US2318442A - Sewing machine - Google Patents

Description

May 4, 1943. D. D. wAY Erm. 2,318,442

SEWING IACHINE Carl R. Schenk May 4, 1943. D. D. wAY ErAL SEWING MACHINE Filed July 29, 1941 2 Sheets-Sheet 2 E 44 Je 6' 33 I 20 36 6,6, n

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Patented May 4, 1943 SEWING MACHINE Donald D. Way, Westileld. James M. Naul, Fanwood, and Carin. Schenk, Jersey City, N. J., assignora to The Singer Manufacturing Company, Elisabeth, N. J., a corporation of New Jersey Application July 29, 1941, Serial No. 404,444

14 Claims. (Cl. 112-220) This invention relates to sewing machines and more particularly to electric drives for sewing machines and has for its objective the provision of an improved, compact and simplified motor drive which is housed within the bracket-arm of the machine.

Another object of the invention is to provide improved means for mounting the motor within the bracket-arm and to provide a mounting that will secondarily insulate the motor from the sewing achine frame.

A further object of the invention is to enclose the driving beit, which operatively connects the motor to the driving pulley, within the confines of the bracket-arm standard and to provide means for adjusting the position o! the motor for the purpose of adjusting the tension of the belt.

A `ftiil further object of the invention is to provide a moulded flange of dielectric material which serves to support the motor and also the brushes for the motor, and to provide a support for the rotor of the motor which is compact and reduces the overall length of the motor so that it may be inserted in the bracket-arm with the motor shaft parallel to the needle-bar shaft.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations, and arrangements of Darts hereinafterset 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 drawings. Figure 1 is a side elevation.

partly in section, showing a sewing machine with our invention embodied therein.

Fig. 2 is an end elevation, partly in section, to show the motor mounting and the arrangement of the motor relative to the operating parts of the machine.

Fig. 3 is a fragmentary view showing the motor supporting flange.

Fis. 4 is an end elevation of the motor.

Fig. 5 is a perspective view of the brush-holder.

Fig. 6 is a sectional view taken through the standard oi the machine, and showing the motor in elevation.

In the embodiment of the invention selected for illustration, i0 represents the bed of a sewing machine of the lock-stitch type. Fixed to the bed I4 is a standard Il carrying an overhanglng bracket-arm i2 terminating in a hollcv head I3 in which the needle-bar I4 is Journaled.

The needle-bar i4 carries a needle Il and is actuated by a shaft I6 which is joumaled in suitable bearings formed in the overhanging arm, one of which is shown at I1. Fixed to the shaft l I6 is a gear I3 which meshes with a gear I3 xed to the upper end of a vertical shaft 20 journaled in the bearing 2l formed in the standard I I. The lower end of the shaft 20 carries a gear 22 which meshes with a gear 23 tlxed to the hook-shalt 24. The shaft I6 also carries the feed-lift and feedadvance ecc'entrics 23 and 25' which actuate the feed-lift pitman 26 and the feed-advance yoke lever 21 carrying the usual roller 21' which works in the usualslotted leed-regulating block 13- whlch is pvotaily supported on the web 33 by the pivot screw 14. The feed-regulating block 13 may be shifted in the usual manner about its pivot by a lever 15 to vary the amount of feed and return motion imparted to the feed-dog. The pitman 26 and lever 21 are adapted to actuate the feed-bar (not shown) through the feed-rockers 23 and 29. The above described sewing machine mechanism is al1 well known and further description is deemed unnecessary.

Fixed to the needle-bar actuating shaft I 3 by the screw 30 is a bushing 3| on which is lournaled a balance-wheel 3 2 formed with a belt pulley 33. The balance-wheel 32 is adapted, through the well known clutch 34, to rotate the shaft I4 and thus drive the sewing machine, or to rotate freely on the bushing 3| during the bobbn winding operations.

The standard of the machine is formed with flat side walls 35 and a fiat central wall or web 36 which is located between and connects the side walls 35 (Fig. 6). The wall 36 is provided with an aperature 31 into which is lltted an electric motor. Ihe motor comprises a plate 3l made of insulating material. such as Bakelite," and formed with a flange 33 which is adapted to rest against the marginal edge of the opening formed in the wall 36 of lthe standard. The flange 39 is formed with two ears 40 (Figs. 2 and 4) each of which is provided with elongated slots 4I through which one of the fastening screws 42 extends and enters a suitable threaded hole in the Wall 36. This arrangement permits the moto:` to be kadjusted towards and from the balance wheel 32 for the purpose of tightening the belt.

Secured to the insulating plate 33 by the screws 44 is the stator 45 and the end bonnet 46 which is apertured to receive the supporting tube 41. Journaled on the supporting tube 41 is a second tube 43 which supports and carries the rotor 43 and commutator 30. The stator 45, rotor 43 and commutator 30 are the same as those described and claimed in the patent to F. Diehl et al., No. 1,488,234, dated Mar. 25, 1924.

The free end of the tube 48 is threaded to receive a belt-pulley 52 which is operatively connected to the pulley 33 on the balance-wheel by a v-shaped driving belt 53. The plate 38 is formed with diametrically opposite slots 55 which receives the brush-holders 56, screws 51 being provided for the dual purpose of making the electrical connection to the brush-holders and holding the brush-holders in their operative positions. As illustrated in Fig. 5, each brush-holder comprises a single piece of sheet-metal, preferably brass, with its marginal edge bent to form a tube 58 which is square in cross-section, a lip 59 of the metal is bent over to close one end of the tube. It will be observed that the tube portion 58 of the brush-holder 56 enters the slot 55 in the insulation plate 38 and that the brushholders are easily accessible and readily removable for the purpose of inspection and repair.

For the purpose of lubrication, the end-bonnet 46 is formed with a protuberance 60 formed with a vertical aperture 6I (Fig. 4) which intersects with the bore in the supporting tube 41 and is adapted to contain wicking. One end of the tube 41 is closed by a screw 62 and the other end by a screw 63 which also serves to lock the driving pulley in position. The tube 41 is provided with apertures 64 through which oil is adapted to pass for the purpose of lubricating the bearing surface Abetween the tubes 41 and 48. To prevent the oil from escaping from the pulley end of the shaft and finding its way to the driving belt, we have formed the pulley 52 with a laterally extending flange 65 and have forced a cup-shaped cap 66 over the walls.

From the above description it will be observed that the web 36, together with the motor, form a partition which divides the standard II into two compartments. In the compartment to the left of the web, as viewed in Fig. 1, there is located the mechanism which operatively connects the lower and upper shafts of the machine, as well as the pitman 26 and lever 21 which operatively connect the shaft I6 with the rockshafts for actuating the feed. In' the other compartment there is located the driving connections between the motor shaft and the shaft i6. In order to provide access to the motor and belt the standard is closed by a plate 61 which is removably secured to the ends of the walls 35 by screws or any other suitable means. The plate 61 may be provided with a U-shaped cut out to receive the balance wheel and a second plate 68 provided for the purpose of closing'the compartment above the balance wheel. To provide access to the actuating mechanism in the upper part of the standard a closure plate 69 is fixed to the bracket-arm by a screw 10. The plate has pivotally secured thereto at 1| a spool pin 12.

' It will be obvious that the pin 12 may be moved about its pivot to a horizontal position overlying the plate 69 to reduce the overall height of the machine when it is desired to place it in a carrying case.

It will also'be observed that the motor is secondarily insulated from the metal machine frame by the moulded insulating plate 38 and that this plate also acts to support the motor, carry the motor brushes and permit the motor to be adjusted vertically for the purpose of tightening the drive belt.

From vthe foregoing description it will be ob- 1. In combination with a sewing machine having a frame including a standard formed with side walls, an overhanging bracket-arm, and a driving shaft journaled in the bracket-arm, a central web formed in said standard and connecting said side walls, said web being provided with an aperture, anelectric motor supported entirely by said web and located in said aperture with its shaft arranged parallel to the driving shaft, and a belt operatively connecting the motor shaft with the driving shaft of the machine.

2. In combination with a sewing machine having a frame Vincluding a standard formed with side walls and an overhanging bracket-arm, and a driving shaft journaled in the bracket-arm, a central web formed in said standard and connecting said side walls, said web being provided with an aperture, an electric motor supported entirely by said web and located in said aperture with its shaft arranged parallel to the driving shaft, a belt operatively connecting the motor to the driving shaft of the machine and a cover plate for enclosing the belt.

3. In combination with a sewing machine having a standard formed with side walls and an overhanging bracket-arm with a shaft journaled therein, a vertically arranged web formed within the standard and connecting said side walls, said web being provided with an aperture, a motor supported entirely by said web and located within the aperture and formed with a laterally exweb being provided with an apetrure, a motor` supported entirely by said web and located within the aperture, said motor being formed with a laterally extending ange made of dielectric material, means for adjustably securing said ange to said web and means for operatively connecting said motor to the driving shaft of the machine.

5. In a sewing machine having a hollow standard and a bracket-arm with a shaft journaled therein, a plate formed of insulating material and located Within the standard, means for securing said plate to the frame of the machine, a stator and a motor end bonnet carried by said insulating plate, a stationary tube extending from said end bonnet, a rotor journaled o n said tube, a pulley actuated by said rotor, andY means fir frperatively connecting said pulley with said s a 6. In a sewing machine having a hollow standard and a bracket-arm with a shaft journaled therein, a plate formed of insulating material4 and located within the standard, means for securing said plate to the frame of the machine, a stator and a motor end bonnet carried by and at one side of said insulating plate, brush holders secured to the other side of said plate, a supporting tubular memberv extending from said end bonnet, a rotor journaled on said tubular member, and means for operatively connecting said rotor to the driving shaft of the machine.

7. In combination a sewing machine having a frame including a hollow standard carrying an over-hanging bracket-arm, said standard having side walls connected by a vertically arranged web which is located intermediate the ends of the walls to form two compartments, a motor located in an opening in said web and having a horizontally arranged girlie* shaft, a pulley carried by the drive shaft of said motor, Va needle-bar shaft journaled in the bracket-arm parallel to the motor shaft, and a belt operatively connecting said pulley with a pulley on said needle-bar shaft, said belt and pulleys being located within one of the compartments of the bracket-arm.

8. In combination, a sewing machine having a bed and an overhanging bracket-arm, a standard connecting said bed with the bracket-arm, said standard having two longitudinally arranged compartments with a partition therebetween, a shaft journaled in the bracket-arm, shafts journaled in the bed, operative connections located in one ot said compartments, an electric motor secured to the partition and having a driving shaft, and operative connections between the motor shaft and the shaft journaled within the bracketarm, said connections being located within the other compartment.

9. In combination, a sewing machine having a bed and an overhanging bracket-arm, a standard connecting said bed with the bracket-arm, said standard having two longitudinally arranged compartments with a partition therebetween, a shaft journaled in the bracket-arm, shafts journaled in the bed, operative connections located in one oi.' said compartments, an electric motor located Within an opening in the partition between the compartments and having its drive shaft parallel to the shaft in the bracket-arm, and operative connections between the motor shaft and the shaft journaled within the bracket-arm, said connections being located within the other compartment.

10. In combination, a sewing machine having a bed and an overhanging bracket-arm, a standard connecting said bed with the bracket-arm, said standard having two longitudinally arranged compartments with a partition therebetween. a shaft journaled in the bracket-arm, shafts journaled in the bed, operative connections located in one of said compartments, an electric motor located within an opening in the partition between the compartments and having its drive shaft arranged parallel to the shaft in the bracket-arm, a pulley on the motor shaft, a pulley on the shaft journaled in the arm, a belt operatively connecting said pulleys, said pulleys and belt being located within the other compartment.

11. In combination, a sewing machine having a bed, a hollow standard and an overhanging bracket-arm, said standard being formed with side walls and a web connecting said walls intermediate the ends thereof to form two compartments, actuating mechanism located in one of said compartments, a motor carried by said web and driving means for operatively connecting said motor to the sewing machine, said driving means being located within the other compartment.

12. In combination, a-sewing machine having a bed, a hollow standard and an overhanging bracket-arm, said standard being formed with side walls and a web formed with an opening and connecting said walls intermediate the ends thereof to form two compartments, shafts for actuating sewing machine instrumentalities journaled in the bed and bracket-arms, actuating mechanism connecting said shafts and located in one of the compartments, a motor located in the opening in the web and having its shaft arranged horizontally and means located in the other compartment for operatively connecting said motor shaft to one of the sewing machine shafts.

13. In combination, a sewing machine having a bed, a hollow standard and an overhanging bracket-arm, said standard being formed with side walls and a web formed with an opening and connecting said walls intermediate the ends thereof to form two compartments, shafts for actuating sewing machine instrumentalitles journaled in the bed and bracket-arms, actuating mechanism connecting said shafts and located in one of the compartments, a motor located in the opening in the web, and formed with a flange which is adapted to engage the web along the edge of the opening, means for adjustably securing said flange to the web, and means located in the other compartment for operatively connecting said motor shaft to one of the sewing machine shafts.

14. In combination, a. sewing machine having a. bed, a hollow standard and an overhanging bracket-arm, said standard being formed with side walls and a web connecting said walls intermediate the ends thereof to form two compartments, actuating mechanism located in one of said compartments, a feed adjusting mechanism located in said compartment and pivoted to said web, a motor carried by said web, and means for operatively connecting said motor to the sewing machine actuating mechanism, said means being located in the other of said compartments.

DONALD D. WAY. JAMES M. NAUL. CARL R. SCHENK.

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