JP2004237711A5 - - Google Patents

Description

  FIG. 3 is an explanatory view of the slotter control for the corrugated board box making machine. In FIG. 3A, reference numerals 41 and 42 denote feed rolls in the sheet feeding unit, 81 is an upper slotter, 82 is a lower slotter, 811k is a first slotter knife, 811ka is a control reference point for the first slotter knife, and 812k is a second slotter. The knife, 812ka is the control reference point of the second slotter knife, and the dimension Rk is the turning radius in the control calculation of the slotter knife. The dimension L1 is the distance from the feed roll to the slotter, and L1x is the amount of movement to the slotter bottom dead center along the rotation circumference of the first slotter knife reference point.

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, in the following description, this counting reference point is made coincident with the feed roll position.
FIG. 3A shows the positional relationship to be set for each part at the moment when the leading end of the slotted corrugated sheet reaches the feed roll position. The first slotter knife is the end point of the sheet front slot according to the order processing specification. In addition, the second slotter knife mechanically initializes the phases of the respective slotter knife reference points 811ka and 812ka at the start point of the sheet rear slot according to the ordering specification. Between each dimension value in FIG. 3 (a), (b), there exists a relationship of the following formula 1 and formula 2.
L1x + 2π · Rk · n = L1 Formula 1
Ls3 = Ls0− (Ls1 + Ls2) Equation 2
Where Rk: radius of rotation of slotter knife
n: 0 or a positive integer The above phase is maintained during operation, and the slotter is driven by synchronizing the slotter knife rotational peripheral speed with the feed roll peripheral speed. In the conventional apparatus, the sheet feed interval length of the slotted corrugated cardboard is a circumferential length Lsk (= 2π · Rk, hereinafter referred to as a slotter knife) having a radius Rk from the slotter rotation center point to the corrugated sheet thickness center on the paper line. It is an absolute prerequisite to match the rotation circumference.

Claims (2)

In a corrugated cardboard box making machine having a slotter for forming a slot in a corrugated cardboard sheet, the upper slotter is provided with a first slotter knife for processing the front slot of the sheet and a second slotter knife for processing the rear slot of the sheet, a feed roll, A drive motor individually provided for the upper slotter and the lower slotter, a rotary encoder directly connected to the drive motor shaft, and a memory for storing the distance from the counting reference point position installed near the feed roll to the slotter position From the relationship between the apparatus, the speed of the feed roll, the feeding interval length, the corrugated sheet length, the sheet front slot length according to the ordering specification, the sheet rear slot length according to the ordering specification, and the reference point position of each slotter knife Equipped with a controller that controls the speed and phase of the slotter and lower slotter Corrugated cardboard fed with a dimensional cycle not equal to the rotation peripheral length of the slotter knife by providing a section in which the rotation peripheral speed of each slotter knife is intentionally non-synchronized with the peripheral speed of the feed roll as necessary. A slotter control method characterized by enabling slot processing to an intended position with respect to a sheet or slot processing at a slot interval not equal to a distance between two slotter knife reference points. Wherein when the distance from the counting reference point position placed near the feed roll of claim 1 to said slotter position is greater than the cardboard sheet feeding interval length of the slots, counting the reference point position placed near the feed roll At the starting point, a counter is provided to track the movement of the cardboard sheet tip position from the slotter position to the front side of the sheet feeding interval to the position returned by the length obtained by subtracting the front slot machining dimension on the cardboard sheet tip side. A method for controlling a slotter, wherein the tracking completion point of the counter is used as a control reference point for the speed and phase of the upper slotter.