JP5158563B2 - Eyelet hole sewing machine - Google Patents

Description

  The present invention relates to an eyelet sewing machine that forms an eyelet stitching seam on a work cloth.

  The eyelet stitching machine sews the eyelet stitching seam composed of the eyelet stitching stitch and a pair of left and right first straight stitching stitches and a second straight stitching stitch that are continuous with the stitches. The eyelet sewing machine has a sewing mechanism that includes a sewing needle that reciprocates in the vertical direction while carrying an upper thread, and a looper that reciprocates in the left and right direction while carrying a lower thread. The sewing mechanism drives the needle bar provided with the sewing needle and the looper in synchronization. The eyelet sewing machine has a rotation mechanism that rotates the sewing mechanism around the vertical axis, and a feed mechanism that moves the feed base on which the work cloth is placed in the X direction and the Y direction. The eyelet stitching machine is configured to drive and control the sewing mechanism, the feed mechanism, and the rotation mechanism based on various kinds of stitch data such as the eyelet stitching stitches. Form.

  As a kind of such eyelet sewing machine, an eyelet sewing machine in which a core string supply port is provided in the sewing mechanism, and the core string is supplied from the core string supply port to the stitch formation position by the sewing needle and the looper. Is known (see, for example, Patent Document 1).

JP 2005-198968 A

  The eyelet stitching machine performs stitching along the shape of the eyelet hole to form stitches in the order of the first straight stitching stitch, the first stitching stitch, and the second straight stitching stitch. In the eyelet-operated sewing machine using the core string as in the above-described prior art, the sewing mechanism forms the respective stitches while sewing the core string pulled out from the thread supply source via the core string supply port. .

  When forming the above-described eyelet stitches, the sewing mechanism proceeds from the first straight stitches to the second stitches and the second straight stitches. When the above-described prior art eyelet sewing machine is advanced in such a manner, the passage resistance of the core string in the core string supply path in the sewing mechanism may exceed the holding power of the core string at the formed seam. was there. In this case, since the core string is temporarily not paid out from the core string supply port while each stitch is being sewn, the sewing mechanism, for example, from the first straight over stitch that has already been sewn to the cross stitch seam. There was a risk of pulling the core string to the side. As a result, a portion without a core string is generated in the eyelet stitching seam (particularly the first straight stitching seam) provided with the first straight stitching seam, the eyelet stitching stitch, and the second straight stitching stitch. There was a fear.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an eyelet sewing machine capable of preventing a portion without a core string from being generated by pulling the core string in an eyelet stitching seam.

To achieve the above object, according to a first aspect of the present invention, there is provided a sewing needle that reciprocates in a vertical direction while carrying an upper thread, a looper that reciprocates in a horizontal direction while carrying a lower thread, and the sewing needle that moves in a horizontal direction. A sewing mechanism comprising: a swinging needle swinging mechanism; a core string supply port for supplying a core string to a stitch formation position by the sewing needle and the looper; and a rotation capable of rotating the sewing mechanism about a vertical axis. A relative movement mechanism that relatively moves the mechanism, the work cloth, and the sewing mechanism in a plane that intersects the vertical direction of the sewing needle; and a drive unit that drives the sewing mechanism, the rotation mechanism, and the relative movement mechanism. And forming a first straight stitched seam, an eyelet stitched stitch, and a second straight stitched stitch in this order while sewing the core cord drawn from the thread supply source via the core cord supply port. In the eyelet overlock sewing machine, the first straight overlock seam The out the eyelet stitching width is the distance between the darning seam and inner needle position and the outer needle position in the swing direction of the sewing start region of the opposite, the sewing start region of the first straight line buttonhole stitch A control unit for controlling the drive unit is provided so as to be smaller than a sewing width in the swing direction in the first normal region other than the first normal region.

  The eyelet sewing machine according to the first invention of the present application has a sewing mechanism. In the sewing mechanism, the sewing needle reciprocates up and down while swinging left and right by the needle swing mechanism. The looper reciprocates left and right. The sewing mechanism moves relative to the work cloth in a plane intersecting with the up and down direction of the sewing needle by the relative movement mechanism, and rotates around the vertical axis by the rotation mechanism. By such movement, the sewing mechanism uses the upper thread and the lower thread to carry out the stitching along the eyelet shape and form the stitch on the work cloth.

The sewing mechanism forms the seam while sewing the core string in the order of the first linear overlock seam, the pigeon overlock seam, and the second straight over seam. At the time of sewing the first straight stitch, the control unit controls the drive unit. As a result of this control , the sewing width, which is the distance between the position of the inner needle and the position of the outer needle in the swinging direction of the sewing start area, is smaller than the sewing width of the first normal area other than the sewing start area. . Thereby, in the sewing start region, the upper thread and the lower thread forming the stitch hold the core string against the work cloth with a stronger force.

  In the sewing mechanism, after the core string is strongly held in the sewing start area, the sewing proceeds from the first normal area to the eyelet stitches to the second straight stitches. Since the core string holding force in the sewing start area exceeds the core string passage resistance in the core string supply path in the sewing mechanism, the core string is surely secured from the core string supply port at the start of sewing of the first hole seam. Thus, the core string is not drawn from the start sewing region to the eyelet stitching side as in the prior art. As a result, it is possible to prevent a portion without a core string from occurring in the first straight over stitching.

  According to a second invention, in the first invention, the control unit sets the sewing width of the first normal region to a predetermined reference dimension, and makes the sewing width of the sewing start region narrower than the reference dimension. The drive unit is controlled.

  The sewing width in the swing direction of the sewing start area is narrower than the reference dimension of the first normal area other than the sewing start area. As a result, the upper thread and the lower thread forming the seam can hold the core string against the work cloth with a stronger force in the sewing start area than in the first normal area.

  According to a third invention, in the first invention, the control unit sets the sewing width of the sewing start area to a predetermined reference dimension, and makes the sewing width of the first normal area wider than the reference dimension. The drive unit is controlled.

  The sewing width in the swing direction of the sewing start area becomes the reference dimension, and the reference dimension of the first normal area other than the sewing start area is wider than this. As a result, the upper thread and the lower thread forming the seam can hold the core string against the work cloth with a stronger force in the sewing start area than in the first normal area.

According to a fourth aspect of the present invention, in any one of the first to third aspects of the invention, the control unit includes an inner portion in the swing direction of a sewing end region on the opposite side of the eyelet stitches of the second straight stitches . The sewing width, which is the interval between the position of the needle and the position of the outer needle, is made smaller than the sewing width in the swing direction in the second normal region other than the sewing end region of the second straight stitches. The drive unit is controlled.

In the fourth invention of the present application, the control unit controls the drive unit even during the sewing of the second straight overlock seam. As a result of this control , the sewing width, which is the distance between the position of the inner needle and the position of the outer needle in the swing direction of the sewing end region, is smaller than the sewing width of the second normal region other than the sewing end region. . Thereby, in the sewing end region, the upper thread and the lower thread forming the stitch hold the core string against the work cloth with a stronger force. Deviations in the sewing width direction at the end of the core string are reduced, and a beautiful eyelet seam can be obtained.

  According to a fifth invention, in any one of the first to fourth inventions, the needle swing mechanism is configured such that a swing width dimension in a swing operation of the sewing needle is constant, and the control unit includes: In the sewing start region or the sewing end region, movement in the plane by the relative movement mechanism at least partially cancels the swinging operation by the constant swinging width dimension by the needle swinging mechanism. The drive unit is controlled.

  In the fifth invention, the needle swing mechanism swings the sewing needle with a constant swing width. The control unit controls the drive unit corresponding to the constant swing width in the sewing start region or the sewing end region. By this control, the movement in the plane by the relative movement mechanism at least partially cancels the swing operation by the needle swing mechanism. Thereby, the swinging direction sewing width in the sewing start region or the sewing end region becomes narrower than the swinging direction sewing width in the first normal region or the second normal region.

  In a sixth aspect of the present invention based on any one of the first to fifth aspects of the present invention, the controller is configured such that the position of the core string in the sewing start region is closer to the eyelet hole than the position of the core string in the first normal region. The drive unit is controlled so as to approach the vehicle.

  The sewing width in the swinging direction of the sewing start area is narrower than the sewing width in the swinging direction of the first normal area. In the eyelet sewing machine according to the sixth aspect of the present invention, the position of the core string in the sewing start area is set to the eyelet hole side from the position of the core string in the first normal area. Thus, the sewing mechanism bends and sews the core string from the sewing start region to the first normal region, so that a beautiful eyelet seam can be obtained.

  In a seventh aspect based on any one of the first to fifth aspects, the controller is configured such that the position of the core string in the sewing start area and the position of the core string in the first normal area are in a straight line. As described above, the driving unit is controlled.

  The sewing width in the swinging direction of the sewing start area is narrower than the sewing width in the swinging direction of the first normal area. In the eyelet sewing machine according to the seventh aspect of the present invention, the position of the core string in the sewing start area and the position of the core string in the first normal area are aligned. As a result, in the eyelet hole sewing machine according to the seventh aspect of the present invention, the core string can be smoothly pulled out from the core string supply port, and the core string can be further prevented from being pulled into the eyelet side.

  In an eighth invention according to any one of the first to seventh inventions, the relative movement mechanism includes a feed base for setting the work cloth, and an X direction corresponding to the left-right direction and the X direction. An operation capable of setting and inputting the X-direction feed amount or the Y-direction feed amount by the feed mechanism in the sewing start region or the sewing end region. A feature is provided.

  The operator of the eyelet sewing machine can set the feed amount in the X direction or the Y direction of the feed mechanism in the sewing start region or the sewing end region by operating the operation unit. Thereby, the operator can implement | achieve the sewing start area | region or sewing end area | region of a desired shape and aspect.

  According to a ninth invention, in the eighth invention, the operation unit is configured to be able to set and input the number of stitches for sewing the work cloth by the sewing mechanism in the sewing start area or the sewing end area. Features.

  The operator of the eyelet sewing machine can set the number of stitches for sewing the work cloth in the sewing start region or the sewing end region by operating the operation unit. Thereby, the operator can variably set the length in the sewing progress direction of the sewing start area or the sewing end area.

  According to a tenth aspect of the present invention, in the eighth or ninth aspect, the control unit determines whether the Y-direction feed amount by the feed mechanism at the time of sewing in the sewing start area is the first amount according to a setting input of the operation unit. The feed mechanism is controlled so as to be smaller than the feed amount in the Y direction by the feed mechanism during sewing in a normal region.

  The above “smaller than the Y-direction feed amount by the feed mechanism at the time of sewing in the first normal region” includes a case where the Y-direction feed amount is substantially zero. For example, this includes a case where the feed amount in the sewing start area is zero and a case where the feed amount is about 0.1 mm in the direction opposite to the sewing direction in the sewing start area. According to the tenth aspect of the invention, the sewing mechanism not only makes the swinging direction sewing width in the sewing start area smaller than the swinging direction sewing width in the first normal area, but also sets the stitch interval in the sewing start area in the first normal area. It can be made smaller than the stitch interval in the region. Furthermore, the sewing mechanism does not surely pull the portion of the core string in the sewing start area toward the eyelet stitching side.

  According to an eleventh aspect of the present invention, in any one of the first to tenth aspects, the needle swing mechanism includes a guide member formed with a needle bar insertion hole through which a needle bar provided with the sewing needle is vertically movable, and a sewing machine. A holding member that is positioned on the arm portion and is rotatable around a rotation axis, and holds the guide member so as to be slidable back and forth along a predetermined direction intersecting the rotation axis; and A drive body for reciprocating the guide member along the predetermined direction; and a connecting mechanism for operatively connecting the guide member and the drive body so as to allow rotation of the guide member by the holding member. Features.

  In the eleventh aspect of the present invention, the coupling mechanism couples the driving body and the guide member located in the arm portion with rotation allowance. Thereby, the driving force of the driving body is transmitted to the guide member, and the guide member moves up and down. As a result, the guide member slides back and forth along a predetermined direction intersecting the rotation axis of the holding member. The reciprocating guide member has a needle bar insertion hole, and the needle bar moves up and down the needle bar insertion hole. As a result, the eyelet sewing machine according to the eleventh aspect of the present invention can swing the sewing needle in the left-right direction. .

  According to the present invention, it is possible to prevent a portion without a core string from being generated by pulling in the core string in an eyelet stitched seam.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing the entire structure of the electronic eyelet-holed sewing machine M of the present embodiment. FIG. 2 is a front view of the electronic eyelet hole sewing machine M according to the present embodiment. 3 is a cross-sectional view taken along the line III-III in FIG. 1, 2, and 3 show a state in which a punching hammer 226 (described later), a knife 225 (described later), a feed base 228 (described later), and the like are removed from the electronic eyelet hole sewing machine M.

  1 to 3, the electronic eyelet hole sewing machine M includes a bed portion 1 having a substantially rectangular box shape, and an arm portion 2 continuously extending forward from the upper portion of the rear portion of the bed portion 1. Yes.

  A hollow (pipe-like) needle bar 3 having a sewing needle 4 (see FIG. 5 described later) attached to the lower end is provided at the tip of the arm portion 2. The needle bar 3 can be moved up and down by a needle bar vertical movement mechanism 230 described later. Further, the needle bar 3 is moved to the left swing position (= inner needle 4 (Ni), see FIG. 13A described later) and right swing by a predetermined width (= a constant value in this example) by a needle swing mechanism 260 described later. It can be swung left and right to the moving position (= outer needle 4 (No), see FIG. 13A described later).

  The bed unit 1 includes a looper base 11 having a double ring looper mechanism 24 at the top. FIG. 4 is a front view of the looper mechanism 24. In FIG. 4, the looper mechanism 24 has a pair of left and right loopers 10 a and 10 b that are positioned so as to face the needle bar 3 and that form a seam in cooperation with the sewing needle 4. The pair of loopers 10a and 10b swings in synchronism with the vertical movement of the needle bar 3 due to the rotation of the main shaft via a link mechanism and a cam mechanism (not shown) provided on the looper base 11. The sewing needle 4 provided on the needle bar 3 inserts and carries an upper thread US (see FIG. 13 described later) supplied from a thread supply source. The front end portion of the left looper 10a is inserted and supported by a lower thread DS (see FIG. 13 described later). The right looper 10b entangles the lower yarn DS while weaving the upper yarn loop to form a loop coupling portion (details will be described later).

  FIG. 5 is a perspective view of the looper mechanism 24 and a rotation mechanism (described later). In FIG. 5, the rotation mechanism 14 includes a needle bar rotation mechanism 14 </ b> A that rotates the needle bar 3 around the vertical axis, and a looper base rotation that rotates the looper base 11 around the vertical axis in synchronization with the rotation of the needle bar 3. And a mechanism 14B. The rotation mechanism 14 is located in the bed portion 1.

  The looper base rotation mechanism 14B will be described. A drive pulley 20 is fixed to the drive shaft of the θ-direction drive motor 23. A timing belt 22 is hung over the lower pulley 17, the drive pulley 20, and the driven gear 21 of the looper base 11. The needle bar rotating mechanism 14A will be described. Pulleys 16 and 17 are fixed to an upper end portion and a lower end portion of the vertically oriented race rotation shaft 15, respectively. A timing belt 19 is hung over the upper pulley 16 and the needle bar block 18 to which the needle bar 3 is fitted. As a result, the rotation of the θ-direction drive motor 23 causes the needle bar 3 and the looper base 11 to rotate around the vertical axis through the race rotation shaft 15 and the timing belts 19 and 22 in synchronization.

