US2095647A - Sewing machine - Google Patents

Description

Oct. 12, 1937.

J. MANN 2,095,647

SEWING MACHINE 3 Sheets-Sheet 1 Filed March 14, 1936 JOSEPH MANN INVENTOR BY AT RNEY J. MANN SEWING MACHINE Oct. 12, 1937.

3 Sheets-Sheet 2 Filed ,March 14, 1936 V NN JOSEPH MANN INVENTOR S & Q 7

ATTORNEY J. MANN Oct. 12, 1937.

SEWING momma Filed March 14, 1936 s Sheets-Sheet 3 (JOSEPH MANN INVENTOR lllli Patented Oct. 12, 1937 PATENT OFFICE snwmo mcnmn Joseph Mann, New York, N. Y., assignor to Consolidated. Sewing Machine & Supply 00., Inc., New York, N. Y., a corporation of New York Application March 14, 1936, Serial No. 68,864

2 Claims.

This invention relates to machines for sewing belt loops and articles of that nature.

Special objects of the invention are to incorporate and combine in the machine the mechanism necessary for trimming material into strip form, folding and feeding the strip to the needles and then severing the stitched material in the desired lengths. Y Other objects of the invention are to combine all such parts in simple, practical form, cooperating efficiently with the mechanism of standard types of sewing machines now in use.

Other objects and the novel features of construction, combination and relation of parts by which the desired results are attained are set forth or will appear in the course of the following specification? The drawings accompanying and forming part of the specification illustrate one practical .embodiment of the invention. It will be appreciated however that details of the structure may be varied, all within the true intent and broad scope of the invention as defined in the claims. Fig. 1 is a broken plan view of an embodiment of the invention incorporated in a more or less standard design of double needle sewing machine. Fig. 2 is a broken end elevation of the machine. Fig. 3 is a broken perspective view comparable with Fig. 2, to illustrate the successive stages of operation on the material.

' Fig. 4 is a broken partly sectional rear view of j the cut-off mechanism, as on substantially the plane of line 4--4 of Fig. 1.

Fig. 5 is a broken sectional view of the feed and holding clutch mechanism, as on substantially the plane of line 5-5 of Fig. 1.

Fig. 6 is a broken part sectional view of the feed clutch, substantially as on line 6-6 of Fig. 5 and Fig. 7 is a corresponding view of the holding clutch substantially on line 1-1 of Fig. 5..

In Figs. 1 and 2, the base of a more or less typical two-needle sewing machine is indicated atl0, having the main shaft journalled therein and carrying the overstanding arm I 2, in which the needle bar l3, and the presser foot I4, are mounted and operated in the usual way.

' The two needles are indicated at l5, and these may cooperate in the usual way with a looper to produce the side seams 16, connected by. the

cross-stitching Fig. 3.

By reference to Fig. 3, it'will be seen'that the successive stages in the operation of the machine involve the feeding in of a rough edge strip of material l8, appearing at the right in this view,

the trimming of the opposite edges of this strip at IS, the folding in of these'trimmed edges into the overlapping relation indicated at 20, the edge and cross stitching of these folded portions at l6, l1, and the severance of a proper measured 5 length of the stitched tape or belt loop material as indicated at 2|.

The mechanism for these several operations comprises in the illustration a rough surfaced feed wheel 22, for forwarding the strip material 10 over the work table 23, beneath the stationary presser or hold-down guide 24, to the trimming knives 25, 26, which cooperate with the stationary blades 21, 28, to trim away the rough edges; the folding guide 29, between the trimming knives 15 and stitching mechanism and the cut-oif knife 30, cooperating. with the stationary blade 3|, -at the back of the stitching mechanism.

Considering these several devices in the order mentioned, the feed wheel 22 is carried by a short 20 shaft 32, Fig. 1, journalled in a bracket 33, pivotally mounted on the base at 34, and downwardly tensioned by a spring 35, to hold the roll yieldingly engaged with the work and to permit the roll being raised clear of the work table. Be- 25 cause of this movable type of mounting, a flexible form of drive is required and this is shown as a section of shafting 36, having universal joints 31, and longitudinally extensible at 38.

The intermittent movements necessary to turn 30 the feed wheel in time with the needle action are provided in the illustration by the ball clutch mechanism shown in detail in Figs. 5 and 6, and comprising an oscillating arm 39, connected with the inner member 40, having inclined recesses 35 4|, receiving the spring pressed balls 42, which make wedging engagement with the outer clutch member 43, secured by set screw 44, fast on shafting 45, connected with the feed wheel shafting 36, through one of the universal joints, Fig. 1. 40

Reverse motion of the feed wheel drive shafting is prevented in the illustration by holding mechanism of the same type as the ball clutch just described. This is shown in Figs. 5 and 7, as an inner clutch member 46, fixed to the bearing 5 bracket 41, in which shaft 45, is journalled and having reversely faced inclined wedge seats 48, for spring pressed balls 49, in cooperative engagement with the outer surrounding clutch member 43. As will be apparent from Fig. '7, this 5 second ball clutch, having the fixed inner member is effective to prevent backward turning move ment of the outer clutch member and hence the shaft to which it is fixed, but freely permits the forward turning movements of the clutch barrel 55 effected by the oscillating arm 39. The latter is shown as slotted at 56, to receive the adjustable stroke determining connection at the end of link 52, Figs. 1 and 2, which is engaged at its lower end with an eccentric 53, on the main shaft II.

The trimming knives 25, 26, which are located at opposite sides and back of the feed wheel 22, are shown as carried by properly spaced rocker arms 54, projecting forwardly above and at opposite sides of the folder 29, from a rock shaft 55. The latter is indicated as having a rearwardly extending rock arm 56, adjustably fixed thereon at 51, and pivoted at the rear to a link 58, engaged with an eccentric 59, on shaft II.

The cut-01f knife 30 is shown in Figs. 1, 2 and 4', as sleeved at 60, on a pivot support 6|, and pressed by spring 62, toward the cooperating fixed blade 3 I. The movable blade is shown in Fig. as having an angularly projecting arm 63, pivotally connected by link 64, with one arm of a horizontally positioned bell crank 65, Fig. 1, and the other arm of this bell crank is shown as connected by pivot link 66, with the upper end of a cam lever 61, pivoted at 68, Fig. 2, and having a cam projection 69, for engagement by a cam lug 10, Fig. 1, on the clutch barrel 63.

These meeting cam lugs are shown as fairly sharply angled, so as to produce a relatively quick cutting stroke and return of the knife for each revolution of the clutch barrel and hence for each revolution of the feed wheel connected therewith. By substituting feed wheels of smaller or larger diameter, shorter or longer lengths of belt loop may be finished and cut for each complete revolution of the clutch. To enable quick substitution of different sizes of feed wheels, they may be removably secured on the shaft 32, ,as by set screw or equivalent, such as indicated at H, Figs. 1 and 2. The yielding pivotal mounting 33, of the feed wheel shaft and the universal drive shafting therefor enables this substitution wheel.

An outwardly and downwardly inclined guide for the cut lengths of loop is indicated at I2, Figs. 1 and 2, for directing these away from and clear of the cutting knife.

The machine can be readily set for different lengths of belt loops by substituting feed wheels of different diameters and by changing the feed stroke of the clutch through the medium of the adjustable connection at 50, 5|, with the clutch operating lever 39. v

The trimming knife arms 54, are shown as adjustably secured on the rock shaft 55, by split clamps 13, so that they may be set for different widths of strip material and the folder 23, may be made in two relatively separable parts adjustably secured on the work table by screws M, Fig. 1, to accommodate difierent widths of material.

The several parts of the invention are all mounted on the sewing machine base, forming in effect integral parts of the sewing machine, thus avoiding any auxiliary or accessory parts. The added mechanism is all relatively simple and sturdy with no fragile parts likely to get out of order andcan be combined in present machines with simple modifications of the same. While particularly designed for manufacture of belt loops, it will be appreciated that the machine may be used for many other similar purposes and it will be realized also that the actual physical structure may be altered and modified in various ways, all within the broad scope of the following claims.

The feed dog is shown in Fig. 1 as made in two portions 15, spaced at opposite sides of the two needles, so as to leave the folded strip material which is being stitched free to be advanced entirely by the intermittently acting feed wheel 22. To direct the strip thus between the arms of the feed dog, the folder is shown provided with parallel longitudinal guide extensions 16, at the opposite sides of the needles. The function of the feed dog in this instance, is simply to lift the presser foot I4, during the advancing movements of the feed roll. The feed dogs therefore do not interfere in any way with the change in strip feeding movements effected by the substitution of difierent feed rolls. The driving of all parts of the mechanism from the one main shaft assures the desired accurate timing of the parts. The two trimming knives 25, 26, form a twin edge trimmer" for the opposite edges of the strip enabling material of any width or irregularities to be fed into the machine, without any previous cutting or trimming of the same.

What is claimed is:

1. In combination with a two needle sewin machine having a work table, a presser foot and a feed dog constructed with separated portions spaced at opposite sides of the two needles, a strip folder extending inwardly over the worktable and having folded strip edge guides extending in between said spaced portions of the feed dog and the needles, spaced strip-cutters at opposite sides of and at the entrance to said strip folder, feed roll mechanism between said spaced strip cutters and means for operating said feed roll mechanism and spaced strip cutters in timed relation with said needles, feed dog and presser foot.

2. In combination with a two needle sewing.

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