JPH0812100A - Sheet supplying method and device - Google Patents

Abstract

PURPOSE:To lessen the blank refilling frequency per unit time by lessening the load of deposited blanks applied to the bottom blank irrespective of the quantity of the deposited blanks, and thereby avoiding erroneous separation of the bottom blank. CONSTITUTION:A sheet supply device comprises an elevating rod 23 to lift the whole deposited blanks B, pressing mechanisms 12, 12 to hold the specified part of those of the lifted blanks B which lie higher than the specified level over the bottom, and a controller which controls so that the remaining area of the blanks B other than the held part is supported on claws 4, 4 by sinking the rod 23 after making the pressing mechanisms 12, 12 hold the held part of the blanks B lifted by the elevating rod 23.

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 and a sheet feeding method used for separating and feeding one sheet at the bottom of a stacked sheet obtained by stacking a large number of sheets, and particularly to a sheet feeding method. The present invention relates to a measure for avoiding a bottom sheet separation error when there is a large amount.

[0002]

2. Description of the Related Art For example, in a line in which a packaging box for packaging articles is formed from a blank as a developed body thereof and at the same time articles are stored in the packaging box, it is necessary to supply the blanks one by one. There is. At that time,
A sheet feeding apparatus is used that supports a stacking blank in which a large number of blanks are stacked from below so that the blanks located at the bottom of the stack can be separated one by one in order. Blank As a conventional sheet feeding device of this type, generally,
It is known that a rectangular frame body having an opening through which the blank can pass in the up-down direction in a horizontal posture is provided with a plurality of claw members for supporting the deposition blank from below at a plurality of locations on the peripheral edge of the bottom thereof. A plurality of elevating rods each having a suction cup attached to each upper end thereof are arranged so as to be able to move up and down below the frame body. While adsorbing the bottom blank, the blanks are sequentially separated one by one by descending the rod.

That is, when the suction cup sucking the central portion of the blank of the bottom portion descends, the central portion of the blank bends downward and its peripheral edge extends horizontally between the second blank immediately above the blank and the claw member. Was pulled out by this,
Only the bottom blank will be separated from the deposition blank. Then, when the amount of the deposited blank gradually decreases and falls below a predetermined amount, a new blank is replenished and stacked on the deposited blank, and thus the supply of the blank is performed without interruption. Become.

[0004]

By the way, when the friction between the bottom blank and the second blank from the bottom is large, the second blank and the bottom blank are removed from the deposition blank together with the bottom blank. Separation can occur, such as separation, or the suction force can be defeated by the frictional force and the suction cup can be removed from the bottom blank without separating it.

However, in the above-mentioned conventional apparatus, since the entire load of the deposition blank is applied to the bottom blank,
When the amount of the deposited blank is large, a large load is applied to the bottom blank, so that the frictional force is increased, which easily causes a separation error. Therefore, in order to avoid this, it is not possible to support a large amount of deposition blanks at a time, and it is inevitable to support a relatively small amount of deposition blanks and frequently replenish a new blank. For this reason, there is a problem in that the number of blank replenishments per line operating time increases, which is troublesome.

The present invention has been made in view of the above problems, and an object thereof is to take out the sheets one by one from the bottom of the piled sheets such as the blanks described above and supply the sheets. Despite the large amount of the sheet, it is possible to avoid the mistaken separation of the bottom sheet from the accumulated sheet and to reduce the number of replenishment times of the sheet per predetermined time.

[0007]

In order to achieve the above object, according to the invention of claim 1, when the sheet at the bottom of the accumulated sheet supported by the claw member is taken out, the upper portion of the accumulated sheet having a predetermined height or more is removed. By lifting and holding the load so that the load of only the lower part of the accumulated sheet is applied to the sheet at the bottom of the accumulated sheet, the load applied to the sheet at the bottom is reduced even when the amount of the accumulated sheet is large. did.

That is, according to the present invention, a plurality of claws, each of which is arranged at the same height position and supports a stacking sheet formed by stacking a large number of sheets in a vertical posture in the vertical direction, from below at a plurality of positions on the periphery of the bottom thereof. It is premised on a sheet supply device which is provided with a member and sequentially takes out and supplies the sheets at the bottom of the accumulated sheet one by one.

