JPH079141Y2 - Overcharge mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an overcharge mechanism for a device that requires a maximum charge torque during charging.

(Prior Art) Generally, as a charging mechanism that requires overcharging, two charging members are formed, and the two charging members are
It is known that an overcharge spring, which generates a torque equal to or more than the maximum charge torque required during charging, holds the bias. (Hereinafter, the torque generated by the overcharge spring is referred to as the force of the overcharge spring.) (Problems to be solved by the invention) However, in the above overcharge mechanism, the torque required for overcharging is the force of the overcharge spring. It is necessary to be above, and when lowering the charge torque, the force of the overcharge spring is a large load. In this overcharge mechanism, if the force of the overcharge spring is reduced to be equal to or less than the maximum charge torque, the torque is insufficient at the time when the maximum charge torque is required and charging cannot be performed.

Therefore, an object of the present invention is to provide an overcharge mechanism capable of reducing the force of the overcharge spring while maintaining the effect of the overcharge mechanism.

(Means for Solving the Problems) The present invention has been made to achieve the above object, and requires a maximum charge capacity during the charging process and an overcharge smaller than the maximum charge capacity during the overcharge process. In an overcharge mechanism used for a device that requires force, a first charge member movable in a charge direction by a driving force of a drive system, and the first charge member described above.
A second charge member that is movable relative to the charge member and transmits the force received from the first charge member to the device side; and the second charge with a force smaller than the maximum charge amount and larger than the overcharge amount. An overcharge spring for urging a member in the charging direction; a first restricting portion for restricting a movable range of the second charging member in the charging direction relative to the first charging member; A second restricting portion for restricting a movable range of the charging member relative to the first charging member in a direction opposite to the charging direction, and during the charging process, the second charging member is In the state of being regulated by the second regulating portion, the movable body moves integrally with the first charge member, The second charge member by the biasing force of the over-charge spring, characterized in that the relative movement to a position which is restricted by the first restricting portion.

(Operation) At the initial point of the charging process in which the charging force is smaller than the force of the overcharge spring, the second charging member moves integrally with the first charging member while being regulated by the first regulating portion. When the amount of charge exceeds the amount of force of the overcharge spring, the second charge member relatively moves against the biasing force of the overcharge spring to a position regulated by the second regulator. After the second charge member reaches the second restricting portion, the second charge member moves integrally with the first charge member while being restricted by the second restricting portion. Since the force of the overcharge spring is smaller than the force of the overcharge, when the overcharge process is started, the second charge member, which has been moved to the position regulated by the second regulating portion in the charge process, is urged by the overcharge spring. It relatively moves again to the position regulated by the first regulation portion.

Subsequently, in the overcharge region, the required charge torque is smaller than the force amount of the biasing member, so the force from the drive system is transmitted to the second charge member and the device via the biasing member to perform charging.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 6 are views for explaining the operation of an embodiment in which the present invention is applied to a shutter charge mechanism of a camera, FIG. 7 is a view for explaining the shutter charge operation, and FIG. 8 is a shutter charge. It is a charge torque diagram in operation.

In FIG. 1, (1) is a shutter charge lever,
(2) is an overcharge lever, both of which are rotatably attached to the shaft (3). The shutter charge lever (1) has a boss (1) that abuts against the set lever (4) on the shutter side and pushes this set lever (4).
a), and the other end has a boss (1b) on which an overcharge spring (6) is hooked. The overcharge lever (2) has a boss (2a) that abuts the drive lever (5) that transmits the force of a drive system (not shown), and a boss (2b) that restricts the movement of the shutter charge lever (1),
There is (2c). The space between the bosses (2b) and (2c) is the shutter charge lever (1) when overcharging.
It suffices if the interval is slightly wider than the distance at which is pushed counterclockwise. The overcharge spring (6) is held by the shaft (3) and the bosses (1b), (2b), and biases and holds the shutter charge lever (1) clockwise with respect to the overcharge lever (2). . Pin (1
2) prohibits the clockwise rotation of the shutter charge lever (1) when the shutter charge is completed.

Further, (14) is a locking lever, which is rotatably attached to a shaft (15). An attraction piece (17) is provided at one end of the locking lever (14), and when the electromagnet (18) is energized, the locking lever (14) resists the urging force of the spring (16). Rotate clockwise. The pin (19) restricts the clockwise rotation of the locking lever (14). The arm (2d) of the overcharge lever (2) is brought into contact with the locking lever and locked after the shutter charge is completed,
Hold the shutter charged. Locking lever (1
4), the function of the arm (2d) will be described later.

In the present invention, the torque (hereinafter referred to as the force) generated by the overcharge spring (6) is lower than the maximum shutter charge torque as shown in FIG. It is set to be higher than the charge torque.

Here, the shutter charge operation and the shutter charge torque will be described with reference to FIGS. 7 and 8.

A configuration using a cam mechanism is well known for charging the shutter, as shown in FIG. 7, the same members as those in FIG. 1 are designated by the same reference numerals.
The set lever (4) is rotatably attached to the shaft (7),
It rotates counterclockwise as the boss (1a) of the shutter charge lever (1) is pushed up. The set lever (4) is biased clockwise by a spring (11). (8) is a shutter drive lever, which is pivotally attached to a shaft (9) and is urged counterclockwise by a drive spring (10). Further, a boss (8a) is provided at one end on the opposite side of the shaft (9) so as to abut the cam surface (4a) of the set lever (4). The cam surface (4b) of the set lever (4) is a substantially concentric surface that holds the shutter drive lever (8) in the overcharge region.

FIG. 8 is a diagram showing the shutter charge torque applied to the set lever (4) when the shutter is charged.

FIG. 7 (a) shows the state before the shutter charge is started by the shutter drive lever (8), and corresponds to the section (a ') in FIG. Until the set lever (4) comes into contact with the boss (8a) of the shutter drive lever (8), the biasing force of the spring (11) acts on the set lever (4) only slightly.

When the boss (1a) of the shutter drive lever (1) further rotates the set lever (4) counterclockwise, the cam surface (4a) of the set lever (4) is changed as shown in FIG. 7 (b). ) Contacts the boss (8a) of the shutter drive lever (8). This state corresponds to the section (b ') in FIG. 8, and the shutter charge torque generated by the drive spring (10) increases with the rotation of the set lever (4).

As shown in FIG. 7 (c), when the contact between the set lever (4) and the boss (8a) of the shutter drive lever (8) reaches the boundary between the cam surfaces (4a) and (4b) (first After (c ') in FIG. 8, the shutter charging lever (8) is overcharged (section (d') in FIG. 8).

As shown in FIG. 7 (d), since the cam surface (4b) is substantially concentric, the shutter charge torque is reduced in the overcharge region.

Next, the operation of the overcharge mechanism of this embodiment will be described.

FIG. 1 shows the operation start state of the overcharge mechanism,
The drive lever (5) starts to move to the left by the drive system (not shown). Since the drive lever (5) moves by pushing the boss (2a), the overcharge lever (2) rotates clockwise about the shaft (3), but the force of the overcharge spring (6) is greater than the shutter charge torque. Since it is large (section A in Fig. 8), the shutter charge lever (1) also rotates clockwise due to the urging force of the overcharge spring (6), and the shutter charge is charged via the boss (1a) and the set lever (4). Is started.

FIG. 2 shows the initial state of section B in FIG. 8, and since the shutter charge torque is larger than the force of the overcharge spring (6) in section B, the overcharge lever (2) rotates clockwise. However, the shutter charge lever (1) cannot rotate the set lever (4) because it cannot be pushed up.

In FIG. 3, when the overcharge lever (2) further rotates clockwise, the set charge lever (4) cannot be pushed up, and the shutter charge lever (1) that was in the stopped state is replaced by the overcharge lever (2). ) (2c) comes into contact (the beginning of section B in FIG. 8).

Then, in FIG. 4, further overcharge lever (2)
When is rotated, the boss (2c) pushes the shutter charge lever (1) to restart the clockwise rotation of the shutter charge lever (1). Since the torque possessed by the drive lever (5) is larger than the maximum value of the shutter charge torque, the shutter charge in the section B of FIG. 8 can be easily performed.

Further, when the shutter charge continues and reaches the section C in FIG. 8, the shutter charge torque becomes smaller than the force of the overcharge spring (6). Therefore, the shutter charge lever (1) is urged by the urging force of the overcharge spring (6). Rotates until it contacts the boss (2b) and charges the set lever (4). This section is the overcharge region of the shutter drive lever (8) as described above.

In this state, when the shutter charge lever (1) comes into contact with the pin (12) as shown in FIG. 5, the shutter charge lever (1) is prohibited from rotating in the clockwise direction and the shutter charge by the set lever (4) is charged. Is completed.

FIG. 6 shows the overcharge operation of the overcharge mechanism by the overcharge lever (2).
From the state shown in FIG. 5, the overcharge lever (2) is further rotated clockwise against the force of the overcharge spring (6).

As described above, even if the force of the overcharge spring (6) is set smaller than the maximum value of the shutter charge torque, the shutter charge torque is larger than the force of the overcharge spring (6) (see FIG. 8B).
Section), overcharge lever (2) boss (2
By c), the force from the drive system is directly transmitted to the shutter charge lever (1) without passing through the urging force of the overcharge spring (6), so that the shutter charge is possible.

Also, in the final step of shutter charging, the required shutter charge torque is lower than the force of the overcharge spring (6), so the shutter charge lever (1) is relatively initial with respect to the overcharge lever (2). Return to the position and guarantee the overcharge operation after the shutter charge is completed.

Next, the operation of the arm (2d) of the overcharge lever (2) and the locking lever (14) will be described. 1 to 6
The electromagnet (18) is never energized during the section shown in the figure. Therefore, the locking lever (14) is only urged clockwise by the spring (6),
When the arm (2d) rotates with the clockwise rotation of the overcharge lever (2), the locking lever (14) resists the urging force of the spring (16), as shown in FIGS. 2 and 3. And rotate counterclockwise. When the contact with the arm (2d) is broken, the locking lever (14) returns to the initial position (see FIG. 6).

FIG. 9 shows that after charging by the drive lever (5) is completed,
It is a figure which shows the state which the drive lever (5) returned to the initial position. When the drive lever (5) moves away from the boss (2a) of the overcharge lever (2), the shutter charge lever (1) and the shutter charge lever (1) are moved by the urging force of the spring (11) acting on the set lever (4) shown in FIG. The overcharge lever (2) rotates counterclockwise, and the overcharge lever (2) stops at the position where the arm (2d) comes into contact with the end surface of the locking lever (14). The shutter charge lever (1) has the boss (2b) of the overcharge lever (2) due to the force of the overcharge spring (6).
It is held at the position where

In this state, the shutter curtain (not shown)
It is in a state of being mechanically held by 4). When the release operation is started, the shutter curtain is electrically held by an electromagnet (not shown) by a known method. Then, the electromagnet (18) is energized, and the attraction piece (1
7) is attracted to the electromagnet, the locking lever (1
4) rotates counterclockwise. Therefore, the locking lever (1
4) and the arm (2d) of the overcharge lever (2) are released, and the overcharge mechanism returns to the initial position.
Finally, the electric shutter curtain is released and the release operation is completed.

The overcharge mechanism of the present invention has been described above according to the embodiment using the shutter charge mechanism of the camera. However, in the conventional camera having automatic winding, the force of the overcharge spring (6) is seen from the drive system. It was the largest foot cassette, which was an obstacle to speeding up frame advance. Therefore, by using the overcharge mechanism of the present invention, the amount of force of the overcharge spring (6) can be reduced, and the speed of frame advance can be increased.

Needless to say, the overcharge mechanism of the present invention can be used in addition to the shutter charge mechanism of the camera.

Further, the overcharge spring (6) is not limited to the return spring, and a coil spring or the like can be used.

(Effect of the Invention) According to the overcharge mechanism of the present invention, the force generated by the overcharge spring is made smaller than the maximum charge required during the charging process, so that the charge of the drive system can be reduced. . Moreover, after the amount of charge exceeds the amount of the overcharge spring, the second charge member moves relative to the first charge member in the direction opposite to the charge direction to the position where the second restriction member is restricted. Therefore, even if the charge force exceeds the force of the overcharge spring, the second
Since the charging member moves integrally with the first charging member while being regulated by the second regulating portion, the charging process can be continued without difficulty. In the overcharge process, the second charge member relatively moves again to the position where it is regulated by the first regulation portion by the urging force of the overcharge spring, so that the overcharge operation is guaranteed.

[Brief description of drawings]

1 to 6 are block diagrams showing the operation of an embodiment of the present invention, FIG. 7 is a block diagram showing the operation of the shutter charge mechanism, FIG. 8 is a charge torque diagram in the shutter charge operation, and FIG. The figure is a diagram showing the place where the charging operation by the drive system is completed. 1 ... second charge member, 2 ... first charge member, 6 ... biasing member, 2b, 2c ... regulating member.

Claims (1)

[Scope of utility model registration request] 1. An overcharge mechanism for use in a device that requires a maximum charging power during the charging process and requires an overcharge power smaller than the maximum charging power in the overcharging process in a charging direction by a driving force of a driving system. Movable first
A second member that is movable relative to the charging member and the first charging member, and that transmits the force received from the first charging member to the device side.
A charge member, an overcharge spring that biases the second charge member in the charge direction with a force smaller than the maximum charge amount and larger than the overcharge amount, and the first charge member of the second charge member. On the other hand, a first restricting portion that restricts a relative movable range in the charging direction, and a movable range of the second charging member relative to the first charging member in a direction opposite to the charging direction. The second charge member is moved integrally with the first charge member in a state of being regulated by the second restrictor during the charging process, and the overcharge process is performed. In the above, the second charge member is moved to the first restriction portion by the urging force of the overcharge spring. Over charge mechanism, characterized in that the relative movement to a position to be regulated me.