Yarn feeding device

Abstract

A yarn feeder (1) for supplying a yarn (F) to a textile machine is equipped with a support unit (2), a yarn feeder wheel (4), and two yarn guide elements arranged one behind the other and behind the yarn feeder wheel (4) in the yarn path on the support unit (2). The yarn feeder (1) has at least one exit sensor (22) which is rotatably mounted on the support unit (2) and, during operation, is held in an operating position between the two yarn guide elements by the yarn (F). The two yarn guide elements are designed as a take-up element (20) and a discharge element (21), each having an elongated element with a lateral entry eyelet (32, 42). Each of the elongated elements of the take-up element (20) and the discharge element (21) is subdivided in its lower section into two legs (30, 31; 40, 41). The lateral threading opening (32, 42) is formed between the legs (30, 31; 40, 41).The two legs (30, 31; 40, 41) are connected at their lower ends and form a thread guide section (33, 43). The lateral threading opening (32) of the take-off element (20) is located on one side of the thread path and the threading opening (42) of the exit element (21) is located on the other side.

Description

[0001] The invention relates to a thread feeding device for feeding a thread to a textile machine.

[0002] DE 101 13 184 B4 discloses a yarn feeding device, particularly for knitting machines, comprising a support unit referred to as a housing, a yarn feed wheel, at least two yarn guide elements, and at least one yarn feeler lever, also referred to as a yarn feeler. The yarn feeler lever is pivotally mounted on the housing and designed to pivot from an operating position to a switching position.

[0003] The thread guide elements are designed as thread guide brackets, each consisting of a substantially U-shaped wire bracket with two legs connected by a web. The web guides the thread. The thread feeler lever can also be a wire bracket with legs and a web, with the thread resting on the web of the thread feeler lever during operation.

[0004] The first thread guide bracket is adjustable. Adjustable thread guide brackets are also known from DE 199 32 481 A1 and DE 199 32 482 A1.

[0005] The web of the first thread guide element, together with the web of the thread guide lever, forms a first thread guide eyelet, which guides the thread downward from the thread feed wheel. The web of the thread feeler lever, together with the web of the second thread guide element, forms a second thread guide eyelet, which guides the thread upward. The eyelets thus formed are made up of overlapping open elements. By pressing the thread feeler lever, these thread guide eyelets can be opened to allow threading.

[0006] In this arrangement, the thread is not guided laterally to the thread running direction.

[0007] CN 203559217 U discloses a yarn feeding device comprising a take-off element with two positions for yarn guidance, a web and a closed yarn eyelet, and an outlet element. The outlet element has an elongated element with a lateral threading opening. The elongated element is divided into two legs in its lower section. The lateral threading opening is formed between the legs. The two legs are connected at their lower ends and form a yarn guide section.

[0008] The open thread guide on the web of the take-off element and the arrangement of the lateral threading opening can lead to the thread getting caught in the elements, especially at low thread tension.

[0009] Further prior art is represented by the publications CN 113062036 A, DE 10 2011 053 824 B3, and DE 10 2006 058 083 A1. CN 113 062 036 A discloses a yarn feeding device according to the preamble of claim 1, comprising two yarn guide elements with lateral threading openings and an outlet sensor. The lateral threading openings are arranged on the same side.

[0010] The object of the invention is to develop a yarn feeding device with improved yarn guidance at the outlet. Threading the yarn should be as simple as possible.

[0011] The problem is solved by the features of claim 1.

[0012] A yarn feeding device according to the invention for feeding a yarn to a textile machine is provided with a support unit, a yarn feed wheel, and two yarn guide elements arranged one behind the other in the yarn path on the support unit and behind the yarn feed wheel. The yarn feeding device is provided with at least one yarn feeler lever designed as an outlet sensor, which is rotatably mounted on the support unit and, during operation, is held by the yarn in an operating position between the two yarn guide elements.

[0013] The two thread guide elements are designed as a take-off element and an outlet element, each of which has an elongated element with an inlet eyelet. Each of the elongated elements of the take-off element and the outlet element is divided into two legs in its lower section. A lateral threading opening is formed between the legs. The two legs are connected at their lower ends and form a thread guide section.

[0014] The lateral threading opening of the take-off element is arranged in the thread path on one side and the lateral threading opening of the outlet element is arranged on the other side.

[0015] The design allows for easy threading using just one hand. The design allows for fluid hand movement.

[0016] Preferably, the thread guide section of the take-off element and the outlet element has a ceramic coating on its surface. Alternatively, the thread guide section has an open ceramic eyelet.

