JPH0447705Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a locking device for a magazine bag that is removably attached to a camera body, and particularly to a locking device that is electrically linked to the opening and closing of the light-shielding cover of the magazine bag. It is.

(Prior Art) In a camera in which a magazine bag loaded with film is removably attached to the camera body, a light-shielding lid that blocks light from the opening of the magazine bag can be attached and detached only when the opening is completely closed. There needs to be. In other words, if the magazine bag is accidentally removed from the camera body with the light-shielding lid open, the film inside will be exposed. It is known that a safety device is installed so that the camera can be removed from the camera body.

However, in conventional safety devices of this type, the magazine back is locked to the camera body by a locking mechanism that is mechanically linked to the light-shielding lid, which makes the linking mechanism complicated, increases costs, and increases the risk of failure. It has the disadvantage of being the cause. (For example, Utility Model Application Publication No. 52-75431, etc.) (Purpose of the invention) This invention was made in view of the above problems, and uses a simple mechanism to completely insert the light-shielding lid into the magazine bag. It is an object of the present invention to provide a locking device that prevents the magazine bag from being removed from the camera body when it is not in use.

(Structure of the invention) The magazine bag locking device of the present invention includes a lock lever having a locking pawl that can be engaged with a locking pawl formed on the magazine back, which is movably disposed inside the camera body, and which is engaged with the lock lever. A lock pawl for locking the lock lever by locking the lock lever, an electromagnet for separating the lock pawl from the lock lever, and a release lever movable on the lock lever are provided, and the magazine bag is closed by inserting a light-shielding lid into the magazine bag. A first switch and a second switch, which is closed by moving the release lever in the release direction, are connected in series between the power source and the electromagnet through contacts provided on the camera body and the magazine back, respectively. It is characterized by this.

(Effect of the invention) According to the magazine bag locking device of the present invention configured as described above, when the magazine bag is removed from the camera body, if the light-shielding lid is not completely inserted into the magazine bag, the light-shielding lid is not completely inserted into the magazine bag. Since the first switch located in contact with the lid is open, push the release lever in the release direction to release the second switch.
Even if the switch is closed, the power supply voltage is not applied to the electromagnet, so the engagement between the lock claw and the lock lever is not released, and the engagement between the locking claw on the camera body and the locking claw on the magazine back is also not released. The magazine bag cannot be removed from the camera body.

That is, according to the present invention, the magazine bag can be electrically locked by a simple combination of a switch and an electromagnet, and exposure of the film to light when the magazine bag is removed due to forgetting to close the light-shielding lid can be completely prevented.

(Example) An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing a magazine bag locking mechanism according to the present invention.

A substantially rectangular lock lever 2 is provided within the camera body 1 in close proximity to the rear surface 1a of the camera body 1 so as to be movable in the horizontal direction in the figure along the rear surface 1a. A pair of elongated holes 2a are formed which are guided by two guide pins 3 implanted in the main body 1. On one side of the lock lever 2 adjacent to the back surface 1a of the camera body 1, a pair of first locking claws 2 protrude from a pair of openings 1b formed in the back surface 1a.
b is formed, and on one side of the lock lever 2 opposite to the side on which the first locking pawl 2b is formed, there is a protrusion 2 having a stepped portion 2c near the right end in the figure.
d, and a protrusion 2e on which the release lever 4 is mounted is formed on the left side of the center in the figure. This release lever 4 is formed with a pair of elongated holes 4a that are guided by two guide pins 5 implanted in the protrusion 2e. It is now possible to move within the range of 4a,
Furthermore, an arm 4b formed on the release lever 4
The lock lever 2 is biased rightward by a first spring 6 suspended between the lock lever 2 and the lock lever 2.
Also, an inclined portion 4c is located at the right end of the release lever 4 in the figure.
However, there is an arm 4d on the left end and a knob 4e on the top side.
are each formed integrally. A shaft 1c is fixed to the camera body 1, and a lock pawl 7 is rotatably supported by this shaft 1c.
This lock pawl 7 is biased counterclockwise by a second spring 8, and one end 7a can be engaged with a stepped portion 2c formed on the lock lever 2, and the other end 7b is a combination screw. It has an attraction piece 7c that is attracted to the magnet 9. This combination magnet 9 is provided with a permanent magnet and an electromagnet in parallel, and when the electromagnet is not energized, the attraction piece 7c of the lock pawl 7 is moved toward the second spring 8 by the attractive force of the permanent magnet. The lock claw 7 is attracted to the combination magnet 9 against the urging force of the lock lever 2, and the end portion 7a of the lock pawl 7 engages with a stepped portion 2c formed on the lock lever 2. Further, when the electromagnet is energized, a magnetic field is generated in the opposite direction to that of the permanent magnet, and the magnetic fields in the opposite direction of the permanent magnet and the electromagnet cancel each other out, and the attractive force disappears, and the lock pawl 7 is moved to the second position. The end portion 7a is rotated counterclockwise by the biasing force of the spring 8, and the end portion 7a is separated from the stepped portion 2c.

A magazine bag 10 is detachably provided on the rear surface 1a of the camera body 1, and a film 10a is loaded inside the magazine bag 10. A pair of second locking claws 10b are formed on the surface of the magazine back 10 facing the camera body 1, and a pair of first locking claws 2b are formed on the lock lever 2 inside the camera body 1. can be engaged with each other through a pair of openings 1b formed on the back surface 1a of the camera body 1. Camera body 1 of the magazine bag 10
A light-shielding lid 11 that opens and closes an exposure opening formed on the side is provided in front of the film 10a loaded in the magazine bag 10 so as to be slidable in the left-right direction in the figure. for,
A first switch 12 is provided, the contact of which is closed by one end of the light-shielding lid 11 when the light-shielding lid 11 completely closes the opening.

This magazine bag 10 can be rotated 90 degrees to switch the exposure surface between vertical and horizontal positions, and in order to connect both poles of the first switch 12 to the camera body 1 in both of these positions, A pair of contacts 13 on the magazine back 10 side
However, there are two pairs of contacts 14 and 15 on the camera body side.
They are provided at positions forming an angle of 90°, and contacts 13 and 14 and contacts 13 and 15 are connected in both the vertical and horizontal positions, respectively. Both poles of the contacts at both the vertical and horizontal positions are combined into one and connected to both poles of the second switch 16 so as to correspond to the poles of the switch 12, respectively. This second switch 16 is connected to the release lever 4.
By holding the knob 4e and manually moving the release lever 4 to the left in the figure, the release lever 4 can be closed by the arm 4d. The first switch 12 and the second switch 16 are connected in series to open and close a circuit for applying the voltage of the power source 17 to the electromagnet of the combination magnet 9. Further, a normally open third switch 18 is provided in parallel with the first switch 12, so that the circuit can be opened and closed manually in place of the opening/closing signal for the light-shielding lid 11.

The operation of this embodiment configured as described above will be explained below. FIG. 1 shows the magazine bag 10 attached to the camera body 1, and the lock lever 2.
A first locking pawl 2b located on the right side in the figure and formed on the lock lever 2 engages with a second locking pawl 10a formed on the magazine back 10 side.
At this time, if the light shielding lid 11 provided on the magazine bag 10 is completely closed, the first switch 12
is closed, but the release lever 4 is biased to the right in the figure by the biasing force of the first spring 6, so the second switch 16 is open and the power supply 1
The voltage 7 is not applied to the electromagnet of the combination magnet 9. Therefore, the attracting piece 7c of the second locking claw 7 is attracted by the permanent magnet of the combination magnet 9, and is deflected clockwise against the biasing force of the second spring 8, so that one end of the locking claw 7 7a is held in a position where it engages with the stepped portion 2c of the lock lever 2 and locks the leftward movement of the lock lever 2, and the first locking claw 2b on the camera body 1 side
This locks the engagement of the second locking pawl 10b on the magazine back 10 side. In this case, the first switch 12 in the magazine bag 10 and the second switch 16 in the camera body 1 are contacts 13 and 14 when the magazine bag 10 is in the vertical position, and contacts 13 and 14 when the magazine bag 10 is in the horizontal position. 15 are connected to each other to form a circuit, and at intermediate positions other than the correct vertical and horizontal positions, the contacts are not connected and the circuit is open.

Next, the operation when removing the magazine bag 10 from the camera body 1 will be explained with reference to FIG. When the light-shielding lid 11 provided on the magazine back 10 is completely closed, if the release knob 4e is moved to the left in the figure against the biasing force of the first spring 6,
The left arm 4d of the release lever 4 presses the second switch 16 to close it, and the first switch 12 inside the magazine bag 10 is also closed, so the power supply 17 is closed.
voltage is applied to the electromagnet of the combination magnet 9, and a magnetic field in the opposite direction to the magnetic field of the permanent magnet is generated, so the magnetic fields are canceled out, and the lock pawl 7 is rotated counterclockwise by the biasing force of the second spring 8. The engagement between the right end 7a of the lock pawl 7 and the stepped portion 2c of the lock lever 2 is released, and this lock lever 2
can be moved to the left in the figure. In this state, the right end of the release knob 4e and the pin 5 are in contact with each other, so when the release knob 4e is further moved to the left, the lock lever 2 moves to the left through the long hole 2a guided by the pin 3. The first locking claw 2b formed on the lock lever 2 and the second locking claw 10b formed on the magazine back 10 are disengaged, and the magazine back 10 is removed from the camera body 1. be able to. In this case, the magazine bag 10 must be in the correct vertical or horizontal rotating position. Furthermore, when the light-shielding lid 11 is open, the first switch 12 is open and a closed circuit is not formed, so the attractive force of the permanent magnet of the combination magnet 9 remains, and the engagement between the lock pawl 7 and the lock lever 2 is prevented. It is not released and the magazine bag 10 cannot be removed from the camera body 1.

When the magazine back 10 is removed from the camera body 1, the voltage applied to the combination magnet disappears, and only the attractive force of the permanent magnet remains.
At this time, since the lock lever 2 is moving to the left, the lock pawl 7 is in contact with the protrusion 2d formed on the upper surface of the lock lever 2 near the right end in the figure, and the lock lever 2 is not locked. In this state, insert the magazine back 10 into the camera body 1.
If the release knob 4e is moved to the right, the lock lever 2 will move to the right through the elongated hole 4a and the pin 3, and the first locking pawl 2b formed on the lock lever 2 and the magazine back 10 will be moved to the right. The formed second locking pawl 10b engages, and the left end of the locking pawl 7 is pushed upward by the sloped portion 4c at the right end of the release lever 4, and the right end 7a of the locking pawl 7 engages with the stepped portion 2c of the locking lever 2. At the same time, the attraction piece 7c of the lock pawl 7 is attracted by the attraction force of the combination magnet 9, and the lock lever 2 is locked into the state shown in FIG.

The third switch 18 is used when you want to remove the magazine bag 10 from the camera body 1 when there is no light-shielding lid 11 on the magazine bag 10, or when a special need arises and you want to release the lock regardless of whether the light-shielding lid 11 is opened or closed. used manually.

As is clear from the above explanation, the magazine bag 10 cannot be removed from the camera body 1 unless the light shielding lid 11 is completely inserted into the magazine bag 10 and does not shield the film 10a inside the magazine bag 10 from light. .

In the above embodiment, the case where the magazine bag 10 rotates vertically and horizontally has been described, but when the magazine bag 10 does not rotate, two pairs of contacts 1 for circuit connection provided on the camera body side are used.
4 and 15 may be a pair.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the configuration of an embodiment of the magazine bag locking device according to the present invention when the magazine bag is locked;
FIG. 2 is a schematic diagram showing the configuration when the lock is released. 1... Camera body, 2... Lock lever, 2b
...First locking claw, 4...Release lever, 6...First spring, 7...Lock claw, 8...Second spring, 9...Combination magnet, 10...Magazine bag , 10b... second locking claw, 11... light shielding lid, 12... first switch, 13, 14, 15... contact, 16... second switch, 17... power supply, 18... The third switch.

Claims (1)

[Scope of Claim for Utility Model Registration] 1) In a locking device for a magazine bag, which is provided with a removable light-shielding lid that blocks light from the film exposure area and is removably attached to the camera body, a locking pawl formed on the magazine bag and A lock lever having a locking pawl that engages and disengages and is displaceably provided within the camera body, and a lock pawl that engages with and can be detached from the lock lever so as to prevent the lock lever from moving in the unlocking direction. , an electromagnet that acts on the lock pawl to separate the lock pawl from the lock lever, and an elongated hole on the lock lever that is spring-biased in the non-release direction and that engages with a pin on the lock lever. a release lever for moving the lock lever in the release direction, which is displaceable in the release direction; a first switch that closes when the light-shielding lid is inserted into the magazine bag; The first switch and the second switch are connected in series between the electromagnet and the power source through contacts provided on the camera body and the magazine bag, respectively. A magazine back locking device characterized by being connected. 2) The magazine bag locking device according to claim 1, wherein the electromagnet is a combination magnet.