JP4747742B2 - Sewing machine needle bar drive device and sewing machine - Google Patents

Description

  The present invention relates to a needle bar drive device having a crank mechanism that converts rotational movement of a main shaft of a sewing machine into vertical reciprocation of a needle bar.

  2. Description of the Related Art Conventionally, a sewing machine is provided with a sewing machine motor, a main shaft (upper shaft) that is rotationally driven by the sewing motor, and a crank mechanism that converts the rotational motion of the main shaft into a vertical reciprocating motion of the needle bar. The crank mechanism includes a main shaft crank fixed to the main shaft, and a needle bar crank having an upper end portion rotatably connected to the main shaft crank and a lower end portion rotatably connected to a needle bar support member that supports the needle bar. A guide mechanism for guiding the lower end portion of the needle bar crank in the vertical direction is provided.

  For example, in the sewing machine disclosed in Patent Document 1, a pair of guide members are disposed on both sides of the needle bar crank in the direction parallel to the main shaft, and guide grooves that are long in the vertical direction are formed on the guide members. A pair of square pieces are pivotally attached to the lower end of the needle bar crank. The guide groove of the guide member on the needle bar side of the pair of guide members is formed in a slit, and the shaft that pivotally supports the square bar on the needle bar side of the pair of square pieces passes through the slit, and the shaft end portion thereof Another square piece is pivotally attached, and this square piece is engaged with a horizontally long guide groove of a guide member fixed to the needle bar.

  In addition, the applicant of the present application has put to practical use a buttonhole sewing machine that forms a stitch on the edge portion of the buttonhole on the work cloth, which is provided with the spindle having the same function, the crank mechanism, and the guide mechanism. In a boring machine, the fork-shaped lower end of the needle bar crank is rotatably connected to both ends of a needle bar support member that supports the needle bar, and the needle bar and the needle bar support member are connected to the main shaft via the needle bar crank. Supported by the crank in a cantilever manner, the guide mechanism is configured to guide the needle bar support member (needle bar) in the vertical direction together with the lower end of the needle bar crank.

This guide mechanism employs a mechanism having a flange that is in sliding contact with the needle bar side end surface of the guide member in a state where the square piece is engaged with the guide groove of the guide member.
JP 2003-24664 A

  Like the buttonhole sewing machine, in which the needle bar and the needle bar support member are supported in a cantilever manner by the main shaft crank via the needle bar crank, the crank mechanism is activated and the needle bar and the needle bar support member When the elevating body such as the needle bar crank is moved up and down, a moment acts on the elevating body around the connecting portion between the main shaft crank and the needle bar crank. In particular, when the lifting body is moved up and down at high speed, or when the needle bar support member is heavy, the moment increases, so that the lifting mechanism is not rattled by this moment. It is necessary to improve the guideability for guiding the lower end portion of the needle bar crank in the vertical direction.

  However, in the case where the square piece is engaged with the guide groove of the guide member as in the guide mechanism and has a flange portion that is in sliding contact with the needle bar side end surface of the guide member, the flange portion of the square piece and the guide member If there is a gap between the needle bar side end surface, the moment increases the load acting on the connecting part (bearing) of the main shaft crank and needle bar crank, and the connecting part is easily worn and damaged. As described above, rattling occurs in the elevating body, and the square piece does not smoothly engage with the guide groove of the guide member, so that the square piece and the guide member may be worn or damaged.

Conventionally, in the crank mechanism and the guide mechanism, in consideration of manufacturing errors and assembly errors, a slight gap is allowed between the collar portion of the square piece and the end surface on the needle bar side of the guide member. However, it is not desirable because the above problems occur. To solve this problem, it is necessary to increase the production accuracy and assembly accuracy of the crank mechanism, guide mechanism, etc. It is also disadvantageous in terms of cost. Alternatively, a crank mechanism, there is a limit to solve the challenges to improve the manufacturing precision and assembly precision of such guide mechanisms.

  It is an object of the present invention to make it possible to adjust and fix the position of the needle bar crank in the direction parallel to the main shaft with respect to the main shaft crank by the needle bar crank position adjusting mechanism, and to require manufacturing accuracy and assembly accuracy of the crank mechanism, guide mechanism, etc. Without increasing the above, the guide mechanism can easily and reliably improve the guide performance of guiding the other end of the needle bar crank in the vertical direction, and the durability of the crank mechanism and the guide mechanism can be improved. A needle bar drive is provided.

