US2555525A - Device for hidden stitch hemming - Google Patents

Description

J 1951 B. ZALLEEL I 2,555,525 DEVICE FOR HIDDEN STITCH HEMMING Filed Nov. 22, 1948 5 Sheets-Sheet l JNVENTOR. BAE ZALLEEIL June 5, 1951 ZALLEEL 2,555,525

DEVICE FOR HIDDEN STITCH HEMMING Filed Nov. 22, 1948 3 Sheets-Sheet 2 FIG. 5 FIG. 6

'lllllllllllrlllll INVENTOR. BAE ZALLEEL mqgmmm A r TOR/V5) June 5, 1951 B, ZALLEEL 2,555,525

DEVICE FOR HIDDEN STITCH HEMMING Filed Nov. 22, 1948 I 3 Sheets-Sheet S FIG.H

BAE ZALLEEL BY (Z a/ail ATTORNEY INVENTOIL.

Patented June 5, 1951 DEVICE FOR HIDDEN STITCH HEMMING Bae Zalleel, Van Nuys, Calif.

Application November 22, 1948, Serial No. 61,371

4 Claims.

This invention relates to a device for hidden stitch hemming, and it has among its salient objects:

To provide an improved attachment for use with sewing machines as commonly used in homes;

To provide a simplified mechanism of the character referred to having means for automatically guiding the material being stitched with a minimum of manual skill and effort in using such attachment;

To provide improved means for causing the, needle to skip one or more stitches at a time, as may be desired.

In order to describe the invention more in detail, I have shown one practical embodiment thereof on the accompanying three sheets of drawings, in which:

Figure 1 is a perspective view of one practical embodiment of the invention ready for attachment to a sewing machine;

Figure 2 is a side view, showing one adjustment in light broken lines, and also indicating the needle holding foot of the sewing machine;

Figure 3 is a top plan view of the invention alone;

Figure 4 is a cross sectional view taken on the line A-A, Fig. 3;

Figure 5 is an enlarged sectional view through the foot bar attachment;

Figure 6 is a vertical sectional view through said foot bar attachment;

Figure 7 is a perspective view of a ratchet mechanism;

Figure 8 is a sectional view through said ratchet mechanism;

Figure 9 is an enlarged vertical sectional view through the skip stitch assembly;

Figure 10 is a sectional diagrammatic view to indicate the manner of the needle penetrating the fabric;

Figure 11 is a view similar to Fig. l, of a mod.- ified embodiment of the invention;

Figure 12 is a side view thereof;

Figure 13 is a plan view thereof; and

Figure 14 is a sectional view on line 13-43, Fig. 13.

Referring in detail to the drawings, a base plate II], has hingedly connected therewith at H, a guide plate l2 for a fold plate I3, slidable therein, and the end of which operates in a guide block or member l4. A bearing lug l5, on the fold plate [3, moves in an open slideway IS in said guide plate 12. A lug H on guide plate l2 holds a screw pin. l8, threaded. at its outer. end

as at Hi, to receive an adjustment nut 20, for adjusting the fold plate [3, in a manner which will be clear from the showing thereof. A spring 22 yieldingly presses the lug l5 and said fold plate I 3 forwardly into the channel 2| in the guide block l4, as seen in Figs. 1 and 2. This adjustment of 'saidfold plate I3 compensates for different thicknesses of material to [be sewed. Said fold plate l3 can thus be pulled rearwardly sufliciently to clear the channel 2| and to be raised in the manner indicated in light broken lines, Fig. 2. This facilitates the folding of the material to be sewed on the end of said fold plate [3 before placing it in the channel 2|. The

fold is thus guided to and held in said channel 2i in position to be sewed by the needle 24, as clearly indicated in Fig. 2, and for sewing a straight stitch line.

A mounting block 25 takes the place of the conventional foot lever and is mounted on the shaft 26 in place of said foot lever, said block having a slot or open channel as 2'! therein for this purpose. Another channel 3'! in said block fits over a worm 28, set in said block 25 as shown in Fig. 5, with its end 3| extended and provided with a knob 30 thereon and held in place by a pin 32. A vertical lug 33, fits into the channel 31, and is provided in its upper end with worm gear teeth to engage with said worm 28, as seen in Fig. 6, when said worm is turned by its knob. This adjustment is to insure the proper relation between guide block I 4 and the needle 24. A lock pin 34 is threaded at one end and inserted through said block 25, in the manner indicated in Fig. 6, said vertical lug 33 having a slot 35 therein to receive said lock pin 34, in the manner indicated, Figs. 5 and 6. By reference to Fig. 3, said lock pin and said worm can be seen in their relationship in said guide block 25. A knurled knob 55 on the end of said lock pin or screw 34, makes it easy to operate it withthe fingers.

An upstanding bracket 36 is mounted on the guide block I4, by means of screws 38, Fig. 9, to support the jump stitch assembly. A ratchet wheel 39 is mounted on a shaft 40 in said bracket and is held in place by means of an end screw 4|. The inner face of said ratchet wheel is provided with a corrugated ring formation 42, as shown, and serves to engage and move a push pin 43, to be moved against the edge of the fold plate l3. A neck portion 44 in said push pin 43, provides a limit stop for the set screw 45 extended into said neck portion, and prevents the pin from dropping out of the block I4, but it does not. interfere. with. its movement,

A ratchet body of U -shape, designated 46, holds a ratchet dog 41 therein, as shown, with a spring 48 operating thereon to move it toward the ratchet wheel 39, said ratchet body being pivotally mounted on a pivot pin 50, which serves as a bearing for the dog 41.

A forked arm is preferably bent to align with a needle holder 52, as indicated in Fig. 2, and held in place by a thumb screw 53, to be operated by said needle holder, as will be understood from Fig. 2.

In operation, the material to be sewed is folded around the end of the plate 13, as seen in Figs. 9 and 10, while in its raised position shown in Fig. 2 in light broken lines, and then moved to a horizontal position in the open channel 2| in Fig. 9, for holding and guiding said material in proper alignment with the needle for a true and uniform stitch line, thus minimizing the need for skilled hands to guide said material. The ratchet dog 4'? operates the ratchet wheel 39 as the arm 5! is moved up and down with the needle holding member. This action causes the corrugated surface on the inner side of said ratchet wheel to engage and force the pin 43 against the plate I3, thus forcing the fabrics edge clear of the needle at regular intervals, thus resulting in a longer spacing between stitches. Thus the ratchet wheel is intermittently turned as the needle holder operates up and down in the regular manner of sewing.

Referring to Figs. 11 and 12, the plate 54, is formed with a struck-up wing 56, instead of the lug l1, Fig. 1, and the guide plate 59 is provided with a struck-up wing 60, and the spring 22 on a :pin 51, through said wing portions, serves to give the resilient mounting for said guide plate 59, as will be clear from Figs. 11 and 12. The outer end of said pin 5'! is provided with annular groove and a lock ring 6| therein, to hold said pin, in a manner well known.

A modified form of block 25 is shown as 62 and is adaptable to the worm gear assembly before described. A guide plate 63, holds a graduated member 64, adjustably held by means of a lock screw 61, and constitutes a guage for setting the fold of the fabric before the stitching begins. The scale divisions 65 enables the operator to see the exact measure of the hem fold and to arrange it as desired. A handle feature 66 makes it convenient for a finger tip control or movement of said member 64. Extension 68 is provided with a slot 69 to receive a set screw on some makes of machines.

Thus I have provided a simple and practical mechanism for automatically moving material being sewed out of alinement with the needle to accomplish the skip stitch method referred to, said means being a'combination of ratchet wheel with a corrugated formation as an actuator for intermittently moving the material being sewed.

I do not limit the invention to the showing made for explanatory purposes, except as I may be limited by the hereto appended claims.

I claim:

1. In a sewing machine, the combination with the needle holding and operating member, a base plate open in its middle, a guide plate hingedly connected at one end with one end of said base plate, a fold plate slidably mounted in said guide plate, means for adjusting it relative to said guide plate, spring means yieldingly holding it in adjusted positions with its free end adapted to have fabric folded-around it, said foldplate overlying the open middle of said base plate, a guide block on said base plate and. having a channel on its side next to the end of said fold plate to receive said fold plate and the fabric folded around it, said guide block having an opening in its channel side, intersecting said channel, in the path of the needle, means for adjusting said guid block relative to the path of the needle, to compensate for the different thicknesses of material around the end of said fold plate, a ratchet wheel mounted on said guide block, with an operating dog bearing thereon for intermittently turning said ratchet wheel, said dog being'operatively conheated with the needle holder of said sewing machine, to be actuated thereby, a push member movably mounted in said guide block and movable into and out of engagement with the end of said. fold plate and the material folded around it, to push it out of the path of said needle; and means on said ratchet wheel in the form of cam elements to intermittently engage and move said one end with said base plate, afold plate slidable in said guide plate and'having its end free to have fabric folded around it, spring means yieldingly holding said fold plate in said guide plate, a guide block mounted on said base plate and having a channel in its side with a notch across the open side of said channel in the path of said needle, said channel being adapted to receive the free end of said fold plate and fabric folded around it, means for adjusting said guide block relative to the path of the needle, to compensate for the different thicknesses of material around the end of said fold plate, a ratchet wheel mounted on said guide block, an operating dog connected to be operated by the needle holder for intermittently turning said ratchet wheel, a push pin movably mounted in said guide block and movable into pushing engagement with the free end of said fold plate and the material folded around it, to push it and the folded material out of the path of the needle, and cam formations on the side of said ratchet wheel for intermittently engaging and moving said push pin to move said fold plate and said materialout of the path of said needle.

4. A claim as set forth in claim 3, having a flat member with graduations thereon, mounted near the edge of said fold plate for determining the extent of the fold of the fabric around the end of said fold plate.

BAE ZALLEEL.

REFERENCES CITED The following references are of record in the Number I Name Date 2,036,828- Rivers Apr. '7, 1936 V FOREIGN PATENTS Number Country Date 15,917 Great Britain July 3, 1914:

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