US3710659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatically controlled tool holding device
Assignee: Olivetti SpA
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Filing: 1970-03-02
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Granted: 1973-01-16
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Expires: 1990-03-02
Abstract
Abstract A tool holding device wherein the tool is slideably supported in the holder in order to enable a radial motion with respect to the axis of rotation of the holding device to be described. Control of the holder is effected by a control circuit which rapidly positions the tool for commencement of the machining operation and then controls the tool more slowly during the machining operation. A step motor is used as the motion source and is controlled directly by the control circuit.
Inventors
- 👤 E Pagella
- 👤 C Guerci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:50
CPC Classifications
B; B23; B23B; B23B29/00; B23B29/03; B23B29/034; B23B29/03432; B23B29/03435; B23Q; B23Q1/00; B23Q1/0009; B23Q5/00; B23Q5/02; B23Q5/04; B23Q5/043; B23B2229/00; B23B2229/16; Y; Y10; Y10T; Y10T82/00; Y10T82/12; Y10T82/25; Y10T82/2529
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
256 words
A tool holding device for a boring and facing machine comprising: a rotatable body member mounted on said machine, a tool slide carried by said body member and movable radially with respect to said body member, said tool being secured to said slide, a reversible electric motor fixedly mounted on said body member for moving said slide radially, said motor being of the type rotatable step-wise in response to pulsed signals corresponding to the number of steps of rotation and having a shaft coaxial with the axis of rotation of said body member, a worm and nut assembly driven by said shaft and connecting said motor to said slide for imparting radial motion to said slide, said worm and nut assembly comprising: a nut fixed to said slide, a worm screw perpendicular to said nut and engaged therewith, a cylindrical portion integral with said worm screw and supported for rotation, said cylindrical portion being constrained against linear motion by at least one bearing mounted on said body member, a threaded portion on said shaft, a worm wheel secured to said worm screw between said worm screw and said cylindrical portion, said worm wheel being coupled to said threaded portion and driven thereby, and a control circuit for controlling said motor, said control circuit comprising at least one pulse generator for actuating said motor, a digital setting device connected to said pulse generator for energizing said pulse generator, and a direction control device connected to said pulse generator for defining the direction of rotation of said motor.
Claim 2
Dependent Claim
256 words
A tool holding device for a boring and facing machine comprising: a rotatable body member mounted on said machine, a tool slide carried by said body member and movable radially with respect to said body member, said tool being secured to said slide, a reversible electric motor fixedly mounted on said body member for moving said slide radially, said motor being of the type rotatable step-wise in response to pulsed signals corresponding to the number of steps of rotation and having a shaft coaxial with the axis of rotation of said body member, a worm and nut assembly driven by said shaft and connecting said motor to said slide for imparting radial motion to said slide, said worm and nut assembly comprising: a nut fixed to said slide, a worm screw perpendicular to said nut and engaged therewith, a cylindrical portion integral with said worm screw and supported for rotation, said cylindrical portion being constrained against linear motion by at least one bearing mounted on said body member, a threaded portion on said shaft, a worm wheel secured to said worm screw between said worm screw and said cylindrical portion, said worm wheel being coupled to said threaded portion and driven thereby, and a control circuit for controlling said motor, said control circuit comprising at least one pulse generator for actuating said motor, a digital setting device connected to said pulse generator for energizing said pulse generator, and a direction control device connected to said pulse generator for defining the direction of rotation of said motor.
Claim 3
Dependent Claim
52 words
The tool holding device of claim 1 wherein said pulse generator rapidly rotates said motor, and further comprising a second pulse generator for less rapidly rotating said motor, and means for selectively switching control of rotation of said motor from one of said pulse generators to the other of said pulse generators.
Claim 4
Dependent Claim
55 words
The control circuit of claim 2 further including manual setting means for setting the magnitude and direction of rotation of said motor, said manual setting means including at least two operational modes which are sequentially completed so that said first mode can be changed to a third mode during the running of said second mode.
Claim 5
Dependent Claim
55 words
The control circuit of claim 3 further including a counter, said counter receiving the input to said motor, and the output of said counter being injected into said manual setting means so that said setting means actuates said switching means when the input to said motor equals the preset setting of said manual setting means.
Claim 6
Dependent Claim
37 words
The control circuit of claim 4 wherein said switching means includes a bistable switching circuit associated with each of said pulse generators, said bistable switching circuits being selectively actuated by the output of said manual setting means.
Claim 7
Dependent Claim
34 words
The control circuit of claim 5 further comprising; variable voltage input means to said pulse generators for controlling the rotational speed of said motor by controlling the pulse repetition frequency of said pulse generators.
Claim 8
Dependent Claim
24 words
The control circuit of claim 6 further including manual switching means for overriding said pulse generators to thereby enable manual control of said motor.
Claim 9
Dependent Claim
39 words
The fool holding device of claim 1 further comprising: a collar arranged on the end of said worm screw adjacent to said worm wheel, so that said nut can abut against said collar before starting a predetermined machining cycle.
Claim 10
Dependent Claim
118 words
The tool holding device of claim 1 further comprising: a support fixedly attached to said machine and coaxial with said body member, said support supporting said body member for rotation by means of a plurality of balls interposed between said body member and said support and coacting with seats integral with said support and said body member, a plurality of angular slip rings carried by said body membeR and connected to said motor, and a plurality of contact elements mounted on said support in alignment with said slip rings and in slidable contact therewith, said contact elements being connected to said control circuit, whereby said motor is energized through the coacting said slip rings and said contact elements.
Claim 11
Dependent Claim
33 words
The tool holding device of claim 9 wherein each of said contact elements includes a plunger radially slidable in said support and biased against one of said slip rings by a leaf spring.
Claim 12
Dependent Claim
85 words
The tool holding device of claim 1 wherein said setting device is set according to the dimension that said slide must attain with rapid approach displacement of the tool, and including a second digital setting device connected to a second pulse generator and settable in accordance with the dimension said slide must attain with slow machining displacement, said control circuit further including means for switching the energization of said pulse generators, and a variable potentiometer for controlling the pulse repetition frequencies of said pulse generators.
Claim 13
Dependent Claim
68 words
The tool holding device of claim 11 wherein said means for switching includes at least one flip-flop, adapted to be switched by means of a coincidence circuit controlled by its respective said setting device for rapid displacement, and including a counter arranged to count the pulses feeding said motor and to compare the counted pulses with the respective said setting device connected to the energized said pulse generator.
Claim 14
Dependent Claim
71 words
The tool holding device of claim 1 further comprising a second control circuit similar to said first control circuit, the said digital control devices of each of said control circuit being manually settable, and switching means for alternately connecting said pulse generator with said first and second control circuits to enable the setting of one said digital device during the period when the other said digital device is controlling said motor.
Claim 15
Dependent Claim
92 words
The tool holding device of claim 1 wherein said pulse generator directly feeds said motor to rotate said motor one step for each pulse so fed and said digital setting device is settable according to a predetermined number of pulses for energizing said pulse generator, and further comprising a counter connected to said pulse generator for counting pulses fed to said motor, and comparing means for comparing said predetermined number of pulses set on said setting device with the number of said pulses counted by said counter for controlling said pulse generator.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |