Ultrasonic comb horn and methods for using same

• US 5,057,182 A
• Filed: 01/19/1990
• Issued: 10/15/1991
• Est. Priority Date: 01/19/1990
• Status: Expired due to Fees

• Current Assignee: Sonokinetics Group
• Original Assignee: Sonokinetics Group
• Inventors: Wuchinich, David G.
• Primary Examiner(s): Powell, William A.
• Assistant Examiner(s): Sells, J.
• Application Number:
  US07/467,624
• Time in Patent Office: 634 Days
• Field of Search: 156/73.1, 156/73.2, 156/73.3, 156/73.4, 156/580.1, 156/580.2, 156/581, 425/174.2, 228/110, 228/1.1, 264/23, 310/323, 310/325, 310/26, 310/342, 74/155
• US Class Current: 156/580.1
• CPC Class Codes: B06B 3/00 Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
• CPC Class Codes: B29C 65/08 using ultrasonic vibrations non-plastics element to plastics elements B29C65/645
• CPC Class Codes: B29C 65/086 using a rotary anvil
• CPC Class Codes: B29C 65/7894 of continuously moving sheets or webs
• CPC Class Codes: B29C 66/1122 Single lap to lap joints, i.e. overlap joints B29C66/45, B29C66/472, B29C66/52272 take precedence
• CPC Class Codes: B29C 66/234 said joint lines being in the form of tessellations
• CPC Class Codes: B29C 66/45 Joining of substantially the whole surface of the articles methods or apparatus for laminating B32B37/00
• CPC Class Codes: B29C 66/71 characterised by the composition of the plastics material of the parts to be joined welding bar compositions B29C65/125
• CPC Class Codes: B29C 66/712 the composition of one of the parts to be joined being different from the composition of the other part
• CPC Class Codes: B29C 66/73921 characterised by the materials of both parts being thermoplastics
• CPC Class Codes: B29C 66/81433 being toothed, i.e. comprising several teeth or pins comprising a single tooth B29C66/81429, or being patterned
• CPC Class Codes: B29C 66/8145 characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps B29C66/816 and B29C66/818 take precedence; adaptable for making articles or joints of different dimensions B29C66/841
• CPC Class Codes: B29C 66/81469 one placed next to the other in a single line transverse to the feed direction, e.g. shoulder to shoulder sonotrodes
• CPC Class Codes: B29C 66/81811 of the welding jaws
• CPC Class Codes: B29C 66/83411 Roller, cylinder or drum types B29C66/83431 takes precedence; rollers, cylinders or drums moving relative to and tangentially to the parts to be joined B29C66/8362
• CPC Class Codes: B29C 66/83417 said rollers, cylinders or drums being hollow
• CPC Class Codes: B29C 66/836 Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table B29C66/65 takes precedence
• CPC Class Codes: B29C 66/9512 by controlling their vibration frequency
• CPC Class Codes: B29C 66/9513 characterised by specific vibration frequency values or ranges
• CPC Class Codes: B29C 66/9517 characterised by specific vibration amplitude values or ranges
• CPC Class Codes: B29K 2023/06 : PE, i.e. polyethylene
• CPC Class Codes: B29K 2067/00 : Use of polyesters or derivatives thereof, as moulding material

Abstract

A unitary extended width comb horn for generating ultrasonic vibrations over a width of greater than 12 inches for a frequency of 20 kHz wherein such vibrations vary by less than ±10% across the width of the horn. Also, processes utilizing this horn and related devices incorporating same.

Claims

1. A vibration generating apparatus comprising:

means for generating vibrations in a first direction;

a spine member having first and second ends and being operatively associated with the vibration generating means, said spine member being oriented perpendicular to the direction of said generated vibrations; and

a plurality of tine members having a working end for transmitting said generated vibrations and extending perpendicularly from said spine member in the direction of said generated vibrations, each tine member positioned and attached at an antinode location along said spine member and having a length of n Γ

/2 wherein n is an integer and Γ

is equal to c/f where c is the velocity of sound in the apparatus and f is the chosen frequency of vibration, wherein first and second tine members positioned on said spine member opposite the attachment of said vibration generation means are attached at their working end but are otherwise separated by a space extending along their length; and

wherein each other tine member is connected to adjacent tine members only at a points along their length of n Γ

/4 wherein n is an odd integer;

said other tine members forming a symmetrical pattern on each side of a plane passing vertically between said first and second tine members;

wherein the working end of each tine member other than said first and second tine members is separated from the working end of each adjacent tine members.

2. The apparatus of claim 1 wherein the space between said first and second tine members is in the shape of a T.

3. The apparatus of claim 1 wherein a first portion of adjacent tine members other than said first and second tine members is spaced by a T shaped slot.

4. The apparatus of claim 3 wherein each T shaped slot is of a length of about n Γ

/4 .

5. The apparatus of claim 4 wherein the T shaped space between said first and second tine members has a length of about n Γ

/2 .

6. The apparatus of claim 3 wherein a second portion of said adjacent tine members are spaced by an elongated slot.

7. The apparatus of claim 6 wherein said first portion of said tine members is adjacent said spine member and said second portion of said tine members is adjacent said working end.

8. The apparatus of claim 1 having a width of at least 1.2 Γ

.

9. The apparatus of claim 1 having a width of at least 12 inches.

10. The apparatus of claim 1 wherein each tine member has a width of less than one half of the flexual wavelength.

11. The apparatus of claim 1 wherein each tine member has a width of less than 1.414 inches.

12. The apparatus of claim 1 wherein the working end of each separated tine member includes a longitudinal space extending at an angle to the width of said tine member.

13. The apparatus of claim 1 wherein the first and second ends of said spine member each extend beyond the width of the outermost tine members.

14. The apparatus of claim 13 wherein the first and second ends of the spine member are tapered.

15. The apparatus of claim 1 wherein the length of each tine member has a first cross sectional area adjacent said spine member and a second cross sectional area adjacent said working end, with the first cross-sectional area is greater than the second cross sectional area.

16. The apparatus according to claim 1 wherein the working end of each tine member has a non-uniform shape.

17. The apparatus of claim 16 wherein said working end shape is one of tapered, rounded, angled, or patterned.

18. The apparatus of claim 1 wherein said generated vibrations have a uniformity of ±

10% across the width of the apparatus.

19. The apparatus of claim 1 further comprising means for boosting said generated vibrations.

20. The apparatus of claim 19 wherein said boosting means is located between said vibration generating means and said spine member.

31. The apparatus of claim 19 wherein said boosting means is located between said vibration generating means and said spine member.

53. A cleaning apparatus comprising:

the vibration generating apparatus of claim 1;

means for dispensing a cleaning solution adjacent a first side of the vibration generating apparatus toward an item to be cleaned; and

means for removing said cleaning solution from said item to be cleaned, said removing means located adjacent a second side of said vibration generating apparatus;

said cleaning solution being dispensed upon said item prior to contact by said vibration generating apparatus and said cleaning solution being removed from said item after contact by said vibration generating apparatus.

54. The apparatus of claim 53 wherein said dispensing means is a nozzle and said removing means includes a vacuum source.

60. The apparatus of claim 54 wherein said dispensing means is a nozzle and said removing means includes a vacuum source.

21. A vibration generating apparatus comprising:

means for generating vibrations in a first direction;

a spine member having first and second ends and being operatively associated with the vibration generating means, said spine member being oriented perpendicular to the direction of said generated vibrations; and

a plurality of tine members having a working end for transmitting said generated vibrations and extending perpendicularly from said spine member in the direction of said generated vibrations, wherein each tine member is positioned and attached at every other antinode location along said spine member so that each tine member vibrates in the same direction, each tine member having a length of n Γ

/2 wherein n is an integer and Γ

is equal to c/f where c is the velocity of sound in the apparatus and f is the chosen frequency of vibration, and further wherein each tine member is attached at its working end to each adjacent tine member but is separated therefrom by a slot extending substantially along its length, thus forming a unitary working end for the apparatus.

22. The apparatus of claim 21 wherein each slot between adjacent tine members has the shape of a T.

23. The apparatus of claim 21 having a width of at least 1.2 Γ

.

24. The apparatus of claim 21 having a width of at least 12 inches.

25. The apparatus of claim 21 wherein each tine member has a width of less than one half of the flexual wavelength.

26. The apparatus of claim 21 wherein each tine member has a width of less than 1.414 inches.

27. The apparatus of claim 21 wherein the unitary working end has a non-uniform shape.

28. The apparatus of claim 27 wherein said working end shape is one of tapered, rounded, angled, or patterned.

29. The apparatus of claim 21 wherein said generated vibrations have a uniformity of ±

10% across the width of the apparatus.

30. The apparatus of claim 21 further comprising means for boosting said generated vibrations.

55. A cleaning apparatus comprising:

the vibration generating apparatus of claim 21;

means for dispensing a cleaning solution adjacent a first side of the vibration generating apparatus toward an item to be cleaned; and

means for removing said cleaning solution from said item to be cleaned, said removing means located adjacent a second side of said vibration generating apparatus;

said cleaning solution being dispensed upon said item prior to contact by said vibration generating apparatus and said cleaning solution being removed from said item after contact by said vibration generating apparatus.

56. The apparatus of claim 55 wherein said dispensing means is a nozzle and said removing means includes a vacuum source.

32. A vibration generating apparatus comprising:

means for generating vibrations in a first direction;

a spine member having first and second ends and being operatively associated with the vibration generating means, said spine member being oriented perpendicular to the direction of said generated vibrations;

a plurality of tine members having a working end for transmitting said generated vibrations and extending perpendicularly from said spine member in the direction of said generated vibrations, each tine member positioned and attached at an antinode location along said elongated member and having a length of n Γ

/2 wherein n is an integer and Γ

is equal to c/f where c is the velocity of sound in the apparatus and f is the chosen frequency of vibration, wherein first and second tine members positioned on said elongated member opposite the attachment of said vibration generation means are attached at their working end but are otherwise separated by a space extending along their length; and

wherein each other tine member is connected to adjacent tine members only at points along their length of n Γ

/4 wherein n is an odd integer;

said other tine members forming a symmetrical pattern on each side of a plane passing vertically between the mid-point of the spine member;

wherein the working end of each tine member other than said first and second tine members is separated from the working end of each adjacent tine member; and

a plurality of half wavelength extensional resonators mounted symmetrically on said spine member about said plane of symmetry.

33. The apparatus of claim 32 wherein the space between each tine member adjacent said spine has a T shape.

34. The apparatus of claim 33 wherein an odd number of resonators is utilized and the vibration generation means is associated with the even numbered resonators.

35. The apparatus of claim 33 wherein an odd number of resonators is utilized and the vibration generating means is associated with the odd numbered resonators.

36. The apparatus of claim 35 wherein the T shaped space between tine members opposite said transducers is of a longer length than the T shaped space between other tine members.

37. The apparatus of claim 35 wherein the working end of said other tine members is separated from that of adjacent tine members.

38. The apparatus of claim 37 wherein the working end of each separated tine member includes a longitudinal space extending at an angle to the width of said tine member.

39. The apparatus of claim 32 wherein the first and second ends of said spine member each extend beyond the width of the outermost tine members.

40. The apparatus of claim 39 wherein the first and second ends of the spine member are tapered.

41. The apparatus of claim 32 wherein the length of each tine member has a first cross sectional area adjacent said spine member and a second cross sectional area adjacent said working end, with the first cross-sectional area is greater than the second cross sectional area.

42. The apparatus of claim 33 wherein an even number of resonators is utilized and said vibration generating means is associated with a predetermined number of said resonators.

43. The apparatus of claim 33 wherein an even number of resonators is utilized and said vibration generating means is associated with each resonator.

44. The apparatus of claim 43 wherein each T shaped space has substantially the same length.

57. A cleaning apparatus comprising:

the vibration generating apparatus of claim 32;

means for dispensing a cleaning solution adjacent a first side of the vibration generating apparatus toward an item to be cleaned; and

means for removing said cleaning solution from said item to be cleaned, said removing means located adjacent a second side of said vibration generating apparatus;

said cleaning solution being dispensed upon said item prior to contact by said vibration generating apparatus and said cleaning solution being removed from said item after contact by said vibration generating apparatus.

58. The apparatus of claim 57 wherein said dispensing means is a nozzle and said removing means includes a vacuum source.

59. A cleaning apparatus comprising:

the vibration generating apparatus of claim 43;

means for dispensing a cleaning solution adjacent a first side of the vibration generating apparatus toward an item to be cleaned; and

means for removing said cleaning solution from said item to be cleaned, said removing means located adjacent a second side of said vibration generating apparatus;

said cleaning solution being dispensed upon said item prior to contact by said vibration generating apparatus and said cleaning solution being removed from said item after contact by said vibration generating apparatus.

45. A vibration generating apparatus comprising:

a plurality of piezoelectric crystals in adjacent spatial relation;

means for energizing said crystals in a manner which causes vibration thereof;

a support for transmitting vibrations generated by said crystals;

means for mechanically coupling said crystals to said support; and

means for removing heat caused by vibration of said crystals comprising boron nitride powder and means for retaining said powder about said crystals and in contact therewith.

46. The apparatus of claim 45 wherein said plurality of crystals comprises a number of pairs of stacked piezoelectric disks with means disposed between each pair of stacked disks for providing an electrical connection to one side of each disk.

47. The apparatus of claim 46 wherein two pair of stacked disks are utilized and said electrical connection means comprises a metallic electrode.

48. The apparatus of claim 46 wherein each of said stacked disks includes a central aperture and wherein said mechanical coupling means comprises an elongated member having a head portion of a cross-section which is larger than that of the disk apertures, a body portion capable of passing through said disk apertures, and a forward end for attachment to said support, thus fastening said disks thereto.

49. A vibration generating apparatus comprising:

a plurality of piezoelectric crystals in adjacent spatial relation;

means for energizing said crystals in a manner which causes vibration thereof;

a support for transmitting vibrations generated by said crystals;

means for mechanically coupling said crystals to said support; and

means for removing heat caused by vibration of said crystals wherein said heat removing means comprises an enclosure mounted upon said support and positioned about said crystals, and a heat transfer medium comprising an electrically non-conductive, thermally conductive powder contained therewithin.

50. The apparatus of claim 49 wherein the heat transfer medium is boron nitride powder and said enclosure includes a plurality of fin members for dissipating heat.

51. The apparatus of claim 49 wherein the heat transfer medium is boron nitride powder and said enclosure further includes a jacket element spaced about said enclosure and providing a passage for fluid for cooling said powder.

52. The apparatus of claim 49 wherein said enclosure is mounted upon the support at a node and is hermetically sealed to prevent moisture from contacting said crystals.