US2988029A

US2988029A - Bobbin winder for sewing machines

Info

Publication number: US2988029A
Application number: US712108A
Authority: US
Inventors: Edward J Herbst
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1958-01-30
Filing date: 1958-01-30
Publication date: 1961-06-13
Anticipated expiration: 1978-06-13

Description

June 13, 1961 E. J. HERBST BOBBIN WINDER FOR SEWING MACHINES 2 Sheets-Sheet 1 Filed Jan. 50, 1958 n A H re INVENTOR. Edward J. Herbs! ATTORNEY F I I l I l I June 13, 1961 E. J. HERBST 2,988,029

BOBBIN WINDER FOR SEWING MACHINES Filed Jan. 30, 1958' 2 Shets-Sheet. 2

A 42 Fig. 3

INVENTOR.

Edward J. Herbs! United. States Pater v 2,988,029 BOBBIN WINDER FOR SEWING MACHINES Edward J. Herbst, South Plainfield, N.J., assignor to The Singer Manufacturing Company, Elizabeth, N.J., a corporation of New Jersey Filed Jan. 30, 1958, Ser. No. 712,108 6 Claims. (Cl. 1'12220) This invention relates to sewing machines and more particularly to a bobbin winding device adapted for use with sewing machines, and one of the primary objects of the invention is to provide an improved device of this character.

Another object of the invention is to provide an improved means for guiding and tensioning the thread as it passes to the bobbin on which it is being wound.

A further object of the invention is to provide an improved means by which thread may be wound on a bobbin carried on the end of a motor shaft.

A still further object of the invention is to provide an improved combination thread-guiding and threadtensioning device.

7 With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled inthe art.

In the drawings:

FIG. 1 is a side elevational view, partly in section, of a portion of a sewing machine embodying the present invention;

FIG. 2 is a right-hand end view of the sewing machine shown in FIG. 1;

FIG. 3 is an enlarged sectional View of a portion of the mechanism shown in FIGS. 1 and 2 and taken on the line 33 of FIG. 2;

FIG. 4 is an exploded perspective view of parts of the mechanism; and I a FIG. 5 is an exploded perspective view of other parts of the mechanism. Referring to the preferred embodiment of the invention, illustrated in the drawings, the sewing machine is shown as comprising a bed-plate 16 providing a work support from one end of which rises a hollow standard 17 of an overhanging bracket-arm 18. The bracket-arm 18 by meansof a plurality of bearings, one bearing being shown at 19, rotatably carries amain shaft 21. A flanged sleeve 22 is secured to the shaft 21 by a screw 23 and the sleeve 22 rotatably journals a hand wheel 24. The hand wheel 24 is driven by a belt 26 which, in turn, is driven by a pulley 27secured to a horizontal shaft 28 of a built-in driving motor 29 housed in the standard 17 in a known manner. The shaft 28 extends through an aperture 31 formed in a side wall of the standard 17 and thus projects outside of the standard 17.

The shaft 21 and the hand wheel 24 may selectively be connected or disconnected by means of a known clamp stop-motion washer 32 and a clamp stop-motion clutch nut or member 33 having internal threads 34 which engage external threads 36 formed on the end of the shaft 21. When the nut 33 is tightened, the washer 32, which is keyed to the sleeve 22, is firmly pressed against the end of the hub 37 of the wheel 24. This causes the shaft 21, the sleeve 22, the washer 32, and the wheel 24 to rotate as a unit when the wheel 24 is driven by the belt 26. Loosening the nut 33 permits the motor shaft 28, the pulley 27, the belt 26, and the handwheel 24 to be driven without driving the shaft 21.

The end of the motor shaft 28, which extends through the aperture 31, carries a bobbin holding member 38 having a bifurcated end 39 adapted frictionally to receive a bobbin 40 for rewinding. The bobbin holding member 38 is secured to the end of the shaft 28 by a set screw 41 and axially positions the bobbin 40 to permit winding along the entire length of the bobbin 40.

In order to provide a better angle of lead for the bobbin thread 42 as it is wound on the bobbin 40, and in order to tension the thread 42 properly, a combination thread-guiding and thread-tensioning device 44 is mounted on the clamp stop-motion clutch nut 33. The combination thread-guiding and thread-tensioning device 44 comprises a screw 46 passing through an axial hole 47 formed in the nut 33, an inner tensioning disk 48, and an outer tensioning disk 49, the inner disk 48 having a counterbore 51, the purpose of which will presently appear. The combination thread-guiding and thread-tensioning device 44 also has a helical compression spring 53 and a knob or body member 54, and when the device 44 is assembled the concave side of the inner disk 48 engages the external surface 56 of the nut 33 and the convex thread engaging side of the disk 48 is engaged by the convex thread engaging side of the outer disk 49. The concave side of the disk 49 is engaged by one end of the spring 53 and the other end of the spring 53 enters the central aperture 61 of the disk 49 is large. This arrangement permits the washer 48 to be carried by the screw 46 and the washer 49 to be carried by the external surface of the pilot 58 of the knob 54. These figures also show that the free end of the pilot 58 enters the counter bore 51 formed in the disk 48. In this connection it should be noted that the aperture 59 and the counterbore 51 are coaxial.

The operation of winding the bobbin 40 includes loosening the clamp nut 33, thus declutching the hand wheel 24 from the shaft 21. This'allows the bobbin 40 to be wound without having the motor 29 drive the complete sewing machine mechanism. The operation of winding the bobbin 40 also includes drawing the thread 42 from a supply spool (not shown), through a thread eyelet 68 secured to the bed plate 16 at a location in the plane defined by the abutting faces of the disks 4849, thence between the convex faces of the

disks

48 and 49 and over the outer surfaces of the pilot 58. Then the thread 42 passes to the bobbin 40 on which it is wound as the motor 29' turns the shaft 28. Preferably the bobbin thread 42'is passed or moved between the disks 48-49 and over the pilot 58 of the combination thread-guiding and thread-tensioning device 44 in such a direction that the movement of the thread 42 assists in maintaining the clamp nut 33 in its loosened position. In the machine shown, the nut 33 preferably is loosened by turning it in a clockwise direction as seen in FIG. 2. In other words, as the thread 42 passes from the eyelet 68 between the disks 4849 and over the pilot 58, there is a tendency for the thread 42 (FIG. 2) to turn the nut 33 in a clockwise direction, thereby loosening the same. This assists in maintaining the clamp-nut in its maximum loosened position and consequently the remainder of the sewing machine mechanism at its desirable standstill position during the bobbin winding operation.

It will be understood that the stop motion washer 32, in accordance with well-known practice and as shown in United States Patent No. 1,934,373, carries three equidistantly spaced stop-pins 98, of which only one is shown in the present drawings. A selected one of these pins Patented June 13, 1961 isengaged by the removable stop-screw 99 carried by the clamp member 33, and it will be understood that thisarrangement, in a well-known manner, prevents undue loosening of the clamp member 33.

Having thus described the nature of the invention, what I claim herein is: t

1. In a sewing machine, a main shaft, a clamping member carried by said main shaft, a motor shaft disposed at a level different from said main shaft and adapted to hold a bobbin, a fastening means carried by said clampmg member, a first tension disk carried by said fastening means, a body member, a threaded pilot formed as part of said body member, said pilot being secured to said fastening means, a second tension disk carried by said pilot and engaging said first tension disk, spring means pressing said second tension disk against said first tension disk, and a bobbin holding member carried by the end of said motor shaft, said pilot and tensioning disks guiding and tensioning a thread as it is wound.

2. 'In a sewing machine, a main shaft, a clamping member carried by said main shaft, a motor shaft disposed at a level different from said main shaft and adapted to hold a bobbin, a screw carried by said clamping member, a first tension disk carried by said screw, a body member,

a threaded pilot formed as part of said body member,

said pilot being threaded on said screw, a second tension disk carried by said pilot and engaging said first tension disk, spring means pressing said second tension disk against said first tension disk, and a bobbin holding member carried by the end of said motor shaft, said pilot and tensioning disks guiding and tensioning a thread as it passes to a bobbin on said motor shaft.

3. In a sewing machine, a main shaft, a clamping member carried by said main shaft, a motor shaft spaced from said main shaft and adapted to hold a bobbin, a screw carried by said clamping member, a first'tension disk carried by said screw, a body member, a threaded pilot formed as part of said body member, said pilot being threaded on said screw, a second tension disk carried by said pilot and engaging said first'tension disk, a compression spring interposed between said-second tension disk and said body member and thereby adjustably pressing said second tension disk against said first tension disk, and a bobbin holding member carried by the end of said motor shaft, said pilot and tensioning disks guiding and tensioning a thread as it passes to' a bobbin on said motor shaft.

4. In a sewing machine, a main shaft, a clamping mem ber carried by said main shaft, a motor shaft spaced from said main shaft and adapted to hold a bobbin, a screw carried by said clamping member, a first tension disk carried by said screw, said first tensiondisk having a thread-engaging side provided with a counterbore, a body member, a threaded pilot formed as part of said body member, said pilot being threaded on said screw and having its free end entering said counterbore, a second v 4 .v tension disk carried by said pilot and engaging said'fir'st tension disk, a compression spring interposed between said second tension disk and said body member and thereby adjustably pressing said second tension disk against said first tension disk, a bobbin holding member carried by the end of said motor shaft, and, an eyelet carried by the bed plate of said sewing machine, said eyelet guiding a thread to a position between said tension disks and over said pilot, said pilot and tensioning disks guiding and tensioning a thread as it passes to a bobbin on said motor shaft.

5. In a sewing machine having a frame, a shaft journaled in said frame and'arranged to rotate in a predetermined direction while driving said sewing machine, a pulley carried on said shaft, means for releasably connecting said pulley to said shaft including a clamp stop-motion clutch member threaded on said shaft, the threadson said clamp stop-motion clutch member being such that turning of said clamp stop-motion clutch member in a predetermined direction will loosen saidclamp stop-motion clutch member, a bobbin winder mounted on said frame and spaced from said shaft, and a thread-guiding and tensioning device mounted on said clamp stop-motion clutch member for assisting in guiding and tensioning a thread being wound on a bobbin mounted on said bobbin winder, the direction of movement of said thread as it is guided and tensioned by said thread-guiding and tensioning device being such as to turn said clamp stop-motion clutch member in the predetermined direction to loosen said clamp stop-motion clutch member.

6. In combination, a main-shaft of a sewing machine, a clamp stop-motion clutch member screwedto said mainshaft in such a manner that turning said clutch member in a predetermined direction loosens said clutch member, a thread-guiding and tensioning device carried by said clutch member, means carriedby said thread-guiding and tension-ing device, said means being so constructed and arranged that when the thread passes through said last named means said thread-guiding and tensioning device and said clamp stop-motion clutch member will turn in the predetermined direction to loosensaid clutch member, and means to prevent complete disengagement of said clamp stop-motion clutch member from said mainshaft.

References Cited in the file of this patent UNITED STATES PATENTS Lange et al. Dec. 9, 1958 m-jil' fi ht;