JP2566251Y2 - Mounting structure of free arm cover on sewing machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine having a free arm for sewing tubular cuffs and hem of pants, and more particularly to a free arm which covers the free arm during normal sewing. The present invention relates to a cover mounting structure.

[0002]

2. Description of the Related Art In general, a cylindrical free arm opposed to a protruding portion is protruded from one side of a cloth base having a partially protruding portion on one side, and a free arm cover is detachably attached to the free arm. Sewing machines that are mounted are known.

In order to sew a tubular cuff or trouser hem, etc. using this kind of sewing machine, a free arm cover is removed from the sewing machine body, and a tubular free arm is attached to a cuff or pants. The cuffs and the hem of the pants are attached to the outer periphery of the free arm so as to be sewn. Also, when performing straight stitching such as side lines using this sewing machine, attach the free arm cover to the sewing machine so as to cover the free arm, and use the cloth on the top of the wide cloth base including the top of the free arm cover. The sewing is performed such that the feed is performed.

As described above, the free arm cover of one sewing machine is attached and detached depending on the shape of the portion to be sewn.

A conventional free arm cover mounting structure for detachably mounting the free arm cover to the sewing machine body is as shown in FIG.
A substantially U-shaped flat surface is formed on a side surface of an outer periphery of a cylindrical free arm 5 protruding from one side of a cloth base of a sewing machine body having a partial protruding portion on one side so as to face the protruding portion. The free arm cover (not shown) is formed with a substantially U-shaped convex ridge on a side surface of the outer periphery of the free arm cover, and the free arm cover has a convex ridge formed in the free arm 5. And the free arm cover is attached and fixed to the sewing machine main body.

[0006]

However, according to the above-described conventional free arm cover mounting structure, when the free arm cover is removed and the tubular cloth is sewn, the free arm 5 serving as a cloth passage portion is formed. Since the fitting groove 5a is formed on the side surface of the outer periphery, there is a problem that the cloth is caught in the fitting groove 5a and the cloth cannot be fed properly. Further, since the fitting groove is formed so as to be substantially U-shaped in a plane on the outer peripheral side surface of the free arm 5, the appearance is reduced when the free arm cover is removed and the tubular cloth is sewn. It was bad.

[0007] The present invention overcomes such problems in the prior art, can prevent the cloth feed failure when sewing is performed by removing the free arm cover, and furthermore, the appearance of the free arm can be reduced. An object of the present invention is to provide a mounting structure of a free arm cover of a sewing machine, which can overcome the inconvenience.

[0008]

In order to achieve the above-mentioned object, the attachment structure of the free arm cover of the sewing machine according to the present invention is provided on one side of the cloth base of the sewing machine body having a partial projection on one side. A sewing machine having a cylindrical free arm protruding therefrom and having a free arm cover detachably attached to the free arm, wherein a free arm is provided on a side surface of the protruding portion of the cloth base opposed to a side surface of the free arm. A guide groove or a guide ridge for attaching / detaching a free arm cover extending in a direction of inserting / removing the cover is formed, and a holding means including a concave / convex portion for holding the free arm cover is formed on a distal end surface of the free arm. A guide ridge or guide groove slidably fitted to the guide groove or guide ridge on the free arm cover, and fitted to the holding means. It is characterized in that a part or recess formed respectively.

[0009]

According to the attachment structure of the free arm cover of the sewing machine of the present invention, the guide groove for attaching and detaching the free arm and the projection of the free arm cover are located at a position where the free arm cover cannot be brought into contact with the cloth when sewing is performed by removing the free arm cover. Since the guide recess for insertion is formed, there is no unevenness on the outer peripheral surface of the free arm that becomes the cloth passage part when sewing by exposing the free arm, and therefore, the fabric feeding during sewing is good. And smooth sewing can be performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. Note that the same components as those of the above-described conventional device are denoted by the same reference numerals and described.

FIG. 1 is an exploded perspective view showing a structure of a main part of a lock sewing machine to which a structure for attaching a free arm cover according to the present invention is applied.

The sewing machine body 1 of the lock sewing machine according to the present invention.
On one side, a cloth base 2 having a partial protrusion 3 on one side and supporting the cloth to be sewn from below is formed. Opposite cylindrical free arms 5 project from each other with a gap 4 therebetween. The free arm 5 is adapted to cover the outer circumference of the free arm 5 with a cuff, a hem of pants or the like when sewing a cuff or a hem of pants. The upper surfaces of the cloth base 2, the protruding portion 3 of the cloth base 2, and the free arm 5 are formed in the same horizontal plane. In addition, reference numeral “2” is assigned to each of the four positions constituting the cloth base 2.

On the other hand, a free arm cover 6 which can be detachably attached to the free arm 5 is provided. The free arm cover 6 has a substantially U-shape in plan view by a base 7 and both side portions 8 and 9 protruding from the base 7. Even when the free arm cover is mounted on the free arm 5, the upper surface of the free arm 5 is formed. Most are intended to expose the area. The one side portion 8 is adapted to be inserted between the protrusion 3 of the cloth base 2 and the free arm 5. Further, in a state of being attached to the free arm 5, the upper surface of the free arm cover 6 is formed in a horizontal plane at the same height as the upper surface of the cloth base 2, the protrusion 3 of the cloth base 2, and the free arm 5. I have.

The free arm 5 has a tip surface
A resin decorative cover 10 whose upper surface is formed in a horizontal plane at the same height as the upper surface of the free arm 5 is screwed with screws 11, and each surface of the decorative cover 10 other than the upper surface is chamfered at a corner. ing. In order to screw the decorative cover 10, the decorative cover 10 has a through-hole 1 as a holding means in which an annular plate (not shown) is provided on the inner periphery on the distal end side.
The decorative cover 10 is held by the free arm 5 by screwing the screw 11 onto the distal end surface of the free arm 5 through the through hole 12. In addition, the decorative cover 10 is a free arm 5
In this state, the rear part of the through hole 12 in the axial direction behind the head of the screw 11 is kept in a gap state.

The cloth table 2 facing the free arm 5
On the side surface 3a of the protruding portion 3, a guide groove 13 for attaching and detaching the free arm that extends in the insertion / removal direction of the free arm cover 6, that is, in the horizontal direction from the tip of the protruding portion 3 is necessary for insertion / removal of the free arm cover 6. It is formed with an appropriate length. Further, the protruding portion 3 of the cloth base 2 and the free arm 5
In the vertical surface 2a of the cloth base 2 between the two, a retaining hole 14 having a gentle taper (not shown) is formed so that the sectional area becomes smaller toward the back.

On the other hand, when the free arm cover 6 is inserted into and removed from the free arm 5, the guide groove 13 of the projecting portion 3 is provided on the outer surface of one side 8 of the free arm cover 6.
A guide ridge 15 that fits relatively tightly and slidably is projected.

A tapered stopper 16 which fits into the stopper hole 14 of the cloth base 2 when the insertion of the free arm cover 6 is completed is provided on the distal end surface of one side 8 of the free arm cover 6. It is protruding. This stopper 16
The free arm cover 6 comes off the free arm 5 unless the free arm cover 6 is pulled out by applying a certain force to the free arm cover 6 because the free arm cover 6 is relatively tightly fitted by sliding contact of the tapered surface with the retaining hole 14. Will not be. Note that, instead of such a configuration, the retaining may be performed using the magnetic force of the magnet.

Further, on the front surface of the base 7 of the free arm cover 6, there is formed a guide projection 17 as a holding means of an appropriate length which fits into the through hole 12 forming the guide recess of the decorative cover 10. I have.

Next, the operation of the present invention having the above-described configuration will be described.

In order to sew the cuffs and the hem of the pants in the lock sewing machine according to the present invention, the free arm cover 6 is removed from the sewing machine body 1. Then, the tubular cloth to be sewn is wound around the outer circumference of the free arm 5 and the cloth is fed along the outer circumference of the free arm 5 to perform sewing. At this time, since there is no unevenness on the outer periphery of the free arm 5 such that the cloth to be fed is caught, the cloth feed during sewing becomes good.

Further, since the through holes 12, the guide grooves 13 and the retaining holes 14 on the side of the cloth base 2 are formed in inconspicuous places, even if the free arm cover 6 is removed from the sewing machine main body 1, the appearance is maintained. It doesn't get worse.

On the other hand, when ordinary straight stitching is performed, the guide ridge 15 of the free arm cover 6 is made to follow the guide groove 13 formed in the protrusion 3 of the cloth base 2 and
The guide projection 17 of the free arm cover 6 is inserted into the through hole 12 for screwing the decorative cover 10, and the free arm cover 6 is moved in a direction approaching the free arm 5. Then, the free arm cover 6 becomes the free arm 5
The stopper 16 is fitted into the stopper hole 14 of the cloth base 2 in a state in which the stopper 16 is completely mounted. And
In this state, not only the free arm cover 6 is simply attached to the free arm 5, but also the guide ridge 15 is fitted into the guide groove 13, and the guide projection 17 is inserted into the through hole 12. Since the stopper 16 is fitted in the retaining hole 14, it is possible to prevent a vertical step and rattling at the boundary between the free arm cover 6 and the cloth base 2 even by vibration during sewing. , And stable cloth feeding can be performed.

Further, a retaining member 16 and a retaining hole 14 are provided.
Is relatively strong using a tapered surface, so that there is no possibility that the free arm cover 6 may accidentally come off the free arm 5.

As described above, according to the present embodiment, it is possible to prevent a defective cloth feeding when the free arm cover 6 is removed and sewn, and to overcome the poor appearance of the free arm 5. Further, there is no possibility that the free arm cover 6 is accidentally pulled out of the free arm 4 due to vibration.

The present invention is not limited to the above embodiment, but can be modified as needed. For example, the sewing machine to which the present invention is applied is not limited to the lock sewing machine of the embodiment, but can be applied to various sewing machines. Further, in the embodiment, the guide concave portion on the distal end surface of the free arm has been described as a through-hole for screwing the decorative cover to the free arm. However, another configuration may be used. Further, in the above-described embodiment, the guide groove 13 is formed in the protruding portion 3, the through hole 12 is provided in the vicinity of the distal end surface of the free arm 5, and the guide is formed in the free arm cover 6 so as to fit in the through hole 12. Ridge 15 and protrusion 17
However, it is a matter of course that these may be mounted in reverse.

[0026]

[Effects of the Invention] As described above, according to the present invention, there is no uneven portion on the outer periphery of the free arm that hinders the cloth feeding.
Insufficient cloth feeding when sewing is performed by removing the free arm cover can be prevented, and since there is no concavo-convex portion in a conspicuous place, poor appearance of the free arm 5 can be overcome.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part showing an embodiment of a lock sewing machine to which a mounting structure of a free arm cover according to the present invention is applied.

FIG. 2 is a perspective view of a free arm showing a conventional free arm cover mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewing machine main body 2 Cloth base 3 Projection part 4 Gap 5 Free arm 6 Free arm cover 10 Makeup cover 12 Through hole (holding means) 13 Guide groove 14 Retaining hole 15 Guide ridge 16 Retaining tool 17 Guide projection (Retaining means) )

Claims (1)

(57) [Scope of request for utility model registration] 1. A free arm cover is provided on one side of a cloth base of a sewing machine body having a partial protrusion on one side thereof, and a free arm cover is detachably attached to the free arm. In the sewing machine which can be mounted on the free arm, a guide groove or a guide ridge for attaching / detaching the free arm cover is formed on a side surface of the protruding portion of the cloth base opposite to the side surface of the free arm and extends in a direction of inserting / removing the free arm cover. A holding means comprising a concave portion or a convex portion for holding a free arm cover is formed on the distal end surface of the free arm, and a guide projection slidably fitted to the guide groove or guide ridge on the free arm cover. A structure for mounting a free arm cover in a sewing machine, wherein a ridge or a guide groove, and a convex portion or a concave portion to be fitted to the holding means are respectively formed. .