JPH05132020A - Method and device for friction welding thermoplastic belt for binding - Google Patents

Abstract

PURPOSE:To make friction welding of a thermoplastic belt executable with a simple construction by a method wherein high-frequency, minute vibrations are applied to a piece of the thermoplastic belt positioned in the upper place of an overlapped part of the said belt while the pressure is applied to the overlapped part, and after contact surfaces of the overlapped part are heated and melted by friction, the overlapped part is cooled down by air blown thereto. CONSTITUTION:As a belt 90 is wound round an article and the opposite ends thereof are clamped, a pressure-receiving stand 45 is inserted to the underside of an overlapped belt 90 by operation of a cylinder 70. A face gate of a binding head leads the one end of the belt 90 for winding, and executes pulling back and tightening of the wound belt 90. Then the pressure is applied to the overlapped belt 90 with a pressure-applying swing arm 30 that is lowered by operation of a pressurizing cylinder 60, and the surface of an upper belt 90A of the overlapped belt is caught by biting with a sharp projection of a pressurizer 35 and at the same time, the undersurface of a lower belt 90B is caught by biting with a sharp projection of a projecting stand 46 of the pressure-receiving stand 45. By applying high-frequency, minute vibrations to the pressure-applying swing arm 30 by operation of a vibration- producing motor through an off-balance shaft 55 with the aforementioned state kept as it is, friction heat is produced between the belts 90A and 90B, and thereby the overlapped part of the belt is melted and welded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a friction welding device for heat-welding a superposed portion of a band which has been tightened by friction when the articles are circulated and bound by using a thermoplastic band.

[0002]

2. Description of the Related Art Conventionally, a bundling tool and a bundling machine for bundling articles by using a thermoplastic band (hereinafter simply referred to as a band) and putting them in a distribution process have been widely used. Joining technology has developed in a variety of ways and forms. That is, a seal sealing method in which a seal is covered and deformed to be bonded, a polymerized band is melted by heat, and a heat welding method of fixing and bonding is performed, and this heat welding method is a heat seal type in which heat is applied by a hot plate heater, Then, it is subdivided into an ultrasonic welding type in which ultrasonic energy is applied to the polymerized portion by heating and welding, and a frictional welding type in which frictional heat is generated by pressure-sliding the polymerized portions to generate self-heating welding. In any case, each method and each form has produced some results.

However, in the pursuit of more effective practicality, the material cost of using a metal seal in the seal-sealing system is high, binding flaws are generated on the surface of the article to be bound, and the bonding strength is based on the deformability of the thermoplastic band. Of the heat-sealing type in the heat-welding method, that is, the metal plate is heated by a nichrome wire heater to form a hot plate, and the band-polymerized portion is heated and welded by the hot plate, so The plate preheating time was required, the work efficiency was low, and when the plate was heated from the outside, the work environment was deteriorated due to the bad odor and smoke peculiar to the thermoplastic resin, and the work was not suitable for the bundling work. Further, the ultrasonic welding type is not always suitable for a device for binding a thermoplastic band which requires simplification and cost reduction because the ultrasonic generator has a complicated, expensive and large size tendency.

Under such circumstances, the friction welding type tends to be used relatively often. For example, Japanese Patent Publication No. 63-560.
No. 90, Japanese Examined Patent Publication No. 16723, JP-A No. 62-2878.
No. 11, Japanese Patent Laid-Open No. 3-97526 and the like, in the friction welding type band joining method or device, the joining mechanism is unnecessarily complicated and the device manufacturing cost is increased accordingly. Alternatively, it was complicated in handling and maintenance.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and an object thereof is to improve and develop a method and apparatus for friction welding of strips which are simple, inexpensive, easy to operate, and perform reliable joining. As a result of intensive studies and trials by the present inventor, the present invention has been provided.

[0006]

The present invention has dealt with by applying the following means in order to solve the above-mentioned problems. That is, as a method of friction welding of the strip, a suspension swing pressure member is applied to press the polymerized portion of the thermoplastic zone, and one upper sheet of the polymerized zone is vibrated at high speed in the width direction at a high speed to micro-oscillate the polymerized zone. A method in which the contact surfaces are heated to each other by friction and melted, air is blown to increase the cooling efficiency in the process of stopping the vibration and cooling and fixing the band overlapping portion, and maintaining the pressurization during the cooling and fixing time. On the other hand, a suspension swing pressure receiving member is applied to support the pressing force on the lower side of the band superposition section and at the same time, the lower one of the superposition zone is fixed against vibration to enhance the friction efficiency and the welding of the superposition zone is completed. After that, the belt was removed from the passage to simplify the belt passage when feeding the belt, and the welding was performed inexpensively, easily and reliably. Further, the friction welding device for the strip includes a pressurizing cylinder for pressurizing the overlapping portion of the strip through a pressurizing and swinging arm, and a pressurizer provided so as to be capable of microvibration under the pressurization of the pressurizing cylinder. A pressure swinging arm, a swinging motor that causes the pressure swinging arm to vibrate at high speed in the band width direction through an eccentric swinging shaft, and a pressure force of the pressure swinging arm that is aligned and supported below the overlapping zone. And, a pressure swinging arm including a pressure receiving base that can be retracted from the lower side of the overlapping zone, an air cylinder that aligns the pressure swinging arm in the band passage and retracts, and an air nozzle for enhancing the cooling effect during band welding. And a projection surface having a sharp projection is provided on the lower surface of the pressurizing member and the upper surface of the pressure receiving table, so that the overlapped portion can be surely friction-welded without impairing the tightening force of the belt.

[0007]

The operation of the method for friction welding of the thermoplastic band for binding (hereinafter simply referred to as the present method) and the apparatus therefor (hereinafter simply referred to as the present apparatus) will be briefly described.

The operation of this method is to support the overlapped portion of the strip by a suspension type pressure swing member, and pressurize the overlap portion of the strip with a suspension type pressurizing and melting member, while pressing one sheet above the overlapped zone. High-speed micro-vibration (200-300 Hertz) is applied in the width direction, and the lower sheet of the superposition zone is fixed with respect to the high-speed micro-vibration. The temperature rises due to heat generation and becomes a molten state at the band contact surface and the required depth. At this point, the vibration operation is stopped, and compressed air is blown to the melting section and the upper and lower members while maintaining the pressurized state, resulting in rapid cooling. ,
The strip achieves rapid and strong welding. In addition, the suspension type pressure receiving and swinging member is capable of smoothly responding to the belt feeding after the withdrawal from the overlapping portion after welding.

The operation of the present apparatus is such that the pressurizing element of the pressure swinging arm suspended on the frame so as to swing is applied to the overlapping portion of the intervening belt with the pressure receiving table of the pressure receiving swinging arm aligned below the belt overlapping portion as a support. Pressurizing with a pressure cylinder, at this time, the upper upper surface of the stacking band is strongly caught by the sharp projections on the lower surface of the presser, and the lower lower surface is completely caught and fixed by the sharp projections on the pressure receiving table. Be converted. In addition, the pressure receiving and swinging arm aligns the pressure receiving base under the stacking zone and retreats by the pressure receiving base aligning cylinder. Here, the swinging motor swings the pressure swinging arm through the swinging eccentric shaft at a high speed of 10,000 times per minute, and this swinging is reasonably high speed to be expressed as vibration. Thus, the upper side of the polymerization zone is high-speed micro-vibration, and heat generated by friction and temperature rise melts the contact surface of the polymerization zone to reach a certain depth. When compressed air is blown from the air nozzle while being held and rapidly cooled, the band superposition portion is cooled and solidified and welded. Thus, welding is completed by raising the pressurizing cylinder and retracting the pressure receiving table aligning cylinder. In addition,
The limit arm provided on the pressurizer cooperates with the side plate to prevent an empty contact between the pressurizer and the pressure receiving table and prevent damage to the sharp protrusions.

Although the method and the apparatus are vertical in the course of the description, all the power is supplied power and not gravity utilization, so the method and the apparatus are horizontal or oblique, and even inverted. The application as is that there is no hindrance and can be used in various ways.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a device embodying the method of the present invention will be described below.
Examples will be described in detail with reference to the drawings.

FIG. 1 is a partial front sectional view of the present apparatus 1,
FIG. 2 shows a side sectional view taken along the line AA of FIG.
The device 1 includes a frame 10, a side plate 20, a pressure swing arm 30, a pressure swing arm 40, a swing motor 50, a pressure cylinder 60,
The pressure receiving table alignment cylinder 70 is a main component, and the frame 10 and the side plate 20 form a box type.
A pressure swing arm 30 and a pressure swing arm 40 are housed inside, and a swing motor 50 as a power source, a pressure cylinder 60, and a pressure receiving table alignment cylinder 70 are attached to the outside.

The pressure swing arm 30 is shown in FIG. 3 as a front view and in FIG. 4 as a side sectional view taken along the line BB in FIG. 3, but a pressure cylinder 60 is provided above the arm portion 30A. Of the piston rod 62, a pin hole 31 for swingably connecting to a pin hole 61 formed at the tip of the piston rod 62, and a swinging long hole 32 for accommodating a swinging eccentric shaft 55 rotatably below the arm portion 30A, an arm. The lower end of the portion 30A is provided with pin holes 33 for axially mounting a pressurizer 35, which will be described later, and the pressurizer 35 divided for convenience of processing is shown in FIG. 5 is a side sectional view taken along the line CC of FIG. 5, a bottom view of FIG. 7, and a line DD of FIG.
As shown as a partially enlarged cross-sectional view taken along the line EE, each pin has a pin hole 36 for pivotally attaching to the lower end pin hole 33 of the arm portion 30A, and the four corners have side holes to be described later. A limit arm 37 for regulating the lower limit of the pressurizing stroke in cooperation with the limit arm receiver 25 of the plate 20 is provided, a projection surface 38 is formed on the bottom surface, and sharp projections 39 (see FIG. 9) are arranged to form a belt. It is designed to have a sufficient catching effect so that it can bite into 90 and slide the belt 90 securely.

FIG. 9 is a front sectional view of the pressure cylinder 60 and FIG. 10 is a plan view thereof. In this embodiment, compressed air is used. The stroke may be relatively small. A mounting hole 63 for mounting on the frame 10 is provided on the outer wall of the cylinder so as to be connected to the frame 10.

FIG. 11 shows a side view of the swing eccentric shaft 55, and FIG.
12 is a rear view taken along the line FF of FIG.
A front view from the direction of the arrow G is shown in Fig. 13. The swing eccentric shaft
55 has a spline hole 56 for engaging with the output spline shaft of the rocking motor 50, which is bored in the inner diameter of one shaft portion 57 to form a hollow body as a whole. The shaft portion 57 is axially attached to the eccentric bearing 21 of the side plate 20, and the eccentric portion 58 rotatably engages with the swinging long hole 32 of the pressure swinging arm 30 to cause the pressure swinging arm 30 to vibrate at high speed. It is a thing.

FIG. 14 shows a partial front view of the pressure swing arm 40, and FIG. 15 shows a side view thereof. The pressure swing arm 40 including the pressure receiving base 45 divided for the convenience of processing is located above the arm portion 40A. The pin hole 4 for pivotally mounting the frame 10 with a pin
1. Below the arm portion 40A, a pin hole 42 for connecting with a piston rod 71 of a pressure receiving table alignment cylinder 70 by a pin, and the piston rod 71 aligns the pressure swinging arm 40 below the overlapping portion of the belt 90, A recessed hole 44 is provided for the purpose of providing an escape space for displacement when swinging to retract, and a pressure receiving base mounting screw hole 43 for mounting the pressure receiving base 45 at the lower end of the arm 40A. , Each has. Now,
16 is a front view, FIG. 17 is a plan view, and FIG. 18 is a plan view.
Although it is shown as a cross-sectional view taken along the line H-H of FIG. 3, it is equipped with a mounting hole 43 ′, a protruding die mounting hole 47 ′, and a protruding die recess 46 ′ for accommodating a protruding die 46 described later, and is made in a shoe shape. There is. The protrusion die 46 is shown in a front view in FIG. 19, a plan view in FIG. 20, and FIG.
Although it is shown as a partially enlarged cross-sectional view taken along line I-I and line J-J of FIG. Is formed. Then, it is aligned with the lower side of the superposed zone of the belt 90 and bites into the lower side of the superposed zone to firmly hold it against high-speed minute sliding.

As the swing motor 50, an air motor is applied in this embodiment, but the invention is not limited to this, and an electric universal motor can also be applied.

As the pressure receiving table aligning cylinder 70, an air cylinder is applied in this embodiment, but it is not particularly limited to that using compressed air. This pressure stand alignment cylinder 70
In order to improve the alignment efficiency of the pressure swing arm 40, the frame 10 is attached to the frame 10 with an appropriate inclination angle with respect to the pressure direction of the pressure swing arm 30.

The side plate 20 is shown in FIG.
22 is a side sectional view taken along the line KK of FIG. 22, and FIG.
-Although shown as partial cross-sectional views as seen from the direction of the arrow L, the pin eccentric bearing 21 and the pin swing hole 2 for avoiding the movement stroke of the pin for connecting the pressure swing arm 30 with the piston rod 62 2
2, appropriate holes such as mounting holes 28, 28 to the frame 10 are made, but the important point here is that the limit arm receiver 25 provided on the pressurizer 35 of the pressure swing arm 30 described above is provided. And
This completely prevents the sharp projections 39, 49 from coming into contact with the air.

25 and 26, the limit arm support 25 is shown.
A detailed view for explaining the regulation effect of the limit arm 37 is shown.

As shown in FIG. 1, the air nozzle 75 is a pressure receiving base.
The upper part of the alignment of 45 and the lower part of the presser
It is attached to the frame 10 by selecting a position such that compressed air is blown in the vicinity of 90, and an appropriate pipe diameter is applied. By blowing air with this air nozzle, the cooling effect of the melting zone becomes extremely good.

27 and 28 are explanatory views showing the relationship between the superposition zone 90, the pressurizer 35, and the pressure receiving base 45, which are provided for explaining the operation of the present apparatus which will be described later.

FIG. 29 shows a bundling head 80 to which the present apparatus 1 is applied.
Although the front view of is illustrated as an example, the face gate 81,
Band feeding and tightening device 82, shear 83, clamp 84, air motor
The device 1 is arranged in combination with an 85, an air cylinder 86, etc. as a “key” for bundling articles by a belt.

FIG. 30 shows the position of the operation of the present apparatus 1 as a cycle time chart of each mechanical element in the above-mentioned binding head 80.

The control of the present apparatus 1 is performed by a control device provided separately including the binding head 80.

The operation of the apparatus 1 will be described with reference to the cycle time chart (FIG. 30) of the binding head 80 described above.

