GB2106548A

GB2106548A - Weft patterning devices, shuttleless looms

Info

Publication number: GB2106548A
Application number: GB08225128A
Authority: GB
Inventors: Krum Kostov Tzvetkov; Toncho Petrov Tonev; Ivan Georgiev Petkov; Mihail Grigorov Mintov; Haralampi Naumov Paskov; Ivan Dimitrov Dushanov; Petko Antonov Filipov
Original assignee: Centralen Savet Pri N Tech
Current assignee: Centralen Savet Pri N Tech
Priority date: 1981-09-04
Filing date: 1982-09-03
Publication date: 1983-04-13
Also published as: JPS5841942A; FR2514038B3; BG34693A1; CS241118B2; DE3231094A1; CS605182A2; IT1152384B; IT8223000A0; CH657391A5; FR2514038A1; GB2106548B

Abstract

A cam 37 pivots a lever 38 so that a bridge 39 turns levers 5 anti- clockwise, a selected solenoid 2 then attracts its lever 3 so that return of the bridge 39 enables the lever 5 to turn clockwise and push downwards a neb 16 mounted in a fork ended slide 21, the cam 35 then pivots a lever 41 to move a second slide 33 which engages the neb 16 and moves the first slide 21 to the right so that its forked end 30, 31 contacts a segment (48), corresponding to the selected slide 21, and pivots it so that its movement is transmitted to a segment 58 to pivot it to the required picking position. A spring 20 returns the slide 21 to the left to enable further selection to be made. <IMAGE>

Description

SPECIFICATION Apparatus for replacing or selecting weft yarns in a shuttleless weaving machine The present invention relates to apparatus for replacing or selecting weft yarns in a shuttleless weaving machine, which apparatus will find applications for example in the textile industry.

It has been proposed, for replacing coloured weft yarns in a shuttleless weaving machine, to use means comprising a thread guide with grooves wherein lie weft carriers. The weft guide is connected with a cog which engages with a rack carried by a shaft. The latter has an arm urged by a spring towards the lobes of a programme chain.

That proposal has disadvantages in that it is capable only of a limited repeat sequence and the programme chain can rapidly wear out.

The present invention can provide apparatus for replacing or selecting weft yarns in a shuttleless weaving machine which provides for wider possibilities of patterning and which mitigates or avoids the possibility of defects arising from mechanical wear, at the same time providing for rapid programming of large and varied weft repeats.

An apparatus embodying the present invention, for replacing the coloured weft yarns or threads in a shuttleless weaving machine, serves for control of a weft guide for radially cut longitudinal grooves for carrying the weft. The apparatus comprises an eccentric mounted on the crankshaft of the weaving machine. The eccentric comes into contact with a one-armed lever, one end of which is connected by a socket-joint with an axially mobile glide with a V-shaped groove therein, towards which groove is directed a billshaped arm of a two-armed lever, jointly mounted in a slot in an axially mobile fork situated above the glide. Above that arm is directed another arm of a three-armed lever and towards the opposite arm of that three-armed lever is directed an anchor arranged to be actuated by an electromagnet.

On the ends of the fork adjustable buffers are mounted which are directed towards the two ends of a colour sector which is immovably fixed to a tube mounted upon a shaft. At one end of the tube there are tags which are jointly connected with two rods. The other ends of the two rods are connected by socket joints with tags formed at the end of a tube immovably connected with a weft guide or feeder and mounted coaxially upon a shaft.

The back or rear ends of the glide and the fork are connected to ends of respective springs, the other ends of which springs are connected with the body of the apparatus. Towards it is formed a n -shaped frame, which is jointly fixed to the body of the device by its vertical arms and which encloses the glide, the fork and a vertical arm of the three-armed lever towards which lever the horizontal part of the n -shaped frame is directed.

The vertical arms of the said frame come into contact with projections, at their lower ends, mounted on the crankshaft.

A r -shaped end of an anchor arranged for actuation by an electromagnet steps upon an arm of the three-armed lever (as mentioned above) the vertical arm of which lever is connected to one end of a spring which is fixed at its other end with the body of the apparatus. The vertical part of the 1-shaped two-armed lever is connected to one end of a weaker spring the other end of which spring is connected to a vertical arm formed on the fork.

Next to the latter, there is formed a nest in which a stalk or shaft is mounted on a bearing.

The shaft carries a spring. One end of the spring is immovably connected with the shaft and the other end is bedded into the body.

Embodiments of the present invention can offer the advantages that electronic programming of repeats of colour according to a colour weaving pattern is possible, whilst the available weft feeders of weaving looms, for example Zulzer and STB, do not provide that possibility. Further, the time required for programming patterns is significantly reduced and costs savings can be provided, for example saving of the expenses of metal lobes. Further, possibilities are provided for the modification of two-coloured weaving machines into four- or six-coloured machines.

Reference is made, by way of example, to the accompanying drawing, which shows an axonometric view of parts of apparatus embodying the present invention which are involved in the feeding of a weft yarn of one colour.

To the electromagnet 2 there is a r -shaped anchor 3, which is connected at one end with the corpus 11 by a spring 1. The said anchor 3 with its r -shaped arm 4 steps upon the arm 7 of the three-armed lever 5, which is jointly mounted on a bearing in the axis 10. The arm 6 of the threearmed lever 5 is connected with spring 12, which other end is connected with corpus 11. The arm 8 of the three-armed lever 5 steps with its projection 9 upon the bill-shaped arm 1 5 of the two-armed lever 13, which is fixed rotatively in the slot 19, made into fork 21 by the axis 17, and the latter is fixed immovably to the axially mobile fork 21. Towards the arm 14 of the two-armed lever 13 is fixed the spring 18, which other end is connected with the vertical arm 22 of the axially mobile fork 21.To the back end of the fork 21 is fixed the spring 20, which opposite end is connected with the corpus 11.

Next to the vertical arm 22 of the fork 21 is formed the nest 23, where is mounted on the bearing the stalk 25. On the latter is fixed immovable socket 24, where enters the spring 26. The other end of the spring 26 enters in the socket 27 fixed immovably to the stalk 28, jointly mounted on bearing in the nest 29 of the corpus 11.

Under the bill-shaped arm 1 5 of the two-armed lever 13, on the glide 33 is formed V-shaped groove 34, where gets into the bill 1 6 of the two armed lever 1 3. To the lower part of the glide 33 is formed the bed 42, where is jointly mounted on a bearing the lever 41 and the other end of the said lever is jointly fixed in the bearing 43 of the corpus 11. To the lever 41 comes into contact the lobe 35, carried by the crank shaft 36.

At the two outer parts of the corpus 11 are jointly mounted on a bearing, at the point 40, on the corpus 11 the vertical arms 38 of the n shaped frame 39 and 38, which horizontal part 39 comes into contact with the vertical arm 6 of the three-armed lever 5. To the crank shaft 35 is immovably fixed the finger 37, which is directed to the vertical arms 38 and the n -shaped frame 38, 39.

Perpendicularly to the buffers 20 and 35 of the fork 21 is situated the shaft 44, which lies in a horizontal plane, passing through an axis line of the fork 21.

Upon the shaft 44 coaxially is situated the tube 45, which in its one end has tags 46 and 47.

Upon the tube 45 are fixed immovably at different angles the segments 48, 49, 50, 51. To the tags 46, 47 are jointly hanged up the vertical rods 52, 53, which lower end is also jointly connected with the tags 54, 55 of the tube 57, into which is coaxially placed the shaft 56. Immovably to the tube 57 is fixed the weft feeder 58 with the grooves for the colours 59,60,61,62.

The device functions as follow: When starting the weaving machine the crank shaft 36 rotates and under the action of the lobe 35 and the spring 32 of the glide 33 the lever 41 begins to rock round the bearing 43 and comes into position II from position I. At that the glide 33 from utmost back position comes to utmost front position and goes back.

At every revolution of the crank shaft 36 the finger 37 presses the vertical arms 38 and the n -shaped frame 38-39, which upper horizontal part 39 is pressed to the vertical arm of the threearmed lever 5 and winds it round the axis 10 in anti clockwise direction and that the arm 7 of the same lever is wound in that direction and is separated from the n -shaped part 4 of the anchor 3. At that moment the programme automaton sends to the electromagnet 2 electrical impulse and the anchor 3 is attracted by the electromagnet 2, and its 7 -shaped part 4 does not rub at the arm 7 of the three-armed lever 5 and frees it from keeping by that moment.After the finger 37 of the crank shaft 36 stops pressing the vertical arm 38 of the n -shaped frame 3839 and its horizontal part 39 stops pressing the vertical arm 6 of the three-armed lever 5, the said lever, under the influence of the spring 12 is reversely wound-by the clockwise direction. The arm 8 of the three-armed lever 5 also is wound in that direction and presses with its projection 9 the bill-shaped arm 1 5 of the two-armed lever 13. As a result of the fact that the spring 1 8 stretching the vertical arm 14 of the two-armed lever 13 is weaker than the spring 12, the latter overcomes the resistance moment of the horizontal arm 1 5 of the two-armed lever 1 3 and winds it in anticlockwise direction.The bill 1 6 of the two-armed lever 1 3 projects downwards from the slot 19 of the fork 21 and gets into the V-shaped groove 34 of the glide 33 at the moment when the latter is at position I.

When the lobe 35 brings the lever 41 in position 11, the glide 33 shifts into front endmost position and drags along the fork 21, which on it part overcomes the force of the stopping spring 26, the stalk 25 rotates round the socket joint next 29 and under the force of the spring 26 stops the fork 21 in front endmost postion II.

At the movement of the fork 21 from position I into position II, the fork buffer 30 presses the upper part of the colour segment 48, which forcedly is rotating in clockwise direction by the moment when the fork buffer 31 comes into contact with the lower part of the colour segment 48. In this position the lever 52 raises up, and the lever 53 comes down, and as a result of their joint forces upon the tags 54, 55 they wind the tube 57 round the axis 56, and together with the tube 57 is wound in clockwise direction and the weftfeeder 58.

Since no impulses are given to the electromagnet 2 its anchor 3, under the action of spring 1 stops the arm 7 of the three armed lever 5, and in clockwise direction is wound, and the r -shaped lever 13 with its bill 1 6 frees the glide 21, which under the action of the spring 20 returns at the starting position. Another fork comes out on its place, for another colour. On the same principle act the next forks.

In the apparatus shown in the drawing, an electromagnet 2 is arranged to cooperate with a generally L-shaped anchor member 3 having a foot 4 at one end and which is connected at its other end to a body or frame 11 of the apparatus by a spring 1.

The shaped foot 4 steps upon one arm 7 of a three-armed (i.e. T-shaped) lever 5 which is pivotally mounted on a bearing having an axis 10 on the body 11. Another arm 6 of the lever 5 is connected to one end of a spring 12, the other end of which is connected to the body 11. The third arm 8 of the lever 5 has a projection 9 upon its end which is stepped upon a bill-shaped arm 1 5 of a two-armed lever 1 3 which is rotatably mounted in a slot 19 in a fork member 21. The lever 13 is rotatable about an axis 17, which is immovable relative to the fork member 21, but is otherwise fixed relative to the fork member 21.

The fork member 21 itself is axially or longitudinally mobile.

The second arm 14 of the lever 13 has one end of a spring 1 8 fixed thereto, the other end of which spring is connected to an arm 22 of the fork member 21 which extends transversely of the general longitudinal axis of the fork member 21.

As shown in the drawing, the arm 22 is vertical.

To the rearward of the fork member 21 (the left hand end in the drawing, remote from the forked end of member 21) is a fixed one end of a spring 20 the other end of which is connected to the body 11. Next to the arm 22 of member 21 a nest or bed 23 is formed on which a rotational bearing carrying a stalk or shaft 25 is mounted. The shaft 25 carries a fixed socket 24 which engages one end of the spring 26 the other end of which engages a socket 27 fixedly mounted on a stalk or shaft 28. The shaft 28 is mounted on a rotatable bearing in a nest or bed 29 in the body 11.

A glide member 33 is provided beneath the fork member 21. Under the bill-shaped arm 1 5 of lever 13 a V-shaped groove 34 is provided in the glide member 33, into which the bill 16 of the billshaped arm 1 5 engages. The rear end of the glide 33 is connected to one end of a spring 32 the other end of which is connected to the body 11.

On a lower part of glide member 33 a bed 42 is formed in which one end of a lever 41 is rotatably mounted by means of a bearing. The other end of the lever 41 is rotatably mounted on a bearing 43 fixed to the body 11.

A crankshaft 36 carries a cam or lobe 35 which contacts the lever 41.

On two outer parts of the body or frame 11, vertical arms of a shaped frame 38-39 are mounted. One vertical arm 38 of this frame 3839 can be seen in the drawing. The top horizontal part 39 of this frame 38-39 is shown crosshatched in the drawing. The visible arm 38 is rotatably mounted on the body 11, by means of a bearing, at point 40. The other vertical arm is similarly mounted.

The horizontal part 39 comes in contact with the vertical arm 6 of three-armed lever 5.

On the crankshaft 36 a fixed finger or projection 37 is provided for engagement with the vertical arms of the frame 38-39.

The fork end of the fork member 21 carries buffers 30 and 31. Perpendicularly of the buffers a shaft 44, lying in a horizontal plane, passes through an axis line of the fork member 21.

A tube 45 is coaxially mounted on the shaft 44.

At one end the tube 45 has tags or gears 46 and 47. Segments 48, 49, 50, 51 are fixedly mounted on the tube 45. These segments take up different respective angles. The tags 46 and 47 carry the upper ends of vertical rods 52 and 53 respectively. The lower ends of the rods 52 and 53 are connected respectively to tags or ears 54 and 55 of a tube 57 which is carried coaxially on a shaft 56. A weft feeder 58 with grooves 59, 60, 61 and 62 for different coloured wefts is fixed to the shaft 56.

The apparatus as illustrated in the drawing operates as follows.

When the weaving machine is started the crank shaft 36 rotates, and, by the action of the cam or lobe 35 and the spring 32 connected to the glide member 33, the lever 41 begins to rock or rotate around the bearing 43, moving from the position shown at I to the position shown at II and back again.

The glide member 33 is thus driven by lever 41 from a rearmost position (i.e. a leftmost position-in which it is shown in the drawing) to a most forward position, from which forward position the glide member 33 returns to the most rearward position.

With every revolution of the crankshaft 36 the finger or projection 37 bears against the vertical arms (38) of the n -shaped frame 38-39 so that the upper horizontal part 39 of the frame 38-39 bears against the vertical arm 6 of the lever 5 and turns the lever 5 anti-clockwise around axis 10.

Thereby arm 7 of lever 5 is also turned anticlockwise and is separated from the shaped foot 4 of anchor 3.

At this moment (if appropriate) a programmed automaton or device sends an electrical impulse to the electromagnet 2 which consequently attracts the anchor 3. The shaped foot 4 of the anchor 3 does not then engage the arm 7 of lever 5 and frees the lever 5 for rotation. When, through further rotation of the crankshaft 36, the finger or projection 37 on the crankshaft 36 ceases to bear against the vertical arms of the n shaped frame 38-39 and horizontal part 39 ceases to bear against vertical arm 6 of lever 5, the lever 6 is rotated clockwise under the influence of spring 12. The arm 8 of the lever 5 is thus rotated clockwise and its projection 9 is brought to bear on the bill-shaped arm 1 5 of lever 13.

The spring 18, connected to vertical arm 14 of lever 13 and tending to resist rotation of lever 13, is weaker than spring 12, so that the force of spring 12 overcomes the resistance of spring 18 and the arm 1 5 of lever 1 3 is forced to rotate anticlockwise.

The bill 16 of arm 1 5 thus projects downwards, emerges from slot 19 in fork member 21 and engages the V-shaped groove 34 in glide member 33 with the lever 41 in the position I (and 33 in its leftmost position).

Thereafter, when cam 35 brings lever 41 into position II, and glide member 33 is moved to its most forward (rightmost) position, the glide member drags the fork member 21 along, partly overcoming the force of spring 26.

When fork member 21 thus moves forward the shaft 25 rotates around the socket joint next 29 and under the force of the stop spring 26 is eventually stopped with the lever 41 in position II and with the fork member 21 in its forwardmost (rightmost) position.

This movement of the fork member 21 urges the buffer 30 against an upper part of segment 48 which is forcedly rotated clockwise (untii the buffer 31 contacts the lower part of the segment 48).

