Sewing machine and method of controlling operation of the same

Abstract

A sewing machine is provided, which includes a table, support posts, upper and lower frames, a head unit, a bed unit, an X-axial head-unit-transport means and an X-axial bed-unit-transport means. An object is placed on the table. The support posts are provided on opposite sides of the table. The upper and lower frames connect the support posts to each other. The head unit is provided on the upper frame so as to be movable in an X-axis direction. The head unit has a head-unit-rotating means for rotating a sewing head. The bed unit is provided on the lower frame so as to be movable in the X-axis direction. The bed unit has a bed-unit-rotating means for rotating a sewing bed. The X-axial head-unit-transport means moves the head unit on the upper frame horizontally. The X-axial bed-unit-transport means moves the bed unit on the upper frame horizontally.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit under 35 U.S.C. 119(a) of Korean Patent Application Nos. 10-2010-0124830, filed on Dec. 8, 2010, 10-2011-0048013, filed on May 20, 2011, and 10-2011-0069518, filed on Jul. 13, 2011, the disclosure of each of which is incorporated by reference in its entirety for all purposes.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates generally to sewing machines and methods of controlling the operation of the sewing machines and, more particularly, to a sewing machine which is configured such that a sewing head rotates when an object, such as an airbag, a bag, a shoe, etc., is being sewn so that the sewing operation can be satisfactorily conducted without causing a hitch stitch, and in which a plurality of sewing heads may be arranged on a front surface of an upper beam in a row, so that not only the quality of the products can be enhanced but also the productivity can ...

AI Technical Summary

Benefits of technology

[0014]Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a sewing machine which can realize a perfect stitch over the entirety of an object even when sewing an object such as an airbag, a bag, a shoe, etc., that are thick materials and have sewing lines which are difficult to sew, thus markedly enhancing the quality of the product.

[0015]Another object of the present invention is to provide a sewing machine which can sew an object that has a large area to be sewn despite having a small size, thus minimizing the installation space of the sewing machine.

[0016]A further object of the present invention is to provide a sewing machine which uses a single power source to transport a head unit and a bed unit, so that the size and the production cost of the sewing machine can be reduced.

Problems solved by technology

Generally, objects, such as airbags, bags, shoes, etc., are made of comparatively thick materials and have many sewing lines, such as circular, curved, slanted lines, etc., which are difficult to sew.

Such hitch stitches make the entire stitch shape uneven, thus deteriorating the quality of the product.

Therefore, when the sewing machine forms a curved, circular or slanted stitch line, hitch stitches are caused in some sections.

Furthermore, the conventional sewing machine cannot process a comparatively large object because the sewing area of the sewing machine is restrictive.

However, if the size of the sewing machine increases, the space used to install the sewing machine must also be increased.

Thus, it takes too long to process a large number of objects.

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