JPH10309395A - Automatic thread pass sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a thread passing means such as a thread passing hook from colliding with the other member when executing operation for passing a thread through a needle hole by providing a separating means for separating a sewing needle and its surrounding member before thread passing operation. SOLUTION: Only when a start switch is turned off and a pressing foot is located at a higher position, a sewing machine motor is driven. When the sewing machine motor is driven, an upper shaft and a balance crank are rotated, and the thread is started being hung on a balance. Besides, the rotation of the balance crank is converted to reciprocative motion and transmitted to a needle bar, and the needle bar is vertically moved. The sewing machine motor is stopped after confirming whether the upper shaft is rotated once or not and whether the phase angle of the upper shaft becomes NP1 and an NP1 sensor outputs a detecting signal or not. Thus, the thread passing member or the like is prevented from colliding with the presser foot or any other member when executing operation for passing the thread through the needle hole. Namely, the ROM of electronic control circuit storing the sewing machine motor and the stop processing means of sewing machine motor corresponds to the separating means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for sewing
The present invention relates to an automatic threading sewing machine that performs a threading operation of a sewing needle through an eye hole.

[0002]

2. Description of the Related Art Conventionally, many attempts have been made to automate a threading operation of a sewing needle into an eye hole (hereinafter, referred to as a needle-hole threading) in preparation for sewing a sewing machine. As a basic configuration of the needle hole threading, for example, there is a proposal of Japanese Utility Model Publication No. 54-43878. In this proposal, a threading bar that moves up and down in parallel with a needle bar rotates at a predetermined height, thereby allowing a threading hook provided at a lower end of the threading bar to be inserted into an eye hole of a sewing needle. The operator has carried out needle hole threading by hanging the upper thread on the threading hook.

There is also a proposal that the upper thread is passed over the threading hook mechanically so as not to bother the operator. For example, JP-A-63-89194. In this proposal, a thread tension member that stretches an upper thread in front of an eye hole of a sewing needle by rotating a threading rod is described.

[0004] In performing needle hole threading using such a mechanism, the needle bar is moved to a predetermined raised position so that the threading hook or the thread tension member does not hit the presser foot or the like. Need to run through. Therefore, prior to threading the needle hole, an operation of rotating the upper shaft to raise the needle bar so that the needle bar is at a predetermined position has been performed.

[0005]

However, a conventional sewing machine performs sewing in a state where the needle thread is hung on a needle bar thread guide before the upper thread is inserted into the eye of the sewing needle. Therefore, the upper thread drawn from the upper thread supply source prior to the execution of the needle hole threading had to be previously hooked on the needle bar thread guide. For this reason, in the above-described vertical movement of the needle bar, the upper thread is pulled out from the upstream side in the form of being pulled by the needle bar thread guide at the time of descent, and the upper thread that has been pulled out remains when the one-stroke bar is raised. Had sagging. This slack was quite large depending on the position of the needle bar before moving up and down.

When such a slack occurs, the above-described thread tension member may not be able to sufficiently tension the upper thread. Depending on the state of the slack, the upper thread may come off from the thread tension member and fall off. Could not be performed. As a result, in the conventional sewing machine, due to the slack, the upper thread cannot be gripped by the threading hook during the threading of the needle hole, and the threading of the needle hole may fail.

However, after executing the needle hole threading,
It is extremely difficult to hang the upper thread on the needle bar thread guide, and the original purpose of simplifying the preparation of the upper thread before sewing cannot be achieved. The automatic threading sewing machine of the present invention includes:
It is an object of the present invention to solve such a problem and to reliably perform needle hole threading at a needle bar ascending position.

[0008]

As shown in FIG. 1, the automatic threading threader according to the present invention is pulled out from an upper thread supply source w1 and is hooked on a needle bar thread guide w3 at the lower end of a needle bar w2. Needle thread arranging means M1 for arranging the tip side of the needle thread w at a position crossing the front or back of the eye hole w5 of the sewing needle w4, and taking the arranged needle thread w into the eye hole w5. A needle bar vertical moving means M3 for vertically moving the needle bar w2 to move the needle bar w2 to a predetermined threading position; Prior to the threading operation, a slack absorbing means M4 for absorbing the slack of the upper thread w provided is provided during or after execution of the needle bar vertical movement operation.

In the automatic threading machine of the present invention, the needle bar vertical moving means M3 moves the needle bar w2 up and down to move the needle bar w2.
2 is moved to the raised position, and the slack absorbing means M4 is moved to the upper thread disposing means M1 prior to the threading operation of the threading means M2.
Absorbs the slack of the upper thread w which has already been disposed or is to be disposed. Therefore, even if the needle thread w hung on the needle bar thread guide w3 with the vertical movement of the needle bar w2 sags,
The slack is absorbed by the action of the slack absorbing means M4.

As a result, the threading means M2 can execute threading of the sewing needle w4 into the eye hole w5 when the needle bar w2 is at the raised position, and does not collide with the sewing machine main body or peripheral members. When the upper thread w has already been disposed at the predetermined position by the upper thread disposing means M1, the upper thread w is corrected to be slack and deviated from the predetermined position, while the upper thread w is now disposed. In this case, the disposing operation of the disposing means M1 is executed as predetermined.

The slack absorbing operation of the slack absorbing means M4 may be executed in parallel with the needle bar up and down movement by the needle bar up and down moving means, or may be executed after the end of the needle bar up and down movement. You may.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. The sewing machine according to the present embodiment is a fully automatic threading threader that has a function of automatically executing threading to a balance section (hereinafter referred to as “balance threading”) in addition to needle hole threading. is there.

FIG. 2 is a perspective view of the sewing machine head 1 of the fully automatic threading threader when viewed from the face plate 3 direction. On the upper portion of the sewing machine head 1, a thread stand 5 and an upper thread hook 9 for turning an upper thread w drawn out from a thread spool 7 attached to the thread stand 5 to the front side are provided. Further, the sewing head 1 is provided with a guide groove 11 which goes from just before the upper thread hook 9 to the front across the upper surface, descends from the upper front portion to the lower portion, and goes through the lower front surface of the face plate 3 to the rear surface.

On the front side of the sewing head 1, a push button switch SW is provided one by one up and down with the guide groove 11 interposed therebetween.
1 and SW2 are provided. The lower switch SW1 is a start switch for instructing the start of sewing, and the upper switch SW2 is a threading switch for instructing execution of a balance thread hook and needle hole threading, which will be described later. Hereinafter, SW1 is referred to as a start switch, and SW2 is referred to as a threading switch.

As shown in FIG. 3, the guide groove 11 passes between the two plates 15-15 of the thread tension plate 13 when viewed from the front.
A path which obliquely crosses the vicinity of the middle of the yarn path 17 above the yarn take-up spring 19, descends and winds the needle bar yarn guide 23 provided at the lower part of the needle bar 21, and smoothly curves the lower front portion of the face plate 3. None, and it also wraps around the back by a predetermined amount. The end point 25 of the guide groove 11 that has turned around to the back
Is equipped with a thread cutting cutter 27.

A balance 30 that swings up and down on the front side of the thread path 17 is provided inside the sewing machine head 1 at the front portion of the guide groove 11. The balance 30 is attached at its tip to FIG.
As shown in (c), a claw 31 bent upward from below so that the upper thread w can be scooped up, a covering rod 32 disposed so as to cover the claw 31, and this covering. Rod 32
And a presser cover 33 fixed to the cover. Then, as shown in FIG. 4A, the slightly elongated slender thread holding hole 3 is formed by the claw 31 and the presser cover 33 as seen from the face plate 3 side.
4 are formed.

As shown in FIG. 4B, the presser cover 33 has a U-shaped cross section that crosses the thread path 17 when viewed from above, and includes a front plate 35 located on the front side of the thread path 17. It comprises a rear plate 36 located on the rear side, and a connecting plate 37 for connecting the two plates 35, 36 on the front side of the yarn path 17.

The tip of the hook 31 overlaps with the front plate 35 and is slightly bent toward the yarn path 17 as shown in FIG. On the other hand, as shown in FIG.
A notch 38 is formed so that the tip of the claw 31 is exposed. As shown in FIG. 5, the balance 30 is swingably mounted on a sub shaft 41 disposed in parallel with the upper shaft 40, and includes a base 43 having a cam hole 42 formed near the mounting portion. . A crank pin 45 of a balance crank 44 fixed to the upper shaft 40 is inserted into the cam hole 42.
The cam hole 42 is formed at a central arc portion 46 having a curvature substantially equal to the rotation radius of the crank pin 45, a straight portion 47 formed at an end on the counter shaft 41 side, and at another end. And a short arc portion 48 having a small curvature.
Rotates the balance 30 in an arc as shown by the arrow in the figure. In this arc movement, the balance 30 is
The mounting relationship between the cam hole 42 and the crank pin 45 is determined so that the cam hole 42 can swing to a position beyond the lower end 50 of the yarn path 17 as indicated by the one-dot chain line in FIG.

On the other hand, at the lower end 50 of the yarn path 17, a yarn receiver 52 having a concave portion 51 which is concave upward is provided. At a position facing the recess 51 of the thread receiver 52, a pressing roller 53 is provided so as to be able to approach and separate. At the time of sewing, the pressing roller 53 is driven by a cam mechanism (not shown).
It functions to adjust the tension of the upper thread w by approaching and separating from the thread receiver 52. A guide member 55 is disposed at an intermediate portion between the balance 30 and the thread receiver 52 so as to wind the thread take-up spring 19 and the thread path 17.

The lower end of the threading bar 60 arranged in front of the needle bar 21 is located at the curved portion of the guide groove 11 toward the face plate 3 ahead of these balance portions. This threading rod 6
0 will be described. As shown in FIG. 6, a frame 61 that supports the needle bar 21 is attached inside the face plate 3, and the threading bar 60 can move up and down and rotate on an axis parallel to the needle bar 21. This frame 61 is supported. At the lower part of the threading rod 60 supported by the frame 61, a guide mechanism and a link mechanism, which will be described later, are operated by the vertical movement and rotation of the threading rod 60, so that the threading rod 60 is in front of the eye 63 of the sewing needle 62. A thread tension member 64 for stretching the upper thread w, and a threading member 65 for taking the stretched upper thread w into the eye hole 63 are attached.

First, the structure of the thread tension member 64 will be described.
As shown in FIG. 7A, the thread tension members 64 are arranged side by side at substantially the same height so as to wrap around from the side close to the needle bar thread guide 23 toward the front of the sewing machine head 1 toward the back side. The first threaded portion 66, the second threaded portion 67, and the third threaded portion 68, and a position slightly above the three threaded portions 66, 67, 68, and further around to the back. And a thread end holding member 70 disposed at

The needle bar 21 is provided below the first thread tension portion 66.
A thread hooking claw 71 projecting to the side is formed. At a lower portion of the second threading portion 67, a holding claw 72 is formed slightly above the thread hooking claw 71 of the first threading portion 66 and protruding forward from the first threading portion 66. Have been. Further, a pressing piece 73 is formed on the upper portion of the third threading portion 68 so as to be aligned with the pressing claw 72 of the second threading portion 67 and project to the front side at substantially the same height as the pressing claw 72. I have.

Of these, the first and second threaded portions 66,
As shown in FIG. 7 (b), the plate 67 is formed integrally by bending a single plate material into a substantially “B” cross section. The arrangement relationship between these two thread tension portions 66 and 67 will be described in detail.
The second threading portion 67 is provided with the first threading portion 66 so that the two threading portions 66 and 67 partially overlap as viewed from the front.
Is spaced slightly behind by a predetermined gap 74.
The first and second thread tension portions 66 and 67 are directly attached to a metal bracket 75 having a U-shaped cross section which is rotatably attached to the threading rod 60.

The third thread tension portion 68 is formed at the free end of a rotating arm 77 whose one end is fitted to the threading rod 60 and is prevented from rotating by a pin 76. further,
When the upper thread w is guided, the thread end holding member 70 is slidably attached to a receiving plate 80 that supports the upper thread w from below and a support column 81 erected on the receiving plate 80. Plate 8
2 is provided. The holding plate 82 is urged downward by a spring 83 attached to the column 81. In the vicinity of the support column 81 of the receiving plate 80, one receiving groove 84 extending in the tangential direction of the support column 81 is formed.

The thread end holding member 70 is provided with a support shaft 8 erected downward at the end of an arm 80a extending from the receiving plate 80.
0b, it is rotatably supported by the third threaded portion 68. On the other hand, an odd-shaped pin 85 having a large-diameter portion at the center in the longitudinal direction is loosely fitted to one end of the above-described “U-shaped” metal fitting 75. The thread end holding member 70 is provided with the deformed pin 8
5 and a supporting lever 81, each end of which is loosely fitted to the "U" -shaped bracket 75 by a connecting lever 86. The support column 81 is slidably engaged with a guide groove 88 formed on the lower surface of a slide guide 87 that is loosely fitted to the threading rod 60.

The sliding guide 87 is vertically fixed to the threading rod 60 with an E-shaped retaining ring E, and is formed through a groove 89 having a U-shaped cross section vertically disposed from the upper surface. It is slidably engaged with a pin 61a protruding horizontally below the body 61. The sliding guide 87 serves as a guide for vertically moving the threading rod 60 by means of a "U" -shaped groove 89, and also serves to guide the column 81 in the horizontal direction via a guide groove 88 on the lower surface. Also plays.

Next, the configuration of the threading member 65 will be described.
The threading member 65 is attached to the back surface of the rotating arm 77 as shown in FIG. 8, extends rightward in the figure, and is bent to the front side. And two hook guards 91 provided. As shown in FIG. 9, a guide groove 93 is formed at the tip of each hook guard 91 toward the downward hook 92 of the tip of the threading hook 90.

The thread tension member 64 and the threading member 65 thus configured operate at predetermined positions at predetermined timings by the vertical movement and rotation of the threading rod 60. The vertical movement and the turning operation will be described together with the mechanism. As shown in FIG. 6, a guide member 95 disposed so as to cover the upper part of the threading rod 60 is attached to the threading rod 60 so as to be vertically slidable. The guide member 95 has a rotating cam hole 96 formed of a long hole obliquely engraved at a predetermined upper position.
The threading rod 60 is provided with an engagement pin 9
7 is engaged with the rotating cam hole 96 via one end.
The threading member 60 is urged from above by a spring 98 attached between the top plate of the guide member 95 and the engagement pin 97. As a result, the engagement pin 97 is normally in contact with the lower end of the rotating cam hole 96.

The guide member 95 is connected to a spring 99 mounted on the upper portion of the frame body 61.
Urged upwards. A pressing plate 101 provided on an upper end of a rack 100 that slides in parallel with the threading rod 60 is in contact with an upper end of the guide member 95 from above. The rack 100 is driven up and down by dedicated pulse motors 105 via gears 102 to 104.

When the rack 100 is lowered, the threading rod 60
Is lowered together with the guide member 95, and stops at that position when the left end side of the engagement pin 97 in the figure comes into contact with the contact member 106 attached to a predetermined position of the needle bar 21. Contact member 1
06 is determined in consideration of the position of the eye hole 63 of the sewing needle 62, and at the stop position of the threading rod 60, the threading hook 90 of the threading member 65 matches the height of the eye hole 63. It is made to do. When the rack 100 further descends, the engagement pin 97 slides along the cam hole 96, and the threading rod 60 rotates. By this rotating operation, the thread tension member 64 and the threading member 65 are moved from FIG.
Rotate as shown in (c).

When the threading rod 60 rotates clockwise in the figure, the rotating arm 77 rotates clockwise integrally with the threading rod 60. Then, the receiving plate 80 is pushed to the left in the drawing, and the support column 81 slides in the guide groove 88 to the left in the drawing. Along with this, the “U” -shaped bracket 75 is rotated counterclockwise in the drawing with respect to the threading rod 60 by being pulled by the connecting lever 86. As a result, as shown in FIG. 10 (b), the thread tension member 64 spreads to maximize the distance between the first and second thread tension portions 66, 67 and the thread end holding member 70, and the threading hook 90 is inserted into the eye 63 of the sewing needle 62. In this state, when the threading rod 60 rotates in the opposite direction,
As shown in (c), the thread tension member 64 returns to the contracted state by the reverse movement.

Next, the procedure for preparing the upper thread w through the guide groove 11 will be described with reference to FIGS.
This will be described with reference to (a). First, the presser foot lever 110 provided on the rear side of the needle bar 21 of the sewing machine head 1 is operated to raise the presser foot 112 to open the thread tension disc 13. Next, the upper thread w is pulled out from the thread spool 7 and hanged on the upper thread hook 9, and then guided from the front to the back along the guide groove 11. Then, the upper thread w is guided between the plates 15 and 15 of the thread tension tray 13 on the front side of the sewing machine head 1, is hooked on the thread take-up spring 19 from above, and then is hooked on the needle bar thread guide 23. Of the third threading portion 68 from below, passing directly below the pressing claws 72 of the second threading portion 67. Then, the receiving plate 80 of the thread end holding member 70 and the holding plate 8
2 and is further wrapped around and cut by the cutter 27.

FIG. 10A shows the state in which the upper thread w is prepared on the thread tension member 64 in this manner. Since the upper thread w has wrapped around to the end point 25 of the guide groove 11, as shown in the figure, the thread end holding member 7 bites into the root of the support column 81.
It is held at 0. The upper thread w has some slack as a whole along the guide groove 11.

Next, the configuration of a control system of the fully automatic threading threader will be described with reference to FIG. The control system of this fully automatic threading threader includes a CPU, ROM, and RAM.
The electronic control circuit 120 mainly controls the balance thread hooking, the needle hole threading, and the sewing. The input side of the electronic control circuit 120 is connected to a start switch SW1 and a threading switch SW2, and the output side is connected to a sewing machine motor 125 and a pulse motor 105 via a sewing machine motor driver 122 and a pulse motor driver 124. . In addition, the electronic control circuit 120 has an NP1 sensor 130 that sends out a detection signal when the needle bar is at the uppermost position (hereinafter referred to as NP1) from the phase angle of the upper shaft 40, and when the balance is at the uppermost position (hereinafter referred to as NP2). An NP2 sensor 132 that sends out a detection signal is connected. Further, the electronic control circuit 120 includes a presser foot position sensor 134 for transmitting a detection signal when the presser foot 112 is raised in cooperation with the presser foot lever 110, that is, when the thread tension disc 13 is in an open state.
6, a threading confirmation sensor 136 which is attached to the top of the guide member 95 of the threading bar 60 and operates when the upper end of the threading bar 60 projects by a predetermined amount or more to send out a detection signal. It is connected.

Next, control processing executed by the electronic control circuit 120 will be described. 12 and 13 show flowcharts of the control processing. As described above, the upper thread w is pulled out from the thread spool 7 and guided to a predetermined position along the guide groove 11. When the power is turned on to the sewing machine, first, initialization is executed, and the origin of the pulse motor 105 and other various motors is set (step 1; hereinafter, each step is simply referred to as S).

Next, it is determined whether or not the threading switch SW2 is depressed and turned on (S2). When the threading switch SW2 is turned on, the process proceeds to the next step, and it is determined whether or not the activation switch SW1 is off (S3). If it is determined in this processing that the activation switch SW1 is in the off state, it is determined whether the presser foot 112 is in the upper position, that is, whether the thread tension disc 13 is in the open state (S).
4). If the activation switch SW1 is in the ON state or the presser foot 112 is not raised, the process does not proceed to the following process but returns to S2. That is, the threading switch SW2 is a switch that operates momentarily, and if S3 or S4 is negative, the following processing is not executed unless it is pressed again.

On the other hand, only when the start switch SW1 is in the OFF state and the presser foot 112 is at the upper position, the process proceeds to the next processing to drive the sewing machine motor 125 (S5).
When the sewing machine motor 125 is driven, the upper shaft 40 rotates. With the rotation of the upper shaft 40, the balance crank 44 also rotates, and the balance 30 is swung to start the balance thread hooking. Needle bar crank 142 connected to crank pin 45
Converts the rotational movement of the balance crank 44 into a vertical reciprocating motion, and transmits the reciprocating motion to the needle bar 21 via the needle bar holder 144. As a result, the needle bar 21 is moved up and down.

The sewing machine motor 125 is stopped after confirming whether or not the upper shaft 40 has made one rotation or more and whether or not the phase angle of the upper shaft 40 has become NP1 and the NP1 sensor 130 has output a detection signal (S6). , S7, S8). In the present embodiment, the phase angle of the upper shaft 40 is NP in the process of S7.
When the sewing machine motor 125 is stopped after confirming that the number has become 1, the threading member 65 and the like are prevented from colliding with the presser foot 112 and other members when executing the needle hole threading operation described later. doing.

A description will now be given of the balance thread hooking executed during the above-described processing of S5 to S8. As shown in FIGS. 14A to 14C, when the balance 30 is swung down, the guide grooves 11
The pressing cover 33 at the tip of the balance 30 abuts on the upper thread w prepared across substantially the center of the thread path 17 along the line. At this time, the upper thread w is in contact with the lower surface of the front plate 35 and the lower surface of the rear plate 36 of the presser cover 33 as shown in FIG. Become. Balance 3
No. 0 is further lowered downward while being in contact with the upper thread w, and the upper thread w is drawn out along the thread path 17.

At this time, the upper thread w is drawn out from both the upstream side and the downstream side. However, the end of the upper thread w is held by being sandwiched by the thread end holding member 70, while the thread tension disc 13 is in an open state, so that the upper thread w is swung to the extent that there is no slack on the downstream side. The required amount is drawn from the upstream side.

The balance 30 is further lowered to reach a position beyond the lower end 50 of the yarn path 17. Then, the front plate 35 and the rear plate 36
The thread path 17 that has prevented the upper thread w from dropping into the thread holding hole 34 in the middle is eliminated. Further, the upper thread w is pulled obliquely upward by the positional relationship between the thread tension tray 13 and the tip of the balance 30 and the spring-up operation of the thread take-up spring 19. As a result, the upper thread w comes off the notch 38 of the presser cover 33, enters the recess 51 of the thread receiver 52, and hangs on the inner part of the thread holding hole 34. The inside of the yarn holding hole 34 is the yarn path 1
Since the balance 30 is located above the lower end portion 50 of the balance 7, even if the balance 30 swings upward from this state, the balance 30 does not cross the lower end portion 50 again.

As described above, the thread receiver 52 and the balance 30
Of the thread on the thread holding hole 34 is completed. During this time, the needle bar 21 reciprocates up and down transmitted through the needle bar crank 142 as described above.

Here, as shown in FIG. 3, the upper thread w guided along the guide groove 11 is hooked on the needle bar thread guide 23 and then passed to the left in the figure. Therefore, when the needle bar 21 starts to descend, the upper thread w is pushed downward by the needle bar thread guide 23. At this time, as described above, since the end of the upper thread w is held by the thread end holding member 70, the upper thread w is pulled out from the upstream side by about twice as much as the downward movement of the needle bar thread guide 23. At this time, the upper thread w is in a state of being stretched by the needle bar thread guide 23, and no slack has occurred. Therefore, the state of being initially guided by the thread tension member 64 is maintained.

On the other hand, when the needle bar 21 is raised, the needle bar thread guide 23 is raised with little force applied to the upper thread w. For this reason, the extra upper thread w pulled out when the needle bar 21 descends remains as slack on the thread tension member 64 side in this state. However, since the vertical swing of the balance 30 and the vertical movement of the needle bar 21 are interlocked, the balance 30 is swung down when the needle bar 21 is lowered, and the balance 30 is swung when the needle bar 21 is raised. It is being swung up. Accordingly, as described above, the surplus upper thread w which is pulled out by the needle bar thread guide 23 is left.
As shown by a dashed line in FIG. 14 (a), is lifted upward by the claw 31 with a swing-up operation of the balance 30 performed along with the raising of the needle bar 21.

Therefore, in the vicinity of the thread tension member 64,
No slack of the upper thread w remains. As a result, the same state as initially guided along the guide groove 11 is maintained in the thread tension member 64, and the needle bar 21 is stopped at the uppermost position (S
7, S8). Next, the pulse motor 105 is rotated forward (S
9). Note that “the pulse motor 105 rotates forward” means
This refers to a case where the rack 100 is driven in a direction of descending.

When the pulse motor 105 is rotated forward, FIG.
As shown in FIGS. 0 (a) to (c) and FIGS. 15 (a) to (c), needle hole threading is executed. The operation will be described. When the pulse motor 105 is rotated forward, as described above,
The threading rod 60 descends. The threading hook 90 is the eye hole 63
At the same height, the threading rod 60 rotates at that height. As a result, as shown in FIG.
4 is in the expanded state, the first and second threaded portions 66, 6
Reference numeral 7 denotes a state in which it has been rotated to a position beyond the sewing needle 62.

At the time of this expanding operation, the end of the upper thread w is
Since the needle thread w is held by the thread end holding member 70, the needle thread w is mainly pulled out from the upstream side, and is stretched over the front of the eye 63 of the sewing needle 62. At this time, the upper thread w
Into the lower side of the first threaded portion 66 through the
3 is in a state of almost abutting.

In a state where the upper thread w abuts on the eye 63, that is, in the thread tensioning operation by the thread tension member 64, the upper thread w
Is in a state of being stretched between the second thread tension portion 67 and the thread end holding member 70. In addition, when the thread tension member 64 is expanded, the thread end holding member 70 moves straight to the left along the guide groove 88 as shown in FIGS. Accordingly, the thread end holding member 70 draws out the upper thread w from the needle bar thread guide 23 side by this large stroke to the left in the figure. As a result, even when the slack of the upper thread w cannot be completely absorbed when the balance 30 is swung up, the remaining slack is eliminated by this large stroke.

Thus, at the same time when the thread tensioning operation by the thread tensioning member 64 is performed, the threading member 65 is rotated clockwise in the drawing. As a result, the threading hook 90
As shown in FIG. 15A, the upper thread w is projected to the front side through the eye hole 63, and the upper thread w is hooked on the downward hook 92 through the guide groove 93 of the hook guard 91.

It is confirmed by the ON signal of the threading confirmation sensor 136 whether or not the upper thread w is hooked on the threading hook 90 inserted through the eye 63 (S10). When the threading confirmation sensor 136 is turned on, the timer is set and the pulse motor 105 continues to rotate forward until a predetermined time has elapsed (S12). This processing is performed by the upper thread w
Is taken into consideration in some cases that the upper thread w is not hooked on the threading hook 90, and the next operation is performed after the upper thread w is securely hooked on the threading hook 90.

After a lapse of a predetermined time, the pulse motor 105 is rotated reversely (S13). At this time, the number of pulses C required for the forward rotation is stored in a predetermined memory area in the electronic control circuit 120. Pulse motor 105
Is reversed, the threading rod 60 rotates, and FIG.
As shown in (c), the thread tension member 64 returns to the contracted state, the threading member 65 also rotates, and the threading hook 90 comes out of the eye hole 63. Further, the threading rod 60 rotates,
When the engagement pin 97 comes into contact with the lower end of the rotation cam hole 96, the rotation stops, and the threading rod 60 moves up together with the guide member 95.

As a result, as shown in FIGS. 15B and 15C, the upper thread w hooked on the threading hook 90 is
And is pulled out. At this time, the yarn end of the upper thread w moves outward from the surface of the support column 81 and moves along the groove 84 into the receiving plate 8.
It falls off from between 0 and the presser plate 82.

The pulse motor 105 is rotated in the reverse direction by the number of pulses corresponding to the pulse number C at the time of normal rotation stored immediately before the reverse rotation, and stopped (S14, S15). As a result, the balance thread hooking and the needle hole threading are completed.
Is pressed and turned on, sewing control is started (S16).

When the sewing control is instructed, first, the presser foot 11
It is determined whether or not 2 is lowered (S17). If the presser foot 112 is at the upper position, the process returns to S16 and sewing is not started. On the other hand, when the presser foot 112 has been lowered, the sewing machine motor 125 is driven to perform sewing (S18). The sewing by the sewing machine motor 125 is continued until the start switch SW1 is pressed again to be turned off (S19).

When the start switch SW1 is depressed and turned off, the sewing machine motor 125 is stopped after the detection signal is transmitted from the NP2 sensor 132 (S20, S21). As a result, the balance 30 is swung up to the uppermost position, and accordingly, the needle bar 21 is also raised and the sewing needle 6 is lifted.
The upper shaft 40 stops in a state in which the thread 2 has come off from the cloth, and the thread comes off from the thread spool (not shown) smoothly.

As described above, according to the present embodiment, the needle bar 21 is raised to the vicinity of the uppermost position prior to the needle hole threading. Therefore, the thread tension member 64 and the thread The threading member 65 does not collide with members around the sewing needle 62 such as the presser foot 112. In addition, since the balance thread hooking is performed in parallel with raising the needle bar 21 to the vicinity of the uppermost position, the extra thread amount generated when the needle bar 21 descends is measured by the balance 3.
It can be absorbed by the swing-up operation of zero. Therefore, although the upper thread w is pulled out with the lowering of the needle bar 21, the drawn upper thread w does not sag and fall off from the claws 71, 72, etc. of the thread tension member 64. . As a result, the upper thread w is stretched over the eye 63 of the sewing needle 62 in the predetermined tension state by the subsequent thread tension operation by the thread tension member 64.

From this, at the time of threading the needle hole, the threading member 65 or the like operates smoothly without colliding with the presser foot 112 or the like, and moreover, the threading hook 92 which has been inserted through the eye hole 63 is surely inserted. The upper thread w can be hooked. As a result, the needle hole threading can be reliably performed.

In the present embodiment, the yarn end holding member 7
The upper thread w is stretched between the zero and the second thread tension portion 67 to be in a tension state, and the thread end holding member 70 pulls the upper thread w from the upstream side with a large stroke to perform the thread tensioning operation. Since it is executed, even if it is not possible to sufficiently absorb the slack of the upper thread w by the balance thread hooking operation, there is a capacity to absorb a considerable amount of the remaining slack, and the upper thread w is surely held in a predetermined tension state. You can overtake. Furthermore, according to the yarn end holding member 70 that moves with a large stroke, even in an experiment in which the slack is not absorbed by the balance yarn hook, the upper stroke generated by the vertical movement of the needle bar 21 due to this large stroke operation. It has been confirmed that the slack of w can be sufficiently absorbed.

As described above, the slack absorbing means is the needle bar thread guide 2
The yarn end holding member 70 is not limited to the upstream side but may be downstream. Furthermore, if the slack is absorbed both upstream and downstream of the needle bar thread guide 23 as in the present embodiment, the slack is almost completely eliminated, and the needle hole threading hardly fails.

In addition, according to the present embodiment, the needle thread threading is executed by applying the needle thread w to the needle bar thread guide 23. Therefore, as soon as the needle thread threading is completed, the sewing is directly performed. Can start. In addition, instead of the configuration of the present embodiment, a configuration may be adopted in which a slack is absorbed by using an upper thread supply motor such as an automatic thread tension sewing machine, or a configuration may be adopted in which a dedicated motor for absorbing the slack is newly provided. It is.

Further, in this embodiment, the upper thread w is
3 is applied to the front of the eye hole 3 in a predetermined tension state, but it is arranged in a state where it is slack at the front or back of the eye hole 63, and the arranged upper thread w is aired or the like. The present invention can also be applied to a sewing machine having a needle hole threading device configured to blow air into the sewing machine. Even with such a sewing machine, the upper thread w
If it loosens, the upper thread cannot be aimed at the eye hole, and the needle thread threading fails. However, as in the present embodiment, this problem can be solved by executing the slack absorption prior to the threading. The slack absorbing operation of the sewing machine having this configuration is executed not only by simply absorbing the slack, but also by re-arranging the upper thread in front of the eye hole. In the present invention, the term “sag absorption” includes such a case.

Further, the needle bar is not necessarily raised near the uppermost position. For example, if the presser foot 112 is lowered to perform needle hole threading, it is not necessary to raise the needle bar to the vicinity of the uppermost position. Although the embodiment of the present invention has been described above, the present invention is not limited to this. For example, the threading hook 90 may be configured to push in the upper thread w instead of pulling the upper thread w into the eye hole 63. Various modes can be adopted without departing from the gist.

[0063]

As described above, according to the present invention, the needle bar is raised to the upper position to execute the needle hole threading.
The threading means does not collide with the sewing machine main body or peripheral members. Therefore, the needle hole threading can be smoothly performed. Moreover, although the needle bar is vertically moved after the needle thread is hooked on the needle bar thread guide, the slack absorbing means absorbs the slack of the upper thread prior to the operation of the threading means. There is no possibility that the slack will fall out of the upper thread arranging means and fall out of the predetermined position, or cannot be arranged in the predetermined position.

Therefore, collision between members is avoided, and
Needle hole threading can be performed. Further, since the needle hole threading is completed in a state where the needle thread is threaded on the needle bar thread guide in accordance with the state at the time of sewing, the operator does not need to perform an operation such as adjusting the upper thread path.

As a result, the sewing machine of the present invention is extremely easy to handle and can reliably execute needle-hole threading.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating the configuration of the present invention.

FIG. 2 is a perspective view showing an appearance of the embodiment.

FIG. 3 is a front view showing the configuration of the guide groove.

4A is a front view of the balance unit, FIG. 4B is a partial plan view thereof, and FIG. 4C is a partial rear view thereof.

FIG. 5 is an explanatory diagram showing a swinging operation of the balance.

FIG. 6 is a rear view of the inside of the sewing machine head showing the configuration of the needle bar and the threading bar.

FIG. 7A is a perspective view of a thread tension member provided at the lower end of the threading rod, and FIG. 7B is a cross-sectional view of the thread tension member in an expanded state.

FIG. 8 is a plan view of a part of the thread tension member and a threading member.

FIG. 9 is a partial side view of the threading member.

FIGS. 10A to 10C are plan views showing a thread tensioning operation of the thread tensioning member.

FIG. 11 is a block diagram illustrating a configuration of a control system according to the embodiment.

FIG. 12 is a flowchart of a control process executed by the control system.

FIG. 13 is a flowchart showing the continuation of the control process.

FIGS. 14A to 14C are explanatory diagrams illustrating a thread hooking operation of the balance.

15A and 15B are perspective views showing a threading operation of a threading member, and FIG. 15C is a sectional view of the same.

[Explanation of symbols]

 M1: upper thread disposing means M2: threading means M3: needle bar up / down moving means M4: slack absorbing means w: upper thread w1: upper thread supply source w2: needle bar w3: needle bar thread guide w4: sewing needle w5 ... Eye hole 7 ... thread spool 9 ... upper thread hook 11 ... guide groove 21 ... needle bar 23 ... needle bar thread guide 30 ... balance 60 ... threading rod 62 ... sewing needle 63 ... eye hole 64 ... thread tension member 65 ... threading member Reference numeral 70: thread end holding member 88: guide groove 105: pulse motor 110: presser foot lever 120: electronic control circuit 125: sewing machine motor 130: NP1 sensor

[Procedure amendment]

[Submission date] July 22, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

However, the operator has to use a needle bar.
If you forget to move the
Of the sewing machine or peripheral members such as the presser foot
there is a possibility.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Deleted

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

An automatic threading machine according to the present invention solves such a problem and provides a threading hook for performing a needle hole threading operation.
It is intended to prevent the threading means such as from colliding with other members .

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

Automatic threading threading sewing SUMMARY OF THE INVENTION The present invention, as illustrated in FIG. 1, applied to the upper thread supply source or al drawn by the needle bar thread draft in the needle bar lower end and the needle thread of the distal end side, is disposed to a position across the front or back of the sewing needle eyelet
The upper thread distribution設手stage, the threading automatic threading sewing machine and a hand stage for executing the threading operation takes in the yarn after being該配set to the eye hole, before Kiito through operation for Separation means for separating the sewing needle from the surrounding members prior to
Characterized in that it comprises a.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009] In the automatic threading machine of the present invention, the thread
Prior to the threading operation, the separating means is used to move the sewing needle and its surrounding parts.
Separate from the material. In this way, the sewing needle and its surrounding members
When the threading operation is performed, the threading means
Does not collide with other members.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

As a result, the threading means can execute the threading of the sewing needle into the eye hole , and does not collide with the sewing machine main body or peripheral members .

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Deleted

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction contents]

The sewing machine motor 125 is stopped after confirming whether or not the upper shaft 40 has made one rotation or more and whether or not the phase angle of the upper shaft 40 has become NP1 and the NP1 sensor 130 has output a detection signal (S6). , S7, S8). In the present embodiment, the phase angle of the upper shaft 40 is NP in the process of S7.
When the sewing machine motor 125 is stopped after confirming that the number has become 1, the threading member 65 and the like are prevented from colliding with the presser foot 112 and other members when executing the needle hole threading operation described later. doing. That is, the sewing machine motor 12
Electronic control circuit 120 storing the processing of S5 and S5 to S8
ROM corresponds to the separating means of the present invention.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0063

[Correction method] Change

[Correction contents]

[0063]

As described above, according to the present invention, the yarn
Prior to the threading operation, the separating means is used to move the sewing needle and its surrounding parts.
Separate from the material. In this way, the sewing needle and its surrounding members
Is isolated, the threading means does not collide with the sewing machine main body or peripheral members. Therefore, the needle hole threading can be smoothly performed .

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0064

[Correction method] Change

[Correction contents]

Therefore, collision between members is avoided, and
Needle hole threading can be performed .

[Procedure amendment 12]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] w: Upper thread 7: Thread spool 9: Upper thread hook 11: Guide groove 21: Needle bar 23: Needle bar thread guide 30: Balance 60: Threading bar
62 ... sewing needle 63 ... eye hole 64 ... thread tension member 65 ... threading member 70 ... thread end holding member 88 ... guide groove 105 ... pulse motor 110 ...
Presser foot lever 120: Electronic control circuit 125: Sewing machine motor 1
30 ... NP1 sensor

[Procedure amendment 13]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Claims (1)

[Claims] An upper thread dispenser for disposing a tip end side of an upper thread drawn from a needle thread supply source and hung on a needle bar thread guide at a lower end of a needle bar at a position crossing the front or back of an eye hole of a sewing needle. An automatic threading machine comprising a threading means for taking in the upper thread disposed in the eye hole and performing a threading operation, wherein the needle bar is moved up and down to a predetermined position. Needle bar up / down moving means for moving to the threading position, and prior to the threading operation, during or after execution of the needle bar up / down operation, a slack absorbing means for absorbing slack of the provided upper thread. An automatic threading sewing machine comprising: