JPH0716374A - Upper knife-releasing device for over-locking sewing machine - Google Patents

Abstract

PURPOSE:To provide an upper knife-releasing device which can retract upward and stop an upper knife-rocking member when a double loop sewing and special purpose sewing are performed. CONSTITUTION:For an over-locking sewing machine which performs an over- edge chain-stitch and at least one kind of sewing other than the over-edge chain stitch, an upper knife-releasing device is equipped with an upper knife rocking arm 26 which is attached to an upper knife 30 to cut a cloth, upper knife-rocking shaft 28 which is fixed on the upper knife-rocking arm and rotatably supported, controller shaft 50, and a guide groove 52a. Then, the upper knife-releasing device is also equipped with a controller 52 which can rotate around the controller shaft, link mechanisms 38, 34 which have one end to perform a linear reciprocating motion along the guide groove and the other end being fixed to the upper knife-rocking shaft, controller-rotating means which controls the angle of rotation of the controller in such a manner that the upper knife-rocking shaft may rotate when the knife is used, and the upper knife-rocking shaft may not rotate when the knife is not used, and a controller shaft-moving means to retract the upper knife upward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper knife release device for an overlock sewing machine, and particularly to overedge stitching and sewing other than overedge stitching (for example, double chain stitch and flat stitch).
The present invention relates to an upper female release device for an overlock sewing machine that performs

[0002]

2. Description of the Related Art When overedge sewing is performed by an overlock sewing machine, the sewing is performed while the cloth is being cut by sliding the upper knife and the lower knife. It is known that an upper knife is supported by a moving arm, and the upper knife swinging arm is driven up and down by an upper knife driving means using a main shaft of a sewing machine as a driving source.

By the way, when overedging with cloth cutting is performed,
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, place the upper knife above the needle plate surface. It is necessary to release and make cloth cutting ineffective.

For this reason, conventionally, the upper knife is rotatably supported via the upper knife swing arm between an acting position where the upper knife acts on the lower knife and an inoperative position where the upper knife is separated from the lower knife, and double chain stitching and special sewing are performed. In this case, the upper knife is locked by rotating it to the inoperative position.

[0005]

In the above prior art, even if the upper knife swing arm is rotated with respect to the upper knife swing arm and is separated from the lower knife, the upper knife swing arm remains rotated. However, it is dangerous when working on the sewing machine table, and the upper knife swing arm interferes with the work, resulting in a narrow working space. For this reason, it becomes difficult to perform operations such as threading and replacing needles.

Therefore, according to the present invention, a link mechanism for swinging the upper knife swing arm and an adjuster having a guide groove are used, and one end of the link mechanism is reciprocated along the guide groove to form a double ring. An object of the present invention is to provide an upper knife release device capable of stopping the upper knife swing arm by adjusting the rotation angle of the adjuster so that the upper knife swing shaft does not rotate when performing sewing and special sewing. And

Another object of the present invention is to provide an upper knife release device which is safe and widens the working space by moving the adjuster to retract the upper knife swing arm upward. It is in.

[0008]

In order to achieve the above object, an upper knife release device according to the present invention is used for cutting cloth in an overlock sewing machine which performs overedging and at least one type of sewing other than overedging. An upper knife swing arm to which a knife is attached, an upper knife swing shaft fixed to the upper knife swing arm and rotatably supported, an adjuster shaft, and a guide groove. An adjusting device that is rotatable about the center of the guide, a link mechanism that has one end that reciprocates almost linearly along the guide groove, another end that is fixed to the upper knife swing shaft, and a sewing machine that uses a knife. Sometimes, the upper knife swing shaft rotates, and adjuster rotating means for adjusting the rotation angle of the adjuster so that the upper knife swing shaft does not rotate during sewing without using a knife. .

Further, the upper knife releasing device according to the present invention includes an upper knife swing arm to which an upper knife for cutting cloth is attached in an overlock sewing machine which performs at least one type of sewing other than overedging and overedging. An upper knife swing shaft fixed to the upper knife swing arm and rotatably supported, an adjuster shaft, and a guide groove, and an adjuster rotatable about the adjuster shaft, A link mechanism having one end for performing substantially linear reciprocating motion along the guide groove, a link mechanism having the other end fixed to the upper knife swing shaft, and the upper knife swing arm downward when sewing using a knife, The sewing machine is characterized by further comprising: adjuster shaft moving means capable of moving the adjuster shaft so as to retract the upper knife swing arm upward during sewing without using a knife.

Further, the upper knife releasing device according to the present invention includes an upper knife swing arm to which an upper knife for cutting cloth is attached in an overlock sewing machine which performs at least one type of sewing other than overedging and overedging. An upper knife swing shaft fixed to the upper knife swing arm and rotatably supported, an adjuster shaft, and a guide groove, and an adjuster rotatable about the adjuster shaft, A link mechanism having one end that reciprocates almost linearly along the guide groove, a link mechanism having the other end fixed to the upper knife swing shaft, and the upper knife swing shaft rotates when sewing using a knife, An adjusting device rotating means for adjusting the rotating angle of the adjusting device so that the upper knife swinging shaft does not rotate when sewing without using a knife,
Adjuster shaft moving means capable of moving the adjuster shaft so as to retract the upper knife swing arm downward when sewing using a knife, and retract the upper knife swing arm upward when sewing without using a knife. And a switching lever for simultaneously operating the adjuster rotating means and the adjuster shaft moving means.

[0011]

In the upper knife release device according to the first aspect of the present invention, when sewing without using a knife, the adjuster rotating means rotates the adjuster around the adjuster shaft so that the upper knife swing shaft does not rotate. To Therefore, the upper knife swinging swing arm does not rotate and stops.

In the upper knife releasing device according to the second aspect of the present invention, during sewing without using a knife, the adjuster shaft moving means moves the adjuster shaft, and the link mechanism rotates the upper knife swing shaft. As a result, the upper knife swing arm retracts upward.

In the upper knife releasing device according to the third aspect of the invention, during sewing without using a knife, the upper knife swinging and swinging arm is stopped and retracted upward simultaneously by operating the switching lever.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an upper knife release device of an overlock sewing machine of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the entire overlock sewing machine suitable for applying the upper knife release device according to this embodiment. The overlock sewing machine 2 includes an arm 4 and a bed 6. Two needles 8 and 10 are provided on the arm 4 so as to be movable up and down, and a needle plate 12 is provided on the bed so as to be located below the needles 8 and 10.

FIG. 2 is a perspective view of the upper knife releasing device according to this embodiment, FIG. 3 is an exploded perspective view of this embodiment, and FIG. 4 is a perspective view showing a main part of a sewing machine incorporating the embodiment of FIG. , Shows the state when the upper knife is driven. 2 and 4 show a state in which the upper knife release device can perform overedging in an inoperative state.

In these figures, an upper knife drive cam 16 is fixed to the main shaft 14, and the upper knife drive cam 16 is fixed.
The upper knife drive rod 18 is connected. An upper knife driving rod connecting pin 20 is inserted into the upper end of the upper knife driving rod 18, and a square sesame 22 is fixed to the upper knife driving rod connecting pin 20. Needle bar drive rod 2 on the main shaft
4 are connected.

The upper knife swing arm 26 has an upper knife swing shaft 28 fixed to one end thereof and an upper knife 30 attached to the other end thereof. The upper knife swing shaft 28 is rotatably supported by a metal 32 inserted and supported by a frame (not shown). An upper knife drive arm 34 is fixed to the upper knife swing shaft 28, and an upper end of the upper knife drive arm 34 is connected by an upper knife drive arm connecting pin 36 and a connecting link 38 to the upper knife drive rod 1.
It is connected to the upper end of 8. A link mechanism is constituted by the connecting link 38 and the upper knife driving arm 34.

A conversion arm shaft 42 is fixed to the upper end of a switching lever base 40 fixed to a frame (not shown), and a switching lever shaft 44 is rotatably supported to the lower end. A conversion arm 46 is rotatably supported by the conversion arm shaft 42, a pin 48 is fixed to the lower end of the conversion arm 46, and an adjuster shaft 50 is rotatably supported at the upper end.

An adjuster 52 having a guide groove 52a is fixed to the adjuster shaft 50, and the square sesame 22 is fitted in the guide groove 52a. A conversion pin 54 is fixed to the lower end of the adjuster 52.

A switching lever 56 and a switching cam 58 are fixed to the switching lever shaft 44, and a long hole 56a into which the conversion pin 54 of the adjuster 52 is fitted is formed at the upper end of the switching lever 56. Therefore, the adjuster 52 rotates around the axis of the adjuster shaft 50 as the switching lever 56 rotates, and the inclination angle θ changes.

An elongated hole 62 is formed in the frame inside or above the looper cover 61 of the sewing machine as shown by the solid line or dotted line in FIG. Protruding to. Furthermore, the conversion pin 54 of the adjuster 52 and the long hole 5 of the switching lever 56
6a and the like form the adjuster rotating means, and the conversion arm 46 and the switching cam 58 form the adjuster moving means.

The upper knife release device according to the present embodiment has the above-mentioned structure, and when the upper knife drive rod 18 makes a vertical swing motion by the rotation of the main shaft 14, the square sesame 22 causes the adjuster 52 to move.
It reciprocates along the guide groove 52a. When overedging is performed, the inclination angle θ of the adjuster 52 is set to an angle such that the upper knife 30 can perform cloth cutting with a predetermined stroke.

FIG. 5 is an analysis diagram for explaining the movement of each component accompanying the rotation of the switching lever 56 in this embodiment, and FIG.
[Fig. 3] is a perspective view showing the main part of a sewing machine incorporating this embodiment, showing the state when the upper knife is released.

In FIG. 5, point r indicates the lower end of the upper knife driving rod 18, point c indicates the tip of the switching lever 56, and point B indicates the tip of the upper knife swing arm 26. The symbol "'" attached to the reference symbol indicates the position of each component and the like when the upper knife is released, the symbol "U" indicates the position of each component at the top dead center, and the symbol "L" indicates the position of each component at the bottom dead center.

When the tip of the switching lever 56 is in the position c (driving position) (positions in FIGS. 2 and 4), the upper knife driving rod 16 is driven by the eccentric movement of the upper knife driving cam 16 as the main shaft 14 rotates. As is well known, the lower end r of 18 draws a circular motion centering on the main axis 14 and passing through a top dead center rU and a bottom dead center rL. Therefore, the upper knife driving rod connecting pin 20 at the upper end of the upper knife driving rod 18 swings up and down substantially between 20U and 20L, and the square sesame 22 reciprocates along the guide groove 52a of the adjuster 52 as described above. exercise. Therefore, the upper knife swing shaft 28 is connected via the connecting link 38 and the upper knife drive arm 34.
Swings, and as a result, the tip position of the upper knife swing arm 26 becomes BU.
4 and BL, the upper knife 30 cuts the cloth edge while being pressed by the lower knife 60 mounted on the side surface of the needle plate 12, as shown in FIG.

When performing double chain stitches and special stitches that do not require cloth cutting, switch lever 56 to switch lever 5
The tip of 6 is rotated from position c to position c '(release position). At this time, the switching cam 58 rotates, and the conversion arm 46 is rotated via the pin 48 fixed to the lower end of the conversion arm 46. Therefore, the adjuster 5 supported on the upper end of the conversion arm 46
2 also rotates. At this time, the pin 48 moves to the 48 'position and the adjuster shaft 50 moves to the 50' position. By moving the adjuster 52, the upper knife drive arm connecting pin 36 moves to the position 36 ′ via the square sesame 22 and the connecting link 38, and the upper knife swing arm 26 eventually moves the upper knife swing shaft 28. As a result, the center moves largely to the point B ', and the state shown in FIG. 6 is obtained. Therefore, as shown in the figure, the auxiliary bed 64 can be used, and the working space can be widened.

Further, the switching lever 56 has the release position c '.
By rotating to the conversion pin 5 at the lower end of the adjuster 52
4 is moved to the position 54 ', and the adjuster 52 moves the adjuster shaft 50
Rotate around. As a result of this rotation, the tilt angle of the adjuster 52 is changed so that the upper knife swinging shaft 28 (hence the upper knife swinging arm 2).
6) The angle does not rock. Regarding this inclination angle, the locus (the locus between 20'U-20'L) of the upper knife driving rod connecting pin 20 moving between the top dead center and the bottom dead center along the guide groove 52a is the upper knife driving arm connecting pin. The inclination angle is such that a circular arc centering on 36 'is drawn.

In the above description, the stop and the upward retreat of the upper knife 30 are described separately, but in actuality, the operation of retracting the upper knife 30 by switching the switching lever 56 and the upper knife 30 are performed.
The operation of stopping the vertical swing of is simultaneously performed. The operation can be performed at any position of the upper knife driving phase.

When performing double chain stitches and special stitches that do not require cloth cutting, rotate the upper knife 30 backward as shown in FIG. 6 before rotating the switching lever 56 to the release position. It is preferable to set.

[0031]

In the upper knife release device according to the first aspect of the present invention, when sewing without using a knife, the adjuster rotating means rotates the adjuster around the adjuster shaft, and the upper knife swing shaft rotates. Try not to. Therefore, the upper knife swinging swing arm is stopped and it is safe.

In the upper knife release device according to the second aspect of the invention, during sewing without using a knife, the adjuster shaft moving means moves the adjuster shaft, and the link mechanism rotates the upper knife swing shaft. As a result, since the upper knife swing arm retracts upward, the working space can be widened. In the upper knife release device according to claim 3, when sewing without using a knife, the upper knife swinging and swinging arm is stopped and retracted upward simultaneously by operating the switching lever, so that the operation is simple and safe. The space can be widened.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire overlock sewing machine suitable for applying an upper knife release device according to this embodiment.

FIG. 2 is a perspective view of an upper knife release device according to the present embodiment.

FIG. 3 is an exploded perspective view of the upper knife release device according to the present embodiment.

FIG. 4 is a perspective view showing a main part of a sewing machine incorporating the upper knife release device according to the present embodiment, showing a state when the upper knife is driven.

FIG. 5 is an analysis diagram for explaining the movement of each component when the switching lever of the upper knife release device according to the present embodiment is rotated.

FIG. 6 is a perspective view showing a main part of a sewing machine incorporating the upper knife release device according to the present embodiment, showing a state when the upper knife is released.

[Explanation of symbols]

 2 Overlock sewing machine 4 Arm 6 Bed 8, 10 needles 12 Needle plate 14 Spindle 16 Upper knife drive cam 18 Upper knife drive rod 20 Upper knife drive rod connecting pin 22 Square sesame 24 Needle bar drive rod 26 Upper knife swing arm 28 Upper Knife swing axis 30 Upper knife 32 Metal 34 Upper knife drive arm 36 Upper knife drive arm Connecting pin 38 Connecting link 40 Switching lever base 42 Converting arm shaft 44 Switching lever shaft 46 Converting arm 48 pin 50 Adjuster shaft 52 Adjuster 52a Guide Groove 54 Conversion pin 56 Switching lever 58 Switching cam 60 Lower female 62 Long hole

Claims (3)

[Claims] 1. An overlock sewing machine that performs at least one type of sewing other than overedging and overedging, and an upper knife swing arm to which an upper knife for cloth cutting is attached, and the upper knife swing arm fixed to the upper knife swing arm. And an rotatably supported upper knife swing shaft, an adjuster shaft, and a guide groove, which is rotatable about the adjuster shaft, and a substantially straight line reciprocating along the guide groove. A link mechanism having one end for performing motion and the other end fixed to the upper knife swing shaft, and the upper knife swing shaft rotates when sewing with a knife, and the upper knife when sewing without a knife. An upper knife release device, comprising: an adjuster rotating means for adjusting a rotation angle of the adjuster so that the knife swing shaft does not rotate. 2. An overlock sewing machine which performs at least one type of sewing other than overedging and overedging, and an upper knife swing arm to which an upper knife for cloth cutting is attached, and the upper knife swing arm fixed to the upper knife swing arm. And an rotatably supported upper knife swing shaft, an adjuster shaft, and a guide groove, which is rotatable about the adjuster shaft, and a substantially straight line reciprocating along the guide groove. A link mechanism having one end for performing motion and the other end fixed to the upper knife swing shaft, the upper knife swing arm downward when sewing with a knife, and the upper knife when sewing without a knife. An upper knife release device comprising: an adjuster shaft moving means capable of moving the adjuster shaft so as to retract the knife swing arm upward. 3. An overlock sewing machine which performs at least one type of sewing other than overedging and overedging, and an upper knife swing arm to which an upper knife for cloth cutting is attached, and the upper knife swing arm fixed to the upper knife swing arm. And an rotatably supported upper knife swing shaft, an adjuster shaft, and a guide groove, which is rotatable about the adjuster shaft, and a substantially straight line reciprocating along the guide groove. A link mechanism having one end for performing motion and the other end fixed to the upper knife swing shaft, and the upper knife swing shaft rotates when sewing with a knife, and the upper knife when sewing without a knife. Adjuster rotating means for adjusting the rotation angle of the adjuster so that the knife swing shaft does not rotate, and the upper knife swing arm downward when sewing with a knife, and the upper knife when sewing without a knife. Knife swing arm up An upper knife release device comprising: an adjuster shaft moving means capable of moving the adjuster shaft so as to retract toward one side; and a switching lever for simultaneously operating the adjuster rotating means and the adjuster shaft moving means. .