JPH04298453A - Overlap forming method and device for sheetlike object - Google Patents

Abstract

PURPOSE:To enable secure overlapping by means of a simple facility by conveying each sheet-like object so that the tip of a following sheet-like object reaches above the rear end of a preceding sheet-like object at a position where difference in height between the locus of the tip of the following sheet-like object and the locus of the rear end of the preceding sheet-like object becomes the maximum. CONSTITUTION:Difference in height Y3 between the locus 1a of the tip of a following sheet-like object and the locus 1b of the rear end of a preceding sheet-like object is expressed by a predetermined equation. The difference in height Y3 becomes large once when X becames large, becomes small after it passes the maximum value, and is shifted to zero. Each sheet-like object is conveyed so that the tip of the following sheet-like object reaches a position just above the rear end of the preceding sheet-like object at the position P where difference in height Y3 between the locus 1a of the tip of the following sheet-like object and the locus 1b of the rear end of the preceding sheet-like object becomes the maximum. Owing to this constitution, the tip of the following sheet-like object superposed with secure up and down relation on the rear end of the preceding sheet-like object to form stable overlapping.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method and apparatus for forming overlapped sheets, and more specifically, the present invention relates to a method and apparatus for forming overlapped sheets, and more specifically, a plurality of sheet-like objects are conveyed by two conveying sections having different speeds, and a plurality of sheet-like objects are conveyed after the preceding sheet-like object. The present invention relates to a sheet-like object overlap forming method and apparatus for overlapping an end portion and a leading end portion of a subsequent sheet-like object.

0002

[Background Art] Sheet-like materials such as paper and plastic are cut into predetermined lengths from a long raw material using a cutting device, and then sequentially transported along a transport path, followed by removal, packaging, etc. Therefore, accumulation is performed while falling from the conveyance path at the end of the conveyance path. It is also necessary to leave gaps between individual sheets at the exit of the cutting device.
Once conveyance is performed at high speed, it is necessary to reduce the conveyance speed to a speed at which the sheet-like materials can be accumulated before the stacking step.

[0003] For the above purpose, the speed of some downstream conveyance sections is generally set lower than the speed of the adjacent upstream conveyance section. In this case, when transferring from a high-speed conveyance unit to a low-speed conveyance unit, the leading edge of the succeeding sheet is overlapped on the trailing edge of the preceding sheet for accumulation in the next process, so-called overlap is formed. be done.

[0004] When forming an overlap, if the sheets are stacked upside down, the sheet-like materials may be bent or damaged as they fall and accumulate. For this reason, various methods and devices for forming an overlap have been tried in the past in order to ensure that the layers are overlapped without changing the vertical relationship.

[0005] As the above-mentioned method, for example, a method of lifting the subsequent sheet-like object through a guide or a method of lifting it using magnetic force etc. has been tried, but if the sheet-like object is lifted by an external force, the sheet-like object may be damaged. There is also a problem that the method using magnetic force is limited to specific sheet-like materials.

[0006] Japanese Patent Laid-Open No. 2-86541 discloses one of the overlap forming apparatuses. In the device disclosed in the same publication, two air flow generation means are provided between the upstream conveyance section and the downstream conveyance section, one of which pushes up the leading edge of the following sheet, and the other pushes up the leading edge of the preceding sheet. By pushing the trailing edge downward, overlapping is performed such that the leading edge of the trailing sheet is reliably positioned above the trailing edge of the preceding sheet. According to this device, it is possible to reduce the friction that acts between the sheet-like objects when stacking them, and since the external force that acts on each sheet-like object is air, there is little risk of damaging the sheet-like objects. There is an advantage.

[0007]

[Problems to be Solved by the Invention] In the case of the overlap forming device described in the above publication, there is little risk of damaging the sheet-like objects during overlapping, but it is difficult to control the vertical relationship of the sheet-like objects using fluid. Therefore, it cannot be said that the control is necessarily carried out stably, and there is a problem in that the reliability of overlay is lacking.

Furthermore, since two airflow generation means are required to generate airflow in each direction, there are problems in that the equipment becomes complicated and it is difficult to arrange them.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional overlap forming apparatus, an object of the present invention is to provide an overlap forming method that does not cause damage to sheet-like objects and allows reliable overlapping with simple equipment; It is an object of the present invention to provide an overlap forming device for sheet-like objects that can select optimal overlapping conditions depending on the size, material, rigidity, etc. of the sheet-like objects.

0010

[Means for Accomplishing the Object] In order to achieve the above-mentioned object, the method for forming an overlap of sheet-like materials according to the present invention includes a method for forming a plurality of sheet-like materials in sequence at a first speed. a second conveyor having an upstream end adjacent to a downstream end of the first conveyor from the first conveyor and conveying the sheet at a second speed lower than the first speed; a sheet-like material for overlapping a trailing end of the preceding sheet-like material and a leading end of the following sheet-like material on the second conveying section by a difference between the first and second speeds; In the overlap forming method, the conveying direction of the upstream end of the second conveying section is directed downward relative to the conveying direction of the downstream end of the first conveying section, and the leading edge of the subsequent sheet-like object is Each of the sheets is moved so that the leading end of the succeeding sheet reaches above the rear end of the preceding sheet at a position where the height difference between the trajectory of the leading sheet and the trailing end of the preceding sheet is maximum. It is characterized by conveying objects such as

[0011] Furthermore, the sheet-like material forming apparatus of the present invention includes:
An apparatus for carrying out the method for forming an overlap of sheet-like objects according to the present invention, which comprises: a first conveyance section that sequentially conveys a plurality of sheet-like objects at a first speed; and a downstream side of the first conveyance section. a second end portion adjacent to the side end portion and having an upstream end portion having a conveying direction downward than the conveying direction of the downstream end portion, and conveying the sheet-like material at a second speed lower than the first speed; a conveyance section, and an angle adjustment means for variably setting an angle formed between the conveyance direction of the downstream end of the first conveyance section and the conveyance direction of the upstream end of the second conveyance section; The present invention is characterized by comprising speed adjusting means for variably setting at least one of the first and second speeds.

0012

[Operation] In the method for forming a sheet-like article of the present invention, the conveying direction of the upstream end of the second conveying section is directed downward relative to the conveying direction of the downstream end of the first conveying section, and the subsequent sheet-like article is Each sheet is conveyed so that the leading edge of the succeeding sheet reaches above the rear end of the preceding sheet at the position where the height difference between the respective trajectories between the leading edge and the trailing edge of the preceding sheet is maximum. With this configuration, by using only the laws of nature without using external forces such as airflow, magnetic force, or guides, the rear end of the preceding sheet-like object and the following sheet-like object can be easily separated, despite the extremely simple structure. can be superimposed so that the vertical relationship between the top and bottom ends is ensured.

Further, in the sheet-forming apparatus of the present invention, the angle between the conveying direction of the downstream end of the first conveying section and the conveying direction of the upstream end of the second conveying section is variable. By including an angle adjustment means for setting and a speed adjustment means for variably setting at least one of the first and second speeds, various materials, shapes, rigidities, etc. can be adjusted by adjusting and setting the angle and speed. It is possible to easily apply this method to each sheet-like object having the above-mentioned structure, and to perform overlapping that ensures the vertical relationship.

[0014]

[Embodiment] FIGS. 1 and 2 are a plan view and a side view, respectively, showing a cutting/conveying device including a sheet-like material forming device, a cutting device at a preceding stage thereof, and an upstream conveying section according to an embodiment of the present invention. be. The rotary cutting device 2 cuts a long sheet-like material into a predetermined length, performs cutting at a cutting speed V where V is the conveyance speed of the sheet-like material at the exit, and sequentially cuts the sheet-like material to an upstream conveyance section. Supply to 3. The upstream conveyance section 3 has a speed V
Each cut sheet-like material 1 fed at a speed v1 (v
1 = 1.5 V). Due to the difference between the cutting speed V and the conveying speed v1, each sheet-like object 1 is conveyed at a predetermined interval of 0.5 L on the upstream conveying section 3.

The first conveyance section 4 is provided adjacent to the downstream side of the upstream conveyance section 3, and is driven by the main drive motor (not shown) of the cutting device 2 via a transmission, and has a conveyance speed v2. It is variably set in the range of 1.0 to 3.0 V. Note that instead of the drive motor of the cutting device, it can also be directly driven by a dedicated variable speed motor.

The second conveyance section 5 is provided with its upstream end adjacent to the downstream end of the first conveyance section 4, and whose conveyance speed is approximately 1/2 to 1/2 of the first conveyance speed v2. It is fixedly set at a speed v3 of 1/3. The second conveyance section 5 is rotatably supported by a fixed frame 6 around the center of a pulley 4b at the downstream end of the first conveyance section 4, and has an angle adjustment means connected to the downstream end. motor cylinder device 5c
is rotated around the pulley 4b at the downstream end of the first conveyance unit 4, and the conveyance angle θ is adjusted and set. The motor cylinder device 5c is driven by a motor, and the stop position of the motor is variably set.

A first touch roller is provided vertically above the pulley 4b at the downstream end of the first conveying section 4, and is provided with a gap between the pulley 4b and the pulley 4b to allow the passage of the sheet material 1. 4a is provided, and the sheet-like material 1 is reliably fed out by this touch roller 4a, and furthermore, the rear end of the sheet-like material is prevented from jumping up. A second touch roller 5a is provided at the upper part of the second conveyance section 5, and the second touch roller 5a is disposed so as to be movable in the conveyance direction via a rod of an air cylinder device 5d. Note that a sandwich conveyor may be used instead of the touch rollers 4a, 5a.

The sheet cutting and conveying apparatus including the overlap forming apparatus according to the embodiment of the present invention constructed as described above operates as follows. The long sheet-like material is supplied to the rotary cutting device 2 at a conveyance speed V, and is cut into a cut length L by the cutting device. Each cut sheet-like material 1 is sent in the direction of the first transport section with a mutual interval maintained at 0.5 L by the speed v1 of the upstream transport section 3. Next, the sheet-like material 1 is conveyed on this first conveyance section, with the mutual interval variably set to a predetermined value in the range of 0 to 2 L according to the set speed v2 of the first conveyance section. Ru.

[0019] This will be explained below with reference to FIG. Figure 3 is Figure 2
is a partially enlarged view showing a portion where the first and second conveyance sections are adjacent to each other. After the leading edge of the sheet-like material 1 reaches the touch roller 4a, the rear end of the sheet-like material 1 reaches the touch roller 4a.
Until it passes through point a, it is fed at the conveying speed v2 of the first conveying section.

[0020] At this time, the leading end of the subsequent sheet-like material moves from the first conveying section 4 to the trajectory 1a according to its own weight and the rigidity of the material.
, and reaches the second transport section 5. This trajectory 1a is
The direction of movement of the sheet on the first conveyance unit 4 is defined as the x-axis,
The y-axis is a vertical line passing through the center of both the first touch roller 4a and the pulley 4b at the rear end of the first conveyance unit and pointing downward, and is expressed by the following curve y1: y1 = wx4 /8EI. However, w is the unit length weight of the sheet material, E
I is the bending rigidity of the sheet material. Further, the rear end of the preceding sheet-like material is conveyed according to the conveyance direction of the second conveyance section,
Since the line extending backward from the rear end of the second conveying section passes approximately the origin O, the trajectory 1b is expressed by the equation of the following straight line y2, y2
=xtan θ.

Therefore, the trajectory 1a of the leading edge of the subsequent sheet-like material
The height difference y3 between the trajectory 1b of the trailing edge of the preceding sheet-like object and the trailing edge 1b is calculated using the following formula: y3 = y2 - y1 = xtan θ - wx4 /8
It is expressed as EI. As shown in FIG. 3, this height difference y3 increases once x increases, and after reaching the maximum value, decreases and shifts to zero.

In the method for forming a sheet-like object of this embodiment, the following sheet-like object is Each sheet is conveyed such that the leading edge of the sheet reaches vertically above the rear end of the preceding sheet. With this configuration, the leading edge of the succeeding sheet is overlapped with the rear end of the preceding sheet while ensuring a vertical relationship,
Stable overlap is formed. In addition, the value of the x coordinate at this time, the overlap starting point X, is X=v2
{L(v3/V-1)-m(v3/v2-1)}
/(v2-v3). However, m is the distance between the center of the second touch roller 5a and the origin O.

[0023] In the overlap forming apparatus of this embodiment,
In order to match the value of the x-coordinate at which the height difference y3 has the maximum value with the coordinate X of the overlap start point, the upstream end of the second conveyance section 5 is The angle θ between the conveying direction and the conveying direction of the downstream end of the first conveying section 4, and the conveying speed v2 of the first conveying section 4 are adjusted by the speed adjusting means. With this configuration, in the sheet-like object overlap forming apparatus of this embodiment, the self-weight of the sheet-like object being conveyed,
The angle and speed are set according to the rigidity EI and the cut length L, and the optimum overlap forming conditions can be selected for each sheet-like object.

In the above embodiment, the height difference y is the height of the leading end of the subsequent sheet-like object from the second conveyance section.
We have given an example in which the x-coordinate of the leading edge of the succeeding sheet-like material matches the x-coordinate of the trailing end of the preceding sheet-like material at the position where 3 is the maximum, but as another example, the leading edge of the succeeding sheet-like material
When the height difference y3 reaches the above-mentioned X coordinate, the trajectory 1 of the preceding sheet-like object starts from the tip of the succeeding sheet-like object.
It can also be assumed that the trailing end of the preceding sheet object is located at a position Q where the perpendicular line drawn down to b intersects with the locus 1b.

The above-mentioned positional relationship is such that the leading end of the succeeding sheet-like material is located above the rear end of the preceding sheet-like material when viewed from the second conveying section 5. Incidentally, such a positional relationship does not necessarily have to be a strict positional relationship, and if there is an idea of such a positional relationship, the vertical relationship between the sheet-like objects can be ensured, and the effects of the present invention can be achieved. Can be done.

[0026] The cutting and conveying device including the overlap forming device of the above embodiment is adopted, and as an example, the cut length L of the sheet-like material is 350 mm, the width b is 355 mm, and w/
EI is 8. For a plastic sheet of 8 x 10-7 mm-3, V = 50 m/min, v1 = 75 m/m
in, v2 = 80m/min, v3 = 25m/
Cutting and cutting under the conditions of min, θ = 20 degrees, m = 355 mm.
Conveyance and overlap formation were performed. the result,
It was confirmed that the vertical relationship was reliable and that an overlap was formed that did not cause any damage to the sheet-like object.

Furthermore, as another example, the cut length L is 28
0mm, width b is 355mm, w/EI is 1.2 x 10-
V=50m/for 5mm-3 plastic sheet
min, v1 = 75m/min, v2 = 6
5m/min, v3 = 25m/min, θ=30
Cutting, conveyance, and overlap formation were performed under the condition that m = 285 mm. As a result, it was confirmed that an overlap was formed with a reliable vertical relationship and no scratches on the sheet-like object.

FIG. 4 is a perspective view of a touch roller employed in an overlap forming apparatus according to another embodiment of the present invention. Instead of the previous embodiment, the pulley of the first conveying section is configured as another touch roller 4b, and this touch roller 4b and the first touch roller 4a are each divided into axially divided touch rollers. Each divided touch roller 4a, 4 divided in the axial direction
b are formed to have different diameters. With this configuration, the sheet-like object is curved in the width direction so as to be convex downward in the case of the figure, or alternatively, the sheet-like object is undulated to compensate for the lack of rigidity, and the above-mentioned conveyance speed and In addition to adjusting the angle, it increases the rigidity of the sheet-like object.

In each of the above embodiments, the first touch roller provided on the first conveying section ensures that the trailing edge of the preceding sheet material is firmly brought into close contact with the second conveying section on the second conveying section. As a result, the stable vertical relationship achieved by the present invention can be further ensured. However, providing this touch roller is not an essential requirement of the present invention. Similarly, providing an upstream conveyance section is not an essential requirement of the present invention.

[0030] In addition, in the above embodiment, an example was given in which the effect of the present invention was confirmed using a plastic sheet, but the method and apparatus for forming an overlap of a sheet-like material of the present invention can be applied to other materials other than plastic sheets, such as paper, etc. Applicable to all metal sheets and signatures.

Further, in the above embodiment, an example was given in which both the first and second conveyance sections have a linear conveyance direction, but for example, when a sheet is formed with only the rear end of the first conveyance section facing upward, You can also make it so that only the tip of the object is lifted,
In this case, the conveyance directions of both conveyance units can also be made substantially horizontal. Moreover, instead of this, the conveying direction of the first conveying section may be upward, and the conveying direction of the second conveying section may be horizontal.

[0032]

[Effects of the Invention] According to the sheet forming method of the present invention, overlapping is started at the position where the height difference between the respective trajectories of the leading edge of the succeeding sheet-like material and the rear end of the preceding sheet-like material is maximum. Therefore, despite the extremely simple structure that uses only the laws of nature without using external forces such as airflow, magnetic force, or guides, the tip of the succeeding sheet and the rear end of the preceding sheet It is possible to provide an overlap forming method that performs overlapping to ensure the vertical relationship of the parts, thereby facilitating the stacking process that follows the cutting and conveying process.

[0033] Furthermore, the sheet-like material forming apparatus of the present invention includes:
Since it is equipped with an angle adjustment means and a speed adjustment means, by adjusting and setting the conveyance angle and conveyance speed through these adjustment means, it is easy to handle various sheet-like objects having various materials, shapes, rigidities, etc. Accordingly, it is possible to provide an overlap forming device for sheet-like objects in which the leading end of the succeeding sheet-like object reliably overlaps the trailing end of the preceding sheet-like object.

[Brief explanation of drawings]

FIG. 1 is a plan view of a cutting/conveying device including an overlap forming device according to an embodiment of the present invention.

[Figure 2] Side view of the cutting/conveying device in Figure 1

[Figure 3] Partially enlarged view of Figure 2

FIG. 4 is a perspective view showing a part of an overlap forming device according to another embodiment of the present invention.

[Explanation of symbols]

1 Sheet-like object 1a Trajectory of the tip of the following sheet-like object 1b
Trajectory 2 of the trailing edge of the preceding sheet-like object
Cutting device 3 Upstream conveyance section 4 First conveyance section 4a First touch roller 5 Second conveyance section 5a Second touch roller

Claims (2)

[Claims] Claim 1: A plurality of sheet-like objects are transported from a first conveying section that sequentially conveys the sheet-like objects at a first speed to an upstream end adjacent to a downstream end of the first conveying section. the sheet-like material is conveyed at a second speed lower than the first speed; In a method for forming an overlap of a sheet-like material for overlapping a rear end of a preceding sheet-like material and a leading end of a subsequent sheet-like material,
The conveying direction of the upstream end of the second conveying section is set downward relative to the conveying direction of the downstream end of the first conveying section, and the trajectory of the leading edge of the succeeding sheet-like object and the preceding sheet-like object are At the position where the height difference of the trail of the object's rear end is maximum,
An overlap forming method characterized in that each of the sheet-like objects is conveyed so that the leading end of the succeeding sheet-like object reaches above the rear end of the preceding sheet-like object. 2. A first conveyance section that sequentially conveys a plurality of sheet-like objects at a first speed; a second conveyance section that also has an upstream end having a downward conveyance direction and conveys the sheet at a second speed lower than the first speed; and a second conveyance section downstream of the first conveyance section. An angle adjusting means for variably setting an angle between the conveying direction of the side end portion and the conveying direction of the upstream end portion of the second conveying section; and at least one of the first and second speeds. 2. An apparatus for forming an overlap of a sheet-like material for carrying out the method according to claim 1, further comprising a speed adjusting means for setting a speed at .