JPS5937806B2 - Electric winder control switch mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a winder control switch mechanism provided on the camera side of a single-lens reflex camera to which an electric winder can be attached.

Conventionally, a control switch for an electric winder in a single-lens reflex camera has been provided in conjunction with a shutter or mirror operating member, which has complicated the structure and often caused failures.

Also, in a 35mm camera, if winding stops midway at the end of the film, the winder control switch on the camera side inserted into the power circuit of the electric winder is in the closed state, so overcurrent flows to the motor. There was a risk of burnout and rapid battery depletion. In view of the above points,
The electric winder control switch mechanism according to the present invention is an electric winder equipped with a self-holding switch that closes immediately after winding and opens at a fixed position, and a mechanical clutch that detects winding overload and shuts off winding. In a wearable single-lens reflex camera, a movable contact piece of a normally closed electric winder control switch, which is provided on the camera side and inserted in parallel with the above self-holding circuit into the power supply circuit on the electric winder side, is connected to the winding interlocking member and the mirror. Each of the charging members can be freely engaged and detached, and at the time of winding, the winding interlocking member opens the electric winder control switch at the beginning, and at the end, the mirror charging member maintains the open state and the shutter operation is completed. To provide an electric winder control switch mechanism having a simple structure and causing no inconvenience even when the film stops midway through winding, in which the electric winder control switch is closed at the beginning of the return of the mirror charge member. It is something.

Before explaining the embodiments of the present invention, we will explain the mechanism on the camera side that can be considered when the switch mechanism is simplified by relating the electric winder control switch to a charging member that is charged with energy by winding and released when the shutter operation is completed. This will be explained with reference to the attached drawings.

Figures 1 and 2 show the side views of the mirror box of a single-lens reflex camera. 1 is a mirror box, 2 is attached to mirror box 1 so as to be rotatable about axis 3, and holds a reflector at a 45-degree angle. A mirror holder that reciprocates between an oblique position and a horizontal position, and a mirror holder pin 4 is implanted in the side surface of the mirror box 1 through an opening (not shown) provided on the side surface of the mirror box 1. stand out. A charge lever 5 is rotatably mounted on the side of the mirror box 1 with a shaft 6, and a return spring 7 is engaged between it and a fixed part, and a charge lever 8 is provided on one side of the camera body and has a left-handling property. The winding interlock lever 9 moves to the left in conjunction with the winding operation and returns to the previous position when the winding operation is completed.
The locking lever is rotatably mounted at 0 and given right-handed rotation by the spring 11, and the distal end claw 9a locks the charge lever 5 in the stored state of the spring 7 and a spring 22, which will be described later. (See FIG. 2) When the shutter operation is completed, the shutter rear curtain interlocking member (not shown) rotates to the left to release the lock.

Reference numeral 12 indicates an aperture drive lever which is rotatably mounted on the side surface of the mirror box 1 with a shaft 13, and whose rotation in the counterclockwise direction is stopped by a fixed stopper 14; The aperture lever is attached so as to be slidable back and forth, and a spring 17 is engaged between it and the fixed part, and the aperture lever has a rightward movement as shown in the figure, and the bent part at the tip moves back and forth on the lens side. As a result, a pin 19 is engaged with one end of the aperture operating pin 18 which performs the aperture opening and aperture operation, and a pin 19 implanted at the other end engages with the free end of the aperture drive lever 12.

20 has one end rotatably connected to the middle part of the aperture drive lever 12 by a shaft 21, the other end forked part engages with the mirror holder pin 4, and the middle part near the shaft 21 engages with the charge lever 15. The operating lever is attached to one end of the main drive spring 22, and is provided with a claw portion 20a and a pin 23, and a roller 24 is attached thereto.

Reference numeral 25 designates a release lever which is rotatably mounted on the side surface of the mirror box by a shaft 26 and has a left-rotating behavior by a spring 27, with one end pawl 25a connecting to the pawl 20a of the operating lever 20.
The other end engages with a release button interlocking member (not shown).

Reference numeral 28 denotes a shutter start lever which is rotatably mounted on the side of the mirror box by a shaft 29, one end of which is engaged with the pin 23 of the operating lever 20, and the other end is engaged with a shutter leading curtain locking member (not shown). It is.

Reference numeral 30 designates a winder control switch according to the present invention, which is a normally closed switch that is provided on the side surface of the mirror box and has a fixed contact piece 30a and a movable contact piece 30b.
0b is driven by the charge lever 5 to open the winder power supply circuit when winding is completed.

This first embodiment has the above-described configuration, and since the winder control switch 30 is in the closed state when the shutter operation is completed as shown in FIG. 1, winding by the electric winder (not shown) is started and the The interlocking lever 8 moves to the left, rotates the charge lever 5 to the right against the return spring 7 and the driving spring 22, and locks the lower end of the charge lever 5 with the locking lever 9.
(see Fig. 2), the winding interlocking lever 8 returns, and at the same time, the movable contact piece 30a of the winder control switch 30 is pressed against the inner surface of the charge lever 5 and released, and the winding is started. Complete.

Next, when the release lever 25 rotates to the right due to the release operation, the locking of the operating lever 20 is released, so the operating lever 20 is driven by the main drive spring 22, and the main drive spring 22
The aperture drive lever 12, which is close to the engagement point, first rotates to the right about the shaft 13, and its free end presses the pin 19 to the left, causing the aperture lever 15 to move to the left against the spring 17, thereby reducing the aperture. The aperture is narrowed down to a predetermined value by pressing the pin 18 toward the lens. When the narrowing down is completed, the narrowing down pin 18 and the narrowing down lever 15 are in a stopped state, so the aperture drive lever 12 is also stopped, the operating lever 20 is rotated to the left about the shaft 21 by the main driving spring 22, and the mirror holder pin 4 is driven. The mirror holder 2 is flipped up clockwise around the shaft 3. By turning the differential lever 20 to the left, the pin 23
turns the shutter start lever 28 to the left, and the lower end drives a shutter leading curtain locking member (not shown) to release the locking of the leading shutter curtain, and the shutter leading curtain runs. Towards the end of the shutter operation, an interlocking member (not shown) interlocked with the shutter trailing curtain rotates the locking lever 9 to the left, so the charge lever 5 is rotated to the left by the return spring 7, and a part of it contacts the roller 24 and is activated. The lever 20 is returned to its initial state, the mirror holder 2 is lowered, and the aperture drive lever 12 is rotated to the left, the aperture lever 15 and the aperture pin 18 are moved to the right, and the aperture is opened. On the other hand, at the same time as the charge lever 15 returns, the winder control switch 30 is released from the restraint by the charge lever 15 and is closed, and the electric winder is energized again and winding is immediately started, allowing continuous photographing. In addition, although the spring 7 and the spring 22 are used in the figure, the reciprocating operation may be performed using only the driving spring 22.

In addition, in the above configuration, a normally closed type winder control switch is used, which is opened when winding is completed, but in this case, in a 35 mm camera, the circuit is closed even if winding stops midway at the end of the film. Since the overcurrent is allowed to flow through the motor, it is necessary to turn off the main switch or take measures to shut off the overcurrent.

As shown in FIG. 3, when a normally open type winder control switch 30 is used, which is closed at the end of the left rotation of the charge lever 5 when the shutter operation is completed, and is opened at the same time as the start of winding, the winder side A self-holding switch that is open at the normal position (start position) and closed immediately after the start of winding is provided in the winder power supply circuit in parallel with the above switch 30, and a mechanical clutch that detects overload and shuts off winding is also used. By doing so, even if the winder stops halfway when the film is finished, the winder side can always automatically stop at a fixed position. However, in the example shown in FIG. 3, the switch 307 is closed at the beginning of the return of the charge lever 5 immediately after the shutter operation ends in the cases shown in FIGS. 1 and 2.
This is at the end of the return of the lever 5, and there is a disadvantage in terms of the number of frames taken per second during continuous shooting. FIG. 4 shows an embodiment of the present invention that improves the above-mentioned drawbacks, and 31 is the bottom surface of the camera body;
32 is a hoisting plate that moves together with the hoisting lever shaft; 33 is a hoisting interlocking member whose one end is pivotally connected to the hoisting plate 32 through a shaft 34, and whose other end is a hoisting interlocking member that is slidable in the longitudinal direction; A hoisting link 37 (corresponding to the hoisting interlocking lever 8 in FIGS. 1 and 2) is pivotally connected to the plate 35 by a shaft 36, and is rotatably attached to the bottom surface 31 of the camera body by a shaft 38, and rotates the spring 39. A mirror charge lever 14, which is a mirror charge member that is engaged and has a right-handed rotation behavior, and whose tip claw portion 37a is attached to the side surface of a mirror box (not shown).
0 (corresponding to the charge lever 5 in FIGS. 1 and 2); 1
, corresponding to the locking lever 9 in FIG. Section 42
45 is a normally closed type winder control switch having a fixed contact piece 45a and a movable contact piece 45b, and the movable contact piece 45b is connected to the winding interlocking lever 35 and The mirror charge levers 40 are respectively engaged and disengaged.

In this case, the electric winder also includes a self-holding switch that closes immediately after the start of winding and a mechanical clutch (not shown) that detects overload in winding and shuts off winding (cuts off the connection between the motor and the winding member). ), and both control switches are inserted in parallel into the winder power supply circuit. Now, from the state where the shutter operation is completed as shown in the figure, the winding plate 32 is
When rotated within 10 degrees clockwise, the winding interlocking plate 35 moves to the right via the winding link 33, and at the beginning, the movable contact piece 45b is lifted and disengaged from the fixed contact 45a, and the winder control switch on the camera side is activated. 45 is opened, but at this time, the self-holding switch (not shown) on the winder side is already closed, so winding continues, and the right movement of the winding interlocking plate 35 causes the shutter winding member (not shown) to be moved by the rack teeth. is driven to wind up the focal plane shutter, and as the mouth L-ra 41 engages with the bent surface portion 37b of the winding interlocking lever 37, the winding interlocking lever 3
7 rotates to the left against the spring 39 with the mirror charge lever 40 attached to the tip claw portion 37a, and the mirror charge lever 40
is hooked onto the claw portion 42a of the locking lever 42, and then the hoisting plate 3
2 is reversed, the winding interlocking plate 35 returns, and the winding interlocking lever 37 is rotated to the right by the spring 39, but the movable contact piece 45b of the winder control switch 45 engages with the mirror charge lever 40. Then, the switch 45 is held in the open state, and the winder side self-holding switch is opened and winding is completed.

Next, use the release operation to raise the mirror, narrow down the lens,
When the shutter operation is completed and the locking lever 42 rotates to the left against the spring 44, the locking by the claw portion 42a is released and the mirror charge lever 40 is returned to its initial position by a return spring (not shown). Mirror is restored.

At the same time, at the beginning of the return of the mirror charge lever 40, the restraint of the movable contact piece 45b is released, the winder control switch 45 is closed, and winding is immediately started, so that continuous photographing is performed at high speed. In the above embodiment, the winder control switch is opened and closed by the mirror charge member itself, but it may be opened and closed by an operating member connected to the mirror charge member or an energy storage member similar to the mirror charge member.

As described above, according to the present invention, a normally closed winder control switch inserted in parallel with a self-holding switch in the power supply circuit of an electric winder is connected to a winding interlocking member that reciprocates by winding, and the winding interlocking member. It can be freely engaged and detached from each of the mirror charge members that store energy, and is released by the winding interlocking member at the beginning of winding, and after the winding is completed and the winding interlocking member returns, it is opened by the mirror charge member. Even if the film stops mid-winding when the film is finished, the self-holding switch and mechanical clutch installed on the electric winder side will allow the winder side to always rotate to the fixed position, preventing overload from the motor. Burnout due to current flow can be prevented. Also,
After the shutter is activated, the winder control switch is closed at the beginning of the return of the mirror charge lever and the next winding starts, increasing the number of frames taken per unit second and allowing continuous shooting at high speed. Furthermore, since the winder control switch is opened and closed by a mirror charge member,
Compared to conventional devices whose opening and closing are related to shutter or mirror actuating members, the opening and closing mechanism has an excellent effect of being extremely simplified.

[Brief explanation of drawings]

Fig. 1 is a side view of a mirror box in a state where the shutter of a single-lens reflex camera is completed, which is considered to simplify the electric winder control switch, Fig. 2 is a side view of the mirror box in a state where winding is completed, and Fig. 3 are the first and second
FIG. 4 is a side view of the main parts of a mirror box similar to FIG. 1, with some of the mechanisms shown in the drawings changed, and FIG. 4 is a bottom view of a camera body showing an embodiment of the present invention. 5, 40...Charge lever one, 7...
Return spring, 8, 37...Hoisting interlock lever, 20
...Actuation lever, 22... Main drive spring,
30, 45... Winder control switch.

Claims (1)

[Claims] 1. In a single-lens reflex camera that can be equipped with an electric winder, which is equipped with a self-holding switch that closes immediately after winding starts and opens at a fixed position, and a mechanical clutch that detects overload and shuts off winding, it is linked to winding. A movable contact piece is provided with a winding interlocking member that reciprocates and a mirror charge member that is driven by the winding linking member and is locked in the stored position, and a movable contact piece that is connected to the mirror charge member and the winding interlocking member. When hoisting, a normally closed motor is engaged with the hoisting interlocking member to be in the open state at the beginning, and is engaged with the mirror charge member at the end of the winding to be held in the open state. An electric winder control switch mechanism characterized in that a winder control switch is provided in a power supply circuit of an electric winder connected in parallel with the self-holding switch.