JPH11267389A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly perform thread passing action. SOLUTION: When thread change data are detected during the execution of embroidering action, the embroidering action is stopped. Thereafter, when a knee lifter lifting lever is operated to pass a thread through a needle, whether or not an embroidery frame 55 has entered a thread passing region S1 is determined. The thread passing region S1 is obtained by projecting the operating region of a thread passing device onto X-Y coordinates, and if the embroidery frame 55 has entered the thread passing region S1, the embroidery frame 55 automatically moves out of the thread passing region S1. Therefore, thread passing action is performed smoothly without being obstructed by the embroidery frame 55.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine configured to move a sewing object relatively to a sewing needle.

[0002]

FIG. 16 shows an example of the sewing machine. Here, the needle bar base 1 is provided in the sewing machine frame.
The needle bar 2 is mounted on the needle bar base 1 so as to be vertically movable. An operating body 3 is mounted on the needle bar base 1 so as to be movable up and down.
a is provided, and an inclined cam groove 3b is provided in the cylindrical portion 3a.

[0003] A threading shaft 4 is inserted into the cylindrical portion 3a. A hook 5 is attached to the lower end of the threading shaft 4, and a cam pin 6 is attached to the upper end. The cam pin 6 is engaged in the cam groove 3b. A presser spring 7 is fitted around the outer periphery of the threading shaft 4 between the cam pin 6 and the upper wall of the cylindrical portion 3a.
Urges the cam pin 6 downward and holds it at the lower end in the cam groove 3b.

A sewing needle 8 is mounted on the lower end of the needle bar 2, and an upper thread 9 (both in FIG. 18) is inserted into an eye 8a of the sewing needle 8.
To pass the thread, the upper thread 9 is set on the thread tension mechanism and the balance, and the left hand is put on the operating body 3 to push down the operating body 3. Then, the threading shaft 4 descends while the cam pin 6 is held at the lower end in the cam groove 3b, and the threading shaft 4
Stops when it comes into contact with the positioning member 10. In this state, as shown in FIG. 18A, the hook 5 is located behind the sewing needle 8 and positioned at the same height as the eye 8a.

When the operating body 3 is further depressed, the cam pins 6
Is pressed by the inner surface of the cam groove 3b, and the threading shaft 4 rotates. Then, the hook 5 rotates integrally with the threading shaft 4 and enters the eye 8a of the sewing needle 8. After this, FIG.
As shown in FIG. 18, the upper thread 9 is hooked on the hook 5a of the hook 5 as shown in FIG. Then, the hook 5 rotates in the opposite direction integrally with the threading shaft 4, and the upper thread 9 is pulled out from the eye 8 a of the sewing needle 8 as shown in FIG.

FIG. 19 shows another sewing machine disclosed in Japanese Patent Publication No. Hei 7-71596. In the case of this sewing machine, the thread tension member 11 is configured to guide the hook 5a of the hook 5 while tensioning the upper thread 9 instead of the operator's right hand, and the operator simply presses down the operating body 3 with the left hand. The upper thread can be passed through the eye 8a of the sewing needle 8.

In the case of each of the sewing machines described above, for example, when a large embroidery pattern is to be formed using a large embroidery frame, the moving range of the embroidery frame becomes large, and the embroidery frame may approach the sewing needle 8. Then, the hook 5 or the thread tension member 11 interferes with the embroidery frame at the time of threading, the embroidery frame becomes a hindrance when the sewing needle 8 is replaced with both hands, or the embroidery frame is replaced when the cloth presser is replaced with both hands. It may be in the way, and generally the sewing needle 8
It was difficult to perform maintenance work in the vicinity.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sewing machine capable of easily performing a maintenance operation near a sewing needle.

[0009]

According to a first aspect of the present invention, there is provided a sewing machine comprising: a moving means for moving an object to be sewed relative to a sewing needle; an operating means for performing an operation relating to sewing;
Detecting means for detecting the operation of the operating means, and controlling means for relatively moving at least a part of the moving means to a predetermined retreat direction or a predetermined retreat position based on the detection of the operation of the operation means And has a feature. According to the above means, when the operating means is operated, at least a part of the moving means relatively moves to the predetermined retreat direction or the predetermined retreat position, and the space near the sewing needle is enlarged. For this reason, it becomes easy to perform maintenance work near the sewing needle without separately performing an operation for moving the moving means.

According to a second aspect of the present invention, the operating means includes a presser lifting operation, a threading operation, a lower thread replacing operation, an upper thread thread replacing operation, a lifting operation, a thread cutting operation, an automatic threading operation, and a stopping operation. It is characterized in that at least one of them is executed. According to the above means, the operating means is operated when executing the presser lifting operation, the threading operation, the lower thread replacing operation, the upper thread spool replacing operation, the presser lifting operation, the thread trimming operation, the automatic threading operation, and the stop operation. Then, at least a part of the moving means relatively moves, and the space near the sewing needle is enlarged, so that the above-described maintenance work can be easily performed.

According to a third aspect of the present invention, the control means determines whether or not the moving means is in a threading area related to the threading device, and determines that at least a part of the moving means is in the threading area. When detecting, at least a part of the moving means is relatively moved to a predetermined retreat direction or a predetermined retreat position. According to the above-mentioned means, when the moving means is in the threading area, at least a part of the moving means moves, and a space near the sewing needle is enlarged. It is performed without interruption by means.

According to a fourth aspect of the present invention, there is provided a sewing machine comprising: an embroidery frame for holding a sewing object; control means for forming an embroidery pattern on the sewing object based on movement control of the embroidery frame; A threading device for passing the upper thread through the threading device, and when the control means detects that the embroidery frame is in the threading region related to the threading device during threading, the control unit moves the embroidery frame out of the threading region. The feature is that it is moved to the evacuation position. According to the above means, when the embroidery frame is in the threading area at the time of threading, the embroidery frame is automatically retracted out of the threading area. Therefore, in particular, the threading operation by the threading device is reliably performed without being disturbed by the embroidery frame.

The sewing machine according to the fifth aspect is characterized in that the control means selectively moves the embroidery frame to a retracted position outside the threading area and a retracted position outside the maintenance area. According to the above means, since the embroidery frame is selectively moved out of the maintenance area, in addition to the threading operation by the threading device, maintenance work such as replacement of sewing needles and replacement of the presser foot is not disturbed by the embroidery frame. It can be done smoothly.

According to a sixth aspect of the present invention, the sewing machine further comprises an upper thread sensor for detecting a supply state of the upper thread to the sewing needle, and the control means detects a break of the upper thread based on an output signal from the upper thread sensor. Accordingly, it is characterized in that it is determined that the embroidery frame is in the threading area and the embroidery frame is moved to a retreat position outside the maintenance area. According to the above means, when the upper thread breaks, the embroidery frame automatically moves out of the maintenance area, so that it is easy to deal with thread breakage, needle breakage, and the like, which occur simultaneously with thread breakage.

A sewing machine according to a seventh aspect is characterized in that the control means sets a retreat position where the moving distance of the embroidery frame is the shortest. According to the above means, the embroidery frame moves by the shortest distance. For this reason, the time required for retracting the embroidery frame is reduced, and the work efficiency is improved.

The sewing machine according to the present invention is characterized in that the control means returns the embroidery frame to the pre-evacuation position when performing the embroidery operation after the embroidery frame is retracted. According to the above means, the embroidery operation can be resumed by returning to the needle drop point where the thread change or thread breakage has occurred, so that the finished state of the embroidery pattern is improved.

According to a ninth aspect of the present invention, there is provided a sewing machine comprising: a presser lifting lever for separating a work clamp from a work cloth; and a presser lifting sensor for detecting a state of the presser lifting lever. It is characterized in that it is determined whether or not the embroidery frame is within the threading area by detecting the operation of the presser lifting lever based on the signal. According to the above means, the embroidery frame automatically retracts when the operator operates the presser lifting lever for executing threading.

According to a tenth aspect of the present invention, the sewing machine further comprises a thread cutting mechanism for cutting the upper thread, and the control means detects an operation signal for operating the thread cutting mechanism, so that the embroidery frame is in the threading area. It has a feature in determining whether or not. According to the above-described means, the embroidery frame automatically retracts when the operator performs thread cutting.

In the sewing machine according to the eleventh aspect, the control means may include:
Along with detecting thread change data in embroidery data,
The feature is that it is determined whether the embroidery frame is in the threading area. According to the above means, the embroidery frame automatically retracts when the operator changes the thread when threading is performed.

According to a twelfth aspect of the present invention, the sewing machine further comprises a thread spool sensor for detecting a mounted state of the upper thread spool, and the control means detects the mounting or removal of the upper thread spool based on an output signal from the thread spool sensor. Accordingly, it is characterized in that it is determined whether or not the embroidery frame is in the threading area. According to the above means, the embroidery frame automatically retracts when the operator mounts or removes the upper thread spool for performing threading.

According to a thirteenth aspect of the present invention, the sewing machine further includes a lower thread sensor for detecting a winding state of the lower thread on the bobbin, and the control means detects breakage of the lower thread based on an output signal from the lower thread sensor. Accordingly, the embroidery frame is moved to an exposure position where the needle plate is exposed. According to the above means, when the bobbin thread runs out, the embroidery frame moves to the exposure position, and the needle plate is exposed. Therefore, the operation of replacing the bobbin by shifting the needle plate can be performed smoothly without being disturbed by the embroidery frame.

[0022]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. First, in FIG. 11, the sewing machine frame 21 includes a bed 21a and a bed 2
A pillar 21b extending upward from 1a, an arm 21c extending horizontally from the upper end of the pillar 21b, a head 21d located at the left end of the arm 21c, and a leftward projection from the bed 21a. And a free arm portion 21e.
Is mounted, and a start / stop switch 23 corresponding to an operation means is mounted on the head portion 21d.

As shown in FIG. 9, a holding rod 24 is mounted in the head portion 21d so as to be vertically movable. The lower part of the presser bar 24 protrudes downward from the head portion 21d, and a cloth presser 25 is detachably attached to the lower end of the presser bar 24. As shown in FIG. 8, a holding spring 26 is housed in the head portion 21d. The upper end of the presser spring 26 is attached to the sewing machine frame 21 and the lower end thereof is attached to the presser bar 24. The presser spring 26 urges the presser bar 24 downward, and as shown in FIG. The presser 25 is held at a lower position where the presser 25 is pressed against the upper surface of the needle plate 22.

The head portion 21d has a presser lifting lever 27
Is mounted so as to be rotatable about a shaft 27a. The presser-lift lever 27 corresponds to an operating means for performing an operation related to sewing. The presser-lifter lever 27 is formed with a cam surface 27b having a "-" shape. It is exposed from the portion 21d.

A presser bar clamp 28 is fixed to the presser bar 24 in the head portion 21d. This presser bar holder 28 has a cam surface 28a in the shape of a "ku".
When the presser-lifting lever 27 is operated in the direction of arrow A from the lowered position, the presser-lifting lever 27 presses the presser bar holder 28, so that the presser bar 24 is integrated with the presser bar holder 28 by the spring force of the presser spring 26. The presser foot 25 and the needle plate 22
Is formed between them.

When the operation position of the presser lifting lever 27 reaches the ascending position, the cam surface 27b of the presser lifting lever 27 is moved to the cam surface 28 of the presser bar holding member 28, as shown by a two-dot chain line in FIG.
a is engaged in a surface contact state. In this state, the left side of the cam surface 27b of the presser lifting lever 27 is horizontal, and the presser lifting lever 27 is passed from the presser spring 26 through the presser bar holder 28.
A downward force acts on the rotation axis α of the rotation of the pressurizing lever 27, so that the rotational power of the presser lifting lever 27 disappears. Therefore, the presser lifting lever 27 is held at the raised position to support the presser bar holder 28 from below, so that the presser bar 24 and the cloth presser 25 are held at the raised position.

When the presser lift lever 27 is operated from the raised position to the uppermost position, the presser lift lever 27 is moved to the presser bar holding 2.
8, the presser bar 24 rises to the uppermost position against the spring force of the presser spring 26 integrally with the presser bar holder 28,
The gap between the presser foot 25 and the needle plate 22 increases. In this state, the presser-lifting lever 27 comes into contact with the presser bar holder 28 on the right side of the rotation axis α, and the presser spring 26 is supplied with the turning power in the direction indicated by the arrow A from the presser spring 26 through the presser bar holder 28. I have.

Accordingly, when the hand is released from the presser-lifting lever 27, the presser-lifting lever 27 rotates in the direction opposite to the arrow A and returns to the raised position. When the presser lifting lever 27 is operated in the direction indicated by the arrow A in this state, there is no member for supporting the presser bar hanger 28, and the presser bar 24 is lowered integrally with the presser bar hanger 28 by the spring force of the presser spring 26, and the cloth Presser 25 is needle plate 22
It returns to the lowered position pressed against the upper surface of the.

As shown in FIG. 8, a substantially L-shaped thread loosening plate 29 is disposed in the head portion 21d so as to be rotatable about a shaft 29a. A substantially triangular cam surface 27c is formed on the presser lifting lever 27, and when the presser lifting lever 27 is operated to the upward position in the direction of arrow A, the pressing surface 29b of the thread release plate 29 is pressed. The thread loosening plate 29 is rotated in the direction of arrow B by being pressed by the cam surface 27c of the 27.

A thread tension mechanism 30 is provided in the head portion 21d. The thread tension mechanism 30 has a pair of plates (not shown) and a thread tension spring (not shown) for pressing one of the plates against the other plate. Is pinched. The upper end of a rod 31 is rotatably connected to one plate of the thread tension mechanism 30.
The lower end of 1 is rotatably connected to the thread release plate 29. When the thread release plate 29 rotates in the direction of arrow B with the operation of the presser lifting lever 27 to the raised position, the rod 31 is pulled down. Can be Then, one plate is separated from the other plate against the spring force of the thread tension spring, and the upper thread held between the pair of plates is released.

When the presser lifting lever 27 is operated to the lower position in this state, the thread loosening plate 29 is rotated back in the direction indicated by the arrow B. Then, the rod 31 is pulled upward, and one of the plates is moved toward the other plate by the spring force of the thread tension spring, so that the upper thread is clamped again between the pair of plates.

A safety plate 32 has a shaft 32
When the presser lifting lever 27 is operated in the direction of arrow A from the lowered position, the pressing surface 32b of the safety plate 32 is moved to the cam surface 27 of the pressing lever 27.
c, the safety plate 32 rotates in the direction of arrow C by an amount corresponding to the operation amount of the presser lifting lever 27.

In the head portion 21d, a lever 33 is
It is mounted so as to be rotatable about 3a. This lever 3
Reference numeral 3 denotes a rotatably connected to the left end of the safety plate 32 (both are shown in a separated state). When the safety plate 32 rotates by an amount corresponding to the operation amount of the presser lifting lever 27,
The rotation amount of the safety plate 32 is transmitted to the lever 33, and the lever 3
3 rotates by an amount corresponding to the amount of rotation of the safety plate 32.

A safety device 34 is provided in the head portion 21d. The safety device 34 has a potentiometer (not shown). When the lever 33 rotates, an electric signal having a level corresponding to the amount of rotation of the lever 33 is output from the potentiometer. The safety device 34 has a limit switch. When the presser lifting lever 27 is operated to the raised position, the amount of rotation of the lever 33 reaches a predetermined value, and the limit switch is turned on.

A knee lever (not shown) is provided on the bed 21d.
Is rotatably mounted, and a lifter (not shown) is rotatably mounted on the head portion 21d. This lifter is connected to a knee lever via a link mechanism, and when the knee lever is operated with the right knee, the lifter rotates to push up the holding bar holder 28. Then, the presser foot 25 rises integrally with the presser bar 24 to the ascending position and the uppermost position.

As shown in FIG. 14, a control device 35 (corresponding to control means and detection means) mainly composed of a microcomputer is arranged in the sewing machine casing 21. The control device 35 includes a CPU 35a, a ROM 35b,
The RAM 35c, the input interface 35d, the output interface 35e, and the like are interconnected via a bus line 35f. The ROM 35b stores display data and the like in addition to various control programs.
The pointer 35c is provided with a pointer, a counter, a buffer, and the like for temporarily storing the calculation result calculated by the CPU 35a. In addition, the control device 35 detects the height position of the work clamp 25 as the output signal from the potentiometer is processed based on the control program.

As shown in FIG. 11, a liquid crystal display (LCD) 36 is mounted on the front surface of the arm portion 21c, and the control device 35 controls the LCD 36 based on a control program in the ROM 35b. A plurality of embroidery patterns and various messages are displayed.

An operation panel 37 is mounted on the front of the LCD 36. The operation panel 37 is made of a transparent electrode plate (touch panel). When the operation panel 37 is touched in the display state of the practical sewing pattern, the control device 35 determines which pattern has been touched. , And sets practical sewing data according to the detection pattern.

As shown in FIG. 3, a support shaft 38 is provided in the head portion 21d.
9 is rotatably mounted. Support portions 39a and 39b are provided on upper and lower portions of the needle bar base 39, and a needle bar 40 is supported by the support portions 39a and 39b so as to be vertically movable. The lower end of the needle bar 40 is shown in FIG.
As shown in FIG. 5, the needle bar 40 protrudes outside the needle bar 40, a sewing needle 41 is detachably attached to the lower end of the needle bar 40, and a needle bar clamp 42 is fixed to an intermediate portion of the needle bar 40 in the vertical direction. I have. Reference numeral 41b denotes an operation screw for attaching and detaching the sewing needle 41.

As shown in FIG. 3, a rod 43 is housed in the sewing machine frame 21, and a needle bar crank 44 is fixed to the tip of the rod 43. A needle bar crank rod 45 is rotatably connected to the needle bar crank 44 around a shaft 45a.
Is rotatably connected to the needle bar holder 42.

The sewing machine frame 21 is provided with a sewing machine motor 46 shown in FIG. A rod 43 as a main shaft is connected to a rotation shaft of the sewing machine motor 46. When the control device 35 detects an operation of the start / stop switch 23, the control device 35 operates the sewing machine motor 46. Then, rod 4
3 rotates, the rotational force of the needle bar crank 44 is transmitted from the needle bar crank rod 45 to the needle bar holder 42, and the sewing needle 41 moves up and down with a constant stroke integrally with the needle bar 40. still,
When the control device 35 detects that the limit switch of the safety device 34 is turned on, it determines that the work clamp 25 is at the raised position, and prohibits the driving of the sewing machine motor 46 even if it detects that the start / stop switch 23 is turned on.

A feed dog (not shown) is provided on the free arm portion 21e so as to be movable back and forth.
Is activated, the feed dog performs a predetermined cloth feeding motion in synchronization with the vertical movement of the sewing needle 41, and the work cloth (corresponding to the sewing object) pressed by the cloth presser 25 is moved forward or backward. Sent. The feed dog driving stepping motor 47 in FIG. 14 is for changing the moving stroke of the feed dog, and the control device 35 controls the feed dog driving stepping motor 47 to control the feed amount of the work cloth. Adjust

In the free arm portion 21e, a bobbin and a horizontal shuttle (both not shown) are disposed below the needle plate 22, and a bobbin thread is wound around the former bobbin. I have. The latter horizontal hook rotates in the horizontal direction in conjunction with the sewing machine motor 46. When the horizontal hook rotates, the blade point of the horizontal hook rotates through the upper thread wheel (through the work cloth and the needle plate 22).
The upper thread protrudes downward. Thereafter, when the upper thread crosses the lower thread of the bobbin, the upper thread separates from the horizontal shuttle. In this state, when a balance (not shown) rises, the upper thread loop is tightened, and a seam is formed on the work cloth.

As shown in FIG. 3, a hook 40a is attached to the needle bar 40, and an upper thread 48 (see FIG. 6) pulled out from an upper thread spool (not shown) of the sewing machine frame 21. )
Is inserted into the hook 40a via the thread tension mechanism 30, the thread take-up spring (not shown), and the balance (not shown), and then inserted into the eye 41a (see FIG. 7) of the sewing needle 41. Have been.

A needle bar swing mechanism (not shown) is provided in the sewing machine frame 21. The needle bar swinging mechanism uses the needle bar swinging stepping motor 49 shown in FIG. 14 as a drive source, and the control device 35 controls the needle bar swinging stepping motor when “jiggling” or the like is selected. 49 is driven and controlled, and the needle bar base 39 is swung in the left-right direction in synchronization with the vertical movement of the sewing needle 41, and the sewing needle 41 is swung in the left-right direction to form a stitch that is bent in a zigzag manner.

As shown in FIG. 11, a card connector 50 is provided in the pillar 21b. When the ROM card 51 is inserted into a card slot (not shown) of the pillar 21b. , The ROM card 51 is connected to the card connector 50. The ROM card 51 stores a plurality of embroidery data.
When the operation panel 37 is touched while a plurality of embroidery patterns are displayed on the CD 36, which embroidery pattern is touched is detected based on an output signal from the operation panel 37, and embroidery data corresponding to the touch pattern is detected. ROM
Read from card 51.

An embroidery device 52 corresponding to a moving means is detachably mounted on the free arm portion 21e. Hereinafter, the embroidery device 52 will be described. Free arm 2
1e, a main body frame 53 is detachably mounted. An embroidery head 54 is mounted on the main body frame 53 so as to be movable in an arrow X direction (a direction orthogonal to the work cloth feed direction). As shown in Figure 1,
An embroidery frame 55 made of synthetic resin is mounted so as to be movable in an arrow Y direction (a direction parallel to the work cloth feed direction).
This embroidery frame 55 is for holding a work cloth,
The embroidery head 54 is detachable.

An X-direction stepping motor 56 and a Y-direction stepping motor 57 shown in FIG. 14 are provided in the main body frame 53, and the embroidery head 54 is linked with the X-direction stepping motor 56 in the X direction shown in FIG. The embroidery frame 55 moves in the direction of the arrow Y in FIG. 1 in conjunction with the stepping motor 57 in the Y direction.

As shown in FIG. 12, a connector 58 is attached to the main body frame 53. This connector 5
8, a connector 59 (see FIG. 1) on the side of the sewing machine frame 21 when the main body frame 53 is mounted on the free arm portion 21e.
4), and the control device 35 supplies a pulse signal from the connector 59 on the sewing machine frame 21 to the X-direction stepping motor 56 and the Y-direction stepping motor 57 through the connector 58 on the embroidery device 52. Accordingly, the embroidery frame 55 is controlled to move in the arrow X direction and the arrow Y direction to form an embroidery pattern on the work cloth.

The embroidery data of the ROM card 51 is composed of coordinate data for defining an embroidery pattern, and the controller 35 calculates the needle drop point coordinates (X, Y) based on the embroidery data from the ROM card 51. Calculate. And the embroidery frame 5
5 is calculated based on the needle drop point coordinates (X, Y), and a pulse signal is set according to the calculation result.

A thread cutting mechanism (not shown) mainly composed of a knife is provided in the free arm portion 21e. As shown in FIG. 13, a thread trimming key 37a corresponding to an operating means is printed on the operation panel 37. The controller 35 controls the thread trimming key 37a based on an output signal from the operation panel 37. When the operation is detected, a thread cutting signal (operation signal) is output to the electromagnetic solenoid 60 in FIG. 14 to excite the electromagnetic solenoid 60. The electromagnetic solenoid 60 is equivalent to a drive source of the thread cutting mechanism. When the electromagnetic solenoid 60 is excited, the thread cutting mechanism is activated, and the upper thread and the lower thread are simultaneously cut immediately below the work cloth, and the machining is performed. Separated from cloth.

The embroidery data of the ROM card 51 includes thread change data for instructing replacement of the upper thread, end data for instructing the end of the embroidery operation, thread trimming data, and the like. This thread trimming data is located at the next stage of the thread change data and the end data. When the controller 35 detects the thread trimming data, it outputs a thread trimming signal and automatically operates the thread trimming mechanism. .

A thread break sensor 61 shown in FIG. 14 is provided in the sewing machine frame 21. The thread break sensor 61 corresponds to an upper thread sensor for detecting a supply state of the upper thread 48 from the upper thread block to the sewing needle 41.
When the upper thread break is detected based on the output signal from the thread break sensor 61, the sewing machine motor 46 is turned off during operation. When the operation is stopped, the driving of the sewing machine motor 46 is prohibited even if the start / stop switch 23 is operated.

A lower thread amount sensor 62 shown in FIG. 14 is provided in the sewing machine frame 21. The lower thread amount sensor 62 corresponds to a lower thread sensor that outputs an electric signal corresponding to the lower thread amount wound on the bobbin, and the controller 35 outputs an output signal from the lower thread amount sensor 62. , The sewing machine motor 46 is turned off during operation. When the operation is stopped, the driving of the sewing machine motor 46 is prohibited even if the start / stop switch 23 is operated.

A timing sensor 63 shown in FIG. 14 is provided in the sewing machine frame 21. This timing sensor 6
3 is the rotation angle of the main shaft at which the needle bar 40 reaches the needle up position (the position of the needle bar 40 when the presser lift lever 27 is operated to the raised position), and the needle lower position (the presser lift lever 27 is operated to the lowered position). The control device 35 outputs an electric signal at the rotation angle of the main shaft that reaches the position of the needle bar 40 when the control is performed.
When the sewing operation is stopped based on the end data in the embroidery data and the operation of the start / stop switch 23, the sewing machine motor 46 is turned off based on the output signal from the timing sensor 63, and the needle bar 40 is Position it in the upper position.

A presser-lifting sensor 64 (corresponding to a detecting means) shown in FIG. 14 is provided in the sewing machine frame 21. The presser lifting sensor 64 is composed of a microswitch whose state is changed according to the rotation position of the presser lifting lever 27. The control device 35 transmits the presser lifting lever 27 based on an output signal from the presser lifting sensor 64. Is operated to the raised position and that the presser lifting lever 27 is operated to the lowered position.

As shown in FIG. 10A, a cutter 65 is attached to the left side of the head 21d.
A guide groove 65a is provided between the cutter 65 and the head 21d.
Are formed. This cutting device 65 is provided in FIG.
As shown in FIG. 5, the upper thread 48 is inserted into the guide groove 65a from the hook 40a of the needle bar 40 and pulled toward the near side so as to be wound around the cutting device 65. Is pressed against the cutter 65b and cut.

As shown in FIG. 4A, a threading device 66 is provided in the head 21d. Hereinafter, the threading device 66 will be described in detail. A support shaft 67 is vertically disposed in the head portion 21d, and a movable table 68 is movably mounted on the support shaft 67. This moving table 68
A tension spring 69 is mounted between the head part 21d and the head part 21d, and the tension spring 69 urges the moving table 68 upward.

The movable base 68 is provided with a projecting detent part 68a, and a knob 70 is attached to the detent part 68a. The guide groove 21 is provided in the head portion 21d.
f is provided. A knob 7 is provided in the guide groove 21f.
When the knob 70 is pressed down along the guide groove 21f, the movable table 68 descends along the support shaft 67 in a detented state.

A connecting portion 68b is provided at the upper end of the moving table 68. The connecting portion 68b of the operating body 71 is provided on the connecting portion 68b.
1a are connected. The operating body 71 has a cylindrical portion 7.
1b is provided. The cylindrical portion 71b has an inner surface formed in a square shape, and a guide member 72 having a rectangular cross section is inserted into the cylindrical portion 71b. The guide member 72 is formed by pressing or drawing, and upper and lower ends of the guide member 72 are screwed to the needle bar base 39. Therefore, when the knob 70 is operated downward, the inner surface of the tubular portion 71b is locked by the guide member 72, and the operating body 71 descends integrally with the movable base 68 in a detented state.

The connecting portion 68b of the moving table 68 and the operating body 7
A gap is formed between the operating member 71 and the first connecting portion 71a. When the operating member 71 swings in the left-right direction integrally with the needle bar base 40, a gap is formed between the two connecting portions 71a. Moving table 68
Both are blocked to prevent transmission to

The operating body 71 is provided with a spring hook 71c, and the lower end of a tension spring 73 is hooked on the spring hook 71c. Further, a spring hook member 74 is attached to the needle bar base 40. The upper end of a pull spring 73 is hooked on the spring hook member 74, and the pull spring 73 urges the operating body 71 upward.

The operating body 71 is provided with a tubular portion 71d. The cylindrical portion 71d has a circular inner surface, and an upper end portion of a columnar threading shaft 75 is inserted into the cylindrical portion 71d so as to be vertically movable and rotatable.
As shown in FIG. 3, a semi-annular shaft insertion portion 39 d is provided at a lower portion of the needle bar base 39.
Is inserted into the shaft insertion portion 39d so as to be vertically movable and rotatable.

The lower end of the threading shaft 75 is provided at the lower end of FIG.
As shown in FIG. 7, the holding member 76 is fixed. A dish support piece 77 is fixed to the holding member 76. The dish support piece 77 is formed with a thread guide portion 77a projecting horizontally and a thread guide portion 77b projecting obliquely upward. As shown in FIG. 6C, a pin 78 is vertically fixed to the plate support piece 77, and a holding plate 79 is inserted into the outer periphery of the pin 78 so as to be vertically movable. As shown in FIG. 6B, the flat plate 7
9a is provided, and the holding plate 79 is prevented from rotating as the flat portion 79a is locked by the holding member 76.

As shown in FIG. 6C, a washer 80 is fixed to the lower end of the pin 78, and the outer periphery of the pin 78 is located between the washer 80 and the holding plate 79. The presser spring 81 is fitted. This presser spring 81
Is for urging the presser tray 79 upward to press against the plate support piece 77. When the upper thread 48 is wound around the cutter 65 and cut, the upper thread 48 is thread-guided 77a of the plate support piece 77. And 77b, the plate support piece 77 and the holding plate 79
Is inserted and clamped between As shown in FIG. 6C, a projection 79b is provided on the upper surface of the holding plate 79, and the projection 79b inclines the holding plate 79 with respect to the plate support piece 77, and A wedge-shaped thread removal groove 82 is formed between the plate 79 and the dish support piece 77.

The upper end of the threading shaft 75 is provided at the upper end of FIG.
As shown in FIG. 5, a cam pin 83 is fixed, and both ends of the cam pin 83 protrude from the outer peripheral surface of the threading shaft 75 as shown in FIG. As shown in FIG. 4A, an inclined cam groove 71e is formed in the right cylindrical portion 71d of the operating body 71, and the front end of the cam pin 83 is inserted into the cam groove 71e. Have been.

A presser spring 84 is fitted on the outer peripheral portion of the threading shaft 75 at the upper end, and the upper end of the presser spring 84 is applied to the upper wall of the right cylindrical portion 71d. I have.
The lower end of the pressing spring 84 is applied to the cam pin 83, and the pressing spring 84 connects the cam pin 83 to the cam groove 71e.
Is held at the lowest position. Accordingly, when the operating body 71 is lowered, the downward force of the operating body 71 is transmitted from the pressing spring 84 to the cam pin 83, and the threading shaft 75 is lowered while the cam pin 83 is held at the lower end in the cam groove 71e.

The lower end of the threading shaft 75 is provided at the lower end of FIG.
As shown in the lower part of FIG. 5, a substantially U-shaped link lever 85 is rotatably mounted, and a substantially U-shaped thread locking member 86 is fixed to the link lever 85. This thread locking member 86 has an arm portion 86a, and
When the thread locking member 86 descends integrally with the arm 5, the arm 8
6 a comes into contact with the upper thread 48, and the upper thread 48 enters the thread locking member 86. In addition, the lower part of FIG.
6 shows a descending state.

A positioning member 87 is screwed to the needle bar 40 at a position above the needle bar holder 42. Another positioning member 88 is screwed to the upper end of the threading shaft 75. A stopper 87a is provided on the positioning member 87 of the needle bar 40. When the positioning member 88 comes into contact with the stopper 87a when the threading shaft 75 is lowered, the threading shaft 75 stops descending. Thereafter, the cam pin 83 of the threading shaft 75 is pressed against the inner surface of the cam groove 71e of the operating body 71, and the threading shaft 75 rotates in the direction of arrow D in FIG. still,
The rotation range of the threading shaft 75 is 65 ° as shown in FIG.
Is set to

At the lower part of the needle bar base 39, a notch 39c is formed as shown by a two-dot chain line in FIG.
When the threading shaft 75 starts descending in a state where the needle bar 40 is not at the needle upper position, the cam pin 83 enters the notch 39c,
With the engagement with the inner surface of the notch 39c, the rotation of the threading shaft 75 is restricted. Therefore, the threading operation is allowed only when the needle bar 40 is at the needle upper position.

As shown in FIG. 6A, a first pin 89 is vertically fixed to the link lever 85. One end of a first link plate 90 is rotatably connected to the pin 89, and a link pin 91 is mounted on the other end of the link plate 90, and the second link plate is attached to the link pin 91. One end of 92 is rotatably connected. As shown in FIG. 6B, the holding member 76 is provided with a cylindrical boss 76a. A rotary shaft 93 is inserted into the boss portion 76a, and the other end of the second link plate 92 is rotatably connected to the rotary shaft 93.

The lower end of the threading shaft 75 is provided at the lower end of FIG.
As shown in the figure, the lower side 94c of the substantially U-shaped link guide 94 is rotatably inserted, and the threading shaft 75 is positioned on the upper and lower surfaces of the lower side 94c of the link guide 94 and stopped there. A wheel 95 is mounted. These retaining rings 95
Is for positioning the link guide 94 in the axial direction, and when the threading shaft 75 is lowered, the link guide 9
4 descends integrally with the threading shaft 75.

The intermediate portion of the guide member 72 is a link guide 94
During rotation of the threading shaft 75, the link guide 94 is prevented from rotating by the guide member 72, and the threading shaft 75 is independently rotated in the direction of arrow D.
The upper retaining ring 95 is provided with a shaft insertion portion 39d of the needle bar base 39.
, The threading shaft 75 is held at the upper initial position.

As shown in FIG. 6A, a linear cam groove 94a is formed on the lower surface of the lower side 94c of the link guide 94.
Are formed. A link pin 91 is inserted into the cam groove 94a, and when the plate support piece 77 rotates in the direction of arrow D integrally with the threading shaft 75, the link pin 91 moves in the direction of arrow E along the cam groove 94a. Slide to. Then, the first pin 89 moves in the direction of arrow F, and the thread locking member 86 rotates in the direction of arrow G.

As shown in FIG. 6A, a thread hooking groove 86b is formed in the thread locking member 86, and when the thread locking member 86 rotates in the direction of arrow G, ( As shown in b), the upper thread 48 that has entered the thread locking member 86 engages with the thread hooking groove 86b, and approaches the sewing needle 41 as the thread locking member 86 rotates. In this state, the boss portion 76a of the holding member 76 contacts the upper thread 48 between the thread locking member 86 and the presser tray 79, and holds the upper thread 48 in a tensioned state.

A hook mechanism 95 is fixed to the holding member 76 at a position opposite to the dish support piece 77. As shown in FIG. 7, the hook mechanism 95 horizontally extends through the hook plate 96, two guard plates 97 located on both sides of the hook plate 96, and the hook plate 96 and the two guard plates 97. When the threading shaft 75 is lowered, the hook mechanism 95 is located at the rear left of the needle bar 40 when viewed from above, as shown in FIG. And descend together. Further, when the threading shaft 75 stops descending, the hook plate 96 is positioned at the same height as the eye 41a of the sewing needle 41.

The tip of the hook plate 96 is provided at the end of FIG.
As shown in FIG. 5, a hook 96a is formed, and when the threading shaft 75 rotates, the hook 96a is turned into the eye hole 41 of the sewing needle 41.
a, the two guard plates 97 project forward of the sewing needle 41. The positioning members 87 and 8 shown in FIG.
The height of the hook plate 96 is adjusted by loosening the screw at the time of manufacture, and the hook plate 96 is positioned at the same height as the eye hole 41a of the sewing needle 41 as the height of the positioning members 87 and 88 is adjusted. The threading device 66 is configured as described above.

In the ROM 35b of the control device 35, the contour of the threading area S1 of FIG. 1 is stored as coordinate data (X, Y). This threading area S1 is
The rotation area of the thread locking member 86, the hook mechanism 95, etc.
This is equivalent to an operation area projected on the coordinates, and is necessary for the threading device 66 to pass the upper thread 48 through the eye 41a of the sewing needle 41 without being disturbed by the embroidery frame 55 and the embroidery head 54. Indicates a space.

In the ROM 35b of the control device 35, the outline of the maintenance area S2 in FIG.
It is stored as This maintenance area S2 is
An area in which the sewing needle 41 can be replaced with both hands, the thread can be straightened with both hands, and the cloth presser 25 can be replaced with both hands, without being disturbed by the embroidery frame 55 and the embroidery head 54.
It is projected on the coordinates and is set to a size including the threading area S1.

The exposure position is stored as coordinate data (X, Y) in the ROM 35b of the control device 35. This exposure position is a retracted position of the embroidery frame 55 that exposes the needle plate 22, as shown by a solid line in FIG.
In order to prevent interference with the presser foot 25, the presser foot 25 is moved to the exposed position through the space below the presser foot 25 while being held at the raised position.

Next, the threading operation of passing the upper thread 48 through the eye 41a of the sewing needle 41 will be described in detail. When the controller 35 detects the thread change data during the execution of the embroidery operation, the controller 35 outputs the sewing machine motor 4 based on the output signal from the timing sensor 63.
6 is turned off, and the needle bar 40 is stopped at the needle upper position. Then, a thread cutting signal is given to the electromagnetic solenoid 60 of the thread cutting mechanism to cut the upper thread and the lower thread, and then a message is displayed on the LCD 36 to prompt the operator to operate the presser lifting lever 27.

After confirming the message on the LCD 36, the operator operates the presser lifting lever 27 to the raised position,
The thread tension mechanism 30 is switched to the release state. And upper thread 4
8 is pulled out from the upper thread spool, and the thread tension mechanism 30, the thread take-up spring,
After being inserted into the hook 40a via the balance, it is wound around the cutter 65 and cut. Then, the upper thread 48 is sandwiched between the plate supporting piece 77 and the presser tray 79, and the thread locking member 86
Is stretched below.

A spring member (not shown) is provided on a path from the thread spool to the thread tension mechanism 30. This spring member applies a few grams of return pretension to the upper thread 48 so that the twist of the upper thread 48 does not enter the thread tension mechanism 30 and cause sewing failure. The holding pressure by the holding plate 79 and the pretension pressure by the spring member keep the tension state even after cutting.

When a message is displayed on LCD 36, control device 35 detects the state of presser lifting lever 27 based on the output signal from presser lifting sensor 64. here,
When it is detected that the presser lifting lever 27 has been operated to the raised position, it is determined whether or not the embroidery frame 55 has retracted outside the threading area S1.

For example, as shown by a solid line in FIG.
When the inner peripheral surface of the needle 5 is retracted outside the threading area S1, the control device 35 determines whether the needle bar 40 is at the needle-up position based on the output signal from the timing sensor 63. Here, when it is determined that the needle bar 40 is at the needle-up position, the LCD 3
A message is displayed at 6 to urge the operation of the knob 70. If it is determined that the needle bar 40 is not at the needle upper position, the sewing machine motor 46 is driven to move the needle bar 40 to the needle upper position, and then a message is displayed on the LCD 36 to urge the operation of the knob 70.

Further, as shown by a two-dot chain line in FIG. 1, when at least a part of the inner peripheral surface of the embroidery frame 55 has entered the threading area S1, a warning message is displayed on the LCD 36. Then, the X-direction stepping motor 56 and the Y-direction stepping motor 57 are driven to move the embroidery frame 55 to the retreat position (X, Y), and retreat the inner peripheral surface of the embroidery frame 55 out of the threading area S1. The retracted position (X, Y) is calculated by the controller 35. The controller 35 determines that the embroidery frame 55 and the embroidery head 54 are away from the sewing needle 41 and the movement amount of the embroidery frame 55 is the shortest. (X,
Y) is calculated.

When the controller 35 moves the embroidery frame 35 to the retreat position (X, Y), the controller 35 determines whether the needle bar 40 is at the needle position based on the output signal from the timing sensor 63. Here, when it is determined that the needle bar 40 is at the needle position, a message is displayed on the LCD 36 to urge the operation of the knob 70. If it is determined that the needle bar 40 is not at the needle upper position, the sewing machine motor 46 is driven to move the needle bar 40 to the needle upper position, and then a message is displayed on the LCD 36 to urge the operation of the knob 70.

After confirming the message on the LCD 36, the operator operates the knob 70 downward. Then, the moving body 68, the operating body 71, and the threading shaft 75 descend integrally,
When the thread locking member 86 of the threading shaft 75 descends, the upper thread 48 is captured. Thereafter, when the positioning member 88 on the threading shaft 75 contacts the stopper 87a of the positioning member 87 on the needle bar 40, the threading shaft 75 stops descending and rotates in the direction of arrow D in FIG.

When the threading shaft 75 rotates in the direction of arrow D,
As shown in FIG. 7A, the hook portion 96a of the hook plate 96 is formed.
Penetrates into the eye hole 41a of the sewing needle 41. With this,
As shown in FIG. 6B, the thread locking member 86 rotates in the direction of the arrow G, and transfers the upper thread 48 to the hook 96a. 2
Between the guard plates 97, as shown in FIG.
A thread introduction groove 99 is formed. This thread introduction groove 99 is
It has a V-shape when viewed from the arrow H direction.
Is transferred to the hook 96a through the thread introduction groove 99.

Thereafter, when the operator lifts the knob 70, the cam pin 83 is moved to the cam groove 71 as the operating body 71 is raised.
After being pushed by the inner surface of e, the threading shaft 75 is reversed in the direction indicated by the arrow D in FIG. At this time, the hook plate 96
The hook portion 96a of the hook plate 96 is retracted from the eye hole 41a of the sewing needle 41 as shown in FIG. 7B, so that the upper thread 48 is passed through the eye hole 41a of the sewing needle 41. , And between the wire 98 and the hook 96a.

The upper thread 48 is provided with pretension for preventing twisting of the upper thread at the upstream portion of the thread locking member 86, and is provided with the holding pressure of the presser tray 79 at the downstream portion thereof. I have. For this reason, the upper thread 48 is not loosened and
a, and is stably held by the hook 96a.

When the threading shaft 75 is reversed, the link pin 9
1 slides along the cam groove 94a of the link guide 94 in the direction indicated by the arrow E in FIG. 6B, and the thread locking member 86 rotates so as to move away from the sewing needle 41. At this time, the cutting side of the upper thread 48 is pulled out in the thread path direction through the thread removal groove 82 without being pulled out in the outer shape direction of the presser tray 79, and the threading operation ends.

When the threading operation is completed, the operator operates the presser lifting lever 27 to the lower position. Then, the control device 35 detects the operation of the presser lifting lever 27 based on the output signal from the presser lifting sensor 64, and detects the X direction stepping motor 56 and the Y direction stepping motor 57.
Drive. Then, after returning the embroidery frame 55 to the pre-evacuation position, the sewing needle 41 is moved up and down while moving the embroidery frame 55 based on the embroidery data, and the embroidery operation is resumed.

When the presser lifting lever 27 is operated from the lower position to the upper position when the embroidery operation is stopped, the controller 35
Detects the operation of the presser lift lever 27 based on the output signal from the presser lift sensor 64, and
It is determined whether or not the needle bar 40 is at the needle-up position based on the output signal from.

For example, when the needle bar 40 is at the needle-up position, the control device 35 determines whether the embroidery frame 55 is in the threading area S1, and places the embroidery frame 55 in the threading area S1 according to the determination result.
1 After having evacuated outside, a message is displayed on the LCD 36 to urge the operation of the knob 70. When the needle bar 40 is not at the needle upper position, the sewing machine motor 46 is driven to raise the needle bar 40 to the needle upper position, and then a message is displayed on the LCD 36 to urge the operation of the knob 70.

The upper thread 48 runs out during the execution of the embroidery operation,
When a thread break signal is output from the thread break sensor 61, the control device 35 turns off the sewing machine motor 46 based on the output signal from the timing sensor 63, and stops the needle bar 40 at the needle-up position. And the electromagnetic solenoid 6 of the thread cutting mechanism
After giving a thread cutting signal to 0 and cutting the upper and lower threads,
A message is displayed on the LCD 36 to prompt the operator to replace the upper thread spool. Then, after confirming the message on the LCD 36 and replacing the upper thread spool, the operator operates the presser lifting lever 27 to the raised position to switch the thread tension mechanism 30 to the released state.

When a message is displayed on LCD 36, control device 35 detects the state of presser lifting lever 27 based on an output signal from presser lifting sensor 64. here,
When it is determined that the presser lifting lever 27 has been operated to the raised position, it is detected whether the embroidery frame 55 has retracted outside the maintenance area S2.

For example, as shown by a solid line in FIG.
When the inner peripheral surface of the needle 5 is retracted outside the maintenance area S2, the control device 35 determines whether the needle bar 40 is at the needle upper position based on the output signal from the timing sensor 63. Here, when it is determined that the needle bar 40 is at the needle upper position,
A message is displayed on the LCD 36 to urge the upper thread hooking operation and the operation of the knob 70. If it is determined that the needle bar 40 is not at the needle upper position, the sewing machine motor 46 is driven to move the needle bar 40 to the needle upper position, a message is displayed on the LCD 36, and the upper thread hooking operation and the operation of the knob 70 are performed. Prompt for operation.

Also, as shown by the two-dot chain line in FIG. 1, when at least a part of the inner peripheral surface of the embroidery frame 55 has entered the maintenance area S2, a warning message is displayed on the LCD 36. Then, the X-direction stepping motor 56 and the Y-direction stepping motor 57 are driven to move the embroidery frame 55 to the retreat position (X, Y), and retreat the inner peripheral surface of the embroidery frame 55 out of the maintenance area S2. This retreat position (X,
Y) is calculated by the control device 35, and the control device 3
The step 5 calculates the retreat position (X, Y) at which the embroidery frame 55 and the embroidery head 54 move away from the sewing needle 41 and the movement amount of the embroidery frame 55 is the shortest.

When the controller 35 moves the embroidery frame 35 to the retracted position (X, Y), the controller 35 determines whether the needle bar 40 is at the needle position based on the output signal from the timing sensor 63. Here, when it is determined that the needle bar 40 is at the needle upper position, a message is displayed on the LCD 36, and the upper thread hooking operation,
The operation of the knob 70 is prompted. When it is determined that the needle bar 40 is not at the needle upper position, the sewing machine motor 46 is driven to
Is moved to the needle upper position, a message is displayed on the LCD 36, and the upper thread hooking operation and the operation of the knob 70 are prompted.

When the operator confirms the message on the LCD 36, the operator pulls out the upper thread 48 from the new upper thread spool,
Hook 4 via thread tension mechanism 30, thread take-up spring, balance
0a, and is pressed against the cutter 65b of the thread cutter 65 to cut. Then, after the upper thread 48 is passed through the sewing needle 41 by operating the knob 70, the presser lifting lever 27 is returned to the lowered position. Then, the control device 35 detects the operation of the presser lifting lever 27 based on the output signal from the presser lifting sensor 64, and returns the embroidery frame 55 to the pre-evacuation position.
Restart the embroidery operation.

When the bobbin thread runs out during the execution of the embroidery operation, the control device 35 detects the breakage of the bobbin thread based on the output signal from the bobbin thread amount sensor 62. And the timing sensor 6
The sewing machine motor 46 is turned off based on the output signal from the sewing machine 3, and the needle bar 40 is stopped at the needle-up position. Thereafter, a thread cutting signal is given to the electromagnetic solenoid 60 of the thread cutting mechanism to cut the upper thread and the lower thread, and then a message is displayed on the LCD 36 to urge the operation of the presser lifting lever 27 to the raised position.

When the operator confirms the message on the LCD 36, he operates the presser foot lifting lever 27 to operate the presser foot 25.
To the ascending position. Then, the control device 35 detects that the presser lifting lever 27 has been operated to the raised position based on the output signal from the presser lifting sensor 64, and drives the X direction stepping motor 56 and the Y direction stepping motor 57. Then, the embroidery frame 55 is moved to the exposed position in FIG. 2 through the space below the presser foot 25.

When the controller 35 moves the embroidery frame 55 to the exposure position, a message is displayed on the LCD 36 to prompt the operator to replace the bobbin thread and operate the start / stop switch 23. Then, the operator confirms the message on the LCD 36, shifts the needle plate 22, replaces the bobbin with a new one, returns the needle plate 22 to the original position, and operates the start / stop switch 23.

The control device 35 includes the start / stop switch 23
Is detected, it is detected whether or not the presser lifting lever 27 is at the raised position based on the output signal from the presser lifting sensor 64. Here, when it is confirmed that the presser lifting lever 27 is in the raised position, the X-direction stepping motor 56 and the Y-direction stepping motor 57 are driven to drive the embroidery frame 5.
5 is returned to the pre-evacuation position.

When the presser lifting lever 27 is not at the raised position, the controller 35 displays a warning message on the LCD 36 to urge the operator to operate the lifting lever 27 to the raised position. Then, when it is confirmed that the presser lifting lever 27 is at the raised position, the embroidery frame 55 is returned to the pre-evacuation position.

When the control device 35 returns the embroidery frame 55 to the pre-evacuation position, a message is displayed on the LCD 36 and the operation of the presser lifting lever 27 to the lowering position is urged. And
When the operation of the presser lifting lever 27 to the lowering position is detected based on the output signal from the presser lifting sensor 64, the embroidery operation is restarted.

According to the above embodiment, the embroidery frame 5
When 5 was within the threading area S1, the embroidery frame 55 was automatically moved to the retracted position outside the threading area S1. For this reason, the threading device 66 does not interfere with the embroidery frame 55, so that the threading operation is smoothly performed without being affected by the embroidery frame 55.

In addition, maintenance operations such as replacement of the sewing needle 41, removal of thread stitches, and replacement of the presser foot 25 are performed by the needle bar 40.
To perform with both hands in the vicinity, the embroidery frame 55 is in the way,
The embroidery frame 55 needs to be attached / detached or moved. These maintenance operations are burdensome for the operator and affect the finished state of the embroidery pattern. On the other hand, according to the above embodiment, the embroidery frame 55 is automatically moved out of the maintenance area S2. Therefore, the maintenance work can be performed with both hands without being disturbed by the embroidery frame 55, so that the maintenance workability is improved.

In addition, the consumption of the upper thread 48 and the lower thread cannot be predicted accurately, and particularly, the occurrence of breakage of the upper thread cannot be predicted at all.
In addition, when the thread breaks, problems such as thread breakage and needle breakage are likely to occur at the same time. Therefore, it is preferable to secure the wide work space by removing the embroidery frame 55 or retreating it over a long distance. On the other hand, according to the above embodiment, when the upper thread break is detected based on the output signal from the thread break sensor 61, the embroidery frame 55 is automatically retracted outside the maintenance area S2. For this reason, it becomes easy to cope with inconveniences such as thread entanglement and needle breakage that occur concurrently with yarn breakage, so that maintenance workability is further improved.

When the embroidery frame 55 is retracted,
It is preferable that the embroidery frame 55 be moved to a position as far as possible from the needle bar 40 to facilitate the work. However, if the evacuation distance of the embroidery frame 55 is increased, the evacuation takes a long time, resulting in a loss of work time. On the other hand, according to the above embodiment, the retreat position is set so that the moving distance of the embroidery frame 55 is the shortest. For this reason, the time required for retracting the embroidery frame 55 is reduced, and the work efficiency is improved.

When the operator manually returns the embroidery frame 55 to the pre-evacuation position, it is difficult to reproduce the embroidery operation resume position, and a gap is easily formed between the needle drop position before the evacuation and the resume position. Become. On the other hand, according to the above-described embodiment, when performing the sewing operation after the embroidery frame 55 is retracted, the embroidery frame 55 is automatically returned to the pre-evacuation position. For this reason, the embroidery operation is restarted by returning to the needle drop position where the thread change or thread break has occurred, and the finished state of the embroidery pattern is improved.

Various triggers are conceivable for detecting that the embroidery frame 55 is in the threading area S1 or the maintenance area S2 and retracting the embroidery frame 55.
However, when an appropriate trigger is not selected, the embroidery frame 55 is retracted, although the operator does not intend to perform maintenance. On the other hand, according to the above embodiment, at the time of threading, the presser lifting lever 27 is operated to the raised position to release the thread tension mechanism 30 on the upper thread path,
Paying attention to prohibiting the drive of the sewing machine motor 46, the embroidery frame 55 is retracted by operating the presser lifting lever 27 to the raised position as a trigger. For this reason, the embroidery frame 55 is retracted at an appropriate timing at which the operator desires maintenance, so that usability is improved.

When the lower thread breakage is detected based on the output signal from the lower thread amount sensor 62, the embroidery frame 55 is moved to the exposure position to expose the needle plate 22. For this reason, the work of replacing the lower thread bobbin by shifting the needle plate 22 can be performed smoothly without being disturbed by the embroidery frame 55, and the workability of attaching and detaching the lower thread bobbin is improved.

In the first embodiment, the embroidery frame 5
As conditions for retracting 5 out of the maintenance area S2,
Although the thread break signal from the thread break sensor 61 has been exemplified, the present invention is not limited to this. For example, the thread break signal is output when the thread cut key 37a is operated. The detection of the thread change data may be set as a condition, or the detection of a thread cut signal automatically output with the detection of the thread change data may be set as a condition.

In the first embodiment, a plurality of types of threading areas S1 and maintenance areas S2 are stored in the ROM 35b of the control device 35, and the plurality of types of threading areas S1 and maintenance areas S2 are stored in the embroidery frame. The selection may be made according to the shape, size, thickness, etc. of the 55. In this case, when the selection key is mounted on the head portion 21d or the selection key is printed on the operation panel 37 and the type of the embroidery frame 55 is input based on the operation of the selection key, the control device 35 operates the selection key. Preferably, the threading area S1 and the maintenance area S2 are automatically selected according to the contents.

In the first embodiment, the threading area S1 is held down by the presser plate 79, the thread locking member 86, and the hook mechanism 9.
Although the rotation area is set to be equal to 5 or the like, the invention is not limited to this. For example, the rotation area may be set to be slightly larger than the rotation area of the holding plate 79 or the like.

Next, a second embodiment of the present invention will be described. The description of the same parts as in the first embodiment will be omitted, and only different parts will be described below. A plurality of retracted positions of the embroidery frame 55 are stored as coordinate data (X, Y) in the ROM 35b of the control device 35, and the presser lifting lever is used when executing a threading operation, a bobbin thread exchanging operation, and an upper thread piece exchanging operation. When the controller 27 is operated to the raised position, the control device 35 detects the operation of the presser lifting lever 27, selectively moves the embroidery frame 55 to a predetermined retreat position, and moves the embroidery frame 55 away from the sewing needle 41. Thereafter, when it is detected that the presser lifting lever 27 has been operated to the lowered position, the embroidery frame 55 is returned to the pre-evacuation position.

According to the above means, the embroidery frame 55 is moved to the predetermined retreat position in accordance with the operation of the presser lifting lever 27, and the space near the sewing needle 41 is enlarged. For this reason, it becomes easy to perform maintenance work near the sewing needle 41 without separately performing an operation for moving the embroidery frame 55.

In the first and second embodiments, the operation of raising the presser lever 27 to the raised position is exemplified as the trigger for retracting the embroidery frame 55. However, the present invention is not limited to this. Triggering a thread trimming signal associated with the operation of the thread trimming key 37a, triggering detection of thread change data embedded in embroidery data, or triggering a thread trimming signal automatically output upon detection of thread change data. Alternatively, the embroidery frame 55 may be retracted by turning off the sewing machine motor 46 as a trigger. In this case, the embroidery frame 55 is automatically retracted at the time of thread trimming, thread changing, and all maintenance performed in the operation stop state, so that usability is improved.

In the first and second embodiments, the embroidery frame is triggered by the fact that the upper thread spool has been attached to the sewing machine frame 21 or that the upper thread spool has been removed from the sewing machine frame 21 as a trigger. 55 may be evacuated. In this case, it is preferable to mount a thread spool sensor composed of a micro switch or the like on the sewing machine frame 21 and detect the installation state of the upper thread spool based on an output signal from the thread spool sensor. Since the embroidery frame 55 is automatically retracted at the time of attachment and detachment, usability is improved.

In the first and second embodiments, the embroidery frame 55 may be retracted by operating the knee lever as a trigger. In this case, it is preferable to dispose a micro switch or the like in the head portion 21d and detect the operation of the knee lever in conjunction with switching the state of the micro switch based on the lifting of the presser bar 24 or the rotation of the lifter.

In the first and second embodiments, the embroidery frame 55 is returned to the pre-evacuation position based on the operation of the presser lifting lever 27 to the lowering position. However, the present invention is not limited to this. For example, the embroidery frame 55 may be returned to the pre-evacuation position based on the operation of the start / stop switch 23. Alternatively, a dedicated key for returning the embroidery frame 55 to the pre-evacuation position may be printed on the operation panel 37 or attached to the head section 21d.

Next, a third embodiment of the present invention will be described with reference to FIG. The description of the same parts as in the second embodiment will be omitted, and only different parts will be described below. A threading motor 100 including a stepping motor is provided in the head portion 21d.
A pinion gear 101 is fixed to the rotation shaft 00. The moving table 68 is provided with a rack 102, and the pinion gear 101 is meshed with the rack 102.

[0125] On the operation panel 37, a threading key (not shown) corresponding to operation means is printed.
5 detects the operation of the threading key, selectively moves the embroidery frame 55 to a predetermined retreat position, and moves the embroidery frame 55 away from the sewing needle 55. At the same time, the drive of the threading motor 100 is controlled,
The threading operation is performed by moving the movable table 68 up and down.

According to the above embodiment, the embroidery frame 55 is selectively moved to the predetermined retracted position by the operation of the threading key as a trigger. For this reason, the space near the sewing needle 41 is enlarged when the threading key for performing the automatic threading is operated, so that the threading device 66 interferes with the embroidery frame 55 and hinders the automatic threading operation. Is prevented.

Although the threading key is printed on the operation panel 37 in the third embodiment, the invention is not limited to this. For example, a threading key may be mounted on the head 21d.

In the second and third embodiments, the embroidery frame 55 is selectively moved to the predetermined retreat position. However, the present invention is not limited to this.
Alternatively, the space in the vicinity of the sewing needle 41 may be selectively moved in a predetermined evacuation direction away from 1 to enlarge the space.

In the second and third embodiments, it is determined whether the embroidery frame 55 is in the threading area S1 or the maintenance area S2, and the embroidery frame 55 is located in the threading area S1 or the maintenance area S2. The embroidery frame 55 may be retracted only when it is within the area S2. In this case, the threading area S1 does not need to be equal to the rotation area of the presser tray 79 or the like, and may be set slightly larger than the rotation area of the presser tray 79 or the like.

In the first to third embodiments, the thread trimming mechanism is automatically operated when the embroidery frame 55 is retracted. However, the present invention is not limited to this. It is good also as composition which does not operate automatically. In particular, in the case of the first embodiment, since the retreat position is set so that the moving distance of the embroidery frame 55 is the shortest, the amount of drawing out the lower thread can be minimized. For this reason, when the embroidery operation is restarted, the lower thread does not remain and the sewing state is not impaired, so that
There is no need to operate the thread cutting key 37a to perform a troublesome operation of cutting the lower thread.

In the first to third embodiments, the start / stop switch 23 is operated to return the embroidery frame 55 from the exposure position to the pre-evacuation position. However, the present invention is not limited to this. No, for example, embroidery frame 5
A configuration may be adopted in which a dedicated key for returning the position 5 from the exposure position to the pre-evacuation position is printed on the operation panel 37 or attached to the head section 21d.

In the first to third embodiments, the exposure position of the embroidery frame 55 is set at the rear of the needle plate 22. However, the present invention is not limited to this. May be set to the right or right.

In the first and second embodiments, a one-hand operation type threading device 66 in which the threading is executed only by operating the knob 70 is illustrated. In the third embodiment, the threading device is used. Although the automatic threading device 66 in which the threading is executed only by operating the threading key is illustrated, the invention is not limited to this. For example, while the upper thread is tensioned with one hand, the picking operation is performed with the other hand. The present invention may be applied to the threading device shown in FIG.

In the first to third embodiments, the embroidery frame 55 and the embroidery head 54 are moved in the directions of the arrows X and Y. However, the present invention is not limited to this. 41 is an arrow X and an arrow Y
It may be configured to move in the direction.

In the first to third embodiments, the embroidery frame 55 is retracted regardless of the type of the embroidery frame 55. However, the present invention is not limited to this. The embroidery frame 55 may be retracted only when the embroidery frame 55 is mounted. In this case, a dedicated key may be printed on the operation panel 37, or a dedicated key may be attached to the head portion 21d, and the use of the specific embroidery frame 55 may be notified to the control device 35 based on the operation of the dedicated key.

[0136]

As is apparent from the above description, the sewing machine of the present invention has the following effects. According to the first aspect, at least a part of the moving means is relatively moved in accordance with the operation of the operating means, and the space near the sewing needle is enlarged. For this reason, it becomes easy to perform maintenance work near the sewing needle without separately performing an operation for moving the moving means. According to the second aspect of the present invention, at least the moving means is provided at the time of the presser lifting operation, the threading operation, the lower thread replacing operation, the upper thread spool replacing operation, the presser lifting operation, the thread cutting operation, the automatic threading operation, and the stopping operation. Since the part is relatively moved and the space near the sewing needle is enlarged, the above-described maintenance work can be easily performed.

According to the third aspect of the present invention, when the moving means is in the threading area, at least a part of the moving means is moved to enlarge the space near the sewing needle. The threading operation is reliably performed without being disturbed by the moving means. According to the fourth aspect of the present invention, the embroidery frame is automatically retracted outside the threading area during threading, so that the threading operation can be performed smoothly without being disturbed by the embroidery frame. According to the fifth aspect of the present invention, the embroidery frame is selectively retracted out of the maintenance area, so that maintenance work such as needle replacement can be performed smoothly without being disturbed by the embroidery frame.

According to the sixth aspect, when the supply of the upper thread to the sewing needle is stopped, the embroidery frame is retracted out of the maintenance area. For this reason, it becomes easy to cope with needle breakage and the like that occur simultaneously with thread breakage, and maintenance workability is enhanced. According to the seventh aspect, since the retreat position is set so that the moving distance of the embroidery frame is shortest, the time required for retreating the embroidery frame is reduced, and the work efficiency is improved. In addition, since the amount of drawing out the bobbin thread can be minimized, it is possible to prevent the finished state of the embroidery pattern from being adversely affected.

According to the means of claim 8, the embroidery frame is automatically returned to the pre-evacuation position. For this reason, the embroidery operation is restarted by returning to the needle drop point where the thread change or thread break has occurred, so that the finished state of the embroidery pattern is improved. According to the ninth aspect of the present invention, the embroidery frame is automatically retracted when the operator operates the presser lifting lever for executing threading, so that usability is improved. According to the tenth aspect, the embroidery frame is automatically retracted at the time of thread trimming for executing threading, so that usability is improved.

According to the eleventh aspect, the operator automatically retracts the embroidery frame at the time of thread change for executing threading, so that usability is improved. According to the twelfth aspect, the embroidery frame is automatically retracted when the operator mounts or removes the upper thread spool for performing threading, so that usability is improved. According to the thirteenth aspect, when the bobbin thread runs out, the embroidery frame is moved to the exposure position and the needle plate is exposed, so that the operation of shifting the needle plate and replacing the bobbin bobbin obstructs the embroidery frame. It is done smoothly without being done.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention (a perspective view showing a state in which an embroidery frame is retracted outside a threading area).

FIG. 2 is a perspective view showing a state in which the embroidery frame is retracted to an exposure position.

FIG. 3 is a perspective view showing a threading device, a needle bar driving device, and the like.

4A is a front view illustrating a threading device, a needle bar driving device, and the like, and FIG. 4B is a diagram illustrating a link guide, a guide member, and a threading shaft.

FIG. 5 is a view showing a positioning member, a cam pin, and the like along a line X1-X1 in FIG.

FIG. 6A is a top view illustrating a main part of the threading device when the threading shaft is not rotated, and FIG. 6B is a top view illustrating a main part of the threading device when the threading shaft is rotated. (C) is a cross-sectional view along the line X1-X1, and (d) is a view as viewed from X2.

7A is a perspective view showing a state in which the hook plate has entered the eye of the sewing needle, FIG. 7B is a perspective view showing a state in which the hook plate has retracted from the eye of the sewing needle, and FIG. ) Shows a state in which the hook plate is retracted from the eye hole of the sewing needle and rises.

FIG. 8 is a front view showing the internal configuration of the head unit.

FIG. 9 is a front view showing the cloth presser.

10A is a perspective view showing a cutter, and FIG. 10B is a perspective view showing a state in which an upper thread is cut.

FIG. 11 is a front view showing the entire configuration.

FIG. 12 is a top view showing the embroidery device;

FIG. 13 is a front view showing an operation panel.

FIG. 14 is a block diagram schematically showing an electrical configuration.

FIG. 15 is a view corresponding to FIG. 4, showing a third embodiment of the present invention.

FIG. 16 shows a conventional example.

FIG. 17 is a perspective view showing a state where an upper thread is hooked on a hook;

18A is a perspective view showing a state immediately before the hook enters the eye of the sewing needle, FIG. 18B is a perspective view showing a state where the hook enters the eye of the sewing needle, and FIG. ) Is a perspective view showing a state where the hook is retracted from the eye hole of the sewing needle.

19A is a side view showing another conventional example, and FIG. 19B is a front view.

[Explanation of symbols]

S1 is a threading area, S2 is a maintenance area, 22 is a needle plate, 23 is a start / stop switch (operation means), 25 is a work clamp, 27 is a presser lifting lever (operation means), and 35 is a control device (control means, Detecting means), 37a is a thread cutting key (operating means), 41 is a sewing needle, 41a is an eye hole, 48 is an upper thread,
52 is an embroidery device (moving means), 55 is an embroidery frame, 61 is a thread break sensor (upper thread sensor), 62 is a lower thread amount sensor (lower thread sensor), 64 is a presser lifting sensor, and 66 is a threading device. Is shown.

Claims (13)

[Claims] A moving means for moving a sewing object relative to a sewing needle; an operating means for performing an operation relating to sewing; a detecting means for detecting an operation of the operating means; And a control means for relatively moving at least a part of the moving means to a predetermined retreat direction or a predetermined retreat position based on detection of the operation of the sewing machine. 2. The operating means includes a presser lifting operation, a threading operation, a lower thread replacing operation, an upper thread spool replacing operation, a presser lifting operation,
2. The sewing machine according to claim 1, wherein the sewing machine executes at least one of a thread cutting operation, an automatic threading operation, and a stop operation. The control means determines whether or not the moving means is in a threading area related to the threading device, and when it detects that at least a part of the moving means is in the threading area,
2. The sewing machine according to claim 1, wherein at least a part of the moving means is relatively moved to a predetermined evacuation direction or a predetermined evacuation position. 4. An embroidery frame for holding an object to be sewn, control means for forming an embroidery pattern on the object to be sewn based on movement control of the embroidery frame, and a thread for passing an upper thread through an eye hole of a sewing needle. A threading device, wherein the control means moves the embroidery frame to a retracted position outside the threading region when detecting that the embroidery frame is in a threading region related to the threading device during threading. A sewing machine characterized by the following. 5. The sewing machine according to claim 4, wherein the control means selectively moves the embroidery frame to a retracted position outside the threading area and a retracted position outside the maintenance area. 6. An upper thread sensor for detecting a supply state of the upper thread to the sewing needle, wherein the control means detects an upper thread break based on an output signal from the upper thread sensor, and the embroidery frame. 6. The sewing machine according to claim 5, wherein it is determined that the embroidery frame is within the threading area and the embroidery frame is moved to a retreat position outside the maintenance area. 7. The retreating position where the moving distance of the embroidery frame is the shortest, wherein the control means sets the retreat position.
The sewing machine according to any one of 3, 4, and 5. 8. The sewing machine according to claim 1, wherein the control means returns the embroidery frame to a pre-evacuation position when performing an embroidery operation after the embroidery frame has been retracted. 9. A presser lifting lever for separating a work clamp from a work cloth, and a presser lifting sensor for detecting a state of the presser lifting lever, wherein the control means controls the presser based on an output signal from the presser lifting sensor. 5. The sewing machine according to claim 4, further comprising determining whether the embroidery frame is in the threading area in accordance with the detection of the operation of the lever. 10. A thread cutting mechanism for cutting an upper thread, wherein the control means determines whether or not the embroidery frame is in the threading area, by detecting an operation signal for operating the thread cutting mechanism. The sewing machine according to claim 4, characterized in that: 11. The sewing machine according to claim 4, wherein the control means determines whether or not the embroidery frame is within the threading area in accordance with detecting thread change data in the embroidery data. 12. A thread sensor for detecting an attached state of an upper thread spool, wherein the control means detects the attachment or removal of the upper thread spool based on an output signal from the thread spool sensor, and causes the embroidery frame to be attached to the thread. The sewing machine according to claim 4, wherein it is determined whether or not the sewing machine is within the threading area. 13. A bobbin thread sensor for detecting a winding state of a bobbin thread on a bobbin, wherein the control means detects a breakage of the bobbin thread based on an output signal from the bobbin thread sensor. The embroidery frame is moved to an exposure position where the embroidery is exposed.
The sewing machine according to any one of 3, 4, and 5.