JP3876015B2 - Sewing machine bird's nest prevention device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a nest generation anti TomeSo location bird sewing machine, particularly to a nest generation anti TomeSo location bird sewing machine capable of preventing the occurrence of bird nest by the yarn end of the yarn at the sewing start .
[0002]
[Prior art]
2. Description of the Related Art Conventionally, sewing machines, particularly industrial sewing machines, that are provided with a thread cutting device that automatically cuts upper and lower threads after sewing are frequently used for reasons such as improving sewing efficiency.
[0003]
Such a conventional thread cutting device for a sewing machine, for example, cuts a thread (upper thread and lower thread) by making a movable blade and a fixed blade that can be moved in and out freely movable with respect to the movement path of the needle. It is.
[0004]
In a sewing machine equipped with such a conventional thread cutting device, as shown in FIG. 11, for example, a thread 3 formed on a cloth 1 as a sewing product (the thread 3 is a generic term for an upper thread 3a and a lower thread 3b). The ends of the upper thread 3a and the lower thread 3b at the start of sewing may be entangled together at the seam 2 on the lower side of the cloth, and a so-called bird's nest 4 may be generated. The upper thread 3a and the lower thread at the start of sewing may occur. When the bird's nest 4 is formed by both ends of the yarn 3b, there is a problem that in addition to poor appearance, it gives a stiff feeling, impairs the texture of the sewing product and lowers the quality of the sewing product.
[0005]
In order to cope with such problems, as shown in FIG. 12, the length of the upper thread 3a at the start of sewing is controlled to be short, and the thread end of the upper thread 3a at the start of sewing comes out below the cloth. The thread end control method for shortening the amount (length), or the thread of the upper thread 3a at the start of sewing after holding the thread end of the upper thread 3a at the start of sewing as shown in FIG. A thread end cutting method for cutting the end short has been proposed.
[0006]
However, the above-described thread end control method has a problem in that the stitch 2 by the upper thread 3a and the lower thread 3b is not formed by the first needle, and the start of sewing is skipped on the cloth lower side. In the above-described thread end cutting method, the stitch 2 is formed by the upper thread 3a and the lower thread 3b by the first needle, but in both cases, the lower thread 3b at the start of sewing becomes the stitch 2 on the fabric lower side. There is a problem that the bird's nest 4a may be generated by the thread end of the lower thread 3b at the start of sewing. Furthermore, in both cases, the thread end of the thread 3 at the start of sewing is merely held by the cloth 1 due to the frictional force between the thread 3 penetrating the cloth 1 and the cloth 1, for example, by a light force from the outside. The upper thread 3a and the lower thread 3b easily come off from the cloth 1 as shown by phantom lines in FIGS. 12 and 13, that is, the thread 3 at the seam 2 at the start of sewing comes off from the cloth 1 and the thread 3 In order to prevent the yarn 3 from fraying, there has been a problem that reverse stitching must be performed at the start of sewing as shown in FIG.
[0007]
Therefore, as shown in FIG. 15, in order to prevent fraying of the bird's nest 4 and the thread 3 at the start of sewing due to the thread end of the thread 3 at the start of sewing, a thread is attached to the thread end of the upper thread 3a at the start of sewing. There has been proposed a method in which a knot 5 called a ball is formed and the knot 5 is sewn into the cloth 1 to form the seam 2.
[0008]
[Problems to be solved by the invention]
However, the seam 2 in which the knot 5 formed on the thread end of the upper thread 3a is sewn, as shown in FIG. 15, the lower thread 3b at the start of sewing is entangled with the seam 2 on the lower side of the fabric, There has been a problem in that the occurrence of the bird's nest 4a due to the yarn end of the yarn 3b may not be reliably prevented.
[0009]
The present invention has been made in view of these points, to provide a nest generation anti TomeSo location bird sewing machine capable of preventing the occurrence of bird nest by the yarn end of the yarn at the sewing start Objective.
[0010]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the feature of the bird's nest generation prevention device according to claim 1 of the present invention is that the tip can be opened and closed in order to capture and hold the upper and lower threads. A thread holding means comprising a thread gripper, thread connecting means for forming a knot connecting the ends of the upper and lower threads captured and held by the thread holding means, and at least the upper and lower thread ends at the start of sewing In advance, the sewing machine is stopped at a position where the upper and lower threads can be simultaneously captured and held, and the thread gripper catches and holds the thread ends of the upper and lower threads, and the thread coupling means holds and holds the thread. And control means for controlling to form a knot that connects the ends of the captured upper and lower yarns. It is preferable that the thread holding means includes a thread clamp actuator that drives the thread clamp body to be freely opened and closed, and a swing arm that moves the thread clamp body to a position for capturing and holding the upper and lower threads.
[0011]
Further, the bird's nest generation prevention device of the sewing machine according to claim 3 of the present invention is characterized in that a wiper that catches a thread located above a needle plate and a thread end of the thread that is caught by this wiper A thread holding means having a clamp for holding the thread, a thread connecting means for forming a knot that connects the ends of the upper and lower threads captured and held by the thread holding means, and at least the upper and lower threads at the start of sewing In order to preliminarily connect the thread ends of the thread, the sewing machine is stopped at a position where the upper thread can be captured and held, and the upper thread located above the needle plate is captured by the wiper. After holding the end with the clamp, drop the needle by one stitch, pull the lower thread with the upper thread to the upper side of the cloth and position it above the needle plate, and then drive the wiper to pull the upper side of the cloth And catch the end of the captured lower thread. The upper end of the upper thread held by the clamp is held by the clamp, and the knots connecting the upper and lower thread ends held and captured by the thread coupling means are formed above the needle plate. And a control means for controlling the thread holding means and the thread coupling means .
[0012]
Then, more nests prevention equipment for sewing machines bird of the invention, the yarn of the upper and lower yarn ends of the upper yarn and the lower yarn at the sewing start is bound in advance to form a knot linked with the yarn end it can. Then, by sewing with the upper and lower thread ends joined together, it is possible to reliably prevent the occurrence of bird's nest by the thread ends at the start of sewing without fraying the threads at the start of sewing. .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings. In addition, about the structure which is the same as that of the conventional thing mentioned above, or equivalent, the same code | symbol is attached | subjected in drawing, and the description is abbreviate | omitted.
[0014]
For nest generation anti TomeSo embodiment of location of the sewing machine of birds according to the present invention, the coupling of the upper and lower yarn of the yarn end, obtained by forming a knot consisting of upper and lower yarn to the yarn end of the upper and lower yarns as An example will be described.
[0015]
3 from FIG. 1 shows an essential part of an example of embodiment of the nest generation anti TomeSo location bird sewing machine according to the present invention, FIG. 1 is a perspective view, FIG. 2 is a front view, FIG. 3 It is a top view of the principal part of a thread | yarn holding means.
[0016]
As shown in FIG. 1, a bird's nest generation prevention device (hereinafter simply referred to as a bird's nest generation prevention device) 6 of the sewing machine of the present embodiment includes an upper thread 3a hung on a needle 7 and the upper thread. The sewing machine is attached to a general sewing machine body 8 for sewing a lower thread 3b entangled with 3a into, for example, a cloth 1 as a substantially sheet-like sewing product.
[0017]
As shown in FIGS. 1 and 2, the bird's nest generation preventing device 6 includes a thread holding means 9 for capturing and holding the upper and lower threads 3, and the upper and lower threads 3 captured and held by the thread holding means 9. Yarn knotting means 11 for forming a knot 10 composed of upper and lower yarns 3 which will be described later is called a yarn ball as a yarn coupling means for coupling yarn ends.
[0018]
The thread holding means 9 grips the upper and lower threads 3 located between the needle plate 12 and the shuttle 14, pulls the gripped upper and lower threads 3 to the side of the shuttle 14, and pulls the upper and lower threads 3 into the shuttle 14. It can be stretched to the side of
[0019]
More specifically, the thread holding means 9 is supported at the base end thereof by an output shaft (not shown) of a wiper drive motor 13 disposed below the needle plate 12 of the sewing machine body 8. As shown by A, the tip (free end) has a substantially L-shaped swing arm 15 that reciprocates to the yarn ends of the upper and lower yarns 3 located between the needle plate 12 and the shuttle 14. . As shown in detail in FIG. 3, the tip of the swing arm 15 has a thread gripping body 16 whose tip for catching and holding the yarn ends of the upper and lower yarns 3 can be opened and closed like a heel, and this A thread clamp actuator 17 made of, for example, a solenoid for driving the thread clamp body 16 so as to be freely opened and closed is provided.
[0020]
The thread gripping body 16 is opened when the swinging arm 15 moves toward the thread ends of the upper and lower threads 3 located between the needle plate 12 and the shuttle 14 and is near the thread ends of the upper and lower threads 3. When the upper and lower yarns 3 are captured, the upper and lower yarns 3 are closed to hold the yarn ends of the upper and lower yarns 3. When the swing arm 15 returns to the original position in this state, the yarn ends of the upper and lower yarns 3 are moved to the hook 14. The upper and lower yarns 3 can be stretched to the side of the shuttle 14 as shown by broken lines in FIG.
[0021]
The yarn holding means 9 may be selected from various types that have already been proposed according to the design concept and the like, and is not particularly limited to the configuration of the yarn holding means 9 of the present embodiment. Absent.
[0022]
The yarn knotting means 11 is disposed at a position in contact with the upper and lower threads 3 stretched to the side of the hook 14 by the thread holding means 9, and the upper and lower threads 3 stretched to the side of the hook 14. A loop is formed by entanglement, and the thread holding means 9 side of the ring formed by the upper and lower threads 3 is cut, and the thread ends on the hook 14 side of the cut upper and lower threads 3 are grasped to move up and down through the rings. A knot 10 composed of upper and lower yarns 3 to be described later, in which the yarns 3 are connected at the yarn ends, can be formed.
[0023]
More specifically, the yarn knotting means 11 forms a ring by entwining the upper and lower threads 3 stretched to the side of the hook 14 and the thread holding means 9 side of the ring formed by the upper and lower threads 3 is formed. A thread knot 18 for cutting and forming a knot 10 composed of the upper and lower threads 3 connected to the upper and lower threads 3 through the ring by grasping the thread ends of the upper and lower threads 3 on the hook 14 side. Have.
[0024]
The thread knot 18 is arranged around the rotation center line that is disposed below the needle plate 12 of the sewing machine body 8 and is substantially perpendicular to the upper and lower threads 3 that are stretched to the side of the shuttle 14 by the thread holding means 9. The rotary shaft 19 is rotatable, and the claw portion 20 is bent and extended in a direction perpendicular to the axial direction of the rotary shaft 19 from the tip of the rotary shaft 19. The proximal end of the rotary shaft 19 is supported by an output shaft (not shown) of the yarn knot driving motor 21.
[0025]
The yarn tying means 11 may be selected from various types that have already been proposed according to the design concept and the like, and is not particularly limited to the configuration of the yarn tying means 11 of the present embodiment. Absent.
[0026]
Further, at a desired position of the sewing machine body 8, at least the thread holding means 9 and the thread knotting means 11 are controlled so that a knot 10 made of the upper and lower threads 3 is formed at the thread ends of the upper and lower threads 3 at the start of sewing. A control means (not shown) including at least a CPU, a memory formed by an appropriate capacity ROM, RAM, etc., and various drivers (controllers) for driving each unit is provided. Yes.
[0027]
Will now be described with reference to the FIGS. 1-6 with the action of the nest preventer bird sewing machine described above.
[0028]
FIG. 4 is an explanatory view showing a yarn path that can simultaneously capture and hold the upper and lower yarns by the yarn holding means, and FIG. 5 is formed at the yarn ends of the upper and lower yarns by the bird's nest generation preventing device of this embodiment. FIG. 6 is an explanatory view showing a knot made of upper and lower threads, and FIG. 6 is an explanatory view showing a seam in which a knot made of upper and lower threads is sewn on the ends of the upper and lower threads by the bird's nest generation preventing device of this embodiment. FIG.
[0029]
According to the bird's nest generation preventing apparatus 6 of the present embodiment, when the sewing machine is activated, it is caught by the sword tip 22 of the hook 14 in the first stitch based on a control command sent from a control means (not shown). The upper thread 3a crossing the hook 14 and the lower thread 3b fed from the hook 14 stop at a position where they can be simultaneously captured and held by the thread holding means 9. FIG. 4 shows a yarn path in which the upper and lower yarns 3 can be simultaneously captured and held by the yarn holding means 9.
[0030]
Next, the thread holding means 9 captures and holds the upper and lower threads 3 located between the needle plate 12 and the shuttle 14, and the upper and lower threads 3 are located on the side of the shuttle 14 as indicated by broken lines in FIG. To pull the upper and lower threads 3 to the side of the hook 14.
[0031]
Next, the thread knotting means 11 creates a ring by entwining the upper and lower threads 3 stretched to the side of the hook 14, and cuts the thread holding means 9 side of the ring formed by the upper and lower threads 3, Further, a knot 10 composed of the upper and lower threads 3 in which the upper and lower threads 3 are connected at the thread ends through the ring is formed below the needle plate 12 by grasping the thread ends of the cut upper and lower threads 3 on the hook 14 side. That is, the yarn knot means 11 can reliably form the knot 10 made of the upper and lower yarns 3 at the yarn ends of the upper and lower yarns 3. A knot 10 called a yarn ball formed below the needle plate 12 is shown in FIG.
[0032]
Next, when the knots 10 are formed at the ends of the upper and lower threads 3, the sewing operation is started, and the stitches 2 in which the knots 10 are sewn are formed at the start of sewing of the cloth 1 as a sewing product. FIG. 6 shows a seam 2 in which a knot 10 formed by the bird's nest generation preventing device 6 according to this embodiment is sewn.
[0033]
According to the bird's nest generation preventing apparatus 6 of the present embodiment having such a configuration, as shown in FIG. 6, the upper thread 3a at the start of sewing is added to the seam 2 formed by the thread 3 formed on the cloth 1. Not only the end but also the thread end of the lower thread 3b at the start of sewing is not sewn into the seam 2, and the bird's nest 4 is generated by the thread ends of the upper thread 3a and the lower thread 3b at the start of conventional sewing. It can be surely prevented.
[0034]
Further, according to the bird's nest generation preventing device 6 of the present embodiment, the yarn ends of the upper and lower yarns 3 can be connected by the knot 10, so that the conventional yarn 3 comes off from the cloth 1 and the seam 2 frays. It is possible to reliably prevent the yarn 3 from fraying.
[0035]
That is, according to the bird's nest generation prevention device 6 of the present embodiment, the fraying of the thread 3 can be more reliably prevented and the occurrence of the bird's nest 4 can be surely prevented. There is an effect that the quality of the sewing product can be surely improved without impairing the sewing machine.
[0036]
Furthermore, the bird's nest generation preventing device 6 according to the present embodiment is disposed below the needle plate 12 and does not interfere with the cloth 1 placed on the upper surface of the needle plate 12, so that it can be used at the time of sewing. Smooth sewing work can be performed without narrowing the operator's work space.
[0037]
10 from FIG. 7 shows another example of the embodiment of the nest generation anti TomeSo location bird sewing machine according to the present invention, the nest prevention device 6a bird of the present embodiment, the needle plate 12 It has a thread holding means 9a and a thread knotting means (not shown) disposed above (not shown).
[0038]
The thread holding means 9a includes a wiper 25 that captures the thread 3 positioned above the needle plate 12 that has already been proposed, and a clamp 26 that retains the thread end of the thread 3 captured by the wiper 25. Yes. Other configurations are the same as those of the above-described embodiment.
[0039]
The yarn holding means 9a and the yarn knotting means can be selected from various types that have already been proposed according to the design concept.
[0040]
As shown in FIG. 7, the operation of the bird's nest generation preventing apparatus 6a according to the present embodiment having such a configuration is as follows. First, the upper thread 3a located above the needle plate 12 is captured by the wiper 25. The thread end of the captured upper thread 3 a is held by the clamp 26. Next, as shown in FIG. 8, the needle 7 is dropped by one stitch, and the upper thread 3 a and the lower thread 3 b are pulled out above the cloth and positioned above the needle plate 12. Next, as shown in FIG. 9, the wiper 25 is driven to catch the lower thread 3b drawn to the upper side of the cloth, and together with the thread end of the upper thread 3a already holding the captured thread end of the lower thread 3b. Hold by clamp 26. Next, as shown in FIG. 10, a yarn knot device (not shown) is driven to form a knot 10 in which the upper and lower yarns 3 are connected at the yarn ends above the needle plate 12. Then, when the knot 10 composed of the upper and lower threads 3 is formed at the ends of the upper and lower threads 3 as described above, the sewing operation is started, and the above-described implementation shown in FIG. A seam 2 is formed by sewing a knot 10 similar to the form.
[0041]
The operation of the bird's nest generation preventing apparatus 6a according to the present embodiment is similar to that of the above-described bird's nest generation preventing apparatus 6 in that at least a CPU disposed at a desired position of the sewing machine body 8 has an appropriate capacity. It is controlled by a control means (not shown) provided with a memory formed by ROM, RAM, etc., and various drivers (controllers) for driving each unit.
[0042]
Therefore, according to the bird's nest generation preventing device 6a of the present embodiment, not only the thread end of the upper thread 3a at the start of sewing but also the lower thread at the start of sewing is added to the seam 2 by the thread 3 formed on the cloth 1. The thread end of 3b is not sewn into the seam 2 and the occurrence of the bird's nest 4 due to the thread ends of the upper thread 3a and the lower thread 3b at the start of conventional sewing can be reliably prevented, and the upper and lower threads 3 Therefore, it is possible to reliably prevent the fraying of the yarn 3 such that the conventional yarn 3 comes off the cloth 1 and the seam 2 is frayed.
[0043]
That is, according to the bird's nest generation preventing apparatus 6a of the present embodiment, as with the nest generation preventing apparatus 6 of the above-described embodiment, fraying of the yarn 3 is surely prevented and the occurrence of the bird's nest 4 is generated. Therefore, the quality of the sewn product can be reliably improved without impairing the texture of the sewn product.
[0044]
The knot 10 forming operation by the control means of the bird's nest generation preventing apparatus 6 and the knot 10 forming operation by the control means of the bird's nest generation preventing apparatus 6a are different from each other, but the knot 10 to be stored in the memory is different. The necessary knot 10 forming operation can be easily obtained by changing a program for forming the knot.
[0045]
In a sewing machine (not shown) having a plurality of needles 7 such as a two-needle sewing machine, a knot is formed so as to connect the yarn ends of the plurality of upper threads 3a. Fraying can be prevented.
[0046]
Furthermore, in each of the above-described embodiments, as a method of connecting the yarn ends of the upper and lower yarns 3, a method of forming the knot 10 composed of the upper and lower yarns 3 on the yarn ends of the upper and lower yarns 3 is used. As methods for joining the yarn ends of the upper and lower yarns 3, the upper and lower yarns 3 are connected to each other and the upper and lower yarns 3 are connected to each other. A method of welding the yarn ends may be used. When the method of bonding the yarn ends of the upper and lower yarns 3 is used as a method of bonding the upper and lower yarns 3, the yarn bonding means (not shown) is used as the yarn bonding means, and the upper and lower yarns are bonded. When using the method of welding the three yarn ends, a yarn welding means (not shown) may be used as the yarn joining means.
[0047]
Furthermore, the present invention is not limited to the embodiments described above, and can be modified as necessary.
[0048]
【The invention's effect】
According to the nest generation anti TomeSo location of birds of the sewing machine of the present invention as described above, it is possible to pre-couple the yarn end of the upper and lower thread, it is possible to reliably prevent the occurrence of bird nest In addition, there is an excellent effect that the quality of the sewing product can be reliably improved without impairing the texture of the sewing product.
[Brief description of the drawings]
[1] of the sewing machine according to the present invention birds an embodiment of nest generation anti TomeSo location perspective view of a main part Figure 2 is a front view of FIG. 1 FIG. 3 of the thread holding means of Figure 1 FIG. 4 is an explanatory view showing a thread path that can simultaneously capture and hold the upper and lower threads by the thread retaining means of FIG. 1. FIG. 5 Explanatory drawing which shows the knot which consists of the upper and lower yarns formed in the thread | yarn end of a thread | yarn. FIG. 6 explanatory view showing a stitch sewn to Figure 7 is an explanatory view showing the state of holding the yarn on the other example of the embodiment of the nest generation anti TomeSo location of the sewing machine of birds in accordance with the present invention Figure 8 Figure FIG. 9 is a view similar to FIG. 7 showing the progress of the operation state of the bird's nest generation prevention device of FIG. 7 following FIG. 7; FIG. 10 is a view similar to FIG. 7 showing the progress of the operation state of the nest generation prevention device following FIG. 8. FIG. 10 shows the progress of the operation state of the bird's nest generation prevention device of FIG. Fig. 11 is an explanatory view showing a sewing state with a bird's nest generated by upper and lower threads at the start of conventional sewing. Fig. 12 is a diagram of a bird generated by lower thread at the start of conventional sewing. Explanatory diagram showing fraying of nest and lower thread [FIG. 13] Explanatory diagram showing fraying of bird's nest and upper and lower threads caused by lower thread at the start of conventional sewing [FIG. 14] Preventing conventional fraying of thread Explanatory drawing showing the reverse stitch for sewing [FIG. 15] Explanatory drawing showing a seam in which a knot formed on the end of the conventional upper thread is sewn [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cloth 2 (as sewing product) Seam 3 Thread 3a Upper thread 3b Lower thread 6, 6a Sewing bird nest generation prevention device 7 Needle 9, 9a Thread holding means 10 Knot 11 Thread tying means (as thread coupling means)

Claims (3)

A thread holding means comprising a thread gripper whose tip can be freely opened and closed to capture and hold the upper and lower threads;
A thread coupling means for forming a knot that connects the ends of the upper and lower threads captured and held by the thread retaining means;
In order to join at least the upper and lower thread ends at the start of sewing in advance, the sewing machine is stopped at a position where the upper and lower threads can be simultaneously captured and held, and the thread gripper catches the upper and lower thread ends. holds, nest preventer bird sewing machine, characterized in that a control means for controlling to form a knot linked the yarn end of the yarn of the upper and lower said yarn joining means is held and trapped. The yarn holding means,
A thread clamp actuator that opens and closes the thread clamp body; and
The apparatus according to claim 1, further comprising a swing arm that moves the thread gripper to a position where the upper and lower threads are captured and held. Thread holding means comprising a wiper that captures a thread located above the needle plate, and a clamp that holds a thread end of the thread captured by the wiper;
Thread coupling means for forming and coupling knots connecting the yarn ends of the upper and lower threads captured and held by the thread holding means;
In order to connect at least the upper and lower thread ends at the start of sewing in advance, the sewing machine is stopped at a position where the upper thread can be captured and held, and the upper thread positioned above the needle plate is captured by the wiper. After holding the thread end of the captured upper thread with the clamp, the needle is dropped by one stitch and the lower thread is pulled out above the cloth with the upper thread to be positioned above the needle plate, and then the wiper To capture the lower thread pulled out to the upper side of the cloth, and hold the captured thread end of the captured lower thread together with the thread end of the upper thread already held by the clamp, and the thread coupling means And a control means for controlling the thread holding means and the thread coupling means so as to form a knot connecting the ends of the captured upper and lower threads above the needle plate. Nest generation prevention device.

Images