JP2501342Y2 - Paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lead edge type sheet feeding device applicable to a corrugated board sheet box making machine, a printing machine, a sheet metal pressing machine and the like.

(Prior Art) FIG. 3 is a side sectional view of a conventional lead edge type sheet feeding device, and FIGS. 4 and 5 are defects of the lead edge type sheet feeding device and problems of the same type sheet feeding device. FIG. As shown in FIG. 3, a general corrugated board box making machine is composed of a paper feed section R, a printing section P, and a paper ejection section (not shown), a die cutter section, a folding section, a counter ejector section, and the like. . The paper feeding section R is an apparatus for sequentially carrying out the corrugated cardboard sheets 2 stacked on the table 1 one by one from the lowermost layer sheet 2a by a feeder, and the next process printing section P is a predetermined one for the fed corrugated cardboard sheets 2. This is the part to be printed. After that, through predetermined processing, the boxes are stacked as a folded box in the counter ejector, which is the final step, and are carried out as a predetermined number of bundles.

Next, an example of a lead edge type sheet feeding device will be briefly described. The back stop 10 of the sheet feeding section R moves forward and backward (arrow) on the sheet feeding table 1 as shown in FIG. 3 and can be fixed at any position corresponding to the length of the cardboard sheet 2 to be fed in the sheet feeding direction. The corrugated cardboard sheets 2 loaded in the previous step (not shown) come into contact with the front guide 11 and fall, and are sequentially stacked on the backstop 10. A plurality of delivery rolls 7 are provided below the lowermost sheet 2a so as to project slightly above the sheet feeding table 1.

Reference numeral 12 denotes a suction box, the inside of which is connected to a vacuum pump or a suction blower 14 via a duct 13.
Further, the suction box 12 is in a state in which the upper surface is shielded by the lowermost sheet 2a and is substantially sealed, and the suction blower is
A negative pressure region is formed inside by operating 14 and thereby functions to increase the frictional force F _O between the lowermost sheet 2a and the delivery roll 7. On the other hand, on the upper surface of the lowermost layer sheet 2a, a frictional force F is generated due to the weight (direct pressure) of the sheets stacked above the second stage sheet 2b, and the lowermost layer sheet 2a is generated.
2a front guide its upper surface of the sheet, the frictional force difference is generated in the lower surface (conveying force f = F _O -F occurring sheet)
11 It is sent out from the gap at the lower end, and is further conveyed to the printing unit P for the next process by holding and rotating the feed rolls 8a and 8b provided downstream. The printing section P is installed as the next step of the sheet feeding section R as described above, and is configured as follows. That is, a printing plate in which ink in an ink reservoir (not shown) is sequentially transferred and supplied by an inking roller and wound around the plate cylinder 15.
The corrugated cardboard sheet 2 is printed by passing between the printing plate 16 and the impression cylinder 17. By the way, the reference point A fixedly provided on the plate cylinder 15
Therefore, the relative positional relationship is set by the known indexing device 18 so as to correspond to the reference point N of the corrugated cardboard sheet being conveyed.

Next, the drawbacks of the sheet feeding device based on the lead edge system will be described. FIG. 4 shows the variation of the distance x from the sheet front end N to the print start position 10 with respect to the sheet length l (that is, the direct pressure due to the sheet weight). Shown, standard set length
As the sheet length l becomes longer than l ₀ (l ₀ → l ₂ ), the distance x becomes shorter (x = x ₀ −S _b ), and conversely, as the sheet length l becomes shorter ( l ₀ → l ₁ ) and the distance x is long (x = x ₀ −
S _a ).

(Problems to be solved by the invention) However, in the paper feeding device, this tendency is fixedly provided in the paper feeding portion R, and the sheet length l is reduced with respect to the frictional force F _O of the feeding roll 7 with little fluctuation. The frictional resistance F between the upper surface of the lowermost sheet 2a and the lower surface of the second-stage sheet 2b increases or decreases due to the change of the sheet, and the slip amount between the delivery roll 7 and the lower surface of the sheet 2a fluctuates. The relative positional relationship between the printing plate 16 and the printing plate 16 on the plate cylinder 15 is changed, and the printing position is displaced in the front-back direction of the sheet 2. Further, FIG. 5 illustrates the above-mentioned matters in detail with reference to the drawings. FIG. 5 (a) shows an ideal state, and FIG. 5 (b) shows a case where the paper feed timing is delayed and the paper feed timing is advanced. Each case is illustrated. However, the conventional type is shown in FIG. 5 (b).
It was difficult to deal with the situation shown in (corrective measures).

In the conventional lead edge type paper feeder,
Since the corrugated cardboard sheet becomes long, the frictional force between the lowermost layer sheet and the second-stage sheet increases, and there is a drawback that the sheet delivery timing in the sheet advancing direction is delayed due to insufficient transport output of the delivery roll. Therefore, the relative positional relationship between the printing plate wound around the plate cylinder and the traveling corrugated cardboard sheet changes, and as a result, the printing position on the corrugated cardboard sheet changes with respect to the traveling direction. Therefore, the weight (height) of the corrugated cardboard sheet on the table is limited, and the stock amount is insufficient, so that the machine speed cannot be increased and the productivity is reduced.

The present invention aims to improve the problems of the conventional lead edge type paper feeding device, particularly the delay of the paper feeding timing caused when the dimensions of the corrugated cardboard sheets (paperboards) stacked on the paper feeding table become long. It is intended.

(Means for Solving the Problems) Therefore, according to the present invention, the stacked paperboards are sequentially fed from the lowermost layer between the front guide and the backstop whose front and rear positions with respect to the front guide are adjustable, and the frictional force of the roll peripheral surface is increased. In a paperboard feeding device configured to be carried out by rotation with an endless belt which is in contact with the lowermost bottom surface of the rear part of the paperboard at a position where the paperboards having a predetermined length or more are stacked and which rotates in synchronization with the peripheral speed of the delivery roll or A roll with a timing belt is provided, which serves as a means for solving the problem.

(Function) In the present invention, the corrugated board sheet becomes longer, and even if the frictional force generated between the lowermost sheet and the second-stage sheet increases due to the change in weight (direct pressure), the lowermost sheet is conveyed. Since the force can be increased, the problem of delaying the paper feed timing is eliminated. Therefore, the height of the sheets stacked on the table (the number of stocks) can be increased, so that the machine speed can be increased and the productivity can be improved.

(Embodiment) The present invention will be described below with reference to embodiments of the drawings.
FIG. 2 and FIG. 2 are schematic configuration explanatory views of the sheet feeding device showing the first and second embodiments of the present invention.

First, FIG. 1 shows a first embodiment, in which a paperboard (cardboard sheet) having a predetermined length or more is stacked on a paper feed table 1 in addition to a conventionally known lead edge type paper feed unit R. , One on which a guide roll 3a, 3b and 3c is wound to run and which is located on the lower surface of the rear part of the corrugated cardboard sheet 2, or a plurality of endless belts 4 are arranged, and a gear 5 fixed to the guide roll 3a is provided. Is engaged with the gear 6 of the conventional apparatus, the endless belt 4 can rotate and run in synchronization with the peripheral speed of the delivery roll 7.

Next, the operation will be described. When the dimensions of the corrugated cardboard sheets 2 stacked on the paper feed table 1 are not less than a predetermined length l ₂ , the lower surface of the rear portion of the corrugated cardboard sheets 2 is in contact with the conveying force (friction force) of the endless belt 4. F _b ), the lowermost sheet 2 a is carried out to the gap between the downstream feed rolls 8 a, 8 b at a predetermined timing in combination with the carrying force (friction resistance F _a ) of the sending roll 7. Length l of corrugated cardboard sheet 2 (direct pressure due to weight)
The variation of the frictional force F between the lowermost sheet 2a and the second-stage sheet 2b related to the above is small compared with the increase of the conveying force by the endless belt 4 (acting force).
Therefore, the influence on the delay of the paper feed timing is small,
Therefore, the paper feeding accuracy is improved significantly. When the length is less than a predetermined length (l _{0 in the} figure), the delivery roll 7 is the same as the conventional type.
It is conveyed to the next process by the rotational drive of the section.

FIG. 2 shows a second embodiment, in which the endless belt 4 shown in FIG. 1 is replaced with a plurality of rolls 9 which rotate in synchronization with the peripheral speed of the feed roll 7, whereby The function similar to that of the embodiment is obtained. The embodiment shown in FIG. 2 is characterized in that when the size of the corrugated board sheet 2 becomes long, the delay of the sheet feeding timing can be corrected by supplementing (increasing) the conveying force to the downstream process. is there. Also each roll 9
Are rotationally driven synchronously from the gear 5 by a timing belt 4 '. In addition, the endless belt 4 and the roll 9
The driving method and the control such as the intermittent rotation of the belt 4 and the roll 9 may be other than those illustrated.

(Effects of the Invention) As described in detail above, the present invention is provided with an endless belt or roller that comes into contact with the lowermost surface of the rear part of the paperboard and rotates in synchronization with the peripheral speed of the delivery roll. However, since the conveying force for the lowermost sheet can be increased, the delay of the sheet feeding timing can be minimized and the printing quality can be improved. Moreover, since the number of corrugated cardboard sheets stacked on the paper feeding table can be increased, the machine speed can be increased, and the productivity can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a sheet feeding device showing a first embodiment of the present invention,
FIG. 2 is a side view of a paper feeding device showing a second embodiment of the present invention,
FIG. 3 is a side view of a conventional lead edge type paper feeding device,
FIG. 4 is a diagram for explaining the defects of the conventional sheet feeding device of the lead edge system, and FIG. Explanation of the main parts of the figure 1 …… Paper feeding table 2 …… Corrugated cardboard sheet (paperboard) 2a …… Bottom layer sheet 2b …… Second stage sheet 3a, 3b, 3c …… Guide roll 4 …… Endless belt 4 ′… … Timing belt 5 …… Gear 6 …… Gear 7 …… Sending roll 8a, 8b …… Feed roll 9 …… Roll 10 …… Backstop 11 …… Front guide 12 …… Suction box

Claims (1)

(57) [Scope of utility model registration request] Claims: 1. A paperboard feeding device configured to sequentially feed stacked paperboards from a lowermost layer between a front guide and a backstop whose front-rear position with respect to the front guide is adjustable, and carry out by frictional force and rotation of a roll peripheral surface. In a paper machine, an endless belt or a roll with a timing belt, which comes into contact with the lowermost surface of the rear part of the paperboard and rotates in synchronization with the peripheral speed of the delivery roll, is arranged at a position where the paperboard having a predetermined length or more is stacked. Characteristic paper feeding device.