  A throat plate 25 is attached to the top of the looper base 11 so that the height can be adjusted. FIG. 6 is a plan view of the throat plate. FIG. 7 is a perspective view of the throat plate. 6 and 7, the throat plate 25 has a needle hole 25d including a core string insertion hole 25a (core string supply port) through which the core string 30 is inserted, and an inner needle passage position 25b and an outer needle passage position 25c. And form. The inner needle passage position 25b is a location where the sewing needle 4 passes through the throat plate 25 in the inner needle 4 (Ni) (see FIGS. 13 and 14 described later) in which the sewing needle 4 swings inward. The outer needle passage position 25c is a place where the needle 4 passes through the throat plate 25 in the outer needle 4 (No) (see FIGS. 13 and 14 described later) in which the sewing needle 4 swings outward. When forming the eyelet stitching stitch 339 (see FIG. 13A described later), the end of the core string 30 supplied from the core string supply source is directed toward the cloth feeding direction (illustrated by a broken arrow). The core string 30 is sewn with the upper thread US through the string insertion hole 25a.

  FIG. 8 is a conceptual side view of the electronic eyelet hole sewing machine M. As shown in FIG. In FIG. 8, the bed portion 1 and the arm portion 2 have an integral structure and are located on the sewing machine table 204. A knife 225 is detachably provided on a mounting base provided in the bed portion 1. The knife 225 is located on the rear side of the looper base 11 and has a shape of an eyelet hole. A swingable punching hammer 226 contacts and separates from the knife 225 from above.

  A hammer body 227 is detachably attached to the tip of the punching hammer 226. A hammer drive mechanism (not shown) including an air cylinder 252 (see FIG. 15 described later) provided in the bed portion 1 drives the hammer body 227. The hammer body 227 and the knife 225 cooperate to pierce the work cloth with an eyelet hole portion composed of a substantially circular eyelet portion and a linear foot portion connected to the eyelet portion. The bed portion 1 is also provided with a fixed knife (not shown) and a movable knife (not shown) for cutting the lower thread DS and the core string 30.

  On the upper surface of the bed portion 1, a feed base 228 for setting a work cloth used for eyelet stitching is provided. FIG. 9 is a plan view of the feed base 228.

In FIG. 9, the feed base 228 has a thin rectangular box shape as a whole, and is provided with an opening that exposes the looper base 11 and the knife 225 . A pair of left and right cross plates 336 and 337 made of metal are provided so as to cover the opening of the feed base 228. A cloth presser (not shown) is provided on both the left and right sides of the openings 336a and 337a formed in the cross plates 336 and 337 to press the work cloth.

  In the bed portion 1, the feed base 228 is moved in a plane intersecting the vertical direction of the sewing needle 4, that is, in the X direction (left and right direction), and in the Y direction (X direction). And a Y-direction moving mechanism 402 that moves the feed in the front-rear direction orthogonal to the Y-direction.

  FIGS. 10A and 10B are perspective views showing the detailed structures of the X-direction moving mechanism 401 and the Y-direction moving mechanism 402. FIG. 10A and 10B, the X-direction moving mechanism 401 and the Y-direction moving mechanism 402 are operatively connected to a substantially frame-shaped feed base 403 on which the feed base 228 is placed. ing.

  The X-direction moving mechanism 401 includes an X-direction drive motor 410 that is a stepping motor. An X motor gear 411 provided on the output shaft of the X direction drive motor 410 meshes with an idle gear 413 provided on one end of the idle gear shaft 412. An idle gear 414 is also provided at the other end of the idle gear shaft 412. The feed base 403 is provided with a pair of racks 415 and 416 along the X direction. The idle gears 413 and 414 mesh with the racks 415 and 416. The driving force of the X direction drive motor 410 is transmitted to the racks 415 and 416 via the X motor gear 411 and the idle gears 413 and 414. As a result, the feed base 403 moves in the X direction and drives the feed base 228 in the X direction (left-right direction).

  The Y-direction moving mechanism 402 includes a Y-direction drive motor 420 that is a stepping motor. The Y motor gear 421 provided on the output shaft of the Y direction drive motor 420 meshes with the idle gear 422. A timing belt 424 is bridged between the idle gear 422 and the other idle gear 423. The timing belt 424 is fixed to the Y axis 425. A linear bush 426 connects the Y axis 425 to the feed base 403 so as to be movable in the Y axis direction. The driving force of the Y direction drive motor 420 is transmitted to the timing belt 424 and the Y axis 425 through the Y motor gear 421 and the idle gear 422. As a result, the feed base 403 moves in the Y direction and drives the feed base 228 in the Y direction (front-rear direction).

  As shown in FIGS. 1 to 3, a core string supply device 51 is provided inside the arm portion 2 and the bed portion 1. The core string supply device 51 guides the core string 30 to the looper base 11 and locks the core string 30 inside the bed portion 1. The core string supply device 51 includes an upper and lower guide pipe 33, a core string lock mechanism 34, and an in-bed guide path 50. The core string locking mechanism 34 is not necessarily provided.

  A core string guide bar 31 and a core string guide plate 32 are provided at the upper end of the arm portion 2. The core string guide bar 31 and the core string guide plate 32 guide the core string 30 supplied from the core string supply source to the vertical guide pipe 33. The vertical guide pipe 33 extends in the vertical direction to the front surface of the left side portion of the arm portion 2 and guides the core string 30 to the inside of the bed portion 1.

  An in-bed guide path 50 provided inside the bed unit 1 guides the core string 30 to the looper base 11. The in-bed guide path 50 includes a horizontal guide pipe 39 and a core string guide member 40. The horizontal guide pipe 39 guides the core string 30 downstream of the core string lock mechanism 34 (described later) in the core string feeding direction. The core string guide member 40 extends in the front-rear direction on the front and slightly right side of the horizontal guide pipe 39. The core string guide member 40 changes the feeding direction of the core string 30 in the vicinity of the looper base 11.

  A guide piece 41 is erected on the right end portion of the core string guide member 40 via a support portion 42. A core string guide plate 43 is fixed to the front side of the vertical wall 13 at the top of the looper base 11. The front end portion of the core string 30 that has passed through the core string guide plate 43 is inserted into the core string insertion hole 25 a of the throat plate 25.

  The core string locking mechanism 34 is located below the lower end portion of the vertical guide pipe 33 in the middle of the in-bed guide path 50 and on the front right side. The core string locking mechanism 34 includes a solenoid 35, a movable dish member 37, and a fixed member 38. The fixing member 38 includes a guide portion 38a bent to the left and a guide hole 38b provided in the guide portion 38a. The guide hole 38 b guides the core string 30 between the movable dish member 37 and the fixed member 38.

  In the core string locking mechanism 34, when the solenoid 35 is driven and the plunger 36 protrudes to the right, the movable plate member 37 moves to the right. Thereby, the core string locking mechanism 34 is in a locked state in which the core string 30 passing between the movable dish member 37 and the fixed member 38 is locked. When the solenoid 35 is not driven, the plunger 36 is located on the left and the movable plate member 37 is separated from the fixed member 38. Thereby, the core string locking mechanism 34 returns to the normal state in which the core string 30 passing between the movable dish member 37 and the fixed member 38 is released.

  The needle bar up-and-down moving mechanism 230 that drives the needle bar 3 up and down will be described with reference to FIGS.

  FIG. 11 is a perspective view of an internal mechanism in the arm unit 2. In FIG. 11, the main shaft 231 is pivotally supported in a plurality of locations in the arm portion 2. A pulley 232 is fixed to the rear end portion of the main shaft 231. The pulley 232 spans a timing belt 233 between a driving pulley (not shown) fixed to a motor shaft of a sewing machine motor (see FIG. 15 described later). As a result, the main shaft 231 is rotated by the driving force of the sewing machine motor via the timing belt 233.

  An upper shaft crank 234 is fixed to the front end portion of the main shaft 231. A needle bar vertical movement mechanism 230 that moves the needle bar 3 up and down is connected to the upper shaft crank 234. The needle bar vertical movement mechanism 230 includes a needle bar crank 235 having an upper end pivotably attached to an eccentric portion of the upper shaft crank 234, and a vertical movement transmission mechanism 240 interlocked and connected to the needle bar crank 235. Yes.

