US4590874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tension regulator for elastic tape and the like, particularly in sewing machines adapted to attach tape to a workpiece
Assignee: RAM ELETTRONICA DI BACLAGIS LUCA & C SNC
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Filing: 1984-08-13
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Granted: 1986-05-27
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Expires: 2004-08-13
Abstract
Abstract The invention pertains to a tension regulator for elastic tape and the like, particularly in sewing machines adapted to attach tape to a workpiece. This regulator substantially consists of an electromechanical transducer on which the stress produced by tensioning the tape causes a mechanical deformation converted into an electrical signal; this electrical signal, suitably processed, controls a motor means which acts so as to feed or take up tape in order to keep the tension of the same at a constant value.
Inventors
- 👤 Luca Baclagis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:58
CPC Classifications
B; B65; B65H; B65H59/00; B65H59/38; B65H59/384; B65H59/388; B65H23/00; B65H23/04; B65H23/18; B65H23/188; B65H23/1888; B65H51/00; B65H51/02; B65H51/04; B65H51/06; B65H59/40; D; D05; D05B; D05B35/00; D05B35/06; B65H2553/00; B65H2553/20; B65H2553/21; D05D; D05D2303/00; D05D2303/02; D05D2303/04; D05D2305/00; D05D2305/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
194 words
A tension regulator for elastic tape and the like, suitable for use in sewing machines adapted to attach tape to a workpiece, comprising: a pulley fitted to rotate about its own axis, located along the track of the tape between a tape feeding bobbin and the sewing machine's presser foot wherein said tape is wound about a part of the circumference of said pulley during its travel; electromechanical transducer means to which the axis of rotation of said pulley is integrally connected and on which the stress caused by the tension of the tape acts, which is adapted to convert the deformation produced by said stress on its mechanical part into an electric signal; motor means suitable to drivingly feed said tape to said presser foot, with respect to a tension force for the feed of tape depending upon the request from the sewing machine and said electric signal from said transducer means; electric comparator means for comparing said electric signal from said transducer with a preselected reference signal and to deliver a command to a processor means; and processor means adapted to convert said command into a driving signal for said motor means.
Claim 2
Dependent Claim
194 words
A tension regulator for elastic tape and the like, suitable for use in sewing machines adapted to attach tape to a workpiece, comprising: a pulley fitted to rotate about its own axis, located along the track of the tape between a tape feeding bobbin and the sewing machine's presser foot wherein said tape is wound about a part of the circumference of said pulley during its travel; electromechanical transducer means to which the axis of rotation of said pulley is integrally connected and on which the stress caused by the tension of the tape acts, which is adapted to convert the deformation produced by said stress on its mechanical part into an electric signal; motor means suitable to drivingly feed said tape to said presser foot, with respect to a tension force for the feed of tape depending upon the request from the sewing machine and said electric signal from said transducer means; electric comparator means for comparing said electric signal from said transducer with a preselected reference signal and to deliver a command to a processor means; and processor means adapted to convert said command into a driving signal for said motor means.
Claim 3
Dependent Claim
68 words
A regulator according to claim 1, wherein said motor means comprises: a pair of rollers disposed along the track of the tape between the feed bobbin and the pulley, which are urged into contact with each other and between which said tape is caused to pass; an electric motor, actuated by said driving signal, operatively connected to at least one of said rollers to drivingly rotate the same.
Claim 4
Dependent Claim
38 words
A regulator according to claim 1, wherein said motor means comprises an electric motor actuated by said driving signal, which is integrally connected to said electromechanical transducer and to the shaft of which said pulley is integrally connected.
Claim 5
Dependent Claim
70 words
A regulator according to claim 1, wherein said electromechanical transducer comprises: a bar one end of which is fixedly restrained within the body of the regulator and the other end of which is free and bears the axis of rotation of said pulley which is integrally connected thereto; and an electrical measuring means located on said bar, adapted to detect the deformations and to convert them into an electrical signal.
Claim 6
Dependent Claim
120 words
A regulator according to claim 4, wherein said bar consists of four portions that are rigid when submitted to bending stresses and connected to each other by means of four further portions that are elastic if submitted to bending stresses so as to form all together an articulated quadrilateral, one of said rigid portions being fixedly restrained within the body of the regulator and the portion opposite thereto bearing the axis of rotation of said pulley; four electric strain gauge measuring means being provided, each of them connected to said bar in correspondence of an elastic portion thereof and the electrical signals of which are algebraically summed up; said algebraic sum forming the electrical signal sent to said electrical comparator.
Claim 7
Dependent Claim
35 words
A regulator according to claim 1, wherein said pulley exhibits a race defined by two flanks one of which is slidable in an axial direction thereby allowing the width of said race to be varied.
Claim 8
Dependent Claim
49 words
A regulator according to claim 1, further comprising: a number of generators producing electrical reference signals; a switch adapted to select one of said generators; an encoder connected to said pulley and suitable to convert the angular position thereof into a digital switching signal capable of controlling said switch.
Claim 9
Dependent Claim
35 words
A regulator according to claim 1, further comprising a support, completely detached from a sewing machine to which said regulator is applied, to this support being integrally connected said regulator and said tape feed bobbin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |