JP2000328424A - Sewing machine device and method for collecting and sewing plurality of needle threads - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine device capable of allowing each needle thread to singly act in the pass of the plural needle threads from the feed sources of the threads through thread-pierced holes of needle thread take-ups to the needles, capable of immediately finding the breakage when one of the needle threads is broken, and capable of preventing the threads from becoming entangled with other threads even if the threads in a course of directing to the needles from the needle thread take-ups even in a sewing machine capable of collecting the needle threads and sewing the threads by using plural needle threads so that the volume of an embroidery pattern formed by the needle threads on the upper surface of a cloth may be increased. SOLUTION: This sewing machine device has bobbin cases 9 for feed of bobbin threads, needles 6 capable of being freely moved upper and lower, and needle thread take-ups 25. Thread-piercing holes 31 of the number corresponding to the number of the needle threads, and formed at the tip parts of the needle thread take-ups 25 are arranged in parallel so as to be freely moved upper and lower. Plural needle threads 45 to be collected and sewed are pierced through the thread-piercing holes 31 at each needle thread take-up 25 to as to have a distance to each other, directed to the needles 6, and sewed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle for supplying a lower thread provided below a needle plate, a vertically movable needle provided above the needle plate, and a balance. From the upper thread guided to the needle through the threading hole of the balance and the lower thread supplied from the shuttle, and more particularly, to a sewing machine for performing a lockstitch. The present invention relates to a sewing machine and a method of sewing a plurality of upper threads together.

[0002]

2. Description of the Related Art A multi-head, multi-needle embroidery sewing machine shown in FIGS. 5 and 6 has a widely known structure (for example, Japanese Patent Laid-Open No. 4-224790, Japanese Patent Publication No. 59-34386).
And JP-A-7-31773. Therefore, a conventional example relating to the needle, the shuttle, the balance, the flow of the thread, and the lateral movement of the multi-needle will be briefly described below with reference to FIGS. The figure shows one head in a multi-head sewing machine. In the head, 1 is a normal needle plate having a needle hole 1a, and 2 is a head, which has a structure of a well-known multi-needle sewing machine head. Hereinafter, the head 2 will be described. 3 to 9 show a known structure of a multi-needle sewing machine, 3 is a frame (base frame), 4 is a needle bar holding frame pivotally mounted on the frame 3, and 5 is a vertically movable needle bar. As shown in the figure, a plurality of bearings 4a are arranged side by side on an arc centered on the center of rotation of the needle bar holding frame 4. Reference numeral 6 denotes a needle, reference numeral 7 denotes a presser foot, and reference numeral 8 denotes a spring mounted on a column 8a for urging the needle bar 5 and the presser foot 7 upward. Reference numeral 9 denotes the presence of a shuttle for supplying the lower thread 9a, which rotates in conjunction with the vertical movement of the needle bar 5 as is well known.

[0003] Reference numeral 11 denotes a well-known needle bar driving mechanism for driving the needle bar 5, which has a crank structure as an example. The mechanism 11 will be described below. A guide rod 12 is provided at the center of rotation of the holding frame 4. Reference numeral 13 denotes an elevating body mounted on the guide bar 12 so as to be movable up and down.
And a needle bar presser 14 for holding the needle bar. Reference numeral 15 denotes a drive shaft (main shaft) rotatably provided on the frame 3, and reference numeral 16 denotes a drive shaft 15.
An eccentric wheel 17 is mounted on the frame 3. Reference numeral 17 denotes a crank rod. Reference numeral 18 denotes a lever. One end 18a is pivotally connected to the frame 3, and the crank rod 17 is connected to an intermediate portion. 19 is lever 18 and lifting body
This is a link connecting 13

[0004] Next, reference numeral 20 denotes a balance device provided on the upper portion of the frame 3. Hereinafter, the balance device 20 will be described. Reference numeral 21 denotes a balance support frame, which is provided so as to reciprocate (rotate) in the lateral direction relative to the frame 3 in conjunction with the needle bar holding frame 4. As an example of the interlocking structure, the guide bar 12 is configured to be rotatable with respect to the frame 3, and the balance support frame 21 is fixed to the upper end of the guide bar 12. An interlocking member is fixed to the needle bar holding frame 4, and the interlocking member and the guide rod 12 are integrated. With such a structure, when the needle bar holding frame 4 reciprocates in a horizontal plane, the balance support frame 21 reciprocates in the horizontal plane integrally with the needle bar holding frame 4 via the guide rod 12. 25 is a balance, a plurality corresponding to the number of needle bars are juxtaposed in the reciprocating direction of the balance support frame 21,
Each base is pivotally attached to the support frame 21 by a support shaft 26.
27 is a connecting piece provided behind each pivot point in each balance, 28 is a positioning piece fitting portion provided on the connecting piece 27, 29
Indicates a driver fitting portion. A well-known threading hole 31 is provided at the tip of the arm of the balance 25. Next, reference numeral 33 denotes a positioning piece fixed to the frame 3 and is formed in an arc shape about the rotation center 12 of the balance support frame 21 in a state parallel to the movement locus of the balance support frame 21. Further, the length is formed so as to cover the entire range of the movement of the connecting piece 27 of each balance 25 accompanying the reciprocating movement of the balance support frame 21 in the lateral direction (however, the balance is located immediately above the needle hole. There is a missing part that allows 25 vertical movements). The positioning piece 33 is adapted to be fitted with the positioning piece fitting portion 28 of the balance 25 when the balance 25 is at an ascending position, for example, a position near top dead center. The width of the missing portion is determined by the connecting piece 27 of the balance 25 and the driving element of the driving lever 34.
In order to be able to move up and down smoothly through the lacking portion in a connected state, they are formed sufficiently larger than their combined width.

[0005] Next, reference numeral 35 denotes a balance driving mechanism in the balance device 20. Numeral 32 denotes a groove cam in the mechanism, which has a cam groove and is fixed to the drive shaft 15. Drive lever 34
Is pivotally attached to the frame 3 by a support shaft 35a so as to be vertically rotatable. 34a is a connecting lever, the driving part of which is the driving lever 3
4, and a follower 34b is provided at the tip, and the follower is located in the cam groove 32.

In the multi-needle sewing machine having the above structure, the drive shaft
With the rotation of 15, the lever 18 swings up and down, and the elevating body 13 repeats up and down movement. As a result, the needle bar 5 located below the needle bar presser 14 is moved up and down. In the balance device 20, the groove cam is used.
By the rotation of 32, the drive lever 34 swings up and down as shown in the figure. As a result, the driver fitting portion 29 of the plurality of balances 25
One balance 25 to which the driver 30 is fitted is reciprocally rotated about the support shaft 26, and the arm reciprocates up and down in synchronization with the needle 6.

Next, the path of the upper thread 45 will be described. Reference numeral 22 denotes a yarn path support frame which is attached to the balance support frame 21 so as to be able to move in a horizontal direction.
0I and 40H are provided therein, and thread paths (circular holes through which the upper thread passes) 40b, 40c and 40d for guiding the upper thread are provided. Therefore, a plurality of upper yarns (color quality between upper yarns,
The thickness or the thread quality is changed from a known upper thread supply source (arbitrary bobbin) (not shown) and provided in a thread take-up spring holding case 44 as shown in FIG. 1, for example. The tension device 42 and the yarn take-up spring 43 reach the yarn path 40b, and the reference numerals 40c, 31, 40d,
From the needle bar holding frame 4 to the needle hole 6a (see FIG. 4) of the needle 6 via the yarn path such as 40e in the overhang plate 40G.
The sewing operation using the upper thread 45 and the lower thread 9a is performed by tangling the upper and lower threads as is well known by the operation of the needle bar 5 and the balance 25 as described above and the rotation of the shuttle 9 linked to the main shaft 15. Will be Further, an embroidery frame is usually placed on the needle plate 1, and the embroidery pattern is sewn on the upper surface of the cloth 41a by operating in the XY directions.

Next, the selection operation of the balance 25 accompanying the selection operation of the needle bar 5 will be described. When the needle bar 5 is located at the top dead center, the drive shaft 15 is stopped, and the needle bar holding frame 4 is rotated in the horizontal direction by a well-known drive means to select the needle bar 5 having a differently colored upper thread. Is performed. The balance support frame 21 of the balance device also rotates in conjunction with the rotation of the needle bar holding frame 4. Due to the rotation, the balance in which the connecting piece 27 is located in the missing portion of the positioning piece 33 and the driver fitting portion 29 is fitted with the driver 30 of the drive lever 34 moves from the missing portion. The positioning piece fitting portion is fitted with the positioning piece 33, while the balance piece 25 in which the positioning piece fitting portion 28 has been fitted with the positioning piece 33 is exchanged to the lacking portion, and The driver fitting part is fitted with the driver 30. Thus, the balance 25 corresponding to the needle bar 5 arriving at the position driven by the needle bar drive mechanism 11 is moved to the balance drive mechanism.
Reaching the position driven by 35.

[0009]

In this conventional sewing machine, an embroidery pattern is usually sewn using one lower thread and one upper thread. With such a sewing method, the bulk of the pattern on the upper surface of the cloth is small. If the number of needles is inevitably increased to increase the bulk of the upper thread, the number of the lower thread also increases, and a layer of the lower thread is formed on the back surface of the cloth, so that the finished cloth becomes hard and lacks flexibility. Although it is conceivable to use a bulky thick yarn for the upper yarn, there is a problem that the fineness of the yarn is lacking and the texture is deteriorated. Furthermore, if two or three fine yarns are gathered or sweet-twisted and used for the upper yarn, bulking of the fine yarn only on the upper surface of the cloth without multiplying Various advantages can be obtained, for example, by threading or sewing a pattern having a good texture. However, when a plurality of upper yarns are put together or made into a sweet twist in order to pass through the threading hole 31 in the balance 25, even if one of the yarns is cut, if the other yarn is normal, the yarn is There is a problem that it becomes difficult to detect a breakage accident, and the sewing surface becomes rough due to partial breakage of the thread. Further, as the balance 25 oscillates up and down, the upper thread from the balance 25 to the needle 6 swings greatly. This shaking causes a plurality of upper threads to be entangled with each other, making it difficult to pass through the needle hole 6a, or causing a problem of forming a knob-like scratch on the upper surface of the cloth.

[0010] The sewing machine of the present application for sewing a plurality of upper threads together is provided to solve the above-mentioned problems of the prior art. The purpose of the present application is to use a plurality of upper yarns for the upper yarn and a smaller number of yarns for the lower yarn,
The number of stitches of the upper thread on the upper surface of the cloth is relatively large relative to the number of stitches, and the number of upper threads on the upper surface of the cloth can be increased without increasing the pattern of the upper thread without making the cloth too hard. To provide a sewing machine for sewing together. The other purpose is that even with a sewing machine that uses a plurality of upper threads and collects and sews the upper thread on the needle, in the process of heading from the thread supply source to the needle through the threading hole of the balance, each upper thread is It is possible to act alone, and if one of the upper threads is cut, one of the upper threads can be detected without being affected by the other threads, or the upper thread can be moved from the threading hole of the balance to the needle. An object of the present invention is to provide a sewing machine that collects and sews a plurality of upper threads that can be prevented from becoming entangled with other threads even when the thread is shaken. Other objects and advantages will be more readily apparent from the drawings and the following description associated therewith.

[0011]

A sewing machine according to the present invention for assembling and sewing a plurality of upper threads is provided with a lower thread feeder provided below a needle plate and a lower thread feeder provided above the needle plate. A vertically movable needle and a balance are provided. A plurality of upper threads guided from the upper thread supply source to the needles through the threading holes of the balance and a lower thread supplied from the shuttle are placed on the needle plate. In a sewing machine in which sewing is performed on a cloth by entanglement with each other at a position of a cloth to be placed, a threading hole provided at a front end of the balance has a number corresponding to the number of upper threads separated from each other. In this state, a plurality of upper threads for collective sewing supplied to the needle from the upper thread supply source are arranged side by side so as to be able to move up and down integrally, and each of the upper threads is passed through an individual threading hole in the balance. Through the gap with each other and then to the above needle Than it is. Further, using a lower thread supply shuttle provided below the needle plate, a vertically movable needle provided above the needle plate, and a balance, the upper thread supply source passes through the threading hole of the balance. In the sewing method in which a plurality of upper threads leading to the needle and a lower thread supplied from the shuttle are entangled with each other at the position of the cloth placed on the needle plate to sew the cloth, The number of the threading holes to be provided is a number corresponding to the number of the upper thread, and furthermore, the threading holes which are arranged apart from each other and capable of integrally moving up and down are used. A plurality of upper threads for collective stitching supplied from to the needle are passed through the respective threading holes in the balance in a state where a gap is provided between them, and then the needle is directed to the needle. A method of assembling and sewing a plurality of upper threads is provided.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. 1 to 4, functions, properties, characteristics, and the like of the components, members, and the like denoted by the same reference numerals as those in FIGS. Since it can be understood that this is the same as the above description, the duplicate description will be omitted. Needle bar support frame 4 shown in FIGS. 1 to 4 and balance support frame 21 integrated therewith
Is illustrated in the form of laterally moving in the horizontal direction with respect to the rotating type of FIG. 5, but the needle bar support frame of FIGS.
4. The structure for horizontally moving the balance support frame 21 is described in, for example,
5 and 6, as shown in Japanese Patent Publication No. 0-249085, etc., and the needle bar holding frame 4 shown in FIGS. 1 and 2 is rotated as shown in FIGS. The present invention can be implemented in a similar manner.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, reference numeral 2 denotes a sewing machine head, 44 is a thread take-up spring holding case mounted on the sewing machine frame 3, and 4 is a balance 25 mounted on the machine frame 3 so as to be able to move freely.
A holding frame such as a needle bar 5 and the like, and 1 indicates a needle plate having a needle hole 1a. Reference numeral 9 denotes a shuttle for supplying a lower thread provided below the needle plate 1. Above the needle plate, they are provided in parallel with the case 4, respectively.
Each of them comprises a plurality of vertically movable needle bars 5 and needles 6 attached thereto.

43 provided in the holding case 44 is provided in a path of a plurality of upper threads 45 (a, b, c) supplied from an upper thread supply source, for example, a bobbin (not shown) toward the needle 6. 1 shows a taken-up thread take-up spring (device). This works as known in the known thread breakage detecting device, for example, Japanese Patent Publication No. 52-31784. In this case, reference numeral 43b is a detection electrode which comes in contact with the spring 43a of the thread take-up spring 43 when the tension of the upper thread 45 decreases and outputs an electric signal. As shown schematically in FIG. 1, the thread take-up spring 43 has one end of a spring 43a connected to a fixing member (electrode of a conductive material),
The free end is constantly urged toward the detection electrode 43b, the middle of the spring is hooked on the upper thread 45, and when the thread breaks, the tip of the spring 43a contacts the detection electrode 43b and sends an electric signal to a continuous conducting wire, and the known Thus, the sewing machine is stopped by a control circuit (not shown). However, the upper thread 45 hung on the hook of the spring
When the tension is generated and the tensile force is generated, the conducting portion of the spring is separated from the detection electrode 43b, and the conduction is cut off. 42 is upper thread 45
1 shows a tension device having a well-known configuration for adjusting the tension of a tension. Reference numeral 44a denotes an overhanging plate extending from the case 44.
Is provided.

Next, a balance stored above the holding frame 4
25 is a mechanism having a free end provided with a threading hole 31 as shown in FIG.
35 makes it possible to swing up and down. Reference numeral 41 denotes a cloth-covered frame on which a cloth 41a to be sewn is sewn, and swings back and forth and right and left on the needle plate 1 as is well known. Next, 9a pulled out from the hook 9 indicates one or a lower thread number less than the upper thread number. An extension plate 40G for forming a threading hole (thread path) 40e is provided at the lower end of the holding case 4, and the threading holes (thread path) 40d, 40
Overhang plates 40H and 40I for forming b are provided.
A multi-head, multi-needle sewing machine having embroidery stitches having the above-described configuration, functions, and the like is widely known, and their operation and timing are also well-known (see, for example, JP-A-10-249085).

In the above construction, when the upper thread 45 and the lower thread 9a are normally supplied, the tension device 4 is widely used in a general embroidery sewing machine.
2. The sewing operation of the embroidery pattern is repeatedly performed with good timing among the members such as the thread take-up spring 43 (the upper thread breakage detecting device), the balance 25, the needle 6, the cloth tension frame 41, and the shuttle 9; Next, a threading hole (thread path) 31 provided at the tip of the balance 25 is provided.
The three pieces corresponding to the number of upper threads (for example, three pieces) are separated from each other via the projecting arm 25a as shown in FIG. Side by side,
The plurality of upper threads (45a, 45b, 45c) for collective sewing supplied from the upper thread supply source to the needles are respectively weighed by a balance 25.
Are passed through the respective threading holes (31, 31, 31) in a state in which a gap is provided between the individual threading holes (31, 31, 31) before being directed to the needle 6 described above. An assembly in which gaps are formed by passing through the plurality of threading holes (31, 31, 31) disposed at the front end of the balance 25 via a projecting arm 25a so as to be separated from each other. Needle thread for sewing (45
a, 45b, 45c) toward the needle 6, 3
Overhanging plates 40G and 40H are provided from the needle bar holding frame 4 so that the upper threads of the book can be separated from each other, and a plurality of thread paths (40d and 40e) are provided in these. Of course, these are arranged in the upper thread passage between the balance 25 and the needle 6 as shown.

The balance 25 in FIG.
Although two and three are illustrated on the left and right, the number of these threading holes 31 may correspond to the number of upper threads for collective sewing. Also, the two balances 25 on the left and right in FIG. 1 may be connected and integrated with each other so as to be synchronously moved up and down. Further, the method of selectively using the left and right needles 6 is, as is well known in the art, a needle bar holding frame 4 and a yarn path support frame 22.
Is reciprocated in the direction of arrow 37 to select. The description of the other operations and functions is the same as that described with reference to FIGS.

In the configuration shown in FIG. 1, the right side 3
The upper thread 45 (a, b, c) of the book is guided from a bobbin (not shown) to three tension devices 42, respectively, passes through the upper thread breakage detecting device 43, and the three thread paths 40b in the overhang plate 40I.
And enters the upper three yarn paths 31 of the balance 25 through the three yarn paths 40c, and the three yarn paths 40d and 40, respectively.
e, gathered in the needle hole 6a of the needle 6, and as shown in FIG. 4, the three upper threads gathered on the cloth 41a are sewn together. During this time, the three upper threads from the top bottle reach the needle hole 6a while being separated from each other, so that they do not entangle with each other. If one or two of the upper thread breaks, the upper thread breakage detecting device 43 in the middle detects the breakage promptly, and a well-known thread breakage treatment can be performed. It can be prevented from occurring.

[0019]

As described above, according to the present invention, the number of the upper yarns 45 is increased with respect to the number of the lower yarns 9a, and the number of the upper yarns is increased with respect to the number of the needles. There is an effect that can be.

Further, even when sewing is performed by passing a plurality of upper threads for collective sewing through the needle 6, the plurality of upper threads 45 (a, b, c) are separated from each other on a balance. It has the characteristic of vibrating up and down, and has an epoch-making effect in preventing adverse effects due to mutual interference of upper threads.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a multi-needle embroidery sewing machine in one of the multi-head sewing machines.

FIG. 2 is a schematic side view of the sewing machine of FIG. 1;

FIG. 3 is a perspective view of a main part of the balance.

FIG. 4 is a cross-sectional view of a sewn cloth.

FIG. 5 is a longitudinal sectional view showing a known structure of a multi-needle sewing machine.

FIG. 6 is a schematic cross-sectional view as viewed from below along the line II-II.

[Explanation of symbols]

 1 Needle plate 2 Head 3 Frame 4 Needle bar holding frame 5 Needle bar 6 Needle 7 Fabric holder 8 Spring 9 Hook 11 Needle bar drive mechanism 12 Guide rod 13 Lifting body 14 Needle bar holder 15 Drive shaft 16 Eccentric wheel 17 Crank rod 18 Lever 19 Link 20 Balance device 21 Balance support frame 22 Thread path support frame 25 Balance 26 Support shaft 27 Connecting piece 28 Positioning piece fitting part 29 Driver fitting part 30 Driver 31 Threading hole 32 Cam groove 33 Positioning piece 34 Drive lever 35 Balance drive mechanism 41 Upholstered frame 42 Tension device 43 Upper thread breakage detector 44 Thread take-up spring holding case 45 Upper thread

Claims (4)

[Claims] 1. A shuttle for supplying a lower thread provided below a needle plate, a needle movable up and down provided above the needle plate, and a balance, and threading the balance from the upper thread supply source. In a sewing machine device in which a plurality of upper threads guided to the needle through the holes and a lower thread supplied from the shuttle are entangled with each other at a position of the cloth placed on the needle plate to perform sewing on the cloth, The threading holes provided at the tip of the balance are arranged in parallel with each other in a state in which a number corresponding to the number of upper threads is separated from each other, and can be integrally moved up and down. A plurality of needles for collective sewing supplied toward the needles are passed through the respective threading holes in the balance with a gap therebetween, and then are directed to the needles. A sewing machine that collects and stitches a plurality of upper threads. 2. A plurality of upper threads for collective sewing, each having a gap formed therebetween by passing through a plurality of threading holes arranged at a distance from each other at the tip of the balance, toward the needle. 2. A plurality of yarn paths according to claim 1, wherein a plurality of yarn paths are arranged in an upper yarn passage between the balance and the needle so that the upper yarns can be separated from each other in the process. A sewing machine that collects and stitches threads. 3. A plurality of upper threads for collective sewing, each of which is directed from the upper thread supply source to a needle through a threading hole provided at a leading end of the balance while being separated from each other,
3. The sewing machine according to claim 1, further comprising a separate upper thread breakage detecting device. 4. A threader for feeding the lower thread from a needle thread supply source using a shuttle for supplying a lower thread provided below the needle plate, a vertically movable needle provided above the needle plate, and a balance. In the sewing method, a plurality of upper threads leading to the needle through the hole and a lower thread supplied from the shuttle are entangled with each other at a position of the cloth placed on the needle plate to perform sewing on the cloth. The number of the threading holes provided at the front end is a number corresponding to the number of the upper thread, and is used in a state where they are separated from each other and are arranged side by side so as to be able to move up and down integrally. A plurality of upper threads for collective sewing supplied from the thread supply source to the needle,
A method for assembling and sewing a plurality of upper threads, wherein each thread is passed through a state in which a gap is provided between individual threading holes in a balance, and then the needle thread is directed toward the needle.