JPH03193090A - Sewing machine for embroidery - Google Patents

Abstract

PURPOSE:To easily control displacement in X-and Y-axial directions and the rotation of an embroidery frame and the amplitude of a needle with high accu racy by applying numerical control by providing X and Y axis driving means which displaces the embroidery frame on a theta axis driving means rotating concen trically with the neutral point of a needle in two directions intersecting orthogonally with each other on the same flat plane. CONSTITUTION:The embroidery frame 5 is comprised so that it can be displaced rotatably with the theta axis driving means 2 always rotating concentrically with the neutral point C of the needle, and can also be displaced in the X- and Y- axial directions with the X-axis driving means 3 and the Y-axis driving means 4 rotating integrally with the theta axis driving means 2. Therefore, it is possible to easily set control variables for the increment of angle of rotation, the incre ment in X- and Y-axial directions, and the rocking amplitude increment of the needle, etc., inspite of another control variables. Therefore, the length and the width, etc., of an embroidered pattern can be easily changed. Also, embroi dery can be applied at an arbitrary position on cloth held at the embroidery frame.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an embroidery sewing machine, and more particularly, to an embroidery frame that applies a predetermined amplitude stitch to an embroidery needle using an amplitude drive means and holds the fabric to be embroidered under tension. The machine is rotated and moved in the X and Y directions using a rotating/moving means to automatically embroidery mainly in a zigzag pattern.

BACKGROUND OF THE INVENTION Conventionally, zigzag embroidery sewing machines have been provided, for example, of the type disclosed in Japanese Patent Application Laid-Open No. 63-203188. In this type of embroidery machine,
In the area below the needle, which performs an amplitude movement as well as an up-and-down reciprocating movement,
A mechanism such as a motor is provided to displace the fabric in two orthogonal directions (X-axis direction and Y-axis direction) within the same plane perpendicular to the embroidery, and the fabric to be embroidered is placed under tension on the mechanism. The embroidery frame includes an embroidery frame to be held and a means for rotating the embroidery frame by means such as a motor. Further, the displacement in the two directions and the rotation of the embroidery frame are detected by means such as encoders, and the detected movement values are stored in a floppy disk or the like.

The above-mentioned embroidery sewing machine is modeled after an embroidery work in which an expert performs a desired embroidery design only once using a zigzag sewing machine. That is, an expert holds the embroidery frame in his hand and moves it in the X- and Y-axis directions while rotating it, so that the desired point of the fabric held under tension in the embroidery frame is located vertically below the embroidery needle. An embroidery pattern is created while moving the embroidery frame, and the movement of the embroidery frame at that time, that is, the displacement and rotation in the X-axis and Y-axis directions, is detected and stored. Then, based on this stored data, the X-axis and Y-axis displacement means and the embroidery hoop rotation means are controlled and operated to reproduce the embroidery work that the expert had just performed. ' method has been adopted.

Problem to be Solved by the Invention However, the above-mentioned type of embroidery sewing machine has a structure in which a means for displacing the embroidery frame in the X-axis direction and the Y-axis direction and a means for rotating the embroidery frame are provided. The positional relationship between the center and the needle constantly changes due to displacement in the X-axis direction and the Y-axis direction. Therefore, the position accuracy during reproduction is affected by the setting accuracy of the initial position of the stab, the X-axis direction, the Y-axis direction of the frame, and the rotation, and if the initial position is even slightly different from the set position, the reproduction accuracy will be affected. It has drawbacks that are not only inferior, but also impossible to reproduce depending on the degree. Furthermore, the embroidery machine described above requires complicated means for numerical control.

The purpose of the present invention is to solve the problems of conventional embroidery machines described in 1., and to easily and precisely control the displacement in the X-axis and Y-axis directions, the rotation of the embroidery frame, and the amplitude of the needle by numerical control. The object of the present invention is to provide an embroidery sewing machine that can carry out embroidery.

Means for Solving the Problems Accordingly, the present invention provides an amplitude sewing drive means that oscillates at a given amplitude around the neutral point of a needle that reciprocates up and down (the central axis of the needle when it is stopped), and an embroidery sewing machine. X-axis and Y-axis drive means for displacing an embroidery frame that holds the target fabric under tension in mutually orthogonal directions within the same plane orthogonal to the neutral point of the needle; a θ-axis drive means for rotating an embroidery frame, the X-axis drive means and the Y-axis drive means are arranged so as to be rotated together with the embroidery frame by the θ-axis drive means, and the θ-axis drive means The embroidery frame, which is rotationally driven around the neutral point of the needle, is moved independently in the X-axis direction and the Y-axis direction using an X-axis drive means and a Y-axis drive means. Increment of displacement in Y-axis direction,
To provide an embroidery sewing machine characterized in that it is configured to be able to create an embroidery pattern by controlling the increment of the rotation angle and the increment of the amplitude of the oscillation of the needle independently of each other. be.

Specifically, the θ-axis drive means includes an annular plate having a large gear carved on its outer periphery, a driving small gear that engages with the large gear and transmits the rotation of the motor to the annular plate, and an annular plate. It consists of a guide roller that keeps the center of rotation of the needle always concentric with the neutral point of the needle. Further, the X-axis driving means and the Y-axis driving means supported on the annular plate each include a long pinion whose rotation is transmitted from a motor by a gear mechanism, and a hollow portion of the annular plate that is engaged with the long pinion. It consists of supporting members F and lj that protrude from the embroidery frame and have a lance at one end that connects to the embroidery frame.

The X-axis drive means, the Y-axis drive means, the θ-axis drive means, and the amplitude sewing drive means described in 1. are numerically controlled by a pattern information reading device, a storage device, an arithmetic device, a pulse generator, a pulse conversion device, etc. It has become so.

In the single-sided embroidery machine according to the present invention, as described in -,
A θ-axis drive means that rotates concentrically with respect to the neutral point of the needle." Second, an X-axis drive means and an
Increments in displacement in the X-axis and Y-axis directions, increments in rotation angle, and
It can be easily controlled using the four control variables of the amplitude increment, and so-called zigzag patterns can be created with high accuracy and a simple control mechanism.

winter-seeking customs Next, the present invention will be explained in detail based on examples.

As shown in FIGS. 1 to 5, the stab l according to the present invention
i Use sewing machine l (J, Stitch 11. Rotate frame 5 θ
Axial drive means 2, X-axis drive means 3 that moves linearly in the X-axis direction
, an X-axis drive means 4 that moves in the Y-axis direction, and further,
A sewing machine drive motor 13 (not shown in FIGS. 1 to 4) that reciprocates the needle 15 in vertical and vertical directions, and a steering wheel for amplitude sewing that gives the needle 15 a zigzag amplitude around its neutral point C. A pink motor 14 (hereinafter abbreviated as amplitude sewing drive motor) is built into the sewing machine arm 12.

The θ-axis drive means 2 includes a ring plate 2t on which the X-axis drive means 3 and the X-axis drive means 4 are mounted, a pedestal 22 attached below the bed 11 of the sewing machine Three guide rollers 23 and a driving small gear 24 are mounted on a pedestal 22 that concentrically supports and guides the (omitted).

The annular plate 2+ has an appropriate thickness, has an X-axis drive means 3 and an X-axis drive means 4 mounted on its upper surface, and holds the fabric to be embroidered in a tensioned state inside the hollow part 2]a. The embroidery frame 5 is moved by the X-axis and the X-axis driving means 3.
Supported through 4. It should be noted that the hollow portion 2+afl is simply a space provided so as not to obstruct the movement of the stab I+1 frame 5.

A large gear 21b is carved on the outer periphery of the annular plate 21, and meshes with the small drive gear 24.

The guide roller 23 consists of a cylindrical portion 23a that comes into contact with the outer periphery of the annular plate 21, and a thin edge 23b on which a part of the annular plate 1- is placed, and is rotatably fixed to the base 22''-. There is. The drive small gear 24 engages with the large gear 21b of the annular plate 2I, and, like the guide roller 23, has a thin edge 24 on which the annular plate 2 is held horizontally. a, and transmits the rotation of the θ-axis drive motor 25 provided on the pedestal 22 to the annular plate 21.

When the annular plate 21 is arranged, the guide roller 23 and the driving small gear 24 are connected to the annular plate 2! The ring plate 21 is arranged to rotate, stop, and hold the annular plate 21 in such a manner that the center of rotation of the needle 15 is always kept concentric with the neutral point C of the needle 15.

The X-axis drive means 3 includes a pair of long pinions 3I and an X-direction rack 32, which are arranged parallel to each other at opposite positions across the center of the annular plate 21, and one end of the X-direction rack 32 is connected to an annular ring. The plate 21 is connected to the outer frame 5I of the embroidery frame 5 at the hollow portion 21a. By using this coupling mechanism, the X-direction rack 32 is moved linearly in the X-direction by the rotational drive of the long pinion 31, and the embroidery frame 5 is linearly moved in the I try not to prevent it from moving in any direction.

Further, each long pinion 31 is connected to a shaft 36 to which the rotation of an X-axis drive stepping motor 35 (hereinafter abbreviated as X-axis drive motor) is transmitted via spur gears 33 and 34.
Rotation is transmitted from both ends of the shaft through bevel gears 37 and 38. That is, the rotation of the X-axis drive motor 35 is transmitted to the long pinion 31 via the shaft 36, and slides on the bottom surface of the X-direction rack 32 or the annular plate 21, causing the frame 5 to move in the X-axis direction. It is designed to be displaced linearly. In addition, in the meshing between the long pinion 31 and the X-direction rack 32, there is stabbing, which will be described later.

In accordance with the movement of the frame 5 in the Y-axis direction, the X-direction rack 32 is movable in the Y-axis direction along the axis of the long pinion 31.

The Y-axis drive means 4 includes a long pinion 41 arranged on the annular plate 21 in a direction orthogonal to the long pinion 31 of the X-axis drive means 3, and a Y-axis drive stepping motor 42 (hereinafter referred to as Y-axis It is equipped with a drive motor (abbreviated as a drive motor). Similarly to the pinion 31 of the X-axis drive means 3, the long pinion 41 engages with a rack 45 made of a rectangular plate that has rank teeth on two sides and is slidable in the Y-axis direction. ing. The rack 45 is connected to the embroidery frame 5 at one end thereof. The rotation of the Y-axis drive motor 42 is transmitted to the long pinion 41 via spur gears 43 and 44, and the rotation of the long pinion 4I causes the rack 45 to move linearly in the Y-axis direction, thereby moving the embroidery frame 5. It is designed to give displacement in the Y-axis direction. The rack 45 is movable in the X-axis direction along the axis of the 1-ink pinion 41 in accordance with the movement of the embroidery frame 5 in the X-axis direction.

The X-axis drive means 3, the YM drive means 4, the θ-axis drive means 2, the amplitude sewing drive means, and the minon drive moke 13 that drives the downward reciprocating movement of the needle are controlled by the control mechanism shown in FIG. are doing.

The control mechanism includes a pattern information reading device 62 that reads pattern information 61 of the stitch 16 provided by a paper tape, a magnetic disk, a floppy disk, etc., and a pattern information reading device 62 that reads the pattern information 61 of the stitch 16 provided by a paper tape, a magnetic recording medium, a floppy disk, etc. angle, displacement of the embroidery frame 5 in the X-axis direction and Y-axis direction, needle 15
A storage/arithmetic device 63 that stores and processes the amplitude of the oscillation.
It is equipped with Furthermore, the control mechanism includes a pulse generator 65
The pulses generated from the drive circuits 67 (0-axis drive circuit, X-axis drive circuit, Y-axis drive circuit) according to the type of the drive circuit 67, and the θ-axis drive motor 25, X I
The +l+ drive motor 35, the Y-axis drive motor 42, and the amplitude drive motor 14 are pulse-controlled. That is, "two motors 25, 35, 42, each needle 15 once in I4"
For each step of 2F movement, the rotation angle increment △0, the X-axis direction displacement increment △X, the Y-axis direction displacement increment △Y, and
It is configured to give the increment/\W of the amplitude W of the swinging of the needle as control data. In addition, signals from the storage device are also sent to the sewing machine drive motor 13 via the sewing machine control device 68 to start, stop, change speed, etc. It's starting to get better.

Next, the operation of the embroidery sewing machine constructed as described above will be explained.

In Figures 6 to 8, the position of the first stitch is PO and the values shown in Table I on the next page are used for each step.
, ΔY1 Δθ, and ΔW will be explained.

First, the first step is △X, as shown in Table 1.
---],] Sewing I, △Y Knee-487, △θ
-4, the control value of △W=6 is obtained by the control mechanism described in 1.
X-axis drive motor 35, Y-axis drive motor 42, θ, respectively
It is applied to the shaft drive motor 25 and the amplitude drive motor 14. '' The drive motors of the two legs are operated, and the angle of the embroidery frame 5 with respect to the amplitude direction of the needle 15 changes due to the displacement of the X-direction rack 32 and the Y-direction rack 45 and the rotational displacement of the annular plate 21.

The needle 15 descends with the above amplitude to reach the seam point [Pll
, and forms a stitch from [PO] to [Pll. The positional relationship between the above [PO2 point and [Pll point] is as shown in FIG.

In FIG. 8, CI (neutral point) is theoretically the center point of the needle amplitude, and is a point that constitutes a stitch point when the amplitude is W1-0.

Thereafter, by repeating the above operation, the needle 15 moves to the stitch points [Pll, [P2], . . . as shown in FIGS. 6 and 7.
...[PI3. ] to create a zigzag pattern.

In addition, in the example of Table 1, the increment of the rotation angle of the annular plate 2 is
θ, the increment ΔX of displacement in the X direction and the Y direction, and the increment ΔW of ΔY1 amplitude are exaggerated to several times their actual size for illustrative purposes.

At this time, as described in ``1'', both the X-axis drive means 3 and the Y-axis drive means 4 are mounted on the O-axis drive means 2, which is arranged concentrically with the neutral point of the needle 15, and together with the O-axis drive means 2. Since it has a rotating configuration, the value of the control variable for each step can be freely changed without regard to the data of other controlled axes.

Figures 9 (A,) to (E) show examples in which the control data has been changed in various ways, where (A) shows the basic pattern, and the pattern (B) is a zigzag variation of the basic pattern (A). Thinner than width 1
In this case, only the amplitude W of the data of the basic symbol (A) is changed (△wxo, 7).

The pattern (C) is a curved version of the basic pattern (A), and only the △0 of the basic pattern data has been changed (△
Ox1.2).

In the pattern (D), changes have been made to △Y (△yxo, 'i') in order to reduce the overall length compared to the basic pattern (∆).

Since the pattern (E) reduces the entire basic pattern (A),
Changes have been made to △X and △Y (△X×07, △XX0
．． 7).

As mentioned above, the basic pattern control data △X, △Y, △θ,
By freely changing ΔW, the length, width, and bending angle of the basic pattern can be changed arbitrarily.

Moreover, as mentioned above, each step of the control variables can be changed independently, so the starting point of the design, that is, the position of the initial neutral point (CO), can be changed by changing the position of the cloth held in the embroidery hoop 5. Can be taken at any point. Therefore, in this embodiment, as shown in FIG.
As shown in the figure, it is possible to freely create embroidery by changing the direction and size of the design. In FIG. 10, a symbol 70a is a basic symbol, and a symbol 70b is a basic symbol in which + and - of ΔX are replaced. 70c is the basic pattern △X and △Y multiplied by 07, and 70
d is the basic pattern △Y with + and - swapped,
70e is a basic pattern in which + and - of △X and △Y are exchanged.

Next, the operation of another embodiment according to the data in Table 2 listed on the next page will be described with reference to FIG. 1I and FIGS. 12(A)-(Q).

In the example of Table 2, as in the example of j-description 1, Δ0
, △X1△Y, and △W are given as control variables. In Figure 1I and Figure 12, [PO]...[]]
+6] is the seam point, Wl is the amplitude, (CO)...(C1
0) shows the points of complaint in Table 1. ing.

In the example shown in Table 1, the sting 1. Although the operation has been explained by focusing only on the loose cloth, in the example shown in Table 2, the first
The explanation will be focused on the movement of the neutral point of the needle I5 for each step as shown in FIG. 2(A) to FIG. 12(Q).

In FIGS. 12(A) to 12(Q), line X and line Y represent the X-axis direction and Y-axis direction in each step. That is, the intersection of line X and line Y (shown only in FIG. 12(A)) is the neutral point C1 of needle I5, that is, the annular plate 2I.
represents the center of rotation.

As shown in FIG. 12(A), in the initial position, the needle I5 makes the stitch point [PO], and then the data shown in step 0 of Table 2 is given, and the embroidery frame 5 moves toward the X-axis drive means 3 and Y
215 in the X-axis direction and 3. in the Y-axis direction by the shaft drive means 4.
78 and 40.72 by the θ-axis driving means 2.
The needle I5 is rotated by 605° and enters the stitch point [P1] with an amplitude of 605, forming a stitch between the stitch points [PO] and [P4], as shown in FIG. 12(B). Below, each control variable from step 1 to step I5 in Table 2 is given, and the first
As shown in Figure 2 (B) to Figure 12 (0), the number 1
The cloth held under tension by the frame 5 is passed under the neutral point C of the needle by the X-axis drive means 3, the Y-axis drive means 4, and the θ-axis drive means 2, and embroidery is created.

As is clear from the above explanation, in the embroidery machine according to the present invention, the embroidery hoop is rotationally displaced by the θ-axis drive means that always rotates concentrically with the neutral point of the needle (the center axis when the needle is stopped). Since the structure is configured to be displaced in the X-axis direction and the Y-axis direction by the X-axis and Y-axis drive means that rotate together with the θ-axis drive means, the increment of the rotation angle, the X-axis direction and the Y-axis direction Control variables such as increments and even needle swing amplitude increments can be easily changed independently of other control variables. Therefore, the length of the embroidered design, ij
It is possible to easily make changes such as the following.

Further, it has the advantage that embroidery can be embroidered at any position on the cloth held in the embroidery frame.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the embroidery sewing machine according to the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a left side view of Fig. 1, and Fig. 4 is a front view of Fig. 1. Figure 5 is a schematic diagram of the control device, Figures 6 and 7 are schematic diagrams showing the stitch configuration, Figure 8 is a partially enlarged view of Figure 7, and Figures 9 (Δ) to 9. Figure (E)
10 is a schematic diagram showing an example of changing the basic design by changing the control data, FIG. 10 is a schematic diagram showing multiple embroidery designs to be made on cloth held under tension in an embroidery frame, and FIG. 11 is a separate diagram. Schematic diagram showing the embroidery stitch configuration of the embodiment, No. 12
Figures (A) to 12 (Q) are drawings showing the state in which the embroidery stitch structure is created step by step. I. Embroidery sewing machine, 2..theta.axis drive means, 3.
...X-axis drive means, 4...Y-axis drive means, 5...
・Embroidery frame, I3.14.25.35.42...Motor, 15 needles,
21 Annular plate, 31.41 Long pinion, 32.45 ・Rack.

Claims (1)

[Scope of Claims] 1. An amplitude sewing drive means for swinging a needle that reciprocates up and down at a given amplitude around the neutral point of the needle; and an embroidery frame that holds the fabric to be embroidered under tension; X-axis and Y-axis driving means for displacing the needle in directions perpendicular to each other in a plane perpendicular to the neutral point of the needle, and θ-axis driving means for rotating the embroidery frame around the neutral point of the needle. The X-axis drive means and the Y-axis drive means are arranged so as to be rotated together with the embroidery frame by the θ-axis drive means, and the θ-axis drive means rotate the needle about the central axis of the needle. The embroidery frame is moved independently in the X-axis direction and the Y-axis direction using the X-axis drive means and the Y-axis drive means, and the increments in the displacement of the embroidery frame in the X-axis and Y-axis directions and the increments in the rotation angle are determined. and an embroidery sewing machine, characterized in that the increment of the amplitude of the swing of the needle is applied and controlled independently of each other. 2. The θ-axis driving means has a structure in which the annular plate is always rotated concentrically with the central axis through a transmission mechanism using a motor, and the X-axis and Y-axis driving means are disposed on the annular plate. The embroidery frame is supported by a support member that is moved in the X-axis and Y-axis directions by X-axis and Y-axis drive means, and a needle amplitude sewing drive means is added to the arm of the sewing machine. 2. The embroidery sewing machine according to claim 1.