Sewing machine

1. A sewing machine, comprising:

a presser foot that is configured to press a workpiece;

a presser bar that has a lower end allowing detachable attachment of the presser foot;

a presser bar vertically moving mechanism that moves the presser bar up and down;

a presser bar driver that drives the presser bar vertically moving mechanism;

a needle plate that has an upper surface, the upper surface being configured to receive the workpiece;

a projecting element that is detachably attached to the presser bar and that is driven up and down with the presser bar as the presser bar is driven up and down by the presser bar driver through the presser bar vertically moving mechanism, the projecting element being configured to form embosses on the workpiece by downwardly pressing the workpiece; and

a receiving section that is provided on the upper surface of the needle plate that opposes the projecting element to receive a tip of the projecting element.

2. The sewing machine according to claim 1 , wherein the receiving section comprises a buffer element made of a flexible material.

3. The sewing machine according to claim 1 , further comprising a specifier that specifies an amount of up and down movement of the presser bar, wherein the presser bar driver drives the presser bar vertically moving mechanism based on the amount of up and down movement specified by the specifier.

4. The sewing machine according to claim 1 , further comprising:

a needle that is configured to penetrate the workpiece;

a needle bar that has a lower end allowing detachable attachment of the needle;

a needle bar vertically moving mechanism that moves the needle bar up and down;

a needle bar driver that drives the needle bar vertically moving mechanism; and

a controller that selectively drives either the presser bar driver to drive the presser bar vertically moving mechanism or the needle bar driver to drive the needle bar vertically moving mechanism.

5. The sewing machine according to claim 4 , further comprising a transfer device that is configured to transfer the workpiece in a front and rear direction represented as a Y direction and a left and right direction represented as an X direction orthogonal to the Y direction,

wherein the controller is configured to execute transfer of the workpiece by the transfer device at least in either of the X direction and the Y direction in coordination with the up and down movement of the presser bar by the presser bar driver.

6. The sewing machine according to claim 5 , further comprising a storage that stores embossing data and holing data, the embossing data providing a mapping between a transferred position of the workpiece to be transferred by the transfer device and a lowered position of the presser bar to be lowered by the presser bar driver, and the holing data providing a mapping between the transferred position of the workpiece to be transferred by the transfer device and a lowered position of the needle bar to be lowered by the needle bar driver,

wherein the controller is configured to execute formation of holes on the workpiece by the needle based on the holing data after executing formation of embosses on the workpiece by the projecting element based on the embossing data.

7. The sewing machine according to claim 6 , wherein the controller is configured to execute formation of the holes on an entire range of the workpiece based on the holing data after formation of the embosses on the entire range of the workpiece based on the embossing data.

8. The sewing machine according to claim 6 , wherein the controller is configured to divide the workpiece into a plurality of sections, and formation of the embosses on the workpiece based on the embossing data and formation of the holes on the workpiece based on the holing data are configured to be executed section by section.