US3680415A - Automatic lathe - Google Patents

Automatic lathe Download PDF

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Publication number
US3680415A
US3680415A US38695A US3680415DA US3680415A US 3680415 A US3680415 A US 3680415A US 38695 A US38695 A US 38695A US 3680415D A US3680415D A US 3680415DA US 3680415 A US3680415 A US 3680415A
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United States
Prior art keywords
cam
cutting tool
automatic lathe
arm
linear
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 - Lifetime
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US38695A
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English (en)
Inventor
Hirotugu Takano
Toshitsugu Inoue
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B7/00—Automatic or semi-automatic turning-machines with a single working-spindle, e.g. controlled by cams; Equipment therefor; Features common to automatic and semi-automatic turning-machines with one or more working-spindles
    • B23B7/02—Automatic or semi-automatic machines for turning of stock
    • B23B7/06—Automatic or semi-automatic machines for turning of stock with sliding headstock
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/22—Feeding members carrying tools or work
    • B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
    • B23Q5/341—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission cam-operated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q7/00—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting
    • B23Q7/04—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting by means of grippers
    • B23Q7/047—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting by means of grippers the gripper supporting the workpiece during machining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q7/00—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting
    • B23Q7/12—Sorting arrangements
    • 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
    • G05B19/19—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 characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
    • G05B19/40—Open loop systems, e.g. using stepping motor
    • 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
    • G05B2219/49287—Motor drives cam for very fine linear displacement, movement
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/51—Plural diverse manufacturing apparatus including means for metal shaping or assembling
    • Y10T29/5124—Plural diverse manufacturing apparatus including means for metal shaping or assembling with means to feed work intermittently from one tool station to another
    • Y10T29/5125—Stock turret
    • Y10T29/5126—Swiss type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/13—Pattern section
    • Y10T82/135—Cam-controlled cutter

Definitions

  • ABSTRACT An automatic lathe wherein a plurality of cutters are provided in confronting relation to a rotating rod material, and the movement of the said rod material and the said cutters are controlled according to a working information stored in a tape or card, whereby a complete parts is obtained automatically according to the said working information.
  • the most typical one of the conventional automatic lathes is a Swiss-type automatic lathe, which will be described hereunder with reference to FIGS. 1 to 6.
  • a Swiss-type automatic lathe In turning a rod material, first of all, the rod material 1 is rotated and a cutter 2 is fed in the radial direction of the rod material 1 or in the direction of the arrow a, to turn the peripheral wall of the rod material as shown in FIG. 1.
  • the depth of turning is variable depending upon the degree of feeding of the cutter 2.
  • a cutter 3 is fed in the axial direction of the rod material 1 or in the direction of the arrow b and pressed against the end face of the rod material, whereby the end face of the rod material 1 is cut.
  • a hole may be formed in the end face of the rod material 1 by using a drill as the cutter 3.
  • the rod material is moved in the direction of the arrow 0.
  • An automatic lathe is constructed according to such basic arrangement of the rod material 1 and the cutters 2, 3.
  • a first cutting tool 4, a second cutting tool 5, a third cutting tool 6, a fourth cutting tool 7 and a fifth cutting tool 8 are arranged radially of a rod material 9 to be cut.
  • the first cutting tool 4 and the second cutting tool are mounted on a rockable cutter mount 11 which is rockable about a fulcrum 10.
  • both the first cutting tool 4 and the second cutting tool 5 are held out of contact with the rod material 9.
  • the rocking motion of the rockable cutter mount 11 is caused by a cam 13 which is mounted on a cam shaft 12 to be rotated thereby and held in engagement with a cam follower l4, fixed to the cutter mount 11, to cause it to move up and down, the cam shaft 12 being driven at a constant speed.
  • the cam follower 14 is held in pressure contact with the cam 13 under the biasing force of a spring 15.
  • a control cam 16 for the third cutting tool 6 is fixedly mounted on the cam shaft 12 and a cam follower 19 provided on an arm 18 is yieldably pressed against the control cam 16 by a spring or the like (not shown).
  • the arm 18 is pivotable about a pivot pin 17 and has one end pivotally connected to one end of a link 20.
  • the link 20 has the other end pivotally connected to one end of an arm 22 which is pivotable about a pivot pin 21.
  • the other end of the arm 22 is provided with a set screw 23 which is in abutting engagement at one end with the end face of a cutter mount 24 which holds the third cutting tool 6.
  • a tool mounting shaft 26 is provided in alignment with the axis of the rod material 9.
  • This tool mounting shaft 26 is constantly biased backward by a spring or the like (not shown) and has a drilling tool 27 mounted therein.
  • An arm 28 is pivotably mounted on a pivot pin 29, with one end located opposite to the rear end of the tool mounting shaft 26.
  • the other end of the arm 28 is provided with a pin 31 which is in sliding engagement with the cam surface of a barrel cam 30.
  • a tool mount 32 in which the tool shaft 26 is mounted has another tool shaft 33 mounted therein, and this tool mount 32 is pivotable about a pivot pin 34 as shown in FIG. 5.
  • An arm 35 is connected to the tool mount 32 at one end and the other end of the arm 35 is provided with a cam follower 36, which is held in pressure engagement with a cam 37 under the biasing force of a spring 38, the cam 37 being fixedly mounted on the cam shaft 12.
  • the tool mount 32 is pivoted about the pivot pin 34 by the cam 37 to bring either the tool shaft 26 or 33 into axial alignment with the rod material 9.
  • the arm 28 is pivoted about the pivot pin 29 by the barrel cam 30 and pushes the tool shaft 26 or 33 from the backside by one end thereof, so that the drilling tool mounted in the tool shaft is pressed against the end face of the rod material 9 to drill a hole therein.
  • the rod material is controlled as follows: In order to keepthe rod material rotating and to effect forward or backward movement of the rod material in relation with the respective tools, use is made of a mechanism called material feeder.
  • This material feeder is generally indicated at 39 in FIG. 6.
  • the rod material 9 is extended through the material feeder 39 and gripped therein by a collet chuck 40.
  • the collet chuck 40 is operatively connected with a motor 44 through a pulley 41, a belt 42 and a pulley 43, to be driven thereby.
  • On the collet chuck 40 is mounted a ring 45 which tighten the collet chuck 40 around the rod material 9 when moved in the direction of the arrow d and releases the same from the rod material when moved in the opposite direction.
  • the horizontal movement of the ring 45 is effected by a cam 46 which is mounted on the cam shaft 12 and operates a cam follower 47 which is operatively connected to the collet chuck through arms 48, 49. Therefore, whether the collet chuck 40 grips the rod material or releases it is determined by the configuration of the cam 46.
  • the rod material 9 can be moved in the direction of the arrow e in FIG. 6, by pushing the material feeder 39 in the same direction by an arm 50 against the biasing force of a spring 51, with the rod material being gripped by the collet chuck 40.
  • the arm 50 is connected at one end to the material feeder 39 and caused to make a pivotal movement by a cam 52 which is mounted on the cam shaft 12 and held in engagement with a cam follower 53 provided at the other end of said arm 50.
  • the conventional Swiss-type automatic lathe is so constructed that the axial movements of a plurality of cutting tools toward and away from the rod material and the feeding of the rod material are all effected by a number of cams mounted on a single cam shaft 12. Therefore, it had the disadvantage that the configurations of the respective cams become complicated as the final configuration of the desired part becomes compli'cated, which rendered the design and manufacture of the cams difficult and even made it impossible to produce the cams in such complicate configurations due to the limited diameters of the cams.
  • Another disadvantage is that all of the cams must be replaced with new ones every time when the type of the parts to be obtained is changed.
  • the lathe may be used expense-wise forthe production of a parts in a quantity as large, forexample, as 10,000 or more, it cannot be used for the production of the parts in a lesser quantity because the preparatory expense and time are too large to make the business profitable.
  • the present invention aims to obviate the foregoing disadvantages of the prior art automatic lathes.
  • the first object of the invention is to provide an automatic lathe which is so designed that a working information fed thereto externally is converted into an electric signal and a drive source is controlled by the electric signal, whereby the movements of a rod material to be worked and cutting tools for working the rod material are suitably controlled and a parts of desired configuration is obtained.
  • Another object of the invention is to provide an automatic lathe of the character described above, wherein cam plates each having a cam surface in the shape of an Archimedes curve in cross-section are mounted on a shaft driven from the drive source, while cam followers are provided on the driven elements such as the cutting tools and held in engagement with the cam surfaces of the cam plates respectively, so that the driven elements may be moved in proportion to the angle of rotation of the shaft, and the angle of rotation of the drive source is controlled, whereby the driven elements are moved precisely by the desired dimensions respectively.
  • Still other object of the invention is to provide an automatic lathe of the character described above, wherein the cam surface of each of the cam plates consists of a relatively small diameter portion defining an Archimedes curve of larger curvature and a relatively large diameter portion defining an Archimedes curve of smaller curvature, whereby the cutting tools are quickly moved toward the rod material when the rod material is to be worked and are held remote from the rod material when the rod material is not to be worked.
  • Yet still other object of the invention is to provide an automatic lathe of the character described above,
  • each of the cam followers in engagement with the cam surface of the associated cam plate is slidably mounted on an arm connected to the associated driven element, and the cam follower and said arm are operatively secured to each other by means of a clutch mechanism which is actuated by the electric signal, whereby the driven element is operated or stopped accurately according to the working information.
  • Yet other object of the invention is to provide an automatic lathe of the character described above,
  • means for detecting the state, of engagement or disengagement of the clutch mechanism is provided so as to prevent a plurality of cutting tools from being fed concurrently toward the rod material and colliding against each other.
  • Yet other object of the invention is to provide an automatic lathe of the character described above, wherein a cutting tool mount rockably mounted on a pivot pin and having a pair of cutting tools fixed thereto is provided with two cam followers, while cam plates each having a cam surface in the shape of an Archimedes curve in cross-section are mounted on a common rotary shaft for engagement with the respective cam followers in such a manner thatthe cam surfaces thereof are opposite to each other in the direction of inclination, one of the cam followers being fixed to the rockable cutting tool mount and the other one of the cam followers being mounted to the rockable cutting tool mount through a clutch mechanism, whereby cam plates of the same size as the cam plates for the other cutting tools can be used for operating the pair of cutting tools and the rockable cutting tool mount can be operated without using a cam plate of particularly large size.
  • Further object of the invention is to provide an automatic lathe of the character described above, wherein two drive sources are provided, of which one is used to cause an axial movement of a material feeder having a rod material to be worked securely gripped therein and another one is used to move a plurality of cutting tools provided in confronting relation to the rod material, both of the drive source and clutch mechanisms provided for the respective cutting tools being operated according to a working information, whereby a parts in conformance to the working information is obtained.
  • Yet further object of the invention is to provide an automatic lathe of the character described above, wherein an origin switch is provided in an incrementalopen loop type electrical control means adapted to control the drive source upon reading the working information, so as to detect the position of the origin each time when one parts has been completed, and the angle of rotation of the drive source is controlled based on the position of the origin, whereby even if a step error occurs in the electrical control means through some unexpected reasons during working, it will not be accumulated in the following parts.
  • Still other object of the invention is to provide an automatic lathe of the character described above, wherein whether or not the parts has been worked precisely in accordance with the working information is checked by comparing the numerical value of the working information and the numerical value of the signal obtained on rotation of a driven element operating shaft with each other, using the origin switch.
  • Still other object of the invention is to provide an automatic lathe of the character described above, wherein, in order to preclude the actual dimensions of the worked parts from becoming larger or smaller than the numerical values of the working information, which is possible due to wear of the cutting edge of the cutting tool or attachment of a foreign material to the cutting edge of the same even if the cutting tool is fed precisely, means is provided to actually measure the dimensions of the worked parts and adjust the numerical values of the working information by an amount corresponding to the error, so that a parts of accurate dimensions may always be obtained.
  • Yet other object of the invention is to provide an automatic lathe of the character described above, wherein discrimination chutes are selectively positioned below a parts dropping position by the function of solenoids which are actuated by the working information and a signal representative of good or bad of a worked parts checked according to a check instruction, whereby the worked parts are automatically discriminated by the type and quality.
  • Still other object of the invention is to provide an automatic lathe of the character described above, wherein a drill mount movable toward the end face of the .rod material is rotatably supported by an arm operated from the drive source and a plurality of drilling tools are mounted in said mount, the tool mount being rotated by a solenoid operated according to the working information, whereby the drilling tools are selectively positioned in a working position to work the 'end face of said rod material.
  • Still other object of the invention is to provide an automatic lathe of the character described above, wherein a collet chuck is provided in the material feeder and opened or closed by a solenoid which is operated according to the working information, whereby the rod material is positively gripped by released from the collet chuck.
  • FIG. 1 is a diagram showing the basic relative position of a rod material and cutting tools in normal tuming operation
  • FIG. 2 is a view showing the essential portion of a conventional Swiss-type automatic lathe as viewed in the axial direction of a rod material;
  • FIG. 3 is a side view of the portion shown in FIG. 2;
  • FIG. 4 is a top plan view of a drill mount in the conventional Swiss-type automatic lathe
  • FIG. 5 is a back view of the drill mount
  • FIG. 6 is a side view, partially broken away, of a material feeder portion of the conventional Swiss-type automatic lathe
  • FIG. 7 is a view showing briefly the entire construction of an embodiment of the automatic lathe according to the present invention.
  • FIG. 8 is a front view, partially broken away, of the position correcting mechanism in the automatic lathe of FIG. 7;
  • FIG. 9 is a perspective view of the position correcting mechanism of the automatic lathe for moving and controlling the drilling tool shaft, with a portion thereof broken away to show the essential portion;
  • FIG. 10 is a vertical cross-sectional view of a limit detector
  • FIG. 11 is a view showing the arrangement of the lead switches used in the limit detector
  • FIG. 12 is a vertical corss-sectional view of an origin detector
  • FIG. 13 is a view showing the arrangement of the lead switches of the origin detector
  • FIG. 14 is a block diagram showing the control system of the automatic lathe
  • FIG. 15 is a diagram for explaining the operation of the position correcting mechanism
  • FIG. 16 is a circuit diagram for explaining the operation of a stepping motor
  • FIG. 17 is a timing diagram showing the current phase of the stepping motor and the operation of the origin switch
  • FIG. 18 is a diagram showing the operation of a cutting tool under numerical control
  • FIG. 19 is a view briefly showing the construction of a parts discriminating device
  • FIG. 20 is a side view, partially broken away, of a chuck by which a sample parts is taken out for measurement
  • FIG. 21 is a side view of a parts measuring device
  • FIG. 22 is a diagram for explaining the operation of the parts measuring device
  • FIG. 23 is a diagram showing the output change of a differential transformer in the measurement of the dimensions of a parts
  • FIG. 24 is a block diagram of an automatic dimension measuring unit
  • FIG. 25 is a diagram illustrating the principle of a linear cam.
  • the automatic lathe of the present invention is generally composed of a machine tool unit to transmit the drive of a drive source to cutting tools and a rod material, and a control unit to control the operation of the machine tool unit.
  • the machine tool unit is further broadly divided into a material feeder unit and a cutting tool mounting unit.
  • numeral designates a material feeder.
  • a collet chuck to grip or release an elongate rod material 61 and a motor to impart rotation to the rod material are not shown, they are essentially same as those used in the conventional Swiss-type automatic lathe and a description thereof will be omitted.
  • the material feeder unit of the invention differs from that of the conventional Swiss-type automatic lathe, in the manner of operating a ring (not shown) provided around the collet chuck and the manner of operating the material feeder 60.
  • an electromagnetic coil 62 to operate the ring, and an arrangement is made such that when the electromagnetic coil 62 is energized, an arm 63 is pulled and thereby the ring is moved to cause the collet chuck to grip the rod material 61, whereas when the electromagnetic coil 62 is de-energized, the arm 63 is returned to the original position as by a spring, whereby the collet chuck releases the rod material 61.
  • the material feeder 60 is constantly biased backward by a spring 64 so as to eliminate a back-lash, and is moved forward against the biasing force of the spring 64 by an arm 66 pivoted on a pin 65.
  • a steppingmotor 67 is used as a drive source for the material feeder.
  • the drive of the stepping motor 67 is transmitted from the drive shaft 68 of the motor to a cam shaft 71 through intermeshing gears 69, 70, to rotate a linear cam 72 mounted on the cam shaft.
  • the rotating linear cam 72 causes a movement of a cam follower 73 in engagement with the cam surface of the linear cam and the movement of the cam follower 73 is trans: mitted to the arm 66 through an arm 74.
  • the material feeder 60 is moved by the arm 66.
  • the linear cam 72 is an essential element in the present invention and will be described in further detail hereunder.
  • the linear cam 72 is so designed that the lift (inclination) of the cam surface is in a fixed proportional relation with the angle of rotation.
  • the cam surface of the cam 72 has an Archimedes curve.
  • a cam such as the cam 72 whose cam surface defines an Archimedes curve is referred to as linear cam.
  • Numeral 75 designates an origin detector provided on the drive shaft 68 of the motor 67, which serves to determine the position of the material feeder 60 when the material feeder is to be returned to its original position upon completion of working of one parts, and the construction and function of the origin detector will be described later.
  • Numeral 76 designates a limit switch provided on the cam shaft 71, to detect the angle of rotation of the cam shaft 71, and the construction and function of the limit switch will be described later.
  • a first cutting tool 77, a second cutting tool v78, a third cutting tool 79, a fourth cutting tool 80 and a fifth cutting tool 81 are arranged radially of the rod material 61.
  • the first cutting tool 77 and the second cutting tool 78 are mounted on a rockable tool mount 82, while the third cutting tool 79, the fourth cutting tool 80 and the fifth cutting tool 81 are mounted on cutting tool mounts 83, 84 and 85., respectively.
  • the tool mounts 83, 84 and 85 are operated by links 86 (only one being shown) and arms (not shown) as in the conventional Swiss-type automatic lathe.
  • the way in which the rockable tool mount 82 and the tool mounts 83, 84 and 85 are operated is different from that in the conventional Swiss-type automatic lathe.
  • the drive shaft 88 of a stepping motor 87 and a cam shaft 89 are operatively connected with each'other by intermeshing gears 90, 91, and linear cams 92, 93 for operating the rockable tool mount 82 are mounted on the cam shaft 89 in such a manner that the lifts thereof are in opposite directions to each other.
  • the cam surfaces of the linear earns 92, 93 are in engagement with cam followers 94, 95 respectively which provided on an arm 96 connected to the rockable tool mount 82.
  • the cam follower 94 is fixed to the arm 96, whereas the cam follower 95 is connected to the arm 96 through a clutch mechanism to be described later, in such a manner that it isslidable relative the arm 96 when the clutch mechanism is disenergized to and can be fixed to the arm 96 by energizing.
  • the rockable tool mount 82 is constantly biased by a spring 97 to rotate clockwise unless the rotation is restricted by a stopper 118. Therefore, either the cam followers 94 or 95 is held in engagement with the linear cam 92 or 93.
  • linear cams 98, 99 and 100 for controlling the tool mounts 83, 84 and 85, respectively, and cam followers 104, and 106 .each provided on an arm through a clutch mechanism are in engagement with the cam surfaces of the linear cams 98, 99 and 100, respectively.
  • the relationship between the linear cams 98, 99, 100 and the cam followers 104, 105, 106 constitutes an essential feature of the invention and, therefore, will be described in detail with reference to FIG. 8. Referring to FIG. 8, there is shown the relationship between the linear cam 98 and the cam follower 104.
  • the arrangement of other linear earns 99, 100 and cam followers 105, 106 is the same as that of FIG. 8 and will not be described herein.
  • the linear cam 98 is so designed that the angle of rotation and the lift (radius) of the cam surface are in proportional relation to each other, and the lift thereof is formed in two steps.
  • the linear cam 98 has a cam surface which consists of two different Archimedes curves.
  • FIG. 25 which shows the principle of the linear cam, the inclination of the portion of the cam surface from a point A to a point B is made constant relative to the angle of rotation and is also made steep and the inclination of the portion from the point B to a point C is also made constantrelative to the angle of rotation but is made gradual relative the inclination of the portion from the point A to the point B.
  • the cam surface of the linear cam 98 is so shaped that the portion from the point A to the point B has a lift of 0.1 mm for each angle of rotation of 1 and the portion from the point B to the point C has a lift of 0.02 mm for each angle of rotation of 03.
  • the rotating speed of the stepping motor 87 is reduced by the gears 90, 91 such that the cam shaft 89 having the linear cam 98 mounted thereon will rotate 0.3 for every one step rotation of the stepping motor.
  • the stepping motor 87 rotates one step each time one electric pulse is given thereto.
  • FIG. 8 shows that the clutch mechanism is in the engaged position. Namely, a clutch coil 107 is energized and an armature 108 is attracted to the right hand in FIG.
  • the ratio of the distance from the pivot pin 112 of the arm 101 to the pivot pin 113, to the distance from the pivot pin 112 to the tip of the cam follower 104 is made 1 2 for enhancing the precision. Therefore, the tool mound 83 moves 0.01 mm on every one step rotation of the stepping motor 87.
  • the lift of the cam follower 104 is large relative to the angle of rotation of the linear cam 98 and, therefore, the third cutting tool 79 is quickly moved toward the rod material 61.
  • the cam follower 104 is at a point adjacent the point A, the third cutting tool 79 is held remote from the rod material 61. This is for the purpose of preventing the chip, produced by turning of the rod material 61 by the other cutting too, from wrapping around the third cutting tool 79.
  • the lift of the portion from the point A to the point B is made large so that the third cutting tool 79 may quickly be fed over such a remote distance and the operation efficiency may be enhanced.
  • the third cutting tool 79 is positioned very close to the rod material 61, and thereafter the cam follower 104 is displaced at a low speed according to the small lift of the linear cam 98 provided by the portion beyond the point B. Therefore, the third cutting tool 79 is fed slowly toward the axis of the rod material 61 to turn the rod material. Furthermore, the arrangement is made such that the clutch pin 109 is disengaged from the notch 111 of the cam follower 104 only when the cam follower is located at the point A and is inserted into the notch only when the cam follower is located adjacent the point A.
  • the linear cams 92, 93 also have a cam surface consisting of two types of inclination, similar to the linear cam 98 described above.
  • numeral 114 designates a magnet which is mounted on a plate 115 connected to the armature 108, in substantially opposed relation to a lead switch 116.
  • This magnet 114 is a permanent magnet and operated at the same time when the armature 108 is attracted upon energization of the clutch coil 107, to actuate the lead switch 116.
  • the lead switch 116 is opened when the armature 108 returns to its original position under the biasing spring 109.
  • This lead switch 116 constitutes a detecting circuit to verify the operation of the clutch pin 110 and to prevent a phenomenone wherein two or more cutting tools are fed concurrently as a result of the clutches provided on the other cam followers being energized concurrently.
  • Numeral 117 designates a Bakelite plate for mounting the lead switch 1 16 thereon.
  • cutting tools 119, 120 for working the end face of the rod material 61 are operated in the following manner: Namely, these cutting tools 119, 120 are mounted in tool shafts 121, 122 respectively which are operated by a barrel cam 123 mounted on the cam shaft 89.
  • the barrel cam 123 has a two-step linear cam surface and a cam follower 124 moves relative to the barrel cam along the cam surface, whereby an arm 125 is caused to make a pivotal movement about a pivot pin 125 and the tool shaft 121 or 122 is pushed by the other end of the arm 125.
  • the cutting tool 119 or 120, mounted in the tool shaft 121 or 122 is pushed against the end face of the rod material to perform a work such as drilling.
  • the cam follower 124 is controlled by a clutch 126.
  • the clutch 126 is, as shown in FIG. 9, essentially the same in construction and function as that of FIG. 8 and detailed description thereof will be omitted.
  • the clutch pin 1 10 of the clutch shown in FIG. 8 is used as the cam follower 124 as it is. Namely, when a. coil 107 is energized, an armature 108 is attracted, so that the cam follower 124 is projected for engagement of the cam surface of the barrel cam 123 and the movement of the cam follower 124 is transmitted to the arm 125.
  • the cam follower 124 is disengaged from the cam surface of the barrel cam 123 and hence the arm 125 is held stationary.
  • the tool shafts 121, 122 to be operated by the arm 125 are slidably supported in a drilling tool mount 127 which in turn is pivotably mounted on a pin 128.
  • a spring 129 is anchored to one side of the drilling tool mount 127 with respect to the pin 128, to pull the tool mount, while a cutting tool selection solenoid 130 is provided on the other side of the tool mount 127.
  • the tool mount 127 is pulled by the spring 129 to locate the drilling tool 119 opposite to the end face of the rod material 61, whereas when the solenoid 130 is energized, the tool mount 127 is caused to rotate about the pin 128 by the solenoid 130 against the biasing force of the spring 129, to locate the drilling tool 120 opposite to the end face of the rod material 61.
  • the tool shaft 121 or 122 is work can be performed on the end face of the rotating rod material.
  • the drive shaft 88 and the cam shaft 89 are provided thereon with an origin detector 131 and a limit switch 132 respectively which are identical in construction with the aforesaid origin detector 75 and limit switch 76. 7
  • the limit switch 132 includes a boxshaped housing composed of a cover 133 and an insulating plate 134 and the box-shaped housing is fixed unmovably with aspace to the cam shaft 89.
  • a lead switch 135 for advance limit and a lead switch 136 for retraction limit On the insulating plate 134 are provided a lead switch 135 for advance limit and a lead switch 136 for retraction limit.
  • An arm 137 is fixed to the cam shaft 89 and a magnet 13.8 is fitted to the arm at a location opposite to the lead switches 135 and 136.
  • the limit switch 132 of the construction described above operates in such a manner that, when the cam shaft 89 is rotated in normal direction and the magnet 138 carried thereon approaches the lead switch 135, the contacts of the lead switch 135 are closed to stop the rotation of the stepping motor 87, and when the magnet 138 approaches the lead switch 136, the contacts of the lead switch are closed to stop the rotation of the stepping motor 87.
  • the origin detector 131 includes a box-shaped housing composed of a cover 139 and an insulating plate 140, and the boxshaped housing is fixed unmovably with a space to the drive shaft 88 of the stepping motor 87.
  • the insulating plate 140 is provided thereon with a lead switch 141, while an arm 142 fixed on the drive shaft 88 is provided thereon with a magnet 143 so as to be opposed by the lead switch 141. Therefore, when the drive shaft 88 is rotated and the magnet 143 approaches the lead switch 141, the contacts of the lead switch are closed and a signal is emitted which is an origin signal.
  • This origin signal is emitted at a position opposite to the point B of the linear cam 98, and the angle of rotation of the drive shaft 88 is determined based on this position.
  • the lift of the linear cam 72 is one step and, therefore, the origin signal is emitted at a point adjacent the stepped portion.
  • control unit The construction of the control unit is as shown in the block circuit diagram of FIG. 14.
  • the lines going out from and coming into the block circuit diagram are all connected to the electric elements of the machine tool unit respectively for transmission of electric signals therethrough to perform a turning operation automatically.
  • the operations of the respective blocks will be explained in sequence hereinafter.
  • a paper tape 144 is provided therein with perforations representing the controlling information which is indicated in terms of predetermined numerals, alphabets or symbols.
  • a tape reader 145 reads the tape 144, all the information thus read is fed to a decoder 146, wherein the information is sorted by the type of the code signified by the information.
  • a solenoid control means 147 is actuated to energize a parts discrimination solenoid to be described later.
  • a cutting tool selection clutch control means 148 is actuated to operate a pertinent cutting tool selection clutch.
  • the code is further fed to a motor control means 149, which in turn issues an instruction to operate either the main drive shaft driving motor or the cutting tool operating motor.
  • the code signal is fed to the motor control means 149, which in turn switches the motor operating circuit from normal rotation to reverse rotation or vice verse.
  • a numeral code is set in a numeral register 150 to be memorized therein, the numeral register is of the type of four digit of decimal numbers.
  • a speed designating code acts on a pulse generator 151 to determine the frequency of the pulse generated thereby. This pulse is a step pulse to operate the stepping motor and the frequency thereof determines the rotational speed of the motor.
  • a correction instructing code is fed to a timing control means 152 to effect a positional correction to be described later.
  • An operation start instructing code is fed to the timing control means 152 and a numerical control operation is commenced only after the timing control means receives the said code.
  • the operation start instructing code enters the timing control means
  • a signal is given to the tape reader to stop its operation and successively thereafter a pulse generating instruction is given to the pulse generator 151, whereby the pulse generator starts to generate pulses continuously.
  • the first one pulse is fed to the motor control means 149 to rotate either the stepping motor for the main drive shaft or the stepping motor for the cutting tool one step in the direction previously designated.
  • the first pulse is also fed to the timing control means 152 and thence to a subtraction circuit 153 to subtract l from the numeral memorized in the numeral register 150. For instance, when the numeral memorized in the numeral register 150 is 100, it become 99 and this numeral 99 is memorized in the numeral register.
  • the numeral memorized in the numeral register is transmitted to a zero decision circuit 154 on each subtraction of the numeral but no signal will be emitted from the zero decision circuit 154 unless the numeral becomes zero.
  • the stepping motor is rotated one step and at the same time numeral 1 is subtracted from the numeral memorized in the numeral register 150 by the function of the subtraction circuit 153, as described above.
  • a signal is emitted from the zero decision circuit 154 and fed to the timing control means 152 to stop the operation of the pulse generator 151.
  • the pulse generator 151 thus stopped no longer generates a step pulse, so that the stepping motor stops rotating. Therefore, if the numeral initially set in the numeral register 150 is 100 or 1 mm, the stepping motor has been rotated 100 steps and the cutting tool mount associating with the clutch which has been in an ON position in this case, has been moved 1.00 mm.
  • a signal is sent from the timing control means 152 to the tape reader 145 to cause it to read the next information and thereby to carry out a new process. Thereafter, such operation is repeatedv to complete a finished parts.
  • the paper tape 144 is perforated as follows:
  • T is read by the tape reader and a signal representative of T is sent to the decoder 146, indicating that the successive numeral is a cutting tool designating code.
  • numeral 5 is read by the tape reader, whereupon the cutting tool selection clutch control means 148 is actuated to energize the clutch for the fifth cutting tool 81.Thus, the clutch pin is projected and the clutch is placed in an ON position.
  • the motor control means 149 is actuated to energize the circuit which operates the stepping motor 87 for the cutting tool.
  • the character S" is read by the tape reader and a signal representative of S is sent to the decoder 146, indicating that the following numeral is a speed designating code.
  • numeral 3 which follows is read by the tape reader and a signal representative of 3 is sent to the pulse generator 151, whereby the circuit of the pulse generator is set to generate pulses at the rate of 300 pulses/second.
  • the symbol is read by the tape reader and a signal thereof is fed to the decoder 146.
  • the decoder 146 identifies the +symbol as a rotational direction designating code and the motor control means 149 forms a circuit to rotate the stepping motor in normal directionsSince the decoder knows that the numeral following the symbol is a numeral which controls the position of the cutting tool, numeral l the numeral l is shifted to the next higher digit posi tion and numeral 2 is set in the lowest digit position of the numeral register 150. Similarly, when the next numeral 3" is read, the numeral 3'is plated in the lowest digit position of the numeral register 150 and numerals 1 and 2 are shifted to the next higher digit position respectively. Thus, numeral 123 is memorized in the numeral register.
  • a code CR which is to be read next is an operation start instructing code and the timing control means 152 starts to' tinue to rotate in normal direction.
  • the rotation of the cam shaft 89 and the linear cam is transmitted to the arm 103 and thence to the fifth cutting tool 81 to cause the latter to cut the rod material 61.
  • the pulse generatorv 151 ceases its operation and the stepping motor 87 stops precisely, even from a high speed because it has a large holding property, and generates a large braking force. Therefore, the fifth cutting tool 81 is positively held in a position 1.23 mm from its initial position.
  • the numericalcontrol system described above belongs to the incremental open loop type and hence a step error occurring under some conditions is accumulated
  • the automatic lathe according to the present invention is provided with means to eliminate such error. Namely, according to the invention, the error is eliminated by incorporating a correction instructing code in the paper tape in the form of perforations, which is also read by the tape reader.
  • the timing control means 152 controls a series of operations which will be explained with reference to FIG. 15.
  • the cam is held stationary and the cam follower moves relative to the cam, for the convenience of explanation.
  • the electrical connection is made such that when the cam follower is at a point A, the retraction limit switch is turned on, whereas when the cam follower is at a point B, the origin detector 131 is turned on.
  • the pulse generator 151 and the motor control means 149 operate so as to cause a reverse rotation of the stepping motor 87 at a high speed and the retraction limit switch is placed in the ON position. This condition lasts until a signal is sent from a check means'l55, shown in FIG. 14, to the timing control means 152. The signal passes through a portion where the origin detector is energized, but in this case the origin switch signal does not cause any action nor is the information memorized in the numeral register 150 changed.
  • the motor control means 149 switches the circuit of the stepping motor 87 for normal rotation and the frequency of the pulse generated by the pulse generator 151 is lowered, so that the motor proceeds at an intermediate speed to a point where the origin detector is placed in an ON position.
  • the origin switch is turned on, the stepping motor 87 is stopped at a certain phase in the exciting phase thereof to effect the correction at a more accurate absolute position, whereby the correction is completed.
  • the stepping motor is a four-phase exciting motor as shown in FIG. 16.
  • symbols L L L, and L designate exciting coils of the motor, respectively.
  • the current supply to the exciting coils is regularly switched by two switches SW SW to rotate the motor stepwise in a predetermined direction.
  • the switching is effected by means of transistors. If the timing of the switching operation is determined by pulses P as shown in FIG. 17, the phases of the intermittend current passing through the respective coils are as indicated by the hatching. If the time T is of the first phase, the times T T and T are of the second, the third and the fourth phases.
  • the correction completion signal END is to be emitted in the first phase T after the origin switch ORI has been turned on, the END signal is issued in the time T no matter at what portion of the period from the point D to the point B of FIG. 17 the origin switch ORI has been turned on, and the stepping motor is stopped and the current continues to flow through the coils L and L only to produce a braking force.
  • the tool mount can be stopped in a fixed absolute position, even if the position in which the origin switch ORI is turned on is slightly variable within the range from the point D to the point E.
  • a stable and highly precise position correcting operation is effected at each time when the tool mount begin to move, and, therefore, a positional control free of error accumulation can be attained, though the system is of the open loop type.
  • the cam surface of the linear cam 72 to operate the material feeder 60 has a uniform lift and hence the point at which the origin switch is turned on is located near the point A.
  • the positional correction of the material feeder 60 is performed in exactly the same manner as the positional correction of the cutting tool driving shaft.
  • the collet chuck which holds the rod material 61 is opened to release the rod material, retracted and closed again upon completion of the correction, all by the function of the solenoid control means 147. Therefore, the rod material is gripped again always with a correct dimension, and by making use of such advantageous feature, it is possible to obtain a parts longer than the movable range of the material feeder 60.
  • the origin detection signal is used in another way, in addition to the way described above. Namely, whether the position selected under numerical control was correct or not is verified by utilizing the origin detection signal in the following manner: A check instructing code punched in the paper tape 144 is read by the tape reader 145 and the numeral thus read from the tape 144 is set in the numeral register 150 as a reference numeral. This reference numeral is the distance from the present position of the cutting tool to the origin, plus numeral 4 when the position of the cutting tool is correct. Then, the timing control means perform a series of operations to be described hereunder, in accordance with the operation start instructing code read by the tape reader 145.
  • the point F is the present position of the cutting tool and the point G is the origin.
  • the dotted line a is the distance which the cutting tool has already moved under numerical control and the solid line [3 is a reference distance which the cutting tool will move.
  • the motor is set for reverse rotation from the present position F.
  • the pulse generator 151 is actuated and the motor is rotated in response to the pulse generated by the pulse generator.
  • I is subtracted from the numeral memorized in the numeral register 150, by the function of the subtraction circuit 153.
  • the motor continues to rotate and approaches the origin, it passes through the phases shown in FIG. 17, in the order of T T T T and T
  • the check completion signal END is emitted in the phase of T, which is the first phase after the origin signal ORI has disappeared.
  • the pulse generator stops its pulse generating operation and the motor is also stopped, so that the subtraction is interrupted. This position is four steps reverse from the aforesaid correction point.
  • the numeral memorized in the numeral register becomes zero at this position. Therefore, the correctness of the tool position is verified by a signal emitted by the zero decision circuit 154. If the numeral memorized in the numeral register is minus, this means that more pulses than the correct number of pulses, corresponding to that required in the case of normal rotation, has been required and the point F has been selected beyond the correct position of the cutting tool. Conversely, if the numeral memorized in the numeral register 150 is plus, this means that the cutting tool has stopped before the point F. In either case, a corrective action is taken as will be described later.
  • means is provided to preclude an error in the positional control which is possible to occur unexpectedly in the incremental open loop system, in addition to the means to correct the origin described previously.
  • the operation of removing the completed parts includes three steps, i.e. the step of separating the parts from the chips, the step of sorting the parts by the types and the step of removing defective parts.
  • the parts 156 produced by turning the tip of the rod material 61 is cut from the rod material by means of a cutting tool 157.
  • a solenoid 158 is energized from the solenoid control means 147, to locate a parts delivery chute 159 in a position below the parts 156.
  • the chute 159 is pivotably supported on a pin 160 and constantly biased by a spring 161 but is positioned below the parts by the action of the solenoid 158, only when the parts 156 is dropped. Therefore, the chip will not fall on the chute during normal turning operation of the lathe, and the parts are thus separated from the chip.
  • the parts 156 cut from the rod material drops and slides on the chute 159 and led onto a discrimination chute 162. If three discrimination chutes are in the positions shown in FIG. 19, the parts slides on the discrimination chutes 162, 163 and drops into a first pocket 164.
  • the discrimination chutes 162, 163 and 167 are pivotably mounted on pins 168, 169 and 170 and pulled in the same direction by springs 171, 172 and 173 respectively. In the state shown in FIG. 19, the respective chutes are pulled and inclined by solenoids 165, 166 against the biasing forces of the springs.
  • the parts will be received in a second pocket 174 by being guided by the discrimination chutes.
  • the solenoid is de-energized and the solenoid 166 is energized, the parts will be received in a third pocket 175.
  • the solenoids 165, 166 are both de-energized, the parts will be received in a fourth pocket 176. Therefore, by suitably energizing the solenoids 165, 166 according to the information punched in the tape 144, the parts can be sorted by the types.
  • the delivery chute 159 will become inoperative, even with the information incorporated in the tape 144, afid the defective parts are discarded together with the c ip.
  • an automatic dimension measuring means 177 is provided as shown in FIG. 14, to actually measure the dimensions of the parts.
  • a dimensional error detected by the automatic dimension measuring means 177' is' memorized in a compensation register 178 and the value memorized in the dimension measuring means is added to or subtracted fromthe numeral memorized in the numeral register 150, so as to compensate the dimensional error by changing the cutting tool control distance by a dimension corresponding to the dimensional change of the cutting edge.
  • FIG. shows the detail construction of a parts sampling mechanism for measuring the dimensions of a sample parts.
  • the parts sampling mechanism is in a position immediately before the parts 156 is cut from the rod material 61 by the cutting tool.
  • a chuck 179 is provided coaxially with the rod material 61, into which one end of the parts 156 is inserted as the rod material 61 is moved forward.
  • the chuck 179 consists of an elastic body having slits 179 formed therein and is rotatable with the parts because the parts 156 is still rotating when inserted into the chuck 179.
  • the chuck 179 is rotatably mounted on a stationary shaft 180 through a large number of balls 180', which stationary shaft is fixedly connected to a cover 181 secured to an upper end of an arm 182.
  • the arm 182 has its lower end pivotally mounted on a shaft 183.
  • the parts thus supported by the chuck 179 is removed from the working position while being carried by the arm 182 along an arcuate locus as shown in FIG. 22.
  • Two upper and lower contactors 184, 185 to measure the diameter of the parts 156 are provided at an intermediate position of the arcuate locus and the parts 156 passes through the interspace of the contactors while urging the contactors outwardly. The parts thus measured is then knocked out of the chuck 179, and the next parts is measured in the manner described.
  • a dimension measuring instrument having the aforesaid contactors 184, 185 comprises two T-shaped arms 186, 187 connected together by a pin 188 into H- shape, for pivotal movement about the pin.
  • the contactors 184, 185 are provided at one confronting ends of the arms 186, 187, while a differential transformer 189 is provided at the other ends.
  • the differential transformer 189 has a coil 190 disposed therein and a cylinderical hollow is formed at the center thereof.
  • a cylindrical core 191 of a magnetic material is removably disposed in the cylindrical hollow. This cylindrical core 191 is screw-threaded through a nut .192 provided on the arm 186 and is provided with a handle 193 so that the position thereof may readily be adjusted by rotating the handle.
  • the arms 186, 187 are biased by a spring 194 to urge the contactors 184, toward each other.
  • the space interval between the contactors 184, 185 will not become smaller than a predetermined interval because a bolt 196 is provided on the arm 186 by a nut 195 for engagement with a stopper 197 provided on the arm 187.
  • the vertical displacement of the core 191 can be taken out as a voltage change or current phase change.
  • the axis of ordinate represents a change in electric signal (V) corresponding to a displacement of the core 191 and the axis of abscissa represents time (t).
  • the time referred to here is the period in which the parts 156 passes between the contactors 184, 185 without stopping. Assuming that the magnitude of the electric signal.
  • a larger dimension means insufficient forward movement of the cutting tool, so that the correct dimension can be obtained only by adding the correction value. Conversely, where the dimension is smaller, the correct dimension can be obtained by the subtraction of the correction value.
  • the automatic dimension measuring means 177 is composed of a circuit as indicated by the block diagram of FIG. 24. Namely, a signal emitted from the differential transformer 189 is fed to a head value detecting circuit 198 which detects and memorizes the peak value of the curve shown in FIG. 23. The peak value thus detected is fed to an averaging circuit 199 which derives a mean value of the peak value and the previously measured values, and the mean value is digitized by an analog-digital converter circuit 200 and set in the correction register 178 shown in FIG. 14. The value thus set in the correction register is zero during calibration, is a plus value when the parts is larger and is a minus value when the parts is smaller. The value is set together with a plus or minus symbol.
  • Each of the control means shown in FIGS. 14 and 24 consists mainly of a digital circuit comprising electric parts, such as transistors, electrically connected with each other in a known manner, or of such digital circuit and an analog circuit combined with a portion thereof, so as to obtain the above-described functions respectively.
  • a paper tape incorporating

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US38695A 1969-05-26 1970-05-19 Automatic lathe Expired - Lifetime US3680415A (en)

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JP (1) JPS4937233B1 (enrdf_load_stackoverflow)
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FR (1) FR2048775A5 (enrdf_load_stackoverflow)
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978745A (en) * 1975-05-27 1976-09-07 Citizen Watch Co., Ltd. Numerically controlled automatic lathe
FR2486434A1 (fr) * 1980-07-12 1982-01-15 Tools Components Exports Ltd G Machine-outil a commande numerique pour usiner une piece tournante
US4584915A (en) * 1980-12-11 1986-04-29 Matsushita Electric Industrial Co., Ltd. Control system for a cam follower and tool
US20140099171A1 (en) * 2012-09-21 2014-04-10 James Gosselin Integrated clamping system for machine tools
US9694425B2 (en) 2011-03-30 2017-07-04 Fmb Maschinenbaugesellschaft Mbh & Co. Kg Bushing alignment device for a bar loading magazine and method
US10684606B2 (en) 2017-01-27 2020-06-16 Mitsubishi Electric Corporation Selection apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55125182U (enrdf_load_stackoverflow) * 1979-03-01 1980-09-04
ES2014407B3 (es) * 1985-11-26 1990-07-16 Citizen Watch Co Ltd Maquina de control numerico
US20190202017A1 (en) * 2017-01-27 2019-07-04 Mitsubishi Electric Corporation Selecting device, selecting method, and program

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1798143A (en) * 1927-06-15 1931-03-31 Dardelet Threadlock Corp Lathe attachment
GB771689A (en) * 1953-05-27 1957-04-03 Johann Letal Improvements in feed mechanism for the tool slides of automatic lathes and like machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1798143A (en) * 1927-06-15 1931-03-31 Dardelet Threadlock Corp Lathe attachment
GB771689A (en) * 1953-05-27 1957-04-03 Johann Letal Improvements in feed mechanism for the tool slides of automatic lathes and like machines

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978745A (en) * 1975-05-27 1976-09-07 Citizen Watch Co., Ltd. Numerically controlled automatic lathe
FR2486434A1 (fr) * 1980-07-12 1982-01-15 Tools Components Exports Ltd G Machine-outil a commande numerique pour usiner une piece tournante
EP0044200A1 (en) * 1980-07-12 1982-01-20 Ae Plc Machine tools
US4646596A (en) * 1980-07-12 1987-03-03 Edwards Walter C Machine tools
US4584915A (en) * 1980-12-11 1986-04-29 Matsushita Electric Industrial Co., Ltd. Control system for a cam follower and tool
US9694425B2 (en) 2011-03-30 2017-07-04 Fmb Maschinenbaugesellschaft Mbh & Co. Kg Bushing alignment device for a bar loading magazine and method
US20140099171A1 (en) * 2012-09-21 2014-04-10 James Gosselin Integrated clamping system for machine tools
US9387542B2 (en) * 2012-09-21 2016-07-12 James Gosselin Integrated clamping system for machine tools
US10684606B2 (en) 2017-01-27 2020-06-16 Mitsubishi Electric Corporation Selection apparatus

Also Published As

Publication number Publication date
GB1309561A (en) 1973-03-14
JPS4937233B1 (enrdf_load_stackoverflow) 1974-10-07
DE2025460B2 (de) 1976-07-15
DE2025460A1 (de) 1970-12-03
FR2048775A5 (enrdf_load_stackoverflow) 1971-03-19
CH526357A (de) 1972-08-15

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