CS229916B2 - Weft measuring and holding device of shutleles loom - Google Patents

Abstract

A stationary storage drum(18) is located between a picking nozzle(2) and a weft supply(25), a pic length of weft being coiled upon the drum(18) by a rotating guide(23), and the weft coils being held on the drum by catcher hooks (31a, 32a) movable into and out of auxiliary-spaced holdes(33, 34) in the drum by external levers, which carry the hooks being retracted for picking. The stationary drum(18) has no inaccessible internal mechanisms and can be relatively small. The drum(18) has a tapered portion(18b) near the weft supply(25) and a cylindrical section(18b) near the nozzle(2), each with one of the holes(33, 34).

Description

BACKGROUND OF THE INVENTION The present invention relates to a weft measuring and restraint device of a loop-free weaving loom having a weft picking device from a stock weft yarn comprising a fixed drum, a weft winding guide positioned at the peripheral surface of the fixed drum and rotatable around the peripheral surface of the fixed drum. a weaving loom for guiding the weft yarn between the air weft yarn insertion nozzle and its stock spool for winding around the peripheral surface of the solid drum.

Many types of weft measuring devices have been designed and put into practice.

A rotary drum provided with a frusto-conical portion is provided between the weft yarn feeder and its insertion nozzle with a diameter gradually tapering in the direction of the weft insertion nozzle, and a cylindrical part integral with the frusto-conical portion. In addition, the rotary drum is provided with a first engaging member disposed at the edges of the frustoconical and cylindrical portion to catch the weft yarn for at least the time of the weft picking in relation to the operating GyKlu tkdlGOYS (1). during the period, except for the weft picking, in time-adjusted relation to the loom operating cycle.

In this arrangement, the weft yarn is wound around the cylindrical portion between the first and second engaging members in the length required for each weft pick. Accordingly, the weft yarn can be pulled smoothly away from the drum during the weft shifting, and is not resisted, thereby preventing its breakage. . However, a further improvement of this device was expected, since the gripping elements and their actuating device must be arranged inside a rotating drum whose interior space is not so large. This inevitably limits the choice of dimensions and design of both said components and their actuating means. In addition, there are difficulties with their operational timing and maintenance.

SUMMARY OF THE INVENTION It is an object of the invention to overcome these difficulties by developing an improved device as described herein.

SUMMARY OF THE INVENTION The object of the present invention is to provide two orifices in the peripheral surface of the solid drum, the first of which is located farther from the air jet for inserting the weft yarn than the second in the axial direction of the solid drum. wherein two hook levers with hooks extending individually into both openings for engaging the weft yarn on the peripheral surface of the fixed drum are disposed, and two pivoting levers and two cams are arranged individually to operate both hooks in time relative to the operation of the loopless loom.

Further embodiments of the invention result from individual sub-points of the definition of its subject matter.

The novel or higher effect achieved by the invention can be seen, inter alia, in that the hooks for holding the weft yarn, as well as their actuating device, outside the fixed drum can be placed in a non-rotating drum.

The invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a front view of a preferred embodiment of a weft measuring and holding device according to the invention; Figure 2. Fig. 3 is a vertical sectional view of the device of Fig. 1; Fig. 4 is a side elevational view of the device of Fig. 1; Fig. 5 is a front elevational view of one modified embodiment of the device of the invention;

With reference to Figures 1 to 4, in which a preferred embodiment of the device according to the invention is shown, a cordless loom comprises a device 2, for example an air jet for weft insertion, carried by a holder 3 attached to the loom frame 1. The weft conductor 4 is supported by a support 5 attached to the holder 3 of the device 2 and located behind the device 2 and coaxial therewith. The weft yarn 6 is a weft yarn. The holding device, which will be discussed further, is introduced into the device 2 through the weft guide 4 and then thrown into the shed of warp yarns by air. injection system 2.

A support 9 having a bearing portion 9a is attached to the support. frame 1 of a cordless weaving machine. state, by means of a horizontally arranged support 8, which is fixed to the frame. . 1. directly by screws 7, as shown in FIG. 1. The support 9 is attached in its lower part. to the support 8 by screws 19 and nuts, so that the axis of the bearing portion 9a is aligned with the axis of the weft guide 4.

