JPS6136527Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cylinder for winding up metal foil such as aluminum foil, copper foil, stainless thin plate, rolled thin steel plate, etc.

In the metal foil winding cylinder described above, a large compressive stress is applied as it is wound, and as it is used, the longitudinal middle part tends to become smaller in diameter and deform into a drum shape. The change in the compressive stress increases significantly in the vicinity of the ends of the rolled metal foil in the width direction. Trouble was becoming more likely to occur. This problem is particularly likely to occur when the metal foil is heat treated in a rolled state.

The present invention aims to make it easier to avoid the above-mentioned troubles by simple modification.

Next, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, the outer peripheral surface of the cylinder 1 is made up of a peripheral surface portion 2a parallel to the axis and two inclined peripheral surface portions 2b, 2b whose diameter becomes smaller as the end a of the cylinder 1 approaches. ,
The cylindrical body 1 has a curved surface whose diameter becomes larger toward the center in the axial direction.
An annular groove 3 in the circumferential direction of the cylinder is formed at a position slightly displaced toward the cylinder end a from a position corresponding to the widthwise end of the rolled-up metal foil 4. , a cylindrical body for winding up metal foil such as a stainless steel plate or a rolled thin steel plate.

In other words, even if the cylindrical body is deformed due to compressive stress applied as the metal foil 4 is wound up, the outer circumferential surface originally forms the curved shape as shown in FIG. 2 in the deformed state. This ensures that the peripheral surface is parallel or nearly parallel to the cylindrical axis in the range of winding the metal foil, and the stress near the end of the rolled metal foil 4 is reduced by the notch effect of the annular groove 3 at the disposed portion. The deformation of the metal foil is concentrated in the area corresponding to the edge of the metal foil in order to suppress deformation.

The outer circumferential surface can be formed into a curved surface by forming a series of curved surfaces as shown in FIG. 3, or by combining a circumferential surface portion 2a parallel to the axis and a curved surface portion 2c as shown in FIG. may be configured.

Reference numeral 5 in FIG. 4 denotes four notches into which chucks for rotationally supporting the cylinder 1 are removably fitted, and four notches are provided at each end a of the cylinder in the axial direction.

As explained in the above embodiments, the feature of the technical means taken by the present invention is that the outer circumferential surface of the cylindrical body is
In the axial direction of the cylinder, the central part has a curved surface with a larger diameter, and a pair of annular shapes are formed on the inner circumferential surface of the cylinder along the circumferential direction of the cylinder, with an interval slightly larger than the width of the wound metal foil. Located at the point where the groove was formed,
You can obtain the following effects.

In other words, compared to, for example, a bobbin for winding fibers, an extremely large compressive stress is applied to the cylinder for winding metal foil, so even if the cylinder cannot avoid being deformed into a drum shape, In the design, the outer circumferential surface of the cylinder is curved in advance with a larger diameter toward the center, so that in the deformed state, the circumferential surface of the cylinder in the area where the metal foil is wound can be parallel or almost parallel to the axis of the cylinder, and the product We were able to suppress the deterioration in quality. Moreover, due to the structure of the annular groove provided in addition to the above structure,
By reducing the strength of the cylindrical part near the widthwise end position of the rolled metal foil and concentrating compressive stress on that part to make it easier to deform, the circumferential surface of the cylindrical body in the area where the metal foil is wound can be made flatter. For example, by using a cylindrical body that is wider than the rolled metal foil, it is easy to flatten the rolled and unrolled parts of the metal foil.
While avoiding deformation due to direct contact between the edge of the metal foil and other objects as much as possible, for example, the end of the cylindrical body may be The metal foil edges could be prevented from warping due to smooth deformation, ensuring product quality.

[Brief explanation of the drawing]

The drawings show an embodiment of the metal foil winding cylinder according to the present invention, in which FIG. 1 is a partially cutaway front view, FIG. 2 is a partially cutaway front view in the rolled state, and FIGS. 3 and 4. FIG. 2 is a partially cutaway front view showing another example of the shape of the outer circumferential surface. 1... Cylindrical body, 3... Annular groove, 4... Metal foil.

Claims (1)

[Scope of utility model registration request] The outer circumferential surface of the cylinder body is formed into a curved surface with a larger diameter toward the center in the direction of the axis of the cylinder body, and the inner peripheral surface of the cylinder body 1 is provided with a gap slightly larger than the width dimension of the rolled-up metal foil 4. A cylindrical body for winding up metal foil, characterized in that a pair of annular grooves 3, 3 are formed along the circumferential direction of the cylindrical body.