Machine tool with time control device

Claim 2

A machine tool for performing a predetermined machining cycle comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means for effecting relative movement between said work support and said tool support; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting at least one check point during a machining cycle; detecting means for detecting a difference between a predetermined machining cycle and an actual machining cycle at said check point; feed compensating means for compensating for a speed of relative movement between said work support and said tool support; and control means responsive to said detecting means to compensate for a difference between said predetermined machining cycle and an actual machining cycle.

Claim 3

A machine tool for performing a predetermined machining cycle comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting relative movement between said work support and said tool support; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting at least one check point during a machining cycle; switch means adapted to be actuated at said check point when an actual machining is occurring at a predetermined machining cycle; control means operable for exhausting fluid from one side of said cylinder to change the speed of relative movement between said work support and said tool support upon actuation of said second timer means and non-actuation of said switch means at said check point, said control means being made inoperative upon actuation of said switch means.

Claim 4

A machine tool for performing a predetermined machining cycle comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting relative movement between said work support and said tool support; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting at least one check point during a machining cycle; switch means adapted to be actuated at said check point when an actual machining is occurring at a predetermined machining cycle; control means operable for exhausting fluid from one side of said cylinder to change the speed of relative movement between said work support and said tool support upon actuation of said second timer means and non-actuation of said switch means at said check point, said control means being made inoperative upon actuation of said switch means.

Claim 5

A machine tool for performing a predetermined machining cycle comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting relative movement between said work support and said tool support; valve means including spool valve means slidably received therein; first switch means energized upon movement of said spool valve means in one direction; second switch means energized upon movement of said spool valve means in an opposite direction; change-over means to establish, when energized, a fluid communication between one side of said cylinder and one side of said spool valve means and between the other side of said spool valve means and a tank to move said spool valve means in said one direction, and to establish, when energized, a fluid communication between one side of said cylinder and the other side of said spool valve means and between said one side of said spool valve means and said tank to move said spool valve means in the opposite direction; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting at least one check point during a machining cycle; third switch means adapted to be actuated at said check point when an actual machining is occurring at a predetermined machining cycle; and, relay means for energizing said change-over means upon actuation of said second timer means and the non-actuation of said third switch means at said check point, said first switch means being energized upon movement of said spool valve means in said one direction for deenergizing said relay means to deenergize said change-over means to move said spool valve means in said opposite direction, said second switch means being energized upon movement of said spool valve means in said opposite direction for energizing said relay means to energize said change-over means to move said spool valve means in said one direction, and wherein said relay means is held deenergized upon actuation of said third switch means.

Claim 6

A machine tool for performing a predetermined machining cycle comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting relative movement between said work support and said tool support; valve means including spool valve means slidably received therein; first switch means energized upon movement of said spool valve means in one direction; second switch means energized upon movement of said spool valve means in an opposite direction; change-over means to establish, when energized, a fluid communication between one side of said cylinder and one side of said spool valve means and between the other side of said spool valve means and a tank to move said spool valve means in said one direction, and to establish, when energized, a fluid communication between one side of said cylinder and the other side of said spool valve means and between said one side of said spool valve means and said tank to move said spool valve means in the opposite direction; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting at least one check point during a machining cycle; third switch means adapted to be actuated at said check point when an actual machining is occurring at a predetermined machining cycle; and, relay means for energizing said change-over means upon actuation of said second timer means and the non-actuation of said third switch means at said check point, said first switch means being energized upon movement of said spool valve means in said one direction for deenergizing said relay means to deenergize said change-over means to move said spool valve means in said opposite direction, said second switch means being energized upon movement of said spool valve means in said opposite direction for energizing said relay means to energize said change-over means to move said spool valve means in said one direction, and wherein said relay means is held deenergized upon actuation of said third switch means.

Claim 7

A machine tool for performing a predetermined machining cycle comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting relative movement between said work support and said tool support; a sizing device adapted to be engaged with a workpiece to generate a signal responsive to the diameter thereof; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting at least one check point during a machining cycle; control means operable in response to a signal from said sizing device at said check point for exhausting fluid from one side of said cylinder to change the speed of relative movement between said work support and said tool support; and, means for rendering said control means inoperative when a predetermined amount of fluid is exhausted from said one side of said cylinder by means of said control means.

Claim 8

A machine tool for performing a predetermined machining cycle comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting relative movement between said work support and said tool support; a sizing device adapted to be engaged with a workpiece to generate a signal responsive to the diameter thereof; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting at least one check point during a machining cycle; control means operable in response to a signal from said sizing device at said check point for exhausting fluid from one side of said cylinder to change the speed of relative movement between said work support and said tool support; and, means for rendering said control means inoperative when a predetermined amount of fluid is exhausted from said one side of said cylinder by means of said control means.

