US2561643A

US2561643A - Sewing machine

Info

Publication number: US2561643A
Application number: US693914A
Authority: US
Inventors: Adler Solomon
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-08-30
Filing date: 1946-08-30
Publication date: 1951-07-24
Anticipated expiration: 1968-07-24

Description

y 24, 1951 s. ADLER 2,561,643

SEWING MACHINE,

Filed Aug. so, 1946 7 Sheets-Sheet 1 v I 1 N V E N TOR. "Sub/r1021 191/!!! "F? H i W ATTORNEYS 7 Sheets-Sheet 2 INVENTOR.

'IATTORNEIS' S. ADLER SEWING MACHINE July 24, 1951 Filed Aug. so, 1946 1 g 6010mm fld/r y M/ M Iii-w y 24, 1951 s. ADLER 2,561,643

SEWING MACHINE Filed 1946 7 Sheets-Sheet 5 kg Jalamm fld/m' 11; $1440 Ma 54am ATTORNEYS July 24, 1951 s. ADLER' 2, 1,

SEWING MACEHINE Filed Aug. 30, 1946 7 Sheets-Sheet 4 A TTORNE Y5 July 24, 1951 s, ADLER 2,561,643

SEWING MACHINE Filed 50. 1946 7 Sheets-Sheet 5 1! TTORNE YS s. ADLER 2,561,643

SEWING MACHINE 7 Sheets-Sheet 6 Filed Aug. 30, 1946 July 24, 1951 July 24, 1951 s. ADLER 2,561,643

SEWING MACHINE Filed Aug. 30, 1946 '7 Sheets-Sheet 7 ATTORNEYS Patented July 24, 1951 UNITED STATES PATENT OFFICE SEWING MACHINE Solomon Adler, Kew Gardens, N. Y. Application August 30, 1946, Serial No. 693,914

29 Claims. (01. 112-258) This invention relates to a structurally and. functionally improved sewing machine and especially a machine which will be suitable for household use.

A primary object is the provision of a, compact, sturdy and practically foolproof machine, of small overall dimensions. A further object of my invention is the provision of a sewing machine, which, notwithstanding its small dimensions, has sufficient underarm space to carry out all kinds of sewing and darning operations without obstruction by the arm or other parts of the machine.

A further object is the creation of a machine with an adjustable arm which will permit any desired variation of the underarm space.

' A still further object of my invention is to provide a completely self-contained machine which, though occupying a very small space, has all its essential parts contained within one general frame and cover structure, and therefore, lends itself to use as a portable machine.

Other objects and advantages reside in certain novel features of the construction and arrangement which will be more fully described hereinafter. This description will be made with reference to the accompanying drawings, of which:

Fig. 1 is a front elevation of the machine with the cover plates attached, the expanded position being indicated by dot and dash lines;

Fig. 2 is a front elevation, partly in section, and, similarly to the following figures, with the cover plates removed;

Fig. 3 is a plan view of the machine;

Fig. 4 is a horizontal section taken along the lines 4-4 and in the direction of the arrows as indicated in Fig. 2;

Fig. 5 is a vertical section taken along the lines 5.--5 and in the direction of the arrows as indicated in Fig. 3;

Fig. 6 is an end view of the extension cord drum;

Fig, 7 is a horizontal section taken along the lines 1-! and in the direction of the arrows as indicated in Fig. 6;

Fig. 8 is a vertical section taken along the lines 8-8 and in the direction of the arrows as indicated in Fig. 2;

Fig. 9 is an enlarged fragmentary perspective view of the expansion lever and actuating shafts;

Fig. 10 is a plan view partly in section, illustrating, somewhat in diagrammatical form, the position taken by the slideable shafts and frames when the machine is in a partially expanded position; and

Fig. 11 is a circuit diagram.

Referring to the drawings and in particular to Figs. 1, 2 and 3 it will be seen that the machine has a base and top portion and is provided with a plural section frame comprising a stationary I base frame with front and rear plates I and 2,

end plate 3, a transverse web 4, and a movable frame of box-like form. This consists of front and rear members 5 and 6, a transverse web I and

end plates

8 and 9. The movable frame is supported by wheels W, while the stationary frame rests on feet F.

