US2539027A - Vibrating tracer stylus - Google Patents
Vibrating tracer stylus Download PDFInfo
- Publication number
- US2539027A US2539027A US125204A US12520449A US2539027A US 2539027 A US2539027 A US 2539027A US 125204 A US125204 A US 125204A US 12520449 A US12520449 A US 12520449A US 2539027 A US2539027 A US 2539027A
- Authority
- US
- United States
- Prior art keywords
- stylus
- vibrating
- race
- pattern
- tracer
- 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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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/002—Details
-
- 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
- B23Q35/00—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually
- B23Q35/04—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually using a feeler or the like travelling along the outline of the pattern, model or drawing; Feelers, patterns, or models therefor
- B23Q35/24—Feelers; Feeler units
- B23Q35/26—Feelers; Feeler units designed for a physical contact with a pattern or a model
-
- 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
- Y10T409/00—Gear cutting, milling, or planing
- Y10T409/30—Milling
- Y10T409/303416—Templet, tracer, or cutter
- Y10T409/303472—Tracer
Definitions
- This invention relates generally to tracing styli for duplicating machines, and more particularly to means for rapidly vibrating a stylus in order to reduce the effects of friction between the stylus and a pattern over which it moves.
- a movable work table mounted on a frame supports a pattern of the contour to be reproduced and a blank in which the contour is to be reproduced.
- Adjacent to the model is mounted a tracing stylus or follower, and adjacent to the blank is mounted a power-driven cutting head.
- the stylus and cutting head are fixed relatively to each other, or are arranged so that the movement of the cutting head will be proportional to the movement of the stylus.
- the work table is provided with driving means that move the table in its own plane in two directions at right angles to each other, the work table being usually reciprocated in one direction and indexed or moved by small increments in the other direction.
- vibrations induced in a stylus enable it to move more freely over the pattern contour, thus enabling the cutting head a to reproduce in the blank more faithful copies of the pattern contour. It has also been found that the vibrations induced in the stylus should preferably be rapid but of comparatively small amplitude.
- a further object of the invention is to prov de a stylus vibrating device which may conveniently be a plied to conventional du licating machines.
- Fig. 1 is a broken away perspective view of a tracer stylus embodying the invention.
- Fig. 2 is a perspective view of a tracer stylus embodying an alternative form ofv the invention.
- an ordinary stylus holder 3 is provided with a collet type locking nut 4 which clamps the shank of a stylus 5, the free end 5a of the stylus being adapted to beavagainst a pattern 6.
- a collar I Suitably secured to the stylus immediately below the locking nut is a collar I having an upper internal flange la and a lower internal flange lb which define an annular chamber 8.
- An inlet pipe 9 which extends through the collar into the chamber 8 is adapted to be connected by a length of flexible tubing ID to a supply of fluid under pressure, preferably compressed air.
- the internal periphery of the upper flange 1a of the collar makes a substantially air-tight joint with the stylus 5 whereas there is provided in the internal periphery of the lower flange lb of the collar a helical groove 10 which is essentially a coarse thread. The crests of the thread engage the stylus, the thread grooves thus forming a helical conduit connecting the chamber 8 to the space below the lower flange 11).
- cup-like member II Concentrically mounted below the collar 1 and spaced therefrom is a cup-like member II which provides a race I2 in which a small steel ball I3 is free to roll in a circular path around the stylus 5.
- the diameter of the ball should be substantially greater than the space or gap between the collar I and the cup-like member I I.
- the rotation of the ball [3 around the stylus 5 produces an unbalance in the stylus of a frequency proportional to the speed of rotation of the ball around the stylus and an amplitude proportional to the weight of the ball and to the diameter of the race.
- the vibrations thereby induced in the stylus cause variations in the pressure of the stylus against the pattern 6, which variations in pressure tend to relieve the frictional drag of the stylus against the pattern, and prevent the stylus from sticking and advancing with a jerky motion.
- a small elementary turbine rotor hi is rotatably mounted on a stylus I5 shown bearing against a pattern it, by means of a ball bearing member I], the inner race of which is pressed onto the stylus.
- the turbine wheel is deliberately unbalanced by removing a small amount of metal at one point or by other means well known in the art.
- the frequency of the vibrations may be varied at will by providing a suitable throttle in the compressed air supply; in order to avoid resonant effects it is desirable to avoid vibrating the tracer stylus at any frequency which is a multiple of the frequency at which the cutter teeth engage the blank.
- the amplitude of the vibrations may be varied by changing the radius of rotation of the rotating unbalanced mass or by changing the magnitude of the unbalance.
- means for vibrating the stylus comprising a mass rotatably mounted on the stylus and unbalanced about its centre of rotation, and means for rotating said mass.
- means for vibrating the stylus comprising a mass rotatably mounted on the stylus and unbalanced about its centre of rotation, and means for rotating the mass including a nozzle arranged to direct a flow of fluid which impinges on the rotatable mass eccentrically of its centre of rotation.
- means for vibrating the stylus 4 comprising an endless race mounted on the stylus, a rollable body adapted to travel in the race, and means for causing the rollable body to travel in the race, including a nozzle arranged to direct a flow of fluid on the rollable body.
- means for vibrating the stylus comprising an annular race mounted on the stylus and having the stylus as its centre, a rollable body adapted to travel in the race, and means for causing the rollable body to travel in the race, including a collar mounted on the stylus adjacent the race, a conduit in the collar having one end connected to a supply of fluid under pressure and its other end being open and directed in the race to eject a flow of fluid which impinges on the rollable body.
- means for vibrating the stylus comprising an annular race mounted on the stylus and having the stylus as its centre, a rollable body adapted to travel in the race, and means for causing the rollable body to travel in the race, including a collar mounted on the stylus adjacent the race, a chamber in the collar and connected to a supply of fluid under pressure, a helical conduit in the collar coiled around the stylus and having one end connected to the chamber and its other end opening into the race for directing a flow of fluid into the race to roll the rollable .body in the race around the stylus.
- Atracer having a stylus adapted to bear against a pattern, means for vibrating the stylus com-prisingan unbalanced wheel. mounted on the stylus and means for rotating the wheel about the stylus.
- means for vibrating the stylus comprising a turbine wheel rotatably mounted on the stylus which provides its axis of rotation, and a nozzle arranged to direct a flow of fluid. on the wheel to rotate it about the stylus.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Testing Of Balance (AREA)
- Jigs For Machine Tools (AREA)
Description
Jan. 23, 1951 L. E. MARCHANT VIBRATING TRACER STYLUS Filed Nov. 3, 1949 HTTORNEY Patented Jan. 23, 1951 VIBRATING TRACER STYLUS Lawrence Edgar Marchant, Toronto, Ontario, Canada, assignor to A. V. Roe Canada Limited, Malton, Ontario, Canada, a corporation Application November 3, 1949, Serial No. 125,204
7 Claims.
This invention relates generally to tracing styli for duplicating machines, and more particularly to means for rapidly vibrating a stylus in order to reduce the effects of friction between the stylus and a pattern over which it moves.
Generally speaking, in mechanical duplicating machines, a movable work table mounted on a frame supports a pattern of the contour to be reproduced and a blank in which the contour is to be reproduced. Adjacent to the model is mounted a tracing stylus or follower, and adjacent to the blank is mounted a power-driven cutting head. The stylus and cutting head are fixed relatively to each other, or are arranged so that the movement of the cutting head will be proportional to the movement of the stylus. Usually the work table is provided with driving means that move the table in its own plane in two directions at right angles to each other, the work table being usually reciprocated in one direction and indexed or moved by small increments in the other direction.
It has been found that vibrations induced in a stylus enable it to move more freely over the pattern contour, thus enabling the cutting head a to reproduce in the blank more faithful copies of the pattern contour. It has also been found that the vibrations induced in the stylus should preferably be rapid but of comparatively small amplitude.
It is therefore an object of the invention to provide in a stylus a vibrating device which produces rapid low-amplitude vibrations.
A further object of the invention is to prov de a stylus vibrating device which may conveniently be a plied to conventional du licating machines.
All of the foregoing and still f"rther objects and advantages of the invention will become apparent from a study of the following specification. taken in conjunction with the accompanying drawings. wherein like characters of re erence indicate corresponding parts throughout the several views and wherein:
Fig. 1 is a broken away perspective view of a tracer stylus embodying the invention; and
Fig. 2 is a perspective view of a tracer stylus embodying an alternative form ofv the invention.
Referring to Fig. 1, an ordinary stylus holder 3 is provided with a collet type locking nut 4 which clamps the shank of a stylus 5, the free end 5a of the stylus being adapted to beavagainst a pattern 6. Suitably secured to the stylus immediately below the locking nut is a collar I having an upper internal flange la and a lower internal flange lb which define an annular chamber 8. An inlet pipe 9 which extends through the collar into the chamber 8 is adapted to be connected by a length of flexible tubing ID to a supply of fluid under pressure, preferably compressed air.
The internal periphery of the upper flange 1a of the collar makes a substantially air-tight joint with the stylus 5 whereas there is provided in the internal periphery of the lower flange lb of the collar a helical groove 10 which is essentially a coarse thread. The crests of the thread engage the stylus, the thread grooves thus forming a helical conduit connecting the chamber 8 to the space below the lower flange 11).
Concentrically mounted below the collar 1 and spaced therefrom is a cup-like member II which provides a race I2 in which a small steel ball I3 is free to roll in a circular path around the stylus 5. The diameter of the ball should be substantially greater than the space or gap between the collar I and the cup-like member I I.
In operation, high pressure air is admitted to the chamber 8 through the inlet pipe 9 and the flexible tubing It]. In order to escape from the chamber 8, the air travels downwardly through the helical conduit provided by the groove 10, which imparts a rapid whirling motion to the air and discharges it into the race I! where it causes the steel ball I3 to rotate rapidly around the stylus 5. The air is finally exhausted to atmosphere through the gap between the collar 1 and the cup-like member I l.
The rotation of the ball [3 around the stylus 5 produces an unbalance in the stylus of a frequency proportional to the speed of rotation of the ball around the stylus and an amplitude proportional to the weight of the ball and to the diameter of the race. The vibrations thereby induced in the stylus cause variations in the pressure of the stylus against the pattern 6, which variations in pressure tend to relieve the frictional drag of the stylus against the pattern, and prevent the stylus from sticking and advancing with a jerky motion.
In an alternative embodiment of the invention illustrated in Fig. 2, a small elementary turbine rotor hi is rotatably mounted on a stylus I5 shown bearing against a pattern it, by means of a ball bearing member I], the inner race of which is pressed onto the stylus. The turbine wheel is deliberately unbalanced by removing a small amount of metal at one point or by other means well known in the art. High pressure air from a nozzle l8 impinges tangentially against the turbine wheel; this causes the turbine wheel to rotate at a high speed, and because of the unbalance in the turbine wheel vibrations of a frequency proportional to the speed of rotation of the wheel and of an amplitude proportional to the static unbalance in the wheel are set up in the stylus !5, as in the preferred embodiment of the invention.
With either embodiment of the invention, the frequency of the vibrations may be varied at will by providing a suitable throttle in the compressed air supply; in order to avoid resonant effects it is desirable to avoid vibrating the tracer stylus at any frequency which is a multiple of the frequency at which the cutter teeth engage the blank. The amplitude of the vibrations may be varied by changing the radius of rotation of the rotating unbalanced mass or by changing the magnitude of the unbalance.
It is thought that the construction and use of the invention will be apparent from the above description'of-the various parts and their purpose. It is to be understood that the form of the invention herewith shown and described is to be taken as: a preferred example of the same and that various changes in the shape, size and arrangement of parts may be resorted to, without departing from the spirit of the invention or the scope of the subjoined claims.
What I claim as my invention is:
1. In atracer having a stylus adapted to bear against a pattern, means for vibrating the stylus comprising a mass rotatably mounted on the stylus and unbalanced about its centre of rotation, and means for rotating said mass.
2. In a tracer having a stylus adapted to bear against a pattern, means for vibrating the stylus comprising a mass rotatably mounted on the stylus and unbalanced about its centre of rotation, and means for rotating the mass including a nozzle arranged to direct a flow of fluid which impinges on the rotatable mass eccentrically of its centre of rotation.
3. In a tracer having a stylus adapted to bear against a pattern, means for vibrating the stylus 4 comprising an endless race mounted on the stylus, a rollable body adapted to travel in the race, and means for causing the rollable body to travel in the race, including a nozzle arranged to direct a flow of fluid on the rollable body.
4. In a tracer having a stylus adapted to bear against a pattern, means for vibrating the stylus comprising an annular race mounted on the stylus and having the stylus as its centre, a rollable body adapted to travel in the race, and means for causing the rollable body to travel in the race, including a collar mounted on the stylus adjacent the race, a conduit in the collar having one end connected to a supply of fluid under pressure and its other end being open and directed in the race to eject a flow of fluid which impinges on the rollable body.
5. In a tracer having a stylus adapted to bear against a pattern, means for vibrating the stylus comprising an annular race mounted on the stylus and having the stylus as its centre, a rollable body adapted to travel in the race, and means for causing the rollable body to travel in the race, including a collar mounted on the stylus adjacent the race, a chamber in the collar and connected to a supply of fluid under pressure, a helical conduit in the collar coiled around the stylus and having one end connected to the chamber and its other end opening into the race for directing a flow of fluid into the race to roll the rollable .body in the race around the stylus.
6. In atracer, having a stylus adapted to bear against a pattern, means for vibrating the stylus com-prisingan unbalanced wheel. mounted on the stylus and means for rotating the wheel about the stylus.
7. In a tracer having a stylus adapted to bear against a pattern, means for vibrating the stylus comprising a turbine wheel rotatably mounted on the stylus which provides its axis of rotation, and a nozzle arranged to direct a flow of fluid. on the wheel to rotate it about the stylus. V
LAWRENCE EDGAR MARCHANT,
-No references cited.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US125204A US2539027A (en) | 1949-11-03 | 1949-11-03 | Vibrating tracer stylus |
CH295465D CH295465A (en) | 1949-11-03 | 1950-10-17 | Device for imparting vibrations to a feeler member of a reproducing machine. |
GB25760/50A GB671525A (en) | 1949-11-03 | 1950-10-23 | Vibrating tracer stylus for copy-milling and like machines |
DEC3359A DE876523C (en) | 1949-11-03 | 1950-10-31 | Vibrating feeler pen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US125204A US2539027A (en) | 1949-11-03 | 1949-11-03 | Vibrating tracer stylus |
Publications (1)
Publication Number | Publication Date |
---|---|
US2539027A true US2539027A (en) | 1951-01-23 |
Family
ID=22418643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US125204A Expired - Lifetime US2539027A (en) | 1949-11-03 | 1949-11-03 | Vibrating tracer stylus |
Country Status (4)
Country | Link |
---|---|
US (1) | US2539027A (en) |
CH (1) | CH295465A (en) |
DE (1) | DE876523C (en) |
GB (1) | GB671525A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2753764A (en) * | 1950-11-23 | 1956-07-10 | Power Jets Res & Dev Ltd | Profile copying machines |
US2821023A (en) * | 1953-10-02 | 1958-01-28 | Barden Corp | Curvature gauge |
US3319340A (en) * | 1964-11-27 | 1967-05-16 | Pipe Machinery Company | Profile indicator and recorder |
US3777616A (en) * | 1971-12-22 | 1973-12-11 | J Mueller | Controlled cutting |
US3824893A (en) * | 1971-07-07 | 1974-07-23 | Dea Spa | Tridimensional universal tracer, slidable on air bearings, for continuous, high-speed copying of profiles of models |
US4842454A (en) * | 1986-04-23 | 1989-06-27 | Gustavsson Axel G V | Method and an arrangement for the preparation of insert bodies for the artificial rebuilding of teeth and human limbs, etc. |
US5383752A (en) * | 1991-11-17 | 1995-01-24 | Liconic Ag | Apparatus for making dental replacements |
-
1949
- 1949-11-03 US US125204A patent/US2539027A/en not_active Expired - Lifetime
-
1950
- 1950-10-17 CH CH295465D patent/CH295465A/en unknown
- 1950-10-23 GB GB25760/50A patent/GB671525A/en not_active Expired
- 1950-10-31 DE DEC3359A patent/DE876523C/en not_active Expired
Non-Patent Citations (1)
Title |
---|
None * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2753764A (en) * | 1950-11-23 | 1956-07-10 | Power Jets Res & Dev Ltd | Profile copying machines |
US2821023A (en) * | 1953-10-02 | 1958-01-28 | Barden Corp | Curvature gauge |
US3319340A (en) * | 1964-11-27 | 1967-05-16 | Pipe Machinery Company | Profile indicator and recorder |
US3824893A (en) * | 1971-07-07 | 1974-07-23 | Dea Spa | Tridimensional universal tracer, slidable on air bearings, for continuous, high-speed copying of profiles of models |
US3777616A (en) * | 1971-12-22 | 1973-12-11 | J Mueller | Controlled cutting |
US4842454A (en) * | 1986-04-23 | 1989-06-27 | Gustavsson Axel G V | Method and an arrangement for the preparation of insert bodies for the artificial rebuilding of teeth and human limbs, etc. |
US5383752A (en) * | 1991-11-17 | 1995-01-24 | Liconic Ag | Apparatus for making dental replacements |
Also Published As
Publication number | Publication date |
---|---|
CH295465A (en) | 1953-12-31 |
DE876523C (en) | 1953-05-15 |
GB671525A (en) | 1952-05-07 |
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