JP3455248B2 - Overlock sewing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overlock sewing machine having a release device, and more particularly to an overlock sewing machine which performs at least one kind of sewing other than overlock sewing and overlock sewing. About the sewing machine. 2. Description of the Related Art In overlock sewing using an overlock sewing machine, sewing is performed while cutting a cloth by sliding an upper knife and a lower knife. This cloth cutting device is capable of swinging up and down. There is known an upper knife swinging member which supports an upper knife, and drives the upper knife swinging member up and down by an upper knife driving means using a main shaft of the sewing machine as a driving source. [0003] By the way, edge overlocking with cloth cutting,
When using an overlock sewing machine that can perform both double chain stitching and special stitching without cloth cutting, when performing double chain stitching and special stitching (for example, flat stitching), move the upper knife from the needle plate surface. It is necessary to release it upward and release the upper looper below the bed surface. Conventionally, the upper knife release and the upper looper release are performed by separate devices. [0004] Thus, when performing double chain stitching and special stitching, the operation of the upper knife release and the
Since the operation of the upper looper release must be performed separately, the operation is complicated. In Japanese Patent Application Laid-Open No. 61-248993, a movable section of a bed frame is provided with a cloth cutting knife mechanism. By opening the movable section, the drive mechanism of the knife is cut off and the upper knife is cut off. Although a method of stopping the driving is disclosed, even if this method is used, the upper looper needs to be released separately, resulting in a complicated structure and high cost. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an overlock sewing machine which can release an upper knife and release an upper looper and simultaneously retract and stop the upper knife and upper looper by one operation. . [0007] In order to achieve the above object, the invention according to the first aspect has an upper knife and an upper looper for cutting cloth, and is provided with an overlock sewing and an overlock sewing. In an overlock sewing machine that performs at least one type of sewing,
An upper knife driving means for swinging the upper knife up and down, an upper looper driving means for swinging the upper looper, a switching lever (66) rotatably supported on a support base, and a rotation of the switching lever. A first connecting member (44a, 44a, which can attach and detach the connection between the upper looper driving means and the main shaft in conjunction with the moving operation.
48), a second connecting member (26, 84, 84a) capable of attaching and detaching a connection between the upper knife driving means and the main shaft in conjunction with a rotation operation of the switching lever; A moving cam (80) that rotates in conjunction with the rotating operation, abuts on the second connecting member (26), and can retreat the upper knife upward, and when sewing is performed without using a knife, By rotating the switching lever, the swinging of the upper knife by the upper knife driving means is stopped, the upper knife is retracted upward, and the swinging of the upper looper by the upper looper driving means is stopped. The upper looper is retracted downward . In the overlock sewing machine according to the present invention, at the time of sewing without using a knife, the swinging of the upper knife by the upper knife driving means is stopped and the upper knife is retracted upward by operating the release device. Further, the swing of the upper looper by the upper looper driving means is stopped, and the upper looper is retracted downward. An embodiment of an overlock sewing machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an entire overlock sewing machine suitable for applying this embodiment. The overlock sewing machine 2 includes an arm 4 and a bed 6. Arm 4
Is provided with one or two needles 8 and 10 movably up and down, and the bed is provided with a needle plate 12 so as to be located below the needles 8 and 10. FIG. 2 is a perspective view of a release device of the overlock sewing machine according to the present embodiment, FIG. 3 is an exploded perspective view of the device of FIG. 2, and FIG. 4 is a top view showing a switching device of the device of FIG. These figures show the state when the upper knife and the upper looper are driven. The release device of this embodiment includes an upper knife driving section A, an upper looper driving section B and a switching section C. First, the upper knife driving section A will be described. In FIG. 1, an upper knife swinging shaft 14 and a movable piece supporting shaft 16 are supported by a frame 17 and extend in parallel with a main shaft 18. The lower end of an upper knife drive rod 22 is connected to the main shaft 18 via an upper knife drive cam 20. The upper end of the drive connecting arm 24 is connected to the upper end of the upper knife drive rod 22. One end of the drive intermediate arm 26 is a long groove, and the upper knife drive arm 30 is connected to a square ridge 36 fitted in the long groove. The drive connecting arm 24 and the drive intermediate arm 26 have a through hole and a bifurcated portion at the other end, respectively, and the moving piece support shaft 16 fixed to the frame 17 passes through the through hole. An upper knife swing arm 28 and one end of an upper knife drive arm 30 are fixed to the upper knife swing shaft 14, respectively. The upper knife swing arm 28 has an upper knife 32 at the other end. The upper knife drive arm 30 is constantly urged downward by a spring 34, and a square sesame 36 is connected to the other end. The upper knife driving section A has the above configuration. When the main shaft 18 rotates, the upper knife driving rod 22 swings up and down due to the rotational eccentric movement of the upper knife driving cam 20, and this swinging movement is driven. The power is transmitted to the upper knife drive arm 30 via the square sesame 36 fitted in the groove of the intermediate arm 26, and the upper knife swing shaft 14 is reciprocated. Therefore, the upper knife 32 of the tip of the upper knife swing arm 28 fixed to the upper knife swing shaft 14 swings up and down and is pressed by the lower knife 38 located on the side surface of the needle plate 12 and a spring (not shown). The cloth edge can be cut in the state. Next, the upper looper driving section B will be described. The main shaft 18 further includes an upper looper drive cam 43.
The upper end of the upper looper drive rod 40 is connected via the. The lower end of the upper looper drive rod 40 is connected to an upper looper drive arm 42 fixed to the upper looper drive shaft 41. An upper looper moving piece 44 is fitted to the upper looper drive shaft 41 so as to be movable in the front-rear direction (direction of arrow HI), and the upper looper moving piece 44 is always forward (in the direction of arrow I) by an upper looper moving piece spring 46. ). A forked portion is formed on the upper looper moving piece 44, and a connecting pin 44a is fixed. Connection pin 44a of upper looper moving piece 44
Is fitted to the forked portion 48a of the upper looper swing arm 48 fixed to the upper looper drive shaft 41 by a screw 48b. The upper looper upper and lower arms 50 between the upper looper moving piece 44 and the upper looper swing arm 48 pass through the upper looper drive shaft 41 and are in a free state.
a is fitted. One end of an upper looper slide shaft 52 is connected to the other end of the upper looper upper and lower arms 50, and an upper looper 54 is attached to the other end of the upper looper slide shaft 52. The upper looper drive section B has the above-described structure. When the main shaft 18 rotates, the upper looper drive rod 40 swings up and down, and the swinging motion is caused by the upper looper drive arm 42, the upper looper drive shaft 41, It is transmitted to the upper looper upper and lower arms 50 and the upper looper 54 via the upper looper swing arm 48 and the connecting pin 44a.
Next, the switching unit C will be described. The switching gear 58 and the intermediate gear 6 are mounted on the support 56.
0 and a moving gear 62 are provided. Switching gear 58
Is fixed to a switching lever support shaft 64. The switching lever support shaft 64 further includes a switching lever 66 and a conversion arm 6.
8 is fixed. A switching lever spring 70 is provided between the switching lever 66 and the support 56. Conversion arm 68
One end of a connecting link 72 is connected to the end of the upper link. The other end of the connecting link 72 has an upper looper swing switching arm 76 rotatable around a switching arm support shaft 74 supported by a frame.
Are connected. The lower end of the upper looper swing switching arm 76 has a pin 76a which engages with the fork of the upper looper moving piece 44.
Is provided. An intermediate gear support shaft 7 for fixing the intermediate gear 60
A moving cam 80 is fixed to the end of the shaft 8 and is rotated simultaneously with the intermediate gear 60. The moving gear 62 is screwed onto a threaded moving gear shaft 82 so that the moving gear 62 itself moves on the moving gear shaft 82 by rotation. A fork of a moving piece 84 slidably mounted on the moving piece support shaft 16 is fitted to the moving gear 62. A connection pin 84 a that fits into the fork of the drive intermediate arm 26 and the drive connection arm 24 is fixed to the moving piece 84. The moving piece 84 is constantly biased in the direction of the drive intermediate arm 26 by a moving piece spring 86 (supported by a frame or cantilever). When performing overcasting, the switching lever 66 is rotated in the direction of arrow G as shown in the figure, and the rotation of the main shaft 18 is transmitted to the upper knife drive section A and the upper looper drive section B as described above. . A description will be given of a case where the switching lever 66 is switched to the open (release) position in the upper knife and upper looper switching device having the above-described configuration. First, the operation of the upper looper drive switching will be described. When the switching lever 66 is rotated in the direction of arrow F, the conversion arm 68 fixed to the switching lever support shaft 64 swings downward, and the connecting link 72 is moved. Push down. For this reason,
The upper looper swing switching arm 76 swings back and forth about the switching arm support shaft 74, and the upper looper moving piece 44 is moved on the upper looper drive shaft 41 by the pin 76 a engaged with the fork of the upper looper moving piece 44. Is moved backward (in the direction of arrow H). Therefore,
The connecting pin 44a of the upper looper moving piece 44 separates rearward from the forked portion 48a of the upper looper swing arm 48, and thereafter, the upper looper driving arm 42 moves up and down by the upper looper driving rod 40.
The transmission of the oscillating movement via the is stopped. The upper looper upper and lower arms 50 and the upper looper 54 attached to the upper ends of the upper looper slide shafts 52 are lowered downward and stopped by the upper looper moving piece 44 being detached rearward. In this way, the upper looper 54 stops driving and is retracted downward. Next, the operation of switching the upper knife drive will be described. When the switching lever 66 is rotated in the direction of arrow F, the rotation of the switching gear 58 causes the moving gear 62 to rotate via the intermediate gear 60, and moves rightward on the moving gear shaft 82. Therefore, the moving piece 84 to which the moving gear 62 fits also moves rightward on the moving piece support shaft 16, the connecting pin 84 a is disengaged from the fork of the drive connecting arm 24, and the movement of the upper knife drive rod 22 is stopped. The power is not transmitted to the drive intermediate arm 26 and the upper knife drive arm 30, and the vertical swing of the upper knife swing arm 28 is stopped. FIG. 5 is a partial side view of the present embodiment, in which the drive connecting arm 24 and the switching lever 66 are shown by a dashed line when driving the upper knife (G), and the solid lines and other parts are upper. The state at the time of the female release is shown (F). FIG. 6 is an enlarged view of the moving cam 80. In this figure, the moving cam 80 has a projection 80A and a tip 80.
B, a rear end portion 80C. As will be described later, the drive intermediate arm 26 comes into contact with the protruding portion 80C when the upper knife is released, comes into contact with the tip portion 80B when the upper knife is driven, and comes into contact with the protruding portion 80A when stopped. Touch FIGS. 7 to 9 are views showing the state of the mechanism of the main part of this embodiment at the time of opening the upper knife, at the intermediate time (the switching lever 66 is moving upward or downward), and at the time of driving. FIGS. 7 (A), 8 (A) and 9 (A) show a state in which the connecting pin 84a of the moving piece 84 is engaged with or disengaged from the bifurcation of the driving intermediate arm 26 by rotation of the moving gear 62. FIGS. 7 (B), 8 (B), and 9 (B) are schematic views showing how the moving cam 80 and the drive intermediate arm 26 abut or separate from each other. In FIG. 7A, when the upper knife is released, the connecting pin 84a of the moving piece 84 is connected to the drive connecting arm 2 as described above.
4, but at this time, as shown in FIG. 7 (B), an intermediate gear support shaft 7 for fixing the intermediate gear 60.
8 is fixed to the tip of the intermediate gear 6.
With the rotation of 0, the rear end portion 80C is rotated to a position where it comes into contact with the drive intermediate arm 26, and the drive intermediate arm 26 is rotated clockwise about the movable piece support shaft 16 in the drawing to Push the position up. Therefore, the upper knife drive arm 30 and the upper knife swing arm 28 are rotated counterclockwise, and the upper knife 32 is retracted upward above the needle plate 12 surface. The position of the upper knife drive arm 30 at this time is represented by a point P on the extension line. In FIG. 8A, the connecting pin 84a of the moving piece 84 moves in the direction of the arrow at the time of the transition to the time of driving the upper knife, and is directed to the fork of the driving connecting arm 24. At this time, as shown in FIG. 8B, the moving cam 80 rotates counterclockwise, and the protrusion 80A
Contact 6 Due to the rotation of the moving cam 80, the drive intermediate arm 26 rotates counterclockwise in the drawing around the movable piece supporting shaft 16, and pushes down the position of the square sesame 36 downward. Therefore, the upper knife drive arm 30 and the upper knife swing arm 28 are rotated clockwise, but the position shown in the figure indicates the time when the phase of the upper knife drive is at the bottom dead center. The position of 30 is represented by a point Q on the extension line. In FIG. 9A, when the upper knife is driven, the connecting pin 84a of the moving piece 84 fits into the fork of the driving connecting arm 24. At this time, as shown in FIG. 80 further rotates in the counterclockwise direction, and the protrusion 80A separates from the drive intermediate arm 26. Therefore, the drive intermediate arm 2
6 transmits the swinging motion from the main shaft 18 to the upper knife swinging arm 28 without being restricted by the moving cam 80. When the position of the upper knife drive arm 30 when the phase of the upper knife drive is at the top dead center is represented by an R point on the extension line, the upper knife drive arm 30 swings between the Q point and the R point. The shape of the moving cam 80 is determined so that the driving intermediate arm 26 does not come into contact with the moving cam 80 at this time. In the above embodiment, the rotation of the switching lever 66
In conjunction with the operation, the connection between the upper looper drive means and the spindle is installed.
The first connecting member that can be attached and detached includes a connecting pin 44a and an upper
Oscillating arm 48. Switching lever
The upper knife driving means and the main shaft
The second connecting member capable of attaching and detaching the connection is the drive intermediate arm 2
6, a moving piece 84 and a connecting pin 84a. As described above, the overlock sewing machine of the present invention has been described based on one embodiment shown in the drawings. However, the present invention is not limited to this embodiment and can be variously modified. According to the overlock sewing machine of the present invention, at the time of sewing without using a knife, the swinging of the upper knife by the upper knife driving means is stopped by operating the release device, and the upper knife is moved upward. And the swinging of the upper looper by the upper looper driving means is stopped, and the upper looper is retracted downward. As described above, since the upper knife and the upper looper can be simultaneously retracted and stopped by operating the switching device, the operation is simple and the structure is simple.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an entire overlock sewing machine suitable for applying a release device according to the present embodiment. FIG. 2 is a perspective view of a release device according to the embodiment. FIG. 3 is an exploded perspective view of the embodiment of FIG. 2; FIG. 4 is a top view showing the switching device of the embodiment of FIG. 2; FIG. 5 is a partial side view of the present embodiment. FIG. 6 shows an enlarged view of a moving cam. FIG. 7 is a diagram showing a state of a mechanism of a main part of the embodiment when the upper knife is opened. FIG. 8 is a diagram illustrating a state of a mechanism of a main part of the present embodiment at an intermediate time (when the switching lever is moving upward or downward). FIG. 9 is a diagram illustrating a state of a mechanism of a main part of the present embodiment during driving. [Description of Signs] 2 Overlock sewing machine 4 Arm 6 Bed 8,10 Needle 12 Needle plate 14 Upper knife swing shaft 16 Moving piece support shaft 18 Main shaft 20 Upper knife drive cam 22 Upper knife drive rod 24 Drive connection arm 26 Drive middle Arm 28 Upper knife swing arm 30 Upper knife drive arm 32 Upper knife 34 Spring 36 Square sesame 38 Lower knife 40 Upper looper drive rod 42 Upper looper drive arm 44 Upper looper moving piece 44a Connection pin 46 Upper looper moving piece spring 48 Upper looper Swinging arm 48a Fork 50 Upper looper upper / lower arm 52 Upper looper slide shaft 54 Upper looper 56 Support base 58 Switching gear 60 Intermediate gear 62 Moving gear 64 Switching lever support shaft 66 Switching lever 68 Conversion arm 70 Switching lever spring 72 Connection link 74 Switching arm support shaft 76 Upper looper swing switching arm 76a Pin 78 Intermediate gear support shaft 80 Moving cam 80A Projection 8 B tip 80C rear portion 82 moves the gear shaft 84 moving piece 84a connecting pin 86 moving piece spring

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-3-143479 (JP, A) JP-A-2-142595 (JP, A) JP-A-62-16785 (JP, A) JP-A-61- 234893 (JP, A) JP-A-56-128189 (JP, A) JP-A-5-15677 (JP, A) JP-A-58-33983 (JP, Y2) JP-A-55-54468 (JP, Y2) 61-8860 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) D05B 1/00-97/12

Claims (1)

(57) An overlock sewing machine having an upper knife and an upper looper for cutting cloth and performing at least one type of sewing other than edge overlocking and edge overlocking. An upper knife driving means for swinging the knife up and down, an upper looper driving means for swinging the upper looper, and a switching lever (66) rotatably supported by a support base.
A first connecting member (44a, 48) capable of attaching and detaching a connection between the upper looper driving means and the main shaft in conjunction with a rotation operation of the switching lever; A second connecting member (26, 84, 84a) capable of mounting and disengaging the connection between the upper knife driving means and the main shaft; A moving cam (80) that comes into contact with the second connecting member (26) and can retreat the upper knife upward ;
By the rotation operation, the swinging of the upper knife by the upper knife driving means is stopped and the upper knife is retracted upward, and the swinging of the upper looper by the upper looper driving means is stopped and the upper looper is moved downward. Overlock sewing machine characterized by being evacuated to