Then, an elevating means for lifting a held portion having a predetermined height or more from the bottom of the accumulated sheet supported by the claw member, a holding means for holding the held portion of the accumulated sheet, When supplying the sheet at the bottom of the accumulated sheet, the held portion of the accumulated sheet is lifted by the elevating means and held by the holding means so that only the remaining portion of the accumulated sheet other than the held portion is supported by the claw member. And a control means for controlling.

According to a second aspect of the present invention, in the above-mentioned first aspect of the invention, the elevating means lifts the entire deposition sheet including the held portion. Then, the control means causes the holding means to hold the held portion of the accumulated sheet lifted by the elevating means, and then lowers the elevating means to move the remaining portion of the accumulated sheet other than the held portion. Is configured to be supported by the claw member.

According to a third aspect of the present invention, in the above-mentioned second aspect of the invention, the elevating means lifts the accumulated sheet by pushing up the accumulated sheet from below during the ascending operation.
Further, it is assumed that it has an adsorbing portion that comes into contact with a sheet at the bottom of the accumulated sheet from below to adsorb the sheet during the ascending operation, while separating the sheet from the accumulated sheet during the descending operation.

According to a fourth aspect of the present invention, in the above-mentioned third aspect of the invention, at the time of the lowering operation of the elevating means, the bottom sheet adsorbed by the adsorbing portion of the elevating means and the two sheets from the bottom located immediately above the sheet. Air injection means for injecting air between the eye sheet and the bottom sheet to promote separation of the bottom sheet from the accumulated sheet is provided.

In the invention of claim 5, the above-mentioned claim 1 or 2
In the invention, the holding means can press at least one pair of opposed side surfaces of the deposition sheet from the sides of the deposition sheet, and hold the held portion by pinching at least a portion having a predetermined height from the bottom of the deposition sheet. It comprises a plurality of pressing mechanism parts.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the pressing mechanism section includes a pressing member that can press the side surface of the deposition sheet, and a cylinder that moves the pressing member forward and backward in the pressing direction. Shall be done.

According to a seventh aspect of the present invention, in the above first to sixth aspects, the sheet is a developed body of a paper box.

According to the invention of claim 8, a plurality of sheets are vertically stacked in a horizontal posture by a plurality of claw members arranged at the same height position, respectively. As a sheet feeding method in which the sheets at the bottom of the accumulated sheet are sequentially taken out and fed one by one in a state of being supported from below, when the sheet at the bottom of the accumulated sheet is supplied, the entire accumulated sheet is lifted and lifted. After holding the held portion having a predetermined height or more from the bottom of the accumulated sheet, the rest of the accumulated sheet other than the held portion is lowered and only the remaining portion is supported by the claw member.

[0017]

With the above construction, according to the first aspect of the invention, the lifting means and the holding means are controlled when the sheets located at the bottom of the piled sheets supported from below by the plurality of claw members are sequentially taken out one by one. Controlled by means. In other words, the held portion having a predetermined height or more from the bottom of the deposited sheet is lifted by the elevating means and held by the holding means, and by these, the remaining portion of the deposited sheet lower than the held portion is the lower portion of the deposited sheet. Only the pawl member is supported. Therefore, in this state, the load of the held portion of the deposition sheet is not applied to the sheet at the bottom of the deposition sheet, and therefore the load of the deposition sheet actually applied to the bottom sheet is small even when the amount of the deposition sheet is large. Mis-separation of the bottom sheet is avoided. Therefore, the amount of the accumulated sheets can be increased without causing the bottom sheet separation error, and the number of sheet replenishments per predetermined time can be reduced.

According to the second aspect of the present invention, the elevating means is controlled by the control means so as to lift the entire deposition sheet. Then, after being lifted, the holding means is controlled by the control means so as to hold the held portion of the accumulated sheet. In this state, when the elevating means is controlled to be lowered by the control means, only the lower part of the accumulated sheet other than the held part is supported by the claw member. Therefore, the action of the invention of claim 1 is carried out specifically, and the amount of the accumulated sheet can be increased to reduce the number of times of replenishment.