As can be seen from FIG. 2, the shaft 12 is rotatably supported in its central section within the bearing portion Sa. By means of ball bearings 11. A toothed pulley 13 is fixedly mounted on the rear section of the rotary shaft 12. A toothed belt 14 connects the toothed pulley 13 -with a drive pulley (not shown) to the rotation of the shaft 12 in accordance with the loom operation. The following explanation will refer to the case where the gear ratio or the ratio between the rotation of the shaft 12 and the operating cycle of the loom is 3: 1, in which the shaft 12 rotates three times for each operating cycle.

A support bracket 16 is rotatably mounted on the front section of the rotary shaft 12 by means of ball bearings 15 so as to be rotatable relative to the shaft 12. The drum 18 forming part of the weft retainer is immovably supported by the support bracket 16 by means of screws 17. Inside the drum. 18, a weight 18 is placed and secured to the surface of its inner wall by screws 17. The drum 18 is attached to the support bracket 16 so that the weight 19 is in the lowest position. The drum 18 is formed with an outer circumferential surface consisting of a frusto-conical portion 18a which is attached to the rear end R of the drum 18 and whose diameter gradually decreases. in the direction of the air nozzle 2, i.e. from the rear end R towards the front end F of the drum 18. The outer peripheral surface of the drum 18 further comprises a conical portion 18b which is integral with the frustoconical portion 18a and extends towards the front end F of the drum 18. The diameter of the cylindrical portion 18b is adjusted such that the length of the weft yarn 6 is wound. three times around the cylindrical portion 18b, corresponds to the length required for each pick. weft. The cylindrical portion 18b may be slightly tapered towards the front end F of the roller 18, where the weft yarn 6 wound on the drum 18 may be slightly pulled during weft shifting if the tapered surface angle relative to the horizontal is 0.5 °.

The rotating shaft 12 is formed along its axis with a longitudinal weft insertion opening 28 that is open towards the rear of the rotating shaft 12. In addition, it is screwed into a bore without reference numeral formed in the outer surface of the shaft 12, a tube 21 whose interior is in communication The tube 21 is fixed to the shaft 12 by a lock nut 22. A weft winding conductor 23 is firmly attached to the free end of the tube 21 by means of which the weft yarn 6 is fed to the frusto-conical portion 10a of the drum 18. The weft yarn 6 passes through the weft yarn 6 at its free end. Thus, the weft yarn 6 withdrawn from its supply source or spool 25 is introduced into the opening. 20 and tubes 21 after passing through the air nozzle 27. The air nozzle 27 is supported by a support 26 mounted on a support 9 and located at the rear of the rotary shaft 12 so that the axes of the air nozzle 27 and the shaft 12 are aligned with each other. Then, once the weft yarn 6 has been introduced along the weft winding guide 23 and has passed through the weft guide opening 24, it is wound around a truncated cone portion 18a and a conical portion 18b where the weft yarn 6 is captured by at least one of the hooked levers 31, 32 about another mention. Then the weft yarn 6 passes through the weft guide 4.

3 and 4, the hook levers

31, 32 are rotatably mounted on the stationary shaft 35 and provided with hooks 31a, 32a at their ends. These are positioned so that they can be inserted individually into openings 33, 34 which are provided on the frustoconical portion 18a individually adjacent to the edge of the cylindrical portion 18b and directly on it.

In this case, the openings 33, 34 penetrate or break through the wall of the drum 18. In addition, the pivoting levers 37, 33 are mounted on the stationary shaft 36 and connected at their free ends individually to the intermediate sections of the hook levers 31, 32 by means of rods 31, 40. The stationary shafts 35, 36 are firmly supported by a pair of support plates 42a, 42b. which are secured by mandrels 41 attached to the outer surface of the frame 1 of the loom. The rocker levers 37, 33 are provided with cams in their middle sections. The springs 45, 46 are arranged between the stationary pin 43 and the rocking levers 37, 38, so that the cam followers 47, 48 are individually in contact with the cams 49, 59. These are mounted stationary on a rotatable shaft 51 which is rotatably supported by a pair of support plates 42a, 42b. On rotating. a fixed pulley 52 is mounted on the shaft 51 and rotated over the toothed belt 53 by a drive pulley (not shown) such that the rotary shaft 31 is rotated once for each cycle of the loom; The cams 49, 50 are formed with high cam projections 43A, 3ΠΔ and low projections 44B, 50B. In this arrangement, when the high cam projection 49A, 56A contacts the cam followers 47, 48, the rocker levers 37, 38 rotate clockwise as shown in FIG. As a result, the hook lever 37, 38 of FIG. 4 rotates counterclockwise so that the hooks 31a, 32a are inserted into the opening 33, 34 in the drum 13. When the low cam projection 43B, 50B of the cam 49, 50 contacts the cam follower 47, 43, the hook 31a, 32a is pulled out of the opening 33, 34.