  The needle bar crank 235 includes a crank body portion 235a and an overhanging crank portion 235b having an L shape in plan view that extends integrally forward from the crank body portion 235a. The overhang support portion 235c, which is the front end portion of the overhang crank portion 235b, is parallel to the crank body portion 235a with a predetermined distance and is directed in the left-right direction.

  The vertical motion transmission mechanism 240 includes a yoke member 241. Between the needle bar crank 235 and the upper shaft crank 234, a plate-shaped rear piece guide plate 247 is disposed in the left-right direction. A plate-shaped front piece guide plate 248 is disposed in the left-right direction immediately in front of the overhanging support portion 235c of the needle bar crank 235. These two piece guide plates 247 and 248 support a yoke member 241 having a substantially rectangular frame shape in plan view so as to be movable up and down. The needle bar crank 235 supports the yoke member 241 in a rotatable manner. Further, a thin plate-like circular support plate 209 made of an elastic material supports the vicinity of the upper end of the needle bar 3 disposed vertically so as to be movable up and down and swingable. The needle bar 3 faces the lower side of the arm portion 203 via a needle swing mechanism 260 described later. When the crank body portion 235a and the overhanging support portion 235c of the needle bar crank 235 are moved up and down synchronously via the upper shaft crank 234 by the rotation of the main shaft 231, the yoke member 241 moves up and down, and the needle bar 3 is moved. Move up and down.

  The needle swing mechanism 260 includes a needle swing drive unit 261 (drive body) and a needle swing main body unit 262. A bevel gear 265 is fixed to the main shaft 231, and a bevel gear 266 that engages with the bevel gear 265 is fixed to a left-right rotation shaft (not shown). A bifurcated portion 268a formed in a bifurcated shape of the swing member 268 is engaged with an eccentric cam plate (not shown) fixed to the rotating shaft. The pivot shaft 269 pivotally supports the lower end portion of the swing member 268 so as to be rotatable. The rear end portion of the connecting rod 270 is connected to one of the forked portions 268a of the swing member 268. The swing adjustment plate 272 is swingable with respect to the left and right support shaft 271. The swing adjustment plate 272 includes a first arm portion 272a in which a curved notch hole 272b is formed. The front end portion of the connecting rod 270 is connected to the notch hole 272 b in the vicinity of the needle bar 3 via a bolt (not shown) and a nut 273. The second arm portion 272 c of the swing adjustment plate 272 is connected to the proximal end portion of the needle swing yoke 274.

  When the nut 273 is loosened and the attachment position of the connecting rod 270 with respect to the notch hole 272b is brought closer to the support shaft 271 side, the swing amount of the second arm portion 272c increases and the needle swing amount of the needle bar 3 increases. On the contrary, when the nut 273 is tightened and the attachment position of the connecting rod 270 with respect to the notch hole 272b is moved away from the support shaft 271, the swinging amount of the second arm portion 272c is reduced, and the needle swing amount of the needle bar 3 is reduced. Becomes smaller.

FIG. 12 is an exploded perspective view showing the detailed structure of the needle swing main body 262 .

  In FIG. 12, a needle bar rotating bracket 280 (holding member) which is a hollow cylindrical body having a circular shape in plan view is secured to a large-diameter through hole (not shown) formed in the lower surface of the head portion of the arm portion 203. It is fitted so that it can rotate in the state. The needle bar rotating bracket 280 includes a cylindrical portion 280a fitted into the through hole, a timing pulley 280b provided at the lower portion thereof, and a pair of leg portions 280c that are suspended from the timing pulley 280b and face each other. Integrated.

  Each leg portion 280c is provided with a storage hole 280d in the lateral direction. A cylindrical needle bar guide member 281 (guide member) is accommodated in the tubular portion 280a so as to be movable up and down. The needle bar guide member 281 includes a long cylindrical member 282 and a rectangular parallelepiped block 283 fixed to the lower end of the cylindrical member 282. The cylindrical member 282 includes a needle bar insertion hole through which the needle bar 3 is inserted so as to be movable up and down. In the assembled state, the cylindrical portion 280a of the needle bar rotating bracket 280 is inserted into the cylindrical member 282, and the block portion 283 is sandwiched between the leg portions 280c and 280c.

  Two oblique grooves 283a and 283a extending in the same direction are formed on two surfaces of the block portion 283 that are in contact with the leg portions 280c and 280c, respectively. The accommodation hole 280d in each leg 280c accommodates the guide pin 284 in a slidable manner. A needle swinging projection 284a that slidably engages with the oblique groove 283a is projected from the tip of the guide pin 284. The other end portion of the guide pin 284 is provided with a bottomed hole portion 284b in the axial direction, and the compression spring 285 is elastically accommodated in the bottomed hole portion 284b. When the trunnion-shaped presser plate 286 sandwiches the leg portion 280c, the opposing tongue pieces 286a and 286a provided on the presser plate 286 close the storage holes 280d and 280d, respectively. As a result, the guide pins 284 accommodated in the respective accommodation holes 280d are urged inward by the compression springs 285, and the needle swinging projection 284a faces the oblique groove 283a of the block portion 283 so as to be slidable.

  A connecting collar 287 is externally attached to the cylindrical member 282 of the needle bar guide member 281. The connecting collar 287 is rotatably sandwiched between a flange 288 provided on the cylindrical member 282 and a fixed collar 289 that is externally inserted from above. The connecting collar 287 includes a connecting pin 287a extending in the horizontal direction. The connecting pin 287a is connected to the bifurcated connecting portions 274a and 274a of the needle swing yoke 274 described above. An annular gap is provided between the inner peripheral surface of the connecting collar 287 and the outer peripheral surface of the needle bar guide member 281. This annular gap allows the needle bar guide member 281 to move slightly with respect to the connecting collar 287. As a result, the needle bar guide member 281 is slightly movable in the front / rear and left / right directions with respect to the connecting collar 287 during the needle swing through the annular gap. The connecting collar 287 and the needle swinging yoke 274 constitute a connecting mechanism that operatively connects the guide member and the driving body so as to allow the guide member to be rotated by the holding member.

  When the needle swing drive unit 261 moves the needle bar guide member 281 up and down via the needle swing yoke 274 and the connecting collar 287, the block unit 283 also moves up and down integrally. As described above, the guide pin 284 having a positional relationship fixed to the arm portion 203 via the presser plate 286 faces the needle swinging projection 284a to the oblique groove 283a of the block portion 283. As a result, the oblique groove 283a guides the block portion 283, and the block portion 283 (and the needle bar guide member 281) swings left and right.

  In the sewing machine having the above configuration, the main shaft 231 is rotated by driving a sewing machine motor 305 (see FIG. 15 described later), and the needle bar 3 swings left and right by a predetermined width using the rotational force of the main shaft 231. To drive. The rotation of the main shaft 231 causes the needle bar 3 to move up and down alternately at the left swing position (inner needle 4 (Ni)) and right swing position (outer needle 4 (No)).

  FIG. 13A is a plan view of an eyelet stitching stitch 339 formed by the eyelet stitching machine M of the present embodiment, and FIG. 13B is a partially enlarged view of FIG. 13 (c) is a cross-sectional view taken along the line PP 'in FIG. 13 (b).

  13A to 13C, the eyelet seam 339 has a right straight seam 339a (first straight seam) and a left straight seam 339b (second straight seam). And an eyelet stitch seam 339c.

  The feed table 228 described above moves in the cloth feed direction (Y direction) indicated by the solid line arrow by the feed pitch by driving the Y direction drive motor 420. When sewing the right straight over stitch 339a and the left straight over stitch 339b, the X direction drive motor 410 and the Y direction drive motor 420 are driven. When sewing the eyelet stitches 339c, the X direction drive motor 410, the Y direction drive motor 420, and the θ direction drive motor 23 are driven. Due to the movement of the feed base 228 and the left and right swinging by the needle swinging mechanism 260, the sewing needle 4 swings alternately and repeatedly over the inner needle 4 (Ni) and the outer needle 4 (No). The inner needle 4 (Ni) is the left-side swinging position approaching the eyelet hole DH, and the outer needle 4 (No) is the right-hand side swinging away from the eyelet hole DH by a predetermined distance. Position. In the figure, the numbers in <> indicate the number of stitches. At this time, the eyelet stitch 339 is formed using the core string 30 supplied as described above. That is, the upper thread US sews the core string 30 indicated by a thick broken line at a substantially intermediate position between the inner needle 4 (Ni) and the outer needle 4 (No).

  FIG. 14 is an explanatory diagram conceptually showing the behavior of a hole stitch.

  As described above, the looper mechanism 24 includes the left looper 10a through which the lower thread DS is passed and the right looper 10b. In FIG. 14, the right looper 10b captures the outer upper thread loop formed when the sewing needle swings from the position of the inner needle 4 (Ni) to the position of the outer needle 4 (No) and penetrates the work cloth. . The right looper 10b passes the inner upper thread loop when the sewing needle swings to the position of the next inner needle 4 (Ni) and penetrates the work cloth into the captured outer upper thread loop.

  On the other hand, the left looper 10a passes the lower thread loop formed by the lower thread DS passed through the tip portion into the inner upper thread loop. Further, the left looper 10a passes the outer upper thread loop formed when the work cloth is penetrated by the next outer needle 4 (No) into the lower thread loop.

  In this way, the left and right loopers 10a and 10b form stitches so that the upper thread US and the lower thread DS are alternately knitted, and the lower thread DS is separated from the outer needle 4 (No) by the inner needle 4 (Ni). Knit in a position biased to the side. As a result, as shown in FIG. 13, the loop coupling portions DSc in which the lower thread loops are entangled are sequentially formed on the plurality of inner needles 4 (Ni) side, that is, on the left side with respect to the stitch formation direction D. ing.

  Hereinafter, control of the electronic eyelet hole sewing machine M for realizing the above-described stitch formation will be described.

  FIG. 15 is a functional block diagram showing a control system of the electronic eyelet hole sewing machine M.

  A control device (control unit) 308 of the electronic eyelet hole sewing machine M includes a CPU 340, a ROM 341, and a RAM 342. An input interface 344 and an output interface 345 are connected to the CPU 340, ROM 341, and RAM 342 via a bus 343.

  The start / stop switch 307, the presser foot switch 347 connected to the presser foot, the timing signal generator 348, and the operation panel 306 (see also FIG. 19 described later) supply respective signals to the input interface 344. The operation panel 306 (operation unit) is provided on the sewing machine table 204, for example. Using the operation panel 306, the operator can alternatively select a desired stitch from among a plurality of types of eyelet stitches.

  The sewing machine motor 305 is driven by a drive circuit 349. The θ direction drive motor 23 is driven by a drive circuit 351. The punching hammer 226 is driven by an air cylinder 352. The electromagnetic switching valve 353 that controls the supply of air to the air cylinder 352 is driven and controlled by a drive circuit 354. The X direction drive motor 410 and the Y direction drive motor 420 that move the feed base 228 are driven by drive circuits 356 and 358, respectively. The output interface 345 supplies drive signals and drive pulse signals to the drive circuits 349, 351, 354, 356, 358 and the operation panel 306.

  The timing signal generator 348 detects the rotational phase of the main shaft 231 of the electronic eyelet sewing machine M and outputs various phase signals.

  The ROM 341 stores various drive control programs for driving the hammer drive mechanism, the feed base 228 and the rotation mechanism 14. The ROM 341 also stores a plurality of types of hole stitch seam data (see FIG. 18 to be described later) and a drive control program (hole stitching) for performing hole stitching based on various hole stitch data. Stitch control program).

  The RAM 342 includes a stitch data memory, various work memories, a buffer, and the like. The stitch data memory is used to store needle drop position data for the inner needle 4 (Ni) and outer needle 4 (No) obtained by calculation, as well as hole stitching data consisting of these multiple needle drop position data. It is.

  Next, a routine for controlling the stitch stitch sewing executed by the control device 308 of the electronic stitch stitch machine M will be described with reference to FIG.

  FIG. 16 is a flowchart showing the procedure of the over-the-edge stitch sewing control executed by the control device 308.

  In FIG. 16, when the operator selects the eyelet stitch 339 to be used for sewing on the operation panel 306 and operates the start / stop switch 307, the control device 308 starts this flow. First, in step S11, the sewing data of the selected eyelet stitching stitch 339 is read from the ROM 341.

  Next, the process proceeds to step S12, where a drive control signal is output to the drive circuit 351, the θ-direction drive motor 23 is driven, and a throat plate rotation process is performed. The throat plate 25 (looper base 11) is rotated and directed toward the stitch formation direction D1 of the right straight stitch 339a (this is defined as 0 °, see FIG. 17A).

  In step S13, a drive control signal is output to the drive circuits 356 and 358, and the X-direction drive motor 410 and the Y-direction drive motor 420 are driven to perform the sewing start position moving process. In other words, the feed base 228 is moved so that the sewing position becomes the sewing start position of the right straight stitch 339a.

  In step S14, a drive control signal is output to the drive circuits 349, 356, and 358, and the sewing machine motor 305, the X-direction drive motor 410, and the Y-direction drive motor 420 are driven to perform a right straight stitch stitching process. . That is, based on the sewing data, sewing of the right straight over stitch 339a is started from the sewing start position Ns (see FIG. 13) (see FIG. 17A).

  In step S15, a drive control signal is output to the drive circuits 349 and 351, the sewing machine motor 305 and the θ direction drive motor 23 are driven, and an eyelet stitch stitching process is performed. That is, based on the sewing data, the eyelet stitch 339c is sewed in the stitch formation direction D2 (see FIG. 17B). At this time, the throat plate 25 is driven to rotate counterclockwise over 0 ° to 180 °.

  In step S16, a drive control signal is output to the drive circuits 349, 356, and 358, and the sewing machine motor 305, the X direction drive motor 410, and the Y direction drive motor 420 are driven to perform a left straight stitch stitch sewing process. That is, based on the sewing data, the left straight over stitch 339b is sewn in the stitch formation direction D3 to the sewing end position Ne (see FIG. 13) (see FIGS. 17C and 11D). In this way, the eyelet seam 339 shown in FIG.

  Returning to FIG. 13, in the basic configuration and operation described above, the greatest feature of the present embodiment is that the right straight over stitch 339a and the left straight over stitch 339b are fed by driving the X and Y direction drive motors 410 and 420. The base 228 is moved and adjusted every time the needle is swung to change the interval (sewing width) between the position of the inner needle 4 (Ni) and the position of the outer needle 4 (No). That is, among the right straight stitch 339a, the sewing width of the sewing start area 339a1 is made smaller than the sewing width (= reference dimension) of the other normal area 339a2 (first normal area). Similarly, of the left straight stitch 339b, the sewing width of the sewing end area 339b2 is made smaller than the sewing width (= reference dimension) of the other normal area 339b1 (second normal area).

  Further, as shown in FIG. 13 and FIG. 18 described later, the Y-direction feed amount Ya in the sewing start area 339a1 is made smaller than the Y-direction feed amount Yo in the first normal area 339a2. Similarly, the Y-direction feed amount Yb in the sewing end region 339b2 is made smaller than the Y-direction feed amount Yo in the second normal region 339b1.

  Further, the position of the core string 30 in the sewing start area 339a1 is closer to the eyelet hole DH side than the position of the core string 30 in the normal area 339a2 at the right straight overlock seam 339a. Similarly, the position of the core string 30 in the region 339b2 is closer to the eyelet hole DH side than the position of the core string 30 in the normal region 339b1.

  FIG. 18 is an explanatory diagram for explaining stitch data for eyelet stitching.

  The stitch data memory of the ROM 341 stores stitch data for the eyelet stitch stitch 339. In this stitch data, as shown in FIG. 18, the needle drop position of the outer needle (the number of even stitches) with respect to the inner needle (the number of odd stitches) is determined for each of the 82 stitches. Therefore, in this stitch data, the drive pulse numbers of the X direction drive motor 410, the Y direction drive motor 420, and the θ direction drive motor 23 are set. Note that the leftward movement of the feed base 228 in the X direction is defined as the “+” side, and the forward movement in the Y direction is defined as the “+” side.

  As shown in FIG. 18 and FIG. 13 described above, among the 82 stitches, the first stitch to the 23rd stitch are stitch data for the stitching of the right straight stitch 339a, of which the first stitch to the fifth stitch are sewn. This is stitch data for overlock stitching in the start area. In this sewing start area, as shown in the drawing, the mechanical movement by the needle swing mechanism 260 is used to cause the feed base 228 to follow the movement direction using the driving force of the X-direction drive motor 410 to cancel the movement amount. doing. As a result, the mechanical swing width is substantially reduced, and the sewing width Wa (see FIG. 13) of the sewing start area 339a is reduced.

  Of the 82 stitches, the 23rd to 61st stitches are stitch data for the stitch stitches of the eyelet stitches 339c.

  Of the 82 stitches, the 61st to 82nd stitches are the stitch data for the stitching of the left straight stitching 339b, and the 78th stitch to the 82nd stitch of the stitching data are the stitching data for the stitching end region 339b2. It is. Also in the sewing end region 339b2, in the same manner as described above, with respect to the mechanical swing by the needle swing mechanism 260, the feed base 228 follows the swing direction using the driving force of the X-direction drive motor 410 to cancel the swing amount. ing. Thereby, the mechanical swinging width is substantially reduced, and the sewing width Wb (see FIG. 13) is reduced.

  In the stitch data in FIG. 18, as described above, the Y-direction feed amount of the sewing start region 339a1 of the right straight stitch 339a is smaller than the Y-direction feed amount of the first normal region 339a2. Similarly, the Y-direction feed amount of the sewing end region 339b2 of the left straight stitch 339b is smaller than the Y-direction feed amount of the normal region 339b1. The Y-direction feed amount can be set to zero, or can be set to a minute amount in the reverse direction. That is, in order to securely hold the core string 30 on the work cloth within the sewing start area 339a1, the sewing needle may be repeatedly swung left and right at substantially the same place in the Y direction.

  FIG. 19 is a front view illustrating an example of the configuration of the operation panel 306.

  In FIG. 19, in this example, the operation panel 306 is related to the eyelet stitching stitch 339 with “stitch length”, “stitch pitch”, “number of stitches”, “number of sewing stitches at the start of sewing”, “sewing pitch at the sewing start” Each item of “Correction amount”, “Number of stitches at the end of sewing at the end of sewing” and “Adjustment amount of stitching width at sewing end” is selectable. The stitch pitch means the feed amount in the Y direction.

  When the “stitch length” display is selected, the length dimension of the right straight stitch 339a and the left straight stitch 339b can be set. When the “stitch pitch” display is selected, it is possible to set the stitch pitch in the right straight stitch 339a, the left straight stitch 339b, and the piggy stitch 339c. When the “number of stitches” display is selected, the number of stitches for the eyelet stitching stitch 339c (39 stitches of the 23rd to 61st stitches in the example of FIG. 18) can be set. When the “sewing start stop stitch number” display is selected, the number of stitches in the sewing start area 339a1 of the right straight stitch 339a (5 stitches from the first stitch to the fifth stitch in the example of FIG. 18) can be set. When the “sewing start stitch width correction amount” display is set, the above-described offset amount (the amount corresponding to +15 pulse and −15 pulse in the example of FIG. 18 above) in the sewing start area 339a1 of the right straight stitch 339a is set. Is possible. In other words, the sewing width Wa in the left-right direction after the cancellation can be set. When the “number of sewing stitches at the end of sewing” display is selected, the number of stitches in the stitching end region 339b2 of the left straight stitch 339b (in the example of FIG. 18, five stitches from the 78th stitch to the 82nd stitch) can be set. When the “sewing end needle swing width correction amount” display is set, the above-described offset amount (the amount corresponding to +15 pulse and −15 pulse in the example of FIG. 18 above) in the sewing end region 339b2 of the left straight stitch 339b is set. Is possible. In other words, the sewing width Wb in the left-right direction after the cancellation can be set.

  The operation panel 306 includes an LED display 306a, a select key 306b, a numerical value up key 306c, and a numerical value down key 306d in order to perform the above various settings. The select key 306b is used for sequentially switching and instructing numerical input for each item. The numerical value up key 306c and the numerical value down key 306d are used to change the numerical value input to each item. The LED display 306a displays the set numerical value with three digits.

  When executing eyelet stitching, the operator operates the keys 306b, 306c, and 306d on the operation panel 306 to set desired values for the items. Numerical values set for each item are stored in the work memory of the RAM 342. Then, when the operator operates the start / stop switch 307, the control device 308 creates the stitch data shown in FIG. Creation of stitch data is as follows.

The control device 308 obtains the number of drive pulses of the X direction drive motor 410 and the number of drive pulses of the Y direction drive motor 420 when calculating from the sewing start position Ns to the needle drop position of the first outer needle. The control device 308 sets the number of drive pulses to the setting of “stitch length”, “stitch pitch”, “number of sewing stitches at the start of sewing”, and “sewing start needle swing width correction amount” on the operation panel 306, and X , Based on the movement pitch amount per pulse of the Y-direction drive motors 410 and 420. The control device 308 obtains the number of drive pulses of the X and Y direction drive motors 410 and 420 corresponding to the sewing start area 339a1 by going through the second stitch, the third stitch,. .

  For the fifth stitch →... → 23 stitch corresponding to the first normal area 339a2 of the right straight stitch 339a after passing through the sewing start area 339a1, the control device 308 sets the number of drive pulses to the operation panel 306. In accordance with the setting of “stitch length” and “stitch pitch”.

  For the 23rd stitch →... → 61th stitch corresponding to the eyelet stitching stitch 339c, the control device 308 determines the number of drive pulses described above as “stitch length”, “stitch pitch”, “number of stitches” on the operation panel 306. Determined according to the setting. In this embodiment, a plurality of eyelet hole shapes are prepared in advance, and the stitch length of the eyelet stitches is a fixed value according to the eyelet hole shape. Accordingly, the stitch length of the stitched stitches is preferably set by selecting a desired stitch length from a plurality of fixed values, but the stitch length corresponding to the stitch hole shape is preferred. It is also possible to directly input the value.

  For the 61st stitch corresponding to the second normal area 339b1 of the left straight stitch 339b before entering the sewing end area 339b2, the control device 308 determines the number of drive pulses on the operation panel 306. Calculated according to the setting of “stitch length” and “stitch pitch”.

  For the 78th stitch →... → 82th stitch corresponding to the second normal area 339b1 of the left straight stitch 339b, the control device 308 sets the number of drive pulses to the “stitch length” “sewing” on the operation panel 306. Obtained in accordance with the settings of “Eye pitch”, “Number of stitches at the end of sewing,” and “Adjustment amount of stitch width at sewing end”.

  When the data creation is completed as described above, the control device 308 executes the control from step S11 in the flow shown in FIG. 16 and sews the eyelet stitch 339.

  In the present embodiment, the needle bar 3 including the sewing needle 4, the looper mechanism 24 including the throat plate 25 and the left and right loopers 10a and 10b, and the needle swinging mechanism 260 constitute the sewing mechanism described in each claim.

  A portion other than the X-direction drive motor 410 in the X-direction moving mechanism 401 and a portion other than the Y-direction drive motor 420 in the Y-direction moving mechanism 402 serve as a feed base in the X direction corresponding to the left-right direction and the X direction. A feed mechanism that feeds and drives in the Y direction orthogonal to the angle is configured. The feed mechanism and the feed base 228 constitute a relative movement mechanism that relatively moves the work cloth and the sewing mechanism within a plane that intersects the vertical direction of the sewing needle. The X-direction drive motor 410, the Y-direction drive motor 420, and the θ-direction drive motor 23 constitute a drive unit that drives the sewing mechanism, the rotation mechanism, and the relative movement mechanism.

