JPS6243784Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sheet transport device in a box making machine, and more specifically, to a sheet transport device in a box making machine that is equipped with a plurality of printing units spaced apart to print multicolors on the sheet surface. be.

The sheets are fed out one by one from the supply section using a kicker, and the fed sheets are sequentially guided to multiple printing sections, where each printing section prints in a different color (multicolor printing), and then performs ruled line processing and slot processing. In recent box-making machines, the rotation error of each rotation of the feed roller, printing drum, ruling roller, slot roller, etc. is small, and therefore it is possible to avoid problems such as printing misalignment or poor slot processing. Although it has a structure that allows accurate processing with almost no defects, even in such a high-precision box making machine, printing misalignment often occurs due to sheet warping or slips in the intermediate transfer section of each rotating section. occurs, resulting in product loss.

The present invention provides a sheet transport device that can prevent printing errors caused by slips or sheet warping during transport in the above-mentioned box making machine.

The drawings showing embodiments of the present invention will be described below. Figure 1 schematically shows the outline of a box-making machine using cardboard sheets as raw materials, where A is a sheet material supply section equipped with a reciprocating puncher 1, and B is
-1, B-2... B-N is a printing section equipped with printing drums 2, 2 of the same diameter, and C is a processing section equipped with a ruling roller 3 and a slotter roller 4, and a supply section A The sheet 5 ejected from the supply section A by the reciprocating motion of the kicker 1 in
is held between a pair of feed rollers 6, 6 and transferred to the first printing section B-1, where the printing drum 2 prints the first color, and then the second printing section B-1.
2, where the second color printing is performed, and then similarly transferred to the third printing section B-3 and the fourth printing section B-3.
4,...The sheet is sequentially transported toward the Nth printing section B-N, and predetermined multicolor printing is performed on the surface of the sheet, then ruled lines are processed by a pair of ruled line rollers 3, 3, and finally a pair of Slotter rollers 4, 4 form slots in the flaps of the top and bottom lids for ejection.

The present invention provides a plurality of printing parts B- for such multicolor printing.
1, B-2...B-N, a reciprocating kicker 1 in the supply section A, printing drums 2, 2 in each of the printing sections, and a ruled line roller 3 and a slotter in the processing section C. While driving the rollers 4 synchronously, each of the above parts A, B-1, B-
2...A timing belt type upper conveyor belt 8 having tooth profiles 7 on its inner surface as shown in FIG. 4 above and below the sheet transport path between B-N and C.
A lower conveyor belt 9 is stretched to transport the sheet 5 while holding it in the sheet transport path between each section, and furthermore, at least each printing section B--
1, B-2...B-N The total length of the upper conveyor belt 8 stretched in the transport direction of the sheets 5 is an integral multiple (preferably 1 to 3 times) of the circumferential length of the printing drum 2. At the same time, the upper and lower conveyor belts 8, 9 are actively rotated by toothed wheels 10, 10 at a speed equal to the circumferential speed of the printing drums 2, 2. , 6 are sequentially fed out at equal intervals, and are transferred to each section B-1, B-2, .

Note that the above-mentioned pair of upper and lower belt conveyors 8, 9
As shown in FIG. 3, several sets of sheets may be installed at intervals in the width direction of the box-making machine, or as shown in FIG. Two sets may be installed. In the latter case where two sets of belt conveyors 8 and 9 are used,
It is desirable that the spacing between the tension members is adjustable in accordance with the width dimension of the sheet 5. Also, the distance between the upper and lower belt conveyors 8 and 9, the distance between the pair of feed rollers 6 and 6, and the distance between each printing drum 2 and each bottom drum 11 depends on the thickness of the sheet 5 to be processed. Of course, the structure is such that it can be adjusted as appropriate.

As described above, the sheet transporting device in the box making machine according to the present invention includes a sheet feeding section A equipped with a reciprocating puncher 1, and a plurality of printing sections B-1 and B-, each equipped with a printing drum 2 having the same outer diameter. 2... In a box making machine equipped with B-N and a processing section C in which a ruled line roller 3 and a slotter roller 4 are connected, the above-mentioned puncher 1, each printing drum 2, and ruled line roller 3 are provided.
and the slotter roller 4 are driven synchronously, and the supply section A, each printing section B-1, B-2...
...An upper conveyor belt 8 and a lower conveyor belt 9 of timing belt type are installed vertically over the entire length of each sheet transport path between B-N and processing section C, and furthermore, at least each printing section B-1, B −
2... The total length of the upper conveyor belt 8 stretched in the sheet transport direction side of B-N is an integral multiple of the circumferential length of the printing drum 2, and the upper and lower conveyor belts 8 and 9 are connected to the printing drum 2. The sheet 5 is actively rotated at a speed equal to the circumferential speed of the sheet 5, and the sheet 5 is conveyed while being held between the top and bottom.
By the reciprocating motion of the printer 1, the sheets 5 are sequentially sent out from the supply section A at equal intervals, and are accurately placed in each printing section B-1, B-2...
The sheet 5 is transferred to B-N and the processing section C, and the sheet 5 is sequentially printed in multiple colors at preset positions in each printing section before reaching the processing section C.

Furthermore, an upper conveyor belt 8 and a lower conveyor belt 9 of a timing belt type are respectively stretched in the transfer passage between each part A, B-1, B-2...B-N and C, and the sheet 5 is Since the sheet 5 is transported, even if the sheet 5 is warped, it is flattened by the upper and lower conveyor belts 8 and 9, and printing errors caused by the warp of the sheet 5 are eliminated.
Furthermore, since the upper and lower conveyor belts 8 and 9 are actively driven at the same speed as the circumferential speed of the printing drum 2, no slippage of the sheet 5 occurs between the upper and lower conveyor belts 8 and 9. There is no printing misalignment caused by slips during transportation as in the past. Furthermore, each printing section B-1, B-2...B-
Since the upper conveyor belt 8 stretched on the conveying side of the N sheets has a total length that is an integral multiple of the circumferential length of the printing drum 2 of each printing section, the ink printed on the sheet 5 is Even if one part of the surface of the upper conveyor belt 8 is transferred to the upper conveyor belt 8 and one part of the surface of the upper conveyor belt 8 becomes dirty, that dirty part will always come into contact with the printed area of the next sheet 5, and the upper conveyor belt This eliminates the inconvenience of stains 8 staining other parts of the sheet 5, thereby making it possible to prevent the occurrence of defective products and achieve highly accurate printing and processing.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and
Figure 1 is a simplified side view of the box making machine, Figures 2 and 3
The figure shows a partially enlarged side view and a plan view of the transfer section, and the fourth
The figure shows an enlarged view of the upper and lower conveyor belts, and
The figure is a plan view showing transportation by two sets of upper and lower conveyor belts. 1 is a kicker, 2 is a printing drum, 3 is a ruling roller, 4 is a slotter roller, 5 is a sheet, 6
is a feed roller, 7 is a tooth profile, 8 is an upper conveyor belt, 9 is a lower conveyor belt, 10 is a tooth profile wheel, A is a supply section, B-1, B-2...B-
N is the printing department and C is the processing department.

Claims (1)

[Scope of utility model registration request] A sheet supply section A equipped with a reciprocating kicker 1, a plurality of printing sections B-1, B-2...B-N, each equipped with a printing drum 2 having the same outer diameter, a ruling roller 3, a slotter roller 4, In a box making machine equipped with a processing section C in which
Each printing drum 2, ruled line roller 3, and slotter roller 4 are driven synchronously, and the entire length of each sheet transport path between the above-mentioned supply section A, each printing section B-1, B-2...B-N, and processing section C. An upper conveyor belt 8 and a lower conveyor belt 9 of a timing belt type are stretched vertically across the area, and furthermore, an upper conveyor belt 8 and a lower conveyor belt 9 of timing belt type are stretched at least on the sheet transport direction side of each printing section B-1, B-2...B-N. The total length of the upper conveyor belt 8 is an integral multiple of the circumferential length of the printing drum 2, and the upper and lower conveyor belts 8, 9
A sheet transfer device for a box making machine, characterized in that the sheet 5 is actively rotated at a speed equal to the circumferential speed of the printing drum 2, and the sheet 5 is transferred while being held between the upper and lower sides.