JP3763373B2 - Cap holding part of capping headset - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cap holding part of a headset provided in a capping machine that attaches a pre-screw cap to a container mouth.
[0002]
[Prior art]
Conventionally, as this kind of cap holding part, what was described in Japanese Utility Model Laid-Open No. 2-52793 is known. FIG. 5 shows a cap holding portion described in the publication, and this cap holding portion 1 has a round tip at a peripheral wall portion 3 surrounding a hollow portion 2 into which the cap is fitted, for example, like a metal ball. A plurality of formed pressing members 4 are provided so as to be able to advance and retreat in the inner and outer directions of the peripheral wall portion 3 and a part of the tip thereof protrudes into the hollow portion 2. The urging member 5 is urged inward. An engagement surface 6 is formed on the inner wall surface of the peripheral wall portion 3. The engagement surface 6 is formed of vertical unevenness along a knurl formed on the outer peripheral surface of the cap.
As a cap to be attached to the container mouth using the cap holding part 1, a pre-screw cap made of synthetic resin, that is, a screw part that is screwed onto the inner wall of the cylinder part and a male screw formed on the outer surface of the container mouth part. A non-slip knar having a plurality of grooves formed in the outer surface of the cylinder portion and extending in the vertical direction is used.
When the cap is inserted into the hollow portion 2, the conventional cap holding portion 1 is fitted with a knurl on the outer peripheral surface of the cap, thereby preventing rotational movement in the circumferential direction of the cap. Further, the pressing member 4 provided so as to be able to advance and retract in the inner and outer directions of the peripheral wall portion 3 and a part of the tip of the peripheral wall portion 3 protrudes into the hollow portion 2 presses the outer periphery of the cylindrical portion of the cap. It is designed to hold the cap inserted in the.
[0003]
[Problems to be solved by the invention]
However, since the conventional cap holder 1 uses a metal ball as the pressing member 4, after the cap is held by the cap holder 1, the ball rotates to weaken the cap holding force, and before capping or capping. Immediately after, there was a problem that the cap dropped. If the cap falls before capping, a cap-free product with no cap at the container mouth portion is produced, and if the cap falls immediately after capping, the cap is obliquely covered.
[0004]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cap holding portion that can prevent the occurrence of capping failure due to the fall of the cap.
[0005]
[Means for Solving the Problems]
In the invention according to claim 1 of the present invention, in the cap holding part of the headset provided in the capping machine for attaching the pre-screw cap to the container mouth part, the outer surface of the peripheral wall part surrounding the hollow part into which the cap is fitted is provided. A groove is provided along the circumferential direction, and a through portion reaching the hollow portion is formed in at least one portion of the groove, and a ring-shaped coil spring is fitted into the groove, and the outside of the coil spring A cap holding portion of a capping headset, wherein a ring-shaped rubber ring is fitted to the penetrating portion, and a ball is disposed in the penetrating portion between the coil spring and the rubber ring.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an embodiment of a cap holding portion of a capping headset according to the present invention. The cap holding portion 10 has a cylindrical shape and is synthesized from the lower side of the hollow portion 11. A resin pre-screw cap (hereinafter referred to as a cap) can be inserted and held. The cap holding part 10 is made of metal.
[0007]
The cap holding part 10 is provided with grooves 13 along the circumferential direction on the outer surface of the peripheral wall part 12 surrounding the hollow part 11 into which the cap is fitted, and reaches the hollow part 11 at least at three locations of the groove 13. A through-hole 14 is formed, and a ring-shaped coil spring 15 is fitted into the groove 13, and a ring-shaped rubber ring 16 is fitted outside the coil spring 15. A metal ball 17 is disposed between the coil spring 15 and the rubber ring 16.
Further, an engagement surface 18 is formed on the inner wall surface of the peripheral wall portion 12. The engagement surface 18 is formed of vertical irregularities along a knurl formed on the outer peripheral surface of the cap.
[0008]
The coil spring 15 is usually a metal coil spring, but a coil spring made of synthetic resin such as nylon or urethane can also be used. This coil spring 15 is in contact with the outer peripheral surface of the cap inserted into the hollow portion 11 of the cap holding part 10 and is inserted by inserting the coil wire into a knurled groove on the outer peripheral surface of the cap while the coil is spread. The cap is prevented from rotating in the circumferential direction, and a tightening force is applied to the cap to prevent the cap from falling off the hollow portion 11.
[0009]
The metal ball 17 may be inserted into the penetrating portion 14 between the coil spring 15 and the rubber ring 16 so that a part of the coil spring 15 can be pressed radially inward, and its size is not limited. . In place of the metal material, ceramic balls, hard high-strength plastic, or the like may be used. The metal ball 17 provided in the through portion 14 is urged radially inward by a rubber ring 16 on the outer side thereof.
[0010]
The rubber ring 16 is made of natural rubber or synthetic rubber in the same manner as the rubber ring used in the conventional cap holder 1 shown in FIG. The rubber ring 16 presses the coil spring 15 at the position of the penetrating portion 14 inward in the radial direction via a metal ball 17.
[0011]
FIG. 3 illustrates a headset to which the cap holder 10 is attached. The headset 20 includes a spindle shaft 21, a head body 22 attached to the tip of the spindle 20 via a spring 24, a winding portion 23 attached to the head body 22 via a bearing 25, And a permanent magnet 26 disposed opposite to the winding portion 23. The cap holding part 10 is attached to the tip of the winding part 23.
[0012]
The headset 20 to which the cap holding unit 10 is attached is installed in an appropriate capping machine such as a rotary capping machine, and the spindle shaft rotates according to the movement of the capping machine and performs a certain vertical movement. Then, the cap is held at a predetermined position, and then the held cap A is screwed into the mouth of the container B as shown in FIG.
As this cap A, a pre-screw cap made of synthetic resin, that is, a screw portion that is screwed into a male screw formed on the outer surface of the container mouth portion is formed on the inner wall of the tube portion, and a large number of portions extending in the vertical direction to the outer surface of the tube portion A non-slip knurl having a groove is formed.
Further, as the container B, as shown in FIG. 4, a synthetic resin container having a flange formed at the neck or a glass bottle is used.
[0013]
In the cap holding portion 10, the cylindrical portion of the cap A is fitted into the hollow portion 11 in the holding state of the cap A. The knurl on the outer periphery of the cap A is fitted into an engagement surface 18 in which a number of vertical grooves formed on the inner wall surface of the peripheral wall portion 12 are formed along the circumferential direction.
Further, at the three through portions 14, the coil spring 15 is pushed out radially inward by the elastic force of the rubber ring 16 through the metal ball 17, and the portion abuts on the outer peripheral surface of the cap A, and the coil The coil wire is inserted into the knurled groove on the outer peripheral surface of the cap while being spread, thereby preventing rotation of the inserted cap in the circumferential direction and applying a clamping force to the cap, Prevent cap from falling off.
[0014]
The cap holding part 10 is provided with a groove 13 along the circumferential direction on the outer surface of the peripheral wall part 12 surrounding the hollow part 11 into which the cap A is fitted, and a through part 14 reaching the hollow part 11 is provided in the groove 13. A ring-shaped coil spring 15 is fitted into the groove 13, and a ring-shaped rubber ring 16 is fitted to the outside of the coil spring 15, and the coil spring 15 and the rubber ring are inserted into the through portion 14. When the cap A is inserted into the hollow portion, the coil wire of the spring 15 is inserted into the knurled groove on the outer peripheral surface of the cap. In addition to preventing the inserted cap from rotating in the circumferential direction, the cap A can be tightened to prevent the cap from falling off the hollow portion 11. It is possible to prevent the occurrence of fog-free cap products and diagonal cap by the cap falling off at the time of grayed.
[0015]
【Example】
The cap holding part shown in FIGS. 1 and 2 was produced. This cap holding part has a maximum outer diameter of 47.2 mm, an inner diameter of 28.13 to 30.72 mm, a vertical length of 38 mm, a vertical length of the engaging surface 18 of 15.5 mm, a depth of the groove 13 of 5.7 mm, and a penetrating part. 14 (three places) dimensions 9.3 mm (width) x 3.6 mm (height), metal ball 17 diameter 3/16 inch, nitrile rubber ring 16 outer diameter 42.7 mm, rubber ring inner diameter 35 The outer diameter of the coil spring 15 is 41.8 mm and the inner diameter of the coil spring is 35.4 mm.
A coil spring was fitted into the groove of the cap holding part, then a metal ball was put into the penetrating part, and a rubber ring was fitted to the outside thereof to form a cap holding part. Further, this cap holding part was attached to a headset of an Alcoa capping machine.
As the cap, a polypropylene pre-screw cap having a diameter of 28 mm and an outer diameter of 29.9 mm at the upper part of the cylindrical portion was used. Caps and PET bottles are continuously supplied to the capping machine, and caps are continuously screwed into about 200,000 bottles. It was. As a result, there were no caps and slanted caps, and the incidence of defective cap attachments was 0%.
On the other hand, as a result of capping using the conventional cap holding part shown in FIG. 5 for comparison, two uncapped products and five obliquely covered products were generated out of 200,000.
[0016]
【The invention's effect】
As described above, in the cap holding portion of the present invention, a groove is provided along the circumferential direction on the outer surface of the peripheral wall portion surrounding the hollow portion into which the cap is fitted, and a through portion reaching the hollow portion is formed in the groove. A ring-shaped coil spring is fitted in the groove, a ring-shaped rubber ring is fitted on the outside of the coil spring, and the through-hole is positioned between the coil spring and the rubber ring. When the cap is inserted into the hollow portion, the coil wire of the spring is inserted into the knurled groove on the outer peripheral surface of the cap, thereby rotating the inserted cap in the circumferential direction. In addition to preventing the cap from falling out of the hollow portion by applying a tightening force to the cap, the cap-free product or cap slant due to cap removal during capping The occurrence of fogging can be prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a cap holding portion of the present invention.
FIG. 2 is a longitudinal sectional view of the same cap holding part.
FIG. 3 is a cross-sectional view showing a headset equipped with a cap holding portion of the present invention.
FIG. 4 is a front view showing a cap holding state of the same headset.
FIG. 5 is a partial cross-sectional front view illustrating a conventional cap holding portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Cap holding part, 11 ... Hollow part, 12 ... Circumferential wall part, 13 ... Groove, 14 ... Penetration part, 15 ... Coil spring, 16 ... Rubber ring, 17 ... Metal ball, A ... ... Cap (pre-screw cap made of synthetic resin)

Claims (1)

In the cap holding part of the headset provided in the capping machine that attaches the pre-screw cap to the container mouth,
A groove is provided along the circumferential direction on the outer surface of the peripheral wall portion surrounding the hollow portion into which the cap is fitted, and a through portion reaching the hollow portion is formed in at least one portion of the groove,
A ring-shaped coil spring is fitted into the groove, and a ring-shaped rubber ring is fitted to the outside of the coil spring, and the groove is positioned between the coil spring and the rubber ring. Cap holding part of capping headset, characterized by arranging balls.

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