CA1106262A - Method of supplying weft thread in needle loom - Google Patents
Method of supplying weft thread in needle loomInfo
- Publication number
- CA1106262A CA1106262A CA327,534A CA327534A CA1106262A CA 1106262 A CA1106262 A CA 1106262A CA 327534 A CA327534 A CA 327534A CA 1106262 A CA1106262 A CA 1106262A
- Authority
- CA
- Canada
- Prior art keywords
- weft thread
- filling carrier
- tension
- needle loom
- drawn out
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/02—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein loops of continuous weft thread are inserted, i.e. double picks
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/34—Handling the weft between bulk storage and weft-inserting means
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Disclosed is a method of supplying a weft thread to a filling carrier by which the weft thread is inter-mittently drawn out for insertion through successive warp sheds in a needle loom. The weft thread is positively paid out from a cheese at variable speed according to the mount of the weft thread drawn out by the filling carrier.
The weft thread tension is regulated to remain constant by the action of spring.
Disclosed is a method of supplying a weft thread to a filling carrier by which the weft thread is inter-mittently drawn out for insertion through successive warp sheds in a needle loom. The weft thread is positively paid out from a cheese at variable speed according to the mount of the weft thread drawn out by the filling carrier.
The weft thread tension is regulated to remain constant by the action of spring.
Description
11~62GZ
This invention relates generally to needle looms, and more particularly to a method of supplying a weft thread in a needle loom.
In conventional needle looms, it has been a common -~
practice to control the degrees of tension of a weft thread when supplying the latter to a filling carrier simply with the use of a tension control device of known construction.
The tension control device includes a pair of opposed resili-ent members each having an eye in its free end for guiding 10the weft thread therethrough. On its path of travel to the filling carrier, the weft thread extends through the two eyes of the resilient members and then an eye of the filling carrier. As the filling carrier reciprocates to intermit-tently draw out the weft thread for insertion through suc-cessive warp sheds, the weft thread becomes alternately taut and loose. This tension change causes the opposed -resilient members to bend and restore so as to move their eyes toward and away from each other depending on the amount of tension of the weft thread. Thus, the weft thread tension is automatically controlled to remain constant during weaving.
However, because of its limited mechanical and functional properties, this tension control device does not work reliably when used in modern high-speed needle looms.
According to this invention, there is provided a -method of supplying a weft thread to a filling carrier by which the weft thread is intermittently drawn out for inser-tion through successive warp sheds during weaving in a needle loom. The method comprises thesteps of feeding ~ -'.
.
11~;6,Z~Z
the weft thread at variable speed according to the amount of the weft thread drawn out by the filling carrier, and regulating the degree of tension of the weft thread.
Accordingly, it is an object of the invention to provide a method of supplying a weft thread to a filling carrier, which enables a tension control device of known construction to be utilized in high-speed weaving.
Other objects, features and advantages of this inven-tion will become apparent by referring to the following description taken in conjunction with the accompanying drawing.
Fig. 1 is a schematic plan view, with parts broken away, of a needle loom which is used to carry the method of the invention into practice; and Fig. 2 is an enlarged plan view of a speed-changing mechanism.
With reference to Fig. 1, there is fragmentarily and schematically shown a needle loom, generally indicated by the numeràl 10, for weaving a fabric 11 of a weft thread 12 and warp threads 13.
The needle loom 10 essentially comprises a plurality of harnesses 14 for forming sheds by raising and lowering the warp threads 13 selectively, a filling carrier 15 for inserting the weft thread 12 through the warp sheds, a latch needle 16 reciprocatable in warp direction alonside of one of longitudinal edge of the fabric 11 for catching and knitting the weft thread 12 in the warp shed so as to form a selvedge along said one longitudinal fabric edge, 11~621~2 and a reed 18 for beating the weft thread 12 in the warp shed against the fell of the fabric 11.
Alongside of the warp threads 13, the weft thread 12 extends from a cheese (not shown) of known construction to the fabric 11 via a pair of feed rollers 19,20, a tension control device 21, and an eye 22 of the filling carrier 15.
The tension control device 21 includes a pair of opposed resilient members 23,24 each generally of a dogleg-shape, a pair of inlet and outlet guides 25,26, and`an intermediate guide 27. Each resilient member 23(24) is fixed on its spiral end to a stationary pin 28 (29), and has an eye 30(31) in its free end. In the tension control device 21, the weft thread 12 travels via the inlet guide 25, the intermediate guide 27, the eyes 30,31, and the outlet guide 26.
As the filling carrier 15 reciprocates into and out of the successive warp sheds to insert the weft thread 12 therethrough, the weft thread 12 is intermittently drawn out, causing the weft thread 12 to become alternately taut and loose. Instantaneously, this tension change in turn causes the opposed resilient members 23,24 to bend and restore such that their eyes 30,31 move toward and away from each other depending on the amount of resultant tension of the weft thread 12. Thus, the weft thread tension is controlled to remain constant by the action of spring.
Designated at 17 is the orbit which the eye 22 of the filling carrier 15 follows as the latter reciprocates.
In order to minimize the amout of the tension change il~6~ ;i2 to be corrected by the tension control device 21, the weft thread 12 is fed by the feed rollers 19,20 at variable speed according to the amount of the weft thread 12 drawn out by filling carrier 15, the feed rollers 19,20 being located upstream of the tension control device 21.
Proper speed changes of the feed rollers 19,20 may be obtained by a speed-changing mechanism such as shown in Fig. 1, generally designated at 32. As best shown in Fig. 2, the mechanism 32 essentially comprises a gear train including a pair of spaced first and second sun gears 33,34 and a planet gear 35 interposed between the two sun gears 33,34 and meshing therewith, the first sun gear 33 being eccentri-cally mounted on a driving shaft 36. The planet gear 35 is carried by a pair of first and second links 37,38 so as to roll on both first and second sun gears 33,34 in continual mesh therewith as these gears 33,34,35 rotate. Assuming that the first sun gear 33 makes one complete rotation counter-clockwise (Fig. 2) with constant angular speed, namely, with variable peripheral speed, the planet gear 35 rotates clockwise at variable speed and thus the second sun gear 34 rotates counterclockwise at variable speed. An endless belt 39 is wound around a pair pullays 40,41 concentrically fixed with respect to the second sun gear 34 and said one of the feed rollers 19, respectively, for rotating the feed rollers 19,20 at variable speed - alternately at high and low speeds. The feed roller 20 is a pinch roller. This ~ -speed change of the feed rollers 19,20 is timed with the filling carrier motion; that is, these feed rollers 19,20 are rotated at high speed while the filling carrier 15 is moving into the warp shed and at low speed while the filling carrier 15 is retracting from the warp shed.
A single specific illustrative embodiment of the invention has been described. It will, of course, be appre-ciated however that the invention should not be limited to this specific embodiment since numerous changes and modifications may be made therein as appear obvious to those versed in the art without departing the scope of the appended claims.
This invention relates generally to needle looms, and more particularly to a method of supplying a weft thread in a needle loom.
In conventional needle looms, it has been a common -~
practice to control the degrees of tension of a weft thread when supplying the latter to a filling carrier simply with the use of a tension control device of known construction.
The tension control device includes a pair of opposed resili-ent members each having an eye in its free end for guiding 10the weft thread therethrough. On its path of travel to the filling carrier, the weft thread extends through the two eyes of the resilient members and then an eye of the filling carrier. As the filling carrier reciprocates to intermit-tently draw out the weft thread for insertion through suc-cessive warp sheds, the weft thread becomes alternately taut and loose. This tension change causes the opposed -resilient members to bend and restore so as to move their eyes toward and away from each other depending on the amount of tension of the weft thread. Thus, the weft thread tension is automatically controlled to remain constant during weaving.
However, because of its limited mechanical and functional properties, this tension control device does not work reliably when used in modern high-speed needle looms.
According to this invention, there is provided a -method of supplying a weft thread to a filling carrier by which the weft thread is intermittently drawn out for inser-tion through successive warp sheds during weaving in a needle loom. The method comprises thesteps of feeding ~ -'.
.
11~;6,Z~Z
the weft thread at variable speed according to the amount of the weft thread drawn out by the filling carrier, and regulating the degree of tension of the weft thread.
Accordingly, it is an object of the invention to provide a method of supplying a weft thread to a filling carrier, which enables a tension control device of known construction to be utilized in high-speed weaving.
Other objects, features and advantages of this inven-tion will become apparent by referring to the following description taken in conjunction with the accompanying drawing.
Fig. 1 is a schematic plan view, with parts broken away, of a needle loom which is used to carry the method of the invention into practice; and Fig. 2 is an enlarged plan view of a speed-changing mechanism.
With reference to Fig. 1, there is fragmentarily and schematically shown a needle loom, generally indicated by the numeràl 10, for weaving a fabric 11 of a weft thread 12 and warp threads 13.
The needle loom 10 essentially comprises a plurality of harnesses 14 for forming sheds by raising and lowering the warp threads 13 selectively, a filling carrier 15 for inserting the weft thread 12 through the warp sheds, a latch needle 16 reciprocatable in warp direction alonside of one of longitudinal edge of the fabric 11 for catching and knitting the weft thread 12 in the warp shed so as to form a selvedge along said one longitudinal fabric edge, 11~621~2 and a reed 18 for beating the weft thread 12 in the warp shed against the fell of the fabric 11.
Alongside of the warp threads 13, the weft thread 12 extends from a cheese (not shown) of known construction to the fabric 11 via a pair of feed rollers 19,20, a tension control device 21, and an eye 22 of the filling carrier 15.
The tension control device 21 includes a pair of opposed resilient members 23,24 each generally of a dogleg-shape, a pair of inlet and outlet guides 25,26, and`an intermediate guide 27. Each resilient member 23(24) is fixed on its spiral end to a stationary pin 28 (29), and has an eye 30(31) in its free end. In the tension control device 21, the weft thread 12 travels via the inlet guide 25, the intermediate guide 27, the eyes 30,31, and the outlet guide 26.
As the filling carrier 15 reciprocates into and out of the successive warp sheds to insert the weft thread 12 therethrough, the weft thread 12 is intermittently drawn out, causing the weft thread 12 to become alternately taut and loose. Instantaneously, this tension change in turn causes the opposed resilient members 23,24 to bend and restore such that their eyes 30,31 move toward and away from each other depending on the amount of resultant tension of the weft thread 12. Thus, the weft thread tension is controlled to remain constant by the action of spring.
Designated at 17 is the orbit which the eye 22 of the filling carrier 15 follows as the latter reciprocates.
In order to minimize the amout of the tension change il~6~ ;i2 to be corrected by the tension control device 21, the weft thread 12 is fed by the feed rollers 19,20 at variable speed according to the amount of the weft thread 12 drawn out by filling carrier 15, the feed rollers 19,20 being located upstream of the tension control device 21.
Proper speed changes of the feed rollers 19,20 may be obtained by a speed-changing mechanism such as shown in Fig. 1, generally designated at 32. As best shown in Fig. 2, the mechanism 32 essentially comprises a gear train including a pair of spaced first and second sun gears 33,34 and a planet gear 35 interposed between the two sun gears 33,34 and meshing therewith, the first sun gear 33 being eccentri-cally mounted on a driving shaft 36. The planet gear 35 is carried by a pair of first and second links 37,38 so as to roll on both first and second sun gears 33,34 in continual mesh therewith as these gears 33,34,35 rotate. Assuming that the first sun gear 33 makes one complete rotation counter-clockwise (Fig. 2) with constant angular speed, namely, with variable peripheral speed, the planet gear 35 rotates clockwise at variable speed and thus the second sun gear 34 rotates counterclockwise at variable speed. An endless belt 39 is wound around a pair pullays 40,41 concentrically fixed with respect to the second sun gear 34 and said one of the feed rollers 19, respectively, for rotating the feed rollers 19,20 at variable speed - alternately at high and low speeds. The feed roller 20 is a pinch roller. This ~ -speed change of the feed rollers 19,20 is timed with the filling carrier motion; that is, these feed rollers 19,20 are rotated at high speed while the filling carrier 15 is moving into the warp shed and at low speed while the filling carrier 15 is retracting from the warp shed.
A single specific illustrative embodiment of the invention has been described. It will, of course, be appre-ciated however that the invention should not be limited to this specific embodiment since numerous changes and modifications may be made therein as appear obvious to those versed in the art without departing the scope of the appended claims.
Claims (4)
1. A method of supplying a weft thread to a filling carrier by which the weft thread is intermittently drawn out for insertion through successive warp sheds during weaving in a needle loom, comprising the steps of:
(a) feeding the weft thread at variable speed accord-ing to the amount of the weft thread drawn out by the filling carrier; and (b) regulating the degree of tension of the weft thread.
(a) feeding the weft thread at variable speed accord-ing to the amount of the weft thread drawn out by the filling carrier; and (b) regulating the degree of tension of the weft thread.
2. A method according to claim 1, said variable-speed feeding of the weft thread being timed with the intermittent drawing-out of the weft thread.
3. A method according to claim 1, said weft thread being fed alternately at high and low speeds.
4. A method according to claim 1, said feeding step taking place upstream of said tension regulating step.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53-57444 | 1978-05-15 | ||
| JP5744478A JPS54151664A (en) | 1978-05-15 | 1978-05-15 | Weft yarn feeding method in case of weaving by needle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1106262A true CA1106262A (en) | 1981-08-04 |
Family
ID=13055822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA327,534A Expired CA1106262A (en) | 1978-05-15 | 1979-05-14 | Method of supplying weft thread in needle loom |
Country Status (17)
| Country | Link |
|---|---|
| JP (1) | JPS54151664A (en) |
| AT (1) | AT364904B (en) |
| AU (1) | AU522294B2 (en) |
| BE (1) | BE876260A (en) |
| BR (1) | BR7902746A (en) |
| CA (1) | CA1106262A (en) |
| CH (1) | CH640578A5 (en) |
| DE (1) | DE2919112C2 (en) |
| ES (1) | ES480525A1 (en) |
| FR (1) | FR2426105A1 (en) |
| GB (1) | GB2020707B (en) |
| HK (1) | HK32387A (en) |
| IT (1) | IT1118672B (en) |
| MY (1) | MY8600194A (en) |
| NL (1) | NL7903720A (en) |
| SE (1) | SE437169B (en) |
| SG (1) | SG48685G (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3257983A1 (en) * | 2016-06-15 | 2017-12-20 | Textilma Ag | Ribbon needle loom and corresponding weaving method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3194276A (en) * | 1963-09-20 | 1965-07-13 | Crompton & Knowles Corp | Metering device for weft in looms |
| FR1478294A (en) * | 1966-05-04 | 1967-04-21 | Sulzer Ag | Loom with an intermediate weft thread accumulator |
| NL6712678A (en) * | 1967-09-15 | 1969-03-18 | ||
| GB1287583A (en) * | 1969-01-16 | 1972-08-31 | British Visqueen Ltd | Improvements in the weaving of fabrics |
| FR2164107A5 (en) * | 1971-12-10 | 1973-07-27 | Duplessy Jean | |
| JPS5119860A (en) * | 1974-08-09 | 1976-02-17 | Tsudakoma Ind Co Ltd | Muhishotsukino yokoitokuridashihohotosochi |
-
1978
- 1978-05-15 JP JP5744478A patent/JPS54151664A/en active Pending
-
1979
- 1979-04-26 AT AT0316279A patent/AT364904B/en not_active IP Right Cessation
- 1979-05-01 AU AU46624/79A patent/AU522294B2/en not_active Ceased
- 1979-05-03 GB GB7915418A patent/GB2020707B/en not_active Expired
- 1979-05-07 BR BR7902746A patent/BR7902746A/en unknown
- 1979-05-11 NL NL7903720AA patent/NL7903720A/en not_active Application Discontinuation
- 1979-05-11 DE DE2919112A patent/DE2919112C2/en not_active Expired
- 1979-05-14 CA CA327,534A patent/CA1106262A/en not_active Expired
- 1979-05-14 ES ES480525A patent/ES480525A1/en not_active Expired
- 1979-05-14 IT IT68022/79A patent/IT1118672B/en active
- 1979-05-14 FR FR7912208A patent/FR2426105A1/en active Granted
- 1979-05-14 SE SE7904200A patent/SE437169B/en not_active IP Right Cessation
- 1979-05-15 CH CH451779A patent/CH640578A5/en not_active IP Right Cessation
- 1979-05-15 BE BE0/195168A patent/BE876260A/en not_active IP Right Cessation
-
1985
- 1985-06-19 SG SG486/85A patent/SG48685G/en unknown
-
1986
- 1986-12-30 MY MY194/86A patent/MY8600194A/en unknown
-
1987
- 1987-04-23 HK HK323/87A patent/HK32387A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AT364904B (en) | 1981-11-25 |
| JPS54151664A (en) | 1979-11-29 |
| MY8600194A (en) | 1986-12-31 |
| BE876260A (en) | 1979-09-03 |
| DE2919112C2 (en) | 1982-10-07 |
| BR7902746A (en) | 1979-11-20 |
| ES480525A1 (en) | 1980-01-16 |
| SG48685G (en) | 1986-01-17 |
| IT1118672B (en) | 1986-03-03 |
| AU522294B2 (en) | 1982-05-27 |
| CH640578A5 (en) | 1984-01-13 |
| SE7904200L (en) | 1979-11-16 |
| GB2020707A (en) | 1979-11-21 |
| DE2919112A1 (en) | 1979-11-22 |
| NL7903720A (en) | 1979-11-19 |
| IT7968022A0 (en) | 1979-05-14 |
| ATA316279A (en) | 1981-04-15 |
| HK32387A (en) | 1987-05-01 |
| AU4662479A (en) | 1979-11-22 |
| FR2426105B1 (en) | 1983-10-28 |
| FR2426105A1 (en) | 1979-12-14 |
| GB2020707B (en) | 1982-08-25 |
| SE437169B (en) | 1985-02-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |