JPH0736635Y2 - Structure of bobbin bobbin in horizontal hook - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a horizontal hook of a sewing machine, and relates to a lower thread bobbin structure of the horizontal hook.

[Problems to be solved by conventional techniques and devices]

In the horizontal hook type sewing machine, as shown in FIGS. 4 to 6, the lower thread bobbin 50 is housed in the inner hook 25 fitted in the outer hook 15 of the horizontal hook, and the lower thread T2 is fed from the lower thread bobbin 50. It is pulled out from the lower thread tension applying portion 30 of the inner hook 25 and guided to the needle hole of the needle plate (not shown). The lower thread tension applying section 30 is composed of a thread tension body 26, a thread tension spring 27, a thread tension adjusting screw 28, and an attaching screw 29. There are two points that are particularly important in connection with sewing with the bobbin thread bobbin of the horizontal hook. The first point is that the bobbin thread bobbin is
The second point is to prevent the idle threading of 50 due to inertia or the like, and the second point is to be able to detect the remaining amount of the bobbin thread wound around the bobbin thread bobbin during sewing. First, the prevention of idle rotation of the lower thread bobbin at the first point will be described. Conventionally, this type of horizontal shuttle type sewing machine has a problem in that the bobbin thread bobbin 50 accommodated in the inner hook of the horizontal shuttle during the operation of the sewing machine becomes idle when the idle thread bobbin 50 spins due to inertia or the like. That is, when the lower thread bobbin idles, the lower thread is loosened in the bobbin chamber as shown by the alternate long and short dash line in FIG. Compared to the state in which the bobbin thread bobbin 50 is not spinning and the bobbin thread is tense, the driving force of the bobbin thread bobbin 50 is not required when the bobbin thread T2 is pulled out by the balance. The tension of the lower thread is increased and the lower thread is pulled out by the upper thread. In many cases, idle rotation of the bobbin thread bobbin 50 occurs randomly, and as a result, as shown in FIGS. 7A and 7B, the amount of withdrawal of the bobbin thread T2 by the upper thread T1 is large. Occurs and the thread tightening becomes uneven. Conventionally, as a measure to prevent the bobbin thread bobbin 50 from slipping, for example, as disclosed in Japanese Utility Model Laid-Open No. 62-139485, a contact portion with the bobbin thread bobbin is made of a high friction material in a bobbin case of a vertical hook type hook. There is one in which a high-friction material is brought into contact with the lower thread bobbin by a spring force from the thrust direction of the lower thread bobbin by the formed elastic member to brake the lower thread bobbin. However, in this method, one flange portion of the bobbin thread bobbin 50 is a free end in the horizontal shuttle, and it is not sufficient to prevent the bobbin from idling. Next, as a second point, the detection of the remaining amount of the lower thread wound on the lower thread bobbin will be described. When the bobbin thread wound around the bobbin thread bobbin disappears during sewing, the stitch becomes discontinuous, which is inconvenient.
is important. Optical methods, mechanical methods, and visual methods are known as methods for detecting the amount of lower thread remaining in a horizontal hook. The visual method is to detect the lower thread bobbin, the required part of the needle plate, and the lower thread bobbin. This is a transparent method that allows you to visually check the remaining amount of the bobbin thread wound on the bobbin bobbin. Compared to the other two methods, it does not require sensors, contacts, or their associated circuits, and the configuration is simple. Moreover, there is an advantage that there is no fear of failure. As described above, in connection with the sewing with the bobbin thread bobbin of the horizontal hook, it is particularly important to prevent the bobbin thread bobbin from slipping and to detect the remaining amount of the bobbin thread. For this reason, there has been disclosed a technique for solving either one of prevention of idling of the lower thread bobbin and detection of the remaining amount of the lower thread. However, there has been no technology that solves both the prevention of idle rotation of the lower thread bobbin and the detection of the remaining amount of the lower thread. The problem to be solved by the present invention is to provide a structure of a lower thread bobbin capable of preventing idle rotation of the lower thread bobbin and visually confirming the remaining amount of the lower thread.

[Means for Solving the Problems and Functions of the Invention]

The present invention, in order to solve the problems of the prior art described above,
In a horizontal hook of a sewing machine, a transparent portion is provided on a flange portion of a bobbin thread bobbin, and an opaque portion is provided inside and outside the transparent portion.
By the frictional force between these opaque parts and the inner hook, the bobbin thread bobbin is prevented from idling, and these opaque parts give a reference to an appropriate range of the remaining amount of bobbin thread visually confirmed to the transparent parts. So, specifically, the opaque part of the bobbin bobbin is subjected to graining to increase the friction coefficient with the inner hook,
In addition, elastic polyurethane beads are dispersed in the opaque part of the bobbin bobbin in the acrylic base material paint to increase the friction coefficient with the inner pot to which fine powder is added to increase the friction coefficient or in the soft polyurethane paint. The horizontal hook of the sewing machine in which the magnetic material is applied to the bottom of the inner hook of the horizontal hook to prevent the inner hook from floating due to the magnetic force of the magnet provided on the outer hook. , A transparent portion is provided on the flange portion of the bobbin bobbin, and opaque portions are provided inside and outside the transparent portion. Magnetic fine powder is applied to these opaque portions and the magnetic material at the bottom of the inner pot lowers the magnetic force. Along with applying braking force to the thread bobbin, these opaque parts provide a reference for the appropriate range of the remaining amount of bobbin thread visually confirmed against the transparent part, and furthermore, magnetic material is attached to the bottom of the inner hook of the horizontal hook. Provided on the outer pot In a horizontal hook of a sewing machine configured to prevent the inner hook from moving due to a magnetic force of a magnet, a transparent portion is provided on a flange portion of a bobbin thread bobbin, and annular opaque portions are provided inside and outside the transparent portion, respectively. Fine powder of magnetic material is applied to these opaque parts, and a braking force is applied to the bobbin thread bobbin by the attractive force with the magnet of the outer pot, and these opaque parts are visually confirmed against the transparent part. According to the present invention, there is provided a bobbin thread bobbin adapted to provide a standard for a proper amount range. According to the present invention, a transparent portion is provided on a flange portion of the bobbin thread bobbin, and annular opaque portions are provided inside and outside the transparent portion. Since these opaque parts are used to prevent the bobbin thread bobbin from idling in the bobbin chamber and give a reference to an appropriate range of the bobbin thread remaining amount visually confirmed to the transparent part, the bobbin thread Due to bobbin spinning Prevents irregular seam, there is effect that a visual check of the lower thread remaining even a beginner is possible form a good seam by uniform thread tightening can be easily and accurately.

【Example】

Hereinafter, the present invention will be described with reference to examples. In FIG. 2, the flange portion 41 of the bobbin thread bobbin 40 is provided with a transparent portion 42 and remaining opaque portions 43 and 44, which indicate that the bobbin thread is properly wound in that range. . These opaque areas are the result of the processing or coating application described below. The outer diameter of the inner opaque portion 43 is set to be slightly larger than the outer diameter of the minimum winding amount of the bobbin thread T2, and the inner diameter of the outer opaque portion 44 is the maximum winding amount of the bobbin thread T2. The inner diameter is set to be slightly smaller than the outer diameter. The opaque portions 43 and 44 are designed to have a large friction coefficient particularly by the embossing process or the application of the paint, and increase the rotation resistance between the contact portion of the bobbin chamber of the inner hook 20 and the idling of the lower thread bobbin 40. It is designed to prevent it. The paint applied to the opaque portions 43 and 44 is a so-called blackboard paint in which an acrylic base material paint is added with fine powder for increasing the friction coefficient. In addition to this, as a paint having a large friction coefficient, it is possible to use a paint in which elastic polyurethane beads are dispersed in a soft polyurethane paint. As shown in FIG. 3, a magnetic material (material having a property of being attracted by a magnetic force) is used for the bottom of the inner pot 21, and the magnetic force of the magnet 11 provided in the outer pot 10 causes the inner pot 21 to move. In a horizontal hook with a structure that prevents loose movement, fine magnetic powder is applied to the opaque parts 47 and 48 of the bobbin thread bobbin 45 and the lower thread bobbin is controlled by the attraction force with the magnetic material 22 at the bottom of the inner hook 21. Can be powered. In this case, the transparent portion 46 and the opaque portion 47 of the lower thread bobbin 45,
The dimensional elements of 48 are transparent parts 42 of the bobbin bobbin 40 shown in FIG.
The same as the opaque portions 43 and 44. As another method, the remaining opaque portion of the bobbin bobbin 45 is
By applying a fine powder of magnetic material to 47 and 48,
It is also possible to similarly apply a braking force to the lower thread bobbin 45 by the attraction force of the magnet 11 of the ten.

[Effect of device]

As described above, according to the present invention, the flange portion of the bobbin thread bobbin is provided with the transparent portion, and the annular opaque portions are provided inside and outside the transparent portion. It is used to prevent idling and provides a standard for the proper range of the bobbin thread remaining amount that is visually confirmed on the transparent part, so uneven stitches due to bobbin bobbin idling can be prevented and uniform thread can be prevented. It is possible to form good seams by tightening and to easily and accurately confirm the remaining amount of the bobbin thread even by a beginner.

[Brief description of drawings]

1 to 3 relate to an embodiment of the present invention. FIG. 1 is a vertical sectional view of a horizontal hook, FIG. 2 is a perspective view of a bobbin thread bobbin, and FIG. 3 is FIG. 1 and FIG. FIG. 6 is a vertical cross-sectional view of a horizontal hook according to another embodiment. 4 to 7 relate to a conventional example, FIG. 4 is a plan view of a horizontal hook, FIG. 5 is a vertical sectional view of the horizontal hook, FIG. 6 is an exploded perspective view of a tension applying member, and FIG. It is a schematic diagram of the formed seam. 10 is an outer hook, 11 is a magnet provided on the outer hook, 20 and 21 are inner hooks, 22 is a magnetic material at the bottom of the inner hook, 40 and 45 are bobbin bobbins, 41 is a flange section, 42 and 46 are transparent sections, 43, 44, 47 and 48 are opaque parts.

Claims (5)

[Scope of utility model registration request] 1. In a horizontal shuttle of a sewing machine, a transparent portion is provided on a flange portion of a bobbin thread bobbin, and annular opaque portions are provided inside and outside the transparent portion, respectively, and friction force between the opaque portion and the inner shuttle is provided. The structure of the bobbin bobbin of the horizontal shuttle is characterized in that the bobbin bobbin is prevented from idling and the opaque portion provides a reference for an appropriate range of the bobbin thread remaining amount visually confirmed with respect to the transparent portion. 2. The structure of the bobbin bobbin of the horizontal hook according to claim 1, wherein the opaque portion of the bobbin bobbin is subjected to a texture treatment for increasing a coefficient of friction with the inner hook. 3. A paint obtained by adding fine powder for increasing the friction coefficient to an acrylic base material paint for increasing the friction coefficient with the inner pot on the opaque portion of the bobbin bobbin or an elastic polyurethane for the soft polyurethane paint. A bobbin structure for a horizontal bobbin according to claim I, characterized in that a paint in which beads are dispersed is applied. 4. A bobbin thread flange for a bobbin thread in a horizontal hook of a sewing machine, wherein a magnetic material is provided at the bottom of the inner hook of the horizontal hook to prevent the inner hook from moving due to a magnetic force of a magnet provided on the outer hook. A transparent part is provided in the part, and annular opaque parts are provided inside and outside the transparent part. Magnetic fine powder is applied to these opaque parts, and the lower thread bobbin is controlled by the suction force with the magnetic material at the bottom of the inner pot. A structure of a bobbin bobbin of a horizontal hook, which is characterized in that the opaque part gives a reference to an appropriate range of the bobbin thread remaining amount visually confirmed with respect to the transparent part while power is applied. 5. A horizontal bobbin of a sewing machine, wherein a magnetic material is provided on the bottom of the inner hook of the horizontal hook to prevent the inner hook from floating due to a magnetic force of a magnet provided on the outer hook. A transparent portion is provided in the portion, and annular opaque portions are provided inside and outside the transparent portion. Fine powder of a magnetic material is applied to these opaque portions, and the lower thread bobbin is attracted by the magnet of the outer pot. The structure of the bobbin bobbin of the horizontal shuttle, wherein the opaque portion provides a reference for an appropriate range of the bobbin thread remaining amount visually confirmed with respect to the transparent portion.