US1589625A - Sewing machine - Google Patents

Description

June 22 1926.

1,589,625 A. F. CARLSON SEWING MACHINE FiledSept. 5, 1925 s Sheets-Sheet 1 lnvenTor.

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June 22, 1926. Q

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A.F.CARLSON SEWING MACHINE Filed Sept. 5 1925 3 Sheets-Sheet 5 32 WnvenTor.

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' Patented June 22, 1926.

' UNITED STATES PAT ENT. .OFFICE;*i

. AXEL roman CARLSON, or cameraman, massaonvsn'rrs, Ass'IeNoB-To THE announnrrron HOLE macmms: COMPANY, OFYBOSTON'. mAssAcnusEr-rs, A coRroBA-- 'IION OF MAINE.

SEWING- MACHINE.

Application filed September 5, 1925.. Serial No. 5-t,'l87.' v

This invention relates to sewing machines of that type having a needle operating above the work and making penetrat-- ing thrusts through the work, and two loopers situated beneath thework each having a looper spreader associated therewith, .said loopers. operating alternately to engage the loops of needle thread thrown out from the needle and the spreaders co-operating with the loopers to spread each loop ofneedle thread and place it in positionto be efitered by. the needle at its next penetrating t rust.

In some sewing machines of this type, and

especially machines which are designed to sew buttonholes, the needle is provided with a jogging movement so that alternate thrusts of the needle are at the slit of the buttonhole and the other thrusts are through the work at a distance back from the slit, and the loopers and Spreaders are carried by a rotatable turret which is situated beneath the work.

My invention relates particularly to a sewing machine .ofthis type and one feature of the invention is the provision of novel means for actuating the loop spreaders by means connected to and actuated by the needle jogging mechanism. .This not only sim plifies the construction but ensures proper timing of the Spreaders. Other'features of my invention relate to a novel mechanism for actuating both. the loopers and the spreaders which is especially adapted for high speed operation, and also to a novel construction by which the amplitude of movement of the loopers and spreaders may be varied. W

In order to give an understandingof the invention I have illustrated in the drawings a selected embodiment thereof which will now be described after which the novel features will be pointed out in the appended claims.

Fig. 1 of the drawings is a side view a sewing machine embodying my invention with the cover plate removed to better .show the spreader-actuating mechanism; -Fig. 2 is an under sidev'iew illustrating part of the device for actuating the looper Fig. 3 1s a fragmentary view illustrating the loopers and spreaders and'their operatmechanism;

in j v ig. -4 is a sectional view showing the adjustment for varying amplitude of movement of the loopers;.; v I

v Fig. 5 is a view of th looper spreader;

Fig. 6 is a top plamviewof the looper carrier and looper spreader -withone of the loopers and its loopier spreader omitted, the other looper and its looper spreader being shown in the position'they assume while entering the loop of needle thread;

Fig. 7 "is a similar view showing the Tpreader in its position for spreading the oop.

In the sewin machine illustrated in Fig. 1,1 indicates t e base frame which carries .the head 2 in which is mounted the vertically reciprocatingneedlebar 3 carrying the needle 4. The needle bar, which is reciprocated by any suitable mechanism,- such for instance as that shown in Patent No.

. 1,437,847, December 5,1922, but whichmechanism has been omitted from the present drawings in order not to confuse-the same,

has a jogging movement in timed relation with its reciprocation. The means herein shown for jogging the needle is also similar to that illustrated inthe above-mentioned Patent No. 1,437,847. This needle jogging mechanism comprises..-a lever 5 pivotally mounted on a shaft 6 and vflexibly connected to a sleeve -7 through which .the needle'bar; reciprocates so' that rocking, movement of; the lever -5 will oscillatethesleevefl gill a vertical direction. --.Suc'h oscillatory movement of the sleeve-operates to give the needle bar its side jogging-movement-all as set forth in the above-mentioned patent. Inas much as this patricular mechanism for jogging the needle is not new with me I have not deemed it necessary to further illustrate it..

The lever 5 is actuated'from a cam 8 which .is mounted on a dirve shaft 9. This cam operates between the arms 10 of a forked member 11 which is pivoted to the head 2 at 12 and one arm, 10 of the fork is connected to the lever 5 through a link connection 13. The rotation of the cam 8 will, of course,-oscillate the forked member 11 and its oscillation is transmitted to the lever. 5 through the link 13 all as set forth in the above-mentioned patent.

The two loopers are indicated at 14 and 15, these being mounted on an oscillatory looper carrier 16 which is pivotally mounted at 17 on a turret 18, turret being,

mounted for rotation about a vertical axis in bearings 19 formed in the portion 20 of the frame, all as usual in sewing machines of this type. The looper spreaders are indicated at 21 and 22.-

Each spreader is provided with a stem or shank 81 which is pivotally mounted in the looper carrier 16 so that each spreader can swing from the position shown in Fig. 6 to that shown in Fig. 7. Each spreader is provided with a tail 82 which is acted upon by a spring 83 that normally tends to hold it in the closed position shown in Fig. 6. The spreaders receive their loop-spreading movement by means of aspreader 23 which is a forked member such as shown in Fig. 5 and is pivoted on the turret coaxially with the looper carrier 16. This spreader actuator has an oscillatory movement by means presently to be described and it is provided with the two bevel or cam faces 84 that engage the tails 82 of the spreaders as the spreader actuator oscillates whereby the Spreaders are swung from their closed to their open position or from the position shown in Fig. 6 to that shown in Fig. 7.

It will be understood that each spreader is in the position shown in Fig. 6 when the corresponding looper enters the loop of needle thread and that after the loop of needle thread has thus been; entered the ipreader actuator is operated as shown in ig. 7 to actuate the spreader and thereby spread the loop of needle thread, said looper and spreader carrying the loop into position to be entered by the needle on its next pene- I trat-ing thrust.

. 85 indicate hold downs which operate to retain the looper spreaders in position, said hold downs also acting as a stop for the Spreaders. A more complete description as to the manner in which the loopers and Spreaders operate in forming the stitches will be found in United States Patent No. 862,238, Aug. 6, 1907, to which reference ma be had.

e looper carrier is oscillated by means of the vertical reciprocation of a sleeve 24 which is mounted in the turret and which is given its vertical reciprocation by. means presently to be described. This sleeve has a collar 25 fast thereon which is connected by a link 26 to an arm 27 extending laterally fromthe looper carrier whereb vertical reciprocation of the sleeve 24 wi oscillate the looper carrier thus causing the loo ers alternately to engage the loops 0 needle thread. The looper spreader is given its oscillation to actuate the spreaders b means of the vertical oscillation of a spindle 28 which reciprocates vertically through the sleeve 24, said spindle having a collar 29 thereon which is connected by a link 30 to an I am 31 extending from the looper'spreader.

The parts thus far desribed are or may be all as usual in devices of this nature and their operation will be understood by reference to the above-mentioned "patents to which may be added Patent No. 1,352,280.

One feature of my present invention relates to a novel means for actuating the spindle 28 and thereby the Spreaders. This is accomplished herein by means which are connected to and are actuated by the needle jogging mechanism. The spindle 28, which extends entirely through the sleeve 24, is pivotally connected at its lower end to an arm 32 rigid with a shaft 33, the latter being journalled in suitable bearings 34. and 35 that are secured to the frame. This shaft 33 also has another arm 36 rigid therewith which is connected by a link 37 to one arm- 38 of an elbow lever 39 which is pivoted to the frame at 40. Theother arm 41 of this elbow lever is connected by the link 42 to the forked member 11 and, therefore, the oscillation of said forked member 11 will oscillate the elbow lever 38 and through the link 37 will oscillate the shaft 33. The rocking movement of the shaft 33 will reciprocate the spindle 28 as will be obvious thereby giving the spreader .actuator its required movement. By means of this construction the looper spreaders are always operated in timed relation with the movement of the needle and the operatin parts are of a con-- struction which is con ucive to high speed operation as all long levers, such as found in the above-mentioned patents, are eliminated and the parts which have a bodily movement are relatively light.

The needle jogging mechanism is provided with the usual adjustment for adjusting the extent of the jogging movement -of the needle, this adjustment being in the nature of a slot 53 in the lever 5 in which the end of the link 13 is adjustably secured.

In order to produce satisfactory stitching it is desirable to spread the loop to a greater extent as the jo ging movement-of the needle .is increased an I have, therefore, provided herein means whereby the amplitude of movement of the spreader actuator may be varied thereby to produce a greater or less looppreadin effect. This isaccomplished by an adjustable connection between the oscillatory forked member 11 and the elbow lever 39. It. will be noted that the link 42 is adjustably connected to the arm 41 of the elbow lever 39 by means of the slot 63 formed in said arm in which the end of the link 42 is adjustably secured. When the needle jogging mechanism is adjusted to make a stitch having along bight then a corresponding adjustment may be made in the connection between the link 42 and the arm 41 of the elbow lever so as to give the loop Spreaders a greater loop-spreading movement and similarly when the joggin movement is adjusted to form a stitch wit a relativel short bight a reverse adjustment may be e ected in the connection between the link 42 and arm 41 of the elbow lever 39.

For operating the sleeve 24 by'which the looper carrier is actuated I have provided a second rock shaft 43 which is journalled in suitable bearings 44 and which has fast thereon at one end an arm 45 that is pivotally connected to thelower end of the sleeve 24. The other end of said rock shaft has an arm 46 fast thereto to which is connected a link 47., This link is provided at its upper end with a roll 48 operating in a cam oove 49 formed in a cam member 50 which is mounted on the shaft 9. In order to guide the upper end of the link 47 and hold it ,in its proper position laterally said link is forked as shown at- 51, the fork of the link em-' bracing a hub 52 formed on the shaft 9 and thereby holding the upper end of the link.

from lateral movement. The cam groove '49 will reciprocate the link 47 vertica lythereby rocking the shaft 43 and the rocking movement of the shaft will be communicated to the arm 45.

The throw of the cam groove 49 is relatively slight and in order to give the sleeve 24 the proper amplitude of move ment I propose to give the shaft 43 an angular position as shown in Fig, 2 so that.the arm 45 will be longerthan the arm 46. This increased length of the arm 45 serves to give the sleeve 24' a greater amplitude of movement than the lmk 47 has and thus the required oscillating movement of the looper carrier may be secured with a cam havmia small throw.

le'to be'able to vary the ampli- It is desira 4 tude of oscillation of the looper to correond to the bight of the stitch or, which is t e same thing, the extent of jogging movement of the needle and I accom hsh this herein by providing an adjusta'b e connection between the link 26 and the arm 27. The arm 27 is shown as having an undercut I a clamping nut 59 by which the sleeve 54 is clamped in adjusted position. By loosen-' slot 58 therein and the link 26 has pivoted in its upper-end a sleeve .54 through which extends a bolt 55, the head 56 of which 00- cupies the slot 58. This bolt is providedwith ing the nut 59 the pivotal connection between the link 26 and the arm 27 may be adjusted thereby to vary the amplitude of movement of the looper carrier.

1. In a sewing machine having a needle mechanism,

jogging mechanism for spreaders.

2; In a sewing machine, the combination with a needle, of two loopers situated beneath the work, means to actuate the loopers,

a looper spreader for each looper, means to give the needle a jogging .movement, and means to actuate the looper spreaders by the needle jogging mechamsm.

3. In a sewmg machine, the combination with a needle, of two loopers situated beneath the work, means to actuate the loopers, a looper spreader for each looper, a cam actuated vibratory member for giving the. needle a jogging movement, and means actuated bysal member to operate the spreaders.

4. In a sewing machine, the combination with a needle arranged to penetrate the work from above, of two loopers co-o rating with said needle, a 100 er spreader f2) each looper, two rock sha ts, means to oscillate said rock shafts, and connections for o erating the loopers from one rock shaft and t e looper spreaders from the other rock shaft.

7 5. In a sewin machine, the combination.- with a needle a apted to netrate the work from above, of an osci ating looper carrier situated beneath the work, two loopers carried by said looper carrier; alooper spreader for each looper, a rock shaft for shaft for operating the looper spreaders, means for giving the needle a joggm ment, means for oscillating the rock shaft, and means actuated by the needle joggin mechanism for oscillating the second-named rock shaft. r 6. In a sewing machine, the combination with a needle, of two loopers situated be-. neath the work, means to actuate the loopers,

give the needle a joggmg; movement, and; means to actuate the looper spreaders by the needle jogging mechanism, both the needle Jogging mechanism and the means for actuating the loo'per spreaders being adjustable to vary the extent of both the jogging movement of the needle and .of the loop-spreading movement of the spreader's- 7. In a sewing machine, the combination with a needle of two loopers situated beneath the wor means to. actuate the loopers, a looper spreader for each looper, a cam, means actuated thereby to give the needle a jogging movement, other means also actuatedthereby to actuate the-looper Spreaders, each of said lastanamed meansbeing adjustable, whereby theamplitude of the needle jogging movement and the extent of the loop I whereof, I have signed my I spreadmg' movement may be varied.

In testimony name to this specification.

. .AXEL F. CARLSON.

operating the looper on e5 actuating the r carrier, a second rock gmoverst-named a looper spreader for each looper, means to P

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