CN115224881A - Rotary axis sensing device of sewing machine motor - Google Patents

Abstract

The invention relates to a rotating shaft sensing device of a sewing machine motor, which comprises a magnet rotating disc, a first IC plate and a second IC plate, wherein the magnet rotating disc magnetizes an inner ring magnetic area, an outer ring magnetic area and an upper positioning magnetic area; the second IC board senses the rotation of the magnet turntable to capture the rotation of the rotating shaft, senses the upper positioning magnetic area and outputs an upper positioning pulse signal to control the stop position of the upper positioning needle of the sewing machine.

Description

Rotary axis sensing device of sewing machine motor

technical field

The present invention relates to a sensing device for a motor rotating shaft to accurately monitor the running state of the motor rotating shaft, in particular to a rotating shaft sensing device for a sewing machine motor.

Background technique

The current sewing machine encoders can be roughly divided into two types: contact type and non-contact type according to their sensing methods. Contact encoders have the problem of wear and tear of parts. In order to avoid contact wear, relevant manufacturers have developed non-contact encoders, such as optical encoders and magnetic encoders.

Please refer to Taiwan's New Patent No. M302831 "Servo Motor Encoder", the encoder in this case is an optical encoder. The servo motor encoder includes a light-shielding sheet and a sensing device. The light-shielding sheet is a circular body and is used to connect to the rear end of the axis of the servo motor. The outer ring or the inner ring is concave with several grooves at equal intervals. A plurality of light-transmitting holes are arranged on the inner or outer concentric rings. The sensing device is provided with a base which is combined with the rear surface of the servo motor. And around the plug body of the light-shielding sheet, three photo interrupters for detecting missing grooves and an optical encoder module for detecting each light-transmitting hole are combined around the plug body; The photo-interrupter and the photo-coding module detect the position and action of the light-shielding plate, and output the information code for detecting and controlling the action of the servo motor.

The aforementioned optical encoders are rotary optical encoders commonly used in sewing machines in the industry. However, the sewing machine operates by sewing fabrics, so many broken threads or lint will be generated during the sewing process. Broken thread or lint will adhere to the perforations of the bottom plate and the light-transmitting holes of the light shield, which will affect the detection accuracy of the photo-interrupter, and thus lead to the timing error of the sewing machine and cannot operate normally.

In addition, among non-contact encoders, magnetic encoders also have the advantage of overcoming the wear and tear of contact encoder components. They are used to convert the mechanical rotation angle of the shaft into digital or analog signals to realize signals such as angle, linear displacement, and rotational speed. Compared with the rotary optical encoder, the output does not have the problem of affecting the accuracy of its sensing when used in harsh working environments such as oily or dusty (or broken threads or cotton wool in the aforementioned sewing machine). The application of the magnetic encoder to the sewing machine will solve the problems encountered by the aforementioned optical encoder.

For the magnetic encoder, please refer to the patent No. CN203645456U of "Synchronization Device of Sewing Machine Direct Drive Motor and Magnetic Encoder", which is about a device for synchronization of sewing machine direct drive motor and magnetic encoder. The main technical means are The output shaft of the motor is sleeved with a transmission gear, and a mounting seat is additionally assembled on the casing of the motor to install an additional shaft, and a driven gear is sleeved on the shaft. The transmission gear and the driven gear A transmission belt is meshed together, and then a magnetic element is placed on the shaft, and a corresponding sensor is arranged in the path through which the magnetic element passes. The transmission relationship between the moving gears rotates synchronously, and the magnetic element can also rotate with the shaft. At this time, the sensor can measure the required data according to the magnetic field change of the rotating magnetic element, in other words Most of the existing technologies are similar to this kind of hanging a transmission mechanism on the output shaft to show the rotation state on another driven shaft, and then use the shaft to drive the magnetic element to rotate to monitor and control, generate code.

However, this kind of technical means of adding a hanging transmission mechanism to drive an additional shaft is prone to unnecessary loss of output and transmission loss, belt wear and dust, belt transmission slippage, belt wear caused transmission gap, and belt contact position is easy to be stressed on one side. It will cause many problems such as rotational resonance, etc., which will lead to the problem of detection distortion. Furthermore, it will also take up too much space for the motor configuration, affect heat dissipation, etc., and the magnetic components cannot directly perform physical level adjustment. Positioning deviation correction and adjustment must be done by electronic parameter setting. It is also difficult for those who are not familiar with the control function to get started, and it is prone to setting errors, which affects the product yield. In view of this, the rotation axis of the sewing machine motor feels Optimizing and improving the measuring device is the focus of the present invention.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a method for directly sensing the rotating shaft of the motor of the sewing machine by using the dual-sensing IC board, so that the operation of the sewing machine is more accurate and the production efficiency and yield are improved.

In order to achieve the above-mentioned purpose, the technical means implemented by the present invention include: a magnet turntable, which is sleeved into a ring groove fixed on the rotating shaft with a central circular hole, so that the magnet turntable rotates synchronously with the rotating shaft, and the magnet turntable is fully charged. Magnetically has an inner ring magnetic area and an outer ring magnetic area; a first IC board is fixed on the back cover for sensing the inner ring magnetic area and the outer ring magnetic area to output R, S, T pulse signals and The pulse signals of A and B are output; since the magnet turntable is directly fixed on the rotating shaft and rotates synchronously with the rotating shaft, the absolute position of the rotating shaft can be sensed, so that the generated signal is not distorted.

The sensing device further includes a second IC board fixed on the back cover, and the magnet turntable is provided with an upper positioning magnetic region between the inner magnetic region and the outer magnetic region for the second IC board Corresponding to the sensing, the upper positioning pulse signal is output, and the motor operation is controlled by the pulse signal output by the first IC board.

The sensing device is provided with a positioning mechanism on the back cover, the positioning mechanism is fixed with a second IC board, and the magnet turntable is provided with an upper positioning magnetic region between the inner magnetic region and the outer magnetic region, for The second IC board senses correspondingly, outputs an upper positioning pulse signal, and controls the motor to operate in conjunction with the pulse signal output by the first IC board.

The back cover is provided with at least one first stud for fixing the first IC board, and the positioning mechanism is provided with a first opening corresponding to the first stud for the first stud to pass through; the positioning mechanism The peripheral edge of the mechanism has a plurality of lugs, and an adjustment hole for locking is penetrated at each lug. When loosening, the positioning mechanism can be rotated to adjust the relative position of the second IC board and the upper positioning magnetic area, and The first stud is rotated relative to the first stud; the positioning mechanism has a boss, and a groove is formed between the boss and each of the bosses, so that a turntable cover can be inserted into the groove.

The peripheral edge of the positioning mechanism has a plurality of lugs, and an adjustment hole for locking is penetrated through each lug. When loosening, the positioning mechanism can be rotated to adjust the second IC board and the upper positioning magnetic area. The positioning mechanism has a boss, and a groove is formed between the boss and each of the lugs, so that a turntable cover can be inserted into the groove.

The sensing device further includes a turntable cover, which is sleeved inside the annular groove of the rotating shaft and fixed on the rear cover to cover the magnet turntable and the outside of the first IC board.

The sensing device further includes a turntable cover, the turntable cover is disposed on the outside of the magnet turntable and the first and second IC boards and is fixed on the rear cover.

The inner ring magnetic area of the magnet turntable is magnetized with at least 4 poles arranged according to the polarity, so as to be sensed by the first IC board.

The outer ring magnetic area of the magnet turntable is arranged and magnetized according to the polarity to have 2 times the number of poles for sensing by the first IC board; the number of poles of the outer ring magnetic area is 60 poles.

The upper positioning magnetic area of the magnet turntable is magnetized with three poles, which are arranged according to one of NSN polarity or SNS polarity, for the second IC board to sense.

The magnet turntable is provided with a lower positioning magnetic region at a position where the upper positioning magnetic region is opposite to 180 degrees, so that the second IC board can sense the lower positioning magnetic region correspondingly, so as to output a lower positioning pulse signal to control the lower positioning needle of the sewing machine. stop position; the magnet turntable further includes a pole-free area, the height of the pole-free area is less than the height of the lower positioning magnetic area; the height of the pole-free area is reduced between 0.2 and 0.6mm; the reduced height of the pole-free area is 0.4mm .

