US2242962A

US2242962A - Sewing machine

Info

Publication number: US2242962A
Application number: US294615A
Authority: US
Inventors: Max L Waterman
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1939-09-13
Filing date: 1939-09-13
Publication date: 1941-05-20
Anticipated expiration: 1958-05-20

Description

May 2@, W43" M. L. WATERMAN SEWING MACHINE Filed Sept. 13, 1939 6 Sheets-Sheet l gwmawmo flax Z. waz ermm May 2@, W41, 7 M. L WATERMAN SEWING MACHINE Filed Sept. 13, 1939 6 Sheets-Sheet 2 May 2%), 1941. M. L. WATERMAN SEWING MACHINE Filed Sept. 13, 1939 6 Sheets-Sheet 3 t m w W my w W lg m w m w W W41, M. n... \NATERMAN 2,242,962

SEWING MACHINE Filed Sept. 13, 1939 6 Sheets-Sheet 4 May 2%, 1194-1. M L T M N 2,242,962

SEWING MACHINE Filed Sept. 15, 1959 6 sheets-Sheet 5 a l 5 o fi 33,43 WW z mmsz May 20, 11941. M. L. WATERMAN SEWING MACHINE 6 Sheets-Sheet 6 Filed Sept. 15, 1939 JWM wafiermwn Patented May 20, 1941 SEWING MACHINE Max L. Waterman, Fairfield, Conn., assignor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application September 13, 1939, Serial No. 294,615

6 Claims.

This invention relates to sewing machines more particularly of the small portable electrically driven type for family use.

The invention has for an object to provide machine of this nature which is simple and inexpensive in construction, small in size and compact in the arrangement of its component parts, and which is quiet running and eflicient in its operation.

Considerations such as weight, cost and housability dictate the choice of a high-speed motor of small size for an electric sewing machine of the type in question and, as a result, the disposition of the motor and the construction of the machine to receive it, as well as the driving connections for transmitting the power of the highspeed motor to the moderate speed machine are problems which must be met and solved in a successful portable electric family type sewing machine.

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 in the art.

In the accompanying drawings, Fig. l is a longitudinal vertical section through a sewing machine embodying the invention. Figs. 2 and 3 are perspective views of the rotary hook element of the machine. Fig. 4 is a top plan view of the machine with the overhanging bracketarm in longitudinal section. Fig. 5 is a right end elevation of the machine with the bracket-arm .standard in vertical section. Fig. 6 is a transverse vertical'sectional view through the machine-bed showing the reversible feed-mechanism. Fig. 7 is a detail view of a part of the take-up mechanism. Fig. 8 is a front end elevation of the machine with the bed in transverse vertical section. Fig. 9 is a top plan view of the rotary hook.

Fig. 10 is a top plan view of the stationary bobbin-case normally nested in the rotary hook of Fig. 9. Figs. 11 and 12 are perspective views of the thread-case of Fig. 10. Fig. 13 is a vertical sectional view through the hook axis in a plane at right angles-to the plane of the bed-section of Fig. 8. Fig. 14 is, a detail view of the bobbin-case rotation restraining device on the sewing machine throat-plate. Fig. 15 is a horizontal section through the machine-bed, below the top or work-supporting surface thereof, showing the bottom closure for the bed and the motor mounting means carried by said bottom closure. Fig. 16 is a horizontal section through the machine-bed, looking upwardly, taken in the plane of the top surface of the bottom bed-closure plate or board, to show the under bed mechanism in bottom plan, and Fig. 17 is a plan view of the throat-plate of the machine.

The machine frame comprises a hollow boxtype bed I with downturned side and

end walls

2 and 3 and a top work-supporting wall into which is let the throat-plate 4. The bottom of the bed is closed by the bottom plate or board 5 which is secured to the bed I by screws 6 and rests on the rubber feet I.

Secured to and rising from the bed I is the standard 8 of the overhanging bracket-arm 9 terminating in the head l0 which latter carries the usual reciprocatory needle-bar I l and springpressed presser-bar l2 for the needle [3 and presser-foot M, respectively.

The main-shaft l5, which makes one revolution per stitch, is journaled in the bed I and has an outboard projection IS" n which is mounted the combined belt-pulley and balance wheel I6. It will be observed that the end wall 3 of the bed adjacent the bracket-arm standard 8 is inset to provide an externally open frame pocket with overhanging top and side aprons or guard-flanges ll, 18, Fig. 16, for the belt [9, the main-shaft pulley l6 and the motor-pulley 20.

The motor-pulley 20 is preferably not mounted directly on the motor-shaft 2| but is fixed with the gear 22 to a sleeve 23 journaled on the stud-pin 24 carried by the motor-frame 25. The motor-shaft 2| has fixed to it a pinion 26 meshing with the gear 22 and driving the latter and the pulley 20 at a reduced speed, say one-third the speed of the motor-shaft. The motor-pulley 20 may, in turn, be about one-half the pitchdiameter of the pulley l6, whereby a further reduction in speed is effected so that the mainshaft I5 of the machine is driven at about onesixth motor speed. Any ratio may, of course, be selected within reasonable limits without departure from the invention. Adequate power may thus be had in a small high-speed motor which may be easily housed within the bed cavity of a portable family machine of the type hereinabove indicated. Also the need for a large main-shaft pulley I6 is avoided. The pulley I6 is adequately guarded by the bed extensions 11,

' 3, without encroaching on the space above the level of the work-supporting plane of the machine.

The motor 25 is preferably carried by a platelike lever 21 which is fulcrumedat 28 on the baseboard 5 and has between its ends an upturned lip 29 which is engaged by the springpressed plunger of the belt-tightener fitting 3| mounted on the baseboard 5. There is fulcrumed at 82 on an upturned lip 88 of the plate 21 a finger-lever 84 which extends through a slot 85 in the recessed or inset portion 2 of the front side wall 2 of the bed I for access. This lever 84 has a laterally bent tongue 88 which is adapted to engage the rear side of the front wall 2 of the bed I and swing the motor-carrying lever 21 toward the main-shaft [5, or to dotted line position, Fig. 15, to loosen the belt 18 when the finger piece 84 is depressed from the position shown in Fig. 5. When in this position the motor and pulley 28 will run idly and may be used to wind bobbins received on the pulley hubextension or spindle 28'.

The upper run of the belt is supported by the pin 31 so that, when the belt is slackened, it will not sag of its own weight and grip the motor pulley.

The needle-bar II is connected by the link 38 to the crank-arm 88 on the rock-shaft 48 in the bracket-arm 8. ;The rock-shaft 48 has fixed to it another crank-arm 4| which is actuated by the pitman 42 from the eccentric 43 on the mainshaft l5.

The needle-thread take-up arm 44 is fixed to the rock-shaft 45 in the bracket-arm 8 which rock-shaft has fixed to it a pin 45 slidably engaged by the cross-pin 41 pivoted in the upper forked end of the lever 48. The lever 48 embraces an eccentric 48 at its lower end and is formed between its ends with a slot 58 to slidably embrace the fulcrum block on the pin 52 extending transversely of the standard 8. The described mechanism moves the cross-pin 41 in an elliptical path, shown in dotted lines in Fig. 5, and gives to the take-up a fast up-stroke or thread take-up motionand a slow down-stroke or slack giving motion as is commonly required of take-ups for rotary hook sewing machines such as the present machine. The present form of take-up is not herein claimed as it forms the subject of my copending application, Serial No. 291,839, filed August 25, 1939. p

The rotary hook comprise; a cup-shaped body 53 having a loop-taking beak 54 and a circular open topped raceway 55 in which rests the peripheral bearing rib 56 of the bobbin-case 51. The hook-body 53 is carried by the vertical hookshaft 58 journaled in the bed .I and having fixed to it a spiral gear 58 meshing 2 to 1 with the driving gear 60 on the main-shaft l5. Thus the hook is driven two revolutions for one revolution of the main-shaft.

The bobbin-case 51 is formed at one side with the rotation-restraining tongue Bl which enters a rotation-restraining notch between the two lugs 62 on the under side of the throat-plate 4.

The machine is preferably provided with a mechanical opener for forcibly oscillating the bobbin-case in a direction opposite to the direction of rotation of the hook-body 53, at the period of the cycle when the needle loop is being contracted by the take-up after having been cast about the bobbin-case by the rotary hook; the purpose being to open an escape gap for the contracting needle-loop between the rotation-restraining tongue iii and one of the throat-plate ajaaaoea lugs 82. The mechanical opener may take the form of an eccentric operated vibratory lever 68 fulcrumed at 64 in the bed I and carrying the vertically adjustable tappet 65 adapted to periodically engage the shoulder 85 on the bobbin-case to open the needle-loop escape gap between the tongue Bi and shoulder 62 last passed by the rotary hook beak.

It will be observed that the bobbin-case 51 rests by gravity in the hook raceway and that the cover slide plate 81, Figs. 1 and 8, is disposed directly above the bobbin-case 51 and holds the latter against accidental displacement from its properly nested relation with the hook body. There is enough clearance between the bobbin-case and I cover slide to permit free passage of the needlethread loops about the bobbin-case; the cover slide 61 being cut away at its under side at 88, if necessary.

The feeding mechanism comprises the usual feed-dog .89 which is carried by the feed-bar Ill formed with a depending horizontally slotted portion 1| embracing the feed-lift cam 12 on the main-shaft 15. The feed-bar is pivotally connected at its rearward end to the supporting rocker-arm 13 which swings on the axis of the shaft 14 for the support of the feed-bar.

There is fulcrumed at 15 on the bed a rocking frame 15 which has a slotted portion 11 embracing the feed-eccentric 18 on the main-shaft. The frame 18 carries a cylindrical pin 19 slidably engaged by a cross-pin in the forked endof a link 8i which is connected at its other end to an arm 13' rigid with the feed-rocker 13. The axes of the fulcrum l5 and cylindrical pin I8 intersect and when the cross-pin 19 is shifted into axial coincidence with the fulcrum 75 the rocking motion of the frame 76 will impart. no motion to the feed-rocker 13. When the link 8| occupies full line position, Fig. 6, or any position above the axis of the fulcrum 75 there will be a forward feed of the work, whereas, when the link 8| occupies dotted line position, Fig, 6, or any position below the axis of the fulcrum 15 there will be a reverse feed of the work, as will be readily understood by those skilled in the art. The link 8| is connected by a link 82 tov a feedregulating lever 83 which is fulcrumed at 84 within the bed I and has an accessible portion 85 projecting forwardly through a vertical slot 86 in the recessed portion 2 of the front wall 2 of the bed. A friction washer 81, Fig. 16, at the fulcrum of the feed-regulating lever 83,

holds such lever stationary in any selected posi- I placeable, without disassembly of any of the machine parts, yet is adequately guarded and protected by the bed wall extensions I1, l8.

Having thus set forth the nature-of the invention what I claim herein is:

1. A sewing machine having a frame formed with a box-type bed and an overhanging bracketarm, said bed having one of its external walls inset to provide a wide open pocket, a main-shaft and an electric motor disposed in vsaid bed,-

spaced motor and machine-pulleys in said pocket,

and a belt connection in said pocket between said pulleys.

2. A sewing machine having a frame including a box-type bed and overhanging bracket-arm, said bed having its external end wall adjacent the bracket-arm standard inset to provide a wide open end-pocket, a main-shaft journaled in said bed and having an outboard projection in said pocket, a main-shaft pulley in said pocket, an electric motor in said bed, a motor-pulley in said pocket, and a belt in said pocket connecting said motor and main-shaft pulleys.

3. A sewing machine having a frame including a box type bed and overhanging bracket-arm, said bed having one of its external end walls inset to provide external top and side wall bed extensions beyond the plane of said inset external end wall, a shaft journaled in said bed a and extending through said end wall, a pulley carried by said shaft exteriorly of said end wall, a motor disposed in said bed, a motor pulley in the plane of said first mentioned pulley, and a belt connecting said pulleys and guarded by said bed wall extensions.

4. A sewing machine having a frame including a box-type bed with external top, bottom, side and end walls, an overhanging bracket-arm, one of said external bed end walls being inset from the adjacent ends of the top, bottom and side walls to form a. wide open bed pocket, a mainshaft in said bed and having an outboard projection in said pocket, a pulley on said shaft in said pocket, said pulley being contained entirely between the planes of the top and bottom external walls of said bed, a motor in said bed, a motor-pulley smaller than said first mentioned pulley, said motor-pulley being driven by said motor at a reduced speed and disposed in said pocket, and a belt in said pocket connecting the motor and machine-pulleys.

5. A sewing machine having a box-type bed with inset external front and end walls affording wide open front and end bed pockets, a mainshaft journaled in said bed a motor housed in said bed, motor and main-shaft pulleys and a driving belt in said open end bed pocket, and a lever connected to said motor and having a terminal portion accessible in said open front wall pocket for shifting the motor to slacken the driving belt.

6. A sewing machine having a frame including a box-type bed and overhanging bracket-arm, said bed having an inset external wall providing a wide open pocket, a main-shaft joumaled in said bed and extending into said pocket, a driving motor housed in said bed, and driving connections between said motor and main-shaft, said connections including driving and driven belt-pulleys and a driving belt disposed in said pocket.

MAX L. WATERMAN.