JPS62146193A - Method of screwing cap - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cap screwing method for automatically screwing and attaching a cap to a container opening.

(Prior art) In this type of conventional method, for example,
There is one disclosed in Publication No. 9. As shown in FIG. 8, the elastic ring body fitted to the inner circumferential side of the cap holding portion of the tightening head a is deformed under pressure, and the inner surface of the elastic ring body bulges out as a result of this. is held, and the tightening head a is rotated to screw the cap C onto the container opening.

(Problems to be Solved by the Invention) In the conventional method described above, rotation is applied to the cap by the frictional force between the elastic body and the cap, and the cap is screwed onto the mouth of the container. Therefore, it is easy to slip due to abrasion or deterioration of the elastic body or due to wetting of the cap surface. Therefore, the cap tends to be poorly screwed.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a method in which the cap is screwed onto the mouth of the container by rotating the cap, in which the uneven portion formed on the top surface of the cap has the following features: A feature (effect) characterized in that the cap is rotated by a tightening bed using a tightening rod having a cross-sectional shape that engages with the uneven portion in the rotational direction, and the cap is screwed on. The tightening rod descends and comes into contact with the top surface of the cap that is crowned on the mouth part, and by the rotationally driven tightening head, the tightening rod first rotates slowly and rotates in the direction of rotation to engage with the concave and convex portion of the cap. explore. During one rotation at maximum, the tightening rod engages with the uneven portion in the rotational direction. The clamping head then rotates the clamping rod so that the cap can be rotated and screwed onto the mouth of the container.

Incidentally, when the cap is screwed on, the speed of the screwing of the cap can be increased by rotating the tightening rod at high speed.

(Example) 1 to 3 show one embodiment of the present invention.

The cap 1 used in this example is as shown in FIG.
A recess 3a having a square cross section is formed on the top surface 2. On the other hand, the tightening rod 4a that engages with the recess 3a in the rotational direction has a square cross-sectional shape that is slightly smaller than the recess 3a. Therefore, as shown in FIG. 2, the recess 3a and the tightening rod 4a are fitted and engaged in the rotational direction. In addition, 9 indicates a screw, and 1o indicates a packing.

The cap screwing method of this embodiment will be explained with reference to FIG. The @ (container) 5 which has been capped with the cap 1 in the correct posture by a can and knob supply means (not shown) is placed on the tightening head 6.
(a). Next, the tightening head 6 descends and the tightening rod 4a comes into contact with the top surface 2 of the cap 1. The tightening rod 4a slowly rotates while in contact with the top surface 2, and searches for a direction of rotation that will fit into the recess 3a formed on the top surface 2 (1)). In this example, maximum 1
During the /4 rotation, the tightening rod 4a fits into the recess 3a,
A state of engagement in the rotational direction is reached (c). Then, the cap 1 is screwed onto the opening 7 of the bottle 5 by high-speed rotation of the tightening head 6, and the tightening head 6 rotates a predetermined number of times, so that the cap 1 is securely attached to the opening 7. Screw on (d). Thereafter, the tightening head 6 rises, and the bottle 5 with the cap 1 screwed thereon is sent +a to the next process, and the tightening head 6 screws on the next cap.

In this embodiment, the recess 3a formed on the top surface 2 of the cap 1 has a square cross-sectional shape, but as shown in FIG. may also be used.

FIG. 5 shows another embodiment of the invention. In this embodiment, a convex portion 3b having a square cross-sectional shape is formed on the top surface 2 of the cap 1. On the other hand, the axis of the tightening rod 4b has a square shape slightly larger than the convex portion 3b. The recess 8 has a cross-sectional shape of . The recess 8 and the projection 3b fit together in the state shown in FIG. 6 when the cap 1 is screwed on, and the inner surface of the recess 8 and the outer surface of the projection 3b engage with each other in the rotational direction.

FIG. 7 shows another embodiment of the invention. In this embodiment, the tightening rod 4c is formed in the shape of a pipe whose axis portion communicates vertically.

An air intake device (not shown) is connected to this tightening rod 4c, and the tightening rod 4c attracts the cap 1 by this air intake device. In this embodiment, the tightening head 6 has a cap reservoir (
(not shown), the cap 1 in the correct posture is attracted to the tip of the tightening rod 4c, and the cap 1 is transferred directly to the mouth 7 of the bottle 5 that is being conveyed without being covered with the cap, and is then tightened as it is. There is also the effect that it can be screwed together via the rod 4c.

In addition to the embodiments described above, the present invention can be configured in various ways. In the above embodiment, a cap with a shape in which the concavo-convex portion on the top surface of the cap and the tightening rod fit together is used, but if the cap can be engaged in the rotational direction, a cap with separate cross-sections is used. There is no problem in using .

(Effects of the Invention) The present invention has the above-mentioned configuration, and the rotational drive of the tightening device is performed through the tightening rod that engages with the uneven portion of the top surface of the cap in the rotational direction.
Since the information is reliably transmitted to the cap, it is possible to eliminate poor screwing of the cap due to slipping, etc., and to securely screw the cap onto the container opening.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a vertical sectional view thereof, Fig. 3 is a principle diagram showing the method step by step, and Fig. 4 is a cap used in this embodiment. Another example floor plan,
Fig. 5 is a perspective view of another embodiment of the present invention, Fig. 6 is a sectional view of a part thereof, Fig. 7 is a perspective view of another embodiment of the invention, and Fig. 8 is a schematic diagram showing a conventional example. i-1・−・−・・−・・−・・−−−−−−−m−−・−−
−−−・−Cap 2−−−−−−−−−−−−−−
−−−−−−−−−−−−−−Top surface 3−−−−−−−−
−−−−−−−−−−−−−−−−−−−−−−−−−
−One uneven part 4−・・−・−m−−−・−・・−・−・−
・〜・・・−・−・Tightening rod 5−−−−−−・−−−
−−−−1−−−・−・−・−・−・−・−Container 6−−
−−−−−−−−−・−・・−・−・・−・−・−・・
・・・−・・Tightening head 7−・−・・・・−−1−
−−・−１−−−−−・−−−−−−−・−−−１１−−Mouth Fig. 1 Fig. 7 Fig. 6 Fig. 5

Claims (1)

[Claims] (1) In the method of screwing the cap onto the mouth of the container by rotating the cap with a rotationally driven tightening head, the cap engages with the uneven portion formed on the top surface of the cap in the direction of rotation. A method for screwing on a cap, characterized in that the cap is rotated by a tightening head using a tightening rod having a cross-sectional shape, and the cap is screwed on.