Further, since the held portion is held at the lifted height position after the whole of the deposited sheet is lifted, on the contrary, after the held portion of the deposited sheet is held, As compared with the case where only the held portion is lifted as it is, the holding state of the held portion becomes stable because the lifting operation is not involved.

According to a third aspect of the invention, the deposited sheet is
The lifting operation of the lifting means pushes it up from below and lifts it. At the time of this ascending operation, at the same time, the sheet at the bottom of the accumulated sheet is adsorbed by the adsorbing portion of the elevating means. Then, the bottom sheet is separated from the accumulated sheet by the lowering operation of the elevating means. That is, the elevating means for lifting the accumulated sheet and the elevating means for separating the sheet from the bottom of the accumulated sheet can be used in common, and the apparatus structure can be simplified accordingly.

According to the fourth aspect of the present invention, during the lowering operation of the elevating means, between the bottom sheet adsorbed by the adsorbing part of the elevating means and the second sheet from the bottom located immediately above the sheet. Air is jetted by the air jetting means, which promotes separation of the bottom sheet from the accumulated sheet. Therefore, when the bottom sheet is separated, it is possible to avoid a situation in which the gap space between the bottom sheet and the second sheet from the bottom is in a negative pressure state and the separation of the bottom sheet is hindered.

According to the fifth aspect of the present invention, in the held portion of the accumulated sheet, at least one pair of opposed side surfaces of the accumulated sheet is pressed from the lateral side of the accumulated sheet by the plurality of pressing mechanism portions, and the sandwiched pressure is retained. Therefore, it is possible to avoid damaging the end portion of each sheet when holding the held portion.

According to the sixth aspect of the present invention, in each of the pressing mechanism portions, the pressing member is moved forward and backward in the pressing direction by the cylinder. Then, the accumulated sheet is clamped and held by pressing the side surface of the accumulated sheet by each pressing member. Therefore, the action of the invention of claim 5 is carried out specifically.

In the invention of claim 7, since the sheet is a developed body of a paper box, the actions of the inventions of claims 1 to 6 are specifically carried out.

In the eighth aspect of the invention, the entire deposition sheet is lifted from the position where it is supported by the claw member. Then, the held portion having a predetermined height or more is held from the bottom of the lifted accumulated sheet, and then the remaining portion of the accumulated sheet other than the held portion is lowered, and only the remaining portion is supported by the claw member. Therefore, the same effect as that of the invention of claim 2 is achieved.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. 2 to 4 show the entire configuration of an embodiment in which the present invention is applied to a sheet feeding device. This sheet feeding device forms a packaging box for packaging articles while at the same time storing the articles inside the box. A blank b, which is a developed body of the packaging box, is sequentially supplied to the line to be stored one by one, and a large number of blanks b punched into a predetermined shape are vertically stacked in a horizontal posture to deposit a blank B. Is basically configured by a supporting device 1 for supporting the above from below and a separating device 2 for separating and taking out the blanks b one by one from the bottom of the deposition blank B supported by the supporting device 1.

The supporting device 1 has a rectangular frame body 3 having long side portions 3a and short side portions 3b extending in the horizontal direction, and a blank b passes through the frame body 3 in a vertical posture in the vertical direction. A possible substantially rectangular opening is provided, and the deposition blank B is arranged above this opening. That is, on the lower surface of the frame body 3, a plurality of (here, 12) claw members 4, 4, which support the deposition blank B located above the opening of the frame body 3 from below at a plurality of locations on the periphery of the bottom portion thereof. …
Is provided. Further, on the upper side of the frame body 3, a plurality of pieces (8 in this case) for slidingly contacting the side surface portions of the deposition blank B supported by the claw members 4, 4, ... .) Are provided upright.

Each of the long side portions 3a, 3a of the frame 3 is provided with four claw members 4, 4, ... And each of the short side portions 3b, 3b is provided with two claw members 4, 4, respectively. They are arranged so as to face each other with the opening of the body 3 interposed therebetween. Then, each claw member 4 has an elongated hole 6 extending in a direction in which the claw member 4 extends in and out of the opening of the frame body 3.
and a flat metal fitting 6 having a, and the flat metal fitting 6 is inserted into the long hole 6a and screwed to the lower surface of the frame 3, and the flat metal fitting 6 is attached to the end of the frame 3
The bolt 7 is fixed to the frame 3 in a state of protruding to the opening. By loosening the bolt 7, the amount of protrusion of the flat metal fitting 6 into the opening of the frame 3 can be adjusted.

