阅读说明：本技术 一种纸板箱制作前处理方法 (Pretreatment method for carton manufacturing ) 是由 李佳佳 程业春 于 2019-10-10 设计创作，主要内容包括：本发明涉及一种纸板箱制作前处理方法,主要包括以下步骤,选择纸板、裁剪纸板、纸板处理、纸板压线、纸箱成型和纸箱加固等多道工序,使用到的压线设备包括安装架、压线轮和传动板,安装架内部从上往下依次设置有压线轮和传动板,本发明可以解决现有纸箱在压线过程中存在以下问题：a：现有的纸箱基本上进行压线作业时,皆为人工作业,极易照成纸箱压线歪斜和因力道不均照成压线深度深浅不一的现象,从而导致在纸箱成型时,因为压线歪斜和深度不一导致纸箱报废,极大的增加了生产成本；b：现纸箱在制作过程中,常面临着裁剪纸板时因失误导致纸板尺寸偏大现象,在压痕处理时需将纸板重新进行裁剪,严重浪费人力工时。(The invention relates to a pretreatment method for manufacturing a carton, which mainly comprises the following steps of selecting a paperboard, cutting the paperboard, processing the paperboard, pressing the paperboard, forming the carton, reinforcing the carton and the like, wherein the used pressing equipment comprises a mounting frame, a wire pressing wheel and a transmission plate, the wire pressing wheel and the transmission plate are sequentially arranged in the mounting frame from top to bottom, and the invention can solve the following problems in the wire pressing process of the existing carton: a: the existing cartons are all manually operated when basically performing line pressing operation, and the phenomena that line pressing of the finished cartons is inclined and the depth of the line pressing is different due to uneven force are easily caused, so that the cartons are scrapped due to the inclined and different depths of the line pressing when the cartons are formed, and the production cost is greatly increased; b: present carton is in the manufacture process, often faces the phenomenon that leads to the cardboard size to be bigger than normal because of the error when tailorring the cardboard, need tailor the cardboard again when the indentation is handled, and the manpower man-hour is extravagant seriously.)

1. A pretreatment method for manufacturing a carton is characterized in that: the method mainly comprises the following processing steps:

selecting a paperboard, and selecting a corrugated board with the thickness of 0.5-0.8mm as a paperboard material;

cutting the paper board, and cutting the selected paper board according to the specified size;

step three, paperboard treatment, namely, performing fine treatment on the cut paperboard to remove surface burrs and smoothen the surface of the paperboard;

pressing the paperboard, namely putting the paperboard processed in the step three on a pressing device for pressing the paperboard;

step five, forming a carton, namely folding the paperboard processed in the step four along the pressing line to form a cuboid;

step six, reinforcing the carton, adhering the combined part of the paperboard treated in the step five by using strong double-sided adhesive tape or fixing nails, and sealing the outer side of the paperboard by using transparent adhesive tape;

the wire pressing equipment used in the steps comprises an installation frame (1), a wire pressing wheel (2) and a transmission plate (3), wherein the wire pressing wheel (2) and the transmission plate (3) are sequentially arranged in the installation frame (1) from top to bottom;

the creasing wheel (2) comprises a motor A, a rotating sleeve (21), a cutting blade (22), creasing pressing strips (23) and a rotating shaft cover plate (24), wherein the motor A is installed on the outer wall of the installation frame (1) through a motor base, the rotating sleeve (21) is arranged on an output shaft of the motor A, T-shaped chutes and paddle-shaped holes are uniformly formed in the outer surface of the rotating sleeve (21), the cutting blade (22) matched with the T-shaped chutes is arranged on the outer surface of the rotating sleeve (21) in a sliding connection mode, the creasing pressing strips (23) are fixed at the left end and the right end of the cutting blade (22) along the outer surface of the rotating sleeve (21) through bolts, the creasing pressing strips (23) are of a sawtooth structure, the rotating shaft cover plate (24) is arranged at the left end of the rotating sleeve (21) in a sliding connection mode, and the;

the indentation pressing strip (23) comprises an indentation sleeve (231), indentation teeth (232), a jacking mechanism (233), a blade fixing sleeve (234) and a clamping sleeve piece (235), the indentation sleeve (231) is fixed on the outer surface of the rotating sleeve (21) through a bolt, the indentation teeth (232) are arranged at the upper end of the indentation sleeve (231) in a spring connection mode, the indentation sleeve (231) is of a shell structure, the jacking mechanism (233) is arranged inside the indentation sleeve (231), the blade fixing sleeve (234) is symmetrically arranged at the left end and the right end of the indentation sleeve (231) in a welding fixing mode, and the clamping sleeve piece (235) is arranged inside the blade fixing sleeve (234);

the transmission plate (3) comprises a supporting seat (31), sliding baffles (32) and a transmission sleeve piece (33), the supporting seat (31) is fixed on the mounting frame (1) in a welding mode, the sliding baffles (32) are symmetrically arranged at two ends of the supporting seat (31), strip-shaped sliding grooves are formed in the sliding baffles (32), and the transmission sleeve piece (33) is arranged on the sliding baffles (32);

the transmission external member (33) comprises a motor B, a driving gear (331), a transmission rack (332) and a fixing mechanism (333), the motor B is mounted on the outer wall of the mounting frame (1) through a motor base, the driving gear (331) is fixedly mounted on an output shaft of the motor B, the transmission rack (332) which is mutually matched and acts is arranged at the lower end of the driving gear (331), the fixing mechanism (333) is arranged at the left end of the transmission rack (332), and the fixing mechanism (333) is mounted on the sliding baffle (32) in a sliding connection mode;

the fixing mechanism (333) comprises a fixing frame (3331), a pressing mechanism (3332) and a transverse fixing clamp (3333), the fixing frame (3331) is installed on the sliding baffle (32) in a sliding connection mode, the fixing frame (3331) is of an Contraband-shaped structure, the pressing mechanism (3332) is arranged at the upper end of the fixing frame (3331), and the transverse fixing clamp (3333) is arranged at the lower end of the fixing frame (3331) in a sliding connection mode.

2. A carton preparation method according to claim 1, wherein: the jacking mechanism (233) comprises an air storage bag A (2331), an extrusion rod (2332) and a jacking rod A (2333), the air storage bag A (2331) is located inside the indentation sleeve (231), the extrusion rod (2332) matched with the paddle-shaped hole is arranged at the upper end inside the air storage bag A (2331), the jacking rod A (2333) is arranged at the lower end inside the air storage bag A (2331), and the head of the jacking rod A (2333) is fixed on the indentation teeth (232).

3. A carton preparation method according to claim 1, wherein: buckle external member (235) are including contact rod (2351), gas storage bag B (2352), T type ejector pin (2353), liftout pole B (2354) and buckle clamp (2355), contact rod (2351) are installed inside fixed cover of blade (234) through sliding connection's mode, contact rod (2351) right-hand member is provided with gas storage bag B (2352), gas storage bag B (2355) are "T" style of calligraphy structure, the inside left end of gas storage bag B (2352) is provided with T type ejector pin (2353) that link to each other with contact rod (2351), the inside right-hand member of gas storage bag B is provided with liftout pole B (2354), liftout pole right-hand member is provided with buckle clamp (2355), inside fixed cover of blade (234) is fixed through sliding connection's mode to buckle clamp (2355), be provided with saw type tooth on buckle clamp (2355).

4. A carton preparation method according to claim 1, wherein: the pressing mechanism (3332) comprises a hydraulic cylinder, a punch fixing plate (3332a) and a pressing clamp (3332b), the hydraulic cylinder is fixedly mounted on the fixing frame (3331), the punch fixing plate (3332a) is arranged on an output shaft of the hydraulic cylinder, and the pressing clamp (3332b) is arranged on the punch fixing plate (3332 a).

5. A carton preparation method according to claim 1, wherein: the cutting blade (22) and the indentation pressing strip (23) are of detachable structures.

6. A carton preparation method according to claim 1, wherein: foam is arranged on the surface of the transverse fixing clamp (3333).

7. A carton preparation method according to claim 1, wherein: a rolling ball which can move freely is arranged in the paddle type hole.

8. A carton preparation method according to claim 3, wherein: the head of the contact rod (2351) is provided with a ball.

Technical Field

The invention relates to the technical field of paperboard processing, in particular to a pretreatment method for manufacturing a paperboard box.

Background

The cardboard box is the most widely used packaging product, and has various specifications and models according to different materials, such as corrugated cardboard boxes, single-layer cardboard boxes and the like, and the cardboard box is an indispensable part of modern logistics and plays an important role in containing, protecting products and beautifying, wherein before the cardboard box is manufactured, a plurality of processes such as cardboard selection, cardboard cutting, cardboard treatment, cardboard pressing lines, cardboard forming, cardboard reinforcement and the like are required, and the cardboard pressing lines directly influence the quality of the cardboard box.

However, the existing carton has the following problems in the line pressing process: a: the existing cartons are all manually operated when basically performing line pressing operation, and the phenomena that line pressing of the finished cartons is inclined and the depth of the line pressing is different due to uneven force are easily caused, so that the cartons are scrapped due to the inclined and different depths of the line pressing when the cartons are formed, and the production cost is greatly increased; b: present carton is in the manufacture process, often faces the phenomenon that leads to the cardboard size to be bigger than normal because of the error when tailorring the cardboard, need tailor the cardboard again when the indentation is handled, and the manpower man-hour is extravagant seriously.

Disclosure of Invention

In order to solve the problems, the invention provides a method for processing a carton before manufacturing, which can solve the problems of the carton in the line pressing process.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose: a pretreatment method for manufacturing a carton mainly comprises the following planting steps:

selecting a paperboard, and selecting a corrugated board with the thickness of 0.5-0.8mm as a paperboard material;

cutting the paper board, and cutting the selected paper board according to the specified size;

step three, paperboard treatment, namely, performing fine treatment on the cut paperboard to remove surface burrs and smoothen the surface of the paperboard;

pressing the paperboard, namely putting the paperboard processed in the step three on a pressing device for pressing the paperboard;

step five, forming a carton, namely folding the paperboard processed in the step four along the pressing line to form a cuboid;

and step six, reinforcing the carton, adhering the combined part of the paperboard treated in the step five by using strong double-sided adhesive tape or fixing nails, and sealing the outer side of the paperboard by using transparent adhesive tape.

The wire pressing equipment used in the steps comprises a mounting frame, a wire pressing wheel and a transmission plate, wherein the wire pressing wheel and the transmission plate are sequentially arranged in the mounting frame from top to bottom.

The fabric pressing wheel comprises a motor A, a rotating sleeve, a cutting blade, an indentation pressing strip and a rotating shaft cover plate, the motor A is installed on the outer wall of the mounting frame through a motor base, the rotating sleeve is arranged on an output shaft of the motor A, a T-shaped sliding groove and a paddle-shaped hole are evenly formed in the outer surface of the rotating sleeve, the cutting blade which is matched with the T-shaped sliding groove is arranged on the outer surface of the rotating sleeve in a sliding connection mode, the indentation pressing strip is fixed on the outer surface of the rotating sleeve along the left end and the right end of the cutting blade through bolts, the indentation pressing strip is of a sawtooth structure, the rotating shaft cover plate is arranged at the left end of the.

The indentation layering includes indentation cover, indentation tooth, climbing mechanism, the fixed cover of blade and buckle external member, and the indentation cover passes through the bolt fastening on rotatory telescopic surface, and indentation cover upper end is provided with the indentation tooth through spring coupling's mode, and the indentation cover is shell structure, and the inside climbing mechanism that is provided with of indentation cover, both ends are provided with the fixed cover of blade through welded fastening's mode symmetry about the indentation cover, and the fixed inside buckle external member that is provided with of blade cover.

The transmission plate comprises a supporting seat, a sliding baffle and a transmission external member, the supporting seat is fixed on the mounting frame in a welding mode, the sliding baffle is symmetrically arranged at two ends of the supporting seat, a strip-shaped sliding groove is formed in the sliding baffle, and the transmission external member is arranged on the sliding baffle.

The transmission external member includes motor B, drive gear, transmission rack and fixed establishment, and motor B passes through the motor cabinet to be installed on the mounting bracket outer wall, and fixed mounting has drive gear on the motor B output shaft, and the drive gear lower extreme is provided with the transmission rack of mutually supporting effect, and the transmission rack left end is provided with fixed establishment, and fixed establishment installs on slide damper through sliding connection's mode.

The fixing mechanism comprises a fixing frame, a pressing mechanism and a transverse fixing clamp, the fixing frame is installed on the sliding baffle in a sliding connection mode, the fixing frame is of a structure shaped like the Chinese character 'Contraband', the pressing mechanism is arranged at the upper end of the fixing frame, and the transverse fixing clamp is arranged at the lower end of the fixing frame in a sliding connection mode.

The jacking mechanism comprises an air storage bag A, an extrusion rod and an ejector rod A, the air storage bag A is located inside the indentation sleeve, the extrusion rod matched with the paddle-shaped hole is arranged at the upper end inside the air storage bag A, the ejector rod A is arranged at the lower end inside the air storage bag A, and the head of the ejector rod A is fixed on the indentation teeth.

The buckle external member includes the contact lever, gas storage bag B, T type ejector pin, ejector pin B and buckle clamp, the contact lever passes through sliding connection's mode and installs inside the fixed cover of blade, the contact lever right-hand member is provided with gas storage bag B, gas storage bag B is "T" style of calligraphy structure, the inside left end of gas storage bag B is provided with the T type ejector pin that links to each other with the contact lever, the inside right-hand member of gas storage bag B is provided with ejector pin B, ejector pin right-hand member is provided with the buckle clamp, the buckle clamp is fixed inside the fixed cover of blade through sliding connection's mode, the buckle clamp is last to be provided with saw type tooth.

The pressing mechanism comprises a hydraulic cylinder, a punch fixing plate and a pressing clamp, the hydraulic cylinder is fixedly mounted on the fixing frame, the punch fixing plate is arranged on an output shaft of the hydraulic cylinder, and the pressing clamp is arranged on the punch fixing plate.

The cutting blade and the indentation pressing strip are of detachable and adjustable structures.

Foam is arranged on the surface of the transverse fixing clamp.

A rolling ball which can move freely is arranged in the paddle type hole.

The head of the contact rod is provided with a ball.

The invention has the beneficial effects that:

1. the invention can solve the following problems in the existing paperboard line pressing process, a: the existing cartons are all manually operated when basically performing line pressing operation, and the phenomena that line pressing of the finished cartons is inclined and the depth of the line pressing is different due to uneven force are easily caused, so that the cartons are scrapped due to the inclined and different depths of the line pressing when the cartons are formed, and the production cost is greatly increased; b: present carton is in the manufacture process, often faces the phenomenon that leads to the cardboard size to be bigger than normal because of the error when tailorring the cardboard, need tailor the cardboard again when the indentation is handled, and the manpower man-hour is extravagant seriously.

2. The creasing wheel is designed, the motor A drives the rotary sleeve and the creasing pressing strip to synchronously rotate, the rolling ball in the paddle-shaped hole on the surface of the rotary sleeve moves downwards under the action of gravity and centrifugal force so as to drive the creasing pressing strip to work, the creasing pressing strip is in a straight shape, and the force consistency is ensured due to the rolling ball movement, so that the phenomena of crooked creasing and different creasing depths are avoided, and the production cost is greatly reduced.

3. According to the invention, the cutting blade is designed, and the position of the cutting blade is manually adjusted, so that when the size of the paperboard exceeds the designed size, the cutting blade is driven by the motor A to synchronously move, so that the excessive part is cut, the reworking time is reduced, and the working efficiency is greatly improved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a flow chart of the operation of the present invention;

FIG. 2 is a schematic structural diagram of the wire pressing device of the present invention;

FIG. 3 is a schematic structural view of the creasing wheel of the present invention;

FIG. 4 is a schematic view of the construction of the indentation bar of the present invention;

FIG. 5 is a schematic view of the construction of the drive plate of the present invention;

FIG. 6 is a schematic structural view of the transmission assembly of the present invention;

FIG. 7 is a schematic structural view of the snap kit of the present invention;

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

As shown in fig. 1 to 7, a method for processing a carton before making the carton mainly comprises the following planting steps:

selecting a paperboard, and selecting a corrugated board with the thickness of 0.5-0.8mm as a paperboard material;

cutting the paper board, and cutting the selected paper board according to the specified size;

step three, paperboard treatment, namely, performing fine treatment on the cut paperboard to remove surface burrs and smoothen the surface of the paperboard;

pressing the paperboard, namely putting the paperboard processed in the step three on a pressing device for pressing the paperboard;

step five, forming a carton, namely folding the paperboard processed in the step four along the pressing line to form a cuboid;

and step six, reinforcing the carton, adhering the combined part of the paperboard treated in the step five by using strong double-sided adhesive tape or fixing nails, and sealing the outer side of the paperboard by using transparent adhesive tape.

The wire pressing equipment used in the steps comprises a mounting frame 1, a wire pressing wheel 2 and a transmission plate 3, wherein the wire pressing wheel 2 and the transmission plate 3 are sequentially arranged in the mounting frame 1 from top to bottom.

The creasing wheel 2 comprises a motor A, a rotating sleeve 21, a cutting blade 22, a creasing pressing strip 23 and a rotating shaft cover plate 24, the motor A is arranged on the outer wall of the mounting rack 1 through a motor base, the rotating sleeve 21 is arranged on an output shaft of the motor A, a T-shaped chute and a paddle-shaped hole are uniformly arranged on the outer surface of the rotating sleeve 21, the cutting blade 22 matched with the T-shaped chute is arranged on the outer surface of the rotating sleeve 21 in a sliding connection mode, the creasing pressing strip 23 is fixed at the left end and the right end of the cutting blade 22 along the outer surface of the rotating sleeve 21 through bolts, the creasing pressing strip 23 is of a sawtooth structure, the rotating shaft cover plate 24 is arranged at the left end of the rotating sleeve 21 in a sliding connection mode, the rotating shaft cover, the motor A starts to work to drive the rotary sleeve 21 to rotate, and the rotary sleeve 21 drives the cutting blade 22 and the indentation pressing strip 23 to synchronously rotate.

A rolling ball which can move freely is arranged in the paddle type hole.

Indentation layering 23 includes indentation cover 231, indentation tooth 232, climbing mechanism 233, the fixed cover 234 of blade and buckle external member 235, and indentation cover 231 passes through the bolt fastening on rotary sleeve 21's surface, and indentation cover 231 upper end is provided with indentation tooth 232 through spring coupling's mode, and indentation cover 231 is shell structure, and indentation cover 231 is inside to be provided with climbing mechanism 233, and both ends are provided with the fixed cover 234 of blade through welded fastening's mode symmetry about indentation cover 231, and the fixed cover 234 of blade is inside to be provided with buckle external member 235.

The jacking mechanism 233 comprises an air storage bag A2331, an extrusion rod 2332 and a jacking rod A2333, the air storage bag A2331 is located inside the indentation sleeve 231, the upper end inside the air storage bag A2331 is provided with the extrusion rod 2332 matched with the paddle-shaped hole, the lower end inside the air storage bag A2331 is provided with the jacking rod A2333, the head of the jacking rod A2333 is fixed on the indentation teeth 232, during specific work, the motor A drives the rotary sleeve 21 to rotate, under the action of gravity and centrifugal force, the rolling ball inside the paddle-shaped hole moves downwards to push the extrusion rod 2332 to move downwards to squeeze air inside the air storage bag A2331, and meanwhile, the jacking rod A2333 is pushed to move downwards to achieve the purpose of jacking the indentation teeth 232.

The buckle external member 235 comprises a contact rod 2351, an air storage bag B2352, a T-shaped ejector rod 2353, an ejector rod B2354 and a buckle clamp 2355, wherein the contact rod 2351 is installed inside the blade fixing sleeve 234 in a sliding connection mode, the air storage bag B2352 is arranged at the right end of the contact rod 2351, the air storage bag B2355 is of a T-shaped structure, the T-shaped ejector rod 2353 connected with the contact rod 2351 is arranged at the left end inside the air storage bag B2352, the ejector rod B2354 is arranged at the right end inside the air storage bag B, the buckle clamp 2355 is arranged at the right end of the ejector rod, the buckle clamp 2355 is fixed inside the blade fixing sleeve 234 in a sliding connection mode, saw-shaped teeth are arranged on the buckle 2355, and during specific work, when the screw is locked, the contact rod 2351 is pushed to move rightwards, the contact rod 2351 pushes the T-shaped ejector rod 2353 to move rightwards, air in the air storage bag B2352 is extruded, the ejector rod B2354 is pushed to move rightwards, thereby urging the snap clip 2355 to move to the right, which in turn serves the purpose of securing the cutting blade 22.

