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"I watched his countenance closely, to see if he was not deranged ... and I was assured by other senators after he left the room that they had no confidence in it."
U.S. Senator Smith of Indiana ; After seeing Samuel Morse demonstrate the telegraph.
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| Number | Title | Issue Date |
| 4831365 | Cutting tool wear detection apparatus and method Sharp tools have different cutting characteristics from dull or worn tools. Among these differences is that a wear land develops on the cutting tool so that more of the cutting tool comes into contact with the workpiece during the cutting process. The inc... | 05/16/1989 |
| 4826370 | Indicator device Indicator device for determining the distance between a workpiece set up in a working machine, and a tool set up in said machine. The device comprises a lower portion (2) with an underside (13) which is adapted to lie against the workpiece, and an upper p... | 05/02/1989 |
| 4806914 | Detection by automatic gain control features of gradual cutting tool breakage A tool break detection system has an automatic gain control to adjust the analog signal channel gain and hold the cutting vibration signal at a desired average level. The AGC time constant is long enough that the detection of abrupt tool breaks and sudden... | 02/21/1989 |
| 4802274 | Method of determining worn rotary tool A method is disclosed of determining worn rotary tools during machining operations, comprising: (a) establishing the steady-state dominant tool force level required to (i) carry out a rotary machining operation at a given set of cutting conditions in the ... | 02/07/1989 |
| 4782451 | Process for maintaining liquid supply A method for ensuring that sufficient liquid is maintained in a liquid reservoir which is distant from a liquid supply station, comprising periodically determining the amount of liquid in the reservoir and sending the periodic determinations to a signal r... | 11/01/1988 |
| 4782452 | Acoustic detection of milling tool touch to a workpiece The initial contact of a rotating milling tool to a workpiece is detected in the presence of spurious noise spikes by digitally processing samples of a preprocessed vibration signal concurrently through basic tool touch detection logic and milling tool to... | 11/01/1988 |
| 4764760 | Automatic gain control for machine tool monitor An acoustic tool break detector monitors vibration caused by a cutting process and has an analog amplifier to condition the signal, then searches for a rapid sustained change in signal level indicative of a cutting tool break. An automatic gain control ci... | 08/16/1988 |
| 4761101 | Arrangement for wireless signal transmission from a rotating body to a stationary receiving station A rotating body, for example a chuck (10) comprises a sensor (56), a signal processing unit with amplifier and a plurality of transmitting diodes (14) and receiving diodes (16) peripherally spaced in a radial plane, in which also a stationary transceiving... | 08/02/1988 |
| 4758964 | Method and apparatus for monitoring machine parts To monitor machines for breakage and/or wear of the tool, the vibrations produced by dynamic forces generated by the machine parts are measured in the range of the natural frequency of the machine above the operating frequencies. The measured values are c... | 07/19/1988 |
| 4757307 | Tool condition sensing by measuring heat generation rate at the cutting edge A cutting tool is monitored on-line by measuring the heat generation rate at the cutting edge and relating this to the condition of the cutting edge. A flow of fluid coolant contacts the back surface of the cutting tool and the coolant temperature rise is... | 07/12/1988 |
| 4742470 | Tool identification system Provision is made for identifying tools used in an automated machine tool system. A module or transponder is mounted to the tool and interrogated by a transceiver which, in the preferred embodiments, has read/write capabilities. The transponder uses energ... | 05/03/1988 |
| 4736625 | Method and apparatus for monitoring the cutting condition of a machine tool during machining of a workpiece A device-implemented method for monitoring the cutting condition of a machine tool during machining of a workpiece senses acoustic emissions resulting from the machining of the workpiece, produces an electrical signals which varies in accordance with chan... | 04/12/1988 |
| 4733343 | Machine tool numerical controller with a trouble stop function A numerical controller for a grinding machine composed of a central processing unit (CPU), which is programmed to read out a numerical control program block by block from a memory device and to control a pulse generation circuit to generate pulses of such... | 03/22/1988 |
| 4724524 | Vibration-sensing tool break and touch detector optimized for machining conditions A Machine Tool Monitor detects significant cutting tool breakage and the first contact of an advancing tool to a workpiece, and does this by monitoring vibration signals produced by the machining of parts and interpreting patterns in these signals. Inform... | 02/09/1988 |
| 4710751 | Ground fault monitor circuit A sensor circuit for detecting a ground fault in devices that eliminate or prevent static electricity and for producing appropriate alarm signals to indicate an undesirable ungrounded condition. In particular, the sensor circuit includes means for monitor... | 12/01/1987 |
| 4707688 | Detection of tool breaks that cause slowly decreasing cutting noise Vibrations at the cutting tool-workpiece interface are sensed and the accelerometer output is preprocessed to yield a cutting noise vibration signal. Digital analysis of the sampled signal is performed to detect a gradual cutting noise signal level decrea... | 11/17/1987 |
| 4707687 | Detector to discriminate between tool break acoustic signatures and spiky noise In some machining conditions the background noise in an acoustic cutting tool break detection system is a low mean level with fairly dense high amplitude noise spikes. A common tool break vibration signature is the sudden appearance of a dense spiky noise... | 11/17/1987 |
| 4704693 | Acoustic tool touch detector with minimized detection delay A Machine Tool Monitor detects the sudden increase in vibration signal level when a slowly advancing cutting tool first touches the workpiece. The delay to a tool touch decision is reduced while still avoiding false alarms on high amplitude single-peaked ... | 11/03/1987 |
| 4693110 | Method and apparatus for testing the operability of a probe The present invention is directed to an apparatus and method of testing the operability of probes used in performing workpiece probing operations. According to the preferred embodiment of the present invention, the probe has a first circuit for generating... | 09/15/1987 |
| 4656868 | Method and apparatus for discriminating cutting state from non-cutting state in machine tool An apparatus for discriminating a machining state from a non-machining state in a machine tool wherein a workpiece is machined with a cutting tool or grinder, comprising plural vibration sensors including at least one acoustic-emission sensor, which detec... | 04/14/1987 |
| 4644335 | Apparatus and method for monitoring drill bit condition and depth of drilling Acoustic transducers are attached to each of the drill bits which produce electrical output signals in response to the vibrations during the drilling operation. A plurality of output signal includes waveforms having an amplitude and frequency dependent up... | 02/17/1987 |
| 4642617 | Acoustic tool break detection system and method Substantial cutting condition changes that occur gradually, as opposed to the more usual sudden large change, are detected by setting upper and lower cutting noise mean level thresholds. When the mean cutting noise exceeds the upper threshold or stays bel... | 02/10/1987 |
| 4636779 | Acoustic detection of tool break events in machine tool operations A system and method for monitoring vibrations of a cutting tool produced by tool break events, and for interpreting them to detect tool breaks of sufficient magnitude to endanger the machined part. The signal generated by a sensor such as an accelerometer... | 01/13/1987 |
| 4636780 | Acoustic monitoring of cutting conditions to detect tool break events This tool break detection system relies on monitoring changes in the cutting noise itself, rather than detecting the tool fracture acoustic signal. A broken tool capable of damaging the workpiece is detected, and tool break events that do not affect cutti... | 01/13/1987 |
| 4631465 | Tool display system of automatic tool changing apparatus A tool display system of an automatic tool changing apparatus (31) in a machine tool (30) sequentially controlled by a programmable controller (20) on the basis of a control signal from a numerical control unit (1). The tool display system is equipped wit... | 12/23/1986 |
| 4620281 | In-process cutting tool condition compensation and part inspection The condition of the cutting tool is monitored during a turning operation and the machine is adjusted to compensate for tool condition. The device is also used as an in-process part inspection system. A probe on the cutting tool-tool holder assembly measu... | 10/28/1986 |
| 4615197 | Thread rolling monitoring system A thread rolling monitoring system in which one or more signal generating devices is provided in the mounting system of the stationary die of a pair of thread rolling dies. A sensor develops a signal which is a function of the reaction forces in a directi... | 10/07/1986 |
| 4593277 | Apparatus and method for sensing excessive wear or failure of machine tool A channel is formed in the body of a machine tool holder, this channel extending to the area where the tool is working on the workpiece. A pneumatic flow away from the tool is established by means of a vacuum source connected to the channel. A pressure tr... | 06/03/1986 |
| 4591784 | Examination procedure for the spatial change of an object with respect to its initial condition Technical functional components variable relatively to a starting position are examined by comparing an image of the component, produced by relative motion with respect to sensor means, with a corresponding earlier, stored image, and by triggering a warni... | 05/27/1986 |
| 4591770 | Numerical controller The present invention is to increase the reliability of a numerical controller by permitting the detection of an abnormality in a position sensing pulse which is output each time a moving part moves by a fixed amount. A position sensor (6) outputs a refer... | 05/27/1986 |
| 4578555 | Fail-safe machine tool operational setting system with prerecorded verbal instructions A safety system for a machine tool, e.g. an EDM machine, having a multiplicity of different items of setting procedure to be attended to manually and inspected by the operator before the machine is actuated for performing a given machining operation, empl... | 03/25/1986 |
| 4559577 | Drilling machine A drilling machine including an electric drill being selectively fixed at a desired angle with respect to a workpiece and a manual feed handle for moving the electric drill toward and away from the workpiece. A control circuit for the electric drill is pr... | 12/17/1985 |
| 4559600 | Monitoring machine tool conditions by measuring a force component and a vibration component at a fundamental natural frequency Methods and apparatus for monitoring, during machining of a workpiece (30,30'), the wear condition of a cutting tool (31,31') having its cutting portion in a structure (32,32') that is held by substantially more massive means (33,33'). A dynamometer (35,3... | 12/17/1985 |
| 4558312 | Position detecting device An apparatus for use in determining the location of a surface of a solid object such as that being machined by a machine tool includes a stylus having an electrically conductive end that is supported by two support members, which are disposed in pressure ... | 12/10/1985 |
| 4558311 | Method and apparatus for monitoring the tool status in a tool machine with cyclic machining The vibration level (a) is measured and applied to controllable filter (F). The filter (F) is a band pass filter that only passes a narrow band around a certain frequency that is determined by the frequency (1) of the machining cycle. The output signal of... | 12/10/1985 |
| 4555698 | Detecting machine tool set-up errors A tool setting-aid comprising an anodized aluminum "button" and a support therefor is set up at a predetermined datum position on the worktable of a computer controlled machine tool, the machine program including a check cycle which sends the cutting tool... | 11/26/1985 |
| 4554534 | Control circuit for a multi-blow forming process A load sensor generates a signal representing the amount of force applied to a workpiece during each blow of a multi-blow forming process. In a two blow process, a first amplifier is connected to the load sensor for amplifying the load sensor signals repr... | 11/19/1985 |
| 4547772 | Multicoordinate sensing head A sensing pin is mounted to a housing by means of a linkage which makes it possible for the sensing pin to move entirely within the housing in the event of extreme deflection. In this way, extensive protection from damage is provided to the sensing pin in... | 10/15/1985 |
| 4536688 | Electric drilling machine The machine comprises an electric driving motor, a speed reducer having at least two mechanical ratios coupled to the output shaft of the motor, a device for changing the mechanical ratio and a speed variator of the electric motor. The machine further com... | 08/20/1985 |
| 4532501 | Capacitively coupled machine tool safety system A safety system for a machine tool is characterized by a capacitively coupled electric field generator (transmitter) and a capacitive receptor antenna. An electrical signal is induced in the capacitive receptor antenna by the action of the electric field.... | 07/30/1985 |
