JP2013179993A - sewing machine - Google Patents

Abstract

There is provided a sewing machine in which a feed amount is set in units of one stitch and sewing can be performed with high accuracy with the set feed amount.
A sewing machine includes a cloth feed motor that applies power for moving a feed dog in a horizontal direction. The CPU of the sewing machine displays an input screen for creating sewing data (S11). When the input by the user is not completed (S12: NO), the CPU repeats S12. The CPU accepts and stores input from the user while repeating S12. The user sets the cloth feed amount for each stitch. The user sets the number of stitches, the upper thread tension value, and the cloth feeding direction for each stitch. As a result, the sewing data is completed. When the input by the user is completed, the CPU stores the sewing data (S13). The CPU performs sewing using the stored sewing data. The CPU performs sewing while controlling the cloth feed motor and adjusting the feed amount and the like for each stitch.
[Selection] Figure 8

Description

  The present invention relates to a sewing machine capable of adjusting a cloth feed amount.

  Conventionally, there are sewing machines capable of adjusting the amount of cloth fed. For example, in the sewing machine described in Patent Document 1, the amount of movement of the feed dog in the horizontal direction is changed by changing the inclination angle of the square piece. Therefore, the sewing machine can adjust the feed amount of the cloth. The inclination angle of the square piece is changed by a feeding stepping motor. When the user operates an operation lever provided on the sewing machine, the feeding stepping motor is activated to change the feeding amount.

JP-A-2005-87336

  However, the sewing machine of Patent Document 1 has a feed amount that is an amount of mechanically transporting the cloth by adjusting a drive amount of a mechanism (horizontal feed arm, horizontal feed cam, etc.) relating to the cloth feed according to the inclination angle of the square piece. It has changed. Therefore, even if the sewing machine changes the inclination angle of the square piece by driving the feeding stepping motor and changes the feeding amount, the followability of the mechanism relating to cloth feeding is poor. For this reason, for example, when the feed amount is changed in units of one stitch, the sewing machine is delayed until the feed amount can be changed for each stitch. The sewing machine has a problem in that it cannot be sewn with the set feed amount if the change of the feed amount is delayed while the main shaft rotates at a high speed.

  An object of the present invention is to provide a sewing machine in which a feed amount is set in units of one stitch and sewing can be performed with high accuracy with the set feed amount.

  The sewing machine according to the present invention includes a motor that rotates a drive shaft, a feed base that supports a feed dog that transports cloth in a horizontal direction, and a horizontal direction that is connected to the drive shaft and driven by the motor. Controlling the rotation of the drive shaft of the motor, a power setting mechanism for providing the operation, data setting means for setting feed amount data in which the feed amount for transferring the cloth is set in units of one stitch, Motor control means for operating the power mechanism at the feed amount based on the feed amount data set by the data setting means. In this case, the user can set the feed amount in units of one stitch. Therefore, the range of sewing designs that can be set by the user is widened. When the feed amount data is set by the data setting means, the motor control means controls the motor so that the feed amount indicated by the feed amount data is obtained. The drive of the motor is transmitted to the feed base via a power mechanism connected to the drive shaft. Therefore, the sewing machine improves the followability to the change of the feed amount to the feed amount data set in one stitch unit. Therefore, the sewing machine can be sewn with high accuracy by the feed amount data set for each stitch.

  In the sewing machine, the data setting means may set the feed amounts for a plurality of stitches including the feed amount set in units of one stitch as the feed amount data. In this case, the sewing machine can combine the feed amounts for a plurality of stitches including the feed amount set for each stitch into one feed amount data. That is, the sewing machine can set the feed amount data as a stitch pattern program. When the feed amount data set in this way is used, the motor control means executes sewing for a plurality of stitches while automatically adjusting the feed amount. Therefore, the sewing work efficiency is further improved.

  The sewing machine further includes switching means capable of switching a plurality of the feed amount data set by the data setting means, and the motor control means uses the feed amount based on the feed amount data switched by the switching means. The power mechanism may be operated. In this case, the sewing machine can perform sewing while switching the feed amount data. Therefore, the sewing machine can form various patterns of stitches.

  In the sewing machine, the data setting means may be capable of setting the feed amount data by acquiring the feed amount data created by the data creation means capable of creating the feed amount data. In this case, even when the data creation means creates the feed amount data, the sewing machine can acquire the feed amount data. The motor control means performs sewing while automatically adjusting the feed amount. Therefore, the user can create the feed amount data using not only the sewing machine but also the data creating means. For this reason, user convenience is improved.

  In the sewing machine, the data setting means may be set as a single feed amount data by combining a plurality of the feed amount data. In this case, the data setting means can set one feed amount data by combining a plurality of feed amount data. For this reason, sewing can be performed by combining various seams. Therefore, the range of sewing designs that can be set by the user is further expanded. Also, since a plurality of feed amount data can be combined, the user's work is reduced compared to the case where the user resets one stitch at a time and creates the feed amount data. Therefore, the sewing machine further improves the efficiency of the sewing work.

  The sewing machine may further include a repeating unit that causes the motor control unit to repeatedly execute a control for operating the power mechanism with the feed amount based on the feed amount data set by the data setting unit. In this case, the sewing machine repeatedly performs sewing using the same feed amount data. Therefore, compared with the case where the user resets one stitch at a time and creates feed amount data, the user's work is reduced. Therefore, the sewing machine further improves the efficiency of the sewing work.

  In the sewing machine, the feed amount data set by the data setting means may be associated with at least one of the driving speed of the main shaft, the tension value of the upper thread, and the direction in which the cloth is conveyed. In this case, at least one of the driving speed of the spindle, the tension value of the yarn, and the direction in which the cloth is conveyed is associated with the feed amount data. Therefore, the sewing machine can adjust not only the feed amount but also at least one of the driving speed of the main shaft, the tension value of the yarn, and the direction in which the cloth is conveyed.

The perspective view of the sewing machine 1. FIG. The perspective view which shows the 1st state of the cloth feed mechanism 30. FIG. The perspective view which shows the 2nd state of the cloth feeding mechanism. The perspective view which shows the 3rd state of the cloth feed mechanism 30. FIG. 1 is a block diagram of an electrical configuration of a sewing machine 1. FIG. The data block diagram of the sewing data 81. FIG. The figure which shows the input screen 95. FIG. The flowchart of a sewing data creation process. The flowchart of a sewing process. The flowchart of a 1st normal sewing process. The data block diagram of the sewing data 82. FIG. The figure which shows the stitch which performed normal sewing using the sewing data. The flowchart of a 2nd normal sewing process. The figure which shows the stitch | interval which performed sewing with a back stitch using the sewing data 81,82,83. The data block diagram of the sewing data 83. FIG. The flowchart of a program sewing process. The data block diagram of the sewing data 84. FIG. The figure which shows the stitch which performed the program sewing using the sewing data 84. FIG. The flowchart of a pattern sewing process. The data block diagram of the sewing data 85. FIG. The figure which shows the stitch which performed the pattern sewing using the sewing data 85. FIG.

  Hereinafter, a sewing machine 1 according to a first 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 rear 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.

  As shown in FIG. 1, the sewing machine 1 includes a bed portion 2, a pedestal column portion 3, and an arm portion 4. The bed part 2 is a base of the sewing machine 1. The bed portion 2 is mounted from above on a recess (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 feed dog 34 (see FIG. 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 main motor 13 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 liquid crystal panel 11 on the front surface. The user operates the operation unit 10 while looking at the liquid crystal panel 11 and inputs various instructions to the sewing machine 1.

  The sewing machine 1 includes a control device 25 on the lower surface of the table 20. The control device 25 is connected to the stepping pedal 22 via the rod 21. The user operates the pedal 22 to the toe side or the heel side. The control device 25 controls the operation of the sewing machine 1 according to the operation direction and operation amount of the pedal 22.

  The pedestal 3 has a main motor 13 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 main shaft 14 is connected to the main motor 13. The left end of the main shaft 14 is connected to a needle bar vertical movement mechanism (not shown). The main motor 13 drives the main shaft 14 to move the needle bar 7 and the balance 9 up and down.

  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 (see FIG. 2). 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, rear and right sides of the needle hole 18 (see FIG. 2). The feed dog hole 19 has a rectangular shape that is long in the front-rear direction. The bed portion 2 includes a hook mechanism (not shown) and a cloth feed mechanism 30 (see FIGS. 2 to 4) below the needle plate 15. The cloth feeding mechanism 30 is a mechanism for feeding a cloth to be sewn.

  The configuration of the cloth feed mechanism 30 will be described with reference to FIG. The upper side, lower side, right side, left side, upper left side, and lower right side in FIG. 2 are the upper side, lower side, front side, rear side, right side, and left side of the sewing machine 1, respectively. As shown in FIG. 2, the cloth feed mechanism 30 includes a feed base 33, a feed dog 34, a cloth feed motor 35, a power transmission mechanism 40, an intermediate working arm 38, a vertical power mechanism 47, and the like.

  The feed base 33 is located below the needle plate 15 and is substantially parallel to the needle plate 15. The feed base 33 supports the three feed dogs 34 substantially horizontally near the center of the upper surface. Each of the feed dogs 34 corresponds to the position of the feed dog hole 19. Each of the feed dogs 34 is long in the front-rear direction. The length of the feed dog 34 in the front-rear direction is smaller than the length of the feed dog hole 19. The feed dog 34 is provided with irregularities for sandwiching the cloth with the presser foot 17 in the upper part. The feed dog 34 moves the cloth in the horizontal direction.

  The cloth feed motor 35 is arranged on the right side of the feed base 33. The cloth feed motor 35 is a stepping motor. The cloth feed motor 35 moves the feed base 33 in the front-rear direction. The cloth feed motor 35 includes a drive shaft 36 extending leftward. The cloth feed motor 35 rotates the drive shaft 36.

  The power transmission mechanism 40 includes a feed arm 41, a feed arm 42, and a connecting portion 65. One end of the feed arm 41 is attached perpendicular to the tip of the drive shaft 36 of the cloth feed motor 35. The other end of the feed arm 41 is rotatably connected to one end of the feed arm 42. The other end of the feed arm 42 is rotatably connected to the front end of the intermediate action arm 38 in the extending direction. A portion where the other end of the feed arm 41 and one end of the feed arm 42 are connected is a connecting portion 65. A portion where the other end of the feed arm 42 and the tip of the intermediate working arm 38 are connected is a connecting portion 66. The intermediate working arm 38 is attached to the right end of the horizontal feed shaft 28 at the end opposite to the portion connected to the connecting portion 66. The intermediate working arm 38 is orthogonal to the longitudinal direction of the horizontal feed shaft 28 and extends rearward. The horizontal feed shaft 28 is rotatably provided on the upper left side of the cloth feed motor 35. The horizontal feed shaft 28 extends in the left-right direction. The lower end of the link member 50 is attached perpendicular to the left end portion of the horizontal feed shaft 28. The upper end of the link member 50 is rotatably connected to the front end portion of the feed base 33.

  As the drive shaft 36 rotates in one direction and in the opposite direction of the rotation range, the connecting portion 65 reciprocates horizontally in the front-rear direction, and the connecting portion 66 reciprocates vertically. The intermediate working arm 38 rotates around the horizontal feed shaft 28 by the movement of the connecting portion 66. The horizontal feed shaft 28 rotates in conjunction with the rotation of the intermediate working arm 38. The feed table 33 moves in the front-rear direction by the rotation of the horizontal feed shaft 28.

  A vertical power mechanism 47 is provided at the rear end of the feed base 33. The vertical power mechanism 47 includes a vertical feed shaft 27, a pulley 24, an eccentric part 39, and a link member 51. The vertical feed shaft 27 extends in the left-right direction in a rotatable state. The vertical feed shaft 27 is positioned parallel to the horizontal feed shaft 28. The vertical feed shaft 27 fixes the pulley 24 to the right end. The pulley 24 is connected to the main shaft 14 via a timing belt (not shown). The vertical feed shaft 27 rotates in a state where synchronization with the main shaft 14 is maintained by driving of the main motor 13. The eccentric portion 39 is provided at the left end of the vertical feed shaft 27. The eccentric portion 39 is eccentric with respect to the axis of the vertical feed shaft 27. The link member 51 is rotatably provided at the rear end of the feed base 33. The link member 51 holds the eccentric part 39 rotatably. The eccentric portion 39 moves the feed base 33 up and down via the link member 51 by the rotation of the vertical feed shaft 27.

  With reference to FIGS. 2-4, the provision of the operation | movement of the front-back direction to the feed stand 33 of the cloth feed mechanism 30 is demonstrated. The cloth feed mechanism 30 repeats the following first to third states as the drive shaft 36 rotates in one direction and in the opposite direction within the rotation range, and moves the feed table 33 in the front-rear direction. Each of W <b> 1 to W <b> 3 in FIGS. 2 to 4 indicates the vicinity of the feed base 33.

  In the first state shown in FIG. 2, in the power transmission mechanism 40, the feed arm 41 and the feed arm 42 are positioned on a straight line in the vertical direction. The connecting portion 66 is located at the top and above the connecting portion 65. The intermediate working arm 38 is substantially horizontal. The feed base 33 is located in the forefront. The feed dog 34 is located in the forefront of the feed dog hole 19. The cloth feed mechanism 30 is in the first state. In the present embodiment, the position of the connecting portion 65 when the feed arm 41 and the feed arm 42 are aligned in the vertical direction is the intermediate position.

  When the cloth feed motor 35 is driven from the first state, the drive shaft 36 rotates clockwise as viewed from the left side. The feed arm 41 rotates clockwise as the drive shaft 36 rotates. The connecting portion 65 moves from the intermediate position to the front position. The feed arm 41 and the feed arm 42 are bent in an approximately L shape toward the front with the connecting portion 65 as a base point. The feed arm 42 rotates counterclockwise as viewed from the left side about the connecting portion 65. The connecting portion 66 moves downward by the rotation of the feed arm 42. The connecting portion 66 pulls the tip of the intermediate working arm 38 downward. The intermediate working arm 38 rotates counterclockwise about the horizontal feed shaft 28 and the tip thereof is inclined obliquely downward. In conjunction with the rotation of the intermediate action arm 38, the horizontal feed shaft 28 rotates counterclockwise. The link member 50 rotates counterclockwise in conjunction with the horizontal feed shaft 28. The feed base 33 moves backward. When the drive shaft 36 is rotated to one end of the rotatable range, the feed dog 34 is positioned at the rear end of the feed dog hole 19. The cloth feed mechanism 30 is in the second state (see FIG. 3).

  The cloth feed motor 35 reverses the rotation direction of the drive shaft 36. The drive shaft 36 rotates counterclockwise as viewed from the left side. The feed arm 41 rotates counterclockwise as the drive shaft 36 rotates. The connecting portion 65 moves from the front position to the intermediate position. The feed arm 41 and the feed arm 42 are in a straight line in the vertical direction. The intermediate working arm 38 rotates clockwise about the horizontal feed shaft 28 and returns to substantially horizontal. In conjunction with the rotation of the intermediate working arm 38, the horizontal feed shaft 28 rotates clockwise. The link member 50 rotates clockwise in conjunction with the horizontal feed shaft 28. The feed base 33 moves forward. The feed dog 34 is located in the forefront of the feed dog hole 19. The cloth feed mechanism 30 returns to the first state (see FIG. 2).

  The drive shaft 36 continues to rotate counterclockwise as viewed from the left side from the first state. The feed arm 41 continues to rotate counterclockwise as the drive shaft 36 rotates. As shown in FIG. 6, the connecting portion 65 moves from the intermediate position to the rear position. The feed arm 41 and the feed arm 42 are bent in a substantially L shape toward the rear, which is the opposite side to the second state, with the connecting portion 65 as a base point. The feed arm 42 rotates clockwise around the connecting portion 65. The connecting portion 66 moves downward by the rotation of the feed arm 42. The connecting portion 66 pulls the tip of the intermediate working arm 38 downward. The intermediate working arm 38 rotates counterclockwise about the horizontal feed shaft 28 and the tip thereof is inclined obliquely downward. In conjunction with the rotation of the intermediate action arm 38, the horizontal feed shaft 28 rotates counterclockwise. The link member 50 rotates counterclockwise in conjunction with the horizontal feed shaft 28. The feed base 33 moves backward. When the drive shaft 36 is rotated to the other end of the rotatable range, the feed dog 34 is positioned at the rear end of the feed dog hole 19. The cloth feed mechanism 30 is in the third state (see FIG. 4).

  The cloth feed motor 35 reverses the rotation direction of the drive shaft 36. The drive shaft 36 rotates clockwise. The feed arm 41 rotates clockwise as the drive shaft 36 rotates. The connecting portion 65 moves from the rear position to the intermediate position. The feed arm 41 and the feed arm 42 are in a straight line in the vertical direction. The intermediate working arm 38 rotates clockwise about the horizontal feed shaft 28 and returns to substantially horizontal. In conjunction with the rotation of the intermediate working arm 38, the horizontal feed shaft 28 rotates clockwise. The link member 50 rotates clockwise in conjunction with the horizontal feed shaft 28. The feed base 33 moves to the forefront. The feed dog 34 is located in the forefront of the feed dog hole 19. The cloth feed mechanism 30 returns to the first state (see FIG. 2). The cloth feed mechanism 30 repeats the first to third states and moves the feed base 33 in the front-rear direction.

  An operation in which the cloth feeding mechanism 30 feeds the cloth backward will be described. The cloth feed mechanism 30 feeds the cloth by the repetition of the first to third states by driving the cloth feed motor 35 and the vertical movement of the feed base 33 by driving the main motor 13 described above. When the cloth feed mechanism 30 is in the first state (see FIG. 2), the feed base 33 is located at a position where the feed dog 34 substantially coincides with the upper surface of the needle plate 15 by the eccentric portion 39 and the link member 51.

  When the main motor 13 is driven, the feed base 33 is moved upward by the eccentric portion 39 and the link member 51, and the feed dog 34 protrudes upward from the upper surface of the needle plate 15. The cloth feed motor 35 rotates the drive shaft 36 clockwise in a left side view. The feed base 33 is moved backward by the power transmission mechanism 40. Therefore, the cloth feed mechanism 30 feeds the cloth backward.

  When the main motor 13 continues to drive, the feed base 33 returns to the position where the feed dog 34 substantially coincides with the upper surface of the needle plate 15 by the eccentric portion 39 and the link member 51. In the cloth feed mechanism 30, the drive shaft 36 of the cloth feed motor 35 is rotated clockwise to one end of the rotation range to be in the second state (see FIG. 3). The cloth feed mechanism 30 stops feeding the cloth.

  After the second state, the feed base 33 is moved downward by the eccentric portion 39 and the link member 51, and the feed dog 34 is lowered downward from the upper surface of the needle plate 15. The cloth feed motor 35 rotates counterclockwise as viewed from the left side by reversing the rotation direction of the drive shaft 36. The feed base 33 is moved forward by the power transmission mechanism 40. Since the feed dog 34 is lowered from the upper surface of the needle plate 15, the cloth feed mechanism 30 does not feed the cloth.

  When the main motor 13 continues to drive, the feed base 33 returns to the position where the feed dog 34 substantially coincides with the upper surface of the needle plate 15 by the eccentric portion 39 and the link member 51. Since the cloth feed motor 35 rotates the drive shaft 36 counterclockwise as viewed from the left side, the cloth feed mechanism 30 returns to the first state (see FIG. 2).

  After the first state, the feed base 33 is again moved upward by the eccentric portion 39 and the link member 51, and the feed dog 34 protrudes upward from the upper surface of the needle plate 15. In the cloth feed motor 35, the drive shaft 36 continues to rotate counterclockwise. The moving direction of the feed base 33 is switched from the front to the rear by the power transmission mechanism 40. The cloth feed mechanism 30 feeds the cloth backward again.

  When the main motor 13 continues to drive, the feed base 33 returns to the position where the feed dog 34 substantially coincides with the upper surface of the needle plate 15 by the eccentric portion 39 and the link member 51. In the cloth feed mechanism 30, the drive shaft 36 of the cloth feed motor 35 rotates counterclockwise to the other end of the rotation range to be in the third state (see FIG. 4). The cloth feed mechanism 30 stops feeding the cloth.

  After the third state, the feed base 33 is moved downward by the eccentric portion 39 and the link member 51, and the feed dog 34 is lowered downward from the upper surface of the needle plate 15. The cloth feed motor 35 rotates clockwise by reversing the rotation direction of the drive shaft 36. The feed base 33 is moved forward by the power transmission mechanism 40. Since the feed dog 34 is lowered from the upper surface of the needle plate 15, the cloth feed mechanism 30 does not feed the cloth.

  When the main motor 13 continues to drive, the feed base 33 returns to the position where the feed dog 34 substantially coincides with the upper surface of the needle plate 15 by the eccentric portion 39 and the link member 51. Since the cloth feed motor 35 rotates the drive shaft 36 clockwise, the cloth feed mechanism 30 returns to the first state. The cloth feeding mechanism 30 repeats the above-described operation and feeds the cloth backward.

  As described above, the cloth feeding mechanism 30 feeds the cloth. When the rotation range of the drive shaft 36 of the cloth feed motor 35 is reduced, the cloth feed amount is reduced. When the rotation range of the drive shaft 36 of the cloth feed motor 35 is increased, the cloth feed amount is increased. Therefore, the CPU 44 (see FIG. 5) can adjust the cloth feed amount only by changing the rotation range of the drive shaft 36 of the cloth feed motor 35.

  The electrical configuration of the sewing machine 1 will be described with reference to FIG. The control device 25 of the sewing machine 1 includes a CPU 44. The CPU 44 controls the sewing machine 1. The CPU 44 is connected to a ROM 45, a RAM 46, an EEPROM (registered trademark) 49, and an I / O interface (hereinafter referred to as I / O) 48 via a bus. The ROM 45 stores a program for executing processing of various flowcharts to be described later. The RAM 46 temporarily stores various values necessary for executing the program. The EEPROM 49 is a nonvolatile storage device that stores sewing data 81 to 85 (see FIGS. 6, 11, 15, 17, and 20), which will be described later, and various values.

  The I / O 48 is connected to the pedal 22 and the operation unit 10. The CPU 44 acquires the operation direction and the operation amount of the pedal 22. The CPU 44 acquires a user operation instruction from the operation unit 10. The user can set sewing data by operating the operation unit 10 while confirming an input screen 95 (see FIG. 7) described later. The I / O 48 is connected to the drive circuits 52-55. The drive circuit 52 drives the liquid crystal panel 11. The drive circuit 53 drives the main motor 13 in accordance with a torque command signal input from the CPU 44. The sewing machine 1 includes a main encoder 57 for detecting a rotation angle phase and a rotation speed of the main motor 13. The main encoder 57 outputs the detection result of the rotation angle phase and rotation speed of the main motor 13 to the I / O 48. The drive circuit 54 drives the cloth feed motor 35 in accordance with the cloth feed drive signal input from the CPU 44. The CPU 44 controls the rotation of the drive shaft 36 of the cloth feed motor 35 and adjusts the cloth feed amount. The cloth feed motor 35 is a pulse motor. The cloth feed driving signal of the cloth feed motor 35 is a pulse signal. The sewing machine 1 includes a cloth feed encoder 58 for detecting the rotation angle phase and the rotation speed of the cloth feed motor 35. The cloth feed encoder 58 outputs the detection result of the rotation angle phase and the rotation speed of the cloth feed motor 35 to the I / O 48. The drive circuit 55 drives the thread tension solenoid 59 in accordance with a thread tension mechanism drive signal input from the CPU 44. The CPU 44 controls the drive amount of the thread tension solenoid 59 and adjusts the tension value to the upper thread by a thread tension mechanism (not shown).

  The sewing data 81 will be described with reference to FIG. The EEPROM 49 stores sewing data 81. The sewing data 81 is sewing data set by the user in accordance with sewing data creation processing (see FIG. 8) described later. The CPU 44 performs sewing in the order indicated by the sewing order. In FIG. 6, for the convenience of explanation, the sewing order is indicated by a combination of alphabets and numerical values such as “A1” and “A2”, but only numerical values may be used. The numerical value indicates the sewing order. The alphabet is used to distinguish the sewing order of various sewing data 81 to 85 (see FIGS. 6, 11, 15, 17, and 20).

  The CPU 44 performs sewing according to the sewing data 81. The sewing data 81 associates each data of the sewing order, the number of stitches, the feed amount, the feed direction, and the tension value. The number of stitches is the number of stitches (number of times) for continuous sewing. The feed amount is an amount for feeding the cloth for each stitch. The CPU 44 controls the cloth feed motor 35 to feed the cloth for each stitch by the feed amount indicated by the feed amount data. The feeding direction is the direction in which the cloth is conveyed. The feeding direction “1” indicates that the cloth is fed backward. The feeding direction “2” indicates that the cloth is fed forward. The tension value is the tension value of the upper thread. The CPU 44 controls a thread tension solenoid 59 attached to a thread tension mechanism (not shown) to change the tension value of the upper thread. In the following description, when the sewing data 81 to 85 are not particularly specified, the sewing data is referred to as the respective sewing data.

  The input screen 95 will be described with reference to FIG. The CPU 44 displays an input screen 95 on the liquid crystal panel 11. The input screen 95 includes a set value input unit 951, a mode input unit 952, and a numerical value input unit 953. A set value input unit 951 is a display unit for selecting each data (number of stitches, feed amount, feed direction, tension value) to be registered in the sewing data. The user uses the set value input unit 951 to select the number of stitches, the feed amount, the feed direction, and the tension value, and inputs a numerical value to the numerical value input unit 953. The sewing data stores numerical values of the number of stitches, feed amount, feed direction, and tension value input by the user.

  The mode input unit 952 is a display unit for selecting normal sewing, front back sewing, back back sewing, program sewing, and pattern sewing. The user selects a mode when performing sewing. The normal sewing is a mode in which sewing is performed according to the amount of operation of the pedal 22 by the user. The front backtack is a backtack that is performed at the beginning of normal sewing. End backtack is backtack that is performed at the end of normal sewing. The front backtack and the back backtack can be additionally selected when the user selects normal sewing. Program sewing is a mode in which sewing is terminated when execution of sewing based on sewing data set by the user is completed. Pattern sewing is a mode in which sewing based on sewing data set by the user is repeatedly executed while the user operates the pedal 22.

  The sewing data creation process will be described with reference to FIG. The sewing data creation process is a process for the user to create sewing data. As shown in FIG. 8, the CPU 44 displays an input screen 95 (see FIG. 7) on the liquid crystal panel 11 (S11). The user operates the operation unit 10 while confirming the input screen 95 to create sewing data. The user sets the number of stitches, feed amount, feed direction, and tension value in units of one stitch.

  The CPU 44 determines whether or not the input has been completed (S12). When the input is not completed (S12: NO), the CPU 44 repeats the process of S12. The CPU 44 stores the feed amount set by the user's operation in the RAM 46 while repeating S12. When the input is completed (S12: YES), the CPU 44 stores the sewing data input by the user in the EEPROM 49 (S13). As a result, a feed amount for a plurality of stitches is set. The sewing data creation process ends.

  The sewing process will be described with reference to FIG. For example, the CPU 44 executes the sewing process when the user inputs an instruction to start sewing. The CPU 44 displays an input screen 95 (S21). The user operates the operation unit 10 to select a mode. The CPU 44 also displays a screen for selecting the sewing data stored in the EEPROM 49 after the user selects the mode. The user selects sewing data for sewing. The CPU 44 determines whether or not the input by the user is finished (S22). If the CPU 44 determines that the input has not ended (S22: NO), it repeats the process of S22.

  The CPU 44 determines whether or not the setting input in S22 is a setting for normal sewing (S23). When it is the setting of the normal sewing (S23: YES), the CPU 44 determines whether or not the setting input in S22 includes the setting of backtacking (front backtacking or backtacking) (S24). If there is no setting for backtacking (S24: NO), the CPU 44 executes the first normal sewing process (S25).

  The first normal sewing process will be described with reference to FIG. The first normal sewing process is a process for executing normal sewing without backtacking. The CPU 44 determines whether or not the pedal 22 is ON (S41). When the user operates the pedal 22, the pedal is turned on. When the pedal 22 is not ON (S41: NO), the CPU 44 repeats the process of S41. When the pedal 22 is ON (S41: YES), the CPU 44 executes sewing for one stitch according to the sewing data (S42). Specifically, the CPU 44 rotates the drive shaft 36 of the cloth feed motor 35 so that the cloth moves in the sewing data feed direction. The CPU 44 controls the cloth feed motor 35 to operate the power transmission mechanism 40 so as to feed the cloth with the feed amount of the sewing data. The CPU 44 controls the thread tension solenoid 59 so as to sew with the tension value of the sewing data. In the flowcharts (FIGS. 13, 16, and 19) to be described later, the CPU 44 performs the same processing when sewing is performed according to the sewing data.

  Next, the CPU 44 determines whether or not the pedal 22 is OFF (S43). When the user stops operating the pedal 22, the pedal 22 is turned off. When the pedal 22 is not OFF (S43: NO), the CPU 44 returns to S42 and performs sewing for the next stitch.

  For example, it is assumed that the user has set to perform normal sewing with the sewing data 82 shown in FIG. The sewing data 82 is set so that the feed amount differs for each stitch and is stored in the EEPROM 49. The CPU 44 executes sewing for one stitch in accordance with the sewing order of the sewing data 82. The CPU 44 repeatedly executes sewing in the sewing order “B1” and “B2” while the pedal 22 is ON (S42, S43: NO). FIG. 12 shows a sewing pattern when sewing is executed in this specific example. Symbols “B1” and “B2” in FIG. 12 indicate the lengths of stitches formed by sewing in the sewing order “B1” and “B2” of the sewing data 82 (see FIG. 11). In the sewing data 82, the feed amount in the sewing order “B1” is “0.5 mm”. The feed amount in the sewing order “B2” is “1 mm”. For this reason, in FIG. 12, the length of the stitch “B1” is half the length of the stitch “B2”. 14, 18, and 21 also show the length of the stitches and the sewing order, as in FIG. 12. The CPU 44 forms the stitches in the direction of the arrow 901. Therefore, the conveyance direction of the cloth is the opposite direction of the arrow 901. In FIG. 12, FIG. 14, FIG. 18, and FIG. 21, the difference between the stitches due to the difference in the tension value is not shown. However, if the tension value is different, the stitches to be formed also change.

  When the pedal 22 is OFF (S43: YES), the CPU 44 ends the first normal sewing process. The CPU 44 returns to the sewing process (see FIG. 9), and determines whether or not to switch the sewing data to other sewing data (S30). When the user inputs an instruction to switch the sewing data, the CPU 44 determines to switch the sewing data (S30: YES). The process returns to S21. The user can sew other patterns by switching the sewing data. Therefore, the sewing machine 1 can form stitches of various patterns on the cloth. When the user inputs an instruction not to switch the sewing data (S30: NO), the CPU 44 ends the sewing process.

  As shown in FIG. 9, when the CPU 44 determines that there is a setting for backtacking (S24: YES), it executes a second normal sewing process (S26). The second normal sewing process will be described with reference to FIG. The second normal sewing process is a process in the case where sewing is performed by combining a normal sewing with a stop stitch. The CPU 44 determines whether or not the pedal 22 is ON (S51). When the pedal 22 is not ON (S51: NO), the CPU 44 repeats the process of S51.

  When the pedal 22 is ON (S51: YES), the CPU 44 determines whether or not the front backtacking is set (S52). If there is no setting for the front backtack (S52: NO), the CPU 44 proceeds to S54 described later. When there is a setting of the front backtacking (S53: YES), the CPU 44 executes the front backtacking (S53). For example, it is assumed that the user sets sewing data 81 (see FIG. 6) as sewing data for front-end stitching. The CPU 44 performs sewing in the sewing order “A1” to “A6”. FIG. 14 shows a sewing pattern when sewing is executed in this specific example. As shown in FIG. 14, the CPU 44 performs sewing in the direction of the arrow 902 with the set stitch lengths in the order of the sewing orders “A1” to “A3”. In the sewing order “A4” to “A6”, since the feed direction is “2 (forward direction)”, the sewing is performed in the direction of the arrow 903. In this case, the cloth feeding direction is the opposite direction of the arrow 903. The CPU 44 sews the sewing order “A1 to A6, B1, B2, C1 to C6” in FIG. 14 on the same line of the cloth. However, for convenience of explanation, in FIG. 14, every time the cloth feeding direction is changed, the seam is shifted to the lower side (the same applies to FIG. 18).

  The CPU 44 performs sewing for one stitch of the sewing data selected by the user for normal sewing after performing the front backtacking (S54). The CPU 44 determines whether or not the pedal 22 is OFF (S55). When the pedal 22 is not OFF (S55: NO), the CPU 44 returns to S54 and performs the next stitch sewing. The processes of S54 and S55 are the same as the processes of S42 and S43 of the first normal sewing process (see FIG. 10). For example, it is assumed that the user sets sewing data 82 (see FIG. 11) as sewing data for normal sewing. In this case, as in the case shown in FIG. 12, the CPU 44 forms a repeated stitch in the sewing order “B1” and “B2” (see FIG. 14). The CPU 44 performs sewing in the direction of the arrow 904.

  When the pedal 22 is turned off (S55: YES), the CPU 44 determines whether there is a setting for back end stitching (S56). The CPU 44 ends the second normal sewing process when there is no setting of the back end sewing (S56: NO). If there is a setting for back end sewing (S56: YES), the CPU 44 executes the back end sewing.

  For example, it is assumed that the user sets sewing data 83 (see FIG. 15) as sewing data for end backtacking. The sewing data 83 is sewing data set by the user in accordance with the sewing data creation process (see FIG. 8). The CPU 44 performs sewing in the sewing order “C1” to “C6”. As shown in FIG. 14, the CPU 44 performs sewing in the direction of the arrow 905 with the set stitch length in the order of “C1” to “C3”. “C4” to “C6” are sewn in the direction of the arrow 906.

  When the end backtacking is finished, the CPU 44 finishes the second normal sewing process. The CPU 44 returns to the sewing process (see FIG. 9) and performs the process of S30.

  As shown in FIG. 9, when the normal sewing is not set (S23: NO), the CPU 44 determines whether or not the setting is programmed sewing (S27). When it is the setting of the program sewing (S27: YES), the CPU 44 executes the program sewing process (S28).

  The program sewing process will be described with reference to FIG. The program sewing process is a process for automatically ending sewing after executing sewing of sewing data programmed (set) by the user. The CPU 44 determines whether or not the pedal 22 is ON (S61). When the pedal 22 is not ON (S61: NO), the CPU 44 repeats the process of S61.

  When the pedal 22 is ON (S61: YES), the CPU 44 performs sewing for one stitch (S62). The CPU 44 determines whether or not the sewing has been executed up to the last stitch of the sewing data (S63). When the CPU 44 has not performed the sewing up to the last stitch (S63: NO), the CPU 44 returns to S62 and performs the sewing of the next stitch. When the CPU 44 executes the sewing up to the last stitch (S63: YES), the program sewing process is terminated. The CPU 44 returns to the sewing process (see FIG. 9) and performs the process of S30.

  For example, it is assumed that the user has set to perform program sewing using the sewing data 84 shown in FIG. The sewing data 84 is sewing data set by the user in accordance with the sewing data creation process (see FIG. 8). The CPU 44 executes sewing according to the sewing order of the sewing data 84 (S62). After executing the sewing to the last one stitch in the sewing order “D9” of the sewing data 84 (S63: YES), the CPU 44 ends the program sewing process. FIG. 18 shows a sewing pattern when program sewing is executed with the sewing data 84. As shown in FIG. 18, the CPU 44 performs sewing from the first stitch of the sewing data 84 in the sewing order “D1” and performs sewing up to the last one stitch in the sewing order “D9”. In the sewing data 84, the feeding direction of the sewing order “D1” to “D4” and the sewing order “D6” to “D9” is “1 (backward direction)”, and the feeding direction of D5 is “2 (forward direction)”. Is. Therefore, the CPU 44 performs sewing in the sewing order “D1” to “D4” in the direction of the arrow 907, then performs sewing in the sewing order “D5” in the direction of the arrow 908, and performs sewing in the direction of the arrow 909 “ D6 "to" D9 "are sewn.

  As shown in FIG. 9, when it is not the setting of program sewing (S27: NO), CPU44 performs a pattern sewing process (S29). The pattern sewing process will be described with reference to FIG. The pattern sewing process is a process of executing sewing by repeating sewing data set by the user.

  The CPU 44 determines whether or not the pedal is ON (S71). CPU44 repeats the process of S71, when a pedal is not ON (S71: NO). When the pedal is ON (S71: YES), the CPU 44 executes sewing for one stitch of the sewing data (S72). The CPU 44 determines whether or not the pedal is OFF (S73). The user turns off the pedal 22 when finishing the sewing. When the pedal is not OFF (S73: NO), the CPU 44 determines whether or not the sewing has been executed up to the last stitch of the sewing data (S74).

  When the CPU 44 has not executed the sewing for the last stitch (S74: NO), the CPU 44 returns to S72 and performs the sewing for the next stitch. When the CPU 44 executes the sewing up to the last stitch (S74: YES), the CPU 44 sets so as to repeatedly execute the sewing based on the sewing data (S75). The CPU 44 returns to S72 and executes sewing from the first stitch of the sewing data. That is, the CPU 44 repeatedly executes the control for operating the power transmission mechanism 40 with the feed amount based on the feed amount data registered in the sewing data (S75). In this case, the CPU 44 repeatedly performs sewing using the same feed amount data registered in the same sewing data. Therefore, compared with a case where the user resets one stitch at a time to create feed amount data and perform sewing, the user's work is reduced. Therefore, the efficiency of the sewing work is further improved.

  For example, it is assumed that the user has set to perform pattern sewing using the sewing data 85 shown in FIG. The sewing data 85 is sewing data set by the user in accordance with the sewing data creation process (see FIG. 8). The CPU 44 executes sewing according to the sewing order of the sewing data 85 (S72). When the CPU 44 executes the sewing up to the last stitch in the sewing order “E4” of the sewing data 85 (S74: YES), the CPU 44 sets the sewing based on the sewing data 85 to be repeatedly executed (S75). Therefore, the CPU 44 executes sewing from the sewing order “1” of the sewing data 85 (S72). As a result, the CPU 44 forms stitches in the direction of the arrow 910 as shown in FIG. In FIG. 21, the CPU 44 performs sewing by repeating the sewing data 85 three times. For this reason, in FIG. 21, the sewing order “E1” to “E4” is repeated three times. The CPU 44 repeats the sewing of the sewing data 85 while the pedal is ON (S73: NO).

  When the pedal 22 is turned off (S73: YES), the CPU 44 ends the pattern sewing process. The CPU 44 returns to the sewing process (see FIG. 9) and performs the process of S30.

  As described above, the CPU 44 performs processing in the present embodiment. In the present embodiment, the user can set the feed amount in units of one stitch (S12 and S13). Therefore, the range of sewing designs that can be set by the user is widened.

  The CPU 44 controls the cloth feed motor 35 so that the set feed amount is obtained. The driving of the cloth feed motor 35 is transmitted to the feed base 33 via a power transmission mechanism 40 connected to the drive shaft 36. In other words, unlike the prior art, it is not necessary to adjust the driving amount of the mechanism related to cloth feeding according to the inclination angle of the square piece. Therefore, the followability to the change to the feed amount set for each stitch is improved. Therefore, the CPU 44 can sew with high accuracy with the feed amount set in units of one stitch. The CPU 44 can perform sewing while dynamically changing the feed amount in units of one stitch.

  The feed amounts for a plurality of stitches including the feed amount set in units of one stitch can be combined into one feed amount data (feed amount data registered in the sewing data). In other words, the CPU 44 can use the feed amount data as a stitch pattern program. The CPU 44 performs sewing for a plurality of stitches while automatically adjusting the feed amount using the feed amount data set in this way (S42, S53, S54, S57, S62, S72). Therefore, the CPU 44 can sew together a plurality of stitches and improve the work efficiency of sewing.

  In the sewing data, the feed amount data is associated with the yarn tension value and the cloth feed direction data. Therefore, the sewing machine can perform sewing while adjusting not only the feed amount but also the tension value of the thread and the feed direction of the cloth. For this reason, the sewing machine can form stitches with more various designs.

  In the above embodiment, the cloth feed motor 35 corresponds to the “motor” of the present invention. The power transmission mechanism 40 corresponds to the “power mechanism” of the present invention. The CPU 44 that performs the process of setting the feed amount in one stitch unit in S12 and the process of storing the sewing data in S13 corresponds to the “data setting means” of the present invention. The CPU 44 that performs processing for controlling the cloth feed motor 35 in S42, S53, S54, S57, S62, and S72 corresponds to the “motor control means” of the present invention. After determining that the sewing data is to be switched in S30, the CPU 44 that performs the process of switching the sewing data in S22 corresponds to the “switching means” of the present invention. In S75 and S72, the CPU 44 that performs the process of repeatedly sewing the sewing data corresponds to the “repeating means” of the present invention.

  In addition, this invention is not limited to said embodiment, A various change is possible. For example, the feed amounts for a plurality of stitches are combined into one piece of sewing data for sewing, but the present invention is not limited to this. For example, the CPU 44 may perform sewing for one stitch immediately after the user has set the feed amount for one stitch and the like.

  In the sewing data, the feed direction data, the tension value, and the like are associated with the feed amount data. For example, the sewing data may be created by arranging only the feed amount data in the sewing order. Further, for example, at least one of the drive speed (rotational speed) of the main shaft 14, the tension value of the upper thread, and the feed direction may be associated with the feed amount data. In this case, the sewing machine 1 can adjust not only the feed amount but also at least one of the driving speed of the main shaft 14, the tension value of the thread, and the feed direction when performing sewing.

  In S12 and S13 of the sewing data creation process (see FIG. 8), one piece of sewing data is created using a plurality of feed amounts set for each stitch, but the present invention is not limited to this. For example, the CPU 44 may create one piece of sewing data by combining two pieces of sewing data. For example, in S12 and S13, the sewing data may be combined so that the sewing data 85 follows the sewing data 84. In this case, the CPU 44 combines the feed amount data of the sewing data 84 and the feed amount data of the sewing data 85. Thus, the user can perform sewing by combining various stitches by combining the sewing data (feed amount data). Therefore, the range of sewing designs that can be set by the user is further expanded. Further, compared to a case where the user resets one stitch at a time and creates sewing data (feed amount data), the user's work is reduced. Therefore, the efficiency of the sewing work is further improved.

  The sewing data creation process is performed by the CPU 44 of the sewing machine 1 creating the sewing data, but the present invention is not limited to this. For example, data creation means provided separately from the sewing machine 1 may create sewing data (feed amount data). This data creation means is a CPU provided in a device other than the sewing machine 1, such as a personal computer (hereinafter referred to as a PC) or a portable terminal. The CPU 44 of the sewing machine 1 may be able to acquire sewing data (feed amount data) created by a PC, a portable terminal, etc., and set sewing data (data such as a feed amount). For example, the sewing data is acquired by transferring the sewing data to the sewing machine 1 and storing it in the EEPROM 49 via a network such as wireless communication or a storage medium such as a USB memory. In this case, the sewing machine 1 can acquire the sewing data even if the sewing data (data such as the feed amount) is created by the data creating means. The CPU 44 performs sewing while automatically adjusting the feed amount. Therefore, the user can create sewing data (feed amount data) using not only the sewing machine but also other devices (PC, portable terminal, etc.). For this reason, user convenience is improved. In the case of this modification, the CPU 44 that performs processing for acquiring sewing data (feed amount data) from the data creation means corresponds to the “data setting means” of the present invention.

1 sewing machine 14 main shaft 33 feed base 34 feed dog 35 feed motor 36 drive shaft 44 CPU
49 EEPROM
40 Power transmission mechanism 81, 82, 83, 84, 85 Sewing data

Claims (7)

A motor that rotates the drive shaft;
A feed base for supporting a feed dog for transferring the cloth in a horizontal direction;
A power mechanism that is connected to the drive shaft and applies a horizontal movement to the feed base by driving the motor;
Data setting means for setting feed amount data in which the feed amount, which is the amount to transfer the cloth, is set in units of one stitch;
A sewing machine comprising: motor control means for controlling rotation of the drive shaft of the motor and operating the power mechanism with the feed amount based on the feed amount data set by the data setting means.   The sewing machine according to claim 1, wherein the data setting means sets the feed amount for a plurality of stitches including the feed amount set in units of one stitch as the feed amount data. A switching unit capable of switching the plurality of feed amount data set by the data setting unit;
The sewing machine according to claim 1, wherein the motor control unit operates the power mechanism with the feed amount based on the feed amount data switched by the switching unit.   The said data setting means can set the said feed amount data by acquiring the said feed amount data created by the data creation means which can create the said feed amount data, The said feed amount data can be set. The sewing machine according to any one of the above.   The sewing machine according to any one of claims 1 to 4, wherein the data setting means can set a plurality of the feed amount data as a single feed amount data.   6. The apparatus according to claim 1, further comprising a repeating unit that causes the motor control unit to repeatedly execute a control for operating the power mechanism at the feed amount based on the feed amount data set by the data setting unit. The sewing machine according to any one of the above.   The feed amount data set by the data setting means is associated with at least one of a driving speed of a spindle, a tension value of an upper thread, and a direction in which the cloth is conveyed. The sewing machine according to any one of 1 to 6.

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