will be described with reference to FIG. In the present embodiment, one step 51h is formed on the inner wall surface 52a by the first slide die 71 and the second slide die 72. The depth (T) of the step was set to be deeper than the height of burrs generated on the parting line between the first slide die 71 and the second slide die 72.

Also in this embodiment, the burrs are formed in the reel chamber 52.
Of the film 57 in the reel chamber 5
The sliding contact of the second 2 with the inner wall surface 52a is performed smoothly.

[0056]

According to the present invention, the reel room, camera, camera
Method of manufacturing reel chamber of camera and manufacturing of reel chamber of camera
According to the mold used in the method, the reel chamber is integrated with resin
The molding accuracy of the back cover is good
You.

According to the reel room and the camera of the camera of the present invention,
The parting line on the inner wall of the reel chamber
The stepped part that falls into the position when viewed from the direction of travel of the film is
Formed, and the depth of the step portion is equal to the parting line.
It is set to be deeper than the height of the generated burr
Burrs along the parting line
Does not protrude from the inner wall where the film slides,
Sliding contact with the inner wall surface of the tool room is made smoothly.

A method of manufacturing a reel chamber of a camera according to the present invention and
Depends on the mold used in the camera reel chamber manufacturing method
If the leading edge of the film slides against the inner wall of the reel chamber,
In the method of manufacturing the reel chamber of the camera sent from
A first mold whose width gradually increases toward the opening;
Removing the first mold disposed adjacent to the first mold;
Mold provided movably in a direction substantially perpendicular to the direction
To advance the film on the inner wall surface of the reel chamber.
The dip is seen from the line direction, and the dip depth is the above two
Than the height of burr generated on the parting line of the mold
Formed so that a deep step is provided, and
Positioning of two mold parting lines
Burrs generated along the parting line
The film does not project to the inner wall where the
Sliding contact with the inner wall surface is made smoothly.

Further, a reel room of a camera, a camera, and a camera
Method of manufacturing reel chamber of camera and method of manufacturing reel chamber of camera
According to the invention of the mold used in the above, the stepped portion is
The angle between the projecting direction of the reel and the inner wall surface of the reel chamber is an acute angle.
Is provided at the position where
The angle between the direction and the inner wall surface of the reel chamber is an acute angle,
The depth of the step is higher than the burr height of the parting line
By being deep, burrs do not protrude on the inner wall surface of the reel chamber,
Sliding of the film on the inner wall of the reel chamber is not smooth
It is.

[Brief description of the drawings]

FIG. 1 is a sectional view of a reel chamber of a camera according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a method of manufacturing the body main body in FIG.

FIG. 3 is an enlarged view of FIG. 2;

FIG. 4 is an explanatory diagram of a method of manufacturing a body main body according to another embodiment.

FIG. 5 is a sectional view of a reel chamber of the first conventional camera.

FIG. 6 is a sectional view of a reel chamber of a second conventional camera.

FIG. 7 is an explanatory diagram of burrs generated during integral molding.

[Description of Signs] 51 Body main body 51a Undercut section 51c, 51d Step section 53 Reel 54 Back cover 57 Film

Claims (6)

(57) [Claims] 1. The front end of a film is mounted on an inner wall surface of a reel chamber.
In the reel chamber of the camera which is fed in sliding contact, the reel chamber is integrally formed of resin, and is located at a parting line on the inner wall surface of the reel chamber.
Forming a stepped part as seen from the direction of travel of the film
And the depth of the step occurs in the parting line
A camera reel chamber set to be deeper than a burr . 2. The method according to claim 1, wherein the step portion is provided in a direction in which the burr projects.
It is provided at a position where the angle between the reel chamber and the inner wall is acute.
2. The camera lead according to claim 1, wherein
Room. 3. A reel chamber according to claim 1 or 2 is provided.
A camera characterized in that: 4. The front end of the film is on the inner wall surface of the reel chamber.
Method for manufacturing a reel chamber of a camera fed while sliding
A first mold having a width gradually increasing toward the opening;
Removing the first mold disposed adjacent to the first mold;
Mold provided movably in a direction substantially perpendicular to the direction
To advance the film on the inner wall surface of the reel chamber.
The dip is seen from the line direction, and the dip depth is the above two
Than the height of burr generated on the parting line of the mold
The reel chamber is integrated with resin so that a deep step is provided.
And parting lines of the two molds are positioned on the step.
A method for manufacturing a reel chamber of a camera, characterized in that: 5. The device according to claim 5, wherein the step portion is provided in a direction in which the burr protrudes.
It is provided at a position where the angle between the reel chamber and the inner wall is acute.
5. The power supply according to claim 4, wherein
Manufacturing method of Mera's reel chamber. 6. A reel for a camera according to claim 4 or 5.
A mold used in the method of manufacturing a chamber.