Carried by the stationary frame of the base portion are vertical standards It! and Illa, which support a narrow horizontal track plate I I, which may be formed integrally with its supports. This horizontal track member, together with the transverse webs Ila and Nb, forms the stationary frame structure of the upper section of the machine. Underlying the track and embracing its two lateral edges is a plate I3 which on its upper side, has two inwardly slanting flanges so as to embrace, and slidingly fit over, the edges of the track plate, as is best shown in Fig. 8. At its front end the slide plate carries the mechanism of the needle bar 93, thread take-up 94 and presser foot 91 and its two sides are formed with transverse webs I2, I2a and I 21), straddling the track plate I I (see Fig. 2).

The machine is operated by a small sized electric motor contained within the stationary frame and generally designated M. The motor drives the machine through a motor shaft and gear I4 and the transversal shaft, termed head shaft I5, see particularly Figs. 3 and 4. Generally, the arrangement is such that the head shaft is connected through intermediate shafts and gears, which will later be described in detail, to the main drive shafts I9 and I 9a, separate shafts being provided for the lower and upperportion of the machine. These main drive shafts alternatively operate the stitching and feed mechanism and the expansion-contraction mechanism.

The embodiment shows the head shaft as having a sliding fit in a bushing I 6. A clutch collar I6a. is provided on the shaft to bring it into or out of engagement with the main drive shaft while one or th other of two auxiliary mechanisms is operated. One of these serves as a threading device, generally indicated by the letter T, and the other operates a bobbin winder, generally designated B. These devices are not claimed and are only briefly referred to herein.

The bushing I6 supports a bevel gear Ma which meshes with the gear of the motor shaft while the head shaft at its front end is provided with 3 two oppositely disposed bevel gears l1 and I8. The lower drive shaft is likewise provided with two oppositely disposed bevel gears 22 and 23 (Fig. 4) and the corresponding upper drive shaft l9a carries an end bushing 2| provided with a bevel gear 22a (Figs. 2 and 3). The operating connection between the upper and the lower main drive shaft is established by a vertical shaft 25 which has bevel gears 26 and 21 at its two ends. By sliding the head shaft transversely of the machine the bevel gear 18 of the stitching and expansion mechanism or the gear I! and asso-,

ciated shaft Ha. of the threading mechanism can alternatively be brought into engagement.

The two drive shafts are journaled in bushings seated in the transverse webs of the stationary I chassis. 7 members which are keyed to each other by a slot and spline so that the outer member slides lengthwise on the inner shaft but is secured to it against relative rotation. The

outer members

28 and 28a are provided over substantially their entire length with a left and right hand thread constituting an endless spiral groove for purposes to be explained. The lower drive shaft also carries at its extreme right hand end a hand wheel 24 for occasional manual adjustment of the device.

Parallel to each main drive shaft is a rotary shaft Whichherein will be termed the actuating shaft. These shafts are designated 30 and 30a and, like the drive shafts, are provided with telescoped outer members 3i and 3m. The actuating shafts are preferably of rectangular shape and adapted to oscillate when given a twist by the crank arms 60 and 62 (see Fig. 9).

Overhanging the actuating shaft, both at the base and at the top structure, are housings 33 which are secured to the stationary part of the machine and which are formed alike in the base and top portion of the machine. These parts of the machine are best illustrated in Fig. 8. Each housing has a cavity in which a carrier member 32a is adapted for movement transversely of the longitudinal axis of the machine. The carrier member at its front end carries a spindle 33a to which a curved shoe 32 for engagement of the threaded slide shafts is secured. The spindle rotates about an axis perpendicular to the axis of the slide shafts. The carrier 32a. is rearwardly provided with a tension spring 34 which at its other end is attached to the housing 33. A rocker arm 35, carried by the actuating shaft, is adapted to engage the rear face 36 of a substantially rectangular recess in the carrier. The-carrier, also, has a vertical block-like extension 31 which is adapted to move in a corresponding slot of the housing 33.

This part of themechanism functions so that, when the actuating shaft is given a fraction of a turn, the rocker arm 35will become disengaged from the rear and swing towards the front of the carrier and will thus permit the spring to press the carrier towards the threaded shaft. This will bring the shoe 32 into engagement with the thread of the drive shaft and, at the same time, free the lock block 31 from the L-shaped latches 39 (Fig. 4). These are provided at the transverse webs of the frame in order to prevent accidental shifting of the parts when the machine is tilted.

The contact face of the shoe 32 should be dimensioned to embrace a comparatively long stretch of the helical groove and, preferably, should have an oblong form with its ends curving toward the thread. This will enable the shoe Either shaft consists of two telescoped 4 to form a sliding fit in any part of the groove without becoming wedged at the intersection points. The proper engagement with the intersecting grooves is further facilitated by the rotatable seating of the shoe which assures an easy switch from one groove to the other upon reversal of the operation.

It will be understood that in this way, an axial feeding movement is obtained upon rotation of thedrive shafts l9, lQa, and'their-threaded

outer members

28, 28a and that the endwise moving thread shafts, as it were, carry the movable frame structures with them, as generally illustrated in .lFig, 10. thus effecting the expansion or contraction of the machine.

A separate mechanism is provided for locking the shoe inengaging position during expansion and contraction and for tripping the machine at the conclusion of the operation. To this end,

for example the upper actuating shaft, carries a notcheddisc 4| (see Fig. 5). A pawl lever 43 is pivoted to an arm 54 of the stationary part of the machine forcoaction with the disc. The lever at its rear end has a protruding stud 44. This stud is seated in a groove 48 of the member 41. The latter, part is adapted for swiveling about an axis 5|. A rocker shaft 45 extends parallel to the main shaft and carries a tongue 49 for engagement of the rocker 41. The rocker shaft 415 is lengthwise slideable in journals set into the transverse webs of the stationary chassis and, as appears from Figs. 2 and 3, is provided with a stop collar 52 close to its forward end and a shoulder 53'close toits rear end. Upon expansion or contraction, the collar or, respectively, the shoulder, will be engaged by the transverse end web l2 of the moving top frame, thus imparting a slight lengthwise shift to theshaft. This movement is transmitted by the tongue 49 to the rocker and is sufficient to overcome the force of the spring arm 42 which tends to keep the rocker at rest. The stud which normally is held within the confines of the groove by the thrust of leaf spring 50 against lever 43 will be unseated' thereby andwill be forced onto the'raised rim portions which border the groove 48 on either side. This, in turn, will lift the pawl lever and thus disengage the pawl from the notched disc.

It will be appreciated that while the locking of the actuating shaft is accomplished when it receives a slight turn at the commencement of the expansion or contraction, the release takes place automatically when the stop collar and shoulder are contacted by the moving transverse web upon termination of the operation.

Special provision is made for disengagement of the stitching mechanism during expansion and contraction. For this purpose, the

drive shafts

28 and 28a are provided at their-forward ends with clutches 61 and 5.1a, shown in Figs. 3 and 4. Clutch E3! constitutes the connection to the-short shaft-of the upper portion of the machine. This shaft establishes thev op'e'rating'connection with the needle bar 93 and thread take-up94. Clutch 6.1a connects". with the short shaft of the base portion which drives thefeed and the hook or shuttle 96 of the lower thread. Otherwise, the clutch mechanism is the same in the base and the top part of 'the'machine. On each actuating shaft is: provideda crank arm. 63 which has an inclined slot 64 (Fig. 9)-for receiving the crank pin 55 of the clutch lever 66. Oscillating the'crank armin a vertical plane imparts to the clutch lever 'a movement in a horizontal plane about the pivot 66a and forces the clutch collar 69 69a to move 60 with the upper actuating shaft.

.impelling a ratchet 13.

, 5 forwards or rearwards. The engagement or dis engagement of the clutch is thus eifected by the rotation of the actuating shafts.

To start the machine on its expanding and contracting movement, it is only necessary to press the lever 56 after releasing the spring actuated safety latch 560.. As shown in Fig.9, a pinion 51 is provided on the lever shaft 55 which engages two rack bars 53 and 5e. Therack bars are disposed atopposite sides of the pinion and, therefore, move in opposite directions upon turning of the shaft. Rack 59 connects through crank arm Rack 58 is of an L-shaped form and is connected through link BI and crank arm 62 to the lower actuating shaft. By virtue of this positive connection, looking of only one actuating shaft, as described above, will alsoarrest the'other actuating shaft inthelocking position.

To start the motor, separate circuits and switchesare provided both for the stitching operation and for expansion-contraction. A third circuit with two switches, S2 and S3, supplies current to the threading mechanism.

The switch for the stitching ,operation will first 2 be described. This switch is constituted by a rheostat R so as to permit of an adjustment of the motor speed. The rheostat is illustrated in turn, is pivotally connected with the contact arm 16 of the rheostat. A spring Tl tends to push this contact arm outwardly. Upon action of the pawl, the ratchet is advanced step by step and to the same extent is the contact arm of the rheovstat shoved inwards against the pressure of the spring. A calibration drum '8 indicates the position of the ratchet. The drum is keyed to the ratchet shaft and its scale is visible from the outside. A second pawl arm 80 is pivoted to the rod 8|, connecting it through link 82 with the toggle 83. The toggle linkage is ordinarily held under tension by spring 84 so that the pawl 19 prevents the ratchet from backward rotation.

When the toggle 83 is actuated, the ra tchet is released and permitted to return to its original position.

As has been set out before, the expansion-contraction is started by the lever 56. This lever, by means of the crank 85 and the spring 85, is normallykept in the off-position. When turned on, it imparts amover'nent to the two-pronged arm 81 which is fulcrurned on the lever shaft 55, see

Fig. 9. The prong arm 81' then contacts the spring contact 89 of the expansion switch SI which starts the motor. Attached to theother prong arm 88, is a cable 90, which over a pulley 9|, is connected with a latch 92 (Fig. 5); The

latch swings in a horizontal plane and, when pulled in position by tightening of the cable 90,

enters with its forward end the space belowthej'u plunger of the elbow control. This arrangement prevents the operator from interfering with the speed of expanding by actuating the rheostat. It

will be appreciated in this connection that an adjustment of the speed is desirable only during thev stitching operation while the expansion and contraction should proceed at a set rate of speed.

The shutting off of the motor at the end of the expansion or contraction effected automatically since switch SI is opened as soon as thespririg 86' 75 returns the expansion lever to its off-position, which will occur when the upper actuating shaft which prevents retrograde movement of the rack bars and pinion is released.

The electric cord providing the electrical connection between the motor and the power supply is wound on adrum 2l6 which has a spring mechanism for automatic rewinding. Preferably, the spring mechanism includes a ratchet and cam combination (not shown) for unwinding of the cord and locking of the drum at any desired point in the same manner as in the case of a sun shade. The drum is also provided with an outside collector plate 2|! which is separated from the metal drum by an insulating plate 2l8. A spring pressed brush 2!!) is provided on the frame and, by means of this brush, current is constantly fed to the collector plate no matter in what position the drum is placed. The extension cord is electrically connected to the drum and is, therefore, always supplied with power, both during rotation of the drum and when the drum is not in use.

In summing up the operation of the machine, it will be noted that turning of the expansion lever 56 performs a plurality of functions. The slide shoes are put into engagement with the right and left hand thread of the drive shafts. The lock blocks which are disposed on the shoe carrier are disengaged from the locking lugs. The clutches of the drive shafts are actuated for disengagement of the feed and needle bar mechanism. The trip mechanism is placed in condition for operation at the end of the expansion or contraction by locking the upper actuating shaft. The switch SI is closed and, at the same time, the rheostat is locked.

It will also be noted that the lever need be actuated only in order to start the expansion or 0 contraction. The termination of the expansion or contraction mechanically performs the following: The trip mechanism is actuated and the notch of the upper actuating shaft is released. This also frees the lower actuating shaft. Thus, both slide shoes are disengaged from the threads of the drive shafts and the shoe carriers are locked behind the L-shaped lugs. The clutches are reengaged, connecting the stitching mechanism again with the main drive shafts. The spring 86, after release of the actuating shafts, returns the expansion lever to its original position. This, in turn, closes the expansion. switch of the motor by disengaging the switch lever from the contact spring and unlocks the stitching switch by pulling of the latch under action of the cable connection.

While I have shown one particular embodiment of my invention, it will be understood that numerous modifications are possible in the construction of the machine without departing from the spirit of the invention. It should in particular be manifest, that the invention is not necessarily limited to a machine of the lock stitch type which has been chosen in the drawings and description for purposes of illustration only. I, therefore, do not wish to be limited otherwise than by the language of the appended claims.

I claim:

1. In a sewing machine, an arm consisting of a vertical and a horizontal portion, a needle bar mounted by the free end of the horizontal arm portion, the said horizontal arm portion comprising a stationary carrier member and an 1 expansion member supported by the carrier membenthe needle bar being secured to the ex- 7 pansion member and manually controlled means exteriorly of said machine and operatively connected to the expansion member for axially shifting the same relative to the stationary carrier member.

2. In a sewing machine, an arm consistin of a vertical and a horizontal portion, a needle bar mounted by the free end of the horizontal arm portion, the said horizontal arm portion comprising a stationary carrier member and an expansion member lengthwise movable on the carrier member, the needle bar being secured to the said expansion member, and manually controlled means exteriorly of said machine and operatively connected to the expansion member to impart to the latter an endwise movement, in a substantially horizontal direction, so as to adjust the available under arm space.

' 3. In a sewing machine, a base portion, an arm of the general form of an inverted L, a

needle bar and thread take-up, carried at the free horizontal end of the arm, stitching elements disposed in the base portion, the said arm comprising a stationary carrier member and a movable member supported by the carrier member to provide an expansion member, the needle bar and thread take-up being secured to the expansion member, means for imparting an endwise movement to the expansion member, means to adjust the position of the said stitchin elements in correlation .to the position of the said needle bar and thread take-up and means common to the position-adjusting means of the stitching elements and the endwise movement imparting means for the expansion member to simultaneously shift both of the same.

4. In a sewing machine, a base portion and an arm of generally inverted L shape, a needle bar and thread take-up carried at the free end of the arm, stitching elements disposed in the base portion of the machine, a drive shaft for the said needle bar and thread take-up, a second drive shaft for the said stitching elements, the

said drive shafts comprising telescoped members adapted for relative sliding movement, and common control means for lengthwise varying the position of the needle bar and thread take-up and of the stitching elements by sliding said telescoped members upon each other.

5. In a sewing machine, a plural section frame comprising a stationary and a movable portion, an arm of generally inverted L shape rising from said stationary portion, the arm comprising a stationary carrier member and a movable expansion member slideable on it, stitching and feed mechanisms carried by the movable frame portion and by the said expansion member, and rotary drive shafts for both the said stitching and feed mechanisms; the drive shafts bein adapted for lengthwise expansion simultaneously with moving the movable frame portion and the slideable expansion member.

6. In a sewing machine, a base and a top portion, a vertical standard connecting the. two

portions, each portion comprising a stationary chassis and a relatively movable framework associated therewith, cooperating stitch formin and feeding elements carried by the two movable frameworks, transverse webs disposed in each stationary chassis and each movable framework, rotary drive shafts for both the saidstitching elements, one each journaled'in the transverse webs of the stationary chassis, and endwise slideable shafts telescoped over, and keyed to, leach rotary drive shaft, each latter .Shdft having its journals disposed in the transverse webs of the associated movable framework and means operatively connected to both said moveable frameworks for causing them to shift towards and away from said vertical standard.

7. In a sewing machine, a base and a top portion, a vertical standard connecting the two portions, each portion comprising a stationary chassis and :a relatively movable framework associated therewith, cooperating stitch forming and feeding elements carried by the two movable frameworks, transverse webs disposed in each stationary chassis and each movable framework, rotary drive shafts for the said stitching elements, one each journaled in the transverse webs of the stationary chassis, an endwise slideable shaft telescoped over, and keyed to, each rotary drive shaft, each latter shaft having its journals disposed in the transverse webs of the associated movable framework, and means to impose an endwise movement upon said slideable shafts and the associated movable frameworks. 8. In a sewing machine, a base and a top por tion, a vertical standard connecting the two portions, each portion comprising a, stationary chassis and a relatively movable framework associated therewith, cooperating stitch forming and feeding elements carried by the two movable frameworks, transverse webs disposed in each stationary chassis and each movable framework, rotary drive shafts for the said stitching elements, one each journaled in the transverse webs of the stationary chassis, an endwise slideable shaft telescoped over, and keyed to, each rotary drive shaft, each latter shaft having its journals disposed in the transverse webs of the associated movable framework, each slideable shaft being provided with an external thread, and a movable member secured to each stationary chassis, said movable member being adapted to be brought into engagement with the external thread and, upon torque being applied to the rotary drive shafts, to impose an endwise movement upon the slideable shafts and their associated movable frameworks.

9. In a sewing machine, a base and a top portion, a vertical standard connecting the two portions, each portion comprising a stationary chassis and a relatively movable framework associated therewith, cooperating stitch forming and feeding elements carried by the two movable frameworks, transverse webs disposed in each stationarychassis and each movable framework, rotary drive shafts for the said stitching elements, one each journaledin the transverse webs of the stationary chassis, an endwise slideable shaft telescoped 7 gaging members secured to the stationary chassis and adapted to move on it at right angles to the sliding shafts and so as to bring the thread engaging member into engagement position, whereby upon torque being applied to the rotary drive shafts, an endwise movement is imparted to the slideable shafts and their associated movable frameworks.

10. A sewing machine constructed in accordance with claim 9, including a spindle disposed new in the carrier, .thethread engaging memberbeing rotatably maintained on said spindle.

11. A sewing machine constructed inaccord 12. In a sewing-machine, a base and a top pore tion, a vertical standard connecting the two. portions, each portioncomprising a stationary chas-- sis and a relatively movable framework associated therewith, cooperating stitch forming-and feeding elements carried by the two movable frame- I works, transverse webs disposed in each stationary chassis and each movable framework, rotary drive shafts for the said stitching elements, one each journaled in the transverse webs of the stationary chassis, an endwise slideable shaft telescoped over, and keyed to, each rotary drive shaftyeach latter shaft having its journals dis-.- posed in thetransverse webs of the associated. movable framework and having the cooperating stitching and feeding elements disposed at its forward end, means to impose an endwise movement upon the said sliding shafts and their associated movable. frameworks, and means to disengage the said stitching and feeding elements from, the sliding shafts during the said endwise move-v ment. I I I 13. In a sewing machine, a base and a top portion, a vertical standard connecting the two portions, each portion comprising astationary chassis and a relatively movable framework associated therewith, cooperating stitchforming and feed.- ing elements carried by the. two movable frameworks, transverse webs disposed in .each sta-..

tionary chassis and each movable framework, rotary drive shafts for the said stitching elements, one each journaled in the transverse webs of the stationary chassis, and endwise slideable shaft telescoped over, and keyedto, each rotary drive shaft, each latter shaft having its journals disposed in the transverse webs of the associated movable frame work and being provided with an external thread, thread engaging members, one; secured to each stationary-chassis, said members being normally retracted and being adapted, when projected, to engage the said external thread.

and, upon torque being applied to the rotary drive shafts, to impart an endwise movement; to the slideable shafts and their associated movable frameworks,- a rotatable actuating shaft, one for the top and one. forthe base portion of the machine, each actuating shaft having an outer end-;

wise slideable shaft telescoped over and keyed to it, and means,-keye d to each of the said actuating. shafts,.for projectingand retracting said thread engaging member.

14. In a sewing machine, a base and a top portion, a vertical. standard connecting the two pertions, each portion comprising a stationary chassis and a relatively movable framework associated therewith, cooperatin stitch forming and feeding elements carried by the two movable frameworks, transversewebs disposed in each stationary chassis and each movableframeworkj rotary drive shafts for the said stitching elements one each journaled in the transverse webs of the stationary chassis, an endwise slideable shaft telescoped over, and keyedto, each rotarydrive shaft,

each latter shaft having itsjournals disposed in the transverse Webs of therassociated movable framework and being provided with, an external th e r a ng n memb rs e s teward each stationary chassis, said member being normally retracted and bein adapted, when projected, to engage the said external thread and,

the top and one for the base portion of the ma-' chine, each actuating shaft having an outerendwise slideable shaft telescoped over and keyed to it, clutch means to disengage the said stitching and feeding elements from the slideable shafts,

and means, keyed to each of said actuating shafts,

for projecting and retracting said thread engaging engaging said clutch means.

