阅读说明：本技术 一种锂电池表面用的生产日期喷码装置 (Production date that lithium cell surface was used spouts a yard device ) 是由 李华平 于 2021-07-29 设计创作，主要内容包括：本发明涉及一种生产日期喷码装置,尤其涉及一种锂电池表面用的生产日期喷码装置。提供一种可以固定锂电池,工作效率高的锂电池表面用的生产日期喷码装置。本发明提供了这样一种锂电池表面用的生产日期喷码装置,包括有：底座,底座用于安装整个装置；第一导向杆,底座顶部的一侧对称设有第一导向杆；第一连接板,第一导向杆之间滑动式设有第一连接板；第一弹簧,第一连接板与底座之间设有两个第一弹簧,第一弹簧均套在第一导向杆上。采用下压机构和拨动机构之间的配合,下压机构不断向下压动第一连接板,从而使锂电池不断进行喷码工作,当第一连接板向下移动时,带动拨动机构将喷码完毕的锂电池向左推出,从而提高了工作效率。(The invention relates to a production date code spraying device, in particular to a production date code spraying device for the surface of a lithium battery. The production date code spraying device for the surface of the lithium battery can fix the lithium battery and is high in working efficiency. The invention provides a production date code spraying device for the surface of a lithium battery, which comprises: the base is used for mounting the whole device; the first guide rods are symmetrically arranged on one side of the top of the base; the first connecting plate is arranged between the first guide rods in a sliding manner; two first springs are arranged between the first connecting plate and the base, and the first springs are all sleeved on the first guide rod. Adopt the cooperation between pushing down the mechanism and the toggle mechanism, pushing down the mechanism and constantly pushing down and moving first connecting plate to make the lithium cell constantly carry out yard work, when first connecting plate moves down, drive the toggle mechanism and release left the lithium cell that the yard was accomplished, thereby improved work efficiency.)

1. The utility model provides a date of production that lithium cell surface was used spouts a yard device which characterized in that, including:

the base (1), the base (1) is used for installing the whole device;

the first guide rods (3) are symmetrically arranged on one side of the top of the base (1);

the first connecting plate (2) is arranged between the first guide rods (3) in a sliding manner;

two first springs (4) are arranged between the first connecting plate (2) and the base (1),

the first springs (4) are sleeved on the first guide rods (3);

the meshing block (6) is arranged on one side of the bottom of the first connecting plate (2);

the meshing block (6) is provided with a paint spraying block (5);

the blanking mechanism (7) is arranged on one side of the top of the base (1);

the lower part of the receiving mechanism (8) and the blanking mechanism (7) is provided with the receiving mechanism (8).

2. The device for spraying the code on the production date for the surface of the lithium battery as claimed in claim 1,

unloading mechanism (7) including:

the middle of the top of the base (1) is provided with a support frame (70);

the servo motor (71) is arranged on the support frame (70);

the output end of the servo motor (71) is provided with a first rotating shaft (72);

a support rod (73), wherein the support rod (73) is arranged on one side of the top of the base (1);

the storage basket (74) is arranged between the support rod (73) and the support frame (70);

the lower part of the storage basket (74) is provided with a limiting ring (75);

a material distributing turntable (76) is arranged on the first rotating shaft (72).

3. The device for spraying the code on the production date for the surface of the lithium battery as claimed in claim 2,

receiving mechanism (8) including:

a first supporting plate (80), wherein one side of the top of the base (1) is provided with the first supporting plate (80);

the top of the first supporting plate (80) is provided with a material receiving groove (81);

the lower part of the material receiving groove (81) is provided with the placing platform (82).

4. The device for spraying the code on the production date for the surface of the lithium battery as claimed in claim 3,

still including pushing down mechanism (9), pushing down mechanism (9) including:

a second supporting plate (90), wherein the second supporting plate (90) is arranged on one side of the top of the base (1);

the top of the second supporting plate (90) is rotatably provided with a second rotating shaft (91);

the cam (92) is arranged on the second rotating shaft (91);

a first belt pulley assembly (93), wherein a first belt pulley assembly (93) is arranged between the first rotating shaft (72) and the second rotating shaft (91).

5. The device for spraying the code on the production date for the surface of the lithium battery as claimed in claim 4,

still including toggle mechanism (10), toggle mechanism (10) including:

the wedge-shaped plate (100) is arranged on one side of the first connecting plate (2);

the first connecting rod (101) is rotatably arranged on one side of the top of the base (1);

a torsion spring (102), wherein the torsion spring (102) is arranged between the first connecting rod (101) and the base (1);

the rotating rod (103) is arranged on the first connecting rod (101), and the rotating rod (103) is matched with the wedge-shaped plate (100);

the first connecting rod (101) is provided with a first connecting plate (104);

the second connecting rod (105) is arranged on the second connecting plate (104);

a push rod (106), wherein the second connecting rod (105) is rotatably provided with the push rod (106);

the device comprises a guide sleeve (107), wherein the guide sleeve (107) is arranged on one side of a placing platform (82), and a push rod (106) is connected with the guide sleeve (107) in a sliding manner;

and a second spring (108) is arranged between the push rod (106) and the guide sleeve (107), and the second spring (108) is sleeved on the push rod (106).

6. The device for spraying the code on the production date for the surface of the lithium battery as claimed in claim 5,

still including placing mechanism (11), place mechanism (11) including:

a placing basket (110), wherein the placing basket (110) is arranged on one side of the top of the base (1);

the top of the placing basket (110) is provided with two limiting blocks (111);

two second guide rods (112) are arranged on one side of the placing basket (110) in a sliding mode;

a third connecting plate (114) is arranged between the tops of the second guide rods (112);

and two third springs (113) are arranged between the third connecting plate (114) and the placing basket (110), and the third springs (113) are sleeved on the second guide rod (112).

7. The device for spraying the code on the production date for the surface of the lithium battery as claimed in claim 6, further comprising a material pushing mechanism (12), wherein the material pushing mechanism (12) comprises:

the third supporting plate (120) is arranged on one side of the top of the base (1), and the third supporting plate (120) is rotatably connected with the second rotating shaft (91);

a third rotating shaft (121), wherein the lower part of the third supporting plate (120) is rotatably provided with the third rotating shaft (121);

a second belt pulley component (122), wherein a second belt pulley component (122) is arranged between the second rotating shaft (91) and the third rotating shaft (121);

the sliding rail frame (123) is arranged on one side of the top of the base (1);

the special-shaped wheel (124) is arranged on the third rotating shaft (121), the special-shaped wheel (124) is provided with a sliding groove, and the special-shaped wheel (124) is rotatably connected with the sliding rail frame (123);

the push plate (127) is arranged on the slide rail frame (123) in a sliding manner;

the third connecting rod (125) is arranged on the push plate (127), and the third connecting rod (125) is matched with the special-shaped wheel (124);

and a fourth spring (126) is arranged between the push rod (106) and the slide rail frame (123).

8. The production date code spraying device for the surface of the lithium battery as claimed in claim 7, wherein: the fourth spring (126) is a compression spring.

Technical Field

The invention relates to a production date code spraying device, in particular to a production date code spraying device for the surface of a lithium battery.

Background

The lithium ion battery is used as a novel green energy source, and the application field is more and more extensive. In recent years, the demand of cylindrical lithium ion secondary batteries has been increasing, and the cylindrical lithium ion secondary batteries are widely applied to the fields of notebook computers, digital cameras, video cameras, electric bicycles, electric vehicles and military and national defense. The final procedure in the production process of the cylindrical lithium battery is packaging and shipment, and in the procedure, the lithium battery needs to be subjected to thermal shrinkage and code spraying. Among the prior art, there is the lithium cell conventionality and spouts a yard process, and the cylinder lithium cell that waits to spout the sign indicating number in process of production can the horizontal hunting, and the easy deformation of spun sign indicating number is crooked, and is very big to the outward appearance influence, and the yield is low, and work efficiency is low, and the rework ratio is more.

Therefore, a production date code spraying device for the surface of the lithium battery, which can fix the lithium battery and has high working efficiency, needs to be designed.

Disclosure of Invention

In order to overcome the defects that the lithium battery can swing left and right and the working efficiency is low in the production process, the technical problem to be solved is as follows: the production date code spraying device for the surface of the lithium battery can fix the lithium battery and is high in working efficiency.

The technical implementation scheme of the invention is as follows: a production date spouts a yard device for lithium cell surface, including:

the base is used for mounting the whole device;

the first guide rods are symmetrically arranged on one side of the top of the base;

the first connecting plate is arranged between the first guide rods in a sliding manner;

two first springs are arranged between the first connecting plate and the base, and the first springs are sleeved on the first guide rod;

the meshing block is arranged on one side of the bottom of the first connecting plate;

the meshing block is provided with a paint spraying block;

the blanking mechanism is arranged on one side of the top of the base;

the lower part of the material receiving mechanism is provided with a material receiving mechanism.

In a preferred embodiment of the present invention, the blanking mechanism comprises:

the middle of the top of the base is provided with a support frame;

the servo motor is arranged on the supporting frame;

the output end of the servo motor is provided with a first rotating shaft;

the supporting rod is arranged on one side of the top of the base;

the storage basket is arranged between the supporting rod and the supporting frame;

the lower part of the material storage basket is provided with a limiting ring;

the first rotating shaft is provided with a material distributing rotating disc.

In a preferred embodiment of the present invention, the receiving mechanism comprises:

the first supporting plate is arranged on one side of the top of the base;

the top of the first supporting plate is provided with a material receiving groove;

the lower part of the material receiving groove is provided with the placing platform.

In a preferred embodiment of the present invention, the present invention further comprises a pressing mechanism, wherein the pressing mechanism comprises:

the second supporting plate is arranged on one side of the top of the base;

the top of the second supporting plate is rotatably provided with a second rotating shaft;

the cam is arranged on the second rotating shaft;

and a first belt pulley assembly is arranged between the first rotating shaft and the second rotating shaft.

In a preferred embodiment of the present invention, the present invention further comprises a toggle mechanism, wherein the toggle mechanism comprises:

the wedge-shaped plate is arranged on one side of the first connecting plate;

the first connecting rod is rotatably arranged on one side of the top of the base;

a torsion spring is arranged between the first connecting rod and the base;

the first connecting rod is provided with a rotating rod which is matched with the wedge-shaped plate;

the first connecting rod is provided with a first connecting plate;

the second connecting rod is arranged on the second connecting plate;

the second connecting rod is rotatably provided with a push rod;

one side of the placing platform is provided with a guide sleeve, and the push rod is connected with the guide sleeve in a sliding manner;

and a second spring is arranged between the push rod and the guide sleeve and sleeved on the push rod.

In a preferred embodiment of the present invention, the present invention further comprises a placing mechanism, the placing mechanism comprises:

a placing basket is arranged on one side of the top of the base;

the top of the placing basket is provided with two limiting blocks;

two second guide rods are arranged on one side of the placing basket in a sliding mode;

a third connecting plate is arranged between the tops of the second guide rods;

and two third springs are arranged between the third connecting plate and the placing basket, and the third springs are all sleeved on the second guide rod.

In a preferred embodiment of the present invention, the present invention further comprises a pushing mechanism, wherein the pushing mechanism comprises:

a third supporting plate is arranged on one side of the top of the base and is rotatably connected with the second rotating shaft;

the lower part of the third supporting plate is rotatably provided with a third rotating shaft;

a second belt pulley component is arranged between the second rotating shaft and the third rotating shaft;

the slide rail frame is arranged on one side of the top of the base;

the third rotating shaft is provided with a special-shaped wheel which is provided with a sliding chute and is rotatably connected with the sliding rail frame;

the push plate is arranged on the slide rail frame in a sliding manner;

the third connecting rod is arranged on the push plate and matched with the special-shaped wheel;

and a fourth spring is arranged between the push rod and the slide rail frame.

In a preferred embodiment of the invention, the fourth spring is a compression spring.

Compared with the prior art, the invention has the following advantages: 1. adopt the cooperation between pushing down the mechanism and the toggle mechanism, pushing down the mechanism and constantly pushing down and moving first connecting plate to make the lithium cell constantly spout a yard work, when first connecting plate moves down, drive the toggle mechanism and release left the lithium cell that the sign indicating number was accomplished, thereby realized automatic discharging, improved work efficiency.

