JP3841954B2 - Overlock sewing machine - Google Patents

Description

[0001]
[Industrial application fields]
According to the present invention, in an overlock sewing machine, that is, a sewing machine that shares both functions of an edge stitch sewing machine and a double chain stitch sewing machine, the swing angles of both loopers can be made substantially the same, and the structure can be extremely simplified. It relates to overlock sewing machines.
[0002]
[Prior art]
In the conventional overlock sewing machine, in order to drive the lower looper and the double ring looper for edge stitching, a lower looper shaft and a double ring looper shaft for supporting each looper are required. The double ring looper shaft itself has a swing motion and a back and forth motion (hereinafter referred to as “the former”), or a lower looper shaft and a double ring looper shaft are provided to move back and forth. There is an application (Japanese Patent Application No. 4-262687, hereinafter referred to as “the latter”) that swings only with a double ring looper and swings the lower looper through the double ring looper. Was.
[0003]
Since the positions of both shafts are accompanied by a drive mechanism including the respective bearings, they are spaced apart from each other. In an overlock sewing machine, the distance between the needles is 2 to 2 in relation to the gauge width inherent to the sewing machine. It is set at about 8 mm. By arranging the lower looper shaft position suitable for the movement trajectory of the lower looper and the double ring looper shaft position suitable for the double ring looper track in relation to the needle position, both drive mechanisms do not interfere with each other. It was difficult to place them close together.
[0004]
[Means for Solving the Problems]
For this reason, as shown in Japanese Patent Publication No. 57-5554, the former has been proposed in which a double ring looper shaft is disposed in a lower looper shaft. However, on the other hand, high accuracy is required for each component of this device, and therefore high accuracy is required. However, in reality, there is a disadvantage that the structure is complicated and the cost is increased, and in the latter case, the structure is not complicated and the assembly is good, but the swinging of the lower looper and the double ring looper is good. The lower looper and the double ring looper shaft are moved with reference to the lower looper shaft, and the lower looper swings the lower looper through a protrusion etc. from the middle position of the double ring looper. Swing angle with looper There were differences, and the swing range is a disadvantage of different like.
[0005]
[Means for Solving the Problems]
Therefore, as a result of earnest and research, the inventor has made the present invention a lower ringer that operates with a lower looper corresponding needle that moves up and down and a double ring that operates with a double ring looper corresponding needle. In an overlock sewing machine in which a looper is juxtaposed, a lower looper swinging arm with a locking portion having a swing center fixed on the lower looper drive shaft, and the lower looper drive shaft close to the lower looper swinging arm Fixed to the double ring looper moving shaft, the double ring looper moving shaft provided parallel to the lower looper driving shaft, and the double ring looper moving shaft , An overlock sewing machine comprising a forward / backward movement holding rod for holding the front / rear position of the double ring looper rocking arm, and the locking portion can be always locked to the double ring looper rocking arm. Both The swing angle of over substantially the same, and can be very simple to its structure, it is obtained by solving the above problems.
[0006]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A lower looper-corresponding needle 1 that moves up and down and a double ring looper-corresponding needle 2 are provided, and a lower looper 3 that operates together with the lower looper-corresponding needle 1 and A double ring looper 4 is attached and an upper looper is attached to the main body, which is omitted in the drawing.
[0007]
As shown in FIGS. 1 (A) and 5 (A), the lower looper 3 is steeply inclined from the middle of the main body 5 of the lower looper swinging arm A (inside and outside about 80 degrees with respect to the horizontal). It is fixed to the protruding portion 6 projecting to the position with screws or the like. A shaft piece mounting hole 5a is formed at the distal end portion of the main body 5 and a shaft hole 5b having a split groove is formed at the center of the base portion.
[0008]
As shown in FIGS. 1 and 2, the shaft hole 5 b of the lower looper swing arm A is fixed to the lower looper drive shaft 7 and is configured to be swingable via a main shaft 30. The lower looper drive shaft 7 is pivotally supported by a lower fixed portion in the sewing machine body so as to be rotatable (swingable). A double ring looper moving shaft 8 is provided in parallel with the lower looper drive shaft 7 slightly below the lower looper drive shaft 7. As shown in FIGS. 1 to 3 and the like, the double ring looper moving shaft 8 only reciprocates in the axial direction, and its structure is fixed to a main shaft 30 provided in the sewing machine body. As shown in FIG. 2, an advance / retreat operating rod 32 is attached to the eccentric cam 31, and the operation of the advance / retreat operation rod 32 causes the double ring looper moving shaft 8 to reciprocate in the axial direction (front-rear direction). It is configured to move.
[0009]
On the lower looper drive shaft 7, the swing center of the double-loop looper swing arm B is in the axial direction in the vicinity of the lower looper swing arm A (the left-right direction in FIG. 2 is referred to as the front-rear direction). Is slidably provided. Specifically, the lower side portions of the longitudinal movement holding rods 9 and 9 are fixed to appropriate positions on the double-ring looper moving shaft 8 (positions of the double-ring looper swinging arm B), The double ring looper swinging arm B is held by the front and rear movement holding rods 9 so as to wrap the front and rear. A bifurcated portion 9 a is formed at the upper end of the forward / backward movement holding rod 9, and the bifurcated portion 9 a wraps the lower looper drive shaft 7 and holds the double ring looper swing arm B. Accordingly, when the double ring looper moving shaft 8 is moved back and forth, the double ring looper swinging arm B with the double ring looper 4 is moved back and forth via the both front and rear movement holding rods 9 and 9. Has been.
[0010]
As shown in FIG. 3B, a square piece sliding groove 11 is formed in the main body 10 of the double ring looper swing arm B, and the square piece sliding groove 11 is moved in the sliding direction of the groove. A mounting groove 12 is formed facing the direction of about 45 degrees, and the double ring looper 4 is fixed to the mounting groove 12. The tip shaft portion 13a of the eccentric shaft piece 13 is fixed to the shaft piece mounting hole 5a at the tip portion of the main body portion 5 of the lower looper swing arm A with a screw 5c. The eccentric shaft piece 13 is formed with a base-side shaft portion 13b on the base-side flange portion 13c side, and the distal end shaft portion 13a is integrally formed continuously therewith. The distal end shaft portion 13a and the base portion side shaft portion 13b are slightly eccentric (about 0.5 mm). A hole of a square-shaped square piece 14 is inserted into the base-side shaft portion 13b, and the square piece 14 is rotatably attached to the main body portion 10 of the double ring looper swinging arm B. The square piece 14 is configured to engage with the square piece sliding groove 11 of the double ring looper swing arm B. That is, the double ring looper swinging arm B is configured to maintain the engaged state between the square piece 14 and the square piece sliding groove 11 even when swinging and sliding in the front-rear direction. In addition, by appropriately rotating the eccentric shaft piece 13 from the front side of the sewing machine, it is possible to adjust the position where the swing of the double ring looper 4 starts or ends.
[0011]
First, when the sewing machine is driven, the lower looper swing arm A with the lower looper 3 swings at an appropriate angle by the swing of the lower looper drive shaft 7. At the same time, the double ring looper moving shaft 8 moves back and forth in the front-rear direction, so that the double ring looper swing arm B with the double ring looper 4 moves back and forth via the front and rear movement holding rods 9 and 9. Even during this back-and-forth movement, the square piece 14 attached to the lower looper swinging arm A and the square piece sliding groove 11 of the double ring looper swinging arm B are engaged, and the lower looper swinging arm B is engaged. Simultaneously with the looper swing arm A, the double ring looper swing arm B swings within the same swing angle range. Thus, the lower looper swinging arm A with the lower looper 3 swings at an appropriate angle, and the double looper swinging arm B with the double ring looper 4 swings at an angle within the same range as this swinging angle. In addition, only the double-loop looper swinging arm B with the double-loop looper 4 moves back and forth. By this back-and-forth movement and swing, the double ring looper 4 operates so as to have an elliptical orbit when viewed from above, and only the lower looper 3 swings so as to be a straight line when viewed from above.
[0012]
In another embodiment, as shown in FIGS. 7 (A), (B) and (C), the square piece 14 is simply used as a shaft piece-like locking portion 15 and the lower looper swinging arm A is moved. A square piece sliding groove 11 fixed to the tip of the main body portion 5 and formed in the main body portion 10 of the double ring looper swing arm B is used as a locked portion 16 to be locked to the locking portion 15. The double-loop looper swinging arm B with the double-loop looper 4 is moved back and forth through the both longitudinal movement holding rods 9 and 9 formed. The locking portion 15 is configured to be locked to the locked portion 16 even when moving back and forth. Other configurations are the same as those of the first embodiment described above, the same reference numerals are given, and the description thereof is omitted.
[0013]
【The invention's effect】
In the overlock sewing machine in which the lower looper 3 that operates with the lower looper corresponding needle 1 that moves up and down and the double ring looper 4 that operates with the double ring looper corresponding needle 2 are arranged in parallel, the lower looper drive shaft A lower looper swing arm A with a locking portion 15 having a swing center fixed on 7 and provided on the lower looper drive shaft 7 so as to be swingable in the vicinity of the lower looper swing arm A and movable back and forth. The double ring looper swinging arm B, the double ring looper moving shaft 8 provided in parallel to the lower looper drive shaft 7, and the double ring looper fixed to the double ring looper moving shaft 8 By using an over-lock sewing machine that includes forward / backward movement holding rods 9 and 9 that hold the front / rear position of the swing arm B, and the locking portion 15 can always be locked to the double ring looper swing arm B. First, uniaxial down Simplify the structure by directly driving the swinging motion of the super 3 and the double ring looper 4, and obtain the stable elliptical motion of the double ring looper with little transmission loss. Second, there is an effect that the swing range of the lower looper 3 and the double loop looper 4 can be made substantially the same, and desired lock sewing can be performed.
[0014]
In detail, the lower looper 3 and the double ring looper 4 both have the lower looper drive shaft 7 as a swing center, and the double loop looper 4 is a locking portion 15 against the swing of the lower looper 3. Therefore, the swing angle and the swing range of both are the same, and a good action can be exhibited.
[0015]
Further, even if the lower looper driving shaft 7 and the double ring looper moving shaft 8 are provided, the swinging is only the lower looper driving shaft 7, and the double ring looper moving shaft 8 is driven only in the forward / backward direction. Even if the distance between the looper drive shaft 7 and the double ring looper moving shaft 8 is different, it can be driven directly by swinging the lower looper drive shaft 7 as a single axis, and can be made stable with little transmission loss. Can be remarkably simplified, and there is an advantage that the assembly can be performed easily and quickly.
[0016]
Next, in claim 2, in claim 1, the locking portion 15 is a square piece 14, and the square piece 14 is formed on the double ring looper swinging arm A via an eccentric shaft piece 13. By using the overlock sewing machine attached to the piece sliding groove 11, particularly when the square piece 14 is slid into the square piece sliding groove 11, surface contact is made, and the square piece 14 is excellent in wear resistance and eventually durable. Furthermore, since the square piece 14 is attached to the square piece sliding groove 11 formed in the double ring looper swinging arm A via the eccentric piece 13, the eccentric shaft By appropriately rotating the piece 13, it is possible to adjust the start or end location of the swinging of the double ring looper 4, and there is an effect that the capturing can be made better.
[Brief description of the drawings]
FIG. 1A is a perspective view of a main part of the present invention in a separated state. FIG. 2B is a state diagram of a longitudinal movement related member. FIG. 2 is a front view of a main part of the present invention. FIG. 4B is an exploded perspective view of the main member of the present invention. FIG. 4A is a schematic view showing that the lower looper swing arm and the double ring looper swing arm are in close contact with each other. In the state diagram (B) where the frame and the square piece sliding groove are locked, the lower looper swing arm and the double ring looper swing arm are slightly separated, and the square piece and the square piece slide groove are locked. [FIG. 5] (A) is a side view of a partial cross-section in which a lower looper swinging arm with a lower looper is fixed to a lower looper drive shaft. (B) is a double ring looper with a double ring looper. FIG. 6 is a perspective view of a partially looped lower looper swing arm provided with a square piece. FIG. 7A is another embodiment of the present invention. The fruit A perspective view (B) of a lower looper swinging arm with a locking portion in the form is a perspective view (C) of a double ring looper swinging arm of another embodiment of the present invention, and a locking view of another embodiment of the present invention. Sectional view showing the locking state between the locking part and the locking hole in the lower looper swinging arm with part and the double ring looper swinging arm.
A ... Lower looper swing arm B ... Double looper swing arm 1 ... Lower looper compatible needle 2 ... Double loop looper compatible needle 3 ... Lower looper 4 ... Double loop looper 7 ... Lower looper drive shaft 8 ... Double Ring looper moving shaft 9... Longitudinal movement holding rod 11. Square piece sliding groove 13. Eccentric shaft piece 14. Square piece 15.

Claims (2)

In an overlock sewing machine that has a lower looper that moves with a lower looper compatible needle that moves up and down and a double ring looper that operates with a double loop looper compatible needle, the lock center is fixed on the lower looper drive shaft. A lower looper swing arm with a portion, a double ring looper swing arm provided on the lower looper drive shaft so as to swing and move back and forth in the vicinity of the lower looper swing arm, and the lower looper drive shaft A double ring looper moving shaft provided parallel to the double ring looper moving shaft, and a forward / backward movement holding rod fixed to the double ring looper moving shaft for holding the front / rear position of the swinging arm of the double ring looper. An overlock sewing machine characterized in that the engaging portion can be always engaged with a swinging arm of a heavy looper. The overhang according to claim 1, wherein the locking portion is a square piece, and the square piece is attached to a square piece sliding groove formed on the double ring looper swinging arm via an eccentric shaft piece. Rock sewing machine.

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