JP4492385B2 - Eyelet hole sewing machine - Google Patents

Description

The present invention relates to a grommet stitching machine, when causing particularly swings the needle bar by a needle swing mechanism is an improvement so as not to adversely affect the vertical movement of the needle bar by a needle bar vertically moving mechanism.

  2. Description of the Related Art Conventionally, in a piggy hole sewing machine that sews a piggy hole stitching seam composed of a pigtail stitching stitch and a pair of left and right linear stitching stitches, a needle bar and a looper facing the needle bar are synchronized. Sewing mechanism to be driven and a rotation mechanism that rotates the looper base and needle bar provided with a looper around the vertical axis, and the feed base on which the work cloth is placed is moved in the X and Y directions. A feed mechanism is provided to drive and control the sewing mechanism, the feed mechanism, and the rotation mechanism based on various stitch data such as the eyelet stitching stitches, thereby forming various eyelet stitching stitches. The

  For example, in a buttonhole sewing machine described in Patent Document 1, a needle bar disposed in the vertical direction on the head of an arm portion is supported by a machine frame so as to be vertically movable at a substantially upper end portion thereof, and a needle A needle swing mechanism is provided at the lower end of the bar, and the entire needle bar is swung by the needle swing mechanism. Further, the needle bar hug is fixed to the middle step in the height direction of the needle bar, and rotated by the main shaft. A crank rod driven by a driven needle bar crank is connected to a needle bar holder.

  Therefore, when the main shaft is rotationally driven by the sewing machine motor, the needle bar is moved up and down via a crank transmission device composed of a crank rod driven by these needle bar cranks, and the needle swinging mechanism is driven by another system. Therefore, eyelet stitches are formed on the fabric placed on the feed base.

Japanese Patent Laid-Open No. 11-276736 (page 4, FIG. 2)

As described above, in the buttonhole sewing machine described in Patent Document 1, as shown in FIG. 16 , the vicinity of the upper end of the needle bar 8 is connected to the machine frame F via the circular support plate 9 made of a thin elastic material. The needle bar 8 swings while changing the swinging direction over 360 ° by the needle swinging mechanism 62 attached to the lower end of the needle bar 8. Since it is connected to the crank transmission device 100 in the middle step in the height direction, the crank transmission device 100 acts to suppress the swinging motion.

  Therefore, when the needle bar 8 is swung while changing its swinging direction, the needle bar 8 has a large bending force that bends only at a lower portion than the middle step portion where the crank transmission device 100 is provided. Comes to work. As a result, since the needle bar 8 is formed of a hollow pipe member and has rigidity against bending force, the needle bar 8 is engaged with the inclined groove for generating the needle swing inside the needle swing mechanism 62. The frictional force with the guide pin increases and heat is generated.

  In particular, when sewing an eyelet sewing machine at a high speed, the amount of heat generated is increased, the wear of the inclined shape and the guide pin becomes severe, not only lacking durability, but also the vertical movement stroke of the needle bar 8 and Problems such as a decrease in the dimensional accuracy of the amount of needle swing and an error in the timing at which the sewing needle 8 encounters the looper occur.

The eyelet sewing machine according to claim 1 includes a needle bar to which a sewing needle is attached, a needle bar up-and-down moving mechanism for moving the needle bar up and down, a needle swinging mechanism for swinging the needle bar, and a needle bar that has an axial center thereof. In an eyelet sewing machine comprising a needle bar rotation mechanism that can rotate around and a looper base rotation mechanism that can rotate a looper base that supports the looper in synchronization with the rotation of the needle bar. The bar vertical movement mechanism has a needle bar crank linked to the main shaft of the sewing machine and a vertical movement transmission mechanism linked to the needle bar crank. The vertical movement transmission mechanism opens a swinging clearance in the needle bar. An annular member that is externally fitted and operatively connected to the needle bar crank, and a pair of upper and lower needle bar holding members that are externally fitted to the needle bar and fixed to the needle bar and disposed on both upper and lower sides of the annular member . And a pair of upper and lower washer members slidably provided on the upper and lower surfaces of the annular member. It is obtained by a needle bar clamp member pair of upper and lower disposed contact form on both sides.

  When the sewing machine motor is driven to rotate, the needle bar vertical movement mechanism driven via the main shaft, that is, the drive side of the needle bar crank linked to the main shaft is rotated. The other end of the interlocking connection is moved up and down, the needle bar is moved up and down by the vertical movement transmission mechanism, and the sewing needle attached to the lower end of the needle bar is moved up and down.

  Further, the looper supported by the looper base is driven in synchronism with the needle bar, and the needle bar is rotated around its axis by the needle bar rotating mechanism, and the looper base is rotated with the rotation of the needle bar. Since it is rotated by the looper base rotating mechanism in synchronism, the eyelet stitching seam is formed by the cooperation of the sewing needle attached to the lower end of the needle bar and the looper.

  Here, in the vertical motion transmission mechanism, an annular member is operatively connected to the needle bar crank, and needle bar holding members disposed on both upper and lower sides of the annular member are fitted around the needle bar and fixed to the needle bar. Therefore, the annular member moves up and down in synchronization with the vertical movement of the needle bar crank, and the needle bar holding member also moves up and down at the same time. Therefore, the needle bar is driven up and down by these needle bar holding members.

  By the way, since the rocking gap is opened in the annular member, even when the needle bar is swung by the needle swing mechanism during sewing, the needle bar does not come into contact with the ring member by the rocking gap. The needle bar can swing with vertical movement without any trouble. Therefore, at the time of needle swinging, there is no adverse effect on the needle bar up-and-down moving mechanism and the needle swinging mechanism, and the eyelet seam is formed.

Eyelet buttonhole sewing machine according to claim 2, in claim 1, wherein the vertical movement transmission mechanism includes a guided frame mounted to the needle bar crank guide thus guided frame is possible only movement in the vertical direction And a guide mechanism provided with a guide groove formed in a machine frame of the sewing machine.

Eyelet buttonhole sewing machine according to claim 3, in claim 1, wherein the vertical movement transmission mechanism includes a guided frame mounted on an annular member, the guided piece is guided so as to be moved only in the vertical direction A guide mechanism having a guide groove and a guide groove formed in a machine frame of the sewing machine is provided.

Eyelet buttonhole sewing machine according to claim 4, in any one of claims 1-3, wherein the vertical movement transmission mechanism further, the needle bar crank, via a horizontal first shaft perpendicular to the axis of the needle bar And a second support shaft that rotatably supports the annular member on the yoke member, and a horizontal second support orthogonal to the axis of the needle bar and the first support shaft. And a shaft.

Eyelet buttonhole sewing machine according to claim 5, in claim 4, wherein the vertical movement transmission mechanism includes a guided frame mounted on the yoke member, the guided piece is guided so as to be moved only in the vertical direction A guide mechanism having a guide groove and a guide groove formed in a machine frame of the sewing machine is provided.

Eyelet buttonhole sewing machine according to claim 6, in any one of claims 2, 3, 5, wherein the guide mechanism includes a pair of guided pieces, the guide groove of a pair for guiding the guided pieces of the pair It has.

According to the first aspect of the present invention, in the eyelet drilling machine provided with the needle bar to which the sewing needle is attached, the needle bar vertical movement mechanism, the needle swinging mechanism, the needle bar rotation mechanism, and the looper base rotation mechanism, kinematic mechanism and a needle bar crank and vertical motion transmission mechanism, vertical movement transmitting mechanism since a needle bar clamp member pair of upper and lower annular member, the sewing machine motor via a driven rotary spindle needle When the bar vertical movement mechanism is driven, the annular member operatively connected to the needle bar crank moves up and down, and at the same time, the needle bar holding member also moves up and down, and the needle bar is driven up and down by these needle bar holding members. On the other hand, when the needle bar is swung, the needle bar does not come into contact with the annular member due to the swinging clearance provided in the annular member, and when the needle bar is swung, The needle bar moves up and down. It is possible to enhance the durability of the structure and the needle swing mechanism. In addition, it is possible to increase the dimensional accuracy of the vertical movement stroke of the needle bar and the needle swing amount.

Further, the pair of upper and lower needle bar holding members are disposed in contact with the upper and lower surfaces of the pair of upper and lower washer members slidably provided on the upper and lower surfaces of the annular member. If the slidability of the washer member is increased, the frictional resistance between the pair of upper and lower washer members and the annular member can be greatly reduced to suppress the heat generating action, and the swinging motion of the needle bar with respect to the annular member can be smoothly performed. Can be achieved .

According to the invention of claim 2, the vertical movement transmission mechanism is a guided piece mounted on the needle bar crank, and a guide groove for guiding the guided piece so as to be movable only in the vertical direction. Since it has a guide mechanism provided with a guide groove formed in the machine frame of the sewing machine, the guided piece mounted on the needle bar crank can be guided by the guide mechanism so as to move only in the vertical direction. The stability of the vertical movement of the member, that is, the stability of the vertical movement of the needle bar can be enhanced. Other effects similar to those of any one of the first aspect are achieved.

According to a third aspect of the present invention, the vertical motion transmission mechanism includes a guided piece mounted on the annular member, and a guide groove for guiding the guided piece so as to be movable only in the vertical direction. Since the guide mechanism provided with the guide groove formed in the machine frame can guide the guided piece mounted on the annular member so as to move only in the vertical direction, The stability of vertical movement, that is, the stability of vertical movement of the needle bar can be enhanced. Other effects similar to those of the first aspect are obtained.

According to a fourth aspect of the present invention, the vertical movement transmission mechanism further includes a yoke member rotatably supported by the needle bar crank via a horizontal first support shaft orthogonal to the axis of the needle bar. And the second support shaft that rotatably supports the annular member on the yoke member, the shaft member including the axis of the needle bar and the second support shaft that is perpendicular to the first support shaft. The annular member is rotatably supported by the yoke member via the second support shaft.

That is, since the annular member is supported by the needle bar crank as a universal joint, even when the washer member changes from a horizontal position to an inclined position when the needle bar swings, the annular member is connected to the needle bar crank as a universal joint. Such support can surely absorb the inclination of the washer member, and the needle bar can be moved up and down and swung. Other effects similar to those of any one of claims 1 to 3 are achieved.

According to a fifth aspect of the present invention, the vertical motion transmission mechanism includes a guided piece mounted on the yoke member and a guide groove for guiding the guided piece so as to be movable only in the vertical direction. Since the guide mechanism provided with the guide groove formed in the machine frame can be guided so that the guided piece mounted on the yoke member moves only in the vertical direction by the guide mechanism, the annular member The stability of vertical movement, that is, the stability of vertical movement of the needle bar can be enhanced. Other effects similar to those of the fourth aspect are achieved.

According to the invention of claim 6 , since the guide mechanism has a pair of guided pieces and a pair of guide grooves for guiding the pair of guided pieces, the pair of guided pieces and The stability of the vertical movement of the annular member and the vertical movement of the needle bar can be remarkably enhanced by the guide groove. Other effects similar to those of any one of claims 2 , 3 , and 5 are achieved.

  The electronic eyelet hole sewing machine according to the present embodiment is a ring that is operatively connected to a needle bar crank that is a drive source of needle bar vertical movement, to a vertical movement transmission mechanism that is provided in a needle bar vertical movement mechanism that moves the needle bar up and down. A member is provided, and a swinging clearance is formed inside the annular member to allow swinging for needle swinging of the needle bar that moves up and down.

  As shown in FIGS. 1 and 2, the electronic eyelet sewing machine 1 is integrally provided with a bed portion 2 having a substantially rectangular box shape and an arm portion 3 that continuously extends forward from the upper portion of the rear portion. It is configured and placed on the sewing machine table 4. On the upper side of the sewing machine table 4, there are provided an operation panel 5 for instructing various operations such as selective selection from a plurality of types of eyelet stitches, and on the lower side of the sewing machine table 4, A control device 6 comprising a microcomputer for controlling the operation of each mechanism is provided.

  A hollow (pipe-like) needle bar 8 having a sewing needle 7 attached to the lower end is provided at the distal end of the arm portion 3 so as to be movable up and down by a needle bar vertical movement mechanism 30 described later. The needle swing mechanism 60 can swing left and right between the left swing position (inner needle position) and the right swing position (outer needle position) by a predetermined width.

  Further, as shown in FIG. 3, the bed portion 2 includes a sewing machine motor (not shown) serving as a driving source of a sewing mechanism that drives the needle bar 8 up and down and swings, and the looper mechanism 10 and the like synchronously. Is provided with a looper base 11 having a looper mechanism 10 having a pair of left and right loopers (not shown). The looper base 11 is integrally rotated around a vertical axis by a rotation mechanism 15 described later. It is possible.

  Here, the upper thread supplied from the thread supply source is inserted into the sewing needle 7, the lower thread is inserted into the tip of the left looper, and the right looper interlaces the lower thread while weaving the upper thread loop. Forming a loop coupling.

  Next, the needle bar 8 and the looper base 11 are integrally rotated around the vertical axis in the horizontal plane by the rotation mechanism 15 including the θ-direction drive motor 21 and the gear mechanism provided in the bed portion 2. It has become. Next, a turning mechanism 15 capable of turning the needle bar 8 and the looper mechanism 10 about the vertical axis will be briefly described with reference to FIG.

  Pulleys 17 and 18 are fixed to the upper end and the lower end of the vertical race rotation shaft 16, respectively, and the timing belt 20 is hooked over the upper pulley 17 and the needle bar block 19 in which the needle bar 8 is fitted. It is disguised. On the other hand, a timing belt 24 is hung over the lower pulley 18, the drive pulley 22 fixed to the drive shaft of the θ-direction drive motor 21, and the driven gear 23 of the looper base 11.

  Therefore, the rotation of the θ-direction drive motor 21 allows the needle bar 8 and the looper base 11 to rotate around the vertical axis synchronously via the race rotation shaft 16 and the timing belts 20 and 23. Yes.

  Here, the rotation mechanism 15 includes a needle bar block 19, a timing belt 20, a pulley 17 fixed to the race rotation shaft 16, a timing belt 24, a θ-direction drive motor 21, and the like. The needle bar 8 includes a needle bar rotating mechanism 15A capable of rotating the needle bar 8 about its axis, a driven gear 23 of the looper base 11, a timing belt 24, a θ-direction drive motor 21, and the like. A looper base rotation mechanism 15B that can be rotated by the θ-direction drive motor 21 in synchronization with the rotation is included.

  As shown in FIG. 2, the bed 2 has a knife 25 that is fixedly disposed on the rear side of the looper base 11 to form a eyelet hole portion, and is attachable to and detachable from a mounting base (not shown) with bolts. A punching hammer 26 that is attached to and is separated from the knife 25 from above is provided in the arm portion 3 so as to be swingable up and down.

  A hammer main body 27 is detachably attached to the tip of the punching hammer 26 and is driven by a hammer drive mechanism (not shown) including an air cylinder provided in the bed portion 2. By the cooperation of No. 25, an eyelet hole portion composed of a substantially circular eyelet portion and a linear foot portion connected to the eyelet portion is punched in the work cloth.

  As shown in FIGS. 1 and 2, a feed base 28 on which a work cloth used for eyelet stitching is set is provided on the upper surface of the bed 2. The feed base 28 has a thin rectangular box shape as a whole, and a portion facing the looper base 11 and the knife 25 is open. Further, although not shown, a pair of left and right cross plates made of metal are provided on the upper surface of the feed base 28, respectively.

  In the bed portion 2, an X-direction moving mechanism (not shown) for feeding and moving the feed base 28 in the X direction (left-right direction) by driving an X-direction drive motor (not shown) composed of a stepping motor, and a stepping motor There is provided a Y-direction moving mechanism (not shown) that feeds and moves in the Y-direction (front-rear direction) by driving a Y-direction drive motor (not shown).

  Next, the needle bar vertical movement mechanism 30 that drives the needle bar 8 up and down by the main shaft 31 disposed in the front-rear direction in the arm portion 3 will be described.

  As shown in FIGS. 4 to 6, the main shaft 31 is rotatably supported by the machine frame F at a plurality of locations, and is fixed to the pulley 32 fixed to the rear end portion of the main shaft 31 and the motor shaft of the sewing machine motor. A timing belt 33 is mounted on a driving pulley (not shown), and the main shaft 31 is rotationally driven by the sewing motor through the timing belt 33.

  An upper shaft crank 34 is fixed to the front end portion of the main shaft 31, and a needle bar vertical movement mechanism 30 that moves the needle bar 8 up and down is connected to the upper shaft crank 34. This needle bar vertical movement mechanism 30 includes a needle bar crank 35 whose upper end is pivotally attached to an eccentric portion of the upper shaft crank 34, and a vertical movement transmission mechanism 40 that is interlocked with the needle bar crank 35. Have.

  As shown in FIGS. 4 to 6, the needle bar crank 35 is composed of a crank main body portion 35 a and a projecting crank portion 35 b having an L shape in plan view that extends integrally forward from the crank main body portion 35 a. The overhang support portion 35c, which is the front end portion of the overhang crank portion 35b, is formed parallel to the crank body portion 35a at a predetermined distance and in the left-right direction.

  Next, the vertical motion transmission mechanism 40 will be described. The vertical motion transmission mechanism 40 includes a yoke member 41 supported by the needle bar crank 35 via a first support shaft 42, an annular member 43 supported by the yoke member 41 via a second support shaft 44, A pair of front and rear piece guide plates 47 and 48 having a pair of front and rear guided pieces 45 and 46 mounted on the needle bar crank 35 and guide grooves 47a and 48a for guiding the pair of guided pieces 45 and 46, etc. , A pair of washer members 51 provided on both upper and lower surfaces of the annular member 43, and a pair of upper and lower needle bar holders 52, 53 fixed to the needle bar 8 (this is the needle bar holders 52, 53). Corresponding to the member).

  As shown in FIGS. 4 to 10, between the needle bar crank 35 and the upper shaft crank 34, a plate-like rear piece guide plate 47 is disposed in the left-right direction and is fixed to the machine frame F. On the other hand, a plate-like front piece guide plate 48 is disposed in the left-right direction immediately in front of the overhanging support portion 35c of the needle bar crank 35, and is connected to the rear piece guide plate 47 via a plurality of connecting shafts 54 and 55. It is fixed. However, the rear piece guide plate 47 and the front piece guide plate 48 face each other in parallel.

  A linear guide groove 47a extending in the vertical direction is formed in the center in the left-right width direction on the front surface of the rear piece guide plate 47, and also extending in the vertical direction in the center in the left-right width direction on the rear surface of the front piece guide plate 48. A linear guide groove 48a is formed. By the way, a yoke member 41 having a substantially rectangular frame shape in plan view is disposed between the two piece guide plates 47 and 48 and is rotatably supported by the needle bar crank 35 by a pair of front and rear first support shafts 42. ing.

  A substantially front half portion of the first horizontal support shaft 42 in the horizontal front-rear direction on the rear side through which the crank body 35 a is inserted is fitted into the rear pivot support portion 41 a of the yoke member 41, and the rear end of the first support shaft 42 The portion is pivotally supported by the rear guided piece 45, and the guided piece 45 is engaged with the guide groove 47a of the rear piece guide plate 47 so as to be movable up and down. However, the first support shaft 42 is fixed to the crank body 35 a by a fixing pin 56.

  In addition, the front half of the first support shaft 42 in the front-side horizontal front-and-rear direction passing through the overhanging support portion 35 c is fitted into the front support portion 41 b of the yoke member 41, and the front end portion of the first support shaft 42 is inserted. Is pivotally supported by the front guided piece 46, and the guided piece 46 is engaged with the guide groove 48a of the front piece guide plate 48 so as to be vertically movable. However, the second support shaft 44 is fixed to the overhanging support portion 35 c by a fixing pin 57.

  Therefore, the yoke member 41 is pivotally supported by the needle bar crank 35 through the pair of front and rear first support shafts 42, and the pair of guided pieces 45 and 46 and the guide groove. It is supported by a pair of front and rear piece guide plates 47 and 48 through the engagement with 47a and 48a so as to be movable up and down.

  Incidentally, a substantially annular member 43 is disposed inside the yoke member 41 in a plan view having a predetermined height. As shown in FIG. 10, the annular member 43 is larger than the diameter of the needle bar 8, that is, has a size in which a swinging clearance S of the needle bar 8 is opened. Protruding pivotal support portions 43a and 43b are respectively formed. The substantially right half portion of the horizontal second horizontal support shaft 44 is fitted into the left pivot portion 43a of the annular member 43, and the left end portion of the second support shaft 44 rotates to the left support portion 41c of the yoke member 41. It is freely pivoted.

  Further, a substantially left half portion of the horizontal second horizontal support shaft 44 is fitted into the right pivot portion 43 b of the annular member 43, and the right end portion of the second support shaft 44 is connected to the right support portion 41 d of the yoke member 41. It is pivotally supported. Here, the horizontal pair of first support shafts 42 and the horizontal pair of left and right second support shafts 44 are orthogonal to each other.

  That is, the annular member 43 is supported by the needle bar crank 35 as a universal joint by the pair of front and rear first support shafts 42 and the pair of left and right second support shafts 44. Therefore, the annular member 43 can rotate around the axis of the first support shaft 42 via the first support shaft 42, and the periphery of the axis of the second support shaft 44 via the second support shaft 44. Can be rotated.

  As shown in FIGS. 4 to 5 and FIGS. 8 to 9, the needle bar 8 arranged in the vertical direction has a thin plate shape and a circular shape made of an elastic material fixed to the machine frame F in the vicinity of the upper end thereof. The support plate 9 is supported so as to be movable up and down and swingable, extends downward through the inside of the annular member 43, faces the lower side of the arm portion 3 through a needle swing mechanism 60 to be described later, and has a lower end portion thereof. A sewing needle 7 is attached.

  By the way, a circular upper washer member 51 in which a hole having the same dimension as the outer shape of the needle bar 8 is formed in the center is slidably disposed on the upper side of the annular member 43, and a circular lower portion similarly configured is also provided. A side washer member 51 is slidably disposed on the lower side of the annular member 43, and the needle bar 8 is inserted through the washer members 51 on both the upper and lower sides in the middle step portion.

  Further, the needle bar 8 is fixedly attached with an upper needle bar hug 52 disposed in contact with the upper surface of the upper washer member 51 and disposed in contact with the lower surface of the lower washer member 51. A lower needle bar holder 53 is fixed. That is, when the crank body portion 35a and the overhanging support portion 35c of the needle bar crank 35 are moved up and down synchronously via the upper shaft crank 34 by the rotational drive of the main shaft 31, a pair of front and rear first support shafts 42 and front and rear Since the yoke member 41 moves up and down via the engagement between the pair of guided pieces 45 and 46 and the guide grooves 47a and 48a, the annular member 43 moves up and down via the pair of left and right second support shafts 44. The needle bar 8 is moved up and down by the upper and lower needle bar holders 52 and 53.

  At this time, when the needle bar 8 is moved up and down and moved back and forth and left and right by a needle swing mechanism 60 described later, the washer members 51 on both the upper and lower sides are slidable with respect to the annular member 43. 8 can swing back and forth and right and left without any support. When the needle bar 8 is swung, even if the pair of upper and lower needle bar holders 52 and 53 and the pair of upper and lower washer members 51 fixed to the needle bar 8 are changed from the horizontal posture to the inclined posture, the annular member 43 is Since the above-described universal joint is supported on the bar crank 35, the tilt of the washer member 51 can be absorbed with certainty, and the needle bar 8 can move up and down and swing.

  Next, the needle swing mechanism 60 will be described. As shown in FIGS. 4 to 6, the needle swing mechanism 60 includes a needle swing drive unit 61 and a needle swing main body 62. First, the needle swing drive unit 61 will be described.

  A bevel gear 66 that is engaged with a bevel gear 65 fixed to the main shaft 31 is fixed to a left and right rotating shaft 67, and an oscillating member 68 is attached to an eccentric cam plate (not shown) fixed to the rotating shaft 67. The bifurcated portion 68a formed in a bifurcated shape is engaged. The swing member 68 is pivotally supported by a pivot shaft 69 fixed to the machine frame F at the lower end thereof.

  The rear end portion of the connecting rod 70 is connected to one of the bifurcated portions 68 a of the swing member 68, and the front end portion of the connecting rod 70 swings to the left and right support shaft 71 in the vicinity of the needle bar 8. A possible notch 72 b formed in the first arm portion 72 a of the swing adjustment plate 72 that can be connected via a bolt (not shown) and a nut 73. The second arm portion 72 c of the swing adjustment plate 72 is connected to the proximal end portion of the needle swing yoke 74.

  Here, the nut 73 that fixes the front end portion of the connecting rod 70 is loosened, and the mounting position of the front end portion of the connecting rod 70 with respect to the curved cutout hole 72b is brought closer to the support shaft 71 side of the swing adjustment plate 72. In this case, the swing amount of the second arm portion 72c is increased, and the needle swing amount of the needle bar 8 can be increased. On the other hand, when the swing arm is moved away from the support shaft 71 of the swing adjustment plate 72, the second arm portion 72c The swing amount is reduced, and the needle swing amount of the needle bar 8 can be reduced.

  Next, the needle swing main body 62 will be described. As shown in FIG. 11, the needle bar rotation bracket 80 having a circular shape in plan view is rotatably fitted in a large-diameter through hole (not shown) formed in the lower surface of the head portion of the arm portion 3 in a state of retaining. ing. The needle bar rotating bracket 80 is basically formed of a hollow cylindrical body, and has a cylindrical portion 80a inserted into the through hole, a timing pulley 80b provided in the lower portion thereof, and a suspension 1 facing the timing pulley 80b. A pair of leg portions 80c are integrally provided.

Each leg 80c has a storage hole 80d in the lateral direction. A cylindrical needle bar guide member 81 is accommodated in the cylindrical portion 80a of the needle bar rotating bracket 80 so as to be movable up and down. The needle bar guide member 81 includes a long cylindrical member 82 and a rectangular parallelepiped block 83 fixed to the lower end of the cylindrical member 82.

  In the assembled state, the cylindrical member 82 is inserted into the cylindrical portion 80 a of the needle bar rotating bracket 80, and at this time, the block portion 83 is sandwiched between the leg portions 80 c of the needle bar rotating bracket 80. Is located.

Note that two oblique grooves 83a extending in the same direction are formed on two surfaces of the block portion 83 that are in contact with the respective leg portions 80c . Moreover, the guide pin 84 is slidably accommodated in the accommodation hole 80d in each leg portion 80c . A needle swinging projection 84a that slidably engages with the oblique groove 83a is projected at the tip of the guide pin 84, and a bottomed hole 84b is bored in the axial direction at the other end. The compression spring 85 is elastically accommodated in the bottomed hole portion 84b.

  When the leg portion 80c is clamped by the trunnion-shaped presser plate 86, the opposing tongue piece 86a in the presser plate 86 correspondingly closes the storage hole 80d, so that the guide pin 84 received in each storage hole 80d is compressed by the compression spring 85. The needle swinging projection 84a is urged inward to slidably face the oblique groove 83a of the block 83.

  A connecting collar 87 is extrapolated to the cylindrical member 82 of the needle bar guide member 81, and is rotatably sandwiched between a flange 88 provided around the cylindrical member 82 and a fixed collar 89 extrapolated from above. Yes. The connecting collar 87 includes connecting pins 87 a extending in the horizontal direction, and these connecting pins 87 a are connected to a bifurcated connecting portion 74 a of the needle swing yoke 74.

  Therefore, when the needle bar guide member 81 is moved up and down through the needle swing yoke 74 and the connecting collar 87 by the needle swing drive unit 61 described above, the block unit 83 also moves up and down integrally. At this time, the guide pin 84 in the relationship fixed to the arm portion 3 by the presser plate 86 has its needle swinging projection 84a facing the oblique groove 83a of the block portion 83, so that the block portion 83 (and the needle) The rod guide member 81) is guided by the oblique groove 83a and swings left and right.

  As described above, the needle bar guide member 81 is inserted into the connecting collar 87, and the needle bar is interposed between the inner peripheral surface of the connecting collar 87 and the outer peripheral surface of the needle bar guide member 81. An annular gap that allows the guide member 81 to move slightly with respect to the connecting collar 87 is formed. That is, the needle bar guide member 81 is slightly movable in the front / rear and left / right directions with respect to the connecting collar 87 during the needle swing due to the presence of the annular gap.

  Next, the operation and effect of the electronic eyelet hole sewing machine 1 configured as described above will be described.

  During sewing, when the sewing machine motor is driven to rotate, the main shaft 31 is simultaneously driven via the timing belt 33 and the pulley 32, and the upper shaft crank 34 and the upper end of the needle bar crank 35 connected thereto are rotated. Therefore, the crank body 35a and the overhanging support 35c are moved up and down in a straight line through the engagement between the pair of guided pieces 45 and 46 and the guide grooves 47a and 48a.

  At this time, as described above, the yoke member 41 connected to the needle bar crank 35 via the pair of front and rear first support shafts 42 moves up and down, and the yoke member 41 is connected to the yoke member 41 via the second support shaft 44. The connected annular member 43 moves up and down, and further, a pair of upper and lower needle bar holders 52 and 53 fixed to the needle bar 8 through a pair of upper and lower washer members 51 move up and down. 8 is driven up and down over a predetermined stroke.

  By the way, when the needle bar 8 is driven to swing by the needle swing mechanism 60 while moving up and down by the needle bar vertical movement mechanism 30 as described above, the needle bar 8 is supported by the support plate 9 as shown in FIG. The upper end is swung as a swing fulcrum P. At this time, since the rocking gap S is provided inside the annular member 43, the needle bar 8 can be moved in the annular member 43 both forward, backward, left and right by the rocking gap S.

  Moreover, since the washer members 51 on both the upper and lower sides are slidable to the annular member 43 from the state before the swinging shown in FIG. Can swing back and forth and right and left inside the annular member 43 without any support.

  Of course, this is a case where the needle bar 8 is rotated around its axis by the aforementioned rotation mechanism 15 (needle bar rotation mechanism 15A), and the swinging direction of the needle bar 8 changes over 360 °. However, since the needle bar 8 does not come into contact with the annular member 43, it is possible to execute the eyelet stitching with the sewing needle 7. Therefore, since no bending force as described in the prior art acts on the needle bar 8, no frictional heat is generated in any drive part of the needle swing mechanism 60, and durability is improved. Can do. In addition, the dimensional accuracy of the vertical movement stroke and needle swing amount of the needle bar 8 can be increased.

  The pair of upper and lower needle bar holders 52 and 53 are arranged in contact with the upper and lower surfaces of the pair of upper and lower washer members 51 slidably provided on the upper and lower surfaces of the annular member 43. If the slidability of the washer member 51 formed on the body is enhanced, the frictional resistance between the pair of upper and lower washer members 51 and the annular member 43 can be greatly reduced, and the heat generation action can be suppressed, and the annular shape of the needle bar 8 can be suppressed. The swinging motion with respect to the member 43 can be smoothed.

  Further, the vertical motion transmission mechanism 40 has guided pieces 45 and 46 mounted on the needle bar crank 35 and guide grooves 47a and 48a for guiding the guided pieces 45 and 46 so as to be movable only in the vertical direction. Since the guide mechanism 50 is provided with the guide grooves 47a and 48a formed in the machine frame F of the electronic eyelet sewing machine 1, the guided piece 45 mounted on the needle bar crank 35 by the guide mechanism 50 is provided. , 46 can be guided so as to move only in the vertical direction, the stability of the vertical movement of the annular member 43, that is, the stability of the vertical movement of the needle bar 8 can be enhanced.

  Further, the vertical motion transmission mechanism 40 further includes a yoke member 41 rotatably supported by the needle bar crank 35 via a horizontal first support shaft 42 orthogonal to the axis of the needle bar 8, and an annular member. Since the second support shaft 44 that rotatably supports the shaft 43 on the yoke member 41 and the horizontal second support shaft 44 orthogonal to the first support shaft 42 and the axis of the needle bar 8 is provided, the yoke The member 41 is rotatably supported by the needle bar crank 35 via the first support shaft 42, and the annular member 43 is rotatably supported by the yoke member 41 via the second support shaft 44.

  That is, since the annular member 43 is supported by the needle bar crank 35 as a universal joint by the first support shaft 42 and the second support, even if the needle bar 8 changes from a horizontal posture to an inclined posture when swinging, the annular member 43 is annular. The member 43 can reliably absorb the inclination of the washer member 51 by supporting the needle bar crank 35 like a universal joint, and the needle bar 8 can move up and down and swing.

  Further, since the guide mechanism 50 includes a pair of guided pieces 45 and 46 and a pair of guide grooves 47a and 48a for guiding the pair of guided pieces 45 and 46, the pair of guided pieces. The stability of the vertical movement of the annular member 43 and the vertical movement of the needle bar 8 can be remarkably enhanced by the pieces 45 and 46 and the guide grooves 47a and 48a.

  Next, a modified embodiment in which the embodiment is partially modified will be described.

1 ] A pair of upper and lower needle bar holders 52 and 53 are configured to be larger than the horizontal area of the annular member 43 without providing the upper and lower pair of washer members 51 separately or integrally with the needle bar holders 52 and 53. Then, the needle bar holders 52 and 53 may be fixed to the needle bar 8 so as to directly contact the annular member 43 so as to be slidable.

2 ] As shown in FIG. 14 , the guided piece 46A provided on the front side among the pair of front and back guided pieces 45, 46 is attached to the left side support portion 41c of the yoke member 41, and is U-shaped in plan view. It may be supported by a vertically long guide rail member 76. Also in this case, the guided pieces 45 and 46A mounted on the yoke member 41 can be guided by the guide mechanism 50A so as to move only in the vertical direction, and this corresponds to the thickness of the piece guide plate 48 provided on the front side. Thus, the front-rear direction dimension of the electronic eyelet hole sewing machine 1 can be reduced.

3 ] As shown in FIG. 15 , of the pair of front and rear guided pieces 45, 46, the guided piece 46B provided on the front side is mounted on the side portion of the annular member 43 via the second support shaft 44. Alternatively, it may be supported by a vertically long guide rail member 76 in a U shape in plan view. Also in this case, the guided piece 45 attached to the yoke member 41 and the guided piece 46B attached to the annular member 43 can be guided by the guide mechanism 50B so as to move only in the vertical direction, and are provided on the front side. Corresponding to the thickness of the frame guide plate 48, the longitudinal dimension of the electronic eyelet hole sewing machine 1 can be reduced.

4 This invention is not limited to the embodiment described above, Oh lever in the art, without departing from the scope of the present invention, be carried out by adding various modifications to the embodiments Therefore, the present invention includes those modifications.

1 is a perspective view of an electronic eyelet hole sewing machine according to an embodiment of the present invention. 1 is a side view of an electronic eyelet hole sewing machine according to an embodiment of the present invention. It is a perspective view of a rotation mechanism and a looper mechanism. It is a perspective view of the internal mechanism which has in an arm part. It is a side view of the internal mechanism which has in an arm part. It is a top view of the internal mechanism which has in an arm part. It is a front view of the internal mechanism which has in an arm part. It is the HH line vertical side view of FIG. FIG. 7 is a longitudinal rear view taken along the line II in FIG. 6. 5J is a cross-sectional view taken along the line JJ. It is a disassembled perspective view of a needle swing main-body part. FIG. 8L is a partial plan view across the line L-L. It is a figure equivalent to FIG. 12-1 at the time of a needle swing. It is a schematic diagram explaining the needle swing state of a needle bar. FIG. 11 is a diagram corresponding to FIG. 10 according to a modified embodiment. FIG. 11 is a diagram corresponding to FIG. 10 according to a modified embodiment. It is a schematic diagram explaining the needle swing state of the needle bar which concerns on the prior art.

DESCRIPTION OF SYMBOLS 1 Electronic eyelet hole sewing machine 7 Sewing needle 8 Needle bar 11 Looper base 15A Needle bar rotation mechanism 15B Looper base rotation mechanism 30 Needle bar vertical movement mechanism 31 Main shaft 34 Upper shaft crank 35 Needle bar crank 35a Crank body part 35c Overhang support part 40 vertical motion transmission mechanism 41 yoke member 42 first support shaft 43 annular member 44 second support shaft 45 rear guided piece 46 front guided piece 47 rear piece guide plate 47a guide groove 48 front piece guide plate 48a guide groove 50 Guide mechanism 50A Guide mechanism 50B Guide mechanism 51 Washer member 51A Sliding member 52 Needle bar holder 53 Needle bar holder 60 Needle swing mechanism S Swing gap

Claims (6)

A needle bar to which a sewing needle is attached, a needle bar up-and-down moving mechanism that moves the needle bar up and down, a needle swinging mechanism that swings the needle bar, and a needle bar that can be rotated about its axis In an eyelet-operated sewing machine comprising a mechanism and a looper base rotation mechanism that can rotate a looper base that supports the looper in synchronization with the rotation of the needle bar .
The needle bar vertical movement mechanism has a needle bar crank linked to the main shaft of the sewing machine, and a vertical movement transmission mechanism linked to the needle bar crank.
The vertical motion transmission mechanism is
An annular member externally fitted to the needle bar with a swinging clearance and operatively connected to the needle bar crank;
A pair of upper and lower needle bar holding members that are externally fitted to the needle bar and fixed to the needle bar and disposed on both upper and lower sides of the annular member, and are slidably provided on both upper and lower surfaces of the annular member. A pair of upper and lower needle bar holding members disposed in contact with both upper and lower surfaces of the pair of upper and lower washers;
An eye-catching sewing machine characterized by comprising The vertical motion transmission mechanism is a guide piece mounted on the needle bar crank and a guide groove that guides the guide piece so that the guide piece can move only in the vertical direction, and is formed in the machine frame of the sewing machine. The eyelet sewing machine according to claim 1, further comprising a guide mechanism including a guide groove . The vertical motion transmission mechanism is a guide piece mounted on the annular member, and a guide groove that guides the guide piece so that the guide piece can move only in the vertical direction, and is formed in the machine frame of the sewing machine. The eyelet sewing machine according to claim 1 , further comprising a guide mechanism including a guide groove . The vertical motion transmission mechanism further includes:
A yoke member rotatably supported by the needle bar crank via a horizontal first support shaft orthogonal to the axis of the needle bar;
A second support shaft that rotatably supports the annular member on the yoke member, wherein the needle shaft includes a shaft center of the needle bar and a horizontal second support shaft orthogonal to the first support shaft. The eyelet-punching sewing machine according to any one of claims 1 to 3 . The vertical motion transmission mechanism is a guide piece mounted on the yoke member and a guide groove that guides the guide piece so that the guide piece can move only in the vertical direction, and is formed in the machine frame of the sewing machine. The eyelet sewing machine according to claim 4 , further comprising a guide mechanism including a guide groove. 6. The eyelet according to claim 2 , wherein the guide mechanism has a pair of guided pieces and a pair of guide grooves for guiding the pair of guided pieces. A hole sewing machine.