US2064973A - Sewing machine - Google Patents

Description

Dec. 22, 1936. A GALLENS 2,064,973v

SEWING MACHINE Filed F'eb. 6, i936 2 Sheets-Sheet 1 2 5 "f' J a-Jf 24| 3 4 2 V- ,/0 5.' LI.- j FTF l.- Lm* 39 1 M s rr- 45 l 1/ 44 43 4f ,f

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Dec. 22, 1936. A GALLENS l 2,064,973

SEWING MACHINE Filed Feb. 6, 1936 2 Sheets-Sheet 2 6 VvE/vra@ '5%' PMRDN 6mm@ ATTORNEY Patented Dec. 22, 1936 YUNITED STATES PATE OFFICE SEWING MACHHWE Application February 6, 1936, serial No. 62,559

3 Claims.

This Yinvention'relatestonew and useful mprovements in a sewing machine.

vAt the present time there are machines for Sewing with a .zig-Zag ystitch and other machines .forsewing with ablanket stitch. The object of thisinvention is to providea mechanism for attachment .upon machines which sew with a zigzag stitch whereby they may be converted very easily to sew with the blanket stitch when desired.

More specifically, the Vinvention contemplates in'combination'with a machine capable of sewing a zig-zag stitch, a mechanism which may be placed into Voperation or removed from operation to control the sewing to change the type of stitch.

Another object of -the invention is the construction of adev-ice asrdescribed which is simple Vyand'durable andvwhich may be manufactured and vsold at a reasonable cost.

VFor further comprehension of the invention, and of the objects and advantages thereof, reference'will be had to the following description and Vaccompanying drawings, and the appended claims in which the variousnovel features of the invention are more .particularly set forth.

In vthe accompanying drawings forming a material `part of this disclosure:

vFig. 1 is a Vfront ,elevational view of certain parts of the mechanism .of a sewing machine to which the addition, according to this invention, has been applied.

Fig. '2is a bottom view of some of the mechanism shown in Fig. 1.

Fig.`3 is a sectional view taken on the line 3 3 of Fig. .1.

Fig. 4 is asectional View taken on the line 4 4 of Fig. .3.

Fig. .5 is a sectional view taken on the line Fig. 6..is a sectional view taken on the line 6 6 of Fig..2.

Fig. 7 isa sectional view on the line 1 7 of Fig. `V2.

Fig. 8 Ais a sectional view on the line 8 8 of Fig. 2.

Fig. 9 is a schematic view showing the zig-zag stitch produced by the machine.

Fig. 10 is a schematic view showing the blanket stitch produced by the machine.

The invention is intended, in combination with a sewing machine having Ia laterally extending drive :shaft IB providedwitha crank II reciprocating aneedle bar I2 journalled in a laterally vibratory frame I3. .-jA reciprocatory cloth feeder (Cl. Ilz-168) I4 is supported by a crank I5 in a pivotal shaft I6 capable of simultaneously raising and lowering the cloth feeder during the reciprocation thereof. A pitman I1 supporting the Vcloth feeder I4 as clearly shown in Fig. 8 is connected I5 with a crank I8 mounted on a pivotal bar I9. This pivotal bar is equipped with another crank 2B moved by a pitman 2l connected with a cam 22 on the drive shaft I0.

The dot and dash lines 23 in Fig. 1 represent I0 the conventional body of the sewing machine. This body is provided with bearings 24, also Shown by dot and dash lines, which rotatively support the drive shaft I. A pulley 25 is vmounted on the extended end of the shaft `Il) by l5 which'the sewing machinemay be driven.,

Within the body of the sewing machine Ythere is a pulley 26 on the drive shaft IEB which connects with a flexible belt 21 extending over a pulley 28 on a shaft 29 within the pivotal shaft *go it. This shaft 29 extends from the other end of the pivotal shaft and is provided with a gear 30 meshing with a gear 3| on a shaft 32 supporting the thread hook member 33 of the sewing machine. Up to this point the sewing machine is of 25 conventional construction. Further details of the machine will not be given in this specification since they form no part of the invention and they are well-known in the art.

The invention comprises an auxiliary shaft 35 l30 rotatively supported in bearings 36 and v3'1 upon the body 23 of the sewing machine. A gear reduction is housed between these shafts. This gear reduction comprises a pinion 38 upon the drive shaft I0 meshing with a gear 39 upon the' 35 auxiliary shaft 35. A cam 4B is mounted upon the auxiliary shaft 35 and is for the purpose of holding said vibratory frame I3 in one lateral position for a pre-determined number of cycles of the needle bar, and in another lateral position 40 for another pre-determined number of cycles of the needle bar.

More specifically, a rod 4I pivotally connects with the vibratory frame I3 and is supported by a pair of links 42 and 43. The link 43 is.45 pivotally supported at the end 43 upon the body 23 of the sewing machine. The links 42 and 43 are pivotally connected at their outer ends by a pin 44. The link 42 is pivotally connected at its inner end upon the rod 4|. A spring 45 is con- "50 nected between the extremity of the rod 4I and a pin 4B mounted upon the body 23 of the sewing machine. The spring 45 serves to hold the end of the rod 4I against the cam 45. The Cam fichas an enlarged portion 40a which is 155 l upon the shaft I6.

yin the pitman I 1.

capable of forcing the end of the connecting rod 4I upwards for aA certain period of time. this upward motion is translated by the links 42 and 43 into a lateral motion which moves the vibratory frame I3.

According to a preferred embodiment of the yinvention the cam portion a is of a size substantially one-third ofthe periphery of the cam so that the needle bar I2 will remain extended towards the left as viewed in Fig. 1 for two cycles, and move to the right for one cycle. The ratio between the gears 38 and 39 is 1:3. Thus, for each three times the drive shaft II! rotates the shaft 35 will rotate once.

Another cam 49 is mounted upon the auxiliary shaft 35 and is formed with a cam groove 49a having a portion thereof concentric with the auxiliary shaft 35 for two-thirdsof the circumference and a portion extended radially from the auxiliary shaft 35 for the remaining onethird of the circumference. A roller 50 works in vthis cam groove 49a and projec'tsfrom the head 5I of a pitman` 5I. Thispitman has an elongated slot 5Ib through which the auxiliary shaft 35 extends. The arrangement is 'such that the pitman may move vertically upwards anddownwards. Furthermore, itwill remain in one position for two-thirds of a revolution of the auxiliary shaft 35, and then inthe remaining one-third will move downwards and back upwards to its original position. This pitman 5| connects vwith a crank 52 releasably mounted The crank 52 is composed of two sections engaged on opposite sides ofthe shaft I6 and xedly held when desired by screws 53. When these screws are loosened the crank is free on the shaft I6.

Another cam 54 is mounted on the drive shaft I0 and operates a pitman 55 which is connected with a crank 56 releasably mounted upon the shaft I6. This crank is provided with a screw 51 which may be tightened or loosened for connecting the crank with the shaft or disconnecting the crank. The crank I5 is connected with a block I5a which slidably engages in a slot .Ila The lsliding of theblock in the slot has no effect, but the turning of the crank I5 serves to raise or lower the cloth feeder I4 into operative or inoperative positions.

The operation of the device is as follows: Assume the crank 52to be loose on the shaft I6 and the crank 5S to be tight on the shaft. When the device is in this condition the shaft I6 will have one cycle of oscillation for each rotation of the drive shaft I9. The cloth feeder I4 is therefore operating continuously to move the cloth forwards. For each rotation of the shaft I0 the bar I9 will oscillate once which will move the crank It and the pitman Il so that the clothy feeder I4 is reciprocated at the same time it is being moved upwards and downwards. These actions are harmonized as in a regular sewing machine so that the cloth feeder is in the raised position when moving forwards, and in the lowered position when moving rearwards. The ymachine is now sewing stitches asshown in Fig. 9. Thus a zig-zag stitch, though not la true zig-zag stitch, is formed because one of the points on one of the sides is fiat. The stitch is produced by the fact that the cloth feeder I4 is operating continuously and the needle makes two stitches on one side and the third stitch on the other side. The point 60 represents the first stitch on one side; the point 6I represents the second stitch on the same side; and the point 62 represents the third stitch on the other side. The cycle repeats, the next stitch being 60' on the rst side, etc.

If it is desired to form blanket stitches the crank 56 is loosened on the shaft I6 and the crank 52 is tightened on the shaft I5. The needle will continue to stitch two stitches on one side and one stitch on the other side, but the cloth feeder I4 will advance the cloth only once during each of its three stitches. The reason for this is that the cam 49 holds the shaft I6 in a position in which the cloth feeder is lowered. Then, even though the bar I9 is oscillating which reciprocates the cloth feeder, the cloth feeder is inoperative as it is in a lowered position. During one-third of the revolution of the cam 49, the pitman 5I will be moved to pivot the pivotal shaft I6 so that the crank I5 lifts the cloth feeder I4 into operative position.

The stitch produced by this operation is shown in Fig. 10 and may be traced as follows.: The first stitch 60 is taken on one side; the cloth feeder moves to operate the cloth so that the second stitch occurs at the point 6I. During the third stitch the vcloth feeder 4is inoperative so that the third stitchoccurs at 'the point 62. The fourth stitch occurs at the point 60', and thus the operation continues. f

In Fig. l0 the points 6I and '60 are really superimposed, but for clarity in illustrationthey have been shown slightly spaced from each other. y

While I have illustrated and described my invention with some'degreeof 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 of the correlated parts without departing.l from the spirit of the scope of the appended supported by a crank ona pivotal shaft capable' of simultaneously raising and lowering the. cloth feeder during the reciprocation thereof, and a crank for reciprocating said cloth feeder mounted on a pivotal bar equipped with another crank moved by a pitman connected with a caml to said drive shaft, the combination of va cam on said drive shaft continually operating a pitman connected with a crank releasablymounted on said pivotal shaft, an auxiliary shaft, a gear reduction between said auxiliary shaft and saidv drive shaft, means including a cam on said auxiliary shaft for holding said vibratory frame in one lateral position for a pre-determined number of cycles of said needle bar and in another lateral position for another pre-deter-y leasedr and said other crank xed on said pivotal shaft for causing the sewing machine to sew with another type of stitch.

2. The device as dened in claim 1, but in which the gear reduction has a ratio of 1:3 so that the drive shaft turns three times for each rotation of the auxiliary shaft, and in which the latter-mentioned cam on the auxiliary shaft moves the pitman once for each rotation thereof.

3. In a sewing machine, a stitch producing mechanism comprising, in combination, a laterally extending drive shaft provided with a crank reciprocating a needle bar in a laterally vibrating frame, a longitudinally reciprocatory cloth feeder supported by a crank on a pivotal shaft capable of raising and lowering the cloth feeder simultaneously during the reciprocation thereof, a crank for reciprocating said cloth feeder mounted on a pivotal bar equipped with another crank moved by a pitman connected with a cam to said drive shaft, an auxiliary shaft at right angles to said drive shaft, a casing encasing said drive shaft and auxiliary shaft except for an extended end of the auxiliary shaft, a gear reduction between said auxiliary shaft and drive shaft, means including a cam on said auxiliary shaft for holding said vibratory frame in one lateral position for a pre-determined number of cycles of said needle bar, and in another lateral position for another pre-determined number of cycles of said needle bar, a cam body xed upon the extended end of said auxiliary shaft and slightly spaced from said casing and having its inner face formed with a cam groove, a pitman formed with an opening engaged upon said auxiliary shaft and being slidably mounted between said cam body and said casing, a pin on said pitman engaging the cam groove of said cam body, said cam being adapted to periodically move the pitman, and a crank connected with said pitman and releasably connected with said pivotal shaft.

AARON GALLENS.

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