JPH0568637U - Paper retainer - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents slipping of the web even if the paper splice part of the web wound around the cooling roller, which has a higher peripheral speed than the printing speed, passes through the paper press roller and the paper press roller jumps up. To [Structure] Paper pressing rollers 7a and 7b are attached to the cooling rollers 6c and 6d, respectively, and the paper 2 is pressed against the cooling rollers 6c and 6d by the paper pressing rollers 7a and 7b during paper conveyance. When the paper splice portion passes through the paper pressing roller 7a, even if the roller 7a jumps up, the other paper pressing roller 7b presses the paper 2 against the cooling roller 6d and prevents slipping.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper pressing device that presses a paper wound around a rotating body such as a roller or a cylinder against the rotating body.

[0002]

[Prior Art]

 For example, in a rotary printing machine as shown in FIG. 5, the web (rolling paper) 2 printed by the printing unit 1 is dried with the ink by the dryer 3, then the web 2 is cooled by the cooling device 4, and the web is passed through the drag device 5. To the folding machine. In the cooling device 4, as shown in FIG. 6, the web 2 is wound around a plurality of cooling rollers 6 driven by a drive source of a rotary printing machine (not shown).

The speed of the web 2 in front of the cooling device 4, that is, the speed of the printing machine is set lower than the peripheral speed of the cooling roller 6 so that the web 2 is tensioned. Then, in order to prevent slipping of the web 2, the web 2 is pressed by the paper pressing roller 7 on one cooling roller 6.

By the way, since the web-fed rotary printing press uses web paper, when the web paper set in the paper feeding device becomes small, it is possible to continuously supply paper by splicing new web paper prepared. It has become. The splicing of the webs 2 is performed by adhering the web ends with an adhesive tape 8 as shown in FIG.

[0005]

[Problems to be solved by the device]

 Since the paper edges are overlapped and bonded with the adhesive tape 8, the thickness of the paper joint portion 9 is about three times the thickness of the paper 2. Therefore, when this portion passes between the cooling roller 6 and the paper pressing roller 7, the paper pressing roller 7 jumps up, slipping between the cooling roller 6 and the web 2 occurs, and the stable state of paper conveyance is lost.

Further, when the paper pressing roller 7 is in a floating state, the tension applied to the web 2 is changed, the folding position and the cutting position are displaced, it takes time to return to the proper tension, and the waste paper increases. Will end up. In some cases, the mark position for controlling the folding position may be out of control of the sensor, resulting in loss of control.

[0007]

[Means for Solving the Problems]

 In view of the above situation, the present invention has been made in order to prevent the stable state of paper conveyance from deteriorating even when the paper splice portion passes through the pressing roller. The present invention is characterized in that a plurality of paper pressing rollers for pressing paper against rotating bodies that rotate at different peripheral speeds are provided for one rotating body, or a plurality of paper pressing rollers are provided separately for at least two rotating bodies.

[0008]

[Action]

 According to the above-described paper pressing device, even if the paper pressing roller bounces up when the paper splice portion passes through one paper pressing roller, the other paper pressing rollers press the paper against the rotating body. The paper is always pressed against the rotator by a paper pressing roller, and the paper does not slip.

[0009]

【Example】

 FIG. 1 shows an outline of a cooling device 4 provided with a paper pressing device according to an embodiment, and FIGS. 2 and 3 show a concrete structure. Cooling rollers 6a, 6b, 6c and 6d are arranged from the inlet side to the outlet side of the cooling device 4 and are rotated at a peripheral speed higher than the speed of the printing unit. The web 2 is wound around the cooling rollers 6a to 6d. In this embodiment, paper pressing rollers 7a and 7b are provided on the third and fourth cooling rollers 6c and 6d from the entrance side, and the web 2 is cooled by the paper pressing rollers 7a and 7b at the respective positions. , 6d is pressed against the surface.

Specifically, as shown in FIGS. 2 and 3, the levers 12 are pivotally supported by the pin shafts 13 on the inner side surfaces of the left and right frames 11 of the cooling device 4, respectively, and one end portions of these levers 12 are supported. A paper pressing roller 7a or 7b parallel to the cooling roller 6c or 6d is supported therebetween. An air cylinder 14 attached to the frame 11 is connected to the other end of the lever 12. When the air cylinder 14 is extended, the lever 12 is rotated toward the cooling rollers 6c and 6d, and the paper pressing rollers 7a and 7b are pressed against the surfaces of the cooling rollers 6c and 6d. Therefore, the web 2 is pressed down. When the air cylinder 14 is shortened, the lever 12 rotates in the opposite direction and the paper pressing rollers 7a and 7b are separated from the surfaces of the cooling rollers 6c and 6d.

While the web 2 is being conveyed, the paper pressing rollers 7a and 7b are elastically pressed against the surface of the cooling rollers 6c and 6d by air pressure. In other words, the web 2 is pressed against the surfaces of the cooling rollers 6c and 6d by the paper pressing rollers 7a and 7b, and the slip is prevented.

When the paper splicing portion 9 (see FIG. 7, hereinafter the same) passes the paper pressing roller 7a, the paper pressing roller 7a jumps up, and the web 2 cannot be pressed for a moment. However, since the other paper pressing roller 7b having a different position presses the web 2, the slip of the web 2 is prevented. When the paper splicing portion 9 passes the paper pressing roller 7b, the paper pressing roller 7a has already returned, and even if the paper pressing roller 7b jumps up, the web 2 is pressed against the cooling roller 6c by the paper pressing roller 7a. Therefore, slip does not occur. In this way, either of the paper pressing rollers 7a and 7b always presses the web 2. When the web 2 is passed through the cooling device 4, the paper pressing rollers 7a and 7b are separated from the cooling rollers 6c and 6d.

FIG. 4 shows a schematic configuration of another embodiment. This is one in which two paper pressing rollers 7a and 7b are provided for one cooling roller 6d, and the operation thereof is the same as in the previous embodiment. That is, even when the paper splicing portion 9 is passed, either the paper pressing roller 7a or 7b always presses the web 2 against the cooling roller 6d.

In each of the above embodiments, two paper pressing rollers 7a and 7b are provided. However, the number of paper pressing rollers is not limited to two, and three or more may be used as one or a plurality. It may be provided for the cooling roller. Further, as a method of attaching / detaching the paper pressing rollers 7a, 7b to the cooling roller, it is also possible to use a linearly advancing / retreating type instead of swinging. Further, the presser device is not limited to the one attached to the cooling device, and may be configured for a roller or a cylinder between the printing unit and the folding machine. However, the peripheral speed of a rotating body such as a roller or a cylinder is meaningless unless it has a peripheral speed different from the printing unit speed.

[0015]

[Effect of the device]

 According to the paper pressing device of the present invention, when the paper splicing part passes, one of the paper pressing rollers always presses the web against the rotating body such as the roller or the cylinder, so that the web does not slip and is always stable. It can be transported in the closed state. Therefore, it is possible to prevent a folding position, a cutting position shift, and the like, which have conventionally been caused by the slip.

[Brief description of drawings]

FIG. 1 is a schematic view of a paper pressing device according to an embodiment.

FIG. 2 is a side view of a specific structure according to an embodiment.

FIG. 3 is a developed view of a part of FIG.

FIG. 4 is a schematic view of another embodiment.

FIG. 5 is a schematic diagram of a printing apparatus.

FIG. 6 is a schematic view of a conventional paper pressing device.

FIG. 7 is an explanatory diagram of a state where the paper pressing roller is jumped up.

[Explanation of symbols]

 1 Printing Unit 2 Web (paper roll) 3 Dryer 4 Cooling Device 6, 6a, 6b, 6c, 6d Cooling Roller 7, 7a, 7b Paper Pressing Roller 9 Paper Joint 12 Lever 14 Air Cylinder

Claims (2)

[Scope of utility model registration request] 1. A paper pressing device comprising a plurality of paper pressing rollers for pressing a paper against a rotating body rotating at a peripheral speed different from the speed of a printing unit, for one rotating body. 2. A paper pressing device comprising a plurality of paper pressing rollers for pressing a paper against a rotating body rotating at a peripheral speed different from the speed of the printing unit, the plurality of paper pressing rollers being divided into at least two rotating bodies.