JP2015071479A - Paper feeding device and paper feeding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper feeding device and a paper feeding method capable of stably sending sheets piece by piece to a hopper of a paper feeding part of a printer and a punching machine.SOLUTION: A paper feeding device 1 includes: a paper feeding table 10 in which a plurality of pieces of sheets S are stacked in the vertical direction; sheet supply means 20 for sending one piece of sheet located at an uppermost part out of the plurality of pieces of sheets S in the horizontal direction; a pair of supply rolls 30 for biting a tip part of the sheet S sent from the sheet supply means 20 and sending the sheet S out; and a conveyor 40 for conveying the sheet S sent out of the supply rolls. The supply rolls 30 are variable speed rolls capable of accelerating/decelerating a supply roll peripheral speed while sending out one piece of sheet S from a tip end to a rear end.

Description

  The present invention relates to a sheet feeding device and a sheet feeding method, and more particularly, to an apparatus and a method for feeding sheets such as cardboard and paperboard to a sheet feeding unit of a printing machine or a punching machine.

  Some printing machines and punching machines have a hopper for temporarily holding a sheet in a sheet feeding unit for printing or punching. At the time of operation of the printing machine or the punching machine, in order not to run out of sheets held by the hopper, sheets are continuously fed to the hopper one by one, or generally in a batch state of about 20 sheets, It is necessary to send in.

FIG. 5 shows an example of a conventional paper feeding device that feeds a sheet to the hopper of the paper feeding unit of such a printing machine or punching machine. A sheet feeding device 101 shown in a schematic front view in FIG. 5A is provided adjacent to the sheet feeding unit 200 of the printing press. In FIG. 5, the description of the printer main body is omitted. The sheet feeding device 101 is provided with a sheet feeding table 110 on which a plurality of sheets S are stacked in the vertical direction and a plurality of sheets stacked on the sheet feeding table 110 at a time in the horizontal direction. A pusher 120 serving as a sheet supply unit to be fed to the sheet feeding unit, and a conveyance conveyor 140 that is provided adjacent to the sheet feeding table 110 and conveys a plurality of sheets fed by the pusher 120.
The sheet feeding device 101 pushes a plurality of sheets S stacked on the sheet feeding table 110 onto the transport conveyor 140 as a batch-shaped sheet Sb in which a plurality of sheets S are stacked.

  Above the transport conveyor 140, batch break rollers 151 and 152 of the batch breaker 150 are provided at a distance from the upper surface of the belt 141 of the transport conveyor 140. The batch breaking rollers 151 and 152 are shown in a plan view in FIG. Of the batch-like sheets S that move on the conveyer 140 by the rollers 151 and 152, the sheets S positioned below the batch are preceded on the conveyer 140 in such a manner that the sheets are partially separated from each other. The sheets S are overlapped, and the sheets S are continuously supplied one by one to the hopper 201 of the paper feeding unit 200 of the printing press.

  However, the conventional sheet feeding device 101 shown in FIG. 5 is stacked on the sheet feeding table 110 when the sheet S is pushed out as a batch-shaped sheet Sb from the sheet feeding table 110 to the transport conveyor 140 using the pusher 120. Depending on the state of the sheet S, the shape of the batch-shaped sheet Sb may be disturbed.

  More specifically, there are cases where the sheets S stacked on the paper feed tray 110 are not necessarily stacked horizontally, but are inclined and stacked or warped. When the sheet S stacked on the sheet feeding table 110 is warped, tilted, or the like, as shown in FIG. 5C or FIG. In addition, when the sheet S is pushed out by the pusher 120 due to the warp, the inclination, or the like, the sheet S is caught on the front plate 111 positioned on the front end side of the sheet S, which is erected on the sheet feeding table 110, or only on one side in the sheet width direction. Is pushed and twisted in the plane. As a result, the sheet S may be pushed out on the conveying conveyor 140 in an inclined state, and separation of each sheet may not be stably performed.

  FIG. 6 is an explanatory diagram of sheet feeding by a conventional sheet feeding device. FIG. 6 is a front view near the upper side of the sheet feeding table 110 (FIG. 6A) and a plan view of the sheet S at a position corresponding to FIG. This is shown in FIG. When the sheet S1 is caught on the front plate 111, the sheet S1 remains oblique with respect to the front plate 111 as shown in FIG. 6B, and the sheet S2 located on the sheet S1, The smooth progress of S3 is hindered, and the extruded sheets S2 and S3 are inclined.

  FIG. 7 is an explanatory view of another case of sheet feeding by the conventional sheet feeding device, in a front view near the upper side of the sheet feeding table 110 (FIG. 7A) and at a position corresponding to FIG. 7A. The plan view of the sheet S is shown in FIG. Shown in (a). When the sheet S <b> 1 is caught on the front plate 111, the tip of the lowermost sheet S <b> 1 that contacts the front plate 111 among the batch-shaped sheets Sb pushed onto the conveyor 140 is bent or torn. This becomes a problem when dropping the paper into the hopper 201 of the paper feeding unit 200 of the printing press.

  In the state shown in FIGS. 6 and 7, the sheet breaker rollers 151 and 152 provided on the transport conveyor 140 are used so that the sheets S are partially overlapped one by one from the lower one. When the sheets are separated and stacked by the hopper 201 of the sheet feeding unit 200, the horizontal alignment or overlapping amount of the continuous sheets S1, S2, S3, and S4 varies, and it is difficult to create a stable sheet flow state. For example, as shown in FIG. 8A by a partial front view in the vicinity of the conveyance conveyor of the conventional sheet feeding device, among the batch-shaped sheets Sb extruded onto the conveyance conveyor 140, the sheet S1 positioned at the lowermost position. , S2 is a case where the sheet S is supplied to the hopper 201 of the paper feeding unit 200 of the printing press in a state where the sheet S2 is inclined as shown in the plan view of the batch-shaped sheet Sb in FIG. . In this case, as shown in FIGS. 9A and 9B, a front view (FIG. 9A) and a plan view (FIG. 9B) in the vicinity of the hopper 201 of the paper feeding unit 200, the conveyance conveyor 140 When the sheet S is dropped on the hopper 201, the sheets S1 and S2 may be caught by the side guide 202 of the hopper 201 and may not fall into the hopper 201, and thus an operator needs assistance.

  Therefore, even when the stacked state of the sheets S stacked on the sheet feeding table 110 is curved or obliquely stacked at the uppermost position as shown in FIG. 5C or FIG. A sheet feeding device or sheet feeding device that can stably feed the sheets S one by one into the hopper 201 of the sheet feeding unit 200 of the printing machine without overlapping or bending on the conveyor 140 at a regular interval. A paper method is desired.

  Regarding a paper feeding method and a paper feeding device, Patent Document 1 discloses that a sheet roll is sucked one by one from the top of a paper pile, and a feeding roll and a paper pressing roll are provided via a plurality of blades arranged in parallel in front. A method and an apparatus are described in which a smooth operation is performed when supplying between the two.

Japanese Patent Laid-Open No. 11-106070

The paper feeding method and apparatus described in Patent Document 1 can smoothly supply a paper sheet between a feeding roll and a paper pressing roll, but the sheets are overlapped at a substantially constant interval on the conveyor. It does not describe the configuration to be performed.
In the present invention, even when the stacked state of the sheets stacked on the sheet feeding table is curved or obliquely stacked at the uppermost position, the sheets overlap on the conveyor at substantially regular intervals and are not bent or twisted. An object of the present invention is to provide a sheet feeding device and a sheet feeding method capable of stably feeding sheets one by one to a hopper of a sheet feeding unit of a printing machine or a punching machine.

  A sheet feeding device according to the present invention that solves the above-described problem is a sheet feeding table on which a plurality of sheets are stacked in the vertical direction, and one sheet positioned at the top of the plurality of sheets stacked on the sheet feeding table. A sheet supply means for feeding a sheet in a horizontal direction, and provided adjacent to the sheet feed table, including a leading end in the moving direction of the sheet fed by the sheet supply means, and in a direction away from the sheet feed table A pair of supply rolls for sending out the sheet, and a conveyor that is provided on the downstream side in the sheet moving direction of the supply roll and conveys the sheet sent out from the supply roll, and the supply roll is a single sheet It is a variable speed roll capable of accelerating / decelerating the peripheral speed of the supply roll while feeding from the front end to the rear end of the sheet.

  In the sheet feeding device of the present invention, the supply roll may be a variable speed roll that increases from the same peripheral speed as the sheet feeding speed by the sheet feeding unit and then decelerates to the sheet feeding speed. . Moreover, it is preferable that the sheet supply means is provided at the rear part of the sheet. Furthermore, the conveyor is preferably a variable speed conveyor that can adjust the conveying speed according to the length of the sheet.

  A sheet feeding method according to the present invention is a sheet feeding method for supplying one sheet stacked on a sheet feeding table to another apparatus using the sheet feeding apparatus, and a supply roll holds the sheet. The peripheral speed at the time is made to coincide with the feeding speed of the sheet by the sheet feeding means, and thereafter the feeding roll is increased in speed while the sheet is fed from the leading edge to the trailing edge of the sheet. Before the sheet is added, the peripheral speed of the supply roll is reduced until it matches the sheet feed speed of the sheet supply means.

  In the paper feeding method of the present invention, it is preferable that a plurality of the sheets are partially overlapped on the conveyor.

  According to the present invention, the sheet feeding means for feeding one sheet positioned at the top of the plurality of sheets stacked on the sheet feeding table in the horizontal direction is used to feed the sheets to the pair of supply rolls. The pair of supply rolls are variable speed rolls capable of accelerating / decelerating the peripheral speed of the supply roll while the pair of supply rolls are fed from the leading edge to the trailing edge of the sheet. Even when the stacked state is curved or obliquely stacked at the uppermost position, the sheets overlap one another on the conveyor and are not bent or twisted, and the sheets are fed one by one to the paper feed hopper of the printing press. , Can feed in stably.

It is a typical front view of the paper feeder of one embodiment of the present invention. It is explanatory drawing of the paper feeding method using the paper feeding apparatus of embodiment of this invention. It is a schematic diagram of another example of a sheet supply means. It is a schematic diagram of another example of a sheet supply means. It is explanatory drawing of the conventional paper feeder. It is an explanatory diagram of sheet feeding by a conventional sheet feeding device. It is explanatory drawing in the case of another sheet feeding by the conventional sheet feeder. It is a partial front view of the vicinity of the conveyance conveyor of the conventional paper feeder. It is explanatory drawing of the hopper vicinity of the paper feed part of a printing machine.

Hereinafter, embodiments of a sheet feeding device and a sheet feeding method according to the present invention will be specifically described with reference to the drawings.
A sheet feeding device 1 of the present embodiment shown in a schematic front view in FIG. 1 is provided adjacent to a sheet feeding unit 200 of a printing press. In FIG. 1, the description of the printer main body is omitted. The paper feeding unit 200 of the printing machine includes a hopper 201, and has a mechanism for feeding sheets stacked on the hopper 201, such as cardboard, one by one from the lowermost part. In the illustrated embodiment, the paper feeding device 1 is provided adjacent to the paper feeding unit 200 of the printing press, but instead of the paper feeding unit 200 of the printing press, adjacent to the paper feeding unit of the paperboard punching machine. May be provided.

  The sheet feeding device 1 includes a sheet feeding base 10 on which a plurality of sheets S are stacked in the vertical direction, and an uppermost one of the plurality of sheets S that are provided above the sheet feeding base 10 and stacked on the sheet feeding base 10. A sheet supply unit 20 that feeds a single sheet S positioned in the upper part in the horizontal direction and a leading end of the sheet S that is fed by the sheet supply unit 20 in the moving direction are included. A pair of supply rolls 30 that send out the sheet S in a direction away from the sheet feeding table 10, and a conveyance conveyor 40 that is provided on the downstream side of the supply roll 30 in the sheet moving direction and conveys the sheet sent out from the supply roll. I have.

  The sheet feed table 10 on which a plurality of sheets S are stacked in the vertical direction includes an elevating device 11. The lifting device 11 is configured such that the sheets S stacked on the sheet feeding table 10 are sequentially fed from the uppermost sheet S toward the conveying conveyor 40 by the sheet supply unit 20, thereby causing the sheets on the sheet feeding table 10 to be moved. Since the stacking height of S decreases, the apparatus is used to raise the sheet feeding base 10 by a predetermined amount so that the position of the uppermost sheet S with respect to the sheet supply means 20 maintains a predetermined height. is there. When the uppermost sheet S is completely transferred to the conveying belt 40 by the sheet supply means 20 and the supply roll 30, the elevating device 11 is raised by a predetermined amount. Thereby, the space | interval of the uppermost sheet | seat S of the sheet | seats S piled on the paper supply stand 10, and the suction cup 21a and the suction cup 21b as a structural member of the sheet supply means 20 mentioned below is kept constant.

  The sheet supply unit 20 feeds one sheet at a time from the uppermost part of the sheets S stacked on the sheet feeding table 10 toward the supply roll 30. In the present embodiment shown in FIG. 1, the sheet supply means 20 is provided in the vicinity of the rear end of the sheet S positioned at the top of the stacked sheets S, and a suction cup 21 a that adsorbs the sheet S; The suction cup 21a is provided separately from the suction cup 21a, and includes a suction cup 21b that sucks the sheet S and can move in the horizontal direction. The suction cups 21 a and 21 b are connected to the suction pump 22. An intake pipe 23 a is provided between the suction cup 21 a and the suction side of the suction pump 22, and an intake pipe 23 b is provided between the suction cup 21 b and the suction side of the suction pump 22. An exhaust pipe 24 a is provided between the suction cup 21 a and the exhaust side of the suction pump 22, and an exhaust pipe 24 b is provided between the suction cup 21 b and the exhaust side of the suction pump 22. A motor 25 is provided to generate a driving force that moves the suction cup 21b in the horizontal direction. The operation of the motor 25 is controlled by the control device 50. The suction cup 21a and the suction cup 21b can adsorb and detach the sheet S independently of each other.

  The sheet supply means 20 operates the suction pump 22 and sucks and lifts the vicinity of the rear end of the uppermost sheet S through the intake pipe 23a by the suction cup 21a, and the uppermost sheet by the suction cup 21b through the intake pipe 23b. The sheet S is sucked and held, and the sheet is fed by moving the sheet S toward the supply roll 30 together with the suction cup 21b by operating the motor 25. In order to open the sheet S adsorbed on the suction cups 21a and 21b, the sheet S is released by ejecting air from the suction cups 21a and 21b through the exhaust pipes 24a and 24b using the exhaust of the suction pump 22.

  The suction cup 21a of the sheet supply means 20 is preferably provided at the rear part when the sheet S is divided into a front part and a rear part according to the moving direction of the sheet. In the present embodiment shown in FIG. 1, the sheet S is provided near the rear end. This is because by providing the rear portion, it is possible to shorten the time required to feed one sheet S compared to the case where it is provided on the leading end side, and to increase the work efficiency.

  The supply roll 30 holds the sheet S and supplies it to the conveyor 40. The supply roll 30 is provided between the sheet supply unit 20 and the entrance side of the transport conveyor 40. The supply roll 30 has a pair of upper roll 30a and lower roll 30b positioned in the vertical direction, and a motor 31 that drives the lower roll 30b. The operation and rotation speed of the motor 31 are controlled by the control device 50. The supply roll 30 holds one sheet S between the upper roll 30 a and the lower roll 30 b and sends the sheet S to the transport conveyor 40 by the driving force of the motor 31. In order to improve the driving force for feeding the sheet S, the motor 31 can be configured to drive not only the lower roll 30b but also the upper roll 30a. Although the circumferential speed of the supply roll 30 will be described in detail later, when the leading edge of the sheet S is initially held by the upper roll 30a and the lower roll 30b, the speed of the sheet S is first substantially matched with the speed of the sheet S fed from the sheet supply means 20. Increase the speed to a predetermined speed.

  The conveyor 40 sends the sheet S to the paper feeding unit 200 hopper 201 of the printing press. An endless belt 41 that conveys the sheet S fed from the supply roll 30 is provided. The belt 41 includes a drive roll 42 provided on the entrance side of the transport conveyor 40, an exit side roll 43 provided on the exit side of the transport conveyor 40, and a belt for adjusting the belt tