US3912434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for adjusting the position of cutter blades relative to a die in a plastic resin pelletizing apparatus
Assignee: Japan Steel Works Ltd
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Filing: 1974-09-04
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Granted: 1975-10-14
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Expires: 1994-09-04
Abstract
Abstract The position of cutter blades relative to a die in a pelletizing apparatus is adjusted in such a manner that during the advancement of the rotating cutter blades towards the die, when the cutter blades come into contact with the surface of the die, electrical signal pulses are produced, which in turn make the cutter blades move further forward or rewards until a predetermined relative position between the cutter blades and the die is attained.
Inventors
- 👤 Masao Nagahara
- 👤 Masateru Tatsudan
- 👤 Yoshihiro Hidaka
- 👤 Minoru Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:55
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/02; B29B9/06; B29B9/065; B23; B23D; B23D36/00; B26; B26D; B26D7/00; B26D7/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
A method for adjusting the position of cutter blades relative to a die in a plastic resin pelletizing apparatus comprising advancing said cutter blades towards said die during the rotation of said cutter blades while they are separated from each other, detecting electrically the contact of the cutting edges of said cutter blades with the surface of said die, and applying a predetermined compressive force to said cutter blades or retracting said cutter blades by a predetermined distance upon confirming the contact of the cutting edges of said cutting blades with the surface of said die by said electrical ditection.
Claim 2
Independent Claim
100 words
A method for adjusting the position of cutter blades relative to a die in a plastic resin pelletizing apparatus comprising advancing said cutter blades towards said die during the rotation of said cutter blades while they are separated from each other, detecting electrically the contact of the cutting edges of said cutter blades with the surface of said die, and applying a predetermined compressive force to said cutter blades or retracting said cutter blades by a predetermined distance upon confirming the contact of the cutting edges of said cutting blades with the surface of said die by said electrical ditection.
Claim 3
Independent Claim
170 words
An apparatus for adjusting the position of cUtter blades relative to a die in a plastic resin pelletizing apparatus comprising cutter blades resiliently secured to one end of a cutter shaft so as to be allowed relative axial movement thereto, means to rotate said cutter shaft, shifting means to shift said cutter shaft axially towards said die at a relatively slow speed, electrode means provided in said die to detect the contact of the cutting edges of said cutter blades with the surface of said die, signal transducer means to produce electrical signal pulses upon said contact of the cutting edges of said cutter blades, measuring means to measure the axial movement of said cutter shaft upon receipt of said electrical signal pulses from said signal transducer means, and setting means to set a desired axial movement of said cutter shaft, said setting means being made to associate with said measuring means to stop said shifting means when said measuring means detect the desired axial movement of said cutter shaft.
Claim 4
Independent Claim
170 words
An apparatus for adjusting the position of cUtter blades relative to a die in a plastic resin pelletizing apparatus comprising cutter blades resiliently secured to one end of a cutter shaft so as to be allowed relative axial movement thereto, means to rotate said cutter shaft, shifting means to shift said cutter shaft axially towards said die at a relatively slow speed, electrode means provided in said die to detect the contact of the cutting edges of said cutter blades with the surface of said die, signal transducer means to produce electrical signal pulses upon said contact of the cutting edges of said cutter blades, measuring means to measure the axial movement of said cutter shaft upon receipt of said electrical signal pulses from said signal transducer means, and setting means to set a desired axial movement of said cutter shaft, said setting means being made to associate with said measuring means to stop said shifting means when said measuring means detect the desired axial movement of said cutter shaft.
Claim 5
Dependent Claim
48 words
An apparatus for adjusting the position of cutter blades relative to a die in a plastic resin pelletizing apparatus as claimed in claim 2, wherein said cutter shaft is further provided with means for it to moves axially relative to said shifting means at a relatively higher speed.
Claim 6
Dependent Claim
103 words
An apparatus for adjusting the position of cutter blades relative to a die in a plastic resin pelletizing apparatus as claimed in claim 2, wherein said shifting means comprise an intermediate bearing sleeve rotatably supporting said cutter shaft, a worm wheel the hollow boss of which engages with the outer surface of said intermediate bearing sleeve through a screw thread engagement, a worm meshing with said worm wheel, and a prime mover to rotate said worm in either direction, whereby said worm wheel is held in the housing of said pelletizing apparatus so as to allow its axial movement, but prevent its rotation.
Claim 7
Dependent Claim
77 words
An apparatus for adjusting the position of cutter blades relative to a die in a plastic resin pelletizing apparatus as claimed in claim 2, wherein said electrode means are one or more electrodes each embedded in the body of said die on the same circumference as die nozzles of said die with one end being made to be flush with the outer surface of said die, said electrodes being electrically insulated from the body of said die.
References Cited (Backward Citations)
US3832114A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |