EP1582614A1 - Device for supply of yarn amount - Google Patents

Abstract

A knitting machine receives a supply of thread through a thread feed station located between a bobbin and a buffer store. The buffer store is a feed wheel (2) from which thread (100) is drawn and surrendered to a feed tube (11) via an eye (33) that rotates in either direction around the feed wheel. The feed wheel incorporates a spring-operated arm (202 with an eye (208). The thread passes between two rollers.

Description

The invention relates to a device for supplying a thread amount of a bobbin to a yarn guide.

Such a device is known for example from EP 1 231 310 A1 described.

In the comparison of the machines, which can form textile surfaces, the Flat knitting machine, among other things its strength in that in flat Knitted the contour and in spatial knit the three-dimensional Form can be formed during the knitting process. This can be a Knitted piece with minimal amount of knitting yarn are formed, moreover with the further confection no time for cutting work needed.

The development of these knitted fabrics began with the flat knitted fabrics, the internationally "fully fashioned". As for a complete Knitted piece, z. For example, for a sweater, several "fully fashioned" - knitted Parts, namely, front, back, sleeves, are joined together It is important that all parts are as uniform as possible Contour can be produced.

The uniformity of knitted fabrics is achieved by the fact that the Knitting thread with as uniform tension of stitch formation is supplied. For this purpose, various facilities, especially feeders, been developed.

In EP 1 231 310 A 1 is also a yarn feeding device described with which the stitch formation a defined amount of thread is supplied. A conveyor roller pair, which by a controllable electric motor is driven, should from the knitting yarn package, the amount of thread remove, which is given at the same moment for the stitch formation. Between the conveyor roller pair and the thread guide the thread is through led an eyelet. This eyelet is located at one with spring force acted arm, which interacts with a sensor. Is that from The amount of thread conveyed by the rollers is identical to that for the stitch formation required amount of thread, so the arm is in its normal position. Is from the rolls are fed more thread than is needed for the stitch formation, the arm pivots in the direction of its Federkraftbeaufschlagung, and the Sensor detects the angle change by how much the thread feeding must be reduced. Is less thread promoted than for the Meshing is needed, then the arm is against his Beaufschlagungsrichtung deflected by the spring. This recognizes the Sensor turn from the deflection angle to how much the thread feeding must be increased.

The amount of thread taken by the pivoting range of the arm is a thread reserve quantity that is needed if that Conveyor system at startup first overcome its mass moment of inertia must before the yarn feeding begins. The pivoting movement of the arm in Direction of his Federkraftschlagung is also exploited to Thread return movement as the thread guide moves from its position outside the needle room towards the needle room towards Thread delivery device moves. Since in this device the thread means Conveyor rolls is deducted directly from the spool, he still has the different voltages, as they occurred during winding of the coil are. Since each thread has a more or less great elasticity, falsify the different tensions in the thread the amount of thread that the Meshing is supplied. Therefore, in this system, the arm, with which a thread quantity can be regulated, already from the functional principle needed. A disadvantage of the device according to EP 1 231 310 A 1 is that a thread amount can be promoted only to the thread guide out and not also away from the thread guide. This allows a yarn guide only way be set far from the knitting that the arm the amount of thread can catch up when the yarn guide to the fabric towards the Thread delivery device moves. The amount of thread, which then used to stitch is used, is so long no defined amount of thread for this Meshing section until the arm is pivoted to its normal position and uses the thread conveyance through the rollers.

The Applicant has set itself the task of a device for delivery a thread amount in a flat knitting machine taking into account each To create yarn guide movement, so that exactly the amount of thread of the Meshing is supplied, which is actually needed.

This task is performed by a device for the delivery of each phase the knitting process just required amount of thread to a yarn guide solved a knitting machine, the device between a thread bobbin and the thread guide arranged means for storing a thread amount and means for yarn delivery to the yarn guide and away from this. Advantageously, thus the thread guide always at each of his Moves the exact amount of thread just needed for the knitting process be supplied.

By a thread guide movement on the device according to the invention is not required thread from the means for thread feeding through a corresponding direction reversal of the conveying direction again the means for Storage of a quantity of thread supplied.

In technical implementation of the solution of the invention are two alternatives conceivable: It can the means for storing a thread amount by a Fournisseur be trained on the one withdrawn from the bobbin Amount of thread wound and from the means for yarn delivery to the Yarn guide issued and by the yarn guide movement on the Device to unneeded thread can be resumed.

The means for conveying the thread may, for example, comprise a thread eyelet, in both directions of rotation along the circumference of the feeder is movable. This is a delivery of the exact amount of thread required possible.

The means for storing a thread amount but can also by a pivotally arranged arm with an eyelet through which the thread passed through, be formed.

As a means for yarn delivery, a pair of conveyor rollers, in the Conveying direction is reversible, can be used.

In a further development of the invention, a device for determining the required amount of thread, for example, pattern, machine and Garndaten be provided with the drive of the means for thread feeding is coupled.

Hereinafter, preferred embodiments according to the invention Devices described in more detail with reference to the drawing.

Fig. 1

eine schematische Darstellung einer ersten erfindungsgemäßen Vorrichtung zur Lieferung einer Fadenmenge;

Fig. 2

einen Schnitt längs einer Linie A-A durch die Vorrichtung gemäß Fig. 1;

Fig. 3

eine erste zugeführte Fadenmenge;

Fig. 4

eine zweite zugeführte Fadenmenge;

Fig. 5

eine schematische Darstellung einer zweiten erfindungsgemäßen Vorrichtung zur Lieferung einer Fadenmenge.

In detail shows:

Fig. 1

a schematic representation of a first device according to the invention for supplying a thread amount;

Fig. 2

a section along a line AA through the device of FIG. 1;

Fig. 3

a first amount of supplied yarn;

Fig. 4

a second amount of supplied yarn;

Fig. 5

a schematic representation of a second device according to the invention for supplying a thread amount.

1 shows a device 1 for delivering a quantity of thread, with the help of which during the knitting process in each knitting row each needle is fed exactly the amount of thread that it needs in order to form a knitted fabric according to the specifications regarding pattern size , The device 1 consists of a feeder 2 as a means for storing a thread amount and a device 3 for promoting the required amount of thread, which are connected to each other via a holder 4 .

The feeder 2 comprises a winding ring 22, which can be driven by a controllable electric motor 21 in the direction of arrow 23 . Characterized a supplied through an eyelet 24 thread 100 is wound on the cylindrical rigidly arranged winding body 25 . The electric motor 21 is driven so that there is always a predetermined number of thread windings 26 on the winding body 25. When applying the thread windings 26 on the winding body 25, the different stresses in the thread can be compensated, which are incurred during winding on a yarn bobbin 10 . A largely uniform tension in the thread 100 ' is the prerequisite that an exact dosage of the amount of thread can be realized.

The device 3 comprises an arm 32 which can be driven by an electric motor 31 so that it circles around the winding body 25 with an eyelet 33 . In this case, the encircling can be carried out counter to the thread winding, so that the thread is unwound from the winding body 25. The encircling can also be performed in the direction of the thread winding, so that the thread is wound onto the winding body 25.

• Fadenmenge für jede Nadel, welche am Strickvorgang beteiligt ist;
• Verteilung der aktiven Nadeln im vorderen und/oder hinteren Nadelbett (Gestrickbreite);
• Geschwindigkeit des Fadenführers;
• Bewegungsrichtung des Fadenführers, von der Spule weg und zur Spule hin;
• Überlaufweg des Fadenführers über die jeweiligen Randnadeln des Gestricks.

The amount of thread for each stitch corresponds to a partial circumference of the bobbin 25. This amount of thread must be unwound by means of the arm 32 in the available time unit of the winding body 25. So that the exact amount of thread can be fed exactly to the relevant needle, the electric motor 31 is controlled by a control unit 6 via a control signal line 5 . A machine control unit 8 supplies via a data line 7 the following information to the control unit 6 for controlling the electric motor 31:

• Amount of thread for each needle involved in the knitting process;
• Distribution of the active needles in the front and / or rear needle bed (knit width);
• Speed of the thread guide;
• Direction of movement of the thread guide, away from the coil and towards the coil;
• Overflow path of the thread guide over the respective edge needles of the knitted fabric.

From this data, the control unit 6 calculates the amount of thread, which are unwound from the bobbin 25 in a certain time must, and controls the electric motor 31 so that the arm 32 with the eyelet 33rd in the required speed a corresponding circular motion around the Winding body 25 performs.

The path of the thread 100, 100 ', 100 " from the loop 10 for forming stitches 12 is shown by way of example in Fig. 1. The thread 100, which is subject to different voltages through the coil winding, is withdrawn from the coil 10 via a deflection point U1 After it has passed a thread breakage sensor 15 , it is guided via a deflection point U2 through a hollow axis of the feeder 2 and wound around the winding body 25 with the winding ring 22 and its eyelet 24. The stresses in the thread 100 and the thread 100 are equalized here 'lies with uniform tension on the winding body 25. This thread 100' is unwound as a metered amount of thread 100 "by means of the arm 32 from the winding body 25 and through the hollow shaft of the device 3 via the yarn breakage sensor 15, the deflection U3 and U4 and with the help of a Thread guide 11 of the stitch formation 12 is supplied.

It is shown by way of example that the stitch formation 12 can take place with different needle divisions and mesh sizes. In a section 12 ' medium stitches are formed on a front and a back needle bed. In a section 12 " , stitches of the same size are formed only on the back needle bed In section 12"' , medium stitches are formed only on the front needle bed and in section 12 " , relatively large stitches are formed on the front and back needle bed.

For every single stitch, no matter in which mesh or in which As it is formed, the device 3 doses the correct amount of thread for the mesh in question.

Fig. 2 shows an enlarged view of the arm 32 and the eyelet 33 of the device 3. If the arm 32 is moved in the direction of the arrow 40 , a defined amount of thread from the winding body 25 is unwound. During a movement of the arm 32 in the direction of the arrow 50 , a defined amount of thread is wound onto the winding body 25.

FIGS. 3 and 4 illustrate the supply of different amounts of yarn as required by the same fabric device 3 in the same needle space NR as the yarn guide 11 moves away from or towards the device 1.

According to FIG. 3 , the yarn guide 11 moves away from the device 1 in the direction of the arrow X. From the parking position of the yarn guide 11 to a starting needle NA of the needle space NR (distance S1) , no amount of yarn must be unwound from the winding body. From the thread guide position on the needle NA to the thread insertion position for the needle NA (distance S2 ), the amount of thread must be unwound from the winding body, which corresponds to the yarn guide S2. During the thread insert movement of the thread guide over the entire needle space (route S3 ), a quantity of thread must be unwound from the winding body, which corresponds to the mesh sizes and the needle division of all needles of the needle space plus the thread guide path S3. From the thread guide end position to the thread guide parking position (route S4), the amount of thread must be unwound from the winding body, which corresponds to the yarn guide path S4.

Fig. 4. , however, the movement of the yarn guide 11 in the direction of arrow X ' to the device 1 to. From the parking position of the yarn guide to the starting needle NE of the needle space NR (distance S1' ), the amount of thread must be wound on the winding body, which the Yarn guide path S1 'corresponds. From the thread guide position over the needle NE to the thread insertion position for the needle NE (distance S2 ') , no amount of thread has to be wound on or from the winding body. During the thread insert movement of the thread guide over the entire needle space (distance S3 ' ), a quantity of thread must be unwound from the winding body, which corresponds to the mesh sizes and the needle division of all needles of the needle space minus the thread guide path S3. From the thread guide end position to the yarn guide parking position (route S4 ' ), no amount of thread needs to be wound on or off the winding body.

In an alternative embodiment, shown in FIG. 5 , a device 200 for delivering a defined amount of thread to a yarn guide 201 comprises a spring-loaded arm 202 and two feed rollers 203 and 204.

The withdrawn from a coil 205 thread 206 is guided over a guide roller 207 . The arm 202 has at its end associated with the thread 206 an eyelet 208 , through which the thread 206 is passed. The rollers 203 and 204 clamp the thread 206. Rotational movements of the rollers 203 and 204 (see double arrows 209 and 210 ) lead a quantity of thread to the yarn guide 201 toward or away from it. A compensation of the amount of thread upon movement of the yarn guide 201 on the device can be achieved by the movement of the arm 202 in the direction of arrow 211 in the direction of the spring force, whereby the thread 206 always remains taut. Depending on the deflection of the arm 202, thread can be stored over the distance of the deflection.

REFERENCE NUMBERS

1

Device for delivering a quantity of thread

2

fournisseur

3

Device for thread conveyance

4

bracket

5

Control signal line

6

control unit

7

data line

8th

Engine control unit

12

knitting

12 '

section

12 "

section

15

Yarn breakage sensor

21

electric motor

22

wrapping ring

23

arrow

24

eyelet

25

bobbin

26

filament winding

31

electric motor

32

poor

33

eyelet

40

arrow

50

arrow

100

thread

100 '

thread

100 '

thread

200

Device for delivering a quantity of thread

201

thread guides

202

poor

203

roller

204

roller

205

Kitchen sink

206

thread

207

idler pulley

208

eyelet

209

double arrow

210

double arrow

211

arrow

U1

deflection

U2

deflection

U3

deflection

U4

deflection

NE

needle

NO

needle chamber

N / A

initial needle

S1

route

S2

route

S3

route

S4

route

S1 '

route

S2 '

route

S3 '

route

S4 '

route

X

arrow

Claims (6)

Device (1; 200) for delivering the amount of yarn currently required for each phase of the knitting operation to a yarn guide (11; 201) of a knitting machine, characterized in that the device (1; 200) is disposed between a yarn package (10; 205) and the yarn guide (11; 201) arranged means for storing a yarn amount and means for yarn delivery to the yarn guide and away from it. Apparatus according to claim 1, characterized in that the means for storing a thread amount by a feeder (2) are formed, on which one of the thread bobbin (10) withdrawn amount of thread (100) wound up and from the means for conveying the thread to the thread guide (11 ) and can be resumed by the yarn guide movement on the device not required thread again. Apparatus according to claim 2, characterized in that the means for conveying the thread comprise a thread eyelet (33) which is movable in both directions of rotation in a circular movement about the feeder (2). Apparatus according to claim 1, characterized in that the means for storing a quantity of thread by a pivotally arranged, spring-loaded arm (202) having an eyelet (208) through which the thread (206) is passed, are formed Apparatus according to claim 4, characterized in that the means for yarn delivery as a pair of conveyor rollers (203, 204) for moving the yarn (206) to the yarn guide (201) and are formed away from it. Device according to one of the preceding claims, characterized in that a device (6) for determining the amount of thread is provided, which is coupled to the drive of the means for thread feeding.

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