US2707447A - Sewing machine - Google Patents

Description

May 3, 1955 F. sENGsTocK 2,707,447

SEWING MACHINE 'Filed Inlay 21, 1952 2 Sheets-Sheet l e au M 45 @i l `o Z l l 49 l, 33

May 3, 1955 F. sENGsTocK 2,707,447

SEWING MACHINE Filed lay 21 1952 I 2 Sheets-Sheet 2 :llllllll- INI/NTOR. F fea/wr f/vasroC/f United States Patent O SEWING MACHINE Friedrich Sengstock, Biebernhem, Germany, assignor of fifty per cent to Bernhard Sengstoek, Brooklyn, N. Y.

Application May 21, 1952, Serial No. 289,176 7 Claims. (Cl. 112-1S4) The present invention relates to stitching and sewing machines for textiles, and particularly to a special table sewing machine.

The main object of our invention is to provide a table sewing machine that is exceptionally capacious and versatile in utility for sewing all kinds of textiles with ease.

Another object is to provide such a sewing machine that has such an advantageous construction that a more free manipulation of the fabric being sewn is possible than is usually the case on conventional machines.

A further object is to have such a sewing machine provided with an especially simple drive mechanism that facilitates operation of the machine as a whole.

It is also an object of our invention to include in the construction of our sewing machine a special housing or frame that is particularly advantageous to allow inclusion of the special simple drive mechanism and provide ample space for voluminous fabrics and articles to be sewn in order to impart an especially wide field of operation to the machine.

Yet another object is to have such a sewing machine that contains the main portion of the drive within a compact drive housing that extends upward a limited distance and provides the sewing zone upon the top of the same, thus avoiding the necessity for a stand or the like forthe machine, to contain any part of its mechanism.

A practical object is, of course to provide a table sewing machine that is simple to make and as simple to use, as well as virtually portable and reasonable in cost.

Other objects and advantages of our invention will appear in greater detail as the specification proceeds.

In order to facilitate ready comprehension of this invention for a proper appreciation of the salient features of the same, the invention is illustrated on the accompanying drawings forming part hereof, and in which:

Figure l is a side elevation of a table sewing machine made according to the invention and embodying the same in a practical form, the View being partly in section;

Figure 2 is an enlarged vertical section of the lower left housing of Figure l disclosing details of construction;

Figure 3 is a top plan view of the same mechanism housing of Figure 2; and

Figure 4 is an enlarged top plan View of the thread carrier and spool of the machine of Figures l, 2 and 3.

Throughout the views, the same reference numerals indicate the same or like parts and features.

Upon conventional sewing machines, certain limitations are always in evidence, such as a narrow throat or space for the textiles to be sewn, due to the nature of the mechanism of such machines, and also, below the sewing zone, the machines of conventional type require to have the shuttle mechanism depressed into a stand top or table of some kind, and a motor drive, if used i`s substantially always an exposed feature as though it were an after thought.

Upon considering this problem, it has occurred to us that a sewing machine should have a large space for handling the goods to be sewn and should also have its mechanism designed to be located within a compact housing and avoid having too much mechanism` requiring a sewing head. As a result, we have succeeded in producing a special table sewing machine as already outlined, which we shall now proceed to describe in detail in the following,

Hence, in the practice of our invention, and referring also again to the drawings, an elongated base 1 is adapted to be placed upon a table or other support, and at the one end has an arcuate hollow arm 2 extending upwardly therefrom and arching over and down toward the other end of the hase. At the latter end, the base is provided with a special housing 3 which may be more or less cylindrical in outline and having a pair of substantially horizontal or level fabric feeders 4, while above these feeders, the arm 2 terminates in a depending end S. The space between the end 5 of arm 2 and the top of housing 3 above feeders d may be termed the sewing zone, as will be further referred to later on.

Within the mentioned housing is mounted an electric motor 6 that serves to drive the machine as a whole, ln the bottom of the housing 3 and forming part of the base 1, is also mounted a bottom bearing '7, and within the upper portion of the same housing is rotatably mounted an upper head 8 upon the motor shaft 9. The conductors to the motor are omitted for clarity, inasmuch as they are, of course understood to be connected thereto through the housing to supply current, and like remarks refer to the starting and running switch, also superuous to illustrate. The vertical motor shaft 9 carries a rigidly xed hollow cone-shaped cam 10 having a continuous double looped groove lll upon the exterior surface thereof in which a follower finger 12 slides. This follower finger is securely xed upon one end of a long arcuate needle har driving link 13 located within the hollow arcuate arm 2 and in the upper far portion of this arm having an offset reinforced part 42 with a limited longitudinal slot 43 through which a stationary guide member i4 secured in arm 2 extends slidably to ensure that link 13 is supported movably in the same general position.

Midway up within arm 2 is pivotally mounted a forked arm 15 upon a pivot pin or stud 44 with the transverse pin 45 in link 13 located in the slot 46 in arm 15. The latter arm may be resiliently mounted or have one or more springs engaging with it to provide resilient resistance to movement of the arm on its pivot 44 and thus prevent undue movement of link 13 except as positively provided by the follower 12 riding in cam groove 11 during rotation of conical cam lll by motor shaft 9.

At the offset or elbow 42, the arm continues as an olfset needle bar i6 which virtually forms one end of the cam and follower driving link i3, while the other end 17 of the link is directly connected to follower member 12 within housing 3. To the end of needle bar 16 is connected a needle 18 adapted to be brought down between the feeding members 4 already referred to, by longitudinal oscillation of link i3 and bar 16 caused by rotation of cani lll. ln order to guide the needle iS and prevent outward misoperation thereof during the running of the machine, a guide roller or wheel i9 is mounted rotatably on the operating end of arm outside end S. As may be noted in Figure l, the needle 13 has a slight curvature corresponding to the curvature of hollow arm 2, and may be triangular in cross section, if desired and lit into a corresponding triangular groove in needle bar i6, and a pin or set screw may be added to further secure it in place, if desired.

ln the upper portion 47 of the mechanism housing 3 supporting upper bearing 8 is also supported a bobbin carrier 20 containing a special bobbin 21, and, as best seen in Figure 4, the thread is provided to the sewing Zone through the opening or gap 4S of carrier 2t) and drawn from bobbin 21 to mesh with the thread coming down from needle 18, the bobbin rotating about a vertical axis in carrier 20 when the thread is withdrawn during sewing. For the needle thread supply is provided a stud 35 upon the near side of the upper portion of arm 2 upon which a supply spool may be mounted, while a thread puller or feeder adjustment 34 is mounted on the elbow or offset 42 of link 13 and extends through a slot 49 in the wall of arm 2 to the outside into accessible position on the arm. A thread tensioning device 33 is fixed on the arm 2 near the end 5 thereof for the thread, which is led through the thread guide loop 32 on the offset 42 and extends out through a slot Si) upon arm 2.

A presser foot 36 extends down toward feeders 4 and within arm 2 is connected to needle bar 16, a manual lever 37 also extending into the arm 2 and connecting with bar 16 for manually adjusting and moving the bar when desired, it being evident that the presser foot extends slidably through end 5 which serves as a bearing for the same. Upon the shank of the presser foot is fixed a transverse pin 51, while upon this shank is also mounted a compression spring 52 working against a stop 53 fixed on bar 16 which slidably supports the presser foot 36, to balance the movement of the presser foot with bar 16.

Within the upper portion of cone cam 1i) is a socket 54 in which is loosely mounted a flanged rotatable shell 38 held downresiliently by a spring 55 mounted on shaft 9 between the upper head 8 and the bottom of shell 38, so that the latter would normally tend to rotate with the Cone 10 by friction. In upper portion 47 of housing 3, that may be a metal casting, is rotatably mounted a vertical shaft 39 upon the lower end of which is fixed a iiange or wheel 40 with an inclined or beveled edge capable of frictionally engaging with the beveled edge or flange of shell 38 and be rotated thereby to form an upper rotary vstop therefor. During operation, spring 55 tends to raise `head 8 into frictional contact with the underside of stitch forming shuttle to rotate the latter and cause it to cooperate with needle 18 to form a stitch.

Within the side wall of housing 3 is mounted a pivot mounting 26 upon which the end of a lever 25 is pivoted so that its other slotted end 27 may swing up and down as caused by a transverse pin 56 in the end 17 of driving link 13. An upwardly extending arm 29 is rigid with lever and rocks therewith on pivot 26 and engages against an inclined cam portion 31 by its upper end 30, this cam portion being fixed upon and disposed at right angles to a movable feeder plate 22 upon which the feeders 4 are fixed, whereby a reciprocating movement is imparted to the feeders. This plate 22 is supported upon an upright arm 23 that is slidably supported at its lower end upon a post 24 having guide flanges S7, 57 for guiding arm 23 in movement. The upper plate 22 is guided by a depending rib 59 upon the underside of housing top S8 for to and fro movement provided by the cam 31 being engaged by end of arm 29 of lever 25 which rocks with the movements of link 13 with follower 12 in groove 11 on cone cam 10. This groove, as best seen in Figure 4 has a low loop 60 and a high loop 61 which are both traversed in succession by follower 12.

In an intermediate portion of upright arm 23 is mounted a pivot member 28 operating in a slot 62 in lever 25 in such manner that independently of the fore and aft movement of the plate 22 and feeders 4 thereon provided by arm 29 with cam 31, the plate with feeders 4 will also be slightly raised and lowered by the rocking of lever 25 on its pivot 26 when raised and lowered at its slotted end 27 by pin 56 at follower 12.

The machine may be provided with a control knob 41 on arm 2 which may house a starting switch operated by knob 41, if so desired, or any other arrangement may be used for controlling operation of motor 6 and the machine as a whole.

From the foregoing, it is evident that the invention provides a large gap or throat of substantially circular form within the outline of arm 2 for handling large pieces of goods and various shapes and sizes thereof. It is also evident that there is no complicated or clumsy operating head involved because the mechanism as a whole is almost entirely located in the lower housing 3, and the mechanism is more compact and also more simple in construction and nature than conventional sewing instrumentalities. The view of the fabric being sewed is more exposed to the eyes of an operator than on conventional machines, likewise, due to the absence of the usual sewing head. The whole machine may thus rest directly upon a table or similar support, and is very simple to operate.

Manifestly, variations may be resorted to, and parts and features may be modified or used without others within the scope of the appended claims.

Having now fully described my invention, I claim:

1. A table sewing machine including a base adapted to rest on a table or other support, a substantially circular hollow arm rigidly mounted upon the base and having a gap forming a sewing zone above one end of the base, a motor drive located at said one end of said base, a housing upon said end of said base and enclosing the motor drive, a rotatable cam mounted to rotate about a vertical axis and driven by the motor drive within the housing, the hollow arm terminating at the gap forming the sewing zone above said housing, a needle bar longitudinally reciprocable within said arm `toward and away from the sewing zone, a follower co-operating with said cam in said housing, an arcuate operating link connected at one end to the follower and extending movably throughout the greater portion of the hollow arm and at the other end being connected to the needle bar, and a presser foot movably connected to the needle bar having resilient means located between a portion of said needle bar and said presser foot causing the presser foot to bear resiliently on the fabric at the sewing Zone when the needle proceeds to penetrate said fabric.

2. A sewing machine according to claim 1, wherein the cam is a cone shaped rotary continuous cam having a cam groove about the external surface thereof, the follower operatively engaging with the cam groove to cause movement of said follower, and wherein the upper portion of the housing has a support with a bobbin carrier and thread bobbin movably mounted in the said bobbin carrier, said bobbin carrier being mounted upon said support above said cam.

3. A sewing machine according to claim 2, wherein a thread tensioning device is mounted on the arm adjacent to the gap above the sewing zone and the operating link at its junction with the needle bar has an outwardly projecting thread guide loop extending to the outside of the hollow arm and also has a thread puller or feeder mounted thereon likewise extending externally on the hollow arm in accessible position for positioning the thread, while a spool support is fixed upon an intermediate portion of said hollow arm for supply of thread for the needle, tensioning device and thread loop.

4. A sewing machine according to claim 3, wherein the hollow arm at an intermediate position has a pivotally mounted forked arm therein and the arcuate operating link has a corresponding pin engaging transversely in the forked portion of said forked arm, and resilient means mounted in said hollow arm in contact with said forked arm for resiliently resisting rocking of Said forked arm by movement of said operating link.

5. A sewing machine according to claim 3, wherein a transverse pin is iixed on the operating link adjacent to the end connected to the cam follower, and a lever is pivotally mounted at one end within the housing while the other end has a slot to engage with said transverse pin 75, to rock the lever during rotation of the cam, and wherein a feeder plate is movably supported Within said housing and feeder means extend upon the upper portion thereof exposed at the sewing zone beneath the needle and presser foot, a side cam of inclined form being Xed on said plate, and wherein an arm is fixed on the lever at its pivoted end engaging against the inclined cam on said plate to shift the same with its feeder means to and fro beneath the presser foot during operation.

6. A sewing machine according to claim 5, wherein a depending portion extends from the feeder plate and a t,

sliding support located in the housing, while a pivot member is disposed on the depending portion of the feeder plate and the operating lever has a corresponding slot with which said pivot engages in order to raise and lower said plate with the rocking motion of said lever caused l by movement of the operating link and follower when the cone cam rotates.

7. A sewing machine according to claim 6, wherein an upwardly open socket is mounted upon the cone cam, a

flanged shell loosely mounted in the socket, a spring in contact with and urging said shell down into said socket, a vertical shaft rotatable in the upper portion of the hous ing, a flange on the lower end of the shaft frictionally engageable with the upper edge of said shell in effective position to be rotated thereby to form an upper rotary stop for said shell, and wherein a head is mounted upon the motor drive shaft above said shell and albove the spring in effective position to be raised during operation by said spring into frictional contact with the underside of the thread carrier to rotate the same about a vertical axis and actuate it effectively to co-operate with the needle to form stitches.

References Cited in the le of this patent UNITED STATES PATENTS

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