US3430665A - Weft thread holding arrangement - Google Patents

Weft thread holding arrangement Download PDF

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Publication number
US3430665A
US3430665A US669922A US3430665DA US3430665A US 3430665 A US3430665 A US 3430665A US 669922 A US669922 A US 669922A US 3430665D A US3430665D A US 3430665DA US 3430665 A US3430665 A US 3430665A
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United States
Prior art keywords
weft
weft thread
slay
face
control means
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Expired - Lifetime
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US669922A
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English (en)
Inventor
Rudolf Jager
Helmut Macho
Rudolf Zwiener
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Saurer AG
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Adolph Saurer AG
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    • 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
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/24—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick by gripper or dummy shuttle
    • 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

Definitions

  • the present invention is an improvement of looms of the type in which a weft inserting member without a bob-bin inserts measured lengths of weft threads into the warp sheds.
  • suction nozzles are provided which enter the warp shed upon approach of the weft inserting member, and are retracted from the warp shed after aspiring the weft thread released by the Weft inserting member.
  • This construction has the dis advantage that the suction is insufficient to maintain all kinds of weft threads in straight and stretched position.
  • the US. Patent 3,050,088 discloses a loom of this type.
  • Another object of the invention is to provide control means for transferring the weft thread ends released by the weft inserting member to stationary suction nozzles provided adjacent the selvedges of the woven fabric.
  • the present invention provides a weft control means of either side of the woven fabric and mounted on the slay.
  • the weft thread on one face of the weft inserting member is engaged by the control means which is operated to slide the weft thread to an adjacent face of the slay where the weft thread is clamped.
  • the weft control means is moved by the slay into the proximity of a suction nozzle, and releases the gripped weft thread end portion which is sucked in and held by the suction nozzle so that the weft thread end cannot be dragged by the next follow- "ice ing weft thread into a warp shed when the weft inserting member is picked in the opposite direction.
  • the fabric is woven in this manner, short end portions of the weft thread project from the selvedges after being released by the suction nozzle, and these Weft thread ends can be cut off in the loom, or later.
  • the engaging portion of the weft control means is advantageous to construct the engaging portion of the weft control means as a brush or as a resilient strip, which may consist of rubber.
  • One embodiment of the invention comprises a slay having face means, weft inserting means reciprocable on the slay between two end positions for inserting weft threads into warp sheds and having face means forming in the end positions of the weft inserting means, continuations of the face means of the slay, weft control means are mounted on the slay for movement between an engaging position located opposite the face means of the weft inserting means in the end position of the same for engaging a Weft thread end portion thereon held. by said weft inserting means, and a gripping position located opposite the face means of the slay for clamping the weft end portion released by the weft inserting means.
  • the weft thread end portion is moved by the same to slide from the face means of the weft inserting means to the face means of the slay.
  • Operating means are provided for moving the weft control means between the engaging and clamping positions, and for finally moving the weft control means to a releasing position when the slay approaches its front dead center position in which the reed beats the weft thread into the fell of the fabric.
  • suction nozzle means are provided so that the weft thread end portion is released by the weft control means in the proximity of the suction nozzle means which aspires and holds the weft thread end portion, while the weft inserting means begins its return travel through the next following warp shed for inserting the next weft thread.
  • FIGS. 1 to 6 are fragmentary schematic plan views illustrating successive operational positions of a loom according to the prior art which may be improved by the construction of the present invention
  • FIG. 7 is a fragmentary schematic plan view illustrating the loom of FIGS. 1 to 6 provided with the weft thread holding arrangement according to the invention, and in an operational position corresponding to FIG. 6;
  • FIG. 8 is a fragmentary schematic plan view of the loom in an operational position following the position of FIG. 7;
  • FIG. 9 is a fragmentary plan view on an enlarged scale illustrating a portion of the weft inserting means cooperating with the weft control means of the invention in the operational position of FIG. 8;
  • FIG. 10 is a schematic side elevation illustrating a weft thread holding arrangement according to the invention.
  • FIG. 11 is an elevation on an enlarged scale illustrating a portion of the apparatus shown in FIG. 10 with the weft inserting means and weft control means in the engaging position shown in FIG. 9;
