JP2008259719A - Embroidery sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an embroidery sewing machine improving work efficiency in permanent sewing and securing the quality of a sewn material. <P>SOLUTION: This embroidery sewing machine includes: a bobbin thread bobbin winder complete 31 for supplying bobbin thread to a bobbin 12 without removing the bobbin 12 from a shuttle/hook; and an embroider device 21 for embroidering the sewing material S held on an embroidery frame 23 moving in the X direction and in the Y direction orthogonal to each other, taking a needle location point at a bed part 2a as an origin, wherein in running short of bobbin thread wound around the bobbin 12, the embroidery frame 23 is moved to perform permanent sewing with the bobbin thread remaining on the bobbin 12 in an area having the largest gap G between the embroidery frame 23 and the outline EAO of embroidery in a blank area BA where embroidery ES is not formed outside of an embroidery formation area EA where the embroidery ES for the sewing material S held on the embroidery frame 23 is formed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an embroidery sewing machine, and more particularly to an embroidery sewing machine suitable for pulling out a lower thread remaining on a bobbin in a configuration including a lower thread winding device.

  2. Description of the Related Art Conventionally, an embroidery sewing machine is known in which an embroidery device for performing embroidery sewing on a sewn product is detachably provided. As one type of such an embroidery sewing machine, an apparatus provided with a bobbin thread winding device that can supply bobbin thread to a bobbin without removing the bobbin from the hook has been proposed.

  In addition, in an embroidery sewing machine equipped with a bobbin thread winding device, if the bobbin thread wound around the bobbin decreases during the sewing operation, the bobbin thread winding device must be pulled out from the bobbin if the bobbin thread remaining on the bobbin is not completely pulled out. Will interfere with the supply of bobbin thread to the bobbin.

  In view of this, an embroidery sewing machine has been proposed in which the lower thread remaining on the bobbin can be sewn to the corner of the sewing product in order to completely pull out the lower thread remaining on the bobbin (see, for example, Patent Document 1).

JP 2002-355476 A

  However, in the conventional embroidery sewing machine, there is a problem in that it is impossible to improve the workability and ensure the quality of the sewn product due to the abandoned sewing at the corner of the sewn product. .

  In other words, in a conventional embroidery sewing machine, depending on the size and position of the embroidery, the position of the sewing stitch may be close to the embroidery frame or close to the embroidery. Then, after the end of the sewing, the operator uses the scissors to cut the discarded thread that exists so as to connect the end of the embroidery seam and the starting point of the sewing on the sewing product. There is a problem that it is difficult to insert the tip of one of the blades between the sewing product and the waste thread and the workability is poor.

  In addition, it is difficult to insert the tip of one blade of the cutting scissors between the sewing product and the waste thread, so that the quality of the sewing product is ensured by damaging the embroidery or the sewing product with the scissors. There was also a problem that it was not possible.

  Therefore, there is a demand for an embroidery sewing machine that can improve the workability of the sewing operation and ensure the quality of the sewing product.

  The present invention has been made in view of this point, and it is an object of the present invention to provide an embroidery sewing machine that can improve workability during a sewing operation and ensure the quality of a sewing product.

  In order to achieve the above-mentioned object, the embroidery sewing machine according to the present invention is characterized in that a bobbin thread winding device for supplying bobbin thread to the bobbin without removing the bobbin from the shuttle and a needle drop point at the bed portion as the origin. An embroidery device for performing embroidery sewing on a sewing product held in an embroidery frame that moves in the X and Y directions perpendicular to the embroidery, and when the bobbin thread wound around the bobbin is reduced, the embroidery By moving the frame and discarding the lower thread remaining on the bobbin to the blank area where the embroidery is not formed on the outside of the embroidery forming area where the embroidery of the sewing product held on the embroidery frame is formed, In the embroidery sewing machine configured to be pulled out, the abandoned sewing is formed so that the space between the embroidery frame and the embroidery contour is the widest in the blank area. That. By adopting such a configuration, the position of the sewing stitch does not approach the embroidery frame or the embroidery. Therefore, the tip of one blade of the cutting scissors is connected to the sewing product and the sewing thread during the sewing operation. And the embroidery or the sewing product is not damaged by scissors.

  For each type of the embroidery frame, a plurality of sewing start positions for starting abandonment sewing are set in advance in the embroidery frame, and the abandonment sewing is performed among the plurality of the sewing start positions. It is preferable that the embroidery frame is formed so as to be selected by selecting a sewing start position existing in the widest area and using the selected sewing start position as a needle drop point.

  A priority order is set for the plurality of sewing start positions, and when there are a plurality of sewing start positions belonging to the widest area, a sewing start position with the highest priority is selected. It is preferable that

  It is preferable that the embroidery frame is formed in a rectangular shape, and the sewing start positions of the plurality of places are set at least on each side of the four sides of the embroidery frame.

  It is preferable that the discard sewing is formed so that the sewing direction is linearly along the X direction or the Y direction.

  According to the embroidery sewing machine of the present invention, since the discard sewing is performed in the region where the distance between the embroidery frame and the embroidery contour is the widest, the position of the discard sewing does not approach the embroidery frame or the embroidery. At the time of processing, it is easy to insert the tip of one blade of the cutting scissors between the sewing product and the waste thread, and the embroidery or the sewing product is not damaged by the scissors. As a result, there are excellent effects such as improvement in workability at the time of the sewing operation and ensuring of the quality of the sewing product.

  The present invention will be described below with reference to embodiments shown in the drawings.

  1 to 4 show an embodiment of an embroidery sewing machine according to the present invention, FIG. 1 is an external perspective view, FIG. 2 is an enlarged perspective view in the vicinity of a bobbin thread winding device, and FIG. 3 is a limit sensor and a remaining amount sensor. FIG. 4 is a block diagram showing the configuration of the main part.

  Since the embroidery sewing machine of this embodiment has the same configuration as a conventionally known embroidery sewing machine, an outline of the configuration of the main part will be described below.

  The sewing machine frame 2 of the embroidery sewing machine 1 of the present embodiment includes a bed portion 2a, an arm portion 2b extending above the bed portion 2a in parallel with the bed portion 2a, a bed portion 2a, and an arm portion 2b, as in the prior art. Is formed in a substantially U-shape as a whole having a connecting body portion 2c connecting the right and left sides of FIG.

  A jaw portion 2d protruding toward the bed portion 2a is formed on the free end side shown on the left side of FIG. 1 opposite to the base end side located on the connecting barrel portion side shown on the right side of FIG. 1 of the arm portion 2b. The lower end of the needle bar 3 (FIG. 2) is disposed at a desired position on the lower surface of the jaw 2d facing the bed 2a so as to protrude toward the bed 2a. The needle bar 3 is rotatably disposed inside the arm portion 2b and is connected to the rotation of a main shaft (upper shaft) (not shown) that is driven to rotate by a sewing machine motor 4 (FIG. 4). )) And can be reciprocated with a predetermined stroke along the vertical direction. And the base end part of the needle | hook 5 (FIG. 2) is attached to the lower end part of the needle bar 3 so that attachment or detachment is possible. That is, the needle 5 is arranged with its longitudinal direction directed in the vertical direction, and is reciprocable with a predetermined stroke along the vertical direction together with the needle bar 3. Further, the presser foot 6 for pressing the sewing product S from above is disposed at the lower end portion of the jaw portion 2d.

  The bed portion 2a is provided with a lower thread piece mounting portion 7 at a position close to the connecting body portion 2c. The lower thread piece mounting portion 7 is configured to freely rotate a lower thread yarn piece 8. A supporting spool 9 is arranged.

  A known embroidery device 21 having a substantially U-shaped plane is detachably attached to the upper surface of the bed portion 2a. The embroidery device 21 is mounted with an embroidery frame 23 on a carriage 22, and a sewing product S is set on the embroidery frame 23, and the embroidery frame 23 is attached by an X motor 24 and a Y motor 25 (FIG. 4) in the carriage 22. An embroidery stitch of a predetermined shape can be performed in cooperation with the needle 5 while moving in the X and Y directions orthogonal to each other with the needle drop point in the bed portion 2a as the origin.

  As indicated by a double arrow in FIG. 1, the X direction in the present embodiment is a direction along the longitudinal direction of the arm portion 2b, and the Y direction is a direction orthogonal to the longitudinal direction of the arm portion. is there.

  The embroidery device 21 is provided with a frame sensor 26 (FIG. 4) for detecting whether the embroidery frame 23 is attached to the carriage 22 of the embroidery device 21 and the type (shape, size, etc.) of the embroidery frame 23. Yes.

  As the frame sensor 26, an identification mark provided on the embroidery frame 23 can be read in a non-contact manner (an image sensor, an optical sensor, or the like), or a contact that outputs a signal by contact by attaching the embroidery frame 23. A sensor of a type (limit switch etc.) can be mentioned. In the case where a contact type sensor is used, the type of the embroidery frame 23 may be determined based on a combination of sensors that are operated by arranging a plurality of sensors. Further, the shape of the embroidery frame 23 is generally a square including a square and a rectangle, and various shapes such as an ellipse and a circle are used as necessary.

  A bobbin thread winding device 31 is disposed at a position below the needle plate 10 inside the bed portion 2a. As shown in FIG. 2, the lower thread winding device 31 basically includes a needle bar cutting mechanism or upper shaft crank mechanism (not shown), a bobbin driving member (not shown) connected to the outer hook 11a by a gear, and a bobbin driving mechanism. A member moving means 32, a thread holding / moving member 33, a thread holding member moving means 34, and the like are provided.

