US1015333A - Bobbin-carriage and bobbin of lace machinery. - Google Patents

Description

W. B. MITCHELL. BOBBIN CARRIAGE AND BOBBIN OF LACE MACHINERY.

APPLICATION, IIL-BD SEPT. 6, 1910.

e a f Patented Jan. 23, 1912. I 2 SHEETS"-S?T 1.

W. B. MITCHELL. BOBBIN CARRIAGE AND BOBBIN 0F LACE MACHINERY.

APPLICATION FILED SEPT. 6, 1910.

Patented Jan. 23, 1912.

2 SHEETS-SHEET 2.

FIG 8 FIG 7 WILLIAM sauce MITCHELL, or EneB sTomBrRMINeHAM, ENGLAND, AssIeNofi ro WILLIAM MITCH-ELL (PENS) 'LIMI'IED, or SMETI-IWICK, NEAR; BIRMINGHAM,

' ENGLAND.

BOBBIN-UARRIAGEWAND BOBBIN or iiAcn-MAoHINEmE.

To all whom it may concern:

Be it known that 1, WILLIAM BRUCE; MITCHELL, a citizen of Great Britain, residing at 44 Portland road, Edgbaston, B1rmingham, county of Warwick; England,

managing "director, have invented. a certain new and useful lmprovements in Bobbinthe working of the bobbin in the carriage,

remainsin principle the same.

Among the features which the various types ofoarriages have in common is an L opening which 1s substantially circular but provided at the inneredge of the lower.-half with a projecting portion or rib known as the verge. This opening in the carriage is termed the cage and the 'bObblIl; which is circular, 1s loosely retalned-inthis cage 1 by engaging onthe verge and by a retain ing spring'in the upper part engaging the bobbin by means of a shaped pro ection or nib and pressing it toward the verge.

The bobbins are commonly made with two disk like sides united by-rivetsftl1rough the center portion called the middle and re cessed from the peripheryof this middle to the perimeters of the disks to forman annular space to receive thethread. The'perimeters of the sides are cut awaysufficiently on the inner side to form lips which do not meet, and thus form an entrance or open way to the annular thread space,

so that the thread'may be woundinto the bobbin or removed therefrom. This space or way. "also forms the track portion by which the bobbin engages "the Verge 7 w of the carriage.

In all these known" constructions the lips of the bobbins have been faced square toward each other and parallel. 'To accomg modate these the verge of the carriage has necessarily been formed with parallel sides and the carriage has been recessed on each side to form the verge There Specification of Letters Patent Patented Jan. 23,1912. Application filed September 6, 1910,. "Serial No. 580,61. Y

cessing leaves-square shoulders at the base of the verge on each other side which receives the outer faces of the lips of thebobbln as the latter turns in the cage and its openway between the lips covers and v loosely fits the verge. These well known their normal position the bobbins are placed forms are open to serious objections which v the present inventionisxdesigned to obviate; 7 Some of these objections are As, the 1 bobblns. are wound;- and filled the sides are forced'apart and tobring the same back to; 5

under pressure, and in time the lips of the bobbin come in contact one with the other.

Such bobbins are then extremely ,diificu-lt or altogethervimpossible to wind, as. there is no way for the thread between the'" lips. If complete contact: of the lips has not taken place but they are partially closed,-then=,as the bobbin is being unwound in use, the lips press so tightly on the verge and on the nib of the springthatgthe friction becomes (BX-I cessive and either causes frequent -breakage of the'thread orproduces bad fabric.'; The r lips of the bobbin "become damaged from var ous causes; and the bobbins are then :un-

usable as the slightest damage impedes or completely checks the necessary running on the verge or the passage of the nib of the spring." 7 e I The holding capacity of the bobbiridepends of course upon: the size of the middle butin use',-as the thread is wound off the bobbin thespeed of the bobbin increases in proportion to-the amount of thread re- .p

moved; at the same time the pointwhere the F thread leaves the bobbin comes T" nearer the middle of the bobbin so that the decreased and an increased tension must angle of pull or the leverage of the. pull" is themiddle nust depend in practice on the 7 maximum tension that the thread can-"with- I stand, Hitherto there existed no means" of accommodating this tension. Bobbins of p the ordinary type (due to the fact thatjthe V a.

v lips are parallel) always present greatdiflicultiesin winding; as,thereis practically no lead or: guide tothethread; for these same reasons the-placing-ofthe bobbin in'posi} 'tion in the cage-ofthe carriage is extremely dilficuln andlikely to cause the bendin for or other damage to the. verge. ,Thevpresente type of verge is necessarily very delicate in formation and easily damaged, and as a verge cannot be replaced considerable waste is thereby caused.

In accordance with the present invention I form the open way of the bobbin and the verge of the carriage and also preferably the nib of the spring so that the engaging port-ions of each are coacting inclines or curves, so arranged that upon closing or partial closing of the lips of the'bobbin, these surfaces may still satisfactorily engage by automatically altering their relative position. I may employ various sections for the verge of the carriages and for the lips of the bobbin to present these antomatically adjusting inclines or curves, such as a conical section for the verge with the lips of the bobbin faced with corre sponding inclines to ride on the sides of the verge; or I may make the verge with convex sides in cross section or wit-h concave sides, correspondingly curving the surfaces of the lips so that they will coact with the verge. It is preferred that the nib of the spring should correspond in form to the verge. I may in some instances remove the verge altogether and groove the carriage shaping the groove wedge like in cross section or with convex or concave sides; in these cases the lips of the bobbins are faced on their outer sides with inclines, convex or concave surfaces so as to work in the before mentioned relation with the surfaces of'the groove in the carriage. In some cases by using bobbins with their open ways formed in accordance with my invention I may, by beveling the verge fit up old types of carriages with my invention.

On the drawings: Figure 1 is an elevation showing one type of carriage with a bobbin in place therein and with my invention applied. Fig. 2, is a section of the same on' line 22. Fig. 3, is an enlarged section showing one example of the construction of the verge and the bobbin which is to ride upon it. Fig. 4, is a section of this construction but showing a different working relation between the two parts. Fig. 5, shows a modified construct-ion in which coacting curves are used. Figs. 6 and 7 show further modifications but in these one of the advantages aimed at by my invention is not obtained. Fig. 8 shows my invention as it may be applied to old carriages by beveling the sidesof the parallel verge and providing bobbins made in accordance with the invention.

.On these drawings in the general views Figs. 1 and 2, a is a carriage of one particular type which is wellknown and serves here simply as an example. The bobbin is represented by b and the opening or cage in the carriage by the letter 0. The bobbin viously set forth it is with the bobbin in its relation to the verge and the nib of the retaining spring that my invention is concerned and I accordingly show these parts on a larger scale at Fig. 3. The verge f is formed as a cone in vertical section, its sides presenting inclines h. h. The lips e of the bobbin are shaped so that the open way or track of the bobbin presents inclines 2'. i. which correspond to those h, h, of the verge. The nib of the retaining spring which projects into the way or track of the bobbin so as to retain the latter properly on the verge is similarly shaped in cross section as will be seen from Figs. 2 and 3 so that the bobbin and the nib may smoothly cooperate even if the bobbin way or track is partially closed.

As shown at Figs. 2 and 3 the verge is so formed that the bobbin takes its bearing on the inclined sides thereof; but as shown at Fig. 4 the verge is shorter and the peripheries of the lips of the bobbin may then rest upon the shoulders k at each side.

At Fig. 5 the verge and the bobbin track are formed of corresponding curves for the engaging surfaces in place of inclines. The nib of the retaining spring will correspond in cross section.

At Fig. 6 the verge as a projection is dispensed with and a recess is formed in its place in the carriage. The sides of this recess provide the inclines and the bobbin is provided with surfaces on its sides to correspond therewith. The accommodating relationship between the bobbin and its carriage is thus obtained.

Fig. 7 shows an arrangement similar to Fig. 6 but with coacting curves instead of inclines.

With both the forms seen at Figs. 6 and 7 only part of the advantages which are obtainable by my invention are secured.

As represented at Fig. 8 it is possible to adapt a carriage having an ordinary verge for use with my invent-ion by beveling the top of the verge at each side. This will then accommodate a bobbin of my improved type but will not be so satisfactory in arrangement as a carriage constructed fully in accordance with this invention.

From the construction shown at Figs. 1, 2, and 3, which is preferred and the examples of modifications given in the latter figures the invention will be clearly comprehended. Now with the improved construction, suppose the bobbin lips to be closed or partially closed, the bobbin may still work in the cage without undue friction, as owing to the formation of the engaging, Surfaces as "co-actmg lnchnes, or curves, the bobbln automatically adyusts ltself to the vergeby rlsing slightly and the working relation is not dis turbed. This is also the case with the nib-of the spring as the way of the bobbin and the nib may change their relative position riage, as the damaged part comes into con-' tact therewlth and no undue frict on is caused. As the bobbin is unyvound the thread circle reduces in diameter and the speed of the bobbin and tension on the thread. increases; with my construction the bobbin accommodates the increased tension by eas ing itself on the verge and reducing friction, thus the tension is reduced to a normal strain, and breakage ofthe threadprevented; also this enables smaller middles to be used and consequently increases the holding capacity of the bobbin. Owing to thisimproved construction the verge is stronger as it is thicker atthe base; it may in fact gradus ally taper into the actual thickness of the carriage; thus the present danger of damage to the verge e ther wh1le-1n actual use,

or when the bobbin is separated from its carriage, or when they are being assembled again, is eliminated. Further the-improved construction gives greater durability to the engaging parts of abobbin carriage and its bobbin. In the cases where the bobbin lips are shaped With conical or curved. ways j the outer portion is always wider than the inner part and consequently if by'pressure' the lips are closed, it is the inner parts which meet and the outer are left open, thus always leaving a guide or way for the thread It is thus always possible to Wind the bobbin and moreover owing to this guiding provision for the thread, winding is much more easily and quickly performed. Further, 'owingto this construction, bobbins are more easily mounted in the carriage so that, apart from the verge belng stronger to reslst damage,

the latter is less likely to accrue to itowing to this greater ease of insertion. I may with my improved construction of the verge, radius or incline each end so that from the 1s provided and all shoulders are avoided.

With this invention carried out as set forth at Figs. 1, 2, and .3, I find the cars is no need to recess out the carriage to sharp square angles at the sldes of the verge as 1s that the tools used in the manufacture {last many times as long as hitherto. I What I claim and desire to secure by Letters Patentthen is: 1. In bobbin carriages and bobbins, a c'arruns, a verge? within said cage, a bobbin having a thread slot between peripheral means of said lips, and a retaining spring tion on said verge, the engaging portions of said bobbin and said verge being ,co- 'aoting inclines which upon partial closing ,of the lips of saidbobbin automatically alter their relative position so that a satisfactory engagement still takes place. i

2. Inibobbin carriages and bobbins a care 'riage having a cage inwhich the bobbin runs, a verge within said cage,abobbin having a thread slot between peripheral lips, said bobbin engaging said verge by means of said lips, and a retaining spring holding said bobbin in proper working position on ;said verge by means of anib, the engaging portions of said bobbin and said verge and said nib of the retaining spring being co- 3. In .bobbin carriages and bobbins car riage having a cage in which'thebobbin runs, a recess in said carriage for a portion ofthe extent of said cage, bobbin having a-thread slot and inturnedlips, said bobbin thereof, .the engaging surfaces of said car holding said bobbin in place, substantially as described.

signature in presence of two witnesses.

7 WILLIAM BRUCE MITCHELL.

Witnesses: V i i F1 GIL ERT BRE'ITELL,

SIMs BRETTELL.

Copies '01. this patent may be obtained for five cents each, by addressing the Gommissionerof Patents Washi ngton, IL'G. is

riage is less costly in manufacture as there acting inclines as set forth.

riage. and said, bobbin being formed as co-. ,actmg lnclines, and retalnlng means for In testimony whereof I have affixed my 1 open part of the cage 0 alead onto the'verge done'with theold parallel construction so I riage" having a cage in which the bobbin lips, said bobbin engaging said verge by holding said bobbin in proper working-posi v working in the recess in said carriage, the outer sldes of its llps engaging the walls,

Images