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Publication numberUS1731715 A
Publication typeGrant
Publication dateOct 15, 1929
Filing dateNov 25, 1927
Publication numberUS 1731715 A, US 1731715A, US-A-1731715, US1731715 A, US1731715A
InventorsC. K. Dunlap
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1731715 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Oct. 15, 1929. c, DUNLAP 1,731,715

APPARATUS FOR MAKING BOBBINS Original Filed Nov. 25. 1927 Patented d ct. l5, i929 "lilll'hild YATES PATENT OFFICE CHAR-l4.


November 23, 1928.

The present invention relates to machines for the manufacture of bobbins of the type adapted for use in the textile industry as cores or supports for thread windings. I

lilore particularly stated the present invention relates to machinery for making paper bobbins of the bottle type. The bobbin known as the bottle bobbin comprises essentially a cylindrical portion and a conical portion, these portions being coaxial and se cured together so that their surfaces meet in a circular line. Bobbins of this character have heretofore been generally made of wood although other materials, including paper have been utilized. The present invention contemplates certain improvements in machines for the production of paper bobbins whereby such bobbins can be made very quickly and cheaply but nevertheless veryaccurately so that the thread bearing surfaces of the cylindrical and conical portions there of are truly co-axial and truly concentric with the axis of the bobbin. The machine which I have devised for making these bobbins may be constructed. in various ways to comply with local requirements, and the invention is not limited to the exact form of the appara tus which is illustrated in the accompanying drawings by way of example, and hereinafter described in detail. This application a division of my co-pending application Serial lilo. 235,691, filed Nov. 25, 1927.

in the drawings:

lligure 1 is a side elevation of an apparatus suitable for reaming out the interior of the conical portion of a bobbin;

Figures 2 and 3 are sectional detail views on a larger scale, showing co-acting members of the apparatus in different positions;

Figure 1 is a longitudinal sectional view through the conical portion of a bobbin, after its completion, but before its assembly with the cylindrical portion; and

Figure 5 is a side elevation of a finished bobbin, partly broken away to show the joint between the two portions thereof.

rel-ring first to Figures 1 to 3. In Figure l is illustrated somewhat diagrammatically a machine suitable for reaming out the lower end of a paper or fabric cone to form therein Divided and this application filed Serial No. 321,467.

a cylindrical surface which is adapted to threaded on the lower end of a hollow cylinder or pipe let and has a sharp serrated cutting edge, as indicated. The pipe 14 is rotatable in vertically spaced and aligned bearings 15 and 16 which are rigid with the upper portion of standard 10, and has fixed thereon between these bearings a pulley 17. Rotation is imparted to the cutter by a belt 18 which passes around pulley l7 and over an idler guide pulley 19 and around a drive pulley 20 which is driven by a suitable motor (not shown).

The chuck 12 is frustro-conical in form and may have its lower smaller end integral with the cylinder 21. This cylinder 21 is mounted for vertical reciprocation in a bearing 22 rigid with frame 10, and is formed with a collar 23 adapted to engage bearing 22 to limit the downward movement of the chuck. Bearing 22 is aligned with bearings 15 and 16 so that the axis of chuck 12 is mounted in exact coincidence with the axis of reamer 11. The chuck is adapted to be raised by a foot lever 24 which is fulcrumed at 25 on the base of upright 10. This lever is connected by link 26 to one arm of a lever 27, the other arm of which is bifurcated and slotted to receive pins projecting laterally from the lower end of pipe 21. The'chuck is urged to the lower position shown in Figure 1 by gravity or by a suitable spring or both.

A. cone previously wound by known methods and preferably one which has had its exterior surface ground and finished in accordance with the method described in my Patent 1,634,492 dated July 5, 1927, is placed in chuck 12 as shown in Figure 1. The interior conical surface of the chuck is of such dimensions that when the. cone is seated therein the lower end of the cone will project very slightly within the pipe 21, as indicated in Figure 2. With the cone thus positioned and the cutter 13 rapidly rotating the operator depresses the foot lever 24: and thereby raises the chuck with the cone therein to the position shown in Figure 3. In moving to this position the cutter reams out the lower end of the cone, forming a true cylindrical surface in said lower end, which was precisely coaxial with the axis of the exterior surface of the cone, and which meets the exterior conical surface at a very sharp angle, forming a feather edge, as indicated in Figure 4. It is to be observed that the diameter of cutter 13 is substantially equal to the internal diameter of pipe 21, as indicated in Figure 3, and therefore produces a very sharp feather edge at the small end of the cone. The nose or apex of the cone, severed by the reaming operation, is preferably blown out through the lower end of pipe 21 by an air blast delivered from a tube 30 which extends down through pipe l t to a point adjacent the cutter, or may be removed by a suitable mechanical means. When the reaming operation is finished the operator releases lever 24 thereby permitting the chuck to drop away from the reamer so the cone may be removed from the chuck and another inserted.

The cone prepared by the method and with the apparatus above described is adapted for assembly with the cylindrical part or channels to term the finished bottle bobbin. It is necessary that the cylinder be precisely coaxial with respect to the axis or the cone in the finished bobbin, since in use the bobbins are rotated at a high rate and any eccentricity thereof would render the bobbin useless. For that reason great care is exercised in the step of gluing the conical portion of the bobbin to the cylindrical portion to obtain the completed article shown in Figure The contacting surfaces of the cylindrical and conical portions oi the bobbin are secured together by a suitable paste or glue and, when dry, the bobbin is ready for use. It will be noted that there is no abrupt shoulder along the line of junction oi the outer conical surface of the conical portion of the bobbin and the outer cylindrical surface of the cylindrical portion ot the bobbin but that, on the other hand, these two surfaces meet along a circular line. This is important. The elimination of this shoulder, which. has been common to other types 0-1: paper bobbins heretofore made, is very desirable inasmuch as it prevents piling up of the threads at this junction point with resulting tangling or uneven unwinding thereof. By means of the apparatus disclosed it is possible to get this line junction with total elimination of a shoulder at the bottom, whereas by means of no prior apparatus of which I am aware would this result he realized. Thus by means of the present apparatus the cone which is intended to comprise the base of the bottle bobbin is cut away in such manner as to have a true feather edge at its forward end instead of a terminal edge having a considerable thickness. This feather edge eli ect may be realized by firmly supporting the cone during the cutting operation so that no portion 01 it is thrust outwardly by the cutter 13 during this operation.

Assembly of the cylindrical and conical portions oi the bottle bobbin is preferably efi'ected by the means and in accordance with the method disclosed in my copending application above referred to, but may be effected in any other manner thought suitable or desirable. In any event however it is probably best to insert the tubular portion oi the bobbin through the base of the conical portion rather than to insert it in the opposite direction inasmuch as the lit is a very close one and it is not desired to injure the feather edge in any manner. By means of my improved machine the conical portion of a bottle bobbin can be prepared quickly, easily, accurately and cheaply and the resulting bobbin is of superior quality, the exterior surface of the conical member merging smoothly with the cylindrical surface of the cylindrical member with no shoulder at the joint.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. Apparatus for preparing a l' rusto-conical member for attachment to a tubular member, comprising in combination, a holder for the frusto-conical member having an upper frusto-conical portion in which said member is adapted to seat and a lower cylindrical por tion into which the lower end of said member is adapted to slightly project, and a rotary cylindrical cutter co-axial with said holder and having a diameter substantially equal to the diameter of the cylindrical part of said holder, and means for reciprocating one of said parts towards and from the other.

2. Apparatus for preparing a frusto-conical member for attachment to a tubular member comprising in combination a frame, a holder for the frusto-conical member having an upper i rusto-conical portion in which said member is adapted to seat and a lower cylindrical portion into which the small end of said member is adapted to slightly project, said member being mounted on said frame for vertical reciprocation, a lever connected to said member for reciprocating the same, and

a cylindrical cutter rotatable in said frame above said holder coaxial with the holder and having adiameter substantially equal to the diameter of the cylindrical part of said holder.

3. Apparatus for preparing the trustoconical member of a bottle bobbin, tor assembly with the cylindrical portion thereof, comprising, in combination, a holder for a conical member having a trustoronical' cone seating surface which terminates in a circular line lying in a plane normal to the axis of said conical surface and through which plane the point or nose of acone projects when seated in said holder, and a cutting member provided with a cutting edge adapted to make a cylindrical cut through the wall of such cone, which cut shall be coaxial with the cone and have adiameter substantially equal to the diameter of the circular terminating line of the holder, said holder and cutting member being relatively movable in such manner that the cutting member may be caused to enter the interior of the cone from the base, and sever the nose therefrom, along a cylindrical surface as aforesaid.

In testimony whereof I hereunto afiix my signature.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2455538 *Jan 8, 1945Dec 7, 1948J F Helmold & Bro IncMethod of making cutting tools
US2771114 *Dec 15, 1953Nov 20, 1956Labernie Martin NegreteTire tread construction
US5709010 *Mar 31, 1995Jan 20, 1998Chesebrough-Pond's Usa Co., Division Of Conopco, Inc.Cotton swabs with expanded tips
US5766143 *May 27, 1997Jun 16, 1998Chesebrough-Ponds' Usa Co., Division Of Conopco, Inc.Cotton swabs with expanded tips
U.S. Classification408/64, 493/370, 76/115, 493/343
International ClassificationB31C9/00
Cooperative ClassificationB31C9/00
European ClassificationB31C9/00