Chuck mechanism and top jaw

1. A chuck mechanism comprising:

a chuck body including an installation surface and a side surface; and

a master jaw provided on the installation surface of the chuck body and configured to move in a radial direction of the chuck body, wherein a first marking is provided on the installation surface of the chuck body, the first marking is product information of the chuck mechanism, the product information of the first marking includes at least one of information representing a model number of the chuck mechanism and information representing a serial number of the chuck mechanism, the information representing the model number and the information representing the serial number include at least one of a letter and a number so that humans can understand at least one of the model number and the serial number when at least the one of the letter and the number is visually recognized by the humans, at least one second marking is provided on a peripheral side of the installation surface or the side surface of the chuck body, the at least one second marking is a two-dimensional code that does not include the letter and the number, and the second marking includes the same information as the product information of the first marking, wherein the installation surface of the chuck body is configured so that a jig for workpiece machining can be attached, an area of the installation surface of the chuck body that is processed when the jig for workpiece machining is attached to the installation surface of the chuck body is defined as a processed area, an area of the installation surface of the chuck body, excluding the processed area, is defined as a non-processed area, and the at least one second marking is provided on the non-processed area.

2. The chuck mechanism of claim 1 , further comprising:

a top jaw provided removably with the master jaw, wherein in a state that the top jaw is provided with the master jaw, an area, of the installation surface of the chuck body, facing the top jaw is defined as an opposing area, and an area, of the installation surface of the chuck body, excluding the opposing area is defined as the non-opposing area, the at least one second marking is provided on the non-opposing area.

3. The chuck mechanism of claim 1 , wherein the jig for workpiece machining has a hole, a fixed member provided on the installation surface of the chuck body is inserted into the hole, the processed area is the area, of the installation surface of the chuck body, having the hole arranged therein.

4. The chuck mechanism of claim 3 , wherein the jig for workpiece machining is a locator for workpiece positioning.

5. The chuck mechanism of claim 1 , wherein the information of the at least one second marking includes URL information that can access a web site showing the information of the second marking.

6. The chuck mechanism of claim 1 , further comprising:

a top jaw provided removably with the master jaw, wherein the at least one second marking includes a plurality of the second markings, and the second markings are provided on a side surface of the top jaw in addition to the installation surface or the side surface of the chuck body.

7. A top jaw provided removably with a master jaw provided on an installation surface of a chuck body of a chuck mechanism, the top jaw comprising:

a side surface;

a front surface;

a through-hole, for receiving a fixed member for attaching the top jaw to the master jaw, formed on the front surface; and

first and second markings provided on the side surface of the top jaw, wherein, when a processed area and a non-processed area are defined on the side surface of the top jaw, the non-processed area extends from an upper end position to a lower end position of a range in which the through-hole is arranged, the processed area is provided adjacent to the non-processed area and does not overlap with the through-hole when viewed from the side surface of the top jaw, the first marking is provided on the processed area, and the second marking is provided only on the non-processed area, the first marking includes product information representing a model number of the chuck mechanism or product information representing a model number of the top jaw, the information representing the model number includes at least one of a letter and a number so that humans can understand the model number when at least the one of the letter and the number is visually recognized by the humans, the at least one second marking is a two-dimensional code that does not include the letter and the number, and the second marking includes the same information as the product information of the first marking.