US1000265A - Revolving-hook sewing-machine. - Google Patents

Description

R. K. HOHMANN. REVOLVING HOOK SEWING. MACHINE. APPLIOATI6N FILED ov. 3, 1910.

Patented Aug. 8, 1911.

6 SHEETS-SHEET1.

R. K. 'HOHMANN. REVOLVING HOOK SEWING MACHINE. APPLICATION FILED 11017. 1910.

Patented Aug. 8, 1911. 1

5 SHEETS-SHEET 2.

R.' K. HOHMANN. REVOLVING HOOK SEWING MACHINE.

APPLIOATION FILED NOV. 3, 1910.

Patented Au 8, 1911.

5 SHEETS-SHEET 3.

R. K. HOHMANN. REVOLVING HOOK SEWING MACHINE. APPLICATION FILED NOV. 3, 1910.

5 SHEETS-SHEET 4.

Patented Aug. 8, 1911.

R.'K. HOH'MANN. REVOLVING HOOK SEWING MACHINE.

APPLICATION FILED NOV. 3, 1910.

. 1,0 0,2 5 Patented Aug. 8, 1911.

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UNITED STATES PATENT came RICHARD K. HoHMANN, or SANY'DIEGO, CALIFORNIA, assrenoa or ONE-HALF 'ro PERLE M. JOHNSON, OF- SAN DIEGO, CALIFORNIA.

REVOLVING-HOOK snwin'-macnmn.

Specification of Letters Patent;

Patented Au 8,1911.

To all whom it may concern: v 1

Be it known that I, RICHARD K. HoH- warm. a citizen, of the United States, and resident of San Diego, in the county of San Diego and State of California, have invented certain new and useful Impro ements in Revolving-Hook Sewing-Machines, of which the following is a specification.

This invention relates to revolving hooksewing machines and it has particular reference to the mechanism for holding the spool or bobbin carrying the lower thread and for passing the loop of the upper thread around such spool or bobbin.

One .of my objects has been to make a simple and'eflicient structure by which the loop is passed freely around the holder for the lower bobbin or spool so that the machine may be run at a very high speed with- .out any tangling or binding of the loop evenwhere an ordinary size spool of thread is used in the bobbin holder. I

Other objects and advantages of the 1nvention will .be apparent from the consid-' eration of the following description in connection with the accompanying drawings.

In the drawings,Figure 1 is a bottom plan view of a device embodying my invention; Fig. 2 is an end v ew, parts of the sewing machine being omitted; Fig. 3 1s a longitudinal section through the bobbin holder and associated mechanism takenon the line- 33 of Fig. 2; Fig. 1 1s a detail perspective view of the parts of the bobbin holder separated; Fig. 5 is a'detail perspective view of one of the retaining arms for the bobbin holder; Fig. 6 is an enlarged view of the end of the rotary. shaft and attached parts; Fig. 7 is a side view of the .frame which carries the shuttle with parts a sewing machine and 2irepreeents the head removed; Fig. 8 is a detailed viewof the guide plate and finger; Fig. 9 is an end view of the casting which carries. the operat1ng parts; Fig. 10 is a perspective view of the shuttle holder showing the tension mechanism; Fig. 11 is an end view showing a modification; Fig. 12 is a side View of the modified construction; Fig. 13 is a top view showing detached another modification; Fig. 14 is a side view of, the form shown in Fig. 13.

In thedrawings, 1 represents the table of carrying the needle bar and prsser foot.

ring 16 facing in the opposite The needle bar 3 and presser foot 4 are of the usual construction and the upper threa 5 may be carried and operated in any ordinary manner, so far as the present-invention in concerned, so long asthe take up is sufiicient to draw the loop tight after it has passed around the bobbin holder.

Below the table 1, I make use of av rotary shaft 6 which is mounted in bearings parallel to the table, oneof these bearings being shown in Fig. 3 as formed in the lug 7 on the casting 8, secured toithc table-1. The shaft 6 has an enlarged cylindrical portion 9 immediately in front of the lug 7 and this cylindrical portion has in it the circumferential cam groove 10 for a purposehereafter. described. On the forward end of the shaft the outwardly inclined arms 11 and 12 are formed, and they carry at their outer ends the ring-13 This ring hason its outer surface a pin- I l-which fits in a slot 15 in the revolving hook ring 16. It is also provided with screw threaded apertures which receive the screws 17 which pass through the ring 16 to hold it in place. The shaft 6 and the parts carried by it are rotated in the usual way being driven from the driving mechanism of the sewing. machine. The casting.8 has formed thereona ring 18 surrounding the cylindrical portion 9 andarms 19, 20 extend from this ring forward and outwardly to an enlarged ring 21 which closely surrounds the ring 13 and the revolving hook ring 16. It should be understood that while the ring 16 fits within the ring 21 it is not in contact with it and does not furnish a bearing for it. A frame 88 for carrying the bobbin holder 29 is shown in Fig. 4 and it fits within the ring 16 and against the edge of the ring 13, a shoulder 56 being provided on the ring 16 for holding it in place. This frame has a bearing surface 23 semi-circular in form and oneend is sharpened at 24 to form a point or hook to engage the loop of thread. "This'hook cooperates with'the hook 25 formed on the irection so that when the two hooks pass each other the. loop of thread will be caught and spread around the bobbin carrier as hereafter do.-

scribed. The hook-25 is formed on the edge of the ring 16 and the portion'of the ring immediately in advance of it is cut away at 26 and in addition to this the metal con-- stitutingjhe hook is cut away ontheouter I side to a certain extent at the point 27 so as in the frame.

to leave room on the outer side of this hook between it and the margin of thering for the free passage (f the thread. The frame for receiving the bobbin holder is cut away for something over one fourth of its circumference, and the ends of the semi-circular portion are joined by the arm 28 which is curved at the upper end immediately below the hook 2 4, as shown. The cylindrical 'spool or bobbin holder 29 fits within this frame 88, one side being immediately adjacent the arm 28, and parallel therewith. This bobbin holder has on its outer surface the tension plate 3Q and a lug 31 in line with each other, the edge of the plate and the lug being adapted to come in contact with the arm 28 when the holder is placed in position. The opposite side of the holder has a strip 32 cut therefrom and bent atright angles'to form an elbow 33, as shown, this elbow resting againstthe lug 34 on the frame when the device is in position. In line with the elbow there is also a lug 35 at the opposite end which strikes against theshoulder36 to properly position the holder A small spring 37 projects from the shoulder 36 over the lug 35 so as to releasably hold the parts in position. A spring 38 is also carried on the frame and bears against the lower end of the holder 29, the curved portion of this spring entering a small depression 73 in the'end of the holder to yieldingly retain it in position. The frame 88 has at its upper portion the curved arms 39, 40 and the straight arms 42 and 43 forming frames extending over the open upper end of the bobbin holder to serve as shields. A curved arm 44 projects from the frame 88 on its rear side so as to bear against the surface of the bobbin holder 29 when it is pushed in position. and

, it thus limits the inward movement of the holder.

Since the holder lies close to the arm 28 I cut away a portion of that arm between the points 45, 46 so asto permit the easy passage of the thread between the holderv and the arm. In order to permit the easy removal of the holder and at the same time lessen its weight, I provide the hole 47 in such posi ion that it may be engaged by the finger of the operator so as to turn the holder and release it from the spring 37.

The holder is provided with a central shaft,

50 and from that point it is carried beneath the: lowenend of. the tension plate 51 tlu'jt ugh the slot into the eye 52, and from there it passes over the end of the holder around the roller 53 which is loosely mounted in the lower end of the hollow shaft 48.

The thread is wrapped one full'turn around this roller and is then brought back over the edge of the holder, thus making almost two turns around the roller, and it is then carried up through the eye 54 in the upper end of the tension plate. This roller with the other parts mentioned constitutes an autoinatic tension device which always keeps the thread; tight while permitting it to be withdrawn as desired, and it is equally effective without regard to the 'size of the thread which is used.

It will be observed by reference to Fig. 4 that a portion of the forward edge of the revolving hook ring 16 between the point 55 and the hook 25 is cut away to allow for the passage of the thread along this portion of the ring. The ring itself has on its inner surface a shoulder 56 whichfits against the ring 13, thus holding the parts in position and holding the bearing surface 23 of the frame 88 in place. The ring 13 and the revolving'hook ring 16 of course revolve with the revolving shaft-J 6, and they would by arms 57, 58 of the particular form shown in Fig. 5, these arms being mounted in slots in the arms 19 and 20 of the casting 8. These arms have at their rear ends a reducedpon tion 59 which passes through the opening 60 so as to properly guide the arms in their forward and backward motion. .Each arm has at its forward end an inwardly projecting portion 61 which may be formed with or attached to the arm in any suitable man ner, it being shown in Fig. 5 as attached by a screw. This projection has a pin 62, extending inwardly in the line of the motion of the arm and adapted to enter an opening 63 in the frame 88 which carries the spool holder. The arms 57 and 58am alike, and while the finger on one enters the opening 63, the finger on the other enters opening 64.

Each arm has near its rear end a roller working in the cam groove 10 in the cylindrical portion 9 of the rotary shaft, and the shape of the cam groove and the position of the arms around its surface are such that one of the pins 62 will always be held in the the thread reaches that arm. By this means the thread holder is prevented from'rotating and at the same time no obstruction whatever is presented to the free passage of the loop of thread around it. In order to prevent any accidental engagement by the loop of thread with the end of the pin 62, I secure to the face of the ring 21 a plate 66 by means of screws passing through the openings 67, 68 and 69. On this plate I place a curved finger 70 which is placed immediately adjacent the end of the arm 57 so that it will guide and retain the loop so as to prevent it from accidentally extending out so as to catch on the pin 62. The outer surface of the plate is cut away at 71 and 72 to permit the passage of the two arms.

The purpose of extending the plate 66 around the ring 21 over the arms 57 and 58 is to serve. as a retaining member to guide those arms at their forward ends and prevent them from coming in contact with the revolving hook 16. The curved finger 70 is not absolutely necessary, but I find that it assists in the free operation of the-device when placed adjacent the end of that arm which is reached last by the loop of thread as it passes around the holder. At this point the loop is being released and drawn up and is therefore more likely to extend outwardly from the holder.

It will be observed from the above description of the structure that the cylin drical holder 29 is adapted to contain either an ordinary spool of thread or a bobbin, and that the spool may be easily and quickly inserted through the open end fitting on the shaft- 48. The holder itself may be easily and quickly secured in'or removed from the frame 23 in operative position in the ma chine. It is simply snapped into position against the slight tension of springs 37, 38 and is removed by a slight pull by the finger engaged in the opening 47.

In operation a loop of thread formed by the descent of the needle is engaged by'the hook'25 and is carried forward by that hook past the stationary hook 24, and is engaged thereby. One side of the loop will lie over the top of the hook 25 extending along the cut-away portion at the point 27 until the hook moves some distance and reaches its lower position when it will travel up' over the guard arm 39 and the strip 82 and thus pass over the holder 29. The other end of the loop passes up the guard aria -10 and the arm 4-1 and thus guided over the holder. After the loop has traveled something over half the revolution of the hook it is released and may be drawn tight by the take up. As the hook 25 approaches each arm 57, 58 that arm is moved forward by the action of the cam groove 10 so that its pin is disengaged from the frame'88 so as topermit the free passage of the thread by that arm. The arm is moved back into position as soon as the thread passes, andbefore it-reaches the next arm.

while I have. shown and described one form of device embodying my invention it will be understood that its principles are applicable to other forms and that I do not limit myself to the precise construction shown. In the particular form hown how ever I have found that the machine may be successfully run at a speed of two thousand revolutions per minute. Instead of using the longitudinally sliding arms 57 and 58 for holding the shuttle frame against rotation, I may make use of the modified construction shown in Figs. 11. and

'12. In this instance a shaft 90 is rotatively 8 mounted in the casting 8 parallel with the direction of the rotary shaft 6 and at the rear end of this shaft there is secured a forked arm 74 which embraces the cam 75 which rotates with the rotary shaft. On

the opposite end of the shaft 90 is secured a part having two arms 7 6, 77, each arm having at its-end a finger or lug forthe purpose hereafter described. The frame 88 instead of having holes in its side for engagement by the fingers, as shown in Figs. 4 and 7, is provided with afiange 7 8 extending beyond the edge of the rotary hook ringrand this flange has the radial holes 79 89, to reoeive the fingers on the arms and 77. 1

It will be noted that the arms 76 and 77'aire rocked by means of the cam 75 which engages the forked arm and the fingeron one arm will enter one. of the holes in the frame before the finger on the other arm is entirely withdrawn so that the frame is atall times heldagainst rotation. The shape oft-he cam and the consequentoscillation of the arms is such that the fingersare withdrawn just at the time that the loop of thread reaches that point in passing around the holder.

In Figs. 13 and 14 I have shown tii'igers 81, 82, which are adapted tb enter openings- -in the face of the frame corresponding to 63 and 64: shown in Fig. 7, butj-instead. of

sliding these fingers are mounted'upon an oscillating frame 83 pivoted at 84. ,One end of this frame is the upwardly: e ltcnding forked arms 85, 86, which are engaged and operated by a cam surface '87 which maybe .continuously rotated with the rotaryshaft.

This cam surface oscillates the frame 83, thus withdrawing the fingers 81 and .82 succ'essively and the timing is such that they will be withdrawn as the thread approaches them. I

Having thus described the invention, what is claimed is: v

1. Ina device of the classdescribed, the combination with a rotary shaft, of a reedge, and a practically continuous bearing groove on its interior, of a frame constituting a bobbincarrier having a bearing rim fitting in said groove throughout more than half of its circumference and extending I through the bottom quarter of the circumference of said groove, a plurality ofineans' for alternately engaging said'franie within about one quarter of its circumference atthe bottom.

2. In a device of the class described, the combination with a rotary shaft, of a revolving ring, having a hook formed on one edge',-and a practically continuous bearing groove on its interior, of a bobbin holder having a bearing. rim fitting in said groove throughout more than half'of the circumference, and being cut away on one side from a point near the bottom to the top and'ineans for completely taking up the thread at each revolution of the hook the said means constructed to operate as the thread reaches said cut away portion.

3. In a device of the class described, the combination with a revolving hook having a practically continuous interior circular cut away portion.

4. In a device'of the class described,the combination with a revolving hook having a practically continuous interior circular bearing surface, of a bobbin carrier having a rim fitting in said bearing surface cut away on one side from the top to a point near the bottom but leaving abearing-surface throughout the bottom quarter, means for securing a spool or bobbin in said carrier with'its axis centrally of said bearing surface but at a slight inclination to the vertical, and means for preventing the rotation of said carrier while permitting the passage of a loop of thread around it and means for completely taking up the thread at each revolution of the hook the said means constructed to operate as the thread reaches said cut away portion.

5. In a device of the class described, the coml'iination with a revolving hook having a practically continuous interior circular bearing, of a bobbin carrier having a rim fitting in said bearing, saidrim being cut away circumferentially from a point at the top to a point at the side, and, a plurality of pins adapted to engage said carrier within about one quarter of the circumference at the bottom, and means for operating said pins alternately whereby a' loop of thread may pass freely.

' 6. In a device bf the class described, the combination with a bobbin holder having a bearing rim in the arc of a circle, of means for passing a loop of thread around said holder, a plurality of engaging means for holdingsaid bobbinagainst rotation within about one-quarter of the circumference at the bottom, means for disengaging said holding means alternately whereby the loop may pass freely around the holder, and means for completely drawing up said loop to form the stitch before passing a second loop around the holder.

7. In a device of the class described, the combination with a bobbin holder, of a rotary shaft in line therewith, divergent arms on the end of said shaft carrying a revolving hook ring at their outer ends, a frame closely surrounding said arms and ring the said frame being provided 011 .its inner side with two separated longitudinal slots,

7 arms slidably mounted in isaidslots having their outer ends extended around said ring and back toward the same, and cam slot connection between the inner-ends of said slidably mounted arms and rotary shaft.

8. In a device of the class described, the combination with a revolving ring having a hook formed onone edge and a continuyieldingly holding said bobbin holder in place, and means for preventing the rotation of said frame in said bearing groove and for holding it with the continuous portion'. of its bearing throughout the lower quarter of the circumference, I

9. In a device of the class described, the combination with'a bobbin holder, of a rotary shaft in line therewith, divergent arms on the end of said shaft carrying a revolving-hook ring at their outer ends, a frame closely surrounding said arms and ring, the

said frame being provided on its inner side With two separated longitudinal slots, arms slidably mounted in said slots having their outer ends extended around said ring and back toward the same, cam slot connection between the inner ends of said slidably mounted arms and rotary shaft. and a guard ing rim, of a hook on one end of said rim, a cross arm connecting the ends of said rim, a cylindrical bobbin holder fitting in said frame along said arm and having aprojecting part longitudinally thereof abutting against said arm to properly position said holder,-co6perating stops on said frame and on the side of said holder opposite said projecting part, and spring catches between said frame and-holder to retain it in position.

11. In a device of the class described, the combination with a semi-circular ring like supporting frame having an exterior hearing rim, of a hook on one end of said rim, a cross arm connecting the ends of said rim, a cylindrical bobbin holder fitting in said frame along said arm and having a projecting part longitudinally thereof abutting against said arm to properly position said holder, codperat-ing stops on said frame and on the side of said holder opposite said projecting part, and spring catches between said frame and holder to retain it'in position, the said bobbin holder-being centrally arranged in said frame with its axis at right angles to the axis of said bearing rim.

- 12. In a device of g the class described, the combination with a semi-circular ring like supportingframe having an exterior hearing rim, of a hook on one end of'said rim, a cross arm connecting the ends of said rim, the said cross arm forming one side of an opening in said frame adapted to receive a spool holder, stops on said frame adapted to coiiperate with said holder to retain it in position along said cross arm, and guards having' semi-circular outer margins extending at one end from said frame over the end of said opening. a

13. In a device of the class described, the combination with a semi-circular ring-like supporting frame having an exterior bearing rim, of a hook on one end of said rim, a cross arm connecting the ends of said rim, the arm at the'end adjacent the hook-being extended beneath the same in the direction in which it points and then across to the other end of the frame forming an opening therein adapted to receive a bobbin holder rectangular in longitudinal section, and

guards having semi-circular outer margins copiesioi this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

and open at one end, of a post therein-adapted to receive an-ordinary spool or bobbin, a

tension plate extending longitudinally of said holder on one side, stops in line on the opposite side, a frame having an opening,

provided with marginal stops adapted to receive said holder, the said marginal stops therein coiiperating' with said tension plate and stops'on the holder to limit the insertion of the holder, and yielding means for retaining the holder in place.

15. The combination with a cylindrical bobbin holder having a thread slot therein and open at one end, of a post therein adapted to receive an ordinary spool or bobbin, a tension plate extending longitudinally of said holder on one side, stops in line on the opposite side,.a frame havingan opening provided with stops adapted to receive said holder, the said stops therein cooperating with said tension plate and stops on the holder to limit the insertion of the holder, yielding means forretaining the holder in place, and guards on the frame extending over the open end of said holder.

16. In a sewing machine, thecombination with a needle and operating mechanism to form a loop of thread, of. a revolving ring having a hook to engage said loop and a practically continuous circular bearing on its interior, a bobbin holder having a bearing fitting said first mentioned bearing and being cut away circumferentially from the top to a point near the bottom, ahook on said holder facing said cut away portion at the top coiiperating with the hook on said ring to spread the loop, means at the bottom portion of said holder to prevent its rotation, and means for completely taking uthe thread at each revolution of the. hoo the said means constructed to operate as the thread reaches said cut away portion.

In testimony whereof I affix my signature in presence of two witnesses.

RICHARD K. HOHMANN.

Witnesses ARTHUR L. BRYANT, JOHN M. Coir.

Washington, D. C.

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