CA1260321A - Thread loop taker device of a zigzag sewing machine - Google Patents
Thread loop taker device of a zigzag sewing machineInfo
- Publication number
- CA1260321A CA1260321A CA000563963A CA563963A CA1260321A CA 1260321 A CA1260321 A CA 1260321A CA 000563963 A CA000563963 A CA 000563963A CA 563963 A CA563963 A CA 563963A CA 1260321 A CA1260321 A CA 1260321A
- Authority
- CA
- Canada
- Prior art keywords
- race
- needle
- loop taker
- thread loop
- sewing machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000009958 sewing Methods 0.000 title claims abstract description 14
- 210000003323 beak Anatomy 0.000 claims description 12
- 230000004044 response Effects 0.000 claims description 4
- 241000282472 Canis lupus familiaris Species 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Sewing Machines And Sewing (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a zigzag sewing machine, the present invention is to make a loop hooking condition constant as possible as could, irrespectively of needle dropping positions, so that zigzag stitchings of large width may be provided without causing skipping or breaking a thread in large wide zigzag stitchings.
In a zigzag sewing machine, the present invention is to make a loop hooking condition constant as possible as could, irrespectively of needle dropping positions, so that zigzag stitchings of large width may be provided without causing skipping or breaking a thread in large wide zigzag stitchings.
Description
This application is a division of application Serial No. 474,645 filed February 19, 1985.
This invention relates to a thread loop taker device of a zigzag sewing machine which may produce many kinds of pattern stitchings.
An object of the present invention is to make the loop hooking condition constant as possible as could in the zigzag sewing machine, respectively of the needle dropping positions, so that zigzag stitchings of large width may be provided without causing skipping or breaking the thread as con-ventionally happening in the large wide zigzag stitchings.
In accordance with the invention there is provided a thread loop taker device for a zigzag sewing machine having a vertically movable needle which forms a thread loop thereunder. The device includes a bobbin carrier and a rotatable race for non-rotatably holding the bobbin carrier. Also provided is a loop taker having an end portion shaped as a beak and being rotatable -toge-ther with the race and being rotatable relative to the race into a plurality of posi-tions relative to the race. Drive means rotate the end portion through at least one of the positions in response to a change in the position of the needle so that the end portion hooks the tread loop. The drive means include a hollow shaft having a first pin projecting perpendicularly therefrom, a cylindrical shaft concentric to the hollow shaft and having a second pin projecting perpendicularly there-from, and a slide collar mounted concentric to the hollow shaft and the cylindrical shaft and having an oblong groove and an oblique groove cooperating with the first pin and the second pin respec-tively.
Further, in accordance with the invention, there is provided a thread loop taker device for a zigzag sewing machine which includes a needle variably positioned by electronically stored data that cooperates with the -thread loop taker so as -to produce zigzag swi-tches. The loop taker device includes a bobbin carrier and a rotational cylindrical member for supporting -the bobbin carrier therein. Also provided is a loop taker coaxial with and mounted outside the cylindrical member for rotation therewith, the loop taker having one end and an opposite end and also having a beak extending from the one end and in a direction of the rotation around a portion of the cylindrical member for catching a thread loop formed by the needle. A cam means engage the opposite end of the loop taker for rotating the beak relative to the cylindrical member. Means are provided for actuating the loop taker, the means including a pulse motor drivable in response to a change in the position of the needle. Also provided are means for transmitting the drive of the pulse motor to move the cam means so that the beak rotates relative to the cylindrical member in response to a change in the position of the needle during rotation of the cylindrical member.
Fig. 1 is views showing crossings of a needle and a beak of a loop taker in the prior art;
Figs. 2 and 3 are perspective views of the present inventioni Fig. 4 is a side view, partially in section, of the present inven-tion;
Fig. 5 is a plan view, partially in section, of the present invention;
Figs. 6 and 7 are a second embodiment of the present invention, and Fig. 6 is a side vieT~7, partially in section, and Fig. 7 is a perspective view of an element part thereof; and Fig. 8 is a side view, partially in section, of a third embodiment of the present invention.