Three guide members 5, 5, ... Are provided on each long side portion 3a of the frame body 3, and one guide member 5 is provided on each short side portion 3b with the opening of the frame body 3 interposed therebetween. It is arranged to face each other. And each guide member 5
An L-shaped bracket 8 consisting of a horizontal portion attached to the upper surface of the frame body 3 and a vertical portion continuous at right angles to the horizontal portion, and a lower end portion attached to the vertical portion of the bracket 8 and extending vertically. 9 and.

Further, in the horizontal portion of the bracket 8 of the guide member 5 which is erected on the long side portion 3a, both sides in the width direction thereof are in contact with and separated from the opening of the frame body 3 (left and right direction in FIG. 2). Two long holes 8a extending in the longitudinal direction are provided, and the two bolts 10, 10 are inserted into the respective long holes 8a and screwed to the frame body 3, whereby the bracket 8, that is, the guide member 5 is fixed to the frame body 3. It is fixed to. On the other hand, in the horizontal portion of the bracket 8 of the guide member 5 on the short side portion 3b, one elongated hole 8a extending in the direction of separation and contact with the opening of the frame body 3 (vertical direction in FIG. 2) is provided at the center in the width direction. The two bolts 11 and 11 are provided with long holes 8 respectively.
The bracket 8 or the guide member 5 is fixed to the frame body 3 by being inserted through a at a distance and screwed to the frame body 3. That is, by loosening these bolts 10 and 11, each guide member 5 can guide the blank b according to its shape.

The vertical surface of the guide plate 9 on the side of the opening of the frame 3 constitutes a guide surface 5a slidably in contact with the side surface of the deposition blank B. Further, the upper end of the guide plate 9 is inclined so as to bend upward at a slight angle in a direction away from the opening of the frame body 3, and this makes it possible to easily supply the blank b to the supporting device 1. It is like this. Further, the lower end portion of the guide plate 9 penetrates the opening of the frame body 3 downward and extends to a position lower than the upper surface of the flat metal fitting 7 of the claw member 4, whereby each of the blanks b is claw member 4 ,. The guide plate 9 is surely guided to a position directly supported by 4, ....

The pair of opposed side surfaces of the deposition blank B can be pressed from the lateral sides of the deposition blank B to the guide members 5 on each long side portion 3a of the frame 3 and the deposition blank B of the deposition blank B can be pressed. Plural (six in this case) pressing mechanism portions for holding the held portion of the deposition blank B by pinching a portion having a predetermined height from the bottom (for example, a portion centered on a height position of 40 to 50 mm from the bottom surface). 12 are provided.
That is, these pressing mechanisms 12, 12, ... Compose the holding means of the present invention, and press the pressing member 13 that can press the side surface of the deposition blank B, and move the pressing member 13 back and forth in the pressing direction. And an air cylinder 14. A first air supply unit 15 is connected to each air cylinder 14 via each air hose, and each air cylinder 1 is operated by the operation of this air supply unit 15.
4 is supplied with air.

Specifically, the air cylinder 14 of the pressing mechanism portion 12 is fixed to the rear surface of the vertical portion of the bracket 8 of the guide member 5 with two bolts 16. Further, it has a piston rod 14a capable of moving forward and backward in the horizontal direction with respect to the deposition blank B above the opening of the frame body 3, and the pressing member 13 is attached to the tip of this piston rod 14a. The pressing member 13 includes a rectangular metal plate 13a and a rectangular rubber plate 13b that is attached to the front surface of the metal plate 13a and has the same size as the metal plate 13a. 8 and the rectangular through hole 8b provided in the overlapping portion of the guide plate 9,
It is accommodated in 9a so that it can move back and forth. The pressing surface 12 of the pressing mechanism portion 12 is formed by the front surface of the rubber plate 13b.
a is configured to hold the held portion by pinching the upper and lower intermediate positions of the deposition blank B by the frictional force between the pressing surface 12a and the side surface portion of the deposition blank B. , The blank b can be held without damaging the end thereof. Further, since the pressing amount can be made small (for example, about 5 mm) by using the frictional force, the deformation of the blank b which tends to occur when the pressing amount is large can be avoided.

Air nozzles 17 are provided on one side (right side in FIG. 2) of each guide member 5 on the upper surface of the short side portion 3b of the frame body 3 as an air ejecting means for injecting air obliquely downward. By injecting air from each air nozzle 17, when separating the blank b from the bottom of the deposition blank B, a gap between the blank b and the second blank b above the blank b is provided. It is designed to be enlarged by the blast air to promote the separation of the bottom blank b. A second air supply unit 18 is connected to each air nozzle 17 via an air hose, and when the air supply unit 18 operates, the injection air is pressure-fed to each air nozzle 17.

Further, on the upper surface of the frame body 3, there are provided remaining amount sensors 19a and 19b for detecting that the remaining amount of the deposition blank B has reached a predetermined value. The sensors 19a and 19b are mounted on the upper surface of the short side portion 3b on one side of the frame 3 (downward in FIG. 2) on the other side (left side in FIG. 2) of the guide member 5 via a bracket 20a. And a light emitting part which is attached to the other side (the left side in the same figure) of the guide member 5 on the upper surface of the other short side part 3b (the upper side in the same figure) via a bracket 20b and emits light toward the light receiving part 19a. 19b and the light emitting portion 19
When the light from b reaches the light receiving portion 19a, the state without the deposition blank B is determined, and when the light does not reach because it is blocked in the optical path, the state with the deposition blank B is determined. Then, when the remaining amount sensors 19a and 19b detect that the remaining amount of the accumulated blank B has reached a predetermined value, an instruction to supply a new blank b is issued.

On the other hand, the lower surface of the frame 3 is provided with passage sensors 21a and 21b for detecting that the bottom blank b has been separated from the deposition blank B and passed therethrough. The sensors 21a and 21b include a light receiving portion 21a mounted on the upper surface of one short side portion 3b of the frame 3 on the other side of the guide member 5 via a bracket 22a, and a guide member 5 on the upper surface of the other short side portion 3b. And a light emitting portion 21b which emits light toward the light receiving portion 21a.
When the light that should reach the light receiving portion 21a from 1b is blocked in the middle of the optical path, it is determined that the blank b has been separated and passed. Then, the determination signal of the light receiving unit 21a is input to the controller described later.

The separating device 2 includes a plurality (eight in this case) of elevating rods 23, 23, ... Which can be moved up and down toward the opening of the frame body 3, and these elevating rods 23, 23 ,.
An actuator 24 for synchronously driving up and down, and a suction cup 2 as a suction portion provided at the upper end of each lifting rod 23.
5 and. The elevating rods 23, 23, ... Compose the elevating means of the present invention, and when ascending, push up the deposition blank B from below to lift the entire deposition blank B by a predetermined dimension (for example, 10 mm). Each of the suction cups 25 is made of a flexible material such as rubber and sucks the bottom blank b by elastic deformation when the suction rod 25 is pressed against the bottom surface of the deposition blank B when the lifting rod 23 is raised. When the lifting rod 23 descends, the blank b is taken out from the deposition blank B while being suction-held.

Further, the plane positions of the elevating rods 23, 23, ... And the suction cups 25, 25, .. are arranged between the long side portions 3a, 3a of the frame body 3 of the supporting device 1 facing each other. A straight line connecting four and both short sides 3b, 3b
Are arranged at positions on a plane where the straight lines connecting the claw members 4 and 4 facing each other intersect each other.
The peripheral edge of the bottom blank b sandwiched between the claw members 4, 4, ... and the peripheral edge of the second blank b from the bottom when the bottom blank b adsorbs and descends. Are pulled out in a direction of separating from the claw members 4, 4, ... at the shortest distance. Also, although not shown, a pair of conveyor belts on both sides for receiving the blank b adsorbed by the suction cups 25, 25, ... It is arranged.

