JPH0124707B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to fixing film cores that are applied to magazines of devices that use film or tape, such as cameras, videos, and tape recorders, and to winding devices for other strip-shaped materials. It is related to the device. In addition,
In this specification, a belt-like object in general is referred to as a film, and a member for winding the film is referred to as a film core.

(Prior art) Conventional film core fixing devices prevent the film core from twisting when the shaft rotates when the film core is attached to the shaft of the magazine (hereinafter simply referred to as the "shaft"). To this end, an engaging means, symbolized by a key and a keyway, is generally provided between the shaft center and the film core.

(Problems to be Solved by the Invention) However, this type of engagement has the disadvantage that it takes time to position the film core with respect to the axis. That is, in the case of the key and the keyway as described above, it is clear from our experience that matching between the key and the keyway cannot be obtained instantaneously. In order to solve this problem, there are models that have multiple keys and key grooves, but in any case, it is difficult to precisely match the engagement to the fixed position desired by the operator, and in this case, This causes problems such as abrasion caused by friction when the key and the keyway are engaged, and a certain degree of wobbling even when engaged. These drawbacks and inconveniences are not limited to the case of keys and keyways, but also the case of alternative engagement means, which have similar unresolved problems, and furthermore, the fixing position with respect to the film core and the shaft core is difficult to solve. There was a problem that the depth of engagement was limited and there was no degree of freedom in the combination of parts.

The present invention was made in view of the above circumstances, and
The purpose of this invention is to improve this type of film core fixing device and eliminate all of the above-mentioned drawbacks and inconveniences.

(Means for Solving the Problems) That is, in the present invention, a shaft core fitted with a ring-shaped elastic material is inserted into a cylindrical hole of a film core, and a compression means provided on the shaft core compresses the elastic material. A fixing device for a film core that bulges and deforms the outer peripheral part of the film core and fixes the film core to the axial center through the bulged part, wherein the elastic material is arranged in plural stages in the axial direction, and each elastic member It has a structure in which a metal ring is interposed between the materials.

(Example) The present invention will be described below based on preferred examples.

The film core fixing device according to the present invention includes fitting an elastic material 2 made of soft plastic, natural rubber, etc. to a film core mounting portion of a shaft core 1, and mounting a film core 3 at that location. It is equipped with a means for compressing the elastic material 2 in the axial direction, and the elastic material 2 is ring-shaped and arranged alternately with inelastic metal rings 4, 4. The reason why they are staggered in this manner is to ensure that the elastic material bulges out uniformly when the elastic material is compressed, which will be described later.

The means for compressing the elastic material 2 in the axial direction is provided in this example by a U-shaped stopper 5 rotatably mounted on the shaft core 1 . This stopper 5 rotates about a shaft 51 perpendicular to the axis 1, and due to this rotation, the shaft 51 and
The rings 4 are formed at different intervals from the topmost ring 4. That is, the third
As shown in the figure, the distance t between the shaft 51 and the lower end of the arcuate portion 52 in the state (1), in which the stopper 5 is upright, is greater than the axis in the state (2) when the stopper 5 is rotated. 51 and the terminal end 52a of the arcuate portion 52, the distance between the uppermost end ring 4 and the lower end disk 1a can be made wider or narrower. This compresses the material 2. In FIG. 3, the terminal end 52a of the arcuate portion 52 that contacts the uppermost ring 4 is located on the left side with respect to the axial direction m, that is, the virtual filament n connecting the shaft 51 and the terminal end 52a is located in the axial direction. Since the angle θ is provided in the clockwise direction with respect to m, the reaction force generated by compressing the elastic member 2 urges the stopper 5 to rotate in the clockwise direction (in the direction of the arrow in the figure). The rotational state of the stopper 5 shown in 2 will be maintained as it is. When the compression means is configured using such a stopper 5, as mentioned above, there is no need for a separate rotation maintaining means when rotating, and the rotation can be made in either the left or right direction with respect to the shaft 51. It is extremely convenient as it can be done even in Of course, the compression means is not limited to those described above, and any other known means may be used.

The elastic material 2 is provided so as to be expanded by compression in the axial direction. This can be done by leaving the outer portion of the elastic material open in the direction orthogonal to the compression direction without closing it, as in this example. Furthermore, as shown in FIGS. 4 and 5, the outer width of the elastic material 2 when not compressed is
H1 and the bulging outer width H2 of the elastic material 2 during compression,
and the inner diameter D of the film core 3,
Provided so that H1≦D<H2. That is, in FIG. 5, when 1 is not compressed, the film core 3 can be easily attached to and detached from the film core mounting portion of the shaft core 1 into which the elastic material 2 is fitted, specifically, into the cylindrical hole 3a. Further, when compressing the film core 2, the film core 3 is pressed against the bulging elastic member 2 at an arbitrarily set mounting position relative to the film core mounting portion, thereby fixing the film core 3 to the shaft core 1. . To remove the film core 3 from this state,
Rotate the stopper 5 so that it stands upright, and attach the elastic member 2 to the fifth
The uncompressed image shown in FIG. 1 may be used. Note that various shapes can be adopted as the shape of the metal ring 4 and the shape of the elastic material 2. For example, as shown in FIG. 6, the metal ring 4 may be formed into a tapered shape at the portion where it contacts the elastic material 2, and the tapered portion may cause the elastic material 2 to bulge outward during compression. good.

(Effects of the Invention) As described above, the present invention includes inserting a shaft core into which a ring-shaped elastic material is fitted into a cylindrical hole of a film core, and compressing the elastic material using compression means provided in the shaft core. A fixing device for a film core that bulges and deforms the outer peripheral part of the film core and fixes the film core to the axial center through the bulged part, wherein the elastic material is arranged in plural stages in the axial direction, and each elastic member Since a metal ring is interposed between the materials, the film core can be fixed to the shaft core at an arbitrarily set mounting position relative to the film core mounting portion of the shaft core, which is extremely convenient. Since fixation is achieved by pressure contact with the bulging elastic material, it is possible to avoid the phenomenon of rattling during engagement, which is the case with conventional products. The bulge is made uniform around all four circumferences, and since the elastic material is arranged differently from the non-elastic metal ring, the bulge of the elastic material is made even more uniform, resulting in a strong fixation. This eliminates the need for forming keys and keyways as in the past.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a film core fixing device according to the present invention, FIG. 2 is an external perspective view with the film core removed, FIG. 3 is a view showing a stopper used in the present invention, and FIG. 4 FIG. 5 is a longitudinal cross-sectional view of the present invention, and FIG. 6 is a view of another embodiment corresponding to FIG. 4. 1... Axial core, 2... Elastic material, 3... Film core, 3a... Cylindrical hole, 4... Metal ring.

Claims (1)

[Claims] 1. A shaft core fitted with a ring-shaped elastic material is inserted into a cylindrical hole of a film core, and a compression means provided on the shaft core is used to bulge and deform the elastic material to its outer circumference. A film core fixing device for fixing a film core to an axial center through a portion thereof, characterized in that a plurality of the elastic members are arranged in a plurality of stages in the axial direction, and a metal ring is interposed between each elastic member. Film core fixing device.