TWI665350B - Thread feeding device - Google Patents

Abstract

A yarn feeding device for feeding yarn to a textile machine is provided with a storage body and a braking device, and the braking device is disposed downstream of the storage body along the running direction of the yarn. The braking device includes a braking body and an adjusting device for the braking body. The braking device includes an axially elastic centering unit. The centering unit has an outer support member, an inner support member, and a three spring element. The spring elements are disposed on the outer and inner support members, wherein one of the support members is disposed on at least one adjustment element of the adjustment device, and the other support member is disposed on the brake body. The spring elements are designed as slender curved parts, and extend from one support member to the other support member in a spiral type, wherein one connection point of the spring element is arranged on the one support member, and the connection points are separated by One corner is offset to the other support.

Description

Yarn feeding device

The invention relates to a yarn feeding device for feeding a yarn to a textile machine. The yarn feeding device is provided with a storage body, and the yarn is drawn out from the storage body by the yarn spinning machine. This type of yarn feeding device is also called a storage yarn feeding device. The yarn feeding device has a braking device for adjusting a yarn tension of one of the yarns, which is disposed downstream of the storage body along the yarn running direction. The braking device includes a braking body and an adjusting device for the braking body, wherein the braking body can press a clamping surface at an outlet end of the storage body by the adjusting device.

One problem with this type of configuration is that the brake body must be centered with the axis of the cylindrically shaped storage body at the same time. To this end, the braking device has an axial elastic centering unit as a bracket of the braking body.

European Patent No. EP 0 652 312 B1 describes a positively modulated thread brake with a truncated cone-shaped brake body, which is carried by an elastic material on a drum of a feeding device. ) Before and coaxial with the drum. The elastic member is preferably formed by a set of three springs which are offset from each other by 120 °. The springs are arranged inside a support ring which is rigidly connected to a slider which can slide in parallel with the drum. A pulling device allows the support ring to move, so that an elastic force with which the braking body is pushed onto the drum is changed. This means that the centering unit of the braking device includes the support ring and three springs attached to the braking body. When the support ring is guided, it allows the spring forces of the springs to be adjusted in an axial direction, and the brake body and the spring elements evenly distributed around the periphery are centered. However, a disadvantage is that the spring elements are individually and individually fitted to the support ring and the brake body. It will take time to replace the wear parts of the brake body.

European patent EP 2 719 804 B1 discloses a weft yarn braking device for a yarn feeder with a stationary drum, which comprises a brake assembly having a circular profile and a circular bracket. The middle elastic members are supported coaxially. These elastic members are designed as elongated elastic members, such as coil springs. For example, three coil springs are fixed in an annular bracket at two ends. The middle section of these is engaged with a plurality of mating protrusions of an inner ring, which is coaxially connected with the brake assembly.

This means that the elastic member of the braking device has a centering unit having an outer ring carrier called a ring bracket, an inner ring carrier called a ring and arranged on the brake assembly, and three Spring element. The ring bracket is connected to a frame arranged on a yarn feeder housing.

A modulation yarn brake of a weft yarn feeding device known from European Patent No. EP 0 536 088 B1 includes a conical pile brake body, which is carried by a centering unit called an elastic member on the front and coaxially. The elastic member is a plate member that surrounds the conical pile brake body with a central hole and obtains its elasticity from, for example, a plurality of openings. Designing the centering unit as a plate with multiple openings allows a radial centering at the expense of the adjustability of the axial spring force.

European Patent No. EP 0 534 263 B1 describes a self-adjusting yarn brake for a weft yarn feeding device having a drum, which includes a brake body and an elastic member. The brake body is elastically suspended by the elastic member, and is supported in the front and axial directions. The elastic member may be designed as an annular plate, or a spiral spring, or a cylindrical bellows-like element.

Although one of the axial spring forces provides adjustability in the case of a spiral spring, the spiral spring can be deflected radially. This means that there is no guarantee that the brake body will be centered.

The task of the present invention is to develop a yarn feeding device that is mainly described in accordance with item 1 of the scope of the patent application. The braking force can be easily adjusted and easily centered with a simple axial elastic centering unit.

