JP2004209837A5 - - Google Patents

Description

When the front end of the printing plate is aligned with the front end of the printed corrugated cardboard sheet, printing is performed at an intended position on the corrugated cardboard sheet, and the following description will be given. Further, the counting reference point at the front end position of the corrugated cardboard sheet may be set at an arbitrary position in the vicinity of the feed roll. However, in order to simplify the explanation, the counting reference point is made coincident with the feed roll position in the following description.
In FIG. 3, if the distance between the feed roll 41 and the first printing cylinder 51 and the distance between the feed roll 41 and the second printing cylinder 61 are L1 and L2, respectively, the leading end of the corrugated cardboard sheet 11 of the printing material is the feed roll position A0. At the point of time, the rotational phase of the first printing cylinder 51 is adjusted so that the leading edge position B1 of the printing plate is positioned at a distance L1 from the bottom dead center A1 of the printing cylinder 51 along the printing plate circumference on the cylinder 51 ( Register). Similarly, the rotational phase of the second printing cylinder 61 is also adjusted so that the leading edge position B2 of the printing plate is positioned L2 closer to the printing plate on the cylinder 61 from the bottom dead center A2 of the printing cylinder 61.

Claims (4)

In a sheet-fed printing press for corrugated cardboard sheets, a drive motor provided for each feed roll and each printing cylinder, a rotary encoder directly connected to the drive motor shaft, and a counting reference point position set near the feed roll A storage device for storing the distance to each printing cylinder position and each printing plate length, the speed of the feed roll, the feeding interval length, and the relationship between the printing plate position on each printing cylinder and the printing plate length. A control device for controlling the speed and phase of each printing cylinder, and a section for intentionally driving the printing plate circumferential speed on each printing cylinder asynchronously with the circumferential speed of the feed roll, if necessary, A method for controlling a corrugated cardboard sheet-fed printing machine, characterized in that printing can be performed at an intended position even on a corrugated cardboard sheet fed with a dimensional period not equal to the printing plate circumference. In a corrugated cardboard sheet-fed printing press having a slotter for forming a slot in a corrugated cardboard sheet or an independently installed cardboard sheet box making machine slotter, a feed motor and a drive motor provided separately for each slotter, and the drive motor shaft Directly connected rotary encoder, storage device for storing the distance from the counting reference point position set in the vicinity of the feed roll to each slotter position, the speed of the feed roll, the feeding interval length, the cardboard sheet length, and the order processing A control device that controls the speed and phase of each slotter based on the relationship between the slot length at the front part of the sheet according to the specification, the slot length at the rear part of the sheet according to the order processing specification, and the slotter knife reference point position on each slotter. A section in which the peripheral speed is intentionally non-synchronized as necessary with the peripheral speed of the feed roll. Only in, characterized in that to allow slot processing into intended position against the cardboard sheet to be fed with unequal dimensions period for circumference dimension of the Surottanaifu, control method of slotter. Wherein when the distance from the counting reference point position set in the vicinity of the feed roll of claim 1 to respective print cylinder position is greater than the feeding interval length of the cardboard sheet, the count reference point position set in the vicinity of the feed roll At each starting point, a counter is provided for each of the printing cylinders to track the movement of the leading edge position of the corrugated board sheet from the respective printing cylinders to the position returned by the paper feed interval length to the front side thereof. A control method for a corrugated sheet-fed printing press, wherein the control reference points for the speed and phase of each printing cylinder are used. Wherein when the distance from the counting reference point position set in the vicinity of the feed roll of claim 2 to respective slotter position is greater than the cardboard sheet feeding interval length of the slots, counting the reference point position set in the vicinity of the feed roll Starting from the slotter position to the near side, for the front slot machining, to the position returned by the length obtained by subtracting the front slot machining length from the feed interval length, and for the rear slot machining, the feed interval. A counter is provided for each slotter to track the movement of the leading end position of the corrugated board sheet from the length to the position returned by a length obtained by subtracting the total length of the front slot processing length and the slot interval length, and the tracking completion point of each counter And a control reference point for the speed and phase of each slotter.