Claim 9

A machine tool for performing a predetermined machining cycle as set forth in claim 4, wherein said tool support is movable towards and away from said work support, said tool support being retracted away from said work support for a succeeding machining operation when said first timer means is timed out.

Claim 10

A machine tool for performing a predetermined machining cycle including rough and fine machining operations comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting rElative movement between said work support and said tool support; a sizing device adapted to be engaged with a workpiece to generate a signal responsive to the diameter thereof; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting a first check point during a rough machining operation; third timer means timed out after a predetermined time period from the start of a machining cycle for setting a second check point during a fine machining operation; control means operable in response to a signal from said sizing devices at each of said check points for exhausting fluid from one side of said cylinder to change the speed of relative movement between said work support and said tool support; and, means for rendering said control means inoperative when a predetermined amount of fluid is exhausted from said one side of said cylinder by means of said control means.

Claim 11

A machine tool for performing a predetermined machining cycle including rough and fine machining operations comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting rElative movement between said work support and said tool support; a sizing device adapted to be engaged with a workpiece to generate a signal responsive to the diameter thereof; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting a first check point during a rough machining operation; third timer means timed out after a predetermined time period from the start of a machining cycle for setting a second check point during a fine machining operation; control means operable in response to a signal from said sizing devices at each of said check points for exhausting fluid from one side of said cylinder to change the speed of relative movement between said work support and said tool support; and, means for rendering said control means inoperative when a predetermined amount of fluid is exhausted from said one side of said cylinder by means of said control means.

Claim 12

A machine tool for performing a predetermined machining cycle comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting relative movement between said work support and said tool support; a sizing device adapted to be engaged with a workpiece to generate a signal responsive to the diameter thereof; valve means including spool valve means slidably received therein; first switch means energized upon movement of said spool valve means in one direction; second switch means energized upon movement of said spool valve means in an opposite direction; change-over means to establish, when energized, a fluid communication between one side of said cylinder and one side of said spool valve means and between the other side of said spool valve means and a tank to move said spool valve means in said one direction, and to establish, when deenergized, a fluid communication between one side of said cylinder and the other side of said spool valve means and between said one side of said spool valve means and said tank to move said spool valve means in an opposite direction; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting at least one check point during a machinine cycle; relay means for energizing said change-over means in response to a signal generated from said sizing device at said check point, said first switch means being energized upon movement of said spool valve means in said one direction for deenergizing said relay means to deenergize said change-over means to move said spool valve means in said opposite direction, said second switch means being energized upon movement of said spool valve means in said opposite direction for energizing said relay means to energize said change-over means to move said spool valve means in said one direction; and, counter means for holding said relay means deenergized after said first switch means is actuated a predetermined number of times.

Claim 13

A machine tool for performing a predetermined machining cycle comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting relative movement between said work support and said tool support; a sizing device adapted to be engaged with a workpiece to generate a signal responsive to the diameter thereof; valve means including spool valve means slidably received therein; first switch means energized upon movement of said spool valve means in one direction; second switch means energized upon movement of said spool valve means in an opposite direction; change-over means to establish, when energized, a fluid communication between one side of said cylinder and one side of said spool valve means and between the other side of said spool valve means and a tank to move said spool valve means in said one direction, and to establish, when deenergized, a fluid communication between one side of said cylinder and the other side of said spool valve means and between said one side of said spool valve means and said tank to move said spool valve means in an opposite direction; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting at least one check point during a machinine cycle; relay means for energizing said change-over means in response to a signal generated from said sizing device at said check point, said first switch means being energized upon movement of said spool valve means in said one direction for deenergizing said relay means to deenergize said change-over means to move said spool valve means in said opposite direction, said second switch means being energized upon movement of said spool valve means in said opposite direction for energizing said relay means to energize said change-over means to move said spool valve means in said one direction; and, counter means for holding said relay means deenergized after said first switch means is actuated a predetermined number of times.

Claim 14

A machine tool for performing a predetermined machining cycle as set forth in claim 7, wherein said relay means comprises first and second relays adapted to be selectively energized in response to a signal from said sizing device at said check point and wherein said counter means comprises first and second counters for holding said first and second relays respectively deenergized after said first switch means is actuated a predetermined different number of times.

Claim 15

A machine tool for performing a predetermined machining cycle as set forth in claim 8, wherein said spool valve means comprises first and second spool valves slidably received in said valve means, one side of saId first spool valve being fluid communicated with one side of said second spool valve through a second change-over means and with said first change-over means, the other side of said first spool valve being fluid communicated with the other side of said second spool valve and said first change-over means, and said second change-over means being selectively actuated in response to a signal from said sizing device to shut off fluid communication between said one sides of said first and second spool valves.

Claim 16

A machine tool for performing a predetermined machining cycle as set forth in claim 9, wherein adjusting means is provided for adjusting movements of said first and second spool valves in said opposite direction.

Claim 17

A machine tool for performing a predetermined machining cycle comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting relative movement between said work support and said tool support; valve means for setting the speed of relative movement between said work support and said tool support; a sizing device adapted to be engaged with a workpiece to generate a signal responsive to the diameter thereof; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting at least one check point during a machining cycle; detecting means for detecting a difference between a signal from said sizing device and a preselected signal at said check point; and, means responsive to a detected difference by said detecting means for regulating said valve means to change the speed of relative movement between said work support and said tool support.

Claim 18

A machine tool for performing a predetermined machining cycle comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting relative movement between said work support and said tool support; valve means for setting the speed of relative movement between said work support and said tool support; a sizing device adapted to be engaged with a workpiece to generate a signal responsive to the diameter thereof; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting at least one check point during a machining cycle; detecting means for detecting a difference between a signal from said sizing device and a preselected signal at said check point; and, means responsive to a detected difference by said detecting means for regulating said valve means to change the speed of relative movement between said work support and said tool support.

Claim 19

A machine tool for performing a predetermined machining cycle as set forth in claim 11, wherein said tool support is movable towards and away from said work support, said tool support being retracted away from said work support for a succeeding machining operation when said first timer means is timed out.

Claim 20

A machine tool for performing a predetermined machining cycle including rough and fine machining operations comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting relative movement between said work support and said tool support; first valve means for setting a rough machining speed of relative movement between said work support and said tool support; second valve means for setting a fine machining speed of relative movement between said work support and said tool support; a sizing device adapted to be engaged with a workpiece to generate a signal responsive to the diameter thereof; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting a first check point during a rough machining operation; third timer means timed out after a predetermined time period from the start of a machining cycle for setting a second check point during a fine machining operation; detecting means for detecting a difference between a signal from said sizing device and a preselected signal at each of said check points; and, means responsive to a detected difference by said detecting means for regulating said first and second valve means to change the speed of relative movement between said work support and said tool support.

Claim 21

A machine tool for performing a predetermined machining cycle including rough and fine machining operations comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting relative movement between said work support and said tool support; first valve means for setting a rough machining speed of relative movement between said work support and said tool support; second valve means for setting a fine machining speed of relative movement between said work support and said tool support; a sizing device adapted to be engaged with a workpiece to generate a signal responsive to the diameter thereof; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting a first check point during a rough machining operation; third timer means timed out after a predetermined time period from the start of a machining cycle for setting a second check point during a fine machining operation; detecting means for detecting a difference between a signal from said sizing device and a preselected signal at each of said check points; and, means responsive to a detected difference by said detecting means for regulating said first and second valve means to change the speed of relative movement between said work support and said tool support.

Claim 22

A machine tool for performing a predetermined machining cycle comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting relative movement between Said work support and said tool support; valve means including a resiliently urged spool valve slidably mounted therein and provided with a bevel groove for setting the speed of relative movement between said work support and said tool support; a stepping motor for shifting, when rotated, said spool valve against a resilient force to change the effective area of said bevel groove to change the speed of relative movement between said work support and said tool support; a sizing device adapted to be engaged with a workpiece to generate a signal responsive to the diameter thereof; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting at least one check point during a machining cycle; counter means for detecting a difference between a signal from said sizing device and a preselected value stored therein at said check point; and, means for rotating said stepping motor through an amount corresponding to a detected difference by said counter means.

Claim 23

A machine tool for performing a predetermined machining cycle comprising: a work support for supporting a workpiece; a tool support for supporting a tool; feed means including a hydraulic cylinder for effecting relative movement between Said work support and said tool support; valve means including a resiliently urged spool valve slidably mounted therein and provided with a bevel groove for setting the speed of relative movement between said work support and said tool support; a stepping motor for shifting, when rotated, said spool valve against a resilient force to change the effective area of said bevel groove to change the speed of relative movement between said work support and said tool support; a sizing device adapted to be engaged with a workpiece to generate a signal responsive to the diameter thereof; first timer means timed out after a predetermined time period from the start of a machining cycle for setting a constant machining cycle time; second timer means timed out after a predetermined time period from the start of a machining cycle for setting at least one check point during a machining cycle; counter means for detecting a difference between a signal from said sizing device and a preselected value stored therein at said check point; and, means for rotating said stepping motor through an amount corresponding to a detected difference by said counter means.