JPH06257059A - Web-spreading device of embroidery machine - Google Patents

Abstract

PURPOSE:To efficiently sew the plural positions of a web to be processed by automatically rotating the web. CONSTITUTION:A cylindrical web-spreading frame 2 for spreading a web to be processed is inserted onto the bed 1 of an embroidery machine, and longitudinally movably and rotatably supported on a part of a frame through guide rods 5 with a pair of supporting arms 6. Mutually faced two openings 9a, 9b are formed in the tip of the web-spreading frame 2 in correspondence to a needle-falling hole 8. The web W is spread on the web-spreading frame 2 so as to cover the openings 9a, 9b, and held with a holder 10. A movable frame 14 is attached to a covering plate 15, and a wire 19 is wound on the outer periphery of the web-spreading frame 2 and disposed below the lower surface of the covering plate 15 in a tensed state. The web-spreading frame is longitudinally moved with the longitudinal movement of the movable frame 14 through the fitting of projections 4 to grooves 17, and is half-rotated with the lateral movement of the movable frame 14 through the wire 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth tensioning device for tensioning and holding a work cloth having a tubular shape such as a sock, a sponge or a cap when the work cloth is sewn at a needle drop point of a sewing machine.

[0002]

2. Description of the Related Art Conventionally, as a cloth tensioning device for an embroidery sewing machine, for example, Japanese Patent Application Laid-Open No. 60-252759 and Japanese Patent Application Laid-Open No.
The technique disclosed in Japanese Patent No. 229860 is known.
In these cloth tension devices, a tubular cloth tension frame for tensioning the work cloth is inserted outside the bed, and is supported so as to be movable back and forth and rotatable with respect to a part of the machine frame. One opening is formed in the cloth tension frame at a position corresponding to the needle entry hole of the sewing machine bed, and embroidery stitches are formed on the work cloth covering the opening.

[0003]

However, according to the conventional cloth tensioning device, since there is only one opening, for example, when embroidering both sides of a sock, after embroidering one side, Since the opposite side is embroidered, there is a problem that the sock is turned over and reattached to the cloth tension frame, resulting in a decrease in work efficiency.

Therefore, an object of the present invention is to provide a cloth tensioning device capable of automatically rotating a work cloth and efficiently sewing a plurality of places.

[0005]

In order to solve the above problems, according to the present invention, a tubular cloth tension frame for stretching a work cloth is inserted into the outer peripheral side of the bed, and the tension frame is part of the machine frame. In a cloth tensioning device for a sewing machine that is rotatably and rotatably supported on a sewing machine, at least two openings are arranged side by side in a circumferential direction in a cloth tension frame, and these openings are selectively above the needle drop holes of the bed. A holder for rotating the upholstery frame so as to be arranged and for providing a drive mechanism for moving the upholstery frame back and forth to form a stitch and for holding the work cloth on the upholstery frame in a state of covering the opening. Was set up.

The cloth tensioning device of the present invention can be applied to both an embroidery sewing machine and a lockstitch sewing machine. In the case of an embroidery sewing machine, as the drive source of the "drive mechanism", for example,
You can use the movement of the existing movable frame from front to back and left to right. The lateral movement of the movable frame is converted into a half-rotational motion of the cloth tension frame via an appropriate power transmission means such as a wire, a timing belt, a rack and a pinion. Further, a dedicated actuator such as a motor or a cylinder may be provided as a drive source.
Further, the number of the "openings" may be two or three or more, and the mutual interval between them is appropriately determined according to the demand of sewing work.

[0007]

According to the cloth tensioning device of the present invention, at least two openings arranged side by side in the cloth tension frame are selectively arranged above the needle drop holes as the cloth tension frame rotates. Therefore, when processing multiple locations on the work cloth, after sewing one location located at one opening, rotate the work cloth as it is without re-tensioning the work cloth and place another location located at another opening. Can be sewn continuously and can be processed efficiently.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in an embroidery sewing machine will be described below with reference to the drawings. FIG. 4 shows an embroidery sewing machine 20.
, And 21 is the machine frame. A head 22 is mounted on the machine frame 21, and the needle 2 is attached to the tip of the head 22.
3 is provided so as to be vertically driven. Below the embroidery head 22, a cylindrical bed 1 is provided on the machine frame 21 so as to project forward.
Is located.

As shown in FIGS. 1 to 3, a cylindrical cloth tension frame 2 for stretching a work cloth W (socks in the illustrated example) is inserted through the outer peripheral side of the bed 1, and a pair of base cloths are provided at the base ends thereof. Circumferential groove 3
And the convex portion 4 are formed. A pair of support arms 6 are slidably inserted on the two guide rods 5 projecting forward from the machine frame 21, and the support arms 6 are fitted in the circumferential groove 3 so as to be relatively rotatable. A support piece 7 is provided. As a result, the cloth tension frame 2 has the support arm 6 supported by a part of the machine frame 21 so as to be movable back and forth and rotatable.

At the tip of the cloth tension frame 2 corresponding to the needle drop hole 8 of the bed 1, two openings 9a and 9b are provided in the circumferential direction 180.
They are juxtaposed so as to face each other at a position apart from each other. A holder 10 made of a C-shaped elastic plate for holding the work cloth W is attached to the outer periphery of the cloth tension frame 2, and the opening 9 is formed in the holder 10.
An opening 11 larger than a and 9b and a detachable fitting 12 are provided. Then, the needles 23 passing through the needle drop holes 8 and the shuttle 13 installed in the bed 1 cooperate with each other to open the openings 9a and 9b.
Embroidery stitches are formed on the work cloth W in a portion corresponding to. As the holding tool 10, other than the illustrated example, a stretchable band-shaped member, a holding metal fitting integrally attached to the cloth tension frame 2, or the like can be used.

The machine frame 21 is provided with a movable frame 14 that feeds the work cloth W forward and backward and to the left and right during normal embroidery sewing. A cover plate 15 is removably attached to the movable frame 14 with screws 16 so as to cover the base end of the cloth tension frame 2 from above. Groove 17 is engraved. A wire 19 is stretched on the lower surface of the cover plate 15 with two bolts 18, and a part of the wire 19 is wound around the outer circumference of the cloth tension frame 2.

A drive mechanism is constituted by the movable frame 14, the covering plate 15, and the wire 19, and the cloth tension frame 2 fits the convex portion 4 and the groove 17 as the movable frame 14 moves in the front-rear direction. The wire 19 is moved back and forth through it, and is half-turned in both forward and reverse directions by the wire 19 as the movable frame 14 is moved in the left-right direction, and is reciprocally turned at each rotational position. The amount of movement of the movable frame 14 is program-controlled based on the embroidery data.

In the cloth tensioning device of this embodiment constructed as described above, the two openings 9a formed in the cloth tension frame 2 are
As shown in FIGS. 2 and 3, 9b is selectively arranged above the needle drop hole 8 as the cloth tension frame 2 rotates halfway. For this reason, when processing both sides of the work cloth W, after the embroidery work on one side located in one opening 9a, the work cloth W is automatically inverted 180 ° in the same state, and the other opening 9 is processed.
The opposite surface located at b is continuously embroidered. Therefore,
Unlike before, there is no need to re-tension the work cloth W,
Both sides can be processed efficiently.

The present invention is not limited to the above-described embodiments, and the shapes and configurations of the respective parts can be appropriately modified and embodied without departing from the spirit of the present invention.

[0015]

As described in detail above, according to the cloth tensioning device for a sewing machine of the present invention, at least two openings formed in the cloth tension frame are selected above the needle drop holes as the cloth tension frame rotates. Since the work cloth is automatically arranged, the work cloth can be automatically rotated to efficiently sew a plurality of places.

[Brief description of drawings]

FIG. 1 is a perspective view of a cloth tensioning device of an embodiment embodying the present invention in an embroidery sewing machine.

FIG. 2 is a sectional view showing a main part of the cloth tensioning device.

FIG. 3 is a cross-sectional view showing a main part of the cloth tensioning device in an operating state different from that in FIG.

FIG. 4 is a perspective view showing the entire embroidery sewing machine.

[Explanation of symbols]

1 bed 2 cloth tension frame 8 needle drop holes 9a, 9b opening 10 holder 14 movable frame 15 cover plate 19 wire 20 embroidery sewing machine 21 machine frame

Claims (1)

[Claims] 1. A sewing machine tensioning device in which a tubular cloth tension frame for tensioning a work cloth is inserted into an outer peripheral side of a bed, and the cloth tension frame is supported by a part of a machine frame so as to be movable back and forth and rotatable. , At least two openings are provided side by side in the circumferential direction in the cloth tension frame, and the cloth tension frame is rotated so that the openings are selectively disposed above the needle drop holes of the bed and the stitches are formed. A drive mechanism for moving the cloth tension frame back and forth for forming is provided,
A cloth tensioning device for a sewing machine, comprising a holder for holding the work cloth on the cloth tension frame in a state of covering the opening.