Spool

Abstract

A spool includes a tube for winding a material. The outer surface of the tube is provided with a step portion along the axial direction thereof. The step portion is as high as the thickness of the material. A cutting groove is provided on a side, close to the axial centre of the tube, of the step portion. A resilient clip for clamping the material is fixed in the cutting groove, the upper end of the resilient clip is connected to a notch on one side of the cutting groove, and the lower end thereof is inclined towards the other side of the cutting groove. The spool positions a cutter by means of the cutting groove, and the resilient clip clamps the cut material in the cutting groove.

Claims

1. A spool, comprising a tube (1) used to wind a material (4), wherein a step portion (2) is disposed on an outer surface of the tube (1) along an axial direction and the height of the step portion (2) is equal to a thickness of a single layer of the material (4), wherein a cutting groove (3) is disposed at one side of the step portion (2) close to an axis of the tube (1); wherein an resilient clip (5) used to clamp the material (4) is fixed into the cutting groove (3); an upper end of the resilient clip (5) is connected with a notch at one side of the cutting groove (3); and a lower end of the resilient clip (5) is inclined towards the other side of the cutting groove (3); wherein an upper end of the resilient clip (5) is fixed to one side of the cutting groove (3) away from the step portion (2); an extension (6) is disposed on the upper end of the resilient clip (5) towards the tube (1); and the extension (6) is embedded on the tube (1) so that an outer surface of the extension (6) is in smooth transition with the outer surface of the tube (1).

2. The spool according to claim 1, wherein the extension (6) and the resilient clip (5) are connected through a sharp angle.

3. The spool according to claim 2, wherein a tenon (7) is disposed at one surface of the extension (6) towards the tube (1); a mortise (8) matched with the tenon (7) is formed in the surface of the tube (1); and the tenon (7) is closely matched with the mortise (8).

4. The spool according to claim 3, wherein skid-proof stripes (9) are disposed at an outer side of the resilient clip (5).

5. The spool according to claim 4, wherein the skid-proof stripes (9) are also disposed on the step portion (2).

6. The spool according to claim 5, wherein the cutting groove (3) has a width of 1-1.5 mm and a depth of 2 mm.

7. The spool according to claim 6, wherein the resilient clip (5) has a thickness of 0.3-0.6 mm.

8. The spool according to claim 7, wherein the extension (6) has a thickness of 0.8-1.2 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic structure of a spool in embodiment 1;

(2) FIG. 2 is a schematic operation of a prior spool;

(3) FIG. 3 shows schematically shows an operation of a spool of embodiment 1;

(4) FIG. 4 is a schematic structure of a spool in embodiment 2;

(5) FIG. 5 is a schematically exploded view of a spool of embodiment 2; and

(6) FIG. 6 schematically shows an operation of a spool of embodiment 2.

(7) In the figures: 1. tube; 2. step portion; 3. cutting groove; 4. roll material; 5. resilient clip; 6. extension; 7. tenon; 8. mortise; and 9. Skid-proof stripe.

DETAILED DESCRIPTION OF THE INVENTION

(8) The utility model will be further described below in detail with reference to the drawings.

(9) Embodiment 1: a spool is shown in FIG. 2, wherein the spool has a cylindrically continuous surface, when a material 4 such as a film is wound thereon, the terminal of the material 4 will dent some subsequent rolls of material 4 terminal.

(10) With reference to FIG. 3 of the description, a step portion 2 is disposed on the surface of the spool so that the diameter of the upper side of the step portion 2 is larger than the diameter of the lower side of the step portion 2. The height of the step portion 2 is set to the thickness of a film of the wound material 4. Thus, when the material 4 is paved on the lower side of the step portion 2, the outer surface of the material 4 is flush with the upper side of the step portion 2, so as to effectively eliminate such a conventional defect of dents and wrinkles.

(11) With reference to FIG. 1 of the description, the step portion 2 is disposed on the surface of the spool along the axial direction of the spool. The lower side of the step portion 2 comes downwards to form a cutting groove 3, and the width of the cutting groove 3 is enough for the cutter to pass through. Once the material 4 is wound, the terminal of the material 4 is covered on the step portion 2 and is then cut through the matching of the cutter and the cutting groove 3, so as to ensure that the terminal of the material 4 is smoothly spliced with the step portion 2 after the terminal is cut, avoiding a gap between the terminal and the step portion 2.

(12) Embodiment 2: a spool is shown in FIG. 4 and FIG. 5 of the description, the spool includes a tube 1, a step portion 2 and a cutting groove 3. The cutting groove 3 has a width of 1-1.5 mm and a depth of 2 mm. A resilient clip 5 is disposed in the cutting groove 3. An extension 6 is integrally with and above the resilient clip 5. The resilient clip 5 has a thickness of 0.3-0.6 mm. The extension has a thickness of 0.8-1.2 mm. The thickness of the resilient clip 5 is less than the thickness of the extension 6. The strength of the extension 6 is larger than that of the resilient clip 5. The extension 6 is stably fixed to the tube 1 while the resilient clip 5 can be deformed. The resilient clip 5 and the extension 6 are generally formed into the shape of the figure 7. The extension 6 is attached to the surface of the tube 1. The extension 6 has a tenon 7 inserted into a mortise 8 formed in the tube 1. The tenon 7 and the mortise 8 are engaged tightly. The extension 6 is fixed to the surface of the tube 1 by means of a static frictional force. The resilient clip 5 and the extension 6 are connected through a sharp corner so that the sharp corner can match the cutter, so that the material can be cut easily.

(13) The resilient clip 5 is arranged in the cutting groove 3. The lower end of the resilient clip 5 is inclined to the step portion 2. With reference to FIG. 6 of the description, after the material 4 is cut by the cutter and brought into the cutting groove 3, a buckle is formed by the resilient clip 5 and the step portion 2 to clamp the terminal of the material 4 tightly. Meanwhile, by means of the wedging of the resilient clip 5, the resilient clip 5 effectively grips the material 4, thereby preventing the material 4 from coming out of the cutting groove 3. Skid-proof stripes 9 are disposed at opposite sides of the resilient clip 5 and the step portion 2 to enhance the clamping the material 4 between the resilient clip 5 and the step portion 2.

(14) The specific embodiments are only used to illustrate but not to limit the utility model. Modifications without inventive contribution can be made as required to the embodiments by those skilled in the art after reading the description, and shall be protected by the patent law as long as within the scope of claims of the utility model.