JPH053981A - Overlock sewing machine - Google Patents

Abstract

PURPOSE:To permit the smooth operation by releasing the spring pressure to a pressing board by a springy device 32 by one operation in only pushing down an operating lever and carrying out the retreat of a pressing metal by lifting up an upper feeding tooth. CONSTITUTION:An operating lever 38 is connected with a lever 43 through a link 44, and the lever 43 is turned together with a hook lever 45 by the operation of the operating lever 38. When the hook lever 45 is turned, an upper lever 27 is turned upwardly, and an upper feeding board 2 is lifted up, and an upper feeding tooth 3 is raised on a pressing metal. The operating lever 38 is engaged with a pin 35 which is projectingly installed from a rod 37 pressed on a pressing board 8 by a spring 34, in operation, and the rod 37 is pushed up, and the pressing pressure for the pressing board 8 is released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overlock sewing machine, and more particularly to an overlock in which an upper feed mechanism for feeding cloth in cooperation with a lower feed tooth is arranged in a through hole of a presser foot. Regarding sewing machine.

[0002]

2. Description of the Related Art In an overlock sewing machine, a presser foot is generally attached to a free end of a presser foot which has a base portion which is rotatably supported by a presser foot lifting shaft in a horizontal direction, thereby eliminating threading of needles and elimination of sewing clogging. For repairs, cleaning, adjustment of the looper, etc. performed by removing the needle plate, release the spring pressure acting on the presser foot, and then swivel the presser foot with the presser foot to the side to avoid the stitch forming area. Although it does not interfere with the work described above, in an overlock sewing machine of the type that has an upper feed mechanism and the upper feed dog is arranged in the through hole of the presser foot, the upper feed dog interferes The presser foot cannot be evaded to the side. In order to be able to avoid the presser foot to the side, the upper feed dog first rises earlier by stepping on the foot pedal, and the upper feed dog moves up until it is located above the presser foot, and then the presser foot A device configured to be raised (Japanese Patent Laid-Open No. 60-53177), in which the lever is operated to release the engagement between the presser base and the mechanism for raising the base, and then only the upper feed dog is raised by stepping on the foot pedal. However, the presser foot and the upper feed dog are simultaneously raised by the stepping operation of the foot pedal, and the lever is operated to keep the upper feed tooth in the raised position only. Various types have been proposed, such as a means for lowering (Kaikai No. 59-171674), but the above-mentioned first means for avoiding the presser foot to the side is the stepping operation of the foot pedal and the presser foot. The two operations for releasing the spring pressure that act on the second are the lever operation, the stepping operation of the foot pedal and the three operations for releasing the spring pressure to the presser base for the second, and the third operation for the foot pedal. Two operations, a stepping operation and a lever operation, were required.

There is also proposed a presser foot which can be avoided by a single operation. This is the case in Japanese Patent Laid-Open No. 62-127098, in which the spring pressure acting on the presser base can be released and the upper feed dog can be raised above the presser foot by operating the operating lever.

[0004]

SUMMARY OF THE INVENTION A first object of the present invention is to further improve the above-mentioned technique in which the presser foot can be avoided by a single operation so that the operation can be performed smoothly. A second object of the present invention is to provide a space under the presser base that is wider than the conventional one so that equipment such as a chain cutter can be easily deployed.

[0005]

An overlock sewing machine for achieving the first object is provided with a presser foot attached to a presser base whose base is pivotally supported in a vertical and horizontal direction, and a presser foot. A pushing down ammunition device, an upper feed table that moves up and down and back and forth in conjunction with a main shaft, and is attached to the upper feed table and is arranged in a through hole formed in the presser foot and cooperates with a lower feed dog. In an overlock sewing machine having an upper feed dog for feeding cloth, an operating lever that engages with the ammunition device and releases spring pressure applied to the presser base by the ammunition device is connected to the operation lever by a link. , A pawl lever that rotates in conjunction with the operating lever, and a lifting lever that is pivotally supported by a presser foot lifting shaft and that engages with the upper feed table and lifts the feed table when rotating upward, integrated with the lifting lever Or interlocking with the lifting lever And having an arm for detachably locking.

In order to avoid the presser foot, the spring pressure applied to the presser base by the ammunition device is released by operating the operating lever, the pawl lever is rotated via the link mechanism, and then the arm engaging with this is lifted. Rotate the lever upward to raise the upper feed dog and then perform. An overlock sewing machine for achieving the second object is characterized in that a presser foot is pivotally supported in a horizontal direction on a crank projecting upward on a presser foot lifting shaft.

According to this sewing machine, the presser foot is lifted by the height of the crank, and the space below it is increased. This makes it easy to deploy a chain cutter or the like.

[0008]

[Embodiment] The base end is connected to the crank 1 for forward and backward feed,
As shown in FIG. 4, the upper feed table 2 which moves back and forth by the swing of the crank 1 has a trapezoidal shape that is convex upward, and the upper feed dog 3 is attached to its free end. The vertical movement mechanism of the upper feed base 2 includes a vertical feed shaft 5 that swings in conjunction with the movement of the female lever 4,
A vertical feed crank 6 fixed to the shaft end of the shaft 5,
The guide 7 is pivotally supported by the crank 6, and the upper feed table 2 is slidably fitted to the guide 7. The upper feed table 2 is lifted or lowered by swinging the crank 6.

The presser base 8 is horizontally rotatably supported by a hook-shaped crank 11 whose base end is fixed to the shaft end of the presser foot lifting shaft 9, and has a presser foot 12 at its free end. 12 through holes 1
The upper feed dog 3 is fitted in the space 3. The presser foot lifting shaft 9 is fitted into the cylindrical shaft 14, and the collar 15 is attached to the screw 16 at the protruding end thereof.
It is hugged and fixed by.

The cylindrical shaft 14 has a stepped shape, a spiral spring 17 is attached to a large diameter portion, a collar 18 is held and fixed by a screw 19, and a hook lever 21 is attached to a small diameter portion between the collars 15 and 18. The hook 21a is rotatably supported.
To the claw 22 of the collar 15 and the tongue piece 23 of the collar 18 to the bottom
The hook 21 is always biased in the clockwise direction by the action of the spiral spring 17 hung on the sewing machine frame (not shown) and the hook lever 21, so that the hook portion 21a is pushed downward by the claw 22. Is separated from the tongue piece 23.

The hook lever 21 is always urged upward by the action of the spiral spring 24, and is connected via a hook 26 to a lever 25 that is pushed down by stepping on a foot pedal (not shown). When the stepping petal is stepped on, it rotates counterclockwise against the action of the spiral spring 17, and the hook portion 21a is engaged with the claw 22 and the bottom portion is engaged with the tongue piece 23 so that the collar 15 is fixed. 9 and the cylinder shaft 14 to which the collar 18 is fixed are both rotated counterclockwise to lift the presser foot 12 together with the presser base 8, and the raising lever 27 fixed to the shaft end of the cylinder shaft 14 is rotated upward. Then, the upper feed table 2 is lifted.

The lifting lever 27 has an arm 28 projecting forward and extending laterally and projecting upward on the opposite side. The lifting lever 27 is urged clockwise by the action of a spring 29 together with the cylinder shaft 14, and a stopper 31. It can be stopped with. As shown in FIG. 4, the ammunition device 32 for pushing down the presser base 8 has a coil spring 34 arranged in the cylindrical body 33, and a pin 35 protruding through a slit 36 of the cylindrical body 33 to stop rotation in the cylindrical body. Is slidably inserted,
It is composed of a rod 37 for pushing down the presser base 8 by the action of the coil spring 34. When the operating lever 38 is pushed down from the position indicated by the chain double-dashed line in FIG.
Is engaged with the pin 34 and lifts the rod 37 to release the press on the presser base 8. Operating lever 38
Is connected via a link 44 to a lever 43 fixed to the shaft end of an operating shaft 42 at a position adjacent to a stepped screw 41 that pivotally mounts the lever 38 on a sewing machine frame, and pushes or raises the operation lever 38. Then, the lever 43 rotates clockwise or counterclockwise in the figure, and the claw lever 45 fixed to the other end of the operating shaft rotates in the same direction. Then, when it is rotated clockwise, it is engaged with the arm 28 of the raising lever 27 to rotate the raising lever 27 upward.

The overlock sewing machine of this embodiment is constructed as described above, and when the foot pedal is depressed when inserting the cloth at the time of sewing, the hook lever 21 is rotated counterclockwise to cause the collar 15 and 18 to pass through. Both the presser foot lifting shaft 9 and the cylinder shaft 14 rotate in the same direction, and the presser base 8 rotates upwards against the action of the ammunition device 32 to lift the presser foot 12 and rotate the lifting lever 27 upward. The upper feed dog 3 is lifted together with the upper feed base 2 by the movement.

When it is desired to avoid only the presser foot 12 to the side of the same sewing area, the operating lever 38 is pushed down from the two-dot chain line position in FIG. 4 to the solid line position. Then, the rod 37 is pushed up to release the spring pressure applied to the presser base 8 by the ammunition device 32, and the claw lever 45 pushes and moves the arm 28 to rotate the lift lever 27 upward so that the upper feed table 2 Lift and raise the upper feed dog 3 onto the presser foot. As a result, the presser foot 12 is not obstructed by the upper feed dog 3 and can be freely laterally avoided.

[0015]

The present invention is constructed as described above and has the following effects. According to the overlock sewing machine of claim 1, one operation of the operating lever releases the spring pressure applied to the presser base by the ammunition device, and the raising lever is turned upward to move the upper feed dog onto the presser foot. Although it can be raised, the mechanism for rotating the upper lever constitutes the crank lever mechanism including the operating lever, and there is no sliding part, and the line of action by the operating lever and the rotation center Since the distance can be increased, the operation lever can be operated smoothly. According to the overlock sewing machine of the second aspect, since the presser base is higher than the conventional one, the space thereunder is increased, and the chain cutter and the like can be easily arranged.

[Brief description of drawings]

FIG. 1 is a perspective view of an upper feed mechanism and a presser mechanism of an overlock sewing machine according to the present invention.

FIG. 2 is a perspective view of the pressing mechanism shown in FIG.

FIG. 3 is an exploded perspective view of the holding mechanism shown in FIG.

FIG. 4 is a side view of the overlock sewing machine according to the present invention.

[Explanation of symbols]

2 Upper feed bar 3 Upper feed dog 8 Presser foot 9 Presser foot lifting shaft 11 Hook type crank 12
Presser foot 14 Tube shaft 15, 18 Color 21
Hook lever 27 Lifting lever 28 Arm 32
Ammunition device 38 Operation lever 43 Lever 44
Link 45 claw lever

Claims (2)

[Claims] 1. A presser foot attached to a presser base having a base rotatably rotatably vertically and horizontally, an ammunition device for pressing down the presser base, and a vertical and forward / backward movement linked with a main shaft. In an overlock sewing machine having an upper feed table and an upper feed dog that is attached to the upper feed table and is arranged in a through hole formed in the presser foot and that feeds cloth in cooperation with a lower feed dog, An operating lever that engages with the above-mentioned ammunition device and releases the spring pressure applied to the presser base by the ammunition device, a claw lever that is connected to the operation lever by a link, and rotates in conjunction with the operation lever, and a presser foot lifting shaft. And a lift lever that is pivotally supported by the lift lever and that engages with the upper feed table to lift the feed table when rotating upward, and is integral with the lift lever or is interlocked with the lift lever and can be detached from the claw lever. An overlock having an engaging arm sewing machine. 2. The overlock sewing machine according to claim 1, wherein the presser foot is axially attached to a crank projecting upward from the presser foot lifting shaft so as to be horizontally rotatable.