| Patent Number |
Title Of Patent |
Date Issued |
| 7554782 |
Safety PLC |
June 30, 2009 |
| A safety PLC having duplex power supply circuits, includes: a first output-stage transistor; a first DC power supply that drives the first output-stage transistor; a second output-stage transistor; a second DC power supply that drives the second output-stage transistor; a signal tran |
| 7459910 |
Contact welding detecting device for relay |
December 2, 2008 |
| A contact welding detecting device includes: a relay including a first contact for permitting and breaking transmission of a first DC input potential to a first output and a second contact for permitting and breaking transmission of a second DC input potential; a relay open/close con |
| 7286885 |
Safety programmable logic controller |
October 23, 2007 |
| The function block memory unit stores a plurality of function blocks by programming each ladder circuit for computing output signals which has to be determined based on input signals from each safety device according to a connection specification of the safety device. The ladder circuit |
| 4616322 |
Method and apparatus for preparing spare tools for a machine tool |
October 7, 1986 |
| In a numerical control system, a plurality of machine tools are provided each having a tool spindle, a tool magazine for storing primary tools along with spare tools respectively associated with some of the primary tools, and a tool changer for changing tools between the tool spindle and |
| 4608645 |
Numerical control system for a machine tool with a tool dimension compensation function |
August 26, 1986 |
| A numerical control system is provided wherein numerical controllers associated with machine tools are respectively coupled to auxiliary controllers communicating with a host computer. Each auxiliary controller has a memory for storing revision values which respectively correspond to |
| 4404506 |
Tool position offsetting system for a spare tool |
September 13, 1983 |
| A tool position offsetting system for a spare tool, including a tool life detecting device provided for detecting a broken or substantially worn tool and for replacing the same by a spare tool, and a detecting device which detects whether the spare tool is inserted in the tool spindle. I |
| 4366421 |
Index apparatus for a rotary table |
December 28, 1982 |
| An index apparatus for a rotary table comprises first and second index plates connected to a driving motor. First and second switches are provided for generating first and second signals in cooperation with the first and second index plates each time the rotary table is rotated a unit |
| 4298928 |
Data transfer system for data exchange between two operation processors |
November 3, 1981 |
| A data transfer system in which a programmable sequence controller, a computerized numerical controller and a pair of data transfer devices are associated respectively with the controllers. Each of the transfer devices includes a data memory and a first read-out and write-in circuit for |
| 4122634 |
Cam grinding machine |
October 31, 1978 |
| A cam grinding machine rotates a workpiece by using a servomotor which is capable of being rotated at a variable speed. A memory device stores data of rotational speeds of the workpiece corresponding to angular positions thereof in order to maintain the circumferential speed of the workp |
| 4107589 |
Automatic tool change apparatus |
August 15, 1978 |
| In an automatic tool change apparatus, numbers of tools stored in respective tool holding devices mounted on a magazine and held in a spindle are identifiable whether the tools are large or small ones. A combination of a tool held in the spindle and a tool commanded by NC data is dis |
