Sewing device

Abstract

The present invention provides a sewing device to make the tape sewn with the cloth a straight line with the article obtained by loading the zipper on the cloth as the sewed object. The sewing device of the present invention presses the sewed object (3) on the workbench (1) from above one tape (33a) of a pair of tapes (33a, 33b) of the zipper (32) while transporting the sewed object (3) parallel to the length direction of the chain row of the zipper, and sews the other tape (33b) and the cloth (30) by the sewing machine (2). Moreover, the sewing device includes a chain guide (5) capable of positioning the chain row (34L) of the zipper during sewing, and a guide displacement device (6) capable of moving the chain guide to a positioning position and a standby position. The sewing machine presser foot (7) of the sewing machine has a path correction surface (72b) that collides with the puller (35) of the zipper to correct the approach of the puller (35).

Description

TECHNICAL FIELD

[0001] The present application relates to a sewing device which sews a zipper and a fabric with respect to a pair of tapes of the zipper, and more particularly to a sewing device which sews a pair of tapes of a zipper and a fabric with respect to a pair of tapes of the zipper. BACKGROUND

[0002] As an example of the above-described sewing device, there is known a device which sews a fly and a tape of a zipper as a fabric in the following steps of 1) to 6) (Patent Literature 1).

[0003] 1) The fly as a fabric is placed on a top plate as a work table.

[0004] 2) The fly is held by a second pressing plate and a third pressing plate in a manner of pressing an end portion on one side in a width direction.

[0005] 3) The zipper is placed in a manner of overlapping a portion which is not pressed by the second pressing plate and the third pressing plate on the fly.

[0006] 4) The zipper is positioned with respect to the fly by side shifting the zipper by a pair of side shifting plates.

[0007] 5) An end portion on the other side in the width direction is pressed with respect to the fly and the zipper in the state of being positioned by a fourth pressing plate. At this time, the fourth pressing plate is held at a position avoiding the second pressing plate, the third pressing plate, and the pair of side shifting plates.

[0008] 6) The positioning by the second pressing plate, the third pressing plate, and the pair of side shifting plates is released, and the fly and the tape are sewn by the sewing machine while being pressed by the fourth pressing plate and being transported toward the sewing machine.

[0009] PRIOR ART DOCUMENT

[0010] PATENT LITERATURE

[0011] Patent Literature 1: Japanese Patent No. 6423568 SUMMARY

[0012] However, in Patent Literature 1, the pressing manner of the fourth pressing plate is described as follows: the fly fabric and the zipper are pressed in a manner of avoiding the back side half in the Y direction of the zipper. In addition, the Y direction refers to a direction from the front side toward the back side of the sewing device (a direction orthogonal to the X direction). Further, the X direction refers to a direction in which the fly fabric and the zipper to be sewn are advanced.

[0013] Based on this description, it is not clear whether the portion pressed by the fourth presser plate is the front side tape, the front side portion of the fastener stringers or the puller, or all of these. However, since the fourth presser plate is a plate, it is understood that the portion pressed by the fourth presser plate is the front side tape. Moreover, the fourth presser plate conveys the fly fabric and the zipper in such a manner that the back side tape passes directly below the needle of the first sewing machine.

[0014] If the fourth presser plate presses the front side tape, there is a possibility that the portion of the zipper that is not pressed, that is, the fastener or the back side tape, is slightly deviated in the Y direction during sewing, and there is a possibility that the tape and the fly fabric are sewn in this deviated state. That is, there is a possibility that the tape of the zipper and the fly fabric below it are sewn in a state in which positioning is not sufficient, and thus there is a possibility that the tape sewn to the fabric is slightly bent and cannot be a straight line.

[0015] In addition, the pair of tapes of the zipper is in a shape that includes a straight portion extending in a straight line with the puller as a boundary and a pair of branch portions that branch into two forks. Moreover, since the puller is thicker than the fastener stringers, the pair of tapes is in a shape that has a wrinkle near the puller, in other words, a shape that has a convex-concave like a wave in the thickness direction of the tape.

[0016] In the sewing apparatus of Patent Literature 1, in the case of sewing the zipper and the fabric in such a shape, the fabric and the zipper are conveyed together in a state in which the straight portion is on the downstream side in the conveying direction, and the fabric and the zipper are sewn. Then, the stitch S1 is formed as shown in Figure 7 even if the straight portion is formed in a straight line that is substantially parallel to the outer side in the width direction of the tape, the puller portion is bent, and the branch portions are formed so as to be inclined with respect to the outer side in the width direction of the tape in a manner that maintains the shape of the branch portions.

[0017] The present application was created in consideration of the above-described circumstances, and aims to make the tape sewn to the fabric as straight as possible. In addition, it is preferable to make the branch portions in the tape as straight as possible as well as the straight portions, and to make the stitch as straight as possible.

[0018] The sewing device of the present application takes as a sewn object an article obtained by loading a zipper on a cloth. In addition, the sewing device of the present application transports the sewn object in parallel with the length direction of the chain row of the zipper while pressing the sewn object from above one of the pair of tapes of the zipper against the table, and sews the other tape and the cloth by the sewing machine. Moreover, the sewing device of the present application is characterized by comprising: a chain guide that is capable of positioning the chain row of the zipper in the width direction of the chain row on the upstream side in the transport direction with respect to the needle of the sewing machine during sewing; and a guide displacement device that is capable of displacing the chain guide to a positioning position at which the chain row is positioned and a standby position at which the chain row is waited for away from the chain row.

[0019] In addition, the structure of the chain guide and the guide displacement device can be anything, and in order to form a simple structure, it is preferable as described below.

[0020] That is, the chain guide includes a guide arm that is supported so as to be swingable in the up-and-down direction, and a pair of guide pieces that protrude from the swing end of the guide arm and guide the chain row from both sides in the width direction. The guide displacement device includes a shaft that fixes the swing center side of the chain guide, and a swing device that supports the shaft together with the chain guide so as to be swingable with the shaft as the center.

[0021] The shape of the pair of tapes differs with the slider as a boundary. Therefore, when the other tape is sewn with the cloth, it is easy to make the stitch bend around the slider, or it is easy to maintain the shape of the tape as the same as before sewing, that is, to maintain the shape of the branch. In order to prevent this as much as possible, it is preferable as described below.

[0022] That is, the zipper includes a straight portion in which the pair of tapes extend linearly with the slider as a boundary, and a pair of branch portions that branch into two forks. Moreover, the zipper is transported in a state in which the straight portion is located on the downstream side in the transport direction with respect to the slider. Moreover, the sewing device of the present application preferably has, in addition to the chain guide and the guide displacement device, a sewing machine presser foot that presses the upper surface of the sewn object.

[0023] The face of the sewing machine presser foot that faces the chain row in the width direction of the chain row has a route correction face that corrects the route of the slider in the event of collision with the slider. Moreover, the route correction face gradually approaches the passage of the chain row toward the downstream side in the transport direction.

[0024] In addition, the details of the route correction face can be anything, and for example, it can be recessed in a step shape, but in order to smoothly correct the route of the slider, it is preferable as described below.

[0025] That is, the route correction face is recessed in a circular arc shape when viewed from above.

[0026] In addition, the needle hole of the presser foot can be provided at any position, but in order to form the stitches in a manner close to the needle bar, it is preferable as described below.

[0027] That is, the presser foot has a needle hole at a position apart from the downstream side in the conveyance direction with respect to the approach correction surface.

[0028] In addition, the presser foot can be provided at any position on the downstream side in the conveyance direction with respect to the approach correction surface. However, in order to sew the other strip in a straight line shape as much as possible like the straight line portion, it is preferable as described below.

[0029] That is, the presser foot has an approach maintenance surface that maintains the approach of the slider corrected by the approach correction surface on the downstream side in the conveyance direction with respect to the approach correction surface. Further, the approach maintenance surface extends in a straight line in the conveyance direction.

[0030] In addition, the presser foot can be provided at any position on the upstream side in the conveyance direction with respect to the approach correction surface. However, in order to smoothly induce the slider to the approach correction surface, it is preferable as described below.

[0031] That is, the presser foot has an induction surface that induces the slider to the approach correction surface on the upstream side in the conveyance direction with respect to the approach correction surface. Further, the induction surface extends in a straight line in the conveyance direction.

[0032] The needle bar guide can position the needle bar in the upstream side in the conveyance direction with respect to the needle of the sewing machine, and the details can be anything, but in order to continue sewing in a state where the needle bar guide positions the needle bar as close to the slider as possible and sewing in a state where the presser foot corrects the approach of the slider, it is preferable as described below.

[0033] That is, the needle bar guide positions the needle bar in the upstream side in the conveyance direction with respect to the needle of the sewing machine and in a position corresponding to the entire length of the induction surface in the conveyance direction.

[0034] Effects of the Invention

[0035] The sewing device of the present application is in a state where the work to be sewn is pressed from above one of the pair of strips to be positioned, and can position the needle bar by disposing the needle bar guide at the positioning position, so it becomes a state where the positioning of the work to be sewn is sufficiently performed, and as a result, it becomes a state where the shape of the other strip to be sewn is approximately a straight line compared to the sewing device that sews only one strip.

[0036] Further, in the sewing device of the present application, if the sewing machine presser foot including the path correction surface is included, the path correction surface gradually approaches the passage of the needle bar as it goes toward the downstream side in the conveyance direction, so the path of the slider is corrected by colliding with the path correction surface, and thus the path of the portion near the slider in the other strip is also corrected, and the shape of the other strip including the portion near the slider and the stitch are approximated to be straight, compared with the sewing device having the sewing machine presser foot not provided with the path correction surface.

[0037] Further, in the sewing device of the present application, if the path correction surface is concave in a circular arc shape when viewed from above, the path of the slider is smoothly corrected along the circular arc, and thus the shape of the other strip including the portion near the slider and the stitch are approximated to be straight.

[0038] Further, in the sewing device of the present application, if the sewing machine presser foot has the needle hole at a position apart from the path correction surface toward the downstream side in the conveyance direction, the stitch can be formed in a manner of approaching the needle bar, compared with the sewing device having the needle hole at a position apart from the path correction surface in a direction orthogonal to the conveyance direction when viewed from above.

[0039] Further, in the sewing device of the present application, if the sewing machine presser foot including the path maintenance surface is included, the path maintenance surface extends in a straight line in the conveyance direction, so the slider whose path is corrected is conveyed along the path maintenance surface, and thus the path of the portion on the upstream side in the conveyance direction with respect to the slider, that is, the branch portion in the other strip is also corrected, and the shape of the other strip including the portion near the slider and the stitch are approximated to be straight, compared with the sewing device having the sewing machine presser foot not provided with the path maintenance surface.

[0040] Further, in the sewing device of the present application, if the sewing machine presser foot including the path maintenance surface is included, the path maintenance surface extends in a straight line in the conveyance direction, so the slider whose path is corrected is conveyed along the path maintenance surface, and thus the path of the portion on the upstream side in the conveyance direction with respect to the slider, that is, the branch portion in the other strip is also corrected, and the shape of the other strip including the portion near the slider and the stitch are approximated to be straight, compared with the sewing device having the sewing machine presser foot not provided with the path maintenance surface.

[0041] In addition, in the sewing apparatus of the present application, if the chain guide is capable of positioning the chain row at a position corresponding to the upstream side in the conveyance direction with respect to the needle of the sewing machine and in the range of the entire length of the conveyance direction of the induction surface, the chain guide is displaced to the standby position after sewing is completed in a state in which the chain guide positions the chain row until the chain guide is as close as possible to the slider, whereby the time difference between the end of sewing in a state in which the chain guide positions the chain row and the start of sewing in a state in which the sewing machine presser foot corrects the path of the slider using the path correction surface is shortened, and the shape of the other strip sewn including the vicinity of the slider and the stitch are approximated to a straight line, compared to the sewing apparatus in which the time difference is long. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a perspective view showing a sewing apparatus of a first embodiment of the present application.

[0043] Figure 2 (a) to (d) of FIG. 1 are explanatory views showing a sewing step of a work by the sewing apparatus of the first embodiment.

[0044] Figure 3 is an explanatory view showing an operation of the sewing apparatus of the first embodiment.

[0045] Figure 4 is a plan view showing a sewing state of a work in the sewing apparatus of the first embodiment.

[0046] Figure 5 is a plan view showing a positional relationship of each part of the sewing apparatus of the first embodiment.

[0047] Figure 6 is a plan view showing a sewing state of a work in a sewing apparatus of a second embodiment.

[0048] Figure 7 is a plan view showing a sewing state of a work in a conventional sewing apparatus.

[0049] EXPLANATION OF REFERENCE NUMERALS

[0050] 1 table

[0051] 2 sewing machine

[0052] 2a sewing machine main body

[0053] 21 needle

[0054] 22 column portion

[0055] 23 sewing machine head

[0056] 23a connecting rod

[0057] 23b needle bar

[0058] 23c fixing member

[0059] 3 article to be sewn

[0060] 30 cloth

[0061] 32 slide fastener

[0062] 33a pressing side tape

[0063] 33b sewing side tape

[0064] 33S straight portion

[0065] 33T branched portion

[0066] 34 chain stitch

[0067] 34L chain stitch row

[0068] 35 slider

[0069] 36 first stopper

[0070] 37 second stopper

[0071] 4 conveying device

[0072] 41 pressing portion

[0073] 5 chain stitch guide

[0074] 51 guide arm

[0075] 52 guide piece

[0076] 52a inclined surface

[0077] 52b parallel surface

[0078] 53 guide groove

[0079] 6 guide displacement device

[0080] 61 shaft

[0081] 62 oscillating device

[0082] 63 cylinder device

[0083] 63a piston rod

[0084] 63b cylinder

[0085] 63c bracket

[0086] 64 conversion device

[0087] 65 Bearing section

[0088] 65a base block

[0089] 65b collar

[0090] 65d collar flange

[0091] 65f flange

[0092] 66 Crank

[0093] 66a crank pin

[0094] 66b crank arm

[0095] 67 Transfer Block

[0096] 67a Step surface

[0097] 68. Tension Spring

[0098] 7. Sewing machine presser foot

[0099] 71 Fixing part

[0100] 72 Presser foot

[0101] 72a Induced Surface

[0102] 72b Approach Correction Plane

[0103] 72c approach maintenance surface

[0104] 72h pinhole

[0105] L1 Total Length

[0106] P1 Location

[0107] P2 Standby Position

[0108] S1 line

[0109] X Conveying direction Detailed Implementation

[0110] The sewing device of the first embodiment of the present invention uses a workpiece 3 such as... Figure 4 As shown, a zipper 32 is mounted on the fabric 30. For example, the fabric 30 may have a placket. Furthermore, the fabric 30 is overlock sewn on one side in the width direction before being sewn by the sewing device of the first embodiment. Additionally, in Figure 4 In the sewn object 3 shown, the fabric 30 and the zipper 32 have been sewn together by the sewing device of the first embodiment to form a stitch S1.

[0111] The explanation is made with the state where the zipper 32 is laid flat as a reference. The zipper 32 includes: a pair of tapes 33a, 33b extending in a length direction and facing each other in a width direction orthogonal to the length direction; a plurality of teeth 34 fixed to facing side edge portions of the pair of tapes 33a, 33b in the length direction thereof at intervals; a puller 35 opening and closing a row of teeth 34L including all the teeth 34; and a first stopper 36 and a second stopper 37 colliding with the puller 35 to define both ends of a movement range of the puller 35. Further, the tapes 33a, 33b are soft tapes.

[0112] The first stopper 36 defines a closed side boundary position of the row of teeth 34L within the movement range of the puller 35, and is fixed to the facing side edge portions of one tape 33a in the illustrated example.

[0113] The second stopper 37 defines an open side boundary position of the row of teeth 34L within the movement range of the puller 35, and is fixed to the facing side edge portions of the pair of tapes 33a, 33b in the illustrated example. The width of the second stopper 37 is slightly larger than the row of teeth 34L, and slightly protrudes in both directions of the width direction with respect to the row of teeth 34L.

[0114] The zipper 32 is in a state where the row of teeth 34L is completely closed, in other words, a state where adjacent teeth 34 engage with each other with respect to all the teeth 34, and is in a state where the puller 35 is in contact with the first stopper 36. In this state, the row of teeth 34L is in a linearly extending form. The direction of the linearly extending is the length direction of the zipper 32, and is the length direction of the row of teeth 34L. On the other hand, a direction orthogonal to the length direction of the row of teeth 34L in a state of viewing the zipper 32 from above is the width direction of the zipper 32, and is the width direction of the row of teeth 34L.

[0115] In addition, the zipper 32 includes a straight line portion 33S in which the pair of tapes 33a, 33b extends linearly with the puller 35 as a boundary, and a pair of branch portions 33T branching into two forks. The sewn article 3 is in a state where the zipper 32 is overlapped on the cloth 30 and the cloth 30 protrudes to both sides of the width direction of the straight line portion 33S. Also, the sewn article 3 is conveyed in a state where the linear direction of the straight line portion 33S is always kept parallel to the conveyance direction X, and a state where the straight line portion 33S is kept on the downstream side of the conveyance direction X with respect to the puller 35, so that one tape 33b and the cloth 30 are sewn, forming a stitch S1.

[0116] The puller 35 includes a puller main body 35a guided by the row of teeth 34L in a movable manner, and a pull tab (not shown) linked to the puller main body 35a. In a state where the zipper 32 is placed on the cloth 30, the pull tab is in an overlapping state with the puller main body 35a.

[0117] In addition, the puller main body 35a includes a fastener string passage (not shown) that passes through the length direction of the fastener string row 34L, and a belt groove (not shown) that communicates with the fastener string passage and opens in the width direction of the fastener string row 34L as an internal space thereof.

[0118] One side in the length direction of the fastener string passage is a main path, and the other side in the length direction includes a pair of branch paths that branch into two prongs in the width direction of the fastener string row 34L.

[0119] The fastener string row 34L passes through the fastener string passage, and the corresponding one side of the belt passes through each belt groove.

[0120] The shape of the puller main body 35a is a shape that corresponds to the fastener string passage. That is, the portion of the puller main body 35a that corresponds to the pair of branch paths is a shape that protrudes to both sides in the width direction of the fastener string row 34L compared to the portion of the puller main body 35a that corresponds to the main path.

[0121] As shown in FIG. 1, the sewing device of the first embodiment of the present application includes a work table 1, a sewing machine 2, a conveyance device 4 that conveys a work 3 while pressing the work 3 against the work table 1 from the upstream side to the downstream side with respect to the sewing machine 2, a fastener string guide 5 that is capable of positioning a fastener string row 34L of a zipper 32 of the work 3 in the width direction of the fastener string row 34L and on the upstream side of a conveyance direction X with respect to a needle 21 of the sewing machine 2 during sewing, and a guide displacement device 6 that is capable of displacing the fastener string guide 5 to a positioning position Pl at which the fastener string row 34L is positioned and a standby position P2 at which the fastener string row 34L is waited away from. Figure 1 Or Figure 3 As shown in FIG. 1, the sewing device of the first embodiment of the present application includes a work table 1, a sewing machine 2, a conveyance device 4 that conveys a work 3 while pressing the work 3 against the work table 1 from the upstream side to the downstream side with respect to the sewing machine 2, a fastener string guide 5 that is capable of positioning a fastener string row 34L of a zipper 32 of the work 3 in the width direction of the fastener string row 34L and on the upstream side of a conveyance direction X with respect to a needle 21 of the sewing machine 2 during sewing, and a guide displacement device 6 that is capable of displacing the fastener string guide 5 to a positioning position Pl at which the fastener string row 34L is positioned and a standby position P2 at which the fastener string row 34L is waited away from.

[0122] The conveyance device 4 conveys the work 3 while pressing the work 3 against the work table 1 from above one belt 33a of a pair of belts 33a, 33b and conveys the work 3 in parallel with the length direction of the fastener string row 34L of the zipper 32. Also, the other belt 33b of the pair of belts 33a and the lower cloth 30 are sewn during conveyance. Hereafter, the belt 33a of the pair of belts 33a that is pressed by the conveyance device 4 is referred to as a press side belt 33a, and the belt 33b that is sewn is referred to as a sewing side belt 33b.

[0123] Further, in the present embodiment, the conveyance device 4 includes a presser 41 that presses the presser side tape 33a from above, and a conveyer (not shown) that moves the presser 41 freely in the direction opposite to the conveyance direction X and the conveyance direction X, and freely in the up-and-down direction. The length of the presser 41 in the conveyance direction X is substantially the same as the entire length of the workpiece 3 in the conveyance direction X (the entire length of the workpiece 3 in the lengthwise direction of the tapes 33a, 33b overlaid on the cloth 30).

[0124] In the present embodiment, the upper surface of the table 1 is a horizontal plane.

[0125] The sewing machine 2 includes a sewing machine main body 2a that sews the workpiece 3, and a sewing machine presser 7.

[0126] The sewing machine main body 2a is a known structure that winds an upper thread that passes through a needle 21 and a lower thread that is supplied to the lower side of a needle hole, to form a stitch on the workpiece 3 placed on the table 1. Further, the upper thread, the lower thread, and the needle hole are not shown in the drawings. Further, in the present embodiment, the sewing machine main body 2a is a straight stitch sewing machine that forms a straight stitch S1 in the shape of a broken line on the workpiece 3 by cooperating with the conveyance device 4.

[0127] Further, the sewing machine main body 2a includes a base portion (not shown) that is disposed on the lower side with respect to the table 1, a column portion 22 that stands from the base portion, and a sewing machine head portion 23 that extends from the upper portion of the column portion 22 in a state of facing the base portion from above. Also, the sewing machine main body 2a extends in the front-and-rear direction in a state of separating the base portion and the sewing machine head portion 23 upward and downward, and the column portion 22 extends upward and downward in a state of being sandwiched by the base portion and the rear portion of the sewing machine head portion 23. Further, the front-and-rear direction refers to a direction orthogonal to the conveyance direction X and the up-and-down direction.

[0128] A mechanism that winds the lower thread and the upper thread is built in the inside of the base portion. A mechanism that links the inside mechanism of the sewing machine head portion 23 and the inside mechanism of the base portion, for example, is built in the inside of the column portion 22.

[0129] The sewing machine head portion 23 includes a sewing machine head housing (omission of reference numeral) that forms the outer contour thereof, and an inside mechanism housed in the sewing machine head housing. Further, the inside mechanism refers to a needle bar up-and-down movement mechanism, a thread tension lever driving mechanism, or a sewing machine presser driving mechanism, and the like. A link lever 23a of the sewing machine presser driving mechanism protrudes downward from the lower surface of the top portion of the sewing machine head housing. Also, fixed to the lower end portion of the link lever 23a is the sewing machine presser 7.

[0130] The presser foot 7 includes a fixed portion 71 fixed to the link lever 23a and extending downward, and a presser foot portion 72 extending from a lower end portion of the fixed portion 71 toward the upstream side in the conveyance direction X. A needle hole 72h that penetrates in the vertical direction is formed in the presser foot portion 72. In the illustrated example, two needle holes 72h are formed at intervals in the front-rear direction.

[0131] The front surface of the presser foot portion 72 is a surface facing the needle bar 34L during sewing in the width direction of the needle bar 34L. The presser foot portion 72 has a path correction surface 72b that collides with the slider 35 to correct the path of the slider 35 in the middle portion of the front surface in the conveyance direction X.

[0132] The path correction surface 72b is a shape that gradually approaches the passage of the needle bar 34L toward the downstream side in the conveyance direction X. Specifically, the path correction surface 72b is a shape that is recessed in a circular arc shape in plan view. Further, the center of the circular arc is located on the upstream side in the conveyance direction X with respect to the end point on the downstream side in the conveyance direction X among both end points of the circular arc, and is located on the passage side of the needle bar 34L with respect to the end point on the upstream side in the conveyance direction X. In addition, the circular arc is a circular arc that is obtained by approximately quartering an ellipse in the major axis direction and the minor axis direction, and is more specifically an elliptical circular arc.

[0133] The presser foot portion 72 includes, in addition to the path correction surface 72b, an induction surface 72a that induces the slider 35 toward the path correction surface 72b, and a path maintenance surface 72c that maintains the path of the slider 35 corrected by the path correction surface 72b, in the front surface.

[0134] The induction surface 72a is disposed on the upstream side in the conveyance direction X with respect to the path correction surface 72b. In addition, the induction surface 72a extends in a straight line in the conveyance direction X. More specifically, the induction surface 72a extends in a straight line in the conveyance direction X while maintaining a relationship in which the induction surface 72a coincides with a tangent line extending from the end point on the upstream side in the conveyance direction X in the circular arc of the path correction surface 72b.

[0135] The path maintenance surface 72c is disposed on the downstream side in the conveyance direction X with respect to the path correction surface 72b. In addition, the path maintenance surface 72c extends in a straight line in the conveyance direction X while maintaining a relationship in which the path maintenance surface 72c intersects with a tangent line extending from the end point on the downstream side in the conveyance direction X in the circular arc of the path correction surface 72b.

[0136] As shown in FIG. 7, the relationship between the front surface of the presser foot portion 72 (the induction surface 72a, the path correction surface 72b, and the path maintenance surface 72c) and the needle hole 72h of the presser foot portion 72 is as described below. Figure 5

[0137] ​One (front side) pinhole 72h of the two pinholes is disposed on the downstream side of the conveyance direction X with respect to the approach correction surface 72b. More specifically, two imaginary lines 72L are drawn from both ends of the pinhole 72h on the front side in a direction orthogonal to the conveyance direction X toward the upstream side of the conveyance direction X. The approach correction surface 72b is located in a region between the two imaginary lines 72L, that is, in the upstream side region 72U of the pinhole 72h. In the example illustrated, the approach correction surface 72b is partially located in the upstream side region 72U of the pinhole 72h. That is, the portion of the approach correction surface 72b on the side of the guide surface 72a is located in the upstream side region 72U of the pinhole 72h, and the portion of the approach correction surface 72b on the side of the approach maintenance surface 72c is not located in the upstream side region 72U of the pinhole 72h, but is located on the front side with respect to the upstream side region 72U of the pinhole 72h. Further, the approach maintenance surface 72c is located on the front side with respect to the upstream side region 72U of the pinhole 72h, the pinhole 72h, and the downstream side region of the pinhole 72h.

[0138] Further, as shown in Figure 1 , Figure 3 , the sewing machine head 23 is disposed in a state in which the needle bar 23b of the needle bar drive mechanism protrudes downward from the lower surface of the top of the sewing machine head housing. Also, the needle 21 is mounted to the lower end portion of the needle bar 23b in a state in which it extends downward via the fixing member 23c. In the example illustrated, two needles 21 are mounted to the fixing member 23c in a spaced-apart manner in the front-rear direction. In the width direction of the slide fastener 32, the needles 21 are preferably moved up and down in a manner as close as possible to the chain stich row 34L, although they do not come into contact with the slider main body 35a during sewing. Thereby, the stitch S1 can be formed in a manner as close as possible to the chain stich row 34L. In the width direction of the slide fastener 32, the boundary position of the stitch S1 varies depending on the thickness of the needle 21, but as shown in Figure 4 , the boundary position of the stitch S1 is the position at which the needle 21 is closest to an imaginary boundary line B drawn in parallel to the length direction of the slide fastener 32, although it does not come into contact with the imaginary boundary line B. Further, the chain stich guide 5 is capable of positioning the chain stich row 34L on the upstream side of the conveyance direction X with respect to the needle 21 of the sewing machine 2.

[0139] The chain stich guide 5 includes a guide arm 51 supported so as to be swingable in the up-down direction, and a pair of guide pieces 52 protruding from the swing end of the guide arm 51 and guiding the chain stich row 34L from both sides in the width direction. Further, the guide arm 51 is rod-shaped.

[0140] As shown in Figure 2As shown in (a), a pair of guide plates 52 can position the chain teeth 34L at positions corresponding to each other along the entire length L1 of the guide surface 72a of the sewing machine presser foot 7 in the conveying direction X, upstream of the needle 21 of the sewing machine 2. Furthermore, the pair of guide plates 52 position the chain teeth 34L with the guide arm 51 gradually tilting downwards towards the conveying direction X. Moreover, the pair of guide plates 52 protrude downwards from the lower surface of the swing end of the guide arm 51 when positioning the chain teeth 34L. The pair of guide plates 52 are arranged at intervals in the front-back direction (width direction of the chain teeth 34L). Additionally, the pair of guide plates 52 and the swing end of the guide arm 51 work together to form a guide groove 53. The guide groove 53 extends through the chain teeth 34L in the conveying direction X when positioning the chain teeth 34L. That is, a guide groove 53 is formed at the swing end of the chain tooth guide 5. The width of the guide groove 53 is slightly larger than the width of the chain tooth row 34L and the width of the second stop portion 37. In addition, the width of the guide groove 53 on the upstream side in the conveying direction X is larger than the width of the guide groove on the downstream side in the conveying direction X.

[0141] More specifically, the faces of a pair of guide plates 52 facing the tooth row 34L in the width direction of the tooth row 34L (hereinafter referred to as "facing faces") are formed parallel to the conveying direction X in the downstream portion. Furthermore, the facing face of one guide plate 52 is formed parallel to the conveying direction X along a straight line for the entire length of the conveying direction X. Therefore, the facing face of this one guide plate 52 is formed parallel to the conveying direction X not only in the downstream portion but also in the upstream portion. The upstream portion of the facing face of the other guide plate 52 is an inclined surface 52a that is inclined relative to the conveying direction X, gradually moving away from the facing face of one guide plate 52 as it moves upstream towards the conveying direction X. Furthermore, the portion of the facing faces of the pair of guide plates 52 other than the inclined surface 52a is referred to as a parallel surface 52b. The tooth guide 5, which includes such a pair of guide plates 52, is displaced by a guide displacement device 6.

[0142] like Figure 1 or Figure 3 As shown, the guide displacement device 6 includes: a shaft 61, which fixes the swing center side of the chain tooth guide 5; and a swing device 62, which supports the shaft 61 and the chain tooth guide 5 in a swingable manner with the shaft 61 as the center.

[0143] The shaft 61 is disposed in a manner spaced apart from the table 1 in the upward direction. In addition, the shaft 61 is a rod shape extending in a straight line. The direction in which the shaft 61 extends, that is, the length direction, is parallel to the front-rear direction. In addition, one end portion of the guide arm 51 is fixed to one end portion of the shaft 61. On the other hand, the swing device 62 is fixed to the other end portion of the shaft 61.

[0144] The swing device 62 converts a linear reciprocating motion into a swinging motion in the present embodiment. More specifically, the swing device 62 includes a cylinder device 63 as a linear reciprocating motion device, and a conversion device 64 that links the piston rod 63a of the cylinder device 63 and the shaft 61, and converts a linear reciprocating motion into a swinging motion.

[0145] The conversion device 64 includes a bearing portion 65 that supports the other end portion of the shaft 61 (the end portion on the side opposite the chain guide 5) in a swingable manner (in a manner rotatable by a prescribed angular range), a crank 66 that uses the shaft 61 as a crank shaft, a transmission block 67 that is fixed to the top of the piston rod 63a of the cylinder device 63, and that transmits the action of the piston rod 63a to the crank pin 66a of the crank 66, and a tension spring 68 that is stretched between the cylinder 63b of the cylinder device 63 and the crank pin 66a of the crank 66, and that causes the transmission block 67 and the crank pin 66a to engage in a linkable manner.

[0146] The cylinder device 63 includes a cylinder 63b disposed on the downstream side in the conveyance direction X with respect to the shaft 61, and a piston rod 63a that projects toward the upstream side in the conveyance direction X with respect to the cylinder 63b.

[0147] The crank 66 includes the shaft 61 that is used as a crank shaft, a crank arm 66b that is fixed to the shaft 61 in a state extending in the radial direction with respect to the shaft 61, and that causes the shaft 61 to swing, and a crank pin 66a that extends from the swinging end portion of the crank arm 66b in parallel with the shaft 61 and toward the side opposite the chain guide 5.

[0148] The surface of the transmission block 67 facing the swinging end portion of the crank arm 66b is a surface having a step in a direction orthogonal to the conveyance direction X. More specifically, in the surface of the transmission block 67 facing the swinging end portion of the crank arm 66b, the portion on the upstream side in the conveyance direction X is recessed in a stepped manner toward the direction orthogonal to the conveyance direction X (the rear direction) with respect to the portion on the downstream side in the conveyance direction X. Thus, in the transmission block 67, a stepped surface 67a is formed at the boundary between the portion on the upstream side in the conveyance direction X and the portion on the downstream side. This stepped surface 67a is a surface orthogonal to the conveyance direction X, and is a guide surface that guides the top of the crank pin 66a in a manner movable in the vertical direction.

[0149] The tension spring 68 presses the top of the crank pin 66a against the step face 67a. In addition, the tension spring 68 pushes the swing end of the chain guide 5 downward by its restoring force toward the table 1. Further, when the slider 35 passes below the swing end of the chain guide 5 while the work 3 is being conveyed, the swing end of the chain guide 5 is displaced upward against the restoring force of the tension spring 68 in a state of being pushed up by the slider 35. In addition, one end of the tension spring 68 is threaded through and clamped to a hole of the bracket 63c fixed to the cylinder 63b. The other end of the tension spring 68 is clamped to the crank pin 66a as described above.

[0150] The bearing portion 65 includes a base block 65a fixed to the table 1 and through which the shaft 61 is threaded, a collar 65b that supports the shaft 61 in a swingable manner between a through-hole (not shown) formed in the base block 65a and the shaft 61 in the lengthwise direction of the shaft 61, and a pair of flanges 65f fixed to the shaft 61 on both sides in the lengthwise direction of the shaft 61 with respect to the base block 65a.

[0151] The collar 65b includes a cylindrical collar main portion (not shown) and a collar flange portion 65d that projects in a gable-like manner from one end portion of the collar main portion in the through direction. In addition, the collar flange portion 65d is disposed between the flange 65f on the opposite side from the chain guide 5 and the base block 65a and is bolted to the base block 65a.

[0152] The flange 65f is ring-shaped and is fixed to the shaft 61 in a state of projecting to the radial direction outside with respect to the shaft 61. The crank arm 66b is bolted to the flange 65f on the chain guide 5 side.

[0153] The base block 65a extends along the conveyance direction X. In the portion of the base block 65a on the upstream side in the conveyance direction X, a through-hole is formed through which the shaft 61 is threaded together with the collar main portion as described above. In addition, the cylinder 63b of the cylinder device 63 is fixed to the portion of the base block 65a on the downstream side in the conveyance direction X. In the illustrated example, the upper surface of the portion of the base block 65a on the upstream side in the conveyance direction X is higher than the upper surface of the portion of the base block 65a on the downstream side in the conveyance direction X. In addition, between the upper surface of the portion of the base block 65a on the upstream side in the conveyance direction X and the transmission block 67, a space is provided to secure the reciprocating movement of the transmission block 67.

[0154] The sewing device of the first embodiment described above sews the work 3, for example, as described in 1) to 15) below.

[0155] 1) The work 3 is placed on the work table 1 at a prescribed position on the upstream side in the conveyance direction X of the fastener guide 5. Further, the work 3 is obtained by placing (superimposing) the fastener 32 on the cloth 30.

[0156] 2) The conveyance device 4 is driven, the pressing portion 41 is lowered, and the pressing side tape 33a of the pair of tapes 33a, 33b of the fastener 32 is pressed against the work table 1 by the pressing portion 41, and the fastener 32 and the cloth 30 are positioned.

[0157] 3) The pressing portion 41 is moved in the conveyance direction X, and the work 3 is moved in parallel with the length direction of the fastener stringer 34L of the fastener 32 while being pressed against the work table 1, and the work 3 is conveyed toward the sewing machine 2. In addition, the work 3 is conveyed while maintaining the state in which the straight portion 33S is positioned on the downstream side in the conveyance direction X with respect to the slider 35.

[0158] 4) After a prescribed time elapses from the start of the movement of the pressing portion 41 in the conveyance direction X, the sewing machine presser foot 7 is lowered from the initial position to press the work 3, and the sewing machine 2 starts sewing to form a stitch S1 in the work 3. The prescribed time is, for example, a time at which the tip end of the work 3 passes directly below the upstream side end portion in the conveyance direction X of the sewing machine presser foot 7.

[0159] 5) After a prescribed time elapses after the sewing machine presser foot 7 is lowered, the fastener guide 5 is moved from the standby position P2 to the positioning position PI, and the swinging end portion of the fastener guide 5 comes into contact with the pair of tapes 33a, 33b.

[0160] 6) When the pressing portion 41 is further moved in the conveyance direction X, the 2nd stop portion 37 on the tip end side of the fastener stringer 34L enters between the pair of guide pieces 52 of the fastener guide 5, is guided at the wide portion having the inclined surface 52a, and is then positioned by passing through between the pair of parallel surfaces 52b. By positioning the 2nd stop portion 37, the fastener stringer 34L, which is slightly narrower than the 2nd stop portion 37, is also positioned, and becomes a state in which the fastener stringer 34L is guided between the pair of guide pieces 52 after the 2nd stop portion 37 passes through the fastener guide 5. As a result, a state in which the sewing side tape 33b is also positioned is obtained, and in this state, the sewing side tape 33b and the cloth 30 are sewn, and the stitch S1 is formed in a straight line in the conveyance direction X and in a broken line shape. Further, in the illustrated example, since sewing is performed by two needles 21, two stitches S1 are formed in a side-by-side manner in the front-rear direction.

[0161] 7) When the pressing portion 41 is further continuously moved in the conveyance direction X, as Figure 2As shown in (a), the rear end of the chain tooth row 34L is close to the chain tooth guide 5, and the zipper head 35 enters the area facing the guiding surface 72a of the sewing machine presser foot 7. Furthermore, the pressing part 41 keeps the zipper 32 in its original shape (keeping the pair of straps 33a and 33b in a straight section 33S and a branch section 33T), pressing the pressing side strap 33a in a state parallel to the conveying direction X. As a result, the pressing side strap 33a is pressed in a state parallel to the straight section 33S in the downstream portion of the conveying direction X bounded by the zipper head 35, i.e., in the straight section 33S, and in a state inclined relative to the pressing side strap 33a in the upstream portion of the conveying direction X bounded by the zipper head 35, i.e., at a branch section 33T.

[0162] 8) As the pressing part 41 continues to move further in the conveying direction X, the pull head 35 overcomes the restoring force of the tension spring 68 and lifts the swing end of the chain guide 5, while passing below the swing end, such as Figure 2 As shown in (b), the zipper pull 35 collides with the path correction surface 72b, and the path of the zipper pull 35 is corrected, causing it to move forward. Furthermore, since the pressing side tape 33a is pressed against the worktable 1 by the pressing part 41 and positioned there, the path of the sewing side tape 33b near the zipper pull 35 is corrected as the zipper pull 35 moves closer to the pressing side tape 33a. Additionally, the sewing side tape 33b is sewn to the fabric 30 while its path is being corrected.

[0163] 9) As the pressing part 41 continues to move further in the conveying direction X, such as Figure 2 As shown in (c), the zipper head 35 passes through the path correction surface 72b, and the zipper head 35, after path correction, begins to move along the path maintenance surface 72c. The path of the branch portion 33T of the sewing side tape 33b is also corrected.

[0164] 10) As the pressing part 41 continues to move further in the conveying direction X, such as Figure 2 As shown in (d), the pull head 35 moves continuously along the path holding surface 72c, and the sewing side tape 33b and the fabric 30 are sewn together with the path of the branch portion 33T of the sewing side tape 33b having been corrected.

[0165] 11) As the pressing part 41 continues to move further in the conveying direction X, the pull head 35 passes through the inlet maintaining surface 72c, and the rear end of the sewn item 3 passes directly below the needle 21.

[0166] 12) After a specified time, the pressing part 41 stops moving. In addition, the sewing machine 2 stops sewing, the sewing machine presser foot 7 rises to the initial position, and the chain tooth guide 5 moves to the standby position P2.

[0167] 13) Then, the pressing portion 41 is raised and moved to the initial position.

[0168] 14) Then, the steps 1) to 13) are repeated to sew another sewn article 3.

[0169] In the sewing device of the first embodiment described above, the sewn article 3 is positioned in a state of being pressed from above the pressing side tape 33a, and the stitch line 34L is positioned by disposing the needle guide 5 at the positioning position PI, so that the sewn article 3 is sufficiently positioned, and as a result, the shape of the sewed sewing side tape 33b is approximately a straight line, compared with the sewing device in which the sewing is performed by pressing only the pressing side tape 33a.

[0170] In addition, in the sewing device of the first embodiment, the sewing machine presser foot 7 is provided with the path correction surface 72b that gradually approaches the passage of the stitch line 34L toward the downstream side in the conveyance direction X, so that the path of the slider 35 is corrected by colliding with the path correction surface 72b, and as a result, the shape of the sewing side tape 33b including the vicinity of the slider 35 and the stitch S1 are approximately a straight line, compared with the sewing device provided with the sewing machine presser foot 7 not provided with the path correction surface 72b.

[0171] In addition, in the sewing device of the first embodiment, the path correction surface 72b is recessed in a circular arc shape in plan view, and the path of the slider 35 is smoothly corrected along the circular arc, so that the shape of the sewing side tape 33b including the vicinity of the slider 35 and the stitch S1 are approximately a straight line.

[0172] In addition, in the sewing device of the first embodiment, the sewing machine presser foot 7 has the front needle hole 72h at a position that is distanced from the path correction surface 72b toward the downstream side in the conveyance direction X, so that the stitch S1 can be formed so as to approach the stitch line 34L, compared with the sewing device having the needle hole at a position distanced from the path correction surface 72b in a direction orthogonal to the conveyance direction in plan view.

[0173] In addition, in the sewing device of the first embodiment, the sewing machine presser foot 7 is provided with the path maintenance surface 72c that extends in a straight line in the conveyance direction X, so that the slider 35 whose path has been corrected is conveyed along the path maintenance surface 72c, and as a result, the path of the portion of the sewing side tape 33b on the upstream side in the conveyance direction X with respect to the slider 35, that is, the branch portion 33T is also corrected, and the shape of the sewing side tape 33b including the vicinity of the slider 35 and the stitch S1 are approximately a straight line, compared with the sewing device provided with the sewing machine presser foot 7 not provided with the path maintenance surface 72c.

[0174] Further, in the sewing apparatus of the first embodiment, the sewing machine presser foot 7 including the guide surface 72a extending in a straight line in the conveyance direction X, and thus the puller 35 is smoothly guided to the route correction surface 72b after being conveyed along the guide surface 72a, and the shape of the sewing side tape 33b including the vicinity of the puller 35 is sewn and the stitch S1 is approximated to a straight line.

[0175] Further, in the sewing apparatus of the first embodiment, the chain guide 5 is capable of positioning the chain row 34L at a position corresponding to the entire length L1 of the guide surface 72a in the conveyance direction X with respect to the needle 21 of the sewing machine 2, and thus the chain guide 5 is displaced to the standby position P2 after sewing is completed in a state in which the chain guide 5 positions the chain row 34L as close as possible to the puller 35, and thus the time difference between the end of sewing in a state in which the chain guide 5 positions the chain row 34L and the start of sewing in a state in which the sewing machine presser foot 7 corrects the route of the puller 35 using the route correction surface 72b is shortened, and the shape of the sewing side tape 33b including the vicinity of the puller 35 is sewn and the stitch S1 is approximated to a straight line compared to a sewing apparatus in which the time difference is long.

[0176] Figure 6 A sewn object 3 sewn by the sewing apparatus of the second embodiment of the present application is shown in FIG. 8. In the present embodiment, one stitch S1 is formed in the sewn object 3. That is, although not shown in the figure, in the sewing apparatus of the second embodiment, one needle is attached to the sewing machine.

[0177] The present application is not limited to the above-described embodiments, and can be appropriately changed within the scope of the gist thereof. For example, the swing apparatus converts a linear reciprocating motion into a swinging motion in the present embodiment, but in the present application, it is not limited thereto, and a motor can be used to enable the shaft 61 to rotate clockwise and counterclockwise within a predetermined angle range.

Claims

1. A sewing apparatus which takes an article obtained by loading a slide fastener (32) on a cloth (30) as a sewn article (3), while pressing the sewn article (3) from above one of a pair of tapes (33a, 33b) of the slide fastener (32) toward a worktable (1) and while conveying the sewn article (3) in parallel with the length direction of a fastener stringer (34L) of the slide fastener (32), the other of the pair of tapes (33a, 33b) and the cloth (30) are sewn by a sewing machine (2), the sewing apparatus characterized by comprising: a fastener guide (5) which is capable of positioning the fastener stringer (34L) of the slide fastener (32) in the width direction of the fastener stringer (34L) on the upstream side in the conveying direction (X) with respect to a needle (21) of the sewing machine (2) during sewing; and a guide displacement device (6) which is capable of displacing the fastener guide (5) toward a positioning position (Pl) at which the fastener stringer (34L) is positioned and a standby position (P2) at which the fastener stringer (34L) is waited for.

2. The sewing apparatus according to claim 1, characterized in that: the fastener guide (5) includes a guide arm (51) which is supported in a swingable manner in the up-and-down direction and a pair of guide pieces (52) which protrude from the swing end of the guide arm (51) and guide the fastener stringer (34L) from both sides in the width direction, the guide displacement device (6) includes a shaft (61) which fixes the swing center side of the fastener guide (5) and a swing device (62) which supports the shaft (61) together with the fastener guide (5) in a swingable manner with the shaft (61) as the center.

3. The sewing apparatus according to claim 1, characterized in that: the slide fastener (32) includes a pair of the tapes (33a, 33b) extending in a straight line shape in a straight line portion (33S) which is bordered by a slider (35) and a pair of branch portions (33T) which branch into two forks, the slide fastener (32) is conveyed in a state in which the straight line portion (33S) is located on the downstream side in the conveying direction (X) with respect to the slider (35), the sewing apparatus has a sewing machine presser foot (7) which presses the upper surface of the sewn article (3), the face of the sewing machine presser foot (7) which faces the fastener stringer (34L) in the width direction of the fastener stringer (34L) has a path correction face (72b) which corrects the path of the slider (35) upon collision with the slider (35), the path correction face (72b) gradually approaches the passage of the fastener stringer (34L) toward the downstream side in the conveying direction (X).

4. The sewing apparatus according to claim 3, characterized in that: the path correction face (72b) is recessed in a circular arc shape when viewed from above.

5. The sewing apparatus according to claim 3 or 4, characterized in that: ​ The sewing machine presser foot (7) has a needle hole (72h) on the downstream side in the conveyance direction (X) with respect to the course correction surface (72b).

6. The sewing device according to claim 3 or 4, characterized in that: The sewing machine presser foot (7) has a course maintenance surface (72c) on the downstream side in the conveyance direction (X) with respect to the course correction surface (72b), which course maintenance surface (72c) maintains the course of the slider (35) corrected by the course correction surface (72b), The course maintenance surface (72c) extends in a straight line in the conveyance direction (X).

7. The sewing device according to claim 3 or 4, characterized in that: The sewing machine presser foot (7) has an induction surface (72a) on the upstream side in the conveyance direction (X) with respect to the course correction surface (72b), which induction surface (72a) induces the slider (35) to the course correction surface (72b), The induction surface (72a) extends in a straight line in the conveyance direction (X).

8. The sewing device according to claim 7, characterized in that: The chain guide (5) is capable of positioning the chain (34L) at a corresponding position on the upstream side in the conveyance direction (X) with respect to the needle (21) of the sewing machine (2) and in the range of the entire length (LI) of the induction surface (72a) in the conveyance direction (X).

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