JPS5943377B2 - Equipment for sheet feeding and stacking - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a first conveyor band that runs at high speed;
A second conveyor band running at a lower speed following the conveyor band in the feed direction and arranged lower, and a higher speed conveyor band arranged above both of these conveyor bands, above the second conveyor band. A device for feeding and stacking sheets or stacked sheets delivered from a feeding device, e.g. a cutting device, in which a suction box connected to a suction source is arranged below the connection point of the suction box at an angle with respect to the feeding direction. It is related to.

For example, sheet delivery devices, such as cutting devices, are driven at high speeds so that the sheets can be properly stacked on the transport path for storage.

This also requires a large deceleration of the sheet. The degree of reduction is preferably about ⅓ of the above speed.
Cutting devices typically cooperate with multiple feed paths to deliver stacked sheets.

The individual sheets of the stack must not be displaced relative to each other during stopping. In particular, the processing of matte or glossy marking paper must not produce any wrinkles or deviations that would render it unusable. After processing, the sheets are cut into various lengths. Therefore, the mechanical energy that has to be removed from the sheet or stack of sheets during stopping changes. This braking process is instantaneous;
And you must be able to control the strength. Note that in the following, the concept of sheet (BOgen) also includes stacked sheets.

Overlapping of the delivered sheets is accomplished by speeding up the sheets to eliminate the spacing between them and the preceding sheet.

This spacing is extremely important for the trouble-free stacking of the sheets during the formation of stacks. Furthermore, in performing the overlap, it is necessary to deflect the trailing edge of the preceding sheet away from the trajectory of the leading edge of the following sheet. In known devices, air suction is used for polymerization.

Sheets are fed from a conveyor band that travels at high speed.
The rear edge is attached to the soil of the conveyor band, which is located at a slightly lower position than the conveyor band and runs at a low speed,
The braking force drives the leading edge of the trailing sheet over the rear of the sheet, resulting in an overlap. The height difference between both conveyor bands ensures trouble-free overlapping. In order to prevent wrinkling of the decelerated sheet, the deceleration action must be carried out safely with respect to the trailing edge of the sheet during the transition from a high-speed conveyor band to a low-speed conveyor band.

As a result, the sheet is straightened and maintained in this planar position. Also, for example, the Chiyotsuhisog device (
It is known to arrange a mechanical device such as an air injection device or an air injection device on the upper surface of the sheet to be transferred.

In German Patent Publication No. 12 45 702, the above-mentioned mechanical devices are excluded.

Instead, it includes a compressed air nozzle rotating in a stationary or stationary casing that blows the trailing edge of the sheet downward onto a slow-moving conveyor band. This further includes a suction device in the form of a suction box cooperating with the compressed air nozzle below the upper seam for support. However, German Patent Publication No. 14
11325, the above implementation is difficult because the inertia of the mechanical compressed air system in the case of a fixed nozzle, and the gravity and uncontrolled air flow in the casing in the case of a rotating nozzle. The style has not been put into practical use. German Patent Publication No. 1917616 (Japanese Patent Publication No. 1917-16122) states that ``From paper, etc. whose end in the direction of sheet movement reaches the range of a suction braking device equipped with a suction chamber that operates periodically. In a device for braking and overlapping sheets placed on a paper take-up tray, a hole in a suction chamber covered by a control belt with holes is continuously According to the period of movement of the sheet to be moved, the control belt with the holes is overlapped with the holes, in which case the control belt with the holes is movable between the suction chamber with the holes and the cover plate with holes drilled equally with this suction chamber. Braking a sheet such as paper placed on a paper pick-up table, which is characterized by being provided with a
Overlapping equipment.

However, the structure is complicated and the timing control of the control belt and cover plate is extremely difficult. The present invention improves a conventional device of this type, overcomes the drawbacks of the known device, and allows sheets or stacks of sheets to be fed at high speed to be stacked and accommodated using only suction air, and also to accommodate various types of devices. The object of the present invention is to provide a highly efficient device that can be extremely easily adjusted in terms of length and weight.

According to the present invention, this problem is solved as follows. That is, in the present invention, a suction tube with a long groove is rotatably disposed below the suction opening in the suction box, and this suction tube turns (rotates) the sheet and is positioned around the suction tube. This is achieved by communicating with the suction opening in the area between the sealing elements. Since the suction tube rotates at a suitable speed, it is possible to avoid creating any inertial forces within the device. Furthermore, since the suction tube is covered by the sealing member with respect to the space inside the suction box, turbulence and/or pulsation will not occur within this space. The area (range) that the long groove of the suction pipe is open to the suction opening of the suction box, that is, the rotation angle, can be adjusted by changing the mutual spacing of the sealing members, and can therefore be adapted to various sheet lengths. be able to. The suction tube is connected at one end, preferably at both ends, to a suction source by a conduit.

In this case, in one embodiment of the invention, in order to equalize the suction over the entire length of the elongated groove, holes or perforated plates whose diameter decreases from the center towards the ends are inserted. In order to be able to maintain the same suction force independently of the speed of the sheet feeding device, in another embodiment of the invention a bypass line is connected to the conduit connecting the suction tube to the suction source, and the The cross-sectional area of the passage can be controlled depending on the speed of the paper feeding device. This configuration is similar to the suction box (German Patent Publication No. 1917)
Regarding the adjustment based on the change in the hole cross section of Publication No. 616),
It has the advantage that it does not require any changes within the device. Hereinafter, the present invention will be described in more detail based on illustrated embodiments.

As shown in FIG. 1, a continuous paper 1 being fed at a speed V1 from a rewind roll (not shown) is separated into individual sheets 3 in a cutting device 2. As shown in FIG.

The sheet 3 leaving the cutting device 2 then consists of an upper conveyor band 4 and a lower conveyor band 5, both bands 4
, 5 to form a conveying path or plane 6 between them, and the higher speed V2 (V2Zll.2.
V1). Spacing is thus created between each sheet 3 and preparation is made for subsequent superposition. When the sheet 3 reaches the support angle 7 from the conveyor band 5, the longitudinal edges of the sheet are deflected ~upwards by the shaped part of the support angle 7, so that the sheet is thrust up about a short free path.

Then, the sheet 3 passes over the guide drum 8 located below the drive roll 9 and consists of an upper conveyor band 4 and a lower conveyor band 10 with a small speed 3 (V3 and 0.2-0.3V1). The second band conveyor is reached. The conveyance path or plane 11 formed between the conveyor bands 4 and 10 is located lower than the conveyance path 6 by about 5 to 10 mm. With respect to the upper surface of the guide drum 8, the conveyor 10 is inclined downwardly by about 20 mm over a length of about 250 mm in the conveying direction. A suction box 12, the structure of which will be explained in detail later, is arranged below this slope. A support roll 13 is disposed below the lower conveyor band 10 at an interval equal to the sheet length from the beginning of the lower conveyor band 10 (the starting point of the inclination), and a sheet is disposed above the upper conveyor band 4. A gripping roll 14 is arranged which exerts an adjustable pressing force.

Behind this gripping roll 14, the upper conveyor band 4 is lifted off from the lower conveyor band 10,
The polymerized sheets are finally conveyed to the stacking container 15. According to known methods, the superposition of the sheets is carried out as follows. The sheet 3, whose side edges are lifted by its progress on the support angle 7 above the guide roll 8 with respect to the conveyor band 10, has its leading edge sunk due to the small gap between the soil side and the lower conveyor bands 4, 10. There is no possibility of it bending, sagging, or therefore bending. This also does not create undulations that would give rise to creases. When the trailing edge of the sheet 3 passes while being held between the guide roll 8 and the drive roll 9, the sheet 3 itself is in a state where it can fly freely. After this point, the suction box 12
sucks the air below the edge of the sheet 3, whereby the edge of the sheet is attracted to the transport band 10 running at low speed. The friction between the sheet 3 and the conveyor bands 4, 10 brakes the sheet in its rear region and stretches it flat. When the leading edge of the sheet 3 reaches the gripping rolls 14, it is realigned and pressed against the conveyor band 10 by this roll, when the sheet 3 is to be conveyed a short distance in its conveying direction. Figures 3 to 5
The figures up to the figure show the structure of the suction box 12.

A suction tube 16 having a long groove 17 is rotatably arranged inside the suction box 12, and this suction tube 16 is connected to the sheet 3.
It is driven synchronously with a certain difference (lag) relative to the cutting device 2 so that it rotates once during the passage of the cutting device 2 . The long groove 17 is
Therefore, at a predetermined timing, the two sealing members 1
8, each sealing member 18 can be adjusted via manual operating means (not shown) by means of a slider 19 for adjusting the suction time. By this method, the opening angle of the long groove 17 can be changed within the range of α to β in terms of the rotation angle of the suction tube 16. A small rotation angle α is large for a short sheet (・Rotation angle β
are set for each long sheet. The suction tube 16 is connected at both ends to a suction source.

In order to obtain the same amount of suction regardless of the speed of the cutting device 2, low-speed dilution air is guided through a bypass (not shown), which increases as the speed of the sheet increases. Preferably, they can be closed continuously. When suctioning air through the suction tube 16, more air is sucked in at the ends of the suction box 12 than at the center. Therefore, the end portion of the sheet adsorbed to the soil of the conveyor band 10 is not displaced downward uniformly and simultaneously over its entire width. Therefore, in that case, a problem arises in that the leading edge of the succeeding sheet pushes up the portion of the trailing edge of the preceding sheet that has not been completely lowered. The perforated plate 20 inserted into the suction tube 16 has a large number of holes 21 in its longitudinal direction, and the total cross section of these holes corresponds to the suction tube 16.
This reduces the increase in flow velocity and the unavoidable but disadvantageous flow resistance in the suction tube.

These holes 21 are arranged at narrower or smaller intervals in the center than in the ends. That is, by increasing the density of the holes 21 at the center than at the ends, the suction force of the suction tube, which is weaker at the center and stronger at the ends, is compensated for. Thereby, a uniform suction effect can be provided over the entire suction width of the suction box 12. As is clear from the above,
The present invention can effectively achieve the intended purpose.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the conveying device from the cutting device to the stacking containers, Fig. 2 is a side view showing how continuously conveyed sheets are stacked, and Fig. 3 is a view of the suction box and suction tube. FIG. 4 is an enlarged longitudinal sectional view of the suction tube with the suction box and perforated plate, and FIG. 5 is a plan view of the perforated plate inserted into the suction tube. 2... Cutting device, 3... Sheet, 4...
...Upper conveyor band, 5. ．． 、． ．． ．． lower conveyor band, 6. ．． ．． ...Conveyance path, 7...
Support angle, 8... Guide roll, 9...
... Drive roll, 10 ... Lower conveyor band, 11 ... Conveyance path, 12 ... Suction box,
13... Guide roll, 14... Drive roll, 15... Stacking containers, 16...
Suction pipe, 17... Long groove, 18... Sealing member, 19... Slider.

Claims (1)

[Claims] 1. A first conveyor band running at high speed, a second conveyor band running at low speed connected to the first conveyor band in the feeding direction and disposed lower, and above both of these conveyor bands. a high-speed conveyor band located below the upper connection of the second conveyor band;
A sheet delivered from a feeding device, for example a cutting device, in which a suction box with a suction opening and a rotatable suction tube with a long groove is arranged, such that the suction opening and the long groove are temporarily aligned. Alternatively, in a device for feeding and stacking stacked sheets, a suction tube 16 connected to a suction source is provided inside a suction box 12 tilted in the feeding direction so as to rotate once for each sheet or stacked sheets. , the long groove of the suction tube is a sealing member 1 that contacts the periphery of the suction tube.
8, the sheet is adapted to communicate with the suction opening in a region between 8 and 8, and the region is adjusted by changing the spacing of an adjustable sliding member 19 to which a sealing member is fixed. Equipment for feeding and stacking. 2. In the device for feeding and stacking sheets as described in claim 1, a perforated plate 20 is inserted into the suction tube 16 in order to equalize suction in the direction of the long groove, and the perforated plate 20 is inserted into the suction tube 16. Or, the diameter decreases from the center toward the ends. 3. In the device for feeding and stacking sheets as set forth in claim 1, a bypass passage is connected to the guide path from the suction pipe 16 to the suction source, and the cross section of the passage is the same as that of the sheet feeding device. Something that can be controlled in relation to speed. 4. A device for feeding and stacking sheets according to claim 1, characterized in that the suction tube 16 is driven synchronously with the sheet feeding device with a certain difference.