JP3287638B2 - Sewing machine upholstery device and sewing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth stretching apparatus for stretching and holding a work cloth at a needle drop point of a sewing machine when sewing a cylindrical work cloth such as a sock, a trouser, and a hat.

[0002]

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

[0003]

However, according to the conventional cloth stretching apparatus, since there is only one opening, for example, when embroidering both sides of a sock, after embroidering one side, In order to embroider the opposite surface, the sock needs to be turned upside down and re-attached to the upholstery frame, resulting in a problem that the working efficiency is reduced.

[0004] Therefore, an object of the present invention is to provide a cloth upholstery capable of automatically rotating a work cloth and sewing efficiently at a plurality of locations.

[0005]

In order to solve the above-mentioned problems, in a sewing machine upholstering apparatus according to the present invention, a tubular upholstery frame for stretching a work cloth is inserted into the outer peripheral side of a bed, and the upholstery is provided. In a sewing machine upholstery device in which a frame is supported on a part of a machine frame so as to be able to move back and forth and rotate, at least two openings are arranged in the upholstery frame in a circumferential direction, and a work cloth is covered with the opening. A holding tool for holding on the upholstery frame is provided, and the upholstery frame is rotated together with the holding tool and the work cloth so that these openings are selectively positioned above the needle drop holes of the bed, and a stitch forming operation is performed. For this purpose, a drive mechanism for moving the cloth tension frame back and forth and rotating together with the holder and the work cloth is provided. In the sewing method using a sewing machine according to the present invention, at least two openings are arranged in a circumferential direction on a tubular upholstered frame inserted on the outer peripheral side of the bed, and the work cloth is covered with the holder. And the back and forth movement and rotation of the upholstery frame together with the holder and the work cloth for stitch formation by the drive mechanism, and into the one opening arranged above the needle drop hole of the bed. After sewing one position of the work cloth located, the upholstery frame is rotated together with the holder and the work cloth by the drive mechanism so that the other opening is located above the needle drop hole of the bed, and the drive mechanism is used for stitching For forming, the upholstery frame is moved back and forth and rotated together with the holder and the work cloth, and another part of the work cloth located at another opening is continuously sewn.

Here, the cloth stretching apparatus of the present invention is applicable to both embroidery sewing machines and lockstitch sewing machines. In the case of an embroidery sewing machine, for example, as a drive source of the “drive mechanism”,
The front, rear, left and right movements of the existing movable frame can be used. The left-right movement of the movable frame is converted into a half-rotational movement of the upholstered 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 their mutual interval is appropriately determined according to a demand for sewing.

[0007]

According to the cloth stretching apparatus of the present invention, at least two openings provided side by side with the cloth upholstery are selectively arranged above the needle drop holes as the cloth upholstery rotates. Therefore, when processing a plurality of places on the work cloth, after sewing one place located at one opening, the work cloth is rotated in the same state without re-stretching, and another place located at another opening is made. Sewing can be continued, and processing can be performed efficiently.

[0008]

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 a needle 2 is
3 is provided so as to be able to be driven up and down. Below the embroidery head 22, a cylindrical bed 1 protruding forward from the machine frame 21 is provided.
Is located.

As shown in FIGS. 1 to 3, a cylindrical upholstery frame 2 for stretching a work cloth W (socks in the illustrated example) is inserted into the outer peripheral side of the bed 1, and a pair of base frames is provided at the base end thereof. Circumferential groove 3
And the projections 4 are formed. A pair of support arms 6 are slidably inserted into two guide rods 5 projecting forward from the machine frame 21, and each support arm 6 is fitted into the circumferential groove 3 so as to be relatively rotatable. A support piece 7 is provided. Thus, the upholstered frame 2 supports the support arm 6 on a part of the machine frame 21 so as to be able to move back and forth and rotate.

At the tip of the upholstered frame 2 corresponding to the needle drop hole 8 of the bed 1, two openings 9a and 9b are formed in the circumferential direction.
゜ They are arranged side by side so as to face each other at a remote position. A holder 10 made of a C-shaped elastic plate for holding the work cloth W is attached to the outer periphery of the upholstered frame 2.
An opening 11 larger than a and 9b and a detachable metal fitting 12 are provided. Openings 9a and 9b are formed by cooperation of a needle 23 penetrating the needle drop hole 8 and a shuttle 13 housed in the bed 1.
An embroidery stitch is formed on the work cloth W at a portion corresponding to. In addition, as the holding tool 10, other than the illustrated example, an elastic band-shaped member, a holding member integrally attached to the upholstery frame 2, or the like can be used.

The machine frame 21 is provided with a movable frame 14 for feeding the work cloth W in the front-back and left-right directions during normal embroidery sewing. A cover plate 15 is detachably attached to the movable frame 14 with screws 16 so as to cover the base end of the upholstered frame 2 from above, and a lower surface of the cover plate 15 is fitted with the projection 4 of the upholstered frame 2. Grooves 17 are formed. A wire 19 is stretched on the lower surface of the covering plate 15 by two bolts 18, and a part thereof is wound around the outer periphery of the upholstered frame 2.

A driving mechanism is constituted by the movable frame 14, the covering plate 15, and the wire 19. The cloth-covered frame 2 engages the projection 4 with the groove 17 as the movable frame 14 moves in the front-rear direction. The movable frame 14 is rotated halfway in the forward and reverse directions by the wire 19 with the left and right movement of the movable frame 14, and is reciprocated at each rotational position. The amount of movement of the movable frame 14 is program-controlled based on the embroidery data.

In the upholstery device of this embodiment configured as described above, the two openings 9a, 9b,
As shown in FIGS. 2 and 3, 9 b is selectively arranged above the needle drop hole 8 with the half rotation of the upholstery frame 2. For this reason, when processing both surfaces of the work cloth W, after the embroidery processing of one side located in one opening 9a, the work cloth W is automatically inverted by 180 ° as it is, and the other opening 9 is turned.
The opposite surface located at position b is embroidered. Therefore,
Unlike the past, there is no need to rework the work cloth W,
Both-side processing can be performed efficiently.

The present invention is not limited to the above embodiment, but may be embodied by appropriately changing the shape and configuration of each part without departing from the spirit of the invention.

[0015]

As described above in detail, according to the sewing machine upholstering apparatus of the present invention, at least two openings formed in the upholstery frame are selected above the needle drop holes with the rotation of the upholstery frame. Since the work cloth is automatically arranged, the work cloth can be automatically rotated and a plurality of locations can be efficiently sewn.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view showing a main part of the upholstering device.

FIG. 3 is a sectional view showing a main part of the upholstery device in an operation state different from that in FIG. 2;

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

[Explanation of symbols]

1 Bed 2 Clothed frame 8 Needle drop hole 9a, 9b Opening 10 Holder 14 Movable frame 15 Coating plate 19 Wire 20 Embroidery sewing machine 21 Machine frame

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D05C 9/04-9/06 D05B 39/00

Claims (2)

(57) [Claims] 1. A sewing machine stretching apparatus in which a tubular upholstery frame for stretching a work cloth is inserted into an outer peripheral side of a bed, and the upholstery frame is supported on a part of a machine frame so as to be able to move back and forth and rotate. At least two openings are provided in the upholstered frame in the circumferential direction, and a holder is provided for holding the work cloth on the upholstered frame in a state of covering the openings, and the opening is selectively provided. The upholstery frame is rotated together with the holder and the work cloth so as to be arranged above the needle drop hole of the bed, and the upholstery frame is moved back and forth together with the holder and the work cloth to form a stitch. An upholstery device for a sewing machine, comprising a driving mechanism for rotating the sewing machine. 2. At least two openings are arranged in a circumferential direction on a tubular upholstery frame to be inserted into the outer peripheral side of a bed, and a work cloth is covered by a holding tool on the upholstery frame in a state of covering the openings. The cloth tension frame is moved back and forth and rotated together with the holder and the work cloth to form a stitch by a driving mechanism, so that the frame is positioned at the one opening located above the needle drop hole of the bed. After sewing one part of the work cloth to be sewn, the cloth tension frame is rotated by the driving mechanism together with the holding tool and the work cloth so that the separate opening is arranged above the needle drop hole of the bed, The cloth tension frame is moved back and forth and rotated together with the holder and the work cloth to form a stitch by a drive mechanism, and another part of the work cloth located at the different opening is continuously sewn. Sewing method by sewing machine.