US3222731A

US3222731A - Top roller support arrangement for a textile drawing mechanism

Info

Publication number: US3222731A
Application number: US263873A
Authority: US
Inventors: Rolf Kramer
Original assignee: SKF Kugellagerfabriken GmbH
Current assignee: SKF GmbH
Priority date: 1962-03-17
Filing date: 1963-03-08
Publication date: 1965-12-14
Anticipated expiration: 1982-12-14
Also published as: CH401775A; FR1350422A; DE1214121B; GB1015755A

Description

TOP ROLLER SUPPORT ARRANGEMENT FOR A TEXTILE DRAWING MECHANISM Filed March 8, 1963 2 Sheets-Sheet 1 7 K j y I L z v /NVEN70P Dec. 14, 1965 K A E 3,222,731

TOP ROLLER SUPPORT ARRANGEMENT FOR A TEXTILE DRAWING MECHANISM Filed March 8, 1963 2 Sheets-Sheet 2 3,222,731 T]? ROLLER SUPEORT ARRANGEMENT FUR A TEXTILE DRAWING MECHANESM Rolf Kramer, StuttgartJFeuer-bach, Germany, assignor to SKF Kugellagerfabriken Gesellschaft mit beschrankter Haftnng, Stuttgart-Bad Cannstatt, Germany, a company of Germany Fited Mar. 8, 1963, Ser. No. 263,873 (Claims priority, appiication Germany, Mar. 17, 1962, S 78,540 7 Claims. (Cl. 1252) This invention relates to textile spinning machinery, and more particularly to a top roller support arrangement for a drawing mechanism of the type in which several top rollers are mounted on a carrier arm by means of individual brackets, and an apron is trained over one of the top rollers.

In the normal operative position of the top rollers, a common plane tangential to the rollers constitutes the drawing plane in which slivers move. An apron is trained over a first top roller and over an apron cradle for movement of the apron in a path a portion of which extends substantially in the drawing plane toward a second roller. The apron cooperates with a correspondingly mounted bottom roller apron to guide the sliver into the throat formed between the second top roller and a cooperating bottom roller. The sliver moves freely or floats between the forward end of the aprons and the afore-mentioned throat.

For precise control of the drawing operation, it is desirable to keep the distance between the forward apron end and the throat of the second roller as short as possible. When conventional twin rollers are employed in which two cylindrical members connected by a short shaft rotate about the common axis, it is necessary to keep the axes of the first and second twin top rollers parallel in order to hold the free path of the sliver uniformly short with respect to both cylindrical members of each twin roller. At the same time, it is necessary that at least the second top roller be free not only to move toward and away from the drawing plane, but also to pivot or swing about an axis approximately perpendicular to the drawing plane, that is, to pivot in a plane parallel to the drawing plane.

The primary object of the invention is the provision of a top roller support arrangement in which parallel alignment of the first and second top rollers is safely and precisely maintained even when the second roller pivots about the referred to perpendicular axis so as to make the length of the floating sliver portion uniform and as short as possible.

With this and other objects in view, the invention provides motion transmitting means which connect the first and second rollers for joint pivotal movement about the respective axes which are perpendicular to the drawing lane.

p Other features and many of the attendant advantages of this invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings in which like reference numerals designate like parts throughout the figure thereof, and wherein:

FIG. 1 shows a portion of a drawing mechanism according to the invention in side elevation, a part of a supporting arm being broken away for a better view of internal elements;

FIG. 2 shows elements of the apparatus of FIG. 1 in front elevational section on the line IIII;

FIG. 3 shows a modification of the apparatus of FIG. 1 in a corresponding View; and

nited States Patent 0 M 3,222,731 Patented Dec. 14, 1965 FIG. 4 is a front-elevational sectional view of the apparatus of FIG. 3 taken on the line IV-IV.

Referring now to the drawings in detail, and initially to FIGS. 1 and 2, there is seen an elongated carrier arm 1 on which the top rollers are supported. Only the front end of the arm 1 is shown, and it will be understood that the rear end of the arm is mounted on the stationary frame of a spinning machine in the usual manner, and that the arm may be locked in the operative position illustrated in FIG. 1. As clearly seen in FIG. 2, the arm 1 has the cross sectional shape of a downwardly open U-channel.

A transverse pin 2 is mounted between the two flanges of the arm 1, and the hook-shaped rear terminal portion 17 of a bracket 3 is looped over the pin 2. As seen in FIG. 2, the bracket portion 17 has the shape of a flat elongated strip having a longitudinal center rib of arcuate cross section. The bracket portion 17 thus is capable of pivotal movement about the axis of the pin 2, and of limited pivotal movement about a vertical axis.

The front terminal portion 4 of the bracket 3 has the shape of a downwardly open U-channel. Conforming recesses in the two flanges of the terminal portion 4 provide bearings in which the central shaft 5 of a twin roller 6 is journaled. The roller 6 constitutes the discharge or second member of the top roller arrangement. In cooperation with a bottom roller 9 it discharges a sliver 7 from the drawing mechanism. Since the bottom roller arrangement is not directly relevant to this invention, and may be entirely conventional, it has not been shown in detail, but it will be understood that the bottom rollers are mounted on the stationary machine frame and are driven. A spring 8 urges the bracket 3 downwardly away from the arm 1, and a stop It) on the bracket cooperates with a projecting portion of the arm 1 to limit the downward movement of the bracket 3.

A first top roller 6 which is first in the direction of sliver movement is mounted on the arm 1 by means of a sleeve 10. The sleeve conforms to a portion of the inner wall of the arm 1, and is longitudinally slidable within the arm. A set screw 11 threadedly engages the sleeve 10 and passes through a longitudinaly slot in the arm 1. This slot permits longitudinal adjustment of the position of the sleeve 10. A transverse pin 2 in the sleeve 10 carries the rear terminal portion 17' of a bracket 3'. The front terminal portion 4' of the bracket 3 provides bearings for the shaft 5 of the twin roller 6. The configuration of the rear terminal portion 17 of the bracket 3' is similar to that of the terminal portion 17 so that the bracket 3' is pivotable not only toward and away from the normal path of the sliver 7 in the drawing plane, but also movable about a vertical axis passing through the center of the pin 2'. A helical spring 8' mounted within the arm 1 urges the bracket 3 toward the drawing plane and a cooperating bottom roller 9'. A stop 10" engages a projecting portion of the arm 1 to limit movement of the bracket 3 under the urging of the spring 8'.

A top apron 12 is trained over each of the cylindrical members of the rop roller 6' and over the front part of an apron cradle 13. The rear part 16 of the cradle 13 conformingly engages the shaft 5 of the first roller 6'. The top apron 12 cooperates with a corresponding bottom apron 14 trained over the bottom roller 9 and a bottom apron bar guide 15 in the usual manner.

The embodiment of the invention illustrated in FIGS. 3 and 4 is identical with that shown in FIGS. 1 and 2 except for a differently mounted top apron cradle 13. The front end 16' of the cradle is hooked over the shaft 5 of the second roller 6 whereas the rear end of the cradle guides the front portion of the aprons 12.

In the normal position of the top roller arrangement shown in FIGS. 1 and 3, the pins 2, 2' are mounted almost in a common vertical plane, and the vertical and parallel pivoting axes of the

brackets

3, 3 are therefore so closely adjacent each other that they practically coincide. The bracket 3 is very much longer than the bracket 3'. A central portion of the bracket 3 has lateral flanges 3" by means of which the bracket 3 straddles the bracket 3. Corresponding lateral portions 311 of the bracket 3 and the flanges 3" are in sliding contact with each other, and partly conform to each other in all relative positions of the brackets that may be provided by the adjusting movement of the sleeve in the arm 1. The abutting engagement of the two flanges 3 with corresponding portions 3a of the bracket 3 couples the two brackets so that one cannot move about its vertical pivot axis without taking the other along in a corresponding pivoting movement. Yet, the brackets 3, 3' may independently move about the pin 2 and 2', respectively, toward and away from the drawing plane or the corresponding bottom roller. The flanges 3" of the bracket 3' and the corresponding portions 3a of the bracket 3 act as motion transmitting or abutment means and are referred in the claims as abutment means. In the embodiments selected for illustration, the flanges 3" and the portions 3a are shown to be integral portions of the bracket 3' and 3, respectively.

The horizontal spacing of the pins 2, 2' in all adjusted positions of the sleeve 10 on the arm 1 is but a very small fraction of the horizontal length of the bracket 3', and an even smaller fraction of the horizontal length of the bracket 3. The angle of possible pivoting movement of the

brackets

3, 3 in a horizontal plane parallel to the drawing plane is relatively small. The axes of the rollers 6, 6' are therefore practically parallel in all operative positions of the top roller arangements shown in the drawings. The axes of rotation of the rollers 6, 6 are originally parallel, and the axes of the pins 2, 2' may be precisely arranged in a common vertical plane by loosening the screw 11, and slightly shifting the sleeve 10 rearward from the position shown in FIGS. 1 and 3. The apparatus when so adjusted maintains precisely parallel alignment of the rollers 6, 6 regardless of the pivoting angles of the brackets about their vertical axes. The apparatus of the invention thus ensures practically uniform or precisely uniform minimum spacing between the front ends of the

aprons

12, 14 and the throat of the rollers 6, 9.

The relatively great length of the bracket 3 causes the bracket to swing about its vertical axis very quickly in response to the movement of the drawn sliver into a position in which the top rollers are parallel to the cooperating bottom rollers. The motion transmitting connection between the two rollers 6, 6 causes the apron to participate in this quick adjusting motion.

In other respects the apparatus illustrated operates in a manner known to those skilled in the art and not requiring further description. The lever 18 mounted on the arm 1 permits the arm to be swung away from the bottom rollers for maintenance work, as is conventional.

It should be understood, of course, that the foregoing disclosure relates to only preferred embodiments of the invention, and that it is intended to cover all changes and modifications of the examples of the invention herein chosen for the purpose of the disclosure which do not constitute departures from the spirit and scope of the invention set forth in the appended claims.

What is claimed is:

1. In a top roller arrangement for a textile drawing mechanism,

(a) an elongated carrier arm,

(b) two bracket members, and

(c) a first and a second roller, each of said rollers being mounted on one of said bracket members for rotation about an axis extending perpendicularly to the direction of elongation of said arm, each of said bracket members being mounted on said arm for independent pivoting movements toward and away from a common plane tangential to both of said rollers, and for swinging movements substantially parallel to said plane about a pivoting axis substantially perpendicular to said plane, each of said bracket members being provided with abutment means, the abutment means of both of said bracket members engaging each other for transmitting any swinging movement of one of said bracket members to the other bracket member.

2. In the arrangement according to claim 1, the abutment means of said bracket members engaging each other in a direction substantially parallel to said plane and, thus, keeping said axes of rotation substantially parallel during a joint swinging movement.

3. In the arrangement according to claim 1, cradle means between said rollers and supported by one of said rollers to take part in joint swinging movements of both of said bracket members, and drawing apron means trained over said cradle means and one of said rollers.

4. In the arrangement according to claim 1, the abutment means of one of said bracket members straddling the abutment means of the other bracket member.

5. In the arrangement according to claim 1, each of said bracket members being elongated and having a first terminal portion pivotally secured to said arm and a second terminal portion having one of said rollers rotatably mounted thereon, the abutment means of said bracket members being provided intermediate said first and second terminal portions.

6. In an arrangement as set forth in claim 1, said pivoting axes being closely adjacent each other and substantially parallel to each other.

7. In a top roller arrangement for a drawing mechanism, in combination:

(a) a support;

(b) first and second bracket means mounted on said support;

(c) a first and second top roller, said rollers normally defining a drawing plane;

(d) bearing means provided on each of said bracket means for rotatably receiving said first and second roller, respectively;

(e) cradle means mounted between said rollers and supported by one of said rollers;

(f) an apron trained over said first roller and said cradle means and defining a path in said drawing plane;

(1) each of said bracket means being mounted to pivot about a first axis substantially parallel to said drawing plane toward and away from said drawing plane, and to swing about a second axis substantially perpendicular to said drawing plane; and

(g) abutment means provided on said bracket means for mutual engagement of said bracket means and causing joint movements of said bracket means and cradle means about said second axes.

References Cited by the Examiner UNITED STATES PATENTS 2,708,290 5/1955 Neu et al. 2,746,095 5/1956 Dausch 19280 2,758,340 8/1956 Anderson 19282 3,021,574 2/1962 Dausch et al. 19282 3,050,789 8/1962 Rogner 19252 DONALD W. PARKER, Primary Examiner.

Claims

1. IN A TOP ROLLER ARRANGEMENT FOR A TEXTILE DRAWING MECHANISM, (A) AN ELONGATED CARRIER ARM, (B) TWO BRACKET MEMBERS, AND (C) A FIRST AND A SECOND ROLLER, EACH OF SAID ROLLERS BEING MOUNTED ON ONE OF SAID BRACKET MEMBERS FOR ROTATION ABOUT AN AXIS EXTENDING PERPENDICULARLY TO THE DIRECTION OF ELONGATION OF SAID ARM, EACH OF SAID BRACKET MEMBERS BEING MOUNTED ON SAID ARM FOR INDEPENDENT PIVOTING MOVEMENTS TOWARD AND AWAY FROM A COMMON PLANE TANGENTIAL TO BOTH OF SAID ROLLERS, AND FOR SWINGING MOVEMENTS SUBSTANTIALLY PARALLEL TO SAID PLANE ABOUT A PIVOTING AXIS SUBSTANTIALLY PERPENDICULAR TO SAID PLANE, EACH OF SAID BRACKET MEMBERS BEING PROVIDED WITH ABUTMENT MEANS, THE ABUTMENT MEANS OF BOTH OF SAID BRACKET MEMBERS ENGAGING EACH OTHER FOR TRANSMITTING ANY SWINGING MOVEMENT OF ONE OF SAID BRACKET MEMBERS TO THE OTHER BRACKET MEMBER.