JP3637671B2 - Stepping motor step-out origin detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stepping motor step-out origin detecting device for detecting an origin when controlling a stepping motor.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, devices that move an article by a stepping motor (hereinafter referred to as “SM”) include devices whose SM rotation range is 360 degrees or less and devices whose rotation range exceeds 360 degrees. In general, a device whose rotation range exceeds 360 degrees is easier and more widely used to increase the movement distance of articles by SM. Further, in order to control the SM, it is necessary to grasp the origin. In the origin position detection (initialization) of the device whose SM rotation range exceeds 360 degrees, an optical non-contact sensor such as a photo interrupter is provided.
[0003]
However, the configuration in which such a sensor is provided is excellent in terms of origin detection accuracy and noise, but is inferior in terms of cost and component placement space due to an increase in the number of components, and is described in JP-A-63-302799. As shown in the figure, the moving member, which is decelerated from the SM motor shaft through the gear and moved linearly by the transmission belt, is applied directly to the stopper fixed to the frame or the like and is forcibly stopped. The origin position is the origin, and the excitation phase at the origin is the AB phase (when rotating in one direction, first the AB phase, then the BC phase, then CD → DA → AB →... Is set). Recently, many devices (step-out origin detection devices) that detect the origin with step-out are often seen.
[0004]
The moving member moved by the SM is generally decelerated by a gear. In a step-out origin detecting device with deceleration, a device that moves the moving member by 0.1 mm in one phase of SM (step angle 7.5 degrees). In this case, if the distance from the SM axis center of the tip of the protruding member attached to the SM axis is 10 mm (see FIG. 4), the distance from the protruding member tip is 1.3 mm per one phase (7.5 degrees) of the SM axis. On the other hand, on the moving member side, they are 0.1 mm and 1/13.
[0005]
[Problems to be solved by the invention]
However, as described above, when the excitation phase serving as the origin is determined and the position where the stopper hits the stopper due to the assembly error is close to the (a) -CD phase in FIG. 5 may approach the (A) -AB phase side and (B) -AB phase side in FIG. 5, and the AB phase as the origin will be different each time the origin is detected, which may hinder the movement due to SM. There is.
[0006]
In particular, when the origin is detected between movements for some reason, the apparatus cannot replace the movement target with a new movement target (or it is not desirable to replace the movement target) as described above. If the SM origin is different, the reference for movement differs before and after the origin detection, which may cause a quality problem in the movement target.
[0007]
For example, there is an embroidery sewing machine as such a device that is not exchanged for a new moving object, and it is desired to reduce the cost by detecting the origin of the SM by the above-described step-out origin detection. . In this embroidery sewing machine, a specific area is sewn with stitches to form an embroidery pattern, and the cloth is moved by the SM with respect to the sewing needle. In such an embroidery sewing machine, if trouble such as needle breakage or overload occurs, SM may step out due to the trouble, so first stop the sewing mechanism including SM and stop sewing. The origin is detected before restarting.
[0008]
At this time, if the cloth currently attached to the embroidery sewing machine is replaced with a new cloth, the embroidery is sewn from the beginning, so that the working efficiency is remarkably reduced and extra threads and cloth are wasted. Furthermore, in sewing, there are cases where the cloth to be moved is the only clothing, handkerchief, etc., and there are many cases where the cloth cannot be replaced simply because the sewing has been interrupted. Similarly, even if the cloth to be moved is a special cloth having a high unit price, it is not desirable to replace the cloth with a new cloth just because the sewing has been interrupted. In order to prevent such a problem, the embroidery sewing machine is configured so that the sewing can be resumed from the state where the embroidery is interrupted with respect to the cloth sewn halfway without changing the cloth.
[0009]
However, if the out-of-step origin detection device as described above is employed in an embroidery sewing machine and the origin differs due to the origin detection, the origin of the embroidery pattern and the like is up to 4 phases in both X and Y directions (0 on the pattern). .4 × route 2 = 0.57 mm). Since the thickness of a typical thread for embroidery is about 0.1 mm, a gap of 0.57 mm on the pattern will cause large discontinuities in the embroidery pattern and exposure of the groundwork, resulting in a fatal hindrance to the quality of the sewing product. I will give you.
[0010]
Therefore, in an apparatus for detecting the origin by stepping out the SM including the embroidery sewing machine, a moving member that is moved by the SM so that the origin always becomes a constant AB phase ((A) -AB phase in FIG. 5). When the assembly of parts such as a stopper that abuts the member is precisely adjusted and stepped out to detect the origin (the moving member abuts the stopper), the SM axis is shown in FIG. It is necessary to assemble so that it stops between the three phases from (W) -D and (I) -A) to (I) -BC phase. When the assembly adjustment is performed between the moving member and the stopper, the adjustment must be performed in units of 0.1 mm / phase (0.3 mm for three phases) corresponding to one pulse on the moving side. This is an extremely difficult adjustment considering the deflection of the stopper parts and the play, gap, and deflection of the transmission parts (gear, belt, etc.) that transmit the output from the drive source (SM) to the moving member. If parts having high rigidity and high accuracy are used, there is a problem that the cost is significantly higher than the apparatus provided with the optical non-contact sensor described above, and it takes much time and the working efficiency is low.
[0011]
The present invention has been made to solve the above-described problems, and an object thereof is to provide an inexpensive step-out motor detection device for a stepping motor.
[0012]
[Means for Solving the Problems]
In order to solve the above-described problems, the stepping motor step-out origin detecting device of the present invention has a rotating body attached to rotate integrally with the rotating shaft of the stepping motor, and approaches the rotating body by the rotation of the stepping motor. And a movable member that comes into contact with the rotating body when the phase corresponding to the origin of the stepping motor is excited, and the stepping motor steps out due to the contact between the rotating body and the moving member. The origin of is constant.
[0013]
The stepping motor out-of-step detection apparatus according to claim 2 includes a rotating body including a gear portion and a contacted portion that contacts the moving member, and a moving member that is moved by an operating member that operates by being decelerated by the gear. It has. Therefore, even if an assembly error or low component accuracy occurs in the mechanism for decelerating, the origin of the stepping motor becomes constant due to the contact between the rotating body and the moving member.
[0014]
A stepping motor out-of-step origin detecting device according to claim 3 includes a moving member which is a part of a cloth moving unit for moving a work cloth with respect to a sewing needle, and regardless of detecting an origin during sewing, The origin of the stepping motor becomes constant by contact with the moving member.
[0015]
5. A stepping motor out-of-step origin detecting device according to claim 4, wherein the stepping motor has a rotating body attached so as to rotate integrally with a rotating shaft of the stepping motor, and can be moved closer to and away from the rotating body by the rotation of the stepping motor. A moving member that contacts the rotating body when the phase corresponding to the origin of the motor is excited, and a control unit that controls the stepping motor to move the moving member closer to the rotating body beyond a moving range with respect to the sewing mechanism. ing. Accordingly, the stepping motor steps out due to contact between the rotating body and the moving member at a position beyond the moving range with respect to the sewing mechanism, and the origin of the stepping motor becomes constant.
[0016]
The step-out origin detecting device for a stepping motor according to claim 5 controls to reduce the moving speed of the moving member to the rotating body before stopping the excitation to the stepping motor after contact between the rotating body and the moving member. Control means are provided. Therefore, upon contact between the rotating body and the moving member, the excitation of the stepping motor is weakened, and the contact between the rotating body and the moving member is stabilized.
[0017]
According to a sixth aspect of the present invention, there is provided a stepping motor out-of-step detecting apparatus including a control means for controlling the moving member so as to move a distance exceeding a maximum separation distance between the rotating body and the moving member. Therefore, even if the distance between the rotating body and the moving member exceeds a preset maximum separation distance, the rotating body and the moving member come into contact with each other.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, as shown in FIG. 1, a case where the embodiment of the present invention is adopted in a cloth moving unit that moves a cloth back and forth and right and left with respect to a sewing needle of a sewing machine body will be described.
[0019]
The mechanical structure of the sewing machine body is a general structure. The sewing needle is moved up and down via the main shaft by the sewing machine motor, and the feed dog is moved up and down and back and forth in synchronization with the vertical movement of the sewing needle. The amount of feed dog adjustment is adjusted by the motor. When the cloth moving unit is mounted on the sewing machine body, the feed dog is suspended by the drop feed mechanism, and the cloth moving unit moves the cloth in synchronization with the sewing needle instead of the feed dog. A detailed description of the mechanical configuration of the sewing machine is omitted.
[0020]
As shown in FIG. 2, a sewing machine motor, a feed dog stepping motor, and the like are configured to be controlled by a CPU, which is a control device of the sewing machine body, according to a program stored in a ROM, which is an internal storage device. The cloth moving unit is configured to be controlled by the CPU of the sewing machine body when it is detachably attached to the sewing machine body. Data for controlling the sewing machine main body and the cloth moving unit is stored in a ROM inside the sewing machine or a ROM card as an external storage device.
[0021]
In particular, data for forming an embroidery pattern is configured to be supplied to the sewing machine main body by a ROM card that is detachable from the sewing machine main body. During sewing, data is sequentially read from the ROM card to the CPU, and the CPU controls various stepping motors based on the ROM card and ROM data inside the sewing machine main body. Pulses corresponding to the distances indicated by these data are supplied to the stepping motor every unit pulse number P at regular intervals (interval t1, t2: t1 <t2).
[0022]
Next, an X-direction moving mechanism for moving the cloth of the cloth moving unit in the left-right direction of the sewing machine body will be described.
[0023]
As shown in FIGS. 3, 6, and 7, the X guide shaft 15 is fixed to the X frame 13 so that its axis extends in the left-right direction when mounted on the sewing machine body. An X carriage portion 17 is slidably supported on the X guide shaft 15. The X carriage section 17 is provided with an X belt fly 19, an X slider 21, and a Y moving unit 23 described later. The X carriage section 17 is stepped for X movement through a timing belt 25 and an X moving gear pulley 27. It is configured to be moved by a motor (hereinafter referred to as XSM) 29. By moving the X carriage portion 17 along the axial direction of the X guide shaft 15, the embroidery frame 31 detachably attached to the Y moving unit 23 is moved to an arbitrary position in the X direction (the horizontal direction of the sewing machine body). can do. The X slider 21 holds the X frame 13 so as to be slidable only in the axial direction of the X guide shaft 15 so that the Y moving unit 23 and the X carriage portion 17 do not rotate about the X guide shaft 15.
[0024]
An XSM projection 33a is formed on the XSM gear 33 fixed to the XSM shaft 29a. Note that the XSM protrusion 33a, the XSM gear 33b (and the gear 27b of the X moving gear pulley 27), and the pulley of the X moving gear pulley 27 are arranged from the top of FIG. The parts 27a (and the timing belt 25 and the tension pulley 35) are arranged in this order.
[0025]
As for the number of teeth of each gear and the gear ratio, the number of teeth of the XSM gear 33b is 14, the number of teeth of the gear portion 27b of the X moving gear pulley 27 is 105, and the circular diameter of the pulley portion 27a is 11.46 mm (= tension). When the XSM shaft 29a is rotated by 7.5 degrees, that is, by one phase at the pulley diameter), the X belt oscillator 19 moves by a distance of 7.5 × (14/105) × 11.46 × π / 360 = 0.1 mm. It is configured as follows.
[0026]
As shown in FIG. 5, when the XSM 29 is excited in the AB phase (A), the XSM gear 33 is press-fitted and fixed to the XSM shaft 29a so that the XSM projection 33a is positioned at the stop angle shown in FIG. 13 is assembled. At this time, there is a gap of 3 mm between the right fitting portion 17 b of the X carriage portion 17 and the right end of the X guide shaft 15, and an X carriage protrusion formed on the right before the X carriage portion 17. The X belt spring 19 and the X carriage portion 17 are assembled with screws so that 17a just contacts the XSM protrusion 33a.
[0027]
As shown in FIG. 8, before the XSM shaft 29a makes one rotation from the position where the X carriage projection 17a and the XSM projection 33a abut, both the projections 17a and 33a can move without interference. The distance from the center of the XSM shaft 29a at the tip of the XSM protrusion 33a and the position of the X carriage protrusion 17a are set. Thus, the XSM 29 can be rotated a plurality of times. That is, it can rotate 360 degrees or more. Both protrusions 17a and 33b are configured to be moved or rotated by the same XSM 29.
[0028]
The width of the portion where the X carriage portion 17 is fitted to the X guide shaft 15 is 105 mm, the total length of the X guide shaft 15 is 245 mm, and the movement range at the time of sewing except when detecting the out-of-step origin is set to 130 mm. A range in which the carriage portion 17 does not slide is provided at each end of the X guide shaft 15 at 5 mm. When the X carriage portion 17 is located on the leftmost side, the distance between the right fitting portion 17b and the right end of the X guide shaft 15 is the maximum separation distance (137 mm = maximum movement amount 130 mm during sewing + left side sewing time) Margin of 5 mm + the difference between the margin at the time of sewing on the right side and the margin at the time of origin detection is 2 mm). When the maximum separation distance occurs, the XSM shaft 29a and the X carriage portion 17 are configured to be separated from each other in the center, that is, the rotation center of the projection 33a and the X carriage projection 17a are most separated from each other. .
[0029]
Next, the Y direction moving mechanism for moving the cloth in the front-rear direction of the sewing machine body will be described.
[0030]
As shown in FIGS. 6 and 12, a Y frame 35 and a Y moving SM 37 (hereinafter referred to as YSM) are attached to the X carriage portion 17, and the three gear shafts 35 a, 35 b, and 35 c are erected on the Y frame 35. The intermediate gear 39, the Y moving gear pulley 41, and the tension pulley 43 are rotatably attached to each other. The Y guide shaft 45 is fixed to the left end of the Y frame 35 so that the Y guide shaft 45 extends in the front-rear direction of the sewing machine body when the cloth movement unit is attached to the sewing machine body. A YSM gear 47 having a YSM protrusion 47a is press-fitted into the YSM shaft 37a. A large gear 39a of the intermediate gear 39 is attached to the YSM gear 47, and a gear portion of the Y moving gear pulley 41 is attached to the small gear 39b of the intermediate gear 39. It has been. A timing belt 49 is hung on the pulley portion of the Y moving gear pulley 41 and the tension pulley 43.
[0031]
The Y carriage body 51 detachably holds an embroidery frame 31 at the right end, and a Y belt loop 53 is attached to the left end. The left end of the Y belt spring 53 holds the Y frame 35 so as to be slidable only in the axial direction of the Y guide shaft 45 so as to prevent the Y carriage portion 51 and the Y belt spring 53 from rotating about the Y guide shaft 45. It is configured. A timing belt 49 is held at the right end of the Y belt loop 53.
[0032]
The gear ratio relationship of the Y moving mechanism is that the number of teeth of the YSM gear 47 is 14 teeth, the number of teeth of the large gear 39a of the intermediate gear 39 is 35 teeth, the number of teeth of the small gear 39b is 14 teeth, and the gear of the Y moving gear pulley 41 The number of teeth of the part is 42 teeth, the circular diameter of the pulley pitch part of the Y moving gear pulley 41 is 11.46 mm (= tension pulley diameter), and 7.5 × (14/35) × when the YSM shaft 37a rotates 7.5 degrees The Y belt spring 53 is moved by (14/42) × 11.46 × π / 360 = 0.1 mm.
[0033]
A Y carriage protrusion 51 a is formed on the center line of the YSM gear 47 and the timing belt 49 in FIG. 9 on the Y carriage body 51, and the Y carriage body 51 is above the lower end of the Y guide shaft 45 (see FIG. 9). It is assembled so as to contact the YSM protrusion 47a at the position on the back side of the sewing machine and below the sewing range lower end (front end) (front side of the sewing machine). When the YSM shaft 37a rotates in the clockwise direction indicated by the arrow in FIG. 6, the Y carriage body 51 is moved downward (front side of the sewing machine), and the YSM protrusion 47a contacts the side surface of the Y carriage protrusion 51a. At this time, the step-out origin detection is also performed in the YSM 37 as in the XSM 29 described above. The number of teeth of the intermediate gear 39 between the SM gear and the moving gear pulley indicates that the timing belt can be moved in either forward or reverse direction.
[0034]
As described above, the embroidery frame 31 that supports the cloth is moved by the XSM 29 and YSM 37 forward, backward, left, and right with respect to the sewing needle of the sewing machine body. The position of the embroidery frame 31 is sequentially stored by the CPU of the sewing machine main body in a nonvolatile memory that stores stored contents even when the power is turned off.
[0035]
Next, referring to the flowchart of FIG. 10, the origin detection of the XSM 29 performed when the power supply is once turned off due to a sewing needle breakage or an overload on the sewing machine motor and then turned on again will be described. . Note that the origin detection for YSM 37 is performed in the same manner as for XSM 29.
[0036]
First, the X carriage unit 17 is moved toward the XSM shaft 29a by a distance (147 mm = 137 + 10: see FIG. 11) obtained by adding a distance (10 mm) for eliminating an assembly error or the like to the previous maximum separation distance. Then, the XSM shaft 29a is rotated clockwise by the number of pulses Pmax (the number of origin detection pulses) (S10 to S20). At this time, the XSM 29 is excited in the order of AB → BC → CD → DA → AB →..., And the XSM shaft 29a and the XSM protrusion 33a rotate in synchronization. As the XSM shaft 29a rotates, the X carriage portion 17 slides along the X guide shaft 15 along the axial direction, and moves to the vicinity of the right end of the movable range beyond the moving range during sewing. Abuts against the XSM protrusion 33a, the XSM shaft 29a is forcibly prevented from rotating, and at the same time, the X carriage portion 17 is also prevented from moving. At the time of this contact, the moving direction of the X carriage protruding portion 17a and the moving direction of the XSM protruding portion 33a are substantially opposite and in a straight line, but the angle formed by the X carriage protruding portion 17a and the XSM protruding portion 33a is It is almost a right angle.
[0037]
During the movement of the X carriage 17, if the cumulative number i of excited pulses exceeds the predetermined pulse number P0 (S14: Y), the excitation interval becomes longer (change from interval t1 to interval t2). The predetermined number of pulses P0 corresponds to the number of pulses for the X carriage unit 17 to move a distance (= 65 mm) that is a half of the normal sewing range. If the X carriage protrusion 17a and the XSM protrusion 33a are separated from each other by a half of the normal sewing range before the origin is detected, before the X carriage protrusion 17a reaches the XSM protrusion 33a, the pulse When the cumulative number i exceeds the predetermined number of pulses P0 (S20: N), the moving speed of the X carriage 17 is automatically reduced. Further, if the X carriage protrusion 17a and the XSM protrusion 33a are separated by a distance less than one half of the normal sewing range before the origin is detected, the X carriage protrusion 17a and the XSM protrusion 33a contact each other. Later, the cumulative number of pulses i exceeds a predetermined number of pulses P0, and the pressure on both members in contact automatically decreases.
[0038]
Further, after the X carriage projection 17a and the XSM projection 33a contact each other, the XSM projection 33a and the X carriage projection 17a physically do not move while being in contact with each other. BC → CD → DA → AB →... Is continuously repeated until the cumulative number i of excited pulses becomes equal to or greater than the origin detection pulse number Pmax.
[0039]
As described above, the movement speed is reduced because the distance between the X carriage projection 17a and the XSM projection 33a is less than a predetermined distance and approaches, thereby reducing the impulse between the X carriage projection 17a and the XSM projection 33a. To be done. Alternatively, the decrease in the pressure between the X carriage projection 17a and the XSM projection 33a prevents the X carriage projection 17a and the XSM projection 33a from coming into contact with each other for a long time at a high pressure. If the excitation interval is lengthened in this way, the life of each component can be extended and noise can be reduced.
[0040]
This series of excitations repeats the excitation to the XSM 29 by the number of steps required to move the X carriage part 17 to the right by 147 mm, and ends with the AB phase finally excited. In the case of this mechanism, since it is in contact with the X carriage projecting portion 17a, it can always end by being excited by the AB phase in FIG. 5A, and this position is the stop position when the origin of the X direction moving mechanism is detected. It is. The origin detection described above is performed in parallel with the YSM 37 by the contact between the carriage protrusion 51a and the YSM protrusion 47a. Even if the moving direction of the Y carriage protruding portion 51a and the moving direction of the YSM protruding portion 47a are substantially orthogonal to each other, the step-out origin can be detected in the same manner, and the Y carriage protruding portion 51a and the YSM protruding portion 47a are arranged substantially in parallel. Abut.
[0041]
Next, since the X carriage portion 17 is moved by a distance (= 67 mm) to the initial position before starting sewing so as to be separated from the XSM shaft 29a, the XSM shaft 29a is used with the pulse number P1 (initial position pulse number). Is rotated counterclockwise (S22). At this time, excitation is started from the AB phase, and excitation is sequentially performed in the order of AB → DA → CD → BC → AB →..., And the X carriage portion 17 moves to the center of the moving range during sewing. When the “restart” part of the touch panel is pressed, the relative position between the sewing needle and the cloth when sewing is interrupted is calculated based on the stored contents of the non-volatile memory, and then calculated from the initial position. The XSM 29 is controlled so as to move the embroidery frame 31 to the specified position, and sewing is resumed. The YSM 37 is also controlled for the initial position for sewing.
[0042]
Since the variation of the parts transmitting the power of the XSM 29 and YSM 37 described above does not have to approach the AB phase (b) of the next phase group, there is about 2.6 mm from the X carriage protrusion 17a to the XSM protrusion 33a. A margin 13 times as large as 0.2 mm can be obtained when the carriage portion 17 and the end face of the fixed member of the X guide shaft 15 (X frame 13 bent portion) are used. In addition, in consideration of the accumulated tolerance of each part in general pressing, cutting, powder metallurgy (sintering), injection molding, etc., the variation in the contact portion between the X carriage protrusion 17a and the XSM protrusion 33a is ± Since it is about 1 mm or less, it is a step-out origin detection method that can be realized sufficiently.
[0043]
The claim rotating body corresponds to the SM gear portions 33 and 47, and the claim moving body corresponds to the X carriage body 17 and the Y carriage body 51. The claim gear portions correspond to the SM gear portions 33b and 47b, the claim contact portions correspond to the SM protrusion portions 33a and 47a, and the moving member corresponds to the carriage protrusion portions 11a and 51a. The actuating member corresponds to each of the timing belts 25 and 49. The movement range with respect to the sewing mechanism of the claim is a range in which the embroidery frame 31 is moved during normal sewing.
[0044]
【The invention's effect】
As is clear from the above detailed description, according to the stepping motor out-of-step detecting apparatus of claim 1, the rotating body that rotates in synchronization with the stepping motor, the moving member that moves by the rotation of the stepping motor, and However, when the phase corresponding to the origin of the stepping motor is excited, the stepping motor steps out and the origin of the stepping motor becomes constant, so high assembly accuracy and high part accuracy are necessarily required. In addition, a device for detecting the origin of the stepping motor can be easily manufactured at low cost.
[0045]
According to the stepping origin detecting device for the stepping motor according to claim 2, since the contacted portion attached to the rotating shaft and the moving member are in contact with each other, an assembling error and a low component accuracy are provided in the mechanism for decelerating. Even if this occurs, the step-out origin detection of the stepping motor can be made constant.
[0046]
According to the stepping motor out-of-step origin detecting device of the third aspect, the origin of the stepping motor becomes constant by the contact between the rotating body and the moving member, so that the seam is satisfactorily formed regardless of the origin detection during sewing. be able to.
[0047]
According to the stepping motor out-of-step detecting apparatus of the fourth aspect, the stepping motor is out of step due to the contact between the rotating body and the moving member at a position beyond the moving range with respect to the sewing mechanism, and the stepping motor has an origin. Since it is constant, high assembly accuracy and high component accuracy are not necessarily required, and a device for easily detecting the origin of the stepping motor can be manufactured at low cost.
[0048]
According to the stepping motor out-of-step detecting apparatus of the fifth aspect, the excitation of the stepping motor is weakened at the time of contact between the rotating body and the moving member, the contact between the rotating body and the moving member is stabilized, and the origin is surely set. Can be detected. Further, when the moving speed of the moving member is lowered before the rotating body and the moving member, the contact sound between the rotating body and the moving member can be reduced.
[0049]
According to the stepping motor out-of-step detecting apparatus of the sixth aspect, even if the distance between the rotating body and the moving member exceeds a preset maximum separation distance, the rotating body and the moving member are reliably in contact with each other. Then, since the stepping motor steps out and the origin of the stepping motor becomes constant, a high degree of assembly accuracy and high component accuracy are not necessarily required.
[Brief description of the drawings]
FIG. 1 is an external view of an embroidery sewing machine having a configuration of a step-out origin detecting device for a stepping motor according to the present invention.
FIG. 2 is a block diagram showing an electrical configuration of the sewing machine main body.
FIG. 3 is a schematic view showing a stepping motor and a transmission mechanism.
FIG. 4 is a schematic view showing a stepping motor.
FIG. 5 is a schematic view showing the inside of a stepping motor.
FIG. 6 is a diagram showing a cloth moving mechanism by a stepping motor.
FIG. 7 is a side view of a stepping motor and a transmission mechanism.
FIG. 8 is a plan view showing a configuration of contact in a straight line.
FIG. 9 is a plan view showing a configuration in which contact is made in a substantially orthogonal direction.
FIG. 10 is a flowchart of the origin detection operation of the sewing machine body.
FIG. 11 is an explanatory diagram for explaining the operation of the sewing machine main body.
FIG. 12 is an enlarged view of a main part of the Y-direction moving mechanism.
[Explanation of symbols]
23 Y movement unit
25 Timing belt
27 X moving gear pulley
29 Stepper motor for X movement (XSM)
29a XSM axis
31 Embroidery frame
33a XSM protrusion
37 Y-moving stepping motor (YSM)
37a YSM axis
47a YSM protrusion
49 Timing Belt

Claims (6)

In the stepping motor step-out origin detecting device for detecting the origin when controlling the stepping motor,
A rotating body attached to rotate integrally with the rotating shaft of the stepping motor;
A moving member that can approach and move away from the rotating body by rotation of the stepping motor and abuts the rotating body when a phase corresponding to the origin of the stepping motor is excited;
The stepping motor step-out origin detecting device, wherein the stepping motor steps out by contact between the rotating body and the moving member. The said rotary body contains the gear part and the to-be-contacted part contact | abutted to the said moving member, The said moving member is provided in the action | operation member decelerated by the said gear and act | operates. Stepping motor step-out origin detection device. The stepping motor out-of-step origin detecting device according to claim 1, wherein the moving member is a part of a cloth moving unit that moves the work cloth with respect to the sewing needle. In the stepping motor out-of-step origin detecting device for detecting the origin for controlling the stepping motor that moves the cloth with respect to the sewing mechanism,
A rotating body attached to rotate integrally with the rotating shaft of the stepping motor;
A moving member that can approach and move away from the rotating body by rotation of the stepping motor and abuts the rotating body when a phase corresponding to an origin of the stepping motor is excited;
Control means for controlling the stepping motor to move the moving member closer to the rotating body beyond a moving range with respect to the sewing mechanism;
A stepping motor out-of-step origin detecting device, wherein the stepping motor steps out by contact between the rotating body and the moving member at a position beyond a moving range with respect to the sewing mechanism. The control means controls to decrease the moving speed of the moving member to the rotating body before stopping the excitation to the stepping motor after the contact between the rotating body and the moving member. The step-out origin detecting device for a stepping motor according to claim 4. 5. The stepping motor step-out origin detecting device according to claim 4, wherein the control means controls the moving member to move a distance exceeding a maximum separation distance between the rotating body and the moving member.

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