JP2002166082A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely pull out a thread from the needle hole of a needle plate when thread pulling-out movement is practiced after thread cutting is practiced. SOLUTION: In a sewing machine of the present invention in which a pattern can be sewn on a processing fabric by relatively moving a sewing needle 22 movable up and down and a supporting frame 16c for supporting the processing fabric, a thread cutting control means for practicing the thread cutting is provided and a thread pulling-out control means for practicing the thread pulling- out operation operating in such a way that the supporting frame 16c is once moved from a position where the thread cutting is practiced after the thread cutting is practiced and it is returned again to the position where the thread cutting is practiced is provided and when the supporting frame 16c is moved, the moving direction is controlled so as to be changed at least one time in the midway of the outward path or the inward path by the thread pulling-out control means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine that can sew a pattern on a work cloth by relatively moving a sewing needle that can move up and down and a support frame that supports the work cloth.

[0002]

2. Description of the Related Art An embroidery sewing machine, for example, can sew a pattern on a work cloth. In this embroidery sewing machine, when changing the thread or ending the sewing work,
The embroidery thread is cut by the thread cutting device. When this thread trimming is executed, the upper thread and the lower thread connected to the work cloth pass through the needle hole of the needle plate and remain on the lower side of the needle plate. When the next sewing is started in such a state, the thread remaining in the needle hole may adversely affect the sewing of the next sewing, and the quality of the sewn product may be deteriorated.

[0003] In order to prevent such a problem, a thread removing operation for removing a thread from a needle hole is performed after a thread trimming is performed. In this thread removal operation, the embroidery frame (support frame) supporting the work cloth is temporarily moved linearly, for example, 70 mm to the left from the position at the time of thread trimming.
This is an operation of returning to the position at the time of executing thread trimming again by linearly moving 70 mm in the right direction. When this thread removal operation is performed, the embroidery frame is moved leftward from the position at the time of performing thread trimming by 7 degrees.
When moved linearly by 0 mm, the thread can be pulled out from the needle hole.

[0004]

However, in the case of the above-mentioned conventional construction, after the embroidery frame is linearly moved 70 mm leftward from the position at the time of thread trimming, the embroidery frame is moved 70 m rightward.
When the thread is moved m linearly and returned to the position at the time of executing the thread trimming, the thread that has fallen out of the needle hole may return to the needle hole again. Then, when the next sewing is started in a state where the thread has returned into the needle hole, there is a problem that the quality of the sewn product deteriorates.

Accordingly, it is an object of the present invention to improve the quality of a sewn product by reliably removing a thread from a needle hole of a needle plate when performing a thread removal operation after performing a thread trimming. It is to provide a sewing machine which can be used.

[0006]

A sewing machine according to the present invention is capable of sewing a pattern on a work cloth by relatively moving a sewing needle which can move up and down and a support frame for supporting the work cloth. A thread trimming operation for moving the support frame once from the position at the time of thread trimming and returning to the position at the time of thread trimming again after executing the thread trimming. The thread removing control means is provided, and the thread removing control means is characterized in that, when the support frame is moved, the direction of movement is changed at least once in the course of a forward pass or a return pass.

[0007] According to the above configuration, after executing the thread trimming,
When the thread removing operation is performed by the thread removing control means, when the support frame is moved, the moving direction is changed at least once in the middle of the forward path or the backward path. When you return to the hour position,
It is possible to reliably prevent the thread that has fallen out of the needle hole from returning to the needle hole again.

In the case of this configuration, it is preferable that the support frame is moved by the thread removal control means so that the movement locus of the support frame becomes a polygon such as a triangle or a quadrangle.

[0009] It is further preferable that the support frame is moved by the thread removal control means so that the locus of movement of the support frame becomes an arc.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, the present embodiment is a configuration when the present invention is applied to a multi-head embroidery sewing machine having three embroidery sewing machines.

A general configuration of the multi-head embroidery sewing machine M will be described with reference to FIG. As shown in FIG. 2, a sewing machine support 2 is disposed on the rear side of the upper surface of the base frame 1 that is long in the left-right direction (X direction). A support frame 3 extending in the left-right direction is provided upright on the upper portion of the sewing machine support base 2.

Head units 4 to 6 are provided above the pace frame 1 located at the front end of the sewing machine support 2. Cylindrical beds 7 to 9 are provided at lower positions corresponding to the heads 4 to 6. In this case, the embroidery sewing machine M1 is
Similarly, the embroidery sewing machine M2 is composed of a head section 5 and a bed section 8, and the embroidery sewing machine M3
Is composed of a head 6 and a bed 9.

At the front end side of each of the heads 4 to 6, a needle bar case 10 movable in the left-right direction is provided. In the needle bar case 10, for example, 12 needle bars 21 arranged in a line in the left-right direction are supported so as to be vertically movable, and 12 balances 12 are movably supported. Each needle bar case 10 is simultaneously moved in the left-right direction by a needle bar changing mechanism (not shown) for changing the needle bar, and is configured to be simultaneously changeable to another upper thread having a different color. ing.

On the front side of the sewing machine support 2, a working table 13 is provided horizontally so as to be flush with the upper surfaces of the beds 7 to 9. This work table 13
A pair of auxiliary tables 14 and 15 are provided on both the left and right sides. A movable frame 16 having a rectangular shape in a plan view and extending in the left-right direction is placed on substantially the entirety of the auxiliary tables 14 and 15 and the work table 13.

The driving frame 16a on the right end and the driving frame 16b on the left end of the movable frame 16 are moved in the X-axis direction (right and left in FIG. 2) by an X-axis driving mechanism (not shown). Direction) and a Y-axis drive mechanism (not shown) to move in the Y-axis direction (front-rear direction in FIG. 2).

The movable frame 16 has embroidery sewing machines M1 to M1.
A cloth support frame 16c as a support frame corresponding to M3 is attached thereto. In this configuration, as the movable frame 16 is moved on the XY plane by the X-axis drive mechanism and the Y-axis drive mechanism, the cloth support frame 16c is also moved in the X-axis and Y-axis directions. Has become.

A plurality of bobbins C1 are rotatably mounted on a bobbin table C0 mounted above the sewing machine support base 2. Upper thread C2 supplied from each thread winding C1
Is configured to be supplied to the needle bar 21 via the corresponding balance 12 and the like. Further, on the rear side of the auxiliary table 15, an operation panel 18 provided with a liquid crystal display 17 for displaying a message relating to embroidery sewing and a plurality of switches (not shown) is provided.

Next, the needle bar vertical movement mechanism K1 provided for each of the embroidery sewing machines M1 to M3 will be briefly described with reference to FIG. The needle bar vertical movement mechanism K1 is a mechanism for moving the needle bar 21 up and down in synchronization with the main shaft 19 of the sewing machine. That is, the needle bar vertical movement mechanism K1 is a mechanism for moving the sewing needle 22 attached to the lower ends of the twelve needle bars 21 up and down.

A sewing machine main shaft 19 is disposed on the rear side in the needle bar case 10 so as to extend in the left-right direction through the respective head portions 4 to 6. The sewing machine spindle 19 includes
The eccentric cam 32 is attached.
The lower end of the eccentric lever 33 externally fitted on the
It is connected to.

At the tip of each of the heads 4 to 6, a base needle bar 26 extending vertically is provided. The base needle bar 26 has a needle bar case at its upper end and lower end. 10
Supported by an inner frame (not shown). The base needle bar 26 has an engagement groove 2 that engages with a connection pin 34 described later.
A vertically moving member 27 having 7a is inserted so as to be vertically movable. The needle holder 28 provided at the lower end of the vertically moving member 27 is connected to a link 31 connected to the tip of a swing lever 30 movably supported on a pivot 29.

A connecting pin 34 is fixed to a substantially middle portion of each needle bar 21 in the height direction, and a compression spring 35 is provided between the connecting pin 34 and the support frame 10 a of the needle bar case 10. Is externally fitted. The needle bar 21 is elastically biased by the compression spring 35 so that the needle bar 21 is always located at the upper needle position.

Further, when the needle bar case 10 moves in the left-right direction, the connecting pin 34 of the needle bar 21 facing the vertical moving member 27 is selectively engaged with the engaging groove 27a of the vertical moving member 27. It is configured to: In the case of this configuration, FIG.
When the sewing machine main shaft 19 is rotated by the rotation of the sewing machine motor 80 in the predetermined rotation direction shown in FIG.
The vertically moving member 2 is moved through the swing lever 30 and the link 31.
The needle 7 and the needle bar holder 28 are moved up and down integrally, and accordingly, the vertically moving member 2 is connected via the connecting pin 34.
The needle bar 21 connected to the sewing machine 7 is reciprocated in the vertical direction in synchronization with the main shaft 19 of the sewing machine.

