Title of Invention

DRAFTING ROLLERS FOR A SPINNING FRAME

Abstract

Drafting rollers (10) for a spinning frame with at least one cylinder pair (14) and a second cylinder pair (16), between whose cylinder pairs of roving yarn (2) is drawn, wherein at least one drivable cylinder pair is operationally linked with the fiber structure of a roving yarn (2) to be drawn by aprons (122, 124), wherein the first cylinder pair (14) consists of a first drafting cylinder (144), against which a first top roller (142) is pressed, and accordingly, the second cylinder pair (16) has a second drafting cylinder (164) along with a second top roller (162) pressed against it, and wherein one apron each are routed via the cylinders of the first cylinder pair (14), i.e., the first drawing cylinder (144) and the first top roller (142), namely the bottom apron (124) and the top apron (122), whereby in addition to a frictionally engaged driving cylinder (144) of a cylinder pair (14), another drive element is provided to avoid slippage between a drawing cylinder (144) and an apron (124), characterized in that an apron, in particular the bottom apron (124), is perforated, and mold elements (185) are secured to a first drawing cylinder (144) or to an additional drive cylinder (184), engaged via holes in the perforation.

Full Text

The invention relates to drafting rollers for a spinning frame with at least one cylinder pair and a second cylinder pair, between whose cylinder pairs a roving yarn is drawn, wherein at least one drivable cylinder pair is operationally linked with the fiber structure of a roving yarn to be drawn by aprons, wherein the first cylinder pair consists of a first drafting cylinder, against which a first top roller is pressed, and accordingly, the second cylinder pair has a second drafting cylinder along with a second top roller pressed against it, and wherein one apron each are routed via the cylinders of the first cylinder pair, i.e., the first drawing cylinder and the first top roller, namely the bottom apron and the top apron, whereby in addition to a frictionally engaged driving cylinder of a cylinder pair, another drive element is provided to avoid slippage between a drawing cylinder and an apron, applicable in machines with International Classification D 01 H-l/22. among others. Multi-cylinder drafting rollers have proven effective in the fabrication of yarns, wherein the fiber structure are routed through aprons at least in segments between the cylinder pairs. The drafting roller cylinders drive the aprons directly or indirectly via frictionally engaged connections, so that a certain slippage must be contended with in practice. Drafting rollers with which the invention can be implemented are described in greater detail in US Specification 3,167,820. Under unfavorable conditions, when slippage exceeds a permissible level, the drafting process can become disrupted. An additional drive is disclosed in GB 506713. In GB 1184787 an apron and a cylinder have toothed surfaces to reduce slippage. The object of the present invention is to improve the drive conditions. The object is achieved with drafting rollers or a spinning frame with the features as described herein. The advantageous further developments are also described herein. In the following, the invention shall be explained in detail based on figure 1 of the accompanying drawing. The essential feature of the invention is characterized by an apron, in particular the bottom apron 124, is perforated, and mold elements 185 are secured to a first drawing cylinder 144 and/or to an additional drive cylinder 184, engaged via holes in the perforation of the apron. This apron is involved in the drafting process in the drafting rollers with a drafting cylinder. This makes the drafting of the fiber structure more uniform. The embodiment according to figure 1 diagrammatically depicts drafting rollers 10 with a first cylinder pair 14 and a second cylinder pair 16, wherein the primary drafting zone 12 is indicated between these cylinder pairs. The first cylinder pair 14 consists of a first drafting cylinder 144, against which a first top roller 142 is pressed. Accordingly, the second cylinder pair 16 has a second drafting cylinder 164 along with a second top roller 162 pressed against it. One apron each are routed via the cylinders of the first cylinder pair 14, i.e., the first drawing cylinder 144 and the first top roller 142, as denoted in the figure with bottom apron 124 and top apron 122. An additional cylinder pair can precede the first cylinder pair 14 in the direction of flow of the roving yarn 2 from the top down, wherein the pre-drawing zone lies between the preceding cylinder pair (not shown) and the first cylinder pair 14. Instead, the embodiment shown on the figure depicts only a first deflection 202 and a second deflection 204, which are generally referred to as the brake 20. A capacitor 8 can be situated in front of the preceding cylinder pair, basically similar to the two deflections 202, 204, or as depicted in front of the first cylinder pair 14, in order to route the bundled fibers to the respective cylinder pair. To improve the traction ofthe bottom apron 124, an additional drive element is provided in the form of a drive cylinder 184. To provide the bottom apron 124 with a defined initial stress, and hence to ensure a controlled, frictionally engaged connection between the cylinders 144 and 184 and the bottom apron 124, a loading device 186 for the apron must be set up, advantageously by the drive cylinder 184. The loading device 186 presses a tension roller 182 against the bottom apron 124, wherein the loading device 186 also can cause the tension roller 182 to press against the drive cylinder 184. In the figure, the tension roller 182 and drive cylinder 184 are jointly referred to as a third cylinder pair 18. To increase the operational safety, or as an alternative to the additional drive cylinder 184, the bottom apron 124 can be provided with a perforation, wherein mold elements 185 engage this perforation, for example at the first drawing cylinder 144 and/or at the drive cylinder 184, thereby ensuring that the bottom apron 124 is frictionally engaged and entrained by the first drawing cylinder 144 or drive cylinder 184. If the additional drive elements 185 are directly secured to the first drawing cylinder 144, the additional drive cylinder 184 and tension roller 182 can be omitted, and replaced by a pure tension element. It is understood that the mold elements 185 must be attached laterally, outside the running zone of the roving yarn 2, and next to the top roller 142 on the drawing cylinder 144. The additional drive elements, i.e., the additional drive cylinder 184 and/or the mold elements 185, ensure that no impermissible slippage takes place between the drive elements and the bottom apron 124. The reeled-in yarn 4 exiting the second cylinder pair 16 is wound on a yarn carrier by a spinning frame 6, in particular a ring spinning frame. The additional drive cylinder 184 can be provided with a special, separate drive. A preferably pneumatic compressor device can be hooked up to the drafting rollers, in which the still reeled-in fiber structure is routed by a moving, perforated flat part, which is suctioned in a narrow area on the side facing away from the fiber structure. Cylinders 144, 184 of the drafting rollers can be driven by individual motors, or via the gearing of a shared motor. WE CLAIM 1. Drafting rollers (10) for a spinning frame with at least one cylinder pair (14) and a second cylinder pair (16), between whose cylinder pairs a roving yarn (2) is drawn, wherein at least one drivable cylinder pair is operationally linked with the fiber structure of a roving yarn (2) to be drawn by aprons (122, 124), wherein the first cylinder pair (14) consists of a first drafting cylinder (144), against which a first top roller (142) is pressed, and accordingly, the second cylinder pair (16) has a second drafting cylinder (164) along with a second top roller (162) pressed against it, and wherein one apron each are routed via the cylinders of the first cylinder pair (14), i.e., the first drawing cylinder (144) and the first top roller (142), namely the bottom apron (124) and the top apron (122), whereby in addition to a frictionally engaged driving cylinder (144) of a cylinder pair (14), another drive element is provided to avoid slippage between a drawing cylinder (144) and an apron (124), characterized in that an apron, in particular the bottom apron (124), is perforated, and mold elements (185) are secured to a first drawing cylinder (144) or to an additional drive cylinder (184), engaged via holes in the perforation. 2. Drafting rollers as claimed in claim 1, wherein guides (202, 204) preceding the first cylinder pair (14) for the roving yarn (2). 3. Drafting rollers as claimed in claim 2, wherein the guides are a brake (20) consisting of a first deflection (202) and a second deflection (204). 4. Drafting rollers as claimed in claim 2 or 3, wherein the preceding guides consist of a preceding cylinder pair (202, 204) and/or a condenser (8). 5. Drafting rollers as claimed in any one of the preceding claims, wherein a loading device (186) for the bottom apron (124) is arranged. 6. Drafting roller as claimed in claim 5, wherein a tension roller (182) on the loading device (186) is arranged. 7. Drafting rollers for a spinning frame as claimed in any one of the preceding claims, wherein a spinning frame unit (6) for the yarn (4) is arranged following the second cylinder pair (16). 8. Drafting rollers as claimed in any one of the preceding claims, wherein an additional drive cylinder (184) is provided for the apron, which is connected with a drive. 9. Drafting rollers as claimed in any one of the preceding claims, wherein a particular pneumatic compressor device is arranged, preferably with a ring spinning frame (6).

Documents:

0213-mas-2001 others.pdf

0213-mas-2001 petition.pdf

0213-mas-201 abstract duplicate.pdf

0213-mas-201 claims duplicate.pdf

0213-mas-201 description (complete) duplicate.pdf

213-mas-2001- abstract.pdf

213-mas-2001- claims.pdf

213-mas-2001- correspondence others.pdf

213-mas-2001- correspondence po.pdf

213-mas-2001- description complete.pdf

213-mas-2001- drawings.pdf

213-mas-2001- form 1.pdf

213-mas-2001- form 18.pdf

213-mas-2001- form 26.pdf

213-mas-2001- form 3.pdf

213-mas-2001- form 5.pdf