JPS61132055A - Rotation detector for clutch motor - Google Patents

Abstract

PURPOSE:To effectively synchronize the rotation of a clutch shaft with the drive of a sewing machine head by directly detecting the rotation of the clutch shaft. CONSTITUTION:When a petal is pressed, a bearing bush 16 moves in a rotor direction, a clutch lining 24 secured to a clutch shaft 4 and a flywheel 25 secured to always rotating rotor are connected to drive a sewing head through a belt 5. When a detecting plate 19 secured to the shaft 4 rotates at 1/2 revolution or more, the small piece 19' of the plate 19 passes the front of a magnetic sensor 20 to detect the rotation. A signal from the sensor 20 is fed to a control box 23 to apply a voltage to a blower motor, and a dust collector is driven. Thus, the rotation of the shaft 4 can be effectively synchronized with the drive of the head by directly detecting the rotation of the shaft 4.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is an industrial sewing machine mainly used for sewing purposes. Regarding the clutch motor for driving, it is especially necessary to drive the sewing machine and also have other functions such as a clutch motor with a dust collector combined with a dust collector that sucks up fabric scraps and thread waste cut during sewing. This invention relates to a device for detecting the rotation of a clutch shaft of a clutch motor.

Conventional configurations and their problems In recent years, clutch motors used in industrial sewing machines are not only used to simply drive the sewing machine, but also to perform various sewing functions in conjunction with the sewing machine drive, or to connect other equipment. Control and operation functions are also required. Among these, a clutch motor with a dust collector that sucks up fabric scraps and thread scraps that are cut at the same time as thread sewing is required to have a synchronized operation function that operates the dust collector in conjunction with the drive of the sewing machine as described above.

The clutch motor is attached to the sewing machine table on which the sewing machine head is placed, and when the sewing worker steps on the pedal, the lever of the clutch motor, which is connected to the pitman rod, is pulled down, which causes the clutch motor to constantly rotate with the clutch shaft. The rotor is connected and the sewing machine head is driven to perform sewing. A clutch motor with a dust collector has a synchronized operation structure in which the dust collector is operated at the same time when the sewing machine head is driven. There were many structures in which the dust collector was operated at the same time as the lever was moved. As described above, as a method of synchronizing the drive of the sewing machine head, a method of detecting the movement of the lever of the clutch motor has often been used.

Hereinafter, with reference to the drawings, a clutch motor rotation detection device that has been conventionally used as a method necessary for synchronized operation with the sewing machine head as described above will be described. - Fig. 4 shows a clutch motor with a dust collector equipped with a conventional clutch motor rotation detection device, and only a portion thereof is shown.

In FIG. 4, reference numeral 1 denotes a clutch motor body, which is attached to a sewing machine table 3 on which a sewing machine head 2 is placed. A clutch shaft 4 drives the sewing machine head 2 via a belt 5.

6 is a bevel, and the lever 8 is connected via the pitman rod 7.
is connected to. 9 is a blower motor, and dust collector section 10
installed on. This dust collector section 10 is fixed to the clutch motor main body 1 via a cover 11. Reference numeral 12 denotes a suction hose that connects the sewing machine table 3 and the dust collector section 10 to suck in cloth and thread waste. A stator winding 13 is located in the clutch motor body 1 and generates a magnetic field for rotating a rotor (not shown), but at the same time supplies voltage to the blower motor 9. Reference numeral 14 denotes a microswitch, which is connected between the stator winding 13 and the blower motor 9. This microswitch 14 is also fixed to the lever 8, and changes the voltage applied to the blower motor 9 to 0N according to the movement of the lever 8. -OFF control.

The operation of the clutch motor with dust collector configured as above will be explained below.

Although the rotor of the clutch motor main body 1 is constantly rotating,
When the sewing worker depresses the pedal 6 with his/her foot, the lever 8 is pulled down, and the clutch shaft 4 and the rotor are thereby connected to drive the sewing machine head 2ft via the belt 5. At this time, the microswitch 14 is turned on at the same time as the lever 8 moves, and voltage is applied from the stator winding 13 to the blower motor 9, and the blower motor 9 is driven to suck cloth and thread waste from the hose 12 into the dust collector section 10. Inhale to.

Further, the sucked air passes through the blower motor 9 and flows into the clutch motor main body 1 or outside through a wind window provided in the cover 11. In this way, when the operator steps on the pedal 6 with his/her foot, the lever 8 moves, the clutch shaft 4 rotates, and the sewing machine head 2 is driven.
Since it directly detects the rotation of the clutch shaft, lever 8
The movement of the blower motor 9 is detected and the microswitch 14 is used to turn on and off the voltage to the blower motor 9, thereby operating the blower motor 9 in synchronization with the sewing machine head 2.

However, with the above configuration, if the clutch motor is used for a long time, the clutch lining (not shown) and brake lining (not shown) attached to the clutch shaft 4 will wear out, causing the initial state of use to deteriorate. Compared to this, the movable stroke and stop position of the lever 8 change considerably, which causes the microswitch 14 to malfunction.Also, since the detection method is a contact method using a microswitch, the service life is shortened. It's not long. For this reason, the conventional structure has a disadvantage in that the reliability of detecting the movement of the lever 8 and reliably synchronizing it with the driving of the sewing machine head 2 is low.

Purpose of the Invention The present invention has been made in view of the above-mentioned prior art, and uses a non-contact method in which the rotation of the clutch shaft is directly detected by a magnetic sensor or an optical sensor, thereby providing a long service life and directly detecting the rotation of the clutch shaft. Therefore, the present invention provides a highly reliable clutch motor that can be reliably synchronized with the drive of the sewing machine head.

Structure of the Invention In order to achieve this object, the clutch motor rotation detection device of the present invention has at least one small section between the ball bearing supporting the clutch shaft and the pulley fixed to the tip of the clutch shaft. The detection plate is inserted and fixed, and the rotation of the detection plate that rotates together with the clutch shaft is detected by a sensor fixed to the clutch bracket with a gap at a position facing the front surface of the small piece. .

According to this configuration, since it is a non-contact method, it has a long life.
Since the rotation of the clutch shaft is directly detected, it is possible to obtain a clutch motor rotation detection device that causes fewer malfunctions and allows highly reliable synchronized operation with the sewing machine head.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Note that the same components as those in the conventional configuration described above will be described with the same numbers.

FIG. 1 shows a clutch portion of a clutch motor using a rotation detection device according to an embodiment of the present invention, and is shown in a cross-sectional view. In Figure 1, 4 is the clutch shaft and 5 is the clutch shaft.
16 is a belt, and 16 is a ball bearing that supports the clutch shaft 4. A bearing bush 16 supports the ball bearing 15, and is held in the housing of the clutch bracket 17, and has a structure that allows it to move in the axial direction.

A pulley 18 is fixed to the tip of the clutch shaft 4 and transmits rotational force to the belt 6. 19 is a detection plate fixed to the clutch shaft 4 between the ball bearing 16 and the pulley 18;
It has two small sections 19' extending in the axial direction. A 20Fi magnetic sensor is installed in a sensor mounting base 21, and the sensor mounting base 21 is fixed to the lever support hand 17' of the clutch bracket 1 with a screw 22. Reference numeral 23 denotes a control box attached to the clutch bracket 17, which incorporates a circuit that receives signals from the magnetic sensor 20 and controls the ON/OFF state of the voltage applied to the blower motor. 24 is a clutch lining, which is fixed to the clutch shaft 4.

25 is a flywheel fixed to a rotor (not shown), and 8a is a lever.

Figures 2a and 2b are a front view and a side view, respectively, of an enlarged view of the detection plate 19 in Figure 1.

FIG. 3 shows a clutch motor with a dust collector using a clutch motor rotation detection device according to an embodiment of the present invention. In FIG. 3, reference numeral 1a denotes a clutch motor equipped with a rotation detecting device according to the present invention, and a power line is connected to a blower motor 9a attached to a dust collector 10a by a plug 26 pulled out from a control box 23. 8a is a lever. 2 is the sewing machine head, 3 is the table, 5 is the belt, 6 is the pedal, 7ij, t: 'Sotomanrono)'',
Reference numeral 12 denotes a suction hose, which has the same structure as that shown in FIG. 4.

The operation of the clutch motor rotation detection device configured as described above will be described below. When the operator depresses the pedal 6 with his/her foot, the lever 8a is pulled down, and the bearing bush 16 moves toward the rotor and is fixed to the clutch lining 24 fixed to the clutch shaft 4 and the constantly rotating rotor. A flywheel 25 is connected to drive the sewing machine head 2 via the belt 5. At this time, when the detection plate 19 fixed to the clutch shaft 4 rotates more than IA, the small piece 19' of the detection plate 19 passes through the front surface of the magnetic sensor 2o and detects the rotation. A signal from the magnetic sensor 2Q is sent to the control box 23, a voltage is applied to the blower motor 9&, and the dust collector 101L is driven. Further, when the operator removes his/her foot from the pedal 6, the clutch lining 24 separates from the seven lie wheels 25, the clutch shaft 4 is stopped by the brake lining (not shown), and the blower motor 9a is stopped.
The voltage applied to it will also be cut off. Dust collector 1o like this
2L is operated in synchronization with the driving of the sewing machine head 2.

As described above, according to this embodiment, by directly detecting the rotation of the clutch shaft 4, it is possible to reliably synchronize the drive of the sewing machine head 2, and by using the magnetic sensor 20i as a non-contact method, It has a longer service life, and rotation can be detected without problems even if the clutch lining 24 and brake lining are worn out and the movable stroke and loaf of the lever 8& and clutch shaft 4 change, providing a highly reliable synchronized operation function without malfunction. It will be done.

Although the magnetic sensor 20 is used in this embodiment, an optical sensor or other proximity sensor may also be used, and the small piece 19' of the detection plate 19 is extended in the axial direction of the clutch shaft 4. , the shape may be extended in the radial direction.

In addition, in conventional clutch motors, a slinger to prevent line entanglement is sandwiched between a pulley and a ball bearing and fixed to the clutch shaft, but the detection plate changes the shape of this slinger to completely eliminate these two functions. It can also be made into a shape.

Effects of the Invention As described above, the present invention provides a clutch motor with a dust collector, which is necessary for synchronized operation with a sewing machine head, such as a dust collector, and detects the rotation of a latch motor by sandwiching a detection plate between a pulley and a ball bearing. It is fixed to the shaft, and when the clutch shaft rotates, a detection plate passes through the front of the sensor fixed to the clutch bracket to detect the rotation, and the voltage applied to the dust collector is controlled by the signal from this sensor. By doing so, the rotation of the clutch shaft can be directly detected, and since it is a non-contact system, it has a long life, and it is possible to obtain a highly reliable synchronous operation function without malfunctions due to causes such as wear of the lining.

Furthermore, according to the present invention, the sensor and control box devices can be easily attached to a conventional clutch motor from the outside, so it can be used for clutch motors already in use on the market, and its practical The effect is huge.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a clutch portion of a clutch motor according to an embodiment of the present invention, FIGS. 2a and 2b are a front view and a side view of a detection plate in an embodiment of the present invention, and FIG. 4th block diagram of the clutch motor with dust collector according to the embodiment of
The figure is a configuration diagram of a clutch motor with a dust collector equipped with a conventional rotation detection device. 1 &... Clutch motor, 4... Clutch shaft, 9 &... Blower motor, 10 &...
... Dust collector, 15 ... Ball bearing, 16 ...
...Bearing bushing, 17...Clutch bracket, 18...Pulley, 19...Detection plate, 19'...Small piece, 2o... ...Magnetic sensor, 23...Control box. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2, Figure 19'

Claims (1)

[Claims] a ball bearing supporting the clutch shaft; a bearing bush supporting the ball bearing and movable in the axial direction of the clutch shaft within the housing of the clutch bracket; a pulley fixed to the tip of the clutch shaft; a detection plate which is sandwiched and fixed between the ball bearing and the pulley and has at least one small section; and a detection plate which is fixed to the clutch bracket with a gap at a position opposite to the front surface of the small section of the detection plate. A rotation detection device for a clutch motor, comprising a sensor, wherein the sensor detects passage of a small piece of the detection plate to detect rotation of the clutch shaft.