JP3580866B2 - Cap mounting device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a cap mounting device suitably used for mounting a pre-screw cap such as a plastic cap on a plastic container.
[0002]
[Prior art]
BACKGROUND ART Conventionally, plastic containers made of a plastic material such as biaxially stretched polyethylene terephthalate resin have been widely adopted because they are durable and light. When mounting a pre-screw cap such as a plastic cap or the like with a pre-threaded screw on such a plastic container, the pre-screw cap is tightened with a predetermined tightening torque ( (A stopper torque).
[0003]
As a conventional example of such a cap mounting device, there is one described in Japanese Patent Publication No. 5-30712. 4A and 4B show a conventional cap mounting apparatus, in which FIG. 4A is a plan view, and FIG. The cap mounting device includes a suspension mechanism 5a that holds a plastic container 1 having a screw portion formed at a mouth portion and a flange portion 1a formed at a neck portion by supporting the flange portion 1a in a suspended state. A cap screwing mechanism (not shown) for screwing the pre-screw cap 4 into the mouth of the plastic container 1 held by the suspending mechanism 5a; and a flange 1a of the plastic container 1 provided on the suspending mechanism 5a. A rotation stopping blade portion 6 which is locked to the lower surface to prevent the plastic container 1 from rotating in the cap screwing direction.
[0004]
The suspension mechanism 5a is provided with a plurality of pockets 5b. The diameter of the pocket 5b is such that the neck of the plastic container 1 fits. Two pockets 6 are attached to each pocket 5b by set screws 6a. The detent blade 6 is provided with a locking blade 6c at a part of a peripheral edge of a disk-shaped main body 6b. FIG. 5 is an enlarged view of the locking blade 6c. The locking blade 6c is a blade having a wedge-shaped cross section. The locking blade 6c locks the lower surface of the flange portion 1a of the plastic container 1 accommodated in the pocket 5b to prevent the plastic container 1 from rotating.
[0005]
According to this cap mounting device, the lower surface of the flange portion 1a is supported by pushing the plastic container 1 into the pocket 5b of the suspension mechanism 5a, and the top of the container 1 is lifted by the cap screwing mechanism in a state where the bottom of the container 1 is floated. The pre-screw cap 4 attached to the mouth is rotated and screwed in the closing direction while applying a load. Then, the top load is applied by the cap screwing mechanism, so that the locking blade 6c is locked to the lower surface of the container flange portion 1a, and the cap is screwed in a state where the container 1 is fixed so as not to rotate. Has become.
[0006]
[Problems to be solved by the invention]
However, in the conventional cap mounting apparatus described above, the means for preventing the rotation of the plastic container 1 when the cap is screwed is the locking blade 6c biting into the lower surface of the flange portion 1a of the container 1, so the locking blade When the container 1 is rotated due to insufficient top load or abrasion of the cutting edge, the lower surface of the flange portion 1a is shaved and resin powder is removed. Sometimes occurred.
Further, when the container 1 is accommodated in the pocket 5b, there is a problem that the outer periphery of the flange portion 1a is damaged due to contact between the end surface or the lower surface of the flange portion 1a and the locking blade 6c, which is not preferable in use.
[0007]
The present invention has been made in view of the above circumstances, and is provided with a cap mounted so that the container can be prevented from idling at the time of cap screwing without causing damage to the outer periphery of the flange portion of the container or shaving the lower surface of the flange portion. It is intended to provide equipment.
[0008]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a cap mounting apparatus for suspending a plastic container having a screw portion formed at a mouth portion and a flange portion formed at a neck portion by supporting the flange portion. In a cap mounting device comprising a suspension mechanism for holding in a state, and a cap screwing mechanism for screwing a pre-screw cap to an opening of a plastic container held by the suspension mechanism, the suspension mechanism includes: It is characterized in that a needle head-shaped projection is provided which is engaged with the lower surface of the flange portion of the plastic container and prevents the plastic container from rotating in the cap screwing direction.
The shape of the projection may be conical or polygonal pyramidal.
According to a fourth aspect of the present invention, the projection is provided on the suspension mechanism so as to be freely retractable.
[0009]
[Action]
In the cap mounting device of the present invention, as a means for preventing rotation of the plastic container at the time of screwing the cap, a needle head-like projection is provided which is engaged with the lower surface of the flange portion of the plastic container. By the top load being applied, the projection bites into the flange portion of the container, and the rotation of the container when the cap is screwed can be reliably stopped.
Therefore, a sufficient container rotation preventing effect can be obtained without causing a cut in the flange portion or cutting the lower surface of the flange portion.
In addition, when the projection is provided so as to be freely retractable, it is possible to prevent the projection from protruding from the upper surface of the suspension mechanism when the container is taken in and out of the pocket. Can not be.
[0010]
【Example】
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIGS. 1 to 3 show an embodiment of a cap mounting apparatus according to the present invention. In these figures, reference numeral 11 denotes a plastic container (hereinafter referred to as a plastic bottle). The plastic bottle 11 is made of a synthetic resin such as biaxially stretched polyethylene terephthalate resin, and has a screw portion formed at the mouth thereof and a flange portion 11a formed at the neck portion thereof. The mouth and the neck are thicker than the trunk, and have sufficient rigidity.
[0011]
In the cap mounting apparatus, the plastic bottle 11 is first transferred to each pocket 15b of the suspension mechanism 15a after a synthetic resin pre-screw cap 14 is mounted on its mouth by a cap mounting mechanism (not shown). As the pre-screw cap 14, a pill fur proof cap made of a synthetic resin having a function of separating the pill fur proof ring portion provided at the lower portion of the cap main body tubular portion at the time of opening and clearly indicating the opening is used. You.
[0012]
The pocket 15b of the suspension mechanism 15a has a diameter such that the neck of the plastic bottle 11 fits therein. Further, as shown in FIG. 1A, three rotation stoppers 16 are detachably attached to the pocket 15b by set screws 16a. The rotation stopper 16 is provided with a conical protrusion 16c that protrudes upward at a peripheral edge of a disk-shaped main body 16b.
[0013]
2 and 3 are enlarged views of the projection 16c. FIG. 2 is a sectional view, and FIG. 3 is a perspective view. The projection 16c is engaged with the lower surface of the flange portion 11a of the plastic bottle 11 accommodated in each pocket 15b of the suspension mechanism 15a to prevent the plastic bottle 11 from rotating. The protrusion 16c is formed at a position slightly inward from the periphery of the main body 16b. The position where the projection 16C is formed can be appropriately set according to the shape of the flange portion 11a of the plastic bottle 11 and the like. If the apex angle of the projection 16c with respect to the bottom surface of the cone is too large, the effect of stopping the rotation of the plastic bottle 11 becomes insufficient. Preferably, the ratio of the diameter to the height (diameter: height) of the bottom surface of the cone is formed to be about 2: 1 to 1: 1. The size of the projection 16c can be appropriately changed depending on the size of the plastic bottle 11, the shape of the flange portion 11a, the shape of the projection 16c, and the like. For example, the height of the projection 16c projecting from the upper surface of the suspension mechanism 15a is reduced. It can be about 0.5 to 1 mm.
The projection 16c is formed using a super hard material. Further, the shape of the projection 16c is not limited to the conical shape as described above, and may be a needle head shape that is pin-pointed to the lower surface of the flange portion 11a. You can also.
In the example shown in FIG. 1, three anti-rotation portions 16 are attached to each pocket 15b, but the number of anti-rotation portions 16 is not limited to this, and may be two or four or more. . Further, the shape of the rotation preventing portion 16 is not limited to the shape shown in FIG. 1 and may be a polygon such as a square or a hexagon or a long plate.
[0014]
As shown in FIG. 1A, a guide 17 is provided outside the suspension mechanism 15a along the periphery of the suspension mechanism 15a. The guide 17 has an inner peripheral edge which is inserted into the pocket 15b of the suspension mechanism 15a and is fixed to another portion of the lower surface of the flange portion 11a of the plastic bottle 11 suspended by locking the lower surface of the flange portion 11a with the projection 16c. The plastic bottle 11 accommodated in the pocket 15b is prevented from coming out of the pocket 15b.
[0015]
Thus, the plastic bottle 11 is accommodated in each pocket 15b of the suspension mechanism 15a, the lower surface of the flange portion 11a is supported by a plurality of conical projections 16c, and the other portion of the lower surface of the flange portion 11a is placed on the inner peripheral edge of the guide 17. , With the bottom floating. Then, the pre-screw cap 14 attached to the mouth is rotated and screwed in the closing direction while applying top load by a cap screwing mechanism.
[0016]
In this cap mounting device, since the projection 16c is provided so as to be engaged with the lower surface of the flange portion 11a of the plastic bottle 11, the top load applied when mounting the pre-screw cap 14 causes the lower surface of the flange portion 11a to be mounted. The projection 16c having a conical shape is deeply digged. Thereby, when the pre-screw cap 14 is rotated and screwed in the closing direction, the plastic bottle 11 can be fixed so as not to rotate. When the top load is released after the screwing, the engagement of the projection 16c with the flange portion 11a is weakened, and the plastic bottle 11 can be easily taken out from the suspension mechanism 15a.
[0017]
When the projection 16c is detachably fixed to the main body 16b, it can be easily replaced when the projection 16c is worn. For example, in the present embodiment, as shown in FIG. 2, the rotation preventing portion 16 includes a projection member 20 having a projection 16c formed on the head and a step 16d projecting outward on the bottom, and the step 16 The main body 16b includes a lower member 21 having a concave portion into which the main body 16b is detachably inserted, and an upper member 22 having a through hole smaller than the opening of the concave portion. And a set screw 16a that is removably fixed to the suspension mechanism 15a in a state where they are overlapped. Then, the step 16 d of the projection member 20 is detachably fitted into the recess of the lower member 21, and the projection member 20 is inserted through the through hole of the upper member 22, so that the lower member 21 and the upper member 22 are set with screws. By fixing at 16a, the protruding member 20 is detachably fixed. When the projection 16c is worn, the projection member 20 can be easily replaced with a new one.
[0018]
In the cap mounting device of the present invention, a telescopic mechanism such as a hydraulic cylinder or an electromagnetic drive mechanism (not shown) is attached to the conical projection 16c so that the projection 16c can be freely protruded and retracted from the upper surface of the main body 16b. Can also be configured. Thus, when the plastic bottle 11 is inserted into the pocket 15b and when the plastic bottle 11 is taken out from the pocket 15b, the projection 16c is lowered to be buried so that no apex comes out from the upper surface of the main body 16b. Can be raised so that the projection projects from the upper surface of the main body 16b. In this manner, the plastic bottle 11 can be smoothly inserted into and removed from the pocket 15b while avoiding contact between the flange portion 11a and the projection 16c.
[0019]
【The invention's effect】
As described above, according to the cap mounting apparatus of the present invention, since the needle-head-shaped projection is provided on the lower surface of the flange portion of the plastic container, the top load is applied by the cap screwing mechanism, so that the projection is provided. Can bite into the container flange, and the rotation of the container when the cap is screwed can be reliably stopped. Therefore, it is possible to prevent poor capping such as poor cap winding and oblique capping of the cap. Then, a sufficient container rotation preventing effect can be obtained without causing a cut in the flange portion or cutting the lower surface of the flange portion.
In addition, when the protrusion is provided so as to be freely retractable, it is possible to prevent the protrusion from coming into contact with the flange when the plastic container is put in and out of the pocket of the suspension mechanism. Therefore, the plastic container can be smoothly taken in and out, and at the same time, it is possible to prevent the end surface or the lower surface of the flange portion of the plastic container from being damaged.
[Brief description of the drawings]
1A and 1B show an embodiment of a cap mounting apparatus of the present invention, wherein FIG. 1A is a plan view and FIG.
FIG. 2 is a sectional view of a protrusion in the device shown in FIG.
FIG. 3 is a perspective view of a protrusion in the device shown in FIG.
4A and 4B show examples of a conventional cap mounting apparatus, in which FIG. 4A is a plan view, and FIG.
5 is a perspective view of a locking blade in the device shown in FIG.
[Explanation of symbols]
11 plastic bottle (plastic container), 11a flange part
14: Pre-screw cap, 15a: Suspension mechanism, 16c: Protrusion.

Claims (4)

A plastic container having a screw portion formed at the mouth and a flange portion formed at the neck portion, a suspension mechanism for holding the plastic container in a suspended state by supporting the flange portion, and a plastic container held by the suspension mechanism. In a cap mounting device having a cap screwing mechanism for screwing a pre-screw cap to the mouth,
A cap mounting device, wherein the suspension mechanism is provided with a needle head-shaped projection that is locked to the lower surface of the flange portion of the plastic container and prevents rotation of the plastic container in the cap screwing direction. The cap mounting device according to claim 1, wherein the projection has a conical shape. 2. The cap mounting device according to claim 1, wherein the protrusion has a polygonal pyramid shape. The cap mounting device according to any one of claims 1 to 3, wherein the projection is provided on the suspension mechanism so as to be freely retractable.

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