The magnet turntable further includes a pole-free area, and the height of the pole-free area is smaller than the heights of the inner ring magnetic area, the outer ring magnetic area and the upper positioning magnetic area; the height of the magnetic pole area is reduced by 0.2 to 0.6 mm; the The reduced height of the pole-free area is 0.4mm.

The material of the magnet turntable is plastic material and iron oxide magnet.

The sensing device further includes a hand wheel fixed on the rotating shaft.

Description of drawings

Fig. 1 is the combined perspective schematic diagram of the preferred embodiment of the present invention;

Fig. 2 is the exploded schematic diagram of the preferred embodiment of the present invention;

Fig. 3 is the detailed exploded schematic diagram of the preferred embodiment of the present invention;

4 is a schematic diagram of a magnetic region of a magnet turntable in a preferred embodiment of the present invention;

4A is another schematic diagram of the magnetic region of the magnet turntable in the preferred embodiment of the present invention;

5 is a schematic cross-sectional view of a preferred embodiment of the present invention;

Fig. 6 is the schematic diagram before rotation of the positioning mechanism in the preferred embodiment of the present invention;

6A is a schematic diagram of the positioning mechanism after rotation in a preferred embodiment of the present invention;

FIG. 7 is a schematic diagram of using the first IC board in the preferred embodiment of the present invention alone.

Detailed ways

Please refer to FIG. 1 to FIG. 3 , which are schematic diagrams of a preferred embodiment of the present invention. The sensing device of the present invention is correspondingly disposed at the position of the rotating shaft 11 of the motor 10 , and includes a magnet turntable 20 and a first IC board 30 , a second IC board 40 , a positioning mechanism 50 and a turntable cover 60 .

As shown in FIG. 3 , the motor 10 is provided with a first stud 121 on the rear cover 12 , and the positioning mechanism 50 has a boss 51 with a smaller area than the main body and a central hole 52 penetrating through it on one side of the main body of the positioning mechanism 50 . A first opening 53 is preset at the position of the post 121 for the first stud 121 to pass through. The number of the first studs 121 can also be increased or decreased under the premise that the first IC board 30 can be locked.

The positioning mechanism 50 also has a plurality of lugs 54 extending outward from the periphery of the body, so that a groove 55 is formed between the boss 51 and the lugs 54, as shown in FIG. Arc-shaped adjustment hole 541 . In this embodiment, the positioning mechanism 50 has three lugs 54, which can also be increased or decreased as required.

During assembly, the positioning mechanism 50 is inserted into the rotating shaft 11 through the central hole 52 , and the first stud 121 is inserted through the first opening 53 , and finally the screw 56 is passed through the adjustment hole 541 to fix the positioning mechanism 50 on the rear cover 12 .

The first IC board 30 is fixed on the first stud 121 passing through the first opening 53 with the screw 31 , and the second IC board 40 is locked on the second stud 57 of the positioning mechanism 50 with the screw 41 .

The positioning mechanism 50 in this embodiment has a pair of second studs 57 for locking the second IC board 40 . When necessary, the position of the second studs 57 can also be changed, or as shown in FIG. 3 . , the second studs 57 are provided at different angles in advance for optional use. On the premise that the second IC board 40 can be locked, the number of the second studs 57 can also be increased or decreased.

The magnet turntable 20 has a disc-shaped body and a flange 21 is formed on the body to surround the central circular hole 211 . The magnet turntable 20 in this embodiment is made of plastic material and iron oxide magnet, but the material is not limited to these.

During assembly, one side of the magnet turntable 20 and the gap adjusting piece 22 are inserted into the rotating shaft 11 together, and then the C-shaped retaining ring 23 is correspondingly fastened to the ring groove 111 of the rotating shaft 11 to be fixed on the rotating shaft 11 as shown in FIG. 5 . On the other side, there is a flange 21 for the turntable cover 60 to be inserted into, so that the magnet turntable 20 is clamped between the ring groove 111 of the rotating shaft 11 and the turntable cover 60 .

After the turntable cover 60 is inserted into the rotating shaft 11 , the magnet turntable 20 , the positioning mechanism 50 , the second IC board 40 on the second stud 57 , and the first IC on the first stud 121 passing through the positioning mechanism 50 can be inserted into the turntable cover 60 . As shown in FIG. 5 , the plates 30 are all sheathed in the accommodating space formed together with the positioning mechanism 50 , and the turntable cover 60 can be correspondingly embedded in the groove 55 between the boss 51 and the lug 54 , and then screw 61 It is locked on the back cover 12 .

As shown in FIG. 4 , the magnet turntable 20 is magnetized with an inner ring magnetic area 201 , an outer ring magnetic area 202 and an upper positioning magnetic area 203 . At the outer ring around the central circular hole 211 of the magnet turntable 20 , the upper positioning magnetic area 203 is relatively located between the inner ring magnetic area 201 and the outer ring magnetic area 202 .

The inner ring magnetic area 201 is equally divided as shown in the figure and magnetized with at least 4 poles arranged according to the NSNS polarity. The number of poles; the outer ring magnetic area 202 is equally divided as shown in the figure and magnetized according to the polarity of NSNS. There are 30 pole pairs (60 poles), in fact, it can be increased in multiples of 2 poles (NS) according to the needs; the upper positioning magnetic area 203 is shown in the figure The shown magnetization has 3 poles arranged according to the polarity of NSN. Actually, according to the different sensing devices, the polarity arrangement of SNS can be selected.

The first IC board 30 is fixed on the first stud 121 passing through the positioning mechanism 50 , and is relatively positioned between the magnet turntable 20 and the positioning mechanism 50 for correspondingly sensing the inner ring magnetic region 201 and the outer ring of the magnet turntable 20 . Magnetic region 202 .

The first IC board 30 cooperates with the inner ring magnetic area 201 of the magnet turntable 20 for detection by using the magnetic principle to output pulse signals of R, S and T, and also cooperates with the outer ring magnetic area 202 of the magnet turntable 20 for detection by using the magnetic principle. to output the pulse signals of A and B.

The sensing device uses the first IC board 30 to output the pulse signals of R, S, T and the pulse signals of A and B, and transmit the signals to the controller for processing (not shown in the figure) by electrical connection, as the motor drive control, for example Detecting the rotation direction, speed, etc. of the rotating shaft 11 can obtain the best control effect.

The second IC board 40 is fixed on the second studs 57 with screws 41 , and is relatively positioned on the magnet turntable 20 and the positioning mechanism 50 , for correspondingly sensing the positioning magnetic region 203 on the magnet turntable 20 .

The second IC board 40 cooperates with the upper positioning magnetic region 203 of the magnet turntable 20 to detect by magnetic principle induction, so as to output the upper positioning pulse signal, and then transmit the upper positioning pulse signal to the controller for processing (not shown in the figure) through the electrical connection, It is used as the upper positioning needle stop position for controlling the sewing machine.

According to operational requirements, a set of 3-pole lower positioning magnetic regions 204 can be set at the position where the upper positioning magnetic region 203 is opposed to 180 degrees, as shown in FIG. SNS polarity arrangement, corresponding to the lower positioning position of the motor. The second IC board 40 cooperates with the lower positioning magnetic area 204 to sense and detect by magnetic principle, so as to output the lower positioning pulse signal, which is used to control the stop position of the lower positioning needle of the sewing machine.

In order to avoid the phenomenon of magnetic interference during magnetization, the height of the inner ring magnetic region 201, the outer ring magnetic region 202 and the non-magnetic region 205 other than the upper positioning magnetic region 203 or the lower positioning magnetic region 204 in FIG. The ring magnetic region 202, and the upper positioning magnetic region 203 or the lower positioning magnetic region 204 are low. The height reduction range of the non-magnetic pole region 205 is between 0.2 mm and 0.6 mm, and the best is 0.4 mm.

The second IC board 40 can also loosen the screws 56 originally locked in the adjustment holes 541 as shown in FIG. 6 , and then directly rotate and move the positioning mechanism 50 as shown in FIG. 6A to adjust the second studs. The position of the second IC board 40 on 57 is adjusted to adjust the relative position of the second IC board 40 and the upper positioning magnetic area 203, and the upper positioning point is fine-tuned, which is convenient for unfamiliar operators to make adjustments. According to actual requirements, the second stud 57 can also be directly disposed on the back cover 12 at an appropriate position to cooperate with the magnet turntable 20 for detection, and the adjustment function is omitted.

During adjustment, the diameter and shape of the first opening 53 through which the first stud 121 passes through the positioning mechanism 50 and the diameter and shape of the adjustment hole 541 can be matched with each other as shown in FIG. 6A . The first stud 121 is maintained in a protruding structure, so that the positioning mechanism 50 can rotate relative to the first stud 121 through the first opening 53 without affecting the rotation of the positioning mechanism 50 . Under the premise of not affecting the rotation of the positioning mechanism 50 , the position of the first stud 121 , the fixed structure of the first IC board 30 , and the shape of the positioning mechanism 50 body can also be selectively changed accordingly.

The first IC board 30 in this embodiment can also be used alone with the magnet turntable 20 . When the first IC board 30 is used alone, as shown in FIG. 7 , the first IC board 30 can be directly locked on the first studs 121 on the back cover 12 , and output pulse signals in cooperation with the corresponding magnetic areas of the magnet turntable 20 , and add a pulse signal. Another external positioning signal device is provided to control the operation of the motor 10 .

In the present invention, as shown in FIG. 5 , a hand wheel 70 can be optionally added, and the hand wheel 70 is directly fixed on the rotating shaft 11 , so that the hand wheel 70 can directly drive the rotating shaft 11 , and the magnet turntable 20 can also be synchronously sensed. The rotation state of the handwheel 70; a heat shield (not shown in the figure) can also be added to cover the outside of the motor 10 for heat insulation.

In the present invention, since the magnet turntable 20 is directly arranged on the rotating shaft 11 and rotates synchronously with the rotating shaft 11, the generated induction signal is obtained from the absolute position, and the signal will not be distorted, and since all values are directly captured from the rotating shaft 11. Therefore, compared with the general indirect acquisition method, it can generate more accurate and undistorted signals, and more absolute monitoring and control values, so that the operation of the sewing machine motor can obtain the best control effect.

Because the present invention uses magnetic induction to control motor drive and positioning, it is not afraid of oil and gas or water vapor pollution, as well as the covering of cotton wool and dust, so that the operation of the sewing machine motor can obtain the best control effect.

The above-mentioned embodiments are intended to illustrate the preferred and possible implementation modes of the present invention, and are not intended to limit the patent scope of the present invention. Any replacements shall fall within the scope of the patent application of the present invention.

Claims (22)

1. A rotary shaft sensing device of a sewing machine motor, which is used for being installed in cooperation with a motor having a rotary shaft on a front cover thereof, is characterized in that the sensing device comprises:

a magnet rotary disc, which is sleeved in a ring groove fixed on the rotating shaft by a central round hole, so that the magnet rotary disc synchronously rotates along with the rotating shaft, and the magnet rotary disc is magnetized with an inner ring magnetic area and an outer ring magnetic area;

a first IC board fixed on the back cover for sensing the inner ring magnetic area and the outer ring magnetic area to output the pulse signals of R, S and T and the pulse signals of A and B;

because the magnet turntable is directly fixed on the rotating shaft and synchronously rotates along with the rotating shaft, the absolute position of the rotating shaft can be sensed, and the generated signal is not distorted.

2. The rotating shaft sensing device of a sewing machine motor according to claim 1, characterized in that: the sensing device further comprises a second IC board fixedly arranged on the rear cover, and the magnet turntable is provided with an upper positioning sector between the inner ring magnetic area and the outer ring magnetic area so as to allow the second IC board to correspondingly sense and output an upper positioning pulse signal, and the motor is controlled to operate by matching with the pulse signal output by the first IC board.

3. The rotating shaft sensing device of sewing machine motor according to claim 1, characterized in that: the sensing device is provided with a positioning mechanism on the rear cover, the positioning mechanism is fixedly provided with a second IC board, and the magnet turntable is provided with an upper positioning magnetic area between the inner ring magnetic area and the outer ring magnetic area for the second IC board to correspondingly sense and output an upper positioning pulse signal and cooperate with the pulse signal output by the first IC board to control the motor to operate.

4. The rotating shaft sensing device of a sewing machine motor according to claim 3, characterized in that: the rear cover is provided with at least one first stud for fixing the first IC board, and the positioning mechanism is provided with a first opening corresponding to the first stud for the first stud to penetrate out.

5. The rotating shaft sensing device of a sewing machine motor according to claim 4, characterized in that: the periphery of the positioning mechanism is provided with a plurality of lugs, and an adjusting hole for locking is arranged at each lug in a penetrating way, so that the positioning mechanism can be rotated when being loosened, the relative position of the second IC board and the upper positioning magnetic area is adjusted, and the first opening is rotated relative to the first stud.

6. The rotating shaft sensing device of sewing machine motor according to claim 3, characterized in that: the periphery of the positioning mechanism is provided with a plurality of lugs, an adjusting hole for locking is arranged at each lug in a penetrating way, and the positioning mechanism can be rotated when being loosened so as to adjust the relative position of the second IC board and the upper positioning magnetic area.

7. The rotating shaft sensing device of a sewing machine motor according to claim 5 or 6, characterized in that: the positioning mechanism has a boss, and a groove is formed between the boss and each of the lugs for a turntable cover to be inserted into the groove.

8. The rotating shaft sensing device of sewing machine motor according to claim 1, characterized in that: the sensing device further comprises a rotary disc cover which is sleeved on the inner side of the annular groove of the rotating shaft and fixed on the rear cover so as to cover the magnet rotary disc and the outer side of the first IC plate.

9. The rotating shaft sensing device of a sewing machine motor according to claim 2 or 3, wherein: the sensing device further comprises a turntable cover, wherein the turntable cover is arranged on the magnet turntable, the outer sides of the first IC board and the second IC board and fixedly arranged on the rear cover.

10. The rotating shaft sensing device of a sewing machine motor according to claim 1, characterized in that: the inner ring magnetic area of the magnet turntable is magnetized with at least 4 poles according to the polarity arrangement for the sensing of the first IC board.

11. The rotating shaft sensing device of a sewing machine motor according to claim 1, characterized in that: the outer ring magnetic area of the magnet turntable is magnetized with 2 times of pole number according to the polarity arrangement for the first IC board to sense.

12. The rotating shaft sensing device of sewing machine motor according to claim 11, characterized in that: the number of poles of the outer ring magnetic region is 60.

13. The rotating shaft sensing device of a sewing machine motor according to claim 2, characterized in that: the upper positioning magnetic area of the magnet turntable is magnetized with 3 poles, and is arranged according to one of NSN polarity or SNS polarity for the second IC board to sense.

14. The rotating shaft sensing device of a sewing machine motor according to claim 2, characterized in that: the magnet turntable is provided with a lower positioning magnetic area at the position opposite to 180 degrees of the upper positioning magnetic area, so that the second IC board can correspondingly sense the lower positioning magnetic area to output a lower positioning pulse signal and control the stop position of a lower positioning needle of the sewing machine.

15. The rotating shaft sensing device of sewing machine motor according to claim 14, characterized in that: the magnet turntable further comprises a non-magnetic pole area, and the height of the non-magnetic pole area is smaller than that of the lower positioning magnetic area.

16. The rotating shaft sensing device of a sewing machine motor according to claim 15, wherein: the height of the non-magnetic region is reduced

In between.

17. The rotating shaft sensing device of a sewing machine motor according to claim 16, wherein: the reduced height of the pole-free region was 0.4mm.

18. The rotating shaft sensing device of a sewing machine motor according to claim 2 or 3, wherein: the magnet turntable further comprises a non-magnetic pole area, and the height of the non-magnetic pole area is smaller than that of the inner ring magnetic area, the outer ring magnetic area and the upper positioning magnetic area.

19. The rotating shaft sensing device of sewing machine motor according to claim 18, characterized in that: the height of the non-magnetic region is reduced

In the meantime.

20. The rotating shaft sensing device of sewing machine motor according to claim 19, characterized in that: the reduced height of the pole-free region was 0.4mm.

21. The rotating shaft sensing device of a sewing machine motor according to claim 1, 2 or 3, characterized in that: the magnet turntable is made of plastic materials and iron oxide magnets.

22. The rotating shaft sensing device of a sewing machine motor according to claim 1, characterized in that: the sensing device further comprises a hand wheel fixed on the rotating shaft.

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