  The bobbin thread winding device 31 separates the needle bar 3 attached with the needle 5 from the rotation of the sewing machine main shaft by the needle bar cutting mechanism or the upper motor crank mechanism to separate the sewing machine motor 4 and the sewing machine main shaft during the thread winding operation. Thus, the vertical movement of the needle bar 3 is stopped, and the needle bar 3 can be held above the needle plate 10 on the hook 11 (horizontal hook).

  On the other hand, the yarn holding member moving means 34 is driven by the drive motor 35, the yarn holding member moving means 34 rotates the yarn holding member 48, and the tip of the yarn holding member is raised along the outer hook 11a. Further, it is advanced toward the inner hook 11b and brought into contact with the upper flange 13 of the bobbin 12 in the inner hook 11b. At this time, the front end portion of the thread holding member 48 regulates the position of the lower thread derived from the lower thread thread piece 8 (the upper thread derived from the upper thread thread may be used as the lower thread). The thread portion between the thread position regulating portion and the holding portion is pressed against the outer peripheral edge of the upper flange 13 of the bobbin 22. ing.

  Then, the bobbin driving member moving means 32 is actuated by the thread holding member moving means 34 to drive and raise the bobbin driving member penetrating the inside of the small diameter portion at the lower portion of the outer hook 11a, via the gear at the upper end of the bobbin driving member. The gear of the outer hook 11a and the gear in the lower flange of the bobbin 12 are connected. The outer hook 11a is driven to rotate by the rotation of the lower shaft in conjunction with the rotation of the sewing machine main shaft via a screw gear (the bobbin driving member passes through the screw gear) fixed to the lower portion of the small diameter portion. It has become. When the outer hook 11a is rotated forward in the direction of the arrow A shown in FIG. 2 by the driving force of the lower shaft that is driven to rotate in conjunction with the sewing machine main shaft by the driving of the sewing machine motor 4, the bobbin 12 rotates (the outer hook 11a ), The yarn portion at the tip of the yarn holding member 48 pressed against the outer peripheral edge of the upper flange 13 is captured by the slit 14 of the upper flange 13, and the yarn portion following this is applied to the tension applying means 36 and The lower thread is pulled out from the bobbin thread spool 8 via a thread tensioner (not shown) and the lower thread is wound around the central shaft 15 (FIG. 3) of the bobbin 12 (when using the upper thread) Is pulled from the upper thread piece).

  That is, the bobbin thread winding device 31 can supply bobbin thread (winding) to the bobbin 12 without removing the bobbin 12 from the hook 8.

  As shown in FIG. 3, the lower thread winding device 31 includes a limit sensor 41 as maximum thread winding diameter detecting means for detecting the maximum thread winding diameter of the lower thread wound around the bobbin 12, and a bobbin 12 lower thread. A remaining amount sensor 42 as a lower yarn remaining amount detecting means for detecting the amount of lower yarn remaining on the bobbin 12 when it is consumed and reduced is disposed.

  The limit sensor 41 is formed by an optical sensor having a light emitting element 41a and a light receiving element 41b that are opposed to each other in the vicinity of the upper end of the outer hook 11a, and the light emitted from the light emitting element 41a is the central axis 15 of the bobbin 12. The winding layer surface 43 wound around the set maximum bobbin winding diameter is arranged so as to be detected at a position between the upper flange 13 and the lower flange of the bobbin 12.

  The limit sensor 41 does not block the optical path 41c until the bobbin thread wound around the bobbin 12 reaches the maximum winding diameter, and the light receiving element 41b continues to be ON and outputs the maximum current. When the maximum winding diameter is reached, the optical path 41c is blocked, the light receiving element 41b is turned OFF, the output current is reduced, and the minimum current at the detection level is output. Therefore, if a threshold is provided between the maximum output current and the minimum output current and it is detected that the light receiving element 41b is turned off, it is detected that the lower thread wound around the bobbin 12 has reached the maximum thread winding diameter. It is possible to know that the lower thread has been wound up. The detection of the maximum bobbin diameter is sent to a control means 51 (to be described later) that controls the lower thread winding device 31 and each part of the sewing machine for signal processing, and is finally realized by the CPU 52 of the control means 51. It has become so.

  Similar to the limit sensor 41, the remaining amount sensor 42 is formed by an optical sensor having a light emitting element 42a and a light receiving element 42b disposed in the vicinity of the upper end of the outer hook 11a, except for the optical path 42c. It is formed in the same manner as the limit sensor 41. The optical path 42 c of the light emitted from the light emitting element 42 a of the remaining amount sensor 42 to the light receiving element 42 b is located near the surface of the central axis 15 of the bobbin 12.

  The remaining amount sensor 42 has less bobbin thread left on the bobbin 12, and the optical path 42c is blocked until the remaining amount is reduced to, for example, about 3 to 4 turns depending on the thickness of the thread. If the light receiving element 42b continues to be turned OFF and the remaining amount of the lower thread becomes smaller than that, the light path 42c is not blocked, and the light receiving element 42b is turned ON. Therefore, if a threshold is provided between the minimum output current at the OFF time and the maximum output current at the ON time to detect that the light receiving element 42b is turned ON, the remaining amount of the lower thread remaining on the bobbin 12 is equal to or less than a predetermined value. It is possible to detect the no-yarn state. The output signal from the light receiving element 42b of the remaining amount sensor 42 is sent to the control means 51 as in the case of the limit sensor 41. The yarn amount is detected.

  The control means 51 of the embroidery sewing machine 1 of the present embodiment is formed by a microcomputer. As shown in FIG. 4, at least a CPU 52 (microprocessor) and a ROM having an appropriate capacity electrically connected to the CPU 52. , A memory 53 formed by a RAM or the like, and a system controller (not shown).

  The control means 51 includes at least a sewing machine motor 4 (which uses an AC servo motor, a pulse motor, etc.) for rotationally driving a sewing machine main shaft (upper shaft), and an embroidery frame 23 of the embroidery device 21 in the X direction (lateral direction). An X motor 12a to be moved, a Y motor 12b to be moved in the Y direction (longitudinal direction) (a pulse motor or the like is used), a drive motor 35 for driving the thread holding member moving means 34 of the lower thread winding device 31, and a needle swing mechanism 61, a needle swing motor 62 serving as a drive source, a drive motor 72 and solenoid 73 of the needle thread feeding mechanism 71, a pattern display, a warning display, and a restart notification display on the operation panel of the sewing machine. The display screen 82 which is also used is electrically connected. These external devices are connected via a drive circuit (controller: drive driver) for driving each external device.

  The control means 51 further includes a limit sensor 41 as maximum thread winding diameter detecting means for detecting the maximum thread winding diameter of the bobbin thread wound around the bobbin, no bobbin 22 bobbin thread remaining, and the remaining bobbin thread amount at that time A remaining amount sensor 42 as a lower thread remaining amount detecting means for detecting the presence of the embroidery frame 23 on the carriage of the embroidery device 21, and a frame for detecting the type (shape, size, etc.) of the embroidery frame 23 Various sensors such as the sensor 26 are also connected.

  Various sensors include a dedicated lower thread holding detection sensor, an embroidery device sensor for detecting the attachment / detachment state of the embroidery device 21, a cloth thickness sensor for detecting the thickness of the sewing product S from the height position of the presser foot, and rotation of the sewing machine main shaft. A spindle sensor for detecting an angle, an upper thread detection sensor, a retracted position sensor, and the like can be given.

  The control means 51 further includes a pattern selection switch, a winding thread setting switch, a thread winding amount setting switch, a thread winding start / stop switch, a thread winding mode switching switch, a restart mode switching switch, a sewing start / stop switch, a reverse stitching switch, a thread Various switches used for the operation of the sewing machine such as a cutting switch, a sewing speed adjusting volume switch, and a power switch are also connected.

  As previously known, the CPU 52 includes an arithmetic unit composed of an ALU and an accumulator, a control unit composed of an instruction register, an instruction decoder, a control signal transmission circuit, etc., a program counter, a stack pointer, a general-purpose register (internal The register unit is composed of a register), and detailed description thereof is omitted.

  The memory 53 may be provided with a nonvolatile memory capable of rewriting data according to the design concept and the like. Examples of the non-volatile memory include an EEPROM and a flash memory. Further, it may be a removable memory card or a flash memory. In addition, you may use a hard disk as needed, such as a design concept.

  In the memory 53, when at least the lower thread wound around the bobbin 12 is reduced, the embroidery frame 23 is moved and the lower thread remaining on the bobbin 12 is embroidered on the sewing product S held on the embroidery frame 23. In order to pull out from the bobbin 12 by sewing to the blank area BA (FIG. 6) where the embroidery ES is not formed outside the embroidery formation area EA (FIG. 6) where the ES (sewing pattern of embroidery sewing: FIG. 6) is formed. There is provided a sewing operation control unit 53a in which the program and data are stored.

  That is, when the remaining amount sensor 42 detects that the lower thread is low and outputs a lower thread no-feed signal to the discarding operation control unit 53a, the sewing operation being executed is interrupted in the middle of embroidery sewing. Then, after the needle 5 is moved above the sewing product S, the sewing machine motor 4 is stopped, and then the X in the carriage 22 of the embroidery device 21 is pulled out in order to pull out the lower thread remaining on the bobbin 12. A program and data for controlling the operation of each part of the sewing machine are stored so that the motor 24 and the Y motor 25 are driven to move the embroidery frame 23 and perform sewing in the blank area BA of the sewing product S.

  As a program and data for performing such abandoned sewing, the gap G (FIG. 6) between the embroidery frame 23 in the blank area and the outline EAO (FIG. 6) of the embroidery (embroidery sewing pattern) ES is the widest. Examples thereof include those formed in the region BMA (FIG. 6).

  Specifically, for each type of the embroidery frame 23, a plurality of disposal start positions P (FIG. 6) for starting the disposal sewing are set in the embroidery frame 23 in advance, and the disposal sewing is performed at a plurality of locations. The sewing start position P existing in the widest area BMA among the sewing start positions P can be selected, and the embroidery frame 23 can be moved so that the selected sewing start position P is a needle drop point. Things can be mentioned.

  In this case, priority is set for the plurality of sewing start positions P, and when there are a plurality of sewing start positions P belonging to the widest region BMA, the sewing start position P having the highest priority is selected. It is preferable to be formed so as to be selected.

  As shown in FIG. 6, when the embroidery frame 23 is formed in a rectangular shape, the multiple sewing start positions P are set at least on each side of the four sides 23 </ b> A of the embroidery frame 23. It is preferable. Further, it is preferable that the sewing direction of the discard sewing is formed so as to be linear along the X direction or the Y direction. This discard sewing operation will be described in detail later.

  The memory 53 stores a program and data for performing an initialization operation when the power is turned on, a program and data for performing a thread winding operation for supplying (winding) a bobbin thread to the bobbin, and an operation related to embroidery sewing. Various programs and data such as programs and data for performing the above are also stored.

  Since the detailed configuration of the embroidery device 21 and the bobbin thread winding device 31 and other configurations are formed in the same manner as a conventional embroidery sewing machine (eg, Patent Document 1), detailed description thereof will be omitted.

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

  Since the rest of the operation of the embroidery sewing machine of the present embodiment is the same as that of the conventional one, the description thereof will be omitted, and only the portion relating to the stitching that is the gist of the present invention will be mainly shown in FIG. The following will be described with reference to FIG.

  FIG. 5 is a flowchart for explaining the sewing operation in the embodiment of the embroidery sewing machine of the present invention. FIG. 6 is an explanatory view showing the relationship between an embroidery frame and abandoned sewing in the embodiment of the embroidery sewing machine of the present invention.

  In the embroidery sewing machine 1 of the present embodiment, as in the conventional case, when the remaining amount sensor 42 detects that the lower thread has decreased and outputs a lower threadless signal to the control means 51, specifically the CPU 52, the sewing operation The embroidery sewing operation being executed is interrupted in the middle of the operation, and the sewing operation for pulling out the lower thread remaining on the bobbin 12 is performed.

  That is, when the absence of the lower thread is detected, the sewing operation is interrupted, the needle 5 is moved above the sewing product S, and then the sewing machine motor 4 is stopped. Subsequently, the X motor 24 and the Y motor 25 in the carriage 22 of the embroidery device 21 are driven to move the embroidery frame 23 to perform the sewing operation.

  The discard sewing operation of the embroidery sewing machine 1 according to the present embodiment acquires the type (shape and size) of the embroidery frame 23 in step ST01 shown in FIG. 5 based on the program and data stored in the discard operation control unit 53a. Then, the process proceeds to the next step ST02.

  Here, the acquisition of the type of the embroidery frame 23, that is, the determination of the type of the embroidery frame 23 is performed by the CPU 52 in response to a detection signal from the frame sensor 26.

  That is, the CPU 52 determines the type, more specifically, the shape and size of the embroidery frame 23 based on the frame data stored in advance in the memory 53 in response to the detection signal from the frame sensor 26. The frame data is preferably a data table of detection signals from the frame sensor 26 and the type of the embroidery frame 23 in the sense that the processing speed can be easily increased.

  Next, in step ST02, the CPU 52 determines the embroidery frame in the blank area BA in which the embroidery ES outside the embroidery formation area EA where the embroidery ES of the sewing product S held in the embroidery frame 23 shown in FIG. The calculation for moving the embroidery frame 23 is performed so that the distance G between the embroidery ES and the contour EAO of the embroidery ES is the widest region BMA, and the process proceeds to the next step ST03.

  That is, for each type of the embroidery frame 23, a plurality of sewing start positions P for starting abandonment sewing are set in advance in the embroidery frame 23.

  For example, as shown in FIG. 6, when the embroidery frame 23 is a rectangle long in the X direction, at least four sides of the embroidery frame 23 are the right side 12A1 in FIG. 6, the upper side 12A2 in FIG. 6, the left side 12A3 in FIG. Sewing start positions P1, P2, P3, and P4 are set on each side of the lower side 12A4. Examples of the setting positions of these sewing start positions P (reference numeral P is a generic name of the four sewing start positions P1, P2, P3, and P4) are, for example, four sides 23A of the embroidery frame 23 (reference numeral 23A is 4). The positions 12A1, 12A2, 12A3, and 12A4 are collectively referred to as 10 mm away from each other, and 15 mm away from the adjacent side 23A in the clockwise direction with the center CA of the embroidery frame 23 as the origin.

  Specifically, the closing start position P1 located on the right side 12A1 side of the embroidery frame 23 shown in FIG. 6 is set at a position 10 mm away from the right side 12A1 and 15 mm away from the lower side 12A4 side. Further, the sewing start position P2 located on the upper side 12A2 side of the embroidery frame 23 shown in FIG. 6 is set at a position 10 mm away from the upper side 12A2 and 15 mm away from the right side 12A1 side. Furthermore, the sewing start position P3 located on the left side 12A3 side of the embroidery frame 23 shown in FIG. 6 is set at a position 10 mm away from the left side 12A3 and 15 mm away from the upper side 12A2 side. Furthermore, the sewing start position P4 located on the lower side 12A4 side of the embroidery frame 23 shown in FIG. 6 is set at a position 10 mm away from the lower side 12A4 and 15 mm away from the left side 12A3 side.

  The set position and number of the sewing start position P may be stored in advance as incidental attributes of the frame data stored in the memory 53 in advance.

  The embroidery device 21 is set so that the center CA of the embroidery frame 23 becomes the needle drop point in the initialization operation when the power of the sewing machine is turned on.

  Next, intervals G1, G2, G3, and G4 between each of the four sides 23A of the embroidery frame 23 and each of the outlines EAO of the embroidery ES that oppose them are calculated.

  At this time, the interval G (the symbol G generically refers to the intervals G1, G2, G3, and G4) can be expressed by the offset amount of the center CE of the embroidery ES with respect to the center CA of the embroidery frame 23. Rather than using the embroidery formation area EA surrounded by the outline EAO of the embroidery ES indicated by an ellipse that is long in the direction, a rectangular virtual embroidery formation area EAA that is inscribed by the embroidery formation area EA indicated by a two-dot chain line in FIG. It is preferable to increase the calculation speed.

  The virtual embroidery formation area EAA may be set in advance as incidental information of the sewing data (embroidery data) of the embroidery ES stored in the memory 53. Accordingly, by selecting an embroidery ES to be used for sewing from a wide variety of embroidery ES, it becomes easy to calculate the interval G with respect to the embroidery frame 23 to be used for sewing.

  Of course, the setting position and number of the sewing start position P can be selected from arbitrary integers according to the type of the embroidery frame 23 and the design concept.

  For example, when the shape of the embroidery frame 23 is an ellipse, the embroidery frame 23 may be provided at a total of four locations, at least two major axis sides and two minor axis sides.

  Next, in order to select which of the four discarding start positions P is used for actual discarding, that is, on which side of the four sides 23A, the actual discarding is performed as follows. In step ST03 to step ST05, the largest one of the four intervals G is determined.

  That is, in step ST03, it is determined whether or not the gap G2 on the upper side 12A2 side in FIG. 6 is the largest (G2> G1, G2> G3, G2> G4), and if the determination result is YES (largest), The process proceeds to step ST06.

  If the determination result in step ST03 is NO (not the largest), the process proceeds to the next step ST04, where the gap G4 on the lower side 12A4 side of FIG. 6 is the largest (G4> G1, G4> G2, G4> G3) is determined, and if the determination result is YES (largest), the process proceeds to the next step ST06.

  If the determination result in step ST04 is NO (not the largest), the process proceeds to the next step ST05, and whether the interval G3 on the left side 12A3 side in FIG. 6 is the largest (G3> G1, G3> G2, G3> G4) is determined, and if the determination result is YES (largest), the process proceeds to the next step ST06.

  When the determination result in step ST05 is NO (not the largest), the remaining right side 12A1 in FIG. 6 among the four sides 23A of the embroidery frame 23 is the largest (G1> G2, G1> G3, G1> G4). ) And proceed to the next step ST06.

  It should be noted that three of the four intervals G4 may be determined, and three of the four intervals G may be selected and determined in accordance with the design concept or the like.

  In addition, priorities are set for the four intervals G, and when a plurality of intervals G are the same, the largest interval G may be determined based on the priorities.

  That is, priorities are set in advance for the four sewing start positions P, and when there are a plurality of sewing start positions P belonging to the widest area BMA among the blank areas BA, the sewing start with the highest priority is performed. It is preferable that the position P is selected.

  Therefore, by step ST03 to step ST05, the widest area BMA among the four sewing start positions P (the area BMA in which the gap G between the embroidery frame 23 and the outline EAO of the embroidery ES is the widest in the blank area BA). The existing sewing start position P, in this embodiment, the sewing start position P1 located on the right side 12A1 side in FIG. 6 is selected.

  Next, in step ST06, the stitch needle that interrupts the embroidery sewing operation that is being performed on the embroidery frame 23 in the middle of the sewing operation so that the sewing start position P selected in steps ST03 to ST05 is set as the needle drop point. The movement data for moving in a shortest distance, that is, linearly, from the sewing interruption position PA, which is the dropping point, to the sewing start position P, in this embodiment, to the sewing start position P1 is calculated. The movement data is calculated by the CPU 52 based on the program and data stored in the sewage movement control unit 53a. Based on the calculated movement data, the X motor 24 and the Y motor 25 are driven to move the embroidery frame 23, and the process proceeds to the next step ST07.

  Next, in step ST07, the sewing operation is started with the sewing start position P, in the present embodiment, the sewing start position P1 as a needle drop point, and the process proceeds to the next step ST08.

  The abandoned sewing in the present embodiment is performed from the abating sewing start position P1 toward the upper side 12A2 along the right side 12A1 of the embroidery frame 23.

  In addition, as the direction of abandonment sewing, since it can be performed linearly along the X direction or the Y direction by driving only one of the X motor 24 and the Y motor 12, energy saving is facilitated. It is preferable in the sense that it is possible.

  Needless to say, depending on the shape of the blank area BA formed by the shape of the embroidery frame 23 and the shape of the embroidery ES and the size of the gap G, the direction of abandonment sewing may not be a straight line but may be an arc shape.

  Further, as the sewing data used for the discard sewing, it is preferable to select data corresponding to the selected discard start position P from a plurality of sewing data stored in the memory 53 in advance.

  Next, in step ST08, it is determined whether or not there is no lower thread remaining on the bobbin 12 due to the sewing, that is, whether or not the amount of movement of the embroidery frame 23 has reached a necessary amount for eliminating the lower thread remaining on the bobbin 12. If it is determined that the determination result is NO (the required amount has not been reached), the process proceeds to the next step ST09, the sewing operation is continued, and the process returns to step ST08.

  Here, whether or not the lower thread has run out depends on the thickness of the thread, but for example, the remaining amount of the lower thread remaining on the bobbin 12 at the time when the detection signal from the remaining amount sensor 42 is output. Since it can be predicted in advance, a margin is provided so that the remaining amount of the lower thread remaining on the bobbin 12 at the time when the detection signal from the remaining amount sensor 42 is output is, for example, 1.2 times the predicted value. The remaining amount data is stored in the memory 53 in advance, and it can be determined by whether or not the movement amount of the embroidery frame 2 has reached the remaining amount data stored in the memory 53.

  For example, if the embroidery frame 23 is moved about 50 mm in the Y direction from the embroidery start position P1 toward the upper side 12A2 and the embroidery frame does not protrude from the embroidery frame 23, the upper side 12A2 is further continued. In the case where the embroidery frame 23 protrudes by about 50 mm in the Y direction, the sewing start position P1 is the center so that it moves about 50 mm in the Y direction toward the lower side 12A4 which is the reverse direction. The embroidery frame 23 may be moved so as to reciprocate along the Y direction.

  Of course, the sewing pattern, sewing pitch, and the like of the discard sewing may be set according to the design concept or the like.

  If the result of determination in step ST08 is YES (reached the required amount), the sewing operation is finished.

  When the sewing is completed, there is a sewing operation, that is, the end of the seam of the embroidery ES (sewing interruption position PA) and the starting point of the sewing (sewing start position P) are connected to the sewing product S. The operator cuts the discarded thread to be cut with scissors. Further, the bobbin thread is supplied to the bobbin 12 by the bobbin thread winding device 31.

  As described above, according to the embroidery sewing machine 1 of the present embodiment, the stitches are formed so that the gap G between the embroidery frame 23 and the outline EAO of the embroidery ES is the widest area BMA in the blank area BA. Therefore, depending on the size and position of the embroidery ES, the position of the sewing stitch does not become a position close to the embroidery frame 23 or a position close to the embroidery ES. As a result, after the sewing is finished, the sewing thread S that exists on the sewn product S so as to connect the sewing interruption position PA, which is the end of the seam of the embroidery ES, and the sewing start position P, which is the starting point of the sewing, is connected. When the operator cuts off with scissors, the distance between the sewing interruption position PA and the sewing start position P and the tip of one of the cutting scissors is easily inserted between the sewing product S and the waste thread. It can be made long enough.

  Therefore, according to the embroidery sewing machine 1 of the present embodiment, it is easy to insert the tip of one of the cutting scissors between the sewn product S and the waste thread in the discard sewing process, and the embroidery ES or sewing Since the object S is not damaged with scissors, it is possible to reliably and easily improve the workability during the sewing operation and ensure the quality of the sewing product S.

  Further, according to the embroidery sewing machine 1 of the present embodiment, for each type of the embroidery frame 23, a plurality of disposal start positions P for starting the disposal sewing are set in the embroidery frame 23 in advance. However, the sewing start position P existing in the widest area BMA among the plurality of sewing start positions P is selected, and the embroidery frame 23 is moved so that the selected sewing start position P is set as a needle drop point. Therefore, depending on the size and position of the embroidery ES, it is more certain that the position of the sewing stitch will be close to the embroidery frame 23 or close to the embroidery ES. Can be prevented. As a result, it is possible to more reliably and easily improve the workability at the time of the sewing operation and ensure the quality of the sewn product S.

  Furthermore, according to the embroidery sewing machine 1 of the present embodiment, priority is set for a plurality of sewing start positions P, and when there are a plurality of sewing start positions P belonging to the widest area BMA, priority is given. Since the sewing start position P having the highest rank is selected, the sewing start position P can be selected reliably and easily.

  Furthermore, according to the embroidery sewing machine 1 of the present embodiment, the embroidery frame 23 is formed in a rectangular shape, and the multiple sewing start positions P are set at least on each side of the four sides 23A of the embroidery frame 23. Therefore, it is possible to easily and reliably select the area BMA having the widest gap G between the embroidery frame 23 and the outline EAO of the embroidery ES in the blank area BA.

  Further, according to the embroidery sewing machine 1 of the present embodiment, since the sewing direction of the discard sewing is formed linearly along the X direction or the Y direction, of the X motor 24 and the Y motor 12 Since the sewing can be performed by driving only one of these, energy saving can be easily achieved.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible as needed.

FIG. 2 is an external perspective view showing a main part of an embodiment of an embroidery sewing machine according to the present invention. 1 is an enlarged perspective view of the vicinity of the bobbin thread winding device of the embroidery sewing machine of FIG. The enlarged plan view which shows the arrangement state of the limit sensor and remaining amount sensor of the embroidery sewing machine of FIG. 1 is a block diagram showing the configuration of the main part of the embroidery sewing machine of FIG. Flowchart for explaining the sewing operation of the embroidery sewing machine of FIG. Explanatory drawing which shows the relationship between the embroidery frame of the embroidery machine of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Embroidery sewing machine 2 Sewing machine frame 2a Bed part 11 Horizontal hook 12 Bobbin 21 Embroidery device 23 Embroidery frame 12A, 12A1, 12A2, 12A3, 12A4 Side 24 X motor 25 Y motor 26 Frame sensor 31 Lower thread winding device 42 Remaining thread sensor 51 Control Means 52 CPU
53 Memory 53a Sewing operation controller ES Embroidery EAO (embroidery) contour EA Embroidery formation region EAA Virtual embroidery formation region BA Blank region BMA Widest region G, G1, G2, G3, G4 (Embroidery frame and embroidery contour ) Interval P, P1, P2, P3, P4 Sewing start position PA Sewing interruption position CA (embroidery frame) center CE (embroidery) center S Sewing product

Claims (5)

A bobbin thread winding device for supplying bobbin thread to the bobbin without removing the bobbin from the hook, and sewing held by an embroidery frame that moves in the X and Y directions perpendicular to each other with the needle drop point in the bed as the origin An embroidery device for performing embroidery sewing on an object, and when the bobbin thread wound around the bobbin decreases, the embroidery frame is moved to hold the bobbin thread remaining on the bobbin in the embroidery frame In the embroidery sewing machine configured to be pulled out from the bobbin by sewing in a blank area where embroidery is not formed outside the embroidery formation area where the embroidery of the sewn product is formed,
The embroidery sewing machine is characterized in that the abandoned sewing is performed in an area where the space between the embroidery frame and the embroidery contour is the widest in the blank area. For each type of the embroidery frame, a plurality of sewing start positions are set in advance for starting abandonment sewing inside the embroidery frame,
The embroidery frame is selected so that the sew-off sewing selects a sew-off start position that exists in the widest region among the plurality of sew-off start positions, and uses the selected sew-off start position as a needle drop point. 2. The embroidery sewing machine according to claim 1, wherein the embroidery sewing machine is configured to be moved. Priorities are set for the plurality of locations where the sewing starts,
3. The embroidery sewing machine according to claim 2, wherein when there are a plurality of sewing start positions belonging to the widest area, the sewing start position having the highest priority is selected. The embroidery frame is formed in a rectangular shape;
The embroidery sewing machine according to claim 2 or 3, wherein the plurality of sewn start positions are set at least on each side of the four sides of the embroidery frame.   The embroidery sewing machine according to any one of claims 1 to 4, wherein a sewing direction of the discard sewing is formed linearly along the X direction or the Y direction.

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