In a conventional zigzag sewing machine, if a needle dropping position is different as shown in Fig. 1 as in a left basic line (L), a middle basic line (M) and a right basic line (R), crossing conditions between a needle 1 and a beak 2 of a loop taker are differed respectively, differently from straight stitching sewing machines. If a size of a thread loop of the middle basic line (M) is made proper, the crossing conditions are worst at the remotest needle dropping positions of the left (L) and the right (R). A loop of the upper thread is too large in -the lef-t (L), and the loop is too small in the right (R). Thus, the conditions are contrary each other, and hooking of the thread loop is difficult in each of the needle dropping positions to cause skipping on breaking the -thread.
In order to improve such crossing conditions, it was proposed to make -the vertical movement of the needle slow when hooking the thread loop, or make fast speed of rotational movement of the loop taker for removing causes of skipping or breaking the thread. Unfortunately, such ideas have not been yet commercialized.
A thread loop taker device of a zigzag sewing machine by the presen-t invention has removed defects of the prior art, and devised so that it may be also worked in electronic control sewing machines and pattern cam control sewing machines which memorize data of needle positions for stitching patterns.
3~ ~
Explanations will be made to embodiments of the invention.
In the attached drawings, a reference numeral 3 designates a race of a full rotation type, and it is arranged with a loop taker 15 having a sharp beak 2 which is positioned at an appropriate place of -the outer circumferential wall of a cylindrical shape thereof, and is charged therein with a bobbin carrier 4 which is restrained in rotation and carries a bobbin. Above the race 3 and the bobbin carrier 4, a needle plate 6 is furnished, which is detachably secured to a machine frame of a bed of a sewing machine as seen in Fig. 2. The needle plate 6 is defined with a needle drop hole 7 of a large width for passing a needle 1 and openings 9 for raising and dropping feed dogs 8.
The race 3 is secured integrally with a hollow shaft 11 which is formed with a screw gear 10 on a rotation axial line (see Fig. 4). A numeral 12 designates a shaft which rotatably holds the race 3, and the screw gear 10 is in mesh with a screw gear 14 firmly mounted on a drive shaft 13 and is driven by a motor (not shown).
The beak 2 is formed at the end portion of a perpendicular part bent upwardly of the loop taker 15 which is rotatably pivoted on the shaft 12 of the race 3. The loop taker 15 has a spring 19 at its appropriate part, so that its other end attaches to ~ the side of a cam plate 18 mounted on a rotation shaft 17 of a driving element 16 such as a pulse motor which is provided on the lower surface of the bottom of the race 3.
The numeral 20 designates a non-conductive cylindrical body which is secured on the hollow shaft 11 as one body with the race 3, and its outer cir-cumference is provided with a plurality of conductivemembers, each of which is connected to a maynetic field coil and to a power source brush 21.
A second embodiment of the invention is provided with a cylindrical shaft 22 at a fitting part with the hollow shaft 11 of the loop taker 15, and is implanted with a pin 23 projecting from the shaft 22 perpendicularly. The cylindrical shaft 22 is mounted, on its outer circumference, with a slide collar 27.
The collar is formed with an oblique groove 24 for the pin 23 in its half upper part as well as an oblong groove 26 for a pin 25 projecting from the hollow shaft 11 in its half lower part, thereby to move the shaft 11 vertically, and is formed with a lateral groove 28 for an end portion 31 of a fork lever 30 which is driven by a driving element 29 such as a pulse motor positioned at an appropriate part of the machine frame.
A third embodiment of the invention is shown in Fig. 8. A shaft 32 supports the race 3, and is driven by a driving element 33 such as a pulse motor via gears 34, 35. The race 3 is provided with a gear 36 therewithin for meshing with a gear 37 on which a cam plate 18 is provided coaxially, and the cam plate 18 is pressed by the loop taker 15 with its end portion. The driving elements 29, 33 may be substituted by cam members to be rotated.
The device of the invention is composed as mentioned above. When the sewing machine is driven to move the needle vertically and simultaneously the race is rotated, needle amplitude data of pattern stitching are taken out from a data memory and the needle is moved laterally to produce patterns. At this time, v~
said needle amplitude data are input into the driving element 16, 29 or 33 to be driven by angular amounts required respectively.
The rota-tion of said driving elements alters relative posi-tions in a rotating direction between the loop taker 15 and the race 3 during rotation of the race 3 in order to alter phases of the loop taker 15 via rotation of the cam plate 18 or movement of the oblique groove 24, so that the beak 2 crosses with the needle 1 at time when the needle 1 moves upwardly by ~M under the same condition as -the needle crossing in a middle basic line (M), though in a left basic line (L) and a right basic line (R).
With respect to the crossing condition of the needle and the beak~ the loop taker is moved forward or backward relatively with the race via the driving element by the pattern stitching needle amplitude data taken out from the data memory. The beak 2 crosses with the needle by the same amount ~ of the needle rising as the amount ~ M of the middle basic line (M) even if it is in any position, and therefore the thread loop may be exactly caught without skipping or breaking the thread.
This invention relates to a thread loop taker device of a zigzag sewing machine which may produce many kinds of pattern stitchings.
An object of the present invention is to make the loop hooking condition constant as possible as could in the zigzag sewing machine, respectively of the needle dropping positions, so that zigzag stitchings of large width may be provided without causing skipping or breaking the thread as con-ventionally happening in the large wide zigzag stitchings.
In accordance with the invention there is provided a thread loop taker device for a zigzag sewing machine having a vertically movable needle which forms a thread loop thereunder. The device includes a bobbin carrier and a rotatable race for non-rotatably holding the bobbin carrier. Also provided is a loop taker having an end portion shaped as a beak and being rotatable -toge-ther with the race and being rotatable relative to the race into a plurality of posi-tions relative to the race. Drive means rotate the end portion through at least one of the positions in response to a change in the position of the needle so that the end portion hooks the tread loop. The drive means include a hollow shaft having a first pin projecting perpendicularly therefrom, a cylindrical shaft concentric to the hollow shaft and having a second pin projecting perpendicularly there-from, and a slide collar mounted concentric to the hollow shaft and the cylindrical shaft and having an oblong groove and an oblique groove cooperating with the first pin and the second pin respec-tively.
Further, in accordance with the invention, there is provided a thread loop taker device for a zigzag sewing machine which includes a needle variably positioned by electronically stored data that cooperates with the -thread loop taker so as -to produce zigzag swi-tches. The loop taker device includes a bobbin carrier and a rotational cylindrical member for supporting -the bobbin carrier therein. Also provided is a loop taker coaxial with and mounted outside the cylindrical member for rotation therewith, the loop taker having one end and an opposite end and also having a beak extending from the one end and in a direction of the rotation around a portion of the cylindrical member for catching a thread loop formed by the needle. A cam means engage the opposite end of the loop taker for rotating the beak relative to the cylindrical member. Means are provided for actuating the loop taker, the means including a pulse motor drivable in response to a change in the position of the needle. Also provided are means for transmitting the drive of the pulse motor to move the cam means so that the beak rotates relative to the cylindrical member in response to a change in the position of the needle during rotation of the cylindrical member.
Fig. 1 is views showing crossings of a needle and a beak of a loop taker in the prior art;
Figs. 2 and 3 are perspective views of the present inventioni Fig. 4 is a side view, partially in section, of the present inven-tion;
Fig. 5 is a plan view, partially in section, of the present invention;
Figs. 6 and 7 are a second embodiment of the present invention, and Fig. 6 is a side vieT~7, partially in section, and Fig. 7 is a perspective view of an element part thereof; and Fig. 8 is a side view, partially in section, of a third embodiment of the present invention.
In a conventional zigzag sewing machine, if a needle dropping position is different as shown in Fig. 1 as in a left basic line (L), a middle basic line (M) and a right basic line (R), crossing conditions between a needle 1 and a beak 2 of a loop taker are differed respectively, differently from straight stitching sewing machines. If a size of a thread loop of the middle basic line (M) is made proper, the crossing conditions are worst at the remotest needle dropping positions of the left (L) and the right (R). A loop of the upper thread is too large in -the lef-t (L), and the loop is too small in the right (R). Thus, the conditions are contrary each other, and hooking of the thread loop is difficult in each of the needle dropping positions to cause skipping on breaking the -thread.
In order to improve such crossing conditions, it was proposed to make -the vertical movement of the needle slow when hooking the thread loop, or make fast speed of rotational movement of the loop taker for removing causes of skipping or breaking the thread. Unfortunately, such ideas have not been yet commercialized.
A thread loop taker device of a zigzag sewing machine by the presen-t invention has removed defects of the prior art, and devised so that it may be also worked in electronic control sewing machines and pattern cam control sewing machines which memorize data of needle positions for stitching patterns.
3~ ~
Explanations will be made to embodiments of the invention.
In the attached drawings, a reference numeral 3 designates a race of a full rotation type, and it is arranged with a loop taker 15 having a sharp beak 2 which is positioned at an appropriate place of -the outer circumferential wall of a cylindrical shape thereof, and is charged therein with a bobbin carrier 4 which is restrained in rotation and carries a bobbin. Above the race 3 and the bobbin carrier 4, a needle plate 6 is furnished, which is detachably secured to a machine frame of a bed of a sewing machine as seen in Fig. 2. The needle plate 6 is defined with a needle drop hole 7 of a large width for passing a needle 1 and openings 9 for raising and dropping feed dogs 8.
The race 3 is secured integrally with a hollow shaft 11 which is formed with a screw gear 10 on a rotation axial line (see Fig. 4). A numeral 12 designates a shaft which rotatably holds the race 3, and the screw gear 10 is in mesh with a screw gear 14 firmly mounted on a drive shaft 13 and is driven by a motor (not shown).
The beak 2 is formed at the end portion of a perpendicular part bent upwardly of the loop taker 15 which is rotatably pivoted on the shaft 12 of the race 3. The loop taker 15 has a spring 19 at its appropriate part, so that its other end attaches to ~ the side of a cam plate 18 mounted on a rotation shaft 17 of a driving element 16 such as a pulse motor which is provided on the lower surface of the bottom of the race 3.
The numeral 20 designates a non-conductive cylindrical body which is secured on the hollow shaft 11 as one body with the race 3, and its outer cir-cumference is provided with a plurality of conductivemembers, each of which is connected to a maynetic field coil and to a power source brush 21.
A second embodiment of the invention is provided with a cylindrical shaft 22 at a fitting part with the hollow shaft 11 of the loop taker 15, and is implanted with a pin 23 projecting from the shaft 22 perpendicularly. The cylindrical shaft 22 is mounted, on its outer circumference, with a slide collar 27.
The collar is formed with an oblique groove 24 for the pin 23 in its half upper part as well as an oblong groove 26 for a pin 25 projecting from the hollow shaft 11 in its half lower part, thereby to move the shaft 11 vertically, and is formed with a lateral groove 28 for an end portion 31 of a fork lever 30 which is driven by a driving element 29 such as a pulse motor positioned at an appropriate part of the machine frame.
A third embodiment of the invention is shown in Fig. 8. A shaft 32 supports the race 3, and is driven by a driving element 33 such as a pulse motor via gears 34, 35. The race 3 is provided with a gear 36 therewithin for meshing with a gear 37 on which a cam plate 18 is provided coaxially, and the cam plate 18 is pressed by the loop taker 15 with its end portion. The driving elements 29, 33 may be substituted by cam members to be rotated.
The device of the invention is composed as mentioned above. When the sewing machine is driven to move the needle vertically and simultaneously the race is rotated, needle amplitude data of pattern stitching are taken out from a data memory and the needle is moved laterally to produce patterns. At this time, v~
said needle amplitude data are input into the driving element 16, 29 or 33 to be driven by angular amounts required respectively.
The rota-tion of said driving elements alters relative posi-tions in a rotating direction between the loop taker 15 and the race 3 during rotation of the race 3 in order to alter phases of the loop taker 15 via rotation of the cam plate 18 or movement of the oblique groove 24, so that the beak 2 crosses with the needle 1 at time when the needle 1 moves upwardly by ~M under the same condition as -the needle crossing in a middle basic line (M), though in a left basic line (L) and a right basic line (R).
With respect to the crossing condition of the needle and the beak~ the loop taker is moved forward or backward relatively with the race via the driving element by the pattern stitching needle amplitude data taken out from the data memory. The beak 2 crosses with the needle by the same amount ~ of the needle rising as the amount ~ M of the middle basic line (M) even if it is in any position, and therefore the thread loop may be exactly caught without skipping or breaking the thread.
Claims
1. A thread loop taker device for a zigzag sewing machine having a vertically movable needle which forms a thread loop thereunder, the device comprising:
a bobbin carrier;
a rotatable race for non-rotatably holding said bobbin carrier;
a loop taker having an end portion shaped as a beak and being rotatable together with said race and being rotatable relative to said race into a plurality of positions relative to said race; and driving means for rotating said end portion through at least one of said positions in response to a change in the position of the needle so that said end portion hooks the thread loop, said driving means including a hollow shaft having a first pin projecting perpendicularly therefrom, a cylindrical shaft con-centric to said hollow shaft and having a second pin projecting perpendicularly therefrom, and a slide collar mounted concentric to said hollow shaft and said cylindrical shaft and having an oblong groove and an oblique groove cooperating with said first pin and said second pin respectively.
a bobbin carrier;
a rotatable race for non-rotatably holding said bobbin carrier;
a loop taker having an end portion shaped as a beak and being rotatable together with said race and being rotatable relative to said race into a plurality of positions relative to said race; and driving means for rotating said end portion through at least one of said positions in response to a change in the position of the needle so that said end portion hooks the thread loop, said driving means including a hollow shaft having a first pin projecting perpendicularly therefrom, a cylindrical shaft con-centric to said hollow shaft and having a second pin projecting perpendicularly therefrom, and a slide collar mounted concentric to said hollow shaft and said cylindrical shaft and having an oblong groove and an oblique groove cooperating with said first pin and said second pin respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000563963A CA1260321A (en) | 1984-02-20 | 1988-04-12 | Thread loop taker device of a zigzag sewing machine |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59028689A JPS60174174A (en) | 1984-02-20 | 1984-02-20 | Yarn loop catching apparatus of zigzag sewing machine |
| JP28689 | 1984-02-20 | ||
| CA000474645A CA1254798A (en) | 1984-02-20 | 1985-02-19 | Thread loop taker device of a zigzag sewing machine |
| CA000563963A CA1260321A (en) | 1984-02-20 | 1988-04-12 | Thread loop taker device of a zigzag sewing machine |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000474645A Division CA1254798A (en) | 1984-02-20 | 1985-02-19 | Thread loop taker device of a zigzag sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1260321A true CA1260321A (en) | 1989-09-26 |
Family
ID=25670593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000563963A Expired CA1260321A (en) | 1984-02-20 | 1988-04-12 | Thread loop taker device of a zigzag sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1260321A (en) |
-
1988
- 1988-04-12 CA CA000563963A patent/CA1260321A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |