Sewing device applied to stitch length adjustment and stitch length adjustment method

Abstract

The invention discloses a sewing device applied to stitch length adjustment and a stitch length adjustment method. The sewing device comprises a motor, a controller, a contact sensing circuit, a detection circuit and a processing circuit. The processing circuit is configured to execute the following steps: setting a target stitch length of sewing; receiving the sensing result from the contact sensing circuit, and judging whether to control the motor to stop the rotation of the main shaft according to the sensing result; when the motor is controlled to enable the main shaft to stop rotating, the current relative rotation amount is received from the detection circuit, and the current stitch length of sewing is calculated according to the current relative rotation amount; and calculating at least one target relative rotation amount according to the current stitch length and the target stitch length, and controlling the main shaft to rotate the at least one target relative rotation amount so as to adjust the distance among the plurality of stitch setting positions of the sewing from the current stitch length to the target stitch length. Therefore, the effects of avoiding the consumption of human resources and improving the accuracy of stitch length adjustment can be achieved.

Description

Technical Field

[0001] The present invention relates to a technology for textile applications, and particularly to a sewing device for stitch pitch adjustment and a method for adjusting the stitch pitch. Background Art

[0002] In recent years, textile devices have been widely used in the textile industry. When sewing fabrics, it is often necessary to adjust the most suitable stitch pitch for the fabric. Further, the size of the stitch pitch varies depending on the material of the sewn object and the different requirements for surface aesthetics. For example, soft and thin sewn objects are suitable for small stitch pitches, while hard and thick sewn objects are suitable for large stitch pitches. In current textile technologies, it often relies on the experience and operation skills of users to adjust the most suitable stitch pitch for the fabric. However, manual adjustment often has errors and consumes a large amount of human resources. Therefore, how to avoid the consumption of human resources and improve the accuracy of stitch pitch adjustment is an urgent problem for those skilled in the art. Summary of the Invention

[0003] The main objective of the present invention is to provide a sewing device for stitch pitch adjustment and a method for adjusting the stitch pitch, which can avoid the consumption of human resources and improve the accuracy of stitch pitch adjustment.

[0004] To achieve the above objective, on the one hand, the present invention provides a sewing device for stitch pitch adjustment, including: a motor configured to control the rotation of a main shaft; a controller configured to control a stitch pitch adjustment rod to move towards a driving block; a contact sensing circuit configured to sense whether the stitch pitch adjustment rod is inserted into a groove on the driving block to generate a sensing result; a detection circuit configured to detect a current relative rotation amount of the main shaft; and a processing circuit coupled to the motor, the controller, the detection circuit, and the contact sensing circuit, configured to perform the following steps: setting a target stitch pitch for sewing; receiving the sensing result from the contact sensing circuit, and determining whether to control the motor to stop the rotation of the main shaft according to the sensing result; when controlling the motor to stop the rotation of the main shaft, receiving the current relative rotation amount from the detection circuit to calculate a current stitch pitch of the sewing according to the current relative rotation amount; and calculating at least one target relative rotation amount according to the current stitch pitch and the target stitch pitch, and controlling the main shaft to rotate the at least one target relative rotation amount to adjust a distance between a plurality of needle insertion positions of the sewing from the current stitch pitch to the target stitch pitch.

[0005] In an embodiment, the sensing result indicates that the stitch pitch adjustment rod has been inserted into the groove on the driving block or the stitch pitch adjustment rod has not been inserted into the groove on the driving block, and the current relative rotation amount is a counterclockwise rotation angle of a reference point on the current main shaft relative to an original position.

[0006] In one embodiment, the sewing device further includes: a memory configured to store a previous relative rotation amount corresponding to a historical stitch pitch set previously, wherein the processing circuit is further configured to control the motor to rotate the main shaft by the previous relative rotation amount so that the stitch pitch adjusting rod is inserted into the groove on the driving block.

[0007] In one embodiment, the memory is further configured to store a correspondence between a rotation angle of the main shaft and a stitch pitch of sewing, wherein the processing circuit is further configured to perform the following steps: calculate a stitch pitch difference between the current stitch pitch and the target stitch pitch, and convert the stitch pitch difference into the at least one target relative rotation amount according to the correspondence.

[0008] In one embodiment, the memory is further configured to store a correspondence between a rotation angle of the main shaft and a stitch pitch of sewing, wherein the at least one target relative rotation amount includes the first relative rotation amount and the second relative rotation amount, and the processing circuit is further configured to perform the following steps: convert the current stitch pitch and the target stitch pitch into the reverse first relative rotation amount and the forward second relative rotation amount respectively according to the correspondence; control the motor to rotate the main shaft reversely by the first relative rotation amount, and control the motor to stop rotating the main shaft; and control the motor to rotate the main shaft forward by the second relative rotation amount, and control the motor to stop rotating the main shaft.

[0009] To achieve the above object, on the other hand, the present invention provides a method for adjusting a stitch pitch, which is applied to a sewing device for stitch pitch adjustment. The method for adjusting a stitch pitch includes: setting a target stitch pitch of sewing through a processing circuit; controlling a main shaft to rotate through a motor; controlling a stitch pitch adjusting rod to move towards a driving block through a controller; receiving a sensing result from a contact sensing circuit through the processing circuit, and judging whether to control the motor to stop rotating the main shaft according to the sensing result; when controlling the motor to stop rotating the main shaft, receiving a current relative rotation amount from a detection circuit through the processing circuit to calculate a current stitch pitch of sewing according to the current relative rotation amount; and calculating at least one target relative rotation amount according to the current stitch pitch and the target stitch pitch through the processing circuit, and controlling the main shaft to rotate by the at least one target relative rotation amount to adjust a distance between a plurality of needle penetration positions of sewing from the current stitch pitch to the target stitch pitch.

[0010] In one embodiment, the sensing result indicates that the stitch pitch adjusting rod has been inserted into the groove on the driving block or the stitch pitch adjusting rod has not been inserted into the groove on the driving block, and the current relative rotation amount is a counterclockwise rotation angle of a reference point on the current main shaft relative to an original position.

[0011] In one embodiment, the method for adjusting the stitch density further includes: controlling, by the processing circuit, the motor to rotate the main shaft by a previous relative rotation amount so that the stitch density adjusting rod is inserted into the groove on the driving block, where the previous relative rotation amount corresponds to a historical stitch density set in the previous time.

[0012] In one embodiment, the step of calculating the at least one target relative rotation amount according to the current stitch density and the target stitch density and controlling the main shaft to rotate the at least one target relative rotation amount includes: calculating, by the processing circuit, a stitch density difference between the current stitch density and the target stitch density, and converting the stitch density difference into the at least one target relative rotation amount according to the correspondence between a rotation angle of the main shaft and a stitch density of sewing, and then controlling the motor to stop the rotation of the main shaft.

[0013] In one embodiment, the step of calculating the at least one target relative rotation amount according to the current stitch density and the target stitch density and controlling the main shaft to rotate the at least one target relative rotation amount includes: converting, by the processing circuit, the current stitch density and the target stitch density into the reverse first relative rotation amount and the forward second relative rotation amount respectively according to the correspondence between a rotation angle of the main shaft and a stitch density of sewing; controlling the main shaft to rotate reversely by the first relative rotation amount, and controlling the motor to stop the rotation of the main shaft; and controlling, by the processing circuit, the main shaft to rotate forward by the second relative rotation amount, and controlling the motor to stop the rotation of the main shaft.

[0014] Compared with the related art, the technical effect that the present invention can achieve is to utilize the automatic rotation of the main shaft and the automatic movement of the stitch density adjusting rod, so that the stitch density adjusting rod can be further inserted into the groove on the driving block, thereby avoiding the consumption of human resources and improving the accuracy of stitch density adjustment. Description of the Drawings

[0015] Figure 1 is a block diagram of a sewing device applied to stitch density adjustment in some embodiments;

[0016] Figure 2A is an overall schematic diagram of a sewing device 100 applied to stitch density adjustment in some embodiments;

[0017] Figure 2B is an enlarged view of a stitch density adjustment structure NS provided in the sewing device 100 in some embodiments;

[0018] Figure 3 is a longitudinal sectional view of a main shaft RS in some embodiments;

[0019] Figure 4 is a flowchart of a method for adjusting stitch density in some embodiments;

[0020] Figure 5 Schematic diagram of the movement of the sewing needle ND in some embodiments;

[0021] Figure 6 Schematic diagram of the current stitch pitch d1 and the target stitch pitch d2 in some embodiments;

[0022] Among them, reference numerals:

[0023] 100: Sewing device;

[0024] 110: Motor;

[0025] 120: Controller;

[0026] 130: Processing circuit;

[0027] 140: Contact sensing circuit;

[0028] 150: Detection circuit;

[0029] 160: Memory;

[0030] 170: Driving block;

[0031] 171: Groove;

[0032] 180: Eccentric cam;

[0033] 190: Stitch pitch adjustment lever;

[0034] NS: Stitch pitch adjustment structure;

[0035] RS: Spindle;

[0036] ND: Sewing needle;

[0037] RP: Reed part;

[0038] op: Original position;

[0039] rp: Reference point;

[0040] cc: Center of circle;

[0041] L1 - L2: On-line connection;

[0042] θ: Included angle;

[0043] S410 - S460: Steps;

[0044] HL1 - HL2: Horizontal line;

[0045] CT, CT’: Cloth surface;

[0046] vd: Vertical distance;

[0047] p1 to pn, p1' to pn': Lower needle positions;

[0048] d1 to d2: Needle pitches. Detailed implementation manners

[0049] Refer to together Figure 1 、 Figure 2A and Figure 2B , Figure 1 FIG. 1 is a block diagram of a sewing device 100 applied to needle pitch adjustment in some embodiments, Figure 2A FIG. 2 is a schematic diagram of the overall sewing device 100 in some embodiments, Figure 2B FIG. 3 is an enlarged view of a needle pitch adjustment structure NS disposed in the sewing device 100 in some embodiments. As Figure 1 and Figures 2A to 2B shown, the sewing device 100 applied to needle pitch adjustment includes a motor 110, a controller 120, a processing circuit 130, a contact sensing circuit 140, and a detection circuit 150. The processing circuit 130 is coupled to the motor 110, the controller 120, the contact sensing circuit 140, and the detection circuit 150.

[0050] In this embodiment, the motor 110 controls the rotation of the main shaft RS to drive the rotation of the driving block 170 on the main shaft RS. Among them, the driving block 170 on the main shaft RS is engaged with the eccentric cam 180 when the needle pitch adjustment rod 190 is inserted into the groove 171 on the driving block 170 (that is, at this time, the fixed slide of the driving block 170 will be pushed open so that the driving block 170 is engaged with the eccentric cam 180). Among them, the motor 110 further controls the rotation of the main shaft RS to drive the rotation of both the driving block 170 and the eccentric cam 180 when the driving block 170 is engaged with the eccentric cam 180, thereby adjusting the distance between multiple lower needle positions (that is, the positions where the sewing needle ND needles on the fabric surface) of sewing. The controller 120 controls the movement of the needle pitch adjustment rod 190 towards the driving block 170. In some embodiments, the main shaft RS is disposed in the sewing device 100 along the Y direction of the plane shown in FIG. 2. In some embodiments, the motor 110 controls the main shaft RS to rotate counterclockwise with the Y direction as the axis. In some embodiments, the needle pitch adjustment rod 190 is disposed in the sewing device 100 along the Figure 2B X direction of the plane shown in FIG. 3. In some embodiments, the controller 120 controls the magnetic reed part RP to drive the movement of the needle pitch adjustment rod 190. In some embodiments, the magnetic reed part RP includes a magnetic reed switch (not shown) and a pneumatic driver (not shown).

[0051] In some embodiments, the motor 110 can be any type of servo motor (e.g., a DC servo motor, an AC servo motor, a positioning rotary servo motor, a continuous rotary servo motor, or a linear servo motor, etc.). In some embodiments, the controller 120 can be implemented by a combinational logic controller or a microprogram controller, etc. In some embodiments, the reed switch can be implemented by any type of solenoid valve, electromagnet, or electromagnetic motor, etc. In some embodiments, the pneumatic driver can be implemented by any type of pneumatic cylinder, rotary cylinder, or pneumatic motor, etc.

[0052] Specifically, the controller 120 can turn on the reed switch so that the axis of the pneumatic driver drives the stitch pitch adjusting rod 190 to move towards the drive block 170. When the controller 120 controls the stitch pitch adjusting rod 190 to move towards the drive block 170, the groove 171 on the drive block 170 may not be in the position corresponding to the stitch pitch adjusting rod 190 (i.e., since the main shaft RS drives the drive block 170 to rotate counterclockwise, the groove 171 may not be in Figure 2B the position of the groove 171 in). At this time, the stitch pitch adjusting rod 190 cannot be inserted into the groove 171 on the drive block 170. Since the stitch pitch adjusting rod 190 cannot be inserted into the groove 171 on the drive block 170, the drive block 170 is not engaged with the eccentric cam 180. Therefore, the main shaft RS will not be able to drive the eccentric cam 180 to rotate counterclockwise. The rotation of the main shaft RS only drives the rotation of the drive block 170, causing the sewing needle ND to Figure 2A change its position in the Z direction of the plane shown. The subsequent paragraphs will further illustrate the change in the position of the sewing needle ND in the Z direction, which will not be elaborated further here.

[0053] When the groove 171 on the drive block 170 is exactly in the position corresponding to the stitch pitch adjusting rod 190 (i.e., the main shaft RS drives the groove 171 on the drive block 170 to rotate counterclockwise to Figure 2B the position of the groove 171 in), the stitch pitch adjusting rod 190 can be inserted into the groove 171 on the drive block 170. Once the stitch pitch adjusting rod 190 is inserted into the groove 171 on the drive block 170, the drive block 170 is engaged with the eccentric cam 180. Therefore, the motor 110 can control the main shaft RS to rotate counterclockwise to drive the eccentric cam 180 to rotate counterclockwise to change the eccentricity (or called the eccentric distance) of the eccentric cam 180, where the eccentricity is proportional to the stitch pitch. The stitch pitch referred to in this embodiment is the distance between multiple needle insertion positions of sewing. In other words, if the stitch pitch adjusting rod 190 is not inserted into the groove 171 on the drive block 170, the main shaft RS cannot drive the eccentric cam 180 to rotate counterclockwise to change the eccentricity.

[0054] In this embodiment, the contact sensing circuit 140 senses whether the stitch pitch adjusting lever 190 is inserted into the groove 171 on the driving block 170 to generate a sensing result. In some embodiments, the sensing result indicates that the stitch pitch adjusting lever 190 has been inserted into the groove 171 on the driving block 170 or the stitch pitch adjusting lever 190 has not been inserted into the groove 171 on the driving block 170. In some embodiments, the contact sensing circuit 140 can be implemented by any type of resistive contact sensing circuit or capacitive contact sensing circuit, etc.

[0055] In this embodiment, the detection circuit 150 detects the current relative rotation amount of the main shaft RS. In some embodiments, the current relative rotation amount is the counterclockwise rotation angle of the reference point on the current main shaft RS relative to the original position. In some embodiments, the positions of the reference point on the main shaft RS and the original position can be preset by the user in advance or preset by the production machine during production. In some embodiments, the detection circuit 150 can be implemented by any type of rotary encoding circuit. The current relative rotation amount of the main shaft RS is further described below. Referring together Figure 3 , Figure 3 is a longitudinal sectional view of the main shaft RS in some embodiments. As Figure 3 shown, when the connection line L1 between the reference point rp on the main shaft RS and the center cc of the main shaft RS is parallel to the Z direction, the position of the reference point rp is the original position op. It should be noted that the original position op can also be set at other positions without any particular limitation.

[0056] Next, when the main shaft RS rotates counterclockwise by θ degrees, there is an included angle θ between the connection line L2 between the reference point rp on the main shaft RS and the center cc of the main shaft RS and the connection line L1. At this time, the included angle θ is the above-mentioned current relative rotation amount. If the stitch pitch adjusting lever 190 is not inserted into the groove 171 in the driving block 170, the included angle θ will remain at the same angle.

[0057] In this embodiment, the processing circuit 130 executes the stitch pitch adjustment method described in the following paragraphs. In some embodiments, the sewing device 100 further includes a memory 160 that stores the correspondence between the rotation angle of the main shaft RS (i.e., the included angle θ described above) and the stitch pitch (for example, when the included angle θ is 120 degrees, the stitch pitch is 10 cm). In some embodiments, the processing circuit 130 reads this correspondence in the memory and converts the stitch pitch into a distance corresponding to the rotation angle of the main shaft RS according to this correspondence (for example, when the rotation angle of the main shaft RS is 120 degrees, the stitch pitch is converted into 10 cm). In some embodiments, the processing circuit 130 can be implemented by a central processing unit (CPU), a microcontrol unit (MCU), a programmable logic controller (PLC), a system on chip (SoC), a field programmable gate array (FPGA), etc., but is not limited thereto. In some embodiments, the memory 160 can be implemented by a memory unit, a flash memory, a read-only memory, a hard disk, or any storage component with equivalent performance, etc.

[0058] The following further describes the stitch pitch adjustment method of the present invention. Referring together to Figure 4 , Figure 4 is a flowchart of the stitch pitch adjustment method in some embodiments. This stitch pitch adjustment method is applicable to Figure 1 and Figures 2A to 2B the sewing device 100 shown.

[0059] As Figure 4 shown, the stitch pitch adjustment method includes steps S410 to S460. First, in step S410, the processing circuit 130 sets a target stitch pitch. In some embodiments, the sewing device 100 further includes a human-machine interface (not shown), and the human-machine interface can receive the target stitch pitch input by the user. For example, the human-machine interface can be a touch panel or a keyboard, etc., and the user can input the target stitch pitch through the touch panel or the keyboard to transmit the target stitch pitch to the processing circuit 130. In some embodiments, the target stitch pitch indicates the distance between a plurality of needle-down positions that the user wants to sew. In some embodiments, the motor 110 controls the main shaft RS to rotate clockwise to drive the driving block 170 to rotate, so that the position of the sewing needle ND reaches the upper needle position (for example, when the main shaft RS rotates clockwise by 120 degrees, the position of the sewing needle ND will reach the upper needle position (i.e., the highest position)). It should be noted that the method of moving to the upper needle position can prevent collisions with objects on the fabric surface when readjusting the stitch pitch of the sewing needle ND.

[0060] The following uses a specific example to illustrate the upper needle position. Refer to Figure 5 , Figure 5 which is a schematic diagram of the movement of the needle ND in some embodiments. As Figure 5 shown, assume that the height of the position of the needle ND is on the horizontal line HL1 above the fabric surface CT. The motor 110 controls the main shaft RS to rotate clockwise to drive the drive block 170 to rotate, so that the position of the needle ND continuously moves along the Z direction until the height of the position of the needle ND is on the horizontal line HL2. At this time, the needle ND has moved up a vertical distance vd. The position of the needle ND is the upper needle position. In this embodiment, the position of the horizontal line HL2 is higher than the position of the horizontal line HL1, and the height of the horizontal line HL2 is the maximum height that the needle ND can reach.

[0061] Returning to Figure 4 , in step S420, the motor 110 controls the main shaft RS to rotate to drive the drive block 170 on the main shaft RS to rotate. In step S430, the controller 120 controls the stitch pitch adjusting lever 190 to move towards the drive block 170. In some embodiments, the memory 160 can pre-store a previous relative rotation amount corresponding to the historical stitch pitch set previously. In some embodiments, the processing circuit 130 controls the motor 110 to rotate the main shaft RS counterclockwise by the previous relative rotation amount so that the stitch pitch adjusting lever 190 is inserted into the groove 171 on the drive block 170. In other embodiments, when the memory 160 does not pre-store the previous relative rotation amount corresponding to the stitch pitch set previously, the processing circuit 130 controls the motor 110 to continuously rotate the main shaft RS counterclockwise until the stitch pitch adjusting lever 190 is inserted into the groove 171 on the drive block 170.

[0062] In step S440, the processing circuit 130 receives the sensing result from the contact sensing circuit 140 and determines whether to control the motor 110 to rotate the main shaft RS according to the sensing result. In some embodiments, when the sensing result indicates that the stitch pitch adjusting lever 190 has been inserted into the groove 171 on the drive block 170, the processing circuit 130 controls the motor 110 to stop rotating the main shaft RS. Conversely, when the sensing result indicates that the stitch pitch adjusting lever 190 has not been inserted into the groove 171 on the drive block 170, the processing circuit 130 controls the motor 110 to continuously rotate the main shaft RS counterclockwise until the stitch pitch adjusting lever 190 is inserted into the groove 171 on the drive block 170. At this time, since the stitch pitch adjusting lever 190 has been inserted into the groove 171 on the drive block 170, the rotation of the drive block 170 can drive the rotation of the eccentric cam 180.

[0063] In step S450, when the control motor 110 stops the main shaft RS from rotating, the processing circuit 130 receives the current relative rotation amount from the detection circuit 150 to calculate the current stitch pitch according to the current relative rotation amount. In some embodiments, the processing circuit 130 reads the above-mentioned correspondence between the rotation angle of the main shaft RS and the stitch pitch from the memory 160, and converts the current relative rotation amount into the current stitch pitch according to this correspondence. For example, assuming that this correspondence is that a rotation angle of 120 degrees corresponds to a stitch pitch of 5 cm and the current relative rotation amount is 60 degrees, the processing circuit 130 can convert 60 degrees into a stitch pitch of 2.5 cm. At this time, the current stitch pitch is 2.5 cm.

[0064] In step S460, the processing circuit 130 calculates at least one target relative rotation amount according to the current stitch pitch and the target stitch pitch, and controls the motor 110 to rotate the main shaft RS by at least one target relative rotation amount to drive the drive block 170 and the eccentric cam 180 to rotate, thereby adjusting the distance between multiple needle-insertion positions of the sewing from the current stitch pitch to the target stitch pitch. Further, since the stitch pitch adjusting rod 190 has been inserted into the groove 171 on the drive block 170, the drive block 170 has been engaged with the eccentric cam 180. When the motor 110 controls the main shaft RS to rotate, the rotation of the main shaft RS will drive the eccentric cam 180 to rotate by at least one target relative rotation amount. Thereby, the rotation of the eccentric cam 180 will drive the change of the stitch pitch.

[0065] In some embodiments, the processing circuit 130 calculates the stitch pitch difference between the current stitch pitch and the target stitch pitch, and converts the stitch pitch difference into at least one target relative rotation amount according to the above-mentioned correspondence between the rotation angle of the main shaft RS and the stitch pitch. At this time, the distance between multiple needle-insertion positions of the sewing is the target stitch pitch. It should be noted that using the method of stitch pitch difference can adjust the stitch pitch to the target stitch pitch more quickly.

[0066] For example, assuming that the correspondence is that a rotation angle of 120 degrees corresponds to a stitch pitch of 5 cm, the current relative rotation amount is 60 degrees, the current stitch pitch is 2.5 cm, and the target stitch pitch is 5 cm, the processing circuit 130 subtracts the current stitch pitch (i.e., 2.5 cm) from the target stitch pitch (i.e., 5 cm) to calculate the stitch pitch difference (i.e., 2.5 cm), and converts the stitch pitch difference into at least one target relative rotation amount (i.e., 60 degrees) according to the above-mentioned correspondence. At this time, the processing circuit 130 controls the motor 110 to rotate the main shaft RS counterclockwise by 60 degrees to adjust the distance between multiple needle-insertion positions of the sewing from 2.5 cm to 5 cm, and controls the motor 110 to stop the main shaft RS from rotating after the main shaft RS rotates counterclockwise by 60 degrees.

[0067] In some other embodiments, at least one target relative rotation amount includes a first relative rotation amount and a second relative rotation amount. In some embodiments, the processing circuit 130 converts the current stitch pitch and the target stitch pitch into a reverse first relative rotation amount and a forward second relative rotation amount respectively according to the above corresponding relationship between the rotation angle of the main shaft RS and the stitch pitch. Then, the processing circuit 130 controls the motor 110 to rotate the main shaft RS reversely by the first relative rotation amount (i.e., the relative rotation amount is reset to zero), and controls the motor 110 to stop the rotation of the main shaft RS. Then, the processing circuit 130 controls the motor 110 to rotate the main shaft RS forward by the second relative rotation amount, and controls the motor 110 to stop the rotation of the main shaft RS. At this time, the distance between multiple needle - down positions of the sewing is the target stitch pitch. It should be noted that using the method of resetting the relative rotation amount will make the adjustment of the stitch pitch more accurate.

[0068] For example, assume that the corresponding relationship is that a rotation angle of 120 degrees corresponds to a stitch pitch of 5 cm, the current relative rotation amount is 60 degrees, the current stitch pitch is 2.5 cm, and the target stitch pitch is 5 cm. The processing circuit 130 converts the current stitch pitch (i.e., 2.5 cm) and the target stitch pitch (i.e., 5 cm) into a reverse first relative rotation amount (i.e., - 60 degrees) and a forward second relative rotation amount (i.e., 120 degrees) respectively according to the corresponding relationship. Then, the processing circuit 130 controls the main shaft RS to rotate counter - clockwise by - 60 degrees to adjust the distance between multiple needle - down positions of the sewing from 2.5 cm to 0 cm, and controls the motor 110 to stop the rotation of the main shaft RS. Then, the processing circuit 130 controls the main shaft RS to rotate counter - clockwise by 120 degrees to adjust the distance between multiple needle - down positions of the sewing from 0 cm to 5 cm, and controls the motor 110 to stop the rotation of the main shaft RS.

[0069] The following uses an actual example to illustrate the adjustment of the stitch pitch. Refer to Figure 6 , Figure 6 which is a schematic diagram of the current stitch pitch d1 and the target stitch pitch d2 in some embodiments. As Figure 6 shown, there are multiple needle - down positions p1 - pn on the fabric surface CT, and the distance between the needle - down positions p1 - pn is the stitch pitch d1. When the distance between the needle - down positions p1 - pn is increased from the stitch pitch d1 to the stitch pitch d2, the processing circuit 130 can use the above - mentioned method to adjust the distance between the needle - down positions p1 - pn, and then control the sewing needle ND to stitch at multiple needle - down positions p1' - pn' on the fabric surface CT', where the distance between the needle - down positions p1' - pn' is the stitch pitch d2.

[0070] In summary, the sewing device and the method for adjusting stitch density proposed by the present invention utilize the automatic rotation of the main shaft and the automatic movement of the stitch density adjustment lever, enabling the stitch density adjustment lever to be further inserted into the groove on the driving block. In this way, different from the traditional method of manually pressing the stitch density adjustment lever, the sewing device and the method for adjusting stitch density proposed by the present invention will greatly save the labor of manual operation. In addition, different from the traditional method of manually adjusting the main shaft, the sewing device and the method for adjusting stitch density proposed by the present invention will greatly increase the accuracy of stitch density adjustment.

[0071] Although the present invention has been disclosed as above by way of examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the relevant technical field may make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope defined in the patent of the present invention.

Claims

1. A sewing device applied to stitch length adjustment, characterized in that Comprising: A motor configured to control the rotation of a main shaft to drive the rotation of a driving block on the main shaft, wherein the driving block on the main shaft is configured to engage with an eccentric cam when a stitch pitch adjusting rod is inserted into a groove on the driving block, and wherein the motor is further configured to control the rotation of the main shaft to drive both the driving block and the eccentric cam to rotate simultaneously when the driving block engages with the eccentric cam, thereby adjusting a distance between a plurality of needle insertion positions of sewing; A controller configured to control the movement of the stitch pitch adjusting rod towards the driving block; A contact sensing circuit configured to sense whether the stitch pitch adjusting rod is inserted into a groove on the driving block to generate a sensing result; A detection circuit configured to detect a current relative rotation amount of the main shaft; And A processing circuit coupled to the motor, the controller, the detection circuit, and the contact sensing circuit, configured to perform the following steps: Set a target stitch pitch for sewing; Receive the sensing result from the contact sensing circuit and determine whether to control the motor to stop the rotation of the main shaft based on the sensing result; When controlling the motor to stop the rotation of the main shaft, receive the current relative rotation amount from the detection circuit to calculate a current stitch pitch of sewing based on the current relative rotation amount; And Calculate at least one target relative rotation amount based on the current stitch pitch and the target stitch pitch, and control the motor to rotate the main shaft by the at least one target relative rotation amount to drive the driving block and the eccentric cam to rotate, thereby adjusting the distance between the plurality of needle insertion positions of sewing from the current stitch pitch to the target stitch pitch.

2. The sewing device applied to stitch pitch adjustment according to claim 1, characterized in that, Wherein the sensing result indicates that the stitch pitch adjusting rod has been inserted into the groove on the driving block or the stitch pitch adjusting rod has not been inserted into the groove on the driving block, and wherein the current relative rotation amount is a counterclockwise rotation angle of a reference point on the current main shaft relative to an original position.

3. The sewing device applied to stitch pitch adjustment according to claim 1, wherein Further comprising: A memory configured to store a previous relative rotation amount corresponding to a historical stitch pitch set previously, and wherein the processing circuit is further configured to control the motor to rotate the main shaft by the previous relative rotation amount to insert the stitch pitch adjusting rod into the groove on the driving block.

4. The sewing device applied to stitch pitch adjustment according to claim 3, characterized in that, Wherein the memory is further configured to store a correspondence relationship between a rotation angle of the main shaft and a stitch pitch of sewing, and wherein the processing circuit is further configured to perform the following steps: Calculate a stitch pitch difference between the current stitch pitch and the target stitch pitch, and convert the stitch pitch difference into the at least one target relative rotation amount according to the correspondence relationship.

5. The sewing device applied to stitch pitch adjustment according to claim 3, characterized in that, Wherein the memory is further configured to store a correspondence relationship between a rotation angle of the main shaft and a stitch pitch of sewing, wherein the at least one target relative rotation amount includes a first relative rotation amount and a second relative rotation amount, and wherein the processing circuit is further configured to perform the following steps: Convert the current stitch pitch and the target stitch pitch into the reverse first relative rotation amount and the forward second relative rotation amount respectively according to the correspondence relationship; Control the motor to rotate the main shaft reversely by the first relative rotation amount, and control the motor to stop the rotation of the main shaft; And Control the motor to rotate the main shaft forward by the second relative rotation amount, and control the motor to stop the rotation of the main shaft.

6. A method for adjusting stitch density, applied to a sewing device for stitch density adjustment, characterized in that The method for adjusting the stitch density includes: Setting a target stitch density for sewing through a processing circuit; Controlling a main shaft to rotate through a motor to drive a driving block on the main shaft to rotate. The driving block on the main shaft is configured to engage with an eccentric cam when a stitch density adjusting rod is inserted into a groove on the driving block. The motor is further configured to control the rotation of the main shaft to drive the driving block and the eccentric cam to rotate simultaneously when the driving block engages with the eccentric cam, thereby adjusting a distance between a plurality of needle insertion positions during sewing; Controlling a stitch density adjusting rod to move towards the driving block through a controller; Receiving a sensing result from a contact sensing circuit through the processing circuit and determining whether to control the motor to stop the rotation of the main shaft according to the sensing result; When controlling the motor to stop the rotation of the main shaft, receiving a current relative rotation amount from a detection circuit through the processing circuit to calculate a current stitch density for sewing according to the current relative rotation amount; and Calculating at least one target relative rotation amount according to the current stitch density and the target stitch density through the processing circuit, and controlling the motor to rotate the main shaft by the at least one target relative rotation amount to drive the driving block and the eccentric cam to rotate, thereby adjusting the distance between the plurality of needle insertion positions during sewing from the current stitch density to the target stitch density.

7. The method for adjusting stitch density according to claim 6, wherein The sensing result indicates that the stitch density adjusting rod has been inserted into the groove on the driving block or the stitch density adjusting rod has not been inserted into the groove on the driving block. The current relative rotation amount is a counterclockwise rotation angle of a reference point on the current main shaft relative to an original position.

8. The method for adjusting stitch density according to claim 6, characterized in that, Further includes: Controlling the motor to rotate the main shaft by a previous relative rotation amount to insert the stitch density adjusting rod into the groove on the driving block through the processing circuit, where the previous relative rotation amount corresponds to a historical stitch density set in the previous time.

9. The method for adjusting stitch density according to claim 8, characterized in that, The step of calculating at least one target relative rotation amount according to the current stitch density and the target stitch density and controlling the main shaft to rotate by the at least one target relative rotation amount includes: Calculating a stitch density difference between the current stitch density and the target stitch density through the processing circuit, and converting the stitch density difference into the at least one target relative rotation amount according to a correspondence between a rotation angle of the main shaft and a stitch density during sewing, and then controlling the motor to stop the rotation of the main shaft.

10. The method for adjusting stitch density according to claim 8, wherein, The step of calculating at least one target relative rotation amount according to the current stitch density and the target stitch density and controlling the main shaft to rotate by the at least one target relative rotation amount includes: Converting the current stitch density and the target stitch density into a reverse first relative rotation amount and a forward second relative rotation amount respectively according to a correspondence between a rotation angle of the main shaft and a stitch density during sewing through the processing circuit; Controlling the main shaft to rotate reversely by the first relative rotation amount through the processing circuit and controlling the motor to stop the rotation of the main shaft; and Controlling the main shaft to rotate forward by the second relative rotation amount through the processing circuit and controlling the motor to stop the rotation of the main shaft.

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