US1253737A - Trimming mechanism for sewing-machines. - Google Patents

Description

A. H. SllvlI/IGNS. Tmmmm MECHANISM FOR SEWING MACHINES.

APPLICATION FILED FEB. 5. 1914.

Patented Jan. 15, 1918.

.a arianne @ALBERT H. SIMMONS, OF CHICAGO, ILLINOIS, ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OIF CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.`

rniiriviine iviiicHANisivi ron SEWING-MACHINES,

Specification of Letters Patent.

Patented Jan.. 15, 1913.

' Application filed February 5, 1914. Serial N o. 816,756.

To'all whom t may concern:

Be it known that I, ALBERT H. SIMMONS, a citizen of the United States, residing at Chicago, iii-the county of Cook, State oitl Illinois, have'invented certain new and useful Improvements in Trimming Mechanisms for Sewing-Machines, of which the following is a description, reference being had to theaccompanying drawing, and to the l0" V f The invention relates to new and useful figures of reference marked thereon.

improvements in trimming mechanisms for sewing'machines, and more particularly to a trimming mechanism wherein the trimingmechanism for trimming the edges of iabric, which edges are abutted and joined Abycioss-stitching. l Y

An object` of theinvention is to provide atrimming mechanism wherein the movable trimming l blade is positively reciprocated -back andi'orth, andis held in proper contact withits cooperating member.

A further obj ect of the invention is to projecting from thev trimmingpoint.

1 .In"thedrawings, which show by way of l illustration-one embodiment of the invention,

- Figure 1 is an enlarged perspective view, --showing the presser foot, the trimming mechanism and the forward end of the work support; Y 1 a I Fig. 2 is a perspective view, showing the presser foot, the trimming members and clamping devicestherefor, the parts being 'separated to show the structure; and

Fig. 3 is an enlargedv sectional view through the presser foot at the needle slot.

The'trimming mechanism `embodying my improvement is of the typewherein the trimming blades operate in a'horizontal plane in advance of cross-stitchmechanism, and relates particularly to the construction of ythe stationary knife and its l'supporting means, whereby a stationary trimming blade cooperating with a movable blade may be made of considerable length without unduly which tlie'curvedstationarv blade located in the recess of the `presser foot `may be aidjusted as it is ground and sharpened so as Qtral opening 26 which ts the boss 23. section is removed iromtlie blade, so 'as to to maintain proper coperative relation with the movable blade. This constructionof the stationary blade not only permits a relatively long blade to be used, but also provides a very firm support for the blade as it is housed in the recess in the presser foot and the entire length of the blade is supl ported.

Vso that the needlezigzags back and forth `across the line of feed `making a cross stitch. Aming members operate in substantially a horizontal plane'in advance of a cross-stitch The presser foot bar is shown at 5, its

supplemental bar at 6, and the presser foot shank at 7. Pivoted` to a forked bracket 8 `vertically adjustable on the extension 9 of 12` which Ais operated in tlieusual way (not shown).` The otherarm 13 of the rocking j lever carries the movable trimmer knife 14, Vheld by the set screw 15.

The adjustment of `the bracket 8 on the extension 9 through the setV screw landtongue and groove arrangement 17, enables the movable arm to be properly set with regard to the coperating stationary blade, and the adjustable plate 18 is set firmly against arm 13 when the knife is in position. The presser foot 19 is slotted at 20, and this slot extends from the forward end of the presser foot centrally thereof into the presser foot, and the side walls of theslot are tapered outwardly.

The work support `is provided with a V- shaped delector 21, which turns up the edges of the fabric when sections are to be trimmed and joined, or forms a fold in the 9 fabric when a section is to be cut from the same andthe edges afterward joined.

The needle 3 passes through a needle opening 22 formed in a cylindrical boss `carried by the presser foot 19. The slot 2O leads to the front face of the boss 23. The upper face of the presser foot is formed with an Vannular recess 24, the boss 23 forming thecentral wall of said recess. A stationary trimmer blade 25 `is formed so as to fit said s y annular recess 24. projecting from the trimming point, and in `In lother words, this stationary trimmer blade 25 is annular in shape, having a cenform ai cutting edge 28. This stationary blade is placed in the recess Q4 and is held therein by a clamping arm 29, which car` ries screws adapted to press Aagainst the blade, as clearly shown in the drawings.

This clamping arm is recessed as shown in Fig. 2 to allow proper' clearance for thedescent ofthe needlebar. A clamping screw 3l clamps the arm 29 to the presser foot, and causes the screws 30 to press against the blade tohold it `firmly in the recess W hen 'the blade 25 wears, it is removed and reground and shifted axially on the boss 23. The movable blade lllvis mounted yso as to reciprocate in a substantially horizontal plane, and the presser foot is recessed as at 33 to form a guideway for this movable blade. e

A bridgevplatevli spans they guideway 33 and is secured thereto `by suitable screws. This bridge plate has a forwardly projecting arm 35, which supports the blade at. a point adjacent the slot 20, that is, at a point adjacent the trimming line, and holds the blade in proper coperative relation `to the stationary trimming member 25.4

In the operation of my device, the fabric is fedI to the machine and thedelector 2l forms a fold in the fabric, so that as the fabric enters the slot in the presser-foot., it will be in substantially vertical position.

The trimmer blade trims off the portion of the fabric extending above theblade, after` which the trimmed edges are abutted and are joined bycross threads. The trimmed-off strip is deflected to one side of the stitching mechanism by another deflecting device (not shown). p

By increasinon or decreasing the fold formed in the fdl-bric, (that is, the lamountof fabric which is cut from; the piece,) tubular articles may be 'shaped and the trimmed edges joined. VVIt will also be understood that two separate sections may be fed to the machine, and the `defiector Q1 will raise the edges so they will be substantially vertical and in position for action by the trimming mechanism. y I 4 It is obvious that minor changes in the details of construction may be made, without departing from the spirit of the invention as set forth inthe appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is :v Y

1. A sewing machine including in combination, a presser foot having a slot in the forward end thereof leading into said presser foot, a needle, a trimming member movable across said slotin advance of the needle, a curved stationary trimming member carried by the presser foot and cooperating with lsaid movable member, saidstationary trimming'memberbeing shaped like a segment of an annulus ofmorc than 180 degrees and across said 'slot in advance of the needle, a

curved stationary trimming membercariried by the presser foot and coperating with said movable member, said stationary trimming member being of substantially the samecloss sectional larea throughout and. vcurvedlso as to substantially encircle thelneedle.

A" sewing machine including in combination, a presser foot having a slot intheV forward e-nd thereof .leading into said presser foot, a needle, a trimming member movable across s aid slot in advance of ythe Ineedle, a curved stationary trimming member carriedby the presser footandcoperating with said movable imeinber, said presser foot having arecess imits upper face, a central boss in .said` recess,.iand said sta tionarytrimming member .being curved to Iitsaid recess. v

l., A sewing machine including invrcombination, e Presseinfo@ havin `a slot in the Aforward end thereof leading into said presser foot, a needle, aA trimming-member movable -across said slot in advance ofthe.

needle, a curved` stationary trimming member carried bythe presser. footy coper- Yating with said movablejmember, Asaid presser foot having arecess in vits upper face, a central bossin saidl recess,` saidrsta-` tionarytrimming"member being curved to titsaid recess, and said central boss having a needle openingtherein through which the needle reci-procates.

A trimming mechanism vcomprising 'a movableiblade. andi alixed blade, said fixed blade being shaped like a segment of an annulus of more than, 180 degrees fand having one end theerofadapted to coperate .with

y the movable4 trimming blade.

6. A trimming mechanism for sewing machines including a movabletrirmning member, a Vsupport having an annular Arecess thereinV and a fixed trimmingblade, `said fixed blade being shaped like a segment of ,ann

annulus of more than: 1800and having` one end thereof adapted tocoperate with the movable trimming1-lblade and; means for clamping-'said fixed blade in` saidfrecess.

7. A trimming mechanism including in combination, a presser foot, a movable trimmer.bla demeans for moving said blade in substantially a horizontal plane, said presser foot having an annular-'recess in' its upper face andastationary blade cooperating with the movable blade, said stationary blade being shaped to 'fit said annular recess, and

lmeans for clamping said blade in said recess.' y i 8. Av trimming mechanism including in tral boss provided with a needle opening, a trimming blade shaped to fit said recess, and means for holding the blade in said recess, 15 said presser foot having a slot in its forward end extending to said boss.

In testimony whereof, l aiix my signature in the presence of two Witnesses.

ALBERT H. SlMMUNS.

Witnesses:

JAMES R. MOFFATT, A. B. CLOTHIER.

Copies ai this patent may he obtained for five cents each, by aldressing the Commissioner of Patents, Washington, D. C.

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