WO2010109773A1 - ミシン - Google Patents
ミシン Download PDFInfo
- Publication number
- WO2010109773A1 WO2010109773A1 PCT/JP2010/001367 JP2010001367W WO2010109773A1 WO 2010109773 A1 WO2010109773 A1 WO 2010109773A1 JP 2010001367 W JP2010001367 W JP 2010001367W WO 2010109773 A1 WO2010109773 A1 WO 2010109773A1
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- WIPO (PCT)
- Prior art keywords
- sewing
- needle bar
- needle
- free motion
- sewing machine
- Prior art date
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Classifications
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B3/00—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing
- D05B3/02—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing with mechanisms for needle-bar movement
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B19/00—Programme-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
- D05B19/14—Control of needle movement, e.g. varying amplitude or period of needle movement
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B47/00—Needle-thread tensioning devices; Applications of tensometers
- D05B47/04—Automatically-controlled tensioning devices
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B55/00—Needle holders; Needle bars
- D05B55/14—Needle-bar drives
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/14—Devices for changing speed or for reversing direction of rotation
- D05B69/18—Devices for changing speed or for reversing direction of rotation electric, e.g. foot pedals
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05C—EMBROIDERING; TUFTING
- D05C5/00—Embroidering machines with arrangements for automatic control of a series of individual steps
- D05C5/02—Embroidering machines with arrangements for automatic control of a series of individual steps by electrical or magnetic control devices
Definitions
- the present invention relates to a sewing machine capable of changing the swing width of a needle bar.
- This sewing machine capable of changing the swing width of the needle bar by switch operation when the sewing operation is stopped.
- This sewing machine has a bed portion, a pillar portion erected from the right end portion of the bed portion, and an arm extending leftward to face the bed portion from the upper end of the pillar portion.
- the bed unit includes a feed tooth for feeding the cloth, a needle bar for attaching a needle to the lower end of the head of the arm, a start / stop switch for instructing start and stop of the sewing operation, and various practicals on the front of the pillar.
- a display on which a pattern or an embroidery pattern, various function names and the like are displayed is provided.
- a connector jack is provided on the right side surface of the pillar, and a plug of a connection cord of a foot controller is connected to the connector jack (see, for example, Patent Document 1).
- the swing width of the needle bar can be changed by the switch operation of the user while the user is stopping the sewing operation.
- the foot controller is provided with a variable resistor. The user can instruct the microcomputer to start sewing by stepping on the foot controller with the legs. The sewing speed which is the lifting speed of the needle is adjusted by the stepping amount of the foot controller.
- a sewing machine in which a sewing machine motor, a speed control unit for driving and controlling the sewing machine motor, and a speed command element (foot controller) for supplying a speed command signal to the speed control unit are provided (for example, Reference 2).
- a sewing machine motor for driving and controlling the sewing machine motor
- a speed command element for supplying a speed command signal to the speed control unit
- the speed control unit receives a speed command voltage which is a speed command signal corresponding to the resistance value, and drives and controls the sewing machine motor so as to attain a sewing speed corresponding to the speed command voltage.
- the present invention has been made in view of the above problems, and it is possible to adjust the swing amount of a needle bar while performing sewing in free motion sewing, and to perform free motion sewing such as embroidery having a good appearance represented by satin stitch etc. It is an object of the present invention to provide an inexpensive and easy-to-use sewing machine that can
- the sewing machine has a needle bar on which a needle can be attached and which can be reciprocated in the vertical direction, a needle bar vertical movement mechanism for reciprocating the needle bar in the vertical direction,
- the needle bar swinging mechanism which swings the needle bar along the lateral direction, the operation of the needle bar vertical movement mechanism and the operation of the needle bar swinging mechanism are controlled, and in the free motion sewing mode, the needle bar swinging mechanism
- a controller configured to adjust an amount of swinging movement of the needle bar in the lateral direction. Since the needle is attached to the needle bar, the swinging of the needle bar can be replaced with the swinging of the needle.
- the control unit can adjust the swing amount of the needle bar while performing sewing in free motion sewing.
- the control unit executes the free motion sewing mode while the needle bar swinging mechanism performs the lateral direction (the longitudinal direction in which the cloth is fed with the feed teeth in linear stitching and The swing amount of the needle bar can be adjusted in the crossing direction). Therefore, while free motion sewing is performed, it is possible to adjust a swing amount amount in which the needle attached to the needle bar swings in the lateral direction. Therefore, when the user performs sewing such as embroidery on a sewing object such as cloth, the user can operate the sewing object such as cloth freely and easily by putting fingers of both hands on the sewing object such as cloth. . As a result, it is possible to provide a sewing machine capable of free motion sewing represented by embroidery such as well-made satin stitch embroidery.
- the expensive XY drive mechanism unit which moves the sewing object such as cloth as in the prior art in both the lateral direction (X direction) and the longitudinal direction (Y direction) becomes unnecessary. Therefore, it is possible to provide a low cost sewing machine capable of performing free motion sewing such as satin stitch embroidery represented by a user's favorite pattern or name. Furthermore, since free motion sewing is performed, the size or font of characters may be as the user desires, and favorite fonts can also be embroidered.
- FIG. 1 is a front view of a sewing machine according to a first embodiment. It concerns on Example 1, and is the elements on larger scale of the arm front.
- FIG. 2 is an enlarged perspective view of the vicinity of a needle according to the first embodiment.
- 1 relates to a first embodiment and is a front view showing an internal configuration of a sewing machine main body.
- FIG. 5 is an explanatory view according to Embodiment 1 and showing a configuration and operation of a foot controller.
- FIG. 5 is an explanatory diagram of input and output of a microcomputer provided in a sewing machine main body according to a first embodiment. It is a flowchart which concerns on Example 1 and shows control of a sewing machine.
- FIG. 12 is an explanatory diagram of input and output of a microcomputer provided in a sewing machine main body according to a second embodiment. It is a perspective view which shows an upper thread
- FIG. 16 is a front view of a sewing machine according to a fifth embodiment. FIG. 16 is a front view of the main part of a sewing machine according to a sixth embodiment. It is an expansion perspective view around a needle concerning other examples.
- 1 is a sewing machine main body
- 2 is a bed portion
- 8 is a changeover switch (switching element)
- 10 is a main body slide volume (adjustment switch)
- 11 is a needle bar
- 12 is a needle
- 13 is a pressing (pressing element)
- 14 is a needle plate 15 is a feed tooth
- 20 is a foot controller
- 30 is a microcomputer (control unit)
- 60 is a needle bar vertical movement mechanism
- 61 is a needle bar crank
- 62 is a crank rod
- 70 is a needle bar swing mechanism
- 71 is a swing Reference numeral 74 denotes a widthing rod
- 76 denotes a needle bar arm
- 100 denotes a sewing machine.
- the sewing machine of the present invention can adopt the following preferred embodiments (1) to (9).
- the sewing machine includes a foot controller that can be operated by the user with his or her foot.
- the control unit adjusts the swing amount of the needle bar in the lateral direction based on the operation of the foot controller in the free motion sewing mode. Therefore, the user can adjust the swing amount of the needle attached to the needle bar while performing free motion sewing.
- the user performs free motion sewing, and adjusts the operation of the foot controller to swing the needle bar in the lateral direction (direction intersecting the longitudinal direction of the feed teeth in linear sewing). You can adjust the width amount. Therefore, during sewing, it is possible to adjust the swing amount amount in which the needle attached to the needle bar swings along the lateral direction. In free motion sewing, it is preferable to invalidate the feed action of the feed dog.
- the control unit adjusts the lateral swing amount of the needle bar based on the operation of the foot controller while executing the free motion sewing mode in the free motion sewing mode.
- the swing amount of the needle bar is adjusted based on the operation amount of the foot controller.
- the foot controller adjusts the sewing speed at which the needle bar moves up and down, not the swing width of the needle bar, based on the operation of the foot controller. In this case, the sewing speed at which the needle bar and the needle move up and down is adjusted based on the operation amount of the foot controller.
- the sewing machine has a switching element.
- the switching element switches between a free motion sewing mode and a mode other than free motion sewing. That is, the switching element performs adjustment of the swing width of the needle bar in the lateral direction by the foot controller when executing the free motion sewing mode, and sewing in which the needle bar moves up and down when executing modes other than free motion sewing. Switch between adjusting the speed. This makes it possible to easily cope with modes other than free motion sewing. Since the adjustment of the swing amount of the needle bar and the adjustment of the sewing speed can be easily switched by this switching element, it is possible to provide a low-cost sewing machine that can be used easily and has good appearance such as satin stitch.
- the sewing machine has an adjustment switch for adjusting the sewing speed at which the needle bar moves up and down in the free motion sewing mode. Since the sewing speed at which the needle bar moves up and down is adjusted, free motion sewing is performed well.
- the sewing machine has an upper thread tension adjustment mechanism that applies tension to the upper thread supplied to the needle.
- the control unit outputs a command to apply tension to the upper thread during the sewing operation to the upper thread tension adjusting mechanism, and outputs a command to weaken the tension of the upper thread to the upper thread tension adjusting mechanism while the sewing operation is stopped. . Since the tension of the upper thread is weakened, movement of the sewing object such as cloth is permitted while the sewing operation is stopped. The reduction of tension also includes the release of tension.
- the sewing machine has an upper thread tension adjustment mechanism that applies tension to the upper thread supplied to the needle.
- the control unit performs the upper thread tension adjustment mechanism by the upper thread tension adjusting mechanism until a predetermined time ⁇ T elapses from the output of the sewing stop signal.
- the tension of the upper thread is weakened by the upper thread tension adjusting mechanism after a predetermined time ⁇ T has elapsed from the output of the sewing stop signal.
- ⁇ T is exemplified in the range of 0.5 to 2.0 seconds, particularly in the range of 1.0 to 1.5 seconds, but is not limited thereto.
- the foot controller has a first foot operating unit and a second foot operating unit.
- the control unit operates the first foot operating unit with a swing width amount in which the needle bar swings laterally by the needle bar swing mechanism. Adjust based on Further, in the free motion sewing mode, the control unit adjusts the sewing speed at which the needle bar moves up and down based on the operation of the second foot operating unit.
- the foot controller is operated by at least a part of the user's leg (foot, ankle, knee, shin, thigh, toe, etc.). Therefore, the foot controller is not limited to the system in which the user steps on the foot and can be operated in the knee and / or thighs of the user's leg.
- FIG. 1 is a front view of a sewing machine according to a first embodiment of the present invention.
- the sewing machine 100 includes a sewing machine body 1 and a foot controller 20 that functions as an operation controller that can be attached to and detached from the sewing machine body 1. Further, a plug (not shown) provided at one end of the connection cord 25 of the foot controller 20 is detachably connected to a jack 100a provided at the lower end of the right end surface of the pedestal 3 in FIG.
- the sewing machine main body 1 includes a bed 2, a pillar 3 standing from the right end of the bed 2 in FIG. 1, and an upper end side of the pillar 3 to an upper surface 2 a of the bed 2. And an oppositely extending arm 4.
- a start switch 6 is provided to control start and stop of the sewing operation.
- the selection mode display & selection switch 7, the changeover switch 8 (switching element) for switching and selecting the pattern number, etc., the rotational speed and pattern number etc. of the main shaft 53 (FIG. 4) are displayed.
- a seven-segment LED 9 display element
- a body slide volume 10 body slide volume 10 (sewing speed adjustment switch in free motion sewing) for sewing speed adjustment is provided.
- FIG. 2 shows a partially enlarged view of the front of the arm 4.
- the selection mode display & selection switch 7 instructs the 7-segment LED 9 to display contents, and the pattern number display & selection switch 7a, and the feed width display & It has a selection switch 7 b and a swing width display & selection switch 7 c of the needle 12.
- the keys of the display & selection switches 7a, 7b and 7c that function as switches that can be operated by the user are operated, the indicator lights 7a1, 7b1 and 7c1 are turned on to be in the on state, and the other switches are operated. Continue to turn on until. That is, only the changeover switch most recently pressed is turned on. As shown in FIG.
- the display portion D is formed by the indicator lights 7 a 1, 7 b 1, 7 c 1 and the 7-segment LED 9.
- the main body switch S is formed by the start switch 6, the selection mode display & selection switch 7, and the changeover switch 8 for selecting a pattern number or the like.
- the main body switch S is a switch operated by the user.
- FIG. 3 shows an enlarged perspective view around the needle 12 provided on the lower surface 5 a side of the head 5.
- the needle 12 attached to the tip of the needle bar 11, and the presser 13 (pressing element) which is detachable from the presser bar 90 and which can be raised and lowered integrally with the presser bar 90 It protrudes from the lower surface 5 a of the portion 5.
- the presser 13 moves in synchronization with the needle 12, holds the cloth just before the needle 12 pierces the cloth, keeps holding the cloth until the moment the needle 12 comes off the cloth, and immediately moves upward when the needle 12 is pulled. At this time, the user can freely move the cloth in the X direction and the Y direction (FIG. 3). Even when the presser 13 is removed, free motion sewing is possible. In this case, in order to prevent the uplifting of the cloth, the user may use a thread embroidery frame or work such as holding the cloth portion around the needle with a fingertip.
- FIG. 4 is a front view showing an internal configuration of the sewing machine main body 1 of FIG.
- the sewing machine shell 51 of the sewing machine main body 1 includes a machine frame 52 inside.
- the main shaft 53 is rotatably supported along a horizontal direction by a pair of bearings 54, 54 fixed to the machine frame 52.
- a hand wheel 55 and a pulley 56 are fixed.
- the pulley 56 has a large diameter driven pulley 56 a and a small diameter timing pulley 56 b.
- a spindle motor 59 (only a part of which is shown in FIG. 4), which is a main motor, is attached to the machine frame 52.
- a motor pulley 58 is fixed to the output shaft of the spindle motor 59.
- a lower shaft 67 having a timing pulley 67c is rotatably supported by a bearing 67a.
- An endless drive belt 57 is hooked on the motor pulley 58, the timing pulley 67c and the driven pulley 56a.
- the rotation of the main shaft motor 59 is decelerated to a predetermined speed reduction ratio (for example, about 1/9) by the drive belt 57 and transmitted to the main shaft 53 and the lower shaft 67.
- a tension pulley 68 is applied to the drive belt 57.
- a needle bar vertical movement mechanism 60 for reciprocating the needle bar 11 in the vertical direction is provided.
- a needle bar crank 61 is fixed to the other end of the main shaft 53 as is well known.
- the needle bar vertical movement mechanism 60 is composed of a needle bar crank 61 and a crank rod 62 connected to the needle bar crank 61.
- the needle 12 is fixed to the lower end of the needle bar 11 by a needle stopper 16.
- the needle 12 reciprocates in the vertical direction (Z direction) integrally with the needle bar 11.
- the upper end portion of the needle bar arm 76 is pivotally supported with the shaft 75 as a swing center, and the lower end portion of the needle bar arm 76 is made swingable in the lateral direction (X direction).
- the needle bar 11 is slidably supported by the needle bar arm 76 in the lateral direction (X direction).
- the needle bar swinging mechanism 70 for swinging the needle 12 in the lateral direction (X direction) is rotated by the swing width adjusting motor 71 formed of a stepping motor held by the machine frame 52 and the motor 71.
- a needle bar arm 76 pivotally supported by a shaft 75 in the lateral direction (X direction). That is, the small gear 72 is attached to the motor shaft of the swing width adjusting motor 71.
- the small gear 72 meshes with the sector gear 73 a of the width drive arm 73.
- One end 73 e of the width drive arm 73 is connected to one end 74 a of the widthing rod 74.
- the other end 74 c of the extension rod 74 is connected to the lower portion 76 d of the needle bar arm 76.
- the swing width adjustment motor 71 swings the needle bar 11 in the lateral direction (X direction) via the extending rod 74 by computer control in synchronization with the rotation of the main shaft 53. Based on the drive amount of the swing width adjustment motor 71, the swing amount of the needle bar 11 in the lateral direction (X direction) is determined.
- the sewing machine 100 has a foot controller 20 operated by the user with a leg.
- the foot controller 20 In the normal mode other than the free motion sewing, the foot controller 20 is used to adjust the sewing speed at which the needle bar 11 reciprocates in the vertical direction (Z direction). In the normal mode other than the free motion sewing, it is preferable to use the feed action of the feed dog 15.
- the foot controller 20 In the free motion sewing mode, the foot controller 20 is used to adjust the amount of swinging of the needle bar 11 in the X direction, and in turn is used to adjust the amount of swinging of the needle 12 in the X direction.
- the needle 12 is attached to the tip of the needle bar 11.
- the sewing speed and the swing amount of the needle bar 11 are equal to the sewing speed and the swing amount of the needle 12.
- the swing amount corresponds to the swing amount of the needle bar 11 and the needle 12 in the X direction.
- the sewing speed corresponds to the reciprocating movement speed of the needle bar 11 and the needle 12 in the vertical direction (Z direction), and corresponds to the rotational speed of the main shaft 53 (hereinafter also referred to as the main spindle rotational speed).
- the depression amount (operation amount) of the foot controller 20 corresponds to sewing speed adjustment in modes other than free motion sewing, and corresponds to adjustment of the swing width of the needle bar 11 in the X direction in free motion sewing.
- the switching between the free motion sewing mode and the other modes is performed by mode selection by the switch 8 (switching element) for selecting a pattern number or the like.
- the free motion sewing mode is selected only when the pattern mode switched to the changeover switch 8 is "satin name".
- an output signal when the foot controller 20 is stepped is a width adjustment signal for adjusting the swing width of the needle bar 11 and the needle 12 in the X direction.
- the output signal when the foot controller 20 is stepped is the Z direction of the needle bar 11 and the needle 12. It becomes a sewing speed adjustment signal for adjusting the sewing speed corresponding to the movement speed.
- FIG. 5 shows the operating principle of the foot controller 20.
- the foot controller 20 holds therein a variable resistor 24, a pedal 21 depressed by the leg of the user 2, a wiper 24b interlocked with the pedal 21, and a base for holding the variable resistor 24. 22, a pedal 21 for returning the pedal 21 to the original position, and a return spring 23 sandwiched between the base 22.
- a constant DC voltage is applied between the terminals P1 and P2 at both ends of the variable resistor 24.
- the moving contact point P of the wiper 24 b of the variable resistor 24 slides on the resistor 24 a based on the operation of the pedal 21.
- the dynamic contact point P is at the A position.
- the dynamic contact point P of the wiper 24b is separated from the resistor 24a between the A position and the B position, which is a position before the B position. It is a play section to the connection of the vessel 24.
- the B position is the connection start position of the variable resistor 24. Further, from the B position to the C position, the moving contact P of the wiper 24b slides on the resistor 24a.
- the depression amount (operation amount) of the pedal 21 is determined by the voltage value between the operating point P of the wiper 24b and the terminal P2.
- the output signal (analog signal) is input to the microcomputer 30 (control unit). Then, in the microcomputer 30, the output signal (stepped amount) of the foot controller 20 is A / D converted based on the A / D converted value (see Table 1) of the voltage value between the wiper 24b and the terminal P2.
- Table 1 shows the relationship (* 1) of the stepping amount (operation amount) of the foot controller 20 and the spindle rotational speed in modes other than free motion sewing. Furthermore, Table 1 shows the relationship (* 2) between the amount of depression (operation amount) in the free motion sewing mode and the amount of swing of the needle bar 11 in the X direction.
- the dynamic contact point P of the wiper 24b is not connected to the variable resistor 24 between the A position and the B position of the pedal 21. The connection of the dynamic contact point P is started at the B position. At the C position, the depression amount (operation amount) of the pedal 21 is maximized.
- the A / D converted values of the pedal 21 at the A position, the B position and the C position that is, the values calculated by the microcomputer 30 are 255, 200, 25 in relative indication, respectively. There is. However, it is not limited to this value.
- the depression amount between positions B to C is equally divided into a plurality (9 pieces).
- the A / D conversion values between the positions A and B and the positions B and C are set as shown in Table 1.
- the A / D conversion value is not limited to the values shown in Table 1.
- * 1 in Table 1 indicates modes other than satin stitch embroidery (normal modes other than free motion sewing).
- the spindle rotational speed at position B is set to, for example, 30 rpm based on the indicated value of the main body slide volume 10 of the main body switch S
- the spindle rotational speed at position C is, for example, 770 rpm. It is set.
- the amount of swinging of the needle bar 11 between positions B and C conforms to the indication value of the main body switch S of the sewing machine main body 1, and therefore the width of swinging is changed even if the stepping amount of the foot controller 20 is changed.
- the amount does not change.
- the presser 13 moves up and down in synchronization with the needle 12. In modes other than the free motion, as shown in FIG. 17, a presser 17X different from the presser 13 described above is used. In this case, the presser 13X is not synchronized with the needle 12.
- * 2 in Table 1 indicates a free motion sewing mode such as satin stitch embroidery.
- the swing amount of the needle bar 11 is set to 0.0 mm at the B position, and the swing amount of the needle bar 11 is set to 5.0 mm at the C position.
- the swing width of the needle bar 11 with respect to the A / D conversion value between the B to C positions is set as * 2 of Table 1.
- the main spindle rotational speed follows the indicated value of the main body slide volume 10 (adjustment switch) between the B and C positions.
- FIG. 6 is an explanatory view of the input / output of a microcomputer (hereinafter also referred to as a microcomputer) 30 mounted on the sewing machine main body 1.
- the sewing machine 100 internally includes a microcomputer 30 (control unit, hereinafter also referred to as a microcomputer).
- the main body switch S (FIG. 6, FIG. 1) is composed of the start switch 6, the switches 7a, 7b, 7c constituting the selection mode display & selection switch 7 and the changeover switch 8.
- a signal of each operation of each of the switches 6, 7a, 7b, 7c and the changeover switch 8 is input to the microcomputer 30.
- the microcomputer 30 processes based on the data stored in advance in the memory 30m.
- commands are output to the following parts corresponding to the processing result, that is, the display unit D, the spindle motor 59, and the swing width adjustment motor 71 (FIG. 6, FIG. 1).
- the display unit D is configured of the seven-segment LED 9 and the respective indicator lights 7a1, 7b1, 7c1 (see FIG. 2).
- the output signal from the foot controller 20 adjusts the swing angle of the swing width adjustment motor 71 and thus the lateral direction ( The swing width of the needle bar 11 and the needle 12 in the X direction can be adjusted.
- the rotational speed of the spindle motor 59 that is, the sewing speed at which the needle bar 11 and the needle 12 move up and down, is the adjustment knob 10a of the main slide volume 10 (adjustment switch). It is determined based on the adjustment position of In free motion sewing such as embroidery, in general, the cloth is fixed to the embroidery frame. In free motion sewing, it is preferable to invalidate the feed action of the feed dog 15. The invalidation can be performed, for example, by operating a drop feed knob (not shown) on the back of the bed 2 or placing an auxiliary plate (not shown) on the needle plate 14.
- the main body slide volume 10 adjusts the rotational speed of the main shaft 53, that is, the sewing speed.
- an output signal from the main body slide volume 10 is input to the microcomputer 30, the rotational speed of the spindle motor 59 is adjusted, and thereby the sewing speed at which the needle 12 moves up and down Adjusted.
- the foot controller 20 is connected to the sewing machine main body 1 and the mode other than the free motion sewing is selected, stepping on the foot controller 20 adjusts the sewing speed at which the needle 12 moves up and down.
- start and stop of the sewing machine main body 1 is based on the start switch 6, and adjustment of the sewing speed is based on the main body slide volume 10. If the foot controller 20 is not connected to the sewing machine main body 1, the "satin stitch embroidery mode" may not be selected by the mode selection by the changeover switch 8 for switching the pattern number etc. in order to prevent the user's mistake. . That is, the free motion sewing mode may not be selected.
- the foot controller 20 when the foot controller 20 is not connected to the sewing machine main body 1, the free motion sewing mode can not be selected, and modes other than the free motion sewing are executed.
- the foot controller 20 is used to adjust the sewing speed (vertical movement speed of the needle 12 in the Z direction) in the normal mode, and the needle bar 11 and the needle 12 in the X direction in the free motion sewing mode. Used for adjusting the swing width of the
- FIG. 7 shows an example of a flowchart showing the sewing operation of the sewing machine 100 of FIG.
- the flowchart is not limited to this.
- the sewing operation of the sewing machine 100 includes Step 1, Step 2, Step 3 N, Step 4 N, Step 3 Y, Step 4 Y, and Step 5.
- Step 1 the sewing operation of the sewing machine 100 includes Step 1, Step 2, Step 3 N, Step 4 N, Step 3 Y, Step 4 Y, and Step 5.
- the microcomputer 30 reads the main body switch S (specifically, the selection mode display & selection switch 7) operated by the user, and outputs a display signal to the display unit D accordingly. That is, when the user operates the pattern number display & selection switch 7a, the indicator lamp 7a1 lights up and the current pattern number is displayed on the 7-segment LED 9. When the user operates the feed width display & selection switch 7b, the indicator light 7b1 lights up and the feed width of the feed tooth 15 (FIG. 3) is displayed on the 7-segment LED 9. When the user operates the swing width display & selection switch 7c, the indicator light 7c1 lights up and the swing width of the needle 12 is displayed on the 7-segment LED 9. In addition, as a display of 7 segment LED9, the display of a spindle rotational speed can be prioritized.
- the display of a spindle rotational speed can be prioritized.
- the microcomputer 30 determines whether or not a satin stitch embroidery mode (free motion sewing mode) is selected.
- the microcomputer 30 reads the operation state of the changeover switch 8. Specifically, when the user operates the (+) key shown in FIG. 1 of the changeover switch 8 while the pattern number display & selection switch 7a is on, the pattern number is increased by one. When the user operates the (-) key, the pattern number is decremented by one. Thereby, one of the satin stitch embroidery mode (free motion sewing mode) and the mode other than the satin stitch embroidery mode (mode other than free motion sewing) is selected. If the satin stitch embroidery mode is selected, the microcomputer 30 proceeds to Step 3Y. If a mode other than the satin stitch embroidery mode is selected, the microcomputer 30 proceeds to Step 3N.
- Step 3Y numerical conversion processing of the foot controller 20 is executed based on the depression amount of the pedal 21 of the foot controller 20. That is, while the satin stitch embroidery mode is selected, the microcomputer 30 analog-to-digital converts the analog value of the depression amount of the pedal 21 corresponding to the swing width adjustment amount of the needle 12. Thereafter, the control of the microcomputer 30 proceeds to Step 4Y.
- Step 4 Y based on the A / D converted value of the depression amount of the pedal 21 and the data values (* 2 in Table 1) of Table 1 stored in advance in the memory 30 m of the microcomputer 30, the microcomputer 30 selects the needle 12. Determine the swing.
- the spindle rotational speed is determined by the command value of the adjustment knob 10a of the main slide volume 10 and the data stored in advance in the memory 30m of the microcomputer 30 (* 2 in Table 1). Then, the microcomputer 30 proceeds to Step 5.
- the command value of the swing width of the needle 12 determined by the microcomputer 30 at Step 4Y is input to the drive circuit of the swing width adjusting motor 71.
- the swing width adjustment motor 71 swings with a swing width amount according to the command value.
- the command value of the rotational speed of the spindle 53 determined by the microcomputer 30 is input to a drive circuit (not shown) of the spindle motor 59.
- the spindle motor 59 rotates at a rotational speed as instructed.
- the microcomputer 30 returns to Step 1.
- a cycle of satin stitch embroidery mode is made one after another to carry out satin stitch embroidery.
- the microcomputer 30 proceeds from Step 2 to Step 3N when a mode other than the satin stitch embroidery mode (a mode other than free motion sewing) is selected.
- Step 3N when the foot controller 20 is depressed, the sewing speed at which the needle 12 moves up and down is adjusted. That is, an analog value of the depression amount of the pedal 21 corresponding to the sewing speed adjustment amount is input to the microcomputer 30, and A / D conversion (* 1 in Table 1) is performed by the microcomputer 30.
- the microcomputer 30 proceeds to Step 4N.
- Step 4 N the spindle rotational speed is determined based on the A / D conversion value based on the depression amount of the pedal 21 and the data values (* 1 in Table 1) of Table 1 stored in advance in the memory 30 m of the microcomputer 30. Be done.
- the swing amount of the needle 12 follows the indication value of the main body switch S (specifically, the switch 7c and / or the changeover switch 8). In addition, when there is no increase / decrease by the main body switch S, the recommended value is set when the pattern is selected.
- the feed dog 15 is lowered from the groove 14a of the needle plate 14 to be ineffective.
- the presser 13 is attached to the sewing machine main body 1 so that sewing can be performed.
- the foot controller 20 is connected to the sewing machine body 1.
- the user turns on the pattern number display & selection switch 7a, and further operates the changeover switch 8 to select the satin stitch embroidery mode (free motion sewing mode).
- the selection result is displayed on the 7-segment LED 9 as a number.
- the sewing speed (corresponding to the spindle rotational speed) is adjusted by the user operating the adjustment knob 10a of the main body slide volume 10 (adjustment switch for adjusting the sewing speed in free motion sewing).
- a cloth (sewing target) is placed on the needle plate 14, and the user's hands are attached to the cloth.
- the user steps on the foot controller 20 with his / her feet, operates the cloth with both hands, executes free motion sewing, and adjusts the amount of stepping on the foot controller 20 so as to obtain the user's favorite swing width, and performs embroidery. Do.
- the presser 13 moves up and down in synchronization with the needle 12. As soon as the needle 12 comes out of the cloth, the presser 13 separates from the cloth. The user can freely move the cloth and sew a satin stitch pattern preferred by the user between the time immediately after the presser leaves 13 and the time immediately before the needle 12 pierces the cloth, that is, until the time the presser 13 depresses the cloth again. . In some cases, as described above, the presser 13 may be removed from the sewing machine. When it is necessary to adjust the sewing speed (spindle rotational speed) during such embroidery, the user operates the adjustment knob 10a of the main slide volume 10 for adjustment. At this time, the 7-segment LED 9 which is an element of the display section D displays the spindle rotational speed, that is, the sewing speed.
- the user performs free motion sewing and adjusts the stepping of the foot controller 20 to transverse the longitudinal direction (Y direction) to which the feed dog 15 sends in linear stitching.
- the swing amount of the needle bar 11 can be adjusted toward the (X direction). Therefore, the user can adjust the swing amount amount in which the needle 12 attached to the needle bar 11 swings in the lateral direction (X direction) while performing free motion sewing.
- free motion sewing for example, when embroidering a name etc., the user can sew embroidery of satin stitch by adjusting the swing amount of the needle 12 while putting a hand on the cloth and operating the cloth. .
- the expensive XY drive mechanism unit for moving the cloth in both the lateral direction (X direction) and the longitudinal direction (Y direction) is not necessary. Therefore, it is possible to provide an inexpensive sewing machine capable of embroidering satin stitches such as user's favorite patterns and names. Furthermore, since free motion sewing is performed, the size and font of characters to be embroidered can be embroidered as desired by the user, and any font can be embroidered. For this reason, purchase of favorite font data becomes unnecessary.
- the sewing machine 100 is provided with the foot controller 20, and by depressing the pedal 21 of the foot controller 20, that is, by operating it, it is possible to adjust the swing amount of the needle 12 in the lateral direction. Therefore, at the time of embroidery, the user can put fingers of both hands on the cloth and can operate the cloth freely and easily, so satin stitch embroidery with good quality can be performed.
- the sewing machine provided with the foot controller 20 according to the prior art, only the sewing speed (spindle rotational speed) can be adjusted by the depression amount of the foot controller 20.
- the adjustment of the sewing speed of the needle 12 in the normal mode and the adjustment of the swing amount of the needle 11 in the lateral direction in free motion sewing are selected.
- the changeover switch 8 switching element which can be provided is provided. This changeover switch 8 allows easy switching between adjustment of the swing amount of the needle 12 and adjustment of the sewing speed, so that it is easy to use and has a good appearance and inexpensive sewing machine capable of executing free motion sewing such as satin stitch embroidery. We can provide 100.
- FIG. 9 shows an upper thread tension adjusting mechanism 81 that applies tension to the upper thread supplied to the needle 12.
- the mechanism 81 is mounted on the machine frame 52 of the sewing machine main body 1 and meshes with a motor 82 formed of a stepping motor, a pinion 83 held by the motor shaft of the motor 82, and a pinion 83
- a drive arm 84x having rack teeth 84c and pivotally supported in the direction of arrow W via a pivot shaft 84, a rod 85 having one end 85a engaged with the drive arm 84x, and the other end of the rod 85
- the movement arm 86 which can be rocked in the directions of arrows E1 and E2 via the pivot shaft 86m while the portion 85c is engaged, the thread tension plate 89 having the first plate 87 and the second plate 88, and the first plate 87 Is biased toward the second plate 88 to close the thread tension plate 89,
- the rod 85 When the motor 82 rotates in one direction, the rod 85 is moved in the arrow F1 direction by the pinion 83 and the drive arm 84x. When the motor 82 rotates in the other direction, the rod 85 moves in the direction of the arrow F2 by the pinion 83 and the drive arm 84x.
- the motion arm 86 moves in the arrow E1 direction to bias the one end 87a of the first plate 87. Then, the other end 87c of the first plate 87 is lifted from the second plate 88, the tension plate 89 is released, and the tension of the upper thread is weakened.
- the microcomputer 30 (control unit) outputs a command to apply tension to the upper thread during the sewing operation to the motor 82 of the upper thread tension adjusting mechanism 81, and a command to reduce the tension of the upper thread as the sewing operation is stopped. It outputs to the motor 82 of the adjustment mechanism 81. Since the upper thread tension is weakened while the sewing operation is stopped, the user can easily move the cloth to change the sewing position of the cloth, and the needle drop position can be easily changed.
- the upper thread tension adjusting mechanism 81 is controlled by the microcomputer 30.
- FIG. 10 shows a flowchart showing control processing associated with the sewing operation of the sewing machine 100.
- the control process is repeatedly executed by the microcomputer 30 when the power of the sewing machine 100 is turned on, and is stopped when the power is turned off.
- the microcomputer 30 performs mode switching input processing for recognizing the mode selected by the switch 8 functioning as a switching element.
- the microcomputer 30 outputs a control signal for displaying a number or mode name corresponding to the selected mode to the indicator lights 7a1, 7b1 and 7c1.
- step SB2 the microcomputer 30 determines whether the mode selected by the changeover switch 8 is an embroidery mode which is free motion sewing.
- the mode selected by the changeover switch 8 is an embroidery mode which is free motion sewing.
- three patterns of left baseline mode, center baseline mode and right baseline mode, and sewing mode 17 patterns other than free motion embroidery mode are stored in memory 30 m of microcomputer 30 in advance. It is done.
- the microcomputer 30 proceeds to step SB3. If a mode other than the free motion sewing embroidery mode is selected (NO in step SB2), the microcomputer 30 proceeds to step SB10 described later.
- step SB3 the microcomputer 30 determines whether a sewing start signal from the foot controller 20 or the start switch 6 is input.
- the microcomputer 30 determines whether or not the sewing start signal is input from the foot controller 20
- the microcomputer 30 causes the voltage value between the moving contact P of the wiper 24b of the foot controller 20 and the terminal P2 to be the microcomputer 30. It is determined whether or not it has been input. If the sewing start signal is input (YES in step SB3), the process proceeds to step SB4. If the sewing start signal is not input (NO in step SB3), the process returns.
- step SB4 the microcomputer 30 outputs a command to close the thread tension disc 89 by the operation of the motor 82 of the upper thread tension adjusting mechanism 81 stored inside the sewing machine main body 1.
- the microcomputer 30 outputs a signal for performing a sewing operation start process to start the sewing operation to the spindle motor 59 and the swing width adjustment motor 71.
- the microcomputer 30 determines the rotation speed of the spindle motor 59 based on the input signal from the main body slide volume 10 (* 2 in Table 1), and the needle bar based on the stepping signal from the foot controller 30.
- the rotation amount (* 2 in Table 1) of swing width adjustment motor 71 of swing mechanism 70 is determined, and the signal is output to spindle motor 59 and swing width adjustment motor 71.
- the microcomputer 30 determines whether the sewing stop signal from the foot controller 20 or the start switch 6 is input during the sewing operation (step SB6). For example, when judging whether or not the sewing stop signal is input from the foot controller 20, the microcomputer 30 determines whether the dynamic contact point P of the wiper 24b of the foot controller 20 is detached from the resistor 24a and the voltage value is input. Judge whether or not. If the sewing stop signal is input (YES in step SB6), the process proceeds to step SB7. In step SB7, the microcomputer 30 outputs a signal for stopping the sewing operation to the spindle motor 59 and the swing width adjustment motor 71.
- the microcomputer 30 when stopping the sewing operation, the microcomputer 30 stops the spindle motor 59 and the swing width adjustment motor 71 rapidly without stopping the spindle motor 59 and the swing width adjustment motor. It is preferable to output the sewing movement amount of 71.
- the microcomputer 30 operates the upper thread tension adjusting mechanism 81 to output a signal for opening the thread tension disc 89 (step SB9). Thereby, the tension of the upper thread supplied to the needle 12 is weakened. Since the tension of the upper thread supplied to the needle 12 is weakened, when continuing the sewing in the embroidery mode which is free motion sewing, the user longitudinally and laterally of the cloth on the upper surface 2a of the bed 2 Can move freely to both sides, and can freely change the needle drop position on the cloth.
- step SB6 When the sewing stop signal is not input (NO in step SB6), the microcomputer 30 proceeds from step SB6 to step SB8 in order to continue the embroidery mode (the free motion sewing mode).
- step SB8 the microcomputer 30 determines the sewing speed based on the main slide volume 10, and the swing signal of the needle 12 in the X direction is adjusted by the input signal from the foot controller 20.
- step SB10 the microcomputer 30 performs mode processing other than free motion sewing.
- the sewing operation is basically the same as the sewing operation in the free motion sewing mode, but differs in the following points. That is, in modes other than free motion sewing, when the sewing stop signal is output, the microcomputer 30 stops the sewing operation by stopping the spindle motor 59 and the swing width adjusting motor but opens the upper thread tension disc Do not process and keep the upper thread tension plate closed. As a result, in modes other than free motion sewing, tension on the upper thread supplied to the needle 12 is kept applied even if the sewing operation is stopped.
- the microcomputer 30 In the modes other than the free motion sewing, unlike the free motion sewing, the microcomputer 30 always applies tension to the upper thread supplied to the needle 12. Thereby, the slack of the upper thread can be suppressed and the sewing operation can be favorably continued. That is, in the modes other than the free motion sewing, unlike the free motion sewing, it is not necessary to move the needle drop position of the needle 12 largely and frequently. Instead, once the sewing operation is stopped, the cloth is changed in direction, and the sewing operation is often performed continuously. Therefore, in modes other than free motion sewing, by always applying tension to the upper thread supplied to the needle 12, slack of the upper thread is suppressed and the sewing operation is continued smoothly.
- FIG. 11 shows Example 3.
- the thread tension plate 89 is opened to reduce the tension of the upper thread.
- ⁇ T can be exemplified in the range of 0.2 to 3.0 seconds, in the range of 0.5 to 2.0 seconds, and particularly in the range of 1.0 to 1.5 seconds.
- FIG. 11 is a flowchart showing control processing associated with the sewing operation of the sewing machine 100.
- the control process is repeatedly executed by the microcomputer 30 while the power of the sewing machine 100 is turned on.
- the differences from the flowchart shown in FIG. 10 are as follows.
- a sewing stop signal is input to the microcomputer 30 by the foot controller 20, and the spindle motor 59 is stopped (step SC7).
- the process proceeds to step SC11.
- the microcomputer 30 waits for a predetermined time ⁇ T from the time when the sewing stop signal is input to the microcomputer 30, and determines whether the sewing start signal from the foot controller 20 is input to the microcomputer 30 during standby.
- step SC11 If the sewing start signal is input within the predetermined time ⁇ T (YES in step SC11), the process proceeds to step SC8 in which the sewing speed adjustment is performed. If the sewing start signal is not input within the predetermined time ⁇ T (NO in step SC11), the thread tension plate 89 is opened to weaken the tension of the upper thread supplied to the needle 12 (step SC9).
- the present embodiment basically has the same configuration and the same effects as the first to third embodiments.
- the following description will focus on the differences.
- the user may accidentally release the foot temporarily from the pedal 21 of the foot controller 20 without intending to stop the sewing.
- the dynamic contact point P of the wiper 24b is separated from the resistor 24a to stop the spindle motor 59 and output a sewing stop signal.
- the user immediately steps the pedal 21 of the foot controller 20 again.
- the tension of the upper thread supplied to the needle 12 is maintained before the predetermined time ⁇ T elapses from the time when the signal for stopping the spindle motor 59 is output, the tension of the upper thread is weakened. Since it can not be done, the slack of the upper thread can be suppressed. Therefore, if the user immediately depresses the foot controller 20, the sewing operation can be continuously performed, and the convenience of the sewing operation is improved. In this case, after the sewing stop signal from the start switch 6 or the sewing stop signal from the foot controller 20 is output to the microcomputer 30, the microcomputer 30 outputs a control signal for reducing the tension of the upper thread to the motor of the upper thread tension adjusting mechanism 81. Control the time to output to 82.
- the spindle motor 59 is operated to continue the sewing operation by stepping on the pedal 21 of the foot controller 20 within the predetermined time ⁇ T.
- the microcomputer 30 outputs a control signal for reducing the tension of the upper thread to the motor 82 of the upper thread tension adjusting mechanism 81.
- step SD1 the microcomputer 30 reads the state of the main body switch S operated by the user, outputs a signal corresponding thereto to the display section D, and displays the operation content. That is, when the user operates the pattern number display & selection switch 7a, the indicator lamp 7a1 lights up and the current pattern number is displayed on the 7-segment LED 9.
- the indicator light 7b1 lights up and the feed width of the feed tooth 15 (FIG. 3) is displayed on the 7-segment LED 9.
- the indicator light 7c1 lights up and the swing width of the needle 12 is displayed on the 7-segment LED 9.
- step SD2 determines whether the embroidery mode (free motion sewing) is selected (step SD2). In this case, the microcomputer 30 reads and determines the operation state of the changeover switch 8. If the embroidery mode is selected, the microcomputer 30 proceeds to step SD3 and determines whether a sewing start signal is output. Specifically, when the foot controller 20 is depressed, a sewing start signal is output. When the sewing start signal is output (Yes in step SD3), a command to apply tension to the upper thread by closing the thread tension plate 89 is output to the upper thread tension adjusting mechanism 81 (step SD4), and the sewing operation start processing is performed. Perform (step SD5). Specifically, numerical conversion processing of the foot controller 20 is performed based on the depression amount of the pedal 21.
- an analog value of the depression amount of the pedal 21 corresponding to the swing width adjustment amount of the hand 12 is input to the microcomputer 30 and A / D converted. Further, based on the A / D converted value and the data value (* 2) of Table 1 stored in advance in memory 30m of microcomputer 30, microcomputer 30 controls needle bar 11 and needles in the lateral direction (X direction). Determine the amplitude of 12 The spindle rotational speed is determined on the basis of an instruction value of the adjustment knob 10a of the main slide volume 10 and data stored in advance in the memory 30m of the microcomputer 30 (* 2 in Table 1).
- the microcomputer 30 determines whether or not the sewing stop signal is output (step SD6). If it is output, the sewing operation stop process is performed to stop the rotation of the spindle motor 59 (step SD7). Thereafter, the microcomputer 30 determines whether or not a predetermined time ⁇ T has elapsed from the time when the sewing stop signal is output (step SD8). If the condition (No at Step SD8) in which the predetermined time ⁇ T has not elapsed from the time when the sewing stop signal is output and the condition (No at Step SD10) where the sewing start signal is not satisfied are satisfied, the procedure returns to Step SD8. Measurement of time ⁇ T is continued.
- step SD8 when the condition (No in step SD8) in which the predetermined time ⁇ T has not elapsed from the time when the sewing stop signal is output and the condition in which the sewing start signal is present (Yes in step SD10) are satisfied.
- the process advances to SD11 to perform sewing operation processing.
- the microcomputer 30 executes numerical conversion processing of the foot controller 20 based on the depression amount of the pedal 21 of the foot controller 20 (step SD11). That is, the analog value of the depression amount of the pedal 21 is input to the microcomputer 30 and A / D converted. Further, based on the A / D converted value and the data values (* 2 in Table 1) of Table 1 stored in advance in the memory 30m of the microcomputer 30, the microcomputer 30 operates in the lateral direction (X direction). ) Is determined (step SD12). Further, the microcomputer 30 determines the spindle rotational speed based on the instruction value of the adjustment knob 10a of the main slide volume 10 and the data (* 2 in Table 1) stored in advance in the memory 30m of the microcomputer 30 (step SD 12).
- the microcomputer 30 outputs the determined signal to the spindle motor 59 and the swing width adjustment motor 71 (step SD13), and returns to step SD6 to continue free motion sewing.
- the main shaft 53 is rotationally driven to move the needle bar 11 and the needle 12 up and down, and the needle bar 11 and the needle 12 are swung in the arrow X direction.
- the microcomputer 30 The thread tension plate 89 of the upper thread tension adjusting mechanism 81 is opened to reduce the tension of the upper thread (step SD9). In this case, the user can move the cloth in any direction.
- step SD8 when the condition (No in step SD8) in which the predetermined time ⁇ T has not elapsed from the time when the sewing stop signal is output and the condition in which the sewing start signal is present (Yes in step SD10) are satisfied.
- step SD10 when the condition (No in step SD8) in which the predetermined time ⁇ T has not elapsed from the time when the sewing stop signal is output and the condition in which the sewing start signal is present (Yes in step SD10) are satisfied.
- step SD6 when the sewing stop signal is not output (No in step SD6), the sewing operation processing is continued in steps SD11, 12 and 13.
- the needle bar 11 and the needle 12 are shaken in the arrow X direction while the main shaft 53 is rotationally driven to move the needle bar 11 and the needle 12 up and down.
- step SD20 it is determined whether the pressing bar 90 is lowered (step SD20). This is detected by the pressing position sensor 91.
- the microcomputer 30 outputs a command to open the thread tension plate 89 and weaken the upper thread tension to the motor 82 of the upper thread tension adjustment mechanism 81 to stop the sewing. To do (step SD33).
- step SD22 the microcomputer 30 outputs a command to apply tension to the upper thread by closing the thread tension plate 89 to the motor 82 of the upper thread tension adjustment mechanism 81 in order to perform sewing.
- step SD22 The sewing start signal is output to the microcomputer 30 by stepping on the foot controller 20 or operating the start switch 6 as described above.
- the microcomputer 30 performs a sewing operation start process (step SD23).
- an analog value of the depression amount of the pedal 21 of the foot controller 20 is input to the microcomputer 30 and is A / D converted. Further, based on the A / D conversion value and the data of Table 1 (* 1 in Table 1) stored in advance in the memory 30m of the microcomputer 30, the microcomputer 30 determines the spindle rotational speed. The swing width of the needle 12 is determined based on the indication value of the main body switch S and the data (* 1 in Table 1) stored in advance in the memory 30 m of the microcomputer 30.
- the sewing stop signal is output (Yes in step SD24)
- a sewing operation stop process is performed (step SD29), and a command to stop the rotation of the spindle motor 59 is output.
- the microcomputer 30 Since the sewing is prohibited when the condition that the presser bar 90 is raised (Yes in step SD25) is satisfied although the sewing stop signal is not output (No in step SD24), the microcomputer 30 performs sewing The operation stop processing is performed (step SD30), the thread tension plate 89 is opened (step SD31), and the tension of the upper thread is weakened. Since the sewing is permitted when the condition that the sewing stop signal is not output (No in step SD24) and the condition that the presser 13 is not lifted (No in step SD25), the microcomputer 30 starts the sewing operation. Do the processing. Specifically, the microcomputer 30 executes numerical conversion processing of the foot controller 20 based on the depression amount of the pedal 21 of the foot controller 20 (step SD26).
- the analog value of the depression amount of the pedal 21 is input to the microcomputer 30 and A / D converted (step SD26). Furthermore, the microcomputer 30 determines the spindle rotational speed based on the A / D conversion value and the data values (* 1 in Table 1) of Table 1 stored in advance in the memory 30m of the microcomputer 30. To do (step SD27). Furthermore, the microcomputer 30 determines the swing width of the needle 12 in the lateral direction based on the instruction value of the main body switch S and the data (* 1 in Table 1) stored in advance in the memory 30 m of the microcomputer 30 (step SD 27). Further, the microcomputer 30 outputs the signal to the spindle motor 59 and the swing width adjusting motor 71 (step SD28), and returns to step SD24.
- FIG. 14 shows a timing chart of control in the free motion sewing (embroidery mode) described above.
- This chart shows the on / off signal of the spindle motor 59, the open / close signal of the thread tension plate 89, and the stepping amount (operation amount) of the foot controller 20.
- the sewing start signal P1 is output at time t1 when the foot controller 20 changes from the A position to the B position, a signal to open the thread tension disc 89 from the open state to the close state is output, and the upper thread is tensioned. Further, at time t1, a signal for turning on the spindle motor 59 is output, and the spindle 53 is rotated.
- the sewing stop signals P2 and P4 may be output at time t2 and time t4.
- the leg of the user steps on the foot controller 20 again and the sewing start signals P3 and P5 are output from the foot controller 20 to the microcomputer 30 at time t3 and time t5.
- the pressure plate 89 is kept closed and the upper thread is kept in tension.
- the sewing stop signal P6 is output from the foot controller 20 to the microcomputer 30 at time t6.
- a signal for stopping the rotation of the spindle motor 59 is output.
- the microcomputer 30 outputs a signal to open the thread tension plate 89, and the tension of the upper thread is weakened.
- the user's leg is temporarily temporarily removed from the foot controller 20, and even when the sewing stop signal is output, the signal to stop the sewing is If it is within a predetermined time ⁇ T from the time when the foot controller 20 outputs to the microcomputer 30, the thread tension disc 89 is kept closed, that is, the upper thread tension is maintained. For this reason, the user can restart the sewing favorably if the user steps on the foot controller 20 promptly.
- FIG. 15 shows Example 5.
- the foot controller 20 has a first foot controller 20 f (first foot operating unit) and a second foot controller 20 s (second foot operating unit), which are separate from each other and to which the stepping signal is input to the microcomputer 30.
- first foot controller 20f is stepped on with one of the left leg and the right leg of the user.
- the second foot controller 20s is depressed on the other of the user's left and right legs.
- the microcomputer 30 determines the amount of swing of the needle bar 11 and the needle 12 based on * 2 of Table 1 based on the amount of depression of the first foot controller 20f. Further, in the free motion sewing mode, the microcomputer 30 determines the spindle rotational speed, that is, the sewing speed, based on * 1 in Table 1 of the amount of depression of the second foot controller 20s. In the mode other than the free motion sewing, either one of the first foot controller 20 f and the second foot controller 20 s can be used. Although not shown, although the foot controller 20 is a single unit, it may have a first foot operating unit and a second foot operating unit for inputting a stepping signal to the microcomputer 30.
- FIG. 16 shows the concept of the sixth embodiment.
- the present embodiment basically has the same configuration and the same effects as the first to fifth embodiments. The following description will be focused on different parts. Common parts are given the same reference numerals.
- the foot controller 20K is a method of operating the knee and / or thigh of the user's leg to the left and right.
- the foot controller 20K is provided at the distal end of the arm 210 with a substantially L-shaped arm 210 rotatably held via a bearing (not shown) by an insertion hole 2mo opened in the front of the bed 2, and the user
- the operation unit 220 operated to the left and right with the knees and / or thighs of the legs, the return spring 23 for returning the position of the arm 210 to the original position, and the variable resistor 24 provided in the bed 2 and having the resistor 24a.
- a wiper 24 b that moves along the resistor 24 a of the variable resistor 24 in conjunction with the arm 210.
- the arm 210 interlocked therewith moves in the same direction, and the wiper 24b moves accordingly.
- the moving contact point P of the wiper 24 b moves on the resistor 24 a based on the left and right movement of the arm 210 and the operation unit 220, and outputs a signal to the microcomputer 30.
- the arm 210 is preferably formed by a first arm 211 provided in the bed 2 so as to hold the wiper 24 b and a second arm 212 exposed to the outside of the bed 2.
- the second arm 212 is preferably detachably mounted to the first arm 211.
- the second arm 212 and the first arm 211 may be integral.
Abstract
Description
本発明によれば、制御部は、フリーモーション縫製において、縫製を実行しつつ針棒の振り幅量を調整できる。
(1)ミシンは、ユーザが足で操作可能なフットコントローラを備える。制御部は、フリーモーション縫製のモードにおいて、フットコントローラの操作に基づいて横方向における針棒の振り幅量を調整する。従って、ユーザはフリーモーション縫製を実行しつつ、針棒に装着されている針の振り幅量の大小を調整できる。この場合、ユーザはフリーモーション縫製を実行しつつ、フットコントローラの操作を調整することにより、横方向(直線縫における送り歯の送る縦方向と交差する方向)へ向けて針棒が揺動する振り幅量を調整できる。従って、縫製中おいて、針棒に装着されている針が横方向に沿って揺動する振り幅量を調整できる。フリーモーション縫製では、送り歯の送り作用を無効化することが好ましい。
(9)フットコントローラはユーザの脚(脚裏、足首、膝、すね、大腿、脚指等)のうちの少なくとも一部で操作される。従ってフットコントローラは、ユーザの脚先で踏み込み操作する方式に限定されず、ユーザの脚の膝および/または大腿部で操作する方式とすることができる。
図7は、図1のミシン100の縫製作動を示すフローチャートの一例を示す。フローチャートはこれに限定されるものではない。図7に示すように、ミシン100の縫製作動は、Step1、Step2、Step3N、Step4N、Step3Y、Step4Y、及びStep5からなる。ミシン100の電源がオフされると、マイコン30の処理は停止される。フットコントローラ20がミシン本体1に接続されている場合の各Stepについて、以下に説明する。
縫製開始信号が出力されているときには(ステップSD22のYes)、マイコン30は縫製動作開始処理を行う(ステップSD23)。
なお、フリーモーション縫製以外のモードのときには、第1フットコントローラ20fおよび第2フットコントローラ20sのうちのいずれか一方を用いることができる。なお、上記した構成に限らず、図示しないものの、フットコントローラ20は単体であるものの、踏み込み信号をマイコン30に入力させる第1フット操作部および第2フット操作部を有することにしても良い。
Claims (10)
- 針を装着可能で且つ上下方向に往復動可能な針棒と、
前記針棒を上下方向へ往復動させる針棒上下動機構と、
直線縫における送り歯の送る縦方向に対し横方向へ前記針棒を揺動させる針棒揺動機構と、
前記針棒上下動機構の作動と前記針棒揺動機構の作動とを制御し、フリーモーション縫製のモードにおいて、前記針棒揺動機構により前記横方向へ前記針棒が揺動する振り幅量を調整する制御部とを具備することを特徴とするミシン。 - 請求項1において、前記ミシンは、ユーザが足で踏み込み可能なフットコントローラを備え、
前記制御部は、前記フリーモーション縫製のモードにおいて、前記フットコントローラの操作に基づいて前記横方向への前記針棒の前記振り幅量を調整することを特徴とするミシン。 - 請求項1または2において、前記フリーモーション縫製のモードにおいて、前記制御部は、前記フットコントローラが操作されているとき前記針棒上下動機構をオンさせ、前記フットコントローラが操作されていないとき前記針棒上下動機構をオフとさせることを特徴とするミシン。
- 請求項1~3のうちの一項において、前記制御部は、前記フリーモーション縫製のモードにおいて、前記フットコントローラの操作に基づいて前記横方向への前記針棒の前記振り幅量を調整し、
前記フリーモーション縫製以外のモードにおいて、前記フットコントローラの操作に基づいて前記針棒が上下動する縫製速度を調整することを特徴とするミシン。 - 請求項4において、前記ミシンは切替要素を有しており、切替要素は、前記フリーモーション縫製のモードを実行するときにおける前記フットコントローラによる前記振り幅の前記調整と、前記フリーモーション縫製以外のモードを実行するときにおける前記針棒が上下動する縫製速度の調整とを切替えることを特徴とするミシン。
- 請求項1~5のうちの一項において、前記ミシンは、前記フリーモーション縫製のモードにおいて前記針棒が上下動する縫製速度を調整する調整スイッチを有することを特徴とするミシン。
- 請求項1~6のうちの一項において、前記ミシンは、前記針に供給される上糸に張力を与える上糸張力調整機構を有しており、
前記制御部は、縫製動作中において前記上糸に張力を与える指令を前記上糸張力調整機構に出力し、縫製動作の停止中において前記上糸の張力を弱める指令を前記上糸張力調整機構に出力することを特徴とするミシン。 - 請求項1~6のうちの一項において、前記ミシンは、上糸供給源から前記針に供給される上糸に張力を与える上糸張力調整機構を有しており、
前記制御部は、前記フリーモーション縫製のモードにおいて、前記フリーモーション縫製の縫製停止信号が出力される場合において、前記縫製停止信号の出力から所定時間ΔT経過するまでは、前記上糸張力調整機構により前記上糸に張力を与え、
前記縫製停止信号の出力から前記所定時間ΔT経過した後、前記上糸張力調整機構により前記上糸の張力を弱めることを特徴とするミシン。 - 請求項1~8のうちの一項において、前記フットコントローラは、第1フット操作部および第2フット操作部を有しており、前記制御部は、前記フリーモーション縫製のモードにおいて、前記針棒揺動機構により前記横方向へ前記針棒が揺動する振り幅量を前記第1フット操作部の操作に基づいて調整し、且つ、前記針棒が上下動する縫製速度を前記第2フット操作部の操作に基づいて調整することを特徴とするミシン。
- 請求項1~9のうちの一項において、前記フットコントローラは、ユーザの脚で踏み込み操作する方式、あるいは、ユーザの脚の膝および/または大腿部で操作する方式であることを特徴とするミシン。
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