JP4081701B2 - Upper thread switching method of sewing machine and upper thread switching device thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention Ha With regard to a thin upper thread switching method and an upper thread switching device thereof, in particular, holding the vicinity of two thread ends of two threads, wrapping these thread ends by a predetermined length, and spraying an adhesive onto the wrapped portion It is related to the technology that was made to adhere.
[0002]
[Prior art]
Conventionally, in a general household sewing machine, one thread spool is detachably attached to a thread stand, and an upper thread extending from the thread spool (upper thread supply unit) passes through a thread tensioner, a balance, or the like. It is supplied to the sewing needle through a predetermined upper thread path. The sewing needle (needle bar) is moved up and down by the stitch formation mechanism, and the annulus catcher (rotary hook, etc.) is driven in synchronism with it, and is accommodated in the upper thread and the annulus catcher near the sewing needle. The lower thread extending from the bobbin is entangled, and stitches are formed on the work cloth on the bed.
[0003]
By the way, in a home sewing machine, when changing the thread color or type of the upper thread to be used, the upper thread currently in use attached to the upper thread path is removed, and the thread spool is removed from the thread stand. After that, it is necessary to perform a thread changing operation in which the thread spool to be used next is mounted on the spool pin, the upper thread extending from the thread spool is set in the upper thread path, and is passed through the needle hole of the sewing needle. Although various threading devices that can automatically thread the upper thread mounted on the upper thread path through the stitch holes of the sewing needle have been put to practical use, the structure is complicated and disadvantageous in terms of cost.
[0004]
In a sewing machine having an embroidery machine having an embroidery frame that can hold a work cloth and an embroidery frame drive mechanism that can move the embroidery frame in two different horizontal directions, the sewing machine can perform sewing based on sewing data of the embroidery pattern. The embroidery frame driving mechanism is driven and controlled in time with the eye forming mechanism, and the embroidery pattern is sewn on the work cloth held by the embroidery frame. When sewing a multi-colored colorful embroidery pattern, it is necessary to frequently change the thread color of the upper thread to be used. However, in a home embroidery sewing machine, the thread changing operation is frequently performed.
[0005]
On the other hand, an industrial embroidery sewing machine has a plurality of sewing needles (needle bars) arranged in the horizontal direction, and a plurality of thread pieces of different thread colors are mounted on the upper thread supply portion, and a plurality of thread needles extending from these thread pieces. A multi-needle embroidery sewing machine that can automatically sew embroidery patterns in multiple colors by attaching the upper thread to a plurality of sewing needles and operating one sewing needle from these sewing needles based on the embroidery pattern data Is becoming mainstream.
[0006]
In this multi-needle type embroidery sewing machine, a plurality of balances corresponding to a plurality of sewing needles are provided, and a needle bar equipped with a plurality of sewing needles and a plurality of balances are accommodated in a needle bar case, and the needle bar is moved by a case moving mechanism. Move the case to selectively switch one set of needle bar and balance from the multiple pairs of needle bar and balance to the operating position, and move the needle bar and balance at the operating position up and down by a common vertical drive mechanism. I am trying to make it.
[0007]
[Problems to be solved by the invention]
In a conventional household sewing machine, when changing the thread color or type of the upper thread to be used, the operator removes the upper thread currently in use that is installed in the upper thread path, and removes the thread spool. After the thread spool is removed, the thread spool to be used next is attached to the thread spool, the upper thread extending from the thread spool is set in the upper thread path, and the complicated thread changing operation is performed to pass through the eye of the sewing needle. In particular, when sewing a multi-colored colorful embroidery pattern on a home embroidery sewing machine, the thread changing operation is frequently performed in order to frequently change the thread color of the upper thread to be used. This is very troublesome.
[0008]
On the other hand, in a multi-needle embroidery machine for industrial use, the needle bar case is moved by a case moving mechanism, and one set of needle bar and balance is selectively switched to an operating position from a plurality of sets of needle bars and balance. The needle bar and the balance at the operating position are moved up and down by the vertical drive mechanism so that the embroidery pattern of multiple colors can be automatically sewn. ,needle Since a rod case and a case moving mechanism must be provided, the structure is complicated and large, and the manufacturing cost is high.
[0009]
In addition, an automatic yarn knot device for automatically tying the yarn ends of two yarns equipped in the sewing machine is in practical use. However, it is difficult to connect the yarn ends, and it is necessary to prevent the remaining yarn extending from the knot from being taken out, so that the structure tends to be complicated. In addition, although Japanese Patent Publication No. 3-68718 discloses the concept of adhering yarn ends to each other, no specific technique is disclosed.
[0010]
The object of the present invention is to provide two end portions of two yarns installed in the sewing machine. Touch Wearing By Another object of the present invention is to provide an upper thread switching method and an upper thread switching device for a sewing machine that can easily change the thread color and type of the upper thread to be used without performing complicated thread changing work.
[0011]
[Means for Solving the Problems]
[0012]
[0013]
[0014]
[0015]
[0016]
[0017]
[0018]
[0019]
Claim 1 The upper thread switching method of the sewing machine is provided with a plurality of upper thread pieces in advance in the upper thread supply part of the sewing machine, and thread cutting means capable of cutting a middle part of the upper thread extending from the upper thread supply part to the sewing needle side. Provided in advance In addition, on the basis of the flow of the upper thread, an upper thread feeding means capable of feeding the sewing needle side upper thread to the downstream side and the upstream side downstream from the thread cutting means is provided in advance. Upper thread switching that switches the upper thread by bonding the end of the upper thread on the sewing needle side that extends to the sewing needle after cutting the upper thread with the thread cutting means and the end of the upper thread extending from any thread piece of the upper thread supply section In the method, with the first thread holding means holding the vicinity of the thread end of the upper needle thread on the sewing needle side and the second thread holding means holding the vicinity of the thread end of the upper thread extending from the thread piece of the upper thread supply unit, In a state where the upper thread is fed a predetermined amount downstream by the upper thread feeding means, After the first process of cutting the upper thread by the thread cutting means, and then switching the thread spool Pull the needle thread side upper thread upstream by a predetermined amount with the upper thread feeding means, A second step of wrapping the thread end of the upper thread extending from the switched thread piece and the thread end of the upper needle thread on the sewing needle side by a predetermined length; and an adhesive is sprayed onto the wrap by the adhesive spraying means. And a third step of bonding.
[0020]
In this upper thread switching method, first, in the first step, the vicinity of the thread end portion of the needle-side upper thread is held by the first thread holding means, and the upper thread extending from the thread piece of the upper thread supply section is held by the second thread holding means. Hold near the thread end of the thread. The upper yarn is fed downstream by a predetermined amount by the upper yarn feeding means. In the state, the upper thread is cut by the thread cutting means. Next, in the second step, after changing the thread spool Pull the needle thread side upper thread upstream by a predetermined amount with the upper thread feeding means, The thread end part of the upper thread extending from the switched thread piece and the thread end part of the needle thread side upper thread are wrapped by a predetermined length. Thereafter, in a third step, an adhesive is sprayed onto the wrap portion by an adhesive spraying means to bond the wrap portion.
[0021]
Here, in the second step, the thread end of one upper thread is switched from the upper threads extending from the plurality of thread spools to a use position where the thread end of the upper thread on the sewing needle side can be wrapped, The vicinity of the end of the upper thread can be held by the second thread holding means, and the end of the upper thread and the end of the upper thread on the sewing needle side can be wrapped. It should be noted that a plurality of second yarn holding means for holding the vicinity of the yarn end portions of the upper yarns extending from the plurality of yarn spools are provided in advance, and together with the plurality of second yarn holding means, among the yarn end portions of the plurality of upper yarns. Alternatively, the thread end of one upper thread may be switched to the use position.
[0022]
According to this upper thread switching method, it is particularly effective when applied to a sewing machine capable of embroidery sewing and sewing a colorful embroidery pattern of a plurality of colors. The upper thread can be easily switched by simply / reliably bonding the upper thread ends extending from either one of the upper thread end and the upper thread supplying section. That is, the thread color (type) of the upper thread to be used can be easily changed without performing a complicated thread changing operation.
[0023]
[0024]
The upper thread is connected to the seam formed on the work cloth, and the upper thread in the vicinity of the seam cannot be pulled upstream. However, in the first step, the upper thread is previously moved downstream by the upper thread feeding means. By cutting the upper thread in a state where the predetermined amount has been fed, in the third step, the upper thread feeding means does not pull the upper thread (sewing needle side upper thread) in the vicinity of the stitches upstream, so that the upper thread feeding means can The yarn end portion can be pulled back to the upstream side by a predetermined amount, so that the yarn end portion of the upper thread extending from the yarn spool and the yarn end portion of the upper needle thread on the sewing needle side can be reliably wrapped.
[0025]
Claim 2 The upper thread switching device of the sewing machine is provided with a plurality of upper thread pieces on the upper thread supply part of the sewing machine and with a thread cutting means capable of cutting a middle part of the upper thread extending from the upper thread supply part to the sewing needle side. The upper thread which switches the upper thread by bonding the end of the upper thread on the sewing needle side which extends to the sewing needle after the upper thread is cut by the thread cutting means and the end of the upper thread extending from any thread piece of the upper thread supply section In the switching device, first thread holding means for holding the vicinity of the thread end of the needle thread-side upper thread, and a plurality of first threads for holding the vicinity of the thread end of the upper thread extending from the plurality of thread pieces of the upper thread supply section, respectively. Two thread holding means; Upper thread feeding means provided on the downstream side of the thread cutting means on the basis of the flow of the upper thread and capable of feeding a predetermined amount of the sewing needle side upper thread to the downstream side and the upstream side, the first thread holding An upper thread feeding means also serving as a means; The thread end of the upper needle thread that is cut by the thread cutting means and held by the first thread holding means, and the upper thread that extends from any thread piece of the upper thread supply section and is held by the second thread holding means. Wrapping means for wrapping the yarn end portion for a predetermined length and adhesive jetting means for jetting and bonding an adhesive to the wrap portion of the upper thread are provided.
[0026]
In this upper thread switching device, the vicinity of the thread end of the upper thread on the sewing needle side is held by the first thread holding means, and the vicinity of the thread end of the upper thread extending from the thread piece of the upper thread supply unit is held by the second thread holding means. And The upper thread is fed to the downstream by a predetermined amount by the upper thread feeding means. In this state, the upper thread is cut by the thread cutting means, and then the end of the upper thread on the sewing needle side that is cut by the thread cutting means and held by the first thread holding means by the wrap means, and the upper thread supply section The upper end of the upper thread that extends from one of the thread spools and is held by the second thread holding means is wrapped by a predetermined length, and the adhesive spraying means sprays the adhesive onto the wrap portion of the upper thread. The wrap part can be glued.
[0027]
According to this upper thread switching device, it is particularly effective when applied to a sewing machine capable of embroidery sewing, and when sewing a colorful embroidery pattern of a plurality of colors. The upper thread can be easily switched by simply / reliably bonding the upper thread ends extending from either one of the upper thread end and the upper thread supplying section. That is, the thread color (type) of the upper thread to be used can be easily changed without performing a complicated thread changing operation.
[0028]
[0029]
The upper thread is connected to the seam formed on the work cloth, and the upper thread in the vicinity of the seam cannot be pulled upstream, but the upper thread is fed by a predetermined amount in advance to the downstream by the upper thread feeding means. By cutting the upper thread with, the upper end of the sewing needle side upper thread is moved upstream by the upper thread feeding means without pulling the upper thread near the stitch (upper thread on the sewing needle side) upstream. By pulling the fixed amount back, the thread end portion of the upper thread extending from the thread spool and the thread end portion of the needle thread-side upper thread can be reliably wrapped.
[0030]
[0031]
Claim 3 The upper thread switching device of the sewing machine of claim 2 In the invention, the upper thread feeding means also serves as thread tension adjusting means for adjusting the thread tension of the upper thread at the time of sewing. Therefore, the structure is simplified and the manufacturing cost is advantageous.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment is an example of the case where the present invention is applied to a home electronic control sewing machine that can sew various embroidery patterns by detachably mounting an embroidery machine.
[0033]
As shown in FIG. 1, the electronic control sewing machine M has a bed portion 1, a pedestal portion 2 erected from the right end portion of the bed portion 1, and a bed portion 1 from the upper end of the pedestal portion 2. And an arm portion 3 extending leftward.
[0034]
Although not shown, the bed portion 1 includes a feed dog, a feed dog vertical movement mechanism that moves the feed dog up and down, a feed dog forward and backward movement mechanism that moves the feed dog back and forth, and a sewing needle 8 that houses the lower thread bobbin and moves up and down An embroidery machine 70 is detachably attached to a free bed portion, commonly referred to as a free arm, of the bed portion 1 and the like. Has been.
[0035]
The pedestal 2 is formed with a card slot 2a for connecting the ROM card 5 to an internal card connector 86 (see FIG. 7). A liquid crystal display 6 (hereinafter referred to as a display) is provided on the front surface of the pedestal 2, and a touch key comprising a plurality of transparent electrodes on the front surface of the display 6 so as to show a function in display on the display 6. 90 (see FIG. 7) are provided in a matrix.
[0036]
A needle bar 7 is supported on the head 4 of the arm portion 3 so as to be movable up and down and swingable in a direction perpendicular to the cloth feeding direction (left and right direction), and a sewing needle 8 is attached to the lower end of the needle bar 7. ing. Inside the arm portion 3, a needle bar drive mechanism (not shown) that drives the needle bar 7 up and down, a needle bar swing mechanism (not shown) that drives the needle bar 7 to swing, and a balance (not shown) are provided on the needle bar 7. A balance driving mechanism (not shown) that moves up and down in synchronization with the up and down movement of the head is provided.
[0037]
The feed dog vertical movement mechanism, needle bar drive mechanism, and balance drive mechanism are driven by a sewing machine motor 92, the needle bar swing mechanism is driven by a needle bar swing stepping motor 93, and the feed dog forward / backward movement mechanism is forward / backward of the feed dog. It is driven by a driving stepping motor 94 (see FIG. 7). A start / stop switch 9 for instructing start and stop of the sewing work is provided on the front surface of the head 4.
[0038]
Then, an upper thread supply section 10 in which four thread stand bars 11 are erected is provided on the upper side of the arm section 3, and four thread spools 12 are respectively attached to these thread stand bars 11. After cutting the middle part of the upper thread 13 extending from the one thread spool 12 of the supply unit 10 toward the sewing needle 8, the end of the sewing needle side upper thread 13 a extending to the sewing needle 8 and any one of the upper thread supply units 10. The upper thread switching device 15 unique to the present application is provided for switching the upper thread 13 to be used by adhering the ends of the upper thread 13 extending from the upper thread 13.
[0039]
The upper thread switching device 15 will be described in detail. As shown in FIGS. 2 to 6, the upper thread switching device 15 includes a thread cutting mechanism 20, an upper thread feeding mechanism 30, four (second) thread holding mechanisms 40, a wrap mechanism 50, an adhesive injection mechanism 60, and the like. The yarn cutting mechanism 20, the upper yarn feeding mechanism 30, and the adhesive injection mechanism 60 are configured and accommodated in a casing 15 a (see FIG. 1) fixed to the upper portion of the arm unit 3, for example.
[0040]
The thread cutting mechanism 20 is configured to be able to cut a middle portion of the upper thread 13 that extends from the upper thread supply unit 10 to the sewing needle 8 side through a predetermined upper thread path 14, and the upper thread feeding mechanism 30 is configured to operate the upper thread feeding mechanism 30. 13a can be sent to the downstream side and the upstream side, and the first thread holding unit holds the vicinity of the thread end of the sewing needle side upper thread 13a (see FIGS. 11 to 13) that is cut by the thread cutting mechanism 10 and extends to the sewing needle 8. The mechanism also functions as an automatic thread tension mechanism that adjusts the passage resistance applied to the upper thread 13 to adjust the thread tension of the upper thread 13 when performing sewing.
[0041]
The four thread holding mechanisms 40 respectively hold the vicinity of the thread ends of the upper thread 13 extending from the four thread pieces 12 of the upper thread supply section 10, and the wrap mechanism 50 is on the side of the sewing needle held by the upper thread feeding mechanism 30. The yarn end portion of the upper yarn 13a and the yarn end portion of the upper yarn 13 extending from one of the yarn pieces 12 of the upper yarn supply unit 10 and held by the yarn holding mechanism 40 are wrapped by a predetermined length, and the adhesive injection mechanism 60 Is configured such that an adhesive is sprayed onto the wrap portion of the thread end portion of the upper thread 13 and the thread end portion of the sewing needle side upper thread 13a to bond the wrap portion.
[0042]
The four thread holding mechanisms 40 are provided at equal intervals in a left and right line on a vertically oriented thread switching plate 41 that is long in the left-right direction, and each thread holding mechanism 40 is internally fitted and fixed to the thread switching plate 41. An upper thread extending from the four thread spools 12, having a cylindrical member 42 oriented in the front-rear direction, and a rubber thread holding member 43 internally fitted and fixed to the cylindrical member 42 and formed with a thread insertion hole oriented in the front-rear direction. 13 are respectively inserted into the thread holding members 43 of the four thread holding mechanisms 40 and held by the frictional resistance.
[0043]
2 to 6 show a state in which the upper thread 13 of the rightmost thread spool 12 in FIG. 1 is used, and the upper thread 13 extending from the thread spool 12 extends from the rightmost thread holding mechanism 40. It is supplied to the sewing needle 8 through a predetermined upper thread path 14 via the upper thread feeding mechanism 30.
[0044]
The yarn cutting mechanism 20 is disposed on the right side of the upper yarn path 14 between the yarn holding mechanism 40 and the upper yarn feeding mechanism 30. The thread cutting mechanism 20 includes a leading blade 22 and a movable blade 23, and first and second thread cutting actuators 24 and 25 (see FIG. 7) are accommodated in a case 21. 22 is driven to the left, the upper thread 13 is hooked by the upper thread path 14 at the key-shaped blade portion at the tip of the leading blade 22, and the movable blade 23 is driven to the left by the second actuator 25 to be movable. The upper thread 13 is cut by the upper thread path 14 by the blade 23 and the preceding blade 22.
[0045]
When the upper thread 13 extending from the upper thread supply unit 10 toward the sewing needle 8 is cut by the thread cutting mechanism 20, the vicinity of the thread end portion on the downstream side of the upper thread 13 is held by the thread holding mechanism 40, and the upper thread 13 The thread end of the thread protrudes forward from the thread holding mechanism 40 by a predetermined length. Here, in the state of FIGS. 2 to 6, the vicinity of the yarn ends of the remaining three upper yarns 13 is held by the corresponding three yarn holding mechanisms 40, and the yarn ends are respectively fed from the yarn holding mechanism 40 to the predetermined length. It is in a state of protruding forward.
[0046]
The upper thread feeding mechanism 30 includes an upper thread feeding stepping motor 31, a driving roller 32 directly connected to the stepping motor 31, and a driven roller 33 pressed against the driving roller 32. As a reference, it is provided downstream of the yarn cutting mechanism 20. The stepping motor 31 is fixed to the upper side of the leading blade 22 at the retracted position of the yarn cutting mechanism 20, and the stepping motor 31, the driving roller 32, and the driven roller 33 are provided to be inclined by about 45 degrees in the left-right direction. The stepping motor 31 is fixed to the casing 15a, and the driven roller 33 is rotatably supported.
[0047]
The upper thread 13 (sewing needle side upper thread 13a) on the upper thread path 14 is sandwiched between the driving roller 32 and the driven roller 33, and extends from the upper thread supply unit 10 to the sewing needle 8 side when switching the upper thread. Even if the upper thread 13 is cut by the thread cutting mechanism 20, the vicinity of the thread end of the sewing needle side upper thread 13a can be held. Further, the stepping motor 31 can be driven to rotate in both forward and reverse directions. By switching this rotational drive direction and switching the rotational direction of the drive roller 32, the sewing needle side upper thread 13a is sent to the downstream side and the upstream side. be able to. Further, at the time of normal sewing, by controlling the rotational driving amount of the stepping motor 31, the upper thread 13 required for sewing is appropriately fed out so that the thread tension of the upper thread 13 becomes a predetermined thread tension. Can be adjusted as follows. Further, the thread tension is adjusted by adjusting the passing resistance applied to the upper thread 13 by controlling the driving speed of the stepping motor 31 (rotational speed of the driving roller 32) with respect to the sewing speed (upper thread feeding speed). You may make it do.
[0048]
The wrap mechanism 50 includes a thread switching actuator 51. Basically, the actuator 51 moves the thread switching plate 41 in the left-right direction via the rod 52 to drive the four thread holding mechanisms 40 (upper thread). 13), by switching one thread holding mechanism 40 to a use position on the upper thread path 14, the thread end part of the upper thread 13 held by the thread holding mechanism 40 and the upper thread feeding The sewing needle side upper thread 13a held by the mechanism 30 is wrapped with a predetermined length. In the case of this embodiment, the upper thread feeding mechanism 30 is included in the wrap mechanism 50, and the description thereof will be described later.
[0049]
The adhesive injection mechanism 60 is provided on the upper side of the thread path 14 between the upper thread cutting portion of the thread cutting mechanism 20 and the thread holding mechanism 40, and the sewing needle side upper thread 13 a held by the upper thread feeding mechanism 30. A two-component adhesive comprising a main component of an epoxy adhesive and a curing agent is sprayed onto a wrap portion obtained by wrapping the yarn end portion and the yarn end portion of the upper yarn 13 held by the yarn holding mechanism 40 for a predetermined length. Thus, the wrap portion is bonded.
[0050]
An adhesive accommodating case 61 is provided on the upper side of the upper thread path 14, and an epoxy adhesive main agent and a curing agent are separately accommodated in the adhesive accommodating case 61, and the adhesive accommodating case 61 has a piezoelectric element type. The nozzle including the first and second injection mechanisms 62 and 63 extends downward, and energizes the piezoelectric elements 64 and 65 (see FIG. 7) of the first and second injection mechanisms 62 and 63, thereby curing the main agent and curing. Agents are respectively injected into the wrap portions. Here, an adhesive recovery pad 66 made of, for example, sponge for recovering the injected adhesive is provided below the adhesive injection mechanism 60 across the upper thread path 14.
[0051]
The embroidery machine 70 includes a main body case 70a, an embroidery frame 71 on which a work cloth is detachably mounted, and a movable body 72 incorporating a Y-direction drive mechanism for driving the embroidery frame 71 in the Y direction (front-rear direction). And an X-direction drive mechanism that is housed in the body case 70a and drives the movable body 72 in the X direction (left-right direction). The X-direction drive mechanism is driven by the first stepping motor 73, and the Y-direction drive mechanism is It is driven by the second stepping motor 74 (see FIG. 7).
[0052]
When the embroidery machine 70 is mounted on the free bed portion of the bed portion 1, the first and second stepping motors 73 and 74 are electrically connected to the control device C of the sewing machine M via the connector 87 (see FIG. 7). Then, the first and second stepping motors 73 and 74 are driven and controlled by the control device C, and the embroidery frame 71 on which the work cloth is set can be moved and driven independently in the X direction and the Y direction so that embroidery can be sewn. ing.
[0053]
Next, a control system of the electronic control sewing machine M will be described. As shown in FIG. 7, the control device C includes an input interface 80, a computer including a CPU 81, a ROM 82, and a RAM 83, and an output interface 84, which are connected by a bus 85 such as a data bus. Connected to the input interface 80 are a start / stop switch 9, a plurality of touch keys 90, a timing signal generator 91 for detecting the rotational phase of the sewing machine spindle, and the like.
[0054]
The output interface 84 includes motors 92 to 94 and a display controller (LCDC) 95 for the display (LCD) 6 and the first and second actuators for thread cutting of the thread cutting mechanism 20 constituting the upper thread switching device 15. 24, 25, the yarn feeding stepping motor 31 of the upper yarn feeding mechanism 30, the yarn switching actuator 51 of the wrap mechanism 50, the first and second piezoelectric elements 64, 65 of the adhesive injection mechanism 60, and the like are connected. The first and second stepping motors 73 and 74 of the embroidery machine 70 are connected to the output interface 84 via the connector 87, and the ROM 5a of the ROM card 5 is connected to the bus 85 via the connector 86.
[0055]
As shown in FIG. 8, the pattern data memory 82a of the ROM 82 stores pattern data of a plurality of types of embroidery patterns. The pattern data of each embroidery pattern consists of display data, sewing data, and accompanying data. In each pattern data, the display data includes a plurality of pattern parts (first pattern part, second pattern part,... .)), The sewing data consists of sewing data of a plurality of pattern portions, and the accompanying data consists of accompanying data (thread color code, thread stand bar instruction code) of the plurality of pattern portions. A stop code (SC) for stopping the sewing operation at the end of sewing of the pattern portion is additionally stored at the end of the sewing data of each pattern portion.
[0056]
The electronic control sewing machine M is provided with a plurality of ROM cards 5, and a plurality of types of embroidery patterns (first embroidery pattern, second embroidery pattern, third embroidery pattern) are stored in the ROM 5a of each ROM card 5. ..)) Is stored with a structure substantially similar to that of the ROM 82.
[0057]
In the ROM 82, in addition to a general control program for sewing control and display control for sewing an embroidery pattern (normal pattern), when sewing a plurality of embroidery patterns, based on the pattern data, During the sewing of the embroidery pattern, a control program of upper thread switching control unique to the present application for automatically switching from the currently used upper thread 13 to the next upper thread 13 to be used is stored.
[0058]
Next, regarding the upper thread switching control included in the series of pattern selection sewing control executed by the control device C, or executed in parallel with the pattern selection sewing control or by interrupting the pattern sewing control every minute time, This will be described based on the flowchart of FIG.
[0059]
A case will be described in which an embroidery pattern “bear” 98 composed of three pattern portions 98a to 98c having different thread colors is sewn as shown in FIG. In addition, the four thread spools 11 of the upper thread supply unit 10 are changed from the right side to the left side to the first thread spool bar 11, the second thread spool bar 11, the third thread spool bar 11, and the fourth thread spool bar 11. Set. However, Si (i = 1, 2, 3 ...) in a flowchart shows each step.
[0060]
First, when the upper thread switching control is started, the embroidery pattern “bear” 98 is selected by the selection process, and before execution of embroidery sewing, a pattern confirmation screen 96 is displayed on the display 6 as shown in FIG. In the pattern confirmation screen 96, the embroidery pattern “bear” 98 is displayed on the sewing area display portion 97, and the first to third pattern portions 98a to 98c of the embroidery pattern “bear” 98 are displayed on the right side of the embroidery pattern “bear” 98. Display based on display data The It is.
[0061]
Further, below the first to third pattern portions 98a to 98c, the thread color name to be used (in the case of the first pattern portion 98a) based on the accompanying data (thread color code) of the embroidery pattern "bear" 98 "Hadaiiro") is displayed, and on the lower side, based on the accompanying data (thread standing bar instruction code) of the embroidery pattern "bear" 98, the thread colored thread spools 12 of the pattern portions 98a to 98c are displayed. The thread spool 11 to be mounted (the first thread spool 11 in the first pattern portion 98a) is displayed.
[0062]
Then, the operator sees this display and attaches “Hadaiiro”, “Kogecha” and “Koikogecha” thread spools 12 to the first to third thread spools 11 and extends from each thread spool 12. The thread 13 is inserted through the corresponding thread holding mechanism 40 and set. At this time, the upper thread 13 of the thread piece 12 of the first pattern portion is set in the upper thread path 14 and passed through the eye of the sewing needle 8, and the upper thread 13 of the other thread pieces 12 uses, for example, a thread cutting mechanism 20. Then, the thread holding mechanism 40 is protruded forward by the predetermined length.
[0063]
When sewing is started and this upper thread switching control is started, it is determined whether or not a thread replacement command has been input (S1). In S1, for example, it may be determined by reading a stop code (SC) stored incidentally at the end of the sewing data of each pattern portion of the embroidery pattern, but even if the upper thread 13 is switched, Since the upper thread 13 from the upper thread switching portion to the sewing needle 8 is not switched, the next pattern portion is also sewn with the same upper thread 13, so that the next pattern portion can be sewn with the upper thread 13 switched. As described above, the thread replacement command may be inputted while the pattern portion is being sewn, by calculating from the pattern data.
[0064]
When the yarn exchange command is input (S1; Yes), the yarn feeding stepping motor 31 is then driven, and the upper yarn 13 is fed downstream by a predetermined amount by the yarn feeding mechanism 30, as shown in FIG. (S2). Next, the upper thread feeding mechanism 30 holds the vicinity of the thread end of the sewing needle side upper thread 13a, and the thread holding mechanism 40 holds the vicinity of the 13 thread end of the upper thread extending from the thread spool 12 for thread cutting. The first and second actuators are differentially driven, and the movable blade 23 extends after the leading blade 22 catches the upper thread 13 on the upper thread path 14 as shown by the chain line in FIG. As shown, the upper thread 13 is cut (S3). S2 corresponds to the first step.
[0065]
Next, the thread switching actuator 51 is driven, and the thread switching plate 41 is moved by the wrap mechanism 50 as shown in FIG. In the case of the yarn used for the upper thread path 14, the thread end portion of the upper thread 13 held by the second thread holding mechanism 40 from the right side is switched to the used position on the upper thread path 14 (S4). The feeding stepping motor 31 is driven, the sewing needle side upper thread 13 is pulled back by a predetermined amount by the thread feeding mechanism 30, and the thread end of the upper thread 13 extending from the thread spool 12 and the thread of the sewing needle side upper thread 13a. The end wraps (S5). S3 and S4 correspond to the second step.
[0066]
Next, the first and second piezoelectric elements 64 and 65 are driven, and as shown by a dotted line in FIG. It is injected to the lap portion by the injection mechanisms 62 and 63. Then, the main agent and the curing agent are mixed, the epoxy adhesive is dried for a predetermined time, and the wrap portion is bonded (S6). Then return. S5 corresponds to the third step.
[0067]
Thus, according to the upper thread switching device 15, the upper thread feeding mechanism 30 holds the vicinity of the thread end of the sewing needle side upper thread 13 a, and the thread holding mechanism 40 extends from the thread block 12 of the upper thread supply unit 10. While holding the vicinity of the yarn end portion of the upper yarn 13, the upper yarn 13 is cut by the yarn cutting mechanism 20, the yarn piece 12 is switched, and then the upper yarn extending from the changed yarn piece 12 by the wrap mechanism 50. 13 and a thread end portion of the upper needle thread 13a on the sewing needle side are wrapped for a predetermined length, and the two-part adhesive is sprayed onto the wrap portion by an adhesive spray mechanism 60 to bond the wrap portion. it can.
[0068]
Therefore, the present invention is particularly effective when applied to a sewing machine M that can be embroidery sewn as in the present embodiment, and when sewing a colorful embroidery pattern of a plurality of colors, and the upper thread 13 is cut by the thread cutting mechanism 20 to the sewing needle after being cut. The upper thread 13 can be easily switched by simply and reliably bonding the end of the sewing needle side upper thread 13a and the thread end of the upper thread 13 extending from any thread piece 12 of the upper thread supply section 10 to each other. . That is, the thread color (type) of the upper thread 13 to be used can be easily changed without performing a complicated thread changing operation.
[0069]
Since the two-component adhesive is composed of the main component of the epoxy adhesive and the curing agent, the adhesive before spraying is hard to be hardened and easily held in a liquid state, so that the adhesive is spraying mechanism of the adhesive spraying mechanism. The possibility of clogging the nozzles 62 and 63 is reduced, and the adhesive can be reliably injected by the adhesive injection mechanism 60. Since the upper thread feeding mechanism 30 serves both as the first thread holding mechanism and the automatic thread tension mechanism, the structure is simplified and the manufacturing cost is advantageous.
[0070]
The upper thread 13 is connected to the seam formed on the work cloth, and the upper thread 13 in the vicinity of the seam cannot be pulled upstream, but the upper thread 13 is previously moved downstream by the upper thread feeding mechanism 30. By cutting the upper thread 13 in a state where it has been fixedly fed, the upper thread 13 near the stitches (sewing needle side upper thread) is not pulled to the upstream side after the cutting, and the upper thread feeding mechanism 30 causes the thread of the sewing needle side upper thread 13a to be pulled upstream. The end portion is pulled back to the upstream side by a predetermined amount, so that the yarn end portion of the upper thread 13 extending from the yarn spool 12 and the yarn end portion of the sewing needle side upper thread 13a can be reliably wrapped.
[0071]
When the plurality of thread holding mechanisms 40 are moved in the left-right direction together with the thread switching plate 41 by the wrap mechanism 50, tension may be applied to the upper thread 12 extending from the thread spool 13, but even in this case, the upper thread 13 can be securely held by the yarn holding mechanism 40, and the upper yarn 13 can be held in a state where the upper yarn 13 protrudes forward from the yarn holding mechanism 40 by a predetermined amount.
[0072]
The upper thread 13 can be cut on the upper thread path 14 by the thread cutting mechanism 20 having the leading blade 22, the movable blade 23, and the first and second thread cutting actuators 24, 25. The upper thread 13 extending from the yarn spool 12 after being cut at 20 can be reliably held in a state of protruding forward by a predetermined amount from the thread holding mechanism 40. By providing the adhesive recovery pad 66, the adhesive sprayed by the adhesive spray mechanism 60 and not adhered to the upper thread 13 can be reliably recovered without adhering to other parts.
[0073]
A modification of the embodiment will be described.
1] As a two-component adhesive, an adhesive composed of a cyanoacrylate monomer-based main agent and a curing accelerator may be applied.
2] When applying a two-component adhesive, it is desirable that the adhesive injection mechanism 60 causes the main agent and the curing agent to be alternately injected a plurality of times, such as a main agent, a curing agent, a main agent,. That is, the main agent and the curing agent are easily mixed and the adhesive action is improved.
[0074]
3) A one-component adhesive is sprayed and bonded to the wrap portion between the thread end of the sewing needle side upper thread 13a and the thread end of the upper thread 13 extending from the thread spool 12 by an adhesive spray mechanism. Also good. In this case, a cyanoacrylate monomer-based instantaneous adhesive or an ultraviolet curable adhesive can be applied as the one-component adhesive.
[0075]
4] In the case of using an ultraviolet curable adhesive, an ultraviolet irradiation mechanism is provided, and the adhesive sprayed onto the wrap portion can be quickly cured with the ultraviolet light irradiated by the ultraviolet irradiation mechanism. The time required for reliably bonding the yarn ends can be shortened. Moreover, since the adhesive that is not irradiated with ultraviolet rays is hard to be cured and easily held in a liquid state, the adhesive is prevented from being clogged in the injection portion (nozzle) of the adhesive injection means, and the adhesive is injected by the adhesive injection mechanism. Can be reliably injected.
[0076]
5 In the yarn holding mechanism 40, in order to further improve the yarn holding capability, for example, a slit is formed from the side of the cylindrical member 42 and the rubber yarn holding member 43, and a wire-like spring member is inserted into the slit. The upper thread 13 may be pressed against the thread holding member 43 by the spring member to increase the frictional force.
6 A plurality of yarn pieces 12 together with the yarn switching plate 41 may be moved integrally in the left-right direction, and the holding ability of the yarn holding mechanism 40 can be reduced.
[0077]
7 In the adhesive injection mechanism 60, various injection mechanisms such as a thermal jet type and an air flow type can be applied in addition to the piezoelectric element type injection mechanism.
8 It is also possible to provide a yarn changeover switch and change the yarn with this yarn changeover switch, that is, start the flowchart.
[0078]
9 The number of upper threads (the number of yarn spools 12) for switching the upper thread is not limited to four, and it is of course possible to switch between two, three, five or more.
10 It is applicable not only to household sewing machines but also to industrial sewing machines.
[0079]
The present invention should not be construed as being limited to the above-described embodiments, and various modifications can be made to the above-described embodiments based on existing techniques and techniques obvious to those skilled in the art without departing from the technical idea of the present invention. It is possible to make changes.
[0080]
【The invention's effect】
[0081]
[0082]
[0083]
[0084]
[0085]
Claim 1 To change needle thread of sewing machine To the law According to the first aspect, in the first step, the vicinity of the thread end of the upper thread on the sewing needle side is held by the first thread holding means, and the vicinity of the thread end of the upper thread extending from the thread piece of the upper thread supply section is held by the second thread holding means. In the second step, the upper thread is cut by the thread cutting means, and the thread end of the upper thread extending from the switched thread piece and the thread end of the sewing needle side upper thread are switched in the second step. In the third step, the wrap portion can be adhered by spraying adhesive onto the wrap portion by an adhesive spraying means.
[0086]
Therefore, it is particularly effective when applied to a sewing machine capable of sewing with embroidery, and is effective when sewing a colorful embroidery pattern of multiple colors. The upper thread can be easily switched by simply / reliably adhering the yarn ends of the upper thread extending from one of the yarn spools of the thread supply section. That is, the thread color (type) of the upper thread to be used can be easily changed without performing a complicated thread changing operation.
[0087]
And The upper thread is connected to the seam formed on the work cloth, and the upper thread in the vicinity of the seam cannot be pulled upstream. However, in the first step, the upper thread is previously moved downstream by the upper thread feeding means. By cutting the upper thread in a state where the predetermined amount has been fed, in the third step, the upper thread feeding means does not pull the upper thread (sewing needle side upper thread) in the vicinity of the stitches upstream, so that the upper thread feeding means can The yarn end portion can be pulled back to the upstream side by a predetermined amount, so that the yarn end portion of the upper thread extending from the yarn spool and the yarn end portion of the upper needle thread on the sewing needle side can be reliably wrapped.
[0088]
Claim 2 According to the upper thread switching device of the sewing machine, the first thread holding means holds the vicinity of the thread end part of the upper needle thread on the sewing needle side, and the second thread holding means extends the thread end of the upper thread extending from the thread piece of the upper thread supply part. In the state where the vicinity of the portion is held, the upper thread is cut by the thread cutting means, and then by the wrap means, the thread end of the upper needle thread on the sewing needle side that is cut by the thread cutting means and held by the first thread holding means; The yarn end portion of the upper yarn extending from any one of the upper yarn feeders and held by the second yarn holding means is wrapped for a predetermined length, and the adhesive is applied to the wrap portion of the upper yarn by the adhesive injection means. The lap portion can be bonded by spraying.
[0089]
Therefore, it is particularly effective when applied to a sewing machine capable of sewing with embroidery, and is effective when sewing a colorful embroidery pattern of multiple colors. The upper yarn can be easily / reliably switched by reliably bonding the yarn ends of the upper yarn extending from any one of the yarn spools of the yarn supply unit. That is, the thread color (type) of the upper thread to be used can be easily changed without performing a complicated thread changing operation.
[0090]
And Based on the flow of the upper thread, the upper needle thread on the sewing needle side is located downstream of the thread cutting means. And upstream The upper thread is connected to the seam formed on the work cloth and the upper thread in the vicinity of the seam cannot be pulled upstream. By cutting the upper thread in a state in which the upper thread is previously fed downstream by the feeding means, the upper thread is then fed without pulling the upper thread (sewing needle side upper thread) near the stitches upstream. The thread end of the sewing needle side upper thread is pulled back by a predetermined amount by the means, and the thread end of the upper thread extending from the thread piece and the thread end of the sewing needle side upper thread can be reliably wrapped.
[0091]
And Since the upper thread feeding means also serves as the first thread holding means, the structure is simplified and the manufacturing cost is advantageous.
[0092]
Claim 3 According to the upper thread switching device of the sewing machine, the upper thread feeding means is also used as the thread tension adjusting means for adjusting the thread tension of the upper thread at the time of sewing. Is advantageous.
[Brief description of the drawings]
FIG. 1 is a perspective view of an electronically controlled sewing machine according to an embodiment of the present invention.
FIG. 2 is a rear perspective view of the upper thread switching device.
FIG. 3 is a view taken in the direction of arrow III in FIG.
4 is a view taken along arrow IV in FIG. 2;
FIG. 5 is a partially cutaway view of FIG.
6 is a cross-sectional view taken along line VI-VI in FIG.
FIG. 7 is a block diagram showing a control system of an electronically controlled sewing machine.
FIG. 8 is a data structure diagram stored in a ROM of the control device.
FIG. 9 is a flowchart of upper thread switching control executed by the control device.
FIG. 10 is a pattern confirmation screen displayed on the display.
FIG. 11 is a cross-sectional view of the main part of the upper thread switching device (before cutting the upper thread).
FIG. 12 is a cross-sectional view of the main part of the upper thread switching device (after cutting the upper thread).
FIG. 13 is a cross-sectional view of the main part of the upper thread switching device (upper thread wrap state).
[Explanation of symbols]
M Electronically controlled sewing machine
8 Sewing needle
10 Upper thread supply section
12 Ikoma
15 Upper thread switching device
20 Thread cutting mechanism
30 Upper thread feeding mechanism
40 Thread holding mechanism
50 Lap mechanism
60 Adhesive injection mechanism

Claims (3)

The upper thread supply of the sewing machine provided with a pre multiple upper thread thread spool, is provided a yarn cutting means which can cut the middle portion of the upper thread extending needle side from the upper thread supply unit beforehand Rutotomoni, of the upper yarn On the basis of the flow, an upper thread feeding means capable of feeding the sewing needle side upper thread to the downstream side and the upstream side is provided downstream from the thread cutting means in advance, and the upper thread is cut by the thread cutting means and then extended to the sewing needle side. In the upper thread switching method for switching the upper thread by adhering the thread ends of the upper thread extending from either one of the upper thread end and the upper thread supply section,
While holding the yarn end around the upper thread extending from the thread spool of upper thread supply unit by the second thread holding means holds the vicinity of the yarn end of the upper needle side thread by the first thread retaining means, the upper yarn A first step of cutting the upper thread by the thread cutting means in a state where the upper thread has been fed downstream by the feeding means; and, after switching the thread piece, the needle thread side upper thread is turned by the upper thread feeding means. A second step of pulling back a predetermined amount to the upstream side, and wrapping the thread end of the upper thread extending from the switched yarn piece and the thread end of the needle thread side upper thread by a predetermined length;
A third step of spraying and bonding an adhesive to the wrap portion by an adhesive spraying means;
An upper thread switching method for a sewing machine, comprising: A plurality of upper thread pieces are provided in the upper thread supply section of the sewing machine, and a thread cutting means capable of cutting a middle portion of the upper thread extending from the upper thread supply section to the sewing needle side is provided. In the upper thread switching device for switching the upper thread by bonding the end of the upper needle thread extending to the rear sewing needle and the thread ends of the upper thread extending from any thread piece of the upper thread supply section,
First thread retaining means for retaining the vicinity of the thread end of the needle thread side upper thread;
A plurality of second thread holding means for respectively holding the vicinity of the yarn end portion of the upper thread extending from the plurality of yarn pieces of the upper thread supply unit;
Upper thread feeding means provided on the downstream side of the thread cutting means on the basis of the flow of the upper thread and capable of feeding a predetermined amount of the sewing needle side upper thread to the downstream side and the upstream side, the first thread holding An upper thread feeding means also serving as a means;
The thread end of the upper needle thread that is cut by the thread cutting means and held by the first thread holding means, and the upper thread that extends from any thread piece of the upper thread supply section and is held by the second thread holding means. Wrapping means for wrapping the yarn end by a predetermined length;
An adhesive spraying means for spraying and bonding an adhesive to the wrap portion of the upper thread;
An upper thread switching device for a sewing machine characterized by comprising: 3. The upper thread switching device according to claim 2 , wherein the upper thread feeding means also serves as thread tension adjusting means for adjusting the thread tension of the upper thread at the time of sewing.

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