Patent US3826169A successfully refreshed from Google Patents.
US3826169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cut-off knife for corrugators
Assignee: Beazer East Inc
•
Filing: 1973-08-03
•
Granted: 1974-07-30
•
Expires: 1993-08-03
Abstract
Abstract A cut-off knife for corrugators with at least one rotating knife bar for subdividing a web into sheets to which driving rotary motion is provided by a variable adjustable speed control gear and by a subsequently connected differential gear wherein the adjusting mechanisms of the speed control gear and the differential gear are not mechanically connected with one another. The control range of the speed control gear is subdivided into individual sections with each section producing a nominal-value signal; the differential gear is adjusted to provide an actual-value signal for each adjustment. The difference between the nominal and the actual value signals form an output signal that controls the adjustment of the differential gear until the actual-value signal matches the nominal-value signal. The adjustment of the differential gear is preferably automatically controlled with the aid of the difference between the nominal-value signal and the actual-value signal so that the knife speed can be conformed to the speed of the web of material during operation.
Inventors
- 👤 G Schnell
- 👤 K Hohage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:05
CPC Classifications
B; B26; B26D; B26D1/00; B26D1/56; B26D1/62; B26D1/626; B23; B23D; B23D36/00; B23D36/0008; B23D36/0033; B23D36/0041; Y; Y10; Y10T; Y10T83/00; Y10T83/141; Y10T83/148; Y10T83/465; Y10T83/4766; Y10T83/4775
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
202 words
A cut-off knife including at least one rotatable cutter knife bar for cutting a web of paperboard into individual sheets comprising: a variably adjustable gear means including a selectively operable first adjustment means for adjusting an output of said adjustable gear means to drive said knife bar at a substantially constant speed corresponding in proportion to the length of saiD sheets to be cut from said web, said first adjustment means including a plurality of individual control sections each producing a nominal-value voltage signal corresponding to the sheet length selected; an adjustable differential gear means coupled between said variably adjustable gear means and said knife bar including an automatically operable second adjustment means for adjusting said differential gear means independently of said first adjustment means to accelerate or decelerate said knife bar to a speed substantially corresponding to the speed of said web during cutting thereof, said second adjustment means producing an actual-value voltage signal corresponding to the speed of said knife bar during cutting of said web; and a control network responsive to a difference between said nominal and actual-value voltage signals for automatically adjusting said differential gear means through said second adjustment means until said signals substantially correspond in value.
Claim 2
Dependent Claim
202 words
A cut-off knife including at least one rotatable cutter knife bar for cutting a web of paperboard into individual sheets comprising: a variably adjustable gear means including a selectively operable first adjustment means for adjusting an output of said adjustable gear means to drive said knife bar at a substantially constant speed corresponding in proportion to the length of saiD sheets to be cut from said web, said first adjustment means including a plurality of individual control sections each producing a nominal-value voltage signal corresponding to the sheet length selected; an adjustable differential gear means coupled between said variably adjustable gear means and said knife bar including an automatically operable second adjustment means for adjusting said differential gear means independently of said first adjustment means to accelerate or decelerate said knife bar to a speed substantially corresponding to the speed of said web during cutting thereof, said second adjustment means producing an actual-value voltage signal corresponding to the speed of said knife bar during cutting of said web; and a control network responsive to a difference between said nominal and actual-value voltage signals for automatically adjusting said differential gear means through said second adjustment means until said signals substantially correspond in value.
Claim 3
Dependent Claim
101 words
The cut-off knife of claim 1 wherein: said first adjustment means comprises stepping switch means coupled to said variably adjustable gear means and to a resistance network for producing said nominal-value voltage signal; said second adjustment means includes a series parallel potentiometer means coupled to said differential gear means for producing said actual-value voltage signal; and said control network includes a differentiating amplifier means responsive to said nominal and actual-value voltage signals for producing a corrective output signal; and in addition, servomotor means coupled to said second adjustment means and responsive to said output signal for adjusting said differential gear means.
Claim 4
Dependent Claim
33 words
The cut-off knife of claim 2 wherein: said first adjustment means comprises decade switch means coupled to said variably adjustable gear means and to a resistance network for producing said nominal-value voltage signal.
Claim 5
Dependent Claim
49 words
The cut-off knife of claim 2 further including: stop means for clamping said differential gear means in an operating position corresponding to a substantially zero difference in value between said nominal and actual-value voltage signals and for disconnecting said servomotor means from an energy source for said servomotor means.
Claim 6
Dependent Claim
30 words
The cut-off knife of claim 4 wherein: said stop means braces said second adjustment means against inertial forces imposed thereon by acceleration and deceleration forces from said rotating knife bar.
Claim 7
Dependent Claim
24 words
The cut-off knife of claim 1 wherein: said differential gear means includes articulated crank means connecting said differential gear means to said knife bar.
Claim 8
Dependent Claim
24 words
The cut-off knife of claim 1 wherein: said differential gear means includes crank slide means connecting said differential gear means to said knife bar.
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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |