Patent Application
20050178308
The present invention relates to a sewing machine body composed of three parts and each part includes a stress-resistant space so as to obtain a light in weight and strong sewing machine body.
A conventional sewing machine body is made by way of iron casting which is heavy. The body is bulky and has a rough surface condition which does not meet the required specification and configuration. Therefore, further processes of machining and surface treatment are required to the body and this takes a lot of labor and time. Aluminum casting is developed to manufacture the sewing machine body within the past thirty years and may obtain a light in weight body. Nevertheless, the cost of the material and the molds is so high that cuts the benefits of the manufacturers.
The latest method for making the sewing machine body is to made an integral body composed of the base, the upright part and the arm from a single plate. The parts of the transmission mechanism in the sewing machine body are supported by flanges in the integral body. The support to the parts is not strong enough to bear the severe vibration and the actions of the moving parts, especially to the transverse force applied to the flanges. The flanges will be bent or deformed by the frequent impact forces coming from the moving parts and the deformation of the flanges affects the position of the needle bar. This results in abnormal impact between the needle bar and the shuttle of the mechanism so that the result of the sewing cannot be satisfied. Besides, the bending and/or deformation of a large-area pressing to a metal plate are difficult to control. In order to obtain a better result, especially for the periphery of the plate and the depth of the base, the pressing actions have to be taken several times.
The present invention intends to provide a sewing machine body that is composed of three individual parts connected with each other by welding connection plates therebetween so as to have a light and strong sewing machine body.
The present invention relates to a sewing machine body which comprises a first part used as a base, a second part used as an upright part connected to an end of the first part, and a third part used as an arm which is connected to the distal end of the second part. Four connection plates are respectively welded between the third part and the second part, and between the first part and the second part. Each of the first part, the second part and the third part includes a hollow interior.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.
Referring to FIGS. 1 to 3, the sewing machine body 10 of the present invention comprises a main frame 20 which is composed of a framework 200 composed of a first part 21, a second part 22 and a third part 23. Each of the three parts 21, 22 and 23 has a hollow interior 201 defined therein so as to reduce the total weight of the frame 20. A plurality of connection plates 30 are used to connect the first part 21 and the second part 22, and the second part 22 and the third part 23 as shown in
The first part 21 which is the longest one of the three parts and is received in a base 11 of the sewing machine body 10. The second part 22 which is the shortest one of the three parts and is received in the upright part 12 which is connected to a top of an end of the first part 21. The third part 23 is then connected to a distal end of the second part 22 and received in the arm 13 of the sewing machine body 10. The three parts 21, 22 and 23 can be connected with each other by welding or bolts. In this embodiment, four connection plates 30 are welded to respective sides of each of the three parts 21, 22, and 23 as shown in
As shown in
The main frame 20 is manufactured by the individual parts 21, 22 and 23 which are easily made in the factory and the interior space 201 in each of the parts 21, 22, 23 effectively reduces the weight of the parts 21, 22, 23. The cost for manufacturing the parts 21, 22, 23 is obviously much less than the conventional methods. Besides, the parts 21, 22, 23 do not need surface treatment and extra machining and they can be connected with each other within a short period of time. The three parts 21, 22, 23 has excellent structural strength which is strong enough to bear the force that applied to the main frame 20.
While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
