US2113969A - Sewing machine - Google Patents

Description

April 12, 1938. H. wElssMANN 2,113,969 v SEWING MACHINE 2 Shets-Sheet 1 Filed May 27, 1957 BY HENRY` Wel'ssMaNN A TT ORNE Y April 12, 1938. H. wlalssMANN l 2,113,969

' SEWING MACHINE Filed May 27, 3.93"? 2 Sheets-Shea# 2 [NVENTOR 'BY HENRY WesssnNN l W WAATTORNEY Patented Apr. 12, 1938 Henry Weiss-mann Islan Stapleton, Staten Application May 27, 1937, Serial No. 145,014

4 claims.

This invention relates to new and useful improvements in the bobbin mechanism of a sewing machine. s

'I'he invention has for an object the construc- 5 tion of a bobbin mechanism which is characterized by a'bobbin container for the thread, an annular gear around said container and rotatively supported at its edges for supporting'the container, and a novel arrangement for permitting the top thread loop passing around the bobbin to interengage with the bobbin thread.`

Another object of the invention is the construction of a device as mentioned which is simple and durable and which may be manufactured and sold at a reasonable cost.

For further comprehension of the invention, and of the objects and advantages thereof,l reference will be had to the following description and accompanying drawings,'and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure- Fig. 1 is a side elevational view of a machine constructed according to this invention.

Fig.` 2 is a fragmentary enlarged elevational view looking in the direction of the line 2-2 of Fig. 1.

Fig. `3 is a sectional view .taken on the line 3-3 of Fig. 2.

Fig. 4 is a side elevational view of the bobbin container per se, with the thread loop schematically applied.

Fig. 4a is a fragmentary horizontal sectional view taken on the line 4a of Fig. 4.

Fig` 5 is a sectional view taken on the line 5 5. of Fig. 2.

Fig.`6 is a sectional view of a bobbin container constructed according to another form of the invention.

Fig. 7 is atransverse sectional view similar to Fig. 3 but illustrating another formof the invention, a simpliiied form.

VIn Fig. 1 a standard sewing machine III is illustrated having the customary cast base plate Ia, the wheel drive I 0b, the needle bar I 0c, and the pressure foot IUd. The details of this sewing machine will not be given in this specication since they form no part of the invention.

The invention resides in the provision of a bobbin container II formed with a passage IIa for the thread. An annular gear I2 is mounted around `the container and has the root I2a between a pair of' adjacent gear teeth cut deep (see Figs. 2 and 4a.). Top-thread loop catching hooks I3 and Il are mounted on the container II at the sides of the gear I2 to guide the loop of thread I4' into the cut I2a of the gear I2 (see Fig. 4).- Three rotatively supported pinions Ia, I5b and I5c have flanges I5 en- 5 gaging the sides'of the gear for rotatively supporting the same. 'I'hese flanges are formed with peripheral cuts I5' synchronized to align with the cut I2a in the gear I2 to pass said thread loop during the rotation of the gears.

The bobbin container Il comprises a base portion IIb having a central projection IIc on which a bobbin Ild is rotatively supported. A cover IIe engages over the top of the base portion and is removably supported in position by a peg II f engaging into an opening in the projection IIc. The space IIa occurs between the peripheral edges of the body IIb and the cover IIe. The cover may be removed to replace the bobbin.

The annular gear I2 is attached to the top portion of the container body IIb. The thread catching hook I3 is soldered or brazed to the top face of the gear I2. The thread catching hook I4 is disposed immediately below and is formed by a projecting end of a strip I la. which is soldered or brazed upon the container and extends in a helical band and constitutes a cam for the purpose hereinafter described.

The pinion gear I5a is rotatively supported in a bracket I1 which is attached to the underside of the base Illa. The pinion I 5b is supported on a bracket I8 similarly supported. The pinion I5c is supported on a bracket I9, also similarly supported. One of `the pinion gears, the pinion gear |511, is driven and synchronized with the sewing machine. This pinion gear is mounted on a shaft 20 which is`provided with a bevel gear 2I meshing with a gear 22 on a rotatively supported shaft 23 connected by gears 24 with a shaft 25 extending upwards into the body of the sewing machined and connected Withsome rotating part thereof. The details' of this connectionare not shown on the drawings as they form no part of the invention. The connection should be such that -the bobbin container II is caused to rotate two complete revolutions for each cycle of the needle bar IIJc.

Certain mechanism is provided for assisting the top thread loop I4' to engage around the bobbin container II. This mechanism includes the cam strip Ila which tends to guide the thread loop downwards over the bottom face of the bobbin container. This mechanism also includes an arm 28 which is pivotally supported at its outer ,end on a bracket 29 attached on the base I 0a. A pintle 30 is used for the pivotal supporting. A spring 3| is coaxial on the pintle and acts between the bracket 29 and the arm 28 for normally urging the arm upwards. A member 32 is mounted on the arm 28 -and extends under the cam I4a (see particularlyFig. 3) in a manner so as to pivot the arm downwards as the bobbin container turns. 'I'he free end 28' of the arm 28 is adapted to engage into the loop of the top thread as it is formed by the needle and to move the loop downwards (see Fig. 4) so as to help maintain the thread of the loop to extend along the cam strip I4a.

The cam strip Ila extends substantially onehalf of the circumference of the bobbin container and then the member 32 drops off the end of the cam and is snapped upwards to its original position, indicated by the dot and dash lines 28a in Fig. 5. 'I'here is a small projection 33 on the body of the bobbin container I I immediately above the end of the cam I4a to prevent the loop thread from slipping back over the bobbin container. 'I'he loop thread is now more than half way around the container and as the gear I2 turns and the loop is drawn upwards it will finish its circling act.

'I'he machine base Illa is formed with openings in its top face which are closed by conventional slides 34. It is also provided with a plate 35 for the feeders 36. This plate has an opening 31 for the needle 38 of the sewing machine to engage through. The feeders 36 are operated in the usual manner and so is the needle.

In Fig. 6 a modied form of bobbin container is disclosed which comprises a container 4I having a top cover 42 engaging into the top thereof. This cover has a central opening 43 through which the thread 44 from the bobbin 45 may pass. The container 4I is provided with the gear I2. In other respects this bobbin container is identical to that previously shown and its position and operation are the same.

The operation of the device is as follows:-

When the needle 38 reaches its lowermost position and then starts to travel upwards, the top thread in the needle is slightly looped. The loop catching hooks I3 and I4 catch this loop I 4 and drop a portion of it'into the deep cut root I2a between a pair of the teeth of the gear I2. The bobbin container II is being turned by the drive which connects with the pinion gear I5a. The flanges I5V have niches t5' which are synchronized with the root I2a to permit the thread to pass the anges of each of the pinion gears as the bobbin container II turns. The lower portion of the thread loop I4 guides along the cam I4a and the loop I4 is also caught by the end of the arm 28 which moves it downwards at the same rate as the pitch of the cam strip Ila so that the loop extends along the said cam strip I4a. 'Ihis cam strip guides the loop to the bottom of the bobbin container and so the loop extends completely around the bobbin container and catches the bobbin thread. The arm 28 is moved downwards by the member 32 engaging the cam Ida, and when the member 32 is dropped the arm 28 will move back to its original position and be ready for the next thread loop. This arm will be moved downwards again when the bobbin container II reaches its initial position, since then the finger 32 will again engage beneath a portion of the cam strip I4a which will again move it downwards.

In Fig. 7 a simplified form of the invention has been disclosed. This form is a preferred one. Essentially, it consists of a bobbin container II' of comparatively shallow. depth and formed with a passage II a for the thread. Y An annular gear I2' is mounted around the container II and is substantially of the same width as the depth of the container- II'. The gear I2' has one root between a pair of adjacent gear teeth cut deep, indicated by numeral I2a. This deep cut root I2a is synchronized with the cuts I5' on the flanges `I5 of the supporting gears which support the gear I2 in the identical manner previously described. These same parts are indicated in Fig. 7 by the same reference numerals used in the prior disclosure.

Mounted on the gear I2 at the deep root cut location I2a there is a top hook I3. This hook is above a bottom hook I3a. This bottom hook I3a is substantially at the same position as the bottom face of the container II.

The container II is illustrated with a removable cover IIe and houses a bobbin IIdd. In

other respects this form of the invention is identical to the previousform and the corresponding parts may be recognized by the same reference numerals, except for the fact that it lacks the cam strip Ida, the arm 28, and the other associated parts for guiding the thread around the container. This form of the invention does not need the guiding means since it is of a narrow enough width for the thread to engage around the container by itself.

The operation of this form of the device is as follows:-

The top thread which is carried down by the needle 38 forms a loop I 4' which is picked up simultaneously by the two hooks I3 and I3a. 'I'hen a portion of the loop falls into the root I2a. As the container II rotates the loop I4' will be drawn over theentire container II' and catch the thread o'f the bobbin.

While I have illustrated and described my invention with some degree of particularity, I realize that in practice various alterations therein may be made. I therefore reserve the right and privilege of changing the form of the details of construction or otherwise altering the arrangement ofthe correlated parts without departing from the spirit or the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to have secured by United States Letters Patent is:-

1. In a sewing machine, a bobbin container with a passage for the thread, an annular gear around said container and having the root between a pair of adjacent gear teeth cut deep, top thread loop catching hooks mounted on said containe';- at the sides of said gear to guide the loop into said cut of said gear, rotatively supported pinion gears meshing with said gear and havingl flanges engaging the sides of said gear and rotatively supporting same, said flanges having peripheral cuts synchronized to align with said cut in said gear to pass said thread loop during rotation of said gears.

2. In a sewing machine, a bobbin container with a'passage for the thread, anrannular gear laroundV said container and having the root between a pair of adjacent gear teeth cut deep, top thread loop catching hooks mounted on said container at the sides of said gear to guide the loop into said cut of said gear. rotatively supported pinion gears meshing with said gear and having flanges engaging the sides of said gear and rotatively supporting same, said anges having peripheral cuts synchronized to align with said cut in said gear to pass said threadloop during rotation of said gears, said container being much deeper than the depth of said gear, a spiral cam along the side of said container and connecting with one of said hooks for guiding the thread loop around said container.

3. In a sewing machine, a bobbin container with a passage for the thread, an annular gear around said container and having the root between a pair of adjacent gear teeth cut deep, top thread loop catching hooks mounted on said container at the sides of said gear to guide the loop into said cut of said gear, rotatively supported pinion gears meshing with said gear and having iianges engaging the sides of said gear and rotatively supporting same, said flanges having peripheral cuts synchronized to align with said cut in said gearto pass said thread loop during rotation k'of said gears, said container being much deeper than the depth of said gear, a spiral cam along the side oi' said container and connecting with one of said hooks for guiding the thread loop around said container, and a follower resiliently supported and moved by said cam and engageable with said thread loop for guiding the thread -loop of said cam.

4. In a sewing machine, a bobbin container with a passage for the thread, an annular gear around said container and of a substantial width in relation to the width of said container, rotatively supported pinion gears meshing with l said gear and having anges engaging the sides of said gear and rotatively supporting same, means for driving oneL of said pinion gears, and top thread loop catching hooks superimposed and on opposite sides of said gear for catching the top thread looped by the needle and guiding said loop between a pair of teeth of said gear and then around said bobbin container.

l HENRY WEISSMANN.

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