JP2009125247A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine which can adjust the timing of a shuttle hook easily. <P>SOLUTION: A motor lock mechanism 24 which locks the driving of a sewing machine motor 23 with the sewing machine motor 23 stopped and a hook adjustment mode shift switch 26 for shifting to a hook adjustment mode which adjusts the timing of a shuttle hook 6 are provided to make a memory unit 33 memorize the angular position of rotation of a sewing machine spindle 22 set preliminarily for using in the hook adjustment mode. A control means 31 is formed so that the sewing machine spindle 22 holds a halt condition at the angular position of rotation memorized in the memory unit 33 by actuating the motor lock mechanism 24 and blocking the driving of the sewing machine motor 23 after the sewing machine spindle 22 actuates the sewing machine motor 23 so that it can take the angular position of rotation memorized in the memory unit 33 when shifting to the hook adjustment mode. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sewing machine suitable for easily and surely aligning a sewing needle with a sword tip of a half-turn hook.

  2. Description of the Related Art Conventionally, a sewing machine including a half-turn hook is known as one type of sewing machine (see, for example, Patent Document 1).

  FIG. 3 shows an essential part of an example of a sewing machine provided with a conventional half-turn hook. This sewing machine 101 has a needle bar 2. The needle bar 2 is disposed on the free end side of the arm portion Fa of the sewing machine frame F (FIG. 5). The sewing machine frame F includes a substantially rectangular box-shaped bed part, a connecting body part projecting upward provided at a rear part that is one end of the bed part, and a front part that is the other end from the upper part of the connecting body part. And an arm portion Fa provided so as to extend in parallel with the bed portion, and is formed in a substantially U-shape as a whole.

  The needle bar 2 is disposed so that the lower end of the needle bar 2 protrudes from the lower surface facing the bed part toward the needle drop position of the bed part on the free end side of the arm part Fa. The base end of the sewing needle N is detachably attached via a needle clamp 3. The needle bar 2 is formed so as to be reciprocally movable in a vertical direction with a predetermined stroke by a needle bar drive mechanism (not shown). This needle bar drive mechanism is connected to the upper shaft as a sewing machine main shaft (not shown) that is rotatably supported inside the arm portion Fa, and the upper shaft is rotated by a sewing machine motor (not shown). It is formed so that it can be driven in conjunction with rotation.

  A half-turn hook 4 is disposed inside the bed portion below the sewing needle N, specifically, below a needle plate (not shown) disposed at a needle drop position on the upper surface of the bed portion. The half-turn hook 4 is attached to the inside of the bed portion of the sewing machine frame F, and is rotatably attached to the hook 5 by an intermediate hook presser (not shown), and a bobbin case (both not shown) And a driver 7 that rotates the inner hook 6. A hook shaft 8 is rotatably inserted into the central portion of the cauldron 5.

  As shown in FIG. 4, the driver 7 has a main body portion 7 </ b> A having a substantially semicircular arc shape, and a bracket portion 7 </ b> B inserted into the distal end portion of the shuttle shaft 8. The driver 7 is detachably attached to the front end portion of the hook shaft 8 by inserting the bracket portion 7B into the front end portion of the hook shaft 8 protruding inside the cauldron 5 and holding it by tightening the driver mounting screw 9. Attached to and fixed.

  The rear end of the hook shaft 8 is connected to one end of a lower shaft 10 that is rotatably supported inside the bed portion of the sewing machine frame F. The lower shaft 10 is configured to be interlocked with the upper shaft by a swing mechanism including a crankshaft, a crank rod, a connecting member, and the like (not shown). Both the half-rotation motion in the forward rotation direction and the half-rotation motion in the reverse rotation direction are performed once). The needle bar 2 is also configured to reciprocate once for one rotation of the upper shaft.

  When the driver 7 rotates in the forward movement direction (forward rotation direction) indicated by the arrow a in FIG. 3, the one end 7 a abuts against the inner hook 6 and presses it to rotate the inner hook 6 in the same direction. When rotating in the backward movement direction (reverse rotation direction) indicated by the arrow b in FIG. 3, the other end portion 7b comes into contact with the inner hook 6 and presses it to rotate in the same direction.

  At the time of the sewing operation, when the needle bar 2 (the sewing needle N) is slightly raised from the bottom dead center, the upper thread loop formed in the vicinity of the sewing needle N is captured by the sword tip 6A of the inner hook 6, and the inner hook The upper thread loop that has been expanded around the inner hook 6 when it is rotated approximately half in the forward movement direction is disengaged from the sword tip 6A, and at the same time, the inner hook 6 is rotated in the backward movement direction. When the upper thread loop is tightened as the balance (not shown) rises, the lower thread extending from the bobbin case housed in the inner hook 6 and the upper thread are entangled, and the opposite side of the inner hook 6 from the sword tip 6A. The upper thread loop passes between the rear end portion and the driver 7 and is pulled up onto the needle plate, so that a seam is formed on the sewing object.

  By the way, in order to properly execute the seam forming operation, it is important that the relative position between the sword tip 6A of the inner hook 6 and the sewing needle N is properly set. It is necessary to manually adjust the timing of the inner hook 6 so that the driver 7 for operating the inner hook 6 is accurately attached to the hook shaft 8 every time the sewing conditions such as the thickness, the sewing needle N used for sewing, and the thread change. There is.

  Such timing adjustment of the inner hook 6, that is, adjustment of the mounting position of the driver 7 in the half-turn hook 4, first, the position of the sewing needle N is changed to the position where the upper thread loop is formed, that is, the needle bar 2. Set the position slightly higher than the bottom dead center. Thereby, the rotation angle position of the upper shaft is set.

  Specifically, as shown in FIG. 5, a marking 2a formed in advance on the needle bar 2 is slidably supported so that the needle bar 2 arranged so as to face the bed portion moves up and down. This is done by visually matching the lower end 11a of the needle bar metal 11 as a bearing.

  Next, the sewing needle N and the sword tip 6A of the inner hook 6 are aligned. This alignment is performed by manually rotating the screwdriver 7 in a non-fixed state in which the screwdriver screw 9 is loosened with respect to the hook shaft 8 so that the one end 7a abuts against the inner hook 6 and the center of the sewing needle N. This is carried out by matching the sword tip 6A of the inner pot 6 with the sword.

  Next, by tightening the driver mounting screw 9 in the aligned state, the driver 7 is attached and fixed to the hook shaft 8 and the timing adjustment of the inner hook 6 is completed.

Japanese Utility Model Publication No. 7-5578

  However, in the conventional timing adjustment of the inner hook 6, when the driver 7 is moved or the driver mounting screw 9 is tightened, a rotational force is applied to the hook shaft 8, and the hook shaft 8 and thus the upper shaft rotates. As a result, the rotational angle position of the upper shaft may be displaced in the rotational direction.

  Therefore, in the conventional timing adjustment of the inner hook 6, there is no deviation in the rotational angle position of the upper shaft by tightening the driver mounting screw 9, that is, the score line 2 a and the lower end 11 a of the needle bar metal 11 match. There is a case in which it is necessary to repeatedly check that there is a problem, and there is a problem that a great amount of labor and time are required to adjust the timing of the inner hook 6.

  Therefore, there is a demand for a sewing machine that can easily adjust the timing of the inner hook.

  The present invention has been made in view of this point, and an object thereof is to provide a sewing machine capable of easily adjusting the timing of the inner hook.

  In order to achieve the above-described object, the sewing machine according to the present invention is characterized by a sewing machine motor for rotationally driving a sewing machine spindle, a sewing needle that is reciprocated in the vertical direction in conjunction with the rotation of the sewing machine spindle, A hook shaft that swings in conjunction with the rotation of the sewing machine main shaft, a hook, a sword that catches the loop of the upper thread that is built into the hook and is inserted into the sewing needle, and the bobbin bobbin is rotatable. A semi-rotary hook provided with a supporting hook, a driver that is detachably attached to the hook shaft in order to drive the hook, and an arithmetic section and a storage section for controlling the operation of each section In the sewing machine having the control means provided, a motor lock mechanism for locking the drive of the sewing machine motor in a stopped state of the sewing machine motor, and a hook adjustment mode for adjusting the timing of the inner hook A hook adjustment mode transition switch for shifting, and the storage unit stores a preset rotation angle position of the sewing machine spindle for use in the hook adjustment mode, and the control means When the hook adjustment mode is entered, the sewing machine motor is driven so that the sewing machine main shaft can take the rotational angle position stored in the storage unit, and then the motor lock mechanism is driven to drive the sewing machine motor. By preventing the drive, the main spindle of the sewing machine is in a stopped state at the rotation angle position stored in the storage unit. By adopting such a configuration, when adjusting the timing of the inner hook, even if a rotational force is applied to the hook shaft, the hook shaft, and therefore the sewing machine main shaft, rotates, and the rotation of the sewing machine main shaft. It is possible to easily and reliably prevent the angular position from shifting in the rotational direction.

  There are a plurality of types of rotation angle positions, and a selection switch is provided for selecting one of the plurality of types of rotation angle positions to be used for timing adjustment of the inner hook when the mode shifts to the hook adjustment mode. It is preferable. By adopting such a configuration, when adjusting the timing of the inner hook by a simple operation of operating the selection switch, the thickness of the sewing object, sewing needles and threads used for sewing, etc. The rotational angle position of the sewing machine spindle that varies depending on the sewing conditions can be set easily and reliably.

  It is preferable that a main shaft rotation switch is provided for forcibly moving the rotational angle position of the sewing machine main shaft held in a stopped state when the shuttle adjustment mode is entered. By adopting such a configuration, it is possible to easily confirm the interference of the hook with the sewing needle and the interference of the driver with the sewing needle by operating the spindle rotation switch.

  According to the sewing machine of the present invention, when adjusting the timing of the inner hook, the sewing machine main shaft is held in a stopped state at the rotation angle position value stored in the storage unit, so that the rotation angle position of the sewing machine main shaft is the rotation direction. It is possible to prevent shifting. As a result, there are excellent effects such as easy adjustment of the timing of the inner hook.

  The present invention will be described below with reference to embodiments shown in the drawings. Note that the same or corresponding components as those of the conventional one described above are denoted by the same reference numerals in the drawings, and detailed description thereof is omitted.

  FIG. 1 and FIG. 2 show a main part of an embodiment of a sewing machine according to the present invention, FIG. 1 is a perspective view of the main part, and FIG. 2 is a block diagram of the main part.

  The sewing machine according to the present embodiment has a basic configuration of a sewing machine having a conventional half-turn hook.

  As shown in FIG. 1, the sewing machine 1 of the present embodiment has a needle bar 2. The needle bar 2 is disposed on the free end side of the arm portion (Fa in FIG. 5) of the sewing machine frame (F in FIG. 5).

  The needle bar 2 is disposed so that its lower end protrudes from the lower surface facing the bed part toward the needle drop position of the bed part on the free end side of the arm part. The base end of the sewing needle N is detachably attached via a needle clamp 3.

  The needle bar 2 can be reciprocated in the vertical direction with a predetermined stroke by a needle bar drive mechanism 21. The needle bar drive mechanism 21 is connected to an upper shaft 22 as a main spindle of a sewing machine rotatably supported in the arm portion. The upper shaft 22 is rotated by a sewing machine motor 23, whereby the upper shaft 22 It is formed so that it can be driven in conjunction with rotation.

  The needle bar drive mechanism 21 includes a counterweight 21a attached to the upper shaft 22, a needle bar crank (not shown) attached to the counterweight 21a, one end portion attached to the needle bar crank, and the like, as conventionally known. The end portion is provided with a needle bar crank rod 21d attached to a substantially intermediate position of the needle bar 2 via a needle bar holder 21c.

  The sewing machine motor 23 of this embodiment has a motor lock mechanism 24 that locks the drive of the sewing machine motor 23 when the sewing machine motor 23 is stopped, that is, locks the rotation of the output shaft. As this motor lock mechanism 24, the structure which makes the sewing machine motor 23 a fixed state by electricity supply is used. This is because the sewing machine motor 23 is provided with a feedback mechanism capable of high-accuracy positioning with an AC servo motor, and is always driven within a rotation angle range of several degrees at the rotation angle position at which the output shaft is to be stopped. Therefore, the rotation position of the output shaft is fixed by the holding force by this action. In this case, the output shaft is actually driven in a minute angle range, but it is visually recognized by the human eye as if the output shaft is stopped.

  Further, as the motor lock mechanism 24, a disc brake built in the motor by cutting off the motor drive current may be used. This uses a motor equipped with a micro electromagnetic brake. A micro electromagnetic brake is a motor with a built-in disc brake mechanism that holds the disc brake with frictional force to stop and fix the output shaft. And a solenoid mechanism (which switches on and off the repulsive force of the biasing spring by excitation).

  Instead of the motor lock mechanism 24, a structure that can hold the upper shaft 22 in a stopped state, for example, a disc brake (electromagnetic brake) that directly locks the drive of the upper shaft 22 may be provided.

  A half-turn hook 4 is disposed inside the bed portion below the sewing needle N, specifically, below a needle plate (not shown) disposed at a needle drop position on the upper surface of the bed portion. The half-turn hook 4 is attached to the inside of the bed portion of the sewing machine frame 5 and is rotatably attached to the hook 5 by an intermediate hook presser (not shown), and the bobbin bobbin is attached to a bobbin case (both not shown). ) And a driver 7 for rotating the inner hook 6. A hook shaft 8 is rotatably inserted into the central portion of the cauldron 5.

  The driver 7 has a main body portion 7A having a substantially semicircular arc shape, and a bracket portion 7B inserted into the front end portion of the hook shaft 8, and the hook shaft protruding from the inside of the cauldron 5 to the bracket portion 7B. 8 is inserted into the distal end portion 8 and held by tightening the driver mounting screw 9, so that it is detachably attached to the distal end portion of the shuttle shaft 8 and fixed.

  The shuttle shaft 8 is connected at its rear end to one end of a lower shaft 10 that is rotatably supported inside the bed portion of the sewing machine frame. The lower shaft 10 is configured to be interlocked with the upper shaft 22 by a swinging mechanism including a crankshaft, a crank rod, a connecting member, and the like (not shown). (Half rotation in the forward direction and half rotation in the reverse direction are performed once). The needle bar 2 is also configured to reciprocate once for one rotation of the upper shaft 22.

  The sewing machine 1 of this embodiment has a touch panel 25 as an operation panel. The touch panel 25 is disposed on the operation side of the side surfaces of the connecting body portion or arm portion of the sewing machine frame. The touch panel 25 is configured by disposing a display panel as display means on the back of a transparent sheet-like sensor as input means. In addition, the touch panel 25 is provided with a display unit 25A used for displaying various types of information and an operation unit 25B used for inputting various types of information necessary for performing sewing.

  The operation unit 25B of the present embodiment includes at least a transition key 26 as a hook adjustment mode transition switch for shifting to the hook adjustment mode for adjusting the timing of the inner hook 6, and the middle pot when the hook adjustment mode is entered. 6 for selecting the rotation angle position of the upper shaft 22 used for timing adjustment, and forcing the rotation angle position of the upper shaft 22 held in a stopped state when the mode shifts to the hook adjustment mode. There are a movement key 28 as a main shaft rotation switch for movement, a determination key 29 as a determination switch used for determining various settings, and operation keys as various operation switches such as a cursor key and numeric keys (not shown). Is provided.

  The transition key 26 may be a mode switching key (switch) for switching various modes such as a sewing mode for sewing a sewing object, a hook adjustment mode, and a setting mode for setting sewing conditions.

  The selection key 27 may be any key that can select a plurality of types of rotation angle positions stored in the storage unit 33 described later. Further, the number of selection keys 27 may be singular or plural.

  For example, a plurality of types of rotation angle positions stored in the storage unit 33 are displayed on the display unit 25A, and the rotation angle positions to be used are selected from the plurality of types of rotation angle positions displayed on the display unit 25A with the selection key 27. With the configuration of selecting, a plurality of types of rotation angle positions are sequentially displayed on the display unit 25A by operating one selection key 27, and when the rotation angle position to be used is displayed on the display unit 25A, the enter key 29 is used. It may be configured to be fixed. Further, when the selection key 27 is operated normally, a plurality of types of rotation angle positions are displayed in order on the display unit 25A, and the selection key 27 is operated by long-pressing to confirm the rotation angle position to be used. It is good also as a structure. Further, a plurality of selection keys 27 are provided, each of the plurality of types of rotation angle positions stored in the storage unit 33 is associated with each selection key, and the selection key 27 corresponding to the rotation angle position to be used is operated. Thereby, it is good also as a structure which fixes the rotation angle position to use.

  As the movement key 28, the driving amount of the sewing machine motor 23 can be controlled according to the pressing time, and the needle bar 2 moves up in the rotation direction of the output shaft of the sewing machine motor 23, and hence the rotation direction of the upper shaft 22. Having a plus key 28a used when rotating to move in the direction and a minus key 28b used when rotating so that the needle bar 2 moves in the downward direction facilitates operation. Is preferable in the sense that Of course, the motor lock mechanism 24 is released when the movement key 28 is operated, and the motor lock mechanism 24 is driven when the operation of the movement key 28 is finished.

  The operation keys (switches) are not actual projections but are displayed with pictorial symbols or the like at preset positions on the touch panel 25, and the operator touches the display portion of each operation switch with a finger or the like. Alternatively, the function of the displayed operation key is executed by pressing the button. In addition, as a display of the operation key, a configuration in which a screen such as the display of the operation key of the operation unit 25B and the display of the display unit 25A can be switched in association with the operation of the specific operation key. It is preferable in the sense that improvement and downsizing can be easily achieved. In addition, what is necessary is just to set arrangement | positioning of each operation key as needed, such as a specification and a design concept.

  It should be noted that the sewing machine 1 can be provided with a handle for manually operating the sewing needle N by the operation of the operator as required by the design concept or the like. This handle may be a handle that is connected so as to be able to rotate and drive the upper shaft 22, or a handle that is connected so that it can be driven so as to rotate the output shaft of the sewing machine motor 23. There may be.

  As shown in FIG. 2, the control means 31 of this embodiment includes at least a CPU 32 (may be an MPU), a storage unit 33 (memory), and a system controller (not shown) that function as an arithmetic unit, as in the microcomputer. have. The control means 31 includes a sewing machine motor 23 that rotates the upper shaft 22, a touch panel 25, various switches that are not arranged on the touch panel 25 such as a sewing start switch (not shown), a power switch, and various operation detections and position detections. Various sensors used for the above, for example, a rotary encoder that detects the rotation angle of the upper shaft 22, a rotary encoder that detects the rotation angle and the number of rotations of the output shaft of the sewing machine motor 23, etc. 31. Specifically, operation control of each part of the sewing machine 1 is performed by a control command sent from the CPU 32.

  The storage unit 33 includes at least ROM and RAM having appropriate capacities, and an auxiliary storage device such as a removable memory card or flash memory is used in combination with the design concept as required. .

  The storage unit 33 is provided with at least a hook adjustment mode control unit 34, and a preset rotation angle position of the upper shaft 22 for use in the hook adjustment mode, specifically, an angle value of the upper shaft 22 is set. Is remembered.

  It should be noted that a plurality of types of rotation angle positions to be stored in advance in the storage unit 33 may be selected depending on the thickness of the sewing object, sewing needles N and threads used for sewing, and various kinds of timing of the inner hook. This is preferable in the sense that adjustment can be easily performed.

  The rotational angle position can be derived from a motion diagram or the like according to the sewing conditions.

  Further, the rotation angle position can be stored in the storage unit 33 by the operation of the touch panel 25 described above, for example, by inputting the rotation angle position with a numerical key and confirming with the determination key 29.

  The hook adjustment mode control unit 34 controls the operation of each part when adjusting the timing of the inner hook 6, and when the shift key 26 is operated to shift to the hook adjustment mode, the upper shaft 22 is stored. The sewing machine motor 23 is driven so that the rotational angle position stored in the section 33 can be taken, and then the motor lock mechanism 24 is driven to prevent the sewing machine motor 23 from being driven. A program and data for holding the stop state at the stored rotational angle position are stored.

  The shuttle adjustment mode control unit 34 stores a program and data for using one selected from a plurality of types of rotation angle positions by the selection switch 27.

  Further, the hook adjustment mode control unit 34 includes a program for forcibly moving the rotation angle position of the upper shaft 22 held in the stopped state in accordance with the operation amount of the movement key 28 in the hook adjustment mode. Data is stored.

  That is, when the movement key 28 is operated, the motor lock mechanism 24 is released, the sewing machine motor 23 is driven when the movement key 28 is in an operating state, and when the movement key 28 is no longer operated, the motor lock mechanism 24 is operated. A program and data for holding the upper shaft 22 in a stopped state by driving and preventing the sewing machine motor 23 from being driven are stored.

  Instead of continuously pressing the operation key 28, the sewing machine motor 23 may be driven by a preset angle every time one operation is performed.

  Further, when the movement key 28 is operated, a program and data for causing the display unit 25A to numerically display the rotation angle position where the upper shaft 22 is stopped, that is, the angle may be stored.

  Further, the shuttle adjustment mode control unit 34 has a program for storing the rotation angle position in the storage unit 33 by operating the touch panel 25, for example, inputting the rotation angle position with a numeric key and confirming with the determination key 29. Data is also stored.

  In addition, when storing the rotation angle position, the type and length of the sewing needle N can be stored as an additional attribute such as an individual picture display, a numerical value, a symbol, etc., so that a plurality of types of rotation angle positions can be displayed on the display unit 25A. This is preferable in the sense that the operator can easily identify the rotational angle position for use.

  The shift to the hook adjustment mode is mainly made up of programs and data stored in the hook adjustment mode control unit 34, and the CPU 32 takes charge of the actual calculation.

  The storage unit 33 also includes a program and data for processing various information necessary for executing a sewing operation, a program and data required for executing an initialization operation at power-on, an operating system, a device driver, and the like. It is remembered.

  The other configuration is the same as that of the sewing machine 101 provided with a conventionally known half-turn hook, and therefore detailed description thereof is omitted.

  Next, the operation of the present embodiment having the above-described configuration will be described.

  Since the basic operation control related to sewing is the same as the conventional one, only the operation related to the timing adjustment of the inner hook 6 which is the gist of the present invention will be described below.

  The timing adjustment operation of the inner hook 6 in the sewing machine 1 of the present embodiment starts when the operator operates, that is, touches the transition key 26 displayed on the operation unit 25B of the touch panel 25. When the transition key 26 is operated, the control means 31 enters a hook adjustment mode for adjusting the timing of the inner hook 6.

  Next, in order to move the position of the sewing needle N to a position where the upper thread loop is formed, that is, a position slightly raised from the bottom dead center of the needle bar 2, the operator operates the selection key 27 to store the storage unit 33. The rotation angle position used for adjusting the timing of the inner hook 6 is selected from a plurality of rotation angle positions stored in. When the rotation angle position for timing adjustment of the inner hook 6 is selected, the control means 31 determines the rotation angle position at which the upper shaft 22 is selected based on the program stored in the hook adjustment mode control unit 34. After the sewing machine motor 23 is driven as described above, the motor lock mechanism 24 is driven to prevent the sewing machine motor 23 from being driven. Thereby, the upper shaft 22 holds the stopped state at the selected rotation angle position.

  Next, the operator manually rotates the driver 7 in a non-fixed state in which the driver mounting screw 9 is loosened with respect to the hook shaft 8 in the state in which the upper shaft 22 is held in a stopped state. By aligning the sword tip 6A of the inner hook 6 with the center of the sewing needle N while bringing the portion 7a into contact with the one end 6a of the inner hook 6, the sewing needle N and the sword tip 6A of the inner hook 6 are aligned. .

  Next, the timing adjustment of the inner hook 6 is completed by tightening the driver mounting screw 9 and attaching and fixing the driver 7 to the hook shaft 8 in the aligned state.

  At this time, since the upper shaft 22 is held in a stopped state, even when a rotational force is applied to the hook shaft 8 when the driver 7 is moved or the driver mounting screw 9 is tightened, the hook shaft 8, As a result, it is possible to easily and reliably prevent the upper shaft 22 from rotating and the rotational angle position of the upper shaft 22 from shifting in the rotational direction.

  As described above, according to the sewing machine 1 of the present embodiment, the sewing machine motor 23 is driven so that the upper shaft 22 as the sewing machine main shaft can take the rotation angle position stored in the storage unit 33 when the shuttle adjustment mode is entered. After that, by driving the motor lock mechanism 24 to prevent the sewing machine motor 23 from being driven, the upper shaft 22 is formed so as to hold the stopped state at the rotational angle position stored in the storage unit 33. When adjusting the timing of the inner hook 6, even if a rotational force is applied to the hook shaft 8, the hook shaft 8 and thus the upper shaft 22 rotate, and the rotational angle position of the upper shaft 22 shifts in the rotational direction. Can be easily and reliably prevented. As a result, unlike the conventional case, it is not necessary to repeatedly confirm that there is no shift in the rotational angle position of the upper shaft 22 by tightening the driver mounting screw 9, so that the timing adjustment of the inner hook 6 is easily and reliably performed. be able to.

  Therefore, according to the sewing machine 1 of the present embodiment, usability can be significantly improved compared to the conventional sewing machine 101.

  Further, according to the sewing machine 1 of the present embodiment, the storage unit 33 stores a plurality of types of rotation angle positions as the rotation angle position of the upper shaft 22 as a sewing machine main shaft that is set in advance for use in the shuttle adjustment mode. When the mode shifts to the hook adjustment mode, a selection key 27 is provided as a selection switch for selecting one to be used for timing adjustment of the inner hook 6 from a plurality of rotation angle positions. When the timing of the inner hook 6 is adjusted by a simple operation of operating 27, the rotational angle position of the upper shaft 22 varies depending on the thickness of the sewing object, the sewing needle N used for sewing, the sewing conditions such as the thread, and the like. Can be set easily and reliably.

  That is, according to the sewing machine 1 of the present embodiment, a plurality of types of rotational angle positions are stored in the storage unit 33, and when the timing adjustment of the inner hook 6 is performed, a plurality of types stored in the storage unit are stored. It is possible to easily and surely set various rotational angle positions of the upper shaft 22 which are different depending on the sewing conditions by a simple method of selecting the one used for adjusting the timing of the inner hook 6 from the rotational angle position by the selection key 27. it can.

  Further, according to the sewing machine 1 of the present embodiment, since the movement key 28 is provided as a main shaft rotation switch for forcibly moving the rotation angle position of the upper shaft 22 held in the stopped state, the sewing is performed. The interference of the inner hook 6 with the needle N and the interference of the driver 7 with the sewing needle N can be easily confirmed by operating the movement key 28. Further, the timing of the inner hook 6 can be adjusted while confirming the angle and position of the inner hook 6 and the driver 7 with respect to the sewing needle N, and when the timing adjustment of the inner hook 6 is performed, a series of operations are performed. The distance between the inner hook 6 and the sewing needle N, and the distance between the driver 7 and the sewing needle N can be easily adjusted.

  Further, according to the sewing machine 1 of the present embodiment, since the rotational angle position of the upper shaft 22 is stored in the storage unit 33, when the mode is shifted to the hook adjustment mode, the rotational angle position of the upper shaft 22 is repeatedly set without variation. Inconveniently occurring when the rotational angle position of the upper shaft 22 is set by visually matching the score line 2a formed on the conventional needle bar 2 with the lower end 11a of the needle bar metal 11. Can also be prevented.

  Specifically, in the conventional sewing machine 101, the engraved line 2a of the needle bar 2 is formed by being engraved with a blade, so that “the width of the engraved line 2a itself varies”, “the engraved line 2a The position of the rotation angle of the upper shaft 22 is set according to, for example, the position in the width where the lower end 11a of the needle bar metal 11 is to be aligned varies depending on the operator, the physical condition of the operator, the presence or absence of time allowance, illuminance, etc. Therefore, the sewing product quality for each individual sewing machine 101 is not stable.

  On the other hand, in the sewing machine 1 of the present embodiment, the rotational angle position of the upper shaft 22 can be set accurately, so that the quality of the sewing product for each individual sewing machine 1 can be easily stabilized.

  Note that according to the sewing machine 1 of the present embodiment, the rotation angle position of the upper shaft 22 can be forcibly changed by operating the movement key 28, so that the balance angle with respect to the rotation angle position of the upper shaft 22, There is also a secondary effect that each mechanism such as the opening / closing timing of the thread tension plate and the driving timing of the thread trimming knife and the operation timing and mounting state of the parts can be easily examined and confirmed.

  The present invention is not limited to the above-described embodiments, and various modifications can be made as necessary.

The perspective view which shows the principal part of embodiment of the sewing machine which concerns on this invention Block diagram of essential parts of the sewing machine of FIG. The perspective view which shows the principal part of the sewing machine provided with the conventional half turn hook The front view which shows the driver of the sewing machine of FIG. Explanatory drawing explaining the position setting state of the needle bar of the sewing machine of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Needle bar 4 Half turn hook 5 Large hook 6 Middle hook 6A Blade tip 7 Driver 8 Hook shaft 10 Lower shaft 21 Needle bar drive mechanism 22 Upper shaft 23 Sewing motor 24 Motor lock mechanism 25 Touch panel 26 Transition key 27 Selection key 28 Move key 31 Control means 32 CPU
33 Memory 34 Hook adjustment mode controller N Sewing needle

Claims (3)

A sewing machine motor for rotationally driving the sewing machine spindle;
A sewing needle that is reciprocated in the vertical direction in conjunction with rotation of the sewing machine spindle;
A shuttle shaft that is swung in conjunction with rotation of the sewing machine main shaft;
A cauldron, an inner hook that has a sword tip that captures a loop of an upper thread that is incorporated inside the cauldron and is inserted through a sewing needle, and that rotatably supports a lower thread bobbin, and A half-turn hook provided with a screwdriver detachably attached to the hook shaft;
In a sewing machine having a control unit having a calculation unit and a storage unit for controlling the operation of each unit,
A motor lock mechanism for locking the drive of the sewing machine motor in a stopped state of the sewing machine motor;
A hook adjustment mode transition switch for shifting to a hook adjustment mode for adjusting the timing of the inner hook;
The storage unit stores a rotational angle position of the sewing machine spindle that is set in advance for use in the shuttle adjustment mode,
The control means drives the sewing machine motor so that the sewing machine main shaft can take the rotational angle position stored in the storage unit, and then drives the motor lock mechanism to move to the shuttle adjustment mode. The sewing machine is characterized in that the sewing machine main shaft is held in a stopped state at the rotational angle position stored in the storage unit by preventing the driving of the sewing machine motor. The rotation angle position is a plurality of types,
2. The switch according to claim 1, further comprising a selection switch for selecting one used for timing adjustment of the inner hook from the plurality of types of rotation angle positions when the hook adjustment mode is entered. sewing machine.   The main shaft rotation switch for forcibly moving the rotational angle position of the sewing machine main shaft held in a stopped state when the shuttle adjustment mode is entered is provided. Item 3. The sewing machine according to Item 2.

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