Grinding machine

A grinding machine comprising:

• a grinding wheel that grinds a workpiece;
• a moving apparatus that relatively moves a position of the grinding wheel with respect to the workpiece;
• a proximity detector that outputs a proximity detection signal corresponding to a distance between the workpiece and the grinding wheel;
• a manual rotating handle provided with a rotation detector that outputs a rotation detection signal that is an electric signal corresponding to an amount of rotation resulting from an operator's manual operation;
• and
• a control apparatus that receives the rotation detection signal to control the moving apparatus by an amount corresponding to the rotation detection signal, wherein
• the manual rotating handle is provided with a rotational-torque varying apparatus that varies a rotational torque that is a torque needed to rotate the manual rotating handle, and
• the control apparatus receives the proximity detection signal to control the rotational-torque varying apparatus in accordance with a state of proximity between the workpiece and the grinding wheel based on the proximity detection signal,
• wherein the rotational-torque varying apparatus includes:
• a shaft integral member that rotates integrally with a handle shaft supported so as to be rotatable around a rotation axis of the manual rotating handle;
• and
• a pressing;
• member that is disposed so as to face the shaft integral member and that is pressed against the shaft integral member facing the pressing member, under a pressing force adjusted by a control signal from the control apparatus, and
• wherein the grinding machine includes an air regulating apparatus that enables adjustment of a flow rate of compressed air fed from an air source, and
• the control apparatus adjusts the flow rate of the compressed air from the air regulating apparatus to adjust the pressing force applied to the pressing member, in accordance with the state of proximity between the workpiece and the grinding wheel.

A grinding machine comprising:

• a grinding wheel that grinds a workpiece;
• a moving apparatus that relatively moves a position of the grinding wheel with respect to the workpiece;
• a proximity detector that outputs a proximity detection signal corresponding to a distance between the workpiece and the grinding wheel;
• a manual rotating handle provided with a rotation detector that outputs a rotation detection signal that is an electric signal corresponding to an amount of rotation resulting from an operator's manual operation;
• and
• a control apparatus that receives the rotation detection signal to control the moving apparatus by an amount corresponding to the rotation detection signal, wherein
• the manual rotating handle is provided with a rotational-torque varying apparatus that varies a rotational torque that is a torque needed to rotate the manual rotating handle, and
• the control apparatus receives the proximity detection signal to control the rotational-torque varying apparatus in accordance with a state of proximity between the workpiece and the grinding wheel based on the proximity detection signal,
• wherein upon determining the state of proximity between the workpiece and the grinding wheel based on the proximity detection signal is such that when the workpiece and the grinding wheel are in contact with each other, the control apparatus controls the rotational-torque varying apparatus such that the rotational torque of the manual rotating handle increases above the rotational torque exerted when the workpiece and the grinding wheel are not in contact with each other,
• wherein the rotational-torque varying apparatus includes:
• a handle shaft supported so as to be rotatable around a rotation axis of the manual rotating handle;
• and
• a pressing member that is disposed so as to face the handle shaft and that is pressed against the handle shaft facing the pressing member, under a pressing force adjusted control from the control apparatus,
• wherein the grinding machine includes an air regulating apparatus that enables adjustment of a flow rate of compressed air fed from an air source, and
• the control apparatus adjusts the flow rate of the compressed air from the air regulating apparatus to adjust the pressing force applied to the pressing member, in accordance with the state of proximity between the workpiece and the grinding wheel.

A grinding machine comprising:

• a grinding wheel that grinds a workpiece;
• a moving apparatus that relatively moves a position of the grinding wheel with respect to the workpiece;
• a proximity detector that outputs a proximity detection signal corresponding to a distance between the workpiece and the grinding wheel;
• a manual rotating handle provided with a rotation detector that outputs a rotation detection signal that is an electric signal corresponding to an amount of rotation resulting from an operator's manual operation;
• and
• a control apparatus that receives the rotation detection signal to control the moving apparatus by an amount corresponding to the rotation detection signal, wherein
• the manual rotating handle is provided with a rotational-torque varying apparatus that varies a rotational torque that is a torque needed to rotate the manual rotating handle, and
• the control apparatus receives the proximity detection signal to control the rotational-torque varying apparatus in accordance with a state of proximity between the workpiece and the grinding wheel based on the proximity detection signal,
• wherein upon determining the state of proximity between the workpiece and the grinding wheel based on the proximity detection signal is such that when the workpiece and the grinding wheel are in contact with each other, the control apparatus controls the rotational-torque varying apparatus such that the rotational torque of the manual rotating handle increases above the rotational torque exerted when the workpiece and the grinding wheel are not in contact with each other,
• wherein the torque varying apparatus includes:
• a shaft integral member that rotates integrally with a handle shaft supported so as to be rotatable around a rotation axis of the manual rotating handle;
• and
• a pressing member that is disposed so as to face the shaft integral member and that is pressed against the shaft integral member facing the pressing member, under a pressing force adjusted by a control signal from the control apparatus,
• wherein the grinding machine includes an air regulating apparatus that enables adjustment of a flow rate of compressed air fed from an air source, and
• the control apparatus adjusts the flow rate of the compressed air from the air regulating apparatus to adjust the pressing force applied to the pressing member, in accordance with the state of proximity between the workpiece and the grinding wheel.