CN208038716U - Double-strand seam sewing machine - Google Patents

Abstract

The utility model is provided for the bending part with bending and at least part is across the opposed decorative trim member of the crest line of bending part, can make the double-strand seam sewing machine that the height dimension in the engine base portion being inserted between the opposed faces up and down of decorative trim member is smaller than previous sewing machine.By including base portion (12a) and needle tip (12b, 12b) with the looper 12 for cooperatively forming stitch of needle (6,6).Needle tip (12b, 12b) extends from base portion (12a) along a direction respectively, is configured along horizontal and front-rear direction.Base portion (12a) and one end of the looper platform (13) configured in the lower section of needle plate (7) link.The other end of looper platform (13) extended to the right from one end links with looper platform driving mechanism (14).By the driving of looper platform driving mechanism (14), the rotation of looper platform (13) and looper (12) and main shaft (5) linkedly swings in horizontal plane and moves forward and backward along the longitudinal direction in left-right direction.

Description

Double-strand seam sewing machine

Technical field

The utility model is related to the double-strand seam sewing machines for vehicle decorative trim member.

In the present invention, it is front and back refer to vehicle decorative trim member direction of feed (hereinafter referred to as direction of feed) on Front-rear direction, left and right refers to left and right directions when being observed from the front sewing machine.In addition, referring to the upper and lower of sewing machine up and down To.

Background technology

In the past, to decorative trim members (hereinafter referred to as interior trim structures such as the instrument board, the door trims that are equipped in the compartment of motor vehicle Part) implement as the needle tracking decorated.The needle tracking is generally flush joint stitch, usually used as the sewing machine for being used to form needle tracking The sewing machine for covering chain stitch of column, cartridge type.

The baseline of sewing machine for covering chain stitch supplies by spool, therefore the strip as decorative trim member is sewn component in sewing When, the amount for being wound in the baseline of spool is less, therefore must not infrequently carry out spool replacement, thus there is productivity and significantly drops Low problem.

In addition, flush joint stitch is not formed as linear, a high-grade sense there is also slightly shortcoming as decoration strictly The problem of.That is, during forming stitch by sewing machine for covering chain stitch, the needle tracking of one needle of a needle relative to be sewn component into It is obliquely connected to direction, therefore aesthetics is deteriorated.

Therefore, in recent years, as the decoration for decorative trim member, attracted attention by the needle tracking that chain stitch machine is formed.? In chain stitch machine, the supply of baseline does not need spool, and the needle tracking of one needle of a needle is put down with the direction of feed for being sewn component Row, needle tracking is integrally formed into one linearly, it is thus eliminated that above-mentioned led to the problem of by sewing machine for covering chain stitch.

In addition, in recent years, the shape of decorative trim member, the diversified development of appearance design, it is also proposed that by previous Column, cartridge type sewing machine be difficult to the position sewed implement needle tracking as appearance design.One as above-mentioned appearance design Example, can be listed below appearance design：There are bending part made of making decorative trim member bend, at least part of decorative trim member Crest line across bending part is opposed, to the side in the opposed face of the decorative trim member, be implemented with along crest line near crest line Needle tracking.When implementing the needle tracking of above-mentioned example by sewing machine, side's direction in the opposed face for making above-mentioned decorative trim member is needed The engine base portion of sewing machine configured with looper, spool is inserted between the opposed faces up and down of decorative trim member, and makes engine base by top The underface for falling needle portion and reaching the position of needle tracking to be implemented in portion.So, for known general column Necessarily engine base can not be arranged in desirable position, in addition for previous cartridge type due to its engine base shape for sewing machine Sewing machine, if the height dimension of cylinder base part is more than the interval of the opposed faces up and down of above-mentioned decorative trim member (on hereinafter referred to as Lower width), then engine base can not be also arranged in desirable position.

Sewing machine as the needle tracking for implementing above-mentioned appearance design example, it is proposed that make the front end side Yan Shui of column engine base Square to extension sewing machine (for example, referring to patent document 1).The sewing machine of patent document 1 is the chain stitch machine of column, Uprights are in the shape that front end horizontally extends to the right, are fixed in the right side upper surface of the uprights front end horizontally extended Have with the needle plate (not shown) for falling needle portion.When the decorative trim member to above-mentioned example implements needle tracking, make the crest line of the bending part Uprights front end is inserted into and is arranged described up and down between opposed faces towards right side by (vertex), later, drive sewing machine and Decorative trim member is sent out to horizontal rear by sewed by well known feed mechanism.

In the sewing machine of embodiment recorded in patent document 1, using have rotation looper or deviate looper it is curved Needle mechanism.In the example using rotation looper, rotation looper, which is installed on the front end of rotary shaft and is configured at, to be fallen under needle portion Side, rotary shaft configure in uprights front end along the extending direction of the uprights front end.

In the example using offset looper, extend under being in the form of a column ground and under the bottom of uprights that is formed is configured with Axis is configured with looper arm in uprights.Looper arm is formed extended at both sides up and down, and cardinal extremity and the lower axle of looper arm link, in looper arm Front end installation offset looper.Offset looper is formed in such a way that a part extends to the right, and before being configured at uprights End.Moreover, when driving sewing machine, looper swing together with looper arm using lower axle as rotation center is deviated.

Citation

Patent document

Patent document 1：Japanese Unexamined Patent Application Publication 2014-520602 (Fig. 1,4,5)

In the sewing machine of patent document 1, rotation looper is rotated around trunnion axis, offset looper around positioned at from upper and lower The rotary shaft of the position detached on direction is swung, therefore above-mentioned looper generates the displacement of upper and lower directions when driving sewing machine.Cause This, the uprights front end for accommodating above-mentioned looper needs the height dimension with the displacement for only allowing above-mentioned upper and lower directions.Therefore, If the width up and down of bending part narrows in the decorative trim member of above-mentioned appearance design example, even if in the sewing machine of patent document 1 In also can not by uprights front end be arranged in defined position, thus in the presence of can not implement desirable needle tracking the case where.

Utility model content

Therefore, the project of the utility model is to provide a kind of double-strand seam sewing machine, which can be to upper State appearance design example decorative trim member, i.e. have bending bending part and at least part across the crest line of bending part it is opposed in Component is adornd, forms needle tracking along crest line near a side in the opposed face of the decorative trim member and crest line, and can make to insert The height dimension entered to the engine base portion between the opposed faces up and down of decorative trim member is smaller than previous sewing machine.

Means for solving the problems

In order to achieve the above object, the double-strand seam sewing machine of the utility model involved by technical solution 1 is characterized in that, tool It is standby：Arm and engine base, the arm and engine base constitute the shell of sewing machine；Main shaft is supported on institute in a manner of it can rotate State engine base；Needle bar is supported on the arm in a manner of it can move up and down；Needle, is installed on the lower end of the needle bar, and with The rotation of the main shaft linkedly moves up and down；Needle plate bracket, cardinal extremity are fixed on the engine base, extend from cardinal extremity to side Front end is located at the lower section of arm；Needle plate, is fixed on the front end of the needle plate bracket, and is provided with and is supplied when the needle moves up and down The needle falling hole that the needle passes through；Looper platform driving mechanism is configured at the engine base and links with the main shaft, with the master The rotation of axis is linkedly driven；Looper platform, one end are located at the lower section of the needle plate, another extending from one end to side One end is linked with the looper platform driving mechanism；And looper, stitch is formed by the cooperation with the needle, the looper Including base portion and needle tip, one end of the base portion and the looper platform links, from the base portion to described in the extension of a direction Needle tip configures in the horizontal direction and along the longitudinal direction, and the rotation of the looper platform and the looper and the main shaft interlocks Ground swings and moves forward and backward along the longitudinal direction in left-right direction in the horizontal plane.

The utility model of technical solution 2 is based on the double-strand seam sewing machine of technical solution 1, which is characterized in that described curved Needle platform driving mechanism has：Action movie is fixed on the other end of the looper platform；Mechanism is moved forward and backward, with the action Piece links, and the looper platform is made to move along the longitudinal direction；And side-to-side movement mechanism, link with the action movie, makes described Looper platform moves in left-right direction.

The utility model of technical solution 3 is based on the double-strand seam sewing machine of technical solution 2, which is characterized in that before described Motion is acted by being fixed on the effect for moving forward and backward cam of the main shaft afterwards, and the side-to-side movement mechanism passes through solid It is acted due to the effect of the side-to-side movement cam of the main shaft.

Utility model effect

Double-strand seam sewing machine according to the present utility model, when driving looper, which does not generate the displacement of upper and lower directions, Therefore the height dimension of engine base can be made smaller than known chain stitch machine, as a result, even by known chain Also the engine base of sewing machine can be arranged in defined position for the decorative trim member for the narrower width up and down that seam sewing machine can not sew It sets.In addition, looper swings and moves forward and backward along the longitudinal direction in left-right direction in the horizontal plane, therefore can be to decorative trim member Bending part opposed face a side, sewed along crest line near the crest line of bending part.

Description of the drawings

Fig. 1 is the summary front view of the double-strand seam sewing machine involved by the utility model.

Fig. 2 is the amplification stereogram for the major part for showing the sewing machine.

Fig. 3 is the vertical view for the looper progressive position for showing the sewing machine.

Fig. 4 is the vertical view for the looper going-back position for showing the sewing machine.

Fig. 5 is the vertical view of the major part for the looper platform driving mechanism for showing the sewing machine.

Fig. 6 be show the main shaft angle of the sewing machine with motion cam around, around movement Slave Block with And the synoptic diagram of the position relationship of each connecting rod.

Fig. 7 is the main shaft angle and needle, the synoptic diagram of the position relationship of looper for showing the sewing machine, and (a) of Fig. 7 is left view (b) of figure and Fig. 7 are vertical views.

Fig. 8 is the summary front view of the major part during showing the sewing of the sewing machine.

Reference sign

1 double-strand seam sewing machine；

2 arms；

3 engine bases；

3a engine base lids；

5 main shafts；

6,6 needle；

7 needle plates；

9 needle plate brackets；

12 loopers；

13 looper platforms；

14 looper platform driving mechanisms；

15 inner covers；

16 action movies；

19 move forward and backward mechanism；

20 move forward and backward cam；

21 move forward and backward Slave Block；

27 side-to-side movement mechanisms；

30 side-to-side movement cams；

31 side-to-side movement Slave Blocks；

35 square blocks；

F directions of feed.

Specific implementation mode

Hereinafter, being illustrated to the double-strand seam sewing machine of the embodiment of the utility model by attached drawing.

Fig. 1 is the summary front view of double-strand seam sewing machine, and Fig. 2 is that the amplification for the major part for showing the sewing machine is three-dimensional Figure.Double-strand seam sewing machine 1 has the arm 2 and engine base 3 for the shell for constituting sewing machine.Engine base 3 is set in a manner of horizontally extending It sets, main shaft 5 is supported on engine base 3 in a manner of it can be rotated around axle center.In the upper surface of engine base 3 installation organic block lid 3a.In machine The upper surface of the one end of the left and right directions of seat 3 erects the column portion 2a for having arm 2, and arm 2 is from column portion 2a to the extending direction with engine base 3 Parallel and identical direction extends.In addition, arm 2 is longer in the lateral direction compared with engine base 3.Lower section in 2 front end of arm, needle bar 10 are supported on arm 2 in a manner of it can move up and down.Two needles 6,6 of left-right situs setting are installed in the lower end of needle bar 10. Needle bar 10 and the well known needle bar driving mechanism (not shown) being configured in arm 2 link, and needle bar driving mechanism links with main shaft 5. Moreover, needle bar 10 and needle 6,6 and the rotation of main shaft 5 linkedly move up and down.

It is configured with needle plate 7 in the lower section of needle 6,6.Needle plate 7 links via needle plate bracket 9 with engine base 3.Needle plate bracket 9 Cardinal extremity is fixed on the left side of engine base 3 by screw 8.Needle plate bracket 9 from cardinal extremity to side (left) to extend to 2 front end of arm The mode of lower section is formed, and needle plate 7 is fixedly arranged at the front end in needle plate bracket 9.It is provided in needle plate 7 and is supplied when needle 6,6 moves up and down Needle falling hole 7a, 7a that needle 6,6 passes through.The height dimension of preferred pin board bracket 9 is very small near its fore-end.It needs to illustrate , do not have a feed mechanism in the lower section of needle plate 7, decorative trim member by well known to being set to outside needle plate 7 into It is fed to the rear of sewing machine along direction of feed F to mechanism.

In the lower section of needle plate 7 configured with the looper 12 for forming stitch by the cooperation with needle 6,6.Looper 12 includes base portion 12a and needle tip 12b, 12b.Needle tip 12b, 12b extend from base portion 12a along a direction respectively, along horizontal and front-rear direction Configuration.In the present embodiment, needle tip 12b, 12b is configured in a manner of extending from base portion 12a to nearby side.Base portion 12a with One end connection of the looper platform 13 of the lower section configuration of needle plate 7.The other end of looper platform 13 extended from one end to side (right) Link with looper platform driving mechanism 14.By the driving of aftermentioned looper platform driving mechanism 14, looper platform 13 and looper 12 with The rotation of main shaft 5 linkedly, is swung in left-right direction in the horizontal plane, and is moved forward and backward along the longitudinal direction.It needs to illustrate It is that preferably the height dimension near the left end portion of looper 12, looper platform 13 is very small.

Fig. 3 is the vertical view for showing looper progressive position, and Fig. 4 is the vertical view for showing looper going-back position.It needs to illustrate , Fig. 3 and Fig. 4 show the state after engine base lid is removed.Inner cover 15 is configured to the part in covering engine base 3, and solid Due to engine base 3.Left-right situs setting in interval as defined in being separated on the main shaft 5 for being supported on engine base 3 in a manner of it can rotate is simultaneously It is fixed with and moves forward and backward cam 20 and side-to-side movement cam 30.Cam 20 and side-to-side movement cam 30 are moved forward and backward mutually right The face set is respectively provided with cam surface 20a and cam surface 30a.Moreover, there is reference plane 20aa in cam surface 20a and from reference plane 20aa concave acting surface 20ab to the right.In addition, cam surface 30a have reference plane 30aa and from reference plane 30aa to the left The concave acting surface 30ab in side.

Looper platform driving mechanism 14 has：Action movie 16 is fixed on the other end of looper platform 13；Move forward and backward mechanism 19, link with action movie 16, and looper platform 13 is made to move along the longitudinal direction；And side-to-side movement mechanism 27, with action movie 16 connections, and looper platform 13 is made to move in left-right direction.It moves forward and backward mechanism 19 and passes through the work above-mentioned for moving forward and backward cam 20 With and act, side-to-side movement mechanism 27 is acted by the effect of side-to-side movement cam 30 above-mentioned.Hereinafter, to the machine of moving forward and backward Structure 19 and side-to-side movement mechanism 27 illustrate.

First, the primary structure for moving forward and backward mechanism 19 is illustrated.

