US3688808A - Method of preventing a dent from being damaged by a weft yarn during beating and the device for accomplishing the same - Google Patents

Method of preventing a dent from being damaged by a weft yarn during beating and the device for accomplishing the same Download PDF

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US3688808A
US3688808A US98417A US3688808DA US3688808A US 3688808 A US3688808 A US 3688808A US 98417 A US98417 A US 98417A US 3688808D A US3688808D A US 3688808DA US 3688808 A US3688808 A US 3688808A
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cam
dent
cross bar
contact
weft yarn
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US98417A
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Yasunori Uehara
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/60—Construction or operation of slay

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  • ABSTRACT A method and device for undulating a fabric sheet near the fell front so as not to cause the weft yarn to come into contact with the same portion of a dent.
  • the device comprises a cross bar positioned below and in contact with the fabric sheet transversely to the same near the fell front. Rotation of the cloth roller causes an undulating motion of the cross bar so that the fabric sheet is undulated near the fell front, whereby the points of contact between the weft yarn and the dent during beating differs from time to time.
  • the cross bar is drivably coupled with the shaft of a friction roller by means of an angled rod in such a manner that rotation of the friction roller causes an undulating motion of the cross bar.
  • This invention relates to the beating of a weft yarn and more particularly to a method of preventing a dent from being damaged by the weft yarn during beating and the device for accomplishing the same.
  • beating is effected by causing the reed to move a predetermined length of weft in its straightened state to the fell front, with the length of weft kept in contact with substantially the same portion of the dent of the reed.
  • the dent tends to be damaged only at that particular portion contacted by the weft yarn.
  • a hard thread such as one made of polyester fiber
  • the dent becomes unusuable after as short as 1,000 to 2,000 meters of cloth has been produced.
  • FIG. 1 is a schematic view of a loom incorporating the present device
  • FIG. 2 is a detailed view of the present device as shown in FIG. 1;
  • FIG. 3 is a fragmentary view showing another embodiment of this invention.
  • FIG. 1 there is illustrated a loom incorporating the present device.
  • the loom has a warp beam from which a warp array 11 is drawn off to a heald 12 by way of a back rest roller 13.
  • the heald 12 serves to have upper and lower portions 14 and 15 of the parallel warp array 11 extending in their tensioned state so as to form a shed l6 therebetween.
  • Provision of a shuttle or an injection nozzle (not shown) is made for inserting a predetermined length of weft 17 into the warp shed 16.
  • loom also includes a reed 18 which is operated to beat the length of weft 17 so as to produce a fabric sheet 19 immediately after the length of the weft 17 has been inserted into the warp shed 16.
  • the fabric sheet 19 thus woven is supplied through a friction roller 20 to a cloth roller 21, where the sheet 19 is wound thereon.
  • cam means 22 is provided whose shaft 23 is drivably coupled with the shaft 24 of the cloth roller 21 by means of a belt 25.
  • Other coupling means such as a gearing may be used.
  • a plunger 26 mounted in a stationary bracket 27 for reciprocating movement in the vertical direction.
  • the plunger 26 has attached to the lower end thereof a cam follower 28 which is kept in rolling contact with the cam surface of the cam 22, so that the plunger 26 is moved up and down as the cam 22 is rotated.
  • a cross bar 29 Attached to the other end of the plunger 26 is a cross bar 29 which extends below and in contact with the fabric sheet 19 transversely to the same over its entire breadth so as to support it at a location immediately adjacent the fell front30.
  • rotation of the cam 22 causes an undulating motion of the fabric sheet 19 near the fell front 30.
  • the cross bar is shown as supporting and undulating the fabric sheet, it is to be understood that the cross bar could be replaced by a temple bar (not shown) which is directly coupled with the plunger.
  • the cloth roller 21 is rotated to wind the fabric product 19 thereon and simultaneously to rotate the cam 22.
  • Rotation of the cam 22 causes the cam surface to be raised from the position represented by the solid line 31 of FIG. 2 to that of the dotted line 32.
  • the plunger 26 having the cross bar 29 attached to the top thereof is moved upwards, lifting the fabric sheet 19 to the position represented by the dotted line 33.
  • the cam 22 is further rotated, on the other hand, the plunger 26 is caused to move downwards by a downward force exerted by the tensioned fabric sheet 19.
  • the fabric sheet 19 lowers itself together with the plunger 26 up to the position as represented by the solid line 34. In this way, rotation of the cloth roller 21 results in undulation of the fabric sheet 19.
  • the fell front 30 Since the cross bar 29 is positioned below the fabric sheet 19 immediately adjacent the fell front 30, the fell front 30 is undulated, so that the points of contact between the weft yam l7 and the dent 35 of the reed 18 during beating differs from time to time. Therefore, there is little possibility of the dent 35 being damaged only at that particular portion contacted by the weft yarn 17 during beating.
  • FIG. 3 is a fragmentary schematic view showing another embodiment of this invention which is different from that of FIG. 1 in that the cross bar is moved up and down by rotation of the friction roller 20.
  • the friction roller 20 has a cam 36 attached to the shaft 37 thereof.
  • the cam 36 has a cam surface with which a cam follower 38 is kept in rolling contact.
  • the cam follower 38 is attached to one end of an angled rod 39 pivotally mounted in a loom frame as shown at 40.
  • the angled rod 39 has attached to the other end thereof a cross bar 41 which is positioned in a manner to extend below and in contact with the fabric sheet 19 transversely to the same immediately adjacent the fell front 30.
  • rotation of the friction roller 20 causes a pivotal movement of the angled rod 39, so that the fabric sheet 19 is undulated by the cross bar 41 attached to the angled rod 39.
  • the vertical position of the cross bar is related to the rotational angle of the cam even when the cross bar is being lowered. Therefore, by modifying the shape and size of the cam it is possible to control the vertical displacement of the cross bar.
  • the cross bar as shown is undulated by rotation of the cloth roller or friction roller, it is to be noted that other means for driving the cross bar for undulation can be used. In this instance, it is desirable that the cross bar is driven by such means as rotating at a relatively low speed, because the cross bar is undulated at a relatively long period.
  • a device for preventing a dent from being damaged by a weft yarn comprising a cross bar positioned below and in contact with a fabric sheet transversely to the same and located immediately adjacent to the fell front, and means operatively connected to said cross bar for undulating the same together with the fabric sheet so as not to cause the weft yarn to come into contact with the same portion of the dent at each beat-up, said means comprising a plunger mounted in a stationary bracket for reciprocating movement in the vertical direction and having one end operatively connected to said cross bar, a cam follower attached to the other end of said plunger, a cam having a cam surface with which said cam follower is kept in rolling contact, and a driving means for causing said cam to rotate, whereby the points of contact between the dent and the weft yarn during beating differs from time'to time.
  • said driving means comprises a belt for drivably coupling the shaft of a cloth roller with that of said cam.
  • a device in which said drivingmeans comprises a belt for drivably coupling the shaft of a friction roller with that of said cam.
  • a device for preventing a dent from being damaged by a weft yarn comprising a cross bar positioned below and in contact with a fabric sheet transversely to the same and located immediately adjacent to the fell front, and means operatively connected to said cross bar for undulating the same together with the fabric sheet so as not to cause the weft yarn to come into contact with the same portion of the dent at each beat-up, said means comprising an angled rod pivotally mounted in a loom frame and having one end attached to said cross bar, a cam follower attached to the other end of said angled rod, and a cam mounted on the shaft of a friction roller for rotation therewith and having a cam surface with which said cam follower is kept in rolling contact, said friction roller engaging with said fabric sheet which is supplied to a cloth roller and which is wound thereon and being slightly rotated when a beat up is completed by said dent, the cam surface of said cam being a locus of a point which moves as a distance between the point and the axis of said cam is continuously slightly varied

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Abstract

A method and device for undulating a fabric sheet near the fell front so as not to cause the weft yarn to come into contact with the same portion of a dent. The device comprises a cross bar positioned below and in contact with the fabric sheet transversely to the same near the fell front. Rotation of the cloth roller causes an undulating motion of the cross bar so that the fabric sheet is undulated near the fell front, whereby the points of contact between the weft yarn and the dent during beating differs from time to time. In another embodiment, the cross bar is drivably coupled with the shaft of a friction roller by means of an angled rod in such a manner that rotation of the friction roller causes an undulating motion of the cross bar.

Description

United States Patent Uehara 51 Sept. 5, 1972 [54] METHOD OF PREVENTING A DENT FROM BEING DAMAGED BY A WEFT YARN DURING BEATING AND THE DEVICE FOR ACCOMPLISHING THE SAME [72] Inventor: Ya sunoriUehara, flolgyo, Japan [73] Assignee: Nissan Motor Company, Limited,
5/1971 Rambousek ..l39/29l R Primary Examiner-Henry S. Jaudon AttomeyMcCarthy, Depaoli, OBrien & Price 7] ABSTRACT A method and device for undulating a fabric sheet near the fell front so as not to cause the weft yarn to come into contact with the same portion of a dent. The device comprises a cross bar positioned below and in contact with the fabric sheet transversely to the same near the fell front. Rotation of the cloth roller causes an undulating motion of the cross bar so that the fabric sheet is undulated near the fell front, whereby the points of contact between the weft yarn and the dent during beating differs from time to time. In another embodiment, the cross bar is drivably coupled with the shaft of a friction roller by means of an angled rod in such a manner that rotation of the friction roller causes an undulating motion of the cross bar.
4 Claims, 3 Drawing Figures PATENTEDSEP 5:912 3588.808
INVENTOR YAS tM/ gl (/E/l/IEH ATTORNEYS METHOD OF PREVENTING A DENT FROM BEING DAMAGED BY A WEFT YARN DURING BEATING AND THE DEVICE FOR ACCOMPLISI-IING THE SAME This invention relates to the beating of a weft yarn and more particularly to a method of preventing a dent from being damaged by the weft yarn during beating and the device for accomplishing the same.
In a conventional loom, beating is effected by causing the reed to move a predetermined length of weft in its straightened state to the fell front, with the length of weft kept in contact with substantially the same portion of the dent of the reed. Thus, the dent tends to be damaged only at that particular portion contacted by the weft yarn. In case where a hard thread such as one made of polyester fiber is used as a weft yarn, the dent becomes unusuable after as short as 1,000 to 2,000 meters of cloth has been produced.
It is therefore an object of this invention to provide a new and improved method of preventing a dent from being damaged by a weft yarn during heating.
It is another object of this invention to provide a device for accomplishing the above method.
It is a further object of this invention to provide a device in which the fabric sheet is undulated near the fell front so as not to cause a weft yarn to come into contact with the same portion of the dent.
In the drawings:
FIG. 1 is a schematic view of a loom incorporating the present device;
FIG. 2 is a detailed view of the present device as shown in FIG. 1; and
FIG. 3 is a fragmentary view showing another embodiment of this invention.
Referring now to FIG. 1, there is illustrated a loom incorporating the present device. The loom has a warp beam from which a warp array 11 is drawn off to a heald 12 by way of a back rest roller 13. As is well known, the heald 12 serves to have upper and lower portions 14 and 15 of the parallel warp array 11 extending in their tensioned state so as to form a shed l6 therebetween. Provision of a shuttle or an injection nozzle (not shown) is made for inserting a predetermined length of weft 17 into the warp shed 16. The
loom also includes a reed 18 which is operated to beat the length of weft 17 so as to produce a fabric sheet 19 immediately after the length of the weft 17 has been inserted into the warp shed 16. The fabric sheet 19 thus woven is supplied through a friction roller 20 to a cloth roller 21, where the sheet 19 is wound thereon.
According to the teachings of the invention, cam means 22 is provided whose shaft 23 is drivably coupled with the shaft 24 of the cloth roller 21 by means of a belt 25. Other coupling means such as a gearing may be used. Disposed above the cam 22 is a plunger 26 mounted in a stationary bracket 27 for reciprocating movement in the vertical direction. As is best shown in FIG. 2, the plunger 26 has attached to the lower end thereof a cam follower 28 which is kept in rolling contact with the cam surface of the cam 22, so that the plunger 26 is moved up and down as the cam 22 is rotated. Attached to the other end of the plunger 26 is a cross bar 29 which extends below and in contact with the fabric sheet 19 transversely to the same over its entire breadth so as to support it at a location immediately adjacent the fell front30. Thus, rotation of the cam 22 causes an undulating motion of the fabric sheet 19 near the fell front 30. While the cross bar is shown as supporting and undulating the fabric sheet, it is to be understood that the cross bar could be replaced by a temple bar (not shown) which is directly coupled with the plunger.
In operation, the cloth roller 21 is rotated to wind the fabric product 19 thereon and simultaneously to rotate the cam 22. Rotation of the cam 22 causes the cam surface to be raised from the position represented by the solid line 31 of FIG. 2 to that of the dotted line 32. As a result, the plunger 26 having the cross bar 29 attached to the top thereof is moved upwards, lifting the fabric sheet 19 to the position represented by the dotted line 33. As the cam 22 is further rotated, on the other hand, the plunger 26 is caused to move downwards by a downward force exerted by the tensioned fabric sheet 19. Thus, the fabric sheet 19 lowers itself together with the plunger 26 up to the position as represented by the solid line 34. In this way, rotation of the cloth roller 21 results in undulation of the fabric sheet 19. Since the cross bar 29 is positioned below the fabric sheet 19 immediately adjacent the fell front 30, the fell front 30 is undulated, so that the points of contact between the weft yam l7 and the dent 35 of the reed 18 during beating differs from time to time. Therefore, there is little possibility of the dent 35 being damaged only at that particular portion contacted by the weft yarn 17 during beating.
FIG. 3 is a fragmentary schematic view showing another embodiment of this invention which is different from that of FIG. 1 in that the cross bar is moved up and down by rotation of the friction roller 20. In this preferred embodiment, the friction roller 20 has a cam 36 attached to the shaft 37 thereof. The cam 36 has a cam surface with which a cam follower 38 is kept in rolling contact. The cam follower 38 is attached to one end of an angled rod 39 pivotally mounted in a loom frame as shown at 40. The angled rod 39 has attached to the other end thereof a cross bar 41 which is positioned in a manner to extend below and in contact with the fabric sheet 19 transversely to the same immediately adjacent the fell front 30. In operation, rotation of the friction roller 20 causes a pivotal movement of the angled rod 39, so that the fabric sheet 19 is undulated by the cross bar 41 attached to the angled rod 39.
In the embodiments as shown in FIGS. 1 and2, since a downward force is applied to the cross bar by the tensioned fabric sheet, the vertical position of the cross bar is related to the rotational angle of the cam even when the cross bar is being lowered. Therefore, by modifying the shape and size of the cam it is possible to control the vertical displacement of the cross bar. Although the cross bar as shown is undulated by rotation of the cloth roller or friction roller, it is to be noted that other means for driving the cross bar for undulation can be used. In this instance, it is desirable that the cross bar is driven by such means as rotating at a relatively low speed, because the cross bar is undulated at a relatively long period.
What is claimed is:
1. A device for preventing a dent from being damaged by a weft yarn, comprising a cross bar positioned below and in contact with a fabric sheet transversely to the same and located immediately adjacent to the fell front, and means operatively connected to said cross bar for undulating the same together with the fabric sheet so as not to cause the weft yarn to come into contact with the same portion of the dent at each beat-up, said means comprising a plunger mounted in a stationary bracket for reciprocating movement in the vertical direction and having one end operatively connected to said cross bar, a cam follower attached to the other end of said plunger, a cam having a cam surface with which said cam follower is kept in rolling contact, and a driving means for causing said cam to rotate, whereby the points of contact between the dent and the weft yarn during beating differs from time'to time.
2. A device according to claim 1, in which said driving means comprises a belt for drivably coupling the shaft of a cloth roller with that of said cam.
3. A device according to claim 1, in which said drivingmeans comprises a belt for drivably coupling the shaft of a friction roller with that of said cam.
4. A device for preventing a dent from being damaged by a weft yarn, comprising a cross bar positioned below and in contact with a fabric sheet transversely to the same and located immediately adjacent to the fell front, and means operatively connected to said cross bar for undulating the same together with the fabric sheet so as not to cause the weft yarn to come into contact with the same portion of the dent at each beat-up, said means comprising an angled rod pivotally mounted in a loom frame and having one end attached to said cross bar, a cam follower attached to the other end of said angled rod, and a cam mounted on the shaft of a friction roller for rotation therewith and having a cam surface with which said cam follower is kept in rolling contact, said friction roller engaging with said fabric sheet which is supplied to a cloth roller and which is wound thereon and being slightly rotated when a beat up is completed by said dent, the cam surface of said cam being a locus of a point which moves as a distance between the point and the axis of said cam is continuously slightly varied thereby slightly undulating the fabric sheet when a beat up is completed by said dent, whereby the points of contact between the dent and the weft yarn during heating differs from time to time.

Claims (4)

1. A device for preventing a dent from being damaged by a weft yarn, comprising a cross bar positioned below and in contact with a fabric sheet transversely to the same and located immediately adjacent to the fell front, and means operatively connected to said cross bar for undulating the same together with the fabric sheet so As not to cause the weft yarn to come into contact with the same portion of the dent at each beat-up, said means comprising a plunger mounted in a stationary bracket for reciprocating movement in the vertical direction and having one end operatively connected to said cross bar, a cam follower attached to the other end of said plunger, a cam having a cam surface with which said cam follower is kept in rolling contact, and a driving means for causing said cam to rotate, whereby the points of contact between the dent and the weft yarn during beating differs from time to time.
2. A device according to claim 1, in which said driving means comprises a belt for drivably coupling the shaft of a cloth roller with that of said cam.
3. A device according to claim 1, in which said driving means comprises a belt for drivably coupling the shaft of a friction roller with that of said cam.
4. A device for preventing a dent from being damaged by a weft yarn, comprising a cross bar positioned below and in contact with a fabric sheet transversely to the same and located immediately adjacent to the fell front, and means operatively connected to said cross bar for undulating the same together with the fabric sheet so as not to cause the weft yarn to come into contact with the same portion of the dent at each beat-up, said means comprising an angled rod pivotally mounted in a loom frame and having one end attached to said cross bar, a cam follower attached to the other end of said angled rod, and a cam mounted on the shaft of a friction roller for rotation therewith and having a cam surface with which said cam follower is kept in rolling contact, said friction roller engaging with said fabric sheet which is supplied to a cloth roller and which is wound thereon and being slightly rotated when a beat up is completed by said dent, the cam surface of said cam being a locus of a point which moves as a distance between the point and the axis of said cam is continuously slightly varied thereby slightly undulating the fabric sheet when a beat up is completed by said dent, whereby the points of contact between the dent and the weft yarn during beating differs from time to time.
US98417A 1970-12-15 1970-12-15 Method of preventing a dent from being damaged by a weft yarn during beating and the device for accomplishing the same Expired - Lifetime US3688808A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6776109B2 (en) 2000-12-13 2004-08-17 Columbia Insurance Company Bow and skew control system and method
US20050081938A1 (en) * 2002-02-07 2005-04-21 Valentin Krumm Terry weaving method for creating variable loop heights and a terry loom for carrying out said method
US7717051B1 (en) 2004-08-23 2010-05-18 Card-Monroe Corp. System and method for control of the backing feed for a tufting machine
US9290874B2 (en) 2014-04-09 2016-03-22 Card-Monroe Corp. Backing material shifter for tufting machine
CN106222857A (en) * 2016-09-14 2016-12-14 南通纺织丝绸产业技术研究院 Weft yarn sinuous configuration can Electronic Design woven fabric beating-up mechanism and using method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1704455A (en) * 1928-05-09 1929-03-05 Sr Gavin Alexander Reed-moving mechanism
US3580292A (en) * 1968-06-03 1971-05-25 Elitex Zavody Textilniho Apparatus and method for positioning warp sheds

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1704455A (en) * 1928-05-09 1929-03-05 Sr Gavin Alexander Reed-moving mechanism
US3580292A (en) * 1968-06-03 1971-05-25 Elitex Zavody Textilniho Apparatus and method for positioning warp sheds

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6776109B2 (en) 2000-12-13 2004-08-17 Columbia Insurance Company Bow and skew control system and method
US6782838B1 (en) 2000-12-13 2004-08-31 Columbia Insurance Company Bow and skew control system and method
US20040173134A1 (en) * 2000-12-13 2004-09-09 Segars Jeffery W. Bow and skew control system and method
US20050081938A1 (en) * 2002-02-07 2005-04-21 Valentin Krumm Terry weaving method for creating variable loop heights and a terry loom for carrying out said method
US7011116B2 (en) * 2002-02-07 2006-03-14 Lindauer Dornier Gesellschaft Mbh Terry weaving method for creating variable loop heights and a terry loom for carrying out said method
US7717051B1 (en) 2004-08-23 2010-05-18 Card-Monroe Corp. System and method for control of the backing feed for a tufting machine
US8141506B2 (en) 2004-08-23 2012-03-27 Card-Monroe Corp. System and method for control of the backing feed for a tufting machine
US9290874B2 (en) 2014-04-09 2016-03-22 Card-Monroe Corp. Backing material shifter for tufting machine
CN106222857A (en) * 2016-09-14 2016-12-14 南通纺织丝绸产业技术研究院 Weft yarn sinuous configuration can Electronic Design woven fabric beating-up mechanism and using method thereof

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