JP6122301B2 - Overlock sewing machine - Google Patents

Description

The present invention, in the case of sewing using a cover thread relates Luo chromatography sewing machine can properly adjust the thread gripping pressure depending on the cover thread to be used.

  When sewing with a sewing machine that uses a plurality of sewing threads such as an overlock sewing machine, it is necessary to change the tension applied to each sewing thread in accordance with the type of sewing (overlock sewing, full-winding sewing, decorative sewing, etc.). In addition, it is necessary to change the tension applied to each sewing thread depending on the type of sewing thread used, such as spun yarn, cotton yarn, filament yarn or the like.

  A sewing machine has also been developed in which the tension applied to each sewing thread is collectively changed with a single dial so that the user can easily change the tension applied to each sewing thread. However, since a slight difference may occur in the thickness of the cloth when actually sewing, a fine adjustment lever capable of finely adjusting the tension applied to each sewing thread is usually provided.

  For example, in Patent Document 1, the thread tension of a plurality of thread tension units can be simultaneously switched by a conversion knob, and the thread tension of a sewing machine can be manually adjusted by a manual thread tension dial in that state. An apparatus is disclosed. Further, in Patent Document 2, the tension of an overlock sewing machine that can adjust the clamping pressure between a pair of thread tension plates supported so as to be slidable only in the axial direction to a desired clamping pressure by an end face cam. A vessel is disclosed.

Japanese Patent No. 3046602 Utility Model Registration No. 2584980

  However, in the thread tension adjusting device of the sewing machine and the thread tensioner of the overlock sewing machine disclosed in Patent Documents 1 and 2, the spring tension is caused by the rotation of the conversion (change) knob, so that the pair of thread tension plates becomes a pair. The urging force changes, and the tension applied to the sewing thread is changed by the pinching force. Therefore, the tension can be set to 0 (zero). In this case, no tension is applied to the sewing thread to be used.

  However, some sewing threads used are thicker than the distance between a pair of thread tension plates, such as decorative threads. When using a thread that is thicker than the distance between the two pairs of thread tension plates, even if the tension is set to 0 (zero), the two pairs of thread tension plates will be expanded by the used thread, A constant tension is applied to the used thread. For this reason, there is a problem that it is difficult to perform the intended sewing.

The present invention has been made in view of such circumstances, even cover thread is thick sewing thread used, and to provide a Luo chromatography sewing machine it is possible to impart appropriate tension.

Overlock sewing machine according to the first invention to solve the above problem, a thread gripping pressure to match the sewing a overlock sewing machine comprising a cover thread guide member to be applied to the cover thread, the fancy yarn guiding member comprises a tensioning unit for applying tension to cover thread, and a fixing portion for fixing to the sewing machine housing top at one end, and a connecting portion having a tension applying portion on the other end, respectively, the sewing machine housing the fixing portion In a state of being fixed to the upper part of the body , there is a suspension part that is above the tension applying part and suspends the decorative thread in a direction in which the decorative thread sandwiched between the tension applying parts is stretched without being bent as it is. The decorative yarn suspended by the suspension portion is sandwiched by the tension applying portion and guided to the sewing needle through the tension applying portion .

In the first invention, cover thread guiding member is provided with a tensioning unit for applying tension to cover thread, and a fixing portion for fixing to the sewing machine housing top at one end, and a connecting portion having a tensioning unit at the other end, respectively In the state where the fixing part is fixed to the upper part of the sewing machine casing, the suspension part that is above the tension applying part and suspends the decoration thread in the direction in which the decoration thread sandwiched between the tension applying parts is stretched without being bent as it is. The decorative yarn suspended and suspended by the suspension portion is sandwiched by the tension applying portion and guided to the sewing needle through the tension applying portion . As a result, even when a thick decorative thread is used, the decorative thread can be guided by the decorative thread guiding member without going through the thread tensioner. Therefore, even if the tension is set to 0 (zero), it is constant. Therefore, it is possible to apply an appropriate tension and to perform sewing with high accuracy.

Further, overlock sewing machine according to the second invention, in the first invention, the tension applying portion is constituted by two plate members and the biasing member for holding the cover thread, the biasing member and the An adjustment member that adjusts the urging force applied to the two plate members is provided.

  In the second invention, the tension applying portion is composed of two plate members and an urging member that sandwich the decorative yarn, and an adjusting member that adjusts the urging force that the urging member applies to the two plate members. It has. Accordingly, the tension applied to the decorative yarn can be easily adjusted by holding the decorative yarn between the two plate members and adjusting the yarn clamping pressure of the two plate members with the adjusting member that is screwed. It becomes possible.

According to the present invention, cover thread guiding member includes a tensioning unit for applying tension to cover thread, and a fixing portion for fixing to the sewing machine housing top at one end, and a connecting portion having a tensioning unit at the other end, respectively A suspension part that suspends the decoration thread in the direction in which the decoration thread sandwiched between the tension application parts is stretched without being bent as it is , with the fixing part fixed to the upper part of the sewing machine casing. The decorative yarn suspended by the suspension portion is sandwiched by the tension applying portion and guided to the sewing needle through the tension applying portion . As a result, even when a thick decorative thread is used, the decorative thread can be guided by the decorative thread guiding member without going through the thread tensioner. Therefore, even if the tension is set to 0 (zero), it is constant. Therefore, it is possible to apply an appropriate tension and to perform sewing with high accuracy.

It is a front view which shows the structure of the thread tension device of the overlock sewing machine which concerns on embodiment of this invention. It is a schematic diagram for demonstrating the relationship between the thickness of the sewing thread and the tension applied by the urging force of the compression spring when the tension is set to 0 (zero). It is a three-plane figure which shows the structure of the decoration thread guide member of the overlock sewing machine which concerns on embodiment of this invention. It is a schematic diagram which shows the state which installed the decoration thread induction | guidance | derivation member of the overlock sewing machine which concerns on embodiment of this invention.

  Hereinafter, a decorative thread guiding member for an overlock sewing machine according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing a configuration of a thread tensioner of an overlock sewing machine according to an embodiment of the present invention.

  As shown in FIG. 1, the thread tension device 1 of the overlock sewing machine according to the present embodiment includes a thread tension adjusting mechanism 2, 2, 2, 2 for left needle, right needle, upper looper, and lower looper. Are provided on the same axis as the rotation axis of the operation dial 3. The plurality of thread tension adjusting mechanisms 2, 2, 2, 2 are sandwiched between the support plates 4, 5 and can operate the gear mechanism in conjunction with the operation dial 3. That is, by rotating the operation dial 3, the thread clamping pressure in each thread tension adjusting mechanism 2 can be adjusted at once.

  The thread tension adjusting mechanism 2 has a thread tension tray 21 that sandwiches the sewing thread pressed against one end. The thread tension tray 21 is composed of two symmetrically shaped plates that are opposed to each other, and the other end side plate is pressure-bonded to the one end side plate by a biasing force.

  A base plate 22 is provided on the other end side of the thread tension adjusting mechanism 2, and the base plate 22 is provided with a protrusion (not shown) for controlling the operation of the end face cam 24. The shape of the surface of the end cam 24 that comes into contact with the protrusion is changed for each thread tension adjusting mechanism 2. As the operation dial 3 rotates, the end face cam 24 of the connected thread tension adjusting mechanism 2 rotates.

  When the end face cam 24 rotates, the contact position with the protrusion changes, and the end face cam 24 moves in the connecting direction of the thread tension adjusting mechanism 2, that is, in the left-right direction in FIG. 1 according to the contact position with the protrusion. . In accordance with the movement of the end face cam 24, the urging force of the compression spring (biasing member) 25 to the thread tension tray presser gear 26 and the thread tension tray presser 27 varies. In other words, the end face cam 24 moves toward one end as the end face cam 24 and the protrusion come into contact with each other at a shallow position on the end face of the end face cam 24, and the compression spring 25 does not rotate and the left and right sides without rotating. The urging force to the thread tension plate presser 27 that can move in the direction increases. Accordingly, since the pressing force by which the thread tension tray presser 27 presses the tray on the other end side of the thread tension tray 21 against the tray on the one end side increases, the thread clamping pressure for sandwiching the sewing thread in the thread tension tray 21 increases.

  On the other hand, the end face cam 24 moves to the other end side as the end face cam 24 and the protrusion come into contact with each other at a deeper position on the end face of the end face cam 24, and the thread tension plate presser gear 26 and the thread tension plate presser of the compression spring 25. The urging force to 27 becomes small. Accordingly, since the pressing force with which the thread tension tray presser 27 presses the tray on the other end side of the thread tension tray 21 against the tray on the one end side is reduced, the thread clamping pressure for sandwiching the sewing thread in the thread tension tray 21 is reduced. By rotating the operation dial 3 by designing the shape of the surface of the thread tension adjusting mechanism 2 that comes into contact with the protruding portion of the end cam 24 so that a desired thread clamping pressure is generated according to the rotation of the operation dial 3. Thereby, the thread clamping pressure for sandwiching the sewing thread in the plurality of thread tension dishes 21, 21, 21, 21 composed of two dishes can be collectively adjusted.

  However, when the sewing thread to be used is thicker than the interval between the two plates of the thread tension plate 21, even if the tension is set to 0 (zero), the plate on the other end side becomes the urging force of the compression spring 25. As a reaction force, the tension is applied to the sewing thread by the urging force of the compression spring 25. Accordingly, the tension applied to the sewing thread cannot be reduced to 0 (zero), and there is a possibility that the feeding of the sewing thread during sewing may be hindered.

  FIG. 2 is a schematic diagram for explaining the relationship between the thickness of the sewing thread to be used and the tension applied by the urging force of the compression spring 25 when the tension is set to 0 (zero). FIG. 2A shows a case where a normal sewing thread is used, and FIG. 2B shows a case where a thick sewing thread such as a decorative thread is used.

  As shown in FIG. 2A, when a normal sewing thread is used, the interval w1 between the two plates 21a and 21b of the thread tension plate is substantially equal to the diameter d of the sewing thread, or d <w1. . Therefore, the compression spring 25 is not pushed back against the urging force by the plate 21b of the thread tension plate, so that the tension due to the urging force of the compression spring 25 is not applied to the sewing thread.

  On the other hand, as shown in FIG. 2 (b), when a thick sewing thread is used as a decorative thread, the interval w1 between the plates 21a and 21b of the thread tension tray is smaller than the diameter D of the thread, so that the thread tension is adjusted by the sewing thread. The dish 21b moves by a distance Δw, and the interval between the thread tension dishes 21a and 21b is w2. Therefore, the compression spring 25 is pushed back against the urging force by Δw by the thread tension plate 21b. Therefore, even if the tension is set to 0, a constant force is applied to the sewing thread due to the urging force of the compression spring 25. Tension is applied.

  Therefore, in the embodiment of the present invention, when using a thick sewing thread, for example, a decorative thread, a dedicated decorative thread guide is provided so that the sewing thread can be guided without going through the thread tensioner 1 shown in FIG. It is characterized in that it includes members. FIG. 3 is a three-side view showing the configuration of the decorative yarn guiding member of the overlock sewing machine according to the embodiment of the present invention.

  FIG. 3A is a side view showing the configuration of the decorative yarn guiding member 6 according to the present embodiment, and FIG. 3B is a plan view showing the configuration of the decorative yarn guiding member 6 according to the present embodiment. FIG. 3 (c) is a front view showing the configuration of the decorative yarn guiding member 6 according to the embodiment of the present invention. The decorative yarn guiding member 6 according to the present embodiment includes a tension applying portion 61 that applies tension to the decorative yarn, and a connecting portion 62 that is connected to the tension applying portion 61. A fixing portion 63 for fixing to the upper part of the body is provided.

  The connecting portion 62 is formed by bending a plate-like member so that the cross-sectional shape in the longitudinal direction is substantially U-shaped, and the tension applying portion is provided at the other end opposite to the one end where the fixing portion 63 is provided. 61 is attached. Accordingly, the tension applying portion 61 can be disposed at a position where the guide hole for guiding the sewing thread is provided in the thread tensioner 1 without the tension applying portion 61 being in direct contact with the upper portion of the sewing machine casing.

  One end of the connecting portion 62 is provided with a notch portion that can be screwed to the upper portion of the sewing machine casing as a fixing portion 63, and is screwed to the upper portion of the sewing machine casing in accordance with the installation position of the spool for the decorative yarn. can do.

  The tension applying unit 61 has a plate-like fixing member 65 and a variable plate member 66 overlapped, and a compression spring 67 is sandwiched between the variable plate member 66 and the adjustment member 68 as an urging member. By urging the adjusting member 68 to the casing of the tension applying portion 61, the urging force by the compression spring 67 can be adjusted. Since the degree of freedom of the adjustment width of the interval for holding the sewing thread becomes larger than that of the conventional thread tensioner, an appropriate thread clamping pressure can be applied without depending on the thickness of the decorative thread.

  FIG. 4 is a schematic view showing a state in which the decorative thread guiding member 6 of the overlock sewing machine according to the embodiment of the present invention is installed. The decorative thread guiding member 6 is screwed to the upper portion of the sewing machine housing 10 in accordance with the installation position of the decorative thread spool 41. The decorative yarn drawn from the decorative yarn winding 41 is drawn to the tension applying portion 61 of the decorative yarn guiding member 6 through the suspension portion 42.

  The decorative yarn to which an appropriate tension is applied by the tension applying portion 61 of the decorative yarn guiding member 6 is guided to the needle hole of the sewing needle through the same path as usual. Thus, for example, when using a thick sewing thread such as a decoration thread, the sewing thread can be guided by the decoration thread guiding member 6 without going through the thread tensioner 1, so that it is easy and highly accurate. Sewing is possible.

  As described above, according to the present embodiment, the tension applying portion 61 that applies tension to a relatively thick sewing thread such as a decorative thread, and the fixing portion 63 that fixes the upper portion of the sewing machine housing 10 at one end are provided at one end. The other end is provided with a connecting portion 62 having a tension applying portion 61, fixed to the upper portion of the sewing machine casing 10, and the decorative thread is guided to the sewing needle through the tension applying portion 61. As a result, even when a thick decorative thread is used, the sewing thread can be guided by the decorative thread guiding member 6 without going through the thread tensioner 1, so even if the tension is set to 0 (zero). An appropriate tension can be applied without a constant tension being applied, and sewing can be performed with high accuracy.

  In addition, various modifications can be added to the above-described embodiment without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Thread tension device 6 Decoration thread guide member 10 Sewing machine case 21, 21a, 21b Thread tension tray 41 Thread winding 61 Tension applying part 62 Connection part 63 Fixing part 65 Fixing member (plate member)
66 Variable plate member (plate member)
67 Compression spring (biasing member)
68 Adjustment member

Claims (2)

An overlock sewing machine provided with a decorative thread guiding member that applies a decorative thread to the thread clamping pressure in accordance with the sewing method ,
The decorative yarn guiding member is
A tension applying unit that applies tension to the decorative thread;
Comprising a fixing portion for fixing to the sewing machine housing top at one end, and a connecting portion having a tension applying portion on the other end, respectively,
In a state where the fixing portion is fixed to the upper part of the sewing machine casing, the decorative yarn is placed above the tension applying portion in a direction in which the decorative yarn sandwiched between the tension applying portions is stretched without being bent as it is. An overlock sewing machine having a suspended portion that is suspended, wherein the decorative yarn suspended by the suspended portion is sandwiched between the tension applying portions and guided to a sewing needle through the tension applying portion . The tension applying unit is
Consists of two plate members and a biasing member that sandwich the decorative thread,
The overlock sewing machine according to claim 1, further comprising an adjustment member that adjusts an urging force applied to the two plate members by the urging member .

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