JPH0373757A - Paper folding device - Google Patents

Abstract

PURPOSE:To reduce the bending deflection and bending curvature and improve the paper folding quality by installing a stacker edge for forming a folding line which is set toward the press contact part of a paper folding roller in a nearly equal distance from a pair of nip rollers and a roller shaft onto which a pair of paper folding rollers can be press-attached. CONSTITUTION:Simultaneously with the stop of a paper 31 at a stopper 30, a swing arm 46 lowers, and the undersurfaces of a pair of nip rollers 43 arranged at the both edges of the swing arm 46 nipping-hold the front paper 31 so as to lightly press the surfaces of the first paper folding rollers 11 and 12 from above. At the same time, a bending start line is uniformly formed on the paper 31 by the stacker edges 42A and 42B positioned at the both edge parts of the swing arm 46, and the paper 31 is inserted to a prescribed depth. Then, the paper 31 is bitten along the bending start line through the nipping and rotation of the paper folding rollers 11 and 12 which rotate in the opposite directions as shown by the arrows and the nip roller 43, and then discharged, passing through the first paper folding rollers 11 and 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement for improving the folding accuracy of a paper folding device.

[Conventional technology]

The conventional technique will be explained with reference to a side view of a paper folding device shown in FIG. 4 and state diagrams showing the paper folding process in FIGS. 5(a), (b), and (c). The paper 31 loaded on tray l is '
Two paper feed rollers 2 and 3, each rotating at a constant speed in the same direction
is sent out in the direction indicated by the arrow towards guide rollers 20.21.

The paper 31 that has passed through the guide rollers 20.21 is transferred to the guide rollers 20.21. First paper folding roller IL second paper folding roller 13, guide roller 17 and intermediate roller 18.1
9 and is fed by an endless conveyor belt 10 running in the direction of the arrow, passing over the first paper folding rollers 11, 12 in front and being conveyed to the first stopper guide 22. Then, the first tacker 23, which rotates upward and downward at a constant stroke about the hinge 23a, gives the sheet 31 equal folding trigger lines necessary for folding it in half.

The tip of this bend enters so as to be wedged between the first paper folding rollers 11.12 rotating at a constant speed in opposite directions, and
The sheet 31 is folded by being pinched, rotated, and conveyed by the conveyor belt 10 wound around the conveyor belt 10, and a first folded sheet 32 shown in FIG. 5(a) is produced. The paper 32 is then wound around the second paper folding roller 13 and sent to the second stopper guide 24 by the conveyor belt 10 which runs in the direction shown by the arrow. 25 and the second paper folding roller 13.
14 and the conveyor belt IO, rotation, and conveyance, a second folded sheet 33 folded into four as shown in FIG. 5(b) is produced. The sheet 33 that has passed the second folding rollers 13 , 14 is then conveyed by the conveyor belt 10 over the guide roller 17 and into the third stopper guide 26 . The eight-fold paper shown in FIG. 5(c) is sent out by the sandwiching and rotation of the third paper folding roller 15, 16 and the third paper folding roller 15, 16, which operates in the same manner as the first paper folding roller 23 and the second paper folding roller 25 described above. A folded sheet 34 is produced to complete the predetermined paper folding process. The paper 31 is continuously processed by the paper folding device configured as described above.

[Problem to be solved by the invention]

The paper feeding speed of the paper folding device is 6 to 7 sheets of paper 31. per second. And since it has the ability to transport and process the processed sheets 32, 33, 34, the speed at which each sheet is fed is extremely high. Therefore, for example, when the paper 31 reaches the stopper guide 22, although there are guides above and below the paper 31, there is a gap necessary for carrying the paper 31, so the paper 31 is not directly received, but the paper 31 immediately after being carried. is unstable because it floats or curves. If the first tacker 23 operates in this unstable state, the edge will not evenly hit the surface of the paper 31, but will hit unevenly.
; and since there is no upper support, the paper 31 may slip irregularly and have a bent fold line, or may be wedged into the first paper folding roller 11 without having evenly divided fold lines. 12 and the conveyor belt 10
This results in a paper fold that is deformed by Therefore, Fig. 5 (a
), the bending a and the folding deviation b in the figure each amount to about 8 mm. This is explained in the second section above. The same phenomenon occurs in the third paper folding mechanism, so that the paper 34 that is finally folded into eight is extremely deformed and difficult to see. In addition, the folded paper 34 deformed in this manner will not be fully loaded into the container scheduled for the next process, causing jamming and often causing the loading device to stop, resulting in a significant drop in operating efficiency. The present invention solves these problems and even in the paper folding process where the paper is conveyed and processed at high speed, the paper 31 and the paper 32, 33, and 3 that are in the middle of being processed are
To provide a filter paper folding device capable of folding 4 pieces into equal parts without bending.

[Means to solve the problem]

This objective is achieved by any of the following means.

(a) A pair of paper folding rerollers are provided, a pair of nip rollers are disposed parallel to and substantially symmetrically with respect to the pressure contact portion of the rollers, and are capable of pressure contact with each of the rollers; 1. A paper folding device comprising a tacker table having a tacker edge for forming a fold line facing a pressure contact portion of a roller.

(b) The paper folding device according to item (a), wherein the tacker edge has bearings for the pair of nip rollers forming a bracket, and at least one bracket to which the nip rollers are attached is attached to the tacker stand. .

(c) The paper folding device according to item (b), wherein at least one of the brackets has elasticity in a direction substantially toward the pressure contact portion of the paper folding roller with respect to the tacker table.

〔Example〕

Embodiments of the present invention are shown in FIGS. 1 and 2. A perspective view of a paper folding mechanism in which a nip roller is attached to a tuff force, and a paper folding mechanism in which an elastic member is disposed between a tacker and a swing arm or a tacker stand. This will be explained with reference to a side view. However, the present invention is not limited to this example. Also, items that have the same functions as conventional items are represented by the same symbol. An embodiment of the present invention will be described mainly with reference to the perspective view of FIG. The paper 31 sent out from the tray L in the direction indicated by the arrow is
It passes over the surface of the paper folding rollers 11, 12 and is positioned against a front paper stopper 30 disposed at a fixed position on the main body of the paper folding device. A tacker 42 including tacker edges 42A and 42B is attached to the lower surface of both left and right ends of the swing arm 46, and the tacker edges 42A and 42
A pair of nip rollers 43 are rotatably mounted between the rollers B, and the bearings form a bracket. The swing arm 46 is configured to rotate at a constant stroke in the upward and downward directions indicated by arrows around a hinge (not shown), and until the paper 31 is conveyed and positioned at the paper stopper 30, positioned. At the same time as the paper 31 stops at the stopper 30, the swing arm 46 descends, and the lower surface of each pair of nip rollers 43 disposed at both ends of the swing arm 46 folds the front paper 31 from above into the first paper fold. It is held so that it is lightly pressed against the surface of the rollers 11 and 12. At the same time, the folding edges 42A and 42B located at both ends of the swing arm 46 uniformly create folding lines on the sheet 31, and the sheet 31 is inserted to a predetermined depth. Next, the paper 31 is nipped and rotated by the paper folding roller 11.12 and the nip roller 43, which rotate in opposite directions as shown by arrows, so that the paper 31 is nipped along the folding trigger line and passes through the first paper folding roller 11.12. It passes through and becomes the first folded sheet 32 of the first step and is carried out. The first folded paper 32 is conveyed to the second paper folding mechanism section for the next step by the conveyance belt IO wound around the first paper folding roller 11. After making a bend line on the paper 31 with the tacker edges 42A and 42B, the swing arm 46
rotates upward, moves away from the paper 31 together with the nip roller 43, and returns to the normal position. The respective structures and functions of the second paper folding mechanism, the third paper folding mechanism, and the conveyor belt are as described in the first paper folding 11! Since it has the same function as the structural part and is placed in the same fixed position as before, in the second paper folding process, the fifth
The second folding paper 32 shown in FIG. 5(b) is processed, and in the subsequent third paper folding process, the third folding paper 34 shown in FIG. 5(c) is processed to complete the predetermined paper folding process.

Another embodiment of the above-described embodiment of the present invention is shown in FIG. A bearing bracket formed by holding a pair of nip rollers 43 on the tacker 42 is attached to both ends of the tacker stand 41, and turns on and off the electromagnet of a solenoid 45 disposed on the tucker stand 41 to move the tacker stand 41 in the direction of the arrow. As shown in
The first folding paper 32 is made by making a constant downward reciprocating motion, and then applying a predetermined folding trigger line to the paper 31 using the same structure and function as the above-described rotation method of the swing arm 46 during the downward stroke. Made. Subsequently, the second folded paper 33 and the folded paper 34 are produced by the paper folding apparatus to which this embodiment is applied.

In still another embodiment, a bearing including a pair of nip rollers 43 on the tacker 42 has a bracket attached to the swing arm 46 or the center of the lower surface of the tacker stand 41. The sheet 31 and the folded sheets 32, 33, and 34 can also be processed using a paper folding device to which the paper folding mechanism shown in FIG. 1 or 2 is applied. Further, as shown in FIG. 3, the bearing in which the tacker 42 is provided with l pairs of nip rollers 43 has a rubber band between the mounting surface of the bracket and the swing arm 46 or the tacker stand 41.
; is provided with an elastic member 47 made of plastic material or the like. In this way, the role of a buffer damper can be provided between the nip roller 43 and the paper folding crawlers 11, 12, 13, 14, 15, 16, and the paper 31
It is also possible to prevent the tacker edges 42A, 42B from hitting unevenly the paper 32, 33 folded in each step. This configuration is also naturally included in one embodiment of the present invention.

〔Effect of the invention〕

Since the present invention is constructed as described above, even a paper folding device that is conveyed and processed at high speed has a simple structure that can be easily used compared to the conventional 811.
This method not only improves the paper folding quality but also improves the paper folding quality by reducing extremely large fold misalignments and folds of 0.5 mm or more and making them almost negligible. It can also be loaded into containers with no problems. Therefore, there is almost no need to stop or inspect the loading device due to jamming during loading, which has often occurred in the past, and there is a great economic effect of greatly improving the operating rate of the device.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a paper folding mechanism in which a pair of nip rollers are held by a tacker and a bearing bracket is disposed on a swing arm according to an embodiment of the present invention. FIG. 2 is a perspective view of a paper folding mechanism in which a pair of nip rollers are held by a tacker and a bearing bracket is disposed on a tacker stand according to an embodiment of the present invention. FIG. 3 is a side view of the paper folding mechanism in which the bearing has an elastic member disposed between the bracket and the swing arm or the tacker stand. FIG. 4 is a side view showing a conventional paper folding device. FIGS. 5(a), 5(b), and 5(C) are state diagrams showing paper folding in the paper folding process. l...Tray 2.3...Paper feed roller 11.12...First paper folding roller 13.14...Second paper folding roller 15.16...Third paper folding roller 17. ...Second guide roller 18.19...Intermediate roller 20.21...First guide roller 22...First stopper guide 23...First tack 24...Second stopper guide 25...First 2 Tafuka 26...Third stopper guide 27...Third tack 30...Paper stopper 31...Paper 32...First folding paper 33...Second folding paper 34...Third fold Paper 41... Tacker stand 42... Tacker 42A,
42B...Takkaetsuji

Claims (3)

[Claims] (1) A pair of paper folding rollers are provided, a pair of nip rollers are disposed parallel to and symmetrically with respect to the pressure contact portion of the rollers, and are capable of pressure contact with each of the rollers, and the paper folding roller is provided at approximately the same distance from the roller axis. A paper folding device comprising a tacker stand having a tacker edge for forming folding lines facing the pressure contact portion of the roller. (2) The paper folding device according to claim 1, wherein the tacker edge forms a bearing bracket for the pair of nip rollers, and at least one bracket to which the nip rollers are attached is attached to the tacker stand. (3) The paper folding device according to claim 2, wherein at least one of the brackets has elasticity in a direction substantially toward the pressure contact portion of the paper folding roller with respect to the tacker stand.