Then, as schematically shown in FIG. 5, a controller C as a control means is connected to the first air supply unit 15, the second air supply unit 18, and the actuator 24 so that a control signal can be input. ing. The controller C moves the lift rods 23, 23, ... By operating the actuator 24, and operates the first air supply unit 15 to expand and contract the air cylinder 14 of each pressing mechanism unit 12. Second air supply unit 18
Is operated to eject air from the air nozzle 17. Then, when the blank b at the bottom of the deposition blank B is supplied, in response to separation of the immediately preceding bottom blank b, the elevating rods 23, 23, ... After the held part of B is held by the pressing mechanism parts 12, 12, ..., The elevating rods 23, 23 ,. 4, ...
Is supported by.

Next, the operation will be described step by step with reference to FIG. 1, which schematically shows the overall construction of the paper feeding device.
First, in the initial state shown in FIG. 1A, all of the deposition blank B is supported by the claw members 4 and 4 in the supporting device 1, while the elevating rod 23 of the separating device 2 is located at the lower end. There is. Further, in each pressing mechanism portion 12 of the supporting device 1, the pressing member 13 is in the retracted position, and therefore, the pressing surface 1
2a is at a position deeper than the guide surface 5a of the guide member 5.

In this state, when the elevating rod 23 rises, the suction cup 25 is pressed against the bottom surface of the deposition blank B to adsorb the bottom blank b. And the lifting rod 23
Further rises and lifts the entire deposition blank B to a predetermined height shown in FIG. 7B, where the lifting rod 23 stops. After that, as shown in FIG.
2 and 12 operate to press each pressing surface 12a against the side surface of the deposition blank B. As a result, the held portion, which is the upper portion of the deposition blank B, is held by these pressing mechanism portions 12, 12. At this time, since the held portion of the deposition blank B is held at the position lifted by the elevating rod 23, the held portion of the deposition blank B is stabilized compared to the case where the deposition blank B is lifted after being held. Can be held.

Then, the elevating rod 23 descends, and as shown in FIG. 1D, the rest of the deposition blank B other than the held portion, that is, only the lower portion is supported by the claw members 4 and 4. Then, the elevating rod 23 further descends. Then, as shown in FIG. 1 (e), only the bottom blank b adsorbed by the suction cup 25 is separated from the other blanks b.
As shown in FIG. 1 (f), the separated blank b is moved to the lower position. At this time, the separated blank b
Is detected by the passage sensors 21a and 21b, the air cylinder 14 in each pressing mechanism portion 12 contracts and retracts the pressing member 13, so that the held portion falls due to its own weight and the accumulated blank B It overlaps with the lower part again. With the above, the operation of separating one blank b is completed, and thereafter, the same operation is repeated.

Therefore, according to this embodiment, since the load of the held portion of the deposition blank B is not applied to the bottom blank b, the load actually applied to the bottom blank b is large even when the amount of the deposition blank B is large. By making it small, it becomes possible to avoid a mistake in separating the bottom blank b. Therefore, it is possible to increase the amount of the accumulated blank B and reduce the number of blank replenishments during the operation of the supply line. Moreover, when the pressing mechanisms 12, 12, ... Hold the deposition blank B,
By holding the held portion by pinching the same height position from the bottom of the piled blank B, the amount of the lower portion supported by the claw members 4, 4, ... Is always substantially constant, and added to the bottom blank b. Since the load can be made substantially constant, the separation work can be stabilized.

Further, since the stacking blank B is lifted by utilizing the lifting motion of the lifting rods 23, 23, ... For separating the bottom blank b, a dedicated lifting means for lifting the stacking blank B is not required. Therefore, the device configuration can be simplified.

In the above embodiment, the suction cup 25 is pressed against the bottom blank b so as to adsorb the blank b. However, the bottom blank b is adsorbed by using an air suction type adsorption means. Good.

Further, in the above embodiment, only the portion of the deposition blank B having a predetermined height from the bottom is pressed by the pressing mechanism portions 12, 12 ,.
Although the held portion is held by being pinched with ..., For example, when the held portion has a small amount, the whole held portion may be held by being held.

In the above embodiment, the passage of the bottom blank b separated from the deposition blank B is detected by the passage sensor 21.
When it is detected by a or 21b, the holding state of the pressing mechanism portions 12, 12, ... With respect to the held portion is released, but when the lifting rod is moved up, strictly speaking, until the lifting rod reaches the rising end. It can be canceled during the period.

Further, in the above embodiment, the elevating means for lifting the deposition blank B and the elevating means for separating the bottom blank b are used in common, but two elevating means may be provided respectively. Good.

Further, in the above embodiment, the lifting operation of the deposition blank B is performed every time the bottom blank b is separated, but the holding operation is continued when it is not necessary to make the load applied to the bottom blank constant. Alternatively, the bottom blank may be sequentially separated, and the lifting operation and the new holding operation accompanying the lifting operation may be performed every plural times of separation.

Further, in the above embodiment, the deposition blank B
Although the held portion is held after the whole is lifted, the held portion may be held first, and then only the held portion may be lifted as it is.
In that case, the elevating means elevates and lowers the holding means.

[0051]

As described above, according to the first aspect of the present invention, a plurality of stacked sheets, each of which is arranged in a horizontal plane and is vertically stacked in a horizontal posture, has a plurality of stacked sheets at the bottom peripheral edge thereof. In a sheet supply device having a plurality of claw members supported from below at a position and sequentially feeding and extracting the sheets at the bottom of the accumulated sheet one by one, a predetermined height from the bottom of the accumulated sheets supported by the claw members. Elevating means for lifting the held portion above, holding means for holding the held portion of the accumulated sheet, and lifting the held portion of the accumulated sheet to the elevating means when feeding the sheet at the bottom of the accumulated sheet And holding means for holding, the control means for controlling so that only the remaining portion of the accumulated sheet other than the held portion is supported by the claw member. It is possible to reduce the actual load of the accumulated sheet applied to the stack and avoid the mistaken separation of the bottom sheet even when the accumulated amount of the accumulated sheet is large. The number of replenishments per hour can be reduced.

According to the second aspect of the present invention, the whole of the accumulated sheet is lifted up, and the held part of the lifted accumulated sheet is held by the holding means, and then the elevating means is operated to descend, whereby the accumulation is performed. Since the remaining portion of the sheet other than the held portion is supported by the claw member, the effect according to the invention of claim 1 can be specifically obtained, and the held state of the held portion can be obtained by the amount that does not involve the raising operation. Can be stable.

According to the third aspect of the present invention, the elevating means is configured to push up the accumulated sheet from below during the ascending operation to lift the accumulated sheet, and to abut the sheet at the bottom of the accumulated sheet during the ascending operation. Since the sheet is sucked and has a suction portion that separates the sheet from the accumulated sheet during the lowering operation, an elevating means for lifting the accumulated sheet and an elevating means for separating the sheet from the bottom of the accumulated sheet are provided. It can also be used in common, and the device configuration can be simplified accordingly.

According to the fourth aspect of the present invention, when the elevating means descends, the bottom sheet adsorbed by the adsorbing part of the elevating means and the second sheet from the bottom located directly above the sheet. Since the air injection unit for injecting air to promote the separation of the bottom sheet from the accumulated sheet is provided, when the bottom sheet is separated, the bottom sheet and the second sheet from the bottom are separated from each other. It is possible to prevent a mistake in separation due to the gap space between the two becoming negative pressure and hindering the separation of the bottom sheet.

According to the fifth aspect of the present invention, the holding means is capable of pressing at least one pair of opposed side surfaces of the deposition sheet from the sides of the deposition sheet, and at least a portion having a predetermined height from the bottom of the deposition sheet. Since it is made up of a plurality of pressing mechanism parts that hold the held part by pinching,
The held portion can be held without damaging the edges of each sheet.

According to the sixth aspect of the present invention, the pressing mechanism section includes a pressing member capable of pressing the side surface of the deposition sheet and a cylinder for moving the pressing member forward and backward in the pressing direction. Therefore, the effect according to the invention of claim 5 can be concretely obtained.

According to the invention of claim 7, since the above-mentioned sheet is a developed body of a paper box, the effects of the inventions of claims 1 to 6 can be concretely obtained.

According to the eighth aspect of the present invention, a plurality of stacked sheets are vertically stacked in a horizontal posture by a plurality of claw members arranged at the same height position. In a sheet feeding method in which the sheets at the bottom of the accumulated sheet are sequentially taken out one by one in a state of being supported from below at a position, when the sheet at the bottom of the accumulated sheet is supplied, first, the entire accumulated sheet is lifted,
Next, after holding the held portion having a predetermined height or more from the bottom of the lifted accumulated sheet, the rest of the accumulated sheet other than the held portion is lowered and only the remaining portion is supported by the claw member. The same effect as the invention of claim 2 can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the operation of a sheet feeding device according to an embodiment of the present invention in a stepwise and schematic manner.