Furthermore, the method of operation of the weft holding device will be discussed,

During the loom operation, the shaft 12 rotates three times for each of its duty cycles; however, the drum 18 cannot rotate and is kept stationary due to the attraction of the weight 19. Accordingly, the tube 21 and hence the weft winding conductor 23 rotate around the periphery of the drum 18 so that the weft yarn 6 is wound around the frustoconical portion 18a of the drum 18. Then, the weft yarn 6 on the frusto-conical portion 18a slides along the bevel of the frusto-conical portion 18a under its tension and moves towards the cylindrical part 1.8b, pushing out the weft yarn 6 that was there before it.

When the operating cycle of the loom reaches the moment just before the weft picking, the high cam. projections

49A, 50A contact the cam followers 47, 48 individually, thereby contacting the individual hooks

In this state, the weft yarn 6 is caught by the hook 31a of the hook lever 31 and then by the hook 32a of the hook lever 32 after being wound three times around the cylindrical portion 18b. When the loom cycle continues, the high cam projection 49A of the cam 49 remains in contact with the cam follower 4, but the low cam projection SOB of the cam 50 is brought into contact with the cam follower thereby causing the hook 32a of the hook lever 32 to be pulled out of the opening 34. Thus, the restriction to the weft yarn 6 is removed, so that the weft yarn 6 is ejected by injection from the device 2, whereby the air injection begins immediately before the hook 32a is withdrawn. If the amount of weft yarn 6 wound on the cylindrical part. 18b, the weft yarn 6 reaches zero, the weft yarn 6 being caught by the hook 31a of the hook portion 31, thereby completing the weft picking. Considering that the weft winding conductor 23 makes one revolution during this weft picking, the weft yarn 6 is wound once around the frustoconical portion 18a on the back of the hook 31a. Immediately thereafter, the high cam projection 50A of the cam 50 is contacted with the cam follower 48 and the hook 32a of the hook lever 32 is re-inserted into the opening 34 in the drum 18. Then the cam cam 4 of the cam 43 is brought into contact. the hook 31a of the hook lever 31 is pulled out of the opening 33 in the drum 18. Then the weft yarn 6, wound around the truncated portion 13a, slides down and moves towards the cylindrical portion 18b, thereby being caught by the hook 32a of the hook lever 32.

When the weft yarn 0 is wound three times around the cylindrical portion 18b, the high cam projection 49A of the cam 49 comes into contact with the cam follower 47 and therefore the hook 31a of the hook lever 31 extends between the weft yarn section 6 wound around the frustoconical portion 18a and the weft yarn section 6 wound around the conical portion 18b to separate them from each other. Immediately thereafter, the weft picking is carried out, as already mentioned.

Giant. 5 and 6 show a modified embodiment. the weft holding device according to the invention, which is similar to the embodiment according to FIGS. 1 to 4 except for these exceptions; The aperture 34 is arranged in front of the aperture 33 in the direction where the weft yarn B is wound around the drum 18, i.e. in the direction of the arrow shown in Fig. 6. In this context, the hook 32a of the hook lever 32 is arranged to protrude into a position is located forward in relation to the position at which the hook 31a of the hook lever 31 projects. In addition, the loom operating cycle is set in this case so that during the final period of the weaving beam (not shown) the cam follower 48 moves away from the low cam. the projection SOB to the high cam projection 5DA of the cam 56, and the cam contact point 47 moves from the high cam projection 49A to the low cam projection 49B of the cam 43.

In this arrangement, the apparatus of Figures 5 and 6 operates as follows: When the loom operating cycle reaches a moment immediately before the weft shoveling, the high cam projections 49A, 50A contact individually the cam rollers 47, 4Ί and accordingly. . The hooks 31a, 32a of the hooked levers 31, 32 are inserted individually into the openings 33, 34 in the drum 18. In this state, the weft yarn 6 is caught by the hook 31a of the hooked lever 31 and then hooked 32a of the hooked lever 32. As the cycle continues, the high cam projection 49Λ of the cam 49 remains in contact with the cam follower 47, but the low cam projection 50B of the cam 50 is brought into contact with the cam follower 48 thereby causing the hook 3 ' Thus, the restriction of the weft yarn 6 is thereby removed. . so that it is ejected by means of the device 2, wherein the injection of air begins immediately before the withdrawal of the hook 32a. If the amount of weft yarn 6 wound on the cylindrical portion 18b reaches zero due to this weft pick, the weft yarn 6 is caught by the hook 31a of the hook lever 31, thereby completing the weft pick. Considering that the weft winding conductor 23 performs one turn around this weft pick, the weft yarn 6 is wound once around the frustoconical portion 18a at the rear in relation to the hook 31a.

In the stroke, the weft yarn 6 is wound around the frustoconical portion 18a twice. Then. first the high cam projection 50A of the cam 50 is brought into contact with the cam follower 48 and then in contact with the cam follower 48, then the hook 32a of the hook lever. 32 is then inserted again into the opening 34 in the drum 18. The low cam projection 49b of the cam 49 is then contacted with the cam follower 47, and then the hook 31a of the hook lever 31 is pulled out of the opening 33 in the drum 18. with the hook 31a, slides down along the narrowing of the frusto-conical portion 18a and moves to the cylindrical portion 18b to be captured therein by the hook 32a.

In this state, when the weft yarn catching action 6 has passed from the hook 31a to the hook 32a, the weft yarn 6 can be withdrawn from the drum 18 at a length corresponding to the distance between the hooks 31a and .32a because the hook 32a is positioned rearwardly relative to the hook 31a. in the direction where the weft yarn 6 is withdrawn. Therefore, when the weft hits the edge of the fabric (not shown), the weft yarn 6 on the drum 18 is appropriately pulled under the influence of the increased tension caused by the progressive movement of the weaving beam. This releases said tension. during weft hammering, thereby preventing the weft yarn 6 from breaking. Then, the weft yarn 6 is wound three times around the cylindrical portion 18b, the high cam projection 49A of the cam 49 engages the cam follower 47, and therefore the hook 31a of the hook lever 31 extends accordingly the weft yarn 6 wound individually on the frustoconical portion Fa and the cylindrical portion 18b to separate them from each other. Immediately thereafter, the weft picking is carried out, as already mentioned.

While the air nozzle 27 for inserting the weft yarn 6 has been shown and described for use to reduce the resistance when the weft yarn 6 is fed to the device according to the invention, it is obvious that it is not absolutely necessary for this and can therefore be omitted. In the case where the air nozzles 27 are not used, the introduction of the weft yarn 6 from the supply spool 25 is effected by gripping it through the front end of the wire drawn through the weft insertion opening 23 'and the pipe 21.

In order to prevent the weft yarn 6 drawn away from the drum 18 from being unnecessarily caught by the hook 32a withdrawn from the opening 34 in the drum 18 due to the so-called baling effect during. a weft shifting device, a conductor may be provided around the drum 18 to limit the movement of the weft yarn 8.

So far, only the weight 19 has been shown and described as a means for keeping the drum 18 stationary, it being understood that the drum 18 can be held stationary by arranging a piece of iron or magnet inside it and positioning the magnet outside the drum 18 in a position corresponding to Moreover, although the openings 33, 34 for receiving the hooks 31a, 32a of the hooked levers 31, 32 have been shown and described as through holes, it is understood that they may take the form of recesses or recesses or cavities.

As is apparent from the foregoing, in view of the fact that the drum 18 forming part of the device according to the invention does not rotate itself, the hook levers 31, 32 and their actuating device could be located outside the drum 18, thereby facilitating their timing and maintenance.

In addition, the improved effect achieved by the invention appears to be that the hooks 31a, 32a of the hooked levers 31, 32 are spaced apart in a direction. the circumference of the drum 18 in which a slight amount of the weft yarn 6 can be pulled out of the drum 18 during the beat-up process to release it. voltage, which effectively prevents it from breaking.

Claims (13)

CLAIMS 1. A weft measuring and restraining device of a loop-free loom having a weft picking device from a weft yarn stock comprising a fixed drum, a weft winding guide positioned at the peripheral surface of the fixed drum and rotatable around the peripheral surface of the fixed drum for guiding the weft yarn between the air nozzle for clogging it and its supply spool for winding around the peripheral surface of the fixed drum, characterized in that two openings are formed in the peripheral surface of the fixed drum (18), of which the first opening (33) is located further from the weft yarn inserting device (6) than the second opening (34) in the axial direction of the fixed drum (18), outside of which the first hook lever (31) and the second hook lever (32) are arranged and formed individually with the first a hook (31a) and a second hook (32a) that project individually to both openings (33, 34) for engaging the weft yarn (6) on the peripheral surface of the fixed drum (13), and for pivoting the two hooks (31a, 32a) in timed relation to the working cycle of the loop-free loom 38) and cams (49, 50). Weft measuring and containment device according to claim 1, characterized in that the first opening (33) is located at the rim of the fixed drum (18) between its frustoconical part (18a) and the cylindrical part (18b), while the second opening (34) is located directly on the cylindrical portion (18b), the diameter of the frustoconical portion (18a) being tapered in the direction of the air nozzle (2) for clogging the weft yarn (6), while the cylindrical portion (18b) is integral with the frustoconical portion (18a) in the weft yarn inserting device (2). Weft measuring and holding device according to claim 1, characterized in that the rigid drum (18) is mounted on a shaft (12) rotatable in relation to the duty cycle of the loop-free weaving loom and co-rotatably fixed with the shaft (12). Weft measuring and restraining device according to claim 3, characterized in that the shaft (12) is rotatably supported on a bearing part (9a) of a bracket (9) which is attached to the frame (1) of the loop-free loom and to the shaft (9). 12) a weft yarn winding wire (23) is fastened together with it. Weft measuring and holding device according to claim 4, characterized in that a weight (19) is fixed inside the fixed drum (18) to maintain it in a condition disregarding the rotation of the shaft (12). 6. The weft measuring and containment device according to claim 3, characterized in that the shaft OF THE INVENTION (12) is formed with a coaxial longitudinal bore (20) for introducing the weft yarn (6) from its stock bobbin (25) to its winding guide (23). Weft measuring and holding device according to claim 6, characterized in that a tube (21) is fixed on the outer surface of the shaft (12) in connection with the longitudinal opening (20) for passing the weft yarn (6) through the tube (20). Weft measuring and holding device according to Claim 7, characterized in that a weft yarn guide (23) for attaching the weft yarn (6) to the tube (21) on a truncated conical portion (18a) of the peripheral surface of the solid drum is attached to the tube (21). (18). Weft measuring and holding device according to claim 1, characterized in that the second opening (34) is located upstream of the first opening (33) in the direction of winding the weft yarn (6) around the peripheral surface of the solid drum (18). . Weft measuring and holding device according to claim 1, characterized in that the first hook lever (31) and the second hook lever (32) are rotatably mounted on a fixed shaft (35), their first hook (31a) and second hook (32a) are reciprocally movable relative to the peripheral surface of the fixed drum (18), in timed relation to the duty cycle of the cordless loom. Weft measuring and restraining device according to claim 10, characterized in that the first hook lever (31) and the second hook lever (32) are respectively connected at their free end to the first rocker lever (37) and the second rocker lever (38) which are rotatably mounted on a fixed shaft (36) and each provided with a first cam follower (47) and a second cam follower (48) in contact with the first cam (49) and the second cam (50) in timed relation to the working cycle of the loop-free loom wherein each of the cams (49, 50 ') is formed individually with high cam projections (49A, 50A) and low cam projections (49B, 50B) and both hooks (31a, 32a) project into the respective aperture (33, 34) after contacting the cam follower (47, 48) with the high cam projection (49A, 50A) of the respective cam (49, 50), while the individual hooks (31a, 32a) of the hook levers (31, 32) are withdrawn from the individual holes (33, 34) after contact a cam follower (47, 48) with a low cam projection (49B, 50B) of the respective cam (49, 50). Weft measuring and holding device according to claim 1, characterized in that the two openings (33, 34) are punched into the wall of the solid drum (18). 13. The weft measuring and holding device aligned with the axis of the fouling device (2) according to claims 1 to 12, characterized in that the weft yarns (6j). the axes of the shaft (12) and the fixed drum (18) are