|Publication number||USRE32837 E|
|Application number||US 07/082,093|
|Publication date||Jan 17, 1989|
|Filing date||Aug 3, 1987|
|Priority date||May 12, 1982|
|Publication number||07082093, 082093, US RE32837 E, US RE32837E, US-E-RE32837, USRE32837 E, USRE32837E|
|Original Assignee||Comau S.P.A.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (25), Non-Patent Citations (2), Referenced by (26), Classifications (11), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The invention relates to an improvement in coding systems for elements of machine tools, particularly of the numerically controlled type.
More specifically, the invention relates to a recognition system for elements such as tools or tool holders, which uses an optical or telecamera sensor and a "bar" code mounted on the coded element and readable by means of said optical sensor.
The fields of application of this system are various, so that only one of them will be described by way of nonlimiting example.
For example, in numerically controlled machine tools, the tools or tool holders held in store must be identified unambiguously by means of a code which can be read by the machine and then by a processor which controls the withdrawal and replacement of the necessary tools at any given time.
The various coding systems currently used include for example a system comprising an assembly of rings applied to the outside of the tool holder case, this resulting in considerable radial or axial overall size, according to the particular arrangement used, and a modification to the standard tool holder.
Another known system comprises an assembly of pins applied perpendicularly to the tool holder surface in seats formed directly in the tool holder and disposed along two generating lines of said tool holder at 180° to each other. Of the various drawbacks of this system, the most important is that it requires the tool holder to be in phase at least at the moment of reading the code, besides requiring the said modification to the standard tool holder.
A further known system uses for coding purposes an assembly of annular bands either applied to or integral with the tool shank, said annular bands being either electrically conducting or not electrically conducting according to the particular code for the tool concerned, the code being read by a line of electromagnetic proximity sensors independently of any phasing of the tool or tool holder. This system is costly and requires a lengthy application time, and in addition does not result in a high numerical selection capacity.
The object of the present invention is to provide an improved coding system for tools and tool holders which obviates the drawbacks of known systems. In particular, the proposed system reduces the costs and time of application of the tool recognition code, in addition to increasing the numerical selection capacity with respect to current systems, without altering the form of the standard tool holder.
According to the invention, a system is used for coding machine tool elements, characterized in that a "bar" code is applied to the element, the code being read by a reading head provided with a code detection sensor.
A preferred but non-limiting embodiment of the invention is described hereinafter with reference to the accompanying drawings, in which:
FIG. 1 is a fragmentary view of a tool holder shank provided with the coding system according to the present invention;
FIG. 2 is a view of the tool holder of FIG. 1 in the direction of the arrow A;
FIG. 3 is a diagrammatic view of a preferred method using the coding system according to the invention;
FIG. 4 is a plate carrying the bar code used by the invention;
FIG. 5 is a block diagram showing a possible but non-limiting embodiment of the decoder-detector circuit used;
FIG. 6 is a diagrammatic view of a second method using the coding system according to the invention.
FIGS. 1 and 2 show a tool or tool holder 10 of substantially conical configuration, connected to a cylindrical shank 11 by way of an annular zone 12 projecting from said elements 10 and 11.
The illustrated element is of known type, normally used on numerically controlled machine tools.
Two diametrically opposed recesses 13 are provided in known manner in the annular portion 12.
According to the invention, a plate 14 (FIG. 4) provided with a bar code is fitted into one of said recesses 13. The merits of the bar code itself will not be discussed in detail, this being an optoelectronic system available commercially and used currently in various applications.
It consists basically of a surface of the type illustrated in FIG. 4, i.e. constituted by a plurality of wide and narrow bars various interspersed and spaced apart. By convention, a wide bar can represent "one" in binary code, and a narrow bar can represent "zero" or vice versa. The required binary code is obtained by the different combinations of bars and their composition on the strip. The most suitable codes for this purpose are the "two-out-of-five" or "three-out-of-nine" code.
The preferred code will however be determined by the applicational requirements, in which respect the first type, namely the "two-out-of-five" code, is limited to the detection of figures plus a message initiation and termination signal, whereas the second, the "three-out-of-nine" code, has a greater capacity because it can also define letters, but for the same extent of message requires a greater quantity of signals, with consequent increased space requirements.
FIG. 3 diagrammatically illustrates one field of application of the invention. A tool store 15 carries in known manner a plurality of tools or tool holders of the type illustrated in FIGS. 1 and 2.
A bar code reading head 17 is inserted between the store 15 and the tool change unit 16. FIG. 5 shows the block diagram of the circuit of said head 17.
An optical sensor 18 detects the code on the plate 14 fitted to the tool holder. It is connected to an electronic pulse formation circuit 19 and to a decoder module 20, the purpose of which is to convert the pulses, which are read in series form on the bar code 14, into useful parallel output signals 21 (binary words).
The power supply from the mains reaches said components by way of a power supply circuit 22.
The output signals 21 are already suitable for feeding to the utilisation circuits of the series of words corresponding to the figures of the read code.
As an alternative to the described method, instead of using a reflection sensor with remote transmission of the electrical signal, it is possible to use a device as shown diagrammatically in FIG. 6, i.e. effecting total transfer of the image of the code 14 by means of a suitable optical system 24 on a linear telecamera 25 provided with a circuit for converting the image into parallel output signals 26 for utilisation.
In both the aforesaid cases, when the read code coincides with the code assigned to the required tool, authorisation is given for withdrawing the tool in question from the store, when this attains the predetermined axis.
Depending on the type of bar code and the relative reading system, it is possible to obtain a definition capacity of at least four decimal figures, equal to 10,000 numbers for assigning to tools. In this manner, an infinite number of tools can be coded, so enormously increasing the numerical selection capacity by an extremely low cost system.
In addition to the facility for using different types of bar code, it will be apparent that the plate 14 (FIG. 4), which has been illustrated by way of example only, can also be applied at points on the tool or tool holder other than the recesses 13, for example one of the two front surfaces of the annular portion 12, or the cone 10, the shank 11 or any other point of any tool or tool holder, should this have a different configuration, or should the machine in question have special constructional requirements which make a different form of reading head 17 necessary. In this respect, the application shown diagrammatically in FIG. 3 is given purely as a non-limiting example of the system according to the invention.
As already stated, this system can in fact be used for coding and recognising any machine tool element, whether this be a tool or any other part, or even a workpiece being machined.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US25737 *||Oct 11, 1859||Clothes-ekame|
|US3052011 *||Jun 27, 1958||Sep 4, 1962||Kearney & Trecker Corp||Machine tool with a mechanical cutting tool changer|
|US3052999 *||Mar 30, 1959||Sep 11, 1962||Kearney & Trecker Corp||Identifying means for tools|
|US3103006 *||Jun 15, 1960||Sep 3, 1963||Scully Anthony Corp||Machine tools|
|US3128645 *||Apr 18, 1960||Apr 14, 1964||Scully Jones & Company||Machine tool changer|
|US3173204 *||May 23, 1961||Mar 16, 1965||Scully Anthony Corp||Control for tool storage matrix, using individual re-settable code data registers|
|US3176847 *||Jul 20, 1962||Apr 6, 1965||Kearney & Trecker Corp||Tool identification system|
|US3187123 *||Apr 3, 1961||Jun 1, 1965||Scully Anthony Corp||Binary key identifier for machine tools|
|US3691626 *||Sep 10, 1970||Sep 19, 1972||Gorton Machine Corp||Tool change mechanism|
|US3804270 *||Jan 12, 1973||Apr 16, 1974||Bendix Corp||Bulk storage and automatic presenter system with image producing means|
|US3858892 *||Sep 18, 1972||Jan 7, 1975||Oerlikon Buehrle Ag||Tool holder equipped with a code carrier|
|US4152583 *||Mar 21, 1977||May 1, 1979||Mitsubishi Denki Kabushiki Kaisha||System for reading out bar coded labels|
|US4281342 *||Mar 28, 1979||Jul 28, 1981||Hitachi, Ltd.||Mark detecting system using image pickup device|
|US4374451 *||Aug 10, 1981||Feb 22, 1983||Rca Corporation||Method of assembling a CRT using a coded subassembly or part|
|US4430717 *||Aug 6, 1981||Feb 7, 1984||Okuma Howa Kikai Kabushiki Kaisha||Machine tool|
|US4439672 *||Jul 29, 1982||Mar 27, 1984||Lord Electric Company, Inc.||Control system for automated manipulator device|
|US4473883 *||Mar 26, 1981||Sep 25, 1984||Toshiba Kikai Kabushiki Kaiha||Machining systems and control systems therefor|
|US4530148 *||Feb 6, 1984||Jul 23, 1985||L. Schuler Gmbh||Tool changing mechanism|
|US4588339 *||Jul 2, 1984||May 13, 1986||Otto Bilz, Werkzeugfabrik||Tool holder for a cutting machine provided with numerical control|
|US4613942 *||Oct 22, 1984||Sep 23, 1986||Chen Richard M||Orientation and control system for robots|
|US4621410 *||Sep 30, 1982||Nov 11, 1986||Molins Plc||Automated machine installation and method|
|USRE25737||Aug 28, 1964||Mar 2, 1965||Kearney & Trecker Corp||Machine tool with mechanical cutting tool changer|
|DE1552431A1 *||Sep 13, 1966||Jun 4, 1970||Siemens Ag||Anordnung zum selbsttaetigen Wechseln von Werkzeugen|
|DE1808853A1 *||Nov 14, 1968||Jun 4, 1970||Maschf Augsburg Nuernberg Ag||Vorrichtung zum Abtasten kodierter Werkzeuge fuer numerisch gesteuerte Werkzeugmaschinen|
|DE2019359A1 *||Apr 22, 1970||Nov 4, 1971||Pittler Ag Maschf||Werkzeugauswaehleinrichtung|
|1||*||Control and Instrumention, vol. 13, No. 6, p. 59, Jun. 1981.|
|2||*||Wanner, Funkschau 21: p. 813 (1974).|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US6344018 *||Nov 24, 1998||Feb 5, 2002||Murata Kikai Kabushiki Kaisha||Press machine|
|US6409439 *||Oct 11, 2000||Jun 25, 2002||Seco Tools Ab||Convertible tool holder for a machine tool|
|US6952950 *||Mar 7, 2003||Oct 11, 2005||Waters Investment Limited||System and method for automatic identification of a detachable component of an instrument|
|US7088066||Jun 21, 2004||Aug 8, 2006||Thor Power Corp.||Automatic output power limiting electrical device|
|US7489856||Jun 25, 2004||Feb 10, 2009||Nokia Corporation||Electrical device for automatically adjusting operating speed of a tool|
|US7641537 *||Feb 21, 2007||Jan 5, 2010||Reishauer Ag||Rotating tool having an electric data carrier|
|US7669453||Feb 16, 2006||Mar 2, 2010||Wilson Tool International Inc.||Cartridge for machine tool|
|US7913533||Aug 7, 2006||Mar 29, 2011||Wilson Tool International Inc.||Machine tool cartridge with information storage device, smart cartridge systems, and methods of using smart cartridge systems|
|US8047746 *||Mar 13, 2007||Nov 1, 2011||Sandvik Intellectual Property Ab||Cutting-tool unit having a chip, a chip holder, and a device for mounting a chip holder|
|US8104688 *||Jun 15, 2009||Jan 31, 2012||Michael Wallace||Method and system for identifying a game piece|
|US8621909 *||Sep 21, 2011||Jan 7, 2014||Trumpf Werkzeugmaschinen Gmbh + Co. Kg||Tool wear compensation devices and related machines and methods|
|US9211581||Sep 21, 2007||Dec 15, 2015||Wilson Tool International Inc.||Stripper assemblies and components thereof for multi-tool punch assemblies|
|US20040173009 *||Mar 7, 2003||Sep 9, 2004||Nigel Doe||System and method for automatic identification of a detachable component of an instrument|
|US20050166689 *||Apr 4, 2003||Aug 4, 2005||Acticm||Mark provided in an environment to be measured and measuring system comprising same|
|US20060179694 *||Jan 30, 2006||Aug 17, 2006||Akins Charles T||Coding identification system and method for drill pipe|
|US20070186744 *||Aug 7, 2006||Aug 16, 2007||Lee Brian J||Machine tool cartridge with information storage device, smart cartridge systems, and methods of using smart cartridge systems|
|US20070191199 *||Feb 16, 2006||Aug 16, 2007||Ronald Palick||Cartridge for machine tool|
|US20070199983 *||Feb 21, 2007||Aug 30, 2007||Reishauer Ag||Rotating tool having an electric data carrier|
|US20070224005 *||Mar 13, 2007||Sep 27, 2007||Sandvik Intellectual Property Ab||Cutting-tool unit having a chip, a chip holder, and a device for mounting a chip holder|
|US20090078098 *||Sep 21, 2007||Mar 26, 2009||Wilson Tool International Inc.||Stripper assemblies and components thereof for multi-tool punch assemblies|
|US20090309303 *||Jun 15, 2009||Dec 17, 2009||Pure Imagination||Method and system for identifying a game piece|
|US20110175343 *||Mar 24, 2011||Jul 21, 2011||Pipe Maintenance, Inc.||Identification system for drill pipes and the like|
|US20120060580 *||Sep 21, 2011||Mar 15, 2012||Trumpf Werkzeugmaschinen Gmbh + Co. Kg||Tool Wear Compensation Devices and Related Machines and Methods|
|US20130167703 *||Jul 26, 2012||Jul 4, 2013||Hon Hai Precision Industry Co., Ltd.||Tag holder and workpiece using the same|
|EP1601951A2 *||Mar 5, 2004||Dec 7, 2005||Waters Investments Limited||System and method for automatic identification of a detachable component of an instrument|
|EP1601951A4 *||Mar 5, 2004||Feb 23, 2011||Waters Investments Ltd||System and method for automatic identification of a detachable component of an instrument|
|U.S. Classification||235/375, 483/9, 235/462.07|
|International Classification||G05B19/12, B23Q3/155|
|Cooperative Classification||G05B2219/23363, G05B19/128, Y10T483/134, B23Q3/15546|
|European Classification||G05B19/12W, B23Q3/155D4|
|Jun 5, 1989||FPAY||Fee payment|
Year of fee payment: 4
|Jun 5, 1989||SULP||Surcharge for late payment|