US3044733A - Brake arrangement - Google Patents

Description

y 1952 R. M. INGHAM, JR 3,044,733

BRAKE Filed May 2, 1958 INVENTOR. ROBERT M. INGHAM,JR.

BY W22 aw ATTORNEY United States Patent 3,044,733 BRAKE ARRANGEMENT Robert M. Ingham, Jr., Spartanburg, S.C., assignor to Deering Millikan Research Corporation, Pendleton, S.C., a corporation of Delaware Filed May 2, 1958, Ser. No. 732,472 Ciaims. (Cl. 242129.8)

This invention relates to winding of textile yarns, and more particularly to an improved brake arrangement for swing-arm-mounted cylindrical winding drums or rolls having their outer unsupported end open.

A conventional multi-package winding apparatus, such as that known as the Abbott winder, employs a winding roll or drum for a yarn package which is surface driven by frictional contact with a drive roll rotated at a desired peripheral speed, the take-up winding roll being mounted on a pivoted swing arm which is in one angular position for engagement of the package with the drive roll and is angularly swung about its pivot axis to a second position at various times during the winding process and upon completion of the winding of the package. In the movement of the winding drum and yarn package from the driven position to this second position it is desirable to provide braking means for retarding rotation of the takeup roll and package, and it is further of utmost importance to prevent the take-up roll and package from rotating in an unwinding direction after reaching this second pivoted position, particularly inasmuch as the yarn tails resulting from such unwinding action may easily become entangled with other adjacent packages which are being wound and cause ends down at the adjacent packages and much wild yarn. One cause of such reverse or unwinding rotation of the take-up rolls and yarn packages thereon appears to be that of vibration of the take-up roll and package thereon as a result of conventional operation of the apparatus.

A further important aspect of this problem is the fact that at both ends of the winding frame, which has a plurality of individual winding positions progressed along the length of the frame in a continuous manner, a set of preliminary drive rolls are provided to impinge against the surface of the yarn package while it is in the restive or quiescent position. These preliminary drive rolls contact the package in such a manner as to impart a slow rotation thereto in order to take up the slack in the yarn between the supply bobbin and the yarn package prior to the reengagement of the yarn package with the take-up drive roll.

While brakes have been proposed for solving this problem, such previous brake arrangements have not been entirely satisfactory for various reasons, including difiiculty of installation and servicing and the necessity of new modified elements to replace existing take up roll and swing arm assembly parts as now employed in conventional winders of this type. Accordingly, it is a major feature of this invention to provide an improved brake arrangement which is particularly adaptable to present conventional package holding take-uprolls which are mounted on a pivoted swing arm and which have an open outer end, and which brake arrangement is readily installed and easily serviced by virtue of its ready accessibility and simplicity of arrangement, as well as being readily usable on existing take-up roll and support arm assemblies without necessitating extensive modifications or replacements of the existing parts.

Still other objects, features and attendant advantages will become apparent to those skilled in the art from a reading of the following detailed description of a preferred embodiment constructed according to the invention, taken in conjunction with the accompanying drawings wherein:

ice

FIGURE 1 is a schematic view in perspective of a preferred physical embodiment according to the invention. FIGURE 2 is a partial rear view in perspective of the embodiment of FIGURE 1.

FIGURE 3 is a schematic end view illustrating the position "of the braking arrangement with the take-up roll in normal winding position.

FIGURE 4 is a schematic end view of the braking apparatus illustrating the braking arrangement in braking position upon pivotal movement of the swing arm.

FIGURE 5 is a diametral section view taken on line 5-5 of FIGURE 3.

Referring now to the figures of the drawing, a conventional cylindrical winding roll or drum 11 is freely rotatably mounted on a shaft 13 fixedly removably secured in a transverse bore 15 formed in a transverse cylindrical boss 17 on the extreme outer free end of a swing arm 19 which in turn is pivotally mounted on a suitable pivot shaft 21 remote from the axis of the winding drum 11. In the horizontal position of the swing arm 19 the winding roll 11 is in the winding position (as shown in FIGURE 2 and in solid lines in FIGURE 1) wherein a peripheral drive roll 23 serves to rotatably drive a yarn take-up package 25 for yarn which passes from a supply source (not shown) beneath the drive roll 23 and through a traverse guide 27 to the take-up package 25 mounted on the winding roll or drum 11.

As in conventional practice the winding drum 11 has a closed end 29 adjacent the swing arm and an open hollow opposite end 31. An intermediate webplate 33 is suitably secured as by welding to a cylindrical sleeve 35 extending through and between the web plate 33 and the closed end 29' of the drum. The winding drum 11 has formed in its periphery adjacent the closed end thereof a plurality of slots 37 in which are mounted a corresponding plurality of spring fingers 39 mounted in cantilever manner on the closed base end section 29 of the winding roll as by screws 41. The spring fingers 39 ex tend outwardly through and beyond the slots 37 to frictionally engage and aid in the retaining of a take-up package carrier tube on the winding drum 11.

The support shaft for the winding drum is fixedly removably secured in the bore 15 formed in the cylindrical boss 17 on the swing arm 19 as by a set screw 43. Winding roll 11 is freely rotatably mounted on the shaft 13 through the medium of a pair of journal bearings, one bearing 45 being press fitted within the outer end of the tubular sleeve 35 forming a part of the winding roll or drum, and the other journal bearing 47 being press fitted within a recess in the face of the boss 17 on the swing arm 19.

The winding drum has in its open hollow outer end an internal brake arrangement, generally indicated at 49, which is mounted on the shaft and which serves to brake the movement of the winding roll or drum when the swing arm is in the vertical position as shown in FIGURE 3,-

but exerts no braking action on the roll when the winding roll assembly is in the winding position as shown in FIG- URE 2. The braking arrangement takes the form of a self acting unidirectional brake arm or shoe 51 which substantially positively prevents rotation of the roll 11 in the counter-clockwise direction as viewed in FIGURE 3 while lightly braking the clockwise rotation of the roll 11 when in this position.

In accordance With the invention brake arm or shoe 51 formed either entirely of resilient high. friction material or having its effective braking surface 51a formed thereof, is eccentrically mounted for pivotal movement on an eccentric stub shaft 53 which is in turn suitably secured as by a press fit, welding, etc., to a support bracket or arm '55 fixedly secured as by a press fit onto a reduced end 13a of the shaft 13. A thrust bearing washer 57 may suitably be provided between the adjacent surfaces of the eccentric brake arm support bracket 55 and the sleeve and journal bearing 45. In order to provide for most advantageous free pivotal movement of the rubber brake arm 51 on the stub shaft 53, a metal bushing 59 is suitably secured as by a press fit in an aperture in the brake arm for free angular movement on the eccentric stub shaft 53. A pair of retainer spring clips 61 serve to retain the brake arm or shoe 51 on the eccentric stubshaft.

The eccentric brake support bracket 55 and stub shaft 53 are positioned such that the stub shaft 53 is above the axis of rotation of the roll 11 as formed by the shaft 13 when the roll 11 is in winding position, thereby effectively holding the rubber brake arm 51 out of engagement with the inner peripheral wall surface of the roll or drum 11. A stop pin 63 is formed or suitably mounted on the support bracket 55 in order to prevent accidental movement of the brake arm 51 into engagement with the drum wall during and upon the winding drum being lowered to the driving or winding position.

Upon raising of the roll assembly to the position where the roll is not being driven, as shown in FIGURE 3 and indicated in broken lines in FIGURE 1, the brake arm 51 will pivot under its own weight to a position of engagement between its arcuate braking surface 51a and the inner annular wall surface of the outer free end of the winding drum 11. Thus, in this position the winding drum 11 will be lightly braked in the clockwise direction and will be heavily braked against rotation in the counter clockwise direction. This is particularly advantageous in this Abott winder type of arrangement since it is desirable to relatively slowly brake a rotation of the package on the take-up drum when the swing arm is raised from its winding position, whereas it is also desirable to permit positive driving of this roll or drum and package in the clockwise direction as occurs during the passage of each winding position past the two opposite end sections of the multiposition winding machine and immediately preceding movement of the swing arm to the winding position. On the other hand it is of considerable importance that the winding roll be braked against unwinding rotation (which is counter clockwise rotation as viewed in these figures) while in the raised non-winding position in order to prevent the yarn end from unwinding from the package and being caught in the moving parts of the apparatus or becoming entangled with the yarn being wound on adjacent winding positions and thereby causing a number of ends down and considerable wild yarn.

It will be apparent from the foregoing description that my invention provides an improved braking arrangement for a two position take-up roll or drum assembly, which is not only advantageous in that it provides the desired braking effect on the take-up roll, but also in that the elements of the braking arrangement are simple and may be easily installed and serviced particularly as a result of their open accessibility at the free end of the take-up roll. Further, it will be seen that the invention is readily adaptable to conventional take-up assemblies of the type described without necessitating extensive changes or replacements of the presently employed commercial parts.

While I have described a preferred illustrative embodiment constructed according to the invention it will be apparent that various minor modifications may be made therein without departing from the scope and spirit of the invention. It is therefore to be understood that the invention is not to be limited by the specific illustrative 4- embodiment but only by the scope of the appended claims.

That which is claimed is:

1. In a bobbin winder arrangement having a transverse swing arm pivotally movable through an are about a pivot axis, a bobbin-holding drum rotatably mounted on a shaft substantially parallel to said pivot axis and fixedly secured at one end on the outer end of said arm, said drum having a hollow cylindrical opening in its outer end remote from said swing arm and said shaft extending into said hollow opening, the improvement comprising a brake arm pivotally carried in eccentric relation by said shaft adjacent its outer free end and within said hollow cylindrical opening.

2. In a bobbin winder arrangement having a transverse swing arm pivotally movable through an are about a pivot axis, and a bobbin-holding drum rotatably mounted on a shaft substantially parallel to said pivot axis and fixedly secured at one end on the outer end of said arm, said drum having a hollow cylindrical opening in its outer end remote from said swing arm and said shaft extending into said hollow opening, the improvement comprising a brake arm pivotally carried in eccentric relation by said shaft adjacent its outer free end and within said hollow cylindrical opening, a bracket member fixedly secured on the outer free end of said shaft and extending transversely of said shaft axis, said brake arm being pivotally mounted on said bracket member.

3. The improvement according to claim 2 further comprising a stub shaft mounted on said bracket member and being disposed eccentrically of the axis of rotation of said drum about said first mentioned shaft, said brake arm being freely pivotally mounted on said stub shaft.

4. The improvement according to claim 3 further comprising a stop pin disposed on said bracket member and extending into the path of movement of said brake arm about its eccentric pivot axis said pin being effective only as said arm moves in an arcuate direction away from said swing arm axis.

5. In a bobbin winder arrangement having a transverse swing arm pivotally movable through an are about a pivot axis, and a bobbin-holding drum rotatably mounted on a shaft substantially parallel to said pivot axis and fixedly secured at one end on the outer end of said arm, said drum having a hollow cylindrical opening 7 in its outer end remote from said swing arm and said shaft extending into said hollow opening, the improvement comprising a brake arm pivotally carried in eccentric relation by said shaft adjacent its outer free end and within said hollow cylindrical opening, said brake arm being formed of a relatively resilient high friction material and further comprising a relatively low friction journal hearing press fit into said brake arm, an eccentric brake arm support shaft supported in fixed relation on an eccentric support fixed on the outer free end of said shaft, said journal bearing being freely mounted on said support shaft.

References Cited in the file of this patent UNITED STATES PATENTS 795,035 Hastreiter July 18, 1905 2,311,175 Hitt Feb. 16, 1943 2,401,725 Elvin June 11, 1946 2,442,211 v Rice May 25, I948 FOREIGN PATENTS 947,451 France July 4, I949

Images