JP2014064825A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine capable of improving the efficiency of sewing work.SOLUTION: A sewing machine includes: a feed bar supporting a feed dog; a power transmission mechanism allowing the feed bar to operate in a transfer direction in which cloth is transferred; and a cloth feed motor operating the power transmission mechanism. The sewing machine stores, in a table, the drive condition of the cloth feed motor as a drive pattern associated with the types of a feed dog, a needle plate and a sewing needle. A CPU of the sewing machine receives the input of the drive pattern. When it is detected that a pedal is depressed (S21: YES), the CPU reads the drive condition constituting the drive pattern from the table (S23). The CPU drives and controls the cloth feed motor under the read drive condition to perform sewing (S29). The feed dog moves along an optimum movement locus for the combination of the feed dog, the needle plate and the sewing needle.

Description

  The present invention relates to a sewing machine capable of changing a movement locus of a feed dog.

  Conventionally, there is a sewing machine that can change the movement trajectory of the feed dog according to the thickness of the cloth, the material, and the like. In a conventional sewing machine, an operator changes a movement locus of a feed dog by providing a mechanism for adjusting a feed dog driving mechanism. For example, the sewing machine described in Patent Document 1 includes an eccentric cam of an adjusting body with respect to a horizontal feed shaft as a mechanism for adjusting a feed dog driving mechanism. The movement trajectory is changed by the operator manually adjusting the phase of the eccentric cam. The operator can adjust the phase of the eccentric cam without using a tool such as a screwdriver.

JP 2000-42270 A

  When the feed dog is changed according to the thickness of the cloth, it is necessary to readjust the feed dog drive mechanism so that the changed feed dog moves along an appropriate movement trajectory. However, in the sewing machine of Patent Document 1, the mechanism for adjusting the feed dog drive mechanism is manually adjusted by the operator. Therefore, it takes time to adjust the drive mechanism for moving the feed dog along the movement trajectory suitable for the feed dog, and there is a problem that the sewing operation cannot be performed efficiently.

  An object of the present invention is to provide a sewing machine that can improve the efficiency of sewing work.

  The sewing machine according to the present invention includes a feed base that supports a feed dog that feeds the cloth in the horizontal direction, a first power mechanism that imparts a vertical motion to the feed base in synchronization with the vertical motion of the sewing needle, and the feed A sewing machine comprising: a second power mechanism that imparts an operation in a transport direction that is a direction of transporting the cloth to a table; a power motor that operates the second power mechanism; and a driving condition of the power motor at least as the feed dog A storage unit stored as a drive pattern associated with the type of the first drive unit, a first receiving unit that receives an input of the drive pattern, and a drive control of the power motor, and the vertical movement of the feed dog by the first power mechanism Motor control means for operating the feed dog in the conveying direction in response to the driving pattern received by the first receiving means among the driving conditions stored in the storage unit The power motor in the associated drive conditions of the type of feed dog based on is characterized in that a motor control means for controlling to drive.

  The sewing machine of the present invention can be controlled so that the power motor is driven under a driving condition suitable for the type of feed dog, and the second power mechanism can be easily operated. Even when the feed dog is changed, the sewing machine can operate the second power mechanism so that the feed dog after the change moves along an optimal movement trajectory. The operator does not need to manually change the driving condition of the power motor. Therefore, the sewing machine can improve the sewing work of the operator.

  The sewing machine of the present invention includes a needle plate through which the sewing needle passes when the sewing needle moves in the vertical direction, and the storage unit sets the driving condition of the power motor to a combination of the feed dog type and the needle plate type. Stored as an associated drive pattern, and the motor control means determines the type of the feed dog and the type of the needle plate based on the drive pattern received by the first receiving means among the drive conditions stored in the storage unit. You may control so that the said power motor drives with the drive condition relevant to a combination. When the needle plate is changed, the movement trajectory of the optimum feed dog for feeding the cloth changes. The sewing machine can easily control the drive motor so that the feed dog feeds the cloth appropriately even after the needle plate is changed, and can easily move the feed dog along the optimal movement trajectory.

  In the sewing machine of the present invention, the storage unit stores the drive condition of the power motor as a drive pattern associated with a combination of the feed dog type and the sewing needle type, and the motor control unit stores the drive condition in the storage unit. The driving motor may be controlled to be driven under a driving condition related to a combination of the feed dog type and the sewing needle type based on the driving pattern received by the first receiving unit. . When the sewing needle is changed, the movement trajectory of the optimum feed dog for feeding the cloth changes. The sewing machine can easily control the power motor so that the feed dog feeds the cloth appropriately even after the sewing needle is changed, and can easily move the feed dog along the optimal movement trajectory.

  The sewing machine of the present invention includes a spindle motor that rotates a spindle that drives the sewing needle in the vertical direction, and the storage unit has a drive pattern that associates the driving conditions of the power motor and the spindle motor with the type of the feed dog. The motor control unit may store the spindle motor so that the spindle motor is driven under a driving condition of the spindle motor related to a feed dog type based on the drive pattern received by the first receiving unit. When the feed dog is changed, the driving condition of the spindle motor for proper sewing changes. The sewing machine can easily drive and control the spindle motor so as to perform appropriate sewing even after the feed dog is changed.

  The sewing machine of the present invention includes a setting unit that sets the driving condition in the driving pattern stored in the storage unit, and the setting unit includes a second receiving unit that receives an input of the driving condition, and the second receiving unit. Storage control means for storing the drive condition in the storage unit based on the input received by the control unit. The operator can easily set the driving condition of the power motor for appropriately operating the second power mechanism according to the feed dog to the designated driving condition.

The perspective view of the sewing machine 1. FIG. FIG. 3 is an enlarged perspective view in the vicinity of a sewing needle 8 and a needle plate 15. The perspective view of the cloth feed motor 23, the cloth feed mechanism 32, and the power transmission mechanism 35. FIG. 1 is a block diagram of an electrical configuration of a sewing machine 1. FIG. The figure which shows the movement locus | trajectory 205 of the feed dog 331. FIG. The figure which shows the relationship between an upper shaft angle and a cloth feed shaft angle. The figure which shows the movement locus | trajectory 205 of the feed dog 332. The figure which shows the movement locus | trajectory 210 of the feed dog 332. The figure which shows the sewing needles 8 and 81. FIG. The figure which shows the movement locus | trajectory 215 of the feed dog 332. The figure which shows the relationship between an upper shaft angle and a cloth feed shaft angle. The figure which shows the table 471. FIG. The figure which shows the table 472. FIG. The figure which shows the table 473. FIG. The figure which shows a table creation process. The figure which shows a 1st selection process. The figure which shows a 2nd selection process. The figure which shows a setting process. The figure which shows a table selection process. The figure which shows a sewing process.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The configuration of the sewing machine 1 will be described with reference to FIGS. The upper side, lower side, right side, left side, front side, and back side of FIG. 1 are the upper side, lower side, right side, left side, front side, and rear side of the sewing machine 1, respectively.

  The sewing machine 1 includes a bed 2, a pedestal 3, and an arm 4. The bed part 2 is a foundation of the sewing machine 1. The bed 2 is mounted from above in a rectangular hole (not shown) on the upper surface of the table 20. The pedestal 3 extends vertically upward from the right end of the bed 2. The arm portion 4 extends leftward from the upper end of the pedestal column portion 3. The arm part 4 faces the upper surface of the bed part 2. The arm portion 4 is provided with a presser foot 17 below the left end portion. The presser foot 17 faces the needle plate 15 provided on the upper surface of the bed portion 2. The arm portion 4 holds a needle bar 7 therein. The needle bar 7 has a sewing needle 8 attached to the lower end. The needle bar 7 and the sewing needle 8 reciprocate up and down as the spindle motor 30 is driven. The arm portion 4 includes a balance 9 in front of the left end portion. The balance 9 moves up and down in conjunction with the needle bar 7. The arm unit 4 includes an operation unit 10 at the top. The operation unit 10 includes a panel display unit 111 and operation keys 112 on the front surface. The operation keys 112 include a “+” key, a “−” key, a “decision” key, a “start” key, and an “end” key. The operator operates the operation keys 112 while looking at the panel display unit 111 to input various instructions to the sewing machine 1.

  The sewing machine 1 includes a control device 16 below the table 20. The control device 16 is connected to a stepping pedal 22 via a rod 21. The operator operates the pedal 22 to the toe side or the heel side. The control device 16 controls the operation of the sewing machine 1 according to the operation direction and the operation amount of the pedal 22.

  The pedestal 3 has a spindle motor 30 at the upper right side. The arm portion 4 includes a main shaft 14 inside. The main shaft 14 extends in the left-right direction inside the arm portion 4 in a rotatable state. The right end of the spindle 14 is connected to the spindle motor 30. The left end of the main shaft 14 is connected to a needle bar vertical movement mechanism (not shown). The spindle motor 30 drives the spindle 14 to move the needle bar 7 and the balance 9 up and down.

  As shown in FIG. 2, the bed portion 2 includes a needle plate 15 at the upper left end. The needle plate 15 has a needle hole 18 in a substantially central portion. The lower end of the sewing needle 8 passes through the needle hole 18 when lowered. The needle plate 15 is provided with a feed dog hole 19 on each of the left side, the rear side, the right side, and the front side of the needle hole 18. The feed dog hole 19 is a rectangular hole that is long in the front-rear direction. The bed portion 2 includes a shuttle mechanism (not shown) and a cloth feed mechanism 32 (see FIG. 3) below the needle plate 15.

  The cloth feed motor 23, the cloth feed mechanism 32, and the power transmission mechanism 35 will be described with reference to FIG. The upper side, lower side, left side, right side, front side, and back side of FIG. 3 are the upper side, lower side, rear side, front side, left side, and right side of the sewing machine 1, respectively. W1 indicates the vicinity of the feed dog 33. The cloth feed motor 23 is arranged on the right side of the cloth feed mechanism 32. A cloth feed output shaft 24 of the cloth feed motor 23 extends leftward from the motor body. The cloth feed motor 23 is a stepping motor, and can rotate the cloth feed output shaft 24 within a range of a predetermined angle. The cloth feed motor 23 moves the cloth feed mechanism 32 in the front-rear direction.

  The cloth feed mechanism 32 includes a feed base 34 and a feed dog 33. The feed base 34 is located below the needle plate 15 and is substantially parallel to the needle plate 15. The feed base 34 includes a feed dog 33 near the center of the upper surface. The feed dog 33 corresponds to the position of the feed dog hole 19. The feed dog 33 is long in the front-rear direction. The length of the feed dog 33 in the front-rear direction is shorter than the length of the feed dog hole 19. The feed dog 33 is provided with irregularities on the upper part for sandwiching the cloth with the presser foot 17 (see FIG. 2).

  The power transmission mechanism 35 includes a horizontal feed shaft 36, a first arm portion 37, a working arm portion 38, a second arm portion 39, and a connection portion 40. The horizontal feed shaft 36 is rotatably supported on the bed portion 2 at the upper left of the cloth feed motor 23. The horizontal feed shaft 36 extends in the left-right direction. One end of the first arm portion 37 is connected perpendicularly to the cloth feed output shaft 24. One end of the working arm portion 38 is connected perpendicularly to the vicinity of the right end of the horizontal feed shaft 36. The second arm portion 39 is connected to each of the other end of the first arm portion 37 and the other end of the working arm portion 38 in a rotatable state. The connecting portion 40 extends upward from the vicinity of the left end of the horizontal feed shaft 36. The connecting portion 40 is rotatably connected to the front end portion of the feed base 34 of the cloth feed mechanism 32.

  The operation of the power transmission mechanism 35 will be described. The cloth feed motor 23 rotates the cloth feed output shaft 24 within a range of a predetermined angle. The cloth feed output shaft 24 is located at an intermediate position in the rotation range in the state shown in FIG. When the cloth feed output shaft 24 is positioned at an intermediate position in the rotation range, the first arm portion 37 and the second arm portion 39 are aligned with each other in the vertical direction. The other end of the working arm 38 is located at the upper end of the movable range, and the upper end of the connecting portion 40 is located at the front end of the movable range. Therefore, the cloth feed mechanism 32 is located at the front end of the movable range.

  When the cloth feed output shaft 24 rotates clockwise from the state shown in FIG. 3, the connecting portion between the first arm portion 37 and the second arm portion 39 moves forward. The first arm portion 37 and the second arm portion 39 are bent to each other, and the other end portion of the working arm portion 38 is lowered. Therefore, the horizontal feed shaft 36 rotates counterclockwise as viewed from the left side, and the upper end portion of the connecting portion 40 moves rearward. Accordingly, the cloth feed mechanism 32 moves rearward. When the cloth feed output shaft 24 reaches one end of the rotation range, the other end of the working arm 38 moves to the lower end of the movable range, and the cloth feed mechanism 32 moves to the rear end of the movable range.

  When the cloth feed output shaft 24 is reversed and rotated counterclockwise as viewed from the left side, the connecting portion of the first arm portion 37 and the second arm portion 39 moves rearward. Of the angles formed by the first arm portion 37 and the second arm portion 39, the smaller angle gradually increases. Therefore, the other end part of the action arm part 38 rises, and the cloth feed mechanism 32 moves forward. When the cloth feed output shaft 24 reaches an intermediate position (position shown in FIG. 3) in the rotation range, the cloth feed mechanism 32 returns to the front end of the movable range. When the cloth feed output shaft 24 further rotates counterclockwise as viewed from the left side, the first arm portion 37 and the second arm portion 39 are bent to each other, and the other end portion of the working arm portion 38 is lowered. Therefore, the cloth feed mechanism 32 moves backward. When the cloth feed output shaft 24 reaches the other end of the rotation range, the other end of the working arm 38 moves to the lower end of the movable range, and the cloth feed mechanism 32 moves to the rear end of the movable range. As described above, every time the cloth feed output shaft 24 rotates from one end of the rotation range to the other end, the cloth feed mechanism 32 swings back and forth horizontally.

  The sewing machine 1 includes a vertical feed shaft 27 behind the cloth feed mechanism 32. The vertical feed shaft 27 is rotatably supported by the bed portion 2 and extends in the left-right direction. The vertical feed shaft 27 is positioned parallel to the horizontal feed shaft 36. The vertical feed shaft 27 includes a pulley 25 at the right end. The pulley 25 is connected to the main shaft 14 (see FIG. 1) via a timing belt (not shown). Therefore, the main shaft 14 and the vertical feed shaft 27 rotate while maintaining synchronization. The vertical feed shaft 27 includes an eccentric portion 28 at the left end. The eccentric portion 28 moves the cloth feed mechanism 32 up and down as the vertical feed shaft 27 rotates. In the sewing machine 1, the feed dog 33 and the feed base 34 reciprocate up and down once while the needle bar 7 and the sewing needle 8 reciprocate up and down once. That is, in the sewing machine 1, the vertical movement of the sewing needle 8 and the vertical movement of the feed dog 33 are mechanically synchronized.

  When the feed base 34 rises, the feed dog 33 protrudes above the needle plate 15 from the feed dog hole 19 and sandwiches the cloth between the presser foot 17. If the cloth has a predetermined thickness or less, the sewing needle 8 does not pierce the cloth while the feed dog 33 is positioned above the needle plate 15. During the execution of sewing, the sewing machine 1 monitors the rotation angle phase of the output shaft of the spindle motor 30 and the cloth feed output shaft 24 of the cloth feed motor 23. The sewing machine 1 synchronizes the spindle motor 30 and the cloth feed motor 23, and drives the cloth feed motor 23 while the feed dog 33 is positioned above the needle plate 15. Therefore, the cloth moves in the front-rear direction with the sewing needle 8 not pierced. When the feed base 34 is lowered, the feed dog 33 is positioned below the needle plate 15. If the feed dog 33 is positioned below the needle plate 15, the cloth does not move even if the feed dog 33 moves in the front-rear direction. The sewing needle 8 forms a seam on the cloth while the feed dog 33 is positioned below the needle plate 15. As described above, the sewing machine 1 executes the driving of the cloth feed mechanism 32 in the horizontal direction (the front-rear direction in the present embodiment) and the sewing needle 8 with different motors.

  The electrical configuration of the sewing machine 1 will be described with reference to FIG. The control device 16 of the sewing machine 1 includes a CPU 44. The CPU 44 controls the sewing machine 1. The CPU 44 includes a ROM 45 and a RAM 46 inside. The CPU 44 is connected to an EEPROM (registered trademark) 47 and an I / O interface (hereinafter referred to as “I / O”) 48 via a bus. The ROM 45 stores a program for executing a table creation process (see FIG. 15), a table selection process (see FIG. 19), and a sewing process (see FIG. 20), which will be described later. The RAM 46 temporarily stores various values necessary for executing the program. The EEPROM 47 is a non-volatile storage device that stores various values. The EEPROM 47 stores tables 471 (see FIG. 12), 472 (see FIG. 13), and 473 (see FIG. 14) which will be described later.

  The I / O 48 is electrically connected to the pedal 22, the operation key 112, the drive circuits 51, 52, 53, the spindle encoder 55, and the cloth feed encoder 56. The CPU 44 acquires the operation direction and operation amount of the pedal 22. The CPU 44 acquires an operation instruction from the operator from the operation key 112. The drive circuit 51 drives the panel display unit 111. The drive circuit 52 drives the spindle motor 30 in accordance with a torque command signal input from the CPU 44. The sewing machine 1 includes a spindle encoder 55 for detecting the rotation speed and rotation angle phase of the output shaft of the spindle motor 30. The spindle encoder 55 outputs the detection result of the rotation speed and rotation angle phase of the output shaft of the spindle motor 30 to the I / O 48. The drive circuit 53 drives the cloth feed motor 23 by outputting a pulse signal to the cloth feed motor 23 in accordance with the cloth feed drive signal input from the CPU 44. The sewing machine 1 includes a cloth feed encoder 56 for detecting the rotation speed and the rotation angle phase of the cloth feed output shaft 24 (see FIG. 3) of the cloth feed motor 23. The cloth feed encoder 56 outputs the detection result of the rotation speed and rotation angle phase of the cloth feed output shaft 24 of the cloth feed motor 23 to the I / O 48.

  The trajectory of the feed dog 33 will be described with reference to FIGS. 5, 7, 8, and 10 show the feed dog 33 and the needle plate 15 as viewed from the left side. The main shaft 14 (see FIG. 1) and the vertical feed shaft 27 (see FIG. 3) rotate while maintaining synchronization, and move the cloth feed mechanism 32 (see FIG. 3) up and down. While the needle bar 7 and the sewing needle 8 (see FIG. 2) reciprocate up and down once, the feed dog 33 (see FIG. 3) reciprocates up and down once. Each time the cloth feed output shaft 24 of the cloth feed motor 23 rotates from one end of the rotation range to the other end, the cloth feed mechanism 32 swings back and forth horizontally once. The cloth feed motor 23 is driven to synchronize with the spindle motor 30.

  As shown by a curve 301 (broken line) in FIG. 6, a rotation angle phase (hereinafter referred to as the rotation angle phase) of the cloth feed output shaft 24 of the cloth feed motor 23 in accordance with the rotation angle phase (hereinafter referred to as “upper shaft angle”) of the output shaft of the spindle motor 30. “Cloth feed shaft angle”) changes. The CPU 44 drives and controls the main shaft motor 30 and the cloth feed motor 23 so that the upper shaft angle and the cloth feed shaft angle indicate the relationship of the curve 301. The cloth feed shaft angle of the cloth feed motor 23 is in the range of “−30 ° to 30 °”. That is, the rotation range of the drive shaft 24 (see FIG. 3) is “−30 ° to 30 °”. When the cloth feed shaft angle is “0 °”, the state shown in FIG. 3 is obtained. While the upper shaft angle changes from “0 ° to 720 °”, the cloth feed shaft angle reciprocates once between “−30 ° to 30 °”. That is, the drive shaft 24 of the cloth feed motor 23 reciprocates once while the drive shaft (not shown) of the main shaft motor 30 rotates twice. During this time, the feed dog 33 conveys the cloth twice. The sewing needle 8 is sewn once when the spindle motor 30 makes one rotation. Note that the angles of both ends of the rotation range “−30 ° to 30 °” of the drive shaft 24 are variable in proportion to the feed amount of the cloth. As shown in FIG. 5, the feed dog 33 moves in the order of the states 203, 202, 201, and 204 along the movement locus 205 that is elliptical in side view.

  When there is a correspondence between the upper shaft angle and the cloth feed shaft angle at points 301A, 301B, 301C, and 301D on the curve 301 (see FIG. 6), the feed dog 33 is positioned at a position 301A on the movement track 205 (see FIG. 5). , 301B, 301C, 301D. When the CPU 44 controls the spindle motor 30 and the cloth feed motor 23 so as to change from the point 301 </ b> A of the curve 301 to the point 301 </ b> B, the feed dog 33 moves forward on the lower side of the needle plate 15. Since the feed dog 33 is located below the needle plate 15 (for example, states 203, 204, 201), it does not contact the cloth. Therefore, the feed dog 33 does not feed the cloth.

  When the CPU 44 controls the spindle motor 30 and the cloth feed motor 23 so as to change from the point 301B of the curve 301 (see FIG. 6) to the point 301C, the feed dog 33 moves rearward on the upper side of the needle plate 15. Since the feed dog 33 is located on the upper side of the needle plate 15 (for example, state 202), it contacts the cloth on the needle plate 15. Therefore, the feed dog 33 feeds the cloth backward. Similarly, when the CPU 44 controls the main shaft motor 30 and the cloth feed motor 23 so as to change from the point 301C to the point 301D (see FIGS. 5 and 6), the feed dog 33 moves forward. When the CPU 44 controls the spindle motor 30 and the cloth feed motor 23 so as to change from a point 301D to a point 301A (see FIGS. 5 and 6), the feed dog 33 moves rearward and feeds the cloth rearward. The sewing needle 8 is inserted into the cloth while the feed dog 33 is positioned below the needle plate 15, and forms a seam in the cloth.

  An operator may change the feed dog 33, the needle plate 15, and the sewing needle 8 in accordance with the type of cloth to be sewn (thickness, material, etc.). Specifically, when sewing a thick cloth, the height of the unevenness of the feed dog 33 is made larger than when sewing a thin cloth. Therefore, the small feed dog 331 (see FIG. 5) in the height direction is used when sewing a thin cloth, and the large feed dog 332 (see FIGS. 7 and 8) in the height direction when sewing a thick cloth. ). When sewing a thick cloth, normally, the pressure with which the presser foot 17 (see FIG. 2) presses the cloth is increased. Therefore, a needle plate 151 (see FIG. 5) with a small plate thickness is used when sewing a thin cloth, and a needle plate 152 (see FIGS. 7 and 8) with a large plate thickness is used when sewing a thick cloth. .

  FIG. 7 shows a case where the feed dog 332 is attached to the feed base 34 (see FIG. 3) instead of the feed dog 331 and the needle plate 152 is attached instead of the needle plate 151. The feed dog 332 is larger in the height direction (vertical direction) than the feed dog 331. The needle plate 152 is thicker than the needle plate 151. In the state 202, the upward projection amount of the feed dog 332 from the feed dog hole 192 is larger than the upward projection amount of the feed dog 331 from the feed dog hole 191. Therefore, when the feed dog 332 moves along the same movement locus 205 as in FIG. 5, the feed dog 332 may protrude upward from the feed dog hole 192 in the states 201 and 203. Accordingly, the horizontal movement direction of the feed dog 332 changes before and after the states 201 and 203. Therefore, when the feed dog 332 protrudes upward from the feed dog hole 192 when the horizontal movement direction of the feed dog 332 changes, the feed dog 332 feeds in the direction opposite to the direction of feeding the cloth on the needle plate 152 (from the rear to the front). A phenomenon (called “reverse feed”) occurs.

  In this case, the CPU 44 controls the driving of the spindle motor 30 and the cloth feed motor 23 so that the upper shaft angle and the cloth feed shaft angle become the movement locus 210 of FIG. As shown by a curve 302 (solid line) in FIG. 6, the cloth feed shaft angle changes according to the upper shaft angle. Specifically, the cloth feed shaft angle does not change between the points 302L and 302B on the curve 302, between the points 302C and 302E, between the points 302F and 302H, and between the points 302I and 302K. That is, the drive shaft 24 stops. When there is a correspondence between the upper axis angle and the cloth feed axis angle at points 302A to 302L on the curve 302, the feed dog 332 is at positions 302A to 302L on the movement locus 210 (see FIG. 8).

  When the CPU 44 controls the spindle motor 30 and the cloth feed motor 23 to change from the point 302A to the point 302B of the curve 302, the feed dog 332 moves downward on the lower side of the needle plate 15. Since the CPU 44 controls the cloth feed motor 23 to be stopped, the feed dog 332 does not move in the front-rear direction. The feed dog 332 is in the state 206 (see FIG. 8) at the position 302A. When the CPU 44 controls the spindle motor 30 and the cloth feed motor 23 to change from the point 302B of the curve 302 to the point 302C, the feed dog 332 moves forward on the lower side of the needle plate 15. Since the feed dog 332 is located below the needle plate 15, it does not contact the cloth. Therefore, the feed dog 332 does not feed the cloth.

  When the CPU 44 controls the spindle motor 30 and the cloth feed motor 23 so as to change in the order of the point 302C, the point 302D, and the point 302E of the curve 302, the feed dog 332 moves upward from below the needle plate 15. Since the CPU 44 controls the cloth feed motor 23 to be stopped, the feed dog 332 does not move in the front-rear direction. The feed dog 332 is in the state 208 (see FIG. 8) at the position 302D. When the CPU 44 controls the spindle motor 30 and the cloth feed motor 23 so that the curve 302 changes from the point 302E to the point 302F, the feed dog 332 moves rearward on the upper side of the needle plate 15. Since the feed dog 332 is located on the upper side of the needle plate 15, it contacts the cloth on the needle plate 15. Therefore, the feed dog 332 feeds the cloth backward.

  When the CPU 44 controls the spindle motor 30 and the cloth feed motor 23 so as to change from the point 302F of the curve 302 to the point 302G, the feed dog 33 moves downward. Since the CPU 44 controls the cloth feed motor 23 to be stopped, the feed dog 33 does not move in the front-rear direction. The feed dog 332 is in the state 206 (see FIG. 8) at the position 302G. When the CPU 44 controls the spindle motor 30 and the cloth feed motor 23 so as to change in the order of the points 302G, 302H, 302I, 302J, 302K, 302L, and 302A (see FIG. 6) of the curve 302, the feed dog 33 is positioned at positions 302A to 302A. It drives with the same movement locus as the case where it changes to the position 302G (refer FIG. 8).

  As shown in FIG. 5, in the curve 301 (see FIG. 6), the start timing of the backward movement of the feed dog 33 is when the feed dog 33 is at the positions 301B and 301D. In the curve 302 (see FIG. 6), the start timing of the backward movement of the feed dog 33 is when the feed dog 33 is at the positions 302E and 302K (see FIG. 8). Therefore, the timing at which the vertical position of the feed dog 33 is located above the needle plate 15 is the start timing. As shown in FIG. 6, when the feed dog 33 is at positions 302E and 302K (see FIG. 8), the upper shaft angle (points 302E and 302K) is at the position 301B and 301D (see FIG. 5). It is larger than the upper axis angle (points 301B and 301D). That is, in the curve 302, the start timing of the backward movement of the feed dog 33 with respect to the vertical movement of the feed dog 33 is later than that of the curve 301.

  As shown in FIG. 5, in the curve 301 (see FIG. 6), the end timing of the backward movement of the feed dog 33 is when the feed dog 33 is at the positions 301A and 301C. In the curve 302 (see FIG. 6), the end timing of the backward movement of the feed dog 33 is when the feed dog 33 is at the positions 302F and 302L (see FIG. 8). Therefore, the timing at which the vertical position of the feed dog 33 is located above the needle plate 15 is the end timing. As shown in FIG. 6, when the feed dog 33 is at positions 302F and 302L (see FIG. 8), the upper shaft angle (points 302F and 302L) is at the position 301A and 301C (see FIG. 5). It is smaller than the upper axis angle (points 301A and 301C). That is, in the curve 302, the end timing of the backward movement of the feed dog 33 with respect to the vertical movement of the feed dog 33 is earlier than that of the curve 301.

  The rotational speed of the drive shaft of the spindle motor 30 that moves the feed dog 33 in the vertical direction is the same between the curve 301 and the curve 302. For this reason, the time for the feed dog 33 to move between the points 301A and 301C and the points 301B and 301D on the curve 301 is the time to move between the points 302A and 302G and the points 302D and 302J on the curve 302. Is the same. As described above, the curve 302 has a later start timing and an end timing earlier than the curve 301. For this reason, the feed dog 33 driven by the curve 302 moves in a shorter time than the case of the curve 301. Therefore, the speed of the movement of the feed dog 33 for feeding the cloth is faster on the curve 302 than on the curve 301. Therefore, when a large feed dog 332 is used in the height direction, the start timing is late and the end timing is early, so the horizontal movement direction of the feed dog 332 changes with the feed dog 332 protruding upward from the feed dog hole 191. There is nothing. Therefore, the sewing machine 1 can suppress the reverse feed.

  When sewing a thick cloth, a thicker and longer sewing needle 8 may be used as compared with a case of sewing a thin cloth. As shown in FIG. 9, the sewing needle 81 is thicker and longer than the sewing needle 8. The sewing needle 81 reciprocates up and down as the spindle motor 30 is driven. The sewing needle 81 descends downward from above when the feed dog 33 feeds the cloth 100 backward. Since the sewing needle 81 is thicker and longer than the sewing needle 8, it is inserted into the cloth 100 earlier than the sewing needle 8. In this case, if the feed dog 33 feeds the cloth 100 along the movement locus 205 (see FIG. 5), the sewing needle 81 may pierce the cloth 100 before reaching the end timing. In this case, there is a possibility that the quality of the sewing product is deteriorated, or the cloth 100 is moved while the sewing needle 8 is stuck, the sewing needle 8 is bent, and the sewing needle 8 is broken by coming into contact with the needle plate 15.

  In the present embodiment, when the sewing needle 81 is used, the feed dog 33 feeds the cloth 100 along the movement locus 210 (see FIG. 8). That is, the end timing of the backward movement of the feed dog 33 relative to the vertical movement of the feed dog 33 is earlier than when the cloth 100 is fed along the movement track 205. Therefore, the sewing needle 8 is prevented from being stuck in the cloth 100 before the movement of the cloth 100 is completed. Therefore, the sewing machine 1 can prevent deterioration of the quality of the sewing product. The sewing machine 1 can prevent the sewing needle 8 from being bent or broken.

  When an operator sews a thick cloth, it is preferable to suppress an increase in the sewing speed so that the position of the cloth can be easily adjusted. When the operator sews a thick cloth, the CPU 44 limits the sewing speed by setting an upper limit on the rotational speed of the spindle motor 30, thereby improving the convenience of the sewing work by the operator. On the other hand, when the CPU 44 sews a thin cloth, the operator can execute the sewing work in a short time by setting no upper limit on the rotational speed of the spindle motor 30.

  The movement trajectories 205 (see FIG. 5) and 210 (see FIG. 8) are examples, and the CPU 44 drives and controls the cloth feed motor 23 so that the feed dog 33 moves along the other movement trajectories. May be. For example, the CPU 44 drives and controls the cloth feed motor 23 so that the feed dog 33 moves along the movement locus 215 shown in FIG. When the feed dog 33 moves on the movement locus 215, the correspondence between the upper shaft angle and the cloth feed shaft angle is a curve 303 (a chain line) shown in FIG. In FIG. 10, the feed dog 332 moves in the order of the states 213, 212, 211, and 214 along the movement locus 215 that is elliptical in side view. In the above description, the example in which the feed dog 33, the needle plate 15, and the sewing needle 8 are replaced according to the thickness of the cloth has been described. However, for example, the operator can use the appropriate feed dog 33, the needle plate according to the material of the cloth. 15. The needle 8 may be replaced.

  As described above, the operator uses the feed dog 33, the needle plate 15, and the sewing needle 8 that differ depending on the thickness of the cloth. In order to appropriately sew the cloths having different thicknesses, the CPU 44 drives the driving circuit 52, the spindle motor 30 and the cloth feed motor 23 so as to be driven under the optimum conditions according to the feed dog 33, the needle plate 15 and the sewing needle 8. It is preferable to output an appropriate signal to 53 to control the spindle motor 30 and the cloth feed motor 23. The sewing machine 1 according to the present embodiment includes a table 471 (see FIG. 12) in which the types of the feed dog 33, the throat plate 15, and the sewing needle 8 are associated with the driving conditions of the spindle motor 30 and the cloth feed motor 23. 4). The CPU 44 refers to the table 471 and specifies appropriate drive conditions for the spindle motor 30 and the cloth feed motor 23 according to the feed dog 33, the needle plate 15, and the sewing needle 8. The CPU 44 performs control so that the spindle motor 30 and the cloth feed motor 23 are driven under the specified driving conditions.

  Details of the table 471 will be described with reference to FIG. The table 471 includes the types of the feed dog 33, the needle plate 15, and the sewing needle 8, the cloth thickness, the driving conditions of the spindle motor 30 (maximum rotational speed, upper shaft stop angle), the driving conditions of the cloth feeding motor 23 (movement locus), A memory switch (hereinafter referred to as “memory SW”) is associated and stored. The table 471 stores identification numbers for identifying the types of the feed dog 33, the needle plate 15, and the sewing needle 8. The cloth thickness is the thickness of the cloth to be sewn. The maximum rotation speed is determined by the output shaft of the spindle motor 30 when the operator operates the pedal 22 (see FIG. 1) to maximize the sewing speed, that is, when the pedal 22 is fully depressed to the toe side. Rotation speed. The upper shaft stop angle is an upper shaft angle in a state where the driving of the main shaft motor 30 is stopped. The movement trajectory of the feed dog 33 is changed by adjusting the rotation speed of the cloth feed motor 23 (for example, the movement trajectory 205 (see FIG. 5), 210 (see FIGS. 7 and 8), 215 (see FIG. 10)). The EEPROM 47 (see FIG. 4) stores the specific drive conditions of the spindle motor 30 and the cloth feed motor 23 corresponding to each movement locus in a table 472 (see FIG. 13) different from the table 471.

  As shown in FIG. 13, the table 472 stores the upper shaft angle and the cloth feed shaft angle in association with each other. The CPU 44 outputs signals to the drive circuits 52 and 53 so as to drive and control the spindle motor 30 and the cloth feed motor 23 so that the upper shaft angle and the cloth feed shaft angle become the angles stored in the table 472. The upper shaft angle and the cloth feed shaft angle stored in the table 472 correspond to the curve 302 (see FIG. 6) and the movement locus 210 (see FIG. 8). Therefore, the CPU 44 can move the feed dog 33 along the movement locus 210 by drivingly controlling the spindle motor 30 and the cloth feed motor 23 based on the table 472. The EEPROM 47 stores a table 472 corresponding to each of the movement track identification numbers 1 to 3 stored in the table 471. Therefore, the CPU 44 can move the feed dog 33 along a plurality of different movement trajectories.

  The memories SWA to F are flag information indicating the validity / invalidity of various functions executable by the sewing machine 1 or setting information of various functions. As shown in FIG. 14, the various functions that can be executed by the sewing machine 1 are stored in the EEPROM 47 as a table 473 in association with the function numbers and the set contents. In the table 473, the function number 10 is flag information indicating whether or not the sewing speed at the start of sewing (up to three stitches) is set to a low speed. Function number 12 is the sewing speed at the start of sewing (up to three stitches). The function number 15 is selection information of a function assigned to the quick back SW that switches the cloth feeding direction to the opposite direction by pressing a predetermined operation unit. The function number 17 is an identification number indicating a pattern of front-stop sewing at the sewing start portion. The function number 18 is an identification number indicating a back end stitching pattern at the sewing end portion. The various functions stored in the table 473 and their setting contents are not limited to those described above, and other functions and setting contents may be used.

  The table 471 associates an index M (1, 2,..., 20) for each combination of driving conditions of the spindle motor 30, driving conditions of the cloth feed motor 23, and memory SW (hereinafter referred to as “driving pattern”). Remember. The table 471 includes the types of the feed dog 33, the needle plate 15, and the sewing needle 8, the cloth thickness, the driving conditions of the spindle motor 30 (maximum rotational speed, upper shaft stop angle), the driving conditions of the cloth feeding motor 23 (movement locus), An index N (1, 2,..., 14) is stored in association with each of the memories SWA to SW.

  Processing executed by the sewing machine 1 will be described with reference to FIGS. The CPU 44 of the sewing machine 1 executes table creation processing (see FIG. 15), table selection processing (see FIG. 19), and sewing processing (see FIG. 20) according to the program stored in the ROM 45. The CPU 44 executes table creation processing, table selection processing, and sewing processing in parallel. The RAM 46 stores variables M and N.

  The table creation process will be described with reference to FIG. When an instruction to start creating the table 471 (see FIG. 12) is received via the operation key 112 (see FIG. 1), the CPU 44 starts a table creation process. The CPU 44 executes a first selection process (see FIG. 16) (S1).

  As shown in FIG. 16, the CPU 44 stores 1 in the variable M and initializes it (S40). The CPU 44 determines whether selection of the “+” key among the operation keys 112 has been accepted (S41). When selection of the “+” key is accepted (S41: YES), the CPU 44 adds 1 to the variable M and stores it in the RAM 46 (S43). The process proceeds to S45. When the CPU 44 does not accept selection of the “+” key (S41: NO), the process proceeds to S45. The CPU 44 determines whether the selection of the “−” key of the operation keys 112 has been accepted (S45). When the selection of the “−” key is accepted (S45: YES), the CPU 44 subtracts 1 from the variable M and stores it in the RAM 46 (S47). The process proceeds to S49. When the CPU 44 does not accept the selection of the “−” key (S45: NO), the process proceeds to S49.

  The CPU 44 determines whether selection of the “decision” key among the operation keys 112 has been accepted (S49). If the CPU 44 does not accept the selection of the “OK” key (S49: NO), the process returns to S41. When the CPU 44 accepts the selection of the “OK” key (S49: YES), the first selection process ends, and the process returns to the table creation process (see FIG. 15).

  As shown in FIG. 15, after the end of the first selection process (S1), the CPU 44 executes a second selection process (see FIG. 17) (S3). As shown in FIG. 17, the CPU 44 stores 1 in a variable N and initializes it (S60). The CPU 44 determines whether selection of the “+” key is accepted (S61). When the selection of the “+” key is accepted (S61: YES), the CPU 44 adds 1 to the variable N and stores it in the RAM 46 (S63). The process proceeds to S65. When the CPU 44 does not accept selection of the “+” key (S61: NO), the process proceeds to S65. The CPU 44 determines whether selection of the “−” key has been accepted (S65). When the selection of the “−” key is accepted (S65: YES), the CPU 44 subtracts 1 from the variable N and stores it in the RAM 46 (S67). The process proceeds to S69. When the CPU 44 does not accept the selection of the “−” key (S65: NO), the process proceeds to S69.

  The CPU 44 determines whether selection of the “OK” key has been accepted (S69). If the CPU 44 does not accept the selection of the “OK” key (S69: NO), the process returns to S61. When the CPU 44 accepts the selection of the “OK” key (S69: YES), the second selection process ends, and the process returns to the table creation process (see FIG. 15).

  As shown in FIG. 15, after the end of the second selection process (S3), the CPU 44 executes a setting process (see FIG. 18) (S5). As shown in FIG. 18, the CPU 44 specifies information corresponding to the same indexes M and N as the variables M and N stored in the RAM 46 of the table 471 (see FIG. 12) (S80). The identified information corresponds to information to be set. Hereinafter, the specified information is referred to as “target information”. The CPU 44 determines whether selection of the “+” key has been accepted (S81). When the selection of the “+” key is accepted (S81: YES), the CPU 44 adds 1 to the target information and stores it in the table 471 (S83). The process proceeds to S85. When the CPU 44 does not accept selection of the “+” key (S81: NO), the process proceeds to S85. The CPU 44 determines whether the selection of the “−” key has been accepted (S85). When the selection of the “−” key is accepted (S85: YES), the CPU 44 subtracts 1 from the target information and stores it in the table 471 (S87). The process proceeds to S89. If the CPU 44 does not accept the selection of the “−” key (S85: NO), the process proceeds to S89. The CPU 44 determines whether selection of the “OK” key has been accepted (S89). If the CPU 44 does not accept the selection of the “OK” key (S89: NO), the process returns to S81. When the CPU 44 accepts selection of the “OK” key (S89: YES), the process proceeds to S90.

  For example, when the index N of the target information is 1 (feed dog), when the selection of the “+” key is received (S81: YES), the CPU 44 adds 1 to the identification number for identifying the feed dog 33, “−” When the selection of the key is accepted (S85: YES), 1 is subtracted from the identification number for identifying the feed dog 33. When the index N of the target information is 5 (maximum rotation speed), the CPU 44 adds 100 to the maximum rotation speed when the selection of the “+” key is accepted (S81: YES), and selects the “−” key. When it is received (S85: YES), 100 is subtracted from the maximum rotation speed. The value 100 to be added / subtracted is a minimum unit value that can change the rotational speed of the spindle motor 30. When the index N of the target information is 7 (movement locus), when the CPU 44 accepts selection of the “+” key (S81: YES), 1 is added to the identification number for identifying the movement locus, and the “−” key. When the selection is accepted (S85: YES), 1 is subtracted from the identification number for identifying the movement locus. When the index N of the target information is 8 (memory SWA), the CPU 44 adds 1 to the function number of the memory SWA when the selection of the “+” key is accepted (S81: YES), and selects the “−” key. Is received (S85: YES), 1 is subtracted from the function number of the memory SWA.

  The CPU 44 determines whether or not the index N of the target information is 8 or more, that is, the memories SWA to SW (S90). When the index N of the target information is the memory SWA to F (S90: YES), the CPU 44 determines whether selection of the “+” key has been accepted (S91). When the selection of the “+” key is accepted (S91: YES), the CPU 44 adds 1 to the setting information and stores it in the table 471 (S93). The process proceeds to S95. When the CPU 44 does not accept selection of the “+” key (S91: NO), the process proceeds to S95. The CPU 44 determines whether the selection of the “−” key is accepted (S95). When the selection of the “−” key is accepted (S95: YES), the CPU 44 subtracts 1 from the setting information and stores it in the table 471 (S97). The process proceeds to S99. When the CPU 44 does not accept the selection of the “−” key (S95: NO), the process proceeds to S99. The CPU 44 determines whether selection of the “OK” key has been accepted (S99). If the CPU 44 does not accept the selection of the “OK” key (S99: NO), the process returns to S91. When the CPU 44 accepts selection of the “OK” key (S99: YES), the setting process ends, and the process returns to the table creation process (see FIG. 15).

  For example, when the index N of the target information is 8 (memory SWA) and the index M is 1, when the CPU 44 accepts the selection of the “+” key (S91: YES), the low-speed sewing start function number 10 is effective. And When the selection of the “−” key is accepted (S95: YES), the CPU 44 invalidates the low speed at the start of sewing. When the index N of the target information is 9 (memory SWB) and the index M is 7, when the CPU 44 accepts the selection of the “+” key (S91: YES), the function starts at the low speed at the sewing start of function number 12. When the selection is made and the selection of the “−” key is accepted (S95: YES), 100 is subtracted from the low speed at the start of sewing.

  As shown in FIG. 15, after completing the setting process (see S5), the CPU 44 determines whether or not the selection of the “end” key among the operation keys 112 has been accepted (S7). If the CPU 44 does not accept the selection of the “end” key (S7: NO), the process returns to S1. When the CPU 44 accepts the selection of the “end” key (S7: YES), the table creation process ends.

  As described above, the CPU 44 can change the drive conditions constituting the drive parameters stored in the table 471 (see FIG. 12) by executing the table creation process. Therefore, the operator changes the drive condition for appropriately operating the spindle motor 30 and the cloth feed motor 23 according to the feed dog 33, the needle plate 15 and the sewing needle 8 to the drive condition input via the operation key 112. Is easily possible.

  The details of the table creation process can be changed. When executing the table creation process, the CPU 44 may display a combination of the types of the feed dog 33, the needle plate 15, and the sewing needle 8 and the drive pattern on the panel display unit 111. The operation key 112 may include a numeric keypad. The operator may input the index M, N, the drive condition, the flag information of the memory SW, etc. by inputting the number via the numeric keypad.

  The table selection process will be described with reference to FIG. When an instruction to select a control pattern stored in the table 471 (see FIG. 12) is received via the operation key 112, the CPU 44 starts a table selection process. The CPU 44 executes a first selection process (see FIG. 16) (S11). The first selection process is the same as the first selection process executed in S1 of the table creation process (see FIG. 15). The CPU 44 specifies the variable M stored in the RAM 46 by executing the first selection process. After completion of the first selection process, the CPU 44 determines whether selection of an “end” key has been accepted (S13). When the CPU 44 does not accept the selection of the “end” key (S13: NO), the process returns to S11. When the CPU 44 accepts selection of the “end” key (S13: YES), the table creation process ends.

  The details of the table selection process can be changed. When executing the table selection process, the CPU 44 may display the combination of the feed dog 33, the needle plate 15, and the sewing needle 8 on the panel display unit 111 in association with the index M of the table 471 (see FIG. 12). The operator may input the index M corresponding to the feed dog 33, the needle plate 15, and the sewing needle 8 attached to the sewing machine 1 to the sewing machine 1 by selecting the “+” key or the “−” key.

  The sewing process will be described with reference to FIG. When the power of the sewing machine 1 is turned on, the CPU 44 starts a sewing process. The CPU 44 determines whether the depression of the pedal 22 to the toe side is detected (S21). If the CPU 44 does not detect depression of the pedal 22 (S21: NO), the process returns to S21. When the CPU 44 detects the depression of the pedal 22 (S21: YES), the CPU 44 sets the spindle motor 30 and the cloth feed motor 23 corresponding to the same index M as the variable M stored in the RAM 46 of the table 471 (see FIG. 12). The drive pattern is read (S23). The CPU 44 reads out a table 472 (see FIG. 13) corresponding to the movement locus constituting the read drive pattern (S23).

  The CPU 44 performs drive control of the spindle motor 30 and the cloth feed motor 23 based on the drive pattern read in S23, and executes sewing (S29). Specifically, it is as follows.

  The CPU 44 outputs a torque command signal to the drive circuit 52 so as to drive the spindle motor 30. The CPU 44 outputs a cloth feed drive signal to the drive circuit 53 so that the cloth feed motor 23 is driven in synchronism with the spindle motor 30 based on the cloth feed shaft angle constituting the drive pattern read in S23. Therefore, the feed dog 33 moves along a movement locus constituting the drive pattern. The CPU 44 maintains the rotation speed of the spindle motor 30 at the maximum rotation speed when the rotation speed of the spindle motor 30 determined based on the depression amount of the pedal 22 becomes the maximum rotation speed constituting the drive pattern read in S23. Thus, a torque command signal is output to the drive circuit 52. The CPU 44 outputs signals to the drive circuits 52 and 53 to drive the spindle motor 30 and the cloth feed motor 23 so that various functions are operated based on the memory SW constituting the drive pattern read in S23.

  The CPU 44 determines whether the depression of the pedal 22 has been completed (S31). If the depression of the pedal 22 is not completed (S31: NO), the process returns to S31, and the CPU 44 continues sewing. When the depression of the pedal 22 is completed (S31: YES), the CPU 44 outputs a torque command signal to the drive circuit 52 so that the spindle motor 30 stops at the upper shaft stop angle constituting the drive pattern read in S23. The main shaft motor 30 stops in a state where the upper shaft angle becomes the upper shaft stop angle. The CPU 44 outputs a cloth feed drive signal to the drive circuit 53 so that the cloth feed motor 23 stops in synchronization with the spindle motor 30. The cloth feed motor 23 is stopped (S33), and the sewing process is ended.

  As described above, the sewing machine 1 stores the tables 471 and 472 in the EEPROM 47. The CPU 44 refers to the tables 471 and 472 to specify a combination of drive conditions (drive pattern) suitable for the types of the feed dog 33, the needle plate 15, and the sewing needle 8. The CPU 44 performs control so that the spindle motor 30 and the cloth feed motor 23 are driven under the drive conditions constituting the specified drive pattern. Therefore, when the feed dog 33 and the needle plate 15 are changed, the sewing machine 1 can appropriately suppress the occurrence of reverse feed in which the feed dog 33 feeds the cloth from the rear to the front. The sewing machine 1 can appropriately prevent the sewing needle 8 from contacting the cloth when the spindle motor 30 is stopped. Even when the operator changes the feed dog 33, the needle plate 15, and the sewing needle 8, it is not necessary to manually change the drive conditions of the spindle motor 30 and the cloth feed motor 23. Therefore, the sewing machine 1 can make the operator's sewing work more efficient.

  In addition, this invention is not limited to the said embodiment, A various change is possible. The table 471 stores driving patterns in which driving conditions are associated with combinations of types of the feed dog 33, the needle plate 15, and the sewing needle 8. The table 471 may store driving patterns in which only combinations of feed dog 33 types are associated with driving conditions. The table 471 may store a driving pattern in which only the combination of the feed dog 33 and the needle plate 15 is associated with the driving condition. The table 471 may store a driving pattern in which only the combination of the feed dog 33 and the sewing needle 8 is associated with the driving condition. Although the tables 471 to 473 are stored in the EEPROM 47, they may be stored in a storage device such as a flash memory connected inside the CPU 44 or outside the sewing machine 1.

  In the above, when the rotation speed of the spindle motor 30 determined based on the depression amount of the pedal 22 becomes the maximum rotation speed, the CPU 44 maintains the rotation speed of the spindle motor 30 at the maximum rotation speed. The CPU 44 may determine the rotation speed of the spindle motor 30 according to the pedal depression amount so that the spindle motor 30 rotates at the maximum rotation speed when the operator depresses the pedal 22 to the maximum.

  The drive conditions constituting the drive pattern are not limited to the maximum number of rotations, the upper shaft stop angle, and the movement locus. The drive pattern may include other drive conditions (for example, torque characteristics) of the spindle motor 30 and the cloth feed motor 23.

  The pulley 25, the vertical feed shaft 27, and the eccentric portion 28 function as the “first power mechanism” of the present invention. The power transmission mechanism 35 functions as the “second power mechanism” of the present invention. The cloth feed motor 23 functions as a “power motor” of the present invention. The EEPROM 47 in which the tables 471, 472, and 473 are stored functions as the “storage unit” of the present invention. The CPU 44 that performs table selection processing functions as the “first receiving means” of the present invention. The CPU 44 that performs the processes of S29 and S33 functions as the “motor control means” of the present invention. The CPU 44 that performs the creation process functions as the “setting unit” of the present invention. The CPU 44 that performs the processes of S81, S85, S91, and S95 functions as the “second receiving unit” of the present invention. The CPU 44 that performs the processes of S83, S87, S93, and S97 functions as the “storage control unit” of the present invention.

DESCRIPTION OF SYMBOLS 1 Sewing machine 7 Needle bar 8 Sewing needle 14 Main shaft 15, 151, 152 Needle plate 16 Control device 22 Pedal 23 Cloth feed motor 25 Pulley 27 Vertical feed shaft 28 Eccentric part 30 Main shaft motor 33 Feed dog 34 Feed base 35 Power transmission mechanism 52, 53 Driving circuit 112 Operation key

Claims (5)

A feed base for supporting the feed dog that feeds the cloth horizontally;
A first power mechanism that imparts an up and down movement to the feed base in synchronization with the up and down movement of the sewing needle;
In a sewing machine comprising a second power mechanism that imparts an operation in a conveyance direction, which is a direction in which the cloth is conveyed to the feed base,
A power motor for operating the second power mechanism;
A storage unit that stores a drive condition of the power motor as a drive pattern associated with at least the type of the feed dog,
First receiving means for receiving an input of the driving pattern;
Drive control of the power motor, motor control means for operating the feed dog in the transport direction according to the vertical movement of the feed dog by the first power mechanism, the motor control means stored in the storage unit Sewing machine comprising: motor control means for controlling the power motor to drive under a driving condition related to a type of feed dog based on the driving pattern received by the first receiving means among the driving conditions. . A needle plate through which the sewing needle passes when the sewing needle moves in the vertical direction;
The storage unit
Storing the drive condition of the power motor as a drive pattern associated with a combination of the feed dog type and the needle plate type;
The motor control means includes
The power motor is driven under a driving condition related to a combination of the feed dog type and the needle plate type based on the driving pattern received by the first receiving unit among the driving conditions stored in the storage unit. The sewing machine according to claim 1, wherein the sewing machine is controlled as follows. The storage unit
Storing the drive condition of the power motor as a drive pattern associated with a combination of the feed dog type and the sewing needle type;
The motor control means includes
The power motor is driven under a driving condition related to a combination of the type of the feed dog and the type of the sewing needle based on the driving pattern received by the first receiving unit among the driving conditions stored in the storage unit. The sewing machine according to claim 1, wherein the sewing machine is controlled. A spindle motor that rotates a spindle that drives the sewing needle in the vertical direction;
The storage unit
Storing drive conditions of the power motor and the spindle motor as drive patterns associated with the feed dog types;
The motor control means includes
4. The control according to claim 1, wherein the spindle motor is driven under the driving condition of the spindle motor related to the type of feed dog based on the drive pattern received by the first receiving unit. 5. The sewing machine according to 1. A setting unit configured to set the driving condition in the driving pattern stored in the storage unit;
The setting means includes
Second receiving means for receiving an input of the driving condition;
The sewing machine according to any one of claims 1 to 4, further comprising a storage control unit that stores the driving condition in the storage unit based on an input received by the second receiving unit.

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