JP3653797B2 - Edge sewing machine - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an edge-locking sewing machine having a looper that is swung in synchronization with a needle that moves up and down.
[0002]
[Prior art]
Conventionally, as the overedge sewing machine as described above, there is a sewing machine that is described in the real Hei 6-52775 JP. In the sewing machine, a cam that is eccentric in a direction perpendicular to the axial direction is fixed to a drive shaft that drives the sewing needle in the vertical direction, and a lot that extends in the vertical direction is slidably attached to the cam. To move up and down. Then, the lot is connected to the shaft member via a link connecting member so as to rotate and swing the shaft member arranged horizontally, and the lot and the link connecting member are connected with a screw or the like using a tool. It was. A looper or a member to which the looper is fixed is attached to the shaft member, and the looper swings in synchronization with the vertical movement of the sewing needle. In addition, the upper looper and the lower looper are configured to be swung by separate cams.
[0003]
[Problems to be solved by the invention]
However, in the above-described configuration, the shaft member and the lot are linked with a set screw or the like using a tool or the like, so that there is a problem that it takes time to assemble the sewing machine. Further, since separate cams and link connecting members are provided to swing the lower looper and the upper looper, there are problems that the number of parts increases, the mass of the sewing machine increases, and the size of the sewing machine increases.
[0004]
The present invention has been made to solve the above-described problems, and provides a sewing machine that simplifies the driving of the upper looper and the lower looper, further simplifies the swinging mechanism of the looper, and is reduced in size. It is in.
[0005]
[Means for Solving the Problems]
In order to achieve this object, the edge sewing machine according to claim 1 of the present invention includes a moving member that has two racks and is moved in synchronization with the needle, and a gear that is rotated by the two racks. a looper and a lower looper order to swing synchronously by the respective gear to the needle, the two racks provided on the opposite face each other of the moving member, is disposed so as to sandwich the moving member in each gear.
[0006]
In addition, the edge overlock sewing machine according to claim 2 has a biasing member that applies a biasing force to the moving member.
[0007]
[0008]
[Action]
In the edge overhang sewing machine according to the first aspect of the present invention having the above-described configuration, the moving member moves together with the rack in synchronization with the needle. The gear rotates in synchronization with the needle by the rack. The upper looper and the lower looper are swung in synchronization with the needle by a gear.
[0009]
In the edge overlock sewing machine according to claim 2, the biasing member applies a biasing force to the moving member .
[0010]
[0011]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0012]
A main shaft 1 (drive shaft) for driving the sewing needle N up and down is freely attached to the main body 3 and is not movable in the axial direction so that the looper drive cam 5 rotates integrally with the main shaft 1. It is fixed. The looper drive cam 5 is formed with a groove cam 5 a that meanders in the axial direction of the main shaft 1. Further, a link 7 extending in the vertical direction is attached to the main body 3 through a shaft 9 extending in the front-rear direction so as to freely swing. At the upper end of the link 7, the shaft 11 protrudes toward the rear of the sewing machine and engages with the groove cam portion 5 a of the looper drive cam 5. An oblong hole extending in the longitudinal direction of the link 7 is formed at the lower end of the link 7.
[0013]
A shaft 15 extending in the front-rear direction at the right end of the moving member 13 is inserted into the oblong hole of the link 7 so as to be freely movable along the oblong hole. On the left end side of the moving member 13, rack portions 13b and 13a are formed on the upper surface and the lower surface. The rack portion 13 b of the moving member 13 is on the upper surface of the moving member 13 and engages with the upper looper driving gear 17, and the rack portion 13 a is on the lower surface of the moving member 13 and engages with the lower looper driving gear 19. Thus, the moving member 13 is supported by the upper looper driving gear 17 and the lower looper driving gear 19 so as to be movable in the left-right direction so as to be movable in the left-right direction. A spring 21 is attached to the center of the moving member 13 on the right side of the engagement point between the moving member 13 and the lower looper drive gear 19, and the urging force that the moving member 13 is rotated clockwise around the engagement point. Is energized. The other end of the spring 21 is attached to the main body 3 so as to swing following the movement of the moving member 13 in the left-right direction.
[0014]
The upper looper driving gear 17 is fixed to an upper looper shaft 23 that extends in the front-rear direction. An upper looper 25 is crimped to the upper looper shaft 23 so as to rotate integrally. The lower looper drive gear 19 is fixed to a lower looper shaft 27 extending in the front-rear direction. A lower looper 29 is crimped to the lower looper shaft 27 so as to rotate integrally. The upper looper shaft 23 and the lower looper shaft 27 are rotatably attached to the main body 3 in parallel with each other.
[0015]
Next, the operation of the edge sewing machine configured as described above will be described.
[0016]
As the main shaft 1 rotates, the looper drive cam 5 rotates, and the link 7 swings in the left-right direction about the shaft 9 by the groove cam 5a, and the moving member 13 is moved in the left-right direction. The upper looper drive gear 17 is rotated by the rack portion 13 b of the moving member 13, and the upper looper 25 is swung in the left-right direction via the upper looper shaft 23. At the same time, the lower looper drive gear 19 is rotated by the rack portion 13 a and the lower looper 29 is swung in the left-right direction via the lower looper shaft 27. The upper looper 25 and the lower looper 29 are moved toward and away from the sewing needle N at the respective phases and strokes to form an overlock seam on the cloth.
[0017]
In the embodiment described above, the engagement backlash between the rack portions 13a and 13b of the moving member 13 and the upper looper driving gear 17 and the lower looper driving gear 19 is eliminated by the spring 21, and the noise and vibration of the sewing machine are reduced. In the embodiment described above, the shaft member (upper looper shaft 23, lower looper shaft 27) serving as the swing center of the swinging member (upper looper 25, lower looper 29) to be swung and the main shaft 1 as the drive shaft. The movable member 13 for transmitting the power from the rack is connected by the engagement between the rack and the gear. Therefore, in comparison with the conventional sewing machine in which the shaft member and the moving member 13 are connected by a tool such as a screw, the sewing machine of this embodiment can easily connect the shaft member and the moving member without using a tool. Further, in the above-described embodiment, the upper looper shaft 23 and the lower looper shaft 27 are rotated by the common moving member 13, and therefore, in this embodiment, the number of parts is larger than that of the conventional configuration transmitted by separate members. Reduction and downsizing of the sewing machine are attempted. In the embodiment described above, the moving member 13 having a rack is sandwiched by two gears from both the upper and lower directions, and the position of the moving member 13 is restricted, so that the separation between the moving member 13 and the gear is prevented. .
[0018]
【The invention's effect】
As is clear from the above description, in the edge sewing machine according to claim 1 of the present invention, the rack of the moving member and the gear are connected by engagement, so that these members can be easily connected. it can.
[0019]
Further, in the edge overlock sewing machine according to claim 1 of the present invention, since the upper looper and the lower looper are rotated in common by the moving member, the number of parts is reduced, the looper swing mechanism is simplified, and The sewing machine is downsized.
Further, since the two racks are provided on the opposite surfaces of the moving member and are arranged so that the moving member is sandwiched between the respective gears, separation between the moving member and the respective gears is prevented.
[0020]
In addition, the edge overlock sewing machine according to claim 2 of the present invention has a biasing member that applies a biasing force to the moving member, so that the engagement play between the two racks and the respective gears is eliminated. Noise and vibration are reduced.
[Brief description of the drawings]
FIG. 1 is an overall front view showing positions of an upper looper and a lower looper according to an embodiment of the present invention.
FIG. 2 is a front view showing the mechanism of the embodiment of the present invention.
[Explanation of symbols]
1 Main shaft 5 Looper drive cam 7 Link 13 Moving member 17 Upper looper drive gear 19 Lower looper drive gear 25 Upper looper 29 Lower looper

Claims (2)

In an edge-bound sewing machine having a looper that is swung in synchronization with a needle that moves up and down,
A moving member having two racks and moved in synchronization with the needle;
Respective gears rotated by the two racks;
An upper looper and a lower looper that swing in synchronization with the needle by the respective gears ;
The edge rack sewing machine characterized in that the two racks are provided on opposite surfaces of the moving member and are arranged so as to sandwich the moving member by the respective gears . The edge-locking sewing machine according to claim 1, further comprising an urging member that applies an urging force to the moving member .

Images