US4026331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jointing of fabric ends to form an endless structure
Assignee: Scapa Blackburn Ltd
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Filing: 1975-09-02
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Granted: 1977-05-31
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Expires: 1995-09-02
Abstract
Abstract Loops are created at the ends of a woven papermaking machine forming fabric by a method which comprises removing weft yarns from the end of the fabric to give a weft-free zone, shortening selected ones of the warp yarns in the region of the weft-free zone, folding back the uncut warp yarns into register with respective ones of the shortened warp ends to form loops spaced transversely of the fabric, and introducing weft yarns into the resultant weftless end of the forming fabric, the crimp pattern of the individual uncut warp ends being such that when the ends are folded back the overall crimp pattern of the warp yarns in the weftless end of the forming fabric is compatible with that of the body of the forming fabric.
Inventors
- 👤 David Logan Lees
- 👤 Colin Alfred Wild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:16
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/0027; D21F1/0054
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
230 words
For use with a paper machine, a forming fabric having a body and a crimp pattern, comprising: a first group of warp yarns including first warp yarns folded back and second warp yarns in alignment and substantial abutment with said first warp yarns to form a first group of loops; a second group of warp yarns including third warp yarns folded back and fourth warp yarns in alignment and substantial abutment with said third warp yarns to form a second group of loops; said second group of loops being spaced from said first group of loops inwardly of the fabric body a distance substantially equal to the spacing between weft yarns in the fabric so that when an end weft yarn is received through the loops in said first group of loops, the end weft yarn can be supported by loops in said second group of loops; said loops being located at each end of the fabric body and cooperating with corresponding loops located at an adjacent opposed end of an adjacent fabric body to receive a retaining member and thereby form a seam; said folded back warp yarns each having an inherent crimp therein which is compatible with the crimp pattern of the fabric body; and individual warp yarns of said folded back warp yarns being distributed regularly widthwise of the fabric so that a warp cover exceeds 80%.
Claim 2
Dependent Claim
230 words
For use with a paper machine, a forming fabric having a body and a crimp pattern, comprising: a first group of warp yarns including first warp yarns folded back and second warp yarns in alignment and substantial abutment with said first warp yarns to form a first group of loops; a second group of warp yarns including third warp yarns folded back and fourth warp yarns in alignment and substantial abutment with said third warp yarns to form a second group of loops; said second group of loops being spaced from said first group of loops inwardly of the fabric body a distance substantially equal to the spacing between weft yarns in the fabric so that when an end weft yarn is received through the loops in said first group of loops, the end weft yarn can be supported by loops in said second group of loops; said loops being located at each end of the fabric body and cooperating with corresponding loops located at an adjacent opposed end of an adjacent fabric body to receive a retaining member and thereby form a seam; said folded back warp yarns each having an inherent crimp therein which is compatible with the crimp pattern of the fabric body; and individual warp yarns of said folded back warp yarns being distributed regularly widthwise of the fabric so that a warp cover exceeds 80%.
Claim 3
Dependent Claim
29 words
A forming fabric as claimed in claim 1, wherein a loop forming warp yarn is arranged in alignment and substantial abutment with the next adjacent, and shortened, warp yarn.
Claim 4
Dependent Claim
16 words
A forming fabric as claimed in claim 2, wherein alternate warp yarns are loop forming yarns.
Claim 5
Dependent Claim
33 words
A forming fabric as claimed in claim 1, wherein a loop forming warp yarn is arranged in alignment with a shortened warp yarn laterally spaced therefrom by the space of three warp yarns.
Claim 6
Dependent Claim
27 words
A forming fabric as claimed in claim 4, wherein loop forming yarns are arranged in pairs, successive pairs being separated by corresponding pairs of shortened warp yarns.
Claim 7
Dependent Claim
31 words
A forming fabric as claimed in claim 1, wherein the warp and weft yarns are of substantially the same order of diameter and the "warp cover" is not less than 80%.
Claim 8
Dependent Claim
21 words
A forming fabric as claimed in claim 1, wherein the warp yarn is of a lesser diameter than the weft yarn.
Claim 9
Dependent Claim
32 words
A forming fabric as claimed in claim 7, wherein the difference between the diameters of the warp and weft yarns is within the range of 10% to 30% of the warp diameter.
Claim 10
Dependent Claim
37 words
A forming fabric as claimed in claim 1 wherein the position longitudinally of the fabric at which the loop forming warp yarns meet the respective shortened warp yarns varies from position to position widthwise of the fabric.
Claim 11
Dependent Claim
17 words
A forming fabric as claimed in claim 1 wherein the warp and weft yarns are monofilament yarns.
Claim 12
Dependent Claim
18 words
A forming fabric as claimed in claim 1, wherein the fabric structure comprises a 2 and 2 twill.
Claim 13
Dependent Claim
207 words
For use with a paper machine, a forming fabric having a body and a crimp pattern, comprising: a first group of warp yarns including first warp yarns folded back and second warp yarns in alignment and substantial abutment with said first warp yarns to form a first group of loops; a second group of warp yarns including third warp yarns folded back and fourth warp yarns in alignment and substantial abutment with said third warp yarns to form a second group of loops; said second group of loops being spaced from said first group of loops inwardly of the fabric body a distance substantially equal to the spacing between weft yarns in the fabric so that when an end weft yarn is received through the loops in said first group of loops, the end weft yarn can be supported by loops in said second group of loops; said loops being located at each end of the fabric body and cooperating with corresponding loops located at an adjacent opposed end of an adjacent fabric body to receive a retaining member and thereby form a seam; and said folded back warp yarns each having a inherent crimp therein which is compatible with the crimp pattern of the fabric body.
Claim 14
Dependent Claim
207 words
For use with a paper machine, a forming fabric having a body and a crimp pattern, comprising: a first group of warp yarns including first warp yarns folded back and second warp yarns in alignment and substantial abutment with said first warp yarns to form a first group of loops; a second group of warp yarns including third warp yarns folded back and fourth warp yarns in alignment and substantial abutment with said third warp yarns to form a second group of loops; said second group of loops being spaced from said first group of loops inwardly of the fabric body a distance substantially equal to the spacing between weft yarns in the fabric so that when an end weft yarn is received through the loops in said first group of loops, the end weft yarn can be supported by loops in said second group of loops; said loops being located at each end of the fabric body and cooperating with corresponding loops located at an adjacent opposed end of an adjacent fabric body to receive a retaining member and thereby form a seam; and said folded back warp yarns each having a inherent crimp therein which is compatible with the crimp pattern of the fabric body.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |