DE1200110B - Chain stitch sewing machine for sewing in opposite directions - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

Number:
File number:
Registration date:
Display day:

D05b

German class: 52 a -43/08

1200 110
U 8512 VII a / 52 a
2nd December 1961
September 2, 1965

The invention relates to a chain stitch sewing machine for sewing in opposite directions with a Moved in a plane parallel to the fabric support plate and below this, to form a thread triangle made of a needle thread loop, looper thread and looper blade serving spreader.

It is known that to enable reverse sewing with a double chain stitch sewing machine a spreader is provided, which independent of the formation of the thread triangle for the insertion of the needle caused by the sewing direction in a certain position.

In the case of a button sewing machine that does not give the fabric any feed motion, the fabric will move Spreader approximately elliptical in the rhythm of the gripper, but the sequence of movements of the spreader is so that proper release of the threads from the gripper is not guaranteed.

At the moment the thread loop is thrown off the hook, the spreader moves at right angles Hg to this, so that, especially with high-speed machines, there is no guarantee that a proper thread loop shedding occurs.

The present invention serves to remedy this disadvantage.

According to the invention, this is achieved in that the spreader is so phase-shifted in an elliptical path is controlled with respect to the gripper that the spreader head with respect to the needle path moved in the opposite direction to the gripper.

This coordination of the movement sequences of the spreader and the gripper removes the spreader on a diverging path from the hook and thus also from the needle thread loop after the needle has entered the thread triangle. This will certainly be an inhibition when Throwing off the needle thread loop from the hook point and when tightening the needle thread loop avoided against the fabric. The solvents required to solve this technical problem can be of any known type.

In the drawings, the idea of the invention is in one embodiment on a sewing machine shown, namely shows

F i g. 1 shows a vertical section through the housing of a zigzag sewing machine with a spreader,

F i g. Figure 2 is a side view of the machine of Figure 2. 1 partially in section, with the head cover removed,

F i g. 3 shows a cross section through the machine along line 3-3 in FIG. 1,

F i g. 4 is a partial view in section with the chainstitch sewing machine for sewing in FIG
opposite directions

Applicant:

Union Special Machine Company,

Chicago, JH. (V. St. A.)

Representative:

Dr. A. Mentzel and Dipl.-Ing. W. Dahlke,

Patent attorneys,

Refrath near Cologne, Frankenforst 137

Named as inventor:

Edgar Schoij,

Clarence Carlton Smith, Chicago, JIl. (V. St. A.)

Claimed priority:

V. St. v. America 6 December 1960 (74192)

drive parts for the needle evasive movements of the hook,

F i g. 5 is a perspective view of a part connected to the spreader rod,

F i g. 6 a top view of the machine base with the table top removed,

F i g. 7 the interaction of two needles, a single hook and a spreader,

F i g. 8 the interaction of two needles, two hooks and two spreaders,

F i g. 9 a console for a pivot of the spreader rod,

10 shows the pivot,

11 shows the interaction of needle and hook and spreader when making a two-thread zigzag chain stitch,

FIGS. 12 to 17 show a representation similar to FIG. 11, but in different positions during the stitch formation,

18 shows the spreader mechanism with respect to the looper and needle in five different points of a sewing cycle of the machine.

In the exemplary embodiment shown, the idea of the invention is based on a chain stitch zigzag sewing machine realized. The machine includes a base portion 10, one at one end thereof

509 659/153

3 4

supported vertical stand and one over- (Fig. 1) articulated, which with an adjustable ex-hanging Arm which cooperates from the vertical center 62 on the main shaft 14. Stand 11 extends over the base part and an arm 63 of the push rod 56 is on one runs out into a head 13. The base part of the Ma rod 64 hinged, which has a bearing part Machine encloses a main drive shaft 14 which encloses 5 stroke eccentrics 65 on the shaft 14. With a presser foot 66 interacts with its right-hand end from the housing of the valve protrudes and there one with a belt that is fastened by a bolt 67 to one on the lower pulley combined handwheel carries. Ren end of a presser foot bar 69 attached

The stitch-forming devices of the machine around the shaft 68 is articulated. The presser foot bar is in grasp a needle 16 at the end of an up and down bushings 70 slidably mounted by the head walking needle bar 17 carried in bearings at 19 13 of the overhanging arm, and in the overhanging arm articulated arm 18 carries a ring 71 on which a spring 72 rests, is stored. A pin extending horizontally from arm 18 engages the upper end of this spring the leg 20 carries at the free end a ball threaded part 73, which is used to adjust the spring pin 21 (Fig. 1), which with a spherical cap on 15 prestressing a knurled part74 as a handle upper end of a link 22 cooperates. Am wearing. For moving the sewing material in the area The lower end of the handlebar 22 has a further ball of the stitch formation for the purpose of locking the The dome, with a ball stud 23 of a swinging seam, can completely remove the presser foot from the material to be sewn member 24 cooperates. The oscillating link pivots to be lifted off. The lifting mechanism includes to a support bolt 25, which in console plates 26 20 a pin 75 on the ring 71, which with a handlebar is mounted in the vertical stand 11. One in the 76 of an angle lever 77 (Fig. 1 and 2) together-console plates 26 mounted shaft 27 contributes an effect. Between pin 75 and handlebar 76 is in front of the gear 28, which with a pinion 29 on the main preferably has a certain amount of play so that itself wave 14 combs. The transmission ratio between the presser foot bar in normal sewing is over see gear wheel 28 and pinion 29 gives the shaft 35 different material thicknesses to raise and lower 27 half the speed of shaft 14. One on which can lower. An arm 78 of the bell crank 77 is Shaft 27 arranged eccentric is connected by a rod 79 with a plate 81, bifurcated approach of the oscillating member 24, which is attached to the back on an oscillating shaft 82. The lever and reciprocation of the needle bar caused by- 77 is normalized by a spring 80 against the closed. 30 pressed clockwise (Fig. 1). To lift the

For the up and down movement of the needle bar presser foot by pivoting the shaft 82, can

the shaft 14 carries a crank 30 which, as in FIG. 2 is shown on the back

Connecting rod 31 carry a vertical stand 11 swiveling around a pin 33 and an arm 83,

lowing lever 32 drives. The end of the lever 32 which is connected in a known manner with a toggle lever

is bound by a handlebar 34 to one of the needle 35.

rod 17 attached block 35 articulated. If the knife gate valve is below the

A gripper 36 interacts with the needle, which is the surface of the machine, the presser foot is through

is attached to the upper end of an arm 37 which presses the spring 72 against the throat plate 84,

by a screw bolt 38 articulated with a The essential parts of the new spreader mechanism

lateral projection 39a of a nism on the oscillating shaft 40 are shown in FIG. The spreader

40 arranged bushing 39 is attached. As on the mechanism comprises a spreader rod 97, which on

best of fig. 4 as can be seen, the free end of the shaft 40 carries a hook in the area of the stitch formation

an arm 41 which is articulated on a rod 42 carries 98. The rod 97 is axially displaceable and

with a bearing shell an eccentric 43 on the rotatably mounted in a pivot pin 99, the

Enclosing shaft 14. The shaft 40 issued via this 45 by a screw 101 attached to the housing

Connections to the gripper 36, the needle-evading console 100 is carried. The spreader bar

Move. Loop capturing and throwing extends, as in FIG. 1 is shown in

movements are prevented by a connection essentially horizontally with a small distance from the gripper.

extension bar 44 granted with a split bearing half of the fabric support plate84a of the machine. Singles-

45 a side extending from the arm 37- 50 units of the pin 99 and the bracket 100 are shown in FIG

the ball stud 46 encloses. With a split F i g. 9 and 10 shown. The one used to attach the

Bearing 47 at the other end encloses the connecting bracket 100 on screws 101 serving on the housing

Extension rod 44 has a ball stud 48, which are guided through slots 102 of the console and into

borrowed from one attached to the oscillating shaft 50 screwed the housing. The slots 102 allow

Arm49 extends. The oscillating shaft 50 carries a 55 th the correct setting of the console to the

Arm 51 with a ball pivot, which is a ball housing, about the axis of the pivot in the

dome encloses a rod 52 at the lower end. desired location to bring. The pin 99 is from

The upper end of this rod carries a bearing that extends through an opening 103 in the bracket 100 below

with a spherical crank 53 of the shaft 14 used. Flange-

cooperates. 60 segments 104, between which a slideway 105

A material slide in which the rod 97 can slide is used to advance the material to be sewn. That

About 54 (Fig. 2), which by means of a screw 55 on a part 99 attaches itself with a collar 106 against the

Knife pusher rod 56 is attached to a front underside of the console 100. The collar and the

thrust rocker 57 is articulated. This feed main part 99 are provided with a sliding guide 107 for the

Swing arm 57 is attached to a swing shaft 58 65 rod 97 is provided. Part 99 is made by the

and carries a laterally extending pin rod 97 rotatably supported in the console, and the

59, onto which an arm 60 is clamped (FIG. 6). Rod 97 can move the part 99 during its longitudinal

The end of this arm is free to rotate on a rod 61. The flange segments 104

Claims (1)

5 6 give the part 99 a perfect storage for different thread retained by the hook 98 the rotary motion, and the triangle formed between the segments trummen occurs. In Fig. 17 is 104 formed sliding surface 105 allows pivoting the needle in its lowest position, in which the previous ken of the rod 97 between the segments 104. passing needle thread hanging on the hook The right end of the rod 97 (Fig. 6) is released with 5 loop. The spreader hook 98 has a part 108 firmly connected, which is shown in FIG. 5 is moved to the left in order to show the previously inverted position. Screws 109 are to be inserted into rod 97 through slits 110 in the various threads held free-part 108. From the position in FIG. 17 moves screwed to connect the two parts. The hook in the position according to FIG. 12. The hook slots 110 allow a slight adjustment of the io 98 is according to FIG. 12 is withdrawn and the needle rod 97 in the longitudinal direction with respect to the part is at the beginning of the upward movement of its right 108. The part 108 has a cylindrical sideways path. In Fig. 13 the gripper detected on on average 111, with a einge- eccentrically in a its way to the left viewing the patch from the needle eye to the shaft 114 pulley 113 to the workpiece extending needle thread loop, threaded pin 112 cooperates (F i g. 3). On 15 In F i g. 14, the looper has moved further to the left, the shaft 114 is a screw or worm wheel attached to the needle up and the hook to the right 115 , which moves with a screw or thread to the worm wheel 116 on the main shaft 14 combs. Position according to FIG. 15 bring. F i g. 15 shows the shaft 114 runs at the same speed as the needle in its uppermost reverse position,
the shaft 14. 20 FIG. 11 corresponds approximately to FIG. 16, but at In Fig. 18, the layers are illustrated which fed reversed fabric. As can be seen, the gripper 36 and the spreader rod 97 are formed with their, also in this feed direction, a perfect hook 98 at various points in the cycle of the thread triangle at the point of entry of the needle. Instead of taking machines to one another. As shown, the hook can be used in the same way needle 16 is in the various representations 25 in sewing machines, one marked by crosses. In Fig. 18 (e) are the two straight lines of a two-thread chain stitch on the different paths of the needle at a zigzag point. Zack sewing machine marked by two crosses. Like F i g. 7 also shows the application of a, illustrated by arrows, the spreader in the spreader mechanism in a two-needle machine moves an elliptical path in such a way out of phase with a single looper. The needles 16 a and 166 grippers that both are in relation to the needle path in a plane perpendicular to the line of the fabric move in opposite directions. Feed side by side. The gripper 36 a moves According to FIG. 18 (α), the needle 16 is in the deepest position in the same way as the looper 36 and detects the position of its path, while the looper 36 is in the needle thread loops of both needles during the right reversal position. The hook 98 35 of the spreader hook 98, one of the looper thread 117, is on the back of the needle track and the blade of the looper blade and both loops 118 and 119 of the looper. In position (b) the needle is in which the triangle formed by the needle thread extends.
In the middle of its upward movement and the looper is Fig. 8 finally shows the interaction of entered the needle thread loop. The hook 98, two needles, two hooks and two spreader hooks, has moved forward at the same time in front of the needle and 40 in the formation of two separate, straight, two hooks around which the material to be sewn to the thread chain stitches. The two needles 16 c and looper point extending looper thread and the 16 a * move diagonally in a vertical plane to grasp both strands of the needle thread loop. to the line of the material feed. The needle 16 c is in the position (c), the needle bar is arranged in the upper slightly in front of and slightly to the left of the needle 16 d , and the looper is in the left reverse position. The two grippers 366 and 36 c are in a sol-hook of the spreader during this time the chen position is attached to the looper carrier that they work together with strands of the looper thread and the needle thread needles 16 c and 16 d . When the loop is detected and to the right of the needle track of this construction, the spreader bar is pushed with two. In position (d), the needle in the middle hook 98 is provided c & and 98, of which the first of its downward movement and the gripper has 50 serves, 16 c and Greinach moves the yarn of the needle in front and to the right. As shown, fers 36 & has to take up and spread out in order to form a triangle between the looper blade, the desired triangle, while the hook 98 c strands of the looper thread and the two strands of the thread of the looper 36 c and the needle 16 d Needle thread loop formed. The position (e) is taken from and for the formation of the desired triangle speaks approximately the position (d) with a zigzag 55 spreads out. When the needle bar continues to move, the sewing machine kicks in. The needle enters at the one or the needle 16 c in the formed by the hook 98 and the other of the marked points in the kept open triangle, while the needle 16 a "tene in the triangle thread triangle, a. Occurs that the hook 98 c is formed. In Fig. 12-17 is the relationship between the spreader hooks in the fabric construction, needle 16, looper 36 and FIG. 60. 7 and 8 are spreader bars similar to spreader hooks 98 in different positions of one of the rod 97 according to FIG. 9 worn, and this Stan cycle of a two-thread chain stitch zigzag is shown in diagrammatic form reciprocating and rotating sewing machine. According to FIG. 15 movements, as in connection with the rod 97, the gripper is in the left reverse position. Which has been previously described.
Hook 98 holds the strand of the looper thread, which is 65 extends from the sewing material to the gripper and the two claims: Trumbles of the needle thread loop. F i g. 16 shows how chain stitch sewing machine is used for sewing in opposite the needle in that of the looper blade and the gradual directions with one in one plane parallel to the fabric support plate and moved below it to form a thread triangle Needle thread loop, looper thread and looper blade serving spreader, characterized in that that the spreader in an elliptical orbit so out of phase with the Gripper is controlled that the spreader head in Moved in opposite directions to the gripper with respect to the needle track. Considered publications: German Patent Specifications No. 854 875, 820 670, 614, 483 989, 416 426, 346 044; U.S. Patent No. 2792797. For this purpose 2 sheets of drawings 509 659/153 8.65 © Bundesdruckerei Berlin