CN1904182B

CN1904182B - Bobbin thread holding device for seamer

Info

Publication number: CN1904182B
Application number: CN200610107453XA
Authority: CN
Inventors: 三须伸介
Original assignee: Juki Corp
Current assignee: Juki Corp
Priority date: 2005-07-27
Filing date: 2006-07-25
Publication date: 2011-07-27
Anticipated expiration: 2026-07-25
Also published as: KR20070014047A; KR101317435B1; TW200714770A; JP2007029437A; JP4707489B2; CN1904182A; TWI351455B

Abstract

The invention satisfactorily carrys out nex sewing after cutting off a looper. A shuttle mechanism 50 for a sewing machine is provided with: a bobbin case 51 for housing a bobbin 56 of a looper D; an inner shuttle 52 which is turned reciprocatively around the bobbin case; a large shuttle 54 which holds the inner shuttle inside in a reciprocatively rotatable state; and a thread guide plate 60 arranged at the upper part of the large shuttle. The shuttle mechanism 50 is arranged under a thread cutting device within a sewing machine head part 21. The thread guide plate is provided with a bobbin thread holding part 67 for catching the bobbin thread cleared away by a moving knife 14 of a thread cutting device, and the bobbin thread holding part is positioned in the vicinity of the bobbin thread guide-out part of the bobbin case compared with a bobbin thread pass-through position P in the case of sewing to the thread guide plate.

Description

The bottom line holding device of Sewing machines

Technical field

The present invention relates to below needle plate, keep by the bottom line holding device of the Sewing machines of the bobbin thread of trimming.

Background technology

In the past, known had a Sewing machines that has disposed rotating shuttle device, and this rotating shuttle device is by the shuttle box of taking in the shuttle of bottom line; The middle rotating shuttle that around the shuttle box, back and forth rotates; With can make in rotating shuttle back and forth rotate and middle rotating shuttle embraced around the big rotating shuttle of inboard and constitute.Be known in this Sewing machines, above the downside of the needle plate of Sewing machines base plate and described rotating shuttle device, be provided with cutting facility, and then, configuration wired guide plate (for example, with reference to patent documentation 1) between this cutting facility and described big rotating shuttle.The bottom line maintaining part of the end of the bottom line that on this line guide plate, is formed with pilot hole and is used to keep cut off by cutting facility.

In having the structure of above-mentioned guide plate, when making, if eedle drops to the inboard of the pilot hole that is formed at described line guide plate, then be located at the sharp sword of described middle rotating shuttle and catch upper thread, and then the wire loop of upper thread is stretched to the below of middle rotating shuttle corresponding to the rotation of rotating shuttle in described.If described sharp sword turns to a little by the position under the rotation of rotating shuttle in described, then described in rotating shuttle counter steer counter-rotation, upper thread is decontroled from described sharp sword.If pulled by balance at this moment upper thread, rotating shuttle passes and the wire loop of pull-up upper thread in then making.Thus, the bottom line of extracting out from the shuttle box of the inboard that is arranged in rotating shuttle will pass the wire loop of upper thread, form knotting thus, carry out making of flush joint.

The shape that is formed at the pilot hole of described line guide plate forms: the wire loop of described upper thread by in rotating shuttle when stretching downwards, make the upper thread shape that acts on dividually of side and downstream upstream across sharp sword path.In other words, thus, during upper thread can not be clamped between rotating shuttle and the big rotating shuttle but carry out wire loop formation.

Above-mentioned cutting facility have rotation movable cutting knife, with this movable cutting knife clamping line and the fixed cutting tool that cuts off, the bottom line maintaining part forms at the structure by movable cutting knife seizure bottom line when fixed cutting tool is carried bottom line.

In other words, after the sewing finishing, when cutting off bottom line,, when making, can not need the adjustment (setting) of bottom line by catch the cut-out end of bottom line by the bottom line maintaining part of line guide plate by cutting facility next time.

[patent documentation 1] Japanese kokai publication hei 8-10484 number

Yet, the bottom line maintaining part of the line guide plate of above-mentioned rotary shuttle mechanism is formed on the position of extracting the position away from the bottom line of shuttle box out, and there are the following problems: during bottom line is transported to the bottom line maintaining part by described movable cutting knife mobile, bottom line extracts out redundantly from shuttle.

Thus, when making, the unfavorable condition that line tension reduces, can not form knotting well appears next time.

Summary of the invention

The object of the invention is to carry out well bottom line after cutting off making next time.

The structure that first invention is adopted is, the bottom line holding device of Sewing machines comprises: rotating shuttle device, its have the shuttle of taking in bottom line the shuttle box, the middle rotating shuttle that back and forth rotates around the described shuttle box and can make described in rotating shuttle back and forth rotate and the big rotating shuttle of rotating shuttle in the inboard maintenance is described; Cutting facility, it is by moving the top that bottom line is configured in rotating shuttle device; With the line guide plate, it is configured in the top of described big rotating shuttle, and be provided with the bottom line maintaining part, described bottom line maintaining part is caught bottom line when the movable cutting knife of described cutting facility mobile, wherein, the bottom line when making is compared by the position, near the described bottom line maintaining part of the configuration bottom line leading-out portion of more close described shuttle box, described rotating shuttle device has the described line guide plate that is provided with described bottom line maintaining part, and described shuttle box has the bottom line leading-out portion.

In addition, " the bottom line leading-out portion of shuttle box " be meant, has at the shuttle box under the situation of guide of the thread path of determining the bottom line of deriving, removes the part of the constraint of bottom line from this guide.

The structure that second invention is adopted is, have and the identical structure of first invention, and above the bottom line leading-out portion of shuttle box configuration bottom line maintaining part.

First invention is being extracted out from the shuttle box under the state of bottom line, and middle rotating shuttle passes through its sharp sword from eedle capture surface line, and its wire loop is stretched to the below.Then, middle rotating shuttle is to counter-rotation, and by pulling upper thread by the balance that is arranged at Sewing machines, rotating shuttle and shuttle box pass its wire loop in making.Thus, bottom line is inserted the wire loop of logical upper thread and is formed knotting, makes with this.

When described making, bottom line passes towards the pin hole of the needle plate that is formed at Sewing machines substantially as the crow flies from the bottom line leading-out portion of shuttle box, the line guide plate in certain substantially bottom line passes through on the way by the position.

And, when the bottom line of cutting facility cuts off, move and be held to the bottom line maintaining part by the position from bottom line by this cutting facility bottom line.At this moment, because bottom line is moved to than the bottom line maintaining part of bottom line by the more close bottom line leading-out portion in position, therefore can reduce the extraction amount that this moves the bottom line that causes.

Therefore, the bobbin thread after the cut-out can not become unnecessary length, when making next time, and the change that can suppress to produce line tension, and can form knotting well.Thus, can realize making the raising of the sewing quality of beginning.

Second invention is owing to dispose the bottom line maintaining part above the bottom line leading-out portion, therefore configurable bottom line maintaining part is more near the bottom line leading-out portion, when keeping bottom line, further reduce the extraction of unnecessary bottom line, can further realize the raising of sewing quality when making next time.

Description of drawings

Fig. 1 is the stereogram at main position that expression is equipped with the Sewing machines of rotary shuttle mechanism;

Fig. 2 is the side view with an end of the base plate of observing frame along the sight line of Y direction;

Fig. 3 is the stereogram of disclosed rotary shuttle mechanism among Fig. 1;

Fig. 4 is the vertical view of disclosed rotary shuttle mechanism among Fig. 1;

Fig. 5 is the profile along V-V line among Fig. 4.

Among the figure,

The 10-Sewing machines; The 11-needle plate; The 12-eedle; The 13-pin hole; The movable cutting knife of 14-; The 20-frame; 21-base plate (Sewing machines base plate); The 50-rotary shuttle mechanism; 51-shuttle box; The 51a-projection; 51b-line pilot hole (bottom line leading-out portion); Rotating shuttle among the 52-; The big rotating shuttle of 54-; The 56-shuttle; 60-line guide plate; 67-bottom line maintaining part; The D-bottom line; The P-bottom line passes through the position.

The specific embodiment

(overall structure of working of an invention mode)

Is that rotary shuttle mechanism 50 describes based on Fig. 1～Fig. 5 to embodiments of the present invention.Fig. 1 is the stereogram at main position that expression is equipped with the Sewing machines 10 of rotary shuttle mechanism 50.

Below, will with the top parallel of needle plate 11 described later and the direction parallel with the rotary shuttle shaft of not shown Sewing machines 10 as Y direction, will with the top parallel of needle plate 11 and with the direction of Y direction quadrature as X-direction, will with the top vertical direction of needle plate 11 as Z-direction, carry out the explanation of Sewing machines each several part.

Sewing machines 10 has the frame 20 that forms approximate " コ " word shape on the whole, and this frame 20 has: the base plate 21 that is positioned at the bottom of this frame 20; The omission that erects from an end of base plate 21 illustrated vertical main body section; And extend the chain-drive section 22 that is provided with from the upper end of vertical main body section in the direction identical with base plate 21.

And, in chain-drive section 22, being provided with axle along Y direction, the described axle of going up is given the driving force that moves up and down to the shank that keeps eedle 12, is provided with rotary shuttle shaft along Y direction in base plate 21, and described rotary shuttle shaft is given driving force to rotary shuttle mechanism 50.

The above-mentioned axle of going up carries out full rotation in a certain direction by electrical motor of sewing machine, via transmission mechanism to the reciprocal rotating drive power of rotary shuttle shaft transmission.Thus, rotary shuttle shaft and eedle move up and down synchronously or with the frequency of integral multiple, in the scope of roughly half rotation, repeat positive direction and reciprocal rotation.

Fig. 2 is the side view with an end of the base plate 21 of observing frame 20 along the sight line of Y direction.As shown in the figure, be equipped with needle plate 11, on this needle plate 11, be formed with the pin hole 13 of inserting logical eedle 12 when making in the position of downside base plate 21, that become eedle.

In addition, side disposes cutting facility below needle plate 11, and then thereunder, with the state configuration that is built in base plate 21 rotary shuttle mechanism 50 is arranged.

Cutting facility has: movable cutting knife 14, and it can be supported in the following side of needle plate 11 rotationally; Fixed cutting tool, its and this movable cutting knife 14 between clamping and cut off upper thread and the bottom line D that transports by these movable cutting knife 14 cross cuts; Motor, it rotates movable cutting knife 14 on reciprocating direction; And the transmission mechanism of driving force, it links motor and movable cutting knife 14.

Above-mentioned movable cutting knife 14 carries out reciprocal rotation along the platen surface of needle plate 11, sets its reciprocal slewing area, with the vertical below by pin hole 13.

When cutting off, in pin hole 13, insert and be connected with: the part that hangs down from eedle 12 of upper thread, upper thread in the needle plate folded beneath and towards the part and the bottom line D of sewn object, movable cutting knife 14 need keep the part that hangs down from eedle 12 of upper thread from them, the cut-out upper thread in the needle plate folded beneath and towards the part and the bottom line D of sewn object.

For this reason, the structure that movable cutting knife 14 forms is, in the outlet of back and forth rotating, utilize projection 14a only to select and catch the part that hangs down from eedle 12 of upper thread, in the loop, utilize the opposition side of projection 14a, catch upper thread in the needle plate folded beneath and towards the part and the bottom line D of sewn object and be transported to fixed cutting tool.

In Fig. 4 described later, expression has the movable cutting knife 14 of the stop position that is between outlet and the loop.In addition, in this Fig. 4, movable cutting knife 14 back and forth rotates in the scope of arrow S, and the clockwise circumference along figure in the outlet rotates, and rotates along counterclockwise circumference in the loop.

(rotary shuttle mechanism)

Fig. 3 is the stereogram of rotary shuttle mechanism 50, and Fig. 4 is a vertical view.

Rotary shuttle mechanism 50 has as shown in Figure 1: shuttle box 51, and it takes in the shuttle 56 of the bottom line D that reeled; Middle rotating shuttle 52, it back and forth rotates around shuttle box 51; Driver 53, its from rotary shuttle shaft to rotating shuttle 52 transmit the driving force of back and forth rotating; Big rotating shuttle 54, rotating shuttle 52 back and forth rotated and rotating shuttle 52 in the inboard keeps during it can make; Middle rotating shuttle presser feet 55, it is used for rotating shuttle 52 is remained in the inside of big rotating shuttle 54; And line guide plate 60, its when making, guide upper thread the part that hangs down from eedle 12, with upper thread in the needle plate folded beneath and towards the part of sewn object, so that they are separated from each other.

Big rotating shuttle 54 is to make the concentric and incorporate shape of the large diameter cylindrical portion 54a and the cylindrical portion 54b of minor diameter as shown in Figure 1, and the cylindrical portion 54b of minor diameter connects central part, forms and can insert rotary shuttle shaft.

In addition, large diameter cylindrical portion 54a takes in middle rotating shuttle 52, and its inside is formed with the external peripheral zone sliding-contact of middle rotating shuttle 52 and guides the sliding surface of its rotation.In other words, middle rotating shuttle 52 rotatably is supported in big rotating shuttle 54 by sliding surface.

In addition, big rotating shuttle 54 is equipped on Sewing machines base plate 21 with its center line along the mode of Y direction, and under this equipment state, the part that becomes the top of large diameter cylindrical portion 54a forms the almost plane shape crooked slightly.Described almost plane portion is cut into and penetrates into inside, in addition, and at almost plane portion fixed equipment line guide plate 60.And the eedle that has descended is inserted into otch that is formed at almost plane portion and the pilot hole described later 65 that is formed at line guide plate 60, twines upper thread and bottom line D and makes.

Middle rotating shuttle 52 forms approximate fan-shaped, and heart position is provided with fulcrum 52a therein, can support shuttle 56 and shuttle box 51 rotatably via this fulcrum 52a.

In addition, at middle rotating shuttle 52, be formed with the sliding contact surface that slides with the sliding contact surface of described big rotating shuttle 54 at its peripheral part, and be formed with the sharp-pointed sharp sword 52b that upper thread is caught usefulness in an end of peripheral part, thus, in rotating shuttle 52 around the shuttle box 51 of inboard, back and forth rotate, carry out the seizure of upper thread by sharp sword 52b.

Driver 53 and middle rotating shuttle 52 are accommodated in the inside of big rotating shuttle 54 together, and driver 53 is by hugging in the supporting that is fixed of the leading section of rotary shuttle shaft.This driver 53 forms approximate fan-shaped, and when back and forth rotating by rotary shuttle shaft, the end on the circumferencial direction of driver 53 and the other end alternatively contact with middle rotating shuttle 52 respectively, thus with this in rotating shuttle 52 together back and forth rotate.

So, because middle rotating shuttle 52 is not direct and rotary shuttle shaft links, but pushed the structure that back and forth rotates with the driver 53 of rotary shuttle shaft binding, the wire loop that therefore can make upper thread by the change in rotation direction constantly is by the gap of driver 53 with middle rotating shuttle 52, and rotating shuttle 52 passes the wire loop of upper thread in making.And, consequently, can make the shuttle box 51 interior bottom line D that extract out of the inboard of rotating shuttle 52 from be configured in insert the wire loop that leads to upper thread.

Rotating shuttle 52 and driver 53 in these are equipped on the middle rotating shuttle presser feet 55 of the end face of big rotating shuttle 54 by being fixed, be maintained in the large diameter cylindrical portion 54a of big rotating shuttle 54.

Shuttle 56 constitutes coiling bottom line D between each flange part by the center axial region of the tubular of coiling bottom line D and the discoideus flange part that is provided with at its both ends.And the fulcrum 52a of rotating shuttle 52 is inserted under the state of center axial region of tubular in making, by middle rotating shuttle 52 supportings.

Shuttle box 51 is cylindrical body of the inaccessible other end opening of an end, and side is taken in shuttle 56 within it.During being installed in the state of taking in shuttle 56, in the rotating shuttle 52, supports by fulcrum 52a by this shuttle box 51 via shuttle 56.

In addition, the inaccessible end face side at shuttle box 51 is provided with the projection 51a that the rotation of extending setting towards the radial direction outside prevents usefulness.This rotation prevents that the projection 51a of usefulness is embedded into the recess 55a that is arranged at middle rotating shuttle presser feet 55, prevents that shuttle box 51 and shuttle 56 from together rotating with middle rotating shuttle 52.

In addition, its leading section of this projection 51a is bent to form towards the inboard, forms wired pilot hole 51b with breakthrough status on this bend.This shuttle box 51 is formed with through hole 51c on the outer peripheral face of tubular, the bottom line D of inboard shuttle 56 is extracted out to the outside from through hole 51c, and then, insert logical line pilot hole 51b and be directed into line guide plate 60 sides.In other words, this line pilot hole 51b is the guide of the thread path of shuttle box 51 definite bottom line D that derive, and the outlet side of line pilot hole 51b (upper end of projection 51a) is equivalent to " the bottom line leading-out portion of shuttle box ".

(line guide plate)

As shown in Figure 4, line guide plate 60 is that main board 61 and the top flexible latch plate 62 with regulation shape that is installed in main board 61 constitute by OBL flat board, and main board 61 is installed in the top of big rotating shuttle 54 by two limit screws 64 at its two ends, left and right sides.In addition, latch plate 62 is fixed in main board 61 by limit screw 64.

Be formed with the pilot hole 65 that connects in its table in the central authorities of main board 61, when making, upper thread be directed to the position of regulation, in addition, when cutting off, bottom line D is directed to assigned position corresponding to the shape of this pilot hole 65.

Eedle 12 moves up and down (with reference to Fig. 4) with respect to the assigned position of the pilot hole 65 of main board 61, and it enters into the inside of big rotating shuttle 54 when descending, and sharp sword 52b seizure the carrying out wire loop of rotating shuttle 52 forms in the upper thread quilt of slotting logical eedle 12.At this moment, middle rotating shuttle 52 makes sharp sword 52b advance towards right-hand with the state right-hand in Fig. 4.Relative therewith, on main board 61, be formed with upper thread separate part 66, it makes the opposite direction (left among Fig. 4) of direction of advance of the sharp sword 52b of leading section when line is caught of the prominent shape of point.In other words, pilot hole 65 forms the thread path that is separated into two forks across this upper thread separate part 66.

By this upper thread separate part 66, the upper thread of catching by the sharp sword 52b of middle rotating shuttle 52, with sharp sword 52b be the boundary line, the part that becomes its upstream side separates to the both sides of upper thread separate part 66 respectively with the part that becomes the downstream, the upper thread wire loop is by a minute expansion thus.Thus, below sharp sword 52b moves to during, the two side portions that can prevent upper thread by in the sliding-contact part clamping of rotating shuttle 52 and big rotating shuttle 54, and pass the upper thread wire loop and can enlarge fully for rotating shuttle in making.

In addition, in the pilot hole 65 of main board 61, when making from below towards above insert logical bottom line D.And, in pilot hole 65, except two paths of pitching of guiding upper thread, also be formed with path 68 to bottom line maintaining part 67 guiding bottom line D.

This bottom line maintaining part 67 is for making next time is used for the bobbin thread after cutting off is remained the position of specific length in advance, and is that terminal part in the path 68 of above-mentioned guiding bottom line D forms by described latch plate 62.

That is, latch plate 62 has the jut 62a that claw-like is arranged in extension, and this jut 62a is configured in the front of the terminal in path 68 with crossing.In addition, the leading section of this jut 62a shows basic obstruction and lives path 68 under overlooking, but if the oblique upper that tilts from the preceding extreme direction with jut 62a is observed, then regulates its front position, makes in the path 68 gap that bottom line D is passed through to occur.

When cutting off bottom line D, before being about to cut off, 68 move bottom line D along the path by movable cutting knife 14, at this moment, arrive the terminal in path 68 by the narrow and small gap that forms by jut 62a.And, after cut-out,, therefore form the state of the terminal that remains on path 68 because bobbin thread moves because of projection 62a hinders oppositely.In other words, the zone that surrounds of the terminal in path 68 and projection 62a forms bottom line maintaining part 67.

In addition, main board 61 is formed with two broken line W according to the going up facial curved shape of big rotating shuttle 54, and this main board 61 is owing to two broken line W are formed with three platen surface.

On the other hand, if the platen surface of the part of the projection 62a of latch plate 62 does not form the parallel state of platen surface at bottom line maintaining part 67 places in three platen surface with main board 61, then the leading section of projection 62a makes the gap become excessive away from main board 61, just can not play the effect that bottom line keeps.

For this reason, in order not produce bigger gap at the leading section of projection 62a, projection 62a is configured in the plane of bottom line maintaining part 67 residing platen surface, and utilizes the limit screw 63 fixing spring plates 62 that are located in these bottom line maintaining part 67 residing platen surface.

And then, for the path 68 of the bottom line maintaining part in pilot hole 65 67 guiding bottom line D towards and the configuration of bottom line maintaining part 67 set and be described in further detail.

To the path 68 of bottom line maintaining part 67 guiding bottom line D as shown in Figure 4, overlook down, forming along the straight line of the line pilot hole 51b (bottom line leading-out portion) of needle downing position that links eedle 12 and projection 51a.

In addition, movable cutting knife 14 back and forth rotates in the scope of arrow S shown in Figure 4, set the configuration of movable cutting knife 14 and path 68 towards, make at movable cutting knife 14 when cutting direction is rotated, with the tangential direction of the circular-arc motion track of the movable cutting knife 14 of bottom line D position contacting (bottom line described later is by position P), and path 68 towards roughly consistent.Thus, by contacting with the movable cutting knife 14 that rotates to cutting direction, bottom line D 68 moves to bottom line maintaining part 67 sides along the path.

Fig. 5 is the profile along the V-V line among Fig. 4.As shown in Figure 5, bottom line D forms basically with straight line and links path from the line pilot hole 51b of projection 51a to the pin hole 13 of needle plate 11 when making.Therefore, bottom line D passes through line guide plate 60 at certain bottom line by position P when making.

And described bottom line maintaining part 67 is overlooked down, the position that preferably to be arranged at than above-mentioned bottom line be line pilot hole 51b by the more close bottom line leading-out portion of position P.

For example, overlook down, wishing that more bottom line maintaining part 67 is in binding and passes through position P to the line of line pilot hole 51b from bottom line, in the present embodiment, the configuration of bottom line maintaining part 67 is being set the vertical direction of online pilot hole 51b.

(action specification of Sewing machines)

Action to the Sewing machines 10 that is made of said structure describes.

When making, insert the eedle 12 led to upper thread and move up and down, when descending in the sharp sword 52b of rotating shuttle 52 catch upper thread, its wire loop stretches downwards.At this moment, in the online guide plate 60, the upper thread separate part 66 of pilot hole 65 is opened the wire loop of upper thread.And if sharp sword 52b arrives upper/lower positions, middle rotating shuttle 52 is changed into to counter-rotation, then the wire loop of the upper thread that breaks away from from sharp sword 52b is by not shown scale mechanism pull-up, and consequently, rotating shuttle 52 passes the inboard of wire loop in making.Thus, bottom line D also inserts the wire loop of logical upper thread, forms knotting and makes.

And then, if sewing finishing then drives movable cutting knife 14 and carries out trimming.At first, movable cutting knife 14 is positioned at the fixed cutting tool side, from holding state by carrying out the rotation of one way under the pin hole 13.Thus, inserting upstream side part (near the part of upper thread supply source) and the downstream part and the bottom line D of upper thread lead in the upper thread of pin hole 13 is separated.

Then, movable cutting knife 14 rotates to Return-ing direction towards fixed cutting tool.Thus, the downstream part of upper thread and bottom line D are transported to the fixed cutting tool side by movable cutting knife 14 seizure.Thus, bottom line D 68 is moved to bottom line maintaining part 67 and is held along the path by position P from bottom line.

And then bottom line D and upper thread move to fixed cutting tool, cut off.

And,, therefore during new the making after cutting off, can not need to adjust the operation of bottom line because the cut-out end of bottom line D keeps by bottom line maintaining part 67.

(effect of embodiment)

In said structure, in rotary shuttle mechanism 50, bottom line maintaining part 67 is located at than the i.e. vertical top of this line pilot hole 51b, the bottom line of line guide plate 60 position by the more close line pilot hole of position P 51b, therefore, when bottom line maintaining part 67 moves, can reduce bottom line extraction amount at above-mentioned bottom line D from shuttle 56.

In addition, owing to bottom line maintaining part 67 is located at the vertical top of line pilot hole 51b, therefore, the route of the bottom line of line pilot hole 51b-bottom line maintaining part 67-device for cutting lower thread can not become bending and the circuitous route of going the long way round, and can reduce up to the bottom line extraction amount of cutting off.

Claims

1. the bottom line holding device of a Sewing machines,

It comprises:

Rotating shuttle device, its have the shuttle of taking in bottom line the shuttle box, the middle rotating shuttle that back and forth rotates around the described shuttle box and can make described in rotating shuttle back and forth rotate and the big rotating shuttle of rotating shuttle in the inboard maintenance is described;

Cutting facility, it is by moving the top that bottom line is configured in rotating shuttle device; With

The line guide plate, it is configured in the top of described big rotating shuttle, and is provided with the bottom line maintaining part, and described bottom line maintaining part is caught bottom line when the movable cutting knife of described cutting facility mobile,

It is characterized in that,

Bottom line when making is compared by the position, near the described bottom line maintaining part of the configuration bottom line leading-out portion of more close described shuttle box,

Described rotating shuttle device has the described line guide plate that is provided with described bottom line maintaining part, and described shuttle box has the bottom line leading-out portion.

2. according to the bottom line holding device of the described Sewing machines of claim 1, it is characterized in that,

Vertical direction at the bottom line leading-out portion of described shuttle box disposes described bottom line maintaining part.