JP2000354695A - Sewing-machine frame and its assembling tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce time and effort for machining and weight and to enable a highly accurate and highly rigid constitution. SOLUTION: In a sewing machine frame 1 provided with both a horizontally extended upper frame 3 with a mounting surface 11a for mounting sewing- machine heads 5 and a horizontally extended lower frame 4 with a mounting surface 11a for mounting beds 6, a pair of horizontally extended mounting bars 7 of high rigidity are mounted to each of the mounting surfaces 11a, and the sewing-machine heads 5 or the beds 6 are mounted to the flatly machined surfaces of the mounting bars 7. The rigidity of the mounting bar 7 is relatively heightened more than that of the mounting surface 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine frame and an assembly thereof.

[0002]

2. Description of the Related Art FIG. 8 shows a conventional sewing machine frame. This sewing machine frame 50 has a pair of support plates 51 which stand on the floor at an interval on the left and right, and is mounted on a high portion of both support plates 51. An upper frame 52 for attaching a sewing machine head 54 fixed in a state of being bridged, and a lower frame 53 for attaching a bed 55 fixed in a state of being bridged between the middle and high portions of both support plates 51. And Each of the frames 52 and 53 is made of a steel material having a substantially U-shaped cross section.

[0003] A sewing machine head 54 is provided on a sewing machine frame 50.
Since it is necessary to position and mount the bed 55 with relatively high precision, after the assembly of the sewing machine frame 50, the sewing machine head mounting surface 52a of the upper frame 52 and the bed mounting surface 53a of the lower frame 53 are accurately positioned. The surface is processed.

[0004]

However, since it is necessary to process the assembled sewing machine frame 50,
There are the following problems: (A) A large-sized processing device must be prepared, resulting in high equipment costs. (B) It takes time to attach and remove the sewing machine frame 50 to and from the processing device.

[0005] Further, when the machine head mounting surface 52a of the upper frame 52 and the bed mounting surface 53a of the lower frame 53 are flat-worked, there is a problem that the machined surface becomes thinner and its rigidity is reduced. If the thicknesses of the upper frame 52 and the lower frame 53 are increased for this measure, a problem arises in that the weight of the sewing machine frame 50 increases.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a sewing machine frame which can be constructed with high precision and high rigidity while reducing labor and weight of processing, and an assembly tool thereof.

[0007]

In order to achieve the above object, a sewing machine frame according to the present invention is provided with a sewing machine frame provided with a horizontal frame extending left and right having a mounting surface for mounting a sewing head or a bed. A left and right mounting bar with high rigidity is attached to the surface, and the sewing head or the bed is attached to a plane processed surface of the mounting bar.

The mounting bar is not particularly limited, and examples thereof include a solid bar, a hollow bar, a U-shaped cross section, and an H-shaped cross section.

Although not particularly limited, the rigidity of the mounting bar can be made relatively higher than the rigidity of the mounting surface of the horizontal frame. Specifically, the following embodiments can be exemplified.

(1) The rigidity of the mounting bar is formed by forming the mounting surface on a plate-like portion having a predetermined thickness of the horizontal frame and making the thickness of the mounting bar larger than the thickness of the plate-like portion. Is relatively high. Although not particularly limited, it is preferable to make the thickness of the mounting bar 30% or more larger than the thickness of the plate-shaped portion. Here, "the thickness of the mounting bar"
Means the length of the mounting bar in the direction perpendicular to the mounting surface.

(2) A mode in which the rigidity of the mounting bar is relatively increased by forming the mounting bar with a material having a higher strength than the material of the mounting surface of the horizontal frame.

(3) An embodiment in which the above (1) and (2) are combined.

[0013] In addition, the present invention provides an assembling tool for a sewing machine frame, comprising: an upper frame as the horizontal frame for attaching the sewing machine head; and a lower frame as the horizontal frame for attaching the bed. An assembly tool for attaching the mounting bar to the upper frame, the upper frame positioning portion for positioning the mounting bar to be attached to the upper frame, and a lower portion for positioning the attachment bar to be attached to the lower frame. A positioning portion for a frame, wherein the mounting bars can be mounted on the upper frame and the lower frame in a state where the mounting bars are relatively positioned.

[0014]

1 to 3 show a sewing machine frame 1 of a two-head sewing machine according to an embodiment of the present invention and an assembly tool 20 thereof. As shown in FIG. 1, the sewing machine frame 1 includes a pair of support plates 2 that stand on the floor at an interval on the left and right, and an upper frame 3 fixed in a state of being bridged over a high portion of the support plates 2. And a lower frame 4 fixed in a state of being bridged between the middle and high portions of the support plates 2. A mounting bar 7 extending left and right is attached to the upper frame 3 and the lower frame 4, and the sewing machine head 5 and the bed 6 are respectively mounted via the mounting bar 7.

The upper frame 3 and the lower frame 4 each have a plate-like portion 11 having a predetermined thickness and an outer surface serving as a mounting surface 11a of the mounting bar 7.
And a pair of side walls 12 erected at the end of the plate-shaped portion 11, and is formed in a substantially U-shaped cross section. Further, lips 12a extending in a direction to close the groove openings are formed on both side walls 12 of the upper frame 3 on the side of the groove openings, respectively. Lip 12a on the lower frame 4
Can be provided. ). The plate-shaped portion 11 is provided with a plurality of mounting holes 11 b for mounting the mounting bar 7.

The upper frame 3 is provided with a mounting surface 11
The support bar 2 is attached to the support plate 2 with its a facing forward, and a pair of upper and lower attachment bars 7 extending left and right is attached to the attachment surface 11a.

The rigidity of the mounting bar 7 is higher than the rigidity of the mounting surface 11a of the upper frame 3. Specifically, the thickness of the mounting bar 7 is made larger than the thickness of the plate-shaped portion 11 (for example, the thickness of the plate-shaped portion 11 is set to 4.
5 mm, and the thickness of the mounting bar 7 is 6 to 9 mm. ). The mounting bar 7 has a rear surface 7d (a surface that abuts against the mounting surface 11a) and a front surface 7e on the opposite side are machined with high precision in a plane and parallel. The front surface 7e of the mounting bar 7 is the “plane of the mounting bar 7 that has been flattened”.

The rear surface 7d of the mounting bar 7 is provided with a female screw hole 7a for attaching the mounting bar 7 to the mounting surface 11a, and the bolt 15 is inserted through the mounting hole 11b of the plate portion 11.
It is fixed at. By attaching this mounting bar 7, the rigidity of the upper frame 3 is increased. A female screw hole 7b for fixing the sewing machine head 5 with a bolt 16 and a female screw hole 7c for mounting an assembly tool 20 described later with a bolt 21 are provided on the front surface 7e of the mounting bar 7.
Are provided. Note that the female screw hole 7c may be omitted, and the mounting bar 7 may be mounted on the assembly tool 20 by the female screw hole 7b.

The lower frame 4 is mounted on the mounting surface 11 of the plate-shaped portion 11.
a is mounted on the support plate 2 with its a facing upward, and a pair of mounting bars 7 configured and processed in the same manner as the upper frame 3 are disposed on the mounting surface 11 a in the same manner as the upper frame 3. .

When assembling the sewing machine frame 1, an assembling tool 20 shown in FIG. 3 is used. This assembly tool 20
Are provided so as to join the vertical plate-shaped upper frame positioning portion 23, the horizontal plate-shaped lower frame positioning portion 24, and the front surface of the upper frame positioning portion 23 and the upper surface of the lower frame positioning portion 24. And an inclined member 25 for reinforcement. The mounting bar 7 fixed to the upper frame 3 is mounted on the rear surface of the positioning portion 23 for the upper frame, and the mounting bar 7 fixed to the lower frame 4 is mounted on the lower surface of the positioning portion 24 for the lower frame. Thus, the assembly tool 20
Each of the mounting bars 7 mounted on the upper frame 3 is relatively accurately positioned between a position where the mounting bar 7 is mounted on the upper frame 3 and a position where the mounting bar 7 is mounted on the lower frame 4. Then, the respective mounting bars 7 can be fixed to the upper frame 3 and the lower frame 4 in such a state of being positioned.

Next, a method of assembling the sewing machine frame 1 will be described in order. (1) As shown in FIG. 3, the upper frame 3 and the lower frame 4 are fixed to the left and right support plates 2 by welding, respectively, with the upper frame 3 and the lower frame 4 being bridged therebetween. The mounting surfaces 11a of the upper frame 3 and the lower frame 4 are not flattened,
a may be slightly wavy, twisted, or the like.

(2) As shown in FIG. 3, the mounting bar 7 fixed to the upper frame 3 and the mounting bar 7 fixed to the lower frame 4 are mounted to the assembly tool 20 with bolts 21. The mounting bar 7 has a surface 7d that abuts against the mounting surface 11a and a surface 7e on the opposite side are machined with high precision in a plane and parallel manner.

(3) Each of the mounting bars 7 relatively positioned by the assembly tool 20 is positioned on the mounting surface of the upper frame 3 and the lower frame 4, respectively.
The bolts 1 are attached to the upper frame 3 and the lower frame 4 as shown in
When the mounting bar 7 is fixed at 5, the sewing machine frame 1 is completed.

As described above, since the rigidity of the mounting bar 7 is higher than the rigidity of the mounting surface 11a of the upper frame 3 and the lower frame 4, in the above (3), the mounting surface 11a is The mounting bar 7 is deformed in the direction of flattening following the flattened surface 7d of the mounting bar 7 which comes into contact with the mounting bar 7.
On the other hand, the mounting bar 7 is not deformed, and the surface 7d in contact with the mounting surface 11a and the surface 7e on the opposite side (the surface on which the sewing head 5 or the bed 6 is mounted) maintain a flat and parallel state with high precision. . That is, when the attachment bar 7 is formed with high precision, the sewing machine frame 1 can be configured with high precision.

According to the sewing machine frame 1 configured as described above, since the mounting bar 7 is attached to the upper frame 3 and the lower frame 4, the rigidity of the upper frame 3 and the lower frame 4 can be increased. . By doing so, it is possible to suppress an increase in the weight of the sewing machine frame 1 as compared with the related art in which the rigidity is increased by increasing the overall thickness of the upper frame 3 or the lower frame 4.

Further, the mounting surface 11a is formed on the plate-like portion 11 having a predetermined thickness of the upper frame 3 and the lower frame 4, and the plate-like portion 1 is formed.
By making the thickness of the mounting bar 7 larger than the plate thickness of 1, the rigidity of the mounting bar 7 is made relatively higher than the rigidity of the mounting surface 11a of the upper frame 3 or the lower frame 4.
For this reason, the mounting bar 7 is attached to the upper frame 3 and the lower frame 4.
When mounting is performed, the mounting surface 11a is
The mounting bar 7 and the plate-like portion 11 are integrated with each other, and the rigidity of the upper frame 3 and the lower frame 4 is increased.

On the other hand, since the mounting bar 7 does not deform,
If the mounting bar 7 is formed with high precision, the sewing machine frame 1 can be configured with high precision. For this reason, the processing time and labor can be reduced as compared with the related art in which the entire mounting surface 11a of the upper frame 3 or the lower frame 4 is flat processed with high precision.

Further, according to the assembling tool 20 of the sewing machine frame 1 of the present invention, each mounting bar 7 is connected to the upper frame 3 respectively.
Since it can be attached to the lower frame 4 with high precision, the sewing machine frame 1 configured with high precision can be easily assembled. In addition, unlike the conventional method in which the mounting surfaces 52a and 53a of the upper frame 52 and the lower frame 53 are planarized after the assembly of the sewing machine frame 50, the mounting bar 7 is first processed with high precision, and then the mounting bar 7 is processed.
Are attached to the sewing machine frame 1 in this order. For this reason, since the attachment bar 7 before attaching to the sewing machine frame 1 may be machined, a large-sized machining device is not required, and the attachment and detachment of the attachment bar 7 to and from the machining device can be easily performed. Therefore, the processing time of the sewing machine frame 1 can be significantly reduced as compared with the related art.

It should be noted that the present invention is not limited to the configuration of the above-described embodiment, but may be embodied by appropriately changing the scope of the invention as follows, for example, as follows. (1) As shown in FIG. 4, the lower frame 4 is provided with the mounting surface 11a facing forward, and the bed 6 is mounted via the mounting bar 7 on the front side of the mounting surface 11a. For example, FIG. 5 shows a sewing machine frame configured such that the mounting surfaces 11a of the upper frame 3 and the lower frame 4 are located at the same position when viewed from above, and mounting bars are provided on the upper frame 3 and the lower frame 4 of the sewing machine frame. When attaching 7, the assembly tool 30 shown in FIG. 5 is used. In this assembling tool 30, the mounting surface 1 of the upper frame 3 and the lower frame 4
1a, the upper frame positioning portion 2
3 and the lower frame positioning portion 24 are configured to be flush.

(2) As shown in FIG. 6, the mounting bar 33 is formed in a substantially U-shaped cross section with a lip 33a.
The bolt 34 is slidably provided in the length direction of the mounting bar 33 so that the head 34a of the bolt 34 is fitted to the lip 33a. The mounting bar 33 includes a bolt 34
The male screw 34b is inserted into the mounting hole 11b and fixed with the nut 35. With this configuration, the position of the mounting bar 33 in the left-right direction with respect to the upper frame 3 or the lower frame 4 can be easily adjusted.

(3) As shown in FIG. 7, the upper frame 3 or the lower frame 4 is formed in a cylindrical shape. At this time, a mode in which a hole 38 for mounting the bolt 15 for fixing the mounting bar 7 is provided on the rear surface of the upper frame 3 or the lower frame 4 can be exemplified.

(4) After the mounting bar 7 is mounted on the upper frame 3 or the lower frame 4, the surface 7e of the mounting bar 7 on which the sewing machine head or the bed is mounted is flattened. In this case, the surface 7e on which the sewing machine head or the bed is mounted need not be flattened before the mounting bar 7 is mounted.

(5) The right and left ends of the mounting bar 7 are fixed to the support plate 2 respectively. (6) Use for a single-head sewing machine or a multi-head sewing machine with three or more heads.

(7) Bars fixed in a state of being bridged over a pair of mounting bars 7 fixed to each mounting surface 11a are provided.

(8) After attaching the mounting bar 7 to the upper frame 3 and the lower frame 4, the assembly tool 20 is used as the frame material of the sewing machine frame 1 without being removed from the mounting bar 7.

(9) By forming the mounting bar 7 with a material having a higher strength than the material of the mounting surface 11a of the upper frame 3 or the lower frame 4, the rigidity of the mounting surface 11a of the upper frame 3 or the lower frame 4 can be reduced. Relatively increase the rigidity of the mounting bar 7.

(10) The rigidity of the mounting surface 11a of the upper frame 3 or the lower frame 4 should be equal to or relatively higher than the rigidity of the mounting bar 7.

[0038]

As described in detail above, according to the sewing machine frame according to the first to fourth aspects of the present invention, it is possible to reduce the labor and weight of machining and to achieve high precision and high rigidity. It has the effect.

In addition to the above effects, according to the assembling tool for a sewing machine frame according to the fifth aspect of the present invention, a sewing machine frame configured with high accuracy can be easily assembled.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a sewing machine provided with a sewing machine frame according to an embodiment of the present invention.

FIG. 2 is a left side sectional view of the sewing machine frame.

FIG. 3 is an exploded perspective view of the sewing machine frame.

FIG. 4 is a left side sectional view showing a modified example of the sewing machine frame of the embodiment embodying the present invention.

FIG. 5 is an exploded perspective view of the sewing machine frame.

FIG. 6 is a diagram showing another modified example of the sewing machine frame.

FIG. 7 is a diagram showing another modified example of the sewing machine frame.

FIG. 8 is a perspective view showing a sewing machine provided with a conventional sewing machine frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewing machine frame 2 Support plate 3 Upper frame 4 Lower frame 5 Sewing head 6 Bed 7 Mounting bar 7e Plane processed surface 11a Mounting surface 20 Assembly tool 23 Upper frame positioning part 24 Lower frame positioning part 30 Assembly tool 33 Mounting bar

Claims (5)

[Claims] 1. A sewing machine frame having a horizontal frame extending left and right having a mounting surface for mounting a sewing machine head or a bed, a mounting bar extending left and right is mounted on the mounting surface, and the mounting bar is flattened. A sewing machine frame, wherein the sewing machine head or the bed is attached to a surface. 2. The rigidity of the mounting surface of the horizontal frame is
The sewing machine frame according to claim 1, wherein the rigidity of the mounting bar is relatively increased. 3. The rigidity of the mounting bar is formed by forming the mounting surface on a plate-like portion having a predetermined thickness of the horizontal frame, and making the thickness of the mounting bar larger than the thickness of the plate-like portion. 3. The sewing machine frame according to claim 2, which is relatively high. 4. The sewing machine frame according to claim 2, wherein the rigidity of the mounting bar is relatively increased by forming the mounting bar with a material having a higher strength than the material of the mounting surface of the horizontal frame. 5. A machine for attaching the mounting bar to a sewing machine frame having an upper frame as the horizontal frame for attaching the sewing machine head and a lower frame as the horizontal frame for attaching the bed. An assembly tool, comprising: an upper frame positioning portion that positions the mounting bar to be attached to the upper frame; and a lower frame positioning portion that positions the mounting bar to be attached to the lower frame. The assembly tool for a sewing machine frame according to any one of claims 1 to 4, wherein the mounting bar is configured to be attachable to the upper frame and the lower frame in a state where the mounting bar is relatively positioned.