JP2000308772A - Needle oscillating device for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange an additional system such as a cloth cutting device in the rear of a needle bar from an operator's side in a needle oscillating device for a sewing machine. SOLUTION: This needle oscillating device comprises a needle bar 3 supported vertically movably and laterally swingably to a head frame mounted on and opposed above a sewing machine bed, a driving means 18 interlocking with a sewing machine driving shaft 11 and supported swingably and rotatably round a predetermined fixed shaft 19 line, a swinging member 23 interlocking with the driving means 18, being swingable in the to-and-fro direction and disposed along the to-and-fro direction, and a converting system for converting the to- and-fro swing into the lateral swing of the needle bar 3. In this case, the swinging member 23 is arranged by being offset laterally toward the needle bar 3. Further, a supporting member 25 for supporting the needle bar 3 vertically movably is fixed to a vertical shaft 26, the axis of which is substantially vertical and which interlocks with the swinging member and is vertically movable. Then, a cloth cutting knife 5 is arranged in the rear of the needle bar 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle swinging device for a sewing machine.

[0002]

2. Description of the Related Art A conventional needle swinging device for a sewing machine includes, for example,
As shown in FIG. 6, the rotation of the upper shaft 61 causes the swing cam 6 to rotate.
2, drive fork 63, swing link 64, swing drive arm 65,
The needle bar swing table 68 moves up and down along the needle bar 69 via the swing drive arm fulcrum shaft 66 and the needle bar swing fork 67. At this time, the pin 68a assembled to the needle bar swing table 68
The needle bar 69 moves upward and downward along a diagonal groove (not shown) formed in the needle bar 69 to swing the needle.

[0003]

However, in the conventional needle swinging device having the above-described mechanism, the needle bar swinging fork 67 and the swing drive arm fulcrum shaft 66 are provided behind the needle bar 69 when viewed from the operator side. In the sewing machine arm (not shown), there is a problem that there is no space behind the needle bar 69 for disposing another mechanism such as a cloth cutting device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a needle swinging device for a sewing machine in which another mechanism such as a cloth cutting device can be arranged behind the needle bar when viewed from the operator side.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a head frame (e.g., a head frame that is erected on a sewing machine bed (1) and is located above and facing the sewing machine bed (1). A needle bar (3) supported to be vertically movable and swingable in the horizontal direction with respect to the sewing machine arm (2), and a predetermined fixed shaft (1) in conjunction with a sewing machine drive shaft (for example, upper shaft 11).
9) A drive member (for example, a swing drive arm 18) supported so as to be swingable and rotatable about a line, and swingable in the front-rear direction in conjunction with the drive member and arranged along the front-rear direction. Needle swing of a sewing machine including a swing member (for example, swing link 23) and a conversion mechanism (33) for converting the swing of the swing member in the front-rear direction into the swing of the needle bar in the lateral direction. A device,
The swing member (23) is characterized in that it is arranged so as to be offset laterally with respect to the needle bar (3).

As described above, according to the first aspect of the present invention, the swinging member which can swing in the front-rear direction in conjunction with the driving member which can swing and rotate about a predetermined fixed axis in conjunction with the sewing machine drive shaft. A needle swinging device in which the moving member is laterally offset from the needle bar that swings laterally by a conversion mechanism that converts the swinging in the front-rear direction.There is a swinging member behind the needle bar. It is possible to secure other space and arrange other mechanisms.

According to a second aspect of the present invention, there is provided the needle swinging device for a sewing machine according to the first aspect, wherein a supporting member (for example, a vertical holding member 25) for supporting the needle bar (3) so as to be vertically movable is provided with an axial line. Are fixed to a vertical axis (26) that can move up and down in a substantially vertical direction in conjunction with the swing member (23).

As described above, according to the second aspect of the present invention, the supporting member for supporting the needle bar so as to be able to move up and down is moved up and down in cooperation with the swinging member according to the first aspect so that the axis is substantially vertical. Since it is fixed to a possible longitudinal axis, in the transverse direction of the needle bar, the support member of the needle bar is moved up and down together with the longitudinal axis, the axis of which is substantially vertical, in conjunction with the swinging member. In other words, the swinging movement of the swinging member in the front-rear direction can be converted into a swinging movement in the vertical direction from the lateral direction with respect to the needle bar, and the swinging member can be offsetly arranged in the horizontal direction of the needle bar. Further, by changing the position of the support member with respect to the vertical axis that performs the vertical movement, the swinging position of the needle bar in the horizontal direction can be easily changed.

The invention described in claim 3 is the first or second invention.
A needle swinging device for a sewing machine as described above, characterized in that a cloth cutting knife (5) is arranged behind a needle bar (3).

According to the third aspect of the present invention, since the cloth cutting knife is arranged behind the needle bar according to the first or second aspect, the space behind the needle bar can be effectively used.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sewing machine according to an embodiment of the present invention; FIG.

<First Embodiment> FIG. 1 is a schematic side view showing an example of a sewing machine to which the present invention is applied. In the drawing, reference numeral 1 denotes a sewing machine bed, and 2 denotes a sewing machine arm (head frame). Reference numeral 3 denotes a needle bar, 4 denotes a sewing needle, and 5 denotes a cloth cutting knife.
In this embodiment, as shown in the figure, a sewing machine provided with a cloth cutting knife 5 on the left side of the needle bar 3, that is, a buttonhole overlock sewing machine provided with the cloth cutting knife 5 behind the needle bar 3 as viewed from the operator side. The needle swing device will be described.

FIGS. 2 to 4 show a needle swing device of a sewing machine according to a first embodiment of the present invention. In the drawings, reference numeral 11 denotes an upper shaft (sewing machine drive shaft), and reference numeral 12 denotes a sewing machine driving shaft. A swing cam, 13 is a drive bifurcation, 16 is a first swing link, 18
Is a swing drive arm, 19 is a fixed shaft, 23 is a second swing link,
25 is a vertical axis holding (supporting member), 26 is a vertical axis, 28 is a swingable fork, 32 is a needle bar swing table, 33 is a conversion mechanism, 34 is an oblique groove, 35 is a pin, and 36 is a fulcrum member. . That is, an upper shaft 11 serving as a sewing machine drive shaft is rotatably provided in the sewing machine arm 2, which stands on the sewing machine bed 1 and forms the frame facing the upper side thereof. The swing cam 12 is fixed to the upper shaft 11. The swinging cam 12 is in contact with a drive fork 13 that can swing in the front-rear direction (the same applies hereinafter when viewed from the operator side). The drive fork 13 swings back and forth about a fixed shaft 14 provided on the sewing machine arm 2, and a first swing link 16 is swingable via a connecting shaft 15 at a front portion thereof. Are linked.

At the front end of the first swing link 16,
A swing drive arm 18 as a drive member is connected at one end via a connection shaft 17 so as to be swingable in the front-rear direction. The swing drive arm 18 has a bell crank shape and swings in the front-rear direction around a fixed shaft 19 provided on the sewing machine arm 2 at a corner thereof. A second swing link 23 as a swing member is movable and swingable in the front-rear direction via a pin 22 in an arc-shaped long hole 21 formed in the front half from the corner of the swing drive arm 18 described above. Is connected at the upper end. The second swing link 23 is disposed on the left side of the needle bar 3 in the lateral direction (the same applies to the following when viewed from the operator side), and the lower end thereof is connected to the longitudinal axis holder 25 via the connecting shaft 24 in the front-rear direction. And is fixedly connected to an arbitrary position in the arc-shaped long hole 21. The vertical axis holder 25 is fixed to a vertical axis 26 whose axis is the vertical direction. The vertical axis 26 is vertically movable along upper and lower guide members 27 provided on the sewing machine arm 2.

Further, a vertical bifurcation 28
Are supported to be movable in the lateral direction.
The cylindrical member 31 is supported by the pair 8 via a pair of pins 29, 29. The cylindrical member 31 is erected integrally with the needle bar rocking table 32. The needle bar 3 is supported by the cylindrical member 31 and the needle bar rocking table 32 so as to be movable in the vertical direction. I have. A conversion mechanism 33 is formed in the needle bar swing table 32. That is, the conversion mechanism 33 includes a diagonal groove 34 formed in the needle bar swing table 32 and a pin 35 that engages with the diagonal groove 34. The pin 35 is fixed to the sewing machine arm 2. It is provided. Also, pin 3
5 may be provided so as to be fixed to a revolvable and vertically fixed revolving part 70. Thus, the needle bar 3
Is supported by the vertical axis hanger 25 via the needle bar swing table 32 (the cylindrical member 31) and the swinging fork 28. Therefore, the vertical axis hanger 25 can move the needle bar 3 in the vertical direction. Also serves as a supporting member to support. The needle bar 3 is supported at its upper end by a fulcrum member 36 provided on the sewing machine arm 2 so as to be swingable in all directions including front and rear and right and left directions.

Next, the operation of the needle swing device of the sewing machine having the above configuration will be described. First, when the upper shaft 11 rotates, the integral swing cam 12 rotates, and the drive fork 13 in contact with the swing cam 12 swings around the fixed shaft 14 in the front-rear direction. The first swing link 16 swings back and forth through the connecting shaft 15 by the forward and backward swing of the drive fork 13, and the swing driving arm 18 swings about the fixed shaft 19 through the connecting shaft 17. Rotate dynamically. By the swing rotation of the swing drive arm 18, the vertical axis holding 25 and the vertical axis 26 are integrally moved in the vertical direction (vertical direction) via the pin 22 inserted into the arc-shaped long hole 21 and the second swing link 23. Go to). Then, the swinging fork 28 also moves in the vertical direction together with the vertical axis holder 25, whereby the needle bar swinging table 32 (the cylindrical member 31) also moves in the vertical direction through the pins 29, 29. I do. In the vertical movement of the needle bar swing table 32, the pin 35 fixed to the sewing machine arm 2 is engaged with the oblique groove portion 34, so that the needle bar 3 moves in the horizontal direction with the upper fulcrum member 36 as a fulcrum. Rocks.

As described above, since the second swing link 23 is arranged offset from the needle bar 3 in the lateral direction, the conventional needle bar swing bifurcation and swing drive are provided behind the needle bar 3. A space in which the swing member such as the arm fulcrum shaft does not exist is secured. Therefore, the cloth cutting knife 5 can be arranged behind the needle bar 3 as shown in the figure. Further, by changing the fixed position of the swing drive arm 18 and the second swing link 23 with the pin 22, the swing amount of the needle bar 3 in the horizontal direction can be easily changed, that is, the sewing needle 4 The needle drop position in the horizontal direction can be changed.

<Second Embodiment> FIG. 5 shows a needle swing device of a sewing machine according to a second embodiment of the present invention. The first embodiment shown in FIG. 2) are denoted by the same reference numerals, and 3
Reference numeral 7 denotes a second vertical holding body. In this embodiment, a second vertical holding member 37 is provided in addition to the vertical holding member 25. That is, the second swing link 23 is swingably connected to the second vertical holding member 37 by the connection shaft 24, and the second vertical holding member 37 is fixed to the vertical shaft 37. Further, below the second vertical holding member 37, the vertical holding member 25 supporting the swing bifurcation 28 is fixed to the vertical axis 37. With such a configuration, functions and effects similar to those of the above-described first embodiment can be obtained. Further, by changing the fixed position of the vertical axis holding member 25 with respect to the vertical axis 26, an effect is obtained that the lateral position of the needle bar 3 can be easily changed independently of the swing amount.

In each of the above embodiments,
Although the needle swinging device of the buttonhole sewing machine is described, the present invention is not limited to this, and a needle swinging device of a staggered sewing machine may be used. Further, the configuration of the conversion mechanism for converting the swinging of the swinging member in the front-back direction into the swinging of the needle bar in the lateral direction is also arbitrary, and other specific detailed structures can be appropriately changed. Of course.

[0020]

As described above, according to the needle swinging device for the sewing machine according to the first aspect of the present invention, the needle swinging device interlocks with the drive shaft that swings about a predetermined fixed axis in conjunction with the drive shaft. By arranging the swinging member that swings back and forth in the lateral direction with respect to the needle bar that swings laterally by the conversion mechanism that converts the swinging in the front and rear direction, behind the needle bar, Because the space where the swing member does not exist can be secured,
Other mechanisms can be arranged.

According to the needle swinging device for a sewing machine according to the second aspect of the present invention, the support member for supporting the needle bar so as to be vertically movable is fixed to the vertical axis which vertically moves in conjunction with the swing member. In the transverse direction of the bar, the support member of the needle bar can be moved up and down together with the vertical axis whose axis is substantially vertical in conjunction with the swinging member. That is, in addition to the effect obtained by the invention of claim 1, the swinging motion of the swinging member in the front-rear direction is converted into the swinging motion of the needle bar in the vertical direction from the lateral direction with respect to the needle bar. The swinging member can be offset and the swinging position of the needle bar in the horizontal direction can be easily changed by changing the position of the supporting member with respect to the vertical axis that performs vertical movement. Such advantages can be obtained.

According to the needle swinging device of the sewing machine according to the third aspect of the present invention, since the cloth cutting knife is disposed behind the needle bar, in addition to the effects obtained by the first or second aspect of the present invention, The advantage that the rear space can be used effectively can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an example of a sewing machine to which the present invention is applied.

FIG. 2 is a schematic side view showing a needle swing device of a sewing machine as a first embodiment of the present invention.

FIG. 3 is a schematic plan view showing the needle swinging device of FIG. 2;

FIG. 4 is a schematic front view showing the needle swing device of FIGS. 2 and 3;

FIG. 5 is a schematic side view showing a needle swing device of a sewing machine as a second embodiment of the present invention.

FIG. 6 is a perspective view showing an example of a conventional needle swinging device of a sewing machine, showing a configuration from an upper axis to a vertical axis.

[Explanation of symbols]

 Reference Signs List 1 sewing machine bed 2 sewing machine arm (head frame) 3 needle bar 4 sewing needle 5 cloth cutting knife 11 upper shaft (sewing machine drive shaft) 12 swing cam 13 drive fork 16 first swing link 18 swing drive arm (drive 19) Fixed shaft 23 Second swing link (swing member) 25 Vertical axis holding (supporting member) 26 Vertical axis 28 Swing bifurcation 32 Needle bar swing table 33 Conversion mechanism 34 Oblique groove 35 Pin 36 Supporting point member 37 Hold the second vertical axis

Claims (3)

[Claims] 1. A needle bar supported upright on a sewing machine bed so as to be vertically movable and swingable in a lateral direction with respect to a head frame located above and facing the sewing machine bed. A driving member supported so as to be swingably rotatable about a predetermined fixed axis in conjunction with the swing member, and a swing member that is swingable in the front-rear direction in conjunction with the drive member and disposed along the front-rear direction. A conversion mechanism for converting the swinging movement of the swinging member in the front-rear direction to the swinging movement of the needle bar in the lateral direction. A needle swinging device for a sewing machine, comprising: A needle swinging device for a sewing machine, wherein the needle swinging device is arranged offset in a lateral direction. 2. A supporting member for supporting a needle bar in a vertically movable manner,
2. The needle swinging device for a sewing machine according to claim 1, wherein the axis is fixed to a vertical axis that can move up and down in conjunction with the swing member in a substantially vertical direction. 3. A cloth cutting knife is disposed behind the needle bar.
The needle swinging device for a sewing machine according to claim 1 or 2, wherein: