US3960079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary printing press
Assignee: Nebiolo SpA
•
Filing: 1974-07-15
•
Granted: 1976-06-01
•
Expires: 1994-07-15
Abstract
Abstract A rotary printing press for printing single sheets has a transfer drum for conveying sheets singly from a feeder table to the periphery of a printing drum rotating at a constant velocity. To make up for the lag introduced between the tail end of each sheet and the leading edge of the next following sheet as the latter is picked up from the feeder table, the transfer drum in carrying the sheet to the printing drum accelerates the sheet to a speed greater than the peripheral speed of the printing drum before slowing the sheet down to the peripheral speed of the printing drum prior to transfer of the sheet to the latter.
Inventors
- 👤 Federico Capetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:24
CPC Classifications
B; B41; B41F; B41F21/00; B41F21/04; B41F21/05; B65; B65H; B65H2405/00; B65H2405/50; B65H2405/53; B65H2405/531
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
345 words
A rotary printing press for single sheets of the type comprising a rotary printing cylinder, means for driving the printing cylinder at a constant velocity, a feeder table onto which the sheets are fed partly overlapping, means on the feeder table for setting the sheets in register frontally and laterally, a rotary transfer drum having a diameter larger than the diameter of said cylinder, means driving the transfer drum at an angular velocity which varies periodically with a period equal to the time taken by the printing cylinder to make one complete revolution, oscillating transfer means having gripping means for transferring the sheets from the feeder table to the transfer drum and means for transferring the sheets from the transfer drum to said printing cylinder, wherein the improvement comprises elliptical gear means operatively disposed intermediate said printing cylinder and said transfer drum, said elliptical gear means being sized to impart to the transfer drum a peripheral velocity which varies from a minimum value substantially equal to the constant peripheral velocity of the printing cylinder to a maximum velocity which is higher than said minimum value and higher than the peripheral velocity of the printing cylinder, cam means mounted on the axis of said printing cylinder for driving said oscillating transfer means, said cam means being rotationally oriented relative to the printing cylinder such that the transfer means is moved from a stop position adjacent said feeder table, at which time said gripper means picks up a sheet from said feeder table, to a velocity greater than the peripheral velocity of said printing cylinder adjacent to said transfer drum prior to the transfer drum reaching its maximum velocity and additional gripping means on said transfer drum for receiving a sheet from said oscillating transfer means when the velocities of said transfer drum and said oscillating transfer means are equal and means to render said means for transferring the sheets from said transfer drum to said printing cylinder operative when the peripheral velocity of said transfer drum is equal to the peripheral velocity of said printing cylinder.
Claim 2
Dependent Claim
345 words
A rotary printing press for single sheets of the type comprising a rotary printing cylinder, means for driving the printing cylinder at a constant velocity, a feeder table onto which the sheets are fed partly overlapping, means on the feeder table for setting the sheets in register frontally and laterally, a rotary transfer drum having a diameter larger than the diameter of said cylinder, means driving the transfer drum at an angular velocity which varies periodically with a period equal to the time taken by the printing cylinder to make one complete revolution, oscillating transfer means having gripping means for transferring the sheets from the feeder table to the transfer drum and means for transferring the sheets from the transfer drum to said printing cylinder, wherein the improvement comprises elliptical gear means operatively disposed intermediate said printing cylinder and said transfer drum, said elliptical gear means being sized to impart to the transfer drum a peripheral velocity which varies from a minimum value substantially equal to the constant peripheral velocity of the printing cylinder to a maximum velocity which is higher than said minimum value and higher than the peripheral velocity of the printing cylinder, cam means mounted on the axis of said printing cylinder for driving said oscillating transfer means, said cam means being rotationally oriented relative to the printing cylinder such that the transfer means is moved from a stop position adjacent said feeder table, at which time said gripper means picks up a sheet from said feeder table, to a velocity greater than the peripheral velocity of said printing cylinder adjacent to said transfer drum prior to the transfer drum reaching its maximum velocity and additional gripping means on said transfer drum for receiving a sheet from said oscillating transfer means when the velocities of said transfer drum and said oscillating transfer means are equal and means to render said means for transferring the sheets from said transfer drum to said printing cylinder operative when the peripheral velocity of said transfer drum is equal to the peripheral velocity of said printing cylinder.
Claim 3
Dependent Claim
106 words
A printing press as set forth in claim 1 wherein the gripping means for transferring the sheets from the feeder table to the transfer drum are comprised of lever grippers adapted to remove each sheet from the feeder table and move each sheet in a trajectory which is tangential at one point to said transfer drum at which point said additional gripping means on said transfer drum are adapted to grip each sheet carried by said lever grippers, and further including drive means for moving said lever grippers in proper timed relation with the rotation of said transfer drum and oscillation of said oscillating transfer means.
Claim 4
Dependent Claim
91 words
A printing press as set forth in claim 2 wherein the elliptical gear means for imparting to the transfer drum a periodically varying peripheral velocity comprises a pair of identical elliptical meshing gears each rotatable about one of its foci and including means securing one of said gears to the transfer drum for rotation therewith, a shaft, means for rotating said shaft at a constant angular velocity equal to that of the printing cylinder and means coupling said shaft to the other of said meshing elliptical gears to drive the latter.
Claim 5
Dependent Claim
33 words
A printing press as set forth in claim 3 and including plurality of cylindrical meshing gears having an overall transmission ratio of unity drivingly interconnecting said shaft and said elliptical gear driven thereby.
References Cited (Backward Citations)
US1837241A
Cited
US2027818A
Cited
US2011744A
Cited
US2127568A
Cited
US2084783A
Cited
US2170489A
Cited
US2164549A
Cited
US2143514A
Cited
US2192916A
Cited
US2210573A
Cited
US2248079A
Cited
US2372783A
Cited
US2699333A
Cited
US2841391A
Cited
US3201115A
Cited
US3596903A
Cited
US3461798A
Cited
US3772990A
Cited
US3832944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |