阅读说明：本技术 一种改进的超音波肩带加工装置及使用方法 (Improved ultrasonic shoulder strap processing device and using method ) 是由 张荣龙 张伟英 吴许昌 肖丽娟 于 2019-10-18 设计创作，主要内容包括：本发明公开一种改进的超音波肩带加工装置及使用方法,其包括超音波仪器和肩带加工组件,肩带加工组件包括载台、刀模、挡条及盖板,刀模包括相对设置的刀具,两个刀具沿载台的长度方向延伸,且两个刀具之间形成凹槽,凹槽内设置有防滑垫；挡条用于与放置在凹槽上的第一面料抵触,使得第一面料部分容置在凹槽内；盖板上设置有与所述凹槽配合的开槽,开槽的延伸方向与凹槽的延伸方向一致,盖板用于与第二面料抵触,使得第二面料部分设置在凹槽上且与设置在凹槽内的第一面料上下相对设置。本发明通过使用超音波仪器及肩带加工组件,获得成品的两侧止口均匀、止口直顺、外观平服,不仅大大降低操作难度,且在保证产品质量的同时提高生产效率。(The invention discloses an improved ultrasonic shoulder strap processing device and a use method thereof, and the improved ultrasonic shoulder strap processing device comprises an ultrasonic instrument and a shoulder strap processing assembly, wherein the shoulder strap processing assembly comprises a carrying platform, a cutting die, a barrier strip and a cover plate, the cutting die comprises oppositely arranged cutters, the two cutters extend along the length direction of the carrying platform, a groove is formed between the two cutters, and an anti-skid pad is arranged in the groove; the barrier strip is used for abutting against the first fabric placed on the groove, so that the first fabric is partially accommodated in the groove; be provided with on the apron with recess complex fluting, the extending direction of fluting is unanimous with the extending direction of recess, and the apron is used for contradicting with the second panel for second panel part sets up on the recess and relative setting from top to bottom with the first panel that sets up in the recess. According to the invention, by using the ultrasonic instrument and the shoulder strap processing assembly, the finished product with uniform rabbets on two sides, straight and smooth rabbets and flat appearance is obtained, the operation difficulty is greatly reduced, and the production efficiency is improved while the product quality is ensured.)

1. The improved ultrasonic shoulder strap processing device is characterized by comprising a shoulder strap processing assembly and an ultrasonic instrument, wherein the shoulder strap processing assembly comprises a carrying platform (1), a cutting die, a barrier strip (3) and a cover plate (4), the cutting die is arranged on the carrying platform (1), the cutting die comprises cutters (2) which are oppositely arranged, the two cutters (2) extend along the length direction of the carrying platform (1), a preset distance is kept between the two cutters (2), so that a groove (5) is formed between the two cutters (2), a non-slip pad is arranged in the groove (5), and the non-slip pad extends along the length direction of the groove (5); the barrier strips (3) are used for abutting against the first fabric (7) placed on the grooves (5) so that the first fabric (7) is partially accommodated in the grooves (5);

the cover plate (4) is provided with a slot (6) matched with the groove (5), the extending direction of the slot (6) is consistent with the extending direction of the groove (5), the width of the slot (6) is larger than or equal to that of the groove (5), and the cover plate (4) is used for abutting against a second fabric (8) so that part of the second fabric (8) is arranged on the groove (5) and is vertically opposite to the first fabric (7) arranged in the groove (5);

the ultrasonic device is used for cutting the second fabric and the first fabric on the two cutters, and the first fabric arranged in the groove (5) and the second fabric (8) arranged opposite to the first fabric are attached to form a whole.

2. The improved ultrasonic shoulder strap processing device of claim 1 wherein the non-slip pad is made of sponge or other fabric.

3. The improved ultrasonic shoulder strap processing apparatus according to claim 1, wherein the cutter (2) has a long and thin structure, and the cutter (2) is disposed perpendicular to the carrier (1).

4. The improved ultrasonic shoulder strap processing device according to claim 1, wherein the barrier strip (3) comprises a fixing portion (31) and a resisting portion (32), the fixing portion (31) and the resisting portion (32) are vertically arranged, so that the barrier strip (3) forms a T-shaped structure; the resisting part (32) is of a long strip-shaped structure, and the width of the resisting part (32) is smaller than or equal to that of the groove (5).

5. The improved ultrasonic shoulder strap processing device according to claim 1, wherein both of the two tools (2) are detachably provided on the stage (1).

6. The improved ultrasonic shoulder belt processing device according to claim 1, wherein the carrier (1) is provided with a plurality of fixing grooves, a predetermined distance is maintained between the fixing grooves, and the fixing grooves are used for fixing the cutter (2).

7. The improved ultrasonic shoulder strap processing device as set forth in claim 1, wherein the cover plate (4) is made of a transparent material.

8. The improved ultrasonic shoulder strap processing apparatus as set forth in claim 1 wherein said ultrasonic instrument comprises an ultrasonic processing head.

9. A method of using the improved ultrasonic shoulder strap processing apparatus of any one of claims 1-7, comprising the steps of:

s1, placing the first fabric on the groove, enabling the barrier strip to abut against the first fabric to enable the first fabric to be pressed in the groove by the barrier strip, and enabling other parts of the first fabric to be arranged on two sides outside the groove;

s2, firstly, placing the second fabric above the groove in the step S1, and then sleeving the cover plate outside the groove, so that the part of the second fabric is arranged on the groove and is vertically opposite to the first fabric arranged in the groove, and the other parts of the second fabric are arranged on the two sides outside the groove and are abutted against the other parts of the first fabric arranged on the two sides outside the groove in the step S1;

and S3, performing ultrasonic cutting on the position of the cutting die on which the second fabric is placed in the step S2 by an ultrasonic instrument to obtain a shoulder strap with two sides provided with rabbets, wherein the rabbets extend along the length direction of the shoulder strap.

10. The improved ultrasonic shoulder strap processing apparatus as claimed in claim 9, wherein said shoulder strap has a seam allowance width L_{Stop block}Calculated by the following formula:

L_{stop block}＝H-(T₁+T₂+T₃)

Wherein H is the height of the cutter (2) and T₁Is the thickness, T, of the first fabric (7)₂Is the thickness, T, of the second fabric (8)₃The thickness of the non-slip mat.

Technical Field

The invention relates to the field of fabric processing and production systems, in particular to an improved ultrasonic shoulder belt processing device and a using method thereof.

Background

At present, the operation process of sewing two binding strips (i.e. fabric) with different widths or different colors together is as follows: firstly, two bundles of strips are flatly placed on an ultrasonic machine, the ultrasonic is operated by a roller, and a first straight line is firstly taken. Due to the special style, when the ultrasonic wave is transmitted along the second straight line, the lower layer of the super-fine binding strip at the seam allowance at one side of the ultrasonic wave transmitted by the ultrasonic wave is required to be added by 0.4cm to the upper layer of the ultrasonic wave transmitted by the ultrasonic wave at the other side of the ultrasonic wave. When the second ultrasonic wave is sent, the lower layer superfine on the left side is ensured to be more than the surface layer superfine by 0.4cm, and the ultrasonic wave is sent on the right side to ensure that the seam allowance is straight and smooth. The difficulty is extremely high when the original equipment is operated, the seam allowance is not smooth easily, the fabric is not flat and waves due to uneven operation gestures of the upper layer and the lower layer during sewing, and the difference between the two layers is difficult to control by 0.4cm, so that the two layers are uneven. In the operation process, the operation fatigue of the staff is greatly improved, the workshop efficiency cannot be guaranteed, and the product quality is influenced.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides an improved ultrasonic shoulder belt processing device, which is used for solving the problems of unsmooth seam allowance and uneven seam allowance of a product caused by the reason that the seam allowance is not controlled in place and gesture control is not controlled in place, and the technical scheme is as follows:

the invention provides an improved ultrasonic shoulder strap processing device which comprises a shoulder strap processing assembly and an ultrasonic instrument, wherein the shoulder strap processing assembly comprises a carrying platform, a cutting die, a blocking strip and a cover plate, the cutting die is arranged on the carrying platform and comprises oppositely arranged cutters, the two cutters extend along the length direction of the carrying platform, a preset distance is kept between the two cutters, so that a groove is formed between the two cutters, an anti-skid pad is arranged in the groove, and the anti-skid pad extends along the length direction of the groove; the barrier strip is used for abutting against the first fabric placed on the groove, so that the first fabric is partially accommodated in the groove; the cover plate is provided with a slot matched with the groove, the extending direction of the slot is consistent with the extending direction of the groove, the width of the slot is more than or equal to that of the groove, and the cover plate is used for abutting against a second fabric, so that the second fabric is partially arranged on the groove and is vertically opposite to the first fabric arranged in the groove; the ultrasonic wave instrument is used for cutting the second fabric and the first fabric on the two cutters, and enables the first fabric arranged in the groove and the second fabric arranged opposite to the first fabric to be attached into a whole.

Further, the non-slip mat is made of sponge or other fabrics.

Further, the cutter is of an elongated structure, and the cutter is perpendicular to the carrier.

Furthermore, the barrier strip comprises a fixing part and a resisting part, and the fixing part and the resisting part are vertically arranged so that the barrier strip forms a T-shaped structure; the blocking part is of a long strip-shaped structure, and the width of the blocking part is smaller than or equal to that of the groove.

Further, the two cutters are detachably arranged on the carrier.

Further, the carrying platform is provided with a plurality of fixing grooves, a preset distance is kept between the plurality of fixing grooves, and the fixing grooves are used for fixing the cutter.

Further, the cover plate is made of transparent materials.

Further, the ultrasonic instrument includes an ultrasonic processing head.

The present invention also provides a method for using the improved ultrasonic shoulder strap processing device, which comprises the following steps:

s1, placing the first fabric on the groove, enabling the barrier strip to abut against the first fabric to enable the first fabric to be pressed in the groove by the barrier strip, and enabling other parts of the first fabric to be arranged on two sides outside the groove;

s2, firstly, placing the second fabric above the groove in the step S1, and then sleeving the cover plate outside the groove, so that the part of the second fabric is arranged on the groove and is vertically opposite to the first fabric arranged in the groove, and the other parts of the second fabric are arranged on the two sides outside the groove and are abutted against the other parts of the first fabric arranged on the two sides outside the groove in the step S1;

and S3, performing ultrasonic cutting on the position of the cutting die on which the second fabric is placed in the step S2 by an ultrasonic instrument to obtain a shoulder strap with two sides provided with rabbets, wherein the rabbets extend along the length direction of the shoulder strap.

Further, the width L of the seam allowance at one side of the shoulder strap_{Stop block}Calculated by the following formula:

L_{stop block}＝H-(T₁+T₂+T₃)

Wherein H is the height of the tool, T₁Is the thickness, T, of the first fabric₂Is the thickness, T, of the second fabric₃Is the thickness of the non-slip mat.

The technical scheme provided by the invention has the following beneficial effects:

a. according to the invention, by using the ultrasonic instrument and the shoulder strap processing assembly, the original two bundling strips with different widths or different colors are changed from roller ultrasonic operation to operation on the plane carrying platform, so that the obtained finished product has uniform rabbets on two sides, straight and smooth rabbets and flat appearance, the rabbets on two sides can be equal in width, the product has attractive and fine appearance, the operation difficulty is greatly reduced, the requirement on the skill of staff is greatly reduced, and the production efficiency is improved while the product quality is ensured;

b. the ultrasonic shoulder strap processing device provided by the invention has the advantages of simple structure, high operation reliability, reduction of fatigue of staff and wide applicability.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a perspective view of an improved ultrasonic shoulder strap processing apparatus according to an embodiment of the present invention;

FIG. 2 is a side view of an improved ultrasonic shoulder strap processing apparatus provided in accordance with an embodiment of the present invention;

FIG. 3 is a front view of a stop bar of the improved ultrasonic shoulder belt processing apparatus according to the present invention;

figure 4 is a front view of the shoulder strap of the final product provided by the embodiment of the present invention.

Wherein the reference numerals include: 1-carrying platform, 2-cutter, 3-barrier strip, 31-fixing part, 32-resisting part, 4-cover plate, 5-groove, 6-slotting, 7-first fabric and 8-second fabric.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.

The improved ultrasonic shoulder strap processing device provided by the invention is used for sewing two binding strips (the binding strips are fabrics) with different widths or different colors into an integral structure to form shoulder straps with rabbets at two sides (the rabbets at the two sides can ensure the equal width), and the shoulder straps are used for underwear bras, schoolbag, backpack or other fields needing the shoulder straps.

In an embodiment of the present invention, an improved ultrasonic shoulder strap processing apparatus is provided, and with reference to fig. 1 and fig. 2 in specific structure, the shoulder strap processing assembly includes a carrier 1, a cutting die 2 disposed on the carrier 1, a stop strip 3, and a cover plate 4, the carrier 1 is a planar structure, the cutting die includes oppositely disposed cutters 2, the cutters 2 are blades, the blades are thin, both the cutters 2 extend along a length direction of the carrier 1, and a preset distance is maintained between the cutters 2, so that a groove 5 is formed between the cutters 2, and both ends of the groove 5 along the length direction of the cutters 2 are open structures; the cutter 2 is of an elongated structure, and the cutter 2 is perpendicular to the carrier 1.

The barrier strip 3 can be arranged in the groove 5, the resisting part 32 is of a strip-shaped structure, and the resisting part 32 needs to be placed in the groove to press the shoulder strap, so that the width of the resisting part 32 is smaller than or equal to the width of the groove 5, and the width of the groove is the distance between the two cutters. The barrier strip 3 is used for abutting against the first fabric 7 placed on the groove 5, so that part of the first fabric 7 is accommodated in the groove 5 (the first fabric 7 is placed on the groove 5, and then the barrier strip 3 abuts against the first fabric 7, so that part of the first fabric 7 is pressed in the groove by the barrier strip 3, namely the barrier strip is clamped between the two cutters), at this time, the abutting part is also arranged in the groove, and other parts of the first fabric 7 are arranged on two sides outside the groove, namely on the carrying platform); the barrier strip 3 comprises a fixing part 31 and a resisting part 32, the specific structure of the barrier strip is shown in fig. 3, and the fixing part 31 and the resisting part 32 are vertically arranged, so that the barrier strip 3 forms a T-shaped structure; the barrier strip 3 may be made of a plastic material or a metal material, and has a certain weight, so that the barrier strip 3 presses the first fabric 7 accommodated in the groove 5, so that the first fabric does not move. The barrier strip has the following functions: the two layers of fabrics are separated, the amount of the surface layer needing to be increased is separated by the barrier strip, the amount of the first fabrics 7 needing to be increased can be uniformly controlled by the barrier strip, the operation is convenient, and the quality is ensured. The carrying platform is provided with a slot for accommodating the fixing part 31, and when the resisting part 32 of the barrier strip 3 is placed in the groove to resist against the shoulder strap, the barrier strip 3 can be limited to move along the length direction and the width direction of the groove, so that the first fabric can be better fixed. When the fixing portion 31 is placed in the groove on the carrier, one end of the blocking portion 32 can be bonded to the surface of the carrier by using an adhesive tape or other bonding materials, so that the blocking portion 32 can be conveniently lifted and lowered, the blocking strip 3 is prevented from being separated from the carrier, and the effect of fixing the first fabric is achieved.

When placing first surface fabric, be provided with the slipmat earlier in the recess 5, the slipmat is followed the length direction of recess 5 extends, the slipmat is made by sponge or other surface fabrics, plays anti-skidding effect, places the slipmat earlier in the recess, places first surface fabric again, and first surface fabric part is pressed the back in the recess by the blend stop, has set up the slipmat, in operation process behind, can prevent effectively that first surface fabric from removing along the length direction and the width direction of recess, and then ensures that later stage tang control is accurate.

Further, the two cutters 2 are detachably arranged on the carrier 1, the carrier 1 is provided with a plurality of fixing grooves, a preset distance is kept between the fixing grooves, the fixing grooves are used for fixing the cutters 2, when the width of the required first fabric 7 is changed, correspondingly, the distance between the two cutters needs to be adjusted, and the cutters can be placed in different fixing grooves, so that the distance between the two cutters is the same as the width of the required first fabric 7. Alternatively, the tool 2 may be attached to the carrier by using glue, or the tool 2 may be fixed to the carrier by other methods.

The specific structure of the cover plate 4 is as follows: cover plate structure referring to fig. 1, a slot 6 matched with the groove 5 is arranged on the cover plate 4, the slot 6 extends along the length direction of the groove 5, the extending direction of the slot 6 is consistent with the extending direction of the groove 5, the width of the slot 6 is greater than or equal to the width of the groove 5, preferably, the width of the slot 6 is slightly greater than the width of the groove 5, the cover plate 4 is used for abutting against a second fabric 8, so that a part of the second fabric 8 is arranged on the groove 5 and is arranged opposite to the first fabric 7 arranged in the groove 5 up and down (a gap is formed between the two parts), specifically, the part of the first fabric 7 is pressed in the groove by a barrier strip 3, the other part of the first fabric 7 is arranged on two sides outside the groove, the second fabric 8 is arranged on the groove (i.e. on the first fabric), and then the slot 6 of the cover plate is sleeved outside the groove, make the cutting die that pushes up the baldric expose, 8 parts of second surface fabric set up on recess 5 and with set up relative setting from top to bottom in recess 5 first surface fabric 7, and 8 other parts of second surface fabric of apron conflict make this part both sides outside the recess, 8 other parts of second surface fabric contact with the other parts of the first surface fabric 7 of both sides outside the recess, owing to set up the apron, 8 parts of second surface fabric set up on recess 5 and can not get into in recess 5, and the other parts of the second surface fabric 8 that sets up both sides outside the recess also can not remove, the later stage of being convenient for is stablized the processing to the baldric. The cover plate 4 is made of transparent materials, so that the fitting degree of the two shoulder straps can be observed conveniently.

The cover plate 4 is rotatably connected relative to the carrier, namely the cover plate 4 is connected with the carrier through an adhesive tape or other connecting pieces, when the cover plate 4 is required to be contacted with a cutter, the cover plate 4 is rotated until the groove of the cover plate is correspondingly arranged with the groove, when the cover plate 4 is not required, the cover plate 4 is rotated to drop the cutter, and the operation is convenient; or, the cover plate 4 is placed outside the carrier, that is, the cover plate 4 is not connected to the carrier, and when necessary, the groove of the cover plate is placed corresponding to the groove.

The ultrasonic device is also called an ultrasonic welding machine and comprises an ultrasonic processing head, when the ultrasonic processing head is abutted to the cutters, the ultrasonic processing head can cut the second fabric and the first fabric on the two cutters, the first fabric arranged in the groove 5 and the second fabric 8 arranged opposite to the first fabric are attached to form a whole, and the ultrasonic processing head is a welding head.

The principle of the ultrasonic welding machine is as follows: under the action of ultrasonic wave, the welding head vibrates at superhigh frequency to make the joint of two pieces of plastic or fabric produce friction heat and melt instantaneously to form one integral. The ultrasonic welding machine completely replaces the traditional industry of gluing with glue, materials such as connecting bolts, nails, buckles, welding materials or adhesives are not combined together in the ultrasonic welding process, the speed of the ultrasonic welding machine is higher than that of the traditional adhesives or viscose water, the drying time is very fast, the welding process can be easily automated, and the ultrasonic welding machine can be easily customized to adapt to the welding of products with various types and specific specifications.

The present invention also provides a method for using the improved ultrasonic shoulder belt processing device, which comprises the following steps:

s1, placing the first fabric on the groove, enabling the barrier strip to abut against the first fabric to enable the first fabric to be pressed in the groove by the barrier strip, and enabling other parts of the first fabric to be arranged on two sides outside the groove;

s2, placing the second fabric on the groove, in which the first fabric is placed, in the step S1, and then sleeving the cover plate outside the groove (when the cover plate is sleeved outside the groove, the inner side wall of the groove is in contact with the outer side wall of the cutter), so that the second fabric is partially arranged on the groove and is vertically opposite to the first fabric arranged in the groove (at the moment, a space is kept between the two parts), and the other parts of the second fabric are arranged on the two sides outside the groove and are abutted against the other parts of the first fabric arranged on the two sides outside the groove in the step S1;

s3, ultrasonic cutting is carried out on the position (two cutters) of the cutting die where the second fabric is placed in the step S2 by an ultrasonic instrument, when the operation is carried out, only the ultrasonic head is respectively opposite to the cutters, the redundant fabric outside the groove is cut off, the two residual fabrics are attached into a whole (namely, the first fabric and the second fabric on the upper surface of one cutter are adhered, the first fabric and the second fabric on the upper surface of the other cutter are adhered), finally, the barrier strip is taken out (or the finished product is taken out from the barrier strip), the finished product is turned over, shoulder belts with rabbets on two sides are obtained (the rabbets are structurally shown in figure 4, the distance a indicated by an arrow is the width of one rabbets), the rabbets extend along the length direction of the shoulder belts, the uniform rabbets on two sides of the finished product, the rabbets are straight and flat in appearance, the finished product with the rabbets on two sides having the same width is easily obtained, the operation difficulty is greatly reduced, and the requirement on the skill of staff, the production efficiency is improved while the product quality is ensured.

Furthermore, the width L of the seam allowance at one side of the shoulder strap is required_{Stop block}Calculated by the following formula:

L_{stop block}＝H-(T₁+T₂+T₃)

Wherein H is the height of the tool 2, T₁Is the thickness, T, of the first facing 7₂Is the thickness, T, of the second fabric 8₃The thickness of the anti-slip pad is the height of the cutter 2, the height of the cutter 2 is the distance between the upper surface of the cutter 2 and the upper surface of the carrier 1, the anti-slip pad is arranged in a groove of the upper surface of the carrier 1, if the two fabrics are very thin, the thicknesses of the two fabrics can be ignored, for example, when the thicknesses of the two fabrics are not ignored, if the seam allowances on the two sides of a finished product are required to be 0.5cm, the height of the cutter 2 is set to be 1cm, the thickness of the anti-slip pad is set to be 0.5cm, the thickness value of the anti-slip pad is subtracted from the height value of the cutter 2, the width of the seam allowances is the width of the seam allowances, and the seam allowances with the required width can be obtained by adjusting the height H.

The width of the second fabric in the obtained finished product is the distance L between the two cutters₁I.e., the width of the groove, the width of the first fabric is calculated by the following formula:

L₂＝(H-T₃)*2+L₁

wherein H is the height of said one tool 2, T₁Is the thickness, T, of the first facing 7₃Is the thickness of the non-slip mat, L₁The distance between the two knives (i.e. the width of the groove) is negligible when the first fabric is thin.

The improved ultrasonic shoulder strap processing device provided by the invention combines ultrasonic operation and processing components, changes the original roller operation into plane operation, combines the fabric thickness and finished product appearance seam allowance, ensures that the seam allowances on two sides of a finished product are uniform, the seam allowance is straight and smooth, the appearance is flat, the width of the seam allowances on two sides can be equal, and can solve the problems of uneven allowance on two sides, rippling on edges, uneven clothes and the like caused by the fact that the seam allowance cannot be controlled; the operation is simple, the product function and the finished product appearance are ensured, the operation difficulty of staff is greatly reduced while the product quality is ensured, the labor is reduced, the fatigue of the staff is reduced, the primary qualified rate of the product is improved, the workshop operation efficiency is improved, the production efficiency is improved, and the underwear production line is more suitable for the underwear mass production industry; the structure is simple, and the operation reliability is high; the applicability is wide, and the processing component can be used as long as the processing operation is similar to the process operation.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.