JPH0314569Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a crimping pin having an improved crimping structure for crimping and connecting camera shutter blades.

[Prior art]

To increase the strobe synchronization speed, it is necessary to increase the speed of the shutter blade, and to incorporate a motor drive mechanism, it is necessary to further reduce the force required to set the shutter. For this reason, in recent years, efforts have been made to make the shutter blade even lighter. , aluminum and plastic have come to be used as materials. However, these materials have significantly lower strength than iron, so a shutter blade made of this type of material can be used for example in the form of a collar part a and a large diameter part b as shown in Figure 3.
When caulking is performed using a general caulking pin consisting of a small diameter portion c and a small diameter portion c, the expansion of the small diameter portion c may push the blade caulking hole d wide, or the periphery of the hole d may become soaked. If durability is impaired, problems may occur.

In order to solve this problem, Japanese Utility Model Application Publication No. 59-82226 proposes a caulking pin in which a relief groove is provided on the circumference of the small diameter portion facing the blade caulking hole. Even though
Caulking causes the small diameter part to buckle from the base, so if the shutter blade is weak in strength, the periphery of the caulking hole will be compressed at the step between it and the large diameter part. The problem still persists.

In addition, according to the process confirmed by the applicant through mass production, in addition to the pressing force acting in the thickness direction of the plate due to pressing and dipping, the portion that is fitted with the plate bulges, causing an expansion force to act. It has been confirmed that this can significantly deform the shutter blades. In order to prevent the shutter blade from being deformed due to this bulge, if the fit clearance is increased, positional accuracy cannot be ensured due to the unevenness of caulking, and furthermore, the bonding force is reduced due to the unevenness.

Furthermore, in the caulking structure described in Japanese Utility Model Application Publication No. 53-79972, the shaft end is made smaller in diameter than the rivet hole in order to avoid scraping the clutch cover during disassembly. ), the thickness of the caulked portion (plate) is required because the blade is indirectly caulked, and caulking shutter blades has many problems in terms of light leakage and space.

In other words, when multiple shutter blades are overlapped one after another and caulked together, caulking parts (plates) are interposed between each shutter blade, and light leaks from this gap, and the entire shutter blade becomes thick. This is not desirable due to the camera configuration.

〔the purpose〕

This invention was made in view of this problem,
The object is to provide an improved caulking pin that does not generate unnecessary squeezing force and spreading force on the edge of the caulking hole of the plate material during caulking.

[Means to achieve the purpose]

In other words, the present invention aims to achieve this purpose.
A medium diameter portion for supporting a shutter blade to be coupled is integrally formed in the caulking pin main body, which has a large diameter portion at one end, and a base of the medium diameter portion serves as a guide diameter for the shutter blade, and at least The crimping pin of the shutter blade for crimping has small diameter portions that are inclined sequentially at a distance corresponding to the plate thickness of the shutter blade, and further has a small diameter portion for crimping grooved meat at the tip thereof.

〔Example〕

Therefore, the details of the present invention will be explained below based on illustrated embodiments.

Figure 1 shows the caulking pin according to the present invention, that is, the second
The figure shows a staking pin for rotatably attaching the shutter blade 12 to the free end side of the arm 10 which is pivotally supported on the base, and this staking pin 1 is provided at one end. The shutter blade 1 is inserted between the flange portion 2, the large diameter portion 3 for pivotally supporting the arm 10, and the stepped portion 4 for receiving the shutter blade.
The base of the medium diameter part 9 has the same guide diameter as the shutter blade, and the plate thickness d of the shutter blade 12 extends from the base to the thickness d of the shutter blade 12. Up to a position a corresponding distance away, the diameter is gradually reduced to an inclined angle.

Therefore, the caulking pin 1 formed in this way is now inserted into the hole 11 of the arm 10 and the shutter blade 1.
When the small diameter portion 5 is inserted into the caulking hole 13 of No. 2 and the small diameter portion 5 is caulked using the chisel 8 having a conical tip (Fig. 1A), the thin small diameter portion 5 is formed in the thin portion. Due to the stress, the tip part expands outward from the part 6 corresponding to the plate thickness, and the edge of the hole 13 of the shutter blade 12 is firmly clamped and fixed from above and below between the step part 4 and the tip part 7. (Figure 5 B).

In this case, the base of the medium diameter portion 9 has the same diameter as the hole 13, but the portion 6 on the small diameter portion 5 side has a gap with the hole 13, so when the portion 7 is soaked, a slight bulge may occur. Since the shutter blades 12 do not exert any action in the direction of pushing and spreading the shutter blades 12, the shutter blades cannot be deformed.

FIG. 4 shows a second embodiment, in which the small diameter portion 5 is inclined compared to FIG.

Further, FIG. 5 shows a third embodiment, in which the first
This figure shows a case in which the pin 15 is caulked to a shutter blade 14 used as an aperture blade, for example, where the arm 10 is not attached as compared to the figure.

In the above-mentioned embodiment, the diameter is gradually reduced from the base to a point separated by a distance corresponding to the plate thickness d of the shutter blade 12. If the diameter is made smaller by sequentially inclining the shutter blades 12, the shutter blade 12 can be caulked with even more margin.

〔effect〕

As described above, according to the present invention, the medium diameter part is formed on the large diameter part through the stepped part, the base of the medium diameter part is used as the guide diameter of the shutter blade, and furthermore, at least the shutter blade is connected from this base. The guide diameter of this caulking pin is inserted into the hole of the shutter blade, and the small diameter part is caulked with a chisel to make the small diameter. The part can be expanded outward only at the tip of the part due to the stress generated in the thin part, and this can be done without adding any parts or having any adverse effect on the caulking hole part of the shutter blade. To easily and inexpensively constitute a shutter blade which has excellent durability and maintains the caulking position with high accuracy by firmly caulking the parts.

In other words, the stress due to caulking is greater and the deformation due to bulge is greater in the portion closer to the small diameter portion 5, so the diameter is reduced in proportion to this, ensuring a large fit clearance, and the base portion is Since it is thick, it maintains positional accuracy as a guide diameter, and buckling due to crimping is less likely to occur, so crimping can be performed more reliably.

[Brief explanation of drawings]

Figures 1A and 2B are cross-sectional views of the caulking pin according to the present invention shown before and after caulking, Figure 2 is a schematic diagram of a camera shutter made with the above caulking pin, and Figure 3 , B are sectional views of a conventional crimping pin shown before and after crimping, and FIGS. 4 and 5 are sectional views of second and third embodiments of the present invention, respectively. 1... Caulking pin, 3... Large diameter part, 4... Step part, 5... Small diameter part, 6... Groove, 10... Arm,
12...Shyatsuta feather.

Claims (1)

[Scope of utility model registration request] A medium diameter portion for supporting a shutter blade to be coupled is integrally formed in the caulking pin main body having a large diameter portion at one end, and the base of the medium diameter portion is the indoor diameter of the shutter blade, and at least A crimping pin for a shutter blade for a camera, characterized in that the small diameter is sequentially inclined at a distance corresponding to the plate thickness of the shutter blade, and a thin small diameter part for crimping is provided at the tip.