A printer is operable for image formation onto a sheet of a sheet width Lp, with a sheet spacing Lg and a printing transfer speed Vg, a constant speed transferrer makes sheet transfer at the printing transfer speed Vg from a register via the printer to a speed change position, a variable speed trans
A printer is operable for image formation onto a sheet of a sheet width Lp, with a sheet spacing Lg and a printing transfer speed Vg, a constant speed transferrer makes sheet transfer at the printing transfer speed Vg from a register via the printer to a speed change position, a variable speed transferrer makes sheet transfer from the speed change position to the register, and a transfer controller controls sheet transfer speeds, the variable speed transferrer having sections for sheet transfer, including deceleration and acceleration sections for sheet reversal at the sheet reversing path, and a constant speed section for transfer at a constant transfer speed Vr, the transfer controller determining a circulating sheet number N, executing a calculation of transfer speed Vr employing sheet width Lp, sheet spacing Lg, printing transfer speed Vg, and accelerations, to enable sheet transfer for circulation within a time interval of N×(Lp+Lg)/Vg.
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1. A duplex printing apparatus provided with a circulating transfer route including a sheet reversing path, and configured to transfer a sheet printed on a front side thereof in a circulating manner along the circulating transfer route, reversing front to rear, to make a print on a rear side thereof
1. A duplex printing apparatus provided with a circulating transfer route including a sheet reversing path, and configured to transfer a sheet printed on a front side thereof in a circulating manner along the circulating transfer route, reversing front to rear, to make a print on a rear side thereof in an interleaf control method, the duplex printing apparatus comprising: a printer adapted for image formation onto a sheet of a sheet width Lp in a transfer direction, with a sheet spacing Lg and a printing transfer speed Vg;a constant speed transferrer adapted for constant speed transfer of sheet at the printing transfer speed Vg from a register for sheet registration via the printer to a prescribed speed change position in the circulating transfer route;a variable speed transferrer adapted for transfer of sheet from the speed change position via the sheet reversing path to the register, anda transfer controller configured to control transfer speeds of sheet in the variable speed transferrer,the variable speed transferrer comprising sections configured for sheet transfer, including a combination of a deceleration section and an acceleration section adapted for sheet reversal at the sheet reversing path, and a constant speed section adapted for transfer at a transfer speed Vr,the transfer controller being adapted to, in the case of two or more sheets: determine a circulating sheet number N employing a combination of sheet width Lp, spacing between sheets Lg and a total circulating transfer distance,execute a calculation of transfer speed Vr employing a combination of the circulating sheet number N, sheet width Lp, sheet spacing Lg, printing transfer speed Vg, and accelerations to be applied at the deceleration section and the acceleration section, to transfer a sheet from the register in the circulating manner to the register within a time interval of N×(Lp+Lg)/Vg, andcompare the calculated transfer speed Vr and the printing transfer speed Vg, and to set the transfer speed Vr to be the printing transfer speed Vg or more by reducing the circulation sheet number N and recalculating the transfer speed Vr, if the transfer speed Vr is less than the printing transfer speed. 2. The duplex printing apparatus according to claim 1, wherein the variable speed transferrer further includes, as a section configured for sheet transfer, a second deceleration section adapted for a pause of a sheet at the register, andthe transfer controller is adapted to execute a calculation of transfer speed Vr further employing an acceleration to be applied at the second deceleration section. 3. The duplex printing apparatus according to claim 2, wherein the variable speed transferrer is adapted to provide a sheet at a pause at the register with an amount of slack Lt for correction of oblique position of the sheet, andthe transfer controller is adapted to execute a calculation of transfer speed Vr further employing the amount of slack Lt. 4. The duplex printing apparatus according to claim 1, wherein the variable speed transferrer is adapted to have a time interval for sheet transfer including a pause time Wt for sheet reversal at the sheet reversing path, and the transfer controller is adapted to execute a calculation of transfer speed Vr further employing the pause time Wt. 5. The duplex printing apparatus according to claim 4, wherein the variable speed transferrer comprises a reverse drive roller configured to reverse a sheet at the sheet reversing path, andthe transfer controller is adapted to execute a calculation of transfer speed Vr further employing a trailing end margin Ls between a position of the reverse drive roller and a position of an end of the sheet at an end of the reverse drive roller in the pause time for sheet reversal. 6. The duplex printing apparatus according to claim 1, wherein the transfer controller is further adapted to compare the calculated transfer speed Vr to a permissible maximum speed Vrmax of the variable speed transferrer, and to set the transfer speed Vr to be the permissible maximum speed Vrmax of the variable speed transferrer or less by increasing the sheet spacing Lg and recalculating the transfer speed Vr if the calculated transfer speed Vr is greater than the permissible maximum speed Vrmax. 7. The duplex printing apparatus according to claim 1, wherein the transfer controller is adapted to compare a plurality of combinations of circulating sheet number N and transfer speed Vr, with each combination affording the transfer speed Vr to be set to the printing transfer speed Vg or more, anddetermine a combination of circulating sheet number N and transfer speed Vr in accordance with a user's selection. 8. The duplex printing apparatus according to claim 1, wherein the constant speed transferrer comprises one or more drive rollers configured for sheet transfer, including at least one drive roller nearest to the speed change position and configured with a one-way clutch structure with respect to a sheet transfer direction. 9. The duplex printing apparatus according to claim 1, wherein the circulating transfer route has the printer positioned thereto at a longer distance from the speed change position than a transfer-directional width of a sheet of a predetermined maximal certified size.
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