JP2003261101A - Container heat seal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structurally simple yet sturdy long lasting container heat seal device. <P>SOLUTION: This container heat seal device is provided with a pressure body 13 which moves up and down with a downward pressing face 35 and with an oscillating seal head 14 having an upward pressure receiving face 63 able to get into contact with the face 35 and move away therefrom and having a downward seal face 75 at its bottom end. The face 35 and the face 63 are formed able to be swingable at a point O on the axis line L as the center where the seal head 14 orthogonally crosses the seal face 75 to the body 13 in a condition that the face 63 touches the face 35. In order to make the face 63 into contact with the face 35, and to keep the face 75 in a horizontal posture in this condition, the head 14 and the body 13 are energized by a spring 74. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container heat-sealing device used for heat-sealing a lid member to the rim of a cup-shaped container for filling dessert or the like.

[0002]

2. Description of the Related Art As a container heat-sealing device of this type, as disclosed in, for example, Japanese Patent Application Laid-Open No. 1-279004, a swinging seal head can be swung by a ball joint on a lifting / lowering pressing body. The seal head has a downward sealing surface at the lower end, and the ball joint has a ball positioned on an axis orthogonal to the sealing surface, and is provided integrally with the ball and screwed into the pressing body. It is known that the pressing body and the seal head are biased by elastic means so as to hold the sealing surface in a horizontal posture.

[0003]

Sealing pressure is repeatedly applied to the ball joint. Therefore, the connecting portion of the ball joint to the pressing body and the seal head is easily damaged. In particular, damage was concentrated on the screw member of the ball joint and its peripheral portion. When the breakage occurs, the seal head may fall off the pressing body.

An object of the present invention is to provide a container heat-sealing device having a simple structure, yet having sufficient structural strength and having a long life.

[0005]

A container heat-sealing device according to the present invention comprises an elevating and lowering pressing body having a downward pressing surface,
A swinging seal head having an upward pressure receiving surface capable of contacting and separating from the pressing surface and having a downward sealing surface at the lower end is provided, and the pressing body is contacted with the pressure receiving surface in contact with the pressing body. The pressing surface and the pressure receiving surface are formed so that the seal head can swing about a point on the axis orthogonal to the sealing surface, and the pressure receiving surface is brought into contact with the pressing surface.
In this state, the pressing body and the seal head are biased by the elastic means so as to keep the sealing surface in a horizontal posture.

The container heat seal device according to the present invention is
The pressure receiving surface is brought into contact with the pressing surface by the elastic means, and the sealing pressure is transmitted from the pressing surface to the pressure receiving surface in this state. Therefore, as the connecting structure for the pressing body and the seal head, there is no need for a ball joint like the conventional art. Therefore, it is possible to provide a container heat-sealing device having a simple structure, yet having sufficient structural strength and having a long life.

Further, when at least one of the pressing surface and the pressure receiving surface is formed in a shape including a spherical surface centered on the swing center point of the seal head, the swing operation of the seal head can be performed smoothly. it can.

If the pressing surface is hemispherical and the pressure receiving surface is tapered, the contact resistance between the pressing surface and the pressure receiving surface can be reduced.

Further, a suspension rod is provided upright on the seal head, and a through hole is formed in the pressing body so that the suspension rod loosely fits and projects upward, and the suspension rod has an upward projecting end portion. If the spring retainer is provided and the elastic body is a compression coil spring fitted on the suspension rod and interposed between the seal head and the spring retainer, the elastic force can be applied to the compression body and the seal head with a simple structure. Can be applied to.

If the number of the compression coil springs is three or more and the plurality of compression coil springs are located at equal intervals on the circumference around the axis of the seal head, the pressing body is pressed. Also, the elastic force acting on the seal head can be dispersed uniformly.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a sealing station on the way of the container transportation path. The cup-shaped container C is carried into the sealing station while being received by the holder plate H. The mouth of the container C is covered with a band-shaped lid member F.

The sealing device comprises a horizontal support plate 11 straddling the container transport path, a vertically downward fluid pressure cylinder 12 mounted on the support plate 11, a pressing body 13 which is moved up and down by the fluid pressure cylinder 12, and a pressing member. A seal head (14) suspended from the body (13) is swingable.

On the lower surface of the support plate 11, a rotation stopping rod 15 is provided in a hanging shape. The fluid pressure cylinder 12 has a piston rod 16 penetrating the support plate 11 and extending in parallel with the detent rod 15.

The pressing body 13 includes a vertical upper cylinder 21 fixedly fitted on a piston rod 16 and a piston rod 16.
Vertical bar-shaped pressing member connected to the lower end of 16 in a straight line
It consists of 22 and.

An upper flange 23 is provided at the lower end of the outer surface of the upper cylinder 21. The upper flange 23 has three first rod holes 31 and one second rod hole 32. As shown in FIG. 2, the three first rod holes 31 are located at equal intervals on the circumference centered on the axis of the upper tubular body 21. Second
The rod hole 32 is located in the middle of two adjacent first rod holes 31 on the same circumference. First and second
Lubrication bushes 33 and 34 are fitted in the rod holes 31 and 32, respectively. The rotation stopping rod 15 is slidably inserted into the second rod hole 32 via a lubricating bush 34.

The lower end of the pressing member 22 has a downward hemispherical pressing surface.
35 are formed.

The seal head 14 includes a lower cylindrical body 41 surrounding the pressing member 22, a head main body 42 fixedly fitted on the lower cylindrical body 41 and having a heater (not shown) incorporated therein, and a head. A seal ring 43 attached to the lower surface of the main body 42 by a bolt is provided.

A lower flange 44 is provided on the upper end of the outer surface of the lower cylindrical body 41. The lower flange 44 has three third rod holes 53 and one fourth rod hole 54. The three third rod holes 53 are concentric with the three first rod holes 31, and the fourth rod hole 54 is concentric with the second rod hole 32. A lubricating bush 55 is fitted in the fourth rod hole 54. The rotation stopping rod 15 is passed through the fourth rod hole 54, but a lower gap C1 is formed between the both.

A closing wall 61 is provided at the lower end of the lower tubular body 41. A pressure receiving member 62 is placed on the upper surface of the closing wall 61. An upwardly tapered pressure receiving surface 63 is formed on the upper surface of the pressure receiving member 62.

A lid member retainer 64 is attached to the lower surface of the closing wall 61 with screws.

Three suspension rods 71 are provided on the upper surface of the head body 42.
Are provided upright so as to pass through the first and third rod holes 31 and 53, respectively. A vertical cylindrical spacer 72 is interposed between the lower surface of the lower flange 44 and the upper surface of the head main body 42 so as to surround the suspension rod 71. An upper gap C2 is created between each suspension rod 71 and the first rod hole 31.

A spring retainer 73 is provided on the upper end of the suspension rod 71. A compression coil spring 74 fitted to the suspension rod 71 is interposed between the upper flange 23 and the spring retainer 73.

A seal surface 75 is formed on the lower surface of the seal ring 43.

The pressing surface 35 and the pressure receiving surface 63 are shown in detail in FIG. The pressing surface 35 has a center O and a curvature R of a hemisphere formed by the pressing surface 35. In other words, the taper formed by the pressure receiving surface 63 is also a conical surface. The pressing surface 35 and the pressure receiving surface 63 are in line contact with each other.

As shown in FIG. 1, when the seal head 14 is located at the upper limit, the seal surface 75 is horizontal,
The axis L of the seal head 14 orthogonal to this is vertical.

If the thickness of the rim of the container C and the thickness of the lid material F are not uniform during the sealing, the sealing surface 75 follows this and the axis L of the sealing head 14 is inclined with respect to the vertical line. In this case, some of the springs 74 will be compressed and the rest of the springs 74 will be expanded, causing the seal head 14 to swing about point O. After sealing
The seal head 14 is returned to its original posture.

FIG. 4 shows a modification of the pressing surface 35 and the pressure receiving surface 63. In this case, the pressing surface 35 is formed as a convex hemispherical surface like the pressing surface 35 shown in FIG. 3, but the pressure receiving surface 63 is formed on the concave hemispherical surface that is brought into surface contact with this.

Referring to FIG. 5 showing a further modification,
The pressure receiving surface 63 is formed in a concave hemispherical surface as in FIG. On the other hand, the central portion of the pressing surface 35 is formed into a smooth plane P, and the peripheral portion thereof is rounded with a small radius r. Similar to the case shown in FIG. 3, the pressing surface 35 and the pressure receiving surface 63 have a line contact relationship.

In the above example, the pressing surface 35 is convex and the pressure receiving surface 63 is concave, but the pressing surface 35 is concave and the pressure receiving surface 63 is convex so as to reverse the irregularities. May be done with.

[0031]

According to the present invention, there is provided a container heat-sealing device having a simple structure, sufficient structural strength, and a long life.

[Brief description of drawings]

FIG. 1 is a vertical longitudinal sectional view of a sealing device according to the present invention.

2 is a horizontal cross-sectional view taken along line II-II of FIG.

3 is a partially enlarged sectional view of FIG.

FIG. 4 is a cross-sectional view corresponding to FIG. 3 showing a modified example.

FIG. 5 is a cross-sectional view corresponding to FIG. 3 showing another modification.

[Explanation of symbols]

13 Pressing body 14 seal head 35 Pressing surface 63 Pressure receiving surface 74 spring 75 Sealing surface

Continued front page    (72) Inventor Michio Ueda             No. 10 Nishinokawa, Taro Yasu, Taro Kitajima-cho, Itano-gun, Tokushima Prefecture             Ground 1 Shikoku Kakoki Co., Ltd. F-term (reference) 3E049 AA05 AB03 DB02                 3E094 AA06 CA03 CA06 CA16 CA17                       DA02 FA04 HA12

Claims (5)

[Claims] 1. A lifting / lowering pressing body having a downward pressing surface, and a swinging seal head having an upward pressure receiving surface capable of coming into contact with and separating from the pressing surface and having a downward sealing surface at a lower end thereof. The pressure surface and the pressure receiving surface are formed so that the seal head can swing about a point on the axis orthogonal to the seal surface with respect to the pressure body with the pressure receiving surface in contact with the pressure surface. A container heat seal device in which a pressure body and a seal head are urged by elastic means so that the pressure receiving surface is brought into contact with the pressure receiving surface and the sealing surface is held in a horizontal posture in this state. 2. The container heat-sealing device according to claim 1, wherein at least one of the pressing surface and the pressure-receiving surface is formed in a shape including a spherical surface centered on a swing head swing center point. 3. The container heat-sealing device according to claim 2, wherein the pressing surface is hemispherical and the pressure receiving surface is tapered. 4. A suspension head is provided with a suspension rod in an upright state, and a pressing body is provided with a through hole in which the suspension rod is loosely fitted and which is projected upward, and an upward projecting end portion of the suspension rod is formed. The container heat seal according to any one of claims 1 to 3, wherein a spring retainer is provided, and the elastic body is a compression coil spring that is fitted to a suspension rod and interposed between the seal head and the spring retainer. apparatus. 5. The number of compression coil springs is a plurality of three or more, and the plurality of compression coil springs are arranged at equal intervals on a circumference around the axis of the seal head.
The container heat-sealing device according to.