JPH04170993A - Sewing machine - Google Patents

Abstract

PURPOSE:To improve working efficiency by performing the exchange of needle thread smoothly and shortening the exchange time of color thread by unifying at least a needle bar, a thread take-up lever, and a needle thread supply source, and setting them loadably/unloadably on a sewing machine main body. CONSTITUTION:A needle bar unit 19 is formed integrally by loading the needle bar 25, the thread take-up lever 17, and a needle thread bobbin 47 and making them into a unit, and is set loadably/unloadably on a needle bar unit holding body 11. A cam 32 is fixed on an upper shaft 4, and a cam follower 35 to be fitted in a cam groove 34 is mounted at the tip of a connection bar 33 mounted integrally with a thread take-up lever driving bar 15. The tip of the thread take-up lever driving bar 15 is engaged with the thread take-up lever 17, therefore, the thread take-up lever driving bar 15 is rocked according to the rotation of the upper shaft 4 via the connection bar 33, and the thread take-up lever 17 engaged selectively with the thread take-up lever driving bar 15 is rocked upward/downward.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sewing machine, and particularly to a sewing machine such as an embroidery machine in which upper thread is frequently replaced.

[Prior art] Conventionally, when using an embroidery machine to embroidery a pattern using various colored threads as the upper thread, after finishing the embroidery process with one colored thread, the thread was removed from the needle and then re-embroidered. Since different colored threads are inserted into the needle for the next process, when embroidering patterns with multiple colors, it takes time and effort to repeat the process of changing colored threads, which reduces manufacturing efficiency and increases costs. This process is the same when embroidery threads such as cotton thread, human silk thread, Tetoron thread, etc. are alternately used for embroidery. Next, as a device that is more advanced than the above, multiple horizontal shafts are connected to one set of needle bars and thread take-up, and a different color thread is set for each set of thread take-up and needle bars. There is a device in which when any one of the shafts is selected and started using an electric device, the related thread take-up and needle bar move up and down to form a stitch, but in this device, There is a limit to the number of horizontal shafts installed (usually three), and although it is possible to improve efficiency slightly compared to replacing colored threads each time, the number of colors is still small. As a further advancement,
As disclosed in Japanese Patent Publication No. 53-43336, a plurality of needle bars are housed in parallel in a needle bar case, and the needle bar case is moved horizontally to a predetermined distance together with a needle bar case slide rod. When the drive ball protrusion of a predetermined needle bar is fitted into the concave part of the needle bar drive rod and the needle bar drive lever is then operated, the needle bar also moves in synchronization with the vertical movement. , there is a device that performs embroidery using this method, which can improve efficiency compared to the above devices.

[Problem to be solved by the invention] However, even in the above device, the number of colored threads is the same as the number of needle bars in the needle bar case, and although it is fine while embroidering the same pattern, it is difficult to embroider different patterns. It is rare that a new pattern can be embroidered with the colored threads currently available on each needle, and in the case of embroidery, remove the unnecessary colored threads from the multiple needles and add the necessary colored threads to the needles. Since the sewing machine had to be stopped during this troublesome threading process, efficiency was extremely low, especially when different patterns were being embroidered frequently.

The present invention was made to solve the above-mentioned problems, and it is possible to easily and smoothly change the upper thread during work, and it is possible to change the colored thread when changing from one pattern to a different pattern. To provide a sewing machine capable of shortening time and greatly increasing work efficiency.

[Means for Solving the Problems] In order to achieve this object, the sewing machine of the present invention is such that at least a needle bar, a thread take-up bar, and an upper thread supply source are integrated and are detachable from the sewing machine body.

[Function] The sewing machine of the present invention having the above-mentioned configuration has at least the needle bar, the thread take-up bar, and the needle thread supply source integrated into one body, and is removable from the sewing machine body.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

In the figure, a guide rod 2 is provided that is fixed vertically within a machine frame 1 of the sewing machine.

A drive piece 3 is fitted into the guide rod 2, and is moved up and down by a predetermined amount by the swinging motion of a crank mechanism 5 linked to the upper shaft 4 of the sewing machine.

A bifurcated fork 6 opening in the horizontal direction is formed on the front side (left side in FIG. 1) of the drive piece 3.

The fixed support frame 7 is fixed to the front surface of the machine frame 1, and has a cutout groove 8 formed in the vertical direction in the center thereof.
A fork 6 of the drive piece 3 protrudes from the drive piece 3.

A fixed rail 9 is fixed horizontally to the upper part of the fixed support frame 7, and a rotating roller 10 is disposed horizontally in front of the machine frame 1.

A movable rail 12 horizontally fixed to the upper part of the needle bar unit holder 11 is attached to the fixed rail 9 via slide rollers 13, and a movable rail 14 fixed horizontally to the lower part is attached to the rotary roller. 10 is installed. That is, the needle bar unit holder 11 is installed so as to be movable from side to side with respect to the front side of the machine frame 1. A cutout groove 16 for a thread take-up drive rod 15 is formed on the rear side of the further upper part of the moving rail 12 of the needle bar unit holder 11, so that the movement of the needle bar unit holder 11 and the thread take-up drive rod are prevented. 15 vertical swings are possible. Further, on the front side of the needle bar unit holder 11, a notch groove 18 is formed in the vertical direction for swinging the balance rod 17. Furthermore, a needle bar unit 19 is provided on the upper part of the needle bar unit holder 11.
There is a holding member 21 that holds the engaging claw 20 of the needle bar unit 19 in order to hold the needle bar unit 19. A lever 22 is fixed to the holding member 21, and is normally biased counterclockwise by a spring (not shown).

Holding holes 23 that also serve for positioning are formed at the top and bottom of the needle bar unit holder 11, and when the holding protrusions 24 of the needle bar units 19 fit into the holding holes 23, the plurality of needle bar units 19 can be held by the needle bar unit holder 11.

The needle bar unit 19 is provided with a needle bar 25 that is vertically supported so as to be movable up and down.
6 is installed.

An engaging piece 27 is fitted into the needle bar 25 and fixed with a screw (not shown), and is selectively engaged with the fork 6 to move the needle bar 25 up and down.

Further, a cloth presser 28 is attached to the needle bar 26, and is biased downward by a spring 29 interposed between its upper end and the engaging piece 27.

A notched groove 30 is provided in the front face of the needle bar unit 19, and the thread take-up rod 17, which is rotatably supported by a pin 31, is formed to be able to swing vertically.

The thread tension of the upper thread 45 is performed by a tension disc 36, and the tension of the upper thread 45 is
7 and is energized by turning the adjustment knob 38.

The upper thread 45 is connected to the guide 39.40.41.42.43.
．． 44, and the guide 44 can be expanded and contracted in the horizontal direction by a slide mechanism (not shown).

The guide rod unit 19 is provided with a thread stand 46, which is horizontally extendable and retractable by a slide mechanism (not shown), and an upper thread bobbin 47 is disposed upright on its upper surface.

As in the above configuration, the needle bar unit 19 has the needle bar 25, the thread take-up bar 17, and the needle thread bobbin 47 attached thereto, is integrated into a unit, and is removable from the needle bar unit holder 11. It becomes.

A cam 32 is fixed to the upper shaft 4, and a cam 32 is fixed to the upper shaft 4.
A cam follower 35 that fits into a cam groove 34 is attached to the tip of a connecting rod 33 that is integrally attached to the cam follower 35 . The tip of the balance driving rod 15 selectively engages with the balance rod 17, so that as the upper shaft 4 rotates,
The balance drive rod 15 is oscillated via the connection rod 33, and the balance rod 17 selectively engaged with the balance drive rod 15 is oscillated in the vertical direction.

Next, the operation when replacing the needle bar unit will be explained.

Manually rotate the lever 22 of the needle bar holding unit 11 clockwise (in FIG. 1). As a result, the holding member 21
The engaging pawl 20 of the needle bar unit 19 comes off, and the needle bar unit 19 is held by the holding protrusion 24 and becomes free in the front direction. In this state, remove the needle bar unit 19 with the unnecessary needle thread 45 attached by pulling it out in the front direction. Then, when the needle bar unit 19 with the required needle thread 45 is attached to the needle bar unit holder 11 and the lever 22 is released, the lever 22 and the holding member 22 are moved counterclockwise (
1), and the engaging claw 20 is rotated to the right (first
(in the figure) to securely hold the needle bar unit 19.

At the time of installation, adjacent upper thread bobbins 47 are placed in different positions as shown in FIG. 3 so that they do not come into contact with each other.

Also, when the needle bar unit holder 11 moves left and right, the upper shaft 4 is controlled so that the drive piece 3 fitted into the guide rod 2 is positioned at the top dead center, and the sewing machine stops. be done. The engagement piece 27 of the needle bar unit 19 supported by the needle bar unit holder 11 in this position and the balance bar 17
are all arranged vertically at the same height, and each engaging part has a horizontal blade.

It is possible to move in the direction without any problem. In this state, a mechanism (not shown) selectively horizontally moves the needle bar holding unit holding frame 11 by a predetermined amount, and the newly selected needle bar 25 and the balance bar 17 can be driven.

In this embodiment, either a generally used large-sized needle thread bobbin is provided, or a specialized needle thread bobbin is used as shown in FIGS. The unit can be made simple and easy to handle. To explain briefly, FIG. 4 is a sectional view seen from the front side, and FIG. 5 is a diagram showing a state in which the side cover is removed by a mechanism not shown.

The upper thread bobbin 46 is wound with thread in the same manner as a general lower thread bobbin, and then attached to the needle bar unit. By storing the needle thread bobbin 46, tension plate 35, and needle thread 44 in the needle bar unit in this way, the appearance of the needle bar unit becomes simple and the needle bar unit is easy to store and handle when being attached or detached.

In addition, this embodiment is an example of a so-called multi-needle sewing machine that has a large number of needles for one head, or the same effect can be obtained even with a single-needle sewing machine such as a general home sewing machine. .

[Effects of the Invention] As is clear from the detailed description above, according to the sewing machine of the present invention, the needle thread can be changed easily and smoothly during work, and when changing from one pattern to a different pattern. The time required to change colored threads can be shortened, and work efficiency can be greatly increased.

[Brief explanation of the drawing]

1 to 5 show embodiments embodying the present invention, in which FIG. 1 is a side view of the sewing machine, FIG. 2 is a front view of the sewing machine, and FIG. 3 is a thread bobbin section. A view from above,
4 and 5 show the second embodiment, FIG. 4 is a sectional view of the needle bar unit as seen from the front side, and FIG. 5 is a side view of the needle bar unit with the side cover removed. It is a figure showing a state. In the figure, 11 is a needle bar unit holder, 17 is a balance bar, and 19
26 is a needle bar unit, 26 is a needle bar, and 46 is an upper thread bobbin. Cow 311 IF5 palanquin IS diagram

Claims (1)

[Scope of Claims] 1. A sewing machine equipped with a stitch forming means for vertically moving a needle bar and a thread take-up rod that are interlocked with a sewing machine drive unit, and a needle thread supply source that supplies needle thread for forming stitches, A sewing machine characterized in that at least the needle bar, the thread take-up bar, and the needle thread supply source are integrated into a unit and can be attached to and detached from the sewing machine main body. 2. The sewing machine according to claim 1, wherein the needle bar unit holder for holding the plurality of needle bar units is movable left and right with respect to the machine frame of the sewing machine.