WO1999034047A2

WO1999034047A2 - Pneumatic weaving machine with a control mechanism for auxiliary nozzles

Info

Publication number: WO1999034047A2
Application number: PCT/CZ1998/000048
Authority: WO
Inventors: Zdeněk Volanský; Josef DVOR^¿ÁK
Original assignee: Výzkumný Ústav Textiních Strojů Liberec A.S.
Priority date: 1997-12-23
Filing date: 1998-12-10
Publication date: 1999-07-08
Also published as: CZ290564B6; AU1331599A; EP1042547A2; CZ418397A3; WO1999034047A3

Abstract

The invention relates to a pneumatic weaving machine with a control mechanism for auxiliary nozzles (21) comprising a reed (3) connected by means of a batten mechanism with the main shaft (5) of the weaving machine and consisting of dents (10) fitted with teeth (17, 18) forming a direct guide channel (19) with open profile whose open section is oriented toward the beat-up section (13) with a plurality of auxiliary nozzles (21) connected to a source of compressed air and arranged, in the pick position of the reed (3), opposite, and in the beat-up position, outside, the open section of the direct guide channel (19). The auxiliary nozzles (21) are fixed on a rocking shaft (24) whose extremities are seated in rocking mechanisms (29, 30) mounted on the frame (1) of the weaving machine and coupled for motion with the main shaft (5) of the weaving machine.

Description

Pneumatic weaving machine with a control mechanism for auxiliary nozzles

Technical field

The invention relates to a pneumatic weaving machine with a control mechanism for auxiliary nozzles comprising a reed connected by means of a batten mechanism with the main shaft of the weaving machine and consisting of dents fitted with teeth forming a direct guide channel with open profile whose open section is oriented toward the beat-up section, with a plurality of auxiliary nozzles connected to a source of compressed air and arranged, in the pick position of the reed opposite, and in the beat-up position, outside, the open section of the direct guide channel

Background art

In well-known pneumatic weaving machines comprising an open pick channel consisting of gliders and oriented with its open section toward the reed (for instance in JP - V 27 290), auxiliary nozzles fixed to the batten are situated between the pick channel and the reed To permit the beat-up of the weft introduced beforehand, both the gliders of the pick channel and the auxiliary nozzles completely get out of the shed during the beat-up motion of the batten across the lower warp threads, while during the reverse motion of the batten, both the gliders of the pick channel and the auxiliary nozzles penetrate between the lower warp threads so as to ensure the air guiding required for the next introducing of the weft into the shed Consequently both the gliders of the pick channel and the auxiliary nozzles are during the beat-up in a position under a bar supporting the edge of the fabric being produced The repeated penetration of the gliders of the pick channel and of the auxiliary nozzles is not free of problems consisting in the risk for the warp thread to be caught by said gliders of the pick channel or even by said auxiliary nozzles and to remain hanging on them with ensuing defects of the fabric or of the weaving process In other well-known weaving machines fitted with devices for introducing the weft by pressure air, the auxiliary nozzles are fixed to the batten in front of the reed fitted with tooth dents forming along the whole reed length a direct guide channel with an open profile situated between the teeth and oriented with its open section toward the beat-up point of the introduced weft In this design, the introduced weft remains in the guide channel during the beat-up movement of the batten, and its beat-up into the front of the fabric in process of formation is effected directly by means of a profile section of the guide channel This has partly eliminated the drawback of the above well-known machines because the guide channel does not leave the shed and thus has eliminated the risk of catching the warp threads by one or another section of the guide channel On the other hand, it is evident that in weaving machines fitted with this type of the pick channel, the extremities of the auxiliary nozzles fitted with output orifices are situated at a relatively small distance from the lower reed dent protruding forward to the fabric front Said forward protruding reed dent and the auxiliary nozzles related in position thereto continuously move across the lower warp threads out of the shed during the beat-up movement of the batten and occupy the position under the edge of the fabric in process of formation at the beat-up moment The drawback involved consists in that the auxiliary nozzles enter the fabric edge during the beat-up movement of the batten and again during its reverse movement, thus possibly straining the warp threads and damaging the fabric Consequently, the ends of the auxiliary nozzles must be narrowed to a point with ensuing negative influence on the pressure air flow Another drawback of the arrangement of the position of the auxiliary nozzles and of the guide channel of the reed on the batten consists in that the auxiliary air streams coming from the auxiliary nozzles are influenced by the necessity of streaming around the lower protruding dent of the direct quide channel of the reed, a not negligible part of the air being dispersed without any useful effect outside this direct quide channel of the reed

To eliminate this drawback, there has been proposed a solution described in the CS AO 213 078 and concerning a weft pick channel of a pneumatic weaving machine in which the auxiliary nozzles situated in a body seated on the batten are adapted to move in said body so as to get into the open section of the pick profiles of the weft guide members of the pick channel. During the weft pick, the operating ends of the auxiliary nozzles are situated in the open section of the pick channel, and the air streaming out of these output orifices situated at said operating ends in the direction of the weft pick supports the pick of the weft through said pick channel whereupon, during the movement of the batten into the beat-up, they are retracted into the body they are seated in thus bringing their operating ends to a sufficient distance from the beat-up area and, consequently, outside the edge of the fabric in process of formation protected in this way from being damaged by them. During the reverse movement of the batten, they again go out of the body they are seated in, and their operating ends protrude back into the open section of the weft pick channel The drawback of this solution consists in considerably increased complicatedness and consequently also the mass of the batten of the weaving machine because it is necessary to install a body for seating the auxiliary nozzles and to ensure their perfect guiding in said body. Provided must be also the transmission of the batten movement to the respective control members of each auxiliary nozzle which further increases the complicatedness, the mass, and also the price of such a device. Due to inertia forces generated by the movement of the batten, the overall mass of the batten has a substantial influence on the operating speed of the weaving machine and on the necessary ruggedness of the weaving machine

The invention aims at eliminating or, at least, at minimizing the drawbacks of the state of art.

Principle of the invention

The goal of the invention is achieved by a pneumatic weaving machine with a control mechanism for auxiliary nozzles whose principle consists in that the auxiliary nozzles are fixed on a rocking shaft whose extremities are seated in rocking mechanisms mounted on the frame of the weaving machine and coupled for motion with the main shaft of the weaving machine. This arrangement, unambiguously positively defining the mutual original position of the auxiliary nozzles and of the reed, also ensures exact timing of the movements of the auxiliary nozzles and of the reed, because the movements of each of these members are derived in common from the movement of the main shaft of the weaving machine

Preferably, on the rocking shaft there is adjustably fixed one extremity of arms whose the other extremity carries a support in which the auxiliary nozzles are seated

Preferably, the rocking shaft is at least at one place between the rocking mechanisms rotatably mounted in a suspension fixed to an upper beam mounted on the frame of the weaving machine and situated above the rocking shaft

This helps to increase the stability of the rocking shaft

Preferably, each auxiliary nozzle is connected by means of a hose with an electromagnetic valve mounted on a holder fixed to the upper beam and is through a supply line connected to a source of pressure air

Preferably, the rocking mechanisms are connected with the main shaft by indented belts

Description of the drawings

An example of embodiment of the invention is schematically shown in the drawing in which Fig 1 is an axonometric view of a weaving machine with a control mechanism for auxiliary nozzles, Fig 2 is an axonometric view of the left side of the weaving machine with the control mechanism for auxiliary nozzles, Fig 3 is a cross section through a part of the weaving machine with the auxiliary nozzle and with the reed in the pick position at the plane A-A shown in Fig 1 , Fig 4 is a cross section through a part of the weaving machine with the auxiliary nozzle and with the reed in the beat-up position at the plane A-A shown in Fig 1 , Fig 5 is a cross section through the rocking shaft with the auxiliary nozzle and with slay shaft with the reed with schematically shown phases of their mutual movement Fig 6 shows the path of the relative movement of the auxiliary nozzle with respect to the reed, and Fig 7 shows the envelope defined by the relative movement of the outline of the extremity of the auxiliary nozzle with respect to the reed

Example of embodiment of the invention

A pneumatic weaving machine with a control mechanism for auxiliary nozzles shown in Figs 1 and 2 contains a frame 1_ comprising a pair of side walls 1§ and b and carrying a batten 2 The batten 2 contains housings 4 of the batten mechanism, the main shaft 5 and a slay shaft 6 arranged in parallel with it The main shaft 5 passing along the whole width of the weaving machine is mounted for rotation in the side walls la and lb of the frame and its one extremity is by means of a belt transmission 8 coupled with a torque source consisting of a not shown motor covered by a cover 9 The main shaft 5 passes through the housings 4 of the batten mechanism and forms an input member of the batten mechanism of each batten mechanism housing 4, while the output member of the batten mechanism of each batten mechanism housing is formed by the slay shaft 6, also passing through all the batten mechanism housings 4 and mounted for reversible rotation in the side walls 1 and b of the frame 1 of the weaving machine

A reed 3 comprising dents 1_0 situated side by side along the whole length of the reed 3 is mounted on the slay shaft by means of swords 7 The dents 10 of the reed 3 comprise an upper dent 17 and a lower dent 18, with a free space situated there between and forming along the whole width of the weaving machine a through direct guide channel 19 open in the direction of the beat-up section

Seated in not represented healdframes are healds through which warp threads H and 12 pass from a warp beam to a cloth beam The mutual movement of the healdframes with the healds produces a shed 15 between the warp threads H and 12 Behind the healdframes of the weaving machine in the direction of the cloth beam, the warp threads H and 12 pass between the dents 10 of the reed 3 In the area behind the reed 3, the warp threads H and 12 produce a fabric 14 in the beat-up section 3 in cooperation with a not illustrated weft Behind the beat-up section 13, the fabric 14 is situated on a supporting bar 1 and is further led on a not shown breast beam and cloth roller and is wound on the cloth beam

In the proximity of a lateral entry into the direct quide channel 19 in the dents 10 of the reed there is situated on one of its lateral walls the mouth of a mam nozzle 20 used to introduce the weft into the shed 1_5

Each of the two side walls λa and lb of the frame 1 of the weaving machine carries one of two frame brackets 27 and 28 and each of the two frame brackets carries one of two rocking mechanisms 29, 30 Each of the two rocking mechanisms 29, 30 carries one of the extremities of a rocking shaft 24 mounted rotatably therein said rocking shaft 24 forming in this way the output of the rocking mechanisms 29 and 30 Each of the rocking mechanisms 29, 30 comprises an input shaft 290 and 300 respectively, coupled for motion with its related extremity of the mam shaft 5 of the weaving machine and by means of this also with the drive of the weaving machine The extremities of the drive members of the batten 2 and of the rocking shaft 24 are interconnected by constant transmissions so that the common drive of the batten 2 and of the rocking shaft 24 designed in this way constitutes a synchronized motion system This arrangement also provides for a bilateral torque transmission from the main shaft 5 to the rocking shaft 24 thus eliminating the negative action of the twisting of the rocking shaft 24

In the example of embodiment shown in the drawing, each input shaft 290 300 of each rocking mechanism 29 30 is by means of each indented belt 3_1, 32 in drive connection with its related extremity of the mam shaft 5 In another not represented embodiment, the drive connection of each input shaft 290 300 of each rocking mechanism 29 30 with their related extremities of the mam shaft 5 is provided by another suitable means

Along the whole length of the rocking shaft 24 are fixed to it adjustably spaced apart as required by the specific technological production needs, first extremities of arms 23 whose the other extremities carry a holder 22 of auxiliary nozzles 21 arranged in a row side by side along the whole length of the holder 22 and oriented in the pick position of the reed 3 with their longitudinal axes almost into the central plane of the direct quide channel 1_9 Their extremities, fitted with output orifices 33, are situated directly in front of the open section of the direct quide channel 19 of the reed 3 In the pick position of the reed 3, the output orifice 33 of each auxiliary nozzle 21 is situated in the direction into the direct quide channel 19 in the direction of the weft movement during its pick through the direct quide channel 19 The auxiliary nozzles 2 . are mounted in the holder 22 adjustably in the direction along their longitudinal axes This positioning of the axes of the auxiliary nozzles 21 accompanied by the adjustment of the direction of their output orifices 33 permits an optimum air filling of the direct quide channel t9 during the pick

In another not represented embodiment, each arm 23 carries an independent holder 22 which in its turn carries a number of auxiliary nozzles 21 adequate to the length of the holder 22 In still another not represented embodiment, each auxiliary nozzle 2 . is mounted on a separate holder 22 seated on a separate arm 23 mounted on the rocking shaft 24

Each auxiliary nozzle 21 is in one of the well-known ways connected to a well-known not represented pressure air source and the pressure air supply to the auxiliary nozzles 21 is controlled in one of the well-known ways

In the pick position, the extremities of the auxiliary nozzles 21 are situated at an adjustable distance a (see Fig 6) from the rear wall of the direct quide channel 19 The adjustability of the distance, combined with a proper adjustment of the direction of the output orifices 33 of the auxiliary nozzles 21, permits still more to influence the filling of the direct quide channel 19 with pressure air during the weft

While moving in relation to the reed 3 the extremities of the auxiliary nozzle 21 describe a path shown in Fig 7 by an envelope o At the same time the position of the auxiliary nozzle 2 _ in relation to the reed 3 changes, as shown in the same Fig by the angle δ At a level above the rocking shaft 24, the lateral brackets 27 and 28 carry an upper beam 26 having along its whole length between the lateral brackets 27 and 28 suspensions 25 spaced apart, fixed with their first ends on the beam and holding in their opposite ends in one of the well-known ways, permitting the rotary motion the rocking shaft 24 This arrangement helps to increase the required stability of the rocking shaft 24, in particular by preventing it from sagging between the side brackets 27 and 28

The distances between the rocking shaft 24 and the lower edge of the upper beam 26 are sufficiently great to ensure appropriate attendance of the weaving machine with the control device of the auxiliary nozzles 21

In the particular example of embodiment shown in Fig 1 the rocking shaft 24 is mounted to rock in five suspensions 25 In the length section of the rocking shaft 24 between each two suspensions there is seated on the rocking shaft 24 in the above described manner a system of three arms 23 with the holder 22 of the auxiliary nozzles 21 Between each end suspension 25 and its adjoining rocking mechanism 29 or 30 the rocking shaft 24 is fitted with a pair of said arms 23

In the example of embodiment shown in the drawing, the auxiliary nozzles 21 are by means of a hose 34 entering an electromagnetic valve 35 mounted on a holder 350 fixed to the upper beam 26 in combination with a supply line 36 coupled with a pressure air container connected to a pressure air source In this example of embodiment, the pressure air container is made as a well-known air chamber 37 as illustrated in Figs 3 and 4

The weaving machine with the control mechanism for auxiliary nozzles according to the invention operates as follows

Before the weft pick, the reed 3 is situated in the pick position, the shed 15 is opened, and the lateral input of the direct quide channel 1_9 situated inside the shed 15 is oriented opposite the mouth of the main nozzle 20 Along the whole length of the direct quide channel 19 at its open side facing the beat-up section 13 there are mounted auxiliary nozzles 21 located apart and in the above stated position relative to the direct quide channel 19, as is shown in Fig 3 where these auxiliary nozzles 21 in this pick position of the reed 3 pass through the system of the upper warp threads H

The pressure air coming out of the mam nozzle 20 introduces the weft into the direct quide channel 19 At the same time, additional air, supporting the correct insertion of the weft into the shed 1_5, is led into the direct quide channel 19 from the air chambers 37 through the output orifices 33 of the auxiliary nozzles 21 After the weft has been inserted into the shed 15, the turning movement of the slay shaft 6 swings the reed 3 forward from its pick to its beat-up position, and the weft is transported in a well-known manner by the reed 3 to the beat-up section 13 and there beaten to the edge of the fabric 14 in process of formation

In synchronism with this forward swinging movement of the reed 3 the rocking shaft 24 with the auxiliary nozzles 21 turns in such a way that the auxiliary nozzles 21 recede from the forward moving reed 3 and while doing so, change also the direction of their longitudinal axes relative to the central plane of the direct quide channel 1_9 of the reed 3, as is shown in Figs 5, 6 and 7 The relative movement of the auxiliary nozzle 21 in relation to the upper dent 17 of the reed 3 schematically shown in Fig 6 shows the displacement of each auxiliary nozzle 21 upwards in relation to the reed 3 during its movement from the pick position to the beat-up position The magnitude of the angular displacement of the rocking shaft 24 is in relation to the change in the angular position of the slay shaft 6 depending on the adjustment of the rocking mechanisms 29 and 30 on the means by which the rocking shaft 24 is coupled with the main shaft 5 and on the batten mechanism of the batten 2 During this synchronized movement of said two parts with the ends of the auxiliary nozzles 21 moving along a circular arc path beginning in the weaving plane 38 (see Fig 5) and ending, in the example of embodiment shown in the drawing, at a place in front of the upper weave 39 of the reed 3 over the bar 1_6 supporting the fabric 14 the auxiliary nozzles 21 are drawn out of the system of the upper warp thrads H and the auxiliary nozzles 2J. pass along the edge of the fabric in formation at a safe distance therefrom After the beat-up, the reed 3 returns from its beat-up position to its pick position and a new shed IjS is created Simultaneously with said return movement of the reed 3 from its beat-up position to its pick position, the rocking shaft 24 as well turns back to its pick position so that the auxiliary nozzles 2J_ penetrate back into the system of upper warp threads 1_1 while mowing downward in relation to the reed 3 (see Fig 5 ) and resume with their longitudinal axes and extremities equipped with the output orifices 33 the above described pick position directly opposite the open side of the direct quide channel 1_9 of the reed 3

The above weaving cycle is then repeated

The exact synchronism in the movements of the auxiliary nozzles 21 and of the reed 3 will be achieved if the mutual position of the above described auxiliary nozzles 21 mounted on the rocking shaft 24 and of the reed 3 mounted on the slay shaft 6 in the pick position, is definitely specified The unidirectional rotary movement of the main shaft 5 of the weaving machine, whether the operative or the reverse one, is transmitted in synchronism, by any means of motion transmitting connection in the example of embodiment by indented belts 31 and 32, on the one hand to the rocking mechanisms 29 and 30 and by them transformed into a reversing rotary motion transmitted simultaneously to each of the two extremities of the rocking shaft 24 and resulting in a rocking movement of the auxiliary nozzles 21 and, on the other hand, in the housings 4 of the batten mechanism where it is transformed into a reversing rotary motion of the slay shaft 6 resulting in the rocking movement of the reed 3

Claims

PATENT CLAIMS

1 Pneumatic weaving machine with a control mechanism for auxiliary nozzles comprising a reed connected by means of a batten mechanism with the mam shaft of the weaving machine and consisting of dents fitted with teeth forming a direct guide channel with open profile whose open section is oriented toward the beat-up section, with a plurality of auxiliary nozzles connected to a source of compressed air and arranged, in the pick position of the reed, opposite, and W the beat-up position outside, the open section of the direct guide channel, characterized by that the auxiliary nozzles (21 ) are fixed on a rocking shaft (24) whose extremities are seated in rocking mechanisms (29, 30) mounted on the frame (1 ) of the weaving machine and coupled for motion with the mam shaft (5) of the weaving machine

2 Pneumatic weaving machine as claimed in Claim 2 characterized by that on the rocking shaft (24) is adjustably fixed one extremity of arms (23) whose the other extremity carries a support (22) in which the auxiliary nozzles (21 ) are seated

3 Pneumatic weaving machine as claimed in Claims 1 and 2, characterized by that the rocking shaft (24) is at least at one place between the rocking mechanisms (29,30) rotatably mounted in a suspension (25) fixed to an upper beam (26) mounted on the frame (1 ) of the weaving machine and situated above the rocking shaft (24)

4 Pneumatic weaving machine as claimed in Claims 1 to 3, characterized by that each auxiliary nozzle (21 is connected by means of a hose (34) with an electromagnetic valve (35) mounted on a holder (350) of the upper beam (26) and is through a supply line (36) connected to the source of compressed air

5 Pneumatic weaving machine with control nozzles as claimed in Claim 1 to 4, characterized by that the rocking mechanisms are connected with the mam shaft (5) by indented belts (31 , 32)