US2426506A - Feed reverse and stitch regulating attachment for sewing machines - Google Patents

Description

v Aug. 26, 1947. M. lNGWER 2,426,506

FEED REVERSE AND STITCH REGULATING ATTACHMENT FOR SEWING MACHINES Filed Feb. 16, 1945 IN V EN TOR. Wax Man 5? Patented Aug. 26, 1947 UNITED STATES PATENT OFFICE Max IngWer, New York, N. Y., assignor to'Con- .solidated Sewing Machine & Supply 00., Inc.,

New York, N. Y., a corporation of New York Application February 16, 1945, Serial No. 578,182

2 Claims.

The inver'ltio'n here disclosed relates to stitch regulation and reverse feed of sewing machines.

Objects of the invention are to provide means in the nature of an attachment or accessory by which an ordinary, non-reversin sewing machine can be quickly and easily converted to a reverse feed machine and to provide desired stitch regulation in both directions.

Special objects are to enable such a conversion and addition without disturbing, impairing or changing any of the other parts or altering the proper operating characteristics of the machine.

Further objects are to provide anattachment of the nature indicated which will make use, so far aspossible, of the conventional portions of the machine and require simply the replacement'and addition of but few and relatively inexpensive parts.

Other objects are to'provide mechanism of the character indicated which will lainly show at alltimes just how the machine is set, as to length or number of stitches and direction of feed.

Other desirable objects and the novel features by which the purposes of the invention are attained will appear or are set forth in the course of the following specification.

The drawing accompanying and forming part of the specification illustrates present practical embodiments of the invention. Structure, however, may be modified and changed as regards the present illustration, all Within the true intent and broad scope of theinve'ntion as'hereinafter clefined and claimed,

Fig. 1 in the drawing is a broken front view of a sewing machine of conventional design having the invention applied thereto;

Fig. 2 is a broken end and part sectional view as on substantially the plane of line 2-2 of Fig.

Fig. 3 is a Vertical sectional View as on substantially the plane of line 33 of Fig. 1;

Fig. 4 is a broken sectional view as on substantially the plane of line 44 of Fig. 3;

Fig. 5 is a broken sectional detail of a modification.

In the several views the head portion of a sewing machine of more or less standard and conventional design is illustrated embodyin a hollow column or standard 1 rising from a bed plate 8 and carrying the overhanging arm 9 in which the main shaft 10 is journalled.

Th rock shaft which actuates the feed mechanism is shown at H, Fig. 3, having a rock arm l2 which is actuated from an upright link l3 disposed within the hollow column. "Osbillati'ng movements are imparted to the upper end of this link by cam on the shaft l 8 e'ngage'd'by a yoke 55 on the upper end of the link. Near its upper end the link carries a roller It engaged-in a groove in the face of a guide block or shoe. The inclination of :this guide groove determine'sthe vertical 'reciprocatory stroke of the link and hence the extent of feed movement imparte'd'to' the rock shaft I I.

In the more or less conventional type of domestic sewing machine the shoe for determining the up and down stroke of the feedmechani's'm actuating link l3 iss'crewe'd. fast on the inner end of a stud pivotally engaged inabearinghole ll, Fig. 4, in the side'or end wall of the tubular column. Also, in the conventional machine the guide shoe has a dependent "leverage extension or arm engaged and held between the spaced shoulders i8, Fig. 3, of a regulating screw "IQ-extending in through a screw holeZiJ in the front'of the hollow column.

Under the'present invention conversion to'reverse feed and stitch regulation 'is accomplished by removing the screw stud ordinarily journaled in the bearing hole 1 i, Fig. 4, taking'out-the regular shoe supported on the inner end of that screw stud and replacing these parts with a special *headed stud 2l,-Fig. l, which will turn in the passage ll and with a plain grooved shoe 22'screwed fast at 23 on the'inner end-of-the rotatably supported stud 2 l The substitute, rotatably adjustable stud 2! has an elongated operating head 24 atthe outer end of the same, providing a means for connection of ascrew rod Eiforming alever for positively turning the stud and the shoe fixedly mounted on the inner end of the same.

The adjustinglever 25'is shown'as projecting forwardly at the front of the machine where it can be easily reached by the operator, and as adapted to be secured in adjusted relation by a clamp nut 26 engageable with a plate or segment 21.

The part last mentioned is shown in Figs. 1 and 4 as slotted at 28 for passage of the adjusting lever 25 and as equipped with indications such as 29 which, in association with the lever, will show the length of stitch and the direction of feed for which the machine is set.

A further special feature of the invention is that the dial or index plate 21 is equipped with backwardly bent ears or flanges 30 for positioning it over the boss 3| usually present on the front of the column about the screw passage 29 and with a central opening 32 for passage of the regulator screw I9. This enables the regulator screw, to be replaced in the screw passage, over the perforated base portion of the dial and turned all the way in as in Figs. 2 and 3, to firmly and rigidly secure the dial in proper position for its cooperation with the adjusting lever 25. When thus turned all the way in and used as a clamp screw for securing the dial plate, the inner end of the regulator screw will project to substantially the full limit within the upright column but this, under the replacement conditions, is of no objection because this screw has no connection with the replacement shoe, the latter, as best shown in Figs. 3 and l, being free of any downward pro jection which might strike or be engaged by the regulator or present utilized clamping screw IS.

The mounting of the substitute guide shoe as a fixed element on the inner end of the replacement stud 2| and the turning of this stud by projecting lever 25 provides a range of adjustment sufiicient to carry the operation of the link l3 from a full stroke forward feed movement, through successively shorter and finally to reverse feed operations and, if desired, by a single continuous or instant adjustment of the single lever 25 and while the machine is either stationary or running. At'

any point in such range of adjustment the lever may be stopped and secured or be left free so that it may be instantly set back or changed at any time. The dial is in full plain sight of the operator and thus may serve as a constant guide and indication of the condition of parts and present operating effect of the machine.

The substitute parts are simple and inexpensive, rugged in character and readily substituted by anyone at all familiar with ordinar ewing machines, and with a screw driver as the only necessary tool.

Structure may be modified and changed in various ways. Thus, as shown in Fig. 5, an ordinary standard machine screw 25a may be substituted for the screw rod forming the adjusting lever 25 and the head of such machine screw be hidden within a hollow thumb nut 26a elongated and chambered at 33 to accommodate and conceal the head of such screw. This elongated thumb nut may be knurled on the outside to serve as a convenient grip and lever handle for shifting and securing the parts,

The screw rod 25 first shown may have a flattened outer end it for a finger grip and be secured in proper position in the operating head 24 by a lock nut ll.

To yieldingly retain the parts in adjusted relation a spring washer 42 may be located under the operating head 24 of the pivoted stud 2| The invention makes it possible to quickly and inexpensively convert a sewing machine originally built for forward stitching only into one useable for sewing in the reverse direction also and without any machining, welding, drillin or other operations on the machine head or on the members designed and cooperating to form the actual sewing mechanism.

What is claimed is:

1. A reverse feed and stitch regulator mechanism for a conventional sewing machine having a column in which a main shaft is journaled and which column has a bearing aperture with an axis 7 parallel to the main shaft and a screw hole with an axis at right angles to the main shaft, said mechanism including a stud rotatably extending in through said bearing aperture and having a head at the outer end outside the column and a uide shoe fixedly mounted on the inner end of of said dial mounting screw.

2. A reverse feed and stitch regulator mechanism for a conventional sewing machine having a column with a main shaft journaled therein and having a bearing apelture in the wall of the column whose axis is parallel to the main shaft and comprising a supporting stud for pivotal mounting in said bearing aperture, a guide shoe grooved for reception of a roller, at the inner end of said pivotally mounted stud and having a fixed screw connection therewith, said stud havin an elongated operating head at its outer end outside the column, a radially projecting, headed, leverforming machine screw screwed fast into said operating head, a thumb nut 0n the shank of said machine screw and having an elongated tubular finger grip extension enclosing the head of said screw and an indicating dial segment slotted for the passage of the shank of said screw and engageable by the inner end of said thumb nut lever operating grip.

MAX inowna.

REFERENCES CITED FOREIGN PATENTS Country Date Germany Sept. 23, 1962 Number 133,870

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