JPH0526517B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sewing device, and particularly to a sewing device that selects a desired needle thread, for example, a needle thread of a desired color, by changing the rotation of a needle bar during sewing. The present invention relates to sewing machines such as sewing machines and embroidery machines that enable sewing machines to perform sewing operations.

(Prior art) As a conventional technology for selecting a needle thread of a desired color during sewing, as shown in Japanese Patent Publication No. 45-23979, a plurality of needle bars are supported on a sewing machine support frame so as to be able to reciprocate up and down. Set a plurality of needle threads of different colors on the sewing machine in advance, thread these needle threads through the needle holes of the sewing machine needles attached to each needle bar, and then thread one of the needle bars during sewing. There is a technique in which the remaining needle bars are connected to the drive source of the needle bar and locked in a fixed vertical position.According to this technique, multiple needle bars and the drive source of the needle bar This requires a mechanism for selecting and switching the sewing machine, which poses a problem in that the sewing machine itself becomes larger and more complex.

(Problems to be Solved by the Invention) The problems to be solved by the present invention are when selecting a needle thread of a desired color during sewing with a sewing device.
To enable a needle thread of a desired color to be selected by switching the rotation of a single needle bar without making a device large or complicated.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a sewing machine needle having a plurality of needle holes formed at mutually shifted phases with respect to the longitudinal axis of the needle. Then, the sewing machine needle is attached and the needle thread is rotated in a direction in which one of a plurality of needle thread loops formed during sewing by the upper thread passed through the plurality of needle holes can be captured by the tip of the outer hook. By providing a sewing device equipped with a needle bar that can be used as a sewing machine, needle thread of a desired color can be selected by rotating a single needle bar without increasing the size or complexity of the device. It is something.

(Function) Since the sewing machine of the present invention is constructed as described above, a plurality of needle threads of different colors can be set in advance on the sewing machine and the needle threads can be set on the sewing machine needle without increasing the size or complexity of the device. If the needle thread is passed through a plurality of needle holes, the needle thread of a desired color can be selected and sewn by changing the rotation of the needle bar during sewing with the sewing machine.

(Example) The present invention will be described below with reference to Examples. The gist of the present invention is to provide a sewing machine needle having a plurality of needle holes that are formed out of phase with each other with respect to the longitudinal axis of the needle, and a sewing machine needle having a plurality of needle holes formed at different phases with respect to the longitudinal axis of the needle; The gist of the sewing device is a sewing device comprising a needle bar that can be rotated in a direction that allows the tip of an outer hook to catch one of a plurality of needle thread loops formed by a plurality of needle threads passed through the sewing machine. be.

In this embodiment, an example of a zigzag sewing machine will be described in which the needle has two holes, the amplitude of the needle bar support is controlled by rotation control around a vertical axis, and a horizontal hook is used. In FIG. 1, a needle bar mechanism 2 is incorporated into a sewing machine head 1.

The needle bar support 3 is rotatably supported by a shaft 4 fixed to a support frame, and the protrusion 3a is connected to the swing rod 5 via a pin 6 so that the needle bar support 3 can be controlled to rotate around the shaft 4. It's getting old. The shaft 4 is fixed to the horizontal hook 23 at a position concentric with the rotating shaft 25 of the outer hook 24.

The guide portions 3b and 3c of the needle bar support 3 include the needle bar 7.
is guided to be vertically movable and rotatable. A gear body 8 is rotatably attached to the upper part 3d of the needle bar support 3 via a cylindrical portion 8a, and a groove portion 8b of the gear body 8 has a groove portion 8b in the shape of a horizontal cross section of the needle bar 7. The joint portions 7a are engaged with each other so as to be able to move up and down with some clearance.

Reference numeral 9 denotes a needle bar holder, which allows the needle bar 7 to be reciprocated up and down via a needle bar crank rod 10 by a known needle bar mechanism.

The pin 11 driven into the needle bar 7 and the needle bar holder 9 engages with a pair of cam grooves 9a of the needle bar holder 9, and the rotation of the gear body 8 causes the needle bar 7 to move into the groove 8b.
The pin 11 is rotated via the engaging portion 7a and moves along the cam groove 9a, and the needle bar holder 9
The vertical position of the needle bar 7 relative to the needle bar 7 is movable. In this embodiment, in FIG. 3, when the gear body 8 is rotated approximately 90 degrees counterclockwise from the state shown in the figure, the needle bar 7 is rotated approximately 90 degrees, and the pin 11 is moved along the cam groove 9a. As shown in FIG. 4, the needle bar 7 is lowered by a distance L relative to the needle bar holder 9.

The gear 12 that engages with the gear portion 8c of the gear body 8 is
For reasons to be explained later, it has the same number of teeth as the gear part 8c, is rotatably supported on the shaft 4, and a gear 13 is engaged with the gear 12, which is rotated by a motor 14 attached to the support frame. It has become possible to control the movement. 14a is an output shaft of the motor 14.

The rotation phase of the gear 13 in FIG.
If expressed as a phase D connecting the axis of 4a and a point 26 for convenience, the gear 13 is rotationally controlled by the motor 14, rotated counterclockwise from the D phase in FIG. 3, and switched to the E phase. When the gear 13 is rotated, the gear 13 rotates the gear body 8 counterclockwise by 90° via the gear 12.

Although not shown, the gear 13 is adapted to be moderately locked to the support frame in the two rotation phases D and E described above.

Next, the sewing machine needle 15 attached near the lower end of the needle bar 7 will be explained. In FIG. 5, the sewing machine needle 15 has needle holes 1 near the lower end of the stem 16 that are out of phase with each other with respect to the longitudinal axis of the sewing machine needle 15.
7 and 18 are formed.

In FIG. 6, 19 is a long groove for the needle hole 17;
0 is a long groove for the needle hole 18, 21 is a hollow portion for the needle hole 17, and 22 is a hollow portion for the needle hole 18. If the directions of the needle holes 17 and 18 are shown as directions F and G (FIG. 6) passing through the centers of the needle holes 17 and 18 from the long grooves 19 and 20 side to the gouged portions 21 and 22 side, respectively, the directions F and G. The phases of the sewing machine needle 15 relative to the longitudinal axis thereof are shifted by 90° in this embodiment. Further, as shown in FIG. 5, the needle hole 17 and the needle hole 18 are positioned in the longitudinal direction of the sewing machine needle 15.
deviated by L′, relative to the longitudinal dimension l of the needle hole
L′>l, so that they do not intersect with each other. In this embodiment, the dimension L' and the dimension L described above are set to be equal.

However, the reason why the needle holes 17 and 18 do not intersect is a problem in terms of strength and processing of the needle, and is not necessarily an essential element. In this example, the case where the sewing machine needle has two holes is shown, but
It is also possible to have three or more needle holes.

(Function) Since the sewing device of the present invention is constructed as described above, the sewing machine needle 15 is attached to the needle bar 7 of the sewing machine 1, upper threads of different colors are set in the sewing machine 1 in advance, and a plurality of needles are attached. If the holes 17 and 18 are passed through the holes 17 and 18, the sewing machine can be stopped during sewing and the rotation of the gear 13 can be changed under the control of the motor 14.
is rotated with a slight vertical movement (dimension L), and only the desired needle thread loop is attached to the tip 24 of the outer hook 24.
Since the direction is switched to the direction captured by a (FIG. 6), it becomes possible to sew with the needle thread of a desired color.

That is, in the above, a red needle thread is passed through the needle hole 17 and a green needle thread is passed through the needle hole 18, and the gear 13 is set to rotational phase D by the motor 14 to perform sewing, and the needle thread is formed on the hollowed out portion 21 side. When the red needle thread loop 27 is captured by the tip 24a, the motor 14 switches the gear 13 to the rotation phase E, so that the needle hole 18 is moved approximately counterclockwise in FIG. As the needle bar 7 is rotated 90 degrees, the needle bar 7 is lowered relative to the needle bar holder 9 by an amount L' equal to the dimension L (Fig. 5), and the green needle thread loop 28 formed on the gouge portion 22 side is placed first. The needle thread loop 28 is formed at the same position as the red needle thread loop 27, and when the needle drops in the same amplitude direction, the needle and the tip intersect in the same relationship, and the green needle thread loop 28 is captured by the tip 24a, and the green needle thread loop 28 is Can be sewn with thread.

In each of these switching phases, the gear 13 is latched to the supporting frame with moderation, and the gear 1 that engages with it is
2 is also locked so that it does not rotate. Therefore,
The gear body 8 is rotated by a small angle by the swing control for amplitude control of the needle bar support 3, but the numbers of teeth of the gear body 8 and the gear 12 are equal as described above, and the needle bar 7
is rotated by an angle equal to the swing angle of the needle bar 7 with respect to the shaft 4. Therefore, if one phase of the needle holes 17 and 18 is made to pass through the axis of the shaft 4 at an arbitrary amplitude phase of the needle bar 7, that is, since the shaft 4 is concentric with the rotating shaft 25 of the outer hook 24, Needle hole 1 at any needle drop position
One phase of 7 and 18 is the motion trajectory H of the tip 24a.
If the rotationally selected needle holes are adjusted so that they are perpendicular to the movement locus H of the tip 24a of the outer hook 24, the phase of each needle hole is always perpendicular to the motion trajectory H of the tip 24a of the outer hook 24 throughout the amplitude control range of the needle. , can perform good sewing.

In the above explanation, the selected needle threads were explained using examples of needle threads of different colors, but it is clear that the method can also be applied to needle threads of different materials, counts, or combinations thereof. .

(Effects) As described above, according to the present invention, a plurality of needle threads of different colors can be set in advance in a sewing machine and passed through a plurality of needle holes of a sewing machine needle without increasing the size or complexity of the device. By doing so, it is possible to easily select a desired upper thread, for example, a desired upper color, during sewing with a sewing machine by switching the rotation of the needle bar.

[Brief explanation of the drawing]

The drawings relate to embodiments of the present invention, and FIG. 1 is a diagram showing the main parts of the sewing machine seen from the face plate side, FIG. 2 is a cross-sectional view of the main parts taken along the line A-A in FIG. B in Figure 1
4 is an enlarged view of the main part of the needle bar holding part in FIG. 2; FIG. 5 is a perspective view of the sewing machine needle;
6 is a sectional view taken along the line CC in FIG. 5, and FIG. 7 is a view showing a plurality of needle thread loops formed on the needle in the same cross section as FIG. 6. 1 is a sewing machine, 7 is a needle bar, 15 is a sewing machine needle, 17 and 18 are needle holes, 24 is an outer hook, and 24a is a tip.

Claims (1)

[Claims] 1. A sewing machine needle having a plurality of needle holes formed out of phase with each other with respect to the longitudinal axis of the needle;
A needle to which the sewing machine needle is attached and which can be rotated in a direction in which one of a plurality of needle thread loops formed during sewing by the needle thread passed through the plurality of needle holes can be captured by the tip of the outer hook. A sewing device comprising: a rod.