JPH0698985A - Driving structure for needlebar of sewing machine - Google Patents

Abstract

PURPOSE:To provide the driving structure for needledar capable of simply performing various sewing working by separately driving a needledar simplifying assembly and correction, and securing enough strength of the needledar. CONSTITUTION:The structure is provided with a driving body 20 making a reciprocating motion for the sewing machine and plural needlebars 30 slidably supported by the sewing machine. The driving structure of the needledar of the sewing machine separately driving plural needledar 30 by separately connecting the driving body 20 and each needledar 30 is provided with an engagement member 31 integrated in each needledar 30, a rotating member 21 provided on the driving body 20 and engaged with each engagement member 31 through rotation, and a rotation means 4 rotating each rotating member 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for driving a needle bar in a sewing machine, and more specifically, to a driving body that reciprocates with respect to the sewing machine body, and a plurality of needle bars slidably supported by the sewing machine body. The present invention relates to an improvement of a needle bar drive structure in a sewing machine configured to individually drive a drive body and each needle bar to individually drive each needle bar.

[0002]

2. Description of the Related Art There are various sewing machines for sewing, some of which are, for example, quilting machines.
Some have multiple needle bars. Generally, in such a sewing machine, as shown in FIG. 5, a plurality of needle bars are attached to a reciprocating driving body, and a plurality of similar sewing processes are simultaneously performed by the respective needle bars.

By the way, in a sewing machine having a plurality of needle bars, the needle bar must be properly attached to and detached from a desired position of the driving body in accordance with the contents of the sewing work. It required very complicated work.
A variety of sewing processes that do not require such needle bar attachment / detachment work are disclosed in, for example, Japanese Patent Publication No. 53-44854 or Japanese Patent Publication No. 60-36500. There is such a needle bar drive structure. As shown in FIG. 6 or FIG. 7, this is provided with a driving body that reciprocates with respect to the sewing machine main body and a plurality of needle bars slidably supported by the sewing machine main body. Each needle bar is individually driven by individually connecting each needle bar.

[0004]

However, in the conventional needle bar driving structure as described above, as shown in FIG. 6 or FIG.
As shown in Fig. 3, the needle bar itself has a structure in which pins and the like for individually connecting the driving body and each needle bar are provided. Replacing individual needle bars due to wear or damage was also very complicated. Here, in a sewing machine, generally, the drive portion and the main body itself are sufficiently rigidly formed and they are hardly damaged, but the needle bar is formed finely and moves relatively at high speed. It is easily damaged. In addition, assuming that the sewing machine may be damaged for some reason, in order to minimize the damage and allow it to be restored with a minimum of repairs, first make sure that the needle bar is In some cases, the needle bar is easily damaged and the so-called mechanical fuse is used as the needle bar. Therefore, the work of exchanging the needle bar must be simplified as much as possible.

Further, in the conventional needle bar drive structure,
It is necessary to provide an insertion hole for inserting the pin in the needle bar itself,
The strength of the needle bar itself is significantly deteriorated. For this reason, it is necessary to increase the size of the needle bar itself or to secure the strength of the needle bar by forming the needle bar itself from an expensive material having high strength. However, increasing the size of the needle bar itself increases the weight and makes it impossible to support high-speed operation.
If an expensive material is used, the cost reduction becomes difficult, and other problems occur. Further, since the shapes of individual parts such as the needle bar, the pin, and the lever for driving the pin are minute and complicated, a great deal of labor is required to process the individual parts.

The present invention has been made in order to solve such a problem, and an object of the present invention is to simply drive a needle bar individually and easily perform a wide variety of sewing processes. Another object of the present invention is to provide a needle bar drive structure in a sewing machine, which can simplify operations such as assembling and repair, and which can sufficiently secure the strength of the needle bar, by a simple structure.

[0007]

The means adopted by the present invention for solving the above problems will be described with reference to the reference numerals used in the drawings. "The driving body 20 reciprocating with respect to the sewing machine main body 10 will be described. And a plurality of needle bars 30 slidably supported by the sewing machine main body 10, and the needle bars 30 are individually driven by connecting the driver 20 and the needle bars 30 individually. In the drive structure of the needle bar 30 in the sewing machine configured as described above, the engaging member 31 integrated with each needle bar 30 is provided.
And a pair of rotating members 21, which are provided on the driving body 20 and engage with the engaging members 31 by rotating, and a rotating means 40 for rotating each rotating member 21. And a drive structure for the needle bar 30 in the sewing machine ”.

[0008]

The driving structure of the needle bar 30 in the sewing machine of the present invention constructed as described above works as follows.

First, each needle bar 30 is individually driven by being connected to the driving body 20 individually. Therefore, the sewing machine adopting such a drive structure of the needle bar 30 does not require the work of properly attaching and detaching the needle bar 30 to and from the drive body 20 according to the sewing work content, and the needle bar 30 and the drive body 20 A wide variety of sewing processes can be easily performed by simply changing the connection state individually.

By the way, in order to drive each needle bar 30 individually, each needle bar 30 and the driving body 20 are individually connected. This connection is made by the rotating member 2 provided on the driving body 20.
This is performed by rotating 1 and engaging the rotating member 21 and the engaging member 31 integrated with the needle bar 30. Therefore, the engagement member 31 may be integrated with the needle bar 30 in order to connect the driving body 20 and the needle bar 30, and the assembly and replacement of the needle bar 30 are much simpler than in the conventional case. To be done.

Further, as the rotating member 21 rotates, it engages with the engaging member 31 of the needle bar 30 and the needle bar 30 and the driver 2.
Since 0 and 0 are connected, there is no need for a pin or a lever for operating the pin as in the conventional case, and the structure is very compact and simple. Moreover, it is not necessary to provide a pin insertion hole in the needle bar 30 itself as in the conventional case, and the needle bar 30 is assured of strength and reliability.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the drive structure of the needle bar 30 in the sewing machine of the present invention will be described in detail with reference to the drawings. In addition, in the present embodiment, a plurality of needle bars 3 are used as the sewing machine.
Although an example is shown in which a so-called quilting machine having 0 is mainly used for performing quilting processing is shown, the drive structure of the needle bar 30 of the present invention is not limited to this, and for example, a plurality of needle bars 30 are provided. It is widely used in sewing machines having a plurality of needle bars 30, such as an embroidery machine.

As shown in FIGS. 1 and 2, the sewing machine main body 1
0 is a large number of columns in the horizontal direction (direction of arrow X in FIG. 1),
A large number of needle bars 30 in two rows are individually slidably supported in the vertical direction (direction of arrow Y in FIG. 2). An engaging member 31 is integrated with each needle bar 30 by a set screw 32, and one end of the engaging member 31 slides in the guide groove 11 of the sewing machine main body 10. Each needle bar 3
0 is biased upward by the spring 33, and the engaging member 3
When 1 is not engaged with the rotating member 21, the engaging member 31 always ensures a predetermined position. The predetermined position is the driving body 20 that reciprocates up and down.
When the rotating member 21 is rotated while the position is at the top dead center, the engaging member 31 and the rotating member 21 are engaged with each other.

On the other hand, the driver 20 is composed of the needle bars 3 arranged in two rows in the vertical direction.
The needle bar 30 of the driving body 20 is provided at the approximate center of 0.
A needle bar 30 and a pair of rotating members 21 are provided in a portion facing each other. Here, as shown in FIGS. 3 and 4, the rotating member 21 includes a passage groove 23 through which the engaging member 21 of the needle bar 30 can pass, and an engaging groove 24 that engages with the engaging member 21. Is formed, and the engaging groove 24 of the rotating member 21 is fitted to the convex portion 25 formed on the driving body 20 in a state where the rotating member 21 is rotatable with respect to the driving body 20. . Also, the rotating member 21
A rotary shaft 22 having a quadrangular cross section is slidably inserted through the rotary shaft 21, and the rotary member 21 is reliably rotated by rotating the rotary shaft 22.

By rotating the rotating member 21 and engaging the rotating member 21 of the driving body 20 and the engaging member 31 of the needle bar 30, the driving body 20 and the needle bar 30 are connected. However, when the unconnected state is formed, as shown in FIG. 3, if the rotating member 21 is rotated to a position where the passage groove 23 of the rotating member 21 faces the engaging member 31, Even if the driving body 20 reciprocates, the engaging member 31 of the needle bar 30 will pass through the passage groove 23 of the rotating member 21.
0 and the needle bar 30 are not connected, and the movement of the driving body 20 is the needle bar 3
Not transmitted to 0.

Further, in the case where the driving body 20 and the needle bar 30 are connected to each other from the unconnected state, as shown in FIG. 4, the driving body 20 is rotated when it is at the top dead center position. When the member 21 is rotated, the engaging member 31 of the needle bar 30 is engaged with the engaging groove 24 of the rotating member 21 and the driver 20 and the needle bar 3 are engaged.
0 is connected, and the motion of the driving body 20 is transmitted to the needle bar 30. In this embodiment, the engaging member 31 and the engaging groove 24 of the rotating member 21 are provided with notches 34 and 26, respectively, so that the engaging member 31 and the rotating member 21 can be smoothly engaged with each other. It's done.

By the way, the rotating member 2 is provided through the rotating shaft 22.
As the rotating means 40 for rotating 1 there may be adopted a one-acting air cylinder, and one direction may be urged by a spring or the like and the other direction may be operated by air pressure, but in the present embodiment, An air cylinder that operates in both directions is adopted, and the rotating shaft 22 is forcibly rotated in both forward and reverse directions by air pressure. By doing so, it is possible to prevent erroneous operation due to deterioration of the spring or the like due to long-term use, and to ensure reliable operation. Further, the rotating means 40 is not limited to an air cylinder, but various actuators such as a hydraulic cylinder and a solenoid, or a motor may be used. By the rotating means 40 as described above, the rotating member 21
By rotating, the rotation of each rotating member 21 can be appropriately controlled from the outside by, for example, electrical control, that is, the drive of each needle bar can be appropriately controlled from the outside, and a more complicated sewing process can be performed. Can correspond to.

[0018]

As described above in detail, in the needle bar drive structure of the sewing machine of the present invention, the rotating member of the driving member is rotated to engage the engaging member of the needle bar. In addition, the driving body and the needle bar are connected to each other so that the motion of the driving body is transmitted to the needle bar, which has a very simplified structure compared to the conventional one. Moreover, unlike the prior art, it is not necessary to provide a pin for connecting the drive to the needle bar or to form an insertion hole for this pin, and the needle bar has a simple structure in which an engaging member is integrated.

Therefore, according to the present invention, not only the needle bars can be individually driven to perform a wide variety of sewing processes, but also the assembly and repair work can be simplified, and A needle bar drive structure in a sewing machine that can sufficiently secure the strength of the needle bar can be provided by a simple structure.

[Brief description of drawings]

FIG. 1 is a partial front view showing an embodiment of a needle bar drive structure in a sewing machine according to the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a partial perspective view showing a state in which a rotating member and an engaging member are not engaged with each other.

FIG. 4 is a partial perspective view showing a state in which a rotating member and an engaging member are engaged with each other.

FIG. 5 is a partial perspective view showing a drive structure of a needle bar in a conventional sewing machine.

FIG. 6 is a partial sectional side view showing a drive structure of a needle bar in a conventional sewing machine.

FIG. 7 is a partial cross-sectional side view showing a drive structure of a needle bar in a conventional sewing machine.

[Explanation of symbols]

 10 sewing machine main body 11 guide groove 20 driving body 21 rotating member 22 rotating shaft 23 passing groove 24 engaging groove 25 convex portion 26 notch 30 needle bar 31 engaging member 32 set screw 33 spring 34 notch 40 air cylinder

Claims (1)

[Claims] 1. A driving body which reciprocates with respect to a sewing machine main body, and a plurality of needle bars slidably supported on the sewing machine main body, wherein the driving body and each needle bar are individually connected. In the needle bar driving structure of the sewing machine configured to individually drive each needle bar by the above, an engaging member integrated with each needle bar and a driving body are provided,
A needle bar in a sewing machine, comprising: each engaging member that engages with each engaging member by rotating, a pair of rotating members, and rotating means that rotates each rotating member. Drive structure.