JPH0647432Y2 - Sewing machine dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of Invention] (Industrial field of application) This invention relates to a dust collecting device of a sewing machine, and is widely used for equipment of the sewing machine including industrial use.

(Prior Art) Conventionally, a dust collecting box in a sewing machine has been used in a state of being placed on the floor independently of legs and a table.

Further, it is also known that two types of dust collecting boxes for thread waste and cloth waste are provided, and a large dust collecting box for cloth waste is arranged on the floor (Japanese Patent Publication No. 60-33079).

However, these dust collection boxes are cumbersome because they need to be carried separately when the table is placed and moved, and the size of the device is large, and there is a problem in effective use of the floor area.

Therefore, the dust box is placed on the base of the sewing machine so that it can be attached and removed freely, and a suction pipe that connects with the blower motor and a suction pipe that sucks lint and cloth debris are attached to this, and the blower motor can be installed only when the sewing machine is driven. It was thought that it was made to rotate.

(Problems to be solved by the invention) In the case of the motor without a clutch (DC servo motor, AC servo motor), a plurality of foot switches (foot pedal, foot pedal,
For a sewing machine that operates at a low speed or a high speed, for example, in order to rotate the blower motor only when the sewing machine is driven, another limit switch that is turned on at the same time as the existing limit switch that is turned on during operation is required in the foot switch.

Then, the blower motor is rotated by turning on and off the contact. Therefore, if there are multiple foot switches of the foot switch, such as a low-speed switch and a high-speed switch, in order to rotate the blower motor, the same number (plural) of limit switches are required, and the accompanying configuration However, there is a drawback that the wiring etc. becomes complicated.

Recently, there is a sewing machine motor that does not rotate even when the foot switch is stepped on when there is no thread.In this case, the blower motor rotates even though the sewing machine motor does not rotate, and when it is not needed, the blower motor does not rotate. Causes the inconvenience of working.

An object of the present invention is to eliminate the above-mentioned drawbacks and inconveniences and to properly achieve a dust collecting function.

[Constitution of device]

(Means for Solving the Problems) In order to solve the above problems, the present invention takes the following means. That is, a sewing machine rotation detection unit that detects the rotation of the sewing machine motor and a signal that is output from the sewing machine rotation detection unit when the sewing machine motor is rotating are input, and a rotation output signal is output to the switching circuit according to the signal. And a control circuit for controlling the switching circuit so that the blower motor is rotated by the output.

Then, the switching circuit, the integration circuit is built in,
That is, the rotation signal is output so as to rotate the blower motor for a certain period of time longer than the rotation output signal.

(Operation) When the low-speed or high-speed switch is depressed, the sewing machine motor correspondingly rotates at low speed or high speed. Then, a rotation output signal is sent to the switching circuit directly in response to the rotation of the sewing machine, and the blower motor rotates.

Further, the switching circuit uses the integration circuit to rotate the blower motor for an additional period of time even after the operation of the sewing machine is completed.

When the sewing machine stops due to thread breakage or the like except for the rotation for an extra fixed time, the blower motor alone does not rotate due to the thread breakage detection output signal.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, reference numeral 1 indicates a mince that generates thread waste and cloth waste such as a known overlock sewing machine.

2 is a sewing machine table, 3 is a leg, 4 is a base of the leg, 5 is a caster, 6 is a blower motor for performing a suction action,
It is fixed to the back surface of the table 2 and operates in synchronization with the rotation of the sewing machine.

Reference numeral 7 is a suction pipe for connecting the blower motor 6 and the dust collecting box cover 11, and 8 and 9 are suction pipes for sucking thread waste and cloth waste of the sewing machine, one end of each of which is provided at the waste generating portion of the sewing machine. To be done. 10 is a trash box for storing trash, 11 is its cover,
A filter 12 for fixing the suction pipes 7, 8, 9 on the upper surface and for arranging the suction pipe 7 on the rear surface so as to cover the opening of the suction pipe 7, and a filter 12 for preventing suction of yarn waste and cloth waste into the blower motor 6, Dust collection box 10
A packing 13 made of an elastic member that closes the gap between the outer peripheral surface of the opening and the cover 11 is fixed. Reference numeral 14 is a hinge in which one piece is fixed to the leg 3 and the other is fixed to the cover 11. Reference numeral 15 is a mounting guide plate for the dust collecting box 10 fixed to the upper surface of the base 4 of the leg, and positioning pieces 15A and 15B in the front-rear and left-right directions are formed upward. Thus, 16 is a foot switch for operating the sewing machine, 16A is a (low speed pedal) and 16B is a (high speed pedal).

Next, the electric circuit of the blower motor 6 will be described. In FIG. 2, 16A and 16B are the low-speed and high-speed switches, respectively, which are connected to a CPU (central processing unit) 19 which constitutes a control circuit via integrating circuits 17 and 18, respectively. The integration circuits 17 and 18 are for preventing chattering that occurs when the contacts of the low speed and high speed switches 16A and 16B are turned on and off. That is, when the low speed switch 16A is depressed, the contacts are closed (ON), the CPU 19 outputs a low speed signal to the motor drive circuit 20, and the sewing machine motor 21 rotates at a low speed. Similarly, when the high-speed switch 16B is depressed, the contacts are turned on, the CPU 19 outputs a high-speed signal to the drive circuit 20, and the sewing machine motor 21 rotates at high speed. Reference numeral 22 is a thread breakage detection unit that outputs a detection signal for stopping the rotation of the sewing machine when there is no thread, and 23 is a sewing machine rotation detection unit.
The sewing machine rotation detecting section 23 generates a signal according to the rotation of the sewing machine, and the CPU 19 outputs a rotation output H signal to the switching circuit 24 while this signal is being output.

The switching circuit 24 outputs a rotation signal to the solid state relay 30 in response to the input of the H signal. Then, the solid state relay 30 supplies electric power to the blower motor 6 by the rotation signal input, and the blower motor 6 rotates. Reference numeral 31 is a spark killer, which absorbs surge voltage generated when the power supply to the blower motor 6 is turned on and off. (Note that in the figure, 25 and 26 are resistors, 27 and 29 are transistors, respectively [NPN type] and [PNP type],
32 shows the electric wire of the blower motor).

The switching circuit 24 is an integrating circuit as shown in the figure.
The time constant t is determined by the constants of the resistor 28A and the capacitor 28B, and the output of the switching circuit 24 outputs the rotation signal longer than the rotation output H signal by the time constant t (see FIG. 3). .

By having this integrating circuit 28, the blower motor is additionally rotated for a fixed time t even when the sewing machine operation is completed. This helps to completely suck in lint and cloth waste without any residue.

Further, by changing the resistance 28 to a variable resistance and changing the resistance value, it is possible to arbitrarily adjust the constant time point t and set the optimum time point for sucking the yarn waste and cloth waste. When the upper thread or the lower thread runs out, the thread breakage detection unit 22 outputs a detection signal to stop the rotation of the sewing machine, the sewing machine stops, and the electrode supply to the blower motor stops, and this rotation also stops. It

[Effect of device]

(1) Even in a machine having a plurality of switches for operating the sewing machine, the configuration can be simplified with one switching circuit.

(2) When the sewing machine is stopped due to thread breakage or the like during the operation of the sewing machine, the blower motor stops and the motor does not rotate when unnecessary, so that the state is stable and economical.

(3) Since the blower motor is rotated for a certain period of time even after the sewing machine operation is completed by incorporating the integrating circuit, the yarn waste and the cloth waste can be completely sucked.

[Brief description of drawings]

Fig. 1 is an external view of a sewing machine equipped with the device of the present invention.
Each of FIG. 4 is a diagram of an electric circuit, a timing chart and a flow chart of the present invention. 6 ... Blower motor, 7-9 ... Suction tube, 10 ... Dust collection box, 16A ... Low speed switch, 16B ... High speed switch, 19 ... CPU (central processing unit), 21 ... Sewing machine motor, 22 ...... Thread breakage detector, 23 ...... Sewing machine rotation detector, 24 ...... Switching circuit, 28 ...... Integrator circuit.

Claims (2)

[Scope of utility model registration request] Claims: 1. A blower motor and a switching circuit for rotating the blower motor, wherein the blower motor is rotated to rotate the sewing machine motor, thereby causing thread waste or cloth waste generated during sewing work of the sewing machine. In the dust collecting device of the sewing machine that sucks the etc. into the dust collecting box from the generation unit, the sewing machine rotation detection unit that detects the rotation of the sewing machine motor and the sewing machine rotation detection unit when the sewing machine motor is rotating are output. And a control circuit for controlling the switching circuit so that the blower motor is rotated by outputting a rotation output signal to the switching circuit in response to the signal. 2. The dust collecting machine according to claim 1, wherein the switching circuit has a built-in integrating circuit and outputs a rotation signal so as to rotate the blower motor longer than the rotation output signal for a predetermined time. apparatus.