TWI605166B - Sewing machine - Google Patents

Description

Sewing machine Field of invention

The present invention relates to a sewing machine suitable for threading work after occurrence of disconnection.

Background of the invention

In the conventional sewing machine, it is known that the number of sewing stitches is set in advance, and the sewing is automatically performed after the sewing of the number of stitches is set, and the sewing is terminated (see, for example, Patent Document 1).

However, generally, in the sewing machine, if the upper thread is unintentionally pulled during the sewing process, the thread tension may occur, and the upper thread may be pulled back by the supply direction and the upper thread may be separated by the needle hole of the needle. If sewing is resumed from the seam where the thread breaks, the upper thread must be reinserted into the needle hole of the needle again.

Therefore, in the conventional sewing machine described above, when the disconnection occurs, the pedal is operated and the tangential operation is performed.

Since the upper thread has been cut off, the tangential action itself is not required, but when the tangential action is performed, the upper shaft is stopped at the upper stop position (the upper shaft angle is about 50°), so that the needle can be stopped at a position higher than the needle plate. . Therefore, if the upper thread is detached from the needle hole of the needle due to the disconnection, the threading operation of the upper thread can be performed, and the sewing can be resumed relatively quickly.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 11-333177

Summary of invention

However, the conventional sewing machine stops the upper shaft at the upper stop position when the thread is cut, and the upper stop position is set at the upper shaft angle of 50° (when the top dead center of the needle bar is set to 0°). Therefore, the needle is formed at a position on the way to the lower end by the top dead center (0°) of the needle bar at the highest position. Therefore, the pinhole of the needle is formed at a slightly lower position, and the work area is narrowed, which causes a problem that the workability of threading is not good.

At this time, in order to improve the workability, the pulley provided on the upper shaft of the sewing machine may be manually operated to rotate the upper shaft to return the needle bar to the top dead center position, but the rotation operation becomes complicated and complicated. Prevents rapid recovery from sewing.

Further, in recent years, the sewing machine has a hand-guide member provided with a fence shape so that the finger of the worker does not enter the region on the lower side of the needle, and in the case as described above, the area on the lower side of the needle becomes It is narrower, so the deterioration of the workability of the threading operation becomes more apparent.

In addition, when a disconnection occurs, the main power supply is turned off, and then the threading or the like is resumed, so that the sewing machine motor is not operated by mistake. In the case shown above, it is also difficult to secure the working area on the lower side of the pinhole of the needle, and it is necessary to perform the rotation operation of the pulley, which is not fast. The problem of speed recovery operations.

In the above-described conventional example, the sewing machine that performs sewing according to the set number of stitches is exemplified. However, the same problem occurs even if the sewing machine is manually operated by operating the pedal.

In other words, in the case of a manually operated sewing machine, sewing is generally performed by maintaining the front step state of the operating pedal, and when returning to the neutral position, the upper shaft is at the lower stop position (the needle is kept stuck in the cloth) Stop, if the rear step is performed, the upper axis moves to the upper stop position and stops to perform the tangent.

Therefore, in the case of the manually operated sewing machine as described above, when the disconnection occurs, the operation pedal must be stepped on to perform the tangent, and after the upper shaft is stopped at the upper stop position, the needle hole of the needle passes through the upper thread. And start sewing again. Therefore, in the same manner as the sewing machine that performs the sewing according to the set number of stitches described above, the problem that the threading work area is narrowed is generated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sewing machine which can widen a threading work area after ensuring that a thread is broken.

The present invention relates to a sewing machine comprising: a needle up-and-down moving mechanism, wherein a sewing machine motor moves up and down a needle bar for holding a needle through an upper shaft; a thread cutting device performs cutting of an upper thread; and a memory unit that memorizes a process of sewing The number of stitches is determined; the stitch number detecting unit detects the number of stitches from the sewing; the operating portion is configured to perform human input by the tangent device; and the control unit performs the thread cutting device and the sewing machine motor In the operation control, the sewing machine is characterized in that the control unit performs sewing in a process that is detected by the needle number detecting unit. When the number of stitches is equal to the predetermined number of stitches, when the execution of the tangent is performed by the operation unit, the operation of stopping the sewing machine motor at the top dead center position of the needle bar is controlled.

In the above configuration, when the number of detected stitches obtained by the stitch number detecting unit is input and the thread is input, the sewing machine is stopped at the top dead center position of the needle bar. Composition.

When the upper thread is cut during sewing, the tangent is executed in a state where the predetermined number of stitches is not reached. Therefore, the control unit detects the occurrence of an accidental cut of the upper thread by the input of the execution of the tangent, and causes the sewing machine motor to be The top dead center position of the needle bar stops. Thereby, when the upper thread is inserted into the needle hole of the needle after the disconnection, the lower region can be widened and the workability can be improved. In addition, since the pulley operation is not required, the complicated release and recovery operations can be accelerated.

In addition to the above-described configuration, the present invention may be configured to include a release input unit that is configured to release a stop state of the sewing machine motor that is stopped at a top dead center position of the needle bar, and the control unit is configured as described above. When the input unit is released from the input of the cancellation, the sewing machine motor is controlled to be disabled.

According to this configuration, even when an input such as the start of sewing is erroneously performed during the recovery operation of the disconnection, the operation of the sewing machine motor can be prohibited.

Further, according to another aspect of the invention, the sewing machine includes a needle up-and-down moving mechanism, and the sewing machine motor moves the needle bar up and down by the upper shaft to hold the needle; the thread cutting device performs the upper thread cutting. The number of stitches in the memory part, the memory stitching process, the number of stitches in the stitching detection unit, the number of stitches detected by the stitching, and the operation part for artificially inputting the tangent of the thread cutting device; And performing the operation control of the thread cutting device and the sewing machine motor; the power supply circuit supplies power to the sewing machine motor by an external power source; and the power switch supplies the power supply of the sewing machine motor by an external power source by the power supply circuit The sewing machine is characterized in that the power supply circuit includes a power storage unit, and the control unit performs the number of stitches that are detected by the stitch number detecting unit and is determined by the sewing. When the number of stitches is matched, when the power is turned off by the power switch, the operation of stopping the sewing machine motor is controlled at the top dead center position of the needle bar.

In the above configuration, when the number of detection stitches obtained by the stitch number detecting unit is turned off before the predetermined number of stitches is reached, the operation control for stopping the sewing machine motor at the top dead center position of the needle bar is performed.

When the upper thread is cut during sewing, the power supply is cut off in a state where the predetermined number of stitches is not reached. Therefore, the control unit detects the occurrence of an accidental disconnection of the upper thread by the cutting of the power switch. The sewing machine motor is stopped at the top dead center position of the needle bar. Thereby, when the upper thread is inserted into the needle hole of the needle after the disconnection, the lower region can be widened and the workability can be improved. In addition, since the pulley operation is not required, the complicated release and recovery operations can be accelerated.

Further, in addition to the above configuration, the present invention may be configured such that the control unit performs the pairing by the stitch number detecting unit. The number of stitches from the start of sewing is counted in each step, and when the number of counted stitches reaches the predetermined number of stitches, the operation control of the tangent is automatically performed.

When the configuration is as described above, the burden on the worker can be reduced by automation, and the uniformity of the sewing product can be achieved.

In addition to the above configuration, the present invention may be configured to include a needle number recording unit that records the execution from sewing to tangent by the stitch number detecting unit at the time of sewing in each step. The number of stitches; and the predetermined number of stitches determining unit determine the predetermined number of stitches by the number of recording stitches recorded one or more times by the stitch number recording unit.

According to this configuration, the work load for setting the predetermined number of stitches can be reduced, and the configuration for setting is not required.

In addition, it is assumed that the sewing machine having the function of setting the predetermined number of stitches can improve the workability of the threading work at the time of disconnection.

As described above, according to the present invention, when the number of stitches when the thread is input or the input power source is turned off does not reach the predetermined number of stitches, the sewing machine motor is stopped at the top dead center position of the needle bar, so that the upper thread is broken. When the pinhole of the needle after the thread is inserted, the lower side region of the needle can be more widened to improve the workability, and the operation of the pulley can be eliminated to achieve the complication of the work and the rapid recovery operation.

2‧‧‧Sewing machine frame

2a‧‧‧Sewing machine arm

2b‧‧‧Sewing machine department

2c‧‧‧Literary Department

5‧‧‧Sewing machine motor

5a, 18a, 20a, 21a‧‧‧ drive circuits

10‧‧‧Sewing machine

11‧‧‧ needle

12‧‧‧ Needle bar

13‧‧‧ needle board

13a‧‧‧ pinhole

14‧‧‧Line elastic adjuster

15‧‧‧Rotating pulley

16‧‧‧ Finger guards

17‧‧‧ Pressing feet

18‧‧‧Foot-leg rise solenoid

19‧‧‧ Brush

20‧‧‧Dial solenoid

21‧‧‧ Tangential solenoid

22‧‧‧Upper axis

31‧‧‧Needle position detector (number of needle detection)

32‧‧‧ Angle Sensor (Needle Detection Unit)

33‧‧‧Operator panel

34‧‧‧Operation pedal (operation department)

35‧‧‧ pedal sensor

36‧‧ Record Media (Memory Department)

37‧‧‧Read/write device

38‧‧‧Resume button (release input)

50‧‧‧Power circuit

51‧‧‧Power Switch Detection

52‧‧‧Electrostatic capacitors (storage unit)

53‧‧‧Power switch

100‧‧‧Control unit (number of stitches, predetermined number of stitches)

101‧‧‧CPU

102‧‧‧Working memory

103‧‧‧Data Memory (memory)

104‧‧‧ counter

S1-S27, S41-S53‧‧‧ steps

S71-S85, S101-S115‧‧‧ steps

Fig. 1 is a perspective view showing the overall configuration of a flat sewing machine according to the present embodiment.

Figure 2 is a block diagram showing the control system of the sewing machine.

Fig. 3 is an explanatory view showing a sewing pattern composed of a plurality of steps.

Fig. 4 is a flow chart showing basic sewing operation control.

Figure 5 is a flow chart displayed for the first stop control.

Figure 6 is a flow chart shown for the second stop control.

Fig. 7 is a flow chart shown for the stop control in manual sewing.

Form for implementing the invention

[sewing machine summary]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1 is a perspective view showing the overall configuration of the sewing machine 10 of the embodiment. In the following description, a direction parallel to the longitudinal direction of the sewing machine arm portion 2a to be described later is referred to as a Y-axis direction (front-rear direction), and a direction orthogonal to the Y-axis direction is referred to as an X-axis. In the direction, the vertical up and down direction is set to the Z axis direction (up and down direction).

As shown in Fig. 1, the sewing machine 10 is a so-called flat sewing machine, and mainly includes a sewing machine housing 2 that supports the entire configuration, and a needle vertical movement mechanism (not shown) that moves the needle bar 12 that holds the needle 11 up and down; The cutting device (not shown) that has been cut, and the control unit 100 that controls the operation of each part of the sewing machine such as the sewing machine motor 5 and the thread cutting device.

Here, reference numeral 14 in Fig. 1 is a line tension adjuster that imparts a thread tension to the upper thread. Further, of course, the thread take-up mechanism, the hook mechanism, the feed mechanism, and the like which are generally mounted on the flat sewing machine are provided. However, since these are the same as those of the well-known structure, the description is omitted.

[Sewing machine frame]

The sewing machine frame 2 is in a front view and has a rough outline. Word shape. The sewing machine housing 2 includes a sewing machine arm portion 2a that forms an upper portion of the sewing machine housing 2 and extends in the front-rear direction, a sewing machine base portion 2b that forms a lower portion of the sewing machine housing 2 and extends in the front-rear direction, and a sewing machine arm portion. 2a The vertical portion 2c connected to the sewing machine table portion 2b.

[Needle up and down moving mechanism]

A needle vertical movement mechanism is built in the sewing machine arm portion 2a. The needle up-and-down moving mechanism includes a sewing machine motor 5 (see FIG. 2) serving as a drive source, an upper shaft 22 that is rotationally driven by the sewing machine motor 5, a needle 11 held at the lower end portion, and is supported by the sewing machine so as to be movable up and down. The needle bar 12 of the arm portion 2a; and a crank mechanism (not shown) that converts the rotation of the upper shaft 22 into a reciprocating motion along the Z-axis direction.

Further, a rotating pulley 15 that can be manually rocked by the outside of the casing is fixed to one end portion of the upper shaft 22.

[Composition around the needle bar]

On the lower side of the needle bar 12 described above, a finger guard 16 is provided so as to surround the needle 11 at the time of lowering. The finger guard 16 is supported by the sewing machine arm portion 2a.

Further, adjacent to the needle bar 12, the presser foot 17 is supported by the sewing machine arm portion 2a. The presser foot 17 is supported so as to be movable up and down. When descending, the cloth to be sewn on the needle plate 13 is held up by the upper side, and when it is raised, the cloth is released. Further, the vertical movement of the presser foot 17 is given by the presser foot raising solenoid 18 (refer to FIG. 2).

Further, a brush 19 is provided on the proximal side of the needle bar 12. The brush 19 The base end portion is rotatably supported by the sewing machine arm portion 2a. The brush 19 is rotated by the threading solenoid 20 (see FIG. 2) so that the lower end portion thereof passes directly under the needle 11. Next, the brush 19 can be pulled out from the cloth by the screwing of the threaded upper thread which is introduced into the needle hole 13a of the needle plate 13 by the needle 11.

[Thread cutting device]

The thread cutting device is composed of a rotatable movable blade provided on the lower side of the needle plate 13, a fixed blade, and a power transmission mechanism that imparts a swirling motion to the movable blade. The power transmission mechanism includes: a cam mechanism that can transmit a power obtained by a lower shaft (not shown) that rotates in conjunction with the upper shaft 22 to a state of the movable blade and a disconnected state; and a tangential screw that switches the cam mechanism The conduit 21 (see Fig. 2).

The movable knife is rotated back and forth before and after passing through the pinhole in the horizontal direction of the needle plate, and is divided only by the line to be cut when the forward rotation is performed, and is performed when the rotation is reversed. Cut off.

The cam mechanism is mainly composed of, for example, a main section of the cam and a slave and tangent solenoid 21.

The main section of the cam is provided, for example, with a cam groove or a cam surface that generates a predetermined displacement, and is actuated on the lower shaft. The slave segment is composed of a roller-like member that operates in accordance with the cam groove or the cam surface, and transmits the reciprocating motion to the movable blade. The tangential solenoid 21 as an actuator is provided for engaging or disengaging the cam groove or the cam surface of the main section from the knuckle.

Wherein, the cam mechanism is powered by the lower shaft, but the motion control of each part of the sewing machine 10 is based on the detected upper shaft angle. Since the operation timing is determined, the description of the operation timing of the motion control is performed based on all the above-described axis angles.

Next, the cam mechanism also has a cam shape in such a manner that the upper shaft angle is at the timing of the upper stop position (described later) of the needle bar 12, and the movable blade cuts the upper thread.

Here, the upper stop position of the needle bar 12 refers to an angle at which the upper shaft 22 stops rotating at the end of the normal sewing, and the upper stop position is a position that stops after the completion of the tangential operation.

As described above, the upper line is cut off at the timing before the upper shaft 22 is stopped at the upper stop position, but since the slave portion of the cam mechanism must be engaged with the main portion before the start of the rotation of the movable blade, The operation of the tangential solenoid 21 is performed at a lower position of the needle bar 12 at a timing before the upper stop position. For example, when the upper axis angle of the top dead center of the needle bar 12 where the needle bar 12 is most raised is 0°, the upper stop position is set to 50°, and the lower position is set to about 205 to 250°.

That is, the tangential device formed by the above configuration is the upper shaft angle of the following position by the tangential solenoid 21 when the upper shaft 22 is performing the last half rotation of the stop when the tangential line is being executed. The movement is given in such a manner that the knot is engaged with the cam groove of the main section. As a result, the movable blade reciprocates with the joint of the cam that is actuated in accordance with the cam shape, and the upper thread is cut off at the timing before reaching the upper stop position.

[Sewing machine control system]

2 is a block diagram showing a control system of the sewing machine 10. As shown in FIG. 2, the control unit 100 of the sewing machine 10 is provided with: executing each part of the sewing machine The CPU 101 of the control program; the work memory 102 serving as the work area for the program processing; the data memory 103 for storing the setting data or the execution program for various controls; and the counter 104 for counting the pulse signals from the outside.

Further, in the control unit 100, the sewing machine motor 5, the presser foot raising solenoid 18, the dialing solenoid 20, and the tangential solenoid 21 are connected to the drive circuits 5a, 18a, 20a, and 21a, respectively.

Further, the control unit 100 is connected to a needle position detector 31 that detects that the upper shaft 22 is at a predetermined angle through an interface (not shown), and an angle sensor 32 that detects a change in the axial angle of the upper shaft 22; The operation panel 33 that performs various setting inputs for the operation control of the sewing operation is detected by the operation pedal 34 as an operation unit for the operator to manually instruct the control unit 100 to input various operations such as the execution of the tangent by the thread cutting device. A pedal sensor 35 for operating the signal; a reading/writing device 37 for recording the recording medium 36 for various setting data of the sewing operation control; and a recovery button 38.

The operation pedal 34 can perform the front step and the rear step with the neutral position as the reference position. Further, the pedal sensor 35 is provided on the operation pedal 34, and is detected at any position of the neutral position, the front step or the rear step, and is input to the control unit 100.

Next, the control unit 100 starts the sewing by stepping on the operation pedal 34, and performs the sewing stop and the tangential line by performing the post stepping.

The needle position detector 31 is mainly composed of a photo sensor and a light shielding plate fixed to the upper shaft 22. The visor is fixedly mounted on the upper shaft 22, When the upper shaft 22 is in a predetermined angular range, the photo sensor is shielded from light. Thereby, the control unit 100 can detect the upper axis angle of the start point and the end point of the angle range in which the light is blocked by the output change of the photo sensor.

In the sewing machine 10, as described above, the upper shaft angle which is the upper stop position in accordance with the pedal operation, and the upper shaft angle which becomes the top dead center in accordance with the first and second stop control which will be described later are used. Control of the sewing machine motor 5 being stopped.

Therefore, the needle position detector 31 is an upper shaft angle at which the upper stop position of the needle bar 12 can be detected and the top dead center of the needle bar 12 can be detected.

Further, as described above, the tangential solenoid 21 of the tangential device must be operated at the lower position, so that the upper shaft angle to the lower position can also be detected.

Specifically, when the upper axis angle of the top dead center of the needle bar 12 is 0°, the upper stop position is 50° and the lower position is 205°, and the needle position detector 31 can detect 0° and 50 degrees. °, and 205 °. The lower position is preferably in the range of 205 to 250°, and 205 is exemplified here as an example.

In addition, it is difficult for the needle position detector 31 to detect the upper shaft angle at two or more positions if the photo sensor and the light shielding plate are respectively provided. Therefore, when the three positions are detected as described above, the photo sensor and the light shielding plate may be additionally added. Alternatively, the needle position detector 31 may detect only one or two positions, and the remaining two positions or one position may be detected by counting the pulses of the angle sensor 32 to be described later.

The angle sensor 32 is a so-called encoder. When the upper shaft 22 rotates, the pulse signal is output at a slight uniform angular interval. Control department The counter 104 having a pulse signal 100 can be integrated by counting the pulse signals to detect the amount of change in the angle of the upper shaft 22.

For example, in the control unit 100, the current upper axis angle can be recognized by the number of integrated pulses after the position detection signal of the needle position detector 31 is input.

Further, the control unit 100 may recognize the number of stitches from the sewing by counting the number of integrated pulses of the angle sensor 32 started by sewing. In other words, the angle sensor 32 functions as a "needle number detecting unit that detects the number of stitches started by sewing."

The operation panel 33 is an input interface for setting various parameters in the sewing material used for the sewing operation control, and sewing information for selecting a sewing target from the plurality of sewing materials.

When the driving from the start of the sewing machine motor 5 to the tangential line is one step of sewing, one sewing pattern for sewing by the sewing machine 10 is composed of one to a plurality of steps. For example, in the case of the sewing pattern P shown in Fig. 3, the sewing pattern P is composed of four steps K1 to K4. Next, each of the steps K1 to K4 is sewn with a predetermined number of stitches set in advance, and the final stitches of the predetermined number of stitches are subjected to the tangent lines C1 to C4.

In other words, when the needle drop is set to a predetermined number of stitches set in advance for each of the steps K1 to K4, the control unit 100 automatically performs the operation control of the upper thread tangent by the thread cutting device.

Therefore, in one sewing material D of the sewing pattern, one to a plurality of steps constituting the sewing pattern and a predetermined number of stitches for each step are recorded as parameters. Next, the operation panel 33 is operable to set the input sewing data D The number and the number of specified stitches for each process.

The sewing data D set by the operation panel 33 is memorized in the material memory 103. Further, the sewing material D can also be formed by using an external sewing material forming device, and recorded on the non-volatile recording medium 36 in the case as described above. Then, at this time, the sewing material D is read by the reading/writing device 37 of the recording medium 36 that is provided in the control unit 100, and the sewing control is executed in accordance with the setting contents.

In other words, the data memory 103 and the recording medium 36 function as a "memory unit for a predetermined number of stitches in the memory sewing process."

The resume button 38 is a button that is pressed when the input sewing is restarted after the execution of the first stop control described later. After the execution of the first stop control, the control unit 100 is in a sewing prohibition state in which the instruction input from the operation pedal 34 is not accepted. Therefore, by the pressing of the resume button 38, the sewing prohibition state of the control unit 100 can be released, and the sewing can be restarted in accordance with the instruction input by the operation pedal 34.

Further, the sewing machine 10 is provided with a power supply circuit 50 that receives power supply from an external household power source or a commercial power source, and rectifies the sewing machine motor 5, the control unit 100, and each of the actuators 18, 20, and 21 Supply power at an appropriate voltage.

The power supply circuit 50 is provided with a power switch 53 for switching the supply and disconnection of the external power supply. Next, the power supply circuit 50 includes a power supply switching detecting unit 51 that detects a power supply state and a cutoff state by the power switch 53, and an electrolytic capacitor 52 that temporarily stores electric charge as a power storage unit when power is supplied. .

The electrolytic capacitor 52 has a charge stored in the power supply, and when the power supply is turned off by the power switch 53, the post-processing for cutting off the power supply by the control unit 100 or the second stop control, which will be described later, etc. The power is supplied to the functions of each department.

Further, the power source switching detecting unit 51 detects that the power source switch 53 is switched to the power supply state and switches to the disconnected state, and inputs the respective detection signals to the control unit 100.

[Sewing operation control]

Next, various controls regarding sewing performed by the control unit 100 will be described.

First, the basic sewing operation control will be described based on the flowchart shown in FIG.

This sewing operation control is executed in a state where the sewing material is selected by the operation panel 33.

First, the control unit 100 performs the front step of the waiting detection operation pedal 34 (step S1). When the front step is detected by the pedal sensor 35, the driving of the sewing machine motor 5 is started (step S3).

In addition, as the driving of the sewing machine motor 5 is started, the number of stitches that are integrated by the output pulse of the angle sensor 32 is counted (step S5).

Next, the control unit 100 monitors whether or not the counted number of stitches has reached the predetermined number of stitches set in the current process (step S7).

Between the start of driving of the sewing machine motor 5 and the arrival of the predetermined number of stitches, the control unit 100 determines whether or not the stepping of the operating pedal 34 has been performed by the output signal of the pedal sensor 35 (step S9). Then, if the operation is detected When the board 34 is stepped on, the control unit 100 executes the first stop control as a disconnection (step S11). This first stop control will be described later by the subroutine flowchart shown in FIG. 5.

Further, when the rear step of the operation pedal 34 is not detected between the start of the driving of the sewing machine motor 5 and the predetermined number of stitches, the control unit 100 determines whether or not the power switch has been performed by the power source switching detecting unit 51. The power of 53 is turned off (step S13). Next, when it is detected that the power of the power switch 53 is turned off, the control unit 100 also performs the second stop control as a disconnection person (step S15). This second stop control will be described later by the subroutine flowchart shown in FIG. 6.

Then, the first or second stop control is not moved, and when the number of stitches to be sewn reaches a predetermined number of stitches, the control unit 100 monitors whether the upper shaft angle has reached the tangent solenoid by the needle position detector 31. The lower position of the actuation of 21 (step S17).

Next, when the needle position detector 31 detects that the upper shaft 22 has reached the lower position, the control unit 100 operates the tangential solenoid 21 (step S19). Thereby, the knuckle of the cam mechanism of the tangential device is engaged with the main section to start the swaying motion of the movable knive.

Thereafter, the control unit 100 waits for the detection of the upper stop position by the needle position detector 31 (step S21), and the timing at which the upper axis reaches the upper stop position, and the tangential device is moving in the reciprocating rotation. The knife reaches the cutting position and the cutting of the upper thread is completed by cooperation with the fixed knife.

Next, when the upper stop position is detected, the driving of the sewing machine motor 5 is stopped (step S23).

Further, the control unit 100 causes the thread take-up solenoid 20 to operate to disengage the upper thread, and the upper thread that has been tangentially drawn is extracted from the cloth (step S25).

Next, the control unit 100 is a step in which the presser foot raising solenoid 18 is actuated to raise the presser foot 17 and the fabric is released to complete the sewing (step S27).

However, when the sewing data is composed of a plurality of steps, the processing up to the above steps S1 to S27 is repeatedly performed for each step.

[First stop control]

Next, the first stop control will be described based on the flowchart of FIG.

In the first stop control, the control unit 100 monitors whether or not the upper shaft angle has reached the lower position by the needle position detector 31 (step S41).

Next, when it is detected by the needle position detector 31 that the upper shaft 22 has reached the lower position, the control unit 100 operates the tangential solenoid 21 (step S43). Thereby, the slave joint of the cam mechanism of the thread cutting device is engaged with the main section, and the swinging motion of the movable knife is started.

After that, the control unit 100 waits for the detection of the upper stop position by the needle position detector 31 (step S45), and if it is before the upper stop position, the movable blade of the thread cutting device reaches the cutting position and the upper thread remains on the cloth. When the lower side is removed, it is cut off.

Next, when the upper stop position is reached, the drive of the sewing machine motor 5 is switched to reverse rotation (step S47). In this state, the control unit 100 waits for the detection of the top dead center by the needle position detector 31 (step S49), and if the top dead center is detected, the upper shaft is sent by the upper stop position of the needle bar 12. When returning to the top dead center position, the control unit 100 drives the sewing machine motor 5 Stop (step S51).

As described above, when the needle bar 12 is stopped at the top dead center, the needle 11 at the lower end portion of the needle bar is stopped in a state of being pulled up with the maximum upward, so that the finger guard 16 is provided even on the lower side thereof. Underneath, it is also possible to ensure a wide working area under the needle. Therefore, the threading operation of the needle hole of the needle 11 can be performed easily and smoothly.

Further, since the needle 11 is pulled up to the maximum extent, it is not necessary to pull up the needle 11 by the hand swinging operation of the pulley 15, and the threading work can be performed quickly.

Further, after the sewing machine motor 5 is stopped, the control unit 100 is in a pedal operation prohibition state in which the instruction input of the operation pedal 34 is not transmitted through the pedal sensor 35 (step S53). Then, the first stop control is ended.

When the pedal operation prohibition state is formed, the control unit 100 does not accept the operation of the operation pedal 34 until the resume button 38 is pressed. Since the sewing machine motor 5 is stopped, there is a possibility that the threading operation of the needle 11 is being performed. Therefore, by forming the pedal operation prohibition state, it is possible to prevent the sewing machine motor 5 from being driven by mistake during the threading operation.

When the disconnection occurs in a state where the predetermined number of stitches is not satisfied, and the sewing operation is resumed as described above, the automatic sewing control that automatically performs the thread trimming with the predetermined number of stitches is not switched to the manual process. Sewing.

In other words, when the operator finds that the disconnection has occurred and the rear step of the operation pedal 34 is performed, there is a possibility that the upper thread has been cut and the plurality of needle slits are being performed, even if the number of counting needles at that time is restarted. , there are also the number of stitches The possibility of deficiency is extremely high.

[Second stop control]

Next, the second stop control will be described based on the flowchart of Fig. 6 .

When the second stop control is executed, since the power supply switch 53 is turned off and the power supply from the outside is cut off, the power required for each unit is accumulated by the electrolytic capacitor 52 of the power supply circuit 50 at the time of power supply. Charge is supplied.

In the second stop control, the control unit 100 monitors whether or not the upper shaft angle has reached the lower position by the needle position detector 31 (step S71).

Next, when the needle position detector 31 detects that the upper shaft 22 has reached the lower position, the control unit 100 operates the tangential solenoid 21 (step S73). Thereby, the knuckle of the cam mechanism of the tangential device is engaged with the main section, and the swaying motion of the knives is started.

After that, the control unit 100 waits for the detection of the upper stop position by the needle position detector 31 (step S75), and if it is at the upper stop position, the movable blade of the thread cutting device reaches the cutting position and the upper thread remains on the cloth. When the lower side is removed, the cut is removed.

Next, when the upper stop position is reached, the drive of the sewing machine motor 5 is switched to reverse rotation (step S77). In this state, the control unit 100 waits for the detection of the top dead center by the needle position detector 31 (step S79), and if the top dead center is detected, the upper shaft is returned by the upper stop position of the needle bar 12. When the position is up to the top dead center, the control unit 100 stops the driving of the sewing machine motor 5 (step S81).

As with the first stop control, if the needle bar 12 is stopped at the top dead center, The workability of the threading work is improved, and the operation of the pulley 15 is not required to achieve a rapid operation.

Next, when the control unit 100 applies the correction to the setting parameter of the sewing material D in the operation panel 33, since the correction does not remain in the recording when the power source directly disappears, the corrected sewing data D is recorded in the data memory 103. Or the recording medium 36 (step S83).

Then, the electric charge in the electrolytic capacitor 52 is completely erased so that the sewing machine motor 5 or the like does not malfunction due to the electric charge remaining in the electrolytic capacitor 52 (step S85). Thereby, the power supply of the control unit 100 is also completely cut off, and the control is automatically ended.

[Technical effects of the embodiment]

In the sewing machine 10, as shown in step S9 of Fig. 4, after the number of detected stitches according to the output pulse of the angle sensor 32 reaches the predetermined number of stitches set in the current process, by operating the pedal 34 When the tangential line is input, the control unit 100 performs the operation control for stopping the sewing machine motor 5 at the top dead center position of the needle bar 12 in accordance with the first stop control (refer to step S51 of FIG. 5).

In the sewing, the reason why the operator steps the number of stitches before the predetermined number of stitches is reached is to find that the operator who has broken the wire stops the sewing machine in order to perform the recovery operation. Therefore, the control unit 100 regards the rear step of the operation pedal 34 as the disconnection of the upper thread, and stops the sewing machine motor 5 at the top dead center position of the needle bar 12. As a result, since the needle 11 comes to the highest position, the lower region of the needle 11 can be widened, and the workability at the time of inserting the needle hole of the upper needle 11 can be achieved. this In addition, since the pulley operation for moving the needle 11 upward is not required, it is possible to achieve a complicated release and recovery operation.

Further, in the sewing machine 10, as shown in step S13 of Fig. 4, if the number of detected pulses according to the output pulse of the angle sensor 32 reaches the prescribed number of stitches set in the current process, the power is switched. When the unit 51 detects the OFF of the power switch 53 (switching to the power-off state), the control unit 100 performs an operation control for stopping the sewing machine motor 5 at the top dead center position of the needle bar 12 according to the second stop control (refer to: Step S81) of Fig. 6.

In the sewing process, the power switch 53 is turned off before the predetermined number of stitches is reached, and it is highly likely that the operator who has found the disconnection stops the sewing machine in order to perform the recovery operation. Therefore, the control unit 100 regards the OFF of the power switch 53 as the disconnection of the upper thread, and stops the sewing machine motor 5 at the top dead center position of the needle bar 12. Thereby, the workability at the time of inserting the pinhole of the upper needle to the needle 11 can be improved, and the recovery operation can be accelerated.

Further, in the first and second stop controls, the control unit 100 performs "lower position detection", "tangential solenoid actuation", "upper stop position detection", and "sewing machine motor reverse rotation". The tangent of the upper thread must be performed before the sewing machine motor 5 for performing the threading operation is stopped. Thereby, the remaining line on the lower side of the fabric due to the upper thread breakage can be cut off.

In addition, the sewing machine 10 is provided with a resume button 38 as a release input unit for releasing the stop state of the sewing machine motor 5 that is stopped at the top dead center position of the needle bar 12 after the first stop control is executed, and the control unit 100 performs Until the recovery button 38 accepts the input of the release, it is formed as a pedal operation. In the prohibited state, the sewing machine motor 5 is controlled to be prohibited from being driven (refer to step S53 in Fig. 5).

Thereby, when the sewing machine 11 performs the threading operation as the recovery operation of the disconnection, or when the operation of the sewing operation is performed by the operation pedal 34, the operation of the sewing machine motor 5 can be prohibited.

Further, the control unit 100 counts the number of stitches starting from the sewing process in one of the sewing data D by the output of the angle sensor 32 (refer to step S5 of FIG. 5), and if the number of counted stitches reaches the process When the number of stitches is specified, the operation control of the tangent is automatically performed (refer to step S19 of Fig. 5).

Thereby, compared with the manual sewing in which the operator inputs the operation instruction indicated by the operation pedal 34, the burden on the worker can be reduced, and the uniformity of the sewing product can be achieved.

[Stop Control in Manual Sewing]

The sewing machine 10 described above is a manual sewing machine that allows an operator to input an operation instruction by the operation pedal 34 one by one. The mode of performing the automatic tangent according to the sewing data D described above and the mode of the manual sewing are selected by the operation panel 33.

In the manual sewing mode, when the pedal sensor 35 detects the front step of the operation pedal 34, the control unit 100 drives the sewing machine motor 5 to perform sewing, and if it detects that the front step is moved to the neutral position, The lower position of the shaft angle (205°) stops the sewing machine motor 5. When the rear step is detected, the thread cutting solenoid 21 is actuated at the lower position (205°) and the sewing machine is stopped at the upper stop position (50°) of the upper shaft angle. Motor 5.

Among them, the reason is that the upper axis is operated by the front step on the neutral position. The lower position of the angle causes the sewing machine motor 5 to be stopped, and the sewing needle 11 is stopped while maintaining the puncturing of the cloth, thereby making it easier to change the sewing method by manual work.

In the manual sewing, if the number of stitches required for one process is not set as in the case of sewing of the sewing data, it is difficult to determine whether or not the wire breakage occurs by the number of stitches at the time of thread cutting.

However, when the process determined for one sewing machine is repeatedly performed, the control unit 100 can detect the disconnection and stop the needle bar 12 at the top dead center position by the control shown below.

In the above-described manual sewing mode, the control unit 100 counts the output pulse of the angle sensor 32 at the time of sewing in each step, and executes the number of stitches from the start of sewing to the execution of the tangent as a temporary predetermined needle at the time of manual sewing. The number of data is recorded in the stitch number recording processing of the data memory 103.

Specifically, when the control unit 100 selects the manual sewing mode and detects the front step of the operation pedal 34 and the sewing machine motor 5 starts driving, the pulse of the angle sensor 32 is counted, and the operation pedal is detected. The number of pulses that have been accumulated after the stepping of 34 is calculated, and the number of stitches required for sewing is calculated. Next, the obtained number of stitches is recorded in the data memory 103 as the temporary predetermined stitch number data at the time of manual sewing.

Next, the control unit 100 performs the sewing in the manual sewing mode a predetermined number of times, and when the temporary predetermined number of stitches is accumulated for a predetermined number of times, the number of stitches indicated by the respective data is averaged, and the obtained number is obtained. The number of stitches is definitely registered in the data memory 103 as a predetermined number of stitches at the time of manual sewing. Since then, if sewing in the manual sewing mode is performed, the most recent number The temporary provision of the number of needles is updated to determine the number of needles to be registered.

When the predetermined number of stitches at the time of manual sewing is determined, the control unit 100 determines whether the number of stitches obtained as the provisional predetermined stitch number data is the same as the number of stitches to be temporarily specified for each manual sewing. The number of prescribed pins is the same. However, the coincidence with the current time may not be completely the same. For example, if it is within the range of ±10 to 20% of the predetermined number of stitches, it may be determined to be consistent as the same range. Amplitude.

Then, when they match, the new predetermined number of stitches is calculated based on the number of stitches obtained by averaging the latest provisional predetermined stitch number data and the predetermined number of temporary predetermined stitches data, and the data memory 103 is updated. record of.

Further, if they do not coincide, it is considered that the disconnection is caused by the occurrence of the disconnection during the sewing, and the same stop control as the first stop control is executed. That is, after the upper shaft is rotated to the upper stop position, the sewing machine motor 5 is reversed to stop at the top dead center position of the needle bar 12.

The stop control in manual sewing will be described below with reference to the flowchart of Fig. 7.

First, when the front step of the operation pedal 34 is detected (step S101), the control unit 100 starts driving of the sewing machine motor 5 (step S103), and integrates the output pulse of the angle sensor 32 to start sewing. The number of stitches is counted (step S105).

After that, the control unit 100 detects that the operation pedal 34 has been stepped on (step S107), and if the rear step of the operation pedal 34 is not detected, it is determined whether or not the power supply of the power switch 53 has been turned off (step S109).

Next, when the power supply of the power switch 53 is not turned off, the process returns to step S107.

When it is detected that the power of the power switch 53 is turned off, the control unit 100 determines whether the number of stitches up to now is within the same range as the predetermined number of stitches (step S111), and if it is the same, it is normal. The processing is stopped to turn off the power (step S113). In other words, the control unit 100 stops the driving of the sewing machine motor 5. If a corrected data or the like is specified, the data is stored in the data memory 103, and the electric charge in the electrolytic capacitor 52 is erased, and the control is automatically terminated.

In addition, when the number of stitches up to now is not the same as the number of predetermined stitches, the control unit 100 considers that the power-off is caused by the disconnection, and performs the same stop control as the second stop control. (Step S115: Refer to Fig. 6).

On the other hand, when the stepping of the operation panel 33 is detected, the temporary predetermined number of stitches indicating the number of stitches up to this point is calculated (step S117), and it is determined whether or not the manual sewing is performed. The same range of the number of stitches (step S119).

Then, if the number of stitches indicated by the provisional predetermined stitch number data exceeds the predetermined number of stitches, it is regarded as the execution instruction of the tangent caused by the disconnection, and the same stop control as the first stop control is performed ( Step S121: Refer to FIG. 5).

On the other hand, if the number of stitches indicated by the number of stitches is temporarily within the same range of the predetermined number of stitches, the predetermined number of stitches including the predetermined number of the predetermined number of stitches is averaged to calculate a new one. Prescribed needle Number (step S123).

Thereafter, the control unit 100 monitors whether or not the upper shaft angle has reached the lower position (step S125), and when the lower position is reached, the tangential solenoid 21 is actuated (step S127).

Further, the control unit 100 detects the waiting for the stop position (step S129), and stops the driving of the sewing machine motor 5 when the upper stop position is detected (step S131), and dials the dialing solenoid 20 for the dialing solenoid 20 In the line (step S133), the presser foot raising solenoid 18 raises the presser foot 17, and the sewing is completed (step S135).

As described above, the control unit 100 obtains the provisional predetermined number of stitches by using the output of the angle sensor 32 (see step S117 of FIG. 7) as the "sewing in each process". At this time, the stitch number detecting unit records the number of stitches of the number of stitches from the start of sewing to the tangent line.

In addition, the control unit 100 updates the predetermined number of stitches by averaging the provisional predetermined number of stitches obtained by sewing a plurality of times (refer to step S123 of FIG. 7) as "recording by the stitch number recording section" The number of predetermined stitches is determined one or more times, and the predetermined number of stitches determining the number of stitches is determined to function.

Then, the control unit 100 performs the above-described control, and automatically obtains the predetermined number of stitches even when the manual sewing is performed without setting the number of stitches, thereby detecting the occurrence of the disconnection, thereby improving the workability of the recovery work and the rapid operation time. Chemical.

Among them, in the above manual sewing example, it is exemplified that only one work will be done. In the case where the stitching of the order is made as a target, for example, in the case where the sewing pattern formed by the plurality of steps having different number of stitches shown in FIG. 3 is manually sewn, the provision of the predetermined number of stitches in each step may be obtained. First and second stop control.

For example, when sewing is performed by n steps, the number of steps is set by the operation panel 33. In this way, the control unit 100 prepares the recording areas of the first to nth temporary predetermined stitch data in the data memory 103, and sets the front panel to the rear step of the operation panel 33 as one step, in each process. When one is advanced, the obtained provisional predetermined stitch data is sequentially recorded in the recording area of the first to nth temporary predetermined stitch data. Thereby, the provisional predetermined number of stitches can be obtained for each of the n processes, and this can be repeated several times, whereby the predetermined number of stitches in each process can be determined.

Then, after the predetermined number of stitches in each step is determined, each step is performed in order, and the predetermined number of needles and the predetermined number of stitches of the corresponding step are determined, thereby detecting the disconnection. Occurs and the first or second stop processing is performed.

[other]

In the above-described embodiment, the sewing machine is exemplified as the above-described embodiment, but the type of the sewing machine is not limited thereto, and the first or the first sewing machine can be applied to the entire sewing machine in which the sewing pattern formed by one to a plurality of steps is sewn with a constant number of stitches. Second stop control.

For example, a so-called electronic cycle sewing machine that performs needle drop at any needle drop position by controlling the holding frame to hold the cloth and arbitrarily moving the holding frame along the horizontal plane can be applied. The electronic cycle sewing sewing machine The number of stitches constituting the sewing pattern is determined by sewing data in which the needle drop position or the cloth movement amount is individually set. Therefore, the number of stitches of the stitching pattern determined by the stitching data can be set as a predetermined number of stitches. Perform the first or second stop control.

Further, in the case where the number of stitches to be sewn is not prepared as a sewing machine, the stop control in the manual sewing described above may be applied.

Further, in the first and second stop controls, the control unit 100 of the sewing machine 10 performs "lower position detection", "tangential solenoid actuation", "upper stop position detection", and "sewing machine motor reverse rotation", but Alternatively, the processing may be omitted, and when the sewing machine motor 5 is driven until the predetermined number of stitches is reached, the rear step of the operation pedal 34 or the power switch OFF is detected, that is, the top dead center is directly detected, and the detection is detected. Even the operation control of the sewing machine motor 5 is stopped.

Further, the sewing machine 10 is provided with a needle position detector 31 and an angle sensor 32, but stores the upper axis angle detected by the needle position detector 31 in the memory, and sets the origin at the angle sensor 32. For the sensor, the angle of the upper axis to be detected can be detected by the angle sensor 32. In this case, the configuration of only the angle sensor 32 can be formed. At this time, only the angle sensor 32 functions as the "needle number detecting unit".

Further, by increasing the number of photo sensors and visors of the needle position detector 31, all of the upper axis angles to be detected required for control can be detected by the needle position detector 31. At this time, only the needle position detector 31 functions as the "needle number detecting unit".

In addition, the needle position detector 31 and the angle sensor 32 may also be formed as The configuration of the equal angles is detected on the lower axis.

In addition, in the stop control in the manual sewing, the predetermined number of stitches is obtained by a plurality of temporary provision of the number of stitches, but the accuracy is lowered, but the temporary provision of the number of needles can be directly used as the predetermined number of stitches, and the next time. The provisional provision of the provisional provision of the needle number data. At this time, since the provisional predetermined number of stitches per time is uneven, it is preferable to form the width in the same range as the predetermined number of stitches.

S41, S43, S45, S47, S49, S51, S53‧‧ steps

Claims (5)

A sewing machine comprising: a needle up-and-down moving mechanism, wherein a sewing machine motor moves up and down of a needle bar for holding a needle through an upper shaft; a thread cutting device performs cutting of the upper thread; and a memory unit, a rule of a memory sewing process The number of stitches; the number of stitches detecting unit detects the number of stitches from the sewing; the operating portion for artificially inputting the tangent by the thread cutting device; and the control unit for performing the operation of the thread cutting device and the sewing machine motor The control unit is characterized in that the control unit is configured to be in a state in which the number of stitches from the sewing process is equal to the predetermined number of stitches in a process detected by the stitch number detecting unit. When the operation unit is input to perform the tangential line, the operation control for stopping the sewing machine motor at the top dead center position of the needle bar is performed, and the sewing process is started by the stitch number detecting unit. When the number of stitches matches the predetermined number of stitches, the operation control for stopping the sewing machine motor at the upper stop position of the needle bar is performed, and the upper stop position is low. The upper dead point position of the needle bar rise the most, but also on the position of the axis of rotation is stopped at the end of the normal sewing. The sewing machine of claim 1, wherein the sewing machine is provided with a release input unit, and the stop state of the sewing machine motor is released, and the stop state of the sewing machine motor is stopped at a top dead center position of the needle bar, and the control unit is not described above. When the input unit is released from the input of the cancellation, the sewing machine motor is controlled to be disabled. A sewing machine comprising: a needle up-and-down moving mechanism, wherein a sewing machine motor moves up and down of a needle bar for holding a needle through an upper shaft; a thread cutting device performs cutting of the upper thread; and a memory unit, a rule of a memory sewing process The number of stitches; the number of stitches detecting unit detects the number of stitches from the sewing; the operating portion for artificially inputting the tangent by the thread cutting device; and the control unit for performing the action of the thread cutting device and the sewing machine motor a power supply circuit that supplies power to the sewing machine motor by an external power source; and a power switch that switches supply and cutoff of a power source of the sewing machine motor by an external power source by the power supply circuit, wherein the sewing machine is characterized in that The power supply circuit includes a power storage unit, and the control unit is in a state in which the number of stitches detected by the stitch number detecting unit is equal to the predetermined number of stitches. When the power switch is switched to the power supply, the operation control for stopping the sewing machine motor at the top dead center position of the needle bar is detected by the stitch number detecting unit. When the number of stitches from the sewing is equal to the predetermined number of stitches in one step, an operation control for stopping the sewing machine motor at the upper stop position of the needle bar is performed, and the upper stop position is lower than the needle bar upmost The top dead center position is a position at which the rotation of the upper shaft is stopped at the end of the usual sewing. The sewing machine according to any one of claims 1 to 3, wherein the control unit performs the following operation control: the number of stitches in one step is counted by the stitch number detecting unit, and if the counting needle is When the number reaches the predetermined number of stitches, the tangent is automatically executed. The sewing machine according to any one of claims 1 to 3, further comprising: a stitch number recording unit, wherein the stitch number detecting unit records the number of stitches from the start of sewing to the tangent at the time of sewing in each step; The predetermined number-of-pins determining unit determines the predetermined number of stitches by the number of recording stitches recorded one or more times by the stitch number recording unit.