2. The needle bar drive device for a sewing machine according to claim 1, wherein the needle bar drive device has a crank mechanism for converting the rotational motion of the main shaft of the sewing machine into the vertical reciprocating motion of the needle bar, wherein the crank mechanism is a main shaft crank fixed to the main shaft. And an end parallel to the main shaft crank and a shaft parallel to the main shaft and eccentrically connected to the main shaft crank via a crank shaft member, and the other end is a shaft parallel to the main shaft to the needle bar support member supporting the needle bar A needle bar crank rotatably connected around the guide bar, and a guide mechanism for guiding the other end of the needle bar crank in the vertical direction. The guide mechanism has a vertically long guide groove fixed to the machine frame. A guide mechanism having a guide member having a guide piece pivotally attached to the other end of the needle bar crank and engaged with the guide groove, and a position of the needle bar crank in a direction parallel to the main axis with respect to the main shaft crank. Adjustment And a fixable needle bar crank position adjusting mechanism in capacity, the other end portion with one end portion of the crank shaft member is inserted and fixed to the shaft hole formed in the main shaft crank pivotally to the needle bar crank The needle bar crank position adjusting mechanism includes a screw member that fixes a crankshaft member inserted in a shaft hole of the main shaft crank to the main shaft crank so as to be unlockable, and the guide member is arranged in a direction parallel to the main shaft. The needle bar support member is disposed on the opposite side of the needle bar crank from the needle bar, and the needle bar support member includes a yoke member rotatably supported by the needle bar crank via a pair of support shafts, The guided piece has a flange that is in sliding contact with the needle bar side end surface of the guide member in a state of being engaged with the guide groove, and is supported by the pair of support shafts with the needle bar interposed therebetween. .

  In this needle bar drive device, the main shaft crank of the crank mechanism is fixed to the main shaft, and one end of the needle bar crank is rotatably connected to the main shaft crank via a crank shaft member around an axis parallel to the main shaft and eccentric, The other end of the needle bar crank is connected to a needle bar support member that supports the needle bar so as to be rotatable about an axis parallel to the main shaft. When the main shaft is driven to rotate, the driving force is transmitted from the main shaft to the needle bar support member via the main shaft crank, crank shaft member and needle bar crank of the crank mechanism, and the needle bar moves up and down together with the needle bar support member. It is driven back and forth.

  The other end of the needle bar crank is guided in the vertical direction by the guide mechanism, and the needle bar support member and the needle bar are guided in the vertical direction by the guide mechanism. Then, the needle bar crank position adjusting mechanism adjusts and fixes the position of the needle bar crank in the direction parallel to the main shaft relative to the main shaft crank, so that the needle bar crank and the guide mechanism are in an appropriate positional relationship, and the needle bar crank is adjusted by the guide mechanism. The guide property of guiding the other end of the needle bar in the vertical direction is enhanced, and the load acting on the connecting part (bearing) for rotatably connecting the needle bar crank to the main shaft crank is reduced, the needle bar crank, the needle bar support member, The needle bar is moved up and down smoothly.

Here, the following configuration can be adopted in the invention of claim 1 .

The machine frame before Symbol sewing machine, a tool insertion hole for inserting a tool for operating the screw member from the outside is formed (claim 2). The sewing machine is a buttonholing machine which forms stitches on the edge portion of the buttonhole of the fabric (claim 3).
According to a fourth aspect of the present invention, there is provided a sewing machine comprising the needle bar drive device for a sewing machine according to any one of the first to third aspects.

  According to the needle bar drive device of the sewing machine according to claim 1, by providing the needle bar crank position adjustment mechanism, the needle bar, without increasing the manufacturing accuracy and assembly accuracy of the crank mechanism, the guide mechanism, etc. more than necessary. With the needle bar support member, crank mechanism, and guide mechanism assembled, the position of the needle bar crank in the direction parallel to the main shaft relative to the main shaft crank can be adjusted and fixed. As a simple positional relationship, the guide mechanism for guiding the other end portion of the needle bar crank in the vertical direction by the guide mechanism can be easily and reliably improved.

  Therefore, even when the needle bar and the needle bar support member are supported in a cantilever manner by the main shaft crank via the needle bar crank when the crank mechanism is operated, the needle bar crank, the needle bar support member, and the needle bar Even when the needle bar support member or the like is heavy when it is moved up and down at high speed, the guide mechanism functions reliably and acts on a connecting portion (bearing) that rotatably connects the needle bar crank to the main shaft crank. The load can be reduced, and the needle bar crank, needle bar support member, and needle bar can be smoothly moved up and down, and the durability of the crank mechanism and the guide mechanism can be increased.

One end portion of the crank shaft member and the other end portion rotatably connected to the needle bar crank is inserted fixed to the shaft hole formed in the main shaft crank, the needle bar crank position adjusting mechanism, the main shaft crank shaft hole Since there is a screw member for fixing the crankshaft member inserted in the main shaft crank so as to be unlockable, the structure of the needle bar crank position adjusting mechanism can be simplified, and the position of the needle bar crank in the direction parallel to the main shaft relative to the main shaft crank can be It can be fixed easily and reliably.

Guide mechanism includes a guide member having a long guide groove vertically fixed to the sewing machine frame, because it has a guided piece that is engaged pivotally mounted and the guide groove to the other end of the needle bar crank The guide mechanism can be made simple and the other end of the needle bar crank can be reliably guided in the vertical direction.

Guided piece, so supported on a pair of support shafts across the perforated to and needle bar a flange portion slidably contacting the needle bar side end face of the guide member in engagement with the guide groove, adjust the needle bar crank position By adjusting the position by the mechanism, the collar portion of the guided piece can be reliably slidably brought into contact with the end surface of the guide member on the needle bar side, thereby improving the guide performance by the guide mechanism, the durability of the crank mechanism, and the guide mechanism.

A draft internal member, since the disposed opposite the needle bar relative to the needle bar crank in the spindle direction parallel, that Ki out to ensure the needle bar support member, the space of the needle bar or the like.

According to the needle bar drive device of the sewing machine according to claim 2 , since the tool insertion hole for inserting the tool for operating the screw member from the outside is formed in the machine frame of the sewing machine, the screw member is operated from the outside of the sewing machine. Can be loosened and tightened easily.

According to the needle bar driving device of the sewing machine of claim 3, since the sewing machine is a buttonhole sewing machine that forms a stitch at the edge of the buttonhole of the work cloth, the needle bar is provided by the guide mechanism in the buttonhole sewing machine. The guide performance for guiding the other end of the crank in the vertical direction can be easily and reliably increased, and the durability of the crank mechanism and the guide mechanism can be enhanced.
According to the sewing machine of the fourth aspect , the same effects as in the first to third aspects are obtained.

The needle bar drive device for a sewing machine according to the present embodiment is applied to a buttonhole sewing machine (electronic eyelet sewing machine) that forms a seam at the edge of the buttonhole of the work cloth, and the rotational movement of the spindle is moved up and down the needle bar. The crank mechanism that converts to reciprocating motion includes a main shaft crank that is fixed to the main shaft, and one end portion of the crank mechanism that is rotatably connected to the main shaft crank around a shaft that is parallel to the main shaft and eccentric, and the other end portion. there and a needle bar crank rotatably connected to the main shaft and an axis parallel to the needle bar support member that supports the needle bar, a guide mechanism for guiding the other end of the needle bar crank vertically A guide mechanism having a guide member having a vertically long guide groove fixed to the sewing machine frame, a guided piece pivotally attached to the other end of the needle bar crank and engaged with the guide groove, and a main shaft Needle bar club against crank The position of the main shaft parallel direction click and a adjustable and fixable needle bar crank position adjusting mechanism, the other end portion with one end portion of the crank shaft member is inserted and fixed to the shaft hole formed in the main shaft crank The needle bar crank position adjusting mechanism has a screw member that fixes the crankshaft member inserted into the shaft hole of the main shaft crank to the main shaft crank so as to be unreleasable, and is a guide member. Is disposed on the opposite side of the needle bar crank from the needle bar crank in the direction parallel to the main axis, and the needle bar support member is a yoke member rotatably supported by the needle bar crank via a pair of support shafts. The guided piece has a flange that is in sliding contact with the needle bar side end surface of the guide member in a state of being engaged with the guide groove, and is supported by a pair of support shafts with the needle bar interposed therebetween .

  As shown in FIGS. 1 and 2, an electronic eyelet hole sewing machine 1 is configured by integrally including a bed portion 2 having a substantially rectangular box shape and an arm portion 3 that extends forward from the upper side of the rear portion. It is placed on the table 4. On the upper side of the sewing machine table 4, there is provided an operation panel 5 for instructing various operations such as selectively selecting a plurality of types of eyelet stitches for use in sewing. Further, a control device 6 composed of a microcomputer for controlling the operation of each mechanism of the electronic eyelet sewing machine 1 is provided below the sewing table 4.

  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 3, and this needle bar 8 is moved up and down by a needle bar vertical movement mechanism 30 (shown in FIG. 4). Then, it is swung in the horizontal direction by a needle swing mechanism 60 (shown in FIG. 4).

  As shown in FIG. 3, the bed part 2 is synchronously driven with a looper mechanism 10 having a pair of left and right loopers (not shown) so as to face the needle bar 8 and the vertical movement and swing of the needle bar 8. A sewing machine motor (not shown) serving as a drive source for the sewing mechanism to be operated and a looper base 11 having a looper mechanism 10 are provided. The looper base 11 can be integrally rotated around a vertical axis by a rotation mechanism 15.

  Here, an upper thread supplied from a thread supply source (not shown) is inserted into the sewing needle 7, a lower thread is inserted into the tip of the left looper, and the right looper lowers the upper thread while weaving the upper thread loop. Are entangled to form a loop coupling portion.

  The rotation mechanism 15 includes a needle bar rotation mechanism 15A capable of rotating the needle bar 8 around its axis by a θ-direction drive motor 21 described later, and a looper base 11 connected to the needle bar 8 by a θ-direction drive motor 21 described later. And a looper base rotation mechanism 15B that can be rotated in synchronism with the rotation. Accordingly, the needle bar 8 and the looper base 11 are integrally rotated around the vertical axis in the horizontal plane by the θ-direction drive motor 21 and the gear mechanism provided in the bed portion 2, respectively.

Next, the needle bar turning mechanism 15 and the looper base turning mechanism 15B will be described.
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 24. Yes.

  The needle bar rotation mechanism 15A includes a needle bar block 19, a timing belt 20, a race rotation shaft 16, a pulley 17, a pulley 18, a timing belt 24, a drive pulley 22, a θ-direction drive motor 21, and the like. The looper base rotation mechanism 15B includes the driven gear 23 of the looper base 11, a timing belt 24, a θ-direction drive motor 21, and the like.

  As shown in FIG. 2, a bed 25 has a scalpel 25 which is fixedly disposed on the rear side of the looper base 11 to form a eyelet hole (button hole) and is attached to a mounting base (not shown). A punching hammer 26 that is attached to and detached from the knife 25 from above is provided in the arm portion 3 so as to be movable 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. With 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 portion of the bed portion 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.

  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, a needle bar vertical movement mechanism 30 (needle bar drive device) 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 with reference to FIGS. To do.

  The main shaft 31 is rotatably supported by the machine frame F at a plurality of locations. A timing belt 33 is mounted on a pulley 32 fixed to the rear end of the main shaft 31 and a driving pulley (not shown) fixed to a motor shaft of the sewing machine motor. The main shaft 31 is passed through the timing belt 33 by the sewing motor. Driven by rotation.

  The needle bar vertical movement mechanism 30 includes a crank mechanism 34 that converts the rotational motion of the main shaft 31 into the vertical reciprocation of the needle bar 8, and a vertical motion transmission mechanism 40 that is linked to the crank mechanism 34. The crank mechanism 34 has a main shaft crank 35 and a needle bar crank 36. The main shaft crank 35 is fitted into the front end portion of the main shaft 31 and fixed by a screw member 35a, and the rear end portion of the main shaft crank 35 is rotatably supported by the machine frame F via a bearing 35b.

  The needle bar crank 36 is a vertically extending crank body 36a that is disposed in parallel to the spindle crank 35 on the front side of the spindle crank 35, and a plane that extends integrally forward from the lower end portion of the crank body 36a. The extension crank portion 36b has an L-shaped extension, and the extension support portion 36c at the front end of the extension crank portion 36b is formed in the left-right direction so as to be parallel to the crank body portion 36a with a predetermined distance therebetween. .

  The upper end portion of the crank body portion 36a, which is one end portion of the needle bar crank 36, is rotatably connected to the main shaft crank 35 via a crankshaft member 37 around an axis that is parallel to the main shaft 31 (front-rear direction) and eccentric. ing. The lower end portion of the crank body portion 36a, which is the other end portion of the needle bar crank 36, and the left end portion of the overhanging support portion 36c are connected to the yoke member 41 of the vertical motion transmission mechanism 40 via a pair of first support shafts 42. Are connected to be rotatable about an axis parallel to (in the front-rear direction).

  The crankshaft member 37 is integrally formed by slightly decentering the main shaft side shaft portion 37a of the rear end side portion and the needle bar side shaft portion 37b of the front end side portion slightly eccentric with respect to the main shaft side shaft portion 37a. Formed. The main shaft side shaft portion 37 a is inserted and fixed in a shaft hole 35 c formed in the main shaft crank 35. The needle bar side shaft portion 37b is rotatably fitted and connected to the needle bar crank 36 via a bearing 37c, and the needle bar crank 36 is connected by a flange 37d provided at the front end portion of the needle bar side shaft portion 37b. The position in the front-rear direction with respect to the needle bar side shaft portion 37b is fixed by being prevented from coming off.

  The crank mechanism 34 is provided with a needle bar crank position adjusting mechanism 38 that can adjust and fix the position of the needle bar crank 36 in the main shaft parallel direction (front-rear direction) with respect to the main shaft crank 35. The needle bar crank position adjusting mechanism 38 is configured so that the position can be adjusted by moving the main shaft side shaft portion 37a in the axial direction with the main shaft side shaft portion 37a being inserted into the shaft hole 35c, and the main shaft side shaft portion 37a inserted into the shaft hole 35c. A plurality of (for example, three) screw members 39 are fixed to the main shaft crank 35 so as to be unlockable.

  A plurality of (for example, three) screw holes 35d that communicate with the shaft hole 35c and open to the outside are formed in the main shaft crank 35, and a screw member 39 is screwed into each of the screw holes 35d. On the other hand, a screw contact surface 37e that is long and flat in the front-rear direction is formed on the outer peripheral surface of the main shaft side shaft portion 37a. The tip end portion of the screw member 39 screwed into the screw hole 35d comes into contact with the screw contact surface 37e to press the main shaft side shaft portion 37a, and the main shaft side shaft portion 37a is fixed and integrated with the main shaft crank 35. The In the present embodiment, at least one screw contact surface 37e is formed, and the tip portions of the two screw members 39 are in contact with the screw contact surface 37e.

  Here, as shown in FIG. 8, a tool for inserting a tool (not shown) for operating the plurality of screw members 39 from the outside into the cover member 1 a (machine frame) of the electronic eyelet sewing machine 1. An insertion hole 1b is formed. A tool engaging portion (not shown) with which the tip end portion of the tool engages is formed at the head of each screw member 39. Specifically, the tool insertion hole 1b is formed in the cover member rear part located in the rear side of the crankshaft member 37 among the cover members 1a. However, since the spindle crank 35 rotates together with the spindle 31 and the screw member 39 also rotates, when the screw member 39 is operated with a tool from the outside, the spindle 31 is at a rotational position where the screw member 39 faces the tool insertion hole 1b. In this state, the main shaft crank 35 is stopped.

  The vertical motion transmission mechanism 40 includes a yoke member 41 rotatably supported by the needle bar crank 36 via a pair of first support shafts 42 in the front-rear direction, and a pair of left and right movement mechanisms 40 on the yoke member 41. An annular member 43 rotatably supported via a second support shaft 44 in the direction, a pair of guide mechanisms 50 for guiding the lower end portion of the needle bar crank 36 in the vertical direction, and upper and lower surfaces of the annular member 43 And a pair of upper and lower needle bar clamps 52 and 53 fixed to the needle bar 8. The yoke member 41, the annular member 43, etc. correspond to the needle bar support member.

  Each guide mechanism 50 has guided pieces 45 and 46 supported by the lower end portion of the needle bar crank 36, and guide grooves 47a and 48a that are long in the vertical direction in which the guided pieces 45 and 46 are slidably engaged. Plate-shaped piece guide plates 47 and 48 (corresponding to guide members) are provided. The pair of piece guide plates 47 and 48 are disposed so as to be parallel to each other in a vertical posture on both the front and rear sides across the yoke member 41, the annular member 43, the pair of washer members 51 and the like, and are fixed to the machine frame F. In particular, the rear piece guide plate 47 is disposed on the opposite side of the needle bar 8 with respect to the needle bar crank 36 in the front-rear direction.

  The pair of guided pieces 45 and 46 are respectively supported by the pair of first support shafts 42 and along the guide grooves 47a and 48a of the piece guide plates 47 and 48 while being engaged with the guide grooves 47a and 48a. It has collar parts 45a and 46a which are in sliding contact with the needle bar side end face. The flange portions 45a and 46a may be formed so as to protrude over the entire circumference with respect to the portions of the guided pieces 45 and 46 that engage with the guide grooves 47a and 48a. It is formed to project in the direction.

  The pair of first support shafts 42 are fixedly secured by fixing pins 56 and 57 so that the center portions thereof are fitted into the crank body 36 a and the overhanging support 36 c of the needle bar crank 36. Further, the rear and front support portions 41a of the yoke member 41 are fitted and supported at the needle bar side end of the first support shaft 42, and the guided pieces 45 and 46 are externally attached to the end opposite to the needle bar. It is fitted and supported. On the other hand, the pair of second support shafts 44 are fitted to the left and right support portions 41c and 41d of the yoke member 41 at the ends opposite to the needle bar 8, and are fixed by fixing pins. Further, the left and right support portions 43 a and 43 b of the annular member 43 are externally supported by the needle bar side portion of the second support shaft 44.

  That is, the annular member 43 is universally supported by the needle bar crank 36 via the yoke member 41 by a pair of front and rear first support shafts 42 and a pair of left and right second support shafts 44. The opening of the annular member 43 is larger than the diameter of the needle bar 8, and the needle bar 8 arranged in the vertical direction is inserted in the opening of the annular member 43 with a rocking clearance S secured.

  The needle bar 8 is supported by a thin plate-like circular support plate 9 made of an elastic material whose upper end is fixed to the machine frame F so as to be movable up and down and swingable, and is inserted through the opening of the annular member 43. The sewing needle 7 is attached to the lower end portion of the arm portion 3 that extends downward and faces the lower side of the arm portion 3 through a needle swing mechanism 60 described later.

  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.

  The needle bar 8 is fixed with an upper needle bar holder 52 disposed in contact with the upper surface of the upper washer member 51, and a lower needle bar disposed in contact with the lower surface of the lower washer member 51. The hugging 53 is fixed. When the crank body portion 36a and the overhanging support portion 36c of the needle bar crank 36 are moved up and down synchronously via the main shaft crank 35 by the rotation of the main shaft 31, a pair of front and rear first support shafts 42 and a front and rear pair Since the yoke member 41 moves up and down through the engagement of the guided pieces 45 and 46 and the guide grooves 47a and 48a, the annular member 43 moves up and down by a predetermined stroke 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-mentioned universal joint is supported on the bar crank 36, the inclination 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 with reference to FIGS. 4, 5, and 9.
The needle swing mechanism 60 includes a needle swing drive unit 61 and a needle swing main body 62. The needle swing drive unit 61 will be described. An bevel gear 66 that engages with a bevel gear 65 fixed to the main shaft 31 is fixed to a left and right rotating shaft 67 and is attached to the rotating shaft 67 with an eccentric cam plate ( A bifurcated portion 68a formed in a bifurcated shape of the swinging member 68 is engaged with the unillustrated). The swing member 68 is rotatably supported by a rotary shaft 69 fixed to the machine frame F at the lower end portion.

  The rear end portion of the connecting rod 70 is connected to one of the bifurcated portions 68 a of the swing member 68. A curved notch hole 72b formed in the first arm portion 72a of the swing adjustment plate 72 whose front end portion of the connecting rod 70 is swingable to the left and right support shaft 71 in the vicinity of the needle bar 8. And 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 adjustment plate 72 is moved away from the support shaft 71, the swing amount of the second arm portion 72c 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. 9, a large-diameter penetrating hole formed on the lower surface of the head portion of the arm portion 3 with the needle bar turning bracket 80 having a circular shape in plan view being prevented from coming off. A hole (not shown) is rotatably fitted. 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 protrusion 84a that slidably engages with the oblique groove 83a protrudes from the tip of the guide pin 84. A bottomed hole portion 84b is formed in the axial direction at the other end portion of the guide pin 84, and a compression spring 85 is elastically accommodated in the bottomed hole portion 84b.

  Then, when the leg portion 80c is clamped by the trunnion-like presser plate 86, the opposing tongue piece 86a in the presser plate 86 correspondingly closes the storage hole 80d. Accordingly, the guide pins 84 accommodated in the respective accommodation holes 80d are urged inward by the compression springs 85 so that the needle swinging projections 84a are slidably faced in the oblique grooves 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.

The operation and effect of the needle bar vertical movement mechanism 30 of the electronic eyelet hole sewing machine 1 will be described.
When the sewing machine motor is driven and the main shaft 31 is rotationally driven, the driving force is transmitted from the main shaft 31 to the yoke member 41 via the main shaft crank 35 of the crank mechanism 34, the crank shaft member 37, and the needle bar crank 36. The The needle bar 8 is reciprocated up and down together with the yoke member 41, the annular member 43, and the like. In this case, the lower end portion of the needle bar crank 36 is guided in the vertical direction by the guide mechanism 50. Further, the guide member 50 guides the yoke member 41, the annular member 43, and the needle bar 8 in the vertical direction.

Incidentally, since the needle bar 8, the annular member 43, the yoke member 41 and the like are cantilevered by the main shaft crank 35 via the needle bar crank 36, the crank mechanism 34 is operated and the needle bar 8 and the annular member are operated. 43, the yoke member 41, the needle bar crank 36 and the like are moved up and down, a moment acts on the lift body around the connecting portion (bearing 37c) between the main shaft crank 35 and the needle bar crank 36.
In particular, when the elevating body is moved up and down at high speed, or when the elevating body is heavy, the moment increases. Therefore, in order to prevent the elevating body from rattling by this moment, the guide mechanism 50 Therefore, it is necessary to improve the guide property for guiding the lower end portion of the needle bar crank 36 in the vertical direction.

  However, as shown in FIG. 11, particularly in the rear guide mechanism 50, if a gap is generated between the flange 45a of the guided piece 45 and the needle bar side end surface of the piece guide plate 47, the main shaft is caused by the moment. The load acting on the bearing 37c at the connecting portion between the crank 35 and the needle bar crank 36 is increased, and the connecting portion is easily worn and damaged. Further, rattling occurs in the elevating body, and the guided piece 45 does not smoothly engage with the guide groove 47a of the piece guide plate 47, and the guided piece 45 and the piece guide plate 47 may be worn or damaged. Occurs.

  As described above, in order to solve this problem, the production accuracy and assembly accuracy of the crank mechanism 34, the guide mechanism 50, and the like may be increased. However, the production load and assembly load increase, which is disadvantageous in terms of production cost. Alternatively, there is a limit to eliminate the above-mentioned title by increasing the manufacturing accuracy and assembly accuracy of the crank mechanism 34, the guide mechanism 50, and the like.

  Therefore, when assembling the electronic eyelet hole sewing machine 1 or after using the electronic eyehole hole sewing machine 1 for a long period of time, as shown in FIG. If there is a gap between the end face of the needle guide plate 47 and the needle bar side of the piece guide plate 47, the needle bar crank position adjusting mechanism 38 adjusts the position of the needle bar crank 36 in the main shaft parallel direction with respect to the main shaft crank 35. Can be fixed.

  In this case, in a state where the plurality of screw members 39 are loosened, the needle bar crank 36 is pushed rearward, and the needle bar crank 36 and the crankshaft member 37 are moved backward relative to the main shaft crank 35. Then, as shown in FIG. 10, the collar portion 45a of the guided piece 45 is brought into contact with the needle bar side end surface of the piece guide plate 47, and in this state, the plurality of screw members 39 are tightened to complete the adjustment work.

  As described above, by providing the needle bar crank position adjusting mechanism 38, the needle bar 8, the yoke member 41, the annular shape can be obtained without increasing the manufacturing accuracy and assembly accuracy of the crank mechanism 34, the guide mechanism 50, etc. more than necessary. With the member 43, the crank mechanism 34, and the guide mechanism 50 assembled, the position of the needle bar crank 36 in the direction parallel to the main shaft relative to the main shaft crank 35 can be adjusted and fixed. As a result, the guide bar 50 and the guide mechanism 50 can be appropriately positioned so that the guide mechanism 50 can easily and reliably improve the guide property for guiding the lower end of the needle bar crank 36 in the vertical direction.

  Therefore, when the crank mechanism 34 is operated, even if the needle bar 8, the annular member 43, the yoke member 41, etc. are supported in a cantilever manner on the main shaft crank 35 via the needle bar crank 36, these lifting bodies are further Even when the elevator body is moved up and down at high speed and the lifting body is heavy, the guide mechanism 50 functions reliably and acts on the connecting portion (bearing 37c) that rotatably connects the needle bar crank 36 to the main shaft crank 35. Thus, the lifting body can be moved up and down smoothly, and the durability of the crank mechanism 34 and the guide mechanism 50 can be improved.

  The main shaft side shaft portion 37a of one end side portion of the crank shaft member 37 is inserted and fixed in a shaft hole 35c formed in the main shaft crank 35, and the needle bar side shaft portion 37b of the other end portion is turnable to the needle bar crank 36. The needle bar crank position adjusting mechanism 38 is coupled and has a plurality of screw members 39 for fixing the main shaft side shaft portion 37a inserted into the shaft hole 35c to the main shaft crank 35 so as to be unreleasable. The structure of 38 can be simplified, and the position of the needle bar crank 36 in the direction parallel to the main shaft relative to the main shaft crank 35 can be easily and reliably adjusted and fixed.

  The guide mechanism 50 is pivotally attached to the lower end portion of the needle bar crank 36 and is engaged with the guide grooves 47a and 48a. Since the guided pieces 45 and 46 are combined, the guide mechanism 50 can be simply configured, and the lower end portion of the needle bar crank 36 can be reliably guided in the vertical direction.

  Since the guided pieces 45 and 46 have flange portions 45a and 46a that are in sliding contact with the needle bar side end surfaces of the piece guide plates 47 and 48 while being engaged with the guide grooves 47a and 48a, the needle bar crank position adjusting mechanism 38 By adjusting the position, in the guide mechanism 50 on the rear side, the collar portion 45a of the guided piece 45 is securely slidably brought into contact with the end surface on the needle bar side of the piece guide plate 47 so that the guide performance by the guide mechanism 50, the crank mechanism 34, the guide The durability of the mechanism 50 can be increased.

  Since the piece guide plate 47 of the rear guide mechanism 50 is disposed on the side opposite to the needle bar 8 with respect to the needle bar crank 36 in the direction parallel to the main axis, a space for the yoke member 41, the annular member 43, etc. is ensured. I get out. Since the tool insertion hole 1b for inserting a tool for operating the screw member 39 from the outside is formed in the cover member 1a, the screw member 39 can be easily loosened by operating the cover member 1a from the outside. It can be tightened.

Next, a modified embodiment in which the embodiment is partially modified will be described.
1] Regarding the operation of the needle bar crank position adjusting mechanism 38, the needle bar crank 36 and the crankshaft member 37 are integrally moved forward with respect to the main shaft crank 35 in a state where the plurality of screw members 39 are loosened. In the front guide mechanism 50, the flange 46 a of the guided piece 46 may be brought into contact with the needle bar side end face of the piece guide plate 48.

2] The needle bar side shaft portion 37b of the crankshaft member 37 is inserted and fixed in a shaft hole formed in the needle bar crank 36, and the main shaft side shaft portion 37a is rotatably connected to the main shaft crank 35, so that the needle bar crank position The adjusting mechanism 38 may be configured to have a plurality of screw members that fix the needle bar side shaft portion inserted into the shaft hole of the needle bar crank to the needle bar crank 36 so as to be unreleasable.

3] The flange portions 45a and 46a of the guided pieces 45 and 46 are omitted, and the guided pieces 45 and 46 are engaged with the guide grooves 47a and 48a, and the leading ends of the guided pieces 45 and 46 are guided grooves 47a. , 48a so as to be in sliding contact with the back end face. In this case, in the needle bar crank position adjusting mechanism 38, the position of the needle bar crank 36 in the main shaft parallel direction with respect to the main shaft crank 35 is such that the tip of the guided piece 45 or 46 abuts on the back end surface of the guide groove 47a or 48a. Adjust to fix.

In addition, although the case where this invention was applied to the electronic eyelet hole sewing machine 1 was demonstrated, this invention is applicable to various industrial sewing machines, such as the lockstitch sewing machine provided with the needle bar vertical movement mechanism 30.
The present 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.

It is a perspective view of the whole apparatus containing an electronic eyelet hole sewing machine. It is a side view of an electronic eyelet-holed sewing machine. It is a perspective view of a rotation mechanism. It is a perspective view of the principal part inside an electronic eyelet hole sewing machine. It is a side view of the principal part inside an electronic eyelet hole sewing machine. It is a longitudinal cross-sectional view of the principal part containing a crank mechanism and a needle bar crank position adjustment mechanism. It is the VII-VII sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of an electronic eyelet hole sewing machine. It is a perspective view of a needle swing main-body part. It is a longitudinal cross-sectional view before adjustment of a needle bar crank position adjustment mechanism. It is a longitudinal cross-sectional view after adjustment of the needle bar crank position adjustment mechanism.

DESCRIPTION OF SYMBOLS 1 Electronic eyelet hole sewing machine 1a Cover member 1b Tool insertion hole 8 Needle bar 30 Needle bar vertical movement mechanism 31 Main shaft 34 Crank mechanism 35 Main shaft crank 35c Shaft hole 36 Needle bar crank 37 Crank shaft member 38 Needle bar crank position adjustment mechanism 39 Screw Member 41 yoke member 43 annular member 45 guided piece 45a collar 47 piece guide plate 47a guide groove 50 guide mechanism

Claims (4)

In the needle bar drive device having a crank mechanism for converting the rotational movement of the main shaft of the sewing machine into the vertical reciprocating movement of the needle bar,
The crank mechanism includes a main shaft crank fixed to the main shaft, one end portion rotatably connected to the main shaft crank around a shaft that is parallel to and eccentric from the main shaft, and the other end portion including a needle bar. A needle bar crank that is connected to a needle bar support member that supports the needle bar crank rotatably around an axis parallel to the main axis;
A guide mechanism for guiding the other end portion of the needle bar crank in the vertical direction, a guide member having a long guide groove fixed in the vertical direction on the sewing machine frame, and pivotally attached to the other end portion of the needle bar crank And a guide mechanism having a guided piece engaged with the guide groove ,
And a adjustable and fixable needle bar crank position adjusting mechanism of the position of the main shaft parallel of the needle bar crank with respect to the main shaft crank,
One end side portion of the crankshaft member is inserted and fixed in a shaft hole formed in the main shaft crank, and the other end portion is rotatably connected to the needle bar crank,
The needle bar crank position adjusting mechanism has a screw member that fixes a crankshaft member inserted into a shaft hole of the main shaft crank to the main shaft crank so as to be unfixed,
The guide member is disposed on the side opposite to the needle bar with respect to the needle bar crank in the direction parallel to the main shaft,
The needle bar support member has a yoke member rotatably supported by the needle bar crank via a pair of support shafts;
The guided piece has a flange that is in sliding contact with the needle bar side end surface of the guide member in a state of being engaged with the guide groove, and is supported by the pair of support shafts across the needle bar.
A needle bar drive device for a sewing machine characterized by the above. 2. The needle bar drive device for a sewing machine according to claim 1 , wherein a tool insertion hole for inserting a tool for operating the screw member from outside is formed in the machine frame of the sewing machine. 3. The needle bar drive device for a sewing machine according to claim 1, wherein the sewing machine is a buttonhole sewing machine that forms a stitch at an edge portion of a buttonhole of a work cloth . A sewing machine comprising the needle bar drive device for a sewing machine according to any one of claims 1 to 3.

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