This task is achieved by the feature of the first patent application scope.

A yarn feeding device for feeding a yarn to a textile machine according to the present invention is provided with a storage body and a braking device, wherein the yarn is drawn from the storage body by the textile machine, and the brake The device is used to adjust the yarn tension of one of the yarns. The braking device is disposed downstream of the storage body along the running direction of the yarn.

The braking device has a braking body and an adjusting device for the braking body. The braking body can press a clamping surface at the lead-out end of the storage body by the adjusting device.

In a specific embodiment, the braking device is designed as a so-called conical brake, which has a conical braking body, wherein the braking body has a truncated cone sleeve shape. The clamping surface at the lead-out end of the storage body is formed by, for example, the storage body. Alternatively, the clamping surface is formed by a clamping element at the lead-out end of the storage body.

The adjusting device is provided with an axial elastic centering unit for the braking device. The centering unit extends perpendicularly, cylindrically, or conically with respect to the axis of the storage body. The centering unit is disposed between the brake body and the adjustment device.

The centering unit has at least one outer and one inner support, and a set of at least three spring elements. Each spring element is disposed on the outer and inner support members. The centering unit is arranged on the at least one adjusting element with a certain supporting member, and is arranged on the braking body with another supporting member.

The spring elements are designed as elongated pieces. The contours of the spring elements are, for example, circular, square, or rectangular. Alternatively, the contours of the spring elements are U-shaped or T-shaped, or have other contour shapes. The spring elements are curved, and each of the spring elements extends from one of the support members to the other support member in a spiral shape. A connection point of one spring element on one support member is configured to be offset by an angle from a connection point on the other support member. The angular offset describes the angle between two radial beams that extend through the connection points on two supports.

The use of an elongated curved member as the spring element allows a simple configuration to be achieved and the spring elements can be snapped onto the support members.

The support members and the spring elements are, for example, made of a metal. The spring elements are, for example, sections designed as a metal wire or a thin strip, and are explicitly connected to the support elements.

In a specific embodiment, the angle between the connection points of the spring elements on one support member and the connection points on the other support member is offset by at least 90 °. In another specific embodiment, the angle is offset by up to 270 °. In yet another specific embodiment, the angle offset is greater than 270 °, such as 360 °.

As the angular offset of the connection points of the spring elements on the supports increases, the length of the spring elements will increase. By changing the angular offset and therefore the length of the spring elements, the strength of the elasticity of the centering unit can be adjusted. The greater the elasticity of the centering unit, that is, the axial and radial elasticity, the greater the angular offset, and therefore the longer the individual spring elements.

In particular, the radial elasticity of the centering unit can be adjusted by the number of spring elements in a set of spring elements. Imagine that the more spring elements in a group, the lower the radial elasticity. This means that the larger the number of spring elements in a group of spring elements, the better the radial centering of the brake body achieved by the centering unit.

The strength of the axial and radial elasticity can therefore be adjusted according to the radial angular offset and the number of spring elements.

In a specific embodiment, one set of the spring elements extends on a horizontal plane in its relaxed state. This would, for example, allow a group of spring elements to be made more easily from a certain metal plate or a certain sheet.

In a specific embodiment, the centering unit has at least one connecting element for arranging a corresponding support member on the braking body.

In a specific embodiment, the centering unit has at least one bracket for arranging a corresponding support member on at least one adjustment element of the adjustment device.

These supports are designed as outer and inner ring carriers. The outer ring carrier is arranged on at least one adjusting element of the adjusting device directly or by means of the bracket, and the inner ring carrier is arranged on the brake body by means of the connecting element.

In a specific embodiment, the centering unit has at least a centering element, which is designed as a single piece from the outer ring carrier, the set of spring elements, and the inner ring carrier. Centering elements, that is, two-ring carriers and multiple spring elements made from a single piece, can be easily produced in large quantities.

In a specific embodiment, the centering unit has at least two centering elements arranged in an overlapping manner. The spring force is increased by double the number of spring elements.

The centring element example is made of plastic. The manufacturing method is, for example, an injection molding method. The plastic used is, for example, a dimensionally stable plastic with good suspension characteristics, such as a polyoxymethyl POM, or a fiber-reinforced plastic such as a fiber-reinforced polyamide PA.

When plastic is used, the outer ring carrier is formed by an outer ring element having a height of, for example, 1.5 mm to 6 mm, and the inner ring carrier is formed by an inner ring having a height of 1.5 mm to 6 mm. Element formation. The spring elements are formed by a curved profile, starting from the outer ring element and opening into the inner ring element, the curved profiles have an elongated rectangular cross section and the elongated rectangular cross section has a 1 Height from 6 mm to 6 mm. The height of these spring elements is, in one example, smaller than those of the ring carriers, such as half their height.

In a specific embodiment, the centering element made of plastic includes a connecting element designed to be a single piece with the inner ring carrier. In a specific embodiment, the centering element made of plastic includes a connection element designed to be a single piece with the outer ring carrier. A plastic core element including a connecting element and / or a bracket can be easily replaced.

In a specific embodiment, the centering element is made of spring steel, that is, a spring steel metal plate, wherein the spring steel plate forms a single piece with the two-ring carrier and the spring elements. The thickness of the spring steel plate is, for example, 0.1 mm to 0.4 mm. The inner and outer ring carriers are each formed by a ring element. In a specific embodiment, the thicknesses of the ring elements and the spring elements are equal.

The centering element made of a spring steel plate is arranged on a connecting element, for example, with its inner ring carrier. The centering element is arranged on a bracket with its outer ring element. The centering element made of a spring steel plate is, for example, embedded in a plastic connection element with its inner ring carrier, and embedded in a plastic bracket with its outer ring carrier.

In a specific embodiment, the centering unit has at least a centering element made of a spring steel plate, a connecting element and a bracket made of plastic. The centering elements can be arranged directly on top of each other. The inner ring carrier or the inner ring carriers are disposed on the plastic connection element, and the outer ring carrier or the outer ring carriers are disposed on the plastic bracket. In a specific embodiment, the inner and outer ring carriers are embedded in the connecting element or the bracket.

A yarn feeding device according to the present invention is designed to feed a yarn to a knitting machine. The knitting machine is a circular knitting machine or a flat knitting machine. Another alternative design of a yarn feeding device according to the present invention is for feeding a weft yarn to a loom.

1‧‧‧ yarn feeding device

2‧‧‧ bracket

3‧‧‧Storage body

4‧‧‧ Fastening device

5‧‧‧ axis

6‧‧‧Driver case

7‧‧‧ Winding element

8‧‧‧Brake body

10‧‧‧ clamping surface

11‧‧‧ Centering element

12‧‧‧ Outer ring carrier

13‧‧‧ spring element

14‧‧‧Inner ring carrier

15‧‧‧ connection point

16‧‧‧ connection point

17‧‧‧Connecting element

17a‧‧‧ cone

17b‧‧‧ extension

18‧‧‧ adjusting element

19‧‧‧ Adjustment bracket

20‧‧‧Brake body ring

20a‧‧‧ cone section

20b‧‧‧ cylindrical section

21‧‧‧ Lead-out ring

22‧‧‧ lead out cylinder

23‧‧‧ lead out bracket

24‧‧‧ leads out of the eye

31‧‧‧centering element

32‧‧‧outer ring carrier

32a‧‧‧ protrusion

32b‧‧‧ anchor

33‧‧‧Spring element

34‧‧‧Inner ring carrier

34a‧‧‧ anchor

35‧‧‧ connection point

36‧‧‧ Connection point

37‧‧‧Connecting element

37a‧‧‧ cone

37b‧‧‧ extension

38‧‧‧Ring bracket

47‧‧‧Connecting components

48‧‧‧ ring bracket

40‧‧‧ Yarn

P‧‧‧ Arrow

V‧‧‧Angle offset

The invention will now be explained in more detail with reference to an example of a schematic illustration in the drawings.

FIG. 1 is a schematic side view of a yarn feeding device according to the present invention. The yarn feeding device has a braking device and a centering unit according to a first example of the present invention. The braking device has a Brake body; Figure 2 is a diagram corresponding to one of Figure 1, in which a section parallel to the axis of the storage body is illustrated in the area of the braking device; Figure 3 is the yarn feeding device in the brake Perspective view in the device area; Figure 4 is a perspective view of a first example single centering element made of plastic; Figure 5 is a perspective view of a second example single centering element made of spring steel; 6 is a cross-sectional view of a single centering element type centering member made of spring steel across FIG. 5; and FIG. 7 is a cross-sectional view of a single centering element type centering member made of spring steel in a third example.

First example

A yarn feeding device 1 for feeding a yarn 40 to a textile machine illustrated in Figs. 1, 2, and 3 appears as a stored yarn feeding device. The yarn feeding device 1 has a bracket 2, a winding unit, a storage body 3, and a braking device, wherein the yarn 40 is drawn out of the storage body by the textile machine, and the braking device is used for adjustment One yarn tension. The textile machine is, for example, a circular knitting machine.

The bracket 2 is provided with a fastening device 4 for fastening the yarn feeding device 1 to the textile machine, for example to a machine ring of the circular knitting machine.

The storage body 3 is designed as a storage drum, which has a shaft 5. The winding unit is arranged at the winding end shown on the top of the figure, and is used for winding the yarn roll, that is, winding the yarn onto the storage body 3. The winding unit is equipped with a driver and a winding element 7, wherein the driver is arranged in a driving casing 6, and the winding element is driven by the driver.

The bracket 2 extends parallel to the axis 5 along the storage body 3. The drive casing 6 is attached to the winding end of the storage body 3.

The braking device for adjusting the yarn tension of the yarn 40 includes a braking body 8 and an adjusting device for the braking body 8. The braking device is disposed downstream from the storage body 3 in the running direction of the yarn, and the braking body 8 is disposed at the lead-out end of the storage body 3.

The brake body 8 is designed as a conical brake body cone that is a conical sleeve, which is made of a plastic and / or a metal, for example. A comparable or similar brake body is described, for example, in International Patent Application No. WO2006 / 045410A1.

The axis of the brake body 8 is substantially identical to the axis 5 of the storage body 3, ie, except for small deviations when lifted by the yarn 40 or when the elastic brake body 8 is deformed, for example. The leading end of the storage body 3 is circular, and forms a ring-shaped clamping surface 10 in a circular area. The brake body 8 projects beyond the clamping surface 10 with its larger diameter. The braking body can press the clamping surface 10 at the lead-out end of the storage body 3 by the adjusting device.

When the yarn 40 is extracted by the textile machine, the yarn 40 runs from the storage body 3 across the clamping surface 10 through the gap between the leading end of the storage body 3 and the brake body 8.

The yarn feeding device 1 includes an axial elastic centering unit, which in this example extends perpendicularly to the shaft 5 of the storage body 3. The centering unit is disposed between the brake body 8 and the adjusting device.

The centering unit in the first example has a centering element 11 illustrated in FIG. 4, which is designed as a single unit consisting of an outer ring carrier 12, a group of 6 spring elements 13, and an inner ring carrier 14. Pieces.

The ring carriers 12, 14 are designed as a ring member having an approximately square cross section. The spring element 13 is designed as an elongated member having a rectangular cross section, and its longer side end extends parallel to a vertical axis passing through the center of the ring carriers 12 and 14. In this example, the longer side ends of the spring element 13 are shorter than the corresponding edges of the ring carriers 12 and 14, that is, the spring elements are narrower and lower than the ring carriers 12 and 14.

Each spring element 13 is curved, and is disposed at the outer and inner ring carriers 12 and 14. The bending spring element 13 here spirally extends from the outer ring carrier 12 to the inner ring carrier 14. A connection point 15 of a spring element 13 on the inner ring carrier 12 is disposed on the inner ring carrier 14 and has an angular offset V of approximately 190 ° from one of the connection points 16. The number of spring elements, that is, six, and the angular offset of these spring elements, that is, approximately 190 °, are selected so that the radial beam intersects a plurality of, in this example, three or four spring elements. The connection points 15, 16 are formed by sections extending at an angle of about 50 °.

A certain group of spring elements 13 of the centering element extends in a certain horizontal plane in a relaxed state, for example, before the brake element is installed in the braking device. This means that the upper edge of the elongated member forming the spring element 13 is arranged on a certain horizontal plane.

A connecting element 17 for buckling the centering element to the brake body 8 is formed on the inner ring carrier 14. The connecting element 17 has a short cone 17a, which tapers toward the inside where it is transformed into a gear-type extension 17b.

The adjustment device includes an adjustment element 18 and an adjustment bracket 19, the adjustment element is connected to the centering unit, and the adjustment element 18 is attached to the adjustment bracket and the adjustment bracket is parallel to the axis of the storage body 3 5 is arranged and displaced on the carriage 2 of the yarn feeding device 1 as indicated by an arrow P.

The outer ring carrier 14 is disposed on the adjusting element 18. The adjusting element 18 includes a ring-shaped element which supports a part of the peripheral region of the outer ring carrier 12, for example, within a range of 120 °. The adjusting element 18 is designed as an annular section, and in this example has a U-shaped cross section around the outer periphery of the outer ring carrier 12.

The brake device includes a brake body ring 20 surrounding the end of the brake body 8 away from the storage body 3. The centering element 11 can be connected to the brake body ring 20 through the connection element 17. In the connected state, the brake body ring 20 is disposed inside the inner ring carrier 14. The brake body ring 20 has a conical section 20a and a cylindrical section 20b, wherein the conical section is opened toward the brake body 8 and the cylindrical section is held away from the brake body 8 by a gear-type extension 17b. The brake body 8 protrudes into a gap between the brake body ring 20 and the inner ring carrier 14. The gear-type extension 17 b of the connecting element 17 allows a clear connection between the centering element 11 and the brake body 8. The brake body 8 extends approximately, and the inner ring carrier 14 is transformed into an area of the connecting element 17. The brake body is held between the ring carrier 14 and the conical section 20a.

In FIG. 2, in addition to the brake body ring 20 having a conical section 20 a and a cylindrical section 20 b, an extraction ring 21, an extraction cylinder 22, an extraction bracket 23, and an extraction eyelet 24 are shown.

Second example

The second example is equivalent to the first example, except for the features described below.

FIG. 5 shows a centering element 31 of a second example, which is formed by a disk made of spring steel. An outer ring section of the disc forms an outer ring carrier 32. Six bridges formed between the spiral extension openings will form six spring elements 33, and an inner ring section forms an inner ring carrier. 34. The spring element 33 extends from a plurality of connection points 35 on the outer ring carrier 32 to a plurality of connection points 36 on the inner ring carrier 34. The angular offset between the connection points 35, 36 of a spring element 33 bis is approximately 190 °.

The outer ring carrier 32 is provided with a plurality of small projections 32a around its outer periphery in the region of the connection point 35. The protrusions serve as an anti-rotation device of the outer ring carrier in the region of the connection point 35. These protruding pieces help to assemble. The outer ring carrier 32 also has a positioning point 32b on its outer periphery, such as a circular notch. It is conceivable that one of the inner ring carriers 34 corresponds to the positioning point 34a, for example, one arranged on the same radial beam. The disc forming the centering element 31 has a height of, for example, 0.2 mm. The opening surrounding the opening of the inner ring carrier 34 and between the spring element 33 and the outer periphery of the outer ring carrier 32 is formed by a stamping process, for example.

FIG. 6 shows the centering element 31 of FIG. 5 in an installed state. The centering device includes a connecting element 37 on an inner ring carrier 34 except for the centering element 31, and a ring bracket 38 on an outer ring carrier 32. The connecting element 37 and the ring bracket 38 are made of plastic.

The connecting element 37 includes a short cone 37a that is tapered toward the inside to transform into a plurality of gear-type extensions 37b. The centering element 31 with its inner ring carrier 34 is embedded in a section designed as a cone 37a. The centering element 31 is embedded in the ring bracket 38 with its outer ring carrier 32. The ring bracket 38 has a height of 4 mm and a thickness of 2 mm. The ring bracket 38 and the connecting element 37 are manufactured during an injection molding process. The outer ring carrier 32 and the inner ring carrier 34 of the centering element 31 are insert-molded here. The positioning points 32b and 34a are used to position the centering element 31 in an injection molding device.

In another option, it is envisaged that there is only one anchor point.

Third example

The third example is equivalent to the second example, except for the features described below. The centering element includes two centering elements 31 of the second example.

FIG. 7 shows the two centering elements 31 in an installed state, wherein the configuration of the two centering elements 31 is not shown to scale. For clarity, the distance between the two centering elements 31 is plotted as the larger one.

In the third example, the two centering elements 31 are directly stacked. The centering elements are inserted into a connecting element 47 with their inner ring carrier 34 and into a ring bracket 48 with their outer ring carrier 34. As in the second example, the connecting element 47 and the ring bracket 48 shown are made of plastic. The ring bracket 48, the two centering elements 31, and the connecting element 47 are manufactured by an injection molding process.

Claims (12)

A yarn feeding device (1) for feeding a yarn (40) to a textile machine, which has a storage body (3), a braking device, and an axial elastic centering unit. The yarn (40) is pulled out from the storage body by the textile machine, the braking device is used to adjust a yarn tension of one of the yarns (40), and the braking device is arranged on the storage body (3) along the yarn path Downstream of the direction, the brake device has a brake body (8) and an adjustment device for the brake body (8), wherein the brake body (8) can be located in the storage body (3) by the adjustment device. A pinching surface (10) is pushed at the lead-out end, wherein the centering unit extends vertically, cylindrically, or conically with respect to the axis of the storage body (3), and is disposed on the braking body (8) and the adjusting device, wherein the centering unit has at least one outer support member, an inner support member, and a set of at least three spring elements (13), wherein the spring elements are arranged outside the and the The inner supporting member and one of the supporting members is arranged on at least one adjusting element of the adjusting device And another support member is arranged on the brake body (8), which is characterized in that the spring elements (13) are designed as slender curved parts, and one of the support members is extended to the other support member in a spiral shape. Wherein, one connection point (15) of the spring element (13) is arranged on the one support member, and the other support member is offset (V) by an angle from the connection point (16). For example, the yarn feeding device of the first patent application range, wherein the angular offset (V) is at least 90 °. For example, the yarn feeding device of the first or the second item of the patent application range, wherein the spring elements (13) of a group of spring elements (13) extend in a relaxed state on a horizontal plane. For example, the yarn feeding device of the first or second scope of the patent application, wherein the centering unit has at least one connecting element (17, 37, 47) for arranging a corresponding support member on the brake body (8) on. For example, the yarn feeding device of the first or second scope of the patent application, wherein the centering unit has at least one bracket (38, 48) for arranging a corresponding support member to at least one adjustment element of the adjustment device (18) on. For example, the yarn feeding device in the scope of patent application item 1 or item 2, where the support members are designed as outer and inner ring carriers (12, 32, 14, 38), where the outer ring carrier (12, 32) is arranged on the adjustment element (18) of the adjustment device directly or by means of the brackets (38, 48), and the inner ring carrier (14, 34) is by means of the connection element (17, 37, 47) and arranged on the brake body (8). For example, the yarn feeding device of the patent application No. 6 wherein the centering unit has at least a centering element (11, 31), which is designed from the outer ring carrier (12, 32) and the group of spring elements (13), and a single piece of the inner ring carrier (14, 34). For example, the yarn feeding device according to claim 7 of the patent application scope, wherein the centering unit has at least two centering elements (11, 31) arranged in an overlapping manner. For example, the yarn feeding device of claim 7 in which the centering element (11) is made of plastic. For example, the yarn feeding device according to item 9 of the application, wherein the centering element (11) is designed as a single piece by the connecting element (17). For example, the yarn feeding device of claim 7 in which the centering element (31) is made of a spring steel. For example, the yarn feeding device of the scope of patent application No. 11, wherein the centering unit has at least a centering element (31) made of spring steel, a bracket (38, 48) made of plastic and a Connection element (37, 47).