EP1605085A1 - Thread take-up device - Google Patents

Abstract

To maintain the yarn tension during reversal of the carriage at the end of its travel, the yarn (40) is taken through a clamp (2) and an eyelet (13) at the end of a spring-loaded dancer arm (1). The movement (SG) of the arm (1) takes up the surplus yarn (W) during carriage reversal (X, Y) and also operates the clamp (2). During part (SL) of the movement the clamp is open, but is shut during the remaining part (SF) to avoid excess yarn feed. Alternative trigger mechanisms are shown to provide sudden closing and opening of the clamp. The dancer arm swings round a pivot (10) and is a double-ended lever, the upper end (12) operating the trigger. The clamping force is provided by a separate spring and does not depend on the yarn tension.

Description

The invention relates to a Fadenaufhol device with a Fadenaufholarm.

At the latest with the dissemination of the "fully fashioned" knitting technique, with which formed the contour of the knitted piece on the flat knitting machine Fadenaufholvorrichtungen become known.

"fully fashioned" knitted pieces must have exact edges. Therefore must the thread can be safely inserted into any edge needle, no matter if the Thread guide away from the thread strand or on this to the edge needle emotional.

For safe thread insertion into the edge needles, during the thread guide movement Toward the thread strand, Fadenaufholvorrichtungen were developed, which catch up the amount of thread that the distance from the thread guide parking position corresponds to the thread insertion position in the edge needle.

All known Fadenaufhol devices have in common that a spring-loaded Aufholarm, which is pivotally mounted on an axle, catching up the thread by pulling the thread away from the thread guide. In the The rule is the innermost and outermost pivot position of the swivel arm mechanically limited.

In the sophisticated thread catching devices, the Pivoting position of the Aufholarms monitored by sensors. As soon as the Aufholarm in its pivoting motion, in which he catches the thread, the Sensor is reached, an electromechanical clamp is closed and This breaks the thread feed from the spool. Reached the Fetch arm the sensor in the movement, which of the the knitting process supplied thread is so opens the electromagnetic Clamp and the thread feeder from the coil ago is free again. There highest developed flat knitting machines on the left and right machine front side each have a Fadenaufhol device and each of these Devices can have up to 16 Aufholarme, the big effort apparent from the number of components (sensors and terminals) and the Control technology is needed. In particular, the control technology Effort for the assignment of signals from 32 sensors to the relevant 32 electromagnetic clamps is significant.

The invention is based on the object, a technically simple Construction of a Fadenaufhol device to create, which nevertheless a reliable thread recovery guaranteed.

This object is achieved by a Fadenaufhol device with a Fadenaufholarm and a thread clamp for clamping the thread between a thread bobbin and a thread eye of Fadenaufholarms solved, the Opening and closing the thread clamp directly by the movement of the Fadenaufholarms is effected. The invention is the principle of operation of a Fadenaufhol device based on which each Fadenaufholarm a purely mechanically operating thread clamp is assigned, the closing and Opening movement is effected by Fadenaufholarm.

If the Fadenaufholarm comes in its pivoting movement to catch up to the limit of a fixed swivel range, it solves the closure the thread clamp off. The Fadenaufholarm comes in its pivoting movement for threading to this limit of the swivel range, so he opens the thread clamp and locks the opening position.

The thread clamp causes its closing movement and its clamping force preferably self-sufficient. The Fadenaufholarm is no kinetic energy needed.

Technical implementations and developments of the above Operating principles are described in claims 2 to 8.

Fig. 1:

einen Fadenlauf von einer Spule zum Gestrick unter Verwendung einer Fadenaufhol-Vorrichtung;

Fign. 2a bis 2c:

eine erste Ausgestaltung eines Hebelarms der Fadenaufhol-Vorrichtung und einer mit diesem zusammenwirkenden Klemme in verschiedenen Öffnungs-bzw. Schließstellungen;

Fig. 3:

eine zweite Ausgestaltung des Hebelarms und der Klemme.

Two preferred embodiments of the invention are shown schematically in the drawing. It shows in detail:

Fig. 1:

a yarn path from a spool to the fabric using a thread catching device;

FIGS. 2a to 2c:

a first embodiment of a lever arm Fadenaufhol device and cooperating with this terminal in different opening or. Closed positions;

3:

a second embodiment of the lever arm and the terminal.

According to Fig. 1 , a Fadenaufhol device 100 comprises a Aufholarm 1 and a thread clamp 2. By Aufholarm 1 is a two-armed lever (first lever arm 11 and second lever arm 12) is formed, which is pivotally mounted at the pivot point 10 . The first lever arm 11 carries at the lower end of a thread eye 13 and is acted upon in the direction of arrow Z by a spring force. The second lever arm 12 cooperates with a thread clamp 2 and causes or opens the thread clamping.

A thread 40 coming from a spool 30 passes a deflection point 41 and receives its tension on a thread brake 50 , passes through a thread breakage sensor 60, passes a deflection point 42, passes through the thread clamp 2, touches a deflection point 43, passes through the thread eye 13, passes one Turning 44 and is fed by a yarn guide 70 a knitting process 80 .

As long as by means of moving in the direction of arrow X yarn guide 70 thread is fed and the yarn guide 70 moves in the same direction of movement from the fabric edge over the distance W in its Abstellposition, the tensile force in the thread 40 is so large that the Aufholarm at its inner boundary 14th is applied.

To form the next row of knitting yarn guide 70 is moved in the direction of arrow Y against the yarn feed. In this case, no thread is consumed over the distance W , therefore, this amount of yarn must be caught up by the Aufholarm 1 (deducted), so that the thread tension does not fall sharply and the thread 40, from an edge needle 90 , can be safely inserted into the needle hook.

This amount of yarn can make up for the Aufholarm 1 that the acted upon by a spring force in the direction Z Aufholarm 1 starting from its inner boundary 14 performs a pivoting movement. The entire pivoting range SG is between the inner boundary 14 and the outer boundary 15. It divides into a region SL in which the yarn path from the spool 30 to the yarn guide 70 is not interrupted, and a region SF , in which the yarn 40 above the eye 13 of the Aufholarms 1 is jammed.

When the Aufholarm 1 a pivoting movement of its inner boundary 14 executes to the end of the pivotal range SL, the second lever arm 12 releases the locking of the thread clamp 2, so that these spring-loaded Thread clamp 2 the thread 40 jammed. The Aufholarm 1 can, if necessary, continue its pivoting movement until it stops at its outer Limit 15 comes to the plant.

When the Aufholarm 1 a pivoting movement from outside the Pivoting range SL performs towards this, the second lever arm 12 opens the clamp and locks this opening position. At his Swiveling in the area SL is the yarn path from the coil 30 to Thread guide 70 no longer interrupted.

From Fig. 2a it can be seen that the thread clamp 2 is open. This opening position is locked. The Aufholarm 1 is pivoted about an axis 9 so that it rests against its inner boundary 14.

The second lever arm 12 is connected via a hook element 7 with a latch 5 . The hook member 7 comprises with its annular end 71 a bolt 18 which is fixedly connected to the lever arm 12, and with its hook-shaped end 72 a bolt 53 which is fixedly connected to a bolt 5. The bolt 5 is horizontally displaceable in the directions of a double arrow 54 . Due to the shown position of the Aufholarms 1, the latch 5 has been pulled to its extreme left position. In the movement there, he has pivoted another lever 3 about an axis 31 in the position shown. The lever 3 is connected via a hook element 8 with a clamping slide 21 .

The hook element 8 comprises with its annular end 81 a bolt 32 which is fixedly connected to the lever 3, and with its hook-shaped end 82 a bolt 23 which is fixedly connected to the clamping slide 21.

The clamping slide 21 is horizontally displaceable in the directions of a double arrow 26 . In the illustrated position of the Aufholarms 1 and the resulting position of the lever 3, the clamping slide 21 has been pulled to its extreme left position. In this case, a compression spring 24, which is supported on a surface 25 , stretched.

According to Fig. 2a is an end face with a clamping contour 22 of the clamping slide 21 in the open position to a rigidly arranged clamping piece 4. The passage for the thread 40 is so far that to be entangled threads 40 can be clamped in all thicknesses.

The pressing force of the spring 24, which causes the closing movement and the clamping force of the clamping slide 21, is greatest in the open position. Thus, the frictional force between a surface 33 of the lever 3 and a surface 52 of the bolt 5 is kept low, the point of articulation of the hook member 8 is close to the plane of a pivot point 31 of the lever. 3

Does the Aufholarm 1 a pivoting movement between its inner Limit 14 to just before the end of the range SL (see Fig. 1), so he must systematically its inertia and the friction on the axis 9 overcome. The residual force of the spring loading is the thread recovery to disposal.

From Fig. 2b it can be seen that the thread clamp 2 is opened and the lever 3 is almost unlocked.

The Aufholarm 1 is located in the transition region between the pivot areas SL and SF (see Figure 1). The second lever arm 12 has come to rest with its nose 17 on the end face 51 of the bolt 5 and moves it in the direction of an arrow 54 '. The force for the pivoting movement of the Aufholarms 1 comes from a spring 61 which exerts a pulling force on an arm 19 in the direction of arrow 62 . The arm 19, like the arm 12, is an arm located above the fulcrum of the recovery arm 1 designed as a two-sided lever.

As soon as the Aufholarm 1 has reached the limit of its pivoting range SL (see Figure 1), the latch 5 is shifted so far in the direction of the arrow 54 ', that the lock is released. The prestressed compression spring 24 moves the clamping slide 21 abruptly in the direction of an arrow 26 ' until a clamping contour 22 rests against its counterpart 4. With the movement of the clamping slide 21, the lever 3 is pivoted to its vertical position, thereby moving the latch 5 in its outermost position in the direction of the arrow 54 '.

Once the nose 17 rests against the end face 51 of the bolt 5, the Aufholarm 1 with further pivoting additionally the inertia and overcome friction of the bolt 5.

When the lock is released, the Aufholarm 1 can its To perform pivotal movement in the area SF (see Fig. 1) and only has to overcome its inertia and the friction on the axis 9.

From Fig. 2c it can be seen that the thread clamp 2 is closed. The Aufholarm 1 starts just with the opening movement of the clamping slide 21. The Aufholarm 1 is located in the transition region between the pivot areas SF and SL (see Fig. 1).

The positively connected with the lever arm 12 hook element 7 rests with its hook-shaped end 72 on the bolt 53 of the bolt 5 at. The positively connected with the lever 3 hook element 8 abuts with its hook-shaped end 82 on the pin 23 of the clamping slide 21. When pivoting the Aufholarms 1 in the direction of the pivoting range SL (see Fig. 1), the latch 5 is moved in the direction of an arrow 54 " thereby acts on its contact surface 52, the lever surface 33 and pivots the lever 3 about its pivot point 31. The pivotal movement of the lever 3 moves the clamping slide 21 in the direction of an arrow 26 ". The clamping of the thread 40 is released. Once the Aufholarm 1 has reached its pivoting range SL (see Fig. 1), the terminal 2 is in full opening and is locked.

During the pivotal movement of the Aufholarms 1 towards its inner Limit 14 (see Fig. 1) is the force triggering this movement of Thread 40 applied, which is fed to the knitting process. Through this Yarn tension must be the inertia and friction of Aufholarm 1 and the terminal 2 are overcome and also the force of the springs 24 and 61. So that the tension in the thread during the movement of the Aufholarms 1 in the described direction does not increase too much, must in the selection of materials and material pairing of the Aufholarms 1 and the terminal 2 as possible low mass and good sliding properties are respected.

A second embodiment of the invention is shown in FIG . The position of a Aufholarms 1 ' and a terminal 2' correspond to the illustration in Fig. 2a. Depending on the pivot position of Aufholarms 1 ', the terminal 2' is opened by the surface 17 'of the lever arm 12' or triggered their closing movement. The lever arm 12 'assumes with its surface 17', the function of the bolt 5 of Fig. 2a - c.

Reference numerals:

1

Aufholarm

2

thread clamp

3

lever

4

clamp

5

bars

7

hook element

8th

hook element

9

axis

10

pivot point

11

first lever arm

12

second lever arm

13

eyelet

14

inner boundary

15

outer boundary

18

bolt

19

poor

21

clamping slide

22

clamping contour

23

bolt

24

compression spring

25

area

30

Kitchen sink

31

axis

32

bolt

33

area

40

thread

41

deflection

42

deflection

43

deflection

44

deflection

50

thread brake

51

front

52

area

53

bolt

60

Yarn breakage sensor

61

feather

70

thread guides

71

annular end

72

hook-shaped end

80

knitting process

81

annular end

82

hook-shaped end

90

edge needle

100

Fadenaufhol device

1'

Aufholarm

2 '

thread clamp

12 '

lever arm

17 '

area

Claims (9)

Thread catching device (100) with a Fadenaufholarm (1, 1 ') and a thread clamp (2, 2 ') for clamping the thread (40) between a thread spool (30) and a thread eye (13) of the Fadenaufholarms (1; 1 '), wherein the opening and closing of the thread clamp (2, 2') directly by the movement of Fadenaufholarms (1, 1 ') causes becomes. Thread catching device according to claim 1, characterized in that the Fadenaufholarm (1, 1 ') is spring-loaded and pivotally mounted and in a pivot direction upon reaching a predetermined limit of the pivoting range (SL) closing the thread clamp (2, 2') and in the other pivot direction when reaching the limit, the opening of the thread clamp (2, 2 ') triggers. Thread catching device according to claim 1 and 2, characterized in that the clamping force of the thread clamp (2, 2 ') is independent of the kinetic energy of Fadenaufholarms (1). Thread catching device according to one of claims 1 to 3, characterized in that the Fadenaufholarm (1) comprises a first lever arm (11) with a thread eyelet (13) and a second with the thread clamp (2, 2 ') cooperating lever arm (12) , Thread catching device according to one of the preceding claims, characterized in that the thread clamp (2, 2 ') comprises a displaceable clamping slide (21) and a fixedly arranged clamping piece (4). Thread catching device according to Claims 4 and 5, characterized in that the clamping slide (21) is held in the open position against a spring force by the second lever (12; 12 ') when the thread catching arm (1) is not pivoted, and over a limit of the pivoting range (SL) also pivoted Fadenaufholarm (1) is released in the closed position. Thread catching device according to claim 6, characterized in that the clamping slide (21) with a further lever (3) is connected, which cooperates with the second lever (12, 12 '). Thread catching device according to claim 5, 6 or 7, characterized in that the second lever (12) with a latch (5) is connected, which cooperates with the further lever (3). Thread catching device according to claim 8, characterized in that bolt (5) is mounted horizontally movable.

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