JP3847355B2 - Machine frame - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a machine frame of a sewing machine.
[0002]
[Prior art]
Conventionally, a sewing machine has used a casting for a machine frame including an arm that holds an upper shaft and a head, and a support that supports the arm and accommodates a sewing machine driving device such as a motor and a timing belt.
[0003]
However, castings have poor productivity, are heavy, difficult to process, and have a poor appearance and require surface treatment, which requires man-hours. For this reason, in the technology disclosed in Japanese Utility Model Publication No. 63-21258, the arm, the support column, and the bed are each composed of an aluminum extruded product and fastened.
[0004]
[Problems to be solved by the invention]
In the above-described conventional technology, the above-described problem in the case of molding with a casting is solved by molding and fastening the arm and the column with an aluminum extrusion-molded product.
[0005]
By the way, in a sewing machine, retrofitting parts such as a wiper device for pulling the upper thread after automatic thread trimming onto the cloth and accessory storage boxes such as needles and scissors may be attached or removed depending on the specifications. In many cases, when attaching the above-mentioned retrofitting parts to the sewing machine frame disclosed in Japanese Utility Model Publication No. 63-21258, processing for providing a through-hole that allows a bolt for mounting to pass through the sewing machine frame. It is necessary to apply.
[0006]
For this reason, it takes time to set the processing position of the through hole in mounting of a component that requires high accuracy in the mounting position, such as the wiper device described above. Furthermore, after the removal of the retrofitted parts becomes unnecessary, the through hole remains open, so that the appearance is inferior.
[0007]
It is a technical object of the present invention to provide a machine frame of a sewing machine that can easily attach, remove, and highly accurately position a retrofitting component and that does not deteriorate in appearance even after the removal.
[0008]
[Means for Solving the Problems]
In order to solve the above technical problem, the technical means taken in the invention of claim 1 is a machine frame of a sewing machine formed by assembling an arm , a strut and a bed, and an outer peripheral surface of the arm and the strut. The longitudinal grooves are formed before assembly, and after the assembly, each of the grooves constitutes a locking groove.
[0009]
The technical means taken in the invention of claim 2 is that each groove of the technical means taken in the invention of claim 1 described above is a T groove having a substantially T-shaped cross section.
[0010]
In order to improve productivity, reduce weight, improve the appearance, eliminate the need for surface treatment, and facilitate processing, the technical means taken in the invention of claim 3 is that the machine frame and the column are extruded with aluminum. It is a molded product.
[0011]
[Action]
In the first aspect of the present invention, since the locking groove is formed in the longitudinal direction on the outer surface of the machine frame, it can be easily attached and detached by locking the retrofitted part to the locking groove. Further, before the retrofitting component is fixed to the machine frame, it can be freely moved in the longitudinal direction of the machine frame, so that even a component requiring high accuracy can be easily positioned. Furthermore, attachment can be performed without providing an attachment hole.
[0012]
In the invention of claim 2, if the nut is movably fitted into the T-groove in advance, and the retrofitted parts can be fixed by tightening with the bolt and nut, the bolt can be loosened to easily attach and remove. be able to. In addition, since it can be freely moved in the longitudinal direction of the machine frame before the bolt is tightened, it is possible to easily perform positioning even for parts that require high accuracy. Furthermore, attachment can be performed without providing an attachment hole.
[0013]
In the invention of claim 3, since the machine frame and the column are made of an aluminum extrusion molded product, it is possible to improve the productivity, reduce the weight, make the surface treatment unnecessary by improving the appearance, and further facilitate the processing. Yes [0014]
【Example】
An embodiment according to the present invention will be described with reference to the drawings.
[0015]
FIG. 1 is an external perspective view of a sewing machine employing the sewing machine frame of this embodiment, and FIG. 2 is an exploded view of the sewing machine frame of this embodiment. In the figure, the sewing machine arm is composed of a first machine casing 10, and the column is composed of a second machine casing 20. The first machine frame 10 and the second machine frame 20 are made of an aluminum extrusion-molded product, and are further provided with T grooves 11 and 21 which are locking grooves in the longitudinal direction of the machine frame. For this reason, it is possible to improve the productivity, reduce the weight, make the surface treatment unnecessary by improving the appearance, and further facilitate the processing.
[0016]
In order to attach the wiper device for pulling up the upper thread after automatic thread trimming onto the cloth and the accessory part 40 such as an accessory storage box such as a needle and scissors to the T grooves 11, 21, Is inserted into the nut 41, and the bolts 42 and the nut 41 are used to hold and fix the retrofitting component 40. Then, when high accuracy is required for the position of the retrofit component 40, the position of the retrofit component 40 may be adjusted before the bolt 42 is tightened.
[0017]
One end surface of the first machine casing 10 is fixed to the outer surface of the second apparatus casing 20, and a sewing head 30 indicated by a two-dot chain line is fixed to the other end surface. The first machine casing 10 is fixed to the outer surface of the second machine casing 20 as described above, but high strength is required to hold the first machine casing 10 at the attachment portion. For this reason, mounting holes 12 and 22 are formed in the end surface of the first machine frame 10 and the outer surface of the second machine frame 20 and fastened with bolts (not shown), and the L-shaped joint 13 is the same as the post-installation component 40. The first and second machine casings 10 and 20 are attached to the outer surfaces by a fixing method. On the other hand, the sewing head 30 is fixed to a mounting hole (not shown) provided on the other end surface of the first machine casing 10 with a bolt.
[0018]
The second machine casing 20 is fixed to a sewing machine bed 31 whose lower end surface is indicated by a two-dot chain line, and a cover 32 is attached to the upper end surface. The second machine casing 20 is fixed to the sewing machine bed 31 as described above, but this attachment structure is the same as the attachment structure of the first machine casing 10 and the sewing machine head 31. The second machine casing 20 is provided with a hole 23 through which the upper shaft of the sewing machine (not shown) passes, and a bearing member 24 that holds the upper shaft is structured on the outer surface of the second machine casing 20 in the same manner as the retrofitting component 40. It is attached with. Here, 25 is a nut, and 26 is a bolt.
[0019]
In the present embodiment, the rear part 40 can be fastened together with the bolt 42 and fixed by the nut 41 movably fitted in the T grooves 11 and 21 in advance, so that it can be easily attached by loosening the bolt 42. And can be removed.
[0020]
In this embodiment, the retrofitting part 40 can be freely moved in the longitudinal direction of the machine casings 10 and 20 before the bolt 42 is tightened, so that even parts requiring high accuracy can be positioned easily. be able to.
[0021]
Further, in the present embodiment, since the attachment can be performed without providing an attachment hole, the appearance does not deteriorate even after the retrofitting component 40 is removed.
[0022]
In the above-described embodiment, the T grooves 11 and 21 are employed as the locking grooves, but the present invention is not particularly limited to this shape. Further, as shown in the present embodiment, in addition to the retrofitting part 40, the L-shaped joint 13 and the bearing member 24 can be easily positioned and attached. In the above-described embodiment, as shown in FIG. 1, an accessory storage box is used as the retrofitting part 40, but the present invention is not limited to this.
[0023]
【The invention's effect】
According to the first aspect of the present invention, the attachment and removal can be easily performed by locking the retrofitted component in the locking groove. Further, before the retrofitting component is fixed to the machine frame, it can be freely moved in the longitudinal direction of the machine frame, so that even a component requiring high accuracy can be easily positioned. Furthermore, since the attachment can be performed without providing a hole for attachment, the appearance does not deteriorate even after the retrofitted parts are removed. Further, it is desirable that the accessory storage box such as a needle and scissors can be changed in position according to convenience, and can be easily moved in the present invention.
[0024]
In the invention of claim 2, if the nut is movably fitted into the T-groove in advance, and the retrofitted parts can be fixed by tightening with the bolt and nut, the bolt can be loosened to easily attach and remove. be able to. In addition, since it can be freely moved in the longitudinal direction of the machine frame before the bolt is tightened, it is possible to easily perform positioning even for parts that require high accuracy. Furthermore, since the attachment can be performed without providing a hole for attachment, the appearance does not deteriorate even after the retrofitted parts are removed.
[0025]
In the invention of claim 3, since the machine frame and the column are made of an aluminum extrusion molded product, it is possible to improve the productivity, reduce the weight, make the surface treatment unnecessary by improving the appearance, and further facilitate the processing. it can.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a sewing machine that employs a machine frame of the sewing machine according to the present invention.
FIG. 2 shows an exploded view of the machine frame of the sewing machine according to the present invention.
[Explanation of symbols]
10 ... 1st machine frame (sewing machine arm)
11 ... T groove (locking groove)
20 ... Second machine frame (support)
21 ... T groove (locking groove)
40 ... Retrofit parts

Claims (3)

In the machine frame of the sewing machine formed by assembling the arm , strut and bed , longitudinal grooves are formed on the outer peripheral surface of the arm and strut before assembling. After assembling, the grooves are locked. A machine frame of a sewing machine , characterized by forming a groove . The machine frame of a sewing machine according to claim 1 , wherein each of the grooves is a T-groove having a substantially T-shaped cross section. The machine frame of a sewing machine according to claim 1 or 2, wherein the arm and the support column are aluminum extrusion molded products.

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