US3911968A

US3911968A - Devices for fluid insertion of filling yarns

Info

Publication number: US3911968A
Application number: US480291A
Authority: US
Inventors: Hans Zollinger
Original assignee: Maschinenfabrik Rueti AG
Current assignee: Ruti Machinery Works Ltd; Maschinenfabrik Rueti AG
Priority date: 1973-06-20
Filing date: 1974-06-17
Publication date: 1975-10-14
Anticipated expiration: 1992-10-14
Also published as: CS171287B2; CH554434A; JPS5020069A; GB1443260A; DE2420368A1; SU634680A3

Abstract

The present invention relates to devices for a loom for inserting filling yarns by means of a fluid, the loom having a reed for the beating-up of the filling yarn which has just been inserted, the devices for the insertion of the filling yarns having a comb of parallel channel-forming blades that form a guide channel for the fluid, and the channel-forming blades each having a recess which corresponds to the cross-section of the guide channel and has an outlet opening which faces the place of the beating-up of the filling yarn.

Description

United States Patent Zollinger Oct. 14, 1975 [54] DEVICES FOR FLUID INSERTION OF 2,793,658 5/1957 Dunham 1. 139/191 FILLING YARNS 3,139,] 18 6/1964 Svaty et al. 139/127 [75] Inventor: Hans Zollinger, Tann-Ruti,

Switzerland Primary ExaminerHenry S. Jaudon 73 Assignee: Ruti Machinery Works Ltd., Zurich, Mom, or firm-Donald Demo Switzerland 22 Filed: June 17, 1974 ABSIRACT [21] App]. No.: 480,291

The present invention relates to devices for a 100m for [30] Foreign Application Priority Data inserting filling yarns by means of a fluid, the loom having a reed for the beating-up of the filling yarn June 20, 1973 Switzerland 8938/73 which has j been inserted, the devices for the inser tion of the filling yarns having a comb of parallel 2% 139/ 5835 2432 channel-forming blades that form a guide channel for i 123 127 R the fluid, and the channel-forming blades each having 1 m 0 are P 188 a recess which corresponds to the cross-section of the guide channel and has an outlet opening which faces References Cited the place of the beating-up of the filling yarn.

UNITED STATES PATENTS 8/1955 Turner 139/191 7 Claims, 2 Drawing Figures U,s. Patent oct.14,1975 sheet 1 on 3,911,968

US. Patent Oct. 14, 1975 Sheet2of2 3,911,968

DEVICES FOR FLUID INSERTION OF FILLING YARNS BACKGROUND In known looms of this type, the channel-forming blades are firmly connected to the lay in such a manner that during the beating-up movement of the lay they emerge completely from the shed in order to permit the reed to beat-up the filling thread which was previously inserted and upon the following rearward movement of the lay again move between warp yarns in order, upon the next insertion of the filling yarn, to assure the desired guide within the shed of the fluid serving for the insertion of the filling yarn. The outlet opening of the recess of each channel-forming blade must, in this connection, be so directed that the filling thread which has been inserted in each case automatically slips out through this opening when the channel-forming blades are moved out of the shed. This means that the outlet opening substantially faces away from the place of the beating-up of the filling thread and faces the reed. The introduction of the channel-forming blades between warp yarns after each beating-up of the filling thread is not an easy matter, since at times a warp yarn can remain caught on a channel-forming blade or even enter into the recess thereof, which leads to defects in weaving.

