US2109543A - Automatic tension device for bobbins - Google Patents

Description

J; v. MANN 2,109,543

March 1, 1938.

I AUTOMATIC TENSION DEVICE FOR BOBBINS Filed May 16, 1935 INVENTOR.

BY I. /7 Zcmn/ ATT RNEY.

Patented Mar. 1, 1938 UNITED STATES PATENT OFFICE AUTOMATIC TENSlON DEVICE FOR nonams tion of New York Application May 16, 1935, Serial No. 21,857

2 Claims.

The present invention relates to an automatic tension device for bobbins and more particularly an automatically variable retarding device for bobbin holders used in spinning frames and the 5 like.

In the various operations of manufacture and handling yarn or other textile material in which the material is handled in package form, it is desirable that the tension on such material be ac- ,0 curately controllable at all times, and that a high degree of uniformity of tension be obtainable regardless of the diameter or weight of the package.

Moreover, whereas a low tension is desirable as permitting the use of less twist and a correspondl5 ing increase of draft, without danger of breakage,

on the other hand it is necessary to avoid overrunning of the package so as to produce slack. This overrunning of the package may occur in case of breakage, and in some installations by vibration of the frame, also by the use of air blasts to clean the machines.

It is an object of the present invention to provide a novel retarding device for packages of yarn or other wound textile material which is efiective and reliable in operation and simple and economical in construction.

It is another object to provide such a device which is automatically variable in its eifect in accordance with the diameter of the package.

It is a further object to provide such a device which is readily adjustable and adaptable to various types of installations and conditions.

It is a further object to provide such a device which may be arranged to provide substantial 35 uniformity of tension throughout the unreeling of a package, or may be arranged to gradually vary such tension in any desired manner.

Further objects and advantages will be apparent from the following description taken in connection with the accompanying drawing in which:

Fig. 1 is a side view of a preferred embodiment of the invention;

Fig. 2 is a plan view of the sameon a reduced scale; and

Fig. 3 is a side view on a further reduced scale of the device applied to a conventional skewer mounted bobbin. I

Referring first to Fig. 1 of the drawing, there 50 is illustrated a portion of a package I of yarn or roving which is pendulously supported from a creel board 2 by means of an anti-friction bobbin holder 3 of a well-known commercial type.

In this installation the bobbin 4 is supported by 5 the bobbin holder 3 with freedom for limited universal movement, the bobbin holder 3 being attached rigidly to the creel board 2 by means of a bolt 5 traversing an opening in the creel board and secured thereto by means of a nut i. It will be understood that tightening the nut 6 clamps 6 the creel board 2 between the nut 6 and the dust cap I of the bobbin holder.

According to the present invention, a weighted retarding membenin the form of a smooth bar I of suitable material such as steel which is prefi0 erably provided with a polished coating such as chrome or cadmium plate, is arranged to bear frictionally on the periphery of the yarn package I. For this purpose the bar 8 is pivotally connected, at one end as indicated at 9 to a mounting 16 member II in the form of a wire which is bent upon itself so as to embrace the bolt 5 of the bobbin holder, and is provided with inturned ends l2 pivotally engaging an opening l3 in the end of the bar 8 (Fig. 2).

The mounting member II is clamped between the dust cap I of the bobbin holder and. the creel board, a suitable washer l4 being preferably interposed adjacent the creel board; and provision for longitudinal adjustment of the retarding mem- 5 her 8 is made by forming the mounting member H as an elongated loop which, when the nut 6 is loosened, permits the pivot 9 of the retarding member to be moved toward or away from the vertical axis of the yarn package.

During the unreeling operation, it is well known that in some installations the tension on the yarn is considerably less when the yarn package is full than when the bobbin is nearly empty, since the radius from the surface to the axis of the full yarn package is greater and the draft of the yarn consequently has a greater leverage to turn the bobbin. This is true even though there is somewhat more friction in the bobbin holder due to the weight of the full package, especially where 40 anti-friction bobbin holders are used in which the friction is at all times quite low. An analogous effect is also observable with respect to disturbances caused by air blasts used for cleaning purposes, which disturbances will obviously be greater as regards undesired rotation of the yarn packages when the packages are full. It is desirable, therefore, that a retarding means be provided which produces a comparatively large braking eifect on a full package, which braking effect diminishes progressively as the diameter of the package diminishes.

In operation, the above-described structure accomplishes this desired function in an effective manner. Since the retarding element ,8

effectiveness is obviously greatest when the package is full, and least when the package is exhausted as illustrated in dotted lines in Fig. 1. Moreover, it will be readily apparent that the relative braking effect exerted by the retarding .member on packages of varying sizes may be easily and positively controlled by moving the pivot 9 of the retarding member toward or away from the axis of the package. The pivot 9 may also be moved vertically by bending the supporting element ll if desired, whereby practically any desired variation in braking eflfect may be secured. Thus, moving the pivot 8 toward the axis of the yarn package or lowering the pivot decreases the variation in braking eifect while moving the pivot outward, or raising it will increase the variation in braking efiect.

It will be appreciated that the retarding element 8, due to its suitable curvature, does not interfere in any way with the mounting or dismounting of the yarn packages on the bobbin holder, and that the weight of the retarding member 8 is selected or adjusted to produce the desired efl'ect in each type of installation in which it is adopted.-

Fig. 3 illustrates the invention as used in connection with an ordinary skewer-mounted yarn package l5. In this case the bobbin I6 is mounted on a skewer I'I which rests at its lower end in a suitable bearing I! on the lower creel board, and is guided at its upper end by a bearing thimble I! mounted in the upper creel board 2|. The bearing thimble I9 is attached to the creel board by suitable means such as screws 22, and the mounting member H is clamped between the 2,109,543 bears on the periphery of the yarn package, its

bearing thimble and the creel board so as to support the retarding member 8 in the desired posi-- tion.

Although but one form of the present invention has been shown and described in detail, it will be understood that other forms are possible and that changes may be made in the design and proportions of the parts and in their means of attachment and application without departing from the spirit of the invention as defined in the claims appended hereto.

What is claimed is:

1. In a spinning frame, a creel board, a bobbin for a yarn package, a vertical pivotal support therefor including a bearing member fixed to the creel board above the bobbin, a brake member in the form of a bar adapted to bear on the surface of the yarn package, and a hinge member for the brake clamped by said bearing to the creel board.

2. In a spinning frame, a creel board, a bobbin for a yarn package, a vertical pivotal support therefor including a bearing member fixed to the creel board above the bobbin, a brake member in the form of a bar adapted to bear on the surface of the yarn package, and a hinge member for the brake clamped by said bearing to the creel board, said hinge member having an elongated opening therein to receive the bearing whereby the pivot for the brake may be moved laterally to vary the relative braking effect with yarn packages of different sizes, and thus compensate for variations of friction in the pivotal support.

JOHN v. MANN. an

Images