JPS62127098A - Overlock sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an Operlock sewing machine equipped with an upper feed dog which is disposed in a through hole of a presser foot and feeds cloth in cooperation with a lower feed dog.

In prior art overlock sewing machines, the presser foot is generally attached to the free end of the presser foot, which is pivotally supported on the base for vertical and horizontal pivoting, and is used for threading needles, clearing jams, and closing the throat plate. When removing the presser foot for repairs, cleaning, adjustment of the looper, etc., release the spring pressure acting on the presser foot, then rotate the presser foot to the side together with the presser foot to avoid the seam forming area, and then remove the presser foot from the seam forming area. However, with overlock sewing machines that are equipped with an upper feed mechanism and the upper feed dog is placed inside the presser foot's through hole, the upper feed dog becomes a hindrance and the presser foot cannot be moved as it is. Cannot be evaded to the side. In order to be able to avoid the presser foot laterally, until now, when the foot pedal was depressed, the upper feed dog first rose first, and the upper feed dog rose until it was located above the presser foot, and then the presser foot was raised. (Unexamined Japanese Patent Publication No. 6)
No. 0-53177), in which only the upper feed dog is raised by depressing the foot pedal after the presser foot and the mechanism for raising the presser foot are released by operating the lever (Utility Model No. 58- No. 190975), the presser foot and upper feed dog are simultaneously raised by pressing the foot pedal, and only the presser foot is lowered while maintaining the upper feed dog in the raised position by operating the lever. 59-17
Various methods have been proposed, such as No. 1674), but all of them require two or two operations to avoid the presser foot laterally. In other words, in the first case, the two operations of pressing the foot pedal and releasing the spring pressure acting on the presser foot are
The second one requires two operations: operating the lever, pressing the foot pedal, and releasing the spring pressure on the presser foot; the third one requires two operations: pressing the foot pedal and operating the lever. That's how it is.

Problems to be Solved by the Invention The present invention is an overlock sewing machine of the type in which the upper feed dog is disposed in the through hole of the presser foot, in which the presser foot can be avoided laterally by -operation.

Means for solving the problem, that is, the present invention is a presser foot attached to a presser foot whose base is rotatably supported vertically and horizontally, an elastic device that presses down the presser foot, and an elastic device that is interlocked with the main shaft. an upper feed table that moves up and down and back and forth, and an upper feed dog that is attached to the upper feed table and placed in a through hole formed in the presser foot to feed the cloth in cooperation with the lower feed dog. In an overlock sewing machine having
a manual operating member; and a lever rotatably supported around a horizontal axis that engages with the upper feed bar to lift the feed bar when pivoted upward; The present invention is characterized by comprising a mechanism that is activated to rotate the lever upward and release the spring pressure applied to the presser foot by the elastic device.

Embodiment An arm 2 is fixed to one end of the presser foot lifting shaft 1, and the arm is connected to a foot pedal (not shown) via a chain, and when the foot pedal is depressed, the presser foot lifting shaft 1 is
is designed to rotate in the forward or reverse direction. A collar 4 is rotatably attached to the other end of the presser foot lifting shaft l protruding from the frame 3, and a presser foot lifting lever (
(not shown) is fixed, and the collar 4 is sandwiched from both sides by the presser foot lifting lever and a clamping fitting I2, which will be described later, which is fastened to the presser foot lifting shaft l, thereby restricting movement in the axial direction. A presser foot 5 is pivotally attached to the collar 4 so as to be rotatable in the horizontal direction.

Thus, the presser foot 5 is supported so as to be rotatable vertically and horizontally about the presser foot lifting shaft 1, and a presser foot 6 is attached to the free end, and an elastic band is attached to the upper surface near the free end. The mechanical device 7 acts, thereby pressing down the presser foot 5 and pressing the presser foot 6 against the throat plate 8. Presser foot lifting shaft 1
The presser foot lifting lever, which is fixed to the shaft end of the presser foot, normally has its free end located below a horizontal projection (not shown) that projects from the presser foot 5, but the presser foot lifting shaft 1 is located counterclockwise in the figure. When the presser foot 5 is rotated in the direction, it engages the horizontal protrusion from below and lifts the presser foot 5 against the action of the bullet device 7, thereby raising the presser foot 6 above the throat plate.

A lever 9 is rotatably supported on the presser foot lifter shaft 1 at its intermediate portion, and a leaf spring 11 is applied to one end surface of the upper side of the lever 9 to prevent the lever 9 from moving counterclockwise in the figure. The other end surface of the upper side of the lever that performs the regulating action is a stepped portion, and a pin 13 protruding parallel to the presser foot lifting shaft 1 from the clamping fitting 12 fastened to the presser foot lifting shaft 1 is attached to the step. The presser foot lifting shaft 1 is engaged with the lower stepped part of the
A roller 16 is engaged with an end of an arm 15 that is fixed to one end of a horizontal shaft 14 that is supported parallel to the presser foot. Horizontal axis 1
The clockwise rotation of the lever 4 causes the lever 9 to rotate counterclockwise against the spring pressure of the temporary spring 11. The lever 9 also has a roller 17 pivotally attached to its lower end, and the roller is located below an upper feed table 18 (described later), and is engaged with the upper feed table 18 by rotating the lever 9 in the counterclockwise direction. The upper feed table is then lifted up.

The upper feed table 18 has a crank 21 fixed to the upper feed front and back shaft 19.
An upper feed dog 22 is attached to the free end of the presser foot 6. The upper feed dog 22 moves back and forth due to the swinging motion of the presser foot 6, and is fitted into the through hole of the presser foot 6. Then, a bullet device 23 acts on the appropriate position on the upper surface to push down the upper feed table 18, and in cooperation with the vertical swing of the crank pin 24, the upper feed table 18 is swung up and down. ing.

Frame 3 of the horizontal shaft 14 with an arm 15 fixed to one end
One end of the link 25 is fixed to the other end that protrudes more, and a long hole 26 is formed in the other side of the link 25, and the stepped screw 2
7 is fixed to the middle part of an operating lever 28 which is pivoted to the side wall of the frame through a long hole 26.

The stepped screw 27 has an eccentric shaft portion that slidably fits into the elongated hole 26. Therefore, when the stepped screw 27 is turned, the link 25 slightly moves up and down about the horizontal shaft 14. As a result, the arm 15 moves slightly from side to side to adjust the position of the roller 16.

The operating lever 28 is biased clockwise in the figure by a helical spring pressure 30 attached to a stepped screw 29 that pivots the lever, and has a hook portion 31 protruding to the side of the stepped screw 29 at the lower end. The hook portion 31 is always located below the pin 32 that protrudes from the side of the ammunition device 7. When the upper part of the operating lever is pushed against the action of the helical spring 30 and the lever 28 is rotated counterclockwise, the hook part 31 is moved against the pin 32.
The pin 32 is engaged with the pin 32 and the action of the bullet device 7 on the presser foot 5 is released.

Rotation of the operating lever 28 in the counterclockwise direction is also caused by the link 25
The arm 15 is rotated clockwise via the lever 9, thereby the lever 9 is rotated counterclockwise while bending the temporary spring 11, and the upper feed table 18 is lifted.

Function This device is constructed as described above, and when inserting cloth during sewing, depress the foot pedal and rotate the presser foot lifting shaft l counterclockwise in the figure, and the presser foot 5 is activated by the action of the elastic device 7. The presser foot 6 is raised against the needle plate. At the same time, the lever 9 is rotated counterclockwise in the figure by the pin 13 that rotates together with the presser foot lifting shaft l, and the upper feed table 18 is lifted against the action of the elastic device 23, and the upper feed dog 22 to rise.

If you want to avoid only the presser foot from the seam forming area,
Press the upper part of the operating lever to rotate the lever 28 counterclockwise in the figure. As a result, as described above, the presser foot 5
The spring pressure of the ammunition device 7 is released, and at the same time the upper feed table 1
8 is lifted against the action of the bullet device 23, raising the upper feed dog 22 onto the throat plate. At this time, the presser foot 6 remains placed on the throat plate, and can be freely moved aside when the upper feed dog 22 is raised onto the presser foot.

Effects of the Invention According to the present invention, as described above, by operating the operating member in one direction, the spring pressure acting on the presser foot can be released and the upper feed dog can be raised above the presser foot. , so that the presser foot can be evaded laterally in the -operation.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a main mechanism of an overlock sewing machine according to the present invention, and FIG. 2 is an exploded perspective view of the same mechanism.

Claims (1)

[Claims] A presser foot attached to a presser foot whose base is rotatably supported vertically and horizontally, an elastic device that presses down the presser foot, and an upper feed table that moves up and down and back and forth in conjunction with the main shaft. A manual operation member; ,
A lever is rotatably supported around a horizontal axis, and includes a lever that engages with the upper feed bar to lift the feed bar when pivoted upward, and is actuated by operation of the manual operating member to cause the lever to an overlock sewing machine having a mechanism for rotating the presser foot upward and releasing the spring pressure applied to the presser foot by the elastic device.