in other known power looms having devices for introducing the filling yarns by means of compressed air, the teeth of the reeds themselves are developed as channelforming blades, each having a recess to form a guide channel for the stream of air serving for the insertion of the filling yarn. The recess of each channel-forming blade is, in this connection, so developed and arranged that the filling yarn which has been inserted remains in each case in the guide channel during the beating-up and emerges from the guide channel only upon the following rearward movement of the lay. For this, it is necessary to provide the recess of each blade with an outlet opening facing the beating-up point of the filling yarn. In the case of this solution, the channel-forming blades do not emerge out of the shed and then enter again between warp yarns, for which reason the above described disadvantage of the known looms is avoided. On the other hand, in connection with the second type of known looms, it is noted that the reed and channelforming blades in their beating-up position have portions which extend forward beyond the point of beating'up, said portion defining the recess which receives the filling yarn. The said forward extending portions in their turn have the result that the stretchers necessary to obtain a proper fabric cannot be arranged at a sufficiently small distance from the place of beating-up of the filling yarn. This has the result that the fabric shrinks somewhat in width at the beating-up point and the warp yarns therefore no longer extend parallel at the edge portions of the reed.

lt has been attempted to adapt the development of the stretchers and of the recesses of the blades which form the air guide channels to each other in such a manner that upon the beating-up of the reed, the stretchers dip into the guide channel. This however results in an unfavorably large cross-section of the air guide channel at least in the region of the stretchers and in a special design of the stretchers which is less effective.

SUMMARY The main object of the present invention is to develop a loom of the aforementioned type, in order to avoid the above described disadvantages of known embodiments, in such a manner and relatively simple fashion that it does not require either special warpyarn entering and exiting channel-forming blades nor special stretchers in order to be able to maintain a desirably small distance between the point of beating-up of the filling yarn and the stretchers of customary development, and that the cross-section of the guide channels formed by the channel-forming blades can be developed without regard to the stretchers.

This object is achieved in accordance with the invention in the loom of the aforementioned type essentially in the manner that the channel-forming blades engage between teeth of the reed and are so movably arranged and controlled with respect to the reed that upon the beating-up movement of the reed the channel-forming blades move less far towards the beating-up point of the filling yarn than the teeth of the lay, the latter moving at least up to the outlet openings of the channelforming blades and pushing the filling yarn which has been previously introduced into the guide channel out of the guide channel before the filling yarn is beatenup.

With this development of the loom, the channelforming blades are not in front of the teeth of the lay at the moment that the filling yarn is beaten-up, for which reason the stretchers can be arranged without difficulty at a sufficiently small distance apart in front of the place of the beating-up of the filling. The stretchers upon the beating-up do not enter into the guide channel for the fluid serving for the insertion of the filling yarn so that the cross-section of the guide channel can be selected in the most suitable shape and size without regard to the construction of the stretchers so that specially developed stretchers are not required. The channel-forming blades need not be moved out of the web before the beating-up of a filling yarn and therefore need not be introduced and be moved between the warp yarns but can remain continuously between the warp yarns, like the teeth of the lay.

The channel-forming blades are advisedly held by at least one ledge which extends on the side of the reed which faces away from the fell of the cloth. For the holding of the channel-forming blades there are preferably employed two parallel ledges between which the warp yarns extend and the shed is located.

In one advantageous embodiment a ledge which holds the channel-forming blades is fastened to supporting arms which are pivotally connected to the lay and means are provided for deriving a predetermined swinging movement of the supporting arms from the movement of the lay. In this connection the supporting arms can be seated on a shaft which is supported on the lay and on which there is furthermore fastened at least one link arm which has a part which engages in a fixed slotted link. In this connection the slotted link has a course which deviates from an arcuate path around the axis of swing of the lay swords in order to impart the channelforming blades the desired movement with respect to the reed.

As a further development, the channel-forming blades may each have a linear edge portion on the edge thereof, which continues from the outlet opening, and

' be controlled in movement with respect to the reed in such a manner that upon the beating-up movement of the reed the recess of each channel-forming blade moves out of the shed and the said linear edge portion of each channel-forming blade comes to lie behind the filling yarn which was previously inserted. In this connection there may be particularly advantageous an arrangement of such a nature that in the beating-up position of the reed the said linear edge portions of the channel-forming blades lie in a common plane with the beating-up edges of the reed teeth and accordingly also contribute to the beating-up of the filling yarn. Particularly in the last mentioned development, it is advantageous to arrange the channel-forming blades and the teeth of the reed alternately so that a channel-forming blade follows each tooth of the reed.

BRIEF DESCRIPTION OF THE DRAWINGS Further details of the invention will become evident from the following description of an illustrative embodiment and from the corresponding drawings which merely illustrate the subject matter of the invention, in which:

FIG. 1 shows a view in partial vertical section along the warp yarns of the parts of a loom of importance for the present invention, the moving parts being shown in the position in which they are upon the insertion of the filling yarn; and

FIG. 2 is a similar view in partial vertical section in which, however, the moving parts are shown in the position occupied by them during the beating-up of the filling yarn.

DESCRIPTION OF PREFERRED EMBODIMENT The loom shown in FIGS. 1 and 2 has a lay 11 which bears a reed 12 having linearly extending teeth 13. The lay 11 is supported by lay swords 14 on a shaft 15 which is supported in the stand (not shown) of the loom and permits of the swinging of the lay swords 14 around a pivot 16. On the lay swords 14 there is rotatably supported a shaft 17 which extends parallel to the lay 11 and on which there acts one end of each of two lay connecting rods 18. The other end of these connecting rods 18 is connected in known manner (not shown) with an eccentric or a crank with the main shaft of the loom so that, upon the rotation of the main shaft, the lay 11 moves back and forth.

Between the teeth 13 of the reed 12 there are passed in customary fashion warp yarns 20 which together with the filling yarns (not shown) form the desired cloth 21. A shed 22 between an upper group of warp yarns and a lower group of warp yarns, which is necessary for the insertion of the filling yarns, is formed in known manner by means of harnesses (not shown). The beating-up of the filling yarn which has been previously inserted is effected at the beating-up point 23 by means of the teeth 13 of the reed, as is generally known. A slight distance from the beating-up point 23, there are located stretchers 24 of customary construction which grasp the edge portions of the resultant cloth 21 and continuously pull it towards the outside in order to stretch the cloth widthwise so that the warp yarns 20 of the upper group of warp yarns and of the lower groups of warp yarns extend in parallel towards the beating-up point 23.

It will be appreciated that the development of the loom which has been described above is entirely conventional, so that it is unnecessary to go into further detail. The novel feature of the device used on the loom shown consists in the following:

Parallel to the teeth 13 of the reed 12 there are provided channel-forming blades 25 each of which engages between two reed teeth 13. The reed teeth 13 and channel-forming blades 25 can be arranged one after the other. Advantageously, the device may be provided with fewer channel-forming blades than reed teeth, for instance in the manner that every five successive reed teeth are followed by one channel-forming blade. The channel-forming blades 25 each has a recess 26 with an outlet opening 27 which is directed towards the beating-up point 23 of the filling yarn. All recesses 26 of the channel-forming blades 25 together form a guide channel for a fluid serving for the insertion of the filling yarns, for instance compressed air. The said fluid is fed by means of a main nozzle located on the shed side and a plurality of auxiliary nozzles 28 which are fed via hoses 29, the fluid being supplied from a fluid source 29A. The auxiliary nozzles 28 are arranged vertically at suitable distances apart along the lay 11 and fastened to the lay. The outlet openings of the nozzles 28 are so directed that a stream of fluid is produced in the guide channel formed by the recesses 26 of the channel-forming blades 25 transversely through the shed 22 when the nozzles are placed in operation. Directly above the opening 27 of recess 26, each channelforming blade 25 has a linearly extending edge portion 30.

The channel-forming blades 25 are not parts of the reed 12 but are held independently of the reed on a lower ledge 31 and an upper ledge 32, the two of which extend parallel to the lay 11 and are arranged on the side of the reed 12 facing away from the beating-up point 23. The lower ledge 31 is clamped in a beam which is supported by means of two or more supporting arms 34 on the aforementioned shaft 17. The

ledges

31 and 32 are a sufficient distance apart for the warp yarns which form the shed 22 to pass through between them. The shape of each channel-forming blade 25 is essentially similar to that of a crescent whose convex edge faces the beating-up point 23 and has the recess26 as well as the linearly extending portion 30.

By the swinging of the supporting arms 34 by means of the shaft 17, the channel-forming blades 25 can be moved with respect to the reed 12. In order to produce this movement, there is provided at least one link arm 35 fastened to the shaft 17 and a link guide 36 arranged stationary in the loom frame and into which a roller 37 rotatably supported on the free end of the link arm 35 engages. The link guide 36 has a path 39 which differs from a circular path 38 around the axis of swing of the lay swords 14 in such a manner that upon the beatingup movement of the lay II the channel-forming blades 25 move less far, i.e. by a smaller distance, towards the filling yarn beating-up point 23 than do the teeth 13 of the reed 11. In other words, this means that during the beating-up motion of the lay 11, the teeth 13 of the reed 12 move forward towards the beating-up point 23 relative to the channel-forming blades 25. During the rearward movement of the lay 11, the channel-forming blades 25 move less far so that they carry out a relative movement in direction towards the beating-up point 23 relative to the teeth 13 of the reed 12.

In FIG. 1, the lay 11 is in its rear dead-center position, i.e. at its greatest possible distance from the beating-up point 23 ofthe filling yarn The channel-forming blades 25 extend between the teeth 13 of the reed 12 to such an extent that the entire recess 26 of each channel-forming blade is located on the front side of the reed 12 facing the beating-up point 23. With the parts in this position, a filling yarn is inserted by means of the fluid flowing through the main nozzle and the auxiliary nozzles 28 into the guide channel which is formed by the recesses 26.

During the following forward movement of the lay 11 into the beating-up position shown in FIG. 2, the shaft 17 is turned by the link guide 36, the roller 37 and the link arm 35 in such a manner that the supporting arms 34 and the channel-forming blades 25 are swung slightly to the left as seen in the figures with reference to the reed 12, which has the result that the channelforming blades 25 move less rapidly and therefore over a smaller distance towards the beating-up point 23. The filling yarn which was previously inserted is therefore pushed by means of the teeth 13 of the reed 12 out of the guide channel formed by the recesses 26 and through the outlet openings 27 and beaten-up in customary manner onto the cloth 21 which has already been produced.

From FIG. 2 it can be noted that during the movements of the channel-forming blades 25 which have been described there also takes place a slight downward displacement with respect to the shed 22, the linearly extending edge portion 30 of each channelforming blade coming to lie behind the previously inserted filling yarn, since the latter must, after all, remain in the shed. Accordingly, the linearly edged portions 30 also contribute towards the beating-up of the filling yarn. This action is obtained in particular when care is taken to see to it that when the reed 12 is in the beating-up position the linear edge portions 30 of the channel-forming blades 25 lie in the same plane as the beating-up edges ofthe reed teeth 13. In FIG. 2, for the sake of greater clarity, the channel-forming blades 25 have been shown moved back slightly further so that the linear edge portions 30 of the channel-forming blades are removed a small distance from the beatingup point 23. This solution is selected when a highly precise adjustment of the channel-forming blades 25 and- /or of the means serving for their drive is not necessary and can therefore be avoided.

When, after the beating-up of the filling yarn, the lay 11 moves back again into its initial position shown in FIG. 1, the channel-forming blades 25 are then moved again forward relative to the teeth 13 of the reed 12 until the guide channel formed by the recess 26 for the fluid which serves for the insertion of the filling yarn is completely on the front side or beating-up side of the reed.

It is clear that with the device described, the channel forming blades 25 continuously remain between the warp yarns but periodically carry out a forward and backward movement with respect to the teeth 13 of the reed 12 in such a manner that upon the insertion of each filling yarn the guide channel formed by the recess 26 of the channel-forming blades for the fluid serving for the insertion of the filling yarn lies on the beating-up side ofthe reed l2 and then upon the beating-up of the filling yarn the channel-forming blades 25 move back relative to the reed 12 in order to enable the reed to beat-up in conventional manner. The stretchers 24 can therefore be arranged at an advantageously small distance in front of the beating-up point 23 without thereby entering into conflict with the channel-forming blades 25.

It will be appreciated that means other than those shown could be provided for driving the channelforming blades 25 with respect to the reed 12.

It will be appreciated further that various changes and modifications may be made within the skill of the art without departing from the spirit and scope of the invention illustrated and described herein.

What is claimed is:

l. Loom having a device for the insertion of filling yarns by means of a fluid, having a reed mounted on and swinging back and forth with a lay for beating-up of the filling yarn, comprising a comb of parallel channel-forming blades defining a guide channel therein for fluid insertion of the filling yarn, the channel-forming blades extending fully through the warp threads at all times and each having a recess corresponding to the cross-section of the guide channel, each said recess having an outlet opening which faces the beating-up line of the filling yarns, each of the channel-forming blades engaging between teeth of the reed and being mounted on the lay swords and swingable therewith and controlled by a guiding means with respect to the movement of the reed in such a manner that upon the beating-up movement of the reed the channel-forming blades move a smaller distance towards the filling yarn beating-up point than the teeth of the reed, the latter moving at least up to the outlet openings of the channel-forming blades and pushing the filling yarn previously inserted into the guide channel before the beating-up of said yarn out of the guide channel.

2. Loom having a device according to claim 1 in which the channel-forming blades are held by two parallel support ledges between which the warp yarns pass and in which the lower support ledge extends on the side of the reed facing away from the beating-up line.

3. Loom having a device according to claim 2 in which a ledge that holds the channel-forming blades in position is fastened to supporting arms which are swingably connected to the lay, said supporting arms are operatively seated on a shaft supported on the lay, to which shaft there is furthermore operatively connected at least one link arm, a part thereof cooperating with a fixed guide, said guide having a course which differs from an arcuate path provided by the axis of swing of the lay swords so as to impart to the channel-forming blades a movement with respect to the reed.

4. Loom having a device according to claim 2 in which the channel-forming blades have approximately the shape of a crescent whose convex edge forms a recess that is faced towards the filling yarn beating-up point.

5. Loom having a device according to claim 4 in which the channel-forming blades each has a linear edge portion continuing from the outlet opening and is controlled in movement with respect to the reed by a guiding means in such a manner that, upon the beatingup movement of the reed, the linear edge portion of each channel-forming blade comes to lie behind the filling yarn which has been previously inserted in the shed.

6. Loom having a device according to claim 5 in which in the beating-up position of the reed, the linear edge portions of the channel-forming blades lie in the same plane as the beatingup edges of the reed teeth.

7. Loom having a device according to claim 1 in which the channel-forming blades and the teeth of the reed alternate one after the other.

Claims

1. Loom having a device for the insertion of filling yarns by means of a fluid, having a reed mounted on and swinging back and forth with a lay for beating-up of the filling yarn, comprising a comb of parallel channel-forming blades defining a guide channel therein for fluid insertion of the filling yarn, the channelforming blades extending fully through the warp threads at all times and each having a recess corresponding to the cross-section of the guide channel, each said recess having an outlet opening which faces the beating-up line of the filling yarns, each of the channel-forming blades engaging between teeth of the reed and being mounted on the lay swords and swingable therewith and controlled by a guiding means with respect to the movement of the reed in such a manner that upon the beating-up movement of the reed the channel-forming blades move a smaller distance towards the filling yarn beating-up point than the teeth of the reed, the latter moving at least up to the outlet openings of the channelforming blades and pushing the filling yarn previously inserted into the guide channel before the beating-up of said yarn out of the guide channel.

5. Loom having a device according to claim 4 in which the channel-forming blades each has a linear edge portion continuing from the outlet opening and is controlled in movement with respect to the reed by a guiding means in such a manner that, upon the beating-up movement of the reed, the linear edge portion of each channel-forming blade comes to lie behind the filling yarn which has been previously inserted in the shed.