[0017] Preferably, the trigger element and the outlet element are made of metal.

[0018] In one embodiment, the threading openings of the take-off element and the outlet element are arranged in the area of ​​the support unit. This achieves the greatest possible distance between the thread guide section and the threading opening. The greater the distance between the threading opening and the passing thread, the lower the risk of the thread becoming snagged during operation.

[0019] In one embodiment, the support unit has a projection that covers the area of ​​the threading opening of the take-off element on the side facing the thread feed wheel. Covering the lateral threading opening ensures secure guidance of the thread as it leaves the thread wheel in various operating states.

[0020] In one embodiment, the take-off element is arranged on the support unit in an adjustable manner. This allows the take-off height of the yarn from the yarn feed wheel to be adjusted. This allows the yarn feeder to be adapted to different operating conditions, such as different yarns.

[0021] In one embodiment, the trigger element is arranged on a slide element. Unlike the pressing together of the legs of a wire clamp known from DE 199 32 481 A1 and DE 199 32 482 A1, a slide element enables simple and intuitive operation.

[0022] In one embodiment, the outlet element has a guide for the slide element. This is a space-saving arrangement of a guide for the slide element.

[0023] In one embodiment, the outlet element has at least two locking openings for the slider element. The locking openings define a flat and a steep withdrawal of the thread from the thread feed wheel. The slider element is provided, for example, with locking lugs that engage in the locking openings.

[0024] In one embodiment, the outlet element is arranged on the support unit by a spring element, wherein the spring element has a guide for the trigger element and the slide element. The spring element holds the outlet element to the support unit by means of a spring clamp.

[0025] In one embodiment, the spring element is designed as a spring plate that is arranged on the support unit under preload. In one example, the spring plate is additionally screwed to the support unit.

[0026] In one embodiment, the take-off element has a first, lower section and a second section, which are arranged at an obtuse angle to each other. In one embodiment, a section of the spring element with the guide for the second section of the take-off element extends obliquely to the vertical near the lower end of the support unit such that by moving the second section of the take-off element downwards and backwards along the section of the spring element, the first section of the take-off element with the thread guide section is moved downwards and forwards.

[0027] The advantage of this arrangement is that small components are possible.

[0028] The invention is further explained using an embodiment schematically illustrated in the drawing. Shown are: Figure 1 a simplified side view of a yarn feeding device according to the invention; Figure 2 the simplified side view of the Figure 1 , wherein a section of a vertical section through the yarn feeding device in the region of an arrangement of a take-off element and an outlet element on the support unit is shown; Figure 3a a section of a simplified view of the thread feeding device from the rear in a first position of the take-off element for a flat thread take-off; Figure 3b one of the Figure 3a corresponding cutout in a second position of the take-off element for a steep thread take-off; Figure 4a a section of a simplified view of the yarn feeding device from the front in the first position of the take-off element; Figure 4b one of the Figure 4acorresponding cutout in the second position; Figure 5a a detail of a vertical section through the yarn feeding device in the area of ​​the arrangement of the take-off element and the outlet element on the support unit in a first position of the take-off element; and Figure 5b one of the Figure 5a corresponding cutout in a second position of the trigger element.

[0029] The excerpt of the Figure 5a corresponds to the Figure 2 visible section.

[0030] In the Figures 1 and 21 shows a yarn feeding device 1 according to the invention for feeding a yarn F to a textile machine. The yarn feeding device 1 has a support unit 2 with a fastening clamp 3. The yarn feeding device 1 is provided with a yarn feed wheel 4, which is arranged at a lower end of a shaft 5 extending through the support unit 2 and mounted in the support unit. At least one pulley 6, in this example two pulleys 6, and a clutch with a handle 7 are arranged on the shaft 5.

[0031] In the course of the thread F in front of the thread feed wheel 4, ie in the inlet, an inlet eyelet 8, a knot catcher 9, a thread brake 10 and an inlet sensor 11 are arranged on the support unit 2.

[0032] The support unit 2 comprises a support arm 12 and a housing with a first housing part 13 and a second housing part 14.

[0033] In the path of the thread F after the thread feed wheel 4, i.e., in the outlet, a first thread guide element and a second thread guide element are arranged one behind the other on the support unit 2. The thread guide elements are designed to guide the thread F delivered by the thread feed wheel. The first thread guide element behind the thread feed wheel 4 is designed as a take-off element 20, and the second thread guide element is designed as an outlet element 21.

[0034] The yarn feeding device 1 is provided with a runout sensor 22, which is mounted on the support unit 2 so as to be rotatable about a rotation axis. The runout sensor 22 is designed to pivot from an operating position, in which the runout sensor 22 is held by the yarn F, into a switching position.

[0035] During operation, the outlet sensor 22 is held by the thread F in the operating position located between the take-off element 20 and the outlet element 21.

[0036] The structure and function of the two thread guide elements, take-off element 20 and outlet element 21 behind the thread feed wheel 4 are described in the Figures 3a, 3b, 4a, 4b and 5a, 5b shown.

[0037] The take-off element 20 is formed by an elongated element, e.g., a metal strip. It comprises two sections arranged at an obtuse angle to each other, with the lower, first section facing the yarn feeder 4.

[0038] The lower section of the trigger element 20 has two legs 30, 31. The leg 30, which is in the Figures 3a and 3b can be seen on the left side, merges at its upper end into the upper section of the take-off element 20. The leg 31 forms a lateral threading opening 32 at its upper end. At their lower end, the two legs 30, 31 meet and form a thread guide section 33 with a U-shaped ceramic eyelet 34.

[0039] The upper, second section of the trigger element 20 comprises a flat section 35 with an end section 36 which is, for example, T-shaped.

[0040] The outlet element 21 is formed by an elongated element, e.g., a metal strip. It comprises three sections. The first and second sections are arranged at an obtuse angle, with the lower section facing the yarn feed wheel 4.

[0041] The lower, first section of the outlet element 21 has two legs 40, 41. The leg 40, which is in the Figures 3a and 3b As can be seen on the right, it forms a lateral threading opening 42 at its upper end. The leg 41 merges into the second section at its upper end. At their lower ends, the legs 40, 41 meet and form a thread guide section 43 with a U-shaped ceramic eyelet 44.

[0042] The middle, second section is a guide section 45 which has an elongated guide opening 46 which is widened at each of its ends to form a locking opening 47.

[0043] The upper, third section of the outlet element 21 is an end section 48 which extends vertically upwards at an obtuse angle to the guide section 45 into the support unit 2 along a housing wall of the first housing part 13.

[0044] In the thread path, the lateral threading opening 32 of the take-off element 20 is on one side, in the Figures 3a, 3b on the left side, and the lateral threading opening 42 of the outlet element 21 is on the other side, in the Figures 3a, 3b on the right side.

[0045] This makes it possible to place the thread with one hand first into the lateral threading opening 32, then under the outlet sensor 22 and finally into the lateral threading opening 42 of the outlet element 21.

[0046] The lateral threading openings 32 and 42 are arranged close to the support unit 2, here on the first housing part 13.

[0047] The support unit 2 covers the area of ​​the threading opening 32 of the take-off element 20 on the side facing the yarn feed wheel 4. The first housing part 13 has a projection 13a that extends slightly over the second section of the take-off element 20.

[0048] A slide element 50 is arranged on the second section of the outlet element 21. The slide element 50 is made of plastic. The slide element 50 is formed in its lower, first section by two locking arms 51, which have gripping elements 52 on the outside that encompass the second section of the outlet element 21 and locking lugs 53 on the inside that are guided in the guide opening 46. Two positions of the slide element 50 are defined by the two locking openings 47, into which the locking lugs 53 engage.

[0049] A second section of the slide element 50, which adjoins the locking arms 51 and is designed as a holder section 54, ends with an engagement 55 which surrounds the T-shaped end section 36 of the take-off element 20. The slide element 50 provides the take-off element 20 with a first position for a flat thread take-off, which Figures 3a, 4a, 5a can be seen, and a second position for a steep thread take-off, which can be seen in Figures 3b, 4b, 5b.

[0050] A spring element 60 is provided for arranging the trigger element 20 and the trigger element 21 on the support unit 2, specifically on the first housing part 13. The spring element 60 is formed by an elongated element, e.g., a metal strip.

[0051] In the first housing part 13 of the support unit 2, an elongated, downwardly open space is formed, in which the spring element 60, with its three lower sections 61, 62, 63, is arranged in a zigzag pattern under pretension. With its fourth section 64 adjoining it at the top, the spring element 60 clamps the end section 48 of the outlet element 21 against the first housing part 13.

[0052] In its fifth section, not shown in the figures, the spring element 60 is fixed to the support unit 2.

[0053] The spring element 60 has in its second section 62, which extends in extension of the second section of the outlet element 21, a guide for the T-shaped end section 36 of the trigger element 20. The guide is formed, for example, by a narrow opening for the T-shaped end 36.

[0054] The engagement 55 of the slide element 50 encompasses the T-shaped end 36 of the trigger element 20.

[0055] When the slide element 50 is moved on the outlet element 21 from the first position for a flat thread take-off ( Figures 3a, 4a, 5a ) into the second position, the engagement 55 engages the T-shaped end section 36 of the take-off element 20 and moves it along the guide of the second section 62 of the spring element 60 to the second position of the slide element 60 for a steep thread take-off ( Figures 3b, 4b, 5b ).

[0056] The second section 62 of the spring element 60, like the second section of the outlet element 21 with the guide opening 45, extends obliquely to the vertical. The second section 62 of the spring element 60 is arranged close to the lower end of the support unit 2.

[0057] Displacing the T-shaped end portion 36 of the trigger element 20 downward and backward along the slopes formed by the second portion 62 of the spring element 60 causes the first portion of the trigger element 20 with the thread guide portion 33 to pivot downward and forward. This means that displacing the slide element 50 downward and backward causes the thread guide portion 33 of the trigger element 20 to move downward and forward. Reference symbol list

[0058] 1 Yarn feeding device 50 Slider element 2 Support unit 51 Locking arm 3 Fastening clamp 52 Grip element 4 Yarn feed wheel 53 Locking lug 5 Shaft 54 ​​Holder section 6 Pulley 55 Grip 7 Handle 8 Inlet eyelet 60 Spring element 9 Knot catcher 61 First section 10 Yarn brake 62 Second section 11 Inlet sensor 63 Third section 12 Support arm 64 Fourth section 13 First housing part 13a Projection of the first housing part F Yarn 14 Second housing part 20 Take-off element 21 Outlet element 22 Outlet sensor 30Leg of the take-off element 31Leg of the take-off element 32Threading opening 33Thread guide section 34Ceramic eyelet 35Flat section 36T-shaped end section 40Leg of the outlet element 41Leg of the outlet element 42Threading opening 43Thread guide section 44Ceramic eyelet 45Guide section 46Guide opening 47Locking opening 48End section

Claims

1. Thread feeding device (1) for feeding a thread (F) to a textile machine, with a support unit (2), with a thread feed wheel (4), with two thread guiding elements which are arranged in the thread path on the support unit (2) one behind the other and behind the thread feed wheel (4), and with an outlet sensor (22), which is rotatably mounted on the support unit (2) and is held in an operating position between the two thread guiding elements by the thread (F) during operation, wherein the two thread guiding elements are designed as a take-off element (20) and an run-out element (21), each of which has an elongate element with an inlet eyelet (32, 42), wherein each elongate element is divided in its lower section into two legs (30, 31; 40, 41), a lateral threading opening (32) is formed between the legs, the two legs (30, 31; 40, 41) are connected at their lower ends and form a thread guiding section (33, 43), characterized in that the lateral threading opening (32) of the take-off element (20) in the thread path is arranged on one side and the lateral threading opening (32) of the run-out element (21) is arranged on the other side.

2. Thread feeding device (1) according to claim 1, characterized in that the threading opening (32) of the take-off element (20) and the run-out element (21) is arranged in the region of the support unit (2).

3. Thread feeding device (1) according to claim 1 or 2, characterized in that the support unit (2) has a projection (13a) which covers the region of the threading opening of the take-off element (20) on the side facing the thread feed wheel (4).

4. Thread feeding device (1) according to one of claims 1 to 3, characterized in that the take-off element (20) is arranged adjustably on the support unit (2).

5. Thread feeding device (1) according to claim 4, characterized in that the take-off element (20) is arranged on a sliding element (50).

6. Thread feeding device (1) according to claim 5, characterized in that the run-out element (21) has a guide for the sliding element (50).

7. Thread feeding device (1) according to claim 5 or 6, characterized in that the run-out element (21) has at least two locking openings (47) for the sliding element (50).

8. Thread feeding device (1) according to one of claims 5 to 7, characterized in that the run-out element (21) is arranged on the support unit (2) by means of a spring element (60), the spring element (60) having a guide for the take-off element (20) and the sliding element (50).

9. Thread feeding device (1) according to claim 8, characterized in that the take-off element (20) has a first section and a second section which are arranged at an obtuse angle to one another, and in that a section (62) of the spring element (60) with the guide for the take-off element (20) runs at such an angle to the vertical close to the lower end of the support unit (2), that by displacing the second section of the take-off element (20) along the second section (62) of the spring element (60) downwards and rearwards, the first section of the take-off element (20) with the thread guiding section (33) is moved downwards and forwards.

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