  • FIG. 12 is an elevation on an enlarged scale, corresponding to FIG. 11, but illustrating another operational position of the apparatus in which the weft thread end is transferred to a suction nozzle;
  • FIG. 13 is a fragmentary plan view illustrating a modified construction of the weft control means of the invention.
  • FIGS. 1 to 6 which illustrate a known loom without the weft thread holding arrangement of the invention, warps are woven into a fabric 5a together with weft threads carried through the warp sheds by a weft inserting means having gripping means 11 at both ends for gripping the weft threads during opposite picks.
  • a thread package 1 supplies the weft thread 9 which passes through eyes 7 and 8 of a rocking lever 2 which is mounted for angular movement about a stationary pivot means 2a.
  • a stationary gripping member 4 cooperates with a movable gripping member 4a which in the position shown on the right side of FIG. 1 presses the weft thread against clamping member 4.
  • Measuring drums 3 are mounted for rotation on the stationary frame of the machine and are provided with clamping and cutting means 6. As shown in FIGS. 1 to 6, rocking levers 2 swing back and forth between measuring drum 3 and a position located between gripping means 4, 4a and the fabric, and the eyes 7 and 8 guide the weft thread 9 drawn off the supply packages 1.
  • the weft inserting means 10 is located on the right side of the fabric in one end position.
  • the weft thread 9 is guided from supply package 1 through eyes 7 and 8 into the proximity of the measuring drum 3 where it is held in a loop by the clamping means 6.
  • the length of the weft thread forming the loop corresponds to the width of the woven fabric.
  • Rocking lever 2 is about to start an angular movement in the direction of the arrow from the measuring drum 3, which is at a standstill, toward gripping means 4, 4a, and FIG. 2 shows rocking arm 2 in its inner position.
  • Weft inserting means 10 has arrived in its left end position.
  • an additional section 9b of the weft thread is drawn from supply package 1 since loop 9a is still clamped to the measuring drum 3.
  • the movable gripping means 4a has moved to a gripping position holding the length of weft thread consisting of portions 9a and At this moment clamping means 6 of measuring drum 3 are opened, and the weft inserting means 10 engages the weft thread by the gripping portion 11 and inserts the weft thread during the following pick toward the right into the warp shed, as shown in FIG. 3.
  • the part of the weft thread located between gripping means 4, 4a and the selvedge of the fabric is not inserted so that the inserted weft length is less than portions 9a and 9b together.
  • rocking lever 2 swings back from clamping means 4, 4a toward measuring drum 3, as shown in FIGS. 3 and 4, and weft inserting means 10 moves into the right hand end position.
  • measuring drum 3 is counterclockwisely rotated and draws a new length of weft thread 90 from the supply package 1, winding the same in a loop.
  • the movement of rocking lever 2 toward the measuring drum 3 also withdraws additional weft thread 9b" from the supply package 1, whereupon clamping and cutting means 6 cut the weft thread and secure the end of the same on the measuring drum.
  • Weft inserting means 10 grips the weft thread by gripping means 11 and travels to the right as shown in FIG. 6 through the next shed to complete an open weft thread loop of hairpin-shape.
  • measuring drum 3 While the weft thread is introduced into the warp shed, measuring drum 3, after having stopped, rotates clockwise and measures off a new length of thread 9a, as shown in FIG. 6 so that all parts of the apparatus are in the initial position shown in FIG. 1.
  • FIG. 1 shows the start of the first stroke
  • FIG. 2 shows the start of the second stroke
  • FIG. 3 shows an intermediate position of the weft inserting means during the second stroke
  • FIG. 4 shows the start of the third stroke
  • FIG. 5 shows the start of the fourth stroke
  • FIG. 6 shows an intermediate position of the weft inserting means during the fourth stroke.
  • the weft thread holding arrangement is provided in the loom of FIGS. 1 to 4, and schematically illustrated in FIGS. 7 and 8 which correspond to FIGS. 6 and 1.
  • the supply means 1, the rocking arms 2, the measuring drums 3, and the gripping means 4, 4a are omitted in FIG. 8 for the sake of simplicity.
  • the slay 17 has a race supporting weft inserting means 10 for movement through the warp sheds between the end positions shown in FIGS. 1 and 2 located in shuttle boxes, not shown.
  • the slay has a rear dead center position shown in FIG. 7, and a front dead center position shown in FIG. 8 in which it approaches the fell 29 of the woven fabric 5a.
  • suction nozzles 34 are mounted on the frame of the machine, not shown.
  • Two weft control means 14 are secured to the slay 17 in a manner which will be explained hereinafter in greater detail, and have projecting elastic strips 16 abutting the front face 13 of the weft inserting means 10 when the same arrives in an end position, as shown in FIG. 9. Since the weft thread 9 passes over this front face, it is engaged by the weft control means 14, 16.
  • weft control means 14, 16 is moved downward, and the elastic strip 16 slides downward from face 13 of weft inserting means 10 to the front face 17a of the slay 17, taking along weft thread 9 since weft thread 9 is frictionally coupled with the elastic strips 16, and slides downward on the faces 13 and 1701 until control means 14, 16 stops and holds weft thread 9 on the face 17a of the slag 17 while the weft inserting means 10 is still moving toward the right toward the shuttle box so that it is pulled out of the gripping means 11 of the moving weft inserting means 10 and cannot follow the moving weft inserting means 10 since the end portion 12 of the weft thread which is held by elastic strip 16 gripped between front face 17a of slay 17 and the elastic strip 16 of the weft control means 14, 16.
  • FIGS. 11 and 12 of which FIG. 11 shows weft control means 14, 16 in the position of FIG. 9, the weft control means 14 has a shaft portion 14a located in a tubular sleeve 2 5a which is secured to a bracket 25 on slay 17 and has a slot 27 with a straight main portion and a partly circumferentially extending end portion 28 closed at 21.
  • the lower end of shaft portion 14a projects out of sleeve 25a and has an annular recess in which slide members at the forked ends of a double armed lever 21 are located.
  • Lever 21 is mounted on a pivot 25c supported on an arm 25b of bracket 25 so that angular movement of lever 21 causes movement of weft control means 14 with resilient strip 16 from the engaging position shown in FIG. 11 in which the resilient strip 16 abuts the front face 13 of weft inserting means in one of its end positions and holds the weft thread on the front face 13, to a lower holding position, in which strip 16 resiliently abuts the front face 17a of slay 17 to clamp weft thread 9 on face 17a.
  • lever 21 is connected by long links to a lever 19 mounted on a stationary pivot means 19a and having a cam follower roller 24 operated by a rotary cam 13 which turns in synchronism with the reciprocating movement of the slay 17 which turns about a shaft 36.
  • the rotation of cam 18 causes reciprocation of lever 21 so that weft control means 14, 16 is moved between the engaging position shown in FIG. 11, and the lower clamping position cooperating with front face 170, while pin 26 moves in the straight portion of slot 27.
  • shaft 14a is lowered to a position in which pin 26 enters the transverse portion 28 of slot 27 so that shaft 14a is turned together with elastic strip 16 whose free end moves away from front face 17a of slay 17 and releases the clamped weft thread in the position of FIG. 12.
  • the slay 17 moves from the position shown in FIGS. 10 and 11, to the position shown in FIG. 12 in which the gap formed between weft control means 14, 16 and front face 17a of slay 17 is located in the proximity of the inlet of suction nozzle 34 which is placed in the region of the fell 29 of the fabric 33. Consequently, the end 12 of the weft thread 9 is sucked into the nozzle, as shown in FIG. 12, and held in the same while the slay moves away toward its rear position and the weft inserting means 10 is provided with a new weft thread and picked from the right to the left, as explained with reference to FIGS. 4 and 5.
  • FIG. 7 shows the weft inserting means 10 moving toward the right, and when weft inserting means 10 will arrive in the right hand end position, the weft thread 9 will be engaged by the weft control means 14, 16 in the position of FIG. 9 and FIG. 11, whereupon slay 17 will move to the front position shown in FIGS.
  • weft control means 14, 16 first moves downward from the higher weft engaging position to the lower weft holding position, and then turns to the weft releasing position when the front face 17a of slay 17 is located under and in the proximity of the inlet of suction nozzle 12 which constitutes a holding means for holding the weft thread end 12 until the same is pulled out of the nozzle due to the forward movement of the fabric 5a as the same is being woven and wound up on the cloth beam, not shown.
  • the weft thread ends projecting from the selvedges of the fabric are cut off by cutting means, not shown.
  • a brush 15 replaces the resilient rubber strip 16 of the construction of FIG. 9.
  • Brush 15 and elastic strip 16 project outwardly from the selvedge and inclined at an acute angle to the vertical front face 17a of the slay, and to the corresponding vertical face 13 of the weft inserting means 10. This facilitates the engagement of weft thread 9 as the same is transported by the weft inserting means 17 into the region of the projecting portion 15 or 16 of the weft control means 14, as best seen in FIG. 9.
  • the tubular member a has diametrically located slots 27, and the shaft portion 14a has diametrically projecting pins 26 guided in slots 27.
  • the slot end portion 28 is arranged in such a circumferential direction that the weft control means turns in the direction of the arrow 32 from the weft gripping position engaging front face 17a to the weft releasing position in which the end face of the engaging portion 15 or 16 forms a gap with front face 17a, permitting the suction nozzle 34 to aspire and hold the released weft thread end.
  • FIG. 7 shows the weft inserting means 10 in an intermediate position during a pick from the left to the right while slay 17 is retracted towards the rear.
  • FIG. 8 illustrates slay 17 in a position approaching its front dead center position, and weft inserting means 10 approaching its end position and engaging with its front face 13 the end face of the engaging portion 16 of the weft control means.
  • weft control means 14, 16 will move under the suction nozzles 34, as shown in FIG. 12, and slightly turn to release the weft thread which will be sucked into the suction nozzle 34.
  • the weft thread 9 located in the preceding warp shed is being held by the clamping means 4, 40, as shown in FIG. 4.
  • Weft thread holding arrangement comprising in combination, a slay having face means; weft inserting means for releasably holding weft threads of a predetermined length and being reciprocable on said slay between two end positions for inserting weft threads into warp sheds, said weft inserting means having face means forming in said end positions substantially continuations of said face means of said slay; weft control means mounted on said slay for movement between an engaging position located opposite said face means of said weft inserting means in said end position for engaging a weft thread end portion thereon held by said weft inserting means, and a gripping position located opposite said face means on slay for gripping the weft end portion released by said weft inserting means, said weft control means sliding said weft thread end portion from said face means of said weft inserting means to said face means of said slay during movement from said engaging position to said gripping position; and operating means for moving said weft control means between said engaging and
  • weft thread holding arrangement as claimed in claim 1 wherein said face means of said weft inserting means and said face means of said slay are substantially vertical front faces located in a substantially common plane and facing toward the fabric being woven.
  • weft thread holding arrangement as claimed in claim 1 wherein said slay is reciprocable with said weft inserting means between a rear position and a front position; wherein said weft control means has a releasing position spaced from said face means of said slay; wherein said operating means operates in synchronism with said slay so as to 'move said weft control means from said gripping position to said releasing position when said slay approaches said front position whereby said weft thread end portion is released.
  • weft thread holding arrangement as claimed in claim 3 wherein said weft control means is mounted on said slay for turning movement between said gripping and releasing positions.
  • Weft thread holding arrangement as claimed in claim 3 comprising supporting means for supporting said slay; and holding means mounted on said supporting means and being located adjacent said weft control means in said front position of said slay, said holding means being operable to hold a weft thread end portion released by said weft control means in said releasing position.
  • weft thread holding arrangement as claimed in claim 1 wherein said weft control means includes yieldable brush means slidingly engaging said face means of said weft inserting means and of said slay while moving said weft thread end portion on said face means.
  • weft thread holding arrangement as claimed in claim 1 wherein said weft control means includes carrier means and resilient strip means projecting from said carrier means and slidingly engaging said face means of said weft inserting means and of said slay while moving said weft thread end portion on said face means.
  • weft thread holding arrangement as claimed in claim 1 wherein said weft control means include carrier means and elastic means projecting from said carrier outwardly and toward said face means slanted to the same and slidingly engaging said face means of said weft inserting means and of said slay while moving said weft thread end portion on said face means.
  • weft thread holding arrangement as claimed in claim 1 wherein said face means of said weft inserting means include face portions on the ends of the same; wherein said face means of said slay include face portions on the ends of the same; and wherein said weft control means includes two weft control members mounted on said slay in the regions of said face portions of the same adapted to be located outward of the selvedges of a fabric which is being woven and being alternately moved between said engaging and gn'pping positions by said operating means.
  • weft thread holding arrangement as claimed in claim 1 wherein said face means of said weft inserting means and said face means of said slay are substantially vertical front faces located in -a substantially common plane and facing toward the fabric being woven; wherein said slay is reciprocable with said weft inserting means between a rear position and a front position; wherein said weft control means has a releasing position spaced from said face means of said slay; wherein said operating means operates in synchronism with said slay so as to move said weft control means from said gripping position to said releasing position when said slay approaches said front position whereby said weft thread end portion is released; and comprising suction nozzle means for attracting and holding release weft thread end portions, and being located adjacent said weft control means in said front position of said slay; and wherein said weft control means includes carrier means and elastic means projecting from said carrier means and toward said face means and slidingly engaging said face means while moving the weft thread end portion from said face means of
  • Weft thread holding arrangement as claimed in claim 1 comprising a sleeve having an axially extending slot having a circumferentially extending end portion; wherein said carrier means is mounted in said sleeve and includes a follower pin in said slot; and wherein said operating means moves said carrier means in said sleeve in axial direction while said pin moves in said slot so that said weft control means first moves along a straight path between said engaging and gripping positions until said pin enters said circumferentially extending end portion of said slot for turning said weft control means from said clamping position to said releasing position.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Woven Fabrics (AREA)
US669922A 1966-09-28 1967-09-22 Weft thread holding arrangement Expired - Lifetime US3430665A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1403766A CH442171A (de) 1966-09-28 1966-09-28 Webmaschine

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US3430665A true US3430665A (en) 1969-03-04

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US669922A Expired - Lifetime US3430665A (en) 1966-09-28 1967-09-22 Weft thread holding arrangement

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US (1) US3430665A (ko)
AT (1) AT275441B (ko)
BE (1) BE703588A (ko)
CH (1) CH442171A (ko)
GB (1) GB1130677A (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2288803A1 (fr) * 1974-07-31 1976-05-21 Moessinger Sa Procede et dispositif de tissage avec insertion par boucle
US20080271807A1 (en) * 2006-09-07 2008-11-06 Sultex Ag Method and a stretching device for the holding of a weft thread

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2928430A (en) * 1956-09-17 1960-03-15 Draper Corp Filling control for bobbin changing loom
US3186444A (en) * 1961-02-20 1965-06-01 C A Delius & Sohne Process and an apparatus for controlling the weft threads in weaving looms
CH427684A (de) * 1964-12-10 1966-12-31 Webstuhlbau Grossenhain Veb Greiferschützen-Webmaschine mit zwei Festhaltevorrichtungen für den Anfang des einzutragenden Schussfadens
US3299912A (en) * 1963-09-12 1967-01-24 Saurer Ag Adolph Suction system for tensioning weft

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2928430A (en) * 1956-09-17 1960-03-15 Draper Corp Filling control for bobbin changing loom
US3186444A (en) * 1961-02-20 1965-06-01 C A Delius & Sohne Process and an apparatus for controlling the weft threads in weaving looms
US3299912A (en) * 1963-09-12 1967-01-24 Saurer Ag Adolph Suction system for tensioning weft
CH427684A (de) * 1964-12-10 1966-12-31 Webstuhlbau Grossenhain Veb Greiferschützen-Webmaschine mit zwei Festhaltevorrichtungen für den Anfang des einzutragenden Schussfadens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2288803A1 (fr) * 1974-07-31 1976-05-21 Moessinger Sa Procede et dispositif de tissage avec insertion par boucle
US20080271807A1 (en) * 2006-09-07 2008-11-06 Sultex Ag Method and a stretching device for the holding of a weft thread

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Publication number Publication date
AT275441B (de) 1969-10-27
BE703588A (ko) 1968-02-01
CH442171A (de) 1967-08-15
GB1130677A (en) 1968-10-16

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