It moves forward and backward Slave Block 21 and is formed as cylindric, and the part for being configured to its circumference side passes through helical spring 40 And it is crimped on cam surface 20a.One end of connecting rod 22 by screw 23a by can mutually around the longitudinal axis rotate in a manner of with move forward and backward The upper surface of Slave Block 21 links.Connecting rod 22 is formed as L letter stencil shapes, and positioned at the lower section of inner cover 15.In addition, connecting rod 22 with The above-mentioned linking portion for moving forward and backward the connection of Slave Block 21 exposes from inner cover 15, and part in addition to this is covered by inner cover 15. Connecting rod 22 is linked by screw 23b with the lower surface of inner cover 15 in the corner part of L words.Moreover, connecting rod 22 can be around with spiral shell Follow closely the axis swing centered on 23b.One end of connecting rod 24 links by the other end of screw 23c and connecting rod 22.Connecting rod 24 is formed as Rectilinear plate.The other end of connecting rod 24 pass through up and down the hole 15a of inner cover 15 and by screw 23d and with the base of action movie 16 End connection.Action movie 16 forms configuration in a manner of extending to the left from cardinal extremity, is fixed with by screw 17,17 in its front end curved The other end of needle platform 13.

Next, being illustrated to the primary structure of side-to-side movement mechanism 27.

Side-to-side movement Slave Block 31 is formed as cylindric, and the part for being configured to its circumference side passes through helical spring 40 And it is crimped on cam surface 30a.One end of connecting rod 32 by screw 33a by can mutually around the longitudinal axis rotate in a manner of and side-to-side movement The upper surface of Slave Block 31 links.Connecting rod 32 is formed as rectilinear plate, and positioned at the lower section of inner cover 15.Connecting rod 32 with it is above-mentioned Side-to-side movement Slave Block 31 link linking portion from inner cover 15 expose, part in addition to this is covered by inner cover 15.Connecting rod 32 link by midway portion is by screw 33b with the lower surface of inner cover 15.Moreover, connecting rod 32 can be in being with screw 33b The axis of the heart is swung.It is respectively formed with the slot hole 16b that left and right extends and a part backward in the midway of the left and right directions of action movie 16 Protrusion 16a made of side is prominent.The other end of connecting rod 32 pass through up and down the hole 15b of inner cover 15 and by screw 33d and Link with the protruding portion 16a of action movie 16.Intercalation has square block in a manner of sliding contact in the slot hole 16b of action movie 16 35.By guiding square block 35 in slot hole 16b, to which action movie 16 can move in the range of slot hole 16b.In square block 35 upper surface is configured with pressing plate 36, and a part and the square block 35 of action movie 16 are pressed plate 36 and the clamping of inner cover 15.Spiral shell Nail 37 passes through pressing plate 36 and square block 35, pressing plate 36 to be fixed on inner cover 15 by screw 37.By inner cover 15 and pressing plate 36 The square block 35 of clamping can be rotated with screw 37 for center of rotation.

As shown in figure 5, helical spring 40 is folded between connecting rod 22 and connecting rod 32.In one end of connecting rod 22 and connecting rod 32 Opposed side is fixed with disk-shaped washer 28 by pin 29, and the side opposed with connecting rod 22 in one end of connecting rod 32 is logical It crosses pin 39 and is fixed with disk-shaped washer 38.Pin 29 and pin 39 have extended to form axle portion in mutually opposed side, Two axle portions are separately installed with the both ends of helical spring 40.Washer 28,38 is set as the outer diameter that outer diameter is more than helical spring 40, spiral Spring 40 presses washer 28,38.By above structure, moves forward and backward Slave Block 21 and be crimped on always and move forward and backward cam 20 Cam surface 20a, side-to-side movement Slave Block 31 is crimped on the cam surface 30a of side-to-side movement cam 30 always.

In addition, one end of helical spring 42 is fixed with by screw 41a near the screw 23b of 15 upper surface of inner cover. The other end of helical spring 42 is fixed on one end of looper platform 13 by screw 41b, and helical spring 42 is curved to be pulled to right back The mode of needle platform 13 plays a role.

Also, the medial surface of the left back in engine base 3 is fixed with one end of helical spring 44 by screw 43a.Spiral shell The other end of rotation spring 44 is fixed on one end of looper platform 13 by screw 43b, and helical spring 44 is rearward to pull looper platform 13 mode plays a role.

The driving of the looper platform driving mechanism 14 constituted as described above is illustrated below.First, when main shaft 5 rotates When, it moves forward and backward cam 20 and side-to-side movement cam 30 and is rotated around the axle center of main shaft 5, move forward and backward Slave Block 21 with front and back The rotation of motion cam 20 and rotated around the longitudinal axis, and along the reference plane 20aa or acting surface 20ab or so of cam surface 20a It swings.Moreover, connecting rod 22 is with moving forward and backward swinging and being put using screw 23b as oscillation center for Slave Block 21 It is dynamic, to which connecting rod 24 is substantially moved forward and backward.In addition, side-to-side movement Slave Block 31 with the rotation of side-to-side movement cam 30 and It rotates around the longitudinal axis, and swings along the reference plane 30aa or acting surface 30ab of cam surface 30a.Moreover, connecting rod 32 with Swinging and being swung using screw 33b as oscillation center for side-to-side movement Slave Block 31.With above-mentioned connecting rod 24, 32 swing, action movie 16 by slot hole 16b square block 35 guide and swing, and centered on screw 37 and around Longitudinal axis rotary oscillation.Pass through the above-mentioned driving of action movie 16, the rotation of the other end and looper 12 and main shaft 5 of looper platform 13 Linkedly, it swings and is moved forward and backward along the longitudinal direction in left-right direction in the horizontal plane.

Fig. 6 be show when main shaft 5 is in a certain shaft angle degree (hereinafter referred to as main shaft angle) around motion cam, Slave Block and the figure with the position relationship of the connecting rod of two Slave Blocks connection are moved around, and Fig. 7 is to show a certain spindle angular (a) left view of the position relationship of needle and looper under degree and (b) vertical view.Fig. 6 and Fig. 7 be omitted a part of structure with And the synoptic diagram of reference numeral, the side in the needle tip of pair of right and left needle, looper is only shown in the figure 7.In addition, referred to herein Main shaft angle refer to, as 0 ° when needle is in top dead centre, when sewing machine drives main shaft rotate single direction of rotation on, Show that main shaft is located at the angle for having rotated the position how much spent in the range of 0 °~360 °.

When main shaft angle is 0 °, moves forward and backward Slave Block 21 and engage with the reference plane 20aa for moving forward and backward cam 20.This When, the one end for moving forward and backward Slave Block 21 and connecting rod 22 is located at each left stop to swing in range, connecting rod 24 and The cardinal extremity of action movie 16 is located at the rear stop in front and back hunting range.On the other hand, the looper platform 13 linked with action movie 16 Front end be located at the preceding stop (with reference to Fig. 3) in front and back hunting range.

In addition, side-to-side movement Slave Block 31 engages with the reference plane 30aa of side-to-side movement cam 30.Side-to-side movement Slave Block 31 and one end of connecting rod 32 be located at each right stop to swing in range, the action movie 16 that links with connecting rod 32 and with The looper platform 13 that action movie 16 links is located at the left stop in the hunting range of left and right (with reference to Fig. 3).

Moreover, as shown in fig. 7, needle 6 is located at top dead centre, looper 12 is located at preceding stop, the needle tip 12b of looper 12 be located at The left side of its needle 6 engaged.

During making main shaft 5 from 0 ° of main shaft angle rotation to 90 ° of main shaft angle, move forward and backward Slave Block 21 with it is front and back The acting surface 20ab engagings of motion cam 20, to itself be rotated centered on screw 23a, and are moved to the right.Then, Connecting rod 22 is rotated centered on screw 23b when viewed from above clockwise, is linked with connecting rod 22 via connecting rod 24 The cardinal extremity of action movie 16 rotated clockwise when viewed from above centered on screw 37.At this point, spring 44 with to The mode that rear pulls one end of the looper platform 13 linked with action movie 16 plays a role, therefore can swimmingly carry out above-mentioned The rotation of action movie 16.

In addition, side-to-side movement Slave Block 31 engages with the acting surface 30ab of side-to-side movement cam 30, to which itself is with screw It rotates centered on 33a, and moves to the left.Then, connecting rod 32 when viewed from above by centered on screw 33b and to inverse Clockwise rotates, and action movie 16 is guided and moved to the right by the square block 35 in slot hole 16b.At this point, spring 42 with to The mode that rear pulls one end of the looper platform 13 linked with action movie 16 plays a role, therefore can swimmingly carry out above-mentioned The movement of action movie 16.

By the effect of two cam 20,30 described above, during main shaft angle is from 0 ° to 90 °, action movie 16 It is rotated clockwise when viewed from above centered on screw 37 with the looper platform 13 that links with action movie 16, and to It moves right.At this point, needle 6 declines from top dead centre, the needle tip 12b of looper 12 is from the left side of the needle 6 engaged with it sidesway to the right It moves and rearward retreats.Moreover, when main shaft angle is 90 °, the front end of needle 6 is located at the lower section of looper 12, and looper 12 is located at The right stop to swing in range.

When main shaft angle is 180 °, moves forward and backward Slave Block 21 and persistently block with the acting surface 20ab for moving forward and backward cam 20 It closes.Acting surface 20ab is in the rightmost side of its left and right position, and therefore, the one end for moving forward and backward Slave Block 21 and connecting rod 22 is located at The right stop to swing in range, the cardinal extremity of action movie 16 are respectively positioned on swing range with the connecting rod 24 for being linked to connecting rod 22 Interior preceding stop.On the other hand, with action movie 16 link looper platform 13 front end be located in front and back hunting range it is rear stop Point (with reference to Fig. 4).

In addition, side-to-side movement Slave Block 31 engages with the reference plane 30aa of side-to-side movement cam 30.Moreover, side-to-side movement from One end of motion block 31 and connecting rod 32 is located at the right stop to swing in range, the action movie linked with the other end of connecting rod 32 16 are located at the left stop in the hunting range of left and right (with reference to Fig. 4).

At this point, needle 6 is located at lower dead center, looper 12 is located at rear stop, and the needle tip 12b of looper 12 is located at and engages with it Needle 6 left side.

During making main shaft 5 from 180 ° of main shaft angle rotation to 225 ° of main shaft angle, move forward and backward Slave Block 21 with The acting surface 20ab for moving forward and backward cam 20 persistently engages, and is gradually moved to the left with the left and right position of acting surface 20ab, preceding Movement Slave Block 21 itself is rotated centered on screw 23a afterwards, and is moved to the left.Then, when viewed from above, even Bar 22 is rotated counterclockwise centered on screw 23b, the cardinal extremity of the action movie 16 linked with connecting rod 22 via connecting rod 24 It is rotated counterclockwise when viewed from above centered on screw 37.

In addition, side-to-side movement Slave Block 31 engages with the reference plane 30aa of side-to-side movement cam 30.Side-to-side movement Slave Block 31 and one end of connecting rod 32 be maintained at the right stop to swing in range, be located at left and right with the action movie 16 that connecting rod 32 links Hunting range in left stop.

By the effect of two cam described above, action movie 16 and the looper platform 13 linked with action movie 16 with screw 37 Centered on rotated counterclockwise when viewed from above.At this point, needle 6 rises from lower dead center, the needle tip 12b of looper 12 exists Advance forwards in the left side of the needle 6 engaged with it.Moreover, looper 12 needle tip 12b in needle 6 when passing on left, looper 12 capture the needlework coil (not shown) generated by the rising of needle 6.

When main shaft angle is 270 °, moves forward and backward Slave Block 21 and engage with the reference plane 20aa for moving forward and backward cam 20. The one end for moving forward and backward Slave Block 21 and connecting rod 22 is located at the left stop to swing in range.The cardinal extremity of action movie 16 and company The connecting rod 24 for being connected to connecting rod 22 is respectively positioned on rear stop in front and back hunting range.On the other hand, link with action movie 16 curved The front end of needle platform 13 is located at the preceding stop in front and back hunting range.

In addition, side-to-side movement Slave Block 31 engages with the reference plane 30aa of side-to-side movement cam 30.Side-to-side movement Slave Block 31 and one end of connecting rod 32 be located at the right stop that swings in range, be located at left and right with the action movie 16 that connecting rod 32 links Left stop in hunting range.

At this point, needle 6 is in rising, the needle tip 12b of looper 12 is located at preceding stop and positioned at the needle 6 than engaging with it Position by left side.

Making main shaft angle, from during marching to 360 ° for 270 °, looper 12 is stationary, and only needle 6 continues to rise.

As described above, in the double-strand seam sewing machine 1 of the present embodiment, as decorative trim member 47, have along direction of feed F There is bending part, at least part of decorative trim member 47 is opposed across the crest line of bending part, can be to the opposed of the decorative trim member 47 Face a side and crest line near sewed along crest line.Also, it according to the double-strand seam sewing machine 1 of the present embodiment, is driving When dynamic looper 12, looper 12 does not generate the displacement of upper and lower directions, therefore the height dimension of engine base can be made than known ring Seam sewing machine is small, even the width up and down that can not be sewed as shown in Figure 8 by known ring seam sewing machine as a result, Relatively narrow decorative trim member decorative trim member 47 can be also arranged in the defined position of double-strand seam sewing machine 1.In addition, looper 12 It swings and is moved forward and backward along the longitudinal direction in left-right direction in the horizontal plane, therefore can be to the bending part of decorative trim member 47 It is sewed along crest line near one side in opposed face and the crest line of bending part.

It should be noted that in the double-strand seam sewing machine 1 of the embodiments of the present invention, two needle double-strand seams are instantiated Sewing machine, but in addition to this for example a needle, three needles double-strand seam sewing machine in can also play the same role effect. The utility model is not limited to embodiments illustrated above, without departing from the purport of the utility model, then can play and implement The same effect of example.

Claims (3)

1. a kind of double-strand seam sewing machine, which is characterized in that have：

Arm and engine base, the arm and engine base constitute the shell of sewing machine；

Main shaft is supported on the engine base in a manner of it can rotate；

Needle bar is supported on the arm in a manner of it can move up and down；

Needle is installed on the lower end of the needle bar, and linkedly moves up and down with the rotation of the main shaft；

Needle plate bracket, cardinal extremity are fixed on the engine base, and the front end extended from cardinal extremity to side is located at the lower section of arm；

Needle plate, be fixed on the front end of the needle plate bracket, and is provided with and is passed through for the needle when the needle moves up and down Needle falling hole；

Looper platform driving mechanism is configured at the engine base and links with the main shaft, and the rotation with the main shaft is linkedly It is driven；

Looper platform, one end are located at the lower section of the needle plate, and the looper is linked in the other end extended from one end to side Platform driving mechanism；And

Looper forms stitch by the cooperation with the needle,

The looper includes base portion and needle tip,

One end of the base portion and the looper platform links,

The needle tip extended from the base portion to a direction configures in the horizontal direction and along the longitudinal direction,

The rotation of the looper platform and the looper and the main shaft linkedly swing in left-right direction in the horizontal plane and It moves forward and backward along the longitudinal direction.

2. double-strand seam sewing machine according to claim 1, wherein

The looper platform driving mechanism has：

Action movie is fixed on the other end of the looper platform；

Mechanism is moved forward and backward, links with the action movie, the looper platform is made to move along the longitudinal direction；And

Side-to-side movement mechanism links with the action movie, the looper platform is made to move in left-right direction.

3. double-strand seam sewing machine according to claim 2, wherein

The mechanism that moves forward and backward is acted by being fixed on the effect for moving forward and backward cam of the main shaft,

It is acted by the effect of side-to-side movement cam of the side-to-side movement mechanism by being fixed on the main shaft.