JPH1129191A - Method for clamping lid body with open-proof mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To clamp a lid body under a condition where a definite number of contrarotation-proof nails are always climbed over and are hooked by a method wherein the lid body is rotated to measure the torque and when the contrarotation-proof nail collides with the first nail and climbs over it to detect decrease in the torque, a specified amt. of rotation is performed to finish clamping. SOLUTION: When a lid body 1 is clamped, after a bottle body 6 on which the lid body 1 is placed is placed on a base by elevating an elevating mechanism of a clamping device, a helical flight 2 of the lid body 1 is hooked with a helical flight 4 of the bottle body 6 to screw the lid body 1. When the screwing advances, the contrarotation-proof nail 3 of the lid body 1 is lowered and collides with the contrarotation-proof nail 5a and when the lid body 1 is rotated furthermore, the tip nail 3a of the contrarotation-proof nail 3 of the lid body 1 climbs over the contrarotation-proof nail 5a of the bottle body 6. As a point where rotational torque is decreased when the first contrarotation-proof nail 3a of the lid body 1 climbs over the contrarotation-proof nail 5a of the bottle body 6 is detected to make it as an end point, it is possible to control accurately the number of climbing of the nail and to mechanize clamping of the lid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of tightly controlling a cover with an opening prevention mechanism, which controls the amount of tightening accurately and always performs a constant tightening.

[0002]

2. Description of the Related Art Conventionally, in order to prevent the bottle from being opened,
A screw cap provided with an inversion prevention claw is used. For example, as shown in FIGS. 2 and 3, a lid 1 is provided with a screw 2 for fastening protruding from the inner wall surface and formed with anti-reverse claws 3 a, 3 b, 3 c. FIG.
The screw 4 and the cover 1 which engage with the screw 2 of the cover 1 as shown in FIG.
, Which engage with the inversion prevention claws 3a, 3b,.
The bottle body 6 provided with 5b... On the outer periphery of the opening is used.

When the bottle 6 is sealed with the lid 1, when the lid 1 is rotated with the lid 1 and the bottle 6 together, the screw 2
And 4 are engaged and the screwing proceeds, and when approaching the end point, the inversion prevention claw 3a of the lid 1 collides with the inversion prevention claw 5a of the bottle body 6 to increase the rotational torque. The second inversion prevention claw 3a climbs over the inversion prevention claw 5a of the bottle body 6 and the torque is reduced. When the rotation further proceeds, the second overturn prevention claw 5b is next passed over, and two each of the overturn prevention claw of the lid 1 and the bottle body 6 are engaged with each other. Will be engaged. In this manner, when a predetermined number of the reverse prevention claws are engaged, the fastening end point is determined.

The tightened lid 1 is engaged with reversing prevention claws 3 and 5 formed of serrated projections, and is configured not to be able to rotate in the opening direction. The opening is taken out by cutting the sealing portion 8 of the contents taking-out port 7 or the like, and the contents are taken out. In this case, the end of the fastening of the lid 1
The following method was used. That is, when the inversion prevention claw gets over, the rotational torque of the lid increases, and after the inversion prevention claw gets over, the torque decreases. Further, when the inversion prevention claw subsequently gets over, the number of the inversion prevention claw that gets over increases, so that the torque at the time of getting over gradually increases.

Conventionally, the rotational torque is measured, and when the torque reaches a predetermined torque, the fastening end point is determined. But,
It is difficult to maintain the dimensional accuracy of plastic molded articles at a high level, and changes in materials, molding conditions, cooling rates, etc.
The amount of shrinkage during molding changes, and the dimensional accuracy changes. For this reason, the value of the torque when the inversion prevention claw gets over changes.
Even when a predetermined torque value is indicated, there may be a case where the number of overhanging pawls of the inversion preventing pawls is insufficient. For example, the rotation torque value when the second overturn prevention number is exceeded may become larger than the rotation torque at the time of overcoming the third inversion prevention claw due to the variation. If the torque is set so as to stop the rotation of the lid 1 after the claw has been overcome, a case may occur in which the lid 1 stops at the second position. For this reason, conventionally, an operation of confirming with human eyes was required.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and the present invention has been designed to always go over a certain number of reversing prevention claws and automatically tighten when a certain number of reversing prevention claws are engaged. An object of the present invention is to provide a method of fastening a lid with an opening prevention mechanism that can be performed.

[0007]

SUMMARY OF THE INVENTION In the present invention, in tightening a lid having a tightening screw and an inversion prevention claw, the lid is rotated and its torque is measured. A method of tightening the lid with an opening prevention mechanism, which detects the position where the torque is reduced by hitting the first claw by hitting the reverse prevention claw and rotating the position by a predetermined amount from the position, to terminate the tightening. To provide.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2 and FIG. 3, a bottle and a lid to be tightened by the method of the present invention are provided with a conventional screwing thread 2 on an inner wall surface. A bottle body 6 having a lid 1 with an opening prevention mechanism on which a reversal prevention claw 3 is protruded, a fastening screw 4 engaged with the lid 1 and a reversal prevention claw 5 is used. The inversion prevention claw 3 of the lid 1 makes the front slope when rotating in the direction of tightening the lid 1 a gentle slope,
It is formed by protruding a required number of serrated protrusions having the other surface being steep. Similarly, the inversion prevention claw 5 of the bottle body 6 has a gentle inclination on the side where the inversion prevention claw 3 of the lid 1 approaches, and a steep inclination on the opposite side.

The molding material of the lid 1 and the bottle 6 is not particularly limited, but is preferably made of plastic, and is preferably made of polypropylene, polyethylene, polyester, polycarbonate,
Polyamide or the like is used. As a device for automatically tightening the lid 1 with the reversing prevention mechanism, an automatic tightening device 10 having the configuration shown in FIG. 1 can be used. The automatic fastening device 10 of FIG. 1 has a base 11 on which the bottle body 6 is placed.
1 is a bottle body 6 that holds the bottle body 6 and tightens the lid body 1.
And a container holding mechanism 12 for preventing rotation of the container. A support 13 is erected on the base 11, and a support 1 for mounting a rotation mechanism is provided on an upper end of the support 13 via an elevating mechanism 14.
5 are connected in series.

The support 15 has a motor 16 for rotating the lid 1, and is provided with a rotating shaft 17 connected to a rotating shaft of the motor 16. The rotating shaft 17 is provided with the lid 1. A torque meter 18 for measuring a rotational torque at the time of tightening, and an encoder 19 for controlling a rotation angle of the lid 1 are mounted. The body holder 20 is provided continuously. The lid holder 20 engages with a vertical protrusion of the lid 1 and does not idle in the direction of rotation, but has a structure in which the lid 1 can be easily taken in and out in the vertical direction.

When the cover 1 with the opening prevention mechanism is tightened by using the apparatus shown in FIG.
To raise the motor 16, the rotating shaft 17, and the lid holder 18. Next, after the bottle body 6 on which the lid 1 is placed is placed on the base 11, the lid holder 20 and the like are lowered by the elevating mechanism 14 and rotated by the motor 16. The screw 2 of the lid 1 and the screw 4 of the bottle 6 are engaged by the lowering and rotation of the lid holder 20, and the lid 1 is screwed. As the screwing proceeds, the inversion prevention claw 3 of the lid 1 descends and hits the inversion prevention claw 5 a of the bottle body 6. When the lid 1 is further rotated, the claw at the tip of the inversion prevention claw 3 of the lid 1 is rotated. 3a gets over the inversion prevention claw 5a of the bottle body 6.

At this time, the rotational torque increases from the point a to the point b in FIG. 4, and after the reversal prevention claw 3a gets over, the rotational torque rapidly decreases to point c. A point d at which the rotational torque shows a rate of decrease equal to or more than a predetermined amount is set as a tightening reference point, and an angle over a predetermined number of inversion prevention claws is rotated from the position of the reference point, and the required angle is rotated. At the end of the tightening. Means for rotating the lid by a predetermined angle from the reference point d can be performed by an encoder or a servomotor. Alternatively, the operation may be performed by a stepping motor.

The setting of two rotational torque values for determining the reference point is performed in consideration of the variation in rotational torque change.
Is less than or equal to three times the standard deviation σ _b of the variation when the first reversing prevention claw 3a of the first vehicle climbs over the inversion prevention claw 5a of the bottle body 1. Is preferably set to a value that is at least three times higher than the standard deviation σ _c of the variation from the point c at which the temperature decreases. In the present invention, the inversion prevention claw 3a of the lid 1 is
a is detected as a reference point, and the point is used as a reference point, and is rotated by a predetermined angle from the reference point as an end point. Therefore, even if the dimensional accuracy of the lid 1 or the bottle 6 is low, the point can be accurately determined. The position can be detected, and the fastening end point can be accurately controlled.

[0014]

【Example】

(Confirmation Experiment) The lid and the bottle shown in FIGS. 2 and 3 were molded, and the rotational torque when the vehicle passed over the inversion prevention claw was measured. The results are as shown in Table 1, and it was confirmed that the rotational torque at the time of overcoming is likely to be larger than the rotational torque at the time of the next overcoming considering the variation.

[0015]

[Table 1]

(Example 1) A bottle having a lid mounting portion having a diameter of 70 mm and a shape shown in FIG. 3 was formed using high-density polyethylene. Further, a fastening test was performed by molding a lid having the shape shown in FIG. 2 using high-density polyethylene. The pitch between the claws is 5 mm, and the rotational torque reduction rate when the lid anti-reversal claw first passes over the bottle anti-reversal claw is 30 mm.
% Is defined as a reference point, and a point rotated 28 degrees (corresponding to the number of over-claw riding 4) from the reference point is defined as a fastening end point. Table 2 shows the results of 30 tests.

[0017]

[Table 2]

[0018]

According to the present invention, it is possible to accurately control the number of overhangs by a detector, a measuring instrument, or the like, and to mechanize the lid tightening, thereby eliminating the need for manual work. I can do it.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of an apparatus for carrying out the present invention.

2A and 2B are diagrams showing a lid used in the present invention, wherein FIG. 2A is a longitudinal sectional view and FIG. 2B is a transverse sectional view.

3A and 3B are views showing a bottle body used in the present invention, wherein FIG. 3A is a partial longitudinal sectional view, and FIG.

FIG. 4 is a graph showing a change in rotational torque when the lid is tightened.

[Description of Signs] 1 Lid 2, Screws 3, 3 a, 3 b, 3 c Inversion prevention claw 4 Screws 5, 5 a, 5 b, 5 c Inversion prevention claw 6 Bottle body 11 Base 14 Lifting mechanism 16 Motor 17 Rotation axis 18 Torque meter 19 Encoder 20 Lid holder

Claims (2)

[Claims] In the fastening of a lid having a fastening thread and a reversing prevention claw, the lid is rotated and its torque is measured, and the reversing prevention claw collides with the reversing prevention claw of the bottle body. 1
Detects the position where the torque has decreased by overcoming the second claw,
A method of tightening a lid with an opening prevention mechanism that completes tightening by rotating a predetermined amount from that position. 2. The lid and the bottle are made of synthetic resin.
A method for tightening a lid with an opening prevention mechanism as described in the above.