US1461040A - Buttonhole-sewing machine - Google Patents

Description

July 10, 1923.

A. E. LINDNER BUTTONHOLE SEWING MACHINE 1921 3 Sheets-Sheet l Filed April 2'7 July 10, 1923.

A. E. LINDNER BUTTONHOLE SEWING MACHINE Filed April 27. 1921 3 ShGGtS-Sheet 2 ummm@ July 10, 1923:

A. E. LINDNER BUTTONHOLE SEWING MACHI NE Filed April 2v. 1921 3 Simms-Sheet 5 BOTTOM CHM mam?- Patented July l0, 1923. l

LUNITED STATES PATENT OFFlCE,

ARTHUR LINDNER, OF BROOKLYN, NEVVYORK, ASSIGNOR TO THE L. AND H. SPECIAL MACHINE CO., INC., OF NEW vYORK, N. Y., A CORPORATION OF NEW YORK.

BUTTONHOLE-SEWING MACHINE.

Application filed April 27, 1921.

To all w 7mm t may concer/n.'

` Be it known that I, ARTHUR E. LINDNER, a

citizen of the Republic of Germany, and

residentv of the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Buttonhole-Sewing Machines, of which the following is a description.

` This invention relates to button-hole sewing machines and has for its primary object to provide a machine for this purpose Wherein the needle operatesin a single vertical position, together with means for shifting the material or goods in a horizontal planewithout turning or twisting the same so as to cause the line vof stitching to follow accurately the outline of thebutton-hole to secure the reinforcing cord along the edge thereof. ln carrying out my present invention, in one embodiment thereof, lfprovide a plate longitudinally shiftable vupon a. laterally movable plate andupon which the material is placed over a key-hole slot conforming in outline to the shape of the button-hole in the material, and cammeans for imparting the requisite Vmovement to lsaid plate and the material thereon during the stitching opervation'so as to ,cause the line of stitching to accurately 'follow theoutline of the buttonhole without necessitating a movement-of the material with respect vto the plate having the key-hole slot'therein,`and thereby permitting'the vertically reciprocating needle to remain in a constant operating'position.

In this manner I have succeeded in greatly simplifying the construction of such machines since the relatively vcomplicated mechanism heretofore employed for shifting the pointV of penetration of the needle Iso thatit follows the outline of the buttonhole isl dispensed with, and in lieu thereof, a comparatively simple meansisl employed for progressively! changing or shifting the position of the button-hole in the material with'respect to the line of movement of the needle.

With theabove andA other objects in view, the' invention consists in the improved form, construction' and relativearrangement of the several parts .i as will be hereinafterr more fully 4described, illustrated inI the accompanying drawings, and subsequently incorporated in'the subjoined claims.

"In the drawings wherein lhavedisclosed one desirable and practical embodiment of Serial No. 464,850.

the invention and in which similar reference characters designate corresponding parts throughout the several views:

Figure l is a perspective view illustrating a button-hole sewing machine wherein the needle and operating means therefor is shown in dotted lines, while the essential features of the present improvement are illustrated in full lines.

Figure 2 is aperspective view of the bed plate, the longitudinally movable plate being removed therefrom.

Figure 3 is a fragmentary perspective view of the means for transversely shifting y the bed plate and of the superposed longitudinally movable plate;

Figure 4 is a perspective view of the longitudinally shiftable plate;

Figure 5 isa detail vertical section illustrating the mounting of the transversely and longitudinally shiftable plates and the means for imparting a compound movement Ato the latter plate;

Figure 6 is a detail perspective .view of the motion transmitting means, certain of the parts being shown in dotted lines;

Figure 7 is a similar view of a fragment of the pivoted cam actuated arm for transversely shifting the plates;

Fig. 7a represents a detail of a part of the connecting mechanism between the work carryingslides and the disc cams for actuatin them. i

ligure Sis a diagrammatic .plan view illustrating the relation of the various portions of the actuating cams to dierent sections ofthe button-hole outline;

Figure 9 is a diagrammatic plan `view illustrating the several progressive stages of the stitchingioperation with relation to the outline of the button-hole;

Fig. 9EL represents a diagram in which is indicated the start of the sewing operation at the left hand side of the buttonhole.

Figure 10 is a fragmentary! plan view showing an adjustable,v type of cam, which may be employed;

Figure l1 is a fragmentary plan view showing another alternative form of'icam means, and

Figure 12 is a fragmentary perspective view of a portion of the material having a completed button-hole.

Referring in detail to the drawings, in Figure l thereof, I have illustrated in dotted lines the arm 5 within which is housed the operating means for the thread carrying needle 6. This arm is mounted at its rear end in the usual man1-ier upon the machine frame which includes the bedyplate 7. Be-

neath the forward end of this plate, loop forming mechanism of any preferred type is mounted, but since this loop forming mechanism constitutes no essential part ot the present improvement it will not be further referred to in detail.

Upon the rear end portion of the bed 7 within a recess thereof a transversely shittable plate 8 is mounted,- the upper surfaces of said bed and the plate being flush. This platev adjace-nt to its opposite sides has spaced guides 9 secured thereon to receive the longitudinal edges of a plate 10 which is superposed upon said plate to move in unison therewith transversely oi' the machine, and for longitudinal shifting movement with respect thereto.- The plate 10 is `provided with a longitudinally extending depressed spring tongue 11 in its forward central portion, the said tongue having a slot 12 therein, one end of which is circularly enlarged as at 13 so that the said slot is oi' key hole form.

A throat plate 1li is yieldingly held upon the plate 10 by means of the leat' spring 15 and has a depressed portion engaging upon the tongue 11,- said throat plate being'likewise provided with a key-hole slot- 16.

The rear end o't an arm 21 is pivotally mounted in the machine frame as at 22 and adjacent to its forward end a pin 23 is fixed in the upper edge of said arm and is loosely engagedv in an opening orl socket 2l provided in the block 25 which is iiXed to the lateral extension 26 on one edge of the plate 8;

A depending bracket 27 is secured to the outer side of the arm 21 and has an inwardly projecting lug 28 on its lower end upon which the roller 29 is mounted tor engagement with the peripheral face of a primary disk cam 30.

The top plate 10 is provided with a hole through which depends a fixed pin 17. The bottom plate 8 is provided with' a longitudinal slot 18. A shiitable block 2O is mounted between spaced guides 7 on the bed plate 7 below the plate 8 opposite said slot 18 thereof.' This block has a shifting movement longitudinally with respect to the plate 8 and is provided with a channel or groove 19 which is disposed at right angles tothe slot 18 in the bottom plate 8. The pin 17 fixed to the top plate 10 and projecting through the hole therein as aforesaid depends downward through the longitudinal slot 18 in the plate 8 and into the channel or groove 19 in the block 2O engaging both said slot and said channel as shown in Fig. 5. The slide block 20 is provided with a dependant boss 31 which carries a roller 32.

A contractile` spiral spring 3i is connected at one end to said boss and at the other end to the bed. This spring tends to hold the roller 32 in engagement with the peripheral face oi a secondary disk cam 33' superposed upon or in fixed relation with the disk cam 30 and rotating as a unit therewith. These cams are iiXed upon a common axis and any desired operating means may be provided therefor, such for instance as the pawl and ratchet mechanism indicated at 35 in Fig. 8 of the drawings.

To the forward endI or' the arm 21 one end of a coil spring 36 is attached, the other end of said spring being connected to al suitable part et the bed plate 7. This spring operates to at all times hold the roller 29 in engagement with the peripheral tace of the primary disk cam 30. It will be apparent from this description that the cam 30 operates to impart a. unitary lateral shifting movement to the Aplate 8 and the plate- 10 with respect to the bed 7 of the` machine frame, while the cam 33 aetuates the slide block 2O and this block through the medium of the pin 17 effects a longitudinal shifting movement oithe superposed plate 10 upon the plate 8V.

Referring now to Figure 8 oi` the drawings, A indicates in out-line the form of the button-hole which is out in the material, having a circularly enlarged end. B corresponding to the form of they key-hole slots y12 and 16. The button-hole in the material is, however, somewhat smaller than the dimensions ofthe slots 12 and 16 so that the needle 6, in passing through they latter slots will penetrate the materia-l at the edge oi the button-hole A.` The bottom cam 30V is provided upon its peripheral face with a cam surface 37 to effect a lateral movement of the material with respect to the line 0i movement ot the needle for a distance corresponding to the width of the button-hole atA its narrower end. Another portion 'of the peripheral face of the cam is Vinterrupted or provided with a multiplicity of cam projections 38, which effect a plurality of sho-rt lateral 'shiiting movements of the material so as to produce a zig zagrstitch extending along onestraight side edge of the button-hole. Another part of the face of this cam indicated at 39 is comparatively continuous or uninterrupted andl produces the necessary lateral movement of the material with respect to the needle so that the line of stitching is carried around the enlarged curved end B` of the button-hole. The remainderoi'` the peripheral faceV of this cam is provided with a plurality oninterruptions or projections 40 corresponding to the cam portions 38 and which producera zig zag stitch alongthe opposite straight side edge of the lza'itton-hole,v j

The other of the 'cams 33 el'ects the neeessary longitudinal movements of the material with respect to the line of movement of the 1 needle and isprovided with continuous cam surface portions 4l` and 42 respectively to produce a longitudinal movement of the material corresponding to the opposite straight side edges of the buttonhole. Between these cam surfaces 4l and 42 the peripheral face of the cam has a multiplicityof cam projections 43 and 44 respectively, the projections 43 causing a number of short longitudinal movements around the yenlarged end B of the button-hole to thereby produce a zig zag stitch while the projections 44 effect the longitudinal movements across the opposite or narrower end of the button-hole.

In Figure 8 of the drawings I have indicatedby arrows leading from the buttonhole diagrams thevarious sections'thereof tol which the different operations of the two cams correspond in producing the requisite lateral and longitudinal movements of the i simultaneously. f

In Figure 9 I have shown diagrammatically the several progressive stages of the operation and have indicated the various altered positions of the button-hole -in the material withrespect to the vertical. line of operationof the needle which, at all times, remains constant. The point of penetration of the needle through the material is shown in this view by the vertical and horizontal intersecting dot and dash lines. I have also herein indicated the re-inforcing cord which is laid around the edge of the button-hole and over which the stitches are applied. The means for positioning this reinforcing cord as the sewing operation progresses does not constitute an essential feature of my present invention and need not, therefore, be herein disclosed. It will be observed that the zig zag stitches around the enlarged end B of the button-hole are accurately positioned in radial alignment with the center thereof. The completed buttonhole will, therefore, be very neat in appearance. By providing the means for imparting the combined movement to the material automatically and with respect to the reciprocating needle it is not necessary to turn or twist the material in stitching around the circular end B of the button-hole.

In Figure 9 of the drawings I have indicated the start of the sewing operation at the right hand side of the button hole at its narrower end and then proceeding progressively therefrom longitudinally and around the enlarged end of the button-hole, and then in a reverse longitudinal direction along the left hand side of the button hole.

However, as shown in Figure 9 I preferably start the sewing operation at the left hand side and at the lower end of the button hole so that the operation continues in a reverse direction to that indicated in Figure 9.

After the sew-ing operation has been completed, the threadis cut or severed in the usual manner. This cutting mechanism is located beneath the base plate 7 of the machine, but since it likewise constitutes no essential part of my' present invention, further reference thereto is unnecessary.

In Figure IO of the drawings, I have shown a slightly modified form of the operating cams wherein means is provided for adjusting the various cam portions. To this end, the body of the cam is provided at its periphery with a plurality of radially adjustable lugs said lugs being secured by means of screws 46, each lug having a slot 47 permitting of the shifting movement of thelug with respect to the holding screw.

By adjusting these cam lugs 45, the extent of lateral and longitudinal movement of the plate upon which the material is positioned may be varied accordingly as may be required owing to the particular shape and size 0f the vbutton-hole. Such adjusting means also enablesme to compensato for such wear as may occur and to thereby secure, at all times, a high degree of accuracy in operation.

In Figure Il I have shown still another modified form of the cam means wherein a single cam disc is employed having a cam track 48 in its upper surface to receive the cam roller 32-on the slide block 20 and also provided with a cam track 49 on its lower surface to receive the roller 29 on the pivoted arm 21.

In Figure l2 I have shown a button-hole as completed by means of the present invention and it will be observed that the stitches are very regularly applied in close relation t0 each other so that they will properly confine or secure the reinforcing cord in place around the edge of the button-hole. A particular feature of my invention resides in the regular application of the stitches across the narrow end of the button-hole at the completion of the sewing operation so that they are not piled upon each other as would be the case if the point of penetration were merely shifted longitudinally to opposite sides of the reinforcing cord.

From the foregoing description, considered 1n connection with the accompanying drawings, the construction and manner of operation of my improved button-hole sewing machine will be fully understood. The mechanism which I provide for producing a gyratory, longitudinaland lateral movement of the material in a horizontal plane with respect to the point of penetration of the needle, is relatively simple in its construction7 not liable to get out of order and is highly accurate and reliable in practical operation.

By means oil2 suoli a mechanism the machine as a whole can be manufactured at less cost than other machines ot that type wherein means is provided for moving the needle progressively around the edge of the button-hole.

While .l have herein shown and described a preferred and satisfactory embodiment of my invention, it is nevertheless to be understood that the machine is susceptible 0f many modifications in the form, proportion and arrangement of its several parts, and I therefore reserve the privilege of adopting all such legitimate changes as may be fairly embodied within the spirit and scope of the invention as claimed.

I claim:

l. In a machine for sewing around the edges ot button-holes of key hole shape, in combination with a needle mounted to reciprocate in a constant vertical position, superposed plates? means tor holding` the material upon the uppermost plate against movement with respect theretov` means for shitting said plates laterally as a unit and additional means operating simultaneously with the tirst named means to impart a longitudinal shifting movement to the uppermost plate with respect to the lower plate and thereby vary the position ot the buttonhole in the material with respect to the line of movement of the needle to progressively form a line of stitching around the edge of the button-hole with the individual stitches extending substantially at right angles thereto; said laterally and longitudinally shifting means comprising disk cams in iXed relation one above the other, a spring controlled pivoted arm provided with a dependent bracket carrying a roller engaging the periphery ot" the primary disk cam, a bed supf ported slide block provided with a dependant boss engaging the periphery of the secondary disk cam and a pin dependant from said top plate and engaging a groove in the bottom plate and a channel in said bloei; disposed at right angles to said groove, and a spring` for; holding said boss in contact with said secondary cam.

2. ln a buttonhole sewing machine, the combination ot a laterally shiftable bottom plate having a longitudinal slot, a longitudinally shii'table top plate mounted on said bottom plate and provided with a dependant pin engaging said slot, a bed supported slide block having a groove disposed at right angles to the slot of said bottom plate, said pin extending downward and engaging said Igroove. said slide block having a dependant boss, a laterally swinging arm provided with means engaging said laterally shiftable plate, snperposed disk cams in fixed relation to each otherj means on said boss and said arm for engaging the peripheries of said dish cams respectively and actuating means lor said cams.

In testimony that I. claim the foregoing as my invent-ion, I- have signed my name hereunder. -1

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