JPH0569954A - Sheet feed device - Google Patents

Abstract

PURPOSE:To provide a sheet supply device capable of continuously supplying piled sheets in overlapped condition. CONSTITUTION:Piled sheets 14 are loaded on an elevatable conveyor 11, a decided quantity of the sheets is pushed out with a push-out device 16 provided on the upper part by a block unit, and let fall in an accumulator part 23. The accumulator 23 is constituted to be elevatable. and when the sheet block is commenced to fall, it is brought down and stopped on the lower limit. The sheet block let fall is loaded on and delivered with a non-slip belt provided on the lower part in overlapped condition. When supply of the sheet block is stopped or interrupted, the accumulator part is elevated while delivering the sheet till supply of the sheet block is reopened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device for continuously feeding stacked sheets of corrugated cardboard material to a printing machine or the like.

[0002]

2. Description of the Related Art A conventional sheet feeding apparatus for feeding corrugated cardboard or the like, while raising sheets 52 stacked on a conveyor 51 by a lifter 53 as shown in FIG.
The uppermost sheet is sequentially adsorbed by the adsorption device 54 provided in the upper part, overlapped on the conveyor 56 and sent out, and supplied to the next process. For example, when the next step is printing, the sheets are once stacked on the hopper 57 provided in the front stage of the plate cylinder of the printing machine, and the sheet is placed on the plate cylinder by a kicker (not shown) provided below the hopper. Protruding in the direction. In such a sheet feeding device, when there are no more sheets on the lifter 53, the lifter is lowered, a next fixed amount of stacked sheets is placed on the conveyor 51, and the lifter 53 is raised again to resume sheet feeding. is doing. During this period, the sheet supply is interrupted.

[0003]

Recently, printing speeds of printing machines have become extremely high (for example, 30 minutes per minute).
Therefore, the amount of sheets stacked in the hopper of the printing machine cannot be used. This is because the hopper feeds the lowermost sheet with a kicker, and when a large number of sheets are stacked, the product pressure increases and the kicker does not operate normally. Therefore, the printing speed of the printing press must be kept low while the sheet feeding of the sheet feeding device is interrupted. However, if the printing speed is slowed down, there is a problem in that the print density is shaded and the print quality is degraded.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sheet feeding device which can continuously feed sheets without interruption.

[0005]

SUMMARY OF THE INVENTION According to the present invention, in a sheet feeding apparatus for feeding stacked sheets in an overlapped state, a first lifting means for lifting the stacked sheets and a rising sheet are provided. Extruding means for extruding in block units from the upper sheet, feeding means for feeding the block of sheets extruded from this extruding means, and the block of sheets dropped through this feeding means are accumulated and accumulated. An ascending / descending accumulating means for feeding out the fed sheet in an overlapped state, and a second means for elevating / lowering the accumulating means.
And a means for raising and lowering.

According to the present invention, the first elevating means is
The conveyor comprises a conveyor and a first lifter for moving the conveyor up and down, the pushing means comprises a pressing plate and a drive unit for reciprocally driving the pressing plate, the feeding means comprises a non-slip roller, and the accumulator. The rate means includes a vertical plate that stops the leading edge of the sheet that has been dropped in, a roller that is provided below the vertical plate that causes the leading edge of the sheet to drop, and an inclined plate that is provided below the roller. And a non-slip conveyor provided so as to incline so as to descend in the direction of the inclined plate with respect to the horizontal direction, and the second elevating means is configured to include a second lifter.

Further, according to the present invention, the second lifter descends as the sheet is accumulated in the accumulating means and stops at the lower limit, and rises when the sheets on the first lifter are exhausted. To configure.

Further, according to the present invention, a delivery conveyor for feeding the sheet delivered in an overlapped state to the next process is provided on the exit side of the non-slip belt constituting the accumulating means, and the conveyor is provided with One end facing the non-slip belt side is configured to be raised and lowered integrally with the accumulating means by the second lifter.

[0009]

FIG. 1 is a diagram showing an embodiment of the present invention.
This sheet feeding device includes a conveyor 11 that is moved up and down by a lifter 10, and at the lower limit position of this conveyor, a stacked sheet 13 that has been conveyed by a conveyor 12 (in this specification, a stacked sheet is a sheet. 14 shall be said to be in a stacked state)
Is sent. A sheet stopper 15 is provided on the left end side of the conveyor 11, and above the conveyor 11, an extrusion device for extruding a fixed amount of sheets 14 from the stacked sheets 13 on the conveyor 11 rising by the lifter 10 in blocks. 16 are provided. This extruder is
A pressing portion 17 that abuts against the rear end portion of the sheet 14 of one block and presses it, and a cylinder 18 that reciprocates the pressing portion in the horizontal direction indicated by arrow A. This cylinder 18
Can be a hydraulic cylinder or an air cylinder. It should be noted that the symbols (1) to (3) shown in the stacked sheet 13 indicate the division of the blocks of the sheet for convenience of description.

In the sheet feeding apparatus of this embodiment, the block of the sheet 14 extruded by the extruding apparatus 16 is placed on the block, moved horizontally, and dropped into the accumulator section 23 by a driving rubber roller 19 (rotated by a motor not shown). Driven) and a jogging portion 20 that aligns the rear end portions of the dropped seat 14. The jogging unit 20 is composed of a jogging plate 21 that strikes the rear end of the seat 14 and a drive unit 22 that rotates the jogging plate as indicated by arrow B. A jogging portion for aligning both sides of the seat 14 dropped into the accumulator portion 23 is also provided, but the illustration is omitted to simplify the drawing.

The accumulator portion 23 is provided in the pushing device 16
Also, a mechanism is provided for accumulating the blocks of the sheet 14 dropped by the driving rubber roller 19 and feeding the accumulated sheet 14 to the conveyor 24 in an overlapped state. That is, the accumulator unit 23 is movable in the horizontal direction according to the lengthwise dimension of the sheet 14 and the non-slip conveyor 25 that is inclined with respect to the horizontal direction (inclined so as to descend to the left in the figure). A vertical plate 26 and a roller 27 that is provided below the vertical plate and contacts the leading edge of the sheet 14 and drops the leading edge onto the non-slip conveyor 25.
And the sheet 14 that is provided between the roller and the non-slip conveyor 25 and is fed by the conveyor 25.
And an inclined plate 28 for making the overlapped state. The roller 27 and the inclined plate 28 are also the vertical plates
It is possible to move horizontally with 6 together.

The accumulator section 23 and the sheet 1 fed from the accumulator section in an overlapping state.
4 is moved up and down by a lifter 30 integrally with the roller 29 of the conveyor 24 that conveys the sheet 4 to the next step, for example, the printing machine. The other roller 31 of the conveyor 24 is assumed to be fixed without moving up and down.

The lifters 10 and 30 are moved up and down by hydraulic pressure or an air cylinder.

In the sheet feeding apparatus having the above construction, the ascent limit sensor PH1 for detecting the ascent limit of the conveyor 11, the ascent limit sensor PH2 for detecting the ascent limit, and the carry-in limit of the stacked sheets 13 on the conveyor 11 are detected. Carry-in limit sensor PH
3, the accumulator section lowering control sensor PH4 and the accumulator section raising control sensor PH5 are installed. Each sensor may be a limit switch, an optical detector, an electromagnetic detector, or the like as long as it can detect an accurate position. In this embodiment, an optical detector including a light projector and a light receiver is used.

Next, the operation of the sheet feeding apparatus having the above configuration will be described for the case of feeding a corrugated board sheet to the printing machine.

When there is no sheet 14 in the accumulator portion 23, the lifter 30 always rises to the upper limit and stands by, as shown in FIG. This standby position is set by shutting off the light of the rising control sensor PH5.

As shown in FIG. 2, the lifter 10 raises the conveyor 11 on which the stacked corrugated cardboard sheets 13 are placed,
The rising limit sensor PH1 blocks the light from the corrugated cardboard sheet 13
When the lifter 10 is detected, the lifter 10 is stopped and the cylinder 18 operates to drive the pressing portion 17 in the horizontal direction to push a predetermined amount of the corrugated cardboard sheet 14 onto the rubber roller 19. As described above, the rubber roller 19 is driven to rotate, and the block of the corrugated board sheet is conveyed toward the accumulator portion 23 and dropped into the accumulator portion 23. When the loading of the corrugated cardboard sheet blocks is completed, the cylinder 18 presses the pressing portion 1.
Return 7 to its original position. When the descending control sensor PH4 detects a corrugated cardboard sheet dropped due to light blocking, the lifter 30 starts descending, and when the sensor PH4 conducts light, it stops descending to prepare for the loading of the next corrugated cardboard sheet block and to lifter 10. Rises in preparation for the next sheet block extrusion operation. During this period, the block of the corrugated cardboard sheet dropped into the jogging unit 2 that aligns the rear end portions of the block with the front end portion of the sheet contacting the vertical plate 26.
0 and jogging is performed by the jogging unit that aligns both sides.

The corrugated cardboard sheets 14 stacked on the accumulator unit 23 are fed by the rollers 27, the inclined plate 28, and the non-slip conveyor 25 in an overlapped state, fed out onto the conveyor 24, and conveyed to the hopper of the printing machine. To be done. Since the amount of sheets supplied to the accumulator unit 23 is larger than the amount of sheets delivered from the accumulator unit 23, as the sheet blocks are sequentially dropped into the accumulator unit 23, the corrugated cardboard sheet 14 is placed in the accumulator unit 23. Accumulated. Therefore, the lifter 30 continues to descend,
As shown in FIG. 3, the lifter 30 stops at the lower limit. In this state, the feeding of the sheet 14 from the accumulator unit 23 and the supply of the sheet block to the accumulator unit 23 are continuously performed. During this period, the sheet block is supplied each time the amount of accumulated sheets decreases and the lowering control sensor PH4 is electrically conducted.

As shown in FIG. 4, when the stacked corrugated cardboard sheets 14 on the conveyor 11 are used up, the lifter 30 starts to move up and the lifter 10 moves down. The accumulator unit 23 moves upward and feeds the corrugated cardboard sheet 14 that has been accumulated into an overlapping state. At this time, the lifter 30 is controlled so that the lift control sensor PH5 raises when the light is conducted and stops when the light is shut off. When the lifter 10 returns to the lower limit position, the lower limit sensor PH2 detects this and stops the lifter 10. Then, the next stacked corrugated cardboard sheet 13 waiting on the conveyor 12 is fed to the conveyor 11. The stacked corrugated cardboard sheets 13 sent into the conveyor 11
When the carry-in limit sensor PH3 detects that the upper limit position has been reached, the drive of the conveyor 11 is stopped and the lifter 10 is raised. When the rising limit sensor PH1 shuts off the light, the pushing device 16 is driven, and the supply of the sheet block to the accumulator unit 23 is restarted. During this period, as described above, the corrugated board sheet 14 accumulated in the accumulator section 23 is being fed from the accumulator section 23 in an overlapped state, so that the corrugated board sheet supply to the hopper of the printing machine is not interrupted. Therefore, the corrugated board sheet can be continuously supplied to the printing machine, so that it is not necessary to reduce the printing speed of the printing machine as in the conventional sheet supply apparatus. This is the most important point of this invention.

The configuration and operation of one embodiment of the present invention has been described above, but this is merely an example, and it goes without saying that the present invention can be variously modified and changed.

For example, a cylinder 18 is used as the pushing device 16, but as shown in FIG. 5, the pressing portion 16 is fixed to a chain 33 stretched between two gears, and the chain is driven by a motor to push it out. You may make it operate | move.

Further, the jogging unit 20 is not a mechanism for rotating the jogging plate 21 but a jogging plate 21.
It is also possible to use a mechanism for horizontally reciprocating.

Further, the descending control sensor PH4 and the ascending control sensor PH5 of the accumulator section may be shared by one sensor. In this case, the function is switched between the ascending control and the descending control.

Further, it goes without saying that the sheet feeding apparatus of the present invention can be applied not only to feeding corrugated cardboard sheets to a printing machine, but also to continuously feed sheets to other processing steps.

[0025]

As described above, the sheet feeding apparatus of the present invention can feed sheets continuously without interruption, so that it does not affect the next step. For example, in the case where the next step is a printing machine for printing on a corrugated board sheet, the corrugated board sheet can be continuously supplied, so that high-speed printing can be supported and an extremely excellent effect is exhibited.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing supply of a sheet block to an accumulator unit.

FIG. 3 is a diagram showing a state in which an accumulator unit is at a lower limit.

FIG. 4 is a diagram showing a state where the sheets on the conveyor 11 are lost.

FIG. 5 is a diagram showing an example in which a chain is used as an extrusion device.

FIG. 6 is a diagram illustrating a conventional technique.

[Explanation of symbols]

 10, 30 Lifter 11, 12, 25 Conveyor 13 Stacked sheet 14 Sheet 15 Stopper 16 Extruder 17 Pressing part 18 Cylinder 19 Driving rubber roller 20 Jogging part 23 Accumulator part 25 Non-slip conveyor 26 Vertical plate 27 Roller 28 Sloping plate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B65H 3/04 B 9148-3F 320 Z 9148-3F 3/24 A 9148-3F 29/16 Z 9147 -3F 29/66 9147-3F

Claims (4)

[Claims] 1. A sheet feeding device for feeding stacked sheets in an overlapped state, wherein a first lifting means for lifting the stacked sheets and pushing the rising sheets from the upper sheet in block units. The pushing-out means for feeding out, the feeding means for feeding the block of sheets extruded from the pushing means, the block of sheets dropped by the feeding means are accumulated, and the accumulated sheets are overlapped. 2. A sheet feeding apparatus, comprising: an ascending / descending accumulating unit that is fed out by the above; and a second elevating / lowering unit that ascends and descends the accumulating unit. 2. The first elevating means comprises a conveyor and a first lifter for elevating the conveyor, and the extruding means comprises a pressing plate and a drive section for reciprocally driving the pressing plate. The feeding means includes a non-slip roller, and the accumulating means causes a vertical plate that stops the leading edge of the sheet that has been dropped and a leading edge of the sheet that is provided below the vertical plate to drop the leading edge of the sheet. Laura,
The roller is composed of an inclined plate provided below the roller, and a non-slip conveyor inclined with respect to the horizontal direction so as to descend toward the inclined plate, and the second elevating means is composed of a second lifter. The sheet feeding device according to claim 1, wherein 3. The second lifter descends as the sheet is accumulated in the accumulating means, stops at the lower limit, and rises when the sheets on the first lifter are exhausted. The sheet feeding device according to claim 2. 4. A conveyer conveyor is provided on the exit side of the non-slip belt constituting the accumulating means, for feeding the sheets delivered in an overlapped state to the next step, and the conveyor conveyer is opposed to the non-slip belt side of the conveyor. 4. The sheet feeding apparatus according to claim 3, wherein one end of the sheet feeding device is moved up and down integrally with the accumulating means by the second lifter.