JPH062253A - Embroidery hoop - Google Patents

Abstract

PURPOSE:To prevent looseness of fabric during embroidery by obtaining holding force of a fabric nearly uniform over whole circumstance and free from partial deficiency in an embroidery hoop having a square shape. CONSTITUTION:In an embroidery hoop 1 holding fabric between the inner circumference face of nearly rectangular outer hoop 2 and outer circumference face of nearly rectangular inner hoop 3, cut-off parts 4ab and 4cd are provided in diagonal two corner parts among four corner parts of the outer hoop 2 and two spread and contract adjusting mechanisms 6 for spreading and contracting the outer hoop 2 by adjusting intervals of cut-off parts 4ab and 4cd between cut-off end parts 5 interposing these cut-off parts. By adjusting the interval of either one cut-off part 4ab by spread and contraction adjusting mechanisms 6, length of long side 2a and short side 2b interposing the cut-off part 4ab are changed and by adjusting the interval of other cut-off part 4cd by the spread and contract adjusting mechanism 6, length of long side 2c and short side 2d interposing the cut-off part 4cd is changed and the outer hoop 2 is nearly uniformly spread or contracted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embroidery frame used for holding and spreading cloth in an embroidery sewing machine.

[0002]

2. Description of the Related Art In an embroidery sewing machine, a circular embroidery frame 41 as shown in FIG.
A substantially rectangular embroidery frame 51 as shown in FIG. 6 is used. Each of the embroidery frames 41, 51 is composed of outer frames 42, 52 and inner frames 43, 53 fitted therein, and the circular outer frame 42 has a substantially rectangular outer frame 52 at an arbitrary position.
In this case, the cutouts 44 and 54 are provided at any one of the four corners, and the cutoffs 44 and 54 are provided.
Expansion / contraction adjustment mechanisms 46, 56 are provided between the separation ends 45, 55 sandwiching the outer frame 42, 55 to adjust the outer frames 42, 52 for expansion / contraction by adjusting the distance between the separation parts 44, 54.

In order to spread the cloth in the embroidery frames 41, 51, the outer frames 42, 52 are previously adjusted by the expansion / contraction adjusting mechanisms 46, 5.
6 is adjusted to an appropriate size according to the thickness of the cloth, the cloth is placed on the outer frames 42 and 52, and the inner frames 43 and 53 are further placed inside the outer frames 42 and 52 together with the cloth. The inner peripheral surfaces of the outer frames 42 and 52 and the inner frames 43 and 53.
It is done by sandwiching the cloth with the outer peripheral surface of the. Here, in the circular outer frame 42, the outer frame 42 is expanded and contracted substantially uniformly over the entire circumference by adjusting the distance between the cut-off portions 44 by the expansion and contraction adjusting mechanism 46, so that the outer frame 42 and the inner frame 43 are expanded and contracted. The clamping force of the cloth due to and can be obtained almost uniformly over the entire circumference.

[0004]

However, in the substantially rectangular outer frame 52, the outer frame 5 sandwiching the separating portion 54 is adjusted by adjusting the interval of the separating portion 54 by the expansion / contraction adjusting mechanism 56.
The lengths of the long side 52a and the short side 52b of 2 certainly change, but the lengths of the remaining long side 52c and the short side 52d do not change so much. Therefore, the holding force of the cloth at the long side 52c and the short side 52d. However, there was a problem that the fabric gradually slipped out during embroidery and the stretch was loosened. This problem was particularly remarkable on the long side 52c having a large radius of curvature.

The object of the present invention is to solve the above-mentioned problems, and even with a rectangular embroidery frame, it is possible to obtain a substantially uniform clamping force for the fabric over the entire circumference, and a partial lack of the fabric can be obtained. An object of the present invention is to provide a new embroidery frame capable of preventing loosening.

[0006]

In order to achieve the above object, according to the present invention, a cloth is sandwiched between an inner peripheral surface of a rectangular outer frame and an outer peripheral surface of a rectangular inner frame to embroider the cloth. In an embroidery frame that is designed to be stretched in the frame, cutouts are provided at two or more corners of the outer frame, and the distance between the cutouts is adjusted between the cutoff ends that sandwich the cutouts. Therefore, two or more expansion / contraction adjusting mechanisms for expanding / contracting the outer frame are provided.

Here, the outer frame and the inner frame are generally quadrangular in shape, but may be, for example, hexagonal, octagonal or the like. The cut-off portions are preferably provided at every other corner of the outer frame, and for example, in the case of a quadrangular outer frame, they may be provided at two diagonal corners. The present invention is not limited to the specific structure of the expansion / contraction adjusting mechanism.

[0008]

In order to spread the cloth in the embroidery frame of the present invention, the outer frame is adjusted in advance to a proper size according to the thickness of the cloth by operating two or more expansion / contraction adjusting mechanisms in advance. .
At this time, by adjusting the interval of a certain cut portion by the expansion / contraction adjusting mechanism, the lengths of two sides of the outer frame sandwiching the cut portion are changed, and the intervals of other cut portions are adjusted by another expansion / contraction adjusting mechanism. The lengths of the other two sides sandwiching the cut-off portion are changed by adjusting by, so that the outer frame is expanded and contracted substantially uniformly. By placing the fabric on the outer frame, further placing the inner frame and pushing it into the outer frame together with the fabric, and sandwiching the fabric between the inner peripheral surface of the outer frame and the outer peripheral surface of the inner frame, the fabric is embroidered. Expand in the frame. Since the outer frame is adjusted to be substantially evenly expanded and contracted as described above, it is possible to obtain a substantially uniform clamping force for the fabric over the entire circumference.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of an embroidery frame embodying the present invention will be described below with reference to FIGS. The embroidery frame 1 of the present embodiment is composed of an outer frame 2 having a substantially rectangular shape and an inner frame 3 fitted inside the outer frame 2, and a cloth 15 is provided between the inner peripheral surface of the outer frame 2 and the outer peripheral surface of the inner frame 3. It is pinched. This embroidery frame 1
A drive frame provided on a table of an embroidery sewing machine (not shown) is horizontally attached at attachment portions 12 provided on both sides of the outer frame 1 and is driven in the front-rear, left-right directions.

The outer frame 2 is made of glass fiber reinforced plastic having high strength and elasticity.
And an inner lining 22 made of polyurethane resin having a high flexibility and a high friction coefficient on the inner peripheral side. The inner lining 22 has anchor holes 23 provided in various places on the outer frame body 21.
It is prevented from coming off the outer frame main body 21 by cutting into. The long sides 2a, 2c and the short sides 2b, 2d of the outer frame 2 are curved so as to bulge outward with a predetermined radius of curvature, and the four corners are also rounded.

Outer four corners of the outer frame 2 are provided at two diagonally opposite corners with cut-off portions 4ab and 4cd, and two expansion / contraction adjusting mechanisms 6 are provided between the cut-off end portions 5 sandwiching these. Is provided. Each expansion / contraction adjusting mechanism 6 has two protrusions 8 projecting from the outer peripheral surface of each cut-off end 5 and formed with internal threads 7 from the end surface, and two external threads 9 screwed into these internal threads 7. And an adjusting member 11 that integrally has a rotating plate 10 in the middle thereof.

In each expansion / contraction adjusting mechanism 6, one female screw 7 and the male screw 9 are right-hand screws, and the other female screw 7 and the male screw 9 are left-hand screws. Therefore, when the rotary plate 10 is rotated in one direction by a finger, The male screws 9 are deeply screwed into the female screws 7 to reduce the distance between the cut-off portions 4ab and 4cd, and when rotated in the other direction, the male screws 9 are retracted from the female screws 7 to separate the cut-off portions 4ab and 4c.
The distance d increases. As described above, in the present embodiment, the two separating portions 4ab,
By adjusting the interval of 4 cd, the outer frame 2 can be expanded / contracted substantially evenly.

The inner frame 3 is made of glass fiber reinforced plastic having high strength and elasticity and is formed in a reduced shape substantially similar to the outer frame 2 so that it can be fitted inside the outer frame 2. More specifically, the long sides 3a, 3c and the short sides 3b, 3 of the inner frame 3
The radius of curvature of the outer peripheral surface of d is the long side 2a of the corresponding outer frame 2,
2c and the short sides 2b, 2d are formed to be slightly smaller than the radius of curvature of the inner peripheral surface, and when the inner frame 3 is fitted into the outer frame 2, the corresponding sides of the outer frame 2 and the inner frame 3 press against each other due to elasticity. The fabric 15 can be held firmly by sandwiching each other.

The cloth 1 is attached to the embroidery frame 1 constructed as described above.
In order to stretch 5, the outer frame 2 is expanded and contracted to an appropriate size according to the thickness of the fabric 15 by previously operating the two expansion and contraction adjusting mechanisms 6 provided diagonally as described above. At this time, by adjusting the distance between the one cut portion 4ab by the expansion / contraction adjusting mechanism 6, the lengths of the long side 2a and the short side 2b sandwiching the cut portion 4ab are changed, and the other cut portion 4cd is changed. By adjusting the distance by the expansion / contraction adjusting mechanism 6, the cut-off portion 4cd
Since the lengths of the long side 2c and the short side 2d sandwiching the space change, the outer frame 2 expands and contracts substantially uniformly.

Next, as shown in FIG. 2, the cloth 15 is placed on the outer frame 2, and the inner frame 3 is further placed. Then, FIG.
As shown in FIG. 2, the inner frame 3 is pushed into the outer frame 2 together with the cloth 15, and the cloth 15 is sandwiched between the inner peripheral surface of the outer frame 2 and the outer peripheral surface of the inner frame 3, so that the cloth 15 is embroidered. Expand within 1. Since the outer frame 2 is adjusted to be substantially evenly expanded and contracted as described above, the cloth 15 is substantially uniform over the entire circumference and has no partial shortage.
Therefore, it is possible to obtain the clamping force and to prevent the cloth 15 from loosening during embroidery. Further, since the inner lining 22 made of polyurethane resin having a high flexibility and a high coefficient of friction is provided inside the outer frame 2 of this embodiment, the inner lining 22 prevents the cloth 15 from slipping out. To do.

Next, the embroidery frame 31 of the second embodiment shown in FIG.
The outer frame 2 and the inner frame 3 are formed in a substantially hexagonal shape, and the outer frame 2 is cut into four alternate corners 4ab, 4cd, 4ef.
Is provided, and the three expansion / contraction adjusting mechanisms 6 are provided between the cut-off end portions 5 that sandwich them, which is the only difference from the first embodiment. In the present embodiment, the number of cutting portions and the expansion / contraction adjusting mechanism are increased in response to the increase in the number of sides, and basically the same effect as that of the first embodiment is obtained.

The present invention is not limited to the configuration of the above-described embodiment, and can be embodied by appropriately changing it without departing from the spirit of the invention.

[0018]

Since the embroidery frame of the present invention is configured as described above, even if it is a rectangular embroidery frame, it is possible to obtain a substantially uniform clamping force for the fabric over the entire circumference. Therefore, it is possible to prevent loosening of the fabric during embroidery, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a plan view of an embroidery frame according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the embroidery frame before fitting.

FIG. 3 is a sectional view of the same embroidery frame after fitting.

FIG. 4 is a plan view of an embroidery frame according to a second embodiment.

FIG. 5 is a plan view of a conventional circular embroidery frame.

FIG. 6 is a plan view of a conventional substantially rectangular embroidery frame.

[Explanation of symbols]

1 Embroidery frame 2 Outer frame 3 Inner frame 4ab Separation part 4cd Separation part 4ef Separation part 5 Separation end part 6 Expansion / contraction adjusting mechanism 15 Cloth 31 Embroidery frame

Claims (1)

[Claims] 1. An embroidery frame in which a cloth is sandwiched between an inner peripheral surface of a rectangular outer frame and an outer peripheral surface of a rectangular inner frame so that the cloth is spread in the embroidery frame. Two or more expansion / contraction adjusting mechanisms that expand / contract the outer frame by providing cuts at two or more corners and adjusting the distance between the cuts between the cut ends that sandwich these cuts. An embroidery frame characterized by being provided.