As shown in FIG. 30, when the belt 90 travels around the article at a high speed and the front end is clamped, the pressure receiving base of the present apparatus.
The 45 is inserted and aligned in the state shown in FIG. 27 on the lower side of the overlapping zone 90 by pushing out the pressure swing arm by the pressure receiving table aligning cylinder 70. Thus, since the face gate 81 of the binding head 80 has guided the tip of the belt 90 and completed the circulation, it is opened for use and the belt 90 is pulled back and tightened. Thus, the pressure swing arm 30 of the present device 1 descends by the pressure cylinder 60 to pressurize the superposition zone 90, and the sharp projection 39 of the pressurizer 35 digs into the surface of the upper side belt 90A and catches it. The protrusion die 46 of the pressure receiving base 45 causes the sharp protrusion 49 to bite into the lower surface of the side band 90B and catches it. Thus, the swing motor 50 starts to rotate under the pressure of the pressurizer 35, and the pressure swing arm 30 is caused to vibrate at a high speed through the swing eccentric shaft 55, and the upper strip 90A of the overlapping zone 90 is inevitably generated. However, it vibrates in the width direction 10,000 times per minute,
The surface of 90B is heated and melted by the generation of frictional heat. The time until melting depends on the material and thickness of the strip. At this time, since the vibration is not in the longitudinal direction of the belt 90, that is, in the direction in which tension is applied, the vibration is smoothly performed. Thus, when the rotation of the swing motor 50 is stopped and the vibration is stopped, the belt 90 does not have a heat source, so that cooling is started, and in addition, the compressed air is rapidly cooled and solidified and welded. The trailing strip 90 is cut near the end point of cooling, but the cutting time by the shear 83 is
It may be carried out at the time of catching the polymerized part by 39 and 49, but in the present embodiment, it was set as the end point of cooling fixation. Thus, although the shear 83 is raised and the clamp 84 is opened by the binding head 80, also in the present device 1, the pressure swing arm 30 is lifted by the pressure cylinder 60 and the pressure receiver 45 is moved away by the pressure receiver alignment cylinder 70. The operation of the device 1 is completed, but the binding head
In 80, the face gate 81 is closed and the one-cycle bundling is completed.

As shown in FIG. 25 and FIG. 26, the present device 1 includes the limit arm receiver 25 of the side plate 20 and the pressurizer 35.
Even if the pressure swing arm 30 is lowered to the lowermost position, a gap R is maintained between the protruding surface 38 of the lower surface of the pressurizer and the protruding surface 48 of the pressure receiving base 35 by the cooperation of the limit arm 37 of FIG. It is configured as follows.
This is because the limit arm 37 comes into contact with the limit arm receiver 25 at the Q point and restricts its descending.

[0029]

By implementing the method and apparatus of the present invention,
The advantages of friction heat welding, such as connecting parts (seals, etc.), do not require preheating time, and the work environment such as foul odor is reduced in the circulation bundling of articles with thermoplastic bands. The approach to solve the problem and fully exert its effect is achieved by an extremely simple method and mechanism. In addition, reliable friction welding is quickly and smoothly performed, and the cost of equipment is low. Combined with easy maintenance and easy handling and handling, it will greatly contribute to a wide range of future application to the field of binding of articles by the thermoplastic belt, and the effect can be said to be extremely remarkable.

[Brief description of drawings]

[Summary] All the drawings show embodiments of the present invention.

FIG. 1 is a front partial cross-sectional view of the present device.

FIG. 2 is a side cross-sectional view of the present device, taken along the line AA of FIG.

FIG. 3 is a front view of a pressure swing arm.

FIG. 4 is a sectional view taken along the line BB of FIG.

FIG. 5 is a front view of a presser.

6 is a sectional view taken along the line CC of FIG.

FIG. 7 is a bottom view of the presser.

8 is an enlarged cross-sectional view taken along arrows DD and EE in FIG.

FIG. 9 is a front sectional view of a pressure cylinder.

FIG. 10 is a plan view of a pressure cylinder.

FIG. 11 is a side view of a swing eccentric shaft.

12 is a rear view of the swinging eccentric shaft as viewed from the arrow FF of FIG. 11.

13 is a front view of the swinging eccentric shaft taken along the line GG in FIG.

FIG. 14 is a front view of a pressure receiving swing arm.

FIG. 15 is a side view of a pressure swing arm.

FIG. 16 is a front view of a pressure receiving table.

FIG. 17 is a plan view of a pressure receiving table.

18 is a cross-sectional view taken along the line HH of FIG.

FIG. 19 is a front view of a protrusion die.

FIG. 20 is a plan view of a protrusion die.

21 is an enlarged cross-sectional view taken along arrows I-I and J-J of FIG. 20.

FIG. 22 is a front view of a side plate.

23 is a side cross-sectional view of the side plate, which is indicated by K in FIG.
-By K arrow.

24 is a partial enlarged cross-sectional view taken along the line LL in FIG.

FIG. 25 is an explanatory diagram showing a relative relationship between a limit arm and a limit arm receiver.

26 is a sectional view taken along the line P-P of FIG. 25.

FIG. 27 is an explanatory diagram showing a welding mechanism of a band overlapping portion.

28 is a cross-sectional view taken along the line SS in FIG. 27.

FIG. 29 is a front view of a binding head equipped with the present device.

FIG. 30 is a cycle time chart of a binding head equipped with the present device.

[Explanation of symbols]

1 device 10 frame 20
Side plate 21 Swing eccentric bearing 25 Limit arm bearing 28
Mounting hole 30 Pressure swing arm 31 Pin hole 32
Swing long hole 33 Pin hole 35 Presser 36
Pin hole 37 Limit arm 38 Projection surface 39
Sharp protrusion 40 Pressure swing arm 43 Pressure mount mounting screw hole 4
3'pressure receiver mounting hole 44 countersunk hole 45 pressure receiver 46
Projection die 46 'Projection die recess 47 Projection die mounting hole 48
Projection surface 49 Sharp projection 50 Swing motor 55
Swing eccentric shaft 56 Spline hole 57 Shaft 60
Pressure cylinder 61 Pin hole 62 Piston rod 63
Mounting hole 70 Pressure receiving table alignment cylinder 80 Binding head 81
Face gate 82 Belt tightening device 83 Shear 84
Clamp 85 Air motor 86 Air cylinder 90
band.

Claims (2)

[Claims] 1. A method of friction welding a polymerized portion of a thermoplastic band, which is wound and tightened around an article, wherein a suspension pressure swing member is applied to press the polymerized portion of the thermoplastic band, while the upper side of the polymerized band is applied. One of the sheets is vibrated at a high speed in the width direction, the contact surfaces of the superposed zones are heated and melted by friction, and the air is blown to increase the cooling efficiency in the process of stopping the oscillation and cooling and fixing the superposed zones. And, while maintaining the pressurization during the cooling and fixing time, a suspension pressure swing member is applied to support the pressurizing force on the lower side of the band superimposing portion and one sheet on the lower side of the superimposing band is applied. Fixes against vibration to improve friction efficiency, and withdraws from the passage of the belt after completion of welding of the polymerization zone, simplifies the belt passage during feeding of the belt, suspends vertical pressurization, efficient melting by width direction vibration, and air Achieving sticking by rapid cooling with spraying. And a method for welding a thermoplastic band for binding. 2. A device for friction welding a superposed portion of a thermoplastic band, which is formed by rotating and tightening an article, and a pressurizing cylinder for pressurizing the superposed part of the strip through a pressure swing arm, which will be described later, and the pressurizing cylinder. A pressure swing arm including a pressure element that is capable of minute vibration under the pressure of, a swing motor that applies high-speed minute vibration in the band width direction to the pressure swing arm via an eccentric swing shaft, and Aligning and supporting the pressure force of the pressure swing arm on the lower side of the superposition zone,
And a pressure receiving swing arm including a pressure receiving base that can be retracted from the lower side of the stacking zone, an air cylinder that allows the pressure swinging arm to be aligned with respect to the band passage and move away, and an air nozzle for enhancing cooling efficiency during band welding. For binding, the lower surface of the pressurizer and the upper surface of the pressure receiving table are provided with projection surfaces having sharp projections so that the overlapped portion can be frictionally welded reliably and quickly without impairing the band tightening force. Welding device for thermoplastic bands.