15. In a sewing machine, a base and a top portion, a vertical standard connecting the two por tions, each portion comprising a stationary chassis and a relatively movable framework associated therewith, cooperating stitch forming and feeding elements carried by the two movable frameworks, transverse webs disposed in each stationary chassis and each movable framework, rotary drive shafts for the said stitching elements, one each journaled in the transverse webs of the stationary chassis, an endwise slideable shaft telescoped over, and keyed to, each rotary drive shaft, each latter shafthaving its journals disposed in the transverse webs of the associated movable framework and being provided with an external thread, thread engaging members, one secured to each stationary chassis, said members being normally retracted and being adapted, when projected, to engage the said external thread and, upon torque being applied to the rotary drive shafts, to impart an endwise movement to the slideable shafts and their associated movable frameworks, a rotatable actuating shaft, one for the top and one for the base portion of the machine, each actuating shaft havin an outer endwise slideable shaft telescoped over and keyed to it, clutch means to disengage the said stitching and feeding elements from the slideable shafts, a crank arm keyed to each actuating shaft, said thread engaging member having a wall adapted to be engaged by said crank, spring means se-' cured to the stationary chassi for action upon the thread engaging member in opposition to the crank arm, a clutch lever and a linkage connecting said lever to said actuating shaft, the ac-v tuating shaft being adapted, upon receiving a torsional movement, simultaneously to bring the thread engaging member into engagement position and to disengage the clutch means.

16 A sewing machine constructed in accordance with claim 9 and including lock blocks secured to the carrier of the thread ngaging member and lugs secured to the transverse webs of the movable frameworks, the lock blocks being adapted to latch behind the lugs during retraction of the thread engaging member whilst being disengaged upon its moving into engagement position.

17. In a sewing machine, a base and a top por tion, a vertical standard connecting the two portions, each portion comprising a stationarychassis and a relatively movable framework associated therewith, cooperating stitch forming and feeding elements carried by the two movable frameworks, transverse webs disposed in. each stationary chassis and each movable framework,

rotary drive shafts for the said stitching elements, one each journaled in the transeverse webs of the tationary chassis, an endwise slideable member and for simultaneously engaging and dis 1 shaft telescoped over, and, keyed to, each rotary drive shaft, each latter shaft having its journals disposed in the transverse webs of the associated movable framework and being provided with an external thread, thread engaging members, one

secured to each. stationary chassis, said members chine, each actuating shaft having an outer endwise slideable shaft telescoped over and keyed to it, and means, keyed to each of the said actuating shafts for projecting and retracting said thread engaging member, tripping means for looking at least one of said outer actuating shafts and for releasing it when the slideable shafts reach their extreme endwise position and means for returningv the actuating shafts to their original position after being released.

18. In a sewing machine, a base and a top portion, a vertical standard connecting the two portions, each portion comprising a stationary chassis and a relatively movable framework asso-' ciated therewith, cooperating stitch forming and feeding elements carried by the two movable frameworks, transverse webs disposed in each stationary chassis and each movable framework, rotary drive shafts for the said stitching elements, one each journaled in the transverse webs of the stationary chassis, an endwise slideable shaft telescoped over, and keyed to, each rotary drive shaft, each latter shaft having its journals disposed in the transverse webs of the associated movable framework and being provided with an external thread, thread engaging members, one

secured to each stationary chassis, said members being normally retracted and being adapted, when projected, to engage the said external thread and, upon torque being applied to the rotary drive shafts, to impart an endwise movement to the slideable shafts and their associated movable.

frameworks, a rotatable actuating shaft, one for the top and one for the base portion of the machine, each actuating shaft having an outer endwise slideable shaft telescoped over and keyed to it, clutch means to disengage the said stitching. and feeding elements from the slideable shafts, and means, keyed to each of said.actuating shafts, for projecting said thread engaging members and for simultaneously disengaging said clutch means, tripping means for looking at least one of said outer actuating shafts and for releasing it when the slideable shafts reach their extreme endwise position and means for returning the actuating shafts to their original position after being released.

19. A sewing machine constructed in accordance with claim 17 wherein the tripping means comprise locking means disposed on one of the actuating shafts, an arm fulcrumed on one of the stationary chassis, cooperating locking means carried at one end of said arm, a lengthwise movable rod carried by one of the stationary chassis, abutments disposed on the said rod, said abutments being adapted to be engaged by the movable framework at its extreme end positions and to impose a lengthwise rocking movement on the rod, swivel means secured to the rod for transmitting the movement of the rod to' said arm, the arm movement effecting the relative release of thelocking means.

20. A sewing machine constructed, in accord ance with claim 12, including an electric motor,

a' motion transmitting connection from said motor to the rotary drive shafts and individual switch means for starting said motor for expansioncontraction and stitching.

21. A sewing machine constructed in accordance with claim 13, including means for impos ing a torque upon said actuating shafts, an electric motor, a motion transmitting connection from said electric motor to the rotary drive shafts, a switch, each, for starting said electric motor for expansion-contraction and for stitching, the actuating means of the first named switch being coupled to the means imposing a torque on the actuating shafts.

22. A sewing machine constructed in accord ance with claim 13, including means for imposing a torque upon said actuating shafts, an elec- *-tric motor, a motion transmitting connection from said electric motor to the rotary drive shafts, a switch, each, for starting said electric motor for expansion-contraction and for stitching, the actuating means of the first named switch being coupled to the torque imposing means, and in eluding further means coupled to the torque imposing means to make the switch of the stitching mechanism inoperative during expansion-con- I traction.

23. A sewing machine constructed in accordance with claim 13, including a lever for starting the expansion-contraction operation, a spindle carrying the lever and rotatable by it, a connection between said lever spindle and the two actuating shafts, an electric motor, a motion transmitting the connection from said motor to the rotary drive shafts, a switch, each, for starting the motor for expansion-contraction and for stitching, means carried by said lever spindle for extending base, a shuttle movable supported adjacent one end of said base, a drive shaft movably supported adjacent the opposite end of said base, manually operable control means whereby said base may be extended to increase the distance between said drive shaft and shuttle and means for operatively coupling said drive shaft and shuttle.

25. A sewing machine including a horizontally extending base, a shuttle movably supported adjacent one end of said base, a drive shaft movably supported adjacent the opposite end of said base, means whereby said base may be extended to increase the distance between said drive shaft and shuttle, means for operatively coupling said I drive shaft and shuttle and means for connecting said base-extending means with said shaft to be operated thereby.

26. A sewing machine including a substantially horizontally extending supporting assembly, a needle bar mounted for reciprocation adjacent one end of said assembly, a driving shaft mounted adjacent the opposite end of said assembly, means for extending said assembly to increase the distance between said needle bar and shaft and manually operated control means for operatively connecting said shaft and bar.

27. A sewing machine including a substan tially horizontally extending supporting assembly, a needle bar mounted for reciprocation ad 7'5' jacent one end of said assembly, a driving shaft mounted adjacent the opposite end of said assembly, means for extending said assembly to increase the distance between said needle bar and shaft, means for operatively connecting said shaft and bar and manually operated control means for coupling said assembly-extending means with said shaft to cause the latter to operate the same.

28. A sewing machine including a horizontally extending base, a shuttle movably supported adjacent one end of said base, a supporting assembly extending substantially parallel with said base, a needle bar mounted for reciprocation adjacent one end of said assembly and at a point overlying said shuttle, a shaft disposed for rotation adjacent those ends of the assembly and base which are opposite the shuttle and needle bar, manually operated control means common to said assembly and base whereby they may be extended to increase the distance between the shuttle and needle bar and the shaft and means for operatively connecting said needle bar and shuttle with said shaft.

29. A sewing machine including a horizontally extending base, a shuttle movably supported adjacent one end of said base, a supporting assembly extending substantially arallel with said base, a needle bar mounted for reciprocation adjacent one end of said assembly and at a point overlying said shuttle, a shaft disposed for rotation adjacent those ends of the assembly and base which are opposite the shuttle and needle bar, means whereby said assembly and base may be extended to increase the distance between the shuttle and needle bar and the shaft, means for operatively connecting said needle bar and shuttle with said shaft and manually operated control means whereby said base and assembly-extending means may be connected to said shaft to be operated thereby.

SOLOMON ADLE-R.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS