GB1584647A - Controlled machine tool - Google Patents

Controlled machine tool Download PDF

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Publication number
GB1584647A
GB1584647A GB2456479A GB2456479A GB1584647A GB 1584647 A GB1584647 A GB 1584647A GB 2456479 A GB2456479 A GB 2456479A GB 2456479 A GB2456479 A GB 2456479A GB 1584647 A GB1584647 A GB 1584647A
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United Kingdom
Prior art keywords
machine tool
driven shaft
driven
tool according
dog member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2456479A
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Hurco Manufacturing Co Inc
Original Assignee
Hurco Manufacturing Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hurco Manufacturing Co Inc filed Critical Hurco Manufacturing Co Inc
Publication of GB1584647A publication Critical patent/GB1584647A/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/414—Structure of the control system, e.g. common controller or multiprocessor systems, interface to servo, programmable interface controller
    • G05B19/4142—Structure of the control system, e.g. common controller or multiprocessor systems, interface to servo, programmable interface controller characterised by the use of a microprocessor
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/34—Director, elements to supervisory
    • G05B2219/34034—Multiplier, prm, brm
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/34—Director, elements to supervisory
    • G05B2219/34215—Microprocessor
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/34—Director, elements to supervisory
    • G05B2219/34237—Multiplexed d-a a-d
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/35—Nc in input of data, input till input file format
    • G05B2219/35431—Interactive
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/35—Nc in input of data, input till input file format
    • G05B2219/35447—Potentiometer
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/35—Nc in input of data, input till input file format
    • G05B2219/35481—Display, panel
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/35—Nc in input of data, input till input file format
    • G05B2219/35556—Conversion inch to metric
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/36—Nc in input of data, input key till input tape
    • G05B2219/36111—Local memory instead of tape, or combined
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/36—Nc in input of data, input key till input tape
    • G05B2219/36117—Magnetic tape cassette
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/36—Nc in input of data, input key till input tape
    • G05B2219/36162—Pendant control box
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/36—Nc in input of data, input key till input tape
    • G05B2219/36557—Copy entered program in memory to tape
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/37—Measurements
    • G05B2219/37092—Display position actual and or target
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/37—Measurements
    • G05B2219/37154—Encoder and absolute position counter
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/41—Servomotor, servo controller till figures
    • G05B2219/41036—Position error in memory, lookup table for correction actual position
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/41—Servomotor, servo controller till figures
    • G05B2219/41047—Recirculating ballnut, ballscrew, preloaded bearing
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/43—Speed, acceleration, deceleration control ADC
    • G05B2219/43158—Feedrate override
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/43—Speed, acceleration, deceleration control ADC
    • G05B2219/43159—Feedrate override only for x y, not for z or only for z and not for x y
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/43—Speed, acceleration, deceleration control ADC
    • G05B2219/43161—Second, independent feedrate override
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/49—Nc machine tool, till multiple
    • G05B2219/49395—Repeating same operations for other coordinates
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/50—Machine tool, machine tool null till machine tool work handling
    • G05B2219/50031—Zero setting, go to reference with gauge
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/50—Machine tool, machine tool null till machine tool work handling
    • G05B2219/50294—Tool offset length by going to a reference and recording distance

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Numerical Control (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Control Of Position Or Direction (AREA)

Description

PATENT SPECIFICATION
( 11) ( 21) Application No 24564/79 ( 22) Filed 4 Jul 1977 ú ( 62) Divided out of No 1 584 645 1 ( 31) Convention Application No 702569 ( 32) Filed 6 Jul 1976 in U) ( 33) United States of America (US) ( 44) Complete Specification Published 18 Feb 1981 ( 51) INT CL 3 B 23 Q 5/34 15/013 ( 52) Index at Acceptance B 3 B 3 A 3 B 2 B 1 3 B 2 3 BX 7 ( 54) A CONTROLLED MACHINE TOOL ( 71) We, HURCO MANUFACTURING COMPANY, INC, of 6602 Guison Road, P O.
Box 68180, Indianapolis, Indiana 46268, U S A, a corporation organised under the laws of the State of Indiana, U S A, do hereby declare the invention, for whichwe pray that a patent may' be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:-
This invention relates to a controlled machine tool, for example a milling machine having a control system which regulates motion in the X, Y and Z directions.
1 It is an object of this invention to provide a 15, controlled machine tool in which the position of a movable component over a relatively long distance may be monitored by a mechanism which includes limit switches and occupies a shorter length.
According to this invention a controlled machine tool comprises: a ball screw driven by a motor for imparting motion along an axis; a driven shaft more finely-threaded than the ball screw and rotatably mounted in a frame member and driven by said motor; a dog member mounted on the driven shaft and free to move along the shaft as the shaft is rotated; means for preventing rotation of the dog member; and limit switches positionable on the frame member and operable to be activated by the dog member as it moves along the driven shaft, the threading of the driven shaft having a set relationship to the threading of the ball screw, whereby the movement of the dog member and placement of the limit switches is correlated to the degree of motion imparted along said axis.
The invention will now be described by way of example with reference to the drawings in which:Figure 1 is a front view of a three-axis mill adapted for operation with a three-axis microprocessor control system, shown with a control cabinet and a pendently mounted control panel; Figure 2 is an enlarged front view of the control panel of Figure 1; Figure 3 is a sectional view of the Z-axis servo apparatus of Figure 1 shown on its side; and Figure 4 is a top view of the Z-axis servo apparatus of Figures 1 and 3 55 Referring in particular to Figure 1, there is shown a control cabinet and control panel together with a 3 axis mill adapted for operation therewith Cabinet 11 contains the electronic hardware for the control system and is 60 mounted on casters 12 so as to be locatable beside or behind the 3 axis mill 13 Arm 14 extends upwardly and outwardly from the top of cabinet 11 to provide pendent mounting for a control panel 15 conveniently 65 positioned for easy access by the operator of the mill Control panel 15 shall be discussed in more detail hereinafter.
The movement control signals and position information signals are coupled between the 70 servo motor assemblies' and the control circuitry by cables 22, 23 and 24 as shown An enclosed X axis servo assembly 16 and an enclosed Y axis servo assembly 17 are shown in their appropriate locations on the mill 75 The Z axis servo assembly is shown generally at 18 without its normal casing, and further showing limit switch subassembly 19 which includes the encoder and limit switches as shall be described more particularly herein 80 after The servo motors for all three axes are substantially the same, and a limit switch subassembly such as 19 is associated with each servo.
As is known, table 20 of the milling machine 85 is moved in the XY plane by screw drives, which in this case are powered by servos 16 and 17.
A Z axis spindle assembly 21 is rotated by a spindle motor and also moved in the Z direction by servo 18 90 The control panel 15, shown in more detail in Figure 2 includes a power switch 201 for providing electrical power to the control system and a key-lock inch-millimeter selector 202 A machine mode positioning control 203 has six 95 positions for determining the X, Y or Z direction (plus or minus) for motion in JOG mode Additionally control 203 may be placed in the auto mode for automatically positioning the X, Y and Z axes according to programmed information, or 100 in one of two tape modes for energizing the tape cassette In the tape manual mode the cassette 1584647 1 584647 switches ON and REWIND 226 and 227 are enabled Depressing switch 226 causes the tape transport to operate in the forward direction while depressing button 227 causes the transport to operate in the rewind direction The tape auto position permits operation of the cassette under control of the stored program In the digital readout mode, the X, Y and Z axis positions are displayed In this mode, the servos for the three axes are disabled, and the machine may be manually operated and the control used as a digital readout device only.
In regard to spindle mode switch 204, when control 204 is in the off position, only the mill table moves in the X and Y direction and there is no Z direction movement for the spindle In the auto position, the spindle is moved in the Z direction normally per program instructions In the manual-on position the spindle is on and rotating, and a first depression of the spindle down push button 205 will cause the spindle to move to its Z down position, and a subsequent depression of push button 205 will result in the spindle returning to full up position In the manual-off position for control 204, the spindle motor is deenergized and the Z axis feed is per program only after the spindle down button 205 has been pushed, except Z moves to Z up dimension and remains until push button 205 is depressed again The spindle then retracts to its full up position.
Push button 206 is a motion hold button which stops all servo motion Button 207 is operable while depressed to provide coolant for the tool being utilized in the vicinity of the workpiece Button 208 starts operation of the mill when the control is in the operate or single cycle mode Button 209 is an emergency stop button which removes power from the control and motors, etc.
Two feed rate override controls are provided Knob 210 is the table feed rate override control, and when it is set at P (program) position no alteration of programmed table feed rate is obtained Spindle control knob 211 is similarly set at P for no effect on the feed rate in the Z direction for the mill spindle The manner in which these control settings effect programmed feed rates as they are moved to the left or right of P is discussed in more detail hereinafter.
A CRT screen 212 is provided for displaying data blocks etc A data entry keyboard 213 is supplied for placing data into the control memory in response to inquiries on the CRT 212.
Program keys 214 through 217 are provided for various functions involving entry of data into memory for execution of the program.
Next block key 214 advances the data block displayed on the CRT Advance key 215 advances the current inquiry displayed at the bottom of the CRT screen to the next data item for that data block If a number from keyboard 213 is entered through advance key 215, the CRT display will advance to the data block having a corresponding number Erase key 216 erases an entry made in response to the particular item of inquiry at the bottom of the CRT (unless the data block number is at the bottom of the CRT, in which case all data is erased 70 from that data block) Increment key 217 indicates, in response to an inquiry, that a dimension entered into a data block is to be measured from the last position rather than the initial reference position of the table or spindle The 75 sequence of inquiries on the CRT screen for a data block follows the sequence: date block number, machine mode, control mode, X dimension, Y dimension, Z dimension, feed rate, peck rate and tool number In addition, for 80 step-repeat blocks, the X and Y dimensions are requested as well as the number of repetitions in the X and Y directions In a milling block, an inquiry is made as to whether or not the milling is inside or outside frame milling 85 Therefor, the operator of the machine has control of the selection of number entries from the keyboard to identify various parameters in a data block The operator makes the type selections by number keys on the keyboard, 90 such as for Drill, Mill, etc By appropriate digit entries through the keyboard, the operator has control of the machine operating mode, control operating mode and part program coordinates.
There are four mode or control keys pro 95 vided Key 218 places the program in the enter mode Key 219 is for check mode, key 220 for single cycle operation and key 221 for operate mode.
Push buttons 222 through 224 affect 100 various items in the memory of the control.
Table zero 222 instructs the processor, in the operate mode, to look for marker switches to obtain a zero position When the program is in data block zero the table zero may be estab 105 lished over the full range of table travel by pushing table zero 222 when the table is in the desired location Programmed coordinates are then measured from that point Button 223 controls tool calibration in a similar fashion 110 In data block zero, pushing tool calibration establishes individual tool length calibration for the respective tool number on the display.
Tool length calibration may be established by manually lowering the Z axis with the tool in 115 place in the spindle until it reaches a desired zero reference plane then depressing tool calibration button 223.
Master clear push button 224 clears the machine set up information when the con 120 troller is in data block zero When master clear is depressed with the processor at any other data block, all data is cleared from data blocks 1-99 A tape cassette transport apparatus is shown generally at 225 for receiving a 125 magnetic tape cassette operable to read or write data to or from the RAM memory With mode switch 203 in the tape auto mode, the data block entries may be recorded onto a tape cassette In addition, previously recorded data 130 1 584647 may be read from the cassette and placed into the memory of the controller in order to duplicate a program established for operating on a workpiece to provide a desired part Push button 226 turns on the tape cassette deck and push button 227 is available to rewind the tape after play or record Read, write and search-for-date functions are controlled by data entry keys, when control 203 is in the TAPE auto mode As indicated above the tape manual mode the cassette switches ON and REWINDare enabled.
Referring now to Figures 3 and 4, there is shown the Z axis drive and positioning apparatus The Z axis drive provides a vertical servo motor-controlled feed drive system for the mill spindle and also provides a mechanical link for accurate linear positioning and feed rate control for vertical machining functions.
The drive for the spindle vertical feed is provided by a servo motor 241 which is mounted on a motor mounting plate 242 The motor mounting plate is adjustable relative to the Z axis spindle The-servo motor 241 drives a ball screw 243 through a pair of timing belt pulleys 244 and a timing belt 246 The ball screw is securely retained by a preloaded double race ball bearing 247 which allows rotation of the screw without any shaft end play.
The inner race of the bearing is secured by a lock nut 248 and adjacent lock washer The outer race is secured to the main frame 251 by a retainer cap 252 with cap screws 253 The main frame 251 is in turn rigidly secured to the mill head through a retainer plate 254 with cap screws 256.
Vertical motion of the spindle is obtained by rotation of the ball screw 243 driving a preloaded ball nut assembly 257 which is affixed to the Z axis carriage 258, which moves vertically on a pair of opposed "V" section tracks 259 via mating pairs of "V" rollers 261.
Rollers 261 are mounted on the carriage by carriage adjusting studs in carriage portions 262 and by lock nuts 263 The adjusting studs have an eccentric shank upon which the "V" rollers 261 are mounted Tightness of the carriage is adjusted by the eccentric moving the "V" rollers 261 in or out until the desired tightness is obtained.
The actual driving link between the mill spindle and the Z axis carriage 258 is a shank rod 264, which is attached to the carriage 258 by a pair of ball bearings 266 mounted in a preloaded state by compression of the flexible inner races with a bearing lock nut 267 and lock washer 268 The shank rod 264 is rigidly mounted in the mill spindle in tension by utilizing the existing spindle shank rod bearing and a tool adaptor (not shown) threaded to the shank rod.
Servo motor 241 drives ball screw 243 via the timing belt drive, thus driving preloaded ball nut 257 Ball nut 257 is mounted on the carriage 258, causing the carriage to travel vertically (in the Figure to the right), mounted on the "V" tracks 259 by "V" rollers 261, driving the shank rod 264 which is mounted to carriage 258 by ball bearings 266 The bearings allow spindle rotation to be isolated from ver 70 tical drive Thus the mill spindle is driven by being retained by a tool adapter (not shown) allowing accurate vertical spindle control when used with the limit switch assembly explained hereinafter 75 In order to provide a method of mounting limit switches and an encoder on an isolated mount that will provide accurate measuring of long distances in less space, the present limit switch assembly has been utilized It provides a 80 stable, end-play free, mount for the encoder.
The main frame 269 of the limit switch assembly is mounted to the motor mounting bracket 242 by a shoulder screw 271 and a lock nut 272.
This provides and adjustable mount for timing 85 belt tensipning Set screw and lock nut 273 and 274 provide a positive stop after the desired setting is made The driven belt 276 is driven by a pulley on the motor shaft extension and drives the driven shaft 277 which is mounted in 90 compression between two bearings 278 and 279 in the main frame 269 by retainer 281 on the outer race of the front bearing 279 and a snap ring at 282 on the outer ring of the rear bearing 278 A shoulder on the driven shaft 277 pro 95 vides the compression member, and nut 283 provides the adjustment for bearing 279 The driven shaft 277 is threaded with an extra-fine thread so that a ratio is obtained between the actual travel (rotation of motor shaft) and the 100 travel of the dog member 284 The dog member 284 is kept from rotating by guide bar 286 which is mounted on the main frame with cap screws 287 As the screw 277 rotates, the dog member 284 moves linearly, actuating the 105 appropriate limit switch 288 The limit switches may be mechanical as shown, or for example, photoelectric Adjustment of the limit switch location is made by loosening screw and washer 289 and 291 and sliding limit 110 switch bracket 292 in the keyway in the main frame 269 An alternative setting method is to remove the guide bar 286 and rotate the dog member 284 to the desired setting and replace the guide bar The encoder 293 is mounted to 115 the main frame 269 with its encoding disc (not shown) rigidly mounted to the driven shaft 277.
The control system of the above described machine and its associated software is described in more detail in our copending application no 120 27895/77 (Serial No 1584645) from which this application is divided.
Features of the carriage and frame assembly described above are claimed in our copending application no 79/24563 (Serial No 1584646) 125 which is also divided from application no.
27895/77 (Serial No 1584645).

Claims (6)

WHAT WE CLAIM IS:-
1 A controlled machine tool comprising: a ball screw driven by a motor for imparting 130 1 584647 motion along an axis; a driven shaft more finely-threaded than the ball screw and rotatably mounted in a frame member and driven by said motor; a dog member mounted on the driven shaft and free to move along the shaft as the shaft is rotated; means for preventing rotation of the dog member; and limit switches positionable on the frame member and operable to be activated by the dog member as it moves along the driven shaft, the threading of the driven shaft having a set relationship to the threading of the ball screw, whereby the movement of the dog member and placement of the limit switches is correlated to the degree of motion imparted along said axis '
2 A machine tool according to Claim 1 further comprising a rotary encoder having an encoding disc which is rigidly attached to the driven shaft.
3 A machine tool according to Claim I or Claim 2 wherein the means for preventing rotation of the'dog member is a guide bar parallel to the driven shaft and mounted on the frame 25 member.
4 A machine tool according to any preceding claim wherein the limit switches are mechanically actuated by the dog member.
A machine tool according to any of 30 Claims 1 to 3 wherein the limit switches are photoelectric.
6 A machine tool according to any preceding claim wherein the driven shaft is driven by the motor via a toothed belt and pulleys 35 WITHERS & RODGERS Chartered Patent Agents 4, Dyer's Buildings, Holborn, London, Agt ECIN 2 JT Agents for the Applicant Printed for Her Majesty's Stationery Office by MULTIPLEX medway ltd, Maidstone, Kent,ME 14 LJS 1981 Published at the Patent Office, 25 Southampton Buildings, London WC 2 l AY, from which copies may be obtained.
GB2456479A 1976-07-06 1977-07-04 Controlled machine tool Expired GB1584647A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US70256976A 1976-07-06 1976-07-06

Publications (1)

Publication Number Publication Date
GB1584647A true GB1584647A (en) 1981-02-18

Family

ID=24821762

Family Applications (3)

Application Number Title Priority Date Filing Date
GB2456479A Expired GB1584647A (en) 1976-07-06 1977-07-04 Controlled machine tool
GB2789577A Expired GB1584645A (en) 1976-07-06 1977-07-04 Microcomputer control apparatus for a machine tool
GB2456379A Expired GB1584646A (en) 1976-07-06 1977-07-04 Machine tool apparatus

Family Applications After (2)

Application Number Title Priority Date Filing Date
GB2789577A Expired GB1584645A (en) 1976-07-06 1977-07-04 Microcomputer control apparatus for a machine tool
GB2456379A Expired GB1584646A (en) 1976-07-06 1977-07-04 Machine tool apparatus

Country Status (7)

Country Link
JP (2) JPS536784A (en)
CA (1) CA1102434A (en)
CH (1) CH618528A5 (en)
DE (1) DE2730335A1 (en)
FR (1) FR2357943A1 (en)
GB (3) GB1584647A (en)
IT (1) IT1079960B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104875075A (en) * 2015-06-03 2015-09-02 安徽圣力达电器有限公司 Quick lowering, positioning and sawing system of saw machine

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5518383A (en) * 1978-07-28 1980-02-08 Toyoda Mach Works Ltd Numerical controller for controlling grinding
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Also Published As

Publication number Publication date
JPS6142289B2 (en) 1986-09-20
FR2357943A1 (en) 1978-02-03
GB1584646A (en) 1981-02-18
IT1079960B (en) 1985-05-16
FR2357943B3 (en) 1980-04-04
CH618528A5 (en) 1980-07-31
JPS536784A (en) 1978-01-21
DE2730335A1 (en) 1978-01-12
CA1102434A (en) 1981-06-02
JPS60186907A (en) 1985-09-24
GB1584645A (en) 1981-02-18
JPS6145248B2 (en) 1986-10-07

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