Abstract:
A sewing machine includes a sewing portion, a display, a processor, and a memory. The sewing portion is configured to perform sewing on a sewing workpiece. The memory is configured to store computer-readable instructions. The computer-readable instructions, when executed by the processor, cause the sewing machine to perform processes that include determining a plurality of first positions based on embroidery data, causing the display to display an image showing an embroidery pattern and a plurality of feature points superimposed on the image, identifying one of the plurality of first positions indicated by one of the plurality of feature points displayed on the display, identifying, as a second position, an arbitrary position on the sewing workpiece, changing positions of a plurality of stitches identified by the embroidery data, and causing the sewing portion to sew the plurality of stitches based on the changed positions of the plurality of stitches.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to Japanese Patent Application No. 2013-246883 filed Nov. 29, 2013, the content of which is hereby incorporated herein by reference. 
     BACKGROUND 
     The present disclosure relates to a sewing machine that is configured to sew stitches that represent an embroidery pattern. 
     Sewing machines are known that can easily set positions at which stitches that represent an embroidery pattern are to be sewn on a sewing workpiece that is held by an embroidery frame. For example, a known sewing machine can focus a spot light on a work cloth. The sewing machine can set a position of the spot light (an image focus position) as a position at which stitches that represent an embroidery pattern are to be sewn. More specifically, this sewing machine computes coordinates of the positions of the stitches that represent the embroidery pattern such that a position of a center point matches the image focus position of the spot light. The center point is a point that is computed based on embroidery data that is used to sew the stitches that represent the embroidery pattern. 
     SUMMARY  
     With the above-described sewing machine, the position of the center point with respect to the embroidery pattern is computed and set based on the embroidery data. Accordingly, the position of the center point cannot be changed to a position that is desired by a user. Therefore, even if the user specifies the image focus position of the spot light on the work cloth, there is a case in which the positions at which the stitches that represent the embroidery pattern are to be sewn are not set to positions desired by the user. In this case, the user needs to adjust the image focus position of the spot light as necessary, such that the stitches that represent the embroidery pattern are set to the desired positions. 
     Embodiments of the broad principles derived herein provide a sewing machine that can accurately set positions at which stitches that represent an embroidery pattern are to be sewn to positions desired by a user. 
     Embodiments provide a sewing machine that includes a sewing portion, a display, a processor, and a memory. The sewing portion is configured to perform sewing on a sewing workpiece. The display is configured to display information. The information includes an image. The memory is configured to store computer-readable instruction. The computer-readable instructions, when executed by the processor, cause the sewing machine to perform processes that includes determining a plurality of first positions based on embroidery data, the plurality of first positions indicating a plurality of positions with respect to an embroidery pattern, and the embroidery data identifying positions of a plurality of stitches that represent the embroidery pattern, causing the display to display an image showing the embroidery pattern and a plurality of feature points superimposed on the image, and the plurality of feature points being marks that respectively indicate the determined plurality of first positions, identifying one of the plurality of first positions indicated by one of the plurality of feature points displayed on the display, identifying, as a second position, an arbitrary position on the sewing workpiece, changing the positions of the plurality of stitches identified by the embroidery data, by aligning the identified one of the plurality of first positions with the identified second position, and causing the sewing portion to sew on the sewing workpiece the plurality of stitches that represent the embroidery pattern, based on the changed positions of the plurality of stitches. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Embodiments will be described below in detail with reference to the accompanying drawings in which: 
         FIG. 1  is a perspective view of a sewing machine and an embroidery frame; 
         FIG. 2  is a plan view of the embroidery frame; 
         FIG. 3  is a block diagram showing an electrical configuration of the sewing machine; 
         FIG. 4  is an explanatory diagram of embroidery data; 
         FIG. 5  is a flowchart of main processing; 
         FIG. 6  is a flowchart of extraction processing; 
         FIG. 7  is a diagram showing an embroidery pattern and a plurality of feature points that are displayed on a liquid crystal display; 
         FIG. 8  is a flowchart of extraction processing of a first modified example; 
         FIG. 9  is a flowchart of extraction processing of a second modified example; 
         FIG. 10  is an explanatory diagram of an embroidery pattern; 
         FIG. 11  is an explanatory diagram of embroidery data; 
         FIG. 12  is a flowchart of extraction processing of a third modified example; and 
         FIG. 13  is a flowchart of main processing of a fourth modified example. 
     
    
    
     DETAILED DESCRIPTION 
     An embodiment will be explained with reference to the drawings. 
     A configuration of a sewing machine  1  will be explained with reference to  FIGS. 1 and 2 . The top, the bottom, the lower left, the upper right, the upper left, and the lower right of  FIG. 1  respectively correspond to the top, the bottom, the left, the right, the rear, and the front of the sewing machine  1 . The sewing machine  1  is configured to sew an embroidery pattern. As shown in  FIG. 1 , the sewing machine  1  includes a bed  11 , a pillar  12 , and an arm  13 . The bed  11  is a base portion of the sewing machine  1  and extends in the left-right direction. The pillar  12  extends upward from the right end portion of the bed  11 . The arm  13  extends to the left from the upper end portion of the pillar  12 , facing the bed  11 . The left end portion of the arm  13  is a head  14 . 
     A needle plate (not shown in the drawings) is disposed on the top surface of the bed  11 . A feed dog (not shown in the drawings), a feed mechanism  85  (refer to  FIG. 3 ), a feed motor  80  (refer to  FIG. 3 ), and a shuttle mechanism (not shown in the drawings) are provided below the needle plate, namely, inside the bed  11 . The feed dog is driven by the feed mechanism  85 . The feed dog is configured to feed a sewing workpiece in a predetermined feed direction (the front-rear direction of the sewing machine  1 ). The sewing workpiece may, for example, be a work cloth. The feed mechanism  85  is a mechanism that drives the feed dog to move in the up-down direction and the front-rear direction. A bobbin around which a lower thread is wound can be accommodated within the shuttle mechanism. The shuttle mechanism is a mechanism that is configured to sew a stitch on the sewing workpiece in cooperation with a sewing needle  28  that is mounted on the lower end of a needle bar  29 , which will be described below. The feed motor  80  is a pulse motor that drives the feed mechanism  85 . 
     A known embroidery unit  2  can be mounted on and removed from the bed  11 . The embroidery unit  2  is used to sew the embroidery pattern. When the embroidery unit  2  is mounted on the sewing machine  1 , the embroidery unit  2  and the sewing machine  1  are electrically connected. The embroidery unit  2  is configured to move a sewing workpiece  5  that is held by an embroidery frame  53 . The embroidery unit  2  includes a main body portion  51  and carriage  52 . 
     The carriage  52  is provided above the main body portion  51 . The carriage  52  has a substantially rectangular parallelepiped shape that is long in the front-rear direction. The carriage  52  includes a frame holder (not shown in the drawings), a Y axis moving mechanism  88  (refer to  FIG. 3 ), and a Y axis motor  83  (refer to  FIG. 3 ). The embroidery frame  53  can be mounted on or removed from the frame holder. A plurality of embroidery frames that are different in at least one of size and shape may be prepared as the embroidery frame  53 . The frame holder is provided on the right side surface of the carriage  52 . The sewing workpiece  5  that is held by the embroidery frame  53  may be disposed above the bed  11  and below a needle bar  29  and a presser foot  30 . The Y axis moving mechanism  88  is configured to move the frame holder in the front-rear direction (a Y axis direction). By the frame holder being moved in the front-rear direction, the embroidery frame  53  may move the sewing workpiece  5  in the front-rear direction. The Y axis motor  83  drives the Y axis moving mechanism  88 . A CPU  61  (refer to  FIG. 3 ) of the sewing machine  1  controls the Y axis motor  83  in accordance with embroidery data, which is described below. 
     The main body portion  51  internally includes an X axis moving mechanism  87  (refer to  FIG. 3 ) and an X axis motor  82  (refer to  FIG. 3 ). The X axis moving mechanism  87  is configured to move the carriage  52  in the left-right direction (an X axis direction). By the carriage  52  being moved in the left-right direction, the embroidery frame  53  may move the sewing workpiece  5  in the left-right direction. The X axis motor  82  drives the X axis moving mechanism  87 . The CPU  61  of the sewing machine  1  controls the X axis motor  82  in accordance with the embroidery data, which is described below. 
     The liquid crystal display (LCD)  15  is provided on the front surface of the pillar  12 . An image including various items, such as a command, an illustration, a setting value, a message, etc., may be displayed on the LCD  15 . A touch panel  26  is provided on the front surface side of the LCD  15 . The touch panel  26  is configured to detect a pressed position. When the user performs a pressing operation on the touch panel  26  using the user&#39;s finger or a stylus pen (not shown in the drawings), the pressed position may be detected by the touch panel  26 . An item selected on the image may be recognized based on the detected pressed position. Hereinafter, the pressing operation on the touch panel  26  by the user is referred to as a panel operation. By the panel operation, the user may select a pattern that the user desires to sew or may select a command to be executed. 
     A connector (not shown in the drawings) is provided on a right side surface of the pillar  12 . The sewing machine  1  can be connected to an external device via the connector. Examples of the external device include a personal computer (PC), an imaging device, and a mobile terminal. 
     A cover  16  that can be opened and closed is provided on an upper portion of the arm  13 .  FIG. 1  shows the cover  16  in an opened state. A thread spool  20  may be accommodated underneath the cover  16 , that is, substantially in the center of the interior of the arm  13 . A sewing thread (not shown in the drawings) that is wound around the thread spool  20  is supplied to the sewing needle  28  mounted on the needle bar  29 , via a thread guide portion (not shown in the drawings) that is provided in the head  14 . A plurality of operation switches  21  are provided in a lower portion of the front face of the arm  13 . The plurality of operation switches  21  include a start/stop switch. 
     A presser mechanism  90  (refer to  FIG. 3 ), a needle bar up-and-down moving mechanism  84  (refer to  FIG. 3 ), a needle bar swinging mechanism  86  (refer to  FIG. 3 ), a swinging motor  81  (refer to  FIG. 3 ), and the like are provided inside the head  14 . The presser mechanism  90  is configured to drive a presser bar  31 , using a presser motor  89  (refer to  FIG. 3 ) as a driving source. The needle bar up-and-down moving mechanism  84  is configured to drive the needle bar  29  in the up-down direction in accordance with rotation of a drive shaft (not shown in the drawings). The needle bar up-and-down moving mechanism  84  is driven by a sewing machine motor  79  (refer to  FIG. 3 ). The needle bar  29  and the presser bar  31  extend downward from a lower end portion of the head  14 . The sewing needle  28  can be attached to and detached from the lower end of the needle bar  29 . The presser foot  30  can be attached to and detached from the lower end of the presser bar  31 . The presser foot  30  can press against the sewing workpiece  5  from above such that the sewing workpiece  5  can be moved. The needle bar swinging mechanism  86  is configured to swing the needle bar  29  in a direction (the left-right direction) that is orthogonal to the direction (the front-rear direction) in which the sewing workpiece  5  is fed by the feed dog. The swinging motor  81  is a pulse motor that drives the needle bar swinging mechanism  86 . 
     In the sewing machine  1 , when a stitch is sewn using the embroidery unit  2 , the embroidery frame  53  is moved to a needle drop point, which is indicated by an embroidery coordinate system, by the Y axis moving mechanism  88  and the X axis moving mechanism  87 . The embroidery coordinate system is a coordinate system that is unique to the sewing machine  1 . The embroidery coordinate system is a coordinate system of the X axis motor  82  and the Y axis motor  83 , which move the carriage  52 . In the present embodiment, the embroidery coordinate system is defined as follows. The left-right direction of the sewing machine  1  is the X direction. The direction from the left to the right is the X axis plus direction. The front-rear direction of the sewing machine  1  is the Y direction. The direction from the front to the rear is the Y axis plus direction. The needle drop point is a point at which the sewing needle  28  that is disposed vertically above a needle hole (not shown in the drawings) pierces the sewing workpiece  5  when the needle bar  29  is moved downward from above the sewing workpiece  5 . In conjunction with the movement of the embroidery frame  53 , the shuttle mechanism (not shown in the drawings) and the needle bar  29  to which the sewing needle  28  is attached are driven. Thus, stitches that represent a pattern may be sewn on the sewing workpiece  5 . The X axis motor  82 , the Y axis motor  83 , the sewing machine motor  79 , and the like are controlled by the CPU  61  (which will be described below), which is built into the sewing machine  1 , based on embroidery data, which will be described below. When a normal utility stitch, which is not an embroidery pattern, is sewn, the embroidery unit  2  may be removed from the bed  11 . In this state, the sewing may be performed while a sewing workpiece is fed by the feed dog (not shown in the drawings). 
     A physical configuration of the embroidery frame  53  will be explained with reference to  FIG. 2 . As shown in  FIG. 2 , the embroidery frame  53  includes a mounting portion  58  and a clamping portion  54 . The embroidery unit  2  includes the frame holder (not shown in the drawings). The mounting portion  58  may be detachably mounted on the frame holder of the embroidery unit  2  that is mounted on the sewing machine  1 . The clamping portion  54  includes a first frame  55  and a second frame  56 . The clamping portion  54  is configured such that the first frame  55  and the second frame  56  clamp the sewing workpiece  5 . The first frame  55  and the second frame  56  are each a substantially rectangular frame-shaped member whose longer axis extends in the front-rear direction and whose corners are rounded. The inner circumferential shape of the second frame  56  is substantially identical to the outer circumferential shape of the first frame  55 . The first frame  55  is configured to fit into and removed from the second frame  56 . A parting portion  57  is provided on the front side of the second frame  56 . The parting portion  57  divides the second frame  56  in a central portion in a direction in which the front side of the second frame  56  extends. A tightening mechanism is provided in the parting portion  57 . The tightening mechanism is configured to tighten the second frame  56  with respect to the first frame  55 . The sewing workpiece  5  may be clamped between the first frame  55  and the second frame  56  and may be held in a taut state by the tightening mechanism. A sewing area  45  is set within the first frame  55 . The sewing area  45  is an area in which a stitch can be sewn by the sewing machine  1 . The sewing area  45  varies depending on the type of the embroidery frame  53 . A center point  46  is a position of a center of gravity of the sewing area  45 . 
     An electrical configuration of the sewing machine  1  will be explained with reference to  FIG. 3 . A control portion  60  of the sewing machine  1  includes the CPU  61 , a ROM  62 , a RAM  63 , a flash ROM  64 , a communication interface  65 , and an input/output interface  66 . The CPU  61 , the ROM  62 , the RAM  63 , the flash ROM  64 , the communication interface  65 , and the input/output interface  66  are mutually electrically connected via a bus  67 . The ROM  62  stores various programs including a program for the CPU  61  to perform main processing, which will be described below, data, etc. The flash ROM  64  stores a plurality of sets of embroidery data and the like. The communication interface  65  is an interface element to connect the sewing machine  1  to a network  9 . 
     The operation switches  21 , the touch panel  26 , a detection portion  27 , and drive circuits  70  to  76  are electrically connected to the input/output interface  66 . The detection portion  27  may detect whether or not the embroidery frame  53  is mounted on the embroidery unit  2 . Further, the detection portion  27  may detect the type of the embroidery frame  53  mounted on the embroidery unit  2 . The detection portion  27  outputs a detection result to the CPU  61  via the input/output interface  66 . The drive circuits  70  to  76  drive the presser motor  89 , the sewing machine motor  79 , the feed motor  80 , the swinging motor  81 , the X axis motor  82 , the Y axis motor  83 , and the LCD  15 , respectively. 
     The embroidery data will be explained taking an embroidery pattern  200  shown in  FIG. 2  as an example. Hereinafter, the embroidery pattern  200  is simply referred to as the pattern  200 . The left-right direction and the up-down direction of  FIG. 2  respectively correspond to the X direction and the Y direction of the embroidery coordinate system. The pattern  200  is a pattern that represents the capital letters “A” and “B” of the alphabet. The letters “A” and “B” are arranged side by side in the lateral direction. 
       FIG. 4  shows an example of the embroidery data to sew stitches that represent the pattern  200 . Hereinafter, the stitches that represent the pattern  200  are simply referred to as the stitches of the pattern  200 . The embroidery data includes various types of data, such as stitch data, feed data, suspension data and end data. Depending on an embroidery pattern, the embroidery data may not include the feed data and the suspension data. In the stitch data and the feed data, an index is associated with movement amount data. The index indicates a sewing order. The movement amount data indicates a relative movement amount of the embroidery frame  53  in each of the X direction and the Y direction. More specifically, the stitch data indicates a movement amount by which the embroidery frame  53  is moved to sew the stitches of the pattern  200 . The feed data indicates a movement amount when the embroidery frame  53  is moved a relatively large distance without sewing the stitches of the pattern  200 . In the suspension data, the index is associated with data that indicates suspension of a sewing operation. The sewing operation is suspended in order to change stitch colors (exchange the thread spool  20 ). In the end data, the index is associated with data that indicates an end of the sewing operation. As shown in  FIG. 4 , a plurality of sets of the stitch data, a plurality of sets of the feed data, a plurality of sets of the suspension data, and the end data are arranged in the sewing order when the stitches of the pattern  200  are sewn, namely, in an index order. 
     Hereinafter, the stitch data, the feed data, the suspension data and the end data are collectively referred to as control data. The movement amount that is indicated by the movement amount data included in the stitch data is simply referred to as a movement amount of the stitch data. The movement amount that is indicated by the movement amount data included in the feed data is simply referred to as a movement amount of the feed data. 
     The position that is used as a reference for the movement amount of the stitch data and the movement amount of the feed data is a position of a center of gravity of a minimum rectangle  201  (refer to  FIG. 2 ) that encompasses the pattern  200 . Hereinafter, the position of the center of gravity of the minimum rectangle  201  that encompasses the pattern  200  is referred to as a center point  202  (refer to  FIG. 2 ) of the pattern  200 . The origin (Xi, Yi) (=(0, 0)) of the embroidery coordinate system is a position at which the center point  46  (refer to  FIG. 2 ) of the sewing workpiece  5  matches a needle drop point. In other words, the movement amount of the stitch data or the feed data for which the index is smallest among the plurality of sets of control data indicates a movement amount in each of the X direction and the Y direction when the embroidery frame  53  is moved from a state in which the needle drop point is arranged at the center point  46  of the sewing workpiece  5 . The position that is used as a reference for the movement amount of the stitch data and the movement amount of the feed data from a second movement onward is indicated by a value that is obtained by adding movement amounts of all the stitch data and the feed data up to the respective immediately preceding data, in each of the X direction and the Y direction. The position of the embroidery frame  5  when the needle drop point is arranged at the center point  46  of the sewing workpiece  5  is referred to as an initial position. 
     The CPU  61  acquires the plurality of sets of control data included in the embroidery data from the flash ROM  64  in the index order, and performs processing corresponding to the type of each set of the control data. In this manner, the sewing machine  1  can sew the stitches of the pattern  200  on the sewing workpiece  5 . For example, when the stitch data is acquired, the CPU  61  drives the X axis motor  82  and the Y axis motor  83  based on the movement amount data included in the stitch data, and moves the embroidery frame  53  using the embroidery unit  2 . At the same time, the CPU  61  uses the sewing machine motor  79  to drive the needle bar up-and-down moving mechanism  84 , and causes the needle bar  29  to which the sewing needle  28  has been attached to move up and down. In this manner, the sewing machine  1  sews the stitches on the sewing workpiece  5 . When the feed data is acquired, the CPU  61  drives the X axis motor  82  and the Y axis motor  83  based on the movement amount data included in the feed data, and moves the embroidery frame  53  using the embroidery unit  2 . In the case of the feed data, as described above, the stitches are not sewn on the sewing workpiece  5 . Therefore, the CPU  61  stops the driving of the sewing machine motor  79 . When the suspension data is acquired, the CPU  61  stops the acquisition of the next control data. In this manner, the CPU  61  stops the driving of the sewing machine motor  79 , and also stops the movement of the embroidery frame  53  by the embroidery unit  2 . After that, if necessary, the CPU  61  causes the LCD  15  to display a screen that prompts the user to replace the thread spool  20  with the thread spool  20  around which a specified color of sewing thread is wound. The user may replace the thread spool  20 , if necessary. The user may perform a panel operation to command the restart of the sewing. When the panel operation is detected, the CPU  61  acquires the next control data and restarts the processing. When the end data is acquired, the CPU  61  ends the sewing. 
     When the above-described processing is performed based on the embroidery data, the stitches of the pattern  200  are sewn such that the center point  202  (refer to  FIG. 2 ) of the pattern  200  matches the center point  46  (refer to  FIG. 2 ) of the sewing workpiece  5 . In contrast to this, with the sewing machine  1  of the present embodiment, the user may specify an arbitrary position on the sewing workpiece  5  and a particular position within the pattern  200 . The CPU  61  changes the embroidery data such that the two positions specified by the user match each other, and thus creates data to sew the stitches of the pattern  200  on the sewing workpiece  5 . Hereinafter, the data created by changing the embroidery data is referred to as changed data. A plurality of particular positions within the pattern  200 , which are extracted to allow the user to select one of the plurality of particular positions, are referred to as a plurality of first positions. An arbitrary position on the sewing workpiece  5  that is specified by the user is referred to as a second position. 
     The main processing will be explained with reference to  FIGS. 5 and 6 . When the user performs a panel operation to start the sewing of stitches that represent an embroidery pattern, the main processing is started by the CPU  61  executing the program stored in the ROM  62 . As shown in  FIG. 5 , first, the CPU  61  causes the position of the embroidery frame  53  to be arranged at the initial position (step S 1 ). Specifically, the CPU  61  drives the X axis motor  82  and the Y axis motor  83  and moves the embroidery frame  53  using the embroidery unit  2 . By doing this, the center point  46  (refer to  FIG. 2 ) of the sewing workpiece  5  held by the embroidery frame  53  is arranged at the needle drop point. 
     As described above, the plurality of sets of embroidery data are stored in the flash ROM  64 . The CPU  61  causes the LCD  15  to display a screen on which one of a plurality of embroidery patterns that respectively correspond to the plurality of sets of embroidery data can be selected. The user may perform a panel operation to select a desired one of the embroidery patterns. The CPU  61  detects the panel operation and identifies the selected embroidery pattern (step S 3 ). Hereinafter, a specific explanation will be given using an example in which the pattern  200  (refer to  FIG. 2 ) is identified at step S 3 . Next, the CPU  61  performs processing (extraction processing, refer to  FIG. 6 ) that extracts the plurality of first positions based on the embroidery data that corresponds to the pattern  200  identified at step S 3  (step S 5 ). 
     The extraction processing will be explained with reference to  FIG. 6 . In the extraction processing, variables X, Y, and N that are stored in the RAM  63 , and a table that defines the plurality of first positions are used. First, the CPU  61  initializes the variables X, Y, and N (step S 21 ). Specifically, the CPU  61  sets the variable X to the X coordinate Xi (=0) of the origin, sets the variable Y to the Y coordinate Yi (=0) of the origin, and sets the variable N to 0. Next, the CPU  61  reads and acquires, from the flash ROM  64 , the embroidery data to sew the stitches of the pattern  200  identified at step S 3  (refer to  FIG. 5 ) (step S 23 ). The CPU  61  may acquire the embroidery data using a method other than that described above. For example, the CPU  61  may acquire the embroidery data via the network  9  that is connected to the communication interface  65  (refer to  FIG. 3 ). The CPU  61  may acquire an embroidery pattern via the network  9  that is connected to the communication interface  65 , and may create the embroidery data to sew stitches that represent the acquired embroidery pattern. 
     From among the plurality of sets of control data included in the acquired embroidery data, the CPU  61  selects the control data one set at a time in ascending order of the index (step S 25 ). Based on the type of the selected control data, the CPU  61  determines whether or not the selected control data is the end data (step S 27 ). When it is determined that the selected control data is not the end data (no at step S 27 ), the CPU  61  determines whether or not the selected control data is the suspension data (step S 29 ). When it is determined that the selected control data is the suspension data (yes at step S 29 ), the CPU  61  returns the processing to step S 25 . 
     When the CPU  61  determines that the selected control data is not the suspension data (no at step S 29 ), the selected control data is the stitch data or the feed data. Therefore, the selected control data includes the movement amount data. The CPU  61  adds the movement amount in the X direction of the movement amount data included in the selected control data to the variable X, and adds the movement amount in the Y direction to the variable Y. In this manner, the CPU  61  updates the variables X and Y (step S 31 ). The CPU  61  determines whether or not the selected control data is the stitch data (step S 33 ). When it is determined that the selected control data is not the stitch data (no at step S 33 ), the CPU  61  returns the processing to step S 25 . 
     When it is determined that the selected control data is the stitch data (yes at step S 33 ), the CPU  61  adds 1 to the variable N and updates the variable N (step S 35 ). The CPU  61  determines whether or not the variable N is 100 (step S 37 ). When it is determined that the variable N is not 100 (no at step S 37 ), the CPU  61  returns the processing to step S 25 . When it is determined that the variable N is 100 (yes at step S 37 ), the CPU  61  stores, in the table, the coordinates (X, Y) that are indicated by the variables X and Y, as one of the plurality of first positions, and thus updates the table (step S 39 ). In other words, the coordinates (X, Y) that are stored in the table are each an accumulated value of movement amounts of the stitch data for which the variable N is 1 to 100 and movement amounts of the feed data up to the data immediately preceding the stitch data for which the variable N is 100. Next, the CPU  61  sets the variable N to 0 and thus initializes the variable N (step S 41 ), and returns the processing to step S 25 . When it is determined that the selected control data is the end data (yes at step S 27 ), the CPU  61  ends the extraction processing and returns the processing to the main processing (refer to  FIG. 5 ). When the processing returns to step S 25  from one of the steps S 29 , S 33 , S 37 , and S 41 , the CPU  61  selects the control data of the next index and performs the processing in the same manner as described above. 
     In the above description, the explanation is given using the example in which the extraction processing is performed based on the embroidery data that includes the stitch data and the feed data. In contrast to this, for example, when the extraction processing is performed based on the embroidery data that includes the stitch data and does not include the feed data, the coordinates (X, Y) that are stored in the table at step S 39  are each an accumulated value of the movement amounts of the stitch data for which the variable N is 1 to 100. 
     As shown in  FIG. 5 , after the extraction processing (step S 5 ) is completed, the CPU  61  causes the LCD  15  to display an image that shows the pattern  200  identified at step S 3  (step S 7 ). The image that shows the pattern  200  may be formed based on the embroidery data that corresponds to the pattern  200 . In this case, the CPU  61  may create the image that shows the pattern  200  based on the embroidery data acquired at step S 23  (refer to  FIG. 6 ), and causes the LCD  15  to display the image. The image that shows the pattern  200  may be stored in the flash ROM  64  in advance in association with the embroidery data. In this case, the CPU  61  reads and acquires, from the flash ROM  64 , the image that shows the pattern  200  identified at step S 3 , and causes the LCD  15  to display the image. 
     Using the embroidery coordinate system, the CPU  61  identifies positions of a plurality of pixels that form the image that shows the pattern  200  displayed on the LCD  15 , based on the embroidery data corresponding to the pattern  200 . The CPU  61  identifies the plurality of first positions based on the table stored in the RAM  63 . The CPU  61  superimposes a plurality of feature points  206  (refer to  FIG. 7 ), which are shown by a design that will be described below, on positions corresponding to the plurality of first positions, among the positions of the plurality of pixels that form the image that shows the pattern  200  displayed on the LCD  15 , and causes the LCD  15  to display the feature points  206  (step S 7 ). 
     The image that shows the pattern  200  and the plurality of feature points  206  will be explained with reference to  FIG. 7 . The plurality of feature points  206  are marks that are arranged at the positions corresponding to the plurality of first positions, among the positions of the plurality of pixels that form the image that shows the pattern  200 . Each of the plurality of feature points  206  includes a first line segment  206 A, which extends in the Y direction, and a second line segment  206 B, which extends in the X direction. The first line segment  206 A and the second line segment  206 B are orthogonal to each other. The first line segment  206 A and the second line segment  206 B intersect with each other at a position at which each of the line segments is divided into two equal parts in the length direction. The length of the first line segment  206 A is the same as the length of the second line segment  206 B. The position of the intersection point of the first line segment  206 A and the second line segment  206 B indicates the first position. 
     The design of each of the plurality of feature points  206  is not limited to the above-described example, and may be another design that can be distinguished from the image that shows the pattern  200 . For example, each of the plurality of feature points  206  may include a first line segment that is inclined at 45 degrees with respect to the X direction, and a second line segment that is orthogonal to the first line segment. Further, for example, each of the plurality of feature points  206  may be a design of a circle or a polygon. 
     As shown in  FIG. 5 , the CPU  61  causes the LCD  15  to display the plurality of feature points  206  such that the plurality of feature points  206  are superimposed on the image that shows the pattern  200  (step S 7 ). After that, the CPU  61  determines whether or not a panel operation to select one of the plurality of feature points  206  displayed on the LCD  15  is detected (step S 9 ). When the user selects one of the plurality of feature points  206 , the user may touch a position, on the touch panel  26 , that corresponds to one of the plurality of feature points  206  displayed on the LCD  15 . When it is determined that the panel operation to select one of the plurality of feature points  206  is not detected (no at step S 9 ), the CPU  61  returns the processing to step S 9 . When it is determined that the panel operation to select one of the plurality of feature points  206  is detected (yes at step S 9 ), the CPU  61  identifies coordinates that indicate the first position that corresponds to the selected feature point  206 , based on the table stored in the RAM  63 , and stores the identified coordinates in the RAM  63  (step S 10 ). The CPU  61  advances the processing to step S 11 . 
     The operation to select one of the plurality of feature points  206  displayed on the LCD  15  is not limited to the above-described method. For example, a cursor may be superimposed on one of the plurality of feature points  206  and displayed on the LCD  15 . Further, direction keys to change the position of the cursor and a decision key may be displayed on the LCD  15 . In this case, the user may use the direction keys to move the cursor and to superimpose the cursor on one of the plurality of feature points  206 . Then, the user may select one of the plurality of feature points  206  by touching a position that corresponds to the decision key on the touch panel  26 . 
     When the panel operation to select one of the plurality of feature points  206  is detected, next, the CPU  61  causes the LCD  15  to display direction keys to move the embroidery frame  53  and a decision key. By using the direction keys and the decision key, the user may specify, for the sewing machine  1 , a position on the sewing workpiece  5  at which the stitches of the pattern  200  are to be sewn. Specifically, this is performed as follows. The user may move the embroidery frame  53  by touching a position that corresponds to the direction key on the touch panel  26 . Thus, the user may arrange the position on the sewing workpiece  5  at which the stitches of the pattern  200  are to be sewn, at a position that is vertically below the sewing needle  28  attached to the lower end of the needle bar  29 . By touching the position that corresponds to the decision key on the touch panel  26 , the user may ascertain the position on the sewing workpiece  5  at which the stitches of the pattern  200  are to be sewn. 
     When the panel operation on the direction keys is detected, the CPU  61  drives the X axis motor  82  and the Y axis motor  83  in accordance with the detected panel operation, and moves the embroidery frame  53  using the embroidery unit  2 . The CPU  61  determines whether or not the panel operation on the decision key is detected (step S 11 ). When it is determined that the panel operation on the decision key is not detected (no at step S 11 ), the CPU  61  returns the processing to step S 11 . When it is determined that the panel operation on the decision key is detected (yes at step S 11 ), the CPU  61  identifies the movement amount in the X direction and the movement amount in the Y direction from the initial position of the embroidery frame  53 , based on drive amounts of the X axis motor  82  and the Y axis motor  83  that are driven in accordance with the panel operation on the direction keys. The CPU  61  identifies the identified movement amount in the X direction and the identified movement amount in the Y direction, as the coordinates that indicate the position of the sewing workpiece  5  specified by the user, namely, as the coordinates that indicate the second position, and stores the coordinates in the RAM  63  (step S 12 ). The CPU  61  advances the processing to step S 13 . 
     The operation to specify, for the sewing machine  1 , the position on the sewing workpiece  5  at which the stitches of the pattern  200  are to be sewn is not limited to the above-described method. For example, the user may use a known laser pointer to irradiate a laser beam onto the position on the sewing workpiece  5  at which the stitches of the pattern  200  are to be sewn. In this case, for example, the CPU  61  may perform image processing based on an image of the sewing workpiece  5  captured by a camera (not shown in the drawings), and thus may identify the position of the sewing workpiece  5  onto which the laser beam has been irradiated. The CPU  61  may identify, as the origin, the position vertically below the sewing needle  28  attached to the lower end of the needle bar  29 , in other words, the position of the center point  46  of the sewing workpiece  5  held by the embroidery frame  53  arranged at the initial position. The CPU  61  may identify, as the second position, the position onto which the laser beam is irradiated with respect to the origin. 
     For example, the user may attach a predetermined marker to the position of the sewing workpiece  5  at which the stitches of the pattern  200  are to be sewn. In this case, for example, the CPU  61  may perform image processing based on the image of the sewing workpiece  5  captured by the camera. The CPU  61  may use the image processing to identify the position of the sewing workpiece  5  to which the predetermined marker has been attached. The CPU  61  may identify, as the second position, the position to which the predetermined marker has been attached with respect to the origin. 
     For example, the user may use an ultrasonic pen that can output an ultrasonic wave. Specifically, this is performed as follows. The ultrasonic pen is configured to output an ultrasonic wave when its leading end is pressed. The user may use the leading end of the ultrasonic pen to press the position on the sewing workpiece  5  at which the stitches of the pattern  200  are to be sewn. The ultrasonic pen outputs an ultrasonic wave. Ultrasonic sensors (not shown in the drawings) can detect the ultrasonic wave. The CPU  61  acquires, from each of the ultrasonic sensors, a timing at which the ultrasonic wave is detected. Based on the timing at which the ultrasonic wave is acquired from each of the ultrasonic sensors, the CPU  61  identifies the position on the sewing workpiece  5  pressed by the leading end of the ultrasonic pen. The CPU  61  may identify, as the second position, the position pressed by the leading end of the ultrasonic pen with respect to the origin. 
     Based on the first position identified at step S 10  and the second position identified at step S 12 , the CPU  61  changes the embroidery data that corresponds to the pattern  200  selected at step S 3 , and creates second changed data (step S 13 ). Specifically, this is performed as follows. The embroidery data corresponding to the pattern  200  selected at step S 3  is data to sew the stitches of the pattern  200  such that the center point  202  of the pattern  200  matches the center point  46  of the sewing workpiece  5 . First, the CPU  61  subtracts the X coordinate of the first position from the movement amount in the X direction of the stitch data or the feed data for which the index is smallest among the plurality of sets of control data included in the embroidery data. Further, the CPU  61  subtracts the Y coordinate of the first position from the movement amount in the Y direction of the stitch data or the feed data for which the index is smallest. Thus, the embroidery data is changed to data to sew the stitches of the pattern  200  such that the first position matches the center point  46  of the sewing workpiece  5 . Hereinafter, the data to sew the stitches of the pattern  200  such that the first position matches the center point  46  of the sewing workpiece  5  is referred to as first changed data. 
     Next, the CPU  61  subtracts the X coordinate of the second position from the movement amount in the X direction of the stitch data or the feed data for which the index is smallest among the plurality of sets of control data included in the first changed data. Further, the CPU  61  subtracts the Y coordinate of the second position from the movement amount in the Y direction of the stitch data or the feed data for which the index is smallest. Thus, the first changed data is changed to data to sew the stitches of the pattern  200  such that the first position matches the second position. Hereinafter, the data to sew the stitches of the pattern  200  such that the first position matches the second position is referred to as the second changed data. The CPU  61  stores the created second changed data in the RAM  63 . 
     The CPU  61  acquires the plurality of sets of control data included in the second changed data stored in the RAM  63 , in the index order, and performs processing corresponding to the type of each set of the control data. Thus, the stitches of the pattern  200  are sewn on the sewing workpiece  5  (step S 15 ). When the CPU  61  acquires the end data, all the stitches that represent the embroidery pattern have been sewn. Therefore, the CPU  61  ends the main processing. 
     As explained above, the CPU  61  of the sewing machine  1  extracts the plurality of first positions that are a plurality of positions with respect to the pattern  200 , based on the embroidery data (step S 5 ). From among the plurality of feature points  206 , which are marks arranged at the extracted plurality of first positions, the CPU  61  detects the feature point  206  selected by the user (yes at step S 9 ). The CPU  61  identifies the first position that corresponds to the feature point  206  (step S 10 ). When the panel operation to move the embroidery frame  53  is performed by the user (yes at step S 11 ), the CPU  61  identifies the second position based on the movement amount in the X direction and the movement amount in the Y direction with respect to the initial position of the embroidery frame  53  (step S 12 ). By changing the embroidery data, the CPU  61  creates the second changed data to sew the stitches of the pattern  200  such that the first position matches the second position (step S 13 ). The CPU  61  performs the processing based on the created second changed data, and thus sews the stitches of the pattern  200  on the sewing workpiece  5  (step S 15 ). 
     In this manner, the user may specify, for the sewing machine  1 , one of the plurality of feature points  206  and a desired position on the sewing workpiece  5 . It is thus possible to cause the sewing machine  1  to sew the stitches of the pattern  200  such that the position of the selected feature point  206  matches the desired position on the sewing workpiece  5 . In addition to the desired position (the second position) on the sewing workpiece  5 , the user may specify a particular position (the first position) with respect to the pattern  200 . Thus, the positions of the stitches of the pattern  200  to be sewn on the sewing workpiece  5  can be specified in detail for the sewing machine  1 . The sewing machine  1  can accurately set the positions of the stitches of the pattern  200  to the positions on the sewing workpiece  5  desired by the user, and can sew the stitches. 
     The CPU  61  identifies positions of the stitches to be sewn based on 100n-th stitch data (where n is an integer greater than 1), among the plurality of sets of control data that are arranged in the sewing order. The CPU  61  stores the identified positions in the table as the plurality of first positions (step S 39 ). The CPU  61  superimposes, on the pattern  200 , marks that are respectively arranged at the plurality of first positions stored in the table, and displays the marks on the LCD  15  as the plurality of feature points  206  (step S 7 ). The user may select one of the plurality of feature points  206 . The CPU  61  can set, as the plurality of first positions, the positions of the stitches to be sewn based on a plurality of sets the stitch data that are selected for each predetermined number of stitches in the sewing order, from among all the stitch data. Therefore, the CPU  61  can uniformly disperse and arrange the plurality of first positions with respect to the pattern  200 . 
     The CPU  61  causes the LCD  15  to display the image that shows the pattern  200  and the plurality of feature points  206 , and allows the user to select one of the plurality of feature points  206 . The user may select one of the plurality of feature points  206 , and thus may specify a particular position with respect to the pattern  200  for the sewing machine  1 . Therefore, the CPU  61  can improve convenience when the user specifies the particular position with respect to the pattern  200  for the sewing machine  1 . 
     When the CPU  61  performs the extraction processing (step S 5 ), the CPU  61  extracts the plurality of first positions based on the plurality of sets of control data included in the embroidery data. When the CPU  61  extracts the plurality of first positions, the CPU  61  does not need to use data other than the plurality of sets of control data. Therefore, the CPU  61  can easily extract the plurality of first positions. 
     The CPU  61  can cause the LCD  15  to display the plurality of feature points  206  in a form in which the plurality of feature points  206  can be distinguished from the image that shows the pattern  200  (step S 7 ). Therefore, the user can appropriately recognize the plurality of feature points  206  displayed on the LCD  15  by distinguishing the plurality of feature points  206  from the image that shows the pattern  200 . Thus, the user can appropriately select a desired one of the feature points  206 . The CPU  61  represents each of the plurality of feature points  206  using the first line segment  206 A and the second line segment  206 B, which are arranged orthogonally to each other. The coordinates indicating each of the plurality of first positions that correspond to the plurality of feature points  206  are shown by the intersection point between the first line segment  206 A and the second line segment  206 B. Therefore, the user can accurately recognize the positions of the plurality of feature points  206  displayed on the LCD  15 . 
     Various modifications can be made to the above-described embodiment. The structure of the sewing machine  1  may be changed as appropriate. A multi-needle sewing machine may be used. A sewing machine that is structured integrally with an embroidery unit may be used. Any sewing workpiece may be used as long as a stitch can be sewn thereon. The format of the embroidery data is not limited to that of the above-described embodiment. For example, the stitch data may include an absolute position of a needle drop position in the embroidery coordinate system. For example, the feed data may include an absolute position, in the embroidery coordinate system, of the position to which the embroidery frame  53  is to be moved. The threshold value that is compared with the value of the variable N at step S 37  of the above-described extraction processing (refer to  FIG. 6 ) may be a value other than 100. The CPU  61  may set a value that is input by a panel operation by the user, as the threshold value that is compared with the value of the variable N. 
     When the absolute position of the needle drop position in the embroidery coordinate system is included in the stitch data, the CPU  61  may extract the plurality of first positions based only on the stitch data in the extraction processing. 
     The extraction processing (refer to  FIG. 6 ) and the main processing (refer to  FIG. 5 ) are not limited to the above-described embodiment. Hereinafter, modified examples of the extraction processing (a first modified example to a third modified example) will be explained. Further, a modified example of the main processing (a fourth modified example) will be explained. 
     First Modified Example 
     The first modified example of the extraction processing will be explained with reference to  FIG. 8 . The main processing (refer to  FIG. 5 ) is the same as the above-described embodiment, and an explanation thereof is thus omitted here. The extraction processing in the first modified example is performed at step S 5  of the main processing. In the extraction processing, variables X, Y, Xb, and Yb that are stored in the RAM  63 , and a table are used. 
     First, the CPU  61  initializes the variables X, Y, Xb, and Yb (step S 51 ). Specifically, the CPU  61  sets the variable X to the X coordinate Xi (=0) of the origin, sets the variable Y to the Y coordinate Yi (=0) of the origin, and sets the variables Xb and Yb to 0. Next, the CPU  61  reads and acquires the embroidery data from the flash ROM  64  (step S 53 ). From among the plurality of sets of control data included in the acquired embroidery data, the CPU  61  selects the control data one set at a time in ascending order of the index (step S 55 ). The CPU  61  determines whether or not the selected control data is the end data (step S 57 ). When it is determined that the selected control data is not the end data (no at step S 57 ), the CPU  61  determines whether or not the selected control data is the suspension data (step S 59 ). When it is determined that the selected control data is the suspension data (yes at step S 59 ), the CPU  61  returns the processing to step S 55 . 
     When the CPU  61  determines that the selected control data is not the suspension data (no at step S 59 ), the selected control data is the stitch data or the feed data. Therefore, the selected control data includes the movement amount data. The CPU  61  adds the movement amount in the X direction of the movement amount data included in the selected control data to the variable X, and adds the movement amount in the Y direction to the variable Y. Further, the CPU  61  sets the movement amount in the X direction as the variable Xb, and sets the movement amount in the Y direction as the variable Yb. In this manner, the CPU  61  updates the variables X, Y, Xb, and Yb (step S 61 ). The CPU  61  determines whether or not the selected control data is the stitch data (step S 63 ). When the CPU  61  determines that the selected control data is the stitch data (yes at step S 63 ), the CPU  61  returns the processing to step S 55 . 
     When the CPU  61  determines that the selected control data is not the stitch data (no at step S 63 ), the selected control data is the feed data. The CPU  61  determines whether or not at least one of the variable Xb and the variable Yb is more than 5 cm (step S 65 ). In other words, the CPU  61  determines whether or not the movement amount of the embroidery frame  53  moved based on the feed data is more than 5 cm. When it is determined that at least one of the variable Xb and the variable Yb is larger than 5 cm (yes at step S 65 ), the CPU  61  stores, in the table, the coordinates (X, Y) that are indicated by the variables X and Y, as one of the plurality of first positions, and thus updates the table (step S 67 ). In other words, the coordinates (X, Y) that are stored in the table are each an accumulated value of movement amounts of the plurality of sets of stitch data up to the data immediately preceding the selected feed data, a movement amount of the selected feed data, and movement amounts of the feed data up to the data immediately preceding the selected feed data. Next, the CPU  61  sets each of the variables Xb and Yb to 0 and thus initializes the variables Xb and Yb (step S 69 ). The CPU  61  returns the processing to step S 55 . When it is determined that the variable Xb is equal to or less than 5 cm and the variable Yb is equal to or less than 5 cm (no at step S 65 ), the CPU  61  sets each of the variables Xb and Yb to 0 and thus initializes the variables Xb and Yb (step S 69 ), and returns the processing to step S 55 . When the processing returns to step S 55  from the processing at one of step S 59  and step S 69 , the CPU  61  selects the control data of the next index and performs the processing in the same manner as described above. 
     When it is determined that the selected control data is the end data (yes at step S 57 ), the CPU  61  ends the extraction processing and returns the processing to the main processing (refer to  FIG. 5 ). As described above, in the first modified example, the CPU  61  can extract the positions of the stitches for the stitch data immediately following the feed data included in the embroidery data, as the plurality of first positions. 
     The processing at step S 65  of the above-described extraction processing can be changed. For example, the CPU  61  may add the square of the variable Xb and the square of the variable Yb, and may calculate the square root of the added result. When the calculated square root is more than a predetermined value (5 cm, for example), the CPU  61  may update the table by storing, in the table, the coordinates (X, Y) that are indicated by the variables X and Y, as one of the plurality of first positions. 
     The threshold value that is compared with the values of the variables Xb and Yb in the processing at step S 65  maybe a value other than 5 cm. The CPU  61  may use a length that is input by a panel operation by the user, as the threshold value that is compared with the values of the variables Xb and Yb. 
     In the above-described extraction processing, the CPU  61  extracts the positions of the stitches for the stitch data that immediately follow the feed data, as the plurality of first positions. However, the CPU  61  may extract the positions of the stitches for the stitch data immediately preceding (immediately preceding positions of) the feed data, as the plurality of first positions. 
     When the absolute position of the needle drop position in the embroidery coordinate system is included in the feed data, the CPU  61  may extract the plurality of first positions based only on the feed data in the extraction processing. 
     Second Modified Example 
     The second modified example of the extraction processing will be explained with reference to  FIG. 9 . The main processing (refer to  FIG. 5 ) is the same as the above-described embodiment, and an explanation thereof is thus omitted here. The extraction processing in the second modified example is performed at step S 5  of the main processing. In the extraction processing, variables X and Y that are stored in the RAM  63 , and a table are used. 
     First, the CPU  61  initializes the variables X and Y (step S 81 ). Specifically, the CPU  61  sets the variable X to the X coordinate Xi (=0) of the origin, and sets the variable Y to the Y coordinate Yi (=0) of the origin. Next, the CPU  61  reads and acquires the embroidery data from the flash ROM  64  (step S 83 ). From among the plurality of sets of control data included in the acquired embroidery data, the CPU  61  selects the control data one set at a time in ascending order of the index (step S 85 ). The CPU  61  determines whether or not the selected control data is the end data (step S 87 ). When it is determined that the selected control data is not the end data (no at step S 87 ), the CPU  61  determines whether or not the selected control data is the suspension data (step S 89 ). When it is determined that the selected control data is the suspension data (yes at step S 89 ), the CPU  61  stores, in the table, the coordinates (X, Y) that are indicated by the variables X and Y, as one of the plurality of first positions, and thus updates the table (step S 91 ). The CPU  61  returns the processing to step S 85 . On the other hand, when the selected control data is not the suspension data, the selected control data is the stitch data or the feed data. In this case, the selected control data includes the movement amount data. When it is determined that the selected control data is not the suspension data (no at step S 89 ), the CPU  61  adds the movement amount in the X direction to the variable X and adds the movement amount in the Y direction to the variable Y, based on the movement amount data included in the selected control data. In this manner, the CPU  61  updates the variables X and Y (step S 93 ). The CPU  61  returns the processing to step S 85 . 
     When it is determined that the selected control data is the end data (yes at step S 87 ), the CPU  61  stores, in the table, the coordinates (X, Y) that are indicated by the variables X and Y, as one of the plurality of first positions, and thus updates the table (step S 88 ). The CPU  61  ends the extraction processing and returns the processing to the main processing (refer to  FIG. 5 ). 
     As described above, in the second modified example, the CPU  61  stores, in the table, the coordinates that are respectively indicated by the accumulated value of the movement amounts in the X direction and the accumulated value of the movement amounts in the Y direction, up to the suspension data among the plurality of sets of control data arranged in the sewing order, as one of the plurality of first positions (step S 91 ). The suspension data is data to prompt the user to change the sewing thread used to sew stitches. Therefore, the CPU  61  can extract the plurality of first positions for each of colors of sewing threads that are used to sew the stitches of the pattern  200 . The CPU  61  can set, as the plurality of first positions, end positions when the stitches are sewn using each of the plurality of sewing threads. 
     When it is determined that the selected control data is the end data (yes at step S 87 ), the CPU  61  stores, in the table, the coordinates (X, Y) that are indicated by the variables X and Y, as one of the plurality of first positions, and thus updates the table (step S 88 ). In this manner, the CPU  61  can appropriately store, in the table, the first position that corresponds to the color of the sewing thread that is used when the last stitch is sewn. Therefore, the CPU  61  can appropriately extract the plurality of first positions that correspond to the respective colors of the plurality of sewing threads, without omission. 
     Third Modified Example 
     The third modified example of the extraction processing will be explained with reference to  FIGS. 10 to 12 . In the third modified example, the plurality of first positions are extracted based on embroidery data in a format that is different from the above-described embodiment. The embroidery data will be explained taking an embroidery pattern  210  shown in  FIG. 10  as an example. Hereinafter, the embroidery pattern  210  is simply referred to as the pattern  210 . The left-right direction and the up-down direction of  FIG. 10  respectively correspond to the X direction and the Y direction of the embroidery coordinate system. The pattern  210  is a pattern that represents the capital letter “A” of the alphabet. The pattern  210  is divided into three areas that are shown by blocks  211 ,  212 , and  213 . The shape of each of the blocks  211 ,  212  and  213  is a quadrilateral shape. Each of the blocks  211 ,  212 , and  213  has four vertices. Specifically, the block  211  has four vertices  211 A,  211 B,  211 C, and  211 D. The block  212  has four vertices  212 A,  212 B,  212 C, and  212 D. The block  213  has four vertices  213 A,  213 B,  213 C, and  213 D. 
     An example of the embroidery data to sew stitches that represent the pattern  210  will be explained with reference to  FIG. 11 . Hereinafter, the stitches that represent the pattern  210  are simply referred to as the stitches of the pattern  210 . The embroidery data includes various types of data, such as block data, suspension data, and end data. In the block data, an index is associated with four sets of vertex data. The index indicates a sewing order. Each of the four sets of vertex data indicates a position of each of the four vertices of the block in the embroidery coordinate system. The position that is used as a reference for each of the four sets of vertex data is a center point  215  (refer to  FIG. 10 ) of a minimum rectangle  214  that encompasses the pattern  210 . The suspension data and the end data are the same data as the data included in the embroidery data of the pattern  200 . A plurality of sets of the block data, a plurality of sets of the suspension data, and the end data are arranged in the sewing order when the stitches of the pattern  210  are sewn, namely, in an index order. Hereinafter, the plurality of sets of block data, the plurality of sets of suspension data, and the end data are collectively referred to as control data, similarly to the above-described embodiment. 
     The CPU  61  acquires the plurality of sets of control data included in the embroidery data from the flash ROM  64  in the index order, and performs processing corresponding to the type of each set of the control data. In this manner, the sewing machine  1  sews the stitches of the pattern  210  on the sewing workpiece  5 . For example, when the block data is acquired, the CPU  61  identifies the shape of the quadrilateral-shaped block, based on the coordinate data of the four vertices included in the block data. The CPU  61  drives the X axis motor  82  and the Y axis motor  83 , and moves the embroidery frame  53  using the embroidery unit  2 . At the same time, the CPU  61  uses the sewing machine motor  79  to drive the needle bar up-and-down moving mechanism  84 , and causes the needle bar  29  to which the sewing needle  28  is attached to move up and down. Thus, the sewing machine  1  performs sewing on the sewing workpiece  5  clamped in the embroidery frame  53 , such that the inside of the block is filled with stitches. The processing that performs sewing such that the inside of the block is filled with stitches is a known technique, and a detailed explanation thereof is therefore omitted here. 
     When the above-described processing is performed based on the embroidery data, the stitches of the pattern  210  are sewn such that the center point  215  (refer to  FIG. 10 ) of the pattern  210  matches the center point  46  (refer to  FIG. 3 ) of the sewing workpiece  5 . In contrast to this, in the sewing machine  1  of the third modified example, the first position and the second position can be specified using the same method as in the above-described embodiment. The CPU  61  extracts a plurality of candidate positions within the minimum rectangle  214  that is specified by the user, as the plurality of first positions, by the extraction processing (refer to  FIG. 12 , to be described below). 
     The extraction processing in the third modified example will be explained with reference to  FIG. 12 . The main processing (refer to  FIG. 5 ) is the same as the above-described embodiment, and an explanation thereof is thus omitted here. The extraction processing in the third modified example is performed at step S 5  of the main processing. 
     First, the CPU  61  reads and acquires the embroidery data from the flash ROM  64  (step S 71 ). From among the plurality of sets of control data included in the acquired embroidery data, the CPU  61  selects the control data one set at a time in ascending order of the index (step S 73 ). The CPU  61  determines whether or not the selected control data is the end data (step S 75 ). When it is determined that the selected control data is not the end data (no at step S 75 ), the CPU  61  determines whether or not the selected control data is the suspension data (step S 77 ). When it is determined that the selected control data is the suspension data (yes at step S 77 ), the CPU  61  returns the processing to step S 73 . When the selected control data is not the suspension data, the selected control data is the block data. Therefore, the selected control data includes the four sets of vertex data. When it is determined that the selected control data is not the suspension data (no at step S 77 ), the CPU  61  stores, in the table, the coordinates that are indicated by each of the four sets of vertex data included in the block data, as the plurality of first positions, and thus updates the table (step S 79 ). The CPU  61  returns the processing to step S 73 . When it is determined that the selected control data is the end data (yes at step S 75 ), the CPU  61  ends the extraction processing and returns the processing to the main processing (refer to  FIG. 5 ). 
     As described above, in the third modified example, the CPU  61  stores, in the table, the coordinates that are indicated by the four sets of vertex data included in the block data, as the plurality of first positions (step S 79 ). In this case, the CPU  61  can extract four of the first positions, for each of the blocks  211 ,  212 , and  213  that form the pattern  210 . 
     The CPU  61  may select at least one of the four sets of vertex data. Then, the CPU  61  may store, in the table, the coordinates that are indicated by the selected vertex data, as one of the plurality of first positions. 
     Fourth Modified Example 
     The modified example of the main processing will be explained with reference to  FIG. 13 . In the fourth modified example of the main processing, the same processing as the main processing shown in  FIG. 5  is denoted with the same reference numeral and an explanation thereof is simplified. First, the CPU  61  causes the embroidery frame  53  to be arranged at the initial position (step S 1 ). Next, the CPU  61  causes the LCD  15  to display a screen on which one of a plurality of embroidery patterns can be selected. The user may perform a panel operation to select a desired one of the embroidery patterns. The CPU  61  detects the panel operation and identifies the selected embroidery pattern (step S 3 ). Hereinafter, a specific explanation will be given using an example in which the pattern  200  (refer to  FIG. 2 ) is identified at step S 3 . Next, the CPU  61  performs the extraction processing (refer to  FIGS. 6 ,  8 ,  9 , and  12 ) (step S 5 ). The CPU  61  causes the LCD  15  to display an image that shows the pattern  200 . Further, the CPU  61  causes the LCD  15  to display the plurality of feature points  206  (refer to  FIG. 7 ) such that the plurality of feature points  206  are superimposed on the displayed pattern  200  (step S 7 ). 
     The CPU  61  determines whether or not a panel operation that is performed for the first time to select one of the plurality of feature points  206  displayed on the LCD  15  has been detected (step S 101 ). When the CPU  61  determines that the panel operation to select one of the plurality of feature points  206  is not detected (no at step S 101 ), the CPU  61  returns the processing to step S 101 . When the CPU  61  determines that the panel operation that is performed for the first time to select one of the plurality of feature points  206  is detected (yes at step S 101 ), the CPU  61  identifies the coordinates indicating the first position that corresponds to the selected feature point  206 , and stores the coordinates in the RAM  63  (step S 102 ). The CPU  61  determines whether or not the panel operation that is performed for the second time to select one of the plurality of feature points  206  displayed on the LCD  15  is detected (step S 103 ). When the CPU  61  determines that the panel operation to select one of the plurality of feature points  206  is not detected (no at step S 103 ), the CPU  61  returns the processing to step S 103 . When the CPU  61  determines that the panel operation that is performed for the second time to select one of the plurality of feature points  206  is detected (yes at step S 103 ), the CPU  61  identifies the coordinates indicating the first position that corresponds to the selected feature point  206 , and stores the coordinates in the RAM  63  (step S 104 ). 
     The CPU  61  causes the LCD  15  to display the direction keys and the decision key that are used to move the embroidery frame  53 . The user may move the embroidery frame  53  by touching a position that corresponds to the direction key on the touch panel  26 . Thus, the user may arrange the position on the sewing workpiece  5  at which the stitches of the pattern  200  are to be sewn, at a position that is vertically below the sewing needle  28  attached to the lower end of the needle bar  29 . By touching the position that corresponds to the decision key on the touch panel  26 , the user may ascertain the position on the sewing workpiece  5  at which the stitches of the pattern  200  are to be sewn. 
     When the panel operation on the direction keys is detected, the CPU  61  drives the X axis motor  82  and the Y axis motor  83  in accordance with the detected panel operation, and moves the embroidery frame  53  using the embroidery unit  2 . The CPU  61  determines whether or not a panel operation that is performed for the first time on the decision key has been detected via the touch panel  26  (step S 105 ). When it is determined that the panel operation on the decision key is not detected (no at step S 105 ), the CPU  61  returns the processing to step S 105 . When it is determined that the panel operation that is performed for the first time on the decision key is detected (yes at step S 105 ), the CPU  61  identifies the movement amount in the X direction and the movement amount in the Y direction from the initial position of the embroidery frame  53 , based on drive amounts of the X axis motor  82  and the Y axis motor  83  that are driven in accordance with the panel operation on the direction key. The CPU  61  identifies the identified movement amount in the X direction and the identified movement amount in the Y direction, as the coordinates that indicate the second position, and stores the coordinates in the RAM  63  (step S 106 ). 
     When the CPU  61  detects a panel operation on the direction key after it is determined that the panel operation that is performed for the first time on the decision key is detected, the CPU  61  drives the X axis motor  82  and the Y axis motor  83  in accordance with the panel operation, and continues to move the embroidery frame  53  using the embroidery unit  2 . The CPU  61  determines whether or not a panel operation that is performed for the second time on the decision key is detected (step S 107 ). When it is determined that the panel operation on the decision key is not detected (no at step S 107 ), the CPU  61  returns the processing to step S 107 . When the CPU  61  determines that the panel operation that is performed for the second time on the decision key is detected (yes at step S 107 ), the CPU  61  identifies the movement amount in the X direction and the movement amount in the Y direction from the initial position of the embroidery frame  53 , based on drive amounts of the X axis motor  82  and the Y axis motor  83  that are driven in accordance with the panel operation on the direction key. The CPU  61  identifies the identified movement amount in the X direction and the identified movement amount in the Y direction, as the coordinates that indicate the second position, and stores the coordinates in the RAM  63  (step S 108 ). Hereinafter, the first position that is identified for the first time is referred to as a first starting position. The first position that is identified for the second time is referred to as a first ending position. The second position that is identified for the first time is referred to as a second starting position. The second position that is identified for the second time is referred to as a second ending position. 
     The CPU  61  changes the embroidery data that corresponds to the pattern  200  identified at step S 3 , based on the first starting position, the first ending position, the second starting position, and the second ending position that are stored in the RAM  63 , and creates sixth changed data, which will be described below (step S 13 ). The CPU  61  stores the created sixth changed data in the RAM  63 . 
     Specifically, this is performed as follows. First, the CPU  61  divides the length of a line segment that connects the second starting position and the second ending position by the length of a line segment that connects the first starting position and the first ending position. Thus, the CPU  61  calculates a ratio of the length of the line segment that connects the second starting position and the second ending position with respect to the length of the line segment that connects the first starting position and the first ending position. Next, the CPU  61  calculates an angle when the direction from the first starting position toward the first ending position is rotated to be aligned with the direction from the second starting position toward the second ending position. 
     Next, the CPU  61  changes the embroidery data to sew the stitches of the pattern  200  to data to sew stitches that represent a pattern obtained by enlarging or contracting the pattern  200  at the calculated ratio. Hereinafter, the pattern  200  that has been enlarged or contracted by the calculated ratio is referred to as a first changed pattern. The data to sew the first changed pattern is referred to as third changed data. Next, the CPU  61  changes the third changed data to data to sew stitches that represent a pattern obtained by rotating the first changed pattern by the calculated angle. Note that the center at the time of rotation is a center point of the first changed pattern. Hereinafter, the first changed pattern that has been rotated by the calculated angle is referred to as a second changed pattern. The data to sew the second changed pattern is referred to as fourth changed data. The fourth changed data is data to sew the second changed pattern such that the center point of the second changed pattern matches the center point  46  of the sewing workpiece  5 . 
     Next, the CPU  61  subtracts the X coordinate of the first starting position from the movement amount in the X direction of the stitch data or the feed data for which the index is smallest among the plurality of sets of control data included in the fourth changed data. Further, the CPU  61  subtracts the Y coordinate of the first starting position from the movement amount in the Y direction of the stitch data or the feed data for which the index is smallest among the plurality of sets of control data included in the fourth changed data. Thus, the fourth changed data is changed to data to sew the second changed pattern such that the first starting position matches the center point  46  of the sewing workpiece  5 . Hereinafter, the data to sew the second changed pattern such that the first starting position matches the center point  46  of the sewing workpiece  5  is referred to as fifth changed data. 
     Next, the CPU  61  subtracts the X coordinate of the second starting position from the movement amount in the X direction of the stitch data or the feed data for which the index is smallest among the plurality of sets of control data included in the fifth changed data. Further, the CPU  61  subtracts the Y coordinate of the second starting position from the movement amount in the Y direction of the stitch data or the feed data for which the index is smallest among the plurality of sets of control data included in the fifth changed data. Thus, the fifth changed data is changed to data to sew stitches that represent the second changed pattern such that the first starting position matches the second starting position. Hereinafter, the data to sew the stitches that represent the second changed pattern such that the first starting position matches the second starting position is referred to as the sixth changed data. The CPU  61  stores the created sixth changed data in the RAM  63 . 
     The second changed pattern is a pattern obtained by enlarging or contracting the pattern  200  at the ratio of the length of the line segment that connects the second starting position and the second ending position with respect to the length of the line segment that connects the first starting position and the first ending position. Further, the second changed pattern is a pattern obtained by rotating the pattern  200  by the angle when the direction from the first starting position toward the first ending position is rotated to be aligned with the direction from the second starting position toward the second ending position. Therefore, when the stitches that represent the second changed pattern are sewn such that the first starting position matches the second starting position, the first ending position corresponding to the changed second changed pattern matches the second ending position. As described above, in order to match the first starting position with the second starting position and to match the first ending position with the second ending position, at step S 13 , the CPU  61  changes the length between the first starting position and the first ending position that correspond to the pattern  200 , and the direction from the first starting position toward the first ending position, and thus creates the sixth changed data. 
     The CPU  61  acquires the plurality of sets of control data included in the sixth changed data stored in the RAM  63 , in the index order, and performs processing corresponding to the type of each set of the control data. Thus, the stitches representing the second changed pattern are sewn on the sewing workpiece  5  (step S 15 ). When the CPU  61  acquires the end data, the stitches representing the embroidery pattern have all been sewn. Therefore, the CPU  61  ends the main processing. 
     As explained above, the CPU  61  identifies, as the first starting position and the first ending position, the positions of the two feature points selected by the user from among the plurality of feature points  206  (step S 102 , step S 104 ). The CPU  61  identifies, as the second starting position and the second ending position, different two points on the sewing workpiece  5  selected by the user (step S 106 , step S 108 ). In order to match the first starting position with the second starting position and to match the first ending position with the second ending position, the CPU  61  changes the length between the first starting position and the first ending position, and the direction from the first starting position toward the first ending position. The CPU  61  creates the sixth changed data by changing the embroidery data to sew the stitches of the pattern  200  in this manner (step S 13 ). When the CPU  61  performs processing based on the sixth changed data, the stitches that represent the pattern obtained by enlarging or contracting and rotating the pattern  200  are sewn on the sewing workpiece  5 . Therefore, the user can cause the sewing machine  1  to sew the stitches of the pattern  200  that has been enlarged or contracted and rotated, at desired positions of the sewing workpiece  5 . Further, the user can easily perform an operation that causes the sewing machine  1  to sew the stitches of the pattern  200  that has been enlarged or contracted and rotated. 
     In the above-described embodiment, when the first starting position, the first ending position, the second starting position, and the second ending position are acquired, the CPU  61  may create, based on the embroidery data, changed data to sew the stitches of the pattern  200  that has not been enlarged or contracted and has not been rotated. When the first starting position, the first ending position, the second starting position, and the second ending position are acquired, the CPU  61  may create, based on the embroidery data, changed data to sew the stitches of the pattern  200  that has been rotated but has not been enlarged or contracted. 
     The method for extracting the plurality of first positions may be set on the sewing machine  1  by a panel operation by the user. The CPU  61  may detect the panel operation and identify the method for extracting the plurality of first positions. The CPU  61  may perform one of the above-described extraction processings ( FIGS. 6 ,  8 ,  9 , and  12 ) based on the identified method. 
     Although a detailed explanation is omitted, the embroidery data may include data that indicates a sewing start position, which is a position at which the sewing is started. In this case, the plurality of first positions can include the sewing start position. 
     The apparatus and methods described above with reference to the various embodiments are merely examples. It goes without saying that they are not confined to the depicted embodiments. While various features have been described in conjunction with the examples outlined above, various alternatives, modifications, variations, and/or improvements of those features and/or examples may be possible. Accordingly, the examples, as set forth above, are intended to be illustrative. Various changes may be made without departing from the broad spirit and scope of the underlying principles.