The lever 52 is therefore raised and lever 53 is lowered. As a result, through the tags 54 and 55, the tube 57 is turned around the shaft 56, and together with the tube 57 the weft feeder 58 is wound in a clockwise direction. Thereby an appropriate weft yarn is selected or replaced.

If, when the projection or finger 37 bears against the vertical arms (38) of the shaped frame 38-39, and the arm 7 of lever 5 is consequently disengaged from the shaped foot 4 of the anchor 3, no electrical impulse is applied to the electromagnet 2, the shaped foot 4 is not withdrawn from the arm 7 of lever 5 so lever 5 cannot subsequently rotate in a clockwise direction. Thereby, projection 9 on arm 8 of lever 5 cannot be brought to bear on the bill-shaped arm 1 5 of lever 13. In this case, it will thus be understood, the bill 1 6 does not engage the V- shaped groove 34 in glide member 33. So, as glide member 33 moves forward, the fork member 21 remains in a rearmost (leftmost) position.

In such a case, another fork (not shown) of the apparatus may be moved forward to engage a different segment 49, 50 or 51, to replace or select another weft yarn.

A fork member 21 returns from its forwardmost position under action of the spring 20. Thereafter, another fork may be selected for movement to its forwardmost position, for selecting or replacing another weft yarn, as mentioned above.

Claims

1. Apparatus for replacing or selecting weft threads in a shuttleless weaving machine, the apparatus comprising a weft feeder with radially cut lengthwise grooves for weft carriers and an eccentric (35) mounted upon a crankshaft (36), wherein the eccentric (35) mounted upon the crankshaft (36) comes into contact with a onearmed lever (42 of which one end is sockedly jointed with an axially mobile glide (33) in which is formed a V-shaped groove (34) towards which is directed a bill-shaped arm (15) of a two-armed lever (13) jointly mounted in an axially mobile fork (21) placed above the glide (33), an arm (8) of a three-armed lever (5) being directed to the billshaped arm and an opposite arm (7) of the threearmed lever being directed to an anchor (3) arranged for cooperation with an electromagnet (2), fork buffers (30, 31) being regulatedly mounted at the free ends of the fork (21) and directed to two ends of a colour sector (48) which is immovably fixed upon a tube (45) which is coaxially mounted on a shaft (44) at one end of which tube (45) are opened tags (46, 47) jointly connected by rods (52, 53) other ends of which rods are connected with tags (54, 55) formed jointly at the end of a tube (57) coaxially mounted on a shaft (56) and upon which the weft feeder (58) is fixed.

2. Apparatus as claimed in claim 1, wherein respective springs (32, 20) connect the rear ends of the glide (33) and the fork (21) with a body (11) of the apparatus.

3. Apparatus as claimed in claim 1, wherein a n -shaped frame (38, 39) has vertical arms jointly mounted on a body (11) of the apparatus and is directed to an arm (6) of the three-armed lever (5) a horizontal arm (8, 9) of which is directed to the bill-shaped arm (15) of the twoarmed lever (13), and wherein the vertical arms of the n -shaped frame (38, 39) enclose the glide (33) and fork (21).

4. Apparatus as claimed in claim 3, wherein the vertical arms of the n -shaped frame (38, 39) come into contact towards their lower ends, with a projection (37) on the crankshaft (36).

5. Apparatus as claimed in claim 1, wherein the anchor (3) has a r -shaped end (4) which steps upon the said opposite arm (7) of the threearmed lever (5).

6. Apparatus as claimed in claim 1, wherein a nest (23) is formed in the fork (21), in which nest a bearing on one end of a shaft (25) is socket joint mounted, and wherein one end of a spring (26) is placed upon the shaft (25) the other end of which spring is immovably connected with a further shaft (28) which is jointly mounted on a bearing in a bed (29) placed upon a body (11) of the apparatus.

7. Apparatus as claimed in claim 1, wherein the bill-shaped arm (15) of the two-armed lever (13) is horizontal and the two-armed lever (13) is jointly mounted in a slot (19) in the fork (21) with the other, vertical arm (14) connected to one end of a spring (18) which is fixed at its other end to a vertical arm (22) formed on the fork (21).

8. Apparatus as claimed in claim 1, wherein the colour segments or sectors (48, 49, 50, 51) are fixed upon a tube (45) at different angles in accordance with selectable angles of winding of the weft feeder (58).