Patent US3911593A successfully refreshed from Google Patents.
US3911593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying oven for printed sheets
Assignee: STORK ARGON MECCANICA Srl
•
Filing: 1974-07-11
•
Granted: 1975-10-14
•
Expires: 1994-07-11
Abstract
Abstract A drying oven for screen-printed sheets has an upright housing divided by a vertical partition into a hot-air chamber and a cold-air chamber. An ascending tray elevator in the hot-air chamber and a descending tray elevator in the cold-air chamber, each comprising two pairs of endless chains, are driven in alternation with a pair of horizontal conveyors at the top and the bottom of the housing whereby trays loaded with sheets to be dried move upwardly in the first chamber, through jets of heated air issuing from an outer wall thereof, and then downwardly in the second chamber through jets of cold air similarly issuing from an outer wall of the latter. The intervening partition serves as a suction duct for aspirating air from both chambers and returning same after heating to the first chamber; the cold air for the second chamber is taken from the surrounding atmosphere.
Inventors
- 👤 Fabio Colapinto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:46
CPC Classifications
F; F26; F26B; F26B15/00; F26B15/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
281 words
A drying oven for printed sheets, comprising: a housing including an upright frame provided with a vertical partition dividing the interior thereof into a first and a second chamber; ascending elevator means in said first chamber and descending elevator means in said second chamber each provided with support for trays having spaced-apart sheet-carrying bars; upper horizontal transport means at the top of said frame for carrying trays in a direction parallel to said bars from said ascending elevator means to said descending elevator means; lower horizontal transport means at the bottom of said housing for carrying trays in a direction parallel to said bars from said descending elevator means to said ascending elevator means; loading means at the bottom of said first chamber for delivering sheets to the trays at the beginning of their ascent; unloading means at the bottom of said second chamber for removing sheets from the trays at the end of their descent, said unloading means including a stripper member rotatable about an axis transverse to said bars and provided with dependent teeth fitting between said bars; first jet means in said first chamber trained uPon the ascending trays and connected to a source of hot air; second jet means in said second chamber trained upon the descending trays and connected to a source of cold air; common drive means for said ascending and descending elevator means and for said upper and lower transport means; detent means yieldably engaging said stripper member for normally holding said teeth in their dependent position; and alarm means responsive to a deflection of said teeth from their dependent position by an extraneous object lodged between said bars for deactivating said drive means.
Claim 2
Dependent Claim
281 words
A drying oven for printed sheets, comprising: a housing including an upright frame provided with a vertical partition dividing the interior thereof into a first and a second chamber; ascending elevator means in said first chamber and descending elevator means in said second chamber each provided with support for trays having spaced-apart sheet-carrying bars; upper horizontal transport means at the top of said frame for carrying trays in a direction parallel to said bars from said ascending elevator means to said descending elevator means; lower horizontal transport means at the bottom of said housing for carrying trays in a direction parallel to said bars from said descending elevator means to said ascending elevator means; loading means at the bottom of said first chamber for delivering sheets to the trays at the beginning of their ascent; unloading means at the bottom of said second chamber for removing sheets from the trays at the end of their descent, said unloading means including a stripper member rotatable about an axis transverse to said bars and provided with dependent teeth fitting between said bars; first jet means in said first chamber trained uPon the ascending trays and connected to a source of hot air; second jet means in said second chamber trained upon the descending trays and connected to a source of cold air; common drive means for said ascending and descending elevator means and for said upper and lower transport means; detent means yieldably engaging said stripper member for normally holding said teeth in their dependent position; and alarm means responsive to a deflection of said teeth from their dependent position by an extraneous object lodged between said bars for deactivating said drive means.
Claim 3
Dependent Claim
64 words
A drying oven as defined in claim 1 wherein said drive means comprises a pair of ganged driving elements and a pair of driven elements respectively coupled with said driving elements for intermittent entrainment thereby in different phases of an operating cycle, one of said driven elements being coupled with said elevator means, the other of said elements being coupled with said transport means.
Claim 4
Dependent Claim
31 words
A drying oven as defined in claim 2 wherein said driven elements are so coupled with said driving elements as to be simultaneously stationary during a fraction of an operating cycle.
Claim 5
Dependent Claim
65 words
A drying oven as defined in claim 1 wherein said source of hot air comprises first blower means for aspirating air from the interior of said housing and driving the aspirated air through a heating zone to said first jet means, said source of cold air comprising second blower means for aspirating air from the surrounding atmosphere and driving same to said second jet means.
Claim 6
Dependent Claim
47 words
A drying oven as defined in claim 4 wherein said partition has a hollow upper section and a hollow lower section open toward both chambers, said first blower means communicating with said upper section for aspirating air therefrom, further comprising vapor-exhaust means communicating with said lower section.
Claim 7
Dependent Claim
40 words
A drying oven as defined in claim 4, further comprising third blower means for aspirating atmospheric air and discharging same downwardly from the top of said frame for holding a sheet onto a tray conveyed by said upper transport means.
Claim 8
Dependent Claim
40 words
A drying oven as defined in claim 1 wherein said trays have sheet-supporting bars spaced apart in a direction said loading means includes an input conveyor with a plurality of spaced-apart endless bands fitting between the bars of said trays.
Claim 9
Dependent Claim
97 words
A drying oven as defined in claim 1 wherein said ascending and descending elevator means each comprises two pairs of endless chains confronting each other, the chains of each pair being bridged by tray-supporting rails, said upper transport means comprising another pair of endless chains with depending lugs engageable from above with an ascending tray, said lower transport means comprising a further pair of endless chains with upstanding lugs engageable from below with a descending tray, the rails of said ascending and descending elevator means being separated by distances substantially less than the length of said rails.
Claim 10
Dependent Claim
250 words
A drying oven for printed sheets, comprising: a housing including an upright frame provided with a vertical partition dividing the interior thereof into a first and a second chamber, said partition having a hollow upper section and a hollow lower section open toward both chambers; ascending elevator means in said first chamber and descending elevator means in said second chamber each provided with supports for sheet-carrying trays; upper horizontal transport means at the top of said frame for carrying trays from said ascending elevator means to said descending elevator means; lower horizontal transport means at the bottom of said housing for carrying trays from said descending elevator means to said ascending elevator means; loading means at the bottom of said first chamber for delivering sheets to the trays at the beginning of their ascent; unloading means at the bottom of said second chamber for removing sheets from the trays at the end of tHeir descent; first blower means communicating with said upper section for aspirating air therethrough from the interior of said housing and driving the aspirated air through a heating zone; first jet means in said first chamber trained upon the ascending trays and connected to said heating zone for receiving hot air therefrom under pressure of said first blower means; second blower means for aspirating cold air from the surrounding atmosphere; second jet means in said second chamber trained upon the descending trays and connected to said second blower means; and vapor-exhaust means communicating with said lower section.
Claim 11
Dependent Claim
250 words
A drying oven for printed sheets, comprising: a housing including an upright frame provided with a vertical partition dividing the interior thereof into a first and a second chamber, said partition having a hollow upper section and a hollow lower section open toward both chambers; ascending elevator means in said first chamber and descending elevator means in said second chamber each provided with supports for sheet-carrying trays; upper horizontal transport means at the top of said frame for carrying trays from said ascending elevator means to said descending elevator means; lower horizontal transport means at the bottom of said housing for carrying trays from said descending elevator means to said ascending elevator means; loading means at the bottom of said first chamber for delivering sheets to the trays at the beginning of their ascent; unloading means at the bottom of said second chamber for removing sheets from the trays at the end of tHeir descent; first blower means communicating with said upper section for aspirating air therethrough from the interior of said housing and driving the aspirated air through a heating zone; first jet means in said first chamber trained upon the ascending trays and connected to said heating zone for receiving hot air therefrom under pressure of said first blower means; second blower means for aspirating cold air from the surrounding atmosphere; second jet means in said second chamber trained upon the descending trays and connected to said second blower means; and vapor-exhaust means communicating with said lower section.
Claim 12
Dependent Claim
251 words
A drying oven for printed sheets, comprising: a housing including an upright frame provided with a vertical partition dividing the interior thereof into a first and a second chamber; ascending elevator means in said first chamber and descending elevator means in said second chamber each provided with supports for sheet-carrying trays; upper horizontal transport means at the top of said frame for carrying trays from said ascending elevator means to said descending elevator means; lower horizontal transport means at the bottom of said housing for carrying trays from said descending elevator means to said ascending elevator means; loading means at the bottom of said first chamber for delivering sheets to the trays at the beginning of their ascent; unloading means at the bottom of said second chamber for removing sheets from the trays at the end of their descent; first blower means for aspirating air from the interior of said housing and driving the aspirated air through a heating zone; first jet means in said first chamber trained upon the ascending trays and connected to said heating zone for receiving hot air therefrom under pressure of said first blower means; second blower means for aspirating cold air from the surrounding atmosphere; second jet means in said second chamber trained upon the descending trays and connected to said second blower means; and third blower means for aspirating atmospheric air and discharging same downwardly from the top of said frame for holding a sheet onto a tray conveyed by said upper transport means.
Claim 13
Dependent Claim
251 words
A drying oven for printed sheets, comprising: a housing including an upright frame provided with a vertical partition dividing the interior thereof into a first and a second chamber; ascending elevator means in said first chamber and descending elevator means in said second chamber each provided with supports for sheet-carrying trays; upper horizontal transport means at the top of said frame for carrying trays from said ascending elevator means to said descending elevator means; lower horizontal transport means at the bottom of said housing for carrying trays from said descending elevator means to said ascending elevator means; loading means at the bottom of said first chamber for delivering sheets to the trays at the beginning of their ascent; unloading means at the bottom of said second chamber for removing sheets from the trays at the end of their descent; first blower means for aspirating air from the interior of said housing and driving the aspirated air through a heating zone; first jet means in said first chamber trained upon the ascending trays and connected to said heating zone for receiving hot air therefrom under pressure of said first blower means; second blower means for aspirating cold air from the surrounding atmosphere; second jet means in said second chamber trained upon the descending trays and connected to said second blower means; and third blower means for aspirating atmospheric air and discharging same downwardly from the top of said frame for holding a sheet onto a tray conveyed by said upper transport means.
References Cited (Backward Citations)
US1502186A
Cited
US1675260A
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 |