JPH0228511Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a click mechanism for a return knob shaft in an automatic rewind device using a motor drive.

The driving force transmission mechanism of the motor drive in conventional automatic rewinding devices is configured such that the driving force is transmitted to the film shaft through a hole drilled directly at the bottom of the film shaft in the cartridge chamber of the body. A light shielding plate was provided to avoid light leakage.

When rewinding a film, the rewinding shaft of the rewinding mechanism and the film shaft of the cartridge are connected by having the rewinding shaft protrude toward the film shaft side.

Therefore, when the shafts are connected, the light shielding plate must be retracted, which increases the amount of protrusion of the unwinding shaft and complicates the mechanism.

In order to solve this problem, conventionally, an automatic rewinding device has been implemented in which driving force is transmitted from a return knob shaft located above the cartridge chamber. According to this, since the rewinding shaft is disposed outside the cartridge chamber or at a position where it does not interfere with the cartridge, measures against light leakage are simplified, a light shielding plate is not required, and the amount of protrusion can be reduced.

FIG. 1 is a sectional view of a conventional automatic rewinding mechanism configured to receive the driving force of a motor drive from the rewinding knob shaft. A rewinding shaft 1 installed on the side of the patrone chamber from a motor drive (not shown)
The driving force is transmitted to. A third gear 2 is attached to the upper end of the rewinding shaft 1. During rewinding, the rewinding shaft 1 rises and the clutch mechanism A formed by the third gear 2 and the second gear 3 is coupled, and the clutch mechanism A is connected to the first gear 4a via the third gear 2 and the second gear 3. Driving force is transmitted.

FIG. 3 is a plan view showing how the first gear 4a, second gear 3, and third gear 2 are coupled. 1st gear 4
A is formed integrally with the lower part of the cylindrical shaft 4, and the cylindrical shaft 4 is rotatably supported by a bearing portion 11 fixed to the body, and is provided with a slot 8 as shown in FIG. A return knob shaft 6 has a return knob shaft 10 fixed to its upper end and a film shaft engaging portion 6b for engaging a film shaft (not shown) in a cartridge chamber at its lower end. A slot 6a is provided along the axial direction. A locking plate spring 5 for engaging the cylindrical shaft 4 and the return knob shaft 6 is attached to the slot 6a by a screw 7.
It is attached by. The tip of the locking leaf spring 5 engages with the slot 8 of the cylindrical shaft 4, and the cylindrical shaft 4
and the return knob shaft 6 are rotatable together.

Figure 2 shows that the locking leaf spring 5 is located at a slot 8 in the cylindrical shaft 4.
FIG. This leaf spring 5 also serves as a click mechanism, and when the return knob 10 is pulled upward when inserting or removing the film cartridge, the engagement between the leaf spring 5 and the slot 8 is forcibly released, and the return knob 10 is released. be lifted up.
In this state, the film shaft engaging portion 6b is disengaged from the film shaft, so that the cartridge can be taken in and out.

This rewinding mechanism has a slot 6a in the rewinding knob shaft 6.
, and the plate spring 5 is provided, so the diameter of the return knob shaft 6 is thicker than that of a normal shaft, and the second gear 3,
A space is required to accommodate the first gear 4a.
Further, since film sensitivity, shutter speed changing material, etc. (not shown) are disposed around the bearing portion 11, it is necessary to secure a space around the bearing portion 11.

Furthermore, the click mechanism shown in FIG. 1 has a problem in that the click feeling when the return knob is pulled up is generally not good.

The purpose of this invention is to create an automatic rewind mechanism that takes in the transmitted driving force of the motor drive from the return knob shaft.The return knob shaft can be made thinner to save space around it, and it also provides a good click feeling when the return knob is pulled up. The object of the present invention is to provide a return knob shaft click mechanism.

In order to achieve the above object, the return knob shaft click mechanism of the automatic rewinding device according to the present invention has a cylindrical shaft having a through hole bored in the upper part of the cylinder from the outer periphery and rotated by receiving rotational force from the rewinding drive source. ,
It is slidable in the axial direction, and is inserted through the cylindrical shaft so as to engage in the rotational direction, so that it rotates together with the cylindrical shaft, and transmits rotational force to the film shaft of the cartridge to rotate the film. is wound around a return knob shaft having a recess formed in a position facing the through hole, and a cylindrical shaft having the through hole formed therein, and the return knob shaft is clicked through the through hole. It consists of a suppressing means for stopping.

According to the above structure, the click feeling is good, and since the diameter of the return knob shaft can be made thinner, a space can be taken around the bearing part, and the object of the present invention is completely achieved.

Hereinafter, the present invention will be explained in more detail with reference to the drawings. FIG. 4 is a diagram showing an embodiment of the rewinding knob shaft click mechanism according to the present invention, and is a sectional view of the rewinding mechanism section. The rewinding shaft 1 passes by the side of the cartridge chamber 25 and reaches the upper part of the cartridge chamber. This rewinding shaft 1 can be slid up and down, and a spring 24 provides play in the joint in the center so that the gears can mesh smoothly, and a coupler 26 that meshes with the drive shaft of a motor drive (not shown) is attached to the lower end. A third gear 12 forming a clutch mechanism B that meshes with a gear etc. for rotating the return knob shaft is attached to the upper end. The driving force of the third gear 12 is transmitted to the first gear 14a via the second gear 13. The cylindrical shaft 14 has a through hole 14b provided in its upper part, and its lower part is integrated with the first gear 14a. Further, a connecting plate 15 for connecting to the return knob shaft 16 is fixed to the lower side of the first gear 14a. The cylindrical shaft 14 is inserted into a bearing portion 17 attached to a base plate 21 fixed to the body die cast 22, and is rotatably supported.
A film shaft engaging portion 28 for engaging with a film shaft (not shown) of the cartridge chamber 25 is attached to the lower part, a return knob 20 is attached to the upper part, and the return knob shaft 16 inserted into the cylindrical shaft 14 is located at the center thereof. A slot 16a for engaging with the connecting plate 15 at the
Further, a recess is formed at a position corresponding to the through hole 14b. Through hole 14 of cylindrical shaft 14
A ring-shaped leaf spring 18 is wound around the b-forming portion, a ball 19 is inserted into the through hole 14b, and the ball 19 is pushed down by the ring-shaped leaf spring 18 so that it falls into the concave portion of the return knob shaft. The pressing means is composed of a ring-shaped spring 18 and a ball 19. During rewinding, the drive shaft of the motor drive protrudes and couples with the coupler 26, the rewinding shaft 1 is raised, and the clutch mechanism B is connected. Therefore, the driving force of the motor drive is provided by the coupler 26, the rewinding shaft 1, the third gear 12, the second gear 13, and the first gear 14.
a, it is transmitted to a film shaft (not shown) via the connecting plate 15, the return knob shaft 16, and the film engaging portion 28.

When loading or unloading the film, use the rewind knob 20.
is pushed up, the connection between the ball 19, which is normally pressed against the return knob shaft by the ring-shaped leaf spring 18, and the recess is released, and the return knob shaft 16 is pulled up. As a result, the film shaft engaging portion 28 is separated by the film shaft (not shown).

FIG. 5 is a perspective view showing the state of engagement between the return knob shaft and the connecting plate. There is a protrusion 1 on the inside of the connecting plate 15.
5a, and this protrusion 15a and return knob shaft 16
The slot 16a is engaged. As described above, when the return knob shaft moves up and down when loading and unloading the film, the protrusion 15a slides within the slot 16a.

FIG. 6 is a view showing the pressing means of the click mechanism of FIG. 4. The ring-shaped leaf spring 18 is attached to the cylindrical shaft 14
The double portion of the leaf spring 18 is wound 1 1/4 times around the ball 19 and pushes the ball 19 inserted into the through hole. In order to securely hold the ball 19 in this state, the leaf spring 19 is provided with a V-shaped recess 18a. FIG. 6b shows an embodiment of this configuration, and the recess can be a U-shaped recess 30a as shown in FIG. 6c. In addition, in order to prevent the cylindrical shaft 14 from shifting in the axial direction, a shallow groove 14C is formed on the outer periphery of the cylindrical shaft 14 as shown in FIG. 6a.
is provided, and a ring-shaped leaf spring 18 is fitted into that portion.

FIG. 7 is a perspective view showing only the ring-shaped leaf spring taken out.

FIG. 8 is a diagram showing another embodiment of the suppression means. This is the sixth through hole drilled in the cylindrical shaft 31.
It is larger than the case shown in the figure, and is configured so that the ring-shaped leaf spring 32 is deformed inward without using a ball, and the deformed portion falls into the through hole of the cylindrical shaft 31 and the recess of the return knob shaft. .

As explained above in detail, the return knob shaft click mechanism according to the present invention is equipped with a compression means such as a ring-shaped leaf spring on the return knob shaft directly below the return knob, so the shaft diameter of the return knob shaft is compared with that of the conventional one. death,
It can be made considerably smaller and therefore more space can be taken up around the bearing part. In addition, a pressure means such as a ring-shaped spring is attached to the top of the cylindrical shaft,
Since the protrusion of the ball or ring-shaped spring is configured to fall into the recess provided in the return knob shaft, there is an advantage that the click feeling is improved compared to the conventional one.

Furthermore, in the assembly process of the unwinding mechanism, when inserting a cylindrical shaft into the bearing part and sending it to the subsequent process, it was conventionally necessary to pay attention to the cylindrical shaft falling off, but with the present invention, the cylindrical shaft Since the pressing means for clicking is provided at the upper part, this pressing means prevents the cylindrical shaft from falling off, thereby reducing unnecessary care by the operator.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the configuration of a conventional automatic rewinding device, Fig. 2 is a sectional view of the return knob shaft, Fig. 3 is a plan view showing the gear mechanism of the automatic rewinding device, and Fig. 4 is the present invention. 5 is a cross-sectional view showing an embodiment of the return knob shaft click mechanism in an automatic rewinding device according to 2007, FIG. Figures illustrating details of the mechanism, Figure a is a partial perspective view, Figures b and c are partial plan views. Fig. 7 is a perspective view of a ring-shaped leaf spring of the click mechanism, and Fig. 8 is a diagram showing details of another embodiment of the click mechanism, in which figure a is a partial perspective view and figure b is a partial plan view. . 1... Rewinding shaft, 2, 12... Third gear, 3,
13...Second gear, 4a, 14a...First gear,
5... Locking leaf spring, 6, 16... Return knob shaft, 6
b, 28...Film shaft engaging portion, 7...Screw, 8
...Slot, 10,20...Return knob, 11,
17... Bearing part, 15... Connection plate, 18, 30,
32...Ring-shaped leaf spring, 19...Ball, 21
...Main plate, 22...Body die-cast, 24...
...Spring, 25...Patrone room, 26...Coupler.

Claims (1)

[Scope of utility model registration request] A through hole is bored in the upper part of the cylinder from the outer periphery, and the cylindrical shaft is rotated by receiving rotational force from the rewinding drive source, and is slidable in the axial direction and engaged in the rotational direction. a return knob shaft that is inserted through the cylindrical shaft to rotate together with the cylindrical shaft, transmits rotational force to the film shaft of the cartridge to rewind the film, and has a recess formed at a position facing the through hole; A return knob shaft click mechanism in an automatic rewinding device, comprising: a pressure means wound around the outer periphery of a cylindrical shaft in which the through hole is formed, and click-stops the return knob shaft through the through hole.