JPH07670A - Setting work instructing device for sewing machine - Google Patents

Abstract

PURPOSE:To provide a setting work instructing device for sewing machine capable of easily and precisely conducting the position setting work of a movable member. CONSTITUTION:A setting work instructing device for sewing machine has a standard setting means SW2 for setting the standard position of a sewing machine main spindle; rotating angle detecting means 12, 202 for detecting the rotating angle of the sewing machine main spindle; a movable member to be mounted on the sewing machine in such a manner as to be positionally adjustable; an input means I for inputting the set position of the movable member as the rotating angle from the standard position of the sewing machine main spindle; and a judging means 204 for judging whether the rotating angle of the sewing machine main spindle is conformed to a rotating angle preliminarily inputted by the input means or not. This device is further provided with a notifying operation control means 20 for operating prescribed notifying means L1-L6 on the basis of the judgment result; a mode setting means SW1 for setting the driving mode of the sewing machine to general sewing mode and positioning mode; a motor control means 201 capable of driving a motor MM at low speed when the positioning mode is set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine setting work instructing device used for setting a position of a movable member such as a sewing machine hook or a thread trimming cam which operates in conjunction with rotation of a sewing machine main shaft. .

[0002]

2. Description of the Related Art As is well known, in a sewing machine, many movable members are designed to operate on the basis of the lifting and lowering operations of a sewing needle, and in order to properly operate the sewing machine as a whole, the sewing needle must be moved up and down. On the other hand, it is necessary to set each movable member at an appropriate position. For example, as the movable member attached in association with the elevation position of the sewing needle, a sewing machine hook attached to the sewing machine lower shaft (operating unit), and a thread fixed to the sewing machine lower shaft (operating unit) as a drive source of the thread trimming mechanism. There is a stop cam and a stop position detector that issues a stop signal to stop the sewing machine when the sewing needle is in the upper stop position and the lower stop position, respectively. It is essential for proper operations such as cutting and stopping of the sewing needle.

Therefore, in the conventional sewing machine, the work for setting the position of the movable member is performed as follows. That is, in the work for setting the position of the sewing machine, first, as shown in FIG. 7, the lower end of the needle bar metal 5 that supports the needle bar 4 so that it can move up and down is aligned with the marking line 4a formed on the needle bar, and the state is maintained. On the other hand, as shown in FIG. 8, the sword tip 3a of the sewing machine hook 3 is positioned on the ascending / descending path NL of the sewing needle N, and then the sewing machine hook 3 is fixed to the lower shaft 2 of the sewing machine.

In the thread trimming cam position setting operation, first, as shown in FIGS.
The index Ma1 formed on the a and the marking line 6a for the cam formed on the flywheel 6 are made to coincide with each other, and while maintaining this state, FIG.
The roller 10 is fitted at the thread cutting operation start position in the cam groove 9a of the thread cutting cam 9 shown in FIG.
Is fixed to the lower shaft 2 of the sewing machine.

The above-mentioned stop position detecting device is shown in FIG.
As shown in (c), a pair of magnets 7a and 7b fixed to the end surface of the flywheel 6 (actuating portion) and a magnetic sensor 8 fixed to a surface of the sewing machine arm facing the flywheel 6 are provided. Each magnet 7a, 7b
The detection signals are output from the respective magnetic sensors 8 when the two are directly opposed to each other, and one detection signal is used as the upper position stop signal and the other detection signal is used as the lower position stop signal. There is.

In the work of setting the upper stop position in this stop position detecting device, first, as shown in FIGS. 10 (a) and 10 (b), the index Ma1 formed on the sewing machine arm Ma and the marking line 6b formed on the flywheel 6. And one of the magnets 7a is connected to the sewing machine arm Ma while maintaining that state.
It is carried out by setting it at a position facing the detection unit 8 fixed to, and when adjusting the lower stop position,
First, as shown in FIG. 7, the distance t from the upper end of the needle thread insertion hole Na of the sewing needle N to the needle plate NB is set to a predetermined value, and while maintaining this state, the other magnet 7b is connected to the detection unit 8
This is done by setting the position opposite to.

As described above, in order to set the positions of the movable members 3, 7a, 7b, 9 and the like, first of all, as a first setting operation, the sewing needle N such as the needle bar 4 and the flywheel 6 is moved up and down. A member indicating a position (hereinafter, this member is referred to as a reference member)
Position and hold the position of the reference member,
As the second setting work, the position of the movable member is set to the position corresponding to the reference member. The order of performing the first setting work and the second setting work may be reversed. For example, after setting the sword tip 3a of the sewing machine hook 3 in the needle bar elevating path, the needle bar 4 is engraved. The line 4a may be aligned with the lower end of the needle bar metal 5.

As described above, the movable members 3, 7a, 7
By setting the positions b, 9 and the like, the stitch forming operation, the upper and lower position stopping operation, the thread cutting operation and the like can be executed corresponding to the lifting operation of the sewing needle N.

[0009]

However, in the above-mentioned conventional sewing machine, the flywheel 6 is used in the first setting operation.
Since the two members such as the sewing machine arm Ma and the needle bar 4 and the needle bar metal 5 have to be aligned with each other each time, there is a disadvantage that a lot of working time is required and the reference member is Since there are two types, a flywheel and a needle bar, even an inexperienced operator may erroneously select the reference member, and there is a problem that good workability cannot be obtained.

Further, in the conventional sewing machine, the actual sewing needle N
Since the needle bar 4, the flywheel 6, and the like that interlock with the sewing needle N are used as reference members without using the position of No. as a reference member, if such members have dimensional errors or assembly errors,
No matter how accurately the movable member setting operation (second setting operation) is performed, an error will occur between the movable members, and there has been a problem that an appropriate sewing operation cannot be performed.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide an instruction device for setting work of a sewing machine, which can easily and accurately adjust the position of a movable member. .

[0012]

SUMMARY OF THE INVENTION According to the present invention, reference setting means for setting a reference position of a sewing machine spindle rotated by driving a sewing machine motor and rotation angle detecting means for detecting a rotation angle of the sewing machine spindle from the reference position. And an input means for inputting a plurality of movable members attached to the sewing machine operating portion so as to be adjustable in position and a set position of the movable member corresponding to a predetermined elevation position of the sewing needle as a rotation angle from the reference position of the sewing machine main shaft. A discriminating means for discriminating whether or not the rotation angle of the sewing machine main spindle and the rotation angle preliminarily inputted by the input means, and a notice for activating a predetermined notifying means based on the discrimination result of the discriminating means. The operation control means, the mode setting means for selectively setting the normal sewing mode and the positioning mode as the drive mode of the sewing machine, and the mode setting means Motor control means for switching the drive state of the sewing machine motor according to the drive mode set by the above, the motor control means, while enabling the motor to be driven at the normal drive speed when the normal sewing mode is set, The motor can be driven at low speed when the positioning mode is set.

Further, a braking means is provided for the sewing machine motor, and when the rotation angle of the sewing machine main shaft coincides with the rotation angle previously inputted by the input means, the braking means is operated by the motor control means to operate the sewing machine. The rotation of the main shaft may be braked.

[0014]

In the present invention, the reference position of the sewing machine main shaft is set by the reference setting means, and the set position of the movable member corresponding to the predetermined elevation position of the sewing needle is input as the rotation angle from the reference position of the sewing machine main shaft. After that, after selecting the positioning mode by the mode setting means, the sewing machine spindle is rotated at a low speed by manual operation, etc., and the position of the sewing machine spindle is maintained when the notifying means is activated, and the movable member is moved. Position setting (second setting work) may be performed. That is, the worker can perform the setting work (first setting work) of the sewing machine spindle according to the notification operation of the notification means without confirming the positions of the sewing needle and the reference member, and can easily perform the position setting. .

Further, when the rotation angle preliminarily input by the input means and the rotation angle of the sewing machine spindle match, the braking means is operated to brake the rotation of the sewing machine spindle, whereby the position of the movable member is set. In the work, it is not necessary to continue to hold the set position of the sewing machine spindle set by hand, and the worker can concentrate on the work of setting the position of the movable member.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
It will be explained based on. It should be noted that the same or corresponding parts as those of the above-mentioned conventional technique are designated by the same reference numerals, and detailed description thereof will be omitted.
FIG. 1 is a block diagram showing the overall configuration of this embodiment. In the figure, reference numeral 20 is a well-known microcomputer, which is composed of a CPU 21, a ROM 22, a RAM 23, etc. An encoder 12 as a pulse signal generating means for emitting a pulse signal, a drive circuit 14 for the sewing machine motor 13 and the like are connected.

Further, on the operation display panel 11, a mode setting switch (mode setting means) SW1 for setting a drive mode of the sewing machine and a reference position setting switch (reference setting means) SW2 for setting a reference position of the sewing machine spindle 1. A set switch SW3 that is pressed when the position of each movable member, which will be described later, is completed, a data input unit (input means) I including a numeric keypad, and a display D as a notification means are provided. .

This display D comprises a plurality of light emitting diodes L1.
.About.L6, of which L1 is a light emitting diode for the hook indicating that the rotation angle of the sewing machine spindle 1 has reached the angle at which the position of the hook should be set, and L2 is the rotation angle of the sewing machine spindle 1 for the cam. L3 is a light emitting diode for a cam that indicates that the position should be set, and L3 is a light emitting diode for lower stop that indicates that the rotation angle of the sewing machine spindle 1 is an angle at which the sewing needle N should be stopped downward. Is an upper stop light-emitting diode which indicates that the rotation angle of the sewing machine main shaft 1 has reached the angle at which the sewing needle N should be stopped upper. Further, L5 is an upper stop light emitting diode indicating that the upper stop magnet 7a and the magnetic sensor 8 face each other in the adjustment stop position detector shown in FIG. 10, and L6 is the lower stop magnet 7b. 8 is a bottom stop light emitting diode showing that it is directly opposed to 8.

FIG. 2 is a block diagram showing the main functions of the microcomputer 20 in this embodiment. In the figure, 201 is a display device D via a drive circuit LD and a motor drive circuit MD of the display device. And control means for controlling the sewing machine motor (notification operation control means, motor control means), to which the signals sent from the mode changeover switch SW1, the set switch SW3 and the like are inputted. Further, 202 is a counting means for counting the pulse signals sent from the pulse generator 12, and 203 is a rotation angle of the sewing machine spindle 1 inputted by the data input section I and a count value outputted by the counting means 202. The determination result of this determination means 204 is input to the control means 201. In addition,
The motor drive circuit MD includes a drive unit MD1 that drives the sewing machine motor MM to rotate the sewing machine spindle 1, and a braking unit (braking means) MD2 that applies braking to the sewing machine motor MM. The control means 201
Is selectively driven by.

Next, the operation will be described based on the above configuration.
After the power is turned on, the operator first selects the mode switch SW
The mode changeover switch SW1 is used to select whether to perform the sewing operation by 1 or the adjustment operation of the movable member. Here, when the sewing operation mode is selected, the control means 201 sets the sewing machine motor in a state in which the sewing machine motor can be driven at a normal sewing speed (steps O1, O2), and the sewing operation is performed at the same time when the sewing start command is input. Let it run.

When the movable member adjusting operation mode is selected in step O1, the control means 201 allows the sewing machine motor MM to be manually rotated via the motor drive circuit MD (step O3). ). Then, the operator sets a reference position in the rotation direction of the sewing machine main shaft 1.
This is done by manually rotating the flywheel 6 and
The rotation is stopped at the time when a predetermined elevating position has reached a top dead center, for example, and the reference setting switch SW2 is pressed. That is, when the reference setting switch SW2 is pressed, the count value set in the counting means 202 is reset (step O4). The reference position does not have to be the top dead center of the sewing needle N, but may be any other position such as the bottom dead center as long as the rotational position of the sewing machine main shaft 1 can be specified.

Next, the operator inputs the position where the position setting operation of each movable member is to be performed as the rotation angle of the sewing machine main shaft 1 from the reference value. For example, the position setting work of the sewing machine is
As shown in FIG. 8, the sword tip 3a of the sewing machine hook 3 is made to coincide with the ascending / descending path NL of the sewing needle N. In the setting work of the sewing machine hook 3, the rotation angle of the sewing machine main shaft 12 from the reference position is 210 degrees. This angle is input by the data input unit I (step 06). Then, the input rotation angle is stored in the storage unit 203 (step O7).

After setting the reference position of the sewing machine main shaft 1 in this manner, the operator performs a position setting operation of the sewing machine hook 3 which is one of the movable members according to steps A1 to A7.
That is, when the sewing machine spindle 1 is manually rotated,
Along with the rotation, the encoder 12 outputs a number of pulse signals corresponding to the rotation angle, and the counting means 202 counts the number of pulse signals (step A3). Then, this count value is input to the determination means 204. In the discriminating means 204, the rotation angle of the sewing machine spindle 1 corresponding to the input count value coincides with the rotation angle (210 degrees) for storing the sewing machine hook 3 stored in the storage means 203. It is determined whether or not there is a match (step A3), and if there is a match, a match signal is output to the control means 201.
Send to. Upon receiving this coincidence signal, the control means 20
1 turns on the light emitting diode L1 for the shuttle via the drive circuit LD (step A4). Thereby, the worker can perform the work of setting the rotational position of the sewing machine main shaft 1, that is, the first setting work according to the lighting of the light emitting diode L1 for the shuttle. Therefore, the work can be performed easily and quickly as compared with the conventional first setting work which is performed by aligning the needle bar 4 and the needle bar metal 5.

Further, the control means 20 which has received the coincidence signal
At the same time, the sewing machine motor MM is braked via the braking portion MD2 of the motor drive circuit MD at the same time as turning on the shuttle light emitting diode L1 as described above (step A).
5) Prevent the careless rotation of the sewing machine main shaft 1. Therefore, after the first setting work, the sewing machine main shaft 1 does not rotate carelessly without continuing to hold the sewing machine main shaft 1 with a hand or the like, and the operator performs the second setting operation, that is, the sewing machine lower shaft 2 ( It is possible to concentrate on the position setting work (step A6) of the sewing machine hook 3 with respect to the working part, and the workability is greatly improved.

After the second setting work, the operator pushes the set switch SW3. Then this set switch SW3
In response to the signal from the control means 201, the light emitting diode L1 for the shuttle is turned off through the drive circuit LD, the braking of the sewing machine motor MM by the braking portion MD2 is released, and the sewing machine spindle 1 becomes rotatable ( Steps A7-A
9).

After that, the worker is to lower the sewing machine lower shaft 2 (actuator).
The position setting operation for the thread trimming cam and the position setting operation for the flywheel 6 (actuator) of the magnets 7a and 7b provided in the stop position detector are sequentially performed according to the flowcharts of FIGS. Of these steps, steps B1 to B8 in the position setting operation of the thread trimming cam 9 can be performed in substantially the same manner as the position setting operation of the sewing machine hook 3 shown in steps A1 to A9. That is,
As the first setting operation, the sewing machine spindle 1 is manually rotated until the cam light emitting diode L2 is turned on, and when the cam light emitting diode L2 is turned on, the thread trimming cam 9 is fixed at a predetermined position on the sewing machine lower shaft 2. (The second setting work is performed), and then the set switch SW3 is pushed.

Also in the setting work of both magnets 7a and 7b in the stop position detector, the first setting operation is performed in steps C1 to C5 and steps D1 to D5 as in the case of steps A1 to A5 described above. be able to. Then, the second setting work performed thereafter is performed by directly facing the magnets 7a and 7b to the magnetic sensor 8, respectively.
It is quite difficult to visually confirm whether or not the magnets are facing each other. Therefore, here, the magnets 7a and 7b are
Also in the setting operation (second setting operation) of step C6
.About.C8 and D6 to D8 can be performed using a display device.

That is, when the magnets 7a and 7b are moved so that the magnets 7a and 7b directly face the magnetic sensor 8, the control means 201 causes the light emitting diode of the display D to operate based on the detection signal output from the magnetic sensor 8. L5
L6 is turned on (steps C6 to C
8 and D6-D8). Therefore, it is possible to determine whether or not the magnets 7a and 7b are in proper positions depending on whether or not the light emitting diode L1 is turned on, and it is possible to obtain good operability.

Finally, when the set switch SW3 is pressed, the light emitting diodes L3, L5, and L4, L6 are turned off, and the braking on the sewing machine motor MM is released (steps C9 to C12, D9 to D12).

In the above embodiment, when the first setting work is completed, the sewing machine motor MM is braked to prevent the sewing machine spindle 1 from rotating unintentionally. May be directly locked by using an actuator such as a solenoid. Further, the notification means is not limited to the display device D, and a voice generating device such as a buzzer can be used.

Further, in the above embodiment, in the first setting work, the sewing machine motor MM is set in the non-driving state and the sewing machine main shaft 1 is manually rotated. However, a servo motor is used as the sewing machine motor to perform the first setting operation. The first setting operation can be automated by rotating the sewing machine spindle 1 at low speed.

Further, in the above description, the sewing machine hook 3, the thread trimming cam 9 and the magnets 7a, 7b were taken as examples of the movable members to be set. However, the present invention is not limited to this.
The present invention can be applied to a setting operation of a movable member other than the above movable member, and the present invention is not particularly limited to the above embodiment.

[0033]

As described above, in the sewing machine setting operation instructing device according to the present invention, only the sewing machine main shaft is used as the reference member indicating the ascending / descending position of the sewing needle, and the rotation angle of the sewing machine main shaft is the position of the movable member. Since the notification means is activated at the time when the angle at which the setting should be performed is reached, the worker can reach the position where the notification means operates in the position setting operation (first setting operation) of the reference member in the position setting operation of the movable member. Since it suffices to rotate the main shaft of the sewing machine, it is not necessary to check the position of the reference member or the like each time as in the conventional case, the first setting operation can be performed extremely easily, and workability is greatly improved. Further, since the work of mounting all the movable members is performed with the sewing machine spindle as a reference, an error does not occur in the positional relationship between the movable members, and the mounting accuracy is significantly improved.

Further, when the rotation angle of the sewing machine spindle reaches the angle at which the position of the movable member should be set, the notifying means is activated and the sewing machine motor is braked, whereby the position of the movable member is set. In the work, it is not necessary to keep the rotational position of the sewing machine spindle set by the first setting work by hand. For this reason, the worker can concentrate on the work of setting the position of the movable member, and can obtain better workability.

[Brief description of drawings]

FIG. 1 is an explanatory diagram schematically showing the overall configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing main functions performed by a microcomputer in the embodiment.

FIG. 3 is a flowchart showing a mode setting operation, a reference position setting operation, a hook position setting operation, and the like in the same embodiment.

FIG. 4 is a flowchart showing a thread trimming cam setting operation and the like in the same embodiment.

FIG. 5 is a flowchart showing a setting operation of a lower stop position of a sewing needle in the above-mentioned embodiment.

FIG. 6 is a flowchart showing an operation of setting an upper stop position of a sewing needle in the same embodiment.

FIG. 7 is an explanatory side view showing the positional relationship between the needle bar and the needle bar metal in the position setting work of the conventional sewing machine hook.

FIG. 8 is an explanatory perspective view showing a setting work state of a conventional sewing machine hook.

FIG. 9 is a perspective view showing a thread cutting cam and rollers.

10A is a perspective view showing an index formed on a conventional sewing machine arm and engraved lines formed on a flywheel, FIG. 10B is a side view of what is shown in FIG. 10A, and FIG. 10B is a flywheel. It is a side view showing a state seen from the side facing the sewing machine arm.

[Explanation of symbols]

1 sewing machine spindle 3 sewing machine hook (movable member) 7a upper position stop magnet (movable member) 7b lower position stop magnet (movable member) 9 thread trimming cam (movable member) 12 encoder (pulse generating means) 20 microcomputer 201 control Means (notification operation control means, motor control means) 204 Discrimination means SW1 Mode setting switch (mode setting means) SW2 Reference setting switch (reference setting means) MD2 Braking unit (braking means)

Claims (3)

[Claims] 1. A sewing machine main shaft rotatably supported by a sewing machine frame and rotated by driving a sewing machine motor, reference setting means for setting a reference position in the rotating direction of the sewing machine main shaft, and a reference position from the reference position. The rotation angle detecting means for detecting the rotation angle of the sewing machine spindle, a plurality of movable members attached to the operating portion of the sewing machine so as to be positionally adjustable, and a set position of the movable member corresponding to a predetermined elevation position of the sewing needle are set on the sewing machine. Input means for inputting as a rotation angle from the reference position of the spindle, discrimination means for discriminating whether or not the rotation angle of the sewing machine spindle and the rotation angle previously inputted by the input means match, and the discrimination means Notification operation control means for activating a predetermined notification means based on the discrimination result, and a normal sewing mode and a positioning mode are selectively selected as drive modes of the sewing machine. And a motor control means for switching the driving state of the sewing machine motor according to the drive mode set by the mode setting means, wherein the control means is a normal sewing mode when the sewing mode is set. An instruction device for setting work of a sewing machine, wherein the motor can be driven at a driving speed, while the motor can be driven at a low speed in a setting state of a positioning mode. 2. The rotation angle detection means includes pulse signal generation means for generating a number of pulse signals according to a predetermined rotation amount of the sewing machine spindle, and counting means for counting the number of pulses output from the pulse signal generation means. The sewing machine setting work instruction device according to claim 1 or 2, comprising: 3. The sewing machine motor is provided with a braking means for applying a braking force, and when the rotation angle pre-input by the input means and the rotation angle of the sewing machine spindle match, the braking means is operated to operate the sewing machine spindle. 3. The sewing machine setting work instruction device according to claim 1, wherein the rotating position is held.