JP2007296253A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine having a lockstitch-skipping mechanism. <P>SOLUTION: This sewing machine comprises a needle bar mechanism 2, a shuttle mechanism 5, and a lockstitch-skipping mechanism 6. The needle bar mechanism 2 includes a needle bar 7 that moves up and down and a lockstitch sewing needle 10 held at the lower end of the needle bar. The shuttle mechanism 5 includes a rotary hook 49 and an inner shuttle 48, which are structured to form lockstitches in synchronization with the up-and-down motion of the lockstitch sewing needle 10. The lockstitch-skipping mechanism 6 is designed to move between a position where the shuttle mechanism 5 gets closer to the lockstitch sewing needle 10 and a position where the shuttle mechanism is separated from the needle 10, so that the stitch skipping can be made at the separated position. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an industrial sewing machine that enables intentional skipping of a main stitch.

  For example, sewing such as jeans and slacks is performed through the following steps in order to produce efficiently. That is, as shown in FIG. 25, the end of the body cloth piece 201 is inserted into the opening of the long waistband cloth piece 200 folded into a substantially U-shaped cross section, and each body cloth piece 201. The overlapping portion of the waistband fabric piece 200 with the inner side 202 and the outer side 203 of the waistband fabric piece 200 without each body fabric piece 201... The skipped portions (non-sewn portions) 204 and 205 are formed, and the chain stitches are continuously performed by so-called intermittent sewing in which the stitches are stitched again by a predetermined distance A. Then, predetermined positions C and C of the waistband cloth piece 200 are cut from the cloth pieces 200, 201... Sewn to take out one piece of slacks, and the cut waistband cloth pieces. The cut end surface 200a of 200 is folded in the direction of arrow D as shown in FIG. 26, and the folded end is sewn 206 as shown in FIG. Through such a process, the body cloth piece 201 such as slacks and the waistband cloth piece 200 can be quickly and massively sewn, so that finally the production efficiency of jeans, slacks, etc. can be significantly increased. The intermittent chain stitching means as described above for intentionally creating a skip portion is known from, for example, Patent Document 1.

  In this manner, intermittently sewing the body cloth pieces 201... And the waistband cloth pieces 200 is very convenient in treating the cut end surface 200 a of the waistband cloth pieces 200. That is, when the body cloth piece 201... And the waistband cloth piece 200 are chain-sewn in series without making a skipped portion, the seam in the vicinity of the cut end face 200a of the waistband cloth piece 200 is sewn to the cut end face. 200a has to be unfolded, but when the body cloth piece 201... And the waistband cloth piece 200 are intermittently stitched together, the seam near the cut end surface 200a of the waistband cloth piece 200 is removed after the chain stitch. Since it is not necessary, the sewing work efficiency can be greatly improved.

By the way, the inner side 202 and the outer side 203 of the waistband fabric piece 200 are both chain stitched.
However, in the case where the inner and outer sides of the waistband fabric piece 200 are chain-sewn, for example, when the used clothing processing (washing or brushing) is performed on a new jeans or the like, the outer side of the waistband fabric piece 200 which is ring-sewn is used. Since 203 is easy to expand and contract, there is a problem that the portion is bent or swung to deteriorate the quality of the sewing product, and a beautiful waistline cannot be produced.

  As a countermeasure against this, the sewing of the outer side 203 of the waistband cloth piece 200 requires a main stitch with less stretchability. If the outer side 203 of the waistband fabric piece 200 is sewn in advance, even if the old jeans processing such as washing is applied to new jeans or the like, the sewing location on the outer side 203 of the waistband fabric piece 200 does not expand and contract. Occurrence can be prevented. For example, Patent Documents 2 and 3 disclose a sewing machine that enables only main sewing.

On the other hand, even when the outer side 203 of the waistband fabric piece 200 is sewn, it is not necessary to open the seam in the vicinity of the cut end surface 200a of the waistband fabric piece 200 after the main stitching, and the intentionally skipped portion so as to increase the production efficiency. Intermittent lockstitch making is desired.
However, conventionally, there is no sewing machine having such a main stitch skipping mechanism, and therefore it has not been possible to realize intermittent regular stitching that intentionally skips stitches.

Japanese Examined Patent Publication No. 2-47238 JP-A-9-135984 JP 7-246296 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sewing machine that can realize intermittent regular sewing that intentionally skips stitches.

The sewing machine according to the present invention will be described with reference to the reference numerals attached to FIGS. 1 to 24 to facilitate understanding of the contents of the invention. (5)
The needle bar mechanism (2) includes a needle bar (7) that moves up and down and a main sewing needle (10) that is held at the lower end of the needle bar, and the hook mechanism (5) includes a hook shaft. (61) An outer hook (49) supported so as to be rotatable around, and an inner hook stopper (50) which is supported in the outer hook so as to be rotatable relative to the outer hook, and on the outer periphery thereof. The provided inner hook (48), and an inner hook detent plate (55) which contacts the inner hook stopper of the inner hook and restricts the inner hook (48) from rotating together with the outer hook (49) within a certain range. ), And a sewing machine configured to form a main stitch by cooperating with the vertical movement of the main sewing needle (10) is provided with a stitch skipping mechanism (6), and this stitch skipping mechanism The hook mechanism (5) is moved closer to the main sewing needle (10) and away from the main sewing needle (10). Movable over the location, and it has the characteristics that are to enable skipping eye position away from the sewing needle (10).
According to such a configuration, for example, on the outside of the waistband cloth piece, intermittent main stitching that intentionally skips the stitch by the shuttle mechanism and the main stitch skipping mechanism is enabled.

  The sewing machine according to claim 1 is the sewing machine according to claim 2, wherein the hook mechanism (5) is incorporated in the hook base (53), the position where the hook base is brought close to the main sewing needle, and the book It can be provided so as to be movable over a position away from the sewing needle. According to this, the shuttle mechanism can be moved easily and reliably. In this case, as in claim 3, the shuttle mechanism (5) is configured to be movable by the air cylinder (70) together with the shuttle base (53), so that the movement mechanism of the shuttle mechanism can be configured more easily. can do.

  In the sewing machine according to any one of claims 1 to 3, a helical gear (62) is fixed to the shuttle shaft (61), and the helical gear is attached to the lower shaft (20). ), The rotation of the lower shaft (20) is transmitted to the shuttle shaft (61) orthogonal to the lower shaft (2). According to this, since the helical gear is cut with the teeth tilted with respect to the shaft, the hook mechanism can be kept engaged even when the hook mechanism is separated from the main sewing needle when skipping, and the hook mechanism is again connected to the main sewing needle. Transmission with the lower shaft is carried out without any problem when approaching to.

  The sewing machine according to any one of claims 1 to 4, as described in claim 5, is provided between the main sewing needle (10) and the shuttle mechanism (5) approaching the main sewing needle. A fine adjustment mechanism (75) for finely adjusting the gap can be provided. According to this, the clearance gap between a main sewing needle and a shuttle mechanism can be taken out correctly.

  In the sewing machine according to claim 5, as described in claim 6, the fine adjustment mechanism (75) includes a cylinder holder (72) for holding the air cylinder (70) and the pot base (53). The cylinder holder can be configured to move together with the pot base by rotating the adjusting screw (81) that is integrally coupled and screwed into the female screw (82) provided on the cylinder holder (72). it can. According to this, the clearance between the main sewing needle and the shuttle mechanism can be accurately and easily made by rotating the adjusting screw.

  According to the sewing machine of the present invention, for example, in order to enable intermittent regular stitching that intentionally skips the outer side of the waistband fabric piece, the old jeans such as wash are subjected to used clothing processing such as washing. Even when it is applied, it is possible to prevent the outer sewn portion of the waistband fabric piece from being drooped or twisted.

  A preferred embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a sewing machine bed portion of a sewing machine according to an embodiment of the present invention with the sewing machine arm portion removed, and FIG. 2 shows a sewing bed portion shown with the differential plate 16 removed from FIG. 3 is a plan view of the sewing machine bed portion of FIG. 1, FIG. 4 is a front view of the sewing machine bed portion of FIG. 1, FIG. 5 is a cross-sectional view taken along line AA in FIG. FIG. 7 is a sectional view taken along the line D-D in FIG. 3, and FIG. 8 is a sectional view taken along the line E-E in FIG. In each of these drawings, the sewing machine of the illustrated example is configured so that intermittent chain stitches and intentional stitches that intentionally create skipped portions can be performed simultaneously. For this purpose, the sewing machine is connected to the sewing machine bed portion 1 by the needle bar mechanism 2, the looper mechanism 3 that forms a chain stitch by cooperation with the needle bar mechanism 2, the stitch skipping mechanism 4 of the chain stitch, and the needle bar mechanism 2. A shuttle mechanism 5 for forming a main seam and a stitch skipping mechanism 6 for the main seam are provided.

  As shown in FIGS. 1, 4, and 5, the needle bar mechanism 2 is fixed to the needle bar 7 that moves up and down in response to the rotation of the upper shaft in the sewing machine arm (not shown), and the lower end of the needle bar 7. Further, a chain stitch needle 9 and a main stitch needle 10 which are held side by side on the needle stock 8 are provided. A needle plate in which the chain stitch needle plate 11 and the main stitch needle plate 12 are integrated is attached to a needle plate base 83 corresponding to the lower side of the chain stitch needle 9 and the main stitch needle 10. A chain stitch feed dog (not shown) is provided at the lower portion of the chain stitch needle plate 11, and a main stitch feed dog (not shown) is provided at the lower portion of the main stitch needle plate 12.

  The looper mechanism 3 itself is known and includes a looper 15 and a spreader 17 as shown in FIGS. A plurality of loopers 15 are fixed side by side in the left-right direction on the upper surface of a looper base 19 that is fitted on the left end side of the looper shaft 18. As shown in FIG. 5, the looper shaft 18 has a lower shaft 20 that rotates in one direction by a sewing machine motor (not shown), a looper crank 21 that is mounted on the left end side of the lower shaft 20, and one end connected to the looper crank 21. The looper drive mechanism including the looper drive rod 22 is reciprocally movable in the axial direction (left and right direction orthogonal to the fabric feed direction F shown in FIG. 1) and swings back and forth about the axis. As a result, the looper 15 moves elliptically so that the lower thread can be engaged with the needle thread in synchronism with the vertical movement of the chain stitch needle 9 to form a chain stitch, thereby enabling double chain stitching.

  As shown in FIG. 16, the spreader 17 has a thread hooking claw 17a, and the spreader shaft 23 is capable of reciprocating in the left-right direction (arrow G direction in FIG. 16) perpendicular to the fabric feed direction F by the spreader drive mechanism. Mounted on the left end. As shown in FIG. 9, the spreader drive mechanism includes a crank (excentor) 24, a spreader drive shaft 25, a spreader lever 26, a spreader bar 27, and a spreader shaft 23 attached to the intermediate portion of the lower shaft 20. With the rotation, the spreader shaft 23 is reciprocated in the left-right direction (in the direction of arrow G in FIG. 16) perpendicular to the material feeding direction F. As shown in FIGS. 9 and 16, an air cylinder 28 is fixed to the left end portion of the spreader shaft 23 with a bolt 29 or the like, and a movable spreader mounting base 30 is attached to the air cylinder 28, and the spreader mounting base 30 is attached to the spreader mounting base 30. The auxiliary base 31 is fixed with a bolt 32 or the like, and the spreader 17 is fixed to the spreader auxiliary base 31 with a set screw 33 or the like. Thus, the spreader 17 hooks the lower thread of the looper 15 on the thread hooking claw 17a as the spreader shaft 23 reciprocates in the left-right direction, and brings it closer to the needle thread.

The stitch skipping mechanism 4 of the chain stitches moves the spreader 17 in the rearward direction substantially the same as the fabric feed direction F to perform a yarn feed (see FIG. 18), and from this yarn feed position to the counter fabric feed direction. The air cylinder 28 is provided so as to be able to advance and retreat in the front-rear direction over the retreat position (see FIG. 19), and skipping is possible at the retreat position.
That is, as shown in FIG. 20, the air cylinder 28 is provided with a cylinder portion 34 and a guide hole 35 arranged in parallel on the left and right. A double-acting piston 36 is inserted into the cylinder portion 34 so as to be able to reciprocate in the front-rear direction, and the front open end side in the cylinder portion 34 is closed by a rod cover 37, a rod plate 38, a packing 39, and the like. The piston rod 40 passes through the cover 37 and the rod plate 38. A guide rod 41 is inserted into the guide hole 35 via a cylinder bush 42.

On the other hand, as shown in FIG. 16, the movable spreader mounting base 30 is formed in an L shape in a plan view having a substrate portion 30a extending in the left-right direction and an arm portion 14b extending rearward from the left end of the substrate portion 30a. Thus, the spreader auxiliary base 31 is fixed to the arm portion 30b. As shown in FIGS. 16 and 20, a screw hole 43 and an insertion hole 44 are provided side by side on the board portion 30 a of the movable spreader mounting base 30, and the screw hole 43 has a front end of the piston rod 40. The screw portion 40a is screwed and fastened and fixed with a nut 45, and the front end portion of the guide rod 41 is fixed to the insertion hole 44 with a bolt 46 or the like.
The piston 36 sucks air alternately on both sides of the piston 36 and reciprocates in the front-rear direction, and the forward movement in the rearward direction causes the spreader 17 to move in the rearward direction (arrow H direction) substantially the same as the fabric feed direction F. Moves to the yarn gathering position where the yarn gathering is performed (see FIGS. 16 and 20A), and moves backward to the reverse position in which the spreader 17 retracts in the anti-fabric feed direction, that is, in the forward direction (arrow I direction). Move (see FIGS. 17 and 20B).

  Therefore, when the spreader shaft 23 is reciprocated in the left-right direction while the piston 36 is moved forward and the spreader 17 is moved to the yarn shifting position, the spreader 17 is reciprocated in the left-right direction to A chain stitch is performed to hook the thread 47 (see FIG. 18) and bring it into a needle thread (not shown) (see, for example, the chain stitch on the inner side 202 of the waistband fabric piece 200 in FIG. 25). When the piston 36 is moved backward, the spreader 17 moves to the anti-fabric feed direction, that is, the retracted position retracted in the forward direction indicated by the arrow I. Therefore, the spreader 17 cannot catch the lower thread of the looper 15, The chain stitching is not performed only by proceeding in the feeding direction F, and the stitch skipping is performed (see, for example, the stitch skipping portion 204 of the chain stitch inside 202 of the waistband cloth piece 200 in FIG. 25). The reciprocating motion of the double-acting piston 36 is controlled by a detection signal of a sensor (not shown) for detecting the terminal edge (201b in FIG. 25) and the starting edge (201a in FIG. 25) of the cloth piece. It is automatically controlled by a control device (not shown).

  Thus, since the spreader 17 is provided so as to be able to advance and retract in the same front-rear direction as the movement direction of the looper 15, it is possible to reliably carry out an intended skip without interfering with the looper 15. Further, even if the yarn hooking claw 17a of the spreader 17 is as close as possible to the looper 15 so as to be positioned below the outermost circumferential track J of the looper 15 as shown in FIG. The lower thread 47 can be reliably hooked to perform the yarn shifting, and unintentional stitch skipping can be prevented, and appropriate chain stitching can always be performed. Further, the spreader 17 that moves in the same longitudinal direction as the movement direction of the looper 15 can be used without any problem even when the pitch between the needles 9 and 9 is small with a plurality of chain stitch needles 9. Since the spreader 17 is moved back and forth in the front-rear direction using the double-acting piston 36, it can cope with high-speed operation of the sewing machine.

  In the above-described embodiment, the spreader 17 is moved back and forth linearly by the piston 36 of the air cylinder 28. Alternatively, the spreader 17 can be moved back and forth by a circular motion using a rotary cylinder.

Next, the shuttle mechanism 5 that forms the main seam in cooperation with the needle bar mechanism 2 and the stitch skipping mechanism 6 of the main seam will be described.
The hook mechanism 5 itself is a publicly known thing made of a horizontal full rotation type hook, and includes an inner hook 48 and an outer hook 49 as shown in FIGS. 5, 7, 9 to 15, and 21. As shown in FIG. 21, the inner hook 48 is provided with an inner hook stopper 50, an opener 51, and a bobbin support 52. As shown in FIG. 23 (b), the inner hook stopper 50 is a protrusion provided in the horizontal direction outside the upper edge of the inner hook 48 in order to prevent the inner hook 48 from rotating. As shown in (b), the inner side of the hook base 53 is fixed to the one side surface (left side surface) of the hook base 53 in which the hook mechanism 5 is integrally incorporated with the bolt 54 in a vertical direction. It is fitted in the notch 56 of the shuttle stopper plate 55. As shown in FIG. 23 (b), the notch 56 is configured as a gap between the forward stopper 57 a and the backward stopper 57 b provided in the inner hook stopper plate 55, and the width of the notch 56 is the inner hook stopper 50. It is set larger than the width of. Accordingly, the rotation of the inner hook 48 is limited to a slight fixed range in which the inner hook stopper 50 contacts the pair of forward stopper 57a and backward stopper 57b. The per opener 51 is a protrusion to which an opener, which will be described later, faces. The bobbin support 52 is a support shaft for mounting the bobbin 58 in the inner hook 48. A bobbin presser 59 is provided at the upper end of the bobbin support 52.

  The notch 56 and the forward stopper 57a and the backward stopper 57b are integrally formed on the back side of the main sewing needle plate in the conventional general hook mechanism. In order to move the hook mechanism 5 together with the hook base 53 so as to be able to be skipped, the inner hook detent plate 55 is separated from the main sewing needle plate 12 and vertically attached to one side of the hook base 53 as described above. Forming.

  On the other hand, the outer hook 49 is provided with a sword tip 60 and a hook shaft 61 as shown in FIGS. The sword tip 60 is a claw for capturing an upper thread guided by the main sewing needle 10 and circulating it around the outer periphery of the inner hook 48 to form a loop, thereby forming a main seam with the lower thread. As shown in FIG. 7 and FIG. 23 (c), the shuttle shaft 61 orthogonal to the lower shaft 20 has a small-diameter helical gear 62 fixed to the lower portion thereof, and this helical gear 62 is fixed to the left end of the lower shaft 20. The rotation of the lower shaft 20 is transmitted to the outer hook 49 by meshing with the helical gear 63 having a large diameter, and at the same time, the hook shaft 61 drives an opener, which will be described later, via an eccentric cam 64 formed integrally therewith. .

  In addition to the inner hook 48 and the outer hook 49, a known opener mechanism is added to the hook mechanism 5 as necessary. The opener mechanism comprises an opener 65, an opener lever 66, and an opener link 67, as shown in FIGS. The opener link 67 is a link that connects the eccentric cam 64 of the shuttle shaft 61 and the opener lever 66 so as to be interlocked with each other. In addition to this, as shown in FIGS. 7, 15, and 21, the hook mechanism 5 includes a hook bearing 97 that supports the hook shaft 61 within the pot base 53, a hook shaft upper plate 98, a bearing 99, and FIG. 14. As shown in FIG. 4, a pot base cover 100 attached to one side (left side) of the pot base 53 with a bolt 101 is provided.

  The shuttle mechanism 5 configured in this way is mounted side by side with the looper mechanism 3 on the sewing machine bed 1 as shown in FIGS.

  Next, the operation of the shuttle mechanism 5 will be described with reference to FIG.

  In FIG. 23, when the sewing machine is driven, the outer shuttle 49 fully rotates clockwise (arrow K direction) around the shuttle shaft 61 that is passively rotated through the helical gears 63 and 62 through the lower shaft 20. The opener 65 swings in the direction of the arrow MN with the opener lever bearing 68 as a fulcrum. Due to the swinging movement of the opener 65, the upper thread inserted through the main sewing needle 10 can easily pass through the gap between the inner hook stopper 50 and the forward stopper 57a, and travels around the outer periphery of the inner hook 48. be able to.

  That is, as the sword tip 60 of the outer hook 49 rotates in the direction of the arrow K, the sword tip 60 captures the upper thread guided by the main sewing needle 10 and circulates it around the outer periphery of the inner hook 48 to form a loop. . The loop of the upper thread traveling on the outer periphery of the inner hook 48 moves sequentially in the direction of the arrow K from the position where the upper thread is separated from the forward stopper 57a and enters the notch 56. When the upper thread leaves the forward stopper 57a and is about to enter the notch 56, the opener 65 is displaced maximum in the arrow N direction. For this reason, a gap is formed between the inner hook stopper 50 of the inner hook 48 and the advance stopper 57a, and the upper thread passes through the gap between the inner hook stopper 50 and the advance stopper 57a.

Thereafter, with the maximum displacement of the opener 65 in the direction of the arrow M, a gap is formed between the inner hook stopper 50 and the reverse stopper 57b, and the upper thread that is looped through the gap passes through the sword tip 60. . Thus, the upper thread that has passed through the gap between the inner hook stopper 50 and the reverse stopper 57b is entangled with the lower thread fed from the bobbin 58 to form a main stitch. For example, a main seam is formed on the outer side 203 of the waistband fabric piece 200 of FIG. In addition, after the upper thread comes out of the sword tip 60, the outer hook 49 idles once, captures the upper thread again by the sword tip 60 in the second rotation, and repeats a series of operations.
As is clear from the above description, the opener 65 is provided to improve the removal of the upper thread, but is not necessarily required.

Next, the stitch skipping mechanism 6 that is a feature of the present invention will be described with reference to FIGS. 5, 6, 10, 13 to 15, and 22 to 24.
The skip mechanism 6 is provided so as to be movable between a position where the shuttle mechanism 5 is brought close to the main sewing needle 10 of the needle bar mechanism 2 (see FIG. 23) and a position where the hook mechanism 5 is separated from the main sewing needle 10 (see FIG. 24). The stitches can be skipped at a position away from the main sewing needle 10. As shown in FIGS. 10, 13, and 15, the hook mechanism 5 is incorporated in the pot base 53 and is provided so as to be movable by the air cylinder 70 together with the pot base 53. The timing of releasing the shuttle mechanism 5 from the main stitch needle 10 is performed in synchronization with the retraction of the spreader 17 of the chain stitch skipping mechanism 4 from the thread shifting position.

  The pot base 53 is positioned by an air cylinder 70. That is, as shown in FIGS. 10, 21, and 22, the air cylinder 70 includes a cylinder holding portion 72 a that holds the air cylinder 70 by tightening bolts 71 and a screw receiving portion 72 b at a predetermined interval from side to side. The cylinder holder 72 is provided in a shape opposite to each other, and is fixed on the sewing machine bed portion 1 by tightening a bolt 74 into a long hole 73 provided between the cylinder holding portion 72a and the screw receiving portion 72b. Prior to this fixing, the gap between the main sewing needle 10 and the sword tip 60 of the hook mechanism 5 that is brought close to the main sewing needle 10 is finely adjusted by the fine adjustment mechanism 75, and the cylinder holder 72 is bolted after the fine adjustment. The air cylinder 70 is fixed onto the sewing machine bed 1 by performing the final tightening at 74. As shown in FIGS. 6, 14, and 21, the protruding end portion of the piston rod 76 of the air cylinder 70 is attached to a plate 78 fixed to the other side surface (right side surface) of the pot base 53 with screws 77 and bolts 79 and nuts 80. Combined by etc.

  The fine adjustment mechanism 75 integrally couples a cylinder holder 72 that holds the air cylinder 70 and the pot base 53, and screwes an adjustment screw 81 into the cylinder holder 72 to rotate the adjustment screw 81. The cylinder holder 72 is configured to be movable together with the pot base 53. That is, as shown in FIG. 22, the fine adjustment mechanism 75 is arranged on the needle plate base 83 so as to face the adjustment screw 81, the female screw 82 provided in the screw receiving portion 72b of the cylinder holder 72, and the screw receiving portion 72b. And a bracket 85 fixed with a bolt 84. As shown in FIG. 10, the adjustment screw 81 is screwed into the female screw 82 of the cylinder holder 72, and the tip end portion of the adjustment screw 81 is coupled to the bracket 85 so as to be freely rotatable. In this case, the cylinder holder 72 can be moved in the left-right direction together with the air cylinder 70 by rotating the adjusting screw 81 and positioned. After this positioning, the cylinder holder 72 is finally tightened and fixed to the sewing machine bed 1 with bolts 74.

  As shown in FIG. 7, the pot base 53 is attached to the lower surface of the needle plate base 83 in a suspended state so as to be linearly movable via a linear guide 86. As shown in FIGS. 7, 21, and 22, the linear guide 86 has a groove member 86a fixed to the lower surface of the needle plate base 83 with screws 87 and 87, and a ball in the groove 86b on the lower surface of the groove member 86a. And a square bar member 86c that is slidably fitted through a roller-like or needle-like rolling member 86d (see FIG. 7) and fixed to the upper surface of the pot base 53 with a bolt 89.

  Thus, when the piston rod 76 of the air cylinder 70 moves forward (protrudes), the hook mechanism 5 moves to the position close to the main sewing needle 10 together with the hook base 53 (see FIG. 23). When the main sewing is completed for a predetermined distance, the piston rod 76 moves backward to move the hook mechanism 5 to the position where the hook base 53 is separated from the main sewing needle 10 by a predetermined distance (see FIG. 24). Thereby, a skip portion of the main seam is formed. The skip portion is formed, for example, in a portion corresponding to the skip portion 205 on the outer side of the waistband fabric piece 200 of FIG. The air cylinder 70 is controlled in the same manner as in the reciprocating control of the double-acting piston 36 in the chain stitch skipping mechanism 4 described above, the trailing edge (201b in FIG. 25) and the starting edge ( In FIG. 25, it is automatically controlled simultaneously with the control of the double-acting piston 36 by a control device (not shown) based on a detection signal of a sensor (not shown) for detecting 201a).

  The timing at which the hook mechanism 5 is separated from the main sewing needle 10 in the stitch skipping mechanism 6 of the main stitch is such that thread breakage occurs when the hook mechanism 5 is released from the main sewing needle 10 when the upper thread is hooked on the sword tip 60. Therefore, the hook mechanism 5 is separated from the main sewing needle 10 from when the upper thread is detached from the sword tip 60 until it is hooked on the sword tip 60 again in the next step. Thereby, thread breakage can be prevented.

  According to the sewing machine configured as described above, for example, when sewing jeans, slacks, and the like, with reference to FIG. And intermittent intermittent stitching for making a skip by the looper mechanism 3 and the skip stitching mechanism 4 for the inner side 202 of the waistband fabric piece 200 can be performed simultaneously. . Therefore, even when used clothing processing such as washing is performed, it is possible to efficiently sew jeans or the like that are free from any drooping or wrinkling on the outer side 203 of the waistband fabric piece 200.

  Although the sewing machine of the above embodiment is a combination of chain stitches and main stitches, the present invention can be similarly applied to a sewing machine dedicated to main stitches.

It is a perspective view showing the sewing machine bed part of the sewing machine concerning one example of the present invention in the state where the sewing machine arm part was removed. FIG. 2 is a perspective view of a sewing machine bed portion shown in a state where a differential plate 16 is removed from FIG. 1. It is a top view of the sewing machine bed part of FIG. It is a front view of the sewing machine bed part of FIG. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is CC sectional view taken on the line in FIG. It is the DD sectional view taken on the line in FIG. It is the EE sectional view taken on the line in FIG. FIG. 2 is an overall perspective view showing a state in which a sewing machine frame is removed from FIG. 1. FIG. 2 is a plan view showing a shuttle mechanism and a main stitch skipping mechanism with the sewing machine frame removed from FIG. 1. FIG. 2 is a front view showing a shuttle mechanism and a main stitch skipping mechanism with the sewing machine frame removed from FIG. 1. It is a side view in FIG. It is the FF sectional view taken on the line in FIG. It is the GG sectional view taken on the line in FIG. It is the HH sectional view taken on the line in FIG. It is a perspective view shown in the state where the spreader was moved to the yarn shifting position. It is a perspective view shown in the state where a spreader was moved to a retreat position. It is a side view shown in the state where the spreader was moved to the yarn shifting position. It is a side view shown in the state where a spreader was moved to a retreat position. It is sectional drawing of the air cylinder of a spreader, (a) is shown in the state which moved the spreader to the yarn shifting position, (b) is shown in the state which moved the spreader to the retreat position. It is a disassembled perspective view of a shuttle mechanism. It is a disassembled perspective view of the fine adjustment mechanism of a shuttle mechanism. FIG. 4 is an operation diagram of the hook mechanism, wherein (a) is a front view showing a state in which the hook mechanism is brought close to the main sewing needle, (b) is a plan view showing a state in which the hook mechanism is brought close to the main sewing needle, ) Is a plan view showing the state where the shuttle mechanism is brought close to the main sewing needle in a partially broken state. It is a front view which shows the state which separated the shuttle mechanism from the main sewing needle. It is the schematic which shows the case where it sews and skips over a cloth piece. It is the schematic which expands and shows the part which cut | disconnected the waist belt cloth piece. It is the partial schematic diagram which shows the state which folded the edge part which cut | disconnected the waist belt cloth piece inside, and sewed this edge part.

Explanation of symbols

1 Sewing machine bed 2 Needle bar mechanism 5 Hook mechanism 6 Stitch skipping mechanism 7 Needle bar 10 Stitch needle 20 Lower shaft 48 Inner hook 49 Outer hook 50 Inner hook stopper 53 Hook base 55 Inner hook stopper plate 61 Hook axis 62,63 Helical gear 70 Air cylinder 72 Cylinder holder 75 Fine adjustment mechanism 81 Adjustment screw 82 Female screw

Claims (6)

A needle bar mechanism, and a hook mechanism. The needle bar mechanism includes a needle bar that moves up and down, and a lock needle that is held at the lower end of the needle bar. An outer hook supported rotatably in the outer hook, an inner hook supported in the outer hook so as to be rotatable relative to the outer hook, and provided with an inner hook stopper on the outer periphery thereof, and an inner hook of the inner hook An inner hook detent plate that contacts the inner hook stopper and restricts the inner hook from rotating together with the outer hook within a certain range, and forms a main seam in cooperation with the vertical movement of the main sewing needle. In the sewing machine configured as follows,
A stitch skip mechanism is provided, and the stitch skip mechanism is movably provided between a position where the shuttle mechanism is brought close to the main sewing needle and a position where the hook mechanism is separated from the main sewing needle. A sewing machine characterized by enabling skipping at a position where it is released.   The sewing machine according to claim 1, wherein the hook mechanism is incorporated in a hook base and is movably provided between a position where the hook base is brought close to the main sewing needle and a position away from the main sewing needle.   The sewing machine according to claim 2, wherein the shuttle mechanism is provided so as to be movable by an air cylinder together with the shuttle base.   A helical gear is fixed to the hook shaft, and the helical gear is meshed with a helical gear fixed to the lower shaft so that the rotation of the lower shaft is transmitted to the hook shaft orthogonal to the lower shaft. The sewing machine according to any one of 1 to 3.   The sewing machine according to any one of claims 1 to 4, further comprising a fine adjustment mechanism that finely adjusts a gap between the main sewing needle and the shuttle mechanism that approaches the main sewing needle. The fine adjustment mechanism integrally connects a cylinder holder that holds the air cylinder and the pot base, and rotates the adjustment screw screwed into a female screw provided in the cylinder holder. The sewing machine according to claim 5, wherein the holder is configured to be movable together with the pot base.

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