JPH09249352A - Orthogonal folding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a chopper arm of an orthogonal folding device lighter than that of an aluminum alloyed one in weight and higher rigidity by constituting it with a carbon fiber reinforced plastic, in a folding machine in a rotary press. SOLUTION: A chopper arm 21 consists of a carbon fiber reinforced plastic as its material, whereas that of the device heretofore in use is composed of an aluminum alloy as the material. Consequently, an extent of flexure is made to be very little even in a folding point or position where the chopper arm 21 goes down maximally, and further the extent of variable torque due to load of the chopper arm 21 itself is also made to be lessened, making it so as not to impose any unnecessary load on the folding machine. Moreover, since rigidity is high as far as approximately thirty times over as compared with that made of aluminum alloy, the extent of flexure of the chopper arm in time of folding work can be minimized, through which any paper break and cut in time of the folding work will in no case occur at all, and thus such one that gives no adverse effect to the accuracy of folding finish is securable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding machine for a rotary press having a chopper arm in a right-angle folding device.

[0002]

2. Description of the Related Art A conventional device will be described with reference to FIGS. FIG. 5 shows the entire appearance of the folding machine. The web folded in two in the running direction by the triangular plate 1 includes a lead-in roller 3, a first nipping roller 4, a horizontal sewing roller 5, and a second sewing roller.
After passing through the nipping roller 6, it enters between the folding cylinder 7 and the gripping cylinder 8 and is cut at the same time, and is folded in half in parallel with the cutting surface (parallel folding), and is orthogonal to the cutting surface by the right-angle folding device 9. It is folded in half in the direction (right angle folding) and sent to the impeller 10.

As shown in detail in FIG. 3, while traveling on the upper surface of the table 11, the parallel signatures discharged from the gripper cylinder 8 being sandwiched between the pair of lower conveyor belts 12 are conveyed, and stoppers are conveyed. At the same time as hitting (not shown), the folding blade 13 attached to the tip of the chopper arm 21 that reciprocates in the vertical direction is pushed into the pair of folding rollers 14 from the folding opening 11a.

The folding roller 14 sandwiches a folding plate and folds it in half (right-angle folding), and the folding plate folded in half at this half is sent to the impeller 10 shown in FIG. 5 by a conveyor belt (not shown).

Shaft 1 eccentrically provided on drive gear 15
6, a link 17 rotatably attached to the shaft 16,
The link 18 that can rotate with the link 17 and the chopper arm shaft 19 that is fixedly mounted on the frame 18 and is rotatably supported by the frame constitute a four-joint link with these four members, and correspond to a short link When the eccentric shaft 16 is rotated, the link 18, which corresponds to a long link, makes a reciprocating swing motion.

Due to this movement, the chopper arm shaft 19 reciprocally rotates, and the chopper arm 21 fixed to the chopper arm shaft 19 reciprocates upward and downward. Usually, the chopper arm 21 is an aluminum alloy (hereinafter referred to as aluminum alloy) casting, the folding blade 13 is a steel plate, the holding plate 20 for fixing the folding blade 13 to the chopper arm 21 is an aluminum alloy plate, and the swinging chopper arm 21 and the like. We are trying to reduce the weight of the parts.

[0007]

As described above, the conventional chopper arm 21 is made of an aluminum alloy casting to reduce the weight. However, such a weight reduction is not sufficient and the rigidity is good, and therefore, the most lowered position. Then, due to the inertial force due to its own weight, the chopper arm 21 itself bends as shown by the broken line 21 'as shown in FIG. 4, which adversely affects the folding accuracy, and the tip of the folding blade 13 comes into contact with the folding roller 14 as shown by the broken line 13'. However, this may cause the paper to tear and get scratched.

Further, since the chopper arm 21 swings back and forth, the fluctuation torque due to its own weight becomes large and the load applied to the folding machine becomes large.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems in the conventional one and to provide a chopper arm which is lighter and more rigid than an aluminum alloy chopper arm.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a right-angle folding device in which a chopper arm of the right-angle folding device is made of carbon fiber reinforced plastic in a folding machine of a rotary press. It is a thing.

That is, since the carbon fiber reinforced plastic has a rigidity as high as 3.0 times and a specific gravity as low as about 2/3 as compared with the aluminum alloy, by constructing the chopper arm with this carbon fiber reinforced plastic, The rigidity of the chopper arm can be increased and the weight can be reduced.

Further, because of the high rigidity, the amount of bending at the folding point where the chopper arm comes to the lowest position can be made extremely small.

Further, since the specific gravity is low, the fluctuating torque due to the weight of the chopper arm becomes small and the load applied to the folding machine becomes light.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. The same parts as those of the conventional one described above are designated by the same reference numerals in the drawings, and duplicated description will be omitted.

FIG. 1 shows a side surface of the right-angle folding device according to the present embodiment, and as is clear from comparison with the conventional device shown in FIG. 3, there is no significant difference in the overall structure between the two. .

That is, even if attention is paid to the chopper arm 21, the mode of the reciprocating swing motion when the chopper arm 21 makes a right-angled fold and the driving means therefor are all the same, and cannot be shown in the drawings. By the way, in the conventional apparatus, the material of the chopper arm 21 is an aluminum alloy, whereas in the present embodiment, the material is carbon fiber reinforced plastic.

Therefore, the chopper arm 2 of the present embodiment.
No. 1 makes the most of the material properties of carbon fiber reinforced plastic, in other words, selects this carbon fiber reinforced plastic as a material that is perfectly suited to the structural and functional positioning of the chopper arm 21 in the right-angle folding device. With this configuration, the rigidity and the weight can be reduced.

Due to this, the chopper arm 2
The bending amount at the folding point, which is the maximum descending position of 1, is extremely small, and the fluctuating torque due to the load of the chopper arm 21 itself is also small so that an unnecessary load is not applied to the folder. is there.

Although the present invention has been described with reference to the illustrated embodiments, the present invention is not limited to these embodiments.
It goes without saying that various modifications may be made to the specific structure within the scope of the present invention.

[0020]

As described above, according to the present invention, since the chopper arm of the right-angle folding device is made of carbon fiber reinforced plastic, the rigidity is about 3.0 times higher than that of the conventional aluminum alloy. The amount of bending of the chopper arm at the time of folding can be minimized, and the breakage or damage of the paper at the time of folding does not occur, and the folding accuracy is not adversely affected.

Further, since the specific gravity of carbon fiber reinforced plastic is as low as about 2/3 that of aluminum alloy, its rigidity is
Since the inertia can be made small and the fluctuating torque is suppressed and the load is lightened, the chopper arm in which the obstacle due to the inertia torque is reduced can be obtained.

[Brief description of drawings]

FIG. 1 is a side view of a chopper arm of a right angle folding device according to an embodiment of the present invention.

FIG. 2 is a plan view of the one in FIG.

FIG. 3 is a side view of a chopper arm of a conventional right-angle folding device.

FIG. 4 is an explanatory view for explaining a bent state of the chopper arm in FIG.

FIG. 5 is a perspective view showing an outline of a folding machine provided with a right-angle folding device.

[Explanation of symbols]

 13 Folding blade 16 Eccentric shaft 17, 18 Link 19 Chopper arm shaft 20 Holding plate 21 Chopper arm

Claims (1)

[Claims] 1. A folding machine for a rotary press, wherein the chopper arm of the right-angle folding machine is made of carbon fiber reinforced plastic.