The cutting blade 22 and the indentation pressing strip 23 are both detachable and adjustable structures.

The contact rod 2351 is provided with a ball at its head.

The driving plate 3 comprises a supporting seat 31, a sliding baffle 32 and a driving sleeve member 33, the supporting seat 31 is fixed on the mounting frame 1 in a welding mode, the sliding baffle 32 is symmetrically arranged at two ends of the supporting seat 31, a strip-shaped chute is arranged on the sliding baffle 32, and the driving sleeve member 33 is arranged on the sliding baffle 32.

The transmission external member 33 includes motor B, drive gear 331, transmission rack 332 and fixed establishment 333, motor B passes through the motor cabinet to be installed on the outer wall of mounting bracket 1, fixed mounting has drive gear 331 on the motor B output shaft, drive gear 331 lower extreme is provided with the transmission rack 332 of mutually supporting effect, transmission rack 332 left end is provided with fixed establishment 333, fixed establishment 333 installs on slide damper 32 through sliding connection's mode, concrete during operation, motor B begins work, it carries out synchronous motion to drive gear 331, drive gear 331 drives transmission rack 332 and carries out reciprocating motion, transmission rack 332 drives fixed establishment 333 and carries out synchronous motion, thereby reach the mesh of pulling the transportation.

The fixing mechanism 333 comprises a fixing frame 3331, a pressing mechanism 3332 and a transverse fixing clamp 3333, the fixing frame 3331 is mounted on the sliding baffle 32 in a sliding connection mode, the fixing frame 3331 is in an Contraband-shaped structure, the pressing mechanism 3332 is arranged at the upper end of the fixing frame 3331, and the transverse fixing clamp 3333 is arranged at the lower end of the fixing frame 3331 in a sliding connection mode.

The hold-down mechanism 3332 includes the pneumatic cylinder, drift fixed plate 3332a and hold-down clamp 3332b, pneumatic cylinder fixed mounting is on mount 3331, be provided with drift fixed plate 3332a on the pneumatic cylinder output shaft, be provided with on the drift fixed plate 3332a and hold-down clamp 3332b, during specific work, through the mode of manual regulation, adjust horizontal fixation clamp 3333 to suitable position, back pneumatic cylinder begins work, drive drift fixed plate 3332a and hold-down clamp 3332b downstream, reach the purpose of fixed cardboard in view of the above.

Foam is arranged on the surface of the transverse fixing clamp 3333.

When in work:

s1, adjusting positions of a blade and an indentation: the cutting blade 22 and the indentation bead 23 are adjusted to the working position by means of manual adjustment.

S2, fixing a paperboard: the transverse fixing clamp 3333 is adjusted to a proper width through manual adjustment, the paper board is placed on the transverse fixing clamp 3333, and meanwhile, the hydraulic cylinder starts to work to drive the punch fixing plate 3332a and the pressing clamp 3332b to move downwards, so that the purpose of fixing the paper board is achieved.

S3, pulling a paperboard: after the paper board is fixed, the motor B starts to work to drive the driving gear 331 to perform synchronous motion, the driving gear 331 drives the transmission rack 332 to perform reciprocating motion, and the transmission rack 332 drives the fixing mechanism 333 to perform synchronous motion, so that the purpose of drawing the paper board is achieved.

S4, paperboard indentation treatment: when the paperboard is pulled, the motor A starts to work to drive the rotary sleeve 21 to rotate, the rotary sleeve 21 drives the cutting blade 22 and the indentation pressing strip 23 to synchronously rotate, the rolling ball in the upper paddle type hole of the rotary sleeve 21 moves downwards due to the action of gravity and centrifugal force to push the extrusion rod 2332 to move downwards to extrude the air in the air storage bag A2331, and meanwhile, the ejection rod A2333 is pushed to move downwards to eject the indentation teeth 232, so that the purpose of paperboard indentation treatment is achieved.

S5, repeating the steps S1 to S4, and continuously making paperboard impressions.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.