Classifications

• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B19/00—Program-controlled sewing machines
  • D05B19/02—Sewing machines having electronic memory or microprocessor control unit
  • D05B19/12—Sewing machines having electronic memory or microprocessor control unit characterised by control of operation of machine
  • D05B19/16—Control of workpiece movement, e.g. modulation of travel of feed dog
• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B27/00—Work-feeding means
  • D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
  • D05B27/08—Work-feeding means with feed dogs having horizontal and vertical movements with differential feed motions
• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B27/00—Work-feeding means
  • D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
  • D05B27/06—Work-feeding means with feed dogs having horizontal and vertical movements arranged above and below the workpieces
• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B69/00—Driving-gear; Control devices
• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B69/00—Driving-gear; Control devices
  • D05B69/10—Electrical or electromagnetic drives
  • D05B69/12—Electrical or electromagnetic drives using rotary electric motors
• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B69/00—Driving-gear; Control devices
  • D05B69/30—Details

Definitions

• the technology disclosed in the present specification relates to a differential feed sewing machine.
• a differential feed sewing machine includes a main feed dog for feeding a lower fabric, an auxiliary feed dog for feeding the lower fabric, and an upper feed dog for feeding an upper fabric.
• the technology disclosed in the present specification is to easily set feed amounts in a differential feed sewing machine.
• the present specification discloses a differential feed sewing machine.
• the differential feed sewing machine includes a main feed dog configured to feed a lower fabric, an auxiliary feed dog configured to feed the lower fabric, an upper feed dog configured to feed an upper fabric, and a controller.
• the controller includes a sewing data obtaining unit configured to obtain sewing data including a lower fabric length, which indicates a length of the lower fabric, an upper fabric length, which indicates a length of the upper fabric, and a finished length, which indicates a target value of a length of a sewn product after the lower fabric and the upper fabric are sewn.
• the controller also includes a calculation unit configured to calculate a feed amount of the auxiliary feed dog and a feed amount of the upper feed dog relative to a feed amount of the main feed dog based on the sewing data.
• the controller also includes a control unit configured to control respective feeding operations of the main feed dog, the auxiliary feed dog, and the upper feed dog based on the feed amounts calculated by the calculation unit.
• feed amounts in a differential feed sewing machine can be easily set.
• FIG. 1 is a perspective view showing a sewing machine 1 according to an embodiment.
• FIG. 2 is a schematic diagram showing the sewing machine 1 according to an embodiment.
• FIG. 3 is a block diagram showing the sewing machine 1 according to an embodiment.
• the sewing machine 1 is an industrial sewing machine.
• the sewing machine 1 is a differential feed sewing machine.
• the sewing machine 1 is installed in a sewing factory.
• the sewing machine 1 includes a sewing machine frame 3, a needle bar 5, a thread take-up lever 6, a needle plate 7, a presser 8, a thread tensioner 9, a shuttle 10, a main feed dog 11, an auxiliary feed dog 12, an upper feed dog 13, a sewing machine motor 14, an adjustment motor 15, a sewing machine power transmission mechanism 16, a feed amount adjustment mechanism 17, a pedal 18, an operation panel 19, and a controller 20.
• the sewing machine frame 3 is installed on an upper surface of a sewing machine table 2.
• the sewing machine table 2 is supported on table legs.
• a chair is installed at the rear of the sewing machine table 2. An operator of the sewing machine 1 operates the sewing machine 1 while sitting on the chair.
• the needle bar 5 holds a sewing machine needle 4.
• the needle bar 5 reciprocates in an up-down direction.
• the needle bar 5 is supported by the sewing machine frame 3.
• the sewing machine needle 4 has a threading hole through which an upper thread passes.
• the sewing machine needle 4 holds the upper thread on an inner surface of the threading hole.
• the sewing machine needle 4 reciprocates in the up-down direction while holding the upper thread.
• the thread take-up lever 6 supplies the upper thread to the sewing machine needle 4.
• the thread take-up lever 6 reciprocates in the up-down direction.
• the thread take-up lever 6 is supported by the sewing machine frame 3.
• the thread take-up lever 6 reciprocates in the up-down direction while holding the upper thread.
• the thread take-up lever 6 has a holding hole through which the upper thread passes.
• the thread take-up lever 6 holds the upper thread on an inner surface of the holding hole.
• the thread take-up lever 6 feeds out or pulls up the upper thread used for sewing a sewing workpiece 40 by reciprocating in the up-down direction.
• the needle plate 7 supports the sewing workpiece 40 from below.
• the needle plate 7 supports the sewing workpiece 40 below the needle bar 5.
• the needle plate 7 is arranged below the needle bar 5.
• the sewing machine needle 4 held by the needle bar 5 and the needle plate 7 face each other.
• the needle plate 7 has a needle hole through which the sewing machine needle 4 can pass.
• the sewing machine needle 4, which penetrates the sewing workpiece 40 supported on the needle plate 7, passes through the needle hole.
• the presser 8 presses the sewing workpiece 40 supported on the needle plate 7 from above.
• the presser 8 is arranged at least partially around the sewing machine needle 4.
• the presser 8 is supported by the sewing machine frame 3.
• the thread tensioner 9 is provided between the thread take-up lever 6 and the needle bar 5 and applies tension to the upper thread supplied to the sewing machine needle 4.
• the thread tensioner 9 is supported by the sewing machine frame 3.
• the shuttle 10 supplies a lower thread to the sewing workpiece 40.
• the shuttle 10 is arranged lower than the needle plate 7.
• the shuttle 10 is rotatable.
• Each of the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 operates to feed the sewing workpiece 40 supported on the needle plate 7 forward or rearward.
• Each of the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 feeds the sewing workpiece 40 by moving along a predetermined feed path.
• Each of the main feed dog 11 and the auxiliary feed dog 12 is arranged below the needle plate 7.
• the upper feed dog 13 is arranged above the needle plate 7.
• Each of the main feed dog 11 and the auxiliary feed dog 12 protrudes from and retracts into an opening provided in the needle plate 7 as it moves along the feed path.
• each of the main feed dog 11 and the auxiliary feed dog 12 protrudes upward from an upper surface of the needle plate 7 through the opening provided in the needle plate 7.
• the sewing machine motor 14 generates power to operate the sewing machine power transmission mechanism 16.
• the adjustment motor 15 generates power to operate the feed amount adjustment mechanism 17.
• the sewing machine motor 14 includes a servo motor.
• the adjustment motor 15 includes a pulse motor.
• the sewing machine power transmission mechanism 16 operates each of the needle bar 5, the shuttle 10, the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 based on the power generated by the sewing machine motor 14.
• the sewing machine power transmission mechanism 16 transmits the power generated by the sewing machine motor 14 to each of the needle bar 5, the shuttle 10, the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13.
• the needle bar 5 reciprocates in the up-down direction by an operation of the sewing machine power transmission mechanism 16.
• the shuttle 10 rotates by the operation of the sewing machine power transmission mechanism 16 so that the lower thread is supplied to the sewing workpiece 40, in synchronization with the reciprocation of the needle bar 5 in the up-down direction.
• Each of the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 moves along the feed path to feed the sewing workpiece 40 by the operation of the sewing machine power transmission mechanism 16, in synchronization with the reciprocation of the needle bar 5 in the up-down direction.
• the sewing machine 1 sews the sewing workpiece 40 through cooperation between the sewing machine needle 4 held by the needle bar 5 and the shuttle 10.
• each of the needle bar 5, the shuttle 10, the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 may be operated based on the power generated by the sewing machine motor 14, or a motor for individually operating each of the needle bar 5, the shuttle 10, the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 may be provided in the sewing machine 1.
• the feed amount adjustment mechanism 17 changes at least one of a main feed amount Fm, which indicates a feed amount of the main feed dog 11, an auxiliary feed amount Fd, which indicates a feed amount of the auxiliary feed dog 12, and an upper feed amount Ft, which indicates a feed amount of the upper feed dog 13, based on the power generated by the adjustment motor 15.
• the main feed amount Fm is constant.
• the feed amount adjustment mechanism 17 changes at least one of the auxiliary feed amount Fd and the upper feed amount Ft relative to the main feed amount Fm based on the power generated by the adjustment motor 15.
• the pedal 18 is operated by the operator of the sewing machine 1.
• the operator operates the pedal 18 with a foot.
• the sewing machine motor 14 is driven or stopped based on an operating state of the pedal 18.
• An operating signal generated as a result of the pedal 18 being operated is transmitted to the controller 20.
• the operation panel 19 includes a flat-panel display and a touch panel.
• the operation panel 19 functions as a display device and an input device.
• the operation panel 19 is operated by the operator of the sewing machine 1.
• the operation panel 19 is provided on the sewing machine frame 3.
• the operator operates the operation panel 19 with a finger.
• An input signal generated as a result of the operation panel 19 being operated is transmitted to the controller 20.
• the controller 20 includes a computer system.
• the controller 20 outputs control commands for controlling each of the sewing machine motor 14 and the adjustment motor 15.
• the controller 20 can communicate with an external computer 31 via a communication system 30.
• the external computer 31 include a personal computer.
• Examples of the communication system 30 include the Internet, a mobile phone communication network, a satellite communication network, or a local area network (LAN).
• the external computer 31 may be installed in the sewing factory where the sewing machine 1 is installed, or may be installed outside the sewing factory.
• sewing data which indicates sewing conditions of the sewing machine 1 is generated.
• the sewing data generated in the external computer 31 is transmitted to the controller 20 via the communication system 30.
• the controller 20 controls the sewing machine motor 14 based on the operation signal from the pedal 18.
• the controller 20 drives the sewing machine motor 14.
• the sewing machine motor 14 As the sewing machine motor 14 is driven, the sewing workpiece 40 is sewn.
• the controller 20 stops the sewing machine motor 14.
• the controller 20 sets the auxiliary feed amount Fd and the upper feed amount Ft relative to the main feed amount Fm based on the sewing data from the external computer 31.
• the controller 20 controls the adjustment motor 15 based on the set feed amounts (Fm, Fd, and Ft).
• the controller 20 controls the adjustment motor 15 so that at least one of the auxiliary feed amount Fd and the upper feed amount Ft relative to the main feed amount Fm changes, based on an input signal from the operation panel 19.
• FIG. 4 is a schematic diagram showing the needle plate 7, the presser 8, the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 according to an embodiment.
• the needle plate 7 supports the sewing workpiece 40 from below.
• the presser 8 presses the sewing workpiece 40 supported on the needle plate 7 from above.
• Each of the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 operates to feed the sewing workpiece 40 forward.
• the sewing workpiece 40 includes a lower fabric 41 and an upper fabric 42.
• the upper fabric 42 is arranged higher than the lower fabric 41.
• the presser 8 and the upper feed dog 13 are arranged higher than the upper fabric 42.
• the main feed dog 11 and the auxiliary feed dog 12 are arranged lower than the lower fabric 41.
• the auxiliary feed dog 12 is arranged rearward of the main feed dog 11.
• Each of the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 feeds the sewing workpiece 40 forward by moving along a predetermined feed path.
• Each of the main feed dog 11 and the auxiliary feed dog 12 is arranged lower than the sewing workpiece 40.
• the upper feed dog 13 is arranged higher than the sewing workpiece 40.
• the main feed dog 11 can come into contact with the lower fabric 41 from below the lower fabric 41 through the opening provided in the needle plate 7.
• the auxiliary feed dog 12 can come into contact with the lower fabric 41 from below the lower fabric 41 through the opening provided in the needle plate 7.
• the upper feed dog 13 can come into contact with the upper fabric 42 from above the upper fabric 42.
• the main feed dog 11 moves along a main feed path Rm, which indicates a feed path of the main feed dog 11, to feed the lower fabric 41 forward.
• the auxiliary feed dog 12 moves along an auxiliary feed path Rd, which indicates a feed path of the auxiliary feed dog 12, to feed the lower fabric 41 forward.
• the upper feed dog 13 moves along an upper feed path Rt, which indicates a feed path of the upper feed dog 13, to feed the upper fabric 42 forward.
• the main feed path Rm has a substantially elliptical shape that is long in a front-rear direction. Note that the main feed path Rm may have a rectangular shape that is long in the front-rear direction.
• the main feed path Rm includes a start position Sm and an end position Em of a feeding operation of the main feed dog 11.
• the start position Sm is defined rearward of the end position Em.
• the start position Sm is defined as a rear end portion of the main feed path Rm.
• the end position Em is defined as a front end portion of the main feed path Rm.
• the main feed path Rm includes a forward path along which the main feed dog 11 moves from the start position Sm to the end position Em, and a return path along which the main feed dog 11 moves from the end position Em to the start position Sm.
• the main feed dog 11 moves from the start position Sm to the end position Em while in contact with the lower fabric 41.
• the main feed dog 11 protrudes upward from the opening provided in the needle plate 7, thereby coming into contact with the lower fabric 41.
• the main feed dog 11 moves from the end position Em to the start position Sm while being downwardly separated from the lower fabric 41.
• the main feed dog 11 moves below the needle plate 7.
• the auxiliary feed path Rd has a substantially elliptical shape that is long in a front-rear direction. Note that the auxiliary feed path Rm may have a rectangular shape that is long in the front-rear direction.
• the auxiliary feed path Rd includes a start position Sd and an end position Ed of a feeding operation of the auxiliary feed dog 12.
• the start position Sd is defined rearward of the end position Ed.
• the start position Sd is defined as a rear end portion of the auxiliary feed path Rd.
• the end position Ed is defined as a front end portion of the auxiliary feed path Rd.
• the auxiliary feed path Rd includes a forward path along which the auxiliary feed dog 12 moves from the start position Sd to the end position Ed, and a return path along which the auxiliary feed dog 12 moves from the end position Ed to the start position Sd.
• the auxiliary feed dog 12 moves from the start position Sd to the end position Ed while in contact with the lower fabric 41.
• the auxiliary feed dog 12 protrudes upward from the opening provided in the needle plate 7, thereby coming into contact with the lower fabric 41.
• the auxiliary feed dog 12 moves from the end position Ed to the start position Sd while being downwardly separated from the lower fabric 41.
• the auxiliary feed dog 12 moves below the needle plate 7.
• the upper feed path Rt has a substantially elliptical shape that is long in a front-rear direction. Note that the upper feed path Rt may have a long rectangular shape that is long in the front-rear direction.
• the upper feed path Rt includes a start position St and an end position Et of a feeding operation of the upper feed dog 13.
• the start position St is defined rearward of the end position Et.
• the start position St is defined as a rear end portion of the upper feed path Rt.
• the end position Et is defined as a front end portion of the upper feed path Rt.
• the upper feed path Rt includes a forward path along which the upper feed dog 13 moves from the start position St to the end position Et, and a return path along which the upper feed dog 13 moves from the end position Et to the start position St. In the forward path, the upper feed dog 13 moves from the start position St to the end position Et while in contact with the upper fabric 42. In the return path, the upper feed dog 13 moves from the end position Et to the start position St while being upward
• the main feed amount Fm which indicates the feed amount of the main feed dog 11, is a distance between the start position Sm and the end position Em of the main feed path Rm in the front-rear direction.
• the auxiliary feed amount Fd which indicates the feed amount of the auxiliary feed dog 12, is a distance between the start position Sd and the end position Ed of the auxiliary feed path Rd in the front-rear direction.
• the upper feed amount Ft which indicates the feed amount of the upper feed dog 13, is a distance between the start position St and the end position Et of the upper feed path Rt in the front-rear direction.
• each of the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 moves along the forward path while in contact with the sewing workpiece 40.
• Each of the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 moves along the forward path while in contact with the sewing workpiece 40, so that the sewing workpiece 40 is fed forward.
• each of the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 moves along the return path while being separated from the sewing workpiece 40.
• the respective feeding operations of the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 are repeated, thereby forming stitches one by one in the sewing workpiece 40.
• FIG. 5 and FIG. 6 are diagram for describing a relationship among the main feed amount Fm, the auxiliary feed amount Fd, the upper feed amount Ft, and a sewn product 43 according to the embodiment.
• the sewn product 43 is produced by sewing the upper fabric 42 and the lower fabric 41.
• each of the upper fabric 42 and the lower fabric 41 is flat in the sewn product 43.
• the upper fabric 42 is flat and pleats are formed on the lower fabric 41 in the sewn product 43.
• the upper fabric 42 is flat and the lower fabric 41 is stretched in the front-rear direction in the sewn product 43.
• the lower fabric 41 is flat and the upper fabric 42 is stretched in the front-rear direction in the sewn product 43.
• each of the lower fabric 41 and the upper fabric 42 is stretched in the front-rear direction in the sewn product 43.
• An amount by which the lower fabric 41 is stretched in the front-rear direction is greater than an amount by which the upper fabric 42 is stretched in the front-rear direction.
• each of the lower fabric 41 and the upper fabric 42 is stretched in the front-rear direction in the sewn product 43.
• An amount by which the upper fabric 42 is stretched in the front-rear direction is greater than an amount by which the lower fabric 41 is stretched in the front-rear direction.
• FIG. 7 is a hardware configuration diagram showing the controller 20 according to an embodiment.
• the controller 20 includes a computer system 1000.
• the computer system 1000 includes a processor 1001 such as a central processing unit (CPU), a main memory 1002 including a nonvolatile memory such as a read only memory (ROM) and a volatile memory such as a random access memory (RAM), a storage 1003, and an interface 1004 including an input/output circuit.
• the functions of the controller 20 are stored in the storage 1003 as a computer program.
• the processor 1001 reads the computer program from the storage 1003, loads the computer program in the main memory 1002, and executes processing according to the computer program. Note that the computer program may be transmitted to the computer system 1000 via a network.
• FIG. 8 is a functional block diagram showing the controller 20 according to an embodiment.
• the controller 20 includes a sewing data obtaining unit 21, an input signal obtaining unit 22, a calculation unit 23, and a control unit 24.
• the sewing data obtaining unit 21 obtains sewing data indicating sewing conditions of the sewing machine 1.
• the sewing data obtaining unit 21 obtains the sewing data from the external computer 31.
• the sewing data includes a lower fabric length Ld, which indicates a length of the lower fabric 41, an upper fabric length Lt, which indicates a length of the upper fabric 42, and a finished length Lm, which indicates a target value of a length of the sewn product 43 after the lower fabric 41 and the upper fabric 42 are sewn.
• FIG. 9 is a diagram for describing sewing data according to an embodiment.
• the sewing data includes the lower fabric length Ld, which indicates a length of the lower fabric 41, the upper fabric length Lt, which indicates a length of the upper fabric 42, and the finished length Lm, which indicates a target value of a length of the sewn product 43 after the lower fabric 41 and the upper fabric 42 are sewn.
• the sewn product 43 is produced such that a position of one end portion of the lower fabric 41 matches a position of one end portion of the upper fabric 42 and a position of the other end portion of the lower fabric 41 matches a position of the other end portion of the upper fabric 42.
• the sewn product 43 is produced such that an actual sewn product length Lr, which indicates an actual length of the sewn product 43, matches the finished length Lm. That is, the sewn product 43 is produced such that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr and the finished length Lm match.
• FIG. 9 shows an example in which the combination of the main feed amount Fm, the auxiliary feed amount Fd, and the upper feed amount Ft is the second pattern.
• the upper fabric length Lt is longer than the lower fabric length Ld and the finished length Lm is equal to the lower fabric length Ld
• pleats are formed on the upper fabric 42 and the lower fabric 41 becomes flat so that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the input signal obtaining unit 22 obtains an input signal from the operation panel 19.
• the operation panel 19 functions as an input device.
• An input signal is generated as a result of the operation panel 19 being operated.
• the input signal obtaining unit 22 obtains the input signal generated as a result of the operation panel 19 being operated.
• the calculation unit 23 calculates the auxiliary feed amount Fd and the upper feed amount Ft relative to the main feed amount Fm based on the sewing data obtained by the sewing data obtaining unit 21 so that the actual sewn product length Lr becomes the finished length Lm.
• the calculation unit 23 selects the first pattern as a combination of the main feed amount Fm, the auxiliary feed amount Fd, and the upper feed amount Ft.
• the calculation unit 23 selects the second pattern as a combination of the main feed amount Fm, the auxiliary feed amount Fd, and the upper feed amount Ft so that pleats are formed on the upper fabric 42.
• the calculation unit 23 calculates the auxiliary feed amount Fd relative to the main feed amount Fm and the upper feed amount Ft relative to the main feed amount Fm so that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the calculation unit 23 selects the third pattern as a combination of the main feed amount Fm, the auxiliary feed amount Fd, and the upper feed amount Ft so that pleats are formed on the lower fabric 41.
• the calculation unit 23 calculates the auxiliary feed amount Fd relative to the main feed amount Fm and the upper feed amount Ft relative to the main feed amount Fm so that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the calculation unit 23 selects the fourth pattern as a combination of the main feed amount Fm, the auxiliary feed amount Fd, and the upper feed amount Ft so that pleats are formed on both the lower fabric 41 and the upper fabric 42.
• the calculation unit 23 calculates the auxiliary feed amount Fd relative to the main feed amount Fm and the upper feed amount Ft relative to the main feed amount Fm so that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the calculation unit 23 selects the fifth pattern as a combination of the main feed amount Fm, the auxiliary feed amount Fd, and the upper feed amount Ft so that the lower fabric 41 becomes stretched in the front-rear direction.
• the calculation unit 23 calculates the auxiliary feed amount Fd relative to the main feed amount Fm and the upper feed amount Ft relative to the main feed amount Fm so that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the calculation unit 23 selects the sixth pattern as a combination of the main feed amount Fm, the auxiliary feed amount Fd, and the upper feed amount Ft so that the upper fabric 42 becomes stretched in the front-rear direction.
• the calculation unit 23 calculates the auxiliary feed amount Fd relative to the main feed amount Fm and the upper feed amount Ft relative to the main feed amount Fm so that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the calculation unit 23 selects the seventh pattern as a combination of the main feed amount Fm, the auxiliary feed amount Fd, and the upper feed amount Ft so that pleats are formed on both the lower fabric 41 and the upper fabric 42.
• the calculation unit 23 calculates the auxiliary feed amount Fd relative to the main feed amount Fm and the upper feed amount Ft relative to the main feed amount Fm so that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the calculation unit 23 selects the eighth pattern as a combination of the main feed amount Fm, the auxiliary feed amount Fd, and the upper feed amount Ft so that pleats are formed on both the lower fabric 41 and the upper fabric 42.
• the calculation unit 23 calculates the auxiliary feed amount Fd relative to the main feed amount Fm and the upper feed amount Ft relative to the main feed amount Fm so that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the calculation unit 23 selects the ninth pattern as a combination of the main feed amount Fm, the auxiliary feed amount Fd, and the upper feed amount Ft so that pleats are formed on the upper fabric 42 and the lower fabric 41 becomes stretched in the front-rear direction.
• the calculation unit 23 calculates the auxiliary feed amount Fd relative to the main feed amount Fm and the upper feed amount Ft relative to the main feed amount Fm so that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the calculation unit 23 selects the tenth pattern as a combination of the main feed amount Fm, the auxiliary feed amount Fd, and the upper feed amount Ft so that pleats are formed on the lower fabric 41 and the upper fabric 42 becomes stretched in the front-rear direction.
• the calculation unit 23 calculates the auxiliary feed amount Fd relative to the main feed amount Fm and the upper feed amount Ft relative to the main feed amount Fm so that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the calculation unit 23 selects the eleventh pattern as a combination of the main feed amount Fm, the auxiliary feed amount Fd, and the upper feed amount Ft so that both the upper fabric 42 and the lower fabric 41 become stretched in the front-rear direction.
• the calculation unit 23 calculates the auxiliary feed amount Fd relative to the main feed amount Fm and the upper feed amount Ft relative to the main feed amount Fm so that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the calculation unit 23 selects the twelfth pattern as a combination of the main feed amount Fm, the auxiliary feed amount Fd, and the upper feed amount Ft so that both the upper fabric 42 and the lower fabric 41 become stretched in the front-rear direction.
• the calculation unit 23 calculates the auxiliary feed amount Fd relative to the main feed amount Fm and the upper feed amount Ft relative to the main feed amount Fm so that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the control unit 24 controls the respective feeding operations of the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 based on the feed amounts (Fm, Fd, and Ft) calculated by the calculation unit 23 so that the actual sewn product length Lr matches the finished length Lm.
• the control unit 24 controls the adjustment motor 15 so that the main feed dog 11 feeds the lower fabric 41 forward by the main feed amount Fm calculated by the calculation unit 23, the auxiliary feed dog 12 feeds the lower fabric 41 forward by the auxiliary feed amount Fd calculated by the calculation unit 23, and the upper feed dog 13 feeds the upper fabric 42 forward by the upper feed amount Ft calculated by the calculation unit 23.
• FIG. 10 is a diagram for describing a relationship between the actual sewn product length Lr and the finished length Lm according to the embodiment.
• the calculation unit 23 calculates the auxiliary feed amount Fd and the upper feed amount Ft relative to the main feed amount Fm based on the lower fabric length Ld, the upper fabric length Lt, and the finished length Lm such that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the control unit 24 controls the respective feeding operations of the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 based on the feed amounts (Fm, Fd, and Ft) calculated by the calculation unit 23. As shown in FIG.
• a deviation amount ⁇ La between a length of the lower fabric 41 and a length of the upper fabric 42 may increase, or an error ⁇ Lb between the actual sewn product length Lr and the finished length Lm may increase.
• trial sewing of the upper fabric 42 and the lower fabric 41 is performed based on the feed amounts (Fm, Fd, and Ft) calculated by the calculation unit 23.
• the deviation amount ⁇ La between the lower fabric 41 and the upper fabric 42 exceeds a first predetermined allowable value, or when the error ⁇ Lb between the actual sewn product length Lr and the finished length Lm exceeds a second predetermined allowable value, at least one of the auxiliary feed amount Fd and the upper feed amount Ft relative to the main feed amount Fm is corrected so that the deviation amount ⁇ La and the error ⁇ Lb are reduced.
• the operator of the sewing machine 1 operates the operation panel 19 to input the deviation amount ⁇ La and the error ⁇ Lb into the controller 20.
• the input signal obtaining unit 22 obtains input signals from the operation panel 19 indicating the deviation amount ⁇ La and the error ⁇ Lb.
• the calculation unit 23 based on the input signals from the operation panel 19 indicating the deviation amount ⁇ La and the error ⁇ Lb, corrects at least one of the auxiliary feed amount Fd and the upper feed amount Ft relative to the main feed amount Fm so that the deviation amount ⁇ La and the error ⁇ Lb are reduced.
• FIG. 11 is a diagram showing the operation panel 19 according to an embodiment.
• the operation panel 19 has a first display area 51 that displays the upper feed amount Ft calculated by the calculation unit 23, a second display area 52 that displays the main feed amount Fm calculated by the calculation unit 23, and a third display area 53 that displays the auxiliary feed amount Fd calculated by the calculation unit 23.
• the operation panel 19 has a first input area 54 to which the deviation amount ⁇ La is input, and a second input area 55 to which the error ⁇ Lb is input.
• the calculation unit 23 corrects the feed amounts (Fm, Fd, and Ft) so that the deviation amount ⁇ La and the error ⁇ Lb are each reduced.
• the upper feed amount Ft after correction is displayed in the first display area 51
• the main feed amount Fm after correction is displayed in the second display area 52
• the auxiliary feed amount Fd after correction is displayed in the third display area 53.
• FIG. 12 is a flow chart showing a sewing method according to an embodiment.
• the sewing data obtaining unit 21 obtains sewing data including the lower fabric length Ld, the upper fabric length Lt, and the finished length Lm from the external computer 31 (step S1).
• FIG. 13 is a schematic diagram showing sewing data according to an embodiment.
• the sewing data includes clothing design data.
• the clothing design data includes clothing CAD (Computer Aided Design) data.
• the lower fabric 41 is a back body of clothing
• the upper fabric 42 is a front body of the clothing.
• a peripheral edge portion of the lower fabric 41 and a peripheral edge portion of the upper fabric 42 are sewn by the sewing machine 1.
• the sewing data includes the lower fabric length Ld, which indicates a length of the peripheral edge portion of the lower fabric 41, the upper fabric length Lt, which indicates a length of the peripheral edge portion of the upper fabric 42, and the finished length Lm.
• the peripheral edge portion of the lower fabric 41 is divided into a plurality of portions, and the peripheral edge portion of the upper fabric 42 is divided into a plurality of portions.
• the peripheral edge portion of the lower fabric 41 is divided into three portions, and the peripheral edge portion of the upper fabric 42 is divided into three portions.
• Lengths of the first portion, the second portion, and the third portion of the lower fabric 41 are a lower fabric length Ld1, a lower fabric length Ld2, and a lower fabric length Ld3, respectively.
• Lengths of the first portion, the second portion, and the third portion of the upper fabric 42 are an upper fabric length Lt1, an upper fabric length Lt2, and an upper fabric length Lt3, respectively.
• the lower fabric length Ld is a sum of the lower fabric length Ld1, the lower fabric length Ld2, and the lower fabric length Ld3.
• the upper fabric length Lt is a sum of the upper fabric length Lt1, the upper fabric length Lt2, and the upper fabric length Lt3.
• the first portion of the lower fabric 41 and the first portion of the upper fabric 42 are sewn.
• the second portion of the lower fabric 41 and the second portion of the upper fabric 42 are sewn.
• the third portion of the lower fabric 41 and the third portion of the upper fabric 42 are sewn.
• the sewing data includes the lower fabric length Ld1, the lower fabric length Ld2, the lower fabric length Ld3, the upper fabric length Lt1, the upper fabric length Lt2, the upper fabric length Lt3, a finished length Lm1 after the first portion of the lower fabric 41 and the first portion of the upper fabric 42 are sewn, a finished length Lm2 after the second portion of the lower fabric 41 and the second portion of the upper fabric 42 are sewn, and a finished length Lm3 after the third portion of the lower fabric 41 and the third portion of the upper fabric 42 are sewn.
• the calculation unit 23 calculates the auxiliary feed amount Fd and the upper feed amount Ft relative to the main feed amount Fm based on the sewing data obtained in step S1 (step S2).
• the control unit 24 sews the lower fabric 41 and the upper fabric 42 while controlling the respective feeding operations of the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 based on the feed amounts (Fm, Fd, and Ft) calculated in step S2 (step S3).
• the sewing in step S3 is a trial sewing.
• the operator of the sewing machine 1 measures the deviation amount ⁇ La and the error ⁇ Lb.
• the deviation amount ⁇ La exceeds the first allowable value
• the operator operates the operation panel 19 to input the deviation amount ⁇ La to the controller 20.
• the error ⁇ Lb exceeds the second allowable value
• the operator the operation panel 19 to input the error ⁇ Lb to the controller 20.
• the calculation unit 23 determines whether the deviation amount ⁇ La and the error ⁇ Lb have been input (step S4).
• step S4 if it is determined that the deviation amount ⁇ La and the error ⁇ Lb are not input (step S4: No), the control unit 24 sews the lower fabric 41 and the upper fabric 42 while controlling the respective feeding operations of the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13 based on the feed amounts (Fm, Fd, and Ft) calculated in step S2 (step S5).
• the sewing in step S5 is an actual sewing.
• step S4 if it is determined that the deviation amount ⁇ La and error ⁇ Lb have been input (step S4: Yes), the calculation unit 23 corrects the feed amounts (Fm, Fd, and Ft) based on the deviation amount ⁇ La and the error ⁇ Lb (step S6).
• step S3 After the feed amounts (Fm, Fd, and Ft) are corrected, the processing returns to step S3.
• the processing of steps S3, S4, and S6 is repeated until the deviation amount ⁇ La and the error ⁇ Lb become small.
• the sewing machine 1 which is a differential feed sewing machine 1, includes the main feed dog 11 that feeds the lower fabric 41, the auxiliary feed dog 12 that feeds the lower fabric 41, the upper feed dog 13 that feeds the upper fabric 42, and the controller 20.
• the controller 20 includes the sewing data obtaining unit 21 that obtains sewing data including the lower fabric length Ld, which indicates the length of the lower fabric 41, the upper fabric length Lt, which indicates the length of the upper fabric 42, and the finished length Lm, which indicates a target value of the length of the sewn product 43 after the lower fabric 41 and the upper fabric 42 are sewn, the calculation unit 23 that calculates, based on the sewing data, the auxiliary feed amount Fd, which indicates the feed amount of the auxiliary feed dog 12, and the upper feed amount Ft, which indicates the feed amount of the upper feed dog 13, relative to the main feed amount Fm, which indicates the feed amount of the main feed dog 11, and the control unit 24 that controls the respective feeding operations of the main feed dog 11, the auxiliary feed dog 12, and the upper feed dog 13
• the controller 20 calculates the optimal feed amounts (Fm, Fd, and Ft) so that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the feed amounts (Fm, Fd, and Ft) in the sewing machine 1 are easily set.
• the sewing machine 1 includes the operation panel 19 that functions as an input device.
• the controller 20 includes the input signal obtaining unit 22 that obtains an input signal from the operation panel 19.
• the calculation unit 23 corrects the feed amounts (Fm, Fd, and Ft) based on the input signal so that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the feed amounts (Fm, Fd, and Ft) are corrected based on the input signal, and accordingly, the sewn product 43 is produced such that the positions of both end portions of the lower fabric 41 and the upper fabric 42 match and also the actual sewn product length Lr matches the finished length Lm.
• the operation panel 19 has the first display area 51 for displaying the upper feed amount Ft calculated by the calculation unit 23, the second display area 52 for displaying the main feed amount Fm calculated by the calculation unit 23, the third display area 53 for displaying the auxiliary feed amount Fd calculated by the calculation unit 23, the first input area 54 to which the deviation amount ⁇ La between the lower fabric length Ld and the upper fabric length Lt is input, and the second input area 55 to which the error ⁇ Lb between the actual sewn product length Lr and the finished length Lm is input.
• the calculation unit 23 corrects the feed amounts (Fm, Fd, and Ft) so that the deviation amount ⁇ La and the error ⁇ Lb are each reduced.
• the upper feed amount Ft after correction is displayed in the first display area 51
• the main feed amount Fm after correction is displayed in the second display area 52
• the auxiliary feed amount Fd after correction is displayed in the third display area 53.
• the operator of the sewing machine 1 can input the deviation amount ⁇ La and the error ⁇ Lb to the operation panel 19 when the deviation amount ⁇ La and the error ⁇ Lb are large. Additionally, the operator of the sewing machine 1 can check the feed amounts (Fm, Fd, and Ft) after correction displayed on the operation panel 19.
• the sewing data obtaining unit 21 obtains the sewing data from the external computer 31 via the communication system 30.
• the operator of the sewing machine 1 does not need to input the sewing data to the controller 20, so the burden on the operator is reduced.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Computer Hardware Design (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Sewing Machines And Sewing (AREA)

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Citations (5)

• 2024
  • 2024-03-21 JP JP2024044513A patent/JP2025144702A/ja active Pending
• 2025
  • 2025-03-20 EP EP25165180.8A patent/EP4621118A1/de active Pending
  • 2025-03-21 CN CN202510339360.2A patent/CN120683662A/zh active Pending

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