US2553351A - Weft controlling and cutting means for shuttleless looms - Google Patents

Description

E sELo'm 553,353 WEF'T CONTROLLING AND CUTTING MEANS FOR SHUTTLELESS LOOMS Filed Sept. l1, 1946 5 Sheets-Sheec l LNVENTOR {06E/W0 @H0777 ATTO R N EYS ay B5, 195i E. BELOTTI WENT coNTRoLLING AND CUTTING MEANS FOR sHUTTLELEss Looms 5 Sheets-Sheet 2 Filed Sept. ll 1946 ATTORNEYS May l5, 1951 E. BELOTTI WENT CONTROLLING AND CUTTING MEANS FOR sHuTTLELEss Looms 5 Sheets-Sheet 5 Filed Sept. l1 1946 FiG. 5

INVENTOR V65/Wa A@bf2 077/ MM? May i5, 195i E. isn-:LOTTI WEFT CONTROLLING AND CUTTING MEANS FOR SHUTTLELESS LOOMS 5 Sheets-Sheet 4 Filed Sept. 1l 1946 ATTORN EY;

May 15, 1951 E. BELoT-rl WEFT CONTROLLING AND CUTTING MEANS Foa sHuTTLELEss Looms 5 Sheets-Sheet 5 Filed Sept. 11, 1946 INVENTOR El/Gf/V/O BEZTT/ M Patented May 15, 1951 WEFT CONTROLLING AND CUTTING MEANS FOR SHUTTLELESS LOOMS Eugenio Belotti, Sao Paulo, Brazil Application September 11, 1946, Serial No. 696,162 In Brazil April 23, 1946 6 Claims.

This invention relates to improvements in weft yarn gripping mechanism for shuttleless Weaving looms.

The primary object of the present invention is to provide an improved mechanism for controlling and cutting the weft yarn supplied to a shuttleless loom.

According to the invention, the improved mechanism for controlling the supply of weft yarn comprises a part of a shuttleless weaving loom of the type adapted to carry out a weaving process comprising the steps of inserting a weft yarn in such a way that a U is formed in the cloth for every two consecutive picks. The insertion of the weft yarn in this shape is achieved in the following manner: In one pick, With one weft length inserted and in place, additional weft yarn is taken from the yarn supply of the loom and brought into range of a special mechanical contrivance which (at the exact moment when a device for gripping and pulling the weft yarn takes hold of the latter in the centre of the loom or shed of the warp where it has been taken by a weft inserter) cuts the end of the weft yarn already partially inserted in the shed and, at the same time by means of a clamp holds or grips the severed end of the weft yarn which is still connected with the supply cone of the loom, leaving the other cut end free. The latter cut end of the weft yarn is then taken to the far side of the cloth by the weft pulling-andgripping device.

On the next pick (at the moment when the weft pulling-and-gripping device holds the weft yarn in the rcentre of the fabric or shed Where it has been carried by the weft-inserter, which, in turn, has unwound the required length of yarn from the weft yarn supply), said clamp releases or frees the end of the weft yarn which is connected with the aforementioned yarn supply. The released end of the weft yarn is taken from the inserter to the' far side of the fabric or shed by the weft pulling-and-gripping device. The first described operation is then repeated. In this way, after two consecutive picks, one piece forming two lengths of weit yarn is inserted in the cloth in the form of the letter U.

In accordance with an important feature of the invention, the improved mechanism for carrying out the weaving pro-cess as described is characterized by including a mechanically operated weft-holding device actuated by a lever and cam means, an arm movable in a sheath having on its opposite end an abutment against which the weft yarn is held, a yarn-engaging means attached to the sheath for moving the yarn into the yarn-holding means, and means on the device for cutting the yarn.

The invention includes other features, objects and advantages which will be described more in detail hereinafter in connection with the accompanying drawings forming a part of this appli-cation. In the drawings:

Fig. 1 is a side View of a part of a loom constructed in accordance with the features of the invention for holding and cutting the weft yarn, the device being shown in its open position.

Fig. 2 is a top view of the mechanism shown in Fig. 1.

Fig. 3 is a side View of the mechanism shown in Figs. 1 and 2, taken from the opposite side from that of Fig. 1.

Fig. 4 is a side view partly in dotted lines of a loom showing the position, arrangement and means for actuating the mechanism shown in Figs. 1 to 3.

Figs. 5 to l0 are respectively perspective views showing diagrammatically the positions of various elements of a loom including that of the improved mechanism having a structure of Figs. l to 4, at various stages in a weaving cycle.

The improved mechanism forming the parts of a loom for carrying out a Weaving process of the type described is shown generally in Fig. 4 and comprises a yarn-holding-and-cutting mechanism I driven mechanically by a lever 2 to which is attached a spring 3 to maintain the lever in engagement with a cam 4.

The holding-and-cutting mechanism l, shown on a larger scale in Figs. l to 3, includes a movable arm l having attached thereto a bracket 6 provided with a slot 5 by which the'arm l is connected to the lever 2. This arm moves inside a fixed sheath 8 and has on its other end a small right-angled abutment 9 which forms part of the actual weft yarn clamp of the holding device. The aforesaid cam tl performs one revolution to every four revolutions of the loom crank shaft.

On the outside of the sheath 8 are two perforated supporting blocks I0 which serve as guides for a pin H which, on the end facing the part 9, broadens out and takes the shape of a hammer head t2. This pin ll, in its cylindrical portion between the two supporting blocks I0, is enclosed by a spring I3, the purpose of which is to exert pressure on head l2 which, when bearing on the part 9, constitutes the actual clamp of the holding device.

The mechanism l includes a yarn pick-up and cutter ill, operated mechanically by a rack I5 attached to the arm 'l of the holding device, so that the rack follows the movements of said arm, which in turn actuates the yarn pick-up and cutter is by means of its pinion i8, which is fixed t0 the cutter, said pinion being mounted on the sheath 8 and engaging the rack i5.

The pick-up and cutter i has a beak-like projection I2', intended to pick up the weft yarn, raising it to a level at which it comes Within reach of parts 9 and l2 which grip the weft yarn between them. The lateral inside portion of the cutter lll has a straight edge I8 Which engages an inlaid steel blade screwed to the cutin end l 9 of the sheath 3 to effect the cutting of the weft yarn. The complete mechanism l is attached to the loom frame by means of a bracket 2S fastened to the sheath t.

The operation cf the yarn-grippingandcut ting mechanism may be briefly outlined and illustrated in connection with weaving operas tions carried out on a loom of the type under consideration, in connection with the positionshowings in Figs. 5 to l0.

At the start of the first phase of operation of the mechanism the holding device is open, and the yarn pick-up and cutter is also open and in the starting position, as shown in Figs. l to 6.

Beginning with the situation shown in Fig. 5 in which a length or end of weft yarn 24 is held in the cloth or fabric 25 being woven, this iigure shows the length of yarn as moved into place by a reed or beater 25. Fig. 6 shows a weft yarn-inserter 23 acting on a continuation of the length 24 to unwind the length of yarn required for the width of the fabric in production from the weft yarn supply or spindle 2l'. The yarninserter 23 moves into the shed of the warp 28 and is associated with: a yarn-gripping-ande pulling device 29 (Fig. '7) which moves simultaneously into the shed from the opposite side of the fabric, as indicated in Fig. 7.

At the moment the weft-inserter 23 meets the yarn-gripping-and-pulling device 29 in the center of the fabric as sho-wn in 7, the yarngripping-and-cutting mechanism l, operated by the cam 4, closes, carrying out the following movements:

The rack E5 attached to the arm l, when the latter is forced back, follows it in this move ment (Fig. 6), and turns the pinion i5, which in turn moves the yarn pick--up cutter I0, in the opposite direction, that is, forward.

The pick-up cutter lll, as it moves forward picks up with its beak-shaped projection I7 the weft yarn coming from the weft yarn supply 2'?, and raises it to the level of parts S and 2, which constitute the actual yarn holding clamp of the device. imultaneously, part 9 starts moving toward part l2, and the weft yarn, having been brought between these two parts by the cutter before the clamp has fully shut, is secured by the meeting of said parts 9 and i2, the latter of which is forced back by the pressure exerted by part s which remains pressed against part l2 by virtue of the tension given by spring I3, which tension maintains the grip which parts 9 and I2 have on the yarn.

Immediately after the yarn has been gripped by parts 5 and l2, the cutter completes its movement, and through the Contact of its straightedge inside portion E8 with the steel blade set into the end i9 of sheath ii, cuts the weft yarn (Fig. '7). The cut-off free end of this yarn 3Q is carried by the gripping-a1id-pulling device 29 to the far end of the cloth A5, and in this manner inserted therein to form the second leg of the U in the fabric, the length 213 forming the irst. The end of this operation is shown in Fig. 8. lt will be understood that after a length of weft yarn is put in place in the fabric, the warp will be shifted, for example, by a loom harness Si as in the usual weaving practice.

At the start of the second phase of operations, the gripping mechanism remains closed, and continues to hold the end of the weft yarn running to the supply 27. The weft-inserter 23, using the gripped end of this yarn as a point of application (fulcrum), unwinds from the weft yarn supply 2 the length of yarn required by the width of the cloth as it moves into the shed of the warp as seen in Fig. 9.

When the vveft-inserter 23 meets the weftpulling-and-gripping device 29 in the centre of the warp shed, as shown in Fig. l, the arm 'i of the mechanism moves forward, and opens the yarnwholding device, releasing the end of the yarn so that the now loose end 32 of the weft yarn is pulled to the other side of the fabric by the gripping-andfpulling device 29. Simultaneously, with the forward movement of arm l, the rack l5 follows this movement and by means of the pinion it, moves the pick-up and cutter i4 in the opposite direction. In addition to this, when part i3 moves away from part i2, the latter is forced to return to its original position by the pressure exerted by the spring I3. By the time the member 23 starts to pull the yarn through the shed, the yarn from the supply is gripped by a yarn holder 22 so that only the section including the free end 32 is pulled through. The holder 22 is operated by a reciprocating arm or shaft shown in Figs. 4 and 5. After this the mechanism is again in position to go through .all the movements previously described and repeat the respective operations.

The operations and motions for two consecutive picks involved in forming a weft yarn U in a fabric are described in chronological order, starting with the apparatus in the position shown in Fig. 8, with the end of the yarn from the supply gripped by the elements 9 and l.

rst pick (0) The harnesses 3l are still changing their positions and the reed beats up the weft yarn, (l) A fork 2| in Figs. 5 to 10 which brings the weft yarn into reach of the weft-inserter 23, begins its down stroke. The weft yarn holder 22 begins to open. The yarn-inserter and the gripping-and-pulling device start their move.- ment towardv the shed and the harnesses are still changing their positions. The lay begins its backward movement.

(2) The fork 2i ends its down stroke and the inserter and the gripping-and-pulling device continue their movement towards the shed, while the weft yarn holder 22 opens fully. At the same time, the harnesses complete their change of positions, opening the shed, while the lay is still receding.

(3) The Weft-inserter takes hold of the weft yarn.

(Il) The inserter and the gripping-and-pulling` device enter the shed.

(5) The fork 2| begins its return to its original position (raised) and the inserter and the gripping-and-pulling device penetrate further into the shed, being, at this moment, at the begin-,-

ning of the cloth. Meanwhile thel lay is still receding.

(6) The fork 2| releases the weft yarn and continues toward its original position, while the weft yarn holder 22 begins to close.

(7) The fork 2I has returned to its original position (raised) and the weft yarn holder 22 continues to close.

(8) The inserter and the pulling-and-gripping device meet in the centre of the shed and the inserter delivers the weft yarn to the latter (Figs. 9 and 10). The lay has concluded its backward movement. The holding device 22 is finishing its down stroke in order to secure the yarn between the cone and the inserter.

(9) The inserter and the gripping-and-pulling device begin to return and the lay begins its forward movement.

(10) At the same time as (8) and (9) the yarn grip begins to open, releasing the yarn end which had been gripped in the clamp of parts 9 and I2. The holding device 22 nishes securing the yarn between the cone and the yarn inserter.

(11) The yarn-gripping-and-cutting device has opened. The inserter and the gripping-andpulling device continue their return, the latter taking along the weft yarn which it received from the inserter. The lay continues its forward movement.

(12) The harnesses begin to change their positions.

(13) The harnesses reach the same level and the inserter and the gripping-and-pulling device continue to recede, attaining the outer edges of the cloth.

(14) The harnesses continue their changing and the inserter and the gripping-and-pulling device reach their positions of point (0). The reed beats the weft yarn into the fell of the cloth.

Second pick Movements and steps (0) to (5) same as those of rst pick.

(6) The fork 2| releases the weft yarn and continues toward its original position.

(7) The fork has returned to its original position (raised). The inserter and the grippingand-pulling device advance further into the shed (Fig. 6).

(8) The inserter 23 and the gripping-andpulling device 29 meet in the centre of the shed and the inserter delivers the weft yarn to the gripping-and-pulling device (Fig. 7). At the same time the lay concludes its backward movement. The pick-up cutter I4 movin-g with the weft yarn caught on its beak I'I, raises the yarn to be cut and gripped by the holding clamp elements 9 and I2.

(9) The inserter and the gripping-and-pulling device begin to return and thelay begins its forward movement.

(10) At the same time, the pick-up cutter I4 which had already caught the yarn with its beak Il lifts the weft yarn into reach of the elements 9 and I2 of the clamp of the device, cuts the weft yarn as the clamp elements S and I2 close, their movement being synchronous to the movement of the cutter I4 to secure the end of the weft yarn connected with the supply cone.

(11) The inserter and the gripping-and-pulling device continue their return, the latter taking along the yarn which it has received from the inserter. The lay continues its advance toward the cloth.

(l2) same as in the first pick.

(13) same as in the first pick.

(14) same as in the first pick.

Having now particularly described and ascertained the nature of my said invention and the manner in which same is t0 be performed, I declare that what I claim is: f

1. In a shuttleless weaving loom of the type in which mechanism is provided for moving weft yarn through the shed of the fabric being woven and for gripping the weft yarn adjacent one edge of the fabric, an improved weft-yarn gripping mechanism comprising an arm carried by the frame of the loom and having on one end a clamping member, a second clamping member carried by the loom adjacent the clamping member of the arm, spring means for urging the second member to a predetermined position, the arm being movable endwise to move its clamping member into engagement with the second clamping member in opposition to the spring means, a lever attached to the end of the arm opposite its clamping member, and mechanism including a cam engaging the lever and arranged to effect the reciprocation of the arm.

2. A loom as defined by claim 1 in which the arm and lever are arranged to move the clamping member on the arm into engagement with the second clamping member only upon alternate actuations of the mechanism for moving the weft yarn through the shed of the fabric being Woven.

3. A loom as dened by claim 1 in which said second clamping member includes a head carried on a pin, and a spring on the pin arranged to urge the head toward the clamping member on the arm.

4. A loom as defined by claim 1 characterized by including a yarn pick-up and cutter device mounted adjacent the arm and the second clamping member, and means for actuating the device by movement of the arm, the arrangement being such that movement of the arm to close the gripping mechanism actuates the device to pick up yarn, move it to a position between the clamping members and then cut the yarn.

5. A loom as claimed in claim 1 characterized by including a yarn pick-up and cutter device mounted adjacent the arm and the second clamping member, an actuating pinion carried by the device, and a rack carried by the arm meshing with the pinion, the arrangement being such that the movement of the arm to close the gripping mechanism actuates the device through the rack and pinion to pick up yarn, to move it to a position between the clamping members and then cut the yarn.

6. In a shuttleless weaving loom of the type in which mechanism is provided for moving weft yarn through the shed of the fabric being woven on the loom and for gripping the weft yarn adjacent the weft yarn inserting edge of the fabric, an improved weft yarn gripping mechanism comprising a supporting guide member secured in xed position on the frame of the loom, a clamping member carried by the guide member at a position adjacent that where the weft is inserted in the shed of the fabric being woven on the loom, an arm carried and guided by the guide member and having on one end thereof a clamping member adjacent to the clamping member carried by the guide, the arm being movable endwise in the guide member to move its clampingV 7 determined synchronization with the mechanism UNITED STATES PATENTS for moving the weft yarn through the shed of the Number Name Date fabric being woven on the 100m. 681,004 Skinner Aug 20,1901 l1,678,100 Baldwin r July 24, 19'28 EUGENIO BELOTTI. 6 1,805,046 Menschner May 12, 1931 V'1,883,354 Dreyfus Oct. 18, 1932 REFERENCES CITED 1,943,662 Emery Jan. 16, 1934 2 l n Y j The following references are of record in the Zggggg ge J) 251,

me 0f this 'Patenti 1 2,407,773 Fletcher sept. 17, 1946

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