JPS58200776A - Drive apparatus of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for starting/starting a sewing machine in accordance with a sewing machine speed command signal applied to a movement amount S of a sewing machine pedal from a reference position.
This relates to a sewing machine drive device that performs stop and speed control.

Conventionally, a sewing machine driving device has been started in such a way that the sewing machine is rotated by a depression amount of 81 from the reference position of the sewing machine pedal, and the sewing machine is driven at a low speed by a depression amount of 82 from the reference position. However, the depression-side starting position corresponding to the depression amount S1 and the depression-side starting position corresponding to the depression amount S2 can usually be easily changed, and a fixed configuration has been common.

That is, S from the reference position of the sewing machine pedal.

Detection method for the amount of depression and amount of depressing s2, and 1-
Then, the linear movement of the sewing machine pedal is converted into rotational movement by a lever, and the movement of the lever turns on and off a fixed microswitch. Alternatively, a shielding plate with a partial notch is fixed on the lever, and the Light emitted by the shielding plate? A method is adopted in which a fixed optical sensor with a pair of light receiving elements is switched, and the activation position corresponding to the amount of depression S1 or the amount of re-depression S2 is adopted.
When changing the starting position corresponding to the above, it is necessary to change the fixing position or shape of the microswitch in the former case, and the shielding plate in the latter case, which is extremely difficult and requires sewing manufacturers to improve sewing efficiency. For myself. Even if we tried to adjust the position appropriately, it was practically impossible.

The present invention eliminates the above-mentioned drawbacks of the conventional technology, and allows sewing workers to easily adjust the starting position corresponding to the amount of pressing down S1 or the amount of pressing back S2, so that the sewing worker can adjust the sewing efficiency to low/direction 1 to suit his or her needs. To provide a sewing machine driving device that allows relatively easy selection of a starting position.

FIG. 1 shows the configuration of the present invention in blocks, and the configuration will be explained below based on the diagram. A lever mechanism 1 has a mechanism for converting a linear movement position of a sewing machine pedal (not shown) into a rotational position, and the lever has a built-in magnet. Reference numeral 2 denotes speed command setting means, which comprises a lever position detection circuit 3 and an A/D converter 4, and the lever position detection circuit 3 includes a magnetic resistance element, etc., in which the rotational positions of the magnets built in the lever are opposed to each other. This is a circuit that detects the magnetic signal SA using the magnetic sensor and converts it into an electrical signal SA.
The converter 4 is a converter for converting the electrical signal SA, which is a continuous quantity, into a digital signal SD, and the specific configuration of each converter will be described later.

5 is a switch element consisting of several selection switches for selecting the starting position; 6 is a ROM and a RAM;

This is a control stage consisting of a 1-chip microcomputer (hereinafter referred to as microcomputer) that has a built-in Ilo and is the main body of Ill control. Reference numerals 7 and 8 indicate drivers for the clutch coil 10 and brake coil 11, respectively, which are built into the motor 9. The motor 9 has a main body of the motor that constantly operates at high speed, and uses the same rotational force of the motor to drive the clutch and brake coils. It consists of an electromagnetic clutch/brake section configured to transmit excitation to the output shaft through its magnetic circuit, and the rotational force of the motor 9 is transmitted to the sewing machine 12 via a belt. Reference numeral 13 denotes a needle position detector attached to the shaft end of the sewing machine 12, which outputs a needle position signal in response to the needle position of the sewing machine 12, either by an original sensor configuration using a pair of a light emitting element and a light receiving element, or by a configuration using a magnet and a magnetic sensor. (For example, a needle up position signal Nu corresponding to the needle up position and a needle F11 position signal ND corresponding to the needle down position) are generated. 14 is a speed generator that detects the abnormality of the min/12 and generates a frequency meter j according to the detected speed; 15 is a speed generator that shapes the waveforms of A and □ shift from the speed generator 14 and generates a pulse signal FG. This is a waveform shaping circuit for output, and is composed of an output trigger circuit V.

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First, when the sewing machine pedal is depressed from the reference position, the built-in lever of the lever mechanism 1 rotates by a displacement sx, and the lever position detection circuit 3 converts the displacement Sx into an electric signal and outputs an analog signal sA. This analog signal sA is converted into a digital signal SD by the A/D converter 4 and input to the microcomputer 6. The microcomputer 6 sets the digital signal SD to the specified value s selected by the switch element 5.
1, the clutch coil 10 is excited through the driver 7, the output shaft of the motor 9 is accelerated, and the sewing machine 12 is accelerated through the belt. The speed of the sewing machine 12 is detected by the speed generator 14, and after being waveform-shaped into a pulse actual speed signal FG by the waveform shaping circuit 16, it is output to the microcomputer 6, which receives the actual speed signal Fa from the digital setting. When the speed exceeds the speed set by the signal SD, the brake coil 11 is excited via the driver 8, acting to rapidly decelerate the sewing machine 12, and the normal stable state is determined by the magnitude K of the excitation current of the clutch coil 1o. Control is provided to ensure that the results are obtained.

When the digital setting signal SD becomes smaller than the specified value S1, the microcomputer 6 first sets the sewing machine 12 at a low speed for positioning, and after reaching a further low speed, the needle position detector 13 detects the needle down position. When the position signal ND is detected, the brake coil 11 is excited through the driver 8, and the sewing machine 12 is stopped at a predetermined needle lower position.

When the sewing machine pedal is pressed back in the opposite direction from the above-mentioned stopped state, the digital setting signal SD corresponding to the position of the sewing machine pedal is output as described above, and the digital setting signal SD is applied to the switch. When the value reaches the predetermined value 82 or less selected by element 6, the microcomputer 6 first sets a low speed for positioning, drives the sewing machine 12 at a low speed, and further detects the needle height from the needle position detector 13. Stop when the position signal is detected.

1. As mentioned above, a drive/stop command or a manual drive command to move the needle to the upper position is issued depending on whether the digital setting signal SD becomes higher than the specified value S1 selected by the switch element 5. is done, but here the microcomputer 6
The operation of the speed command setting means 2 and the switch element 5 which constitute the input section to the motor will be explained with reference to FIG.

In the figure, reference numeral 16 denotes a bridge-type magnetoresistive element, and its output voltage ve changes in accordance with the rotational displacement S of the lever when a constant excitation current is applied from the DC power source Vcc through the resistor R1. .

The resistors R2 to R6 and the operational amplifier ICf form a differential amplifier circuit, and the output signal V. is differentially amplified and a signal S8- is output. IC2 is an A/D converter converter 4. Its operation begins with the input of the STC signal from the microcomputer 6.
Conversion to the signal S starts by transitioning from the "Hl" state to the "L I+ state," and when the conversion to the digital value is completed, the A/D converter IC2 sets the converted 1-ta. At the same time, the EOC signal is changed from n Hn to "L", and the microcomputer 6 manually inputs the A/D conversion data SD by changing the EOC signal to "L I+".

If, for example, a 6-bit model is used as the A/D converter IC2, the relationship between the conversion data SD and the pedal depression position Sx is as shown in FIG.
It will be converted into each value from ○'' to ``31'' (decimal number).

The reference position of the sewing machine pedal is A/D converted, and the converted data SD'''c becomes 9'' in FIG. 3.

On the other hand, the switch element 5 includes the switch 5Do-8D1, the switch SuoΦSu1, and the respective pull-up resistors R6 to R.
9 and is input to the microcomputer 6.

The switch 5Do-8D1 is a switch for selecting the starting position for the pedal depression side, and the switched switch 5uo-8u1 is a switch for selecting the respective starting position for movement to the pedal depression side. Since there are two types for each type, four types can be selected.

In other words, the microcomputer 6 first outputs the conversion data S to the built-in ROM table according to the selection of the switch group.
It is converted into a value corresponding to D and indicating the starting position of the sewing machine as shown in Tables 1 and 2.

Table 1 Table 2 Furthermore, the microcomputer 6 uses the data SD after A/D conversion that has been continued as described above, and the data DRD or D converted by the switch manually using the built-in ROM table.
If the data SD is, for example, greater than or equal to the data DRD, Mi// will be driven at a speed according to the position of the pedal, and the speed operation will be performed at the set tl; if the data SD is less than or equal to the data DRu. The sewing machine is started and operated to be manually driven to the needle up position as described above.

The above operation is shown in FIG. In the figure, solid lines indicate a state in which all the switches are off. That is, the data DRD=15 and the data DRu=
3 state is shown. In addition, by selecting the switch, it becomes possible to select four types of starting positions for both the depressing side and the depressing side, as shown by the broken lines.

As described above, the starting position S1 on the depressing side of the sewing machine pedal is selected in four stages by the switches 5Do-8D1, and the starting position S2 on the depressing side is selected in four stages by the switches 5uo-8u1. A/
By increasing the data SD after D conversion to more than 6 bits and by using a large number of the switches, even finer selection becomes possible, and the present invention exhibits its effects even more.

As is clear from the above two statements, the present invention provides a starting position S1 on the depressing side corresponding to depressing in the depressing direction from the reference position of the sewing machine pedal, or a depressing side starting position S1 corresponding to depressing in the depressing direction from the reference position of the sewing machine pedal. The turning side starting position S2 can be selected by a switch element, so that, for example, a sewing worker can very easily adjust the starting positions S1 and S2 to suit each person, improving sewing efficiency, and the effect is remarkable. It is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the sewing machine driving device of the present invention, FIG. 2 is a circuit diagram showing the specific configuration of the device, and FIG. 3 is an explanatory diagram showing an example of A/D conversion data for the pedal depression position in the device. , FIG. 4 is an explanatory diagram showing a configuration example of the sewing machine speed with respect to the pedal depression position. 1 Lever mechanism, 2...Speed command setting means, 3
Lever position detection circuit, 4... A/D converter, 6 Switch element, 6... Control means (microcomputer), 9 Motor, 12- Sewing machine, 13-... Needle position detector, 1
4...Speed generator. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 398 Figure 3 @ Figure 4 '41 Applicant's Office 1' Indication of the matter November 1988 Patent Application No. 83421 2 Name of the invention Sewing machine drive device 3 Sleeve straightening n 4]・1 Part 1・・：、'Stable Patent Application Resident Residence No.r 10 Oaza Kadoma, Kadoma City, Osaka Prefecture
06 address name (1. (582) Matsushita Electric Industrial Co., Ltd., ゛, 1j111 Shun Shimo
Hiko 4 Agent Address: 2, Matsushita Electric Industrial Co., Ltd., 1006 Hitoma Kadoma, Kadoma City, Osaka 571, Japan Claims (1) A motor that drives a sewing machine, a control means that controls the variable speed of the motor, a lever mechanism mechanically connected to the sewing machine pedal, a speed command setting means for converting the mechanical movement amount of the lever mechanism into an electrical signal and commanding the speed; The speed command setting means includes a switch element that defines the starting position of the corresponding sewing machine, and the speed command setting means sets the reference position V of the lever mechanism.
Here, the sewing machine is commanded to stop by a movement amount S of the sewing machine pedal °) from the reference position in a specified direction, while the control means controls the sewing machine according to the switch element. The sewing machine driving device according to claim 1, wherein the specified direction is a depression direction of the sewing machine pedal. (3) The specified direction is a direction in which the sewing machine pedal is depressed. The sewing machine driving device according to claim 1, wherein d' is the direction in which the sewing machine pedal is depressed.(4) The speed command setting means includes an A/D converter, and the d' A/D converter causes Claim i/In which the electric signal is converted into a digital signal and outputted.
f9 The sewing machine drive device according to item 1.

Claims (1)

[Scope of Claims] 1 Sewing machine, ffi A moving motor, a control means for variable speed control of the motor, a lever mechanism mechanically connected to the sewing machine pedal, and an electrical signal that controls the mechanical movement of the lever mechanism. and a switch element that determines a starting position of the sewing machine corresponding to movement of the sewing machine pedal, and the speed command setting means sets the lever mechanism to a reference position. The control means commands the switch element to stop F, and commands the sewing machine to start when the sewing machine pedal moves from the reference position in a prescribed direction S.
7, a sewing machine driving device configured to adjust a starting position S corresponding to the amount of movement S; 2. The sewing machine drive device according to claim 1, wherein the specified direction is the direction in which the sewing machine pedal is depressed. 3. The sewing machine drive device according to claim 1, wherein the prescribed direction is a direction in which the sewing machine pedal is pressed back. 4. The sewing machine driving device according to claim 1, wherein the speed command setting means includes an A/D converter, and the A/D converter converts the electric signal into a digital signal and outputs the digital signal.