Abstract: A sewing machine includes a needle bar to which an engraving needle is attached and is capable of executing an engraving process of forming an engraved pattern on a workpiece. The sewing machine further includes a heightwise position adjusting mechanism adjusting a mounting heightwise position of the engraving needle relative to the needle bar, a unit imaging the engraved marks formed on the workpiece by the engraving needle, thereby obtaining an image of each engraved mark, a detection unit extracting a region of each engraved mark from the image to detect a size of each engraved mark, a determination unit comparing the size of each engraved mark with a reference value stored, determining a mounting heightwise position of the engraving needle, and a unit informing of information for adjusting the mounting heightwise position of the engraving needle according to determination made by the determination unit.

Abstract: A punch needle is disclosed. The punch needle is detachably attached to a needle bar of a sewing machine and is configured to punch a workpiece by moving the needle bar up and down. The punch needle including a base section detachably attached to the needle bar; a mid section in continuation with the base section; a tip section formed on the end of the mid section; and a handle provided on the mid section, the handle being configured to be held by a user's fingers during attachment/detachment of the base section to/from the needle bar.

Abstract: A bobbin detachably installed into an inner hook of a sewing machine is disclosed. The bobbin includes a bobbin shaft; and a pair of flanges that are provided at both axial ends of the bobbin shaft. The bobbin shaft is cylindrical and includes a first opening and a second opening defined on axial ends thereof, the bobbin shaft being provided with a restriction member in a proximity of either of the first and the second opening to allow attachment of the bobbin to the inner hook through the first opening.

Abstract: An engraving needle holder is disclosed which mounts an engraving needle to a needle bar when an engraving process is executed for a workpiece by moving the engraving needle upward and downward by making use of drive of the needle bar provided on a sewing machine. The engraving needle holder includes a mounted part which is mountable to a fixing part of a lower end of the needle bar into which a handle of the needle is inserted to be fixed, with the needle being removed, a supporting member located at a lower end side of the mounting part so that a base of the engraving needle is mounted to it so as to be positionally adjustable, and an adjusting mechanism which adjusts a mounting height position of the engraving needle relative to the supporting member.

Abstract: A sewing machine includes a needle bar to which an engraving needle is attached and is capable of executing an engraving process of forming an engraved pattern on a workpiece. The sewing machine further includes a heightwise position adjusting mechanism adjusting a mounting heightwise position of the engraving needle relative to the needle bar, a unit imaging the engraved marks formed on the workpiece by the engraving needle, thereby obtaining an image of each engraved mark, a detection unit extracting a region of each engraved mark from the image to detect a size of each engraved mark, a determination unit comparing the size of each engraved mark with a reference value stored, determining a mounting heightwise position of the engraving needle, and a unit informing of information for adjusting the mounting heightwise position of the engraving needle according to determination made by the determination unit.