  As described above, the eyelet sewing machine M according to the present embodiment has the seam while sewing the core string 30 in the order of the right straight seam 339a, the left eye seam 339c, and the left straight seam 339b. To form. When the right straight stitch 339a is sewn, the swinging direction sewing width Wa of the sewing start area 339a1 is smaller than the swinging direction sewing width Wo of the normal area 339a2 other than the sewing start area 339a1. Thereby, in the sewing start region 339a1, the upper thread US and the lower thread DS forming the stitch hold the core string 30 against the work cloth with a stronger force. In the sewing, the core string 30 is strongly held in the sewing start region 339a1, and then the first normal region 339a2, the eyelet stitching stitch 339c, and the left straight stitching stitch 339b are advanced. The holding force of the core string 30 in the sewing start region 339a1 exceeds the passage resistance of the core string 30 in the core string supply path such as the vertical guide pipe 33 and the in-bed guide path 50 in the core string supply device 51. As a result, the core string 30 is reliably fed out from the core string insertion hole 25a at the start of sewing of the right straight stitch 339a, and the core string 30 is pulled from the start region 339a1 to the eyelet stitch 339c side as before. There is no. As a result, it is possible to prevent a portion without the core string 30 from occurring in the right straight over stitch 339a.

  In the present embodiment, in particular, when sewing the left straight over stitch 339b, the swing direction sewing width Wb of the sewing end region 339b2 is smaller than the swing direction sewing width Wo of the second normal region 339b1 other than the sewing end region 339b2. To do. Thereby, in the sewing end area 339b2, the upper thread US and the lower thread DS forming the stitch hold the core string 30 against the work cloth with a stronger force. Deviation in the sewing width direction at the position of the end of the core string 30 is reduced, and a beautiful eyelet stitched seam can be obtained.

  Particularly in the present embodiment, as shown in FIG. 13, the position of the core string 30 in the sewing start area 339a1 and the sewing end area 339b2 is set to be greater than the position of the core string 30 in the first normal area 339a2 and the second normal area 339b1. It is the eyelet hole DH side. As a result, the eyelet hole sewing machine M bends the core string 30 from the sewing start area 339a1 to the first normal area 339a2 and sews it. From the second normal area 339b1 to the sewing end area 339b2, the core string 30 is bent and sewn. As a result, a beautiful eyelet stitching 339 can be realized.

  In the above-described embodiment, the sewing width Wo of the first normal region 339a2 and the second normal region 339b1 is selected according to a predetermined reference (for example, selected according to the work cloth, the material of the upper thread US, the lower thread DS, the thickness, or the mode of over-stitching) Dimension. Then, the sewing widths Wa and Wb of the sewing start area 339a1 and the sewing end area 339b2 are made smaller than the predetermined reference dimension. However, the present invention is not limited to this. That is, the sewing widths Wa and Wb of the sewing start area 339a1 and the sewing end area 339b2 are set as the predetermined reference dimensions. The sewing width Wo of the first normal area 339a2 and the second normal area 339b1 may be larger than the predetermined reference dimension. Also in this case, the same effect as the above embodiment is obtained.

  In the above embodiment, the sewing start region 339a1 and the sewing end region are obtained by the cooperation of the mechanical left / right swing by the needle swing mechanism 260 and the left / right swing of the feed base 228 by the X direction drive motor 410. The sewing width of 339b2 was reduced. That is, the needle swing mechanism 260 swings the sewing needle 4 with a constant swing width, while the control device 308 controls the X-direction drive motor 410, and the feed base 228 is swung by the needle swing mechanism 260. The movement amount of the needle swinging mechanism 260 was partially offset. However, the present invention is not limited to this. The entire swing amount of the needle swing mechanism 260 may be canceled by the following movement (in other words, the positional relationship between the sewing needle 4 and the work cloth is not changed). Also in this case, the same effect as the above embodiment can be obtained.

  Further, the horizontal swing of the sewing needle 4 is not limited to the combination of the mechanical swing and the swing by the electric driving force as described above. That is, the needle swing mechanism 260 that swings mechanically in the horizontal direction may not be provided, and the horizontal swing of the sewing needle 4 may be performed only by driving control of the X direction drive motor 410. In this case, the control device 308 controls the X-direction drive motor 410 so that the sewing width Wa of the sewing start area 339a1 is smaller than the sewing width Wo of the first normal area 339a2. Furthermore, the control device 308 may control the X-direction drive motor 410 so that the sewing width Wb of the sewing end region 339b2 is smaller than the sewing width Wo of the second normal region 339b1. Also in this case, the same effect as the above embodiment can be obtained.

  The present invention is not limited to the above, and various modifications can be made without departing from the technical idea. Hereinafter, such modifications will be described.

(1) When the feed amount of the sewing start area and the sewing end area is not changed FIGS. 20A and 20B are portions of the eyelet stitching seam 339 formed by the eyelet stitching machine M of this modification. It is an enlarged plan view. These figures correspond to FIGS. 13 (b) and 13 (d), respectively. Parts equivalent to those in the above embodiment are given the same reference numerals.

  In the above embodiment, the feed amount Ya (or Yb) in the sewing start region 339a1 (or the sewing end region 339b2) is made smaller than the feed amount Yo of the first normal region 339a2 (or the second normal region 339b1). 20A and 20B, in this modification, the feed amount in the sewing start region 339a1 (or the sewing end region 339b2) is set to the feed amount in the first normal region 339a2 (or the second normal region 339b1). It is equal to Yo.

  Also in this modification, the same effect as the above embodiment is obtained. That is, due to the difference between the passage resistance and the holding force, the core string 30 is reliably fed out from the core string insertion hole 25a at the start of sewing of the right straight stitch 339a as compared with the conventional case. As a result, it is possible to prevent a portion without the core string 30 from occurring in the right straight over stitch 339a. In addition, in the sewing end region 339b2 of the left straight stitch 339b, the core string 30 can be held with respect to the work cloth with a stronger force, and the shift in the sewing width direction of the position of the end of the core string 30 can be reduced.

(2) When the core string is in the center position in the sewing start area and the sewing end area FIGS. 21A and 21B show an eyelet stitch 339 formed by the eyelet sewing machine M of this modification. FIG. These drawings correspond to FIGS. 13 (b) and 13 (d), or FIGS. 20 (a) and 20 (b), respectively. Portions that are the same as in the above embodiment and the modified example of (1) are given the same reference numerals.

  In the above embodiment and the modified example of (1), the position of the core string 30 in the sewing start area 339a1 and the sewing end area 339b2 is greater than the position of the core string 30 in the first normal area 339a2 and the second normal area 339b1. Part DH side. 21A and 21B, in this modification, the position of the core string 30 in the sewing start region 339a1 (or the sewing end region 339b2) and the first normal region 339a2 (or the second normal region 339b2). ) Of the core string 30 is on a straight line. In other words, the core string 30 is held at the center of the sewing width direction in the sewing start region 339a1 or the sewing end region 339b2.

  In this example, as shown in FIG. 21A, the feed amount Ya in the sewing start region 339a1 is set smaller than the feed amount Yo in the first normal region 339a2. On the other hand, as shown in FIG. 21B, the feed amount in the sewing end region 339b2 is made equal to the feed amount Yo of the second normal region 339b1.

  Also in this modification, the same effect as the above embodiment is obtained. That is, due to the difference between the passage resistance and the holding force, the core string 30 is reliably fed out from the core string insertion hole 25a at the start of sewing of the right straight stitch 339a as compared with the conventional case. As a result, it is possible to prevent a portion without the core string 30 from occurring in the right straight over stitch 339a. In addition, in the sewing end region 339b2 of the left straight stitch 339b, the core string 30 can be held with respect to the work cloth with a stronger force, and the shift in the sewing width direction of the position of the end of the core string 30 can be reduced. In addition, in this modified example, the core string 30 is aligned with the position of the core string 30 in the sewing start area 339a1 and the position of the core string 30 in the first normal area 339a2 so that the core string 30 is positioned in the core string insertion hole 25a. There is also an effect that is drawn smoothly from. As a result, it is possible to further prevent the core string 30 from being pulled toward the eyelet stitch 339c.

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination.

  In addition, although not illustrated one by one, the present invention is implemented with various modifications within a range not departing from the gist thereof.

It is a perspective view showing the whole structure of the electronic eyelet hole sewing machine of one embodiment of the present invention. It is a front view of an electronic eyelet hole sewing machine. It is sectional drawing by the III-III cross section in FIG. It is a front view of a looper mechanism. It is a perspective view of a looper mechanism and a rotation mechanism (after-mentioned). It is a top view of a throat plate. It is a perspective view of a throat plate. FIG. 2 is a conceptual side view of the electronic eyelet hole sewing machine. It is a top view of a feed stand. It is a perspective view showing the detailed structure of an X direction moving mechanism and a Y direction moving mechanism. It is a perspective view of the internal mechanism in an arm part. It is a disassembled perspective view showing the detailed structure of a needle swing main-body part. FIG. 14 is a plan view of an eyelet stitched seam, a partially enlarged view of FIG. 13A, and a cross-sectional view taken along the line PP ′ in FIG. 13B. It is explanatory drawing which represents notionally the behavior of a hole stitching. It is a functional block diagram showing the control system of an electronic eyelet hole sewing machine. It is a flowchart showing the procedure of the overhaul stitch sewing control which a control apparatus performs. It is explanatory drawing explaining the sewing order of an eyelet stitching stitch. It is explanatory drawing explaining the stitch data of an eyelet stitching. It is a front view showing an example of composition of the above-mentioned operation panel. FIG. 10 is a partially enlarged plan view of the eyelet stitching stitch formed by the eyelet stitching machine according to a modified example in which the feed amount of the sewing start region and the sewing end region is not changed. FIG. 10 is a partially enlarged plan view of the eyelet stitching seam formed by the eyelet stitching machine of a modified example in which the core string is at the center position in the sewing start region and the sewing end region.

Explanation of symbols

2 Arm 3 Needle bar (sewing mechanism)
4 Sewing needle 14 Rotating mechanism 23 θ direction drive motor (drive unit)
24 Looper mechanism (sewing mechanism)
25 Throat plate 25a Core string insertion hole (core string supply port)
30 Core string 228 Feed base 260 Needle swing mechanism (sewing mechanism)
261 Needle swing drive unit (drive body)
262 Needle swing body 274 Needle swing yoke (coupling mechanism)
280 Needle bar rotation bracket (holding member)
281 Needle bar guide member (guide member)
287 Connection collar (connection mechanism)
306 Operation panel (operation unit)
308 Control device (control unit)
339 Eyelet seam 339a Right straight seam (first straight seam)
339a1 Sewing start area 339a2 Normal area (first normal area)
339b Left straight over stitch (second straight over stitch)
339b1 normal area (second normal area)
339b2 End-of-sewing area 339c Eyelet stitch seam 401 X-direction drive mechanism 402 Y-direction drive mechanism 410 X-direction drive motor (drive unit)
420 Y direction drive motor (drive unit)
DH Eyelet hole DS Lower thread M Eyelet stitching machine US Upper thread Wa Sewing width at sewing start area Wb Sewing width at sewing end area Wo Sewing width at normal area Ya Feed amount at sewing start area Yb Feed amount at sewing end area Yo Normal area feed amount

Claims (11)

A sewing needle that reciprocates vertically while carrying an upper thread, a looper that reciprocates horizontally while carrying a lower thread, a needle swinging mechanism that swings the sewing needle left and right, and the sewing needle and the looper. A sewing mechanism comprising a core string supply port for supplying a core string to a stitch formation position;
A rotation mechanism capable of rotating the sewing mechanism around a vertical axis;
A relative movement mechanism that relatively moves the work cloth and the sewing mechanism within a plane that intersects the vertical direction of the sewing needle;
A drive unit that drives the sewing mechanism, the rotation mechanism, and the relative movement mechanism;
In an eyelet sewing machine that sequentially forms a first straight stitching seam, an eyelet stitching stitch, and a second straight stitching seam while sewing a core cord pulled out from a thread supply source via the core cord supply port. ,
A sewing width which is an interval between the position of the inner needle and the position of the outer needle in the swinging direction of the sewing start region on the side opposite to the eyelet stitching seam of the first linear stitching seam is defined as the first linear stitching stitch. A piggy hole sewing machine comprising a control unit for controlling the drive unit so as to be smaller than a sewing width in the swing direction in a first normal region other than the sewing start region among stitches.
The eyelet drilling machine according to claim 1,
The controller is
The eyelet sewing machine characterized in that the stitching width of the first normal area is set to a predetermined reference dimension, and the drive unit is controlled so that the sewing width of the sewing start area becomes narrower than the reference dimension. The eyelet drilling machine according to claim 1,
The controller is
The eyelet sewing machine characterized by controlling the drive unit so that the sewing width of the sewing start area is set to a predetermined reference dimension and the sewing width of the first normal area is wider than the reference dimension. . In the eyelet-punching sewing machine according to any one of claims 1 to 3,
The controller is
A sewing width which is an interval between the position of the inner needle and the position of the outer needle in the swinging direction of the sewing end region on the opposite side of the eyelet stitches of the second straight stitches is defined as the second straight stitches. The eyelet sewing machine characterized in that the drive unit is controlled so as to be smaller than a stitching width in the swing direction in a second normal region other than the stitching end region among stitches.
In the eyelet-punching sewing machine according to any one of claims 1 to 4,
The needle swing mechanism is
The swing width dimension in the swing operation of the sewing needle is configured to be constant,
The controller is
In the sewing start region or the sewing end region, movement in the plane by the relative movement mechanism at least partially cancels the swinging operation by the constant swinging width dimension by the needle swinging mechanism. An eyelet sewing machine characterized by controlling the driving unit. In the eyelet-punching sewing machine according to any one of claims 1 to 5,
The controller is
An eyelet sewing machine characterized by controlling the drive unit so that the position of the core string in the sewing start region is closer to the eyelet side than the position of the core string in the first normal region. In the eyelet-punching sewing machine according to any one of claims 1 to 5,
The controller is
The eyelet sewing machine characterized in that the drive unit is controlled so that the position of the core string in the sewing start area and the position of the core string in the first normal area are in a straight line. In the eyelet-punching sewing machine according to any one of claims 1 to 7,
The relative movement mechanism is
A feed base for setting the work cloth;
A feed mechanism that feeds and drives the feed base in an X direction corresponding to the left-right direction and a Y direction orthogonal to the X direction;
An eyelet sewing machine comprising an operation unit capable of setting and inputting the X-direction feed amount or the Y-direction feed amount by the feed mechanism in the sewing start region or the sewing end region. The eyelet-punching sewing machine according to claim 8,
The operation unit is
The eyelet sewing machine characterized in that the number of stitches for sewing the work cloth can be set and input by the sewing mechanism in the sewing start area or the sewing end area. In the eyelet-punching sewing machine according to claim 8 or 9,
The controller is
The Y-direction feed amount by the feed mechanism at the time of sewing in the sewing start area is smaller than the Y-direction feed amount by the feed mechanism at the time of sewing in the first normal area according to the setting input of the operation unit. Further, the eyelet sewing machine characterized by controlling the feeding mechanism. In the eyelet-punching sewing machine according to any one of claims 1 to 10,
The needle swing mechanism is
A guide member having a needle bar insertion hole through which the needle bar provided with the sewing needle is inserted so as to be movable up and down;
A holding member that is located on an arm portion of the sewing machine, is rotatable around a rotation axis, and holds the guide member so as to be slidable along a predetermined direction intersecting the rotation axis;
A driver that is located on the arm portion and reciprocates the guide member along the predetermined direction;
An eyelet drilling machine comprising: a connecting mechanism that operatively connects the guide member and the driving body so as to allow rotation of the guide member by the holding member.

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