US5795419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for adjusting the operating frequency of an orbital motion producing vibratory welding system
Assignee: Branson Ultraschall Niederlassung der Emerson Technologies GmbH and Co OHG
•
Filing: 1996-04-05
•
Granted: 1998-08-18
•
Expires: 2016-04-05
Abstract
Abstract The invention relates to a method for adjusting the operating frequency of a vibratory welding system producing orbital motion comprising a workpiece socket head which is mounted to resilient means. The head is driven by electromagnetic means to produce orbital vibrations to be constricted to a vibratory plane for welding workpieces, in particular made of plastic material, wherein the frequency is varied within a predetermined range of frequencies to detect the geometrical configuration of the vibration, followed by selecting the frequency exhibiting the best possible vibratory configuration and defining the operating frequency to which the system will be adjusted.
Inventors
- 👤 Wilfried Lotz
- 👤 Heiko Priem
- 👤 Gerd Reitmayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:10
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/06; B29C65/0609; B29C65/0627; B23; B23K; B23K20/00; B23K20/12; B23K20/121; B29C66/00; B29C66/90; B29C66/95; B29C66/951; B29C66/9512
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
In a method for adjusting the operating frequency of an orbital vibratory welding system including a welding head receiving a workpiece, resilient means to which the head is mounted and electromagnetic means for driving the head which is subjected to orbital vibrations having a geometrical configuration constricted to a vibratory plane, the improvement comprising the steps of: varying the operating frequency in a predetermined range of frequencies, sensing the geometrical configuration of the orbital vibrations, and selecting an optimum frequency resulting in an optimum geometrical configuration of the orbital vibrations and adjusting the operating frequency of the welding system to the optimum frequency.
Claim 2
Dependent Claim
103 words
In a method for adjusting the operating frequency of an orbital vibratory welding system including a welding head receiving a workpiece, resilient means to which the head is mounted and electromagnetic means for driving the head which is subjected to orbital vibrations having a geometrical configuration constricted to a vibratory plane, the improvement comprising the steps of: varying the operating frequency in a predetermined range of frequencies, sensing the geometrical configuration of the orbital vibrations, and selecting an optimum frequency resulting in an optimum geometrical configuration of the orbital vibrations and adjusting the operating frequency of the welding system to the optimum frequency.
Claim 3
Dependent Claim
64 words
The method of claim 1 wherein the step of varying the operating frequency includes varying the frequency in a predetermined frequency range until a resonant frequency associated with a current minimum or power minimum is detected, and varying the operating frequency towards at least one of higher and lower values starting from said resonant frequency, while measuring the geometrical configuration of the orbital vibration.
Claim 4
Dependent Claim
48 words
The method of claim 1 or 2, and further comprising the step of determining whether or not a stable vibratory configuration results for the operating frequency which has been selected and adjusted, and the step of selecting and adjusting the resonant frequency for a non stable vibratory configuration.
Claim 5
Dependent Claim
32 words
The method of claim 1, wherein the optimum geometrical configuration is defined by a best possible circular configuration or elliptical configuration or by a linear vibratory configuration depending on the workpiece geometry.
Claim 6
Dependent Claim
135 words
In an orbital vibrating welding system including a welding head receiving a workpiece, resilient means to which the head is mounted, electromagnetic means including current windings for driving the head into orbital vibrations having a geometrical configuration constricted to a vibratory plane, and a controller coupled to the electromagnetic means, the improvement comprising: first sensing means for sensing the geometrical configuration of the orbital vibrations of the head, second sensing means for sensing the current in the windings, and a processor operating under stored program control and coupled to the controller and to said first and second sensing means for supplying to the controller output voltage signals for causing the controller to adjust the frequency of the current in the electromagnetic means to a predetermined frequency corresponding to an optimum geometrical configuration of orbital vibrations.
Claim 7
Dependent Claim
135 words
In an orbital vibrating welding system including a welding head receiving a workpiece, resilient means to which the head is mounted, electromagnetic means including current windings for driving the head into orbital vibrations having a geometrical configuration constricted to a vibratory plane, and a controller coupled to the electromagnetic means, the improvement comprising: first sensing means for sensing the geometrical configuration of the orbital vibrations of the head, second sensing means for sensing the current in the windings, and a processor operating under stored program control and coupled to the controller and to said first and second sensing means for supplying to the controller output voltage signals for causing the controller to adjust the frequency of the current in the electromagnetic means to a predetermined frequency corresponding to an optimum geometrical configuration of orbital vibrations.
Claim 8
Dependent Claim
68 words
The apparatus of claim 5, wherein said processor includes means for varying the frequency of the current in the electromagnetic means in a predetermined frequency range until a resonant frequency associated with a current minimum or power minimum is detected, and varying the operating frequency toward at least one of higher and lower values starting from said resonant frequency, while measuring the geometrical configuration of the orbital vibrations.
Claim 9
Dependent Claim
37 words
The welding system of claim 5, wherein said processor includes means for determining whether or not a stable geometrical configuration results for the operating frequency, and selecting and adjusting the resonant frequency for a non-stable vibratory configuration.
References Cited (Backward Citations)
US4606490A
Cited
US4631685A
Cited
US4844320A
Cited
EP0504494A2
Cited
EP0498936A1
Cited
US5314105A
Cited
DE4211279A1
Cited
GB2270868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-08-17 | 2002-02-16 | 2002-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-17 | 2006-02-16 | 2006-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-17 | 2010-02-16 | 2010-08-18 | $7700.00 | Window Closed / Lapsed |