US3854837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and means for performing a method for controlled deep hole drilling
Assignee: BRIDGEPORT MACHINES Inc A CORP OF
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Filing: 1973-02-23
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Granted: 1974-12-17
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Expires: 1993-02-23
Abstract
Abstract A quill is advanced or withdrawn from work using at least rates for such movement in accordance with control means for determining the direction and speed of rotation of a step motor. Sequence control means is responsive to successive inputs indicative of the end of a sequence step in order to initiate the change to the next sequence. The successive outputs resulting from the successive inputs to the sequence control means set up conditions for operation of the next sequence and, when appropriate to the sequence, actuate direction control means to modify the direction of rotation or the pulse rate control means to modify the feed pulse rate to the step motor.
Inventors
- 👤 M Kreithen
- 👤 J Lawler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:26
CPC Classifications
B; B23; B23Q; B23Q15/00; G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; G05B19/4166; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41326; G05B2219/45; G05B2219/45129; G05B2219/49; G05B2219/49047; Y; Y10; Y10T; Y10T408/00; Y10T408/23
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
381 words
The means for performing a method of drilling deep holes using a step motor drive quill comprising a pulse rate control for supplying pulses to the step motor providing at least two pulse rates, a slower rate for drilling and a faster rate for advance to work, withdrawal and reinsertions of the drill, a direction control controlling the direction of rotation of the step motor, a sequence control in which a predetermined pattern of drilling a hole is established and which at appropriate times acts upon the direction control and the pulse rate control to change direction and change pulse rates, respectively, and position control consisting of at least two counters responding to pulses from the step motor and including a down counter counting cumulatively actual hole depth achieved from pulses at the slow rate, an up/down counter counting pulses down as positive and pulses up as negative and being capable of modification in accordance with program from the sequence control whereby the sequence control determines the order in which action occurs, the step motor advances the quill a predetermined amount into the work from a starting point at said slower rate appropriate for drilling into the work, both counters accumulate a count of pulses used to drive said step motor representative of the hole depth drilLed until a predetermined depth is reached, the sequence control reverses direction and speed of the step motor for withdrawing the quill away from the work, the up/down counter counts pulses driving the motor to the starting point at the more rapid rate a distance represented by said accumulated count, at the start point the sequence control reverses motor direction for returning the quill at said more rapid rate to the point of furtherest drilling advance as represented by said accumulated count, at the furtherest drilling advance the sequence control changes speed for advancing the quill at said drilling rate adding to the accumulated count in the counters as drilling proceeds until either a predetermined depth or the full desired depth of the hole is reached, the sequence is repeated adding a predetermined drilling depth each cycle until full hole depth is achieved, and when the full desired depth is reached by comparison with the down counter the quill is withdrawn to the starting point.
Claim 2
Dependent Claim
381 words
The means for performing a method of drilling deep holes using a step motor drive quill comprising a pulse rate control for supplying pulses to the step motor providing at least two pulse rates, a slower rate for drilling and a faster rate for advance to work, withdrawal and reinsertions of the drill, a direction control controlling the direction of rotation of the step motor, a sequence control in which a predetermined pattern of drilling a hole is established and which at appropriate times acts upon the direction control and the pulse rate control to change direction and change pulse rates, respectively, and position control consisting of at least two counters responding to pulses from the step motor and including a down counter counting cumulatively actual hole depth achieved from pulses at the slow rate, an up/down counter counting pulses down as positive and pulses up as negative and being capable of modification in accordance with program from the sequence control whereby the sequence control determines the order in which action occurs, the step motor advances the quill a predetermined amount into the work from a starting point at said slower rate appropriate for drilling into the work, both counters accumulate a count of pulses used to drive said step motor representative of the hole depth drilLed until a predetermined depth is reached, the sequence control reverses direction and speed of the step motor for withdrawing the quill away from the work, the up/down counter counts pulses driving the motor to the starting point at the more rapid rate a distance represented by said accumulated count, at the start point the sequence control reverses motor direction for returning the quill at said more rapid rate to the point of furtherest drilling advance as represented by said accumulated count, at the furtherest drilling advance the sequence control changes speed for advancing the quill at said drilling rate adding to the accumulated count in the counters as drilling proceeds until either a predetermined depth or the full desired depth of the hole is reached, the sequence is repeated adding a predetermined drilling depth each cycle until full hole depth is achieved, and when the full desired depth is reached by comparison with the down counter the quill is withdrawn to the starting point.
Claim 3
Dependent Claim
48 words
The means for performing a method of drilling deep holes of claim 1 in which the means for determining when the full desired depth is reached is a count comparator which compares the accumulated count representative of actual hole depth with a count representative of desired hole depth.
Claim 4
Dependent Claim
56 words
The means for performing a method of deep hole drilling of claim 1 in which the predetermined amount toward the work at a relatively slow rate is determined by means which includes a timer for timing out the period that it takes to drill the desired predetermined amount at said relatively slow rate appropriate for drilling.
Claim 5
Dependent Claim
65 words
The means for performing a method of drilling deep holes of claim 1 in which the predetermined amount toward the work at a relatively slow rate is determined by means which includes counter means for counting pulses used to drive said step motor when proceeding at a relatively slow rate appropriate for drilling, and means for terminating drilling when the count reaches a predetermined level.
Claim 6
Dependent Claim
26 words
The means for performing the method of claim 1 in which only two rates of advancing and withdrawing the quill are produced by two pulse rates.
Claim 7
Dependent Claim
195 words
A deep hole drilling control device for a drilling machine tool employing at least a quill for driving a drill into or away from work and movable on the frame of the machine tool for this purpose, quill step motor means for moving said quill toward and away from work, and motor control means for said quill step motor through which direction of movement and speed of said quill step motor are obtained, comprising a pulse generator connected to said motor control means for generating pulses for moving said step motor, pulse rate control means associated with the pulse generator to determine the rate of pulse generation including a selected rate for drilling and at least one more rapid rate, sequence control means for actuating the control means in predetermined sequence to modify direction of rotation and to modify by the pulse rate control means the feed pulse rate to the step motor, pulse counter means to count pulses driving said step motor in each step of the sequence, and count responsive means actuated by predetermined count conditions to actuate the sequence control means to produce a predetermined sequence of operation of said step motor.
Claim 8
Dependent Claim
195 words
A deep hole drilling control device for a drilling machine tool employing at least a quill for driving a drill into or away from work and movable on the frame of the machine tool for this purpose, quill step motor means for moving said quill toward and away from work, and motor control means for said quill step motor through which direction of movement and speed of said quill step motor are obtained, comprising a pulse generator connected to said motor control means for generating pulses for moving said step motor, pulse rate control means associated with the pulse generator to determine the rate of pulse generation including a selected rate for drilling and at least one more rapid rate, sequence control means for actuating the control means in predetermined sequence to modify direction of rotation and to modify by the pulse rate control means the feed pulse rate to the step motor, pulse counter means to count pulses driving said step motor in each step of the sequence, and count responsive means actuated by predetermined count conditions to actuate the sequence control means to produce a predetermined sequence of operation of said step motor.
Claim 9
Dependent Claim
41 words
The deep hole drilling control device of claim 6 in which timer means is employed to time the drilling step of each sequence and to terminate that step and initiate the next step of the sequence through the sequence control means.
Claim 10
Dependent Claim
43 words
The deep hole drilling control device of claim 7 in which the timer means is started by position logic when the tool is in proper drilling position or by the sequence control as each sequence terminates and a new sequence is to begin.
Claim 11
Dependent Claim
22 words
The deep hole drilling control device of claim 8 in which the timer may be selectively set for any desired drilling period.
Claim 12
Dependent Claim
34 words
The deep hole drilling contRol device of claim 6 in which the period in the drilling sequence is determined by comparison of a pulse count with a predetermined count representing the desired drilling increment.
Claim 13
Dependent Claim
88 words
The deep hole drilling control device of claim 10 in which the desired count is stored in a storage register and transferred into a down-counter upon the occurrence of the beginning of a sequence either from initial tool positioning or repetition of the sequence and counter zero detection means is provided to determine when the down-counter has been counted to zero by the pulses driving the quill motor, said counter zero detector acting to terminate the drilling sequence and initiate the next sequence through the drilling control logic.
Claim 14
Dependent Claim
42 words
The deep hole drilling control device of claim 6 in which a counter counting only the drilling pulses is provided and in which drilling operation is terminated at any time in the sequence when a predetermined count is reached by said counter.
Claim 15
Dependent Claim
79 words
The deep hole drilling control device of claim 12 in which gate means is provided to provide the counter only with pulses during the drill step of the sequence, the counter is a down-counter, means is provided to set the counting at a predetermined count representative of total desired hole depth and counter zero detector means determines when the counter has reached 0 and produces a signal to end the drilling and return the quill to the starting position.
Claim 16
Dependent Claim
40 words
The deep hole drilling control device of claim 13 in which the count is put into the down-counter from a register upon suitable signal from a drill position logic indicating that the drill is in place ready to begin drilling.
Claim 17
Dependent Claim
21 words
The deep hole drilling control device of claim 12 in which the count is set into the down-counter by manual means.
Claim 18
Dependent Claim
51 words
The deep hole drilling control device of claim 6 in which an up-down counter is provided with suitable gating means allowing it to be counted up by drilling pulses and counted down by other pulses and a counter zero detection device causes an output to terminate the sequence of rapid retraction.
Claim 19
Dependent Claim
69 words
The deep hole drilling control device of claim 16 in which a storage register and transfer logic are provided whereby down counts may be accumulated in a storage register and transferred back into the up/down counter at the end of the sequence when the drill is withdrawn in order to permit that count to be counted down to zero as the drill is being rapidly reinserted prior to drilling.
Claim 20
Dependent Claim
68 words
The deep hole drilling control device of claim 17 in which the storage register has its storage count transferred back to the counter at the end of each drill withdrawal by virtue of a suitable signal to the transfer logic from the sequence control and in which all up-counts pass to the storage register so that it accumulates the total drilled depth of the hole in its memory.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |