US3843871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting breakage of blade of rotary cutter
Assignee: Teijin Ltd
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Filing: 1973-02-14
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Granted: 1974-10-22
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Expires: 1993-02-14
Abstract
Abstract An apparatus is provided for detecting breakage of at least one of blades of a rotary cutter for a tow. The apparatus comprises a first detector which produces a pulse for every pass of a tip of the cutter blade across a predetermined position, a second detector which produces a pulse or the definite number of pulses for every rotation or every definite number of rotations of the rotary cutter, and a discriminator receiving the output pulses from the both detectors to produce an abnormal signal when the number of pulses produced by the first detector during a period of time of the pulses produced by the second detector is smaller than a predetermined value.
Inventors
- 👤 M Fujimaki
- 👤 T Okamoto
- 👤 M Tashiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:03
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/22; H03K5/26; Y; Y10; Y10T; Y10T83/00; Y10T83/081; Y10T83/088; Y10T83/089
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
144 words
An apparatus for detecting broken blades in a rotary cutter for a tow having at least two radially disposed cutter blades, comprising: a first detecting member operatively positioned relative to said rotary cutter for producing a pulse each time a cutter blade passes a predetermined location; a second detecting member operatively positioned relative to said rotary cutter for producing at least one pulse, the exact number thereof being predetermined, for every predetermined number of revolutions of said rotary cutter, said pulses from said second detecting member defining a time period during which the number of pulses produced by said first detector normally reaches the predetermined number; and a discriminator member connected to said first and second detector members and producing an abnormal indication signal when the number of pulses produced by said first detector in said time period is less than the predetermined number.
Claim 2
Independent Claim
144 words
An apparatus for detecting broken blades in a rotary cutter for a tow having at least two radially disposed cutter blades, comprising: a first detecting member operatively positioned relative to said rotary cutter for producing a pulse each time a cutter blade passes a predetermined location; a second detecting member operatively positioned relative to said rotary cutter for producing at least one pulse, the exact number thereof being predetermined, for every predetermined number of revolutions of said rotary cutter, said pulses from said second detecting member defining a time period during which the number of pulses produced by said first detector normally reaches the predetermined number; and a discriminator member connected to said first and second detector members and producing an abnormal indication signal when the number of pulses produced by said first detector in said time period is less than the predetermined number.
Claim 3
Dependent Claim
36 words
An apparatus as claimed in claim 1, wherein said first detector comprises a photoelectric switch having a light-emitting element and an opposing light-receiving element, said elements allowing the tips of the cutter blades to pass through.
Claim 4
Dependent Claim
28 words
An apparatus as claimed in claim 1, wherein said first detector comprises a proximity switch which is magnetically actuated when the tip of said cutter blade approach thereto.
Claim 5
Dependent Claim
39 words
An apparatus as claimed in claim 1, wherein said second detector comprises a ferromagnetic metal piece which rotates with the rotation of said rotary cutter, and a proximity switch which is magnetically actuated when said metal piece approaches thereto.
Claim 6
Dependent Claim
53 words
An apparatus as claimed in claim 1 wherein said second detector comprises a photoelectric switch having a light-emitting element and an opposing light-receiving element, and a light shielding member rotating with the rotation of said rotary cutter and passing between both elements to intermittently interrupt the light received by said light emitting element.
Claim 7
Independent Claim
137 words
An apparatus for detecting breakage of at least one of the blades of a rotary cutter for a tow in which N cutter blades are radially disposed, N being greater than 1, comprising: a first detector which produces a pulse for every pass of a tip of the cutter blade across a predetermined position: a second detector which produces n pulses for every revolution of said rotary cutter, the time interval between successive ones of said n pulses per revolution being a period of time during which one pulse is normally produced by said first detector; and a discriminator receiving the output pulses from the first and second detectors to produce an abnormal indication signal when no pulse is received from said first detector during said period of time between successive pulses produced by said second detector.
Claim 8
Independent Claim
137 words
An apparatus for detecting breakage of at least one of the blades of a rotary cutter for a tow in which N cutter blades are radially disposed, N being greater than 1, comprising: a first detector which produces a pulse for every pass of a tip of the cutter blade across a predetermined position: a second detector which produces n pulses for every revolution of said rotary cutter, the time interval between successive ones of said n pulses per revolution being a period of time during which one pulse is normally produced by said first detector; and a discriminator receiving the output pulses from the first and second detectors to produce an abnormal indication signal when no pulse is received from said first detector during said period of time between successive pulses produced by said second detector.
Claim 9
Dependent Claim
106 words
An apparatus as claimed in claim 6 wherein said discriminator comprises: a flip-flop which receives, as a set input, the output pulse from said second detector and receives, as a reset input, the output pulse from said first detector, and an AND circuit which receives, as inputs, an output rectangular wave from said flip-flop and the output pulse from said second detector, said AND circuit producing a pulse signal only when said flip-flop has already been in a set state but at the time when the output pulse is received from said second detector, said abnormal indication signal being the output pulse of said AND circuit.
Claim 10
Dependent Claim
107 words
An apparatus as claimed in claim 6 wherein said discriminator comprises: a flip-flop which receives, as a trigger input, the output pulse from said second detector, and receives, as a reset input, the output pulse from said first detector, and an AND circuit which receives, as inputs, an output rectangular wave from said flip-flop and the output pulse from said second detector, said AND circuit producing a pulse signal only when said flip-flop is in a state contrary to a reset state but at the time when the output pulse is received from said second detector, said abnormal signal being the output pulse of said AND circuit.
Claim 11
Dependent Claim
106 words
An apparatus as claimed in claim 6, wherein said discriminator comprises: a flip-flop which receives, as a trigger input, the output pulse from said second detector and receives, as a reset input, the output pulse from said first detector, and an AND circuit which receives, as inputs, an output rectangular wave from said flip-flop and the output pulse from said first detector, said AND circuit producing a pulse signal only when said flip-flop has already been in a reset state but at the time when the output pulse is received from said first detector, said abnormal indication signal being the output pulse of said AND circuit.
Claim 12
Independent Claim
136 words
An apparatus for detecting breakage of at least one of blades of a rotary cutter for a tow in which n(an integer of 2 or more) cutter blades are radally disposed, comprising: a first detector which produces a pulse for every pass of a tip of the cutter blade across a predetermined position, a second detector which produces one pulse for every rotation of said rotary cutter, said pulses being produced to have a period of time during which n units of pulses are normally produced by said first detector, and a discriminator receiving the output pulses from said first and second detectors to produce an abnormal indication signal when the number of pulses produced by the first detector during said period of time of said pulses produced by said second detector is smaller than n.
Claim 13
Independent Claim
136 words
An apparatus for detecting breakage of at least one of blades of a rotary cutter for a tow in which n(an integer of 2 or more) cutter blades are radally disposed, comprising: a first detector which produces a pulse for every pass of a tip of the cutter blade across a predetermined position, a second detector which produces one pulse for every rotation of said rotary cutter, said pulses being produced to have a period of time during which n units of pulses are normally produced by said first detector, and a discriminator receiving the output pulses from said first and second detectors to produce an abnormal indication signal when the number of pulses produced by the first detector during said period of time of said pulses produced by said second detector is smaller than n.
Claim 14
Dependent Claim
111 words
An apparatus as claimed in claim 10, wherein said discriminator comprises: a flip-flop which receives the output pulses from said first and said second detectors, respectively, as a trigger input and reset input, and and AND circuit which receives as inputs an output rectangular wave from said flip-flop and the output pulse of said second detector, wherein said AND circuit upon receipt of the pulse from said second detector produces a pulse with said flip-flop either in a state opposite to a reset state or in a reset state, depending on whether n is an even or odd number, said abnormal indication signal being the output pulse of said AND circuit.
Claim 15
Dependent Claim
109 words
An apparatus as claimed in claim 10, wherein said discriminator comprises: a ring counter having n units of flip-flops connected in a ring form, wherein a determined flip-flop is preset to 1 before said second detector produces a first pulse and the other flip-flops are cleared to 0, said ring counter being triggered by the output pulse of said first detector after said second detector has produced the first pulse, and an AND circuit which receives, as inputs, an output rectangular wave contrary to the output of said flip-flop and the output pulse from said second detector, said abnormal indication signal being the output pulse of said AND circuit.
Claim 16
Independent Claim
157 words
An apparatus for detecting breakage of at least one of blades of a rotary cutter for a tow in which n(an integer of 2 or more) cutter blades are radially disposed, comprising: a first detector which produces a pulse for every pass of a tip of the cutter blade across a predetermined position, a second detector which produces one pulse for m(an integer of 2 or more) times of the number of revolutions of said rotary cutter, said pulse being produced to have a period of time during which nm units of pulses are normally produced by said first detector, and a discriminator receiving the output pulses from said first and second detectors to produce an abnormal indication signal when the number of pulses produced by the first detector during the period of time of said pulses produced by said second detEctor is smaller than reference value determined near the center between nm and (n - 1)m.
Claim 17
Independent Claim
157 words
An apparatus for detecting breakage of at least one of blades of a rotary cutter for a tow in which n(an integer of 2 or more) cutter blades are radially disposed, comprising: a first detector which produces a pulse for every pass of a tip of the cutter blade across a predetermined position, a second detector which produces one pulse for m(an integer of 2 or more) times of the number of revolutions of said rotary cutter, said pulse being produced to have a period of time during which nm units of pulses are normally produced by said first detector, and a discriminator receiving the output pulses from said first and second detectors to produce an abnormal indication signal when the number of pulses produced by the first detector during the period of time of said pulses produced by said second detEctor is smaller than reference value determined near the center between nm and (n - 1)m.
Claim 18
Dependent Claim
94 words
An apparatus as claimed in claim 13, wherein said discriminator comprises: a counter which is cleared to 0 by the pulse signal from said second detector and counts the pulse signals produced by said first detector, and a gate circuit which is closed when the counted value of said counter reached said reference value, and is opened when the pulse signal from said second detector has extinguished, and receives, as an input, the pulse from said second detector, said abnormal indication signal being the pulse from said second detector passing through said gate circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |