JPH0872984A - Capping device - Google Patents

Abstract

PURPOSE: To prevent a container from rotating on capping and eliminate inconveniences like screw-fitting defects of caps. CONSTITUTION: In this capping device, a cap 4 is fitted with a screw while the flange 1b of a container 1 is hung by a suspension mechanism and a preventive part 20 against rotation, made of a rubber or a flexible plastic, is provided to get in contact with a part of the body of the plastic container 1 held by the suspension mechanism. And a guide body 19 preventing the plastic container from slipping out of a pocket, is provided at the periphery of a starwheel 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap mounting device suitable for mounting a pre-screw cap such as a plastic cap on a plastic container.

[0002]

2. Description of the Related Art Conventionally, a plastic container made of a plastic material such as biaxially stretched polyethylene terephthalate resin has been widely adopted because of its durability and lightness. When installing a pre-screw cap such as a plastic cap with pre-threaded parts on such a plastic container, add a top load and use the headset of the capping machine to tighten the pre-screw cap to the specified tightening torque ( Tighten so that the capping torque can be obtained.

FIG. 6 shows a cap mounting device described in Japanese Patent Publication No. 5-30712 as an example of a conventional cap mounting device. This cap mounting device
A suspension mechanism 5a for holding the plastic container 1 having a screw portion formed at the mouth portion and a flange portion 1b formed at the neck portion in a suspended state by supporting the flange portion 1b, and the suspension mechanism 5a. The cap screwing mechanism 8 for screwing the pre-screw cap 4 into the mouth of the plastic container 1 and the suspension mechanism 5a are provided, and are locked to the lower surface of the flange portion 1b of the plastic container 1 to secure the plastic container 1. A rotation stop blade portion (hereinafter, referred to as a locking claw 6) that prevents rotation in the cap screwing direction is provided.

According to this cap mounting device,
The plastic container 1 is supported by the suspension mechanism 5a on the lower surface of the flange portion 1b, and the cap screwing mechanism 8 is added to the bottom portion while the bottom portion is floating, and the pre-screw cap 4 attached to the mouth is rotated in the closing direction. It is designed to be screwed on.

[0005]

However, in the conventional cap mounting device described above, the means for preventing the rotation of the plastic container 1 when the cap is screwed is locked to the lower surface of the flange portion 1b of the container 1. Since only the claws 6 are used, the anti-rotation effect cannot be said to be sufficient, and the container 1 may rotate, or the lower surface of the flange portion 1b may be scraped by the locking claws 6. That is, since the container is stopped from rotation only by the locking claw 6, it is necessary to strongly engage the locking claw 6 with the lower surface of the container flange portion 1b in order to reliably prevent the container 1 from rotating. It is necessary to make the cutting edge of the locking claw 6 sharp, and make the top load of the cap screwing mechanism 8 stronger than an appropriate value (about 10 kg) and push the cap strongly to hold the container of the locking claw 6. It is necessary to strengthen the biting into the lower surface of the flange portion 1b.
If the locking claw 6 is new and the cutting edge is sharp, the biting into the lower surface of the container flange portion 1b is strong, but if the cutting edge wears, the biting becomes weak and the lower surface of the flange portion 1b is scraped off to generate resin powder. become. Further, when the blade edge is worn, the effect of locking the lower surface of the flange portion 1b is weakened, and the container 1 idles during capping.
Further, by strengthening the top load of the cap screwing mechanism 8, the screw 1a of the container 1 and the screw of the cap 4 come into strong contact with each other, capping does not go smoothly, and a capping defect phenomenon such as oblique cap fogging occurs.

The present invention has been made in view of the above circumstances, and it is possible to prevent the idling of the container when the cap is screwed, and to reduce the addition to the locking claws to extend the service life of the locking claws. The purpose is to provide a cap mounting device.

[0007]

SUMMARY OF THE INVENTION In the cap mounting apparatus of the present invention, a plastic container having a screw portion formed at the mouth and a flange portion formed at the neck is housed in a plurality of pockets provided at the periphery of the plastic container. A rotary transporting means provided with a star wheel for rotating and transporting the container, and a suspension mechanism for supporting the flange portion of the plastic container accommodated in the pocket of the rotary transporting means and holding it in a suspended state,
A cap screwing mechanism for screwing a pre-screw cap to the mouth of the plastic container held by this suspension mechanism,
A cap mounting device provided in the suspension mechanism, comprising a locking claw for locking the lower surface of the flange portion of the plastic container to prevent the plastic container from rotating in the cap screwing direction. An anti-rotation part made of rubber or soft resin is provided so as to come into contact with a part of the body part of the plastic container held by, and a guide for preventing the plastic container from coming out of the pocket around the star wheel. It is characterized by having a body. The guide body may support the other portion of the flange portion of the plastic container held by the suspension mechanism. It is preferable that the rotation preventing portion has a concave curved surface along a part of the outer circumference of the body portion of the plastic container held by the suspension mechanism.

In another aspect of the present invention, an anti-rotation belt made of rubber or soft resin is provided so as to come into contact with a part of the body of the plastic container held by the suspension mechanism, and the star wheel is A guide body is provided around the periphery to prevent the plastic container from slipping out of the pocket.

[0009]

The cap mounting device of the present invention is so arranged as to come into contact with a part of the body of the plastic container held by the suspension mechanism.
A rotation prevention part made of rubber or soft resin is provided, and a guide body for preventing the plastic container from coming out of the pocket is provided around the star wheel, and both the locking claw and the rotation prevention part are provided. Since the rotation of the container can be prevented, the effect of preventing the rotation of the container is enhanced. Further, even if capping is performed with the top load of the cap screwing mechanism set to an appropriate value, a sufficient container rotation preventing effect can be obtained, so that the cap can be screwed smoothly. Furthermore, even if capping is performed with the top load of the cap screwing mechanism set to an appropriate value, a sufficient container rotation prevention effect can be obtained, so the load applied to the blade edge of the locking claw is reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. 1 to 4 show a first embodiment of a cap mounting device of the present invention, in which reference numeral 1 is a plastic container (hereinafter referred to as a plastic bottle). The plastic bottle 1 is made of a synthetic resin such as biaxially stretched polyethylene terephthalate resin, and has a screw portion 1 at its mouth.
a is formed, and a flange-shaped flange portion 1b is formed on the neck portion. The mouth portion and the neck portion are thicker than the body portion, and have sufficient rigidity.

This plastic bottle 1 is sequentially fed to an intake star of a capping machine by a conveying means such as a screw conveyor (not shown), and a synthetic resin pre-screw cap 4 is attached to the mouth of the plastic bottle 1 and then the intake is taken. It is transferred from each pocket of the star to each pocket 12 of the center star 11. As this pre-screw cap, a pill fur proof cap made of synthetic resin or the like having a function of clearly showing opening when the pill fur proof ring portion provided at the lower portion of the cap main body cylinder portion is disconnected when the cap is opened is used. .

As shown in FIG. 1, the center star 11 includes a rotating support column 13, a turntable 14 attached to the support column 13, and an upper star wheel fixed above the turntable 14 of the support column 13. 15
And a lower star wheel 16. The upper star wheel 15 and the lower star wheel 16 are fixed via a support member 18 fixed to the support column 13.

Each pocket 12 of the upper star wheel 15
As shown in FIG. 2, the two locking claws 17 are provided with a set screw 17
It is detachably attached by c. FIG. 3 (a)
(C) shows the locking claw 17, and the locking claw 1
In a part of the peripheral edge of the disk-shaped main body portion 7, a blade 17a having a center protruding upward and extending along the radial direction of the main body portion is formed. Further, reference numeral 17b is a hole for inserting the set screw 17c. The locking claw 17 is used for the upper star wheel 15.
The blade 17a is engaged with the lower surface of the flange portion 1b of the plastic bottle 1 in which the respective pockets 12 are accommodated to prevent the plastic bottle 1 from rotating. In addition, in the example shown in FIG. 2, two locking claws 17 are attached to each pocket 12, but the number of the locking claws 17 is not limited to this, and may be three or four or more. good. Further, the shape of the locking claw 17 is not limited to that shown in FIGS. 3A to 3C, and may be a polygonal shape such as a quadrangle or a hexagon, a long plate shape, an oval shape, or the like.

Outside the upper star wheel 15, FIG.
Further, as shown in FIG. 2, a guide 19 is provided along the peripheral edge of the upper star wheel 15. The guide 19 is inserted into the pocket 12 of the upper star wheel 15, and the inner peripheral edge of the lower surface of the flange portion 1b of the plastic bottle 1 suspended by locking the lower surface of the flange portion 1b with the locking claws 17. Abut on other parts, pocket 12
The plastic bottle 1 housed in is prevented from coming out.

Each pocket 12 of the lower star wheel 16
As shown in FIGS. 1 and 4, a rotation preventing portion 20 formed of rubber or soft resin is attached to the b so as to contact the body portion of the plastic bottle 1 accommodated in the pocket 12b. The rotation preventing portion 20 is in the form of a thick plate having a concave curved surface 20a that can be brought into close contact with a part of the outer periphery of the body portion of the plastic bottle 1, and the concave curved surface 20a of the plastic bottle 1 housed in the pocket 12b. The pocket 12b is attached so as to project inward from the peripheral edge of the pocket 12b so as to come into contact with the body.

In the cap mounting device described above, the plastic container 1 is housed in each pocket 12 of the upper star wheel 15 which is a suspension mechanism, and the lower surface of the flange portion 1b is supported by a plurality of locking claws 17 and the guide 19 is provided. The other part of the lower surface of the flange portion 1b is placed on the inner peripheral edge of the container, and the pre-screw cap 4 attached to the mouth portion is closed while the top portion is added by the cap screwing mechanism 8 while rotating and conveying the bottom portion 1c in a floating state. It is designed to rotate and screw in the direction.

In this cap mounting device, the pocket 12b of the lower star wheel 16 is made of rubber or soft resin so as to come into contact with a part of the body of the plastic bottle 1 held in a suspended state in the pocket 12 of the upper star wheel 15. Is provided with a rotation preventing portion 20, and a guide 19 for preventing the plastic bottle 1 from coming out of the pocket 12 is provided around the upper star wheel 15, and both the locking claw 17 and the rotation preventing portion 20 are provided. Since the rotation of the plastic bottle 1 can be prevented, the effect of preventing rotation of the plastic bottle 1 is enhanced, and the occurrence of defective cap winding can be prevented. Further, even if capping is performed with the top load of the cap screwing mechanism 8 set to an appropriate value (about 10 kg), a sufficient container rotation preventing effect can be obtained, so that the cap 4 can be screwed smoothly, and the cap 4 can be worn diagonally. It is possible to prevent capping defects such as. Furthermore, even if capping is performed with the top load of the cap screwing mechanism 8 set to an appropriate value, a sufficient container rotation preventing effect can be obtained.
The load applied to the cutting edge of the locking claw 17 is reduced, and the locking claw 17
It is possible to extend the life of the.

FIG. 5 is a diagram showing a second embodiment of the present invention. The cap attaching device of this embodiment has substantially the same components as those of the previous embodiment, and in this embodiment,
The lower star wheel 16 is used instead of the rotation prevention unit 20.
A rotation prevention belt 21 is provided in each pocket 12b. The rotation preventing belt 21 is made of rubber or a soft synthetic resin, preferably a rubber belt, and is wound around a plurality of belt stoppers 22 provided on the peripheral portion of the lower star wheel 12b, and the plastic bottle 1 is placed in the pocket 12b. When the container is accommodated, the rotation preventing belt 21 comes into contact with the body of the plastic bottle 1 and comes into close contact with the outer periphery of the body. Also, on the outside of the lower star wheel 16,
A guide 23 is provided and contacts the outside of the plastic bottle 1 housed in the pocket 12b to prevent the plastic bottle 1b housed in the pocket 12b from coming out. In this embodiment, it is possible to obtain substantially the same operational effects as the previous embodiment.

[0019]

As described above, the rotation preventing portion made of rubber or soft resin is provided so as to come into contact with a part of the body portion of the plastic container held by the suspension mechanism, and around the star wheel, Since the configuration is provided with a guide body for preventing the plastic container from coming out of the pocket, and the rotation of the container can be prevented by both the locking claw and the rotation preventing portion, the rotation preventing effect of the container is enhanced,
It is possible to prevent the occurrence of defective cap winding. Further, even if capping is performed with the top load of the cap screwing mechanism set to an appropriate value, a sufficient container rotation preventing effect can be obtained, so that the cap can be screwed smoothly, and capping defects such as diagonal covering of the cap can be prevented. .
Furthermore, even if capping is performed with the top load of the cap screwing mechanism set to an appropriate value, a sufficient container rotation prevention effect can be obtained, so the load applied to the blade edge of the locking claw is reduced and the service life of the locking claw is extended. be able to.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a first embodiment of a cap mounting device of the present invention.

FIG. 2 is a plan view of an upper star wheel in the device shown in FIG.

3A and 3B show locking claws in the device shown in FIG. 1, where FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a side view.

FIG. 4 is a plan view of a lower star wheel of the same cap attachment device.

FIG. 5 is a plan view of a lower star wheel showing a second embodiment of the cap attaching device of the present invention.

FIG. 6 is a front view showing a conventional cap mounting device.

[Explanation of symbols]

1 ... Plastic bottle (plastic container), 4 ... Pre-screw cap, 8 ... Headset (cap screwing mechanism), 11 ... Center star, 12 ... Pocket (suspension mechanism), 13 ... Strut, 14 ...... Turntable, 15 …… Upper star wheel, 16 …… Lower star wheel, 17 …… Locking claw, 17 a …… Blade, 19, 23
...... Guide, 20 …… Rotation prevention part, 20a …… Concave curved surface,
21 …… Anti-rotation belt.

Claims (4)

[Claims] 1. A rotary transport equipped with a star wheel for storing and transporting a plastic container having a screw part formed at a mouth part and a flange part formed at a neck part in a plurality of pockets provided at a peripheral edge of the plastic container. Means, a suspension mechanism for supporting the flange portion of the plastic container accommodated in the pocket of the rotary conveying means, and holding the suspension portion in a suspended state, and a prestressing mechanism at the mouth of the plastic container held by the suspension mechanism. A cap screwing mechanism for screwing a screw cap, and a locking claw provided on the suspension mechanism for locking the plastic container on the lower surface of the flange portion to prevent rotation of the plastic container in the cap screwing direction. In a cap mounting device equipped with, a rubber or soft resin is formed so as to come into contact with a part of the body of the plastic container held by the suspension mechanism. Rolling prevention portion is provided, and the periphery of the star wheel, a cap mounting apparatus characterized by guide member to prevent slipping out plastic containers from the pockets is provided. 2. The cap mounting device according to claim 1, wherein the guide body supports the other portion of the flange portion of the plastic container held by the suspension mechanism. 3. The cap mounting device according to claim 1, wherein the rotation preventing portion has a concave curved surface along a part of an outer periphery of a body portion of the plastic container held by the suspension mechanism. . 4. A rotary transport equipped with a star wheel for storing and transporting a plastic container having a screw part formed at a mouth part and a flange part formed at a neck part in a plurality of pockets provided at a peripheral edge of the plastic container. Means, a suspension mechanism for supporting the flange portion of the plastic container accommodated in the pocket of the rotary conveying means, and holding the suspension portion in a suspended state, and a prestressing mechanism at the mouth of the plastic container held by the suspension mechanism. A cap screwing mechanism for screwing a screw cap, and a locking claw provided on the suspension mechanism for locking the plastic container on the lower surface of the flange portion to prevent rotation of the plastic container in the cap screwing direction. In a cap mounting device equipped with, a rubber or soft resin is formed so as to come into contact with a part of the body of the plastic container held by the suspension mechanism. Rolling prevention belt is provided, and the periphery of the star wheel, a cap mounting apparatus characterized by guide member to prevent slipping out plastic containers from the pockets is provided.