2. Adopt the cooperation between placement machine and the pushing equipment, the staff will accomodate the basket and place in placement machine, and when toggle mechanism promoted the lithium cell, pushing equipment promoted to accomodate the basket left, made the lithium cell drop to accomodating in the basket, when toggle mechanism reset, under placement machine's cooperation, the basket was accomodate in the drive and is slided and reset right, and pushing equipment resets simultaneously to realize receiving the material automatically one by one.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic perspective view of a first part of the present invention.

Fig. 3 is a schematic perspective view of a second part of the present invention.

Fig. 4 is a perspective view of a third part of the present invention.

Fig. 5 is a perspective view of a fourth part of the present invention.

Fig. 6 is a schematic perspective view of a fifth part of the present invention.

Fig. 7 is a perspective view of a sixth part of the present invention.

Fig. 8 is a schematic perspective view of a seventh part of the present invention.

Fig. 9 is a schematic perspective view of an eighth part of the present invention.

Labeled as: 1-a base, 2-a first connecting plate, 3-a first guide bar, 4-a first spring, 5-a paint spray block, 6-a meshing block, 7-a blanking mechanism, 70-a support frame, 71-a servo motor, 72-a first rotating shaft, 73-a support bar, 74-a storage basket, 75-a limiting ring, 76-a material distribution rotating disc, 8-a material receiving mechanism, 80-a first support plate, 81-a material receiving groove, 82-a placing platform, 9-a pressing mechanism, 90-a second support plate, 91-a second rotating shaft, 92-a cam, 93-a first belt pulley assembly, 10-a shifting mechanism, 100-a wedge-shaped plate, 101-a first connecting rod, 102-a torsion spring, 103-a rotating bar, 104-a second connecting plate, 105-a second connecting rod, 106-push rod, 107-guide sleeve, 108-second spring, 11-placing mechanism, 110-placing basket, 111-limiting block, 112-second guide rod, 113-third spring, 114-third connecting plate, 12-pushing mechanism, 120-third supporting plate, 121-third rotating shaft, 122-second belt pulley component, 123-sliding rail frame, 124-special-shaped wheel, 125-third connecting rod, 126-fourth spring and 127-push plate.

Detailed Description

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.

Example 1

The utility model provides a date of production that lithium cell surface was used spouts a yard device, as shown in fig. 1-2, including base 1, first connecting plate 2, first guide bar 3, first spring 4, the piece 5 that sprays paint, meshing piece 6, unloading mechanism 7 and receiving mechanism 8, base 1 top front side symmetry is equipped with first guide bar 3, slidingtype is equipped with first connecting plate 2 between the first guide bar 3, be equipped with two first springs 4 between first connecting plate 2 and the base 1, first spring 4 all overlaps on first guide bar 3, 2 bottom left sides of first connecting plate are equipped with meshing piece 6, be equipped with on the meshing piece 6 and spout the lacquer piece 5, base 1 top rear side is equipped with unloading mechanism 7, 7 lower parts of unloading mechanism are equipped with receiving mechanism 8.

The staff places the lithium cell in unloading mechanism 7, then start unloading mechanism 7 work, unloading mechanism 7 is with the unloading of lithium cell one by one, the lithium cell rolls to receiving mechanism 8 from unloading mechanism 7 on, when the lithium cell rolls to the assigned position, the staff pushes down and moves first connecting plate 2, first spring 4 is all compressed, first connecting plate 2 drives and spouts lacquer piece 5 and meshing piece 6 equal downstream, meshing piece 6 presss from both sides tightly the lithium cell, the piece 5 that sprays paint spouts the sign indicating number to the lithium cell surface, spout the sign indicating number and finish the back, loosen first connecting plate 2, under first spring 4's reset action, drive first connecting plate 2 and all parts on it all upwards move and reset, then the staff takes out the lithium cell that the sign indicating number was finished spraying the sign indicating number, after the sign indicating number was finished to whole lithium cell unloading, close unloading mechanism 7 can.

Example 2

On the basis of embodiment 1, as shown in fig. 3-4, the blanking mechanism 7 includes a support frame 70, a servo motor 71, a first rotating shaft 72, a support rod 73, a storage basket 74, a limit ring 75, and a material-dividing turntable 76, the support frame 70 is disposed in the middle of the top of the base 1, the servo motor 71 is disposed on the support frame 70, the first rotating shaft 72 is disposed at the output end of the servo motor 71, the support rod 73 is disposed at the rear side of the top of the base 1, the storage basket 74 is disposed between the support rod 73 and the support frame 70, the limit ring 75 is disposed at the lower portion of the storage basket 74, and the material-dividing turntable 76 is disposed on the first rotating shaft 72.

Receiving mechanism 8 is equipped with first backup pad 80 including first backup pad 80, connect silo 81 and place the platform 82 on the left of base 1 top, and first backup pad 80 top is equipped with connects silo 81, connects the silo 81 lower part to be equipped with place the platform 82.

The working personnel place the lithium battery in the material storage basket 74, then start the servo motor 71 to work, the servo motor 71 drives the first rotating shaft 72 to rotate, the first rotating shaft 72 drives the material distribution turntable 76 to rotate, the lithium battery rolls down to the material distribution turntable 76 along the material storage basket 74 and is clamped in the material distribution turntable 76 one by one, the material distribution turntable 76 discharges the lithium battery one by one, the lithium battery rolls down to the material receiving groove 81 from the material distribution turntable 76 and rolls to the designated position of the placing platform 82 along the material receiving groove 81, at the moment, the working personnel press the first connecting plate 2 downwards, the first spring 4 is compressed, the first connecting plate 2 drives the paint spraying block 5 and the meshing block 6 to move downwards, the meshing block 6 clamps the lithium battery, the code spraying block 5 sprays codes on the surface of the lithium battery, after the code spraying is finished, the first connecting plate 2 is loosened, under the reset action of the first spring 4, the first connecting plate 2 and all the components thereon are driven to move upwards to reset, and then, taking out the lithium batteries subjected to code spraying by the staff, and closing the servo motor 71 after the code spraying of all the lithium batteries is finished.

Example 3

On the basis of embodiment 2, as shown in fig. 5 to 9, the device further includes a pressing mechanism 9, the pressing mechanism 9 includes a second supporting plate 90, a second rotating shaft 91, a cam 92 and a first pulley assembly 93, the second supporting plate 90 is disposed on the front side of the top of the base 1, the second rotating shaft 91 is rotatably disposed on the top of the second supporting plate 90, the cam 92 is disposed on the second rotating shaft 91, the first pulley assembly 93 is disposed between the first rotating shaft 72 and the second rotating shaft 91, the first pulley assembly 93 is composed of two pulleys and a belt, the two pulleys are respectively connected to the first rotating shaft 72 and the second rotating shaft 91, and the belt is wound between the pulleys.

First pivot 72 drives second pivot 91 through first pulley assembly 93 and rotates, second pivot 91 drives cam 92 and rotates, when cam 92 rotates to pushing down and moves first connecting plate 2, drive first connecting plate 2 and all last parts and all move down, first spring 4 is all compressed, thereby press from both sides tightly and spout the sign indicating number to the lithium cell, when cam 92 rotates to no longer pushing down first connecting plate 2, under first spring 4's reset action, drive first connecting plate 2 and all last parts and all move up and reset.

The novel placing platform is characterized by further comprising a toggle mechanism 10, wherein the toggle mechanism 10 comprises a wedge-shaped plate 100, a first connecting plate 101, a torsion spring 102, a rotating rod 103, a second connecting plate 104, a second connecting rod 105, a push rod 106, a guide sleeve 107 and a second spring 108, the wedge-shaped plate 100 is arranged on the front side of the first connecting plate 2, the first connecting plate 101 is arranged on the front side of the top of the base 1 in a rotating mode, the torsion spring 102 is arranged between the first connecting rod 101 and the base 1, the rotating rod 103 is arranged on the first connecting rod 101, the rotating rod 103 is matched with the wedge-shaped plate 100, the second connecting plate 104 is arranged on the first connecting plate 101, the second connecting rod 105 is arranged on the second connecting rod 104, the push rod 106 is arranged on the second connecting rod 105 in a rotating mode, the guide sleeve 107 is arranged on the right side of the placing platform 82, the push rod 106 is connected with the guide sleeve 107 in a sliding mode, the second spring 108 is arranged between the push rod 106 and the guide sleeve 107, and the second spring 108 is sleeved on the push rod 106.

When the first connecting plate 2 moves downwards, the wedge plate 100 is driven to move downwards, the wedge plate 100 is in contact with the rotating rod 103, the rotating rod 103 drives the first connecting rod 101 to rotate anticlockwise, the torsion spring 102 deforms, the first connecting rod 101 drives the second connecting plate 104 to rotate, the second connecting plate 104 drives the push rod 106 to slide leftwards on the guide sleeve 107, the second spring 108 is stretched, the push rod 106 pushes out the lithium batteries subjected to code spraying leftwards, the lithium batteries can be collected by a worker at the moment, when the first connecting plate 2 moves upwards and resets, the wedge plate 100 is driven to move upwards, the wedge plate 100 is not in contact with the rotating rod 103 any more, under the resetting action of the torsion spring 102, the first connecting rod 101 and all the components thereon are driven to rotate and reset, the second connecting plate 104 drives the push rod 106 to slide rightwards and reset, and the second spring 108 resets.

Still including placing mechanism 11, placing mechanism 11 is including placing basket 110, stopper 111, second guide bar 112, third spring 113 and third connecting plate 114, 1 top left front side of base is equipped with places basket 110, place two stopper 111 at basket 110 top, it is equipped with two second guide bar 112 to place basket 110 left side slidingtype, be equipped with third connecting plate 114 between second guide bar 112 top, third connecting plate 114 and place and be equipped with two third spring 113 between the basket 110, third spring 113 all overlaps on second guide bar 112.

The material pushing device further comprises a material pushing mechanism 12, the material pushing mechanism 12 comprises a third supporting plate 120, a third rotating shaft 121, a second belt pulley assembly 122, a slide rail frame 123, a special-shaped wheel 124, a third connecting rod 125, a fourth spring 126 and a push plate 127, the third supporting plate 120 is arranged on the right front side of the top of the base 1, the third supporting plate 120 is rotatably connected with the second rotating shaft 91, the third rotating shaft 121 is rotatably arranged on the lower portion of the third supporting plate 120, the second belt pulley assembly 122 is arranged between the second rotating shaft 91 and the third rotating shaft 121, the second belt pulley assembly 122 is composed of two belt pulleys and a belt, the two belt pulleys are respectively connected to the second rotating shaft 91 and the third rotating shaft 121, the belt pulley is arranged between the belt pulleys, the slide rail frame 123 is arranged on the right front side of the top of the base 1 in a winding manner, the special-shaped wheel 124 is arranged on the third rotating shaft 121, the special-shaped wheel 124 is provided with a sliding groove, the special-shaped wheel 124 is rotatably connected with the slide rail frame 123, the slide rail frame 123 is slidably provided with the push plate 127, the push plate 127 is provided with a third connecting rod 125, the third connecting rod 125 is matched with the special-shaped wheel 124, and a fourth spring 126 is arranged between the push rod 106 and the slide rail frame 123.

The worker places the storage basket on the top of the placement basket 110, the storage basket is located on the left sides of the two limit blocks 111 and contacts with the third connecting plate 114, meanwhile, the second rotating shaft 91 drives the third rotating shaft 121 to rotate through the second belt pulley assembly 122, the third rotating shaft 121 drives the special-shaped wheel 124 to rotate, the special-shaped wheel 124 rotates to enable the third connecting rod 125 to slide along the sliding groove on the special-shaped wheel 124, when the push rod 106 pushes the lithium battery leftwards, the third connecting rod 125 slides leftwards along the sliding groove on the special-shaped wheel 124, the fourth spring 126 is stretched, so as to drive the push plate 127 to push the storage basket leftwards, the storage basket drives the third connecting plate 114 to move leftwards, the third spring 113 is compressed, the lithium battery falls into the storage basket from the left side of the placement platform 82, when the push rod 106 slides rightwards to reset, at this time, under the reset action of the fourth spring 126, the push rod 106 drives the third connecting rod 125 to slide rightwards along the sliding groove on the special-shaped wheel 124 to reset, thereby make push pedal 127 no longer promote and accomodate the basket, simultaneously under third spring 113's reset effect, drive through third connecting plate 114 and accomodate the basket and slide right and support two stopper 111 to the realization is received material one by one.

Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.