JPS6025147B2 - Oscillating base line change device for zigzag sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a swing base line changing device for a zigzag sewing machine.

Conventionally, in general zigzag sewing machines, in order to impart lateral oscillating motion to the needle, a oscillating body that oscillates in synchronization with the main shaft of the sewing machine is supported by a moving part, and the moving part is moved. The needle is configured so that the swing base line of the needle can be changed by operating to change the position of the swing axis of the swing member.

With the swing base line changed in this way, when one of the basic shape stitch patterns displayed on the pattern display board on the front of the sewing machine frame is selected and sewn, the basic shape A seam pattern having a shape different from the basic shape is formed outside the seam pattern. Therefore, while this is extremely convenient for those who are familiar with sewing machines, for those who are not fully familiar with sewing machines, there may be cases where the stitch pattern cannot be formed in the same shape as the stitch pattern displayed on the pattern display board. This sometimes gave rise to concerns that the sewing machine may have malfunctioned. In addition, due to recent requests from users,
Zigzag sewing machines, which focus on creating so-called practical patterns rather than figurative patterns, are becoming mainstream.

In this type of sewing machine, the above-mentioned change in the stitch pattern is not very useful in actual sewing work, so it is not possible to fix the swing axis of the swing body and change the needle swing base line. It has a structure that does not include a so-called swing base line changing device. However, when using a zigzag sewing machine configured in this way for certain types of sewing work, such as serging the edges of a workpiece cloth, the feeding effect of the workpiece cloth by the feed dog is enhanced and the workpiece cloth is In order to form an orderly stitch along the edge of the needle, there are cases where it is practically advantageous to temporarily change the swing reference position of the needle from the fixed position. This invention has been made in view of the above-mentioned circumstances, and its purpose is to oscillate a oscillating member that oscillates in synchronization with the main shaft of a sewing machine in order to impart lateral oscillating motion to a needle. It is an object of the present invention to provide a novel swing base line changing device that can change the swing base line of a needle without changing the position of the axis.

Hereinafter, the configuration of a zigzag sewing machine embodying the present invention will be explained with reference to the drawings. In the drawing, 1 is a sewing machine frame consisting of an arm part la and a pet part lb, and as shown in FIG. A needle and twill support frame 2 is supported within the tip head so as to be swingable in the lateral direction. Reference numeral 3 denotes a compression spring interposed between the needle birch support frame 2 and the arm portion la, which biases the needle birch support frame 2 toward the left in FIG.

Reference numeral 4 denotes a needle holder which is supported by the needle support frame 2 so as to be movable up and down, and as shown in FIG. It is designed to reciprocate up and down in synchronization with the rotation of the main shaft 7.

Reference numeral 8 denotes a presser foot installed in the neck of the arm portion la, and a presser foot 9 is attached to the lower end of the presser foot.

The presser foot 9 of this embodiment is biased to rotate clockwise in FIG. 1 by a wire spring 10', so that the tip of the presser foot 9 can also effectively press the work cloth. 11 is a support plate fixed in the arm part la of the sewing machine frame 1, and as shown in FIG. 2, a support shaft is provided on the rear surface of the monopod.
la is provided protrudingly.

Reference numeral 12 denotes a swinging member having a substantially U-shaped planar shape, whose lower end is swingably supported by the support shaft 11a, and as shown in FIGS. 5 and 6, the left end between the front and rear ends thereof is On the right side of the inner surface and front wall, there is a guide surface 12 that extends parallel to the vertical direction.
a and a guide groove 12b are formed, and a guide hole 12c extending parallel to the guide surface 12a is formed near the upper end of the front wall, and an arc-shaped first contact surface 12d is formed at the right end green of the rear adjustment.
is formed.

A plurality of pattern cams 13 are rotatably supported in the sewing machine frame 1 by a cam shaft 14 below the main shaft 7, and as is clear from FIG. 16.

17 is a follower support shaft 1 below the pattern cam 13.
A support arm 8 having a substantially U-shaped planar shape is rotatably supported within the sewing machine frame 1, and a support arm 19 is rotatable on the follower support shaft 18 so as to be rotatable integrally with the support arm. and a cam follower slidably supported, which is used to create a predetermined stitch pattern by operating an appropriate operation knob based on the display on a pattern display board (not shown) provided on the front surface of the sewing machine frame 1. When selected, it engages with the corresponding one of the pattern cams 13.

2. An operating link provided between the static right end of the swinging body 12 and the support arm 17, which controls the swinging movement of the cam follower 19 as the selected pattern cam 13 rotates. The vibration is transmitted to the swinging member 12, and the swinging member 12 is caused to swing around the support shaft 11a according to the cam shape.

Reference numeral 21 denotes a needle pin which is operatively connected to the lower end of the needle support frame 2 on the left end side, and is attached to the front surface of the right end side as shown in FIGS. 2 and 4 to 7. A large-diameter engaging member 22 and a small-diameter engaging roller 23 are provided concentrically, and due to the biasing force of the compression spring 3 applied to the needle support frame 2, the small-diameter engaging member 22 is always engaged as shown in FIG. The sewing machine needle at the lower end of the needle bar 4 is held in a state of engagement with the first supporting surface 12d of the swinging body 12 by the matching roller 23, and the lateral swinging movement according to the swinging of the swinging body 12 is caused by the sewing machine needle at the lower end of the needle bar 4. 6, as shown in FIG. 9, the sewing machine needle 6 is oscillated at a predetermined amplitude about the oscillation reference line x 1 based on the first rear surface 12d, and the sewing machine needle 6 is oscillated at a predetermined amplitude at the so-called central reference line. It is designed to form a seam pattern.

Reference numeral 24 denotes an operating shaft which is rotatably supported on the front wall of the sewing machine frame 1. As shown in FIG. Lever 26 is fixed.

Reference numeral 27 denotes an adjustment link which is connected at both ends to the tip of the rotating lever 26 and to the right end of the needle birch lever 21, and is moved up and down as the operating knob 25 is rotated, and the swinging part As shown in FIG. That is, the swing amplitude of the sewing machine needle 6 accompanying the swing of the swing body 12 is adjusted by changing the adjustment within the range between a position that coincides with the center of the support shaft 11a and a position furthest from the swing axis. It is now possible to do so.

28 is a support pin installed between the front and rear walls of the swing body 12 at a position away from the swing axis of the swing body 12; 29 is a support pin installed between the front and rear walls of the swing body 12; The switching part body is supported by the support pin 28 at its upper end so that it can be rolled around so as to be adjacent to the first abutting surface 12d between the switching parts, and as shown in FIG. The half has a small diameter engaging roller 23 on the needle machine lever 21 and the first contact surface 1.
2d, an arcuate second contact surface 29a that can selectively engage with the large diameter engager 22 on the needle birch 21.
is formed, and by the engagement between the second abutting surface 29a and the engaging element 22, the relative positional relationship of the needle barb 21 with respect to the swinging member body 12 is controlled in the longitudinal direction of the needle barbar tree 21. It is set to be changed in

When the second abutting surface 29a and the engaging element 22 are engaged, the swing amplitude region L of the sewing machine needle 6 threaded through the overlocking stitch, etc., as shown in FIG. 10, for example, on the 2.5 side Within the adjustment range between the intermediate swing amplitude W of about 5.0 degrees and the maximum swing amplitude W of about 5.0 degrees, as the swing body 12 swings, the sewing machine needle 6 moves to the swing standard shown in FIG. The first line different from line x1
The sewing machine needle 6 is oscillated about the oscillation reference line X2 based on the second supporting surface 29a in FIG. , a desired stitch pattern is formed along the so-called right base line along the right side of both extreme positions of the maximum swing amplitude W of the needle at any amplitude within the region L. 3 rivers, Figure 4,
As shown in FIGS. 5 and 7, the guide piece 30a hanging downward on one side is engaged with the guide groove 12b on the front surface of the swing body 12, so that it can be moved up and down in front of the swing body 12. A linking piece 30b is vertically provided on the lower side of the operating arm attached to the operating arm, and a through hole 30c, which has the largest hole shape and extends in the vertical direction, is formed near the upper end of the linking piece 30b. .

Reference numeral 31 denotes an actuating plate which is rotatably and slightly laterally movably attached to the front surface of the upper end of the actuating arm 30 by means of a mounting pin 32 at an approximately central portion thereof, and an elongated hole 31a extending laterally is formed in the right end of the actuating plate. ing.

Reference numeral 33 denotes an actuation pin provided protrudingly on the rear surface of the left end of the actuation plate 31, and as shown in FIGS. A guiding surface 12a formed on the inner surface of the left end between the front and rear walls of the swinging member 12 and the switching member 2 at the rear end thereof.
An actuator 33a is provided which enters between the left side of the switch 9 and the left side of the switch 9 in a reciprocating manner, and when the actuating arm 30 is moved upward as shown in FIG. surface 12d
The switching body 29 can be rotated in a direction intersecting with the sixth one.
When the actuating arm 30 is moved downward, the switching member 29 is brought to rest at the rest position shown in FIG. 8.

34 is the rightmost hole 31 from the front side of the actuating plate 31.
A stepped adjustment screw is screwed into the actuating arm 3 through a, and as is clear from FIG. By rotating this adjustment screw 34, the mounting position of the actuating plate 31 relative to the actuating arm 3 is changed, so that the actuating pin 33 and the switching member 29 are engaged with each other when the actuating arm 30 moves upward. The position is adjusted in the vertical direction, and the switching body 29
can be adjusted to a predetermined operating position.

As shown in FIG. 3, 35 is an operating lever that is rotatably mounted in the bed section lb of the sewing machine frame 1 by means of a mounting plate 36, and is located at one end of the control lever slightly below the upper surface of the bed section 1b. The operation piece 35a is bent so as to do so. Reference numeral 37 denotes an operating lever connected at both ends to the end of the operating lever 35 and the connecting piece 30b of the operating arm 30, and as the operating lever 35 rotates, the operating arm 3
0 is moved up and down, and the front self-switching member 29 is rotated to an operating or rest position.

Reference numeral 38 denotes a tension spring mounted between the operating lever 35 and the sewing machine frame 1, which biases the operating lever 35 clockwise in FIG. hold,
The switching body 29 is kept stationary at the rest position shown in FIG.

In this embodiment, when the fabric edge cutting attachment is fixedly arranged on the bed part lb of the sewing machine frame 1, the third operating lever 35 is moved in conjunction with the arrangement operation.
The sewing machine needle 6 is rotated from the chain line position to the solid line position in the figure, and the flute body 29 is rotated from the rest position in FIG. 8 to the operating position in FIG. The setting has been temporarily changed to . The structure will be explained below. As shown in FIGS. 1 and 3, 39 is an upper plate fixed to the upper surface of the bed part lb, and 4 is a pot lid attached to the front left end of the bed part lb so as to be openable and closable. , 41 is a needle plate fixed to the front part of the upper surface of the upper plate 39, which cooperates with the upper plate 39 to form a workpiece support surface on the upper surface thereof. A needle hole 41a for the general zigzag pattern and an opening (not shown) for the feed dog are formed as shown in Fig. IQ. Reference numeral 42 denotes a mounting opening formed at the front right side of the needle plate 41, and as shown in FIG.
2b is formed.

Reference numeral 43 denotes a lid plate that opens and closes the mounting opening 42 of the needle plate 41, and when the opening 42 is opened, the bed portion lb
It can be stored in an inclined position.

Reference numeral 45 designates an attachment for cutting the fabric edge which is mounted on the support plate portion 42b of the mounting opening □42, and the lower surface of the attachment frame 46 is provided with a metal fitting hole 42a of the support plate portion 42b. a pair of positioning protrusions 47 for positioning the cloth edge cutting attachment 45 at a predetermined position;
48 is provided protrudingly.

Reference numeral 49 denotes a locking bar rotatably attached to the right side of the attachment frame 46, and by rotating the locking bar 49, the fabric edge cutting attachment 45 can be opened with a needle. It can be fixed at a predetermined position on the plate 41.

58' The attachment frame 4 is arranged so that it is disposed close to the needle hole 41a of the needle plate 41 on the cloth feeding side.
61, the attached fixed blade; 51 is a movable blade attached to the tip of the drive arm 52 of the operating mechanism in the attachment frame 46 so as to cooperate with the fixed blade 50 to constitute a cutting operating section; When the fabric edge cutting attachment 45 is in a fixed arrangement state, it is operatively connected to a movement mechanism such as a shuttle drive mechanism provided in the bed section lb of the sewing machine frame 1, and the maximum swing of the sewing machine needle 6 occurs as the sewing machine is operated. Amplitude W
Cut the edge green of the fabric along the right side of the bipolar eye position.

In this embodiment, the positioning protrusion 48 on the right side of the lower surface of the attachment frame 46 is formed long so as to double as an operating protrusion for rotating the operating lever 35, as shown in FIG. When the cloth edge cutting attachment 45 is fixedly arranged at a predetermined position on the throat plate 41, this protrusion 48 engages with the operation piece 35a of the operation lever 35, and the operation lever 35 is pulled against the action of the tension spring 38. Then, the sewing machine needle 6 is rotated from the chain line position to the solid line position in the same figure, and as is clear from Figure 0, the swing base line of the sewing machine needle 6 is moved to a relatively large swing amplitude region L suitable for green stitching. At this time, the base line is temporarily changed to the right base line so as to match the edge cutting position of the work cloth by the cutting operation section.

The operation of the zigzag sewing machine constructed as described above will now be described.

First, if the attachment 545 for cutting the fabric edge is not mounted on the throat plate 41 and the attachment port 42 of the throat plate 41 is closed with the cover plate 43 for normal sewing work, the sewing machine frame 1 The operating lever 35 provided in the bed portion lb is moved to the chain line position in FIG. 3 by the action of the tension spring 38.
The switching member 29 mounted on the swinging member 12 is held stationary at the rest position shown in FIG. is engaged with the corresponding twill surface 12d.

In this state, use the operating knob (not shown) on the front of the sewing machine frame 1 to select one of the pattern cams 13 that corresponds to the desired stitch pattern.
When the sewing machine is operated after selecting the swing amplitude of the sewing machine needle 6 and adjusting the swing amplitude of the sewing machine needle 6 as appropriate using the operating knob 25 shown in FIG. The body 12 is oscillated, and the zero oscillation in the lateral direction is applied to the sewing machine needle 6 through the needle holder 21, etc., and the sewing machine needle 6 is caused to move as shown in FIG. It is oscillated at a predetermined amplitude about the oscillation reference line x1 based on the first rear surface 12d, and a desired stitch pattern is formed at the so-called center baseline. Next, attach the attachment 4 for cutting the fabric edge.
5. When performing green overlock stitching while cutting the edge of the work cloth using the needle plate 41 as shown in Figures 1 and 3,
When the mounting opening □42 is opened and the cloth edge cutting attachment 45 is fixedly placed in the predetermined position of the opening 42,
A positioning protrusion 48, which also serves as an operating protrusion, protrudes from the lower surface of the attachment frame 46 and engages with the operating piece 35a of the operating lever 35, and the operating lever 35 resists the action of the tension spring 38 as shown in FIG. It is routed from the dashed line position to the solid line position.

As a result, the operating arm 30 and the operating plate 31 on the front surface of the swinging body turtle 2 are moved upward via the operating lever 37, and the operating arm 30 and the operating plate 31 are moved upward via the operating lever 37.
The actuator 33a of No. 3 is moved upward within the sliding door-shaped space between the guide surface 12a of the swinging section body 12 and the left side surface of the sliding section section 29, and the sliding section section 29 is moved upward as shown in FIG. It is pivoted from the rest position to the operating position of FIG. In this state, the large-diameter engaging member 22 on the needle bar 21 engages with the second support surface 29a of the switching body 29, and the small-diameter engaging roller 2
3 is spaced apart from the first twill surface 12d of the swinging member 12,
The relative positional relationship of the needle bar 21 with respect to the swinging body 12 is changed to the right in the longitudinal direction of the needle bar 21. In this state, one of the pattern cams 13 corresponding to the stitch that has been completely passed through the green stitch is selected in substantially the same manner as described above, and the swing amplitude of the sewing machine needle 6 is adjusted to a value suitable for the green stitch as shown in FIG. When the sewing machine is operated with the setting set to an arbitrary value within the dynamic amplitude range L, the movable blade 51 of the cloth edge cutting attachment 45 is activated, and the sewing machine needle 6 is activated by the cooperative action of the movable blade 51 and the fixed blade 50. The edge green of the work cloth is cut along the right side of both extreme positions of the maximum swing amplitude W. Also, the swinging body 12 swings based on the rotation of the pattern cam 13 as the sewing machine operates, and the sewing machine needle 6 moves along the second swing line in FIG. 10, which is different from the swing reference line x1 in FIG. When the needle is oscillated about the oscillation reference line x 2 based on the rear surface 29a of A green overcast seam is formed along the so-called right base line so as to cross the cut green of the work cloth. Note that the present invention is not limited to the configuration of the embodiment described above, but can also be configured as follows.

(1) An arcuate rear surface 29a is formed over almost the entire length of the switching body 29 so that the swing base line can be changed over the entire range of the swing amplitude of the sewing machine needle 6 whose settings can be changed.

(2) The swing base line of the sewing machine needle 6 is configured to be changed by moving the switching body 29 using an actuation means different from the fixed positioning operation of the cloth edge cutting attachment in the above embodiment.

(3) In addition, the structure of each part may be arbitrarily changed and embodied without departing from the spirit of this invention.

As described in detail above, the present invention provides a method for controlling the relative positional relationship of the needle machine lever with respect to the swinging member without changing the position of the swinging axis of the swinging member that swings in synchronization with the main shaft of the sewing machine. By changing the longitudinal direction of the needle, the swing base line of the needle can be changed by rotating the cutting part body, so for example, it is possible to change the edge green of the work cloth. In some cases, it is possible to temporarily change the swing base line and form an orderly green seam along the edge of the work cloth.

Further, the sliding part body, which has a second abutting surface adjacent to the first rear surface and with which the needle can be operatively engaged, is moved in a position away from the swing axis of the swinging part body. It is attached to the swinging body so as to be able to rotate around the line and in a direction intersecting the first abutment surface, and the needle is attached to either the first or second abutment surface. In order to selectively engage the switching member, an actuating means is provided which engages with the free weave portion of the switching member and rotationally displaces the switching member. It is possible to reliably engage the needle-covered support surface with the applied support surface.Also, the selection operation of each support surface can be performed with each support surface constantly engaged with the needle-control surface. Because there is no
It is possible to reduce wear on each contact surface and needle handle,
In addition, the two contact surfaces can be arranged in a compact and simple configuration, thereby contributing to the simplification of the overall configuration of the sewing machine.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main part showing a zigzag sewing machine embodying the present invention with a cloth edge cutting attachment attached;
Fig. 2 is a partial vertical sectional view showing the arm of the sewing machine frame, Fig. 3 is a partial longitudinal sectional view showing the bed, and Fig. 4 is a partial longitudinal sectional view showing the arm of the sewing machine frame. FIG. 5 is a partially enlarged side view taken along line 5-5 in FIG. 4, and FIG.
The figures are a partial cross-sectional view taken along the line 6-6 of Figure 4, a partial cross-sectional view taken along the line 7-7 of Figure 5, a partial cross-sectional view of Figure 8 showing the operating state of Figure 6, and a partial cross-sectional view taken along the line 7-7 of Figure 5. Figures 1 and 10 are explanatory diagrams for explaining how the needle swing base line is changed in the case of normal sewing and green overlock stitching with the cloth edge cutting attachment attached.Sewing machine frame...・1, Needle machine...4, Sewing machine needle...6, Main shaft...7, Support shaft...
11a, Swinging body... 12, First twill surface...
... 12d, Needle Birch ... 21, Engagement child
22, engaging roller 23, switching body 29, second support surface 29a,
Operating pin...33, operating lever...35.
Figure 1 Figure 4 Figure N Boat chart Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] 1. A swinging member 12 supported by the sewing machine frame 1 and swinging around a single axis in synchronization with the main shaft 7 of the sewing machine, and a lateral direction according to the swinging of the swinging member 12. In order to impart a swinging motion to the needle 6, one end side is operatively engaged with a first contact surface 12d provided on the swinging member 12, and the other end side is operatively engaged with the first contact surface 12d provided on the swinging member body 12, and the needle bar 4 is attached at the other end side.
In a zigzag sewing machine equipped with a needle bar linking rod 21 operatively connected to a needle bar linking rod 21, a direction centered on an axis remote from the swing axis of the swing body 12 and intersecting the first contact surface 12d. The needle bar connecting rod 21 has a second contact surface 29a adjacent to the first contact surface 12d with which the needle bar connecting rod 21 can be operatively engaged. Switching body 29
and the needle bar connecting rod 21 is connected to the first or second contact surface 12d.
. A swing base line changing device characterized in that the swing base line of the needle 6 can be changed by rotation without changing the position of the swing axis of the swing body 12. 2 The actuating means 33 extends in the direction in which the first contact surface 12d is formed, and the actuation means 33 extends in the direction in which the first contact surface 12d is formed, and
2a. The oscillating base line changing device in a zigzag sewing machine according to claim 1, which is capable of moving by engaging with the zigzag sewing machine.