JP2576112Y2 - Paper presser - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper holding device for pressing a paper wound around a rotating body such as a roller or a cylinder against the rotating body.

[0002]

2. Description of the Related Art In a rotary printing press as shown in FIG. 5, for example, a web (rolled paper) 2 printed by a printing unit 1 is dried by a dryer 3 and then cooled by a cooling device 4 to cool the web 2. It reaches the folding machine via the drag device 5. 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 driving source of a rotary printing press (not shown).

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

[0004] By the way, since the web is used in the rotary printing press, when the number of webs set in the paper feeding device becomes small, the prepared new web can be spliced and the paper can be continuously supplied. It has become. The joining of the webs 2 is performed by bonding the web ends together with an adhesive tape 8 as shown in FIG.

[0005]

Since the paper ends are overlapped and adhered with the adhesive tape 8, the thickness of the paper spliced 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, causing the cooling roller 6 and the web 2 to slip, and the stable state of paper conveyance is lost.

When the paper pressing roller 7 is in a floating state, the tension applied to the web 2 fluctuates, and the folding position,
A shift occurs in the cutting position, it takes time to return to the appropriate tension, and the number of waste sheets increases. In some cases, the mark position for controlling the folding position may deviate from the sensor and become uncontrollable.

[0007]

SUMMARY OF THE INVENTION In view of the above situation, the present invention has been made to prevent a stable state of paper conveyance from being lost even when a paper splicing section passes through a press roller. The configuration is characterized in that a plurality of paper pressing rollers for pressing paper against a rotating body rotating at a peripheral speed different from the speed of the printing unit are provided for one rotating body, or a plurality of paper holding rollers are divided into at least two rotating bodies. Is what you do.

[0008]

According to the paper holding device, even if the paper holding roller jumps up when the paper splicing section passes through one paper holding roller, the other paper holding roller presses the paper against the rotating body. Is always pressed against the rotating body by some paper pressing roller, and the paper does not slip.

[0009]

FIG. 1 schematically shows a cooling device 4 provided with a paper holding device according to one embodiment, and FIGS. 2 and 3 show a specific structure. 6a, 6b, 6c, 6d are cooling rollers arranged from the entrance side to the exit 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 the present embodiment, the third and fourth cooling rollers 6c and 6d from the entrance side are provided with paper pressing rollers 7a,
7b, the web 2 is cooled by a cooling roller 6 at each position by the paper pressing rollers 7a and 7b.
c, 6d.

More specifically, as shown in FIGS. 2 and 3, levers 12 are pivotally supported by pin shafts 13 on the inner surfaces of the left and right frames 11 of the cooling device 4, respectively. Further, a paper pressing roller 7a or 7b parallel to the cooling roller 6c or 6d is supported. An air cylinder 14 mounted on the frame 11 is connected to the other end of the lever 12. When the air cylinder 14 is extended, the lever 12 rotates toward the cooling rollers 6c and 6d, and the paper pressing rollers 7a and 7b
Is pressed against the surfaces of the cooling rollers 6c and 6d. Therefore, the web 2 is pressed. 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, 7
b is elastically pressed against the surfaces of the cooling rollers 6c and 6d by air pressure. That is, the web 2 is pressed against the surfaces of the cooling rollers 6c and 6d by the paper pressing rollers 7a and 7b, and slip is prevented.

When the paper splicing section 9 (see FIG. 7; the same applies hereinafter) passes through 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 at a different position presses the web 2, slippage of the web 2 is prevented. When the spliced portion 9 passes through 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. No slip occurs. Thus, any one of the paper pressing rollers 7a and 7b always
It is to hold down. 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 provided with two paper pressing rollers 7a and 7b for one cooling roller 6d, and the operation is the same as that of the previous embodiment. That is, even when passing through the paper splicing section 9, one of the paper pressing rollers 7a and 7b
Is pressed 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. May be provided for the cooling roller. Also, the method of attaching and detaching the paper pressing rollers 7a and 7b to and from the cooling roller may be a method in which the paper pressing rollers 7a and 7b move linearly instead of swinging. Further, the presser device is not limited to the one attached to the cooling device, but may be configured for a roller or a cylinder between the printing unit and the folder. However, the peripheral speed of a rotating body such as a roller or a cylinder has no significance unless it has a peripheral speed different from the printing unit speed.

[0015]

According to the paper holding device of the present invention, when the paper splicing section passes, one of the paper holding rollers always presses the web against a rotating body such as a roller or a cylinder, so that a slip occurs on the web. It can always be transported in a stable state. Therefore, the folding position, the cutting position shift, and the like, which have conventionally occurred due to the slip, are prevented.

[Brief description of the drawings]

FIG. 1 is a schematic view of a paper press device according to one embodiment.

FIG. 2 is a side view of a specific structure of one embodiment.

FIG. 3 is a development 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 press device.

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

[Description of Signs] 1 Printing unit 2 Web (winding paper) 3 Dryer 4 Cooling device 6, 6a, 6b, 6c, 6d Cooling roller 7, 7a, 7b Paper press roller 9 Paper joint 12 Lever 14 Air cylinder

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-29260 (JP, A) JP-A 63-84343 (JP, U) JP-A 63-11106 (JP, U) 18253 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) B41F 23/04 B41F 25/00 B41F 13/02 B65H 23/188

Claims (1)

(57) [Scope of request for utility model registration] 1. A paper pressing device, wherein a plurality of paper pressing rollers for pressing paper against a rotating body rotating at a peripheral speed different from the speed of a printing unit are provided for one rotating body.