JPH04367425A - Cap sealing device - Google Patents

Abstract

PURPOSE:To prevent the generation of wrinkles or positional slip from happening, and feed a blank accurately and assuredly by a method wherein a slip preventive belt which press-carries both ends of a blank while being confronted with a carrying conveyor at the lowermost end position of a suction head on the outer peripheral surface of a rotary wheel, is provided. CONSTITUTION:A rotary wheel 4, which intermittently rotates in the carrying direction in the vertical plane above a carrying connveyor 7, is provided, and suction heads 3 which are radially and evenly arranged, are provided on the outer peripheral surface of the rotary wheel 4. A slip preventive belt 6 to press- carry both ends of a blank 2 which is placed on the mouth part of a container is provided in such a manner that the slip preventive belt 6 is confronted with the carrying conveyor 7 at the lowermost end position of the suction head 3, and at the same time, a first heat shrinkage unit 9, a rectangular reversing unit 10 and a second heat-shrinkage unit 11 are provided. By this method, when a blank is fed to the mouth part of a container, the blank can be fed accurately and assuredly without generating wrinkles or positional slip.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for sealing the mouth of a container with a heat-shrinkable film in the form of a cap.

0002

2. Description of the Related Art Conventionally, methods for supplying a blank formed from a heat-shrinkable film to the mouth of a container in a cap sealing device include a method in which a blank made from a heat-shrinkable film is fed by being held between conveyor belts;
There are systems in which the material is adsorbed onto an endless belt and conveyed and supplied, but all of these methods have drawbacks such as wrinkles, misalignment, and other troubles.

[0003] Also, as a method for heat shrinking, there is a method in which a blank is placed on a container and is conveyed by a conveyor while pressing the top surface of the mouth part of the container with an endless belt, and hot air is injected from both sides of the blank to cause heat shrinkage. There are some that are passed through a heat shrink tunnel in that state to be heat-shrinked. However, in the former method, since the top of the blank is pressed by a belt, the container cannot be rotated, so both sides of the container may shrink well, causing insufficient shrinkage on the front and rear surfaces.
In the latter method, the thermal efficiency of the heat-shrinking part was poor, and there was a risk that the contents of the container would be adversely affected.

0004

Problem to be Solved by the Invention The present invention provides a device for cap-sealing a container mouth with a heat-shrinkable film, which eliminates the occurrence of wrinkles and avoids misalignment when supplying blanks cut into single sheets to the container mouth. It is an object of the present invention to provide a cap seal device having a blank supply system that can supply blanks accurately and reliably without any blanks, thereby making it possible to produce cap seals with a good finish and excellent aesthetic appearance.

Another object of the present invention is to provide a cap sealing device that not only improves thermal efficiency in a heat-shrinking method but also heat-shrinks necessary parts continuously and evenly in a short period of time, thereby achieving a good finished aesthetic appearance. The purpose is to enable excellent cap sealing.

[0006]

[Means for Solving the Problems] A first means of the present invention adopted to achieve the above object is to heat-shrink a blank supplied to the mouth of a container to be transported and seal the mouth of the container with a cap. The device includes a rotating wheel that rotates intermittently in the conveying direction in an upper vertical plane of a conveyor, suction heads provided on the outer circumferential surface of the wheel in a radially even manner, and conveyance at the lowest end of the suction head. It is characterized in that it is provided with a slip prevention belt that is provided opposite to the conveyor and presses and conveys both ends of the blank placed on the container mouth, This device heat-shrinks blanks supplied to the container to seal the container mouth with a cap, and includes a primary heat-shrinking part, a right-angle rotating part, and a secondary heat-shrinking part in series within the conveyance area of a conveyor. The primary and secondary heat shrinkage sections consist of a presser belt facing the conveyor surface and a pair of hot air nozzles installed on both sides of the conveyor. It is characterized in that it has a heat shrinkable part which is provided opposite to each other and acts on the side surface of the container, one belt rotates and the other belt is fixed.

[0007]

[Operation] When the mark detection sensor 13 detects a mark on the raw web 1 being sent out, the same web 1 stops,
After confirming that the suction head 3 is waiting at the position of the cutter die 29, the cutter section 20 is operated. The blank 2 punched by the cutter 25 is sucked and held by the suction head 3, and the rotary wheel 4 is intermittently rotated. The rotary wheel 4 sequentially rotates intermittently, and the blank 2 rotates while releasing the suction holding at the timing of the container 5 being conveyed by the conveyor 7 at a position just below the wheel 4, and the blank 2 is rotated at the opening of the container 5. supplied to In this case, the speed of the suction head 3 and the speed of the containers 5 on the conveyor 7 are synchronized.

[0008] Directly below the rotating wheel 4, there is a
Since the anti-slip belts 6, 6 are provided, the container 5
The blank 2, whose suction holding is released at the same timing as the blank 2, is pressed onto the container 5 by the belts 6, 6 and is conveyed by the conveyor 7. The blank 2 together with the container 5 is transferred from the anti-slip belts 6, 6 to the presser belts 8, 8, 8 on the conveyor 7, and passes through the primary heat shrinkage section 9. In the contraction section 9, primary thermal contraction is performed by hot air from contraction nozzles 91, 91.

The container 5 is rotated at right angles by the belts 101 and 102 in the right-angle rotation section 10 that it passes through, and then passes through the secondary heat shrinkage section 12. In the shrinkage section 12, secondary heat shrinkage is further performed by hot air from shrinkage nozzles 112, 112, and the heat shrinkage (cap seal) of the blank 2 placed on the container 5 is completed.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall view of the cap sealing device according to the present invention. The device includes a cutter section 20 that cuts a blank 2 from a raw material 1, and a blank supply section 30 that places a single blank 2 on the opening of a container. , a primary heat shrinkable part 9 , a right angle rotation part 10 , and a heat shrinkable part 40 including a secondary heat shrinkable part 12 .

The original fabric 1 is made of a heat-shrinkable film and is wound into a long roll. The same raw fabric 1 is sent out by a delivery roll 12 via a suitable guide roll 17, tension is adjusted via a dancer roll 14, passes through a mark detection sensor 13, and is supplied to a cutter section 20. As shown in FIG. 2, the cutter section 20 includes a cutter die 29, an annular cutter 25, and a cutting blank pressing piece 34.
The cutter 25 is fixed to the holder 24,
The holder 24 is a wheel 21 that is rotated by another drive source.
The cutter die 29 is connected to a rod 22 which is pivotally supported on a fulcrum 23 which is eccentrically provided, and is guided in a direction perpendicular to the surface of a cutter die 29 (as shown by the arrow C) by a guide (not shown) and driven to move forward and backward. Furthermore, the holder 24 has a film pressing piece 28.
are provided at four equal parts around the cutter 25, and the force of the spring 27 presses and holds the original film 1 to be cut by the cutter 25 against the die 29. An opening 29a is provided in the die 29 at a position facing the cutter 25, and a notch 29b is provided on the back surface of the die 29 so as to properly engage the rotating suction head 3.

[0012] The annular cutter 25 is an annular body with serrated teeth at the tip thereof, but is not limited to this, and may be used to punch out the blank 2 in accordance with the shape of the container opening. Good. The winding roll 16 is connected to the cutter section 2
The remaining film of the original fabric 1 after punching out the blank 2 at 0 is wound up via a feed roll 15 and a guide roll 17.

The blank 2 is cut into the raw material 1 by the cutter section 20.
At the same time as the blank is punched out, it is pushed down by the cutting blank pressing piece 34 and held by suction head 3 waiting below. The blank supply section 30 includes a rotary wheel 4 that rotates intermittently in the conveyance direction within a vertical plane above the conveyor 7, and a blank 2 that is supplied one by one.
It is equipped with a suction head 3 for suctioning and transferring the blank 2, and anti-slip belts 6, 6 for pressing and conveying the blank 2 placed on the container mouth onto an opposing conveyor 7.

The rotating wheel 4 is a plate-like donut-shaped wheel, which is disposed in a vertical plane on the conveyor 7, and is rotated in the direction of arrow A (conveying direction) by a drive device (not shown). Rotates intermittently. Same wheel 4
is provided with a plurality of suction heads 3 radially arranged on its outer periphery, and the suction heads 3 receive the cut blanks 2 at the position of the cutter section 20, and a transfer conveyor is installed at a position directly below the wheel 4. 7 and is arranged so as to face the opening of the container placed on the conveyor 7 and conveyed. The intermittent rotation of the wheel 4 is synchronized with the timing when the mouth of the container placed and conveyed on the conveyor 7 passes a predetermined position.

As shown in FIGS. 2 and 3, the suction head 3 engages the notch 29b at the cutter portion 20 with the blank holding surface 33 as the outer circumferential surface of the blank 2.
is received and held by suction on the blank holding surface 33. The intermittently rotating suction head 3 releases the suction and holding of the blank 2 in synchronization with the container 5 being conveyed by the conveyor 7 in the horizontal direction (arrow direction B) just below the rotating wheel 4 .

A suction port 31 is appropriately provided on the blank holding surface 33 of the suction head 3 , and the suction port 31 is connected to a suction hose 32 . The other end of the suction hose 32 is connected to the wheel 4 , and a negative pressure generation source is connected to the end surface of the wheel 4 in a sealed manner so that it can be connected to the other end of the suction hose 32 at a required position. . Suction groove (
(not shown) are connected or closed in synchronization with the The size of the blank holding surface 33 may be such that it can suction and hold the center of the blank 2, and it may be of any size so that both ends of the blank 2 can be pressed against the container opening by the slip prevention belts 6, 6. Good. Furthermore, since the blank holding surface 33 is formed into a curved surface with a radius concentric with the rotating wheel 4, when transferring the blank 2 onto the container 5, it is possible to transfer it smoothly from one end. .

As shown in FIG. 3, the anti-slip belts 6, 6 are positioned directly below the rotating wheel 4 and are attached to the suction head 3.
and container 5 are provided at a synchronized position. Same belt 6
, 6 are the blanks 2 being transferred onto the container 5 on the upper surface of the conveyor 7 that conveys the container 5 in the horizontal direction.
The conveyor 7 is provided facing and parallel to the conveyor 7 so as to press both ends of the conveyor 7. The belts 6, 6 are preferably heat-resistant thin synthetic resin or rubber belts, and are connected to the pulleys 61, 62 mounted on the cantilevered shafts 63, 64, respectively, and the roller 81 mounted on the belt drive shaft 82. The belts 6, 6 are continuously rotated in synchronization with the conveyor belt 7.

The conveyor 7 is a belt conveyor that passes directly below the wheel 4 and conveys the container 5 in the horizontal direction (arrow view B).The conveyor 7 then passes the container 5 through a heat shrink section 40 and seals the cap. After completion, the same container 5 is discharged. Presser belts 8, 8, 8 are attached to the roller 81 alternately with the anti-slip belts 6, 6 in between.
is passed around, the presser belts 8, 8, 8 face the conveyor 7, and the slip prevention belts 6, 6 press and convey the blank 2 on the container 5 onto the conveyor 7.
The blank 2 is conveyed under pressure onto a container 5 which continuously receives and passes through a heat shrinking section 40 in the same state.

As shown in FIGS. 1 and 4, the heat-shrinking section 40 includes a primary heat-shrinking section 9, a right-angle rotation section 10 for the container 5, and a secondary heat-shrinking section 12 within the conveyance area of the conveyor 7. , the presser belts 8, 8, 8 are suitable guide rolls 84,
84 , and the container 5 is guided by the primary heat shrinkage section 9 .
The blank 2 is pressed on top of the container 5, released in the right angle rotation part 10, and the blank 2 on top of the container 5 is again pressed and conveyed in the secondary heat shrinkage part 12.

In the primary heat shrinkage section 9 and the secondary heat shrinkage section 12, a pair of hot air nozzles 91, 91, 112, 112 are provided, respectively.
are provided on both sides of the conveyor 7, and jet suitable hot air from below the presser belts 8, 8, 8 to heat-shrink the blank 2 made of a heat-shrinkable film. FIG. 5 shows a cross-sectional view of the primary heat shrinkage section 9 perpendicular to the container transport direction. The hot air nozzle 91 has a slit shape and is provided at the tip of a nozzle body 92 as shown in FIG. is provided. A large number of fins 94 protrude from the main body 92 in the air passage 93 and heat the compressed air passing therethrough. That is, the air passage 93 is connected to a compressed air source by a pipe 95, and compressed air is sent continuously or intermittently as necessary to inject hot air onto the container 5 being conveyed by the conveyor 7. It becomes possible to do so.

It is sufficient that the secondary heat shrinkage section 12 has the same structure as the primary heat shrinkage section 9, and the hot air volume, hot air temperature, and hot air speed of the shrinkage sections 9 and 12 can be set as necessary. good. The right angle rotating part 10 is shown in FIGS. 6 and 7. The rotating part 10 is provided within the conveyance area of the conveyor 7 between the primary heat shrinkage part 9 and the secondary heat shrinkage part 12, and
A pair of belts 101 are attached to the container 5 that is placed on and transported.
, 102 to rotate the container 5 by an angle of approximately 90°.

As shown in FIG. 7, the mechanism of the right angle rotation part 10 is as shown in FIG.
, 102, one belt 101 is driven at a circumferential speed of 2V (V is the speed of the conveyor 7), and the other belt 102 is fixed at a circumferential speed of zero, so that it rotates at an angle of about 90° using frictional force. It becomes possible to do so. As shown in Figure 7, the dimensions of each location L, l, A, B, D, d0, d
1 and the angles are α, β, θ, and φ, the contact length 2L between the container 5 and the belt 101 is φ of the entire circumference of the container 5.
/2π, so the following equation 1 is obtained.

[0023]

[Math 1]

Furthermore, if there is a change in the diameter D of the container 5, it is necessary to slide the four pulleys 103 in FIG. 7 in a certain direction, and the value of B becomes the following equation 2.

[0025]

[Math 2]

By eliminating D from Equations 1 and 2, Equation 3 below is obtained, and the trajectories X and Y expressed by Equation 3 indicate the directions in which the four pulleys 103 slide.

[0027]

[Math 3]

Next, when calculating the circumferential length R of the belts 101 and 102, the following Equations 4 and 5 are obtained from FIG. 7, so the circumferential length R becomes the following Equation 6.

[0029]

[Math 4]

[0030]

[Math 5]

[0031]

[Math 6]

That is, for a device that rotates the container 5 by φ=π/2 (right angle), the circumferential length R of the belts 101 and 102 when the diameter D of the container 5 changes is calculated. Let D as a variable be 40≦D≦80 (mm), and d1 =
The values of A and R when d0 = 30 (mm) are shown in Table 1 below.

[0033]

[Table 1]

From Table 1, the diameter D of the container 5 is 40≦D≦8.
0, if A=143 (mm), belt 10
It can be said that the circumferential length R of 1,102 does not change much. The belt 101 is connected to the drive shaft of the conveyor 7, and is stretched around a drive pulley 104 whose circumferential speed is 2V, twice the conveyance speed V of the conveyor 7, and two slide pulleys 103, 103. Slide pulleys 103, 103 are connected to racks 107, 107, respectively.
It is rotatably supported by the racks 107, 107.
is guided by slide guides 108, 108 and is movable linearly in the directions of the orbits X and Y. Pinions 106, 106 are engaged with the racks 107, 107, and worm wheels 109, 109 are provided coaxially with the pinions 106, 106 and are connected to one worm gear 110.

The belt 102 is stretched around two slide pulleys 103, 103 made of the same mechanism as the belt 101, and a stop pulley 105 that does not rotate. If necessary, a brake device may be attached to the stop pulley 105 or the belt 102 to ensure that the rotation of the belt 102 is zero. 2 worm gears 110, 110
are coaxially arranged, and a handle 111 is attached to one end. That is, when the dimensions of the container 5 change, this can be handled by operating the handle 111 and moving the four slide pulleys linearly in the directions of the orbits X and Y.

[0036]

[Effects of the Invention] According to the cap seal device of the present invention,
The single cut blank 2 is supplied to the blank supply section 30
As a result, the blank 2 is accurately supplied to the container 5 without wrinkles or misalignment, and after being heat-shrinked in the primary heat shrinking section 9, the container 5 is
is rotated at right angles and is further heat-shrinked in the secondary heat-shrinking section 12, so necessary parts are heat-shrunk continuously and evenly in a short time, making it possible to create a cap seal with a good finish and an excellent aesthetic appearance. At the same time, it becomes possible to improve thermal efficiency in the heat shrink method.

[Brief explanation of drawings]

FIG. 1 is a side view showing the overall configuration of a cap seal device according to the present invention.

FIG. 2 is a detailed perspective view of the cutter section.

FIG. 3 is a perspective view of a blank supply section.

FIG. 4 is a plan view of a heat-shrinkable portion.

FIG. 5 is a cross-sectional view of the primary heat shrinkage section perpendicular to the container conveyance direction.

FIG. 6 is a schematic perspective view showing a mechanism of a right-angle rotating part.

FIG. 7 is an explanatory diagram for explaining the mechanism of the right-angle rotating section.

[Explanation of symbols]

1 Original fabric 2 Blank 3 Suction head 4 Rotating wheel 5 Container 6. Slip prevention belt 7 Conveyor 8 Presser belt 9 Primary heat shrinkage part 10 Right angle rotating part 12 Secondary heat shrinkage part 20 Cutter part 30 Blank supply section 40 Heat shrink part

Claims (2)

[Claims] 1. A device for cap-sealing the mouth of a container by heat-shrinking a blank supplied to the mouth of a container being conveyed, the apparatus comprising: a rotating wheel that rotates intermittently in the conveyance direction within a vertical plane above a conveyor; A suction head is arranged radially evenly on the outer circumferential surface of the wheel, and a suction head is installed at the lowest end of the same wheel, facing the conveyor, to press and convey both ends of the blank placed on the container mouth. A cap seal device characterized by comprising a belt for preventing slippage. 2. A device for cap-sealing a container mouth by heat-shrinking a blank supplied to the mouth of a container to be conveyed, the apparatus comprising a primary heat-shrinking part in series and a right-angle rotation part in a conveyance area of a conveyor. The primary and secondary heat shrink parts consist of a presser belt facing the conveyor surface of the conveyor, and a pair of hot air nozzles provided on both sides of the conveyor. The rotating part is characterized by having a heat-shrinkable part in which a pair of belts are provided facing each other on the conveyor and act on the side surface of the container, one belt rotates and the other belt is fixed. cap seal device.