JP2007215594A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a sewing quality in a sewing machine driving a needle in a direction crossing the feed direction of a sewn object. <P>SOLUTION: This sewing machine is provided with a stitch forming mechanism, a feed mechanism 30 of the work, a needle drive mechanism 70 driving the needle orthogonally crossing the feed, a storage means 98 storing pattern data of orthogonal stitchs, a starting means starting the sewing, a stop command means stopping the sewing, a stop control means stopping it at a needle location immediately after forming a feed stitch or a needle reciprocating drive according to a stop signal, an output means 95 outputting the completion of a rotating operation of the sewn object, and a control means 90, when generating a start signal after outputting the rotation signal, controlling to form the feed stitch of the needle drive length and the reciprocating needle drive stitch of the feed length. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sewing machine in which a needle swing is performed in a direction crossing a feed direction of a sewing product.

A feed mechanism that feeds the fabric that is to be sewn, and a needle swing mechanism that swings the needle along a direction orthogonal to the feed direction of the fabric, and in cooperation therewith, a feed stitch having a predetermined feed length; 2. Description of the Related Art Conventionally, a sewing machine that forms a T-stitch seam (also referred to as an L-stitch seam), which is an orthogonal seam formed by repeating a reciprocating needle-fitting seam with a predetermined needle swing length formed orthogonal to a feed seam, on a fabric is known. (For example, refer to Patent Document 1).
This T-stitch seam is used when sewing a square label on a fabric.
For example, as shown in FIG. 11 (A), the T stitch sewing means that the needle is moved from the first needle drop position (T1) to the needle drop position (T2) of the second stitch by forward feed movement and orthogonal to this needle movement direction. From moving the needle to the needle drop position of the third stitch (T3) by moving the needle to the right or left and moving the needle to the first needle drop position of the next stitch to the left or right As shown in FIG. 11B, the three stitches formed as a unit are stitches continuously performed in the cloth feeding direction.
When the label L is sewn, T-stitch stitching is performed along each side of the quadrangular label L as shown in FIG. In that case, the needle movement is stopped for each corner of the label L during the sewing, and the feed direction is changed by rotating the label L and the fabric 90 degrees around the sewing needle.
JP-A-2005-87336

An example of T-stitch sewing with the conventional sewing machine will be described in detail with reference to FIGS. 12A and 12B, for example. FIGS. 12A and 12B show a case where sewing starts from the needle drop position P of the corner S of the label L and the needle drops are sequentially performed from P1 to P9 before and after the corner Z. In this case, when a change in the direction of cloth feed of 90 ° is performed in P7 after the completion of the needle swing from P6 to the first needle drop position P7 of the next T-stitch seam at the corner Z, the feed pitch (from P4 to P5) 12) and the needle swing width (the needle swing amount between P2 and P3) have the same value, as shown in FIG. The needle drop position P6 due to the needle swing immediately before the change in the feed direction coincides with the needle drop position 8 due to the forward feed immediately after the change in the cloth feed direction, and the needle according to the previous needle swing immediately before the change in the cloth feed direction. The drop position P3 coincides with the needle drop position P9 due to the swinging of the needle immediately after the cloth feed direction is changed, and there is no problem in the finish of the sewing.
However, in the conventional sewing machine, when the feed pitch and the needle swing width do not match, as shown in FIG. 12B, the needle drop position (P6 and P8) and the needle drop position (P3 and P9) There is a problem that the stitches do not overlap with each other, the stitches are interlaced, and needles are dropped on the thread passed between the stitches, so that the quality of the stitches is impaired.
12A and 12B show the case where the cloth feeding direction is changed at P7, the same problem occurs when the cloth feeding direction is changed at P5.
Further, conventionally, when the hand movement is stopped at the needle swing position (P3, P6) where the cloth should not be rotated, the cloth cannot be rotated, and therefore the needle drop position (P5, P7, etc.) where the cloth can be further rotated. ), The troublesome work of changing the cloth feeding direction after the needle has been moved and stopped is also required.
An object of the present invention is to provide a sewing machine capable of improving the sewing quality with a simple operation.

According to the first aspect of the present invention, the stitch forming mechanism driven by the drive motor, the feed mechanism capable of changing the feed amount by electrical control, and swinging the needle along the direction orthogonal to the feed direction by the feed mechanism are performed. At the same time, a needle swinging mechanism whose electric swing amount can be changed by electrical control, a feed stitch having a predetermined feed length formed by driving the stitch forming mechanism and the feed mechanism, and driving of the stitch forming mechanism and the needle swing mechanism. Storage means for storing pattern data for forming orthogonal stitches formed by repetition of reciprocating needle swing stitches of a predetermined needle swing length formed orthogonal to the feed stitches by
In each sewing machine, there is provided a start operation means for generating a start signal by an operation, and an operation control means for controlling each mechanism on the basis of pattern data to form an orthogonal seam on a workpiece by generating the start signal. Stop command means for outputting a stop signal for stopping the mechanism, and each mechanism at the time of needle drop immediately after forming a feed stitch having a predetermined feed length or immediately after forming a reciprocating needle swing stitch having a predetermined needle swing length based on the stop signal Stop control means for stopping the operation, and output means for outputting a rotation operation signal indicating that the sewing product has been rotated by operation while each mechanism is stopped by the stop signal. When the activation signal is generated after the signal is output, the predetermined feed is made so that an orthogonal seam composed of a feed stitch having a predetermined needle swing length and a reciprocating needle swing stitch having a predetermined feed length is formed. It adopts a configuration that controls each mechanism is To interchanging the predetermined needle swing length.

  The invention according to claim 2 has the same configuration as that of the invention according to claim 1, and the operation control means stops each mechanism immediately after the formation of the feed stitch having a predetermined feed length based on the stop signal, When a start signal is generated after the rotation operation signal is output, each mechanism is controlled so that the orthogonal stitch is started from the formation of a feed stitch having a predetermined stitch swing length.

  The invention described in claim 3 has the same configuration as that of the invention described in claim 1 or 2, and further includes a feed length change input means for changing the feed length of the feed seam during the formation of the orthogonal seam. The means controls the feed mechanism so that the feed stitch of the feed length changed by the feed length change input means is obtained, and a stop signal is output during the formation of the feed stitch with the changed feed length. When each mechanism stops and a rotation operation signal and a start signal are generated after that, the reciprocating needle swing seam formed after the start signal is generated becomes a needle swing seam with a changed feed length. The configuration is such that the mechanism is controlled.

  The invention according to claim 4 has the same configuration as that of the invention according to claim 1, and sets the number of feed stitches in units of a predetermined feed stitch for each sewing process divided by the rotation operation of the sewing product. The stop control means outputs a stop signal each time the number of feed stitches formed by the needle movement after the start signal is generated reaches the set number of feed stitches, and the start operation means Adopts a configuration in which a rotation operation signal is output together with a start signal.

In the invention according to claim 1, for example, when a label or the like that is a square or rectangular sewing product is sewn to another sewing product, the needle is moved along one side of the outer shape of the label, and the corner of the label The needle movement is temporarily stopped at the part, the workpiece is manually rotated, for example, 90 degrees, the feeding direction is changed to the sewing product so as to align the direction of movement with the next side, and the needle movement is resumed. The process is repeated for each side of the label outline.
In addition, the needle movement at that time is labeled by orthogonal seams formed by repetition of a feed stitch having a predetermined feed length formed by a needle drop toward another sewing product side and a needle stitch having a predetermined needle swing length. The direction of the hand movement is adjusted along the side of the outer shape of.

Then, when the operator operates the stop command means at the corner of the label, the needle drop occurs immediately after forming the feed stitch having the predetermined feed length or immediately after forming the reciprocating needle swing stitch having the predetermined needle swing length. The sewing machine is stopped. Next, when a rotation operation signal indicating that the workpiece is rotated by the operator's operation and the cloth feeding direction is changed in order to move the needle along the next side from each side, the changed needle movement is output. Operation of each of the above mechanisms by switching the predetermined feed length and the predetermined needle swing length so that an orthogonal seam composed of a feed stitch having a predetermined needle swing length and a reciprocating needle swing stitch having a predetermined feed length is formed. By performing the control, even if the feed length (feed pitch) of the feed stitch and the needle swing length (needle swing amount) of the needle swing stitch are set differently, the needle entry position before and after changing the cloth feed direction Can be matched, and a beautiful seam can be formed. Further, since the needle drop positions coincide before and after the cloth feed direction is changed, the problem of needle drop on the thread passed between the seams can be solved. In addition, when changing the fabric feed direction, the sewing machine automatically stops when the needle drops outside the label, and when rotating the fabric, the sewing machine stops so that the needle does not fall on the label side and the sewing machine stops. It is possible to eliminate the troublesome work of making it happen.
Therefore, according to the first aspect of the present invention, it is possible to solve the problems such as the occurrence of crossing of the needles and the needle drop on the thread passed between the stitches with a simple operation, and to improve the sewing quality. It is possible to provide a sewing machine that can handle this.

  According to the second aspect of the present invention, each mechanism is stopped immediately after the formation of the feed stitch having a predetermined length based on the stop signal, and when the activation signal is generated after the rotation operation signal is output, By controlling each mechanism so that it starts from the formation of the feed stitch of the length and omitting the needle movement by the needle swing immediately after the change of the cloth feed direction, the needle movement by the cloth feed and the cloth feed direction before and after the change of the cloth feed direction are omitted. It is possible to avoid the formation of overlapping seams due to the movement of the needle along the reciprocating needle swinging along. That is, in FIGS. 12 (A) and 12 (B), immediately after the change of the cloth feed direction at the corner portion Z, there are three reciprocating needle swing seams between P2 and P3 and three cloth feed seams between P1 ″ and P2 ″. Overlapping seams are formed by the sewing thread, but by performing the above control, formation of the reciprocating needle-stitching seam between P2 and P3 is prevented, and it is possible to avoid overlapping the thread at the same location, More beautiful seams can be formed.

In the invention according to claim 3, for example, when a label or the like which is a square or rectangular sewing product is sewn to another sewing product, the length of one side of the outer shape is a predetermined feeding length by the feeding mechanism. When the value is not close to an integral multiple of the feed length change input means, for example, the feed amount per stitch is changed, and the feed length of the orthogonal stitch is changed.
And even if the feed length is changed and adjusted based on the input value by the feed length change input means during sewing, and it is reflected in the formation of the feed stitch just before the change of the cloth feed direction. The reciprocating needle swing stitches after the change in the cloth feeding direction can be formed with the changed and adjusted feeding length.
Accordingly, the needle drop position before and after the change in the cloth feed direction can be matched while performing proper needle movement by adjusting the feed amount, so that it is possible to further improve the sewing quality.

  In the invention according to claim 4, for example, when a label or the like, which is a square or rectangular sewing product, is sewn to another sewing product, the sewing is divided by the rotation operation of the sewing product by the feed stitch number setting means. The number of feed stitches for changing the cloth feed direction is set and stored for each process, that is, the sewing process divided at each corner of the label. The stop control means generates a stop signal each time the number of feed stitches by needle movement after the start signal is generated reaches the set number of feed stitches, stops each mechanism, and the start operation means sends the start signal At the same time, a rotation operation signal is output. Therefore, if the operator sets the number of stitches to sew each side of the label according to the label to be sewn once, each mechanism will automatically stop each time the set number of feed stitches is sewn. At the same time, the label can be sewn easily by operating the operation means for outputting the rotation operation signal one by one only by operating the activation operation means after changing the cloth feeding direction.

(Whole structure of the sewing machine)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing an overall configuration of a sewing machine 1 according to the present embodiment.
As shown in FIG. 1, the sewing machine 1 is placed on a sewing machine table T and has a bed portion 2a (broken line) provided with a needle plate on the upper surface thereof, and substantially parallel to the bed portion 2a above the bed portion 2a. As an extending arm portion 2b, a body portion standing on one end side of the bed portion 2a and supporting the base end portion of the arm portion 2b, and a drive motor that rotationally drives an upper shaft as a sewing machine main shaft (not shown) A sewing machine motor 12 (see FIG. 7), a hook mechanism (not shown) driven by the sewing machine motor 12 as well as the needle driving mechanism 60 having the needle bar 61 and the sewing needle 11 driven up and down by the sewing machine motor 12 via the upper shaft. A stitch forming mechanism, a feed mechanism 30 for feeding the fabric C, which is a workpiece to be sewn placed on the bed portion 2a, and a feed direction of the fabric C (in the X-axis direction) in synchronization with the vertical movement of the sewing needle 11. Direction (Y) The needle swinging mechanism 70 that swings the needle in the direction), the cloth presser 14 that presses the cloth from above the feed dog 31 of the feed mechanism 30, and the cloth feed amount (feed length per needle) acting on the feed mechanism 30. A feed amount changing means 40 capable of adjusting the length), a feed length changing input means 50 for manually inputting the cloth feed amount changed by the feed amount changing means 40 during the formation of the T stitch stitch, and a stitch forming mechanism. And a control device 90 as operation control means for integrally controlling the overall operation of the sewing machine 1 so as to form a T-stitch seam by controlling the feed mechanism and the needle swing mechanism. This sewing machine 1 uses the sewing machine motor 12 as a drive source, and feeds the fabric C in a predetermined direction by the feed mechanism 30 while moving the sewing needle 11 up and down by the needle drive mechanism, thereby giving a stitch to the fabric C.
A needle plate 13 that is horizontal when the sewing machine 1 is installed on a horizontal plane is disposed above the bed portion 2a. The needle plate 13 is parallel to the upper surface of the needle plate 13 and the arm portion 2b of the sewing machine 1 and the bed. The direction along the longitudinal direction of the portion 2a is the Y-axis direction, the direction parallel to the upper surface of the needle plate 13 and perpendicular to the Y-axis direction is the X-axis direction, and the vertical vertical direction is the Z-axis direction. Assumed to be performed.

(Feeding mechanism)
First, the mechanical configuration of the feed mechanism 30 will be described with reference to FIGS. 2 and 3. 2 is a cross-sectional view of the II-II portion of FIG. 1 as viewed from below the bed portion 2a, and FIG. 3 is a cross-sectional view of the III-III portion of FIG.
As shown in FIG. 2, a lower shaft 17 is rotatably supported in the bed portion 2a in a state along the Y-axis direction. The lower shaft 17 is connected to the sewing machine motor 12 via a transmission mechanism such as a link mechanism or a belt mechanism (not shown), and interlocks with an upper shaft (not shown) that applies a vertical movement driving force to the needle bar 61. And rotate at the same rotation speed. The feed mechanism 30 is applied with a driving force for feeding the cloth from the lower shaft 17.

  The feed mechanism 30 includes a feed dog 31 that transports the cloth C on the upper surface of the needle plate 13 along the X-axis direction, a holding body 36 that holds the feed dog 31 and moves forward along the X-axis direction, A vertically moving link body 32 that connects the lower shaft 17 and the holding body 36 via an eccentric cam 32a fixed to one end portion (downward in FIG. 2) of the shaft 17, and one end thereof to the lower shaft 17 via an eccentric cam 33a. The left and right moving link body 33 connected to each other, the feed amount adjusting link body 34 having the other end portion of the left and right moving link body 33 connected to the intermediate portion thereof, one end portion of the feed amount adjusting link body 34 and the feed dog 31 And a transmission support shaft 35 for connecting the two.

  One end of the vertically moving link body 32 is rotatably connected to the holding body 36, and the other end performs a circumferential motion according to the amount of eccentricity by the eccentric cam 32a. Of the circumferential motion of the vertically moving link body 32, the reciprocating driving force in the vertical direction is transmitted to the holding body 36 and the feed dog 31. That is, the feed dog 31 always moves up and down with a displacement equal to the eccentric amount of the eccentric cam 32a when the lower shaft 17 is driven to rotate.

  One end of the left / right link body 33 is rotatably connected to the feed amount adjusting link body 34, and the other end thereof performs a circumferential motion according to the amount of eccentricity by the eccentric cam 33a. Of the circumferential movement of the left and right link body 33, the reciprocating driving force in the vertical direction is transmitted to the feed amount adjustment link body 34.

  The feed amount adjusting link body 34 is given a reciprocating driving force in the vertical direction from the left and right moving link body 33 at its longitudinal intermediate portion, and one end portion of which is provided at one end portion of the transmission support shaft 35, which will be described later. The tip of each of the two is pivotably connected. Accordingly, the feed amount adjusting link body 34 swings in the vertical direction at the other end portion with the one end portion serving as a swing fulcrum. A square piece 41 of a feed amount changing means 40 to be described later is connected to the other end portion of the feed amount adjusting link body 34.

  The square piece 41 is supported in such a manner that the reciprocating direction of the square piece 41 can be adjusted by inclining on both sides in the X-axis direction with reference to a state parallel to the Z-axis direction. When the square piece 41 is supported so as to be able to move in parallel with the Z-axis direction, the feed amount adjustment link body 34 is not displaced in the X-axis direction. On the other hand, when the reciprocating direction of the square piece 41 is inclined in the X-axis direction, the feed amount adjusting link body 34 is displaced in the X-axis direction. Further, the phase of the swing operation in the X-axis direction of the feed amount adjusting link body 34 is reversed depending on whether the tilt is made to one or the other in the X-axis direction from the state parallel to the Z-axis direction.

The transmission support shaft 35 includes a shaft portion 35a disposed along the Y-axis direction, and arm portions 35b and 35c provided at one end and the other end of the shaft portion 35a, respectively. Then, the shaft portion 35a serves as a central axis, and the tip portions of both the arm portions 35b and 35c are swung in conjunction with each other.
The distal end portion of one arm portion 35 b is connected to one end portion of the feed amount adjusting link body 34, and the distal end portion of the other arm portion 35 c is connected to the holding body 36 of the feed dog 31. Therefore, as described above, when the feed amount adjusting link body 34 swings along the X-axis direction in accordance with the adjustment of the reciprocating direction of the square piece 41, the holding body 36 and the feed dog 31 are moved. The swing driving force in the X-axis direction is applied in the opposite phase. The feed dog 31 performs a reciprocating motion along the X-axis direction with a phase corresponding to the reciprocating direction of the square piece 41 via the feed amount adjusting link body 34 and the transmission support shaft 35.

  With the above configuration, the feed mechanism 30 uses the rotational driving force of the lower shaft 17 to provide the feed dog 31 with a combination of reciprocating motions in the X-axis direction and the Z-axis direction to perform an elliptical motion. At this time, the feed dog 31 is disposed below the needle plate 13, and the tip of the feed dog 31 is provided on the needle plate 13 when moving a part of the locus drawn by the elliptical motion. The cloth C protrudes from the through hole to the upper surface, and the fabric C can be fed in the forward direction (left direction in FIG. 3) and in the reverse direction (right direction in FIG. 3) according to the phase of the movement in the X-axis direction. Further, according to the reciprocating direction of the square piece 41, the feed amount can be adjusted and the feed amount can be set to zero.

(Feeding amount changing means)
The feed amount changing means 40 will be described in detail based on FIG. 2, FIG. 3 and FIG. FIG. 4 is a configuration diagram showing a peripheral configuration of a later-described feed amount adjusting motor 43 which is a drive source of the feed amount changing means 40.
The feed amount change means 40 supports the square piece 41 connected to the other end of the feed amount adjustment link body 34 described above, supports the square piece 41 so as to be able to reciprocate, and sets the reciprocation direction to the XZ plane. A stepping motor serving as a change driving means serving as a driving source for variably adjusting the reciprocating direction of the square piece 41 by the square piece support 42 and the square piece support 42 that can be variably adjusted in any direction along the direction. The feed amount adjusting motor 43, the main link body 44 that is swung by the output shaft of the feed amount adjusting motor 43, the driven link body 45 fixedly supported by the square piece support 42, the main link body 44, and the driven link body. The transmission link body 46 which connects 45 is provided.

The square piece support 42 is formed in a columnar shape and is supported by a sewing machine frame (not shown) so as to be rotatable with respect to the center line thereof. And the guide groove 42a which supports the square piece 41 is formed along the cylindrical diameter direction. That is, the square piece support 42 can variably adjust the reciprocating direction of the square piece 41 by being subjected to a rotation operation.
The follower link body 45 is fixedly installed along the diameter direction of the square piece support 42 at one end in the center line direction of the square piece support 42.

  On the other hand, one end of the main link body 44 is fixedly supported on the output shaft in a state along the rotational drive radial direction of the feed amount adjusting motor 43, and the other end is a driven link body via the transmission link body 46. 45 is connected to one end of 45. As a result, the rotational driving force of the feed amount adjusting motor 43 rotates the square piece support body 42 via the driven link body 45. That is, the square piece 41 defines the feed amount of the feed dog 31 according to the drive amount (rotation angle change amount) of the feed amount adjustment motor 43.

(Feed length change input means)
FIG. 5 is a plan view of the feed length change input means 50. As shown in FIG. 5 (A), the feed length change input means 50 is disposed inside the body of the sewing machine, and a feed lever 51 to which manual rotation operation is applied, and the same support as the feed lever 51. A transmission arm 53 connected by a shaft 52, a potentiometer 54 for detecting an operation amount by the feed lever 51, a base end portion is fixedly supported on a detection shaft of the potentiometer 54, and a rotation end portion is a rotation of the transmission arm 53. A detection arm 55 connected to the end portion, a tension spring 56 that applies a rotational force to the feed lever 51 in a certain rotational direction, and stoppers 57 and 58 that regulate the rotation operation range of the feed lever 51 are provided. .

The feed lever 51 can be rotated around a tear shaft 52 and is normally biased toward the stopper 57 by a tension spring 56. The feed lever 51 has a rotating end protruding outward from the body of the sewing machine, and a user of the sewing machine manually operates the protruding rotating end. That is, the feed lever 51 is operated in the direction from the stopper 57 to 58.
The operation range of the feed lever 51 is restricted between the two stoppers 57 and 58, and the feed lever 51 is biased by a tension spring 56 in a direction in which the feed lever 51 comes into contact with one of the stoppers 57. That is, the feed lever 51 is normally kept in contact with one stopper 57, and only when necessary to adjust the needle swing width, the feed lever 51 resists the tension spring 56 by the necessary adjustment amount on the other stopper 58 side. The operation is to be performed. When the hand is released from the feed lever 51, the tension spring 56 returns to the original position. Therefore, the adjustment is reflected only when the feed lever 51 is operated.

When a turning operation is applied to the feed lever 51, the transmission arm 53 is turned in conjunction with the feed lever 51 as shown in FIG. 5B, and the detection shaft of the potentiometer 54 is further connected via the detection arm 55. Is rotated. The potentiometer 54 is connected to the control device 90, and the potentiometer 54 outputs a detection signal corresponding to the amount of rotation of the feed lever 51 to the control device 90. The control device 90 stores a table indicating the correspondence between the detection signal of the potentiometer 54 and the rotation angle amount of the feed amount adjusting motor 43 of the feed amount changing means 40, and rotates the feed amount adjusting motor 43 according to the detection signal. Control the operation to drive.
That is, according to the operation amount of the feed lever 51, the feed amount of the fabric C by the feed mechanism 30 is changed and adjusted in real time.
Normally, the feed amount adjusting motor 43 is controlled so as to have any one of the shaft angles according to the set value and the sewing data during sewing. When the feed lever 51 is operated in this state, the operation control means 90 performs operation control so as to increase / decrease the current shaft angle of the feed amount adjusting motor 43 according to the operation amount of the feed lever 51.
As described above, the feed mechanism 30 is configured such that the feed amount is electrically controlled by the control device 90.

(Needle drive mechanism)
The needle drive mechanism 60 will be described with reference to FIG. The needle drive mechanism 60 includes a needle bar 61 that holds the sewing needle 11 at the lower end, an upper shaft 62 that is rotationally driven by the sewing machine motor 12, a rotary weight 63 that is fixedly provided at the tip of the upper shaft, and a rotary weight. A crank rod 65 that connects the eccentric position of 63 and a needle bar holder 64 fixed to the needle bar 61.
With the above configuration, when the upper shaft 62 is rotationally driven by the sewing machine motor 12, the rotary weight 63 also rotates. Since one end of the crank rod 65 is connected to the eccentric position of the rotary weight 63, the circular rod orbits and moves, but the other end is connected to the needle bar 61 via the needle bar holder 64. Therefore, only the vertical movement component of the circular motion is transmitted to the needle bar 61.

(Needle swing mechanism)
The needle swing mechanism 70 will be described with reference to FIG. The needle swing mechanism 70 includes a needle bar support 71 that supports the needle bar 61 so as to be movable up and down, a support bar 72 that supports the needle bar support 71 so as to be movable along the Y-axis direction, and a drive of the needle swing operation. A needle swing motor 73 that is a source stepping motor, an output arm 74 provided on an output shaft of the needle swing motor 63, and a link body 75 that connects the output arm 74 and the support rod 72 are provided.

A guide (not shown) is provided in the arm portion 2 b so that the needle bar support 71 does not swing around the support bar 72.
The support rod 72 is supported by a metal so as to be movable along the Y-axis direction in the arm portion 2b.
The needle swing motor 73 is disposed in the arm portion 2b with its output shaft directed in the X-axis direction, and the output arm 74 is connected to the output shaft in a state of facing downward. Therefore, when the needle swing motor 73 is driven, the tip of the output arm 74 moves substantially along the Y-axis direction, and the support bar 72 is moved in the Y-axis direction via the link body 75. Accordingly, it is possible to move the needle bar 61 in parallel along the Y-axis direction via the needle bar support frame 71 by driving the needle swinging motor 73 and to swing the sewing needle 11 along the Y-axis direction. It has become.
The needle swing motor 73 is connected to the control device 90, and the amount of needle swing is controlled by controlling the shaft angle. Therefore, the needle swing amount of the needle swing mechanism 70 is electrically controlled by the control device 90.

  A needle bar holder 69 fixed to the needle bar 61 is connected to the crank rod 65 via a connecting pin 64a extending along the Y-axis direction, and the connecting pin 64a is connected to the crank rod. Since it is slidably inserted in the Y-axis direction with respect to 65, even if the needle bar 61 moves in the Y-axis direction by swinging the needle, the connecting pin 64a is slid but connected to the crank rod 65. The sewing needle 11 can be moved up and down while maintaining the state and swinging the needle.

(Sewing machine control system)
Next, the control system of the sewing machine 1 will be described with reference to FIG. FIG. 7 is a block diagram showing a control system of the sewing machine 1.
The control device 90 stores a ROM 92 in which a processing program or processing data for executing processing to be described later of the sewing machine 1 is written, a CPU 91 for executing the processing according to the processing program, and various processing data of the CPU 91. The RAM 93 and an electrically writable and erasable nonvolatile memory element EEPROM 98 are provided. The RAM 93 is provided with various work memories, counters, etc., and is also used as a work area in processing. The EEPROM 98 is a storage means for storing pattern data for forming a T-stitch seam described later. Function.

  The control device 90 is connected to the sewing machine motor 12, the upper shaft phase (rotation angle) detecting means 18 via the input interface (not shown), the feed amount adjusting motor 43 for performing the feed amount setting operation of the feed mechanism 30, and the manual input. A potentiometer 54 for detecting a change amount with respect to a set value of the feed amount by the needle, a needle swing motor 73, a start operation means for generating a start signal for starting the sewing machine by a front stepping operation, and a stop signal for stopping the sewing machine by a neutral operation are output. An operation pedal 16 functioning as a stop command means, an operation panel 94 for inputting various settings and displaying various information, and various mechanisms (stitch forming mechanism, feed mechanism 30 and needle swing mechanism 70) being stopped by the above stop signals. A rotation operation signal (described later) indicating that the sewing product has been rotated by operation is output to the control device 90. Fabric turn switch 95 as the output means is connected.

The operation pedal 16 can be stepped forward and backward from the neutral position. When the front pedal is stepped, a speed command signal corresponding to the amount of stepping is output together with the start signal, and the CPU 91 of the control device 90 outputs the speed command. The sewing machine motor 12 is rotationally driven at a rotational speed corresponding to the signal. Further, the stop signal described above is output by an operation to the neutral position while the sewing machine motor 12 is activated, and the CPU 91 stops the sewing machine motor 12 based on the stop signal. The sewing machine motor 12 is connected to the control device 90 via its power supply output circuit, and the rotational speed is controlled by controlling the drive current value.
Further, when the operation pedal is stepped on, a thread trimming command from a thread trimming means (not shown) is output to the control device 90, and the control device 90 executes a thread trimming operation.

The operation panel 94 has a touch panel on the surface thereof, and inputs for setting a sewing amount (feed pitch) and a needle swing amount (needle swing width) for each stitch are performed. Further, as necessary, the sewing state, various setting information, and operation instructions for the sewing machine user are displayed.
Here, normally, in this sewing machine 1, sewing is performed based on the needle swing amount and feed amount set by the operation panel 94, and the CPU 91 drives the feed amount adjusting motor 43 at the start of sewing or during sewing. Operation control is performed by rotating the square piece support 42 by a predetermined angle to set the feed amount to the set feed amount.

  Further, the CPU 91 performs an operation control to display on the operation panel 94 a setting change screen for inputting setting information for specifying the stitches formed on the workpiece according to the processing program stored in the ROM 92. The setting information is stored in the EEPROM 98 as pattern data based on the input, and operation control for driving the sewing machine motor 12 and the feed amount adjusting motor 43 is performed based on the stored pattern data.

The CPU 91 drives the needle swing motor 73 at a predetermined angle timing with respect to the needle drop timing recognized from the output of the encoder 18 and moves the needle with the needle swing width corresponding to the setting.
Similarly, the CPU 91 drives the feed amount adjusting motor 43 at a predetermined angle timing with respect to the needle drop timing recognized from the output of the encoder 18, and feeds the fabric C with the feed amount according to the setting.

The sewing machine 1 can perform various needle movements by cooperating the feeding operation and the needle swinging operation. Among various types of sewing that can be performed by the sewing machine 1, there is a sewing method called T-stitch sewing (also referred to as L-stitch sewing), as described above with reference to FIG. This T-stitch sewing is suitable for performing label sewing by performing along each side of the quadrangular label L as shown in FIG.
The sewing machine 1 has a function suitable for sewing a rectangular object by T-stitch sewing as described above, which will be described in detail below.
Note that the term “fabric C”, which is a material to be sewn, used in the text means that both the label L, which is a sewing object, and the fabric D, to which the label L is sewn, are included. For example, the description of sending the fabric C means that the label L and the fabric D to be sewn are sent together.

The EEPROM 98 includes a feed seam having a predetermined feed length (X portion in FIG. 8) formed by the stitch formation mechanism and driving of the feed mechanism 30, and a seam formation mechanism and a needle swing mechanism 70 following the feed seam. To form a T-stitch seam, which is an orthogonal seam formed by repetition of a reciprocating needle swing seam (Y portion in FIG. 8) having a predetermined needle swing length formed orthogonal to the feed seam of the predetermined length. Pattern data is stored.
The predetermined feed length and the predetermined needle swing length are both set by a combination of the number of stitches and the stitch length of one stitch. In the case of the feed length, the sewing length corresponds to the feed pitch. In the case of the needle swing length, the sewing length corresponds to the needle swing width. Therefore, both the feed length and the needle swing length can be set without limiting the number of stitches to one stitch. For example, two stitches having a sewing length (feed pitch) of 3 mm as the feed length, and the sewing length as the needle swing length. It is possible to set 2 needles with a width (needle swinging width) of 5 mm. That is, in this case, one orthogonal seam is constituted by reciprocating needles with two one-way needles in 5 mm increments in the needle swinging direction after two stitches are moved in increments of 3 mm in the feed direction. 8A and 8B show a case where both the predetermined feed length and the predetermined needle swing length are set to one stitch. The predetermined feed length and the predetermined needle swing length can be set by the operation panel 94.

The CPU 91 controls each mechanism so as to move the needle along each side of the outer shape when sewing the square label L (sewing object). When the operator operates the operation pedal 16 to the neutral position at each corner of the label L to generate a stop signal, the CPU 91 determines a predetermined feed length (for example, a sewing length) based on the output of the stop signal. A stitch forming mechanism and a feed mechanism 30 at the time of needle drop immediately after formation of a feed stitch of 3 mm (one stitch) or immediately after formation of a reciprocating needle swing stitch of a predetermined stitch swing length (for example, one stitch of 4 mm stitch length). And each mechanism of the needle swing mechanism 75 is automatically stopped.
Further, when the fabric turn switch 95 indicating that the 90 ° fabric C is rotated about the sewing needle 11 is operated and the rotation operation signal is output while each mechanism is stopped by the stop signal, the operation pedal 16 is thereafter output. When a start signal is generated and a start signal is generated, the reciprocation of a feed stitch having a predetermined stitch swing length (for example, one stitch with a sewing length of 4 mm) and a predetermined feed length (for example, one stitch with a sewing length of 3 mm) is performed. The predetermined feed length and the predetermined needle swing length are exchanged to control each of the mechanisms so that a needle is moved along the next side so that a T-stitch seam composed of a needle swing seam is formed. Is called.

Further, the CPU 91 stops each of the mechanisms immediately after forming the feed stitch having the predetermined feed length based on the stop signal according to a predetermined control program. In order to sew the label L to the fabric D with the stitches as shown in FIG. 8, a needle drop position on the label side (third needle drop positions C9 and C11 in FIGS. 8A and 8B described later) is used. This is because it is inconvenient to rotate the fabric C around the center), so that the operator needs to sew only one stitch to drop the needle outside the label L.
This control is also for preventing the formation of overlapping needle stitches along the cloth feeding direction after the rotation before the cloth C is rotated.
That is, when each mechanism is stopped at the time of needle drop immediately after formation of a reciprocating needle swing stitch having a predetermined needle swing length based on the generation of the stop signal, the subsequent rotation operation of the fabric C is performed when each mechanism stops. Later, a needle swing seam S1 (shown by a broken line in FIG. 8A) is formed at a position where a feed seam is to be formed later, and this also impairs the aesthetic appearance of the seam. This control is performed so as not to perform the double stitching by the needle swing seam formed before the rotation operation of the fabric C.

Further, the CPU 91 sets the T stitch stitch so as to start from the formation of the feed stitch having the predetermined stitch swing length when the activation signal is generated after the rotation operation signal is output in accordance with a predetermined control program. Overlapping sewing avoidance control for controlling each mechanism is executed. This is because, after the fabric C is rotated by 90 °, simply changing the predetermined feed length and the predetermined needle swing length does not change the repetition order of the feed stitch and the needle swing stitch. This is to avoid the formation of overlapping seams.
That is, when each mechanism is stopped immediately after formation of a feed stitch having a predetermined feed length based on the generation of the stop signal, the fabric C is rotated, and then the sewing machine is started, the next stitch of the T stitch stitch is Since this is a needle swing seam, a reciprocating needle swing seam S2 (shown by a broken line in FIG. 8 (A)) is formed on the feed seam immediately before the rotation operation of the fabric C, and the appearance is impaired. In this control, the overlap stitching by the needle stitches after the rotation operation of the fabric C is not performed.

Further, when a change in the output of the potentiometer 54 is detected by an input from the feed lever 51 of the feed length change input means 50 during sewing in accordance with a predetermined control program, the CPU 91 causes the feed amount adjusting motor 43 to Operation control is performed to perform rotational driving for the adjustment angle corresponding to the detection output of the potentiometer 54 from the current shaft angle.
As a result, the stitch pitch is changed during the formation of the T-stitch seam, and as a result, the feed length of the feed stitch of the T-stitch seam is changed (for example, one stitch with a stitch length of 3 mm is changed to one stitch with a stitch length of 2 mm). )

  When a stop signal is output by the neutral operation of the operation pedal 16 during the formation of the feed stitch with the feed length changed by the feed length change input means 50, the CPU 91 stops each mechanism, and then the fabric turn When the rotation operation signal and the activation signal are generated by the front depression operation of the switch 95 and the operation pedal 16, the reciprocating needle swing stitch formed after the activation signal is generated is changed (for example, the sewing length). The needle swinging mechanism is controlled so as to form a needle swing stitch of 2 mm in length).

The above control will be specifically described with reference to FIG. In this case, a three-needle T-stitch seam composed of a feed stitch having a stitch length of 3 mm and a reciprocating needle swing stitch having a stitch length of 4 stitches. The case where formation is started from the needle drop position A1 is taken as an example.
In FIG. 8A, An indicates the needle drop position of the first stitch of the above-mentioned three stitch unit T stitch, Bn indicates the needle drop position of the second stitch, and Cn indicates the needle drop position of the third stitch. The attached numerical value n indicates the number of repetitions of T stitches in units of three stitches from the start of sewing (n = 1, 2, 3,...). Symbol X is the feed length of the feed stitch set between the first stitch and the second stitch (one stitch with a stitch length of 3 mm), and Y is set between the second stitch and the third stitch. The needle swing length (1 stitch with a sewing length of 4 mm) is shown here. Since both the feed stitch and the needle swing stitch are one stitch, the feed length X is the feed pitch and the needle swing length. Y is the needle swing width of one stitch.
When the fabric C is rotated 90 ° at the corner Z of the label L, each mechanism of the sewing machine is stopped at B10 immediately after the formation of the feed seam between A10 and B10. Next, when an activation signal is generated after the rotation of the fabric C, formation of the seam is started from the feed seam having the needle swing length Y, and the needle is dropped to B11. As a result, when the feed direction is changed, the cloth feed (B10 → B11) immediately after the feed direction is changed with the needle swing width Y immediately before the feed direction change (B9 → C9). Note that the third stitch (C10) immediately before the feed direction is changed and the first stitch (A11) just after the change are omitted in order to avoid overlap of the stitches.
Furthermore, the needle swing (B11 → C11) immediately after the change of the feed direction is performed with the feed amount X immediately before the change of the feed direction (A10 → B10).
As a result, when the feed amount from the first stitch to the second stitch and the needle swing width from the second stitch to the third stitch are not the same value (X ≠ Y), before and after the corner of the label L, The needle drop positions (for example, C9 and C11) before and after the change of the feed direction can be matched.

The control when the feed amount adjustment by the feed length change input means 50 described above is performed immediately before the change of the feed direction will be described with reference to FIG. In FIG. 8B, Xa indicates the feed amount adjusted by the feed length change input means 50.
Also in this case, after the change of the feed direction, the cloth feed (B10 → B11) immediately after the change of the feed direction is performed with the needle swing width Y immediately before the change of the feed direction (B9 → C9). Also in this case, the third stitch (C10) immediately before the feed direction is changed and the first stitch (A11) just after the change are omitted in order to avoid overlap of the stitches.
On the other hand, the needle swing (B11 → C11) immediately after the change of the feed direction is performed with the feed amount Xa immediately before the change of the feed direction (A10 → B10).
As a result, the result of the feed amount adjustment is reflected and sewing after the change in the feed direction is performed, so that the needle drop positions (C9 and C11) before and after the change in the feed direction can be matched.

Further, when the number of feed stitches for changing the cloth feed direction is set for each sewing process using the operation panel 94 as the feed stitch number setting means as a break, the CPU 91 sets this needle. The number is stored in the EEPROM 98 and each mechanism is automatically stopped every time the number of stitches set for each side of the label is formed, and the feed length and the needle swing length are switched by depressing the next operation pedal. Control each mechanism. Therefore, if the operator sets the number of feed stitches to sew each side of the label according to the label to be sewn once, each mechanism is automatically activated each time the set number of feed stitches is finished. In addition to being stopped, it is only necessary to rotate the sewing object by 90 ° and operate the starting operation means, so there is no need to operate the operation pedal 16 to stop the sewing needle 11 at each corner of the label, Since it is not necessary to operate the operation means for outputting the rotation operation signal one by one, the label can be sewn more easily.
The feed length is set by a combination of the number of stitches and the stitch length of one stitch as described above, and the feed stitch is a stitch formed with the set feed length of the predetermined length. Therefore, the number of feed stitches is a number set in units of feed stitches set by the number of stitches and the stitch length of one stitch (also referred to as feed pitch). For example, the feed stitch length is configured. If the number of stitches is 1, the number of feed stitches is equal to the number of stitches formed by cloth feeding.

(Normal sewing operation of the sewing machine)
Based on FIG. 9, the operation of label sewing of the sewing machine 1 will be described. FIG. 9 shows that the operator starts and stops each mechanism at a desired needle drop position by operating the pedal 94, and is labeled by a T stitch stitch having a predetermined feed length and a predetermined needle swing length input from the operation panel 94. It is the flowchart shown about operation | movement of the control apparatus 90 in performing the sewing of this.

First, the sewing lengths X and Y set by the operation panel 94 and stored in the EEPROM 98 are read by the CPU 91 and stored in the RAM 93 (step S1).
Next, the CPU 91 sets the sewing length X as the feed length X1 as an initial setting, and sets the sewing length Y as the needle swing length Y1 (step S2).
Further, the CPU 91 determines whether or not the operation pedal 16 is stepped forward according to the control program (step S3).

  When the operation pedal 16 is not stepped forward, the CPU 91 waits until the operation pedal 16 is stepped forward. When the CPU 91 determines that the operation pedal 16 has been stepped forward, the CPU 91 drives the sewing machine motor 12 and the feed adjustment motor 43 to The feed mechanism 30 is operated to start sewing from the needle drop (A1 in FIGS. 8A and 8B) of the first stitch of the first feed stitch in T-stitch stitching (step S4).

Next, the CPU 91 detects the output of the potentiometer 54 and determines whether or not there is an input operation of the feed lever 51 of the feed length change input means 50 (step S5).
As a result, if there is no input operation of the feed lever 51, the process proceeds to step S7.

  When there is an input operation of the feed lever 51 in step S5, the CPU 91 proceeds to step S6 and calculates the corrected feed amount Xa by reducing the input adjustment amount with respect to the initial feed amount set value X. Then, a process of substituting for the feed length X1 is executed (step S6).

Next, in step S7, the CPU 91 determines whether or not the operation pedal 16 is neutrally operated and a stop signal is output.
When the CPU 91 determines that the pedal neutral operation is not performed, the CPU 91 proceeds to step S5 and repeats the processing from step S5 to step 7 until the operation pedal 16 is operated backward or neutrally. And a T-stitch seam composed of a feed stitch having a feed length X1 driven by the stitch formation mechanism and the feed mechanism 30 and a needle swing length Y1 reciprocating needle swing stitch by the stitch formation mechanism and the needle swing mechanism 70 is formed. (For example, A1 to B9). That is, after forming the feed seam from A1 to B1, the CPU 91 forms the forward needle swing seam from B1 to C1 and the return needle swing seam from C1 to A2, and thereafter repeats this to form the T stitch seam. Form.

  On the other hand, if it is determined in step S7 that the stop signal has been output by the neutral operation of the operation pedal 16, the process proceeds to step S8 to output a deceleration command to the sewing machine motor 12 and immediately after completion of the formation of the feed stitch when the deceleration is continued. It is determined whether or not it is possible to stop at the needle drop (Bn needle drop position in FIGS. 8A and 8B). This determination is made based on the stop time stored in advance in the ROM 92 corresponding to the rotational speed of the sewing machine motor 12 at the timing when the stop signal is output.

If the CPU 91 determines in step S8 that it cannot stop at the time of needle drop immediately after the formation of the feed stitch, the CPU 91 proceeds to step S7 while outputting the deceleration command and determines whether the neutral operation of the operation pedal 16 is continued. Then, if it is determined that the operation is continued, the process proceeds to step 8 again to determine whether or not it is possible to stop when the needle drop occurs immediately after the formation of the feed stitch. If the processes of step S7 and step S8 are repeated, the thin motor 12 gradually approaches a speed at which it can be stopped immediately after the formation of the feed stitch, and an affirmative determination is made in step S8, and the CPU 91 causes the sewing motor 12 to feed the feed stitch. Stop when the needle drops just after the formation is completed (step S9).
These processes in steps S7 to S9 are performed in order to prevent the sewing machine from being stopped at the time of the needle drop on the label side as described above, and overlapping needles along the cloth feed direction after the rotation before the cloth C is rotated. This is a process for preventing the formation of a swing stitch.

  Next, in step S10, the CPU 91 determines whether or not the operation pedal 16 has been stepped backward. If it is determined that the operation pedal 16 has been stepped backward, the CPU 91 proceeds to step S11 and performs thread trimming by operation control for driving the drive source of the thread trimming means. Execute and finish the sewing work.

  On the other hand, when the CPU 91 determines in step S10 that the operation pedal 16 has not been stepped on, the CPU 91 proceeds to step S12 and determines whether or not the fabric turn switch 95 is operated and the rotation operation signal of the fabric C is output. If the fabric turn switch 95 is not operated, the process proceeds to step S10 again. When the CPU 91 determines that the rotation operation signal has been output, the CPU 91 proceeds to step S13. The fabric turn switch 95 means that the worker has changed the feeding direction by 90 ° at the corner of the label L.

  Further, in step S13, the CPU 91 forms the next process, that is, the sewing of the next side of the label, with a T stitch stitch composed of a feed stitch having a needle swing length and a reciprocating needle swing stitch having a feed length. The sewing length value (Y1) that was previously set for the needle swing length Y1 is substituted for the feed length X1, and the sewing length that was previously set for the feed length X1 for the needle swing length Y1 The length value (X1) is substituted, and the feed length and the predetermined needle swing length are exchanged.

Next, the CPU 91 proceeds to step S14, and determines whether or not the operation pedal 16 is stepped forward. Then, the CPU 91 waits for the operation pedal 16 to be depressed when there is no front depression operation of the operation pedal 16, and when it is determined that the operation pedal 16 has been subjected to the front depression operation and an activation signal is generated, the T-stitch stitch is the needle up to that point. The stitch formation position of the second stitch of the feed seam is controlled by controlling the stitch formation mechanism and the feed mechanism 30 so as to start from the formation of the feed stitch of the swing length (the length of Y1, B9 to C9) (FIG. 8A). (B) B11) is moved to drop the needle (step S15). Subsequently, the stitch formation mechanism and the needle swing mechanism 70 are formed so that a reciprocating needle swing seam (the seam between B11 and C11) at the feed length (the length from X1, B9 to B10) is formed. To control. Thereafter, the process proceeds to step S5, in which the sewing machine motor 12 is driven to rotate at a rotational speed corresponding to the depression amount of the operation pedal 16, and the feed amount adjusting motor 43 and the stitch length are changed based on the replaced feed length and needle swing length. Operation control for operating the feed mechanism 30 and the needle swing mechanism 70 is executed via the needle swing motor 73 to form a T stitch stitch.
With the above control, in steps S5 and S6 described above, when there is an input operation of the feed lever 51 of the feed lever 51 of the feed length change input means 50 and the feed amount is changed, the changed feed length is Each mechanism is controlled so that a reciprocating feed stitch reflected after the start signal is generated and formed after the start signal is generated is a needle swing stitch having a changed feed length.
As described above, the CPU 91 starts from the formation of the T-stitch seam and feed seam, as described above, so as not to perform the double stitching by the needle stitches after the rotation operation of the fabric C. .

Further, in the processing during the hand movement in Steps S3 to 8 and Steps S14 to S8, the CPU 91 counts the current number of hands based on the output of the encoder 18, for example, in the formation of a T stitch seam in units of three stitches. It is determined whether the number of stitches is any of the first to third stitches in T-stitch sewing. The counter is reset when the count value is incremented by 1 and counted for three stitches, and then starts counting from 1 again. Then, when the current number of stitches is read from the counter, if the current number of stitches is the first stitch (An), the feed amount adjusting motor 43 is driven so that the cloth feed of the set predetermined feed length is performed, If it is the second stitch (Bn), the needle swinging motor 73 is driven so that the swing of the set predetermined swing length is performed, and if it is the third stitch (Cn), the predetermined predetermined swing length is reversed. Control for driving the needle swing motor 73 is performed so that the direction of the needle swing is performed.
In the case of T stitch stitches in units of three stitches, the feed stitch formed by the cloth feed mechanism is one stitch, so the predetermined feed length set corresponds to the cloth feed pitch and is formed by the needle swing mechanism. Since the needle swing seam is one stitch for both reciprocations, the predetermined feed length corresponds to the needle swing width.

  In step S8, it can be determined whether or not it is possible to stop after the formation of the feed stitch, but this determination is made when the CPU 91 recognizes the current number of stitches in the T stitch stitch by the encoder 18. When the sewing machine motor 12 starts decelerating from the determined position, it is determined whether or not the second stitch (Bn) is possible.

  By repeating the above processes, T-stitch sewing is performed on the four sides of the label L, and sewing is completed.

(Sewing operation with the set number of stitches)
Next, in addition to the feed length and needle swing length at the T-stitch seam as pattern data, the number of feed stitches corresponding to each sewing process divided by the rotation operation of the sewing product, that is, for each sewing process of each side of the label The processing in the case where is stored in advance will be described with reference to FIG. It is assumed that the number of feed stitches on each side is set in advance by an operation panel 94 as a feed stitch number setting means.

First, in accordance with the control program, the CPU 91 reads the sewing lengths X and Y set in the operation panel 94 and stored in the EEPROM 98 and the feed stitch number M1 on the first side in the label sewing, and counts as the sewing progresses. The count value N of the feed stitch number counter is initialized to zero and the number of corners (number of corners) r of the label is initialized to 1, respectively. (Step S20).
The number of corners r is a count value that is counted up at the corner Z of the label L every time sewing of the number of feed stitches M1 to M4 set for each side of the label is completed, and the number of feed stitches M1 to M1 on each side. It corresponds to the numbers 1 to 4 attached to M4.

Next, in accordance with the control program, the CPU 91 sets the sewing length X as the feed length X1 as an initial setting, and sets the sewing length Y as the needle swing length Y1 (step S21).
Further, the CPU 91 determines whether or not the operation pedal 16 has been stepped forward according to the control program (step S22).
When the operation pedal 16 is not stepped forward, the CPU 91 waits until the operation pedal 16 is stepped forward. When the CPU 91 determines that the operation pedal 16 has been stepped forward, the CPU 91 drives the sewing machine motor 12 and the feed adjustment motor 43 to The feed mechanism 30 is operated to start sewing from the first needle drop (A1 in FIGS. 8A and 8B) of the first feed stitch in T-stitch sewing (step S23).

  Next, the CPU 91 counts up the count value N of the feed stitch number counter at the time of needle drop of the stitch formation with the number of feed stitches accompanying the needle operation (step S24), and is set as the count value N of the number of feed stitches. It is determined whether or not the number of feed stitches M1 coincides (step S25).

If the count value N and the set feed stitch number M1 do not match, the CPU 91 returns to step S24 and repeats the processing of step S24 and step S25 until the count value N and the feed stitch number M1 match. Form stitch seams.
The CPU 91 proceeds to step S when the count value N, which is the number of stitches formed by the stitching after the start signal is generated when the operating pedal is depressed forward, and reaches the set stitch number Mr (M1). If the coincidence is determined in S25, the CPU 91 operates as a stop control means, outputs a stop signal to the sewing machine motor 12, and automatically stops the sewing machine motor 12 at the time of the needle drop immediately after the formation of the feed stitch (step S26). ). This stop process is automatically executed even if the operation pedal 16 is depressed. In this case, the CPU 91 sets the rotation speed of the sewing machine motor 12 according to the difference between the set feed stitch number M1 and the count value N so that each mechanism can be stopped as soon as the count value N matches the set feed stitch number M1. It is desirable to perform control that gradually decelerates.

  Next, the CPU 91 counts up the number of corners r and completes the feed stitch counter while assuming that the sewing for the set number of stitches for one side of the label is completed and the sewing needle 11 has reached the first corner of the label. The count value N is initialized to zero (step S27). Next, it is determined whether or not the counted number r of corners has exceeded 4, that is, whether or not the sewing has been completed up to the fourth corner (step S28).

  If it is determined that the sewing has not been completed, the CPU 91 next determines the number of stitches Mr (r is the number of stitches set for the next side of the label, that is, the next step of label sewing, so that the first corner When r = 2 is reached, the number of stitches M2) is read (step S29).

  Next, the CPU 91 forms a feed length X1 in order to form the next process, that is, the sewing of the next side of the label, with a T stitch stitch composed of a feed stitch having a needle swing length and a reciprocating needle swing stitch having a feed length. The sewing length value (Y1) previously set for the needle swing length Y1 is substituted for the stitch length Y1 and the sewing length value previously set for the feed length X1 is substituted for the needle swing length Y1. Substituting (X1), the feed length and the predetermined needle swing length are exchanged (step S30).

Next, the CPU 91 determines whether or not the operation pedal 16 has been neutrally operated after the stop in step S27 and has been stepped forward again (step S31). Further, the CPU 91 waits for the operation pedal 16 to be depressed when there is no front stepping operation of the operation pedal 16, and when it is determined that the operation pedal 16 has been subjected to the front stepping operation, an activation signal and a rotation operation signal are output. The second stitch of the feed stitch is controlled by controlling the stitch forming mechanism and the feed mechanism 30 so that the T stitch stitch starts with the feed stitch having the needle swing length (Y1, ie, the length from B9 to C9). The needle is moved to the drop position (B11 in FIG. 8A) to drop the needle, and then the needle movement at the replaced needle swing length Y1 and the needle movement at the replaced feed length X1 are continued (step S32). Then, the process proceeds to step S24, and the stitch count value N is counted up again when the needle drop occurs when the number of feed stitches is counted.
In this case, the operator does not need to operate the fabric turn switch 95 because a rotation operation signal indicating that the sewing product has been rotated is output together with the start signal by the stepping operation of the operation pedal 16.

Then, the CPU 91 repeatedly executes the processing from step S24 to step S32 until r> 4 is determined in step S28, that is, until sewing is completed for all four sides of the label, and sewing is performed for all four sides. Is completed, an affirmative determination is made in step S28, and thread trimming is automatically executed to end sewing (step S33). This thread trimming process is automatically executed even if the operation pedal 16 is depressed.
Therefore, according to the control shown in FIG. 10, the CPU 91 as the stop control means sets the feed stitch number Mr to the set stitch number Mr. Each time it reaches, a stop signal is output, and the operation pedal 16 outputs a rotation operation signal together with a start signal. Therefore, the operator sets the number of feed stitches for sewing each side of the label according to the label to be sewn once. By doing so, it is possible to easily sew the label without operating the operation pedal 94 for stopping the hand movement in accordance with the corner of the label or the operation means for outputting the rotation operation signal. it can.

  In the control shown in FIG. 10, the operation panel 94 sets the number of stitches for each side sewing process in label sewing. However, before actual sewing, teaching sewing is performed, and the number of stitches for each side is set. It is also possible to store the feed amount and the number of stitches changed by the feed length changing means for each step, and control to reproduce this in actual sewing.

(The invention's effect)
In the sewing machine 1, when the rectangular label L is sewn to the fabric D, when the direction of the hand movement is changed in order to shift from each side of the label L to the next side, In the first T-stitch stitch, the feed amount by the feed mechanism from the first stitch to the second stitch is used as the needle swing width, and the stitch swing width by the needle swing mechanism from the second stitch to the third stitch after the change is used as the feed amount By performing the control, a plurality of needle drop positions (C9 and C11: see FIG. 8A) before and after the change of the feeding direction can be matched.
In particular, in the above process, in the first T-stitch sewing after the change of the feed direction, the feed amount by the feed mechanism from the first stitch to the second stitch is changed immediately before the change and the second stitch after the change is changed from the second stitch. In order to perform operation control in which the needle swing width by the third needle swing mechanism is set to the feed amount immediately before the change, the feed length change input means 50 adjusts the feed amount immediately before the change of the feed direction. Even in this case, this can be reflected, and even in this case, a plurality of needle drop positions (C9 and C11: see FIG. 8B) before and after the change of the feeding direction can be matched.
As described above, a plurality of needle drop positions can be made coincident before and after the change of the needle movement direction, so that the occurrence of crossing of the needle movements and the complicated state of the sewing finish can be eliminated and the sewing quality can be improved. It becomes possible.

  The control device 90 of the sewing machine 1 can set the number of feed stitches in each process by the operation panel 94 or teaching mode. For example, when sewing the same label L repeatedly, the set sewing data is set. By reproducing the above, it becomes unnecessary to determine the operation of the cloth turn switch for each corner portion of the label and the adjustment of the feed amount for each label sewing, and it is possible to improve the workability.

(Other)
The target of sewing by T-stitch sewing of the sewing machine 1 is not limited to the label L, but may be anything that is rectangular or square and can be moved along its outer shape.
For example, in the above embodiment, when the CPU 91 performs the neutral operation of the operation pedal 16 or the stop signal is output every time the number of feed stitches reaches the set number of feed stitches, each mechanism immediately after the formation of the feed stitches. However, it is needless to say that when the stop signal is output, it may be stopped immediately after the formation of the reciprocating needle swing stitch. Even in this case, the needle drop position can be matched before and after the cloth feed direction is changed, and the sewing machine can be automatically stopped at the time of the needle drop outside the label when the cloth feed direction is changed. be able to.

1 is a schematic diagram showing an overall configuration of a sewing machine according to an embodiment of the invention. It is sectional drawing seen from the downward direction of the bed part in the cross section of the II-II part of FIG. It is sectional drawing of the III-III part of FIG. It is a block diagram which shows the periphery structure of the feed amount adjustment motor of a feed amount change means. It is a top view of a feed length change input means. It is a front view which shows the structure of a needle drive mechanism and a needle swing mechanism. Indicates. It is a block diagram which shows the control system of a sewing machine. FIG. 8A is an explanatory view showing a needle drop position in the sewing where the feed adjustment is not performed in front of the label corner, and FIG. 8B is a needle in the sewing in which the feed adjustment is performed in front of the label corner. It is explanatory drawing which shows a fall position. It is the flowchart shown about the operation | movement based on a control apparatus in the case of performing sewing sewing by stopping a sewing machine by operation of an operation pedal. It is the flowchart shown about the operation | movement based on a control apparatus in the case of performing label sewing sewing by automatically stopping a sewing machine with the number of feed stitches preset for every process. FIG. 11A is an explanatory diagram showing one unit of T-stitch sewing, and FIG. 11B is an explanatory diagram showing a state in which T-stitch sewing is continuously performed. FIG. 12 (A) is an explanatory view showing a state in which T-stitch sewing is performed along the outer shape of the label, and FIG. 12 (B) is a needle drop generated at the corner of the label when T-stitch sewing is performed on the label. It is explanatory drawing which shows the cross state of a position.

Explanation of symbols

1 sewing machine 30 feed mechanism 50 feed length change input means 70 needle swing mechanism 90 control device (operation control means)
C Sewing product A10 Needle drop position B10 of the first stitch just before the change of the feed direction B11 Needle drop position B2 of the second stitch just before the change of the feed direction B9 Needle drop position C9 of the second stitch just after the change of the feed direction C9 Needle drop position C11 for the third stitch just before the change Needle drop position X3 for the third stitch just after the change in feed direction X Feed amount setting value Y Needle swing width setting value

Claims (4)

A stitch formation mechanism driven by a drive motor;
A feed mechanism whose feed amount can be changed by electrical control;
A needle swinging mechanism capable of performing needle swinging along a direction perpendicular to the feed direction by the feed mechanism and changing the needle swing amount by electrical control;
A feed stitch having a predetermined feed length formed by driving the stitch formation mechanism and the feed mechanism, and a predetermined needle swing formed orthogonal to the feed stitch by driving the stitch formation mechanism and the needle swing mechanism. Storage means for storing pattern data for forming orthogonal seams consisting of repetitions of reciprocating needle swing seams with a length;
An activation operation means for generating an activation signal by operation;
A stop command means for outputting a stop signal for stopping each of the mechanisms;
In a sewing machine provided with operation control means for controlling the respective mechanisms based on the pattern data to form the orthogonal seam on the sewing product by generating the activation signal,
Based on the stop signal, stop control means for stopping each mechanism at the time of needle drop immediately after formation of the feed stitch of the predetermined feed length or immediately after formation of the reciprocating needle swing stitch of the predetermined needle swing length;
Output means for outputting a rotation operation signal indicating that the sewing product has been rotated by an operation while each of the mechanisms is stopped by the stop signal;
When the activation signal is generated after the rotation operation signal is output, the operation control means has the orthogonal seam composed of the feed stitch having the predetermined needle swing length and the reciprocating needle swing stitch having the predetermined feed length. The sewing machine is characterized in that the respective mechanisms are controlled by changing the predetermined feed length and the predetermined needle swing length so as to be formed. The operation control means stops the mechanisms immediately after forming the feed stitch of the predetermined feed length based on the stop signal, and when the activation signal is generated after the rotation operation signal is output,
2. The sewing machine according to claim 1, wherein each of the mechanisms is controlled so that the orthogonal seam starts from the formation of the feed seam having the predetermined needle swing length. A feed length change input means for changing the feed length of the feed seam during the formation of the orthogonal seam;
The operation control means controls the feed mechanism so that the feed stitch of the feed length changed by the feed length change input means is obtained, and during formation of the feed stitch at the changed feed length. When the stop signal is output and each mechanism is stopped, and then the rotation operation signal and the start signal are generated, the reciprocating needle swing seam formed after the start signal is generated is the changed feed. The sewing machine according to claim 2, wherein the needle swing mechanism is controlled to have a length of needle swing stitches.   Feed stitch number setting means for setting the number of feed stitches in units of the predetermined feed stitch for each sewing process divided by the rotation operation of the work to be sewn, and the stop control means generates the start signal The stop signal is output every time the number of feed stitches formed by moving the needle reaches the set number of feed stitches, and the start operation means outputs the rotation operation signal together with the start signal. The sewing machine according to claim 1.

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