Here, the needle bar jump mechanism 40 provided in each of the embroidery sewing machines M1 to M3 will be described with reference to FIG. The needle bar jump mechanism 40 is used when the needle bar 21 is jumped to its uppermost position (top dead center position) to change the needle bar 21 connected to the vertical moving member 27.

In the needle bar case 10, a solenoid needle 41 for a needle bar jumbeing in a horizontal direction is provided, and a rotation lever 42 substantially L-shaped in plan view is provided so as to be rotatable about a vertical axis. It is attached to the case 10. The driving portion 42a of the rotary lever 42 is in contact with the plunger of the solenoid 41 for the needle bar jamb. Further, a vertically extending operation shaft 43 attached to the driven portion 42b of the rotary lever 42 is configured to be able to engage with a protruding engagement portion 27b formed integrally with the vertical movement member 27. I have.

The up-and-down moving member 27 is rotatable between a normal connection position indicated by a solid line and a jump position rotated by a predetermined angle counterclockwise from the connection position in a plan view. The vertically moving member 27 is always urged by a winding spring 44 provided at an upper end thereof so as to rotate from this jump position to a normal connection position.

Thus, when the needle bar 21 is connected to the up-and-down moving member 27 via the connecting pin 34, the solenoid 41 for the needle bar jamb is driven for a predetermined time, and the plunger advances rightward. When the rotation lever-4
2 is rotated clockwise in a plan view, and the vertically moving member 27 is simultaneously rotated to the jump position via the operation shaft 43 and the pedestal 27b. As a result, the engagement between the connection pin 34 and the engagement groove 27a is released, and at the same time, the needle bar 21
Is configured to be raised (jumped) to the needle upper position at once by the compression spring 35.

On the other hand, while the needle bar 21 has jumped to the needle upper position and the vertical moving member 27 has returned to the connection position, the vertical moving member 27 rises from below toward the almost uppermost position. In some cases, the vertically moving member 27 abuts on the connection pin 34 from below, and temporarily rotates to the jump position. It is configured to automatically connect to Here, the presser foot 45 provided in each of the bed portions 7 to 9 has a presser position for pressing the work cloth C3 on the bed portions 7 to 9 by a presser foot driving mechanism (not shown), and a retreat position which has been raised by a predetermined distance. It is possible to switch between up and down.

The bead portions 7 to 9 will be described with reference to FIGS. The pad case 50 having a substantially U-shaped cross section extends in the front-rear direction, and its rear end is attached to a pair of support brackets 51 fixed to the base frame 1 located on the front end side of the sewing machine support base 2. On the front end side of the base frame 1, a full rotary hook 5 for catching a thread wheel is provided.
5 are provided. The full rotary hook 55 rotates in synchronization with the sewing machine main shaft 19 by receiving rotation of a hook shaft (not shown). In addition, bed case 5
The upper side of the cover plate 53 has a front end portion covered with the needle plate 52 and a remaining portion connected to the needle plate 52.
Covered with. The needle plate 52 has a needle hole 52a.

Next, the thread cutting mechanism 60 provided in each of the beds 7 to 9 will be described with reference to FIGS. As shown in FIG. 6, the thread cutting mechanism 60 is a mechanism for cutting the upper thread C2 and the lower thread C4. This thread cutting mechanism 60
Is configured to be activated when exchanging the upper thread C2 or cutting the upper thread C2 and the lower thread C4 connected to the work cloth C3 at the end of the embroidery sewing. Needle plate 5
On the lower surface of 2, a movable blade 61 is pivotally supported in the arrow direction between a standby position indicated by a solid line in FIG. 5 and a rotation position indicated by a two-dot chain line. The fixed blade 62 for cutting the upper thread C2 and the lower thread C4 in cooperation with the movable blade 61 is attached to the lower side of the needle plate 52 so as to face the upper side of the movable blade 61. .

The thread cutting lever 63 connected to the movable blade 61 extends rearward so as to pass through the bed case 50. In the case of this configuration, as shown in FIG. 4, when the thread cutting motor 64 provided at the left end of the base frame 1 is driven, the fan-shaped swing member 66 meshing with the drive gear 65 swings. The thread cutting operation shaft 67 is moved in the left-right direction, and the thread cutting operation lever 63 is driven in the front-rear direction via the rotating plate 68. By the operation of the operating lever 63, the movable blade 6
As a result, the fixed blade 62 and the movable blade 61 cut the upper thread C2 and the lower thread C4 at the same time.

Next, the electrical configuration of the multi-head embroidery sewing machine M will be described with reference to FIG. FIG. 7 is a block diagram showing an electrical configuration of the multi-head embroidery sewing machine M. As shown in FIG. 7, the multi-head embroidery sewing machine M
A drive circuit 81 for driving a sewing machine motor 80; A drive circuit 87 for driving the X-axis drive motor 86, a drive circuit 89 for driving the Y-axis drive motor 88, and a needle bar changing motor 84 for changing the needle bar 21 by moving the needle bar case 10 are provided. A drive circuit 85 for driving and a drive circuit 90 for driving the thread cutting motor 64 are provided.
The drive circuits 81, 85, 87, 89, 90 are respectively connected to the control device 70.

Then, the control device 70 includes a CPU 71, R
An OM 72 and a RAM 73 are provided.
1. The ROM 72 and the RAM 73 are connected to each other via a bus such as a data bus and to an input / output interface (not shown). This control device 70
However, it has each function as the thread cutting control means and the thread removal control means of the present invention.

The ROM 72 stores embroidery data relating to each of a large number of embroidery patterns. Based on the embroidery data, a embroidery control for driving the Y-axis drive motor 88 or the X-axis drive motor 86 to perform embroidery. A program, a control program for thread removal to be described later, and the like are stored. Also, R
The AM 73 is provided with various memories 73 a including a work memory for storing embroidery data necessary for embroidery sewing of the embroidery pattern, and temporarily stores a calculation result of the movement amount of the movable frame 16 calculated by the CPU 71. Various memories 73b that store information
And so on. The data stored in these memories 73a and 73b is taken out by the CPU 71 as needed and used for sewing and thread removal.

Further, regarding the head portion 4, the needle bar case 1
0, a drive circuit 76 for the needle bar jump solenoid 41 for the needle dedicated jumping mechanism 40, a drive circuit 78 for a presser foot drive solenoid 77 for retracting the presser foot 45, and thread breakage. A sensor 79 is provided. These drive circuits 76 and 78 and the thread break sensor 7
9 is connected to the control device 70.

Similarly, the heads 5 and 6 are provided with solenoids 41 and 77, drive circuits 76 and 78, a thread break sensor 79, and the like.

The thread break sensor 79 detects the upper thread C2
This is for detecting the disconnection. Specifically, an encoder disk (not shown) is rotatably provided in the yarn path of the upper thread C2, and the upper thread C2 is wound around a rotation drive unit of the encoder disk. The thread break sensor 79 is provided so as to face the encoder disk, and is configured to output an encoder signal when the encoder disk rotates. In the case of this configuration, the upper thread C for each sewing cycle
Since the encoder disk rotates with the feed-out of 2, the thread break sensor 79 outputs an encoder signal,
As long as no thread break occurs, the encoder signal is
0 is input.

Further, the control device 70 includes a sewing machine spindle 19.
One rotation of the disk encoder provided at
A pulse generator 82 that outputs an encoder signal composed of 00 pulse signals and a spindle origin sensor 83 that outputs one spindle synchronization signal with one rotation of the disk encoder are connected.

Next, the multi-head embroidery sewing machine M having the above-described structure.
The control of the sewing operation performed by the control device 70 will be described with reference to FIGS. Here, the flowchart of FIG. 8 shows the control contents of the sewing process (sewing operation) executed by the control device 70. The flowchart in FIG. 9 shows the control content of the thread removal operation process executed by the control device 70.

FIGS. 10 and 11 are explanatory views showing a state in which the work cloth C3 is sewn by the sewing needle 22.
FIG. 10 shows a state in which the upper thread C2 and the lower thread C4 extending from the work cloth C3 have been cut after the seams A1, A2 and A3 have been formed, and FIG.
6C shows a state in which the upper thread C2 and the lower thread C4 extending from the work cloth C3 have been pulled out from the needle hole 52a of the needle plate 52 by moving 6c.

When the sewing process is started, first, in step S10 of FIG. 8, data of one stitch is read from the sewing data (embroidery data). Then, it is determined whether or not the read data is thread trimming data (step S12). Here, if the data is not the thread trimming data, the process proceeds to "NO" in step S12, and the sewing processing of the data of one stitch read is executed (step S14).

On the other hand, if the read data is thread trimming data, the process proceeds to "YES" in step S12 to execute thread trimming (step S14). In this case, the control device 70 controls the thread trimming motor 6
The thread cutting mechanism 60 is operated by energizing the 4 to cut the upper thread C1 and the lower thread C2 by the movable blade 61 and the fixed blade 62. This cut state is shown in FIG.

Subsequently, the flow advances to step S18 to execute a thread removing operation. In the thread removing operation, after the thread trimming is performed, the cloth support frame 16c is temporarily moved from the position at the time of the thread trimming to another position.
This is a process for operating to return c to the position at the time of thread trimming execution. The processing of the thread removing operation will be described with reference to FIG.

In this case, the process first proceeds to step S50 in FIG. 9, and the cloth support frame 16c is moved to the current position (that is, the position at the time of executing the thread trimming) + (+ 70 mm, 0 mm).
By this movement, the position of the cloth support frame 16c is moved with respect to the sewing needle 22 so as to draw a horizontal linear locus as indicated by P1 in FIG. By the movement of the cloth support frame 16c, the upper thread C2 and the lower thread C extending from the work cloth C3.
4 comes out of the needle hole 52a of the needle plate 52 (FIG. 1).
1).

Next, the process proceeds to step S52, where the cloth support frame 16c is moved to the current position (that is, the position at the time of executing the thread trimming + (+ 7).
0mm, 0mm) position) + (-70mm, -70m
Move to position m). With this movement, the position of the cloth support frame 16c is moved with respect to the sewing needle 22 so as to draw a linear locus in an oblique direction as indicated by P2 in FIG.

Subsequently, the flow advances to step S54 to move the cloth support frame 16c to the current position (that is, the position at the time of executing the thread trimming + (+ 7).
(0 mm, 0 mm) + (− 70 mm, −70 mm) position) + (0 mm, +70 mm). By this movement, the position of the cloth support frame 16c is moved with respect to the sewing needle 22 so as to draw a vertical linear locus as indicated by P3 in FIG. As a result, the cloth support frame 16
c returns to the original position, that is, the position at the time of executing the thread trimming.

In this case, even if the cloth support frame 16c returns to the position where the thread trimming is executed, the cloth support frame 16c is moved so that the movement locus of the cloth support frame 16c becomes substantially triangular as shown in FIG. Therefore, it is possible to reliably prevent the upper thread C2 and the lower thread C4 extending from the work cloth C3 from returning to the inside of the needle hole 52a of the needle plate 52, and to maintain the state in which the thread has come off. That is, by making the movement locus triangular, the upper thread C2 and the lower thread C4 are moved in such a manner as to rotate the upper thread C2 and the lower thread C4 around the end point of the last stitch A3 in a horizontal plane. Can be prevented from returning to the inside of the needle hole 52a.

In the case of the above configuration, as shown in FIG. 1, when the moving trajectories P1, P2 and P3 of the moving trajectories P1, P2 and P3 of the cloth support frame 16c are regarded as the forward path, and the moving trajectory P3 is regarded as the backward path. It can be said that the moving direction of the cloth support frame 16c is changed once in the middle of the outward path. If the movement path P1 is regarded as the forward path and the movement paths P2 and P3 are regarded as the backward paths, it can be said that the movement direction of the cloth support frame 16c is changed once in the middle of the backward path.

According to this embodiment having such a configuration, when performing the thread removing operation after performing the thread trimming, when the cloth support frame 16c is moved, the moving direction is changed in the middle of the forward path or the backward path. In this case, when the cloth support frame 16c is returned to the position at the time of performing the thread cutting, the thread that has fallen out of the needle hole 52a of the needle plate 52 is again in the needle hole 52a. It can be reliably prevented from returning to. Therefore, the quality of the sewn product can be improved.

In the above embodiment, the movement trajectory of the cloth support frame 16c is triangular. However, the present invention is not limited to this. good. Further, instead of making the moving locus of the cloth support frame 16c a straight line, the moving locus may be a curved line (for example, an arc shape). 12 and 13 show an embodiment in which the movement locus of the cloth support frame 16c is formed in an arc shape.

In the second embodiment of the present invention shown in FIG.
The movement locus P4 of the cloth support frame 16c on the outward path is arc-shaped, and the movement locus P5 of the cloth support frame 16c on the return path is also arc-shaped. In the case of this configuration, it can be said that the movement direction of the cloth support frame 16c is changed one or more times (many times) in the middle of the forward path and the return path.
The configuration of the second embodiment other than that described above is the same as the configuration of the first embodiment. Therefore, in the second embodiment, substantially the same operation and effect as in the first embodiment can be obtained.

As shown in FIG. 12, the cloth support frame 16c
Instead of the arc P5, the oblique straight line P6 (see the broken line in FIG. 12) may be used. Further, the movement locus of the cloth support frame 16c on the outward path, the arc-shaped P
Instead of 4, a straight line in an oblique direction may be used, and the movement locus of the return path may be an arc.

In the third embodiment of the present invention shown in FIG.
The movement locus P7 of the cloth support frame 16c is circular. In the case of this configuration, it can be said that the moving direction of the cloth support frame 16c is changed one or more times (many times) in the middle of the outward or return trip.
The configuration of the third embodiment other than the above is the same as the configuration of the first embodiment. Therefore, in the third embodiment, substantially the same operation and effect as in the first embodiment can be obtained.

[0053]

As will be apparent from the above description, the present invention is characterized in that after the thread trimming is executed, when the thread removing operation is executed by the thread removing control means, the supporting frame is moved in the moving direction. Is changed at least once in the middle of the forward path or the return path, so that when the support frame is returned to the position at the time of executing the thread trimming, the thread that has fallen out of the needle hole returns to the needle hole again. This has an excellent effect that it can be reliably prevented from being performed.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention, and is a diagram showing a movement locus of a cloth support frame with respect to a needle.

FIG. 2 is a perspective view showing the overall configuration of a multi-head embroidery sewing machine.

FIG. 3 is a perspective view showing the vicinity of a needle bar and a needle bar vertical mechanism.

FIG. 4 is an enlarged plan view showing a work table of the embroidery sewing machine;

FIG. 5 is an enlarged plan view showing the tip of the bed of the embroidery sewing machine.

FIG. 6 is an enlarged front view showing a rotary hook provided on a bed portion of the embroidery sewing machine;

FIG. 7 is a block diagram of an embroidery sewing machine.

FIG. 8 is a flowchart of a sewing process.

FIG. 9 is a flowchart of a thread removal operation process.

FIG. 10 is a diagram showing a state in which an upper thread and a lower thread extending from a work cloth are cut;

FIG. 11 is a diagram showing a state in which an upper thread and a lower thread extending from a work cloth are pulled out from a needle hole of a needle plate;

FIG. 12 is a view corresponding to FIG. 1, showing a second embodiment of the present invention;

FIG. 13 is a view corresponding to FIG. 1, showing a third embodiment of the present invention;

[Explanation of symbols]

M is a multi-head embroidery sewing machine, M1, M2, and M3 are embroidery sewing machines, 1 is a base frame, 4, 5, and 6 are heads, 7,
8 and 9 are bed sections, 10 is a needle bar case, 12 is a balance, 1
6 is a movable frame, 16c is a cloth support frame (support frame), 19 is a sewing machine spindle, 21 is a needle bar, 22 is a sewing needle, 40 is a needle bar jump mechanism, 41 is a needle bar jam solenoid, 45 is a presser foot, and 52 is a presser foot. Is a needle plate, 52a is a needle hole, 55 is a full rotary hook, 60
Is a thread cutting mechanism, 61 is a movable blade, 62 is a fixed blade, 63 is a thread cutting operation lever, 64 is a thread cutting motor, 70 is a control device (thread cutting control means, thread removing control means), 80 is a sewing machine motor, 86 denotes an X-axis drive motor, and 88 denotes a Y-axis drive motor.

Claims (3)

[Claims] 1. A sewing machine which can sew a pattern on a work cloth by relatively moving a sewing needle that can move up and down and a support frame that supports the work cloth. After performing the trimming, the thread adjusting device performs a thread removing operation for temporarily moving the support frame from the position at the time of performing the thread trimming and returning the support frame to the position at the time of performing the thread trimming. A sewing machine characterized in that, when the support frame is moved, the removal control means changes the moving direction at least once in the middle of a forward pass or a return pass. 2. The sewing machine according to claim 1, wherein the thread removing control means moves the support frame such that a movement locus of the support frame is a polygon such as a triangle or a quadrangle. 3. The sewing machine according to claim 1, wherein the thread removing control means moves the support frame so that the movement locus of the support frame is an arc.