CA1098379A - Sewing machine - Google Patents
Sewing machineInfo
- Publication number
- CA1098379A CA1098379A CA315,738A CA315738A CA1098379A CA 1098379 A CA1098379 A CA 1098379A CA 315738 A CA315738 A CA 315738A CA 1098379 A CA1098379 A CA 1098379A
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- Canada
- Prior art keywords
- bed
- lockstitching
- arm frame
- needle
- 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.)
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Abstract
ABSTRACT OF THE DISCLOSURE:
A machine body of ]-shape as viewed in front is formed of a bed, an arm frame laterally disposed above the bed, and an upright support uprightly extended form the bed and sup-porting one end of the arm frame at an upper end thereof. An upper mechanism of a lockstitching sewing mechanism is disposed in the free end of the arm frame and a lower mechanism of the lockstitching sewing mechanism is disposed below the upper mechanism within the bed so that cloth may be subjected to lockstitching by these mechanisms. An overedge stitching mechanism is provided in a recess within the ]-shaped body in order to apply overedge to the edge of the cloth.
A machine body of ]-shape as viewed in front is formed of a bed, an arm frame laterally disposed above the bed, and an upright support uprightly extended form the bed and sup-porting one end of the arm frame at an upper end thereof. An upper mechanism of a lockstitching sewing mechanism is disposed in the free end of the arm frame and a lower mechanism of the lockstitching sewing mechanism is disposed below the upper mechanism within the bed so that cloth may be subjected to lockstitching by these mechanisms. An overedge stitching mechanism is provided in a recess within the ]-shaped body in order to apply overedge to the edge of the cloth.
Description
1~98379 This invention relates to a sewing machine for sewing pieces of cloth.
When pieces of cloth are sewn together to make clothing, it is necessary, even in the making of a single article of clothing, to select the way of sewing suitable for a variety of sewing types. That is, for example, when an edge of a piece of cloth is stitched, overedge stitching is employed, and on the other hand, when a plurality of pieces of fabric are sewn together, lockstitching is employed. Because of such stitching requirements, if two sewing machines, one for the lockstitching and the other for the overedge stitching, have ~o be accommodated for example in an ordinary household, it poses a problem that these machines occupy a very large space when they are put in a house-work room.
In addition, when articles of clothing are made in a household, there is often involved the procedure of applying the overedge stitching to a first portion, thereof, thereafter the lockstitching to a second portion, and the overedge stitching to a third portion, and thereafter again the lockstitching thereto. In such case, if an attempt i made to perform sewing using two different sewing machines, the operation, in which an operator leaves one seat and takes the other seat w~ere sewing takes place and thereafter the operator returns to the first seat for sewing, must be repetitiously conducted.
It is therefore an object of the present invention to provide a sewing machine in which two modes of sewing, one for lockstitching and the other for overedge stitching can be achieved by a single sewing machine.
It is a further object of the present invention to provide a sewing machine in which even in the case where the two modes of sewing as described above are alternately carried out, either way of sewing may be immediately conducted by only ,; --1--~Q`'a~379 a slight movement of hand.
It is another ob~ect of the present invention to provide a sewing machine of a compact style externally similar to conventional sewing machines which can merely perform a single way of sewing, despite the fact that the proposed sewing machine may perform two modes of sewing as previously mentioned.
In accordance with the above objects, the invention as herein claimed lies essentially in a sewing machine having a body including: a bed; a support extending upwardly from one end of said bed and an arm frame extending at one end from the upper end of said upright support over and parallel to said bed whereby said body is ~shaped with the free end of said arm lying above the free end of said bed; a lockstitching mechanism including an upper lockstitching means depending from said free end of said arm frame and a lower lockstitching means in said free end of said bed, the improvement in the combination there-with comprising:
means defining a recess in said support at the inner end of said ~shape, said recess opening inwardly of said ~shape toward the free ends of said bed and of said arm frame and extending across said bed; said recess having a top wall facing said bed, and an overedge stitching mechanism including an overedge stitching needle movable up and down from said recess upper wall and a looper proiecting upwardly from said bed to cooperate with said overedge stitching needle within said recess and ~eing lodged therein.
Other objects and advantages of the invention will become apparent during the following description of preferred 3~ embodiments haviny reference to the appended drawings wherein:
Figure 1 is a front view, partly in section, of a sewing machine, according to a first embodiment of the invention;
1~8379 Figure 2 is a side view on the right side;
Figure 3 is a longitudinal sectional view of a selecting mechanism;
Figure 4 is a front view showing the state of the sewing machine in the case of overedge stitching;
Figure S is a side view on the left side, partly in section, showing the state similar to that of Figure 4;
Figure 6 is a plan view showing the state where lockstitching and overedge stitching are alternately carried out;
Figure 7 is an exploded perspective view showing another embodiment;
Figure 8 is a front view, partly in section, showing the state where the overedge stitching is carried out by the sewing machine shown in Figure 7;
Figure 9 is a perspective view of a cloth holding section;
Figure 10 is a perspective view of a cover for covering an overedge stitching mechanism;
Figure 11 is a front view showing the state where the overedge stitching mechanism is covered with the cover; and ~igure 12 is a front view showing the state where an upper mechanism in a lockstitching mechanism is covered by a cover.
Referrlng now to Fig~res 1 through 6, the reference numeral 10 designates a machine frame of the entire sewing machine. This machine frame 10 comprises a bed 11, an upright support 12 uprightly extending from the bed 11, and an arm frame 13 extended parallel with the upper surface of the bed 11 from 3~ the upper end of the upright support 12. The arm frame 13 comprises an arm frame body 14 integral with the upright sup-port 12 and a head 1~ connected to the foremost end of the arm lQ~8379 frame body 14. The head 15 is rotatably mounted on the arm frame body 14. That is, the arm frame body 14 is formed at its foremost end with a bearing hole 16 whereas the head 15 has a shank 17, which is rotatably received in the bearing hole 16.
In a connection between the arm frame body 14 and the head 15, the arm frame body 14 has a projection 18 extended there-from, (Figùre 4), which projection 18 threadedly receives an adjusting screw 19. On the other hand, the head 15 has a stop 20 attached thereto. When the stop 20 bears on the tip of the adjusting screw 19, a needle in the lockstitching mechanism later described herein is properly opposed to a shuttle also later described herein. It should be noted that the arm frame body 14 is provided with a fastening handle 21 used to lock the head 15 which is in turn provided with a handle 22 for rotation and operation thereof.
Next, a lockstitching mechanism 24 will be described.
The lockstitching mechanism 24 comprises an upper mechanism 25 disposed in the head 15 and a lower mechanism 26 disposed interiorly of the bed 11. These are constructed similarly to a conventional sewing machine. Namely, in the upper mechanism 25, an arm shaft 28 for lockstitching is inserted in a hole 27 bored in a central position of the shank 17, and a thread take-up cam 29 is mounted on one end of the arm shaft 28, The cam 29 has a thread take-up lever 30 connected thereto. The head 15 has a needle bar 31, with a needle 33 attached to a lower end thereof, mounted thereon and movable up and down. The needle bar is connected to the cam 29 through a needle-bar connectin~
link 32. The head 15 is provided with a presser bar 34 movable up and down, the presser bar 34 having a presser foot 35 attached to a lower end thereof. The head 15 further has a thread tension regulator 36 mounted on the outer surface thereof. In the lower mechanism 26, a shuttle 37 is positioned below the needle bar lQ~83~9 31 in the upper mechanism 25. The shuttle 37 has a shuttle driving mechanism 38 connected thereto, which in turn has an oscillating driving shaft 39 connected thereto. The driving shaft 39 is connected to the arm shaft 38 through connecting rods 40 and 41. Accordingly, when the arm shaft 28 rotates, the needle bar 31 moves up and down and the shuttle 37 also turns in association therewith, whereby a needle thread passed through the needle 33 cooperates with a bobbin thread within the shuttle 37 to effect lockstitching of clothes.
An overedge stitching mechanism 44 will now be described. It is here pointed out that, as clearly shown in Figures 1, 4, 5, 7 and 8, the operative parts of this overedge stitching mechanism are lodged within a recess in the upright support 12 at the inner end of the ~shape made by the bed 11, the upright support 12 and the arm frame 13, this recess opening inwardly of the ~shape toward the lockstitching mechanism 24 and extending across the bed 11. This overedge stitching mechanism 44 is aiso constructed similarly to a mechanism of a conventional overedge stitching machine. That is, the upright support 12 is interiorly provided with an overedge stitching spindle 45 which is laterally supported in side wall 12a and a bearing member 46. A rotary plate 47 is mounted on one end of the spindle 45 and one end of a crank rod 48 is pivotally mounted at an eccentric position of the rotary plate 47. The crank rod 48 has the other end connected to a needle bar 49 which is supported movably up and down on supporting mem~ers 50 and 51. Thus, when the spindle 45 rotaies, the needle bar 49 moves up and down in association therewith. It will be noted that a needle 52 is attached to the lower end of the needle bar 49.
An eccentric 55 is secured to the spindle 45 and an annular member 56 fits in an outer peripheral surface of the eccentric 55. A suspending rod 57 is integrally connected to lQ~a83, 9 the annular member 56. A transmission rod 58 connected to the lower end of the rod 57 extends externally of the upright support 12 passing through a slot 59 bored through a side wall 12c in the form of a concavity in the upright support 12 and is connected to a midportion of an oscillatory arm 60 having one end pivotally mounted on the side wall 12c. The ocscillatory arm 60 has a cloth cutting edge 61 attached to the other end thereof.
With this construction, when the spindle 45 rotates, the oscillatory arm 60 is oscillated up and down through the rod 57 so that the article of clothing cutting edge 61 may cut an edge of clothes to be overedge stitched.
Also, an eccentric 64 is secured to the spindle 45 and an annular member 65 fits in an outer peripheral surface of the eccentric 64. A suspending rod 66 is integrally con-nected to the annular member 65. The rod 66 has its lower end connected to a looper driving member 67 so that when the spindle 45 rotates to move the rod 66 up and down, the looper driving member 67 is actuated and a looper 68 is then operated in as-sociation therewith.
Further, a triangular cam 69 is secured to the spindle45. An upper end of a bifurcated rod 70 is opposedly close to the triangular cam 69. A lower end of the bifurcated rod 70 is brought into association, in a known manner, with a feed dog 73 exposed at the upper surface of the bed 11, through a le~er 71, a shaft 72 and the like. Accordingly, when the spindle 45 rotates to cause the needle bar 49, the cloth cutting edge 61 and the looper 68 to actuate, the feed dog 73 is a~so associated therewith to effect the cloth feeding operation. It will be noted that a feed-amount setter 74 is connected to a midportion of the bifurcated rod 70 so that the amount of feeding of cloth by the cloth feed dog 73 may be adjusted by 1~a83~9 operation of a lever 75.
Next, a selecting mechanism 77 is provided on the side wall 12a of the upright support 12. The aforementioned lockstitching arm shaft 28 and the overedge stitching spindle 45 are designed to be interlocked with a motor 88, (Figure 2) which serves as a driving device, through the selecting mechanism 77. This selecting mechanism is principally shown in Figures 1 and 3. That is, pulleys 78 and 79 fit in the shaft 28 and spindle 45, respectively, so that the former may be freely rotated with respect to the shaft 28 and spindle 45, respectively, but may not be moved in an axial direction. Clutch members 80 and 81 are connected to the ends of shaft 28a and spindle 45a, respectively, in splined manner so that the former may be rotated integral with the spindlers, respect1vely, and may be moved in an axial direction. Mutually opposed surfaces in the pulleys 78 and 79 and the clutch members 80 and 81, respectively, are formed with a pair of concave portions 82 and 83 and raised p~rtions 84 and 85 adapted to be fitted or disengaged from each other. Accordingly, when the raised portion 84 is fitted in the concave portion 82, the pulley 78 and shaft 28 integrally rotate, and when the raised portion 85 is fitted in the concave portion 83, the pulley 79 and spindle 45 integrally rotate. In order to be driven by the motor 88, the pulleys 78 and 79 are connected with a pulley 89 mounted on a rotary shaft of the motor 88 by belts 86 and 87. It will be noted that the motor 88 is mounted on the back of the upright support 12 through a bracket 90 .
In the operation of lockstitching of clothes using the sewing machine as constructed above, the selecting mechanism 77 may be operated so that rotation of the motor 88 is trans-mitted only to the arm shaft 28 for lockstitching. The head 15 is placed to assume a position as shown in Figure 1 with l~g8379 respect to the arm frame body 14 and secured by the fastening handle 21. When the motor 88 is rotated in a state as described above, the lockstitching work for clothes may be accomplished by the lockstitch mechanism 24 entirely similarly to a con-ventional lockstitch sewing machine and in a state as indicated by full line in Figure 6.
Next, in the operation of overedge stitching of clothes, the selecting mechanism 77 may be operated so that rotation of the motor 88 is transmitted only to the spindle 45 for overedge stitching. The head 15 is placed to assume a position as shown in Figure 5 with respect to the arm frame body 14 and secured by the fastening handle 21. When the motor 88 is rotated in a state as described above, the ~veredge stitching work for clothes may be accomplished by the overedge stitching mechanism 44 entirely similarly to a conventional overedge sewing machine and in a state as indicated by phantom line. In this case, even if the upper mechanism 25 in the lockstitch mechanism 24 is disposed at the foremost end of the arm frame 13, it is positioned greatly withdrawn from the upper surface of the bed 11 as shown in Figure 5. Hence, the upper mechanism 25 will not stand in the way of clothes 91 to be overedge stitched as shown in Figure 4. This facilitates the overedge stitching work.
It should be appreciated that in alternately carry-ing out the lockstitching work and overedge stitching as previously mentioned, the loc~stitching mechanism 24 and the overedge stitching mechanism 44 are positioned with respect to the machine frame 10 as previously mentioned in the present sewing machine, so that either way of sewing may be initiated immediately only by slight movement of hand as shown in Fig. 6.
A~so, in this case, either sewing mechanism 24 or 44 alone may be moved by means of the selectin~ mechanism 77.
Accordingly, the motor 8~ may ~e o~ comparatively low power.
~Q~8379 ~
Further, there is prevention of accidents involved in a case, for ~xample, where clothes to be lockstitched erroneously get entangled in the overedge stitching mechanism 44 during the operation of lockstitching sewing.
Moreover, since the upright support 12 is interposed between the lockstitch mechanism 24 and overedge stitching mechanism 44, which are positioned to left of the upright 6Up-port 12, and the selecting mechanism 77, which is positioned opposite thereto, clothes may be moved by the left hand and at the same time, the selecting mechanism 77 may be operated by the right hand, during the operation as mentioned above.
Figures 7 and 8 illustrate a different embodiment.
The sewing machines shown in these figures are so designed that an upright support 12e is provided separately from an arm frame 13e, both being connected by a bolt 110 as a connecting member.
A bed lle is de~igned in the form of an elongated structure and being raised from a base 111 so that the sleeves of a coat may be conveniently sewn.
In addition, in the selecting mechanism 77e, a belt 87e used to rotate a pulley 79e is passed over a pulley 112 sec~red to a pulley 78e.
In such sewing machines wherein the upright support 12e is separated from the arm frame 13e, it is possible to easily perform machining of a hole for supporting a needle bar 49e in an overedge stitching mechanism 44e, machining a hole for supporting a spindle 45e for overedge stitching, machining a hole for carrying a ~ase of a looper 68e or work for affixing various parts to these holes.
Those parts in sewing machines shown in Figures 7 and 8 considered to have identical or e~ual constructions in terms of function to those sewing machines shown in Fgirues 1 _g_ through 6 are indicated by reference numerals with a suffix e added thereto to avoid the need of duplicated description.
Next, Figure 9 shows a detailed construction of a presser foot in the overedge stitching mechanism 44e of the sewing machine shown in Figure 8. A shaft 113 supported on an upright support 12ce is normally biased by a spring 114 shown in Figure 8 in a direction as indicated by the arrow 116.
The shaft 113 may be rotated in a direction as indicated by the arrow 117 by means of a handle 115 mounted on one end thereof. The shaft 113 has a bracket 118 secured to the other end thereof, and a holder member 119 for holding a presser foot 54e is pivotally mounted on the bracket 118 by a pin 120. The aforesaid pivotal position is displaced from a center line 122 of the presser foot 54e through a distance as indicated at W.
The abovementioned construction, in which the presser foot 54e is supported, allows the presser foot 54e, when a thread is passed through a needle 52e shown in Figure 8, to be moved in a direction as indicated by the arrow 123, thus facili-tating work of passing a thread through a needle.
Further, where the presser foot 54e is then returned to a position as shown in Figure 9 for sewing of clothes, when the clothes are fed in a direction as indicated by the arrow 124, the presser foot 54e is always maintained in a position as shown by the presence of the a~oresaid distance W.
Figure 10 shows a cover 125 for covering the overedge stitching mechanism. In the operation of lockstitching, the cover 125 covers up the overedge stitching mechanism as shown in Figure 11 to prevent clothes from being entangled in the needle or other parts in the overedge stitching mechanism.
The cover 125 may be attached to the upright support by placing a magnet 126 affixed to the cover 125 on the upright support or other suitable stop means.
10~83~9 Finally, Figure 12 shows a state where the upper mechanism in the overlock stitching mechanism is covered up by a cover 127. In the operation of the overedge stitching, the upper mechanism may be covered up by the cover 127 as just mentioned to thereby prevent clothes from being entangled in the needle in the upper mechanism or other parts. It should be noted that the cover 127 may be mounted in a manner similar to that is accomplished when the cover 125 is mounted.
When pieces of cloth are sewn together to make clothing, it is necessary, even in the making of a single article of clothing, to select the way of sewing suitable for a variety of sewing types. That is, for example, when an edge of a piece of cloth is stitched, overedge stitching is employed, and on the other hand, when a plurality of pieces of fabric are sewn together, lockstitching is employed. Because of such stitching requirements, if two sewing machines, one for the lockstitching and the other for the overedge stitching, have ~o be accommodated for example in an ordinary household, it poses a problem that these machines occupy a very large space when they are put in a house-work room.
In addition, when articles of clothing are made in a household, there is often involved the procedure of applying the overedge stitching to a first portion, thereof, thereafter the lockstitching to a second portion, and the overedge stitching to a third portion, and thereafter again the lockstitching thereto. In such case, if an attempt i made to perform sewing using two different sewing machines, the operation, in which an operator leaves one seat and takes the other seat w~ere sewing takes place and thereafter the operator returns to the first seat for sewing, must be repetitiously conducted.
It is therefore an object of the present invention to provide a sewing machine in which two modes of sewing, one for lockstitching and the other for overedge stitching can be achieved by a single sewing machine.
It is a further object of the present invention to provide a sewing machine in which even in the case where the two modes of sewing as described above are alternately carried out, either way of sewing may be immediately conducted by only ,; --1--~Q`'a~379 a slight movement of hand.
It is another ob~ect of the present invention to provide a sewing machine of a compact style externally similar to conventional sewing machines which can merely perform a single way of sewing, despite the fact that the proposed sewing machine may perform two modes of sewing as previously mentioned.
In accordance with the above objects, the invention as herein claimed lies essentially in a sewing machine having a body including: a bed; a support extending upwardly from one end of said bed and an arm frame extending at one end from the upper end of said upright support over and parallel to said bed whereby said body is ~shaped with the free end of said arm lying above the free end of said bed; a lockstitching mechanism including an upper lockstitching means depending from said free end of said arm frame and a lower lockstitching means in said free end of said bed, the improvement in the combination there-with comprising:
means defining a recess in said support at the inner end of said ~shape, said recess opening inwardly of said ~shape toward the free ends of said bed and of said arm frame and extending across said bed; said recess having a top wall facing said bed, and an overedge stitching mechanism including an overedge stitching needle movable up and down from said recess upper wall and a looper proiecting upwardly from said bed to cooperate with said overedge stitching needle within said recess and ~eing lodged therein.
Other objects and advantages of the invention will become apparent during the following description of preferred 3~ embodiments haviny reference to the appended drawings wherein:
Figure 1 is a front view, partly in section, of a sewing machine, according to a first embodiment of the invention;
1~8379 Figure 2 is a side view on the right side;
Figure 3 is a longitudinal sectional view of a selecting mechanism;
Figure 4 is a front view showing the state of the sewing machine in the case of overedge stitching;
Figure S is a side view on the left side, partly in section, showing the state similar to that of Figure 4;
Figure 6 is a plan view showing the state where lockstitching and overedge stitching are alternately carried out;
Figure 7 is an exploded perspective view showing another embodiment;
Figure 8 is a front view, partly in section, showing the state where the overedge stitching is carried out by the sewing machine shown in Figure 7;
Figure 9 is a perspective view of a cloth holding section;
Figure 10 is a perspective view of a cover for covering an overedge stitching mechanism;
Figure 11 is a front view showing the state where the overedge stitching mechanism is covered with the cover; and ~igure 12 is a front view showing the state where an upper mechanism in a lockstitching mechanism is covered by a cover.
Referrlng now to Fig~res 1 through 6, the reference numeral 10 designates a machine frame of the entire sewing machine. This machine frame 10 comprises a bed 11, an upright support 12 uprightly extending from the bed 11, and an arm frame 13 extended parallel with the upper surface of the bed 11 from 3~ the upper end of the upright support 12. The arm frame 13 comprises an arm frame body 14 integral with the upright sup-port 12 and a head 1~ connected to the foremost end of the arm lQ~8379 frame body 14. The head 15 is rotatably mounted on the arm frame body 14. That is, the arm frame body 14 is formed at its foremost end with a bearing hole 16 whereas the head 15 has a shank 17, which is rotatably received in the bearing hole 16.
In a connection between the arm frame body 14 and the head 15, the arm frame body 14 has a projection 18 extended there-from, (Figùre 4), which projection 18 threadedly receives an adjusting screw 19. On the other hand, the head 15 has a stop 20 attached thereto. When the stop 20 bears on the tip of the adjusting screw 19, a needle in the lockstitching mechanism later described herein is properly opposed to a shuttle also later described herein. It should be noted that the arm frame body 14 is provided with a fastening handle 21 used to lock the head 15 which is in turn provided with a handle 22 for rotation and operation thereof.
Next, a lockstitching mechanism 24 will be described.
The lockstitching mechanism 24 comprises an upper mechanism 25 disposed in the head 15 and a lower mechanism 26 disposed interiorly of the bed 11. These are constructed similarly to a conventional sewing machine. Namely, in the upper mechanism 25, an arm shaft 28 for lockstitching is inserted in a hole 27 bored in a central position of the shank 17, and a thread take-up cam 29 is mounted on one end of the arm shaft 28, The cam 29 has a thread take-up lever 30 connected thereto. The head 15 has a needle bar 31, with a needle 33 attached to a lower end thereof, mounted thereon and movable up and down. The needle bar is connected to the cam 29 through a needle-bar connectin~
link 32. The head 15 is provided with a presser bar 34 movable up and down, the presser bar 34 having a presser foot 35 attached to a lower end thereof. The head 15 further has a thread tension regulator 36 mounted on the outer surface thereof. In the lower mechanism 26, a shuttle 37 is positioned below the needle bar lQ~83~9 31 in the upper mechanism 25. The shuttle 37 has a shuttle driving mechanism 38 connected thereto, which in turn has an oscillating driving shaft 39 connected thereto. The driving shaft 39 is connected to the arm shaft 38 through connecting rods 40 and 41. Accordingly, when the arm shaft 28 rotates, the needle bar 31 moves up and down and the shuttle 37 also turns in association therewith, whereby a needle thread passed through the needle 33 cooperates with a bobbin thread within the shuttle 37 to effect lockstitching of clothes.
An overedge stitching mechanism 44 will now be described. It is here pointed out that, as clearly shown in Figures 1, 4, 5, 7 and 8, the operative parts of this overedge stitching mechanism are lodged within a recess in the upright support 12 at the inner end of the ~shape made by the bed 11, the upright support 12 and the arm frame 13, this recess opening inwardly of the ~shape toward the lockstitching mechanism 24 and extending across the bed 11. This overedge stitching mechanism 44 is aiso constructed similarly to a mechanism of a conventional overedge stitching machine. That is, the upright support 12 is interiorly provided with an overedge stitching spindle 45 which is laterally supported in side wall 12a and a bearing member 46. A rotary plate 47 is mounted on one end of the spindle 45 and one end of a crank rod 48 is pivotally mounted at an eccentric position of the rotary plate 47. The crank rod 48 has the other end connected to a needle bar 49 which is supported movably up and down on supporting mem~ers 50 and 51. Thus, when the spindle 45 rotaies, the needle bar 49 moves up and down in association therewith. It will be noted that a needle 52 is attached to the lower end of the needle bar 49.
An eccentric 55 is secured to the spindle 45 and an annular member 56 fits in an outer peripheral surface of the eccentric 55. A suspending rod 57 is integrally connected to lQ~a83, 9 the annular member 56. A transmission rod 58 connected to the lower end of the rod 57 extends externally of the upright support 12 passing through a slot 59 bored through a side wall 12c in the form of a concavity in the upright support 12 and is connected to a midportion of an oscillatory arm 60 having one end pivotally mounted on the side wall 12c. The ocscillatory arm 60 has a cloth cutting edge 61 attached to the other end thereof.
With this construction, when the spindle 45 rotates, the oscillatory arm 60 is oscillated up and down through the rod 57 so that the article of clothing cutting edge 61 may cut an edge of clothes to be overedge stitched.
Also, an eccentric 64 is secured to the spindle 45 and an annular member 65 fits in an outer peripheral surface of the eccentric 64. A suspending rod 66 is integrally con-nected to the annular member 65. The rod 66 has its lower end connected to a looper driving member 67 so that when the spindle 45 rotates to move the rod 66 up and down, the looper driving member 67 is actuated and a looper 68 is then operated in as-sociation therewith.
Further, a triangular cam 69 is secured to the spindle45. An upper end of a bifurcated rod 70 is opposedly close to the triangular cam 69. A lower end of the bifurcated rod 70 is brought into association, in a known manner, with a feed dog 73 exposed at the upper surface of the bed 11, through a le~er 71, a shaft 72 and the like. Accordingly, when the spindle 45 rotates to cause the needle bar 49, the cloth cutting edge 61 and the looper 68 to actuate, the feed dog 73 is a~so associated therewith to effect the cloth feeding operation. It will be noted that a feed-amount setter 74 is connected to a midportion of the bifurcated rod 70 so that the amount of feeding of cloth by the cloth feed dog 73 may be adjusted by 1~a83~9 operation of a lever 75.
Next, a selecting mechanism 77 is provided on the side wall 12a of the upright support 12. The aforementioned lockstitching arm shaft 28 and the overedge stitching spindle 45 are designed to be interlocked with a motor 88, (Figure 2) which serves as a driving device, through the selecting mechanism 77. This selecting mechanism is principally shown in Figures 1 and 3. That is, pulleys 78 and 79 fit in the shaft 28 and spindle 45, respectively, so that the former may be freely rotated with respect to the shaft 28 and spindle 45, respectively, but may not be moved in an axial direction. Clutch members 80 and 81 are connected to the ends of shaft 28a and spindle 45a, respectively, in splined manner so that the former may be rotated integral with the spindlers, respect1vely, and may be moved in an axial direction. Mutually opposed surfaces in the pulleys 78 and 79 and the clutch members 80 and 81, respectively, are formed with a pair of concave portions 82 and 83 and raised p~rtions 84 and 85 adapted to be fitted or disengaged from each other. Accordingly, when the raised portion 84 is fitted in the concave portion 82, the pulley 78 and shaft 28 integrally rotate, and when the raised portion 85 is fitted in the concave portion 83, the pulley 79 and spindle 45 integrally rotate. In order to be driven by the motor 88, the pulleys 78 and 79 are connected with a pulley 89 mounted on a rotary shaft of the motor 88 by belts 86 and 87. It will be noted that the motor 88 is mounted on the back of the upright support 12 through a bracket 90 .
In the operation of lockstitching of clothes using the sewing machine as constructed above, the selecting mechanism 77 may be operated so that rotation of the motor 88 is trans-mitted only to the arm shaft 28 for lockstitching. The head 15 is placed to assume a position as shown in Figure 1 with l~g8379 respect to the arm frame body 14 and secured by the fastening handle 21. When the motor 88 is rotated in a state as described above, the lockstitching work for clothes may be accomplished by the lockstitch mechanism 24 entirely similarly to a con-ventional lockstitch sewing machine and in a state as indicated by full line in Figure 6.
Next, in the operation of overedge stitching of clothes, the selecting mechanism 77 may be operated so that rotation of the motor 88 is transmitted only to the spindle 45 for overedge stitching. The head 15 is placed to assume a position as shown in Figure 5 with respect to the arm frame body 14 and secured by the fastening handle 21. When the motor 88 is rotated in a state as described above, the ~veredge stitching work for clothes may be accomplished by the overedge stitching mechanism 44 entirely similarly to a conventional overedge sewing machine and in a state as indicated by phantom line. In this case, even if the upper mechanism 25 in the lockstitch mechanism 24 is disposed at the foremost end of the arm frame 13, it is positioned greatly withdrawn from the upper surface of the bed 11 as shown in Figure 5. Hence, the upper mechanism 25 will not stand in the way of clothes 91 to be overedge stitched as shown in Figure 4. This facilitates the overedge stitching work.
It should be appreciated that in alternately carry-ing out the lockstitching work and overedge stitching as previously mentioned, the loc~stitching mechanism 24 and the overedge stitching mechanism 44 are positioned with respect to the machine frame 10 as previously mentioned in the present sewing machine, so that either way of sewing may be initiated immediately only by slight movement of hand as shown in Fig. 6.
A~so, in this case, either sewing mechanism 24 or 44 alone may be moved by means of the selectin~ mechanism 77.
Accordingly, the motor 8~ may ~e o~ comparatively low power.
~Q~8379 ~
Further, there is prevention of accidents involved in a case, for ~xample, where clothes to be lockstitched erroneously get entangled in the overedge stitching mechanism 44 during the operation of lockstitching sewing.
Moreover, since the upright support 12 is interposed between the lockstitch mechanism 24 and overedge stitching mechanism 44, which are positioned to left of the upright 6Up-port 12, and the selecting mechanism 77, which is positioned opposite thereto, clothes may be moved by the left hand and at the same time, the selecting mechanism 77 may be operated by the right hand, during the operation as mentioned above.
Figures 7 and 8 illustrate a different embodiment.
The sewing machines shown in these figures are so designed that an upright support 12e is provided separately from an arm frame 13e, both being connected by a bolt 110 as a connecting member.
A bed lle is de~igned in the form of an elongated structure and being raised from a base 111 so that the sleeves of a coat may be conveniently sewn.
In addition, in the selecting mechanism 77e, a belt 87e used to rotate a pulley 79e is passed over a pulley 112 sec~red to a pulley 78e.
In such sewing machines wherein the upright support 12e is separated from the arm frame 13e, it is possible to easily perform machining of a hole for supporting a needle bar 49e in an overedge stitching mechanism 44e, machining a hole for supporting a spindle 45e for overedge stitching, machining a hole for carrying a ~ase of a looper 68e or work for affixing various parts to these holes.
Those parts in sewing machines shown in Figures 7 and 8 considered to have identical or e~ual constructions in terms of function to those sewing machines shown in Fgirues 1 _g_ through 6 are indicated by reference numerals with a suffix e added thereto to avoid the need of duplicated description.
Next, Figure 9 shows a detailed construction of a presser foot in the overedge stitching mechanism 44e of the sewing machine shown in Figure 8. A shaft 113 supported on an upright support 12ce is normally biased by a spring 114 shown in Figure 8 in a direction as indicated by the arrow 116.
The shaft 113 may be rotated in a direction as indicated by the arrow 117 by means of a handle 115 mounted on one end thereof. The shaft 113 has a bracket 118 secured to the other end thereof, and a holder member 119 for holding a presser foot 54e is pivotally mounted on the bracket 118 by a pin 120. The aforesaid pivotal position is displaced from a center line 122 of the presser foot 54e through a distance as indicated at W.
The abovementioned construction, in which the presser foot 54e is supported, allows the presser foot 54e, when a thread is passed through a needle 52e shown in Figure 8, to be moved in a direction as indicated by the arrow 123, thus facili-tating work of passing a thread through a needle.
Further, where the presser foot 54e is then returned to a position as shown in Figure 9 for sewing of clothes, when the clothes are fed in a direction as indicated by the arrow 124, the presser foot 54e is always maintained in a position as shown by the presence of the a~oresaid distance W.
Figure 10 shows a cover 125 for covering the overedge stitching mechanism. In the operation of lockstitching, the cover 125 covers up the overedge stitching mechanism as shown in Figure 11 to prevent clothes from being entangled in the needle or other parts in the overedge stitching mechanism.
The cover 125 may be attached to the upright support by placing a magnet 126 affixed to the cover 125 on the upright support or other suitable stop means.
10~83~9 Finally, Figure 12 shows a state where the upper mechanism in the overlock stitching mechanism is covered up by a cover 127. In the operation of the overedge stitching, the upper mechanism may be covered up by the cover 127 as just mentioned to thereby prevent clothes from being entangled in the needle in the upper mechanism or other parts. It should be noted that the cover 127 may be mounted in a manner similar to that is accomplished when the cover 125 is mounted.
Claims (8)
1. A sewing machine having a body including: a bed;
a support extending upwardly from one end of said bed and an arm frame extending at one end from the upper end of said upright support over and parallel to said bed whereby said body is ]-shaped with the free end of said arm frame lying above the free end of said bed; a lockstitching mechanism including an upper lockstitching means depending from said free end of said arm frame and a lower lockstitching means in said free end of said bed, the improvement in the combination therewith comprising:
means defining a recess in said support at the inner end of said ]-shape, said recess opening inwardly of said ]-shape toward the free ends of said bed and of said arm frame and extending across said bed; said recess having a top wall facing said bed, and an overedge stitching mechanism including an overedge stitching needle movable up and down from said recess upper wall and a looper projecting upwardly from said bed to cooperate with said overedge stitching needle within said recess and being lodged therein.
a support extending upwardly from one end of said bed and an arm frame extending at one end from the upper end of said upright support over and parallel to said bed whereby said body is ]-shaped with the free end of said arm frame lying above the free end of said bed; a lockstitching mechanism including an upper lockstitching means depending from said free end of said arm frame and a lower lockstitching means in said free end of said bed, the improvement in the combination therewith comprising:
means defining a recess in said support at the inner end of said ]-shape, said recess opening inwardly of said ]-shape toward the free ends of said bed and of said arm frame and extending across said bed; said recess having a top wall facing said bed, and an overedge stitching mechanism including an overedge stitching needle movable up and down from said recess upper wall and a looper projecting upwardly from said bed to cooperate with said overedge stitching needle within said recess and being lodged therein.
2. A sewing machine as claimed in claim 1, wherein said overedge stitching mechanism further comprises: a needle support rod extending through said upper wall of said recess and means mounting said overedge stitching needle at the lower end of said support rod; means in said upright support driving said support rod and needle up and down, said driving means including a rotary spindle; means within said bed and said upright support interconnecting said rotary spindle and said looper to synchronize operation thereof.
3. A sewing machine as claimed in claim 2, wherein said upper lockstitching means comprises:
- a needle bar projecting at right angle from said arm frame and having a lockstitch needle at the lower end thereof; lockstitch needle bar drive means to drive said needle bar and needle up and down and including a lockstitch arm shaft extending inwardly along said arm frame;
wherein said lower stitching means comprises:
- a shuttle in said bed at the free end thereof for cooperation with said lockstitching needle;
- a shuttle driving shaft extending inwardly of and along said bed, and connecting means joining said lockstitching arm shaft and said shuttle driving shaft through said upright support whereby to drive said shafts in synchronism.
- a needle bar projecting at right angle from said arm frame and having a lockstitch needle at the lower end thereof; lockstitch needle bar drive means to drive said needle bar and needle up and down and including a lockstitch arm shaft extending inwardly along said arm frame;
wherein said lower stitching means comprises:
- a shuttle in said bed at the free end thereof for cooperation with said lockstitching needle;
- a shuttle driving shaft extending inwardly of and along said bed, and connecting means joining said lockstitching arm shaft and said shuttle driving shaft through said upright support whereby to drive said shafts in synchronism.
4. A sewing machine as claimed in claim 3, further comprising means outwardly of said upright support, on one side thereof away from said arm frame and bed free ends, for driving said lockstitching arm shaft and said overedge stitching spindle into rotation and including a selection mechanism for rotating said shafts selectively.
5. A sewing machine according to claim 1, 2 or 3, whrein said arm frame comprises a head connected to the free end of said arm frame and provided with said upper lockstitching means, said head being connected rotatably with respect to said arm frame so as to allow said upper lockstitching means to be rotated laterally with respect to a cloth feed direction and away from said lower lockstitching means.
6. A sewing machine according to claim 1, 2 or 3, characterized in that said upright support and said arm frame are constructed separately from each other and are integrally connected by a connecting means.
7. A sewing machine according to claim 1, 2 or 3, comprising a removable cover to close up said recess.
8. A sewing machine according to claim 1, 2 or 3, comprising a cover for covering said upper lockstitching means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4888778A JPS54140651A (en) | 1978-04-24 | 1978-04-24 | Machine both for final sewing and for lockksewing |
| JP48887 | 1978-04-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1098379A true CA1098379A (en) | 1981-03-31 |
Family
ID=12815780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA315,738A Expired CA1098379A (en) | 1978-04-24 | 1978-11-02 | Sewing machine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS54140651A (en) |
| CA (1) | CA1098379A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018205835A1 (en) * | 2018-04-17 | 2019-10-17 | Pfaff Industriesysteme Und Maschinen Gmbh | sewing machine |
-
1978
- 1978-04-24 JP JP4888778A patent/JPS54140651A/en active Pending
- 1978-11-02 CA CA315,738A patent/CA1098379A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54140651A (en) | 1979-11-01 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |