US1884271A

US1884271A - Folder for sewing machines

Info

Publication number: US1884271A
Application number: US338393A
Authority: US
Inventors: Rudolph J Sailer
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1929-02-08
Filing date: 1929-02-08
Publication date: 1932-10-25
Anticipated expiration: 1949-10-25

Description

Oct. 25, 1932.

Filed Feb. 8, 1929 .2 Sheets-Sheet g-nvcnfot ocL 25, 1932. R J, SMLER 1,884,271

FOLDER FOR SEWING MACHINES Filed Feb. 8, 1929 2 Sheets-Sheet 2 WWW Patented Oct. 25, 1932 UNITED. srATE-s- PATENT oFFicE- RUDOLPH J. SAILER, GE ELIZABETH, JERSEY, ASSIGNOB TO THE SINGER MANU- FACTURING COMPANY; OF" ELIZABETH, NEW JERSEY, ,.A (JOIRCPOIRiA'lIOfN OF NEW 7;

JERSEY FOLDER FORE SEWING MACHINES Applicationifi'led February. 8, 1929. Serial No. 338,393.

This invention relates to improvements in folders for sewing machines and more particularly to hem-folders of. the type having folder-sections which are separable to prov 5 vide for the completion of endless hemsin cir cular articles of various kinds.

An objectof the present invention is to provide a hem-folder of this-type with means for accommodating the passage through the folder of work having heavycross-seams and other lumpy portions. Anotherobject'of the invention is to provide for a more convenient manipulation of the work, after the foldersections are separated, to complete an endless 3 hem. Other and more specific objects of the invention will be apparent from the following description and claims.

In a preferred embodiment of the invention, the folder-sections are supported by a l base-plate which is-pivotally mounted upon a carrier-bracket for substantially horizontal swingingmovement, the carrier-bracket? being secured upon a cylinder work-arm ofa H sewing machine. The outer folder-section, which has the usual concave wall terminating in an overhanging flange, is secured upon the base-plate for adjustment transversely of the line ofseam formation. Adapted to, abut against the lower edge of said concave wall is I a movable or inner folder-section having a concave wall facing that of the fixed folder.- section and disposed below the overhanging flange of the latter. Mounted upon the base-plate, for movement in a direction substantially crosswise of the line of scam formation, is a sliding carrier-block carrying a: supporting-plate upon which the inn-er folder-section is mounted to yield against the action of a suitable spring A and relativelyto the slide-blocln This supporting means for'the inner folder-section provides for the passage through the folder of heavy cross-seams and other lumpy .portions ofthe work.

Pivot-ally mounted upon the slide-block is lever, adjacentits fulcrum, is a spring which not only acts upon the latch-lever to swing it into latching position, but also functions to retract thev slide-block to carry the inner folder-section away from the fixed section upon release of the latch-lever. By thus bodily shifting the inner folder-section away from the outer fiXed section, ample space is provided for conveniently manipulating the work to finish the hemming operation.

Secured upon the slide-block to overliethe latch-lever is awork-supporting apron which also overlies the inner folder-section and extendsinto the line of seam formation, whereby said apron assists in guidingthe work in the hem-folding operation. This apron is, 3

of course, retractible with the slide-block to open the hem-cavity. The slide-block has suitable connections with a knee-shift or treadle, whereby the retracted slide-block may be conveniently returned tobring the inner folder-section into its operative position.

In the accompanying drawings, Fig. 1 is afront side view in-elevation of a portion of a cylinder-bed sewing machine and of the present improved hemming attachment applied thereto. Fig. 2 is a top plan view of the free end portion of the sewing machine work-arm and the hemming attachment, withthe worksupporting apron partly cut away. Fig.3

is a sectional view substantially on the line 3-3 of Fig. 2. Fig. 4c is a bottom plan view of the attachment. Fig. 5 is a detail view, in bottom plan, of the inner folder-section and its support Fig.6 is a sectional view substantially on the line 66 of Fig. 1. Fig. 7 is a sectional view substantially on the line 7-7 of Fig. 1. Fig.8 comprises perspective views of the separated parts of the inner folder-section.

Referring to the drawings, the hemming attachment is shown as applied to a sewing machine having a cylinder work-arm 1, provided with a removable end-cap 2 and a throat-plate 3. Overhanging the work-arm is a bracket-arm terminating in a head 4, in which is suitably journaled a vertically reciprocatory needle-bar 5, carrying a needle 6. Also ournaled in the head 4 is a presser-bar 7 to which is suitably secured a presser-foot 8 opposed to a feeding mechanism (not shown) of any well known t'ype,-providedv in the work-arm to advance the work across said arm.

The hemming-attachment comprises an angular supporting bracket 9, secured by screws, as 10, upon the worlnarm 1 so as to be ad justable in a direction crosswise of the line of seam-formation. Hingedly secured upon the bracket 9, by means of a pivot screw 11 and friction-washer 12, is a heminer carrier plate 13 capable of being swung horizontally to remove the h eininer from its operative position. In order to secure the hemmer in its operative position, the carrier-plate 13 is apertured to fixedly receive a hollow post 14 in which is slidably disposed a plunger-type latch-pin 15 adapted to enter an aperture 16 provided in the throat-plate 3. The latchpin 15 is yieldingly depressed by a spring 17 to an'extent limited by the engagement of the head 18 of said latch-pin with. the upper end of the post 14.

Secured upon the carrier-plate 13, by screws as 19 so as to be adjustable crosswise of the line of seam-formation, is a hemmer base-plate 20. Adjustably fixed upon the base-plate 20, by screws as 21, is the shank 22 of a primary or outer folder-section 23 of the heinmer. This primary folder-section has a substantially straight edge 24 directly overlying the base-plate and disposed substantially parallel with the line of seam-formation, said edge 24 being in the present case slightly to the right of the seam-line. The primary folder-section rises from said edge 24 in a curved path to form a concave guiding wall 25 terminating in a flange 26, overhanging the wall 25 and crossing the seam-line. The concave wall 25 converges from an outwardly flaring work-receiving end, in advance of the base-plate, toward the delivery end thereof and merges into an edge-guiding finger 27 eX- tending adjacent the presser-foot 8 to a point substantially abreast of the needle 6.

Adapted to abut against th edge 24 of the prin folder-section is a straight edge 28 of a secondary or inner folder-section 29 having a concave wall 30 which constitutes, in effect, a continuation of the wall 25 to form therewith a folding scroll. The concave wall 30 terminates in an overhangin lip 31 disposed below and spaced from the flange 26, said lip 31 in the abutting position of the

edges

24 and 28 of the folder-sections extending across the seam line in a direction toward but spaced from the wall 25.

The inner folder-section 29 has a laterally extending shank 32 slidably disposed in a guideway 33 provided in a suitably channeled guide-block 34. The guide-block 34 is secured by screws, as 35, to the under side of a shiftable supporting-plate 36 which is fastened by screws, as 37 and 38 upon a ribbed carrier-block 39. The carrier-block 39 is slidingly disposed in a guideway pro .vided by. spaced and suitably

recessed guideblocks

40 and 41 secured by screws, as 42 and 43, upon the base-plate 20.

Upon the side of the guide-block 34 opposite to that occupied by the inner foldersection 29, the shank 32 of said folder-section carries a transverse abutment flange 44. Se cured upon the under side of the supportingplate 36, by means of a screw 47, is a wirespring 48 of which one end bears upon the flange 44 and acts to yieldingly urge the inner folder-section 29 toward the outer foldersection 23. The other end of the spring 48 bears against the shouldered end of the slide-block 39. This yielding feature of the inner folder-section 29 provides for the passage of bulky cross-seams through the hemmer.

Extending laterally from the outer end of the supporting-plate 36 is an apertured ear 49 upon which a latch-lever 50 is fulcrumed by means of the supporting-plate securing screw 38. The latch-lever 50 extends in a direction substantially crosswise of the line of seam-formation and at its free end, i. e., at its end nearest the folding scrolls, said latch-lever is provided with a forwardly extending neck 51, terminating in a tripping lip '52 disposed in advance of the folder-sections and crossing the line of seam-formation. Between it-s ends and on the front edge thereof. the latch-lever 50 is provided with a shouldered latching notch 53, which in the closed position of the folding scrolls is disposed to receive a fixed stud-pin 54, rising from the guide-block 41.

Secured upon the latch-lever 50 adjacent its fulcrum, is a plate having a depending ear 56. Bearing yieldingly against the car 56 is one end of a coiled spring 57 housed within a rectangular casing 58 secured by screws, as 59, upon the base-plate 20. In order to limit the movement of the slide-block 39 and the parts carried thereby in a direction away from the fixed folder-section 23. said slide-block carries a depending stop-pin 60 which engages one end of a slot 61 in the baseplate 20, through which slot the stop-pin 60 extends.

Suitably-secured upon the under side of the base-plate are'spaced guide-blocks, as 62 1and 63, which afford a guide'way fora slide-bar 64, having at one end a depending ear 65 adapted to engage the guide-block 63' and at its other end a shoulder 66, positioned to engage the protruding end of the stop-pin 60. The slide bar is yieldingly urged in a direction to cause its depending ear to engage the guide-block 63 by a coiled spring 67of which onejend'is secured uponthe slidebar 64 and its other end upon the guide-block The depending ear 65'of the slide-bar is "also engagable by the free end of one arm 68 of a bell-crank lever, fulcrumed by means of a pivotscrew 69upona fixed arm 70 depending from the supporting-bracket 9. The

other arm 71 ofsaid bell-crank lever is connected by a chain 72 or the like with a suitable treadle or knee-shift (not shown) andis also connected by means of a coiled spring 73 with the supporting-bracket 9. The spring 73 obviously functions to hold the arm 68 of the bell-crank leverina positionpermitting the spring 67 to return the slide-bar'64 into the position wherein-the slide-barear 65 engages the guide-block 63. I

Inorder to properly support the body material of which'the margin is to be hemmed, there is detachably', secured upon the supporting-plate 36, by me'ansiof screws, as. 74,

a covering-plate or work-supporting apron stud-pin 54. The necessary forward swinging movement about its fulcrumof the latchlever into stud-pin engaging position s effected by the spring 57 which bears upon the depending ear 56of the latch-lever with an increasing pressure as the slide-block 39 is shifted inwardly by the slide-bar 64, under the action ofthe treadle-operated

lever

68,71. Under normal hem-folding conditions and in the'latched position of the latch-lever 50, the edge 28 of the innerfolder-section 29 is urged by the spring 48 into abutting relation with the edge 24 of the outer'folder-section 28.

However, when lumpy portions of the work,

such as cross-seams, pass through the iemmer, the inner folder-section is free to yield bodily When completing the hemming of endless work, the initially stitched port-ion thereof engages the lip- 52 of the latch-lever 50 and laterally in the latched position of the lever under the continued feeding of'the work carries along, the lip 52 in the direction of the line of seam formation, thereby swinging the latch-lever upon its fulcrum until the shouldered notch 53 of the latch-lever is disengaged from the stud-pin 54. The latch-lever, with its lip 52, therefore constitutes a work-controlled release element for the shiftable folder-section. Immediately upon the release of the latch lever from the pin 54, the spring .7

57 is free to retract said latch-leven'thereby 7 also retractin the coverin late 7 5 and the r: a: P

inner folder-section 29. The stitching operation may now be completed with the. fixed folder-section constituting the work-guide. By shifting the inner folder-section bodily away from the outer folder-section, the work may be conveniently manipulated by an operator to complete the hemming operation.

Having thus set forth the nature of the inventi'on,what I claim herein is: V

1. A sewing machine having stitch-form.-v ing mechanism, in combination with a fabric folding device having separable sections together forming a scroll for folding a workmargin, supporting means for one of the folder-sections permitting it to yield laterally in a direction away from the other section during the passage of the work through the folding device,and a spring acting automatically during the stitching of endless seams for effecting separation of the folder-sections to provide for the completion of said seams.

.' 2. A sewing machine having stitch-formposed in advance of said stitch-forming mechanism, supporting means for one ofthe folder-sections permitting said section to yield laterally in a direction away from the other section during the passage of the work through the folding device, a work-controlled release element, and means rendered operative upon the operationof said release element for effecting separation of the folder-sections to provide for the completion of endless seams.

3. A sewing machine having stitch-forming mechanism, in combination with a fabricfolding device having separable sections disposed in advance of said stitch-forming mechanism, supportingmeans for one of the foldersections permitting said section to yield laterally in a direction away from the other section during the passage of the work through the folding device, and meausautomatically brought into effective action during the stitching of endless seams for laterally shifting the yieldable folder-section away from the othersection in a direction substantially transverse to the line of seam formation.

4. A sewing machine having stitch-form ,ing mechanism, in combination with a folder including an outer section and an innersection cooperating therewith to hem-fold the margin of a body material, supporting means lng mechanism, in combination with a fabricfoldlngdevlce having separable sections disfor the inner folder-section permitting it to yield laterallyin a direction away from the other section during thepassage of the work through the folder, a work-controlled release element, and means rendered operative upon operation of said release element for shifting the inner folder-section away from the outer section to provide for the completion of endless seams. 5. A folder for. sewing machines having separable sections together defining a hemfolding ca *ity, means including a work-controlled release element for releasably latching said folder-sections in hem-folding position, and supporting means for one of the folder-sections permitting it to yield laterally away from the other section in the latched position of said folder-sections.

6. A folder for sewing machines having a fixed-section and a movable section together defining a hem-folding cavity, shiftable supporting means for the movable folder-section, means for releasably latching said supporting means in the hem-folding position of the movable folder-section, a work-supporting apron rigid with said supporting means overlyingthe latching means and extending into the hem-folding cavity, supporting means for the movable folder-secti on permitting it to yield laterally with respect'to the fixed section and said apron during the passage of the work through the folder, and a latch-tripping lip engageable by the initially stitched portion of an endless seam to permit withdrawal of the movable folder-section and said apron from the fixed folder-section.

7, A hem-folder for sewing machines, including an outer section having a concave guiding-wall and an inner section having a concave guiding-wall facing the concave wall of the outer section, means for latching said folder-sections in hem-folding position, and a spring for separating the concave walls of said folder-sections upon release of said latching means.

8. The combination with stitch-forming mechanism, of a hem-folder including an outer section having a concave guiding-wall and an inner section having a concave guiding-wall facing the concave wall of the outer section, means for latching said folder-sections in hem-folding position, a latch-tripping lip located in the line of seam formation, and a spring for separating the concave walls of said folder-sections upon release of said latching means.

9. The combination with stitch-forming mechanism, of a hem-folder including an outer fixed section having a concave guidingwall and an inner movable section having a concave guiding-wall facing the concave wall of the outer section, means for latching the movable folder-section in its operative position, a latch-tripping lip located in the line of seam formation, automatically acting means for shifting the movable folder-section away from the, fixed section upon release of said latching means, and treadle-connections for returningthe movable folder-section into its operative position. 7

10. A folder forsewing machines having inner and outer sections together defining a hem-folding cavity, a work-supporting apron overlying the inner folder-section and extending into the line of seam-formation, supporting means for one of the folder-sections permitting it to yield laterally during the passage of work through the folder, and means for shifting said work-supporting apron out of the lineof seam-formation to provide for the completion of endless hems.

11. A folder for sewing machines having separable sections together defining a hemfolding cavity, supporting means for one of the folder-sections shiftable in a direction substantially crosswise of the direction of passage of work through the folder, a pivo- -folding cavity, supporting means for one of the folder-sections shiftable in a direction substantially crosswise of the direction of passage of work through the folder, a pivotally mounted'latch-lever extending forwardly beyond the work-receiving end of the folder and terminating, in a tripping lip disposed in the line of seam-formation, and means cooperating with said latch-lever for releasably securing said folder-sections in operative position.

13. A sewing machine having stitch-forming mechanism, in combination with a folder having an outer section and an inner section cooperating therewith to hem-fold the margin of a body material, a carrier-block shiftable in a direction substantially crosswise of the line of seam-formation, supporting means for the inner folder-section permitting it to yield laterally in a stationary position of the carrier-block, means for releasably' latching the carrier-block in the operative position of the inner folder-section, latchtripping means extending into the line of seam-formation, and means for shifting the carrier-block and the inner folder-section upon release of said latching means.

14. The combination with the stitch-forming mechanism of a sewing machine, of a hem-folder disposed in advance of said stitch-forming mechanism comprising a baseplate, an outer folder-section secured upon said base-plate, a shiftable carrier-block mounted upon said base-plate for movements substantially crosswise of the line of seamformation, an inner folder-section supported for lateral movements with res ect to and" with said carrier-block, means or latching said carrier-block in the operative position of the inner folder-section, a work-supporting apron sustained by said carrier-block, a spring for shifting said carrier-block in one direction upon release of its latching means, a slide-bar mounted upon said base-plate engageable with said carrier-block, treadle-operated means engageable with said slide-bar for returning the carrier-block into latched position, and supporting means for said baseplate permitting the swinging of said folder 35 from its operative position.

In testimony whereof, I have signed my name to this specification.

RUDOLPH J. SAILER.