FIG. 2 is a plan view showing a sheet feeding device.

FIG. 3 is a side view showing a sheet feeding device.

FIG. 4 is a front view showing a sheet feeding device.

FIG. 5 is a block diagram showing a control system of the sheet feeding device.

[Explanation of symbols]

 4 Claw Member 12 Pressing Mechanism (Holding Means) 13 Pressing Member 14 Air Cylinder (Cylinder) 17 Air Nozzle (Air Injecting Means) 23 Elevating Rod (Elevating Means) 25 Sucker (Suctioning) C Controller (Controlling Means) B Deposition Blank ( Deposition sheet) b Blank (sheet)

Claims (8)

[Claims] 1. A plurality of claw members, each of which is arranged at the same height position and supports a stacked sheet formed by stacking a large number of sheets in a vertical posture in a vertical direction from below at a plurality of positions on a peripheral edge of a bottom thereof, A sheet feeding device for sequentially picking up and feeding the sheets at the bottom of the piled sheets one by one, elevating means for lifting a held portion having a predetermined height or more from the bottom of the piled sheets supported by the claw members, Holding means for holding the held portion of the accumulated sheet, and when the sheet at the bottom of the accumulated sheet is supplied, the held portion of the accumulated sheet is lifted by the elevating means and held by the holding means, thereby A sheet feeding device, comprising: a control unit that controls so that only the remaining portion other than the held portion is supported by the claw member. 2. The sheet feeding apparatus according to claim 1, wherein the lifting / lowering means lifts the entire deposited sheet including the held portion, and the control means controls the lifting / lowering means to lift the deposited sheet. A sheet feeding device, characterized in that, by holding the held portion by the holding means and then lowering the elevating means, the rest of the accumulated sheet other than the held portion is supported by the claw member. . 3. The sheet feeding device according to claim 2, wherein the elevating means is configured to push up the accumulated sheet from below during the ascending operation to lift the accumulated sheet, and contact the sheet at the bottom of the accumulated sheet during the ascend operation. A sheet feeding apparatus comprising: a suction unit that comes into contact with the sheet and sucks the sheet while separating the sheet from the accumulated sheet when the sheet is lowered. 4. The sheet feeding apparatus according to claim 3, wherein the bottom sheet adsorbed by the adsorbing portion of the elevating means and the second sheet from the bottom located immediately above the sheet when the elevating means descends. A sheet feeding apparatus comprising: an air jetting unit that jets air between the sheet and the sheet to promote separation of the bottom sheet from the accumulated sheet. 5. The sheet feeding apparatus according to claim 1, wherein the holding means is capable of pressing at least one pair of opposed side surfaces of the accumulated sheet from the side of the accumulated sheet, and at least a predetermined amount from the bottom of the accumulated sheet. A sheet feeding apparatus comprising a plurality of pressing mechanism portions that hold a held portion by pinching a height portion. 6. The sheet feeding apparatus according to claim 5, wherein the pressing mechanism section includes a pressing member that can press the side surface of the deposition sheet and a cylinder that moves the pressing member forward and backward in the pressing direction. A sheet feeding device characterized by being a thing. 7. The sheet feeding apparatus according to claim 1, 2, 3, 4, 5 or 6, wherein the sheet is a developed body of a paper box. 8. A state in which a plurality of claw members arranged at the same height position support a stacked sheet in which a large number of sheets are vertically stacked in a horizontal posture from below at a plurality of locations on the bottom edge thereof. In the sheet feeding method, in which the sheets at the bottom of the accumulated sheet are sequentially taken out and supplied one by one, when the sheet at the bottom of the accumulated sheet is supplied, the entire accumulated sheet is lifted, and the bottom of the lifted accumulated sheet is A sheet feeding method, characterized in that after holding a held portion having a predetermined height or more, the remaining portion of the accumulated sheet other than the held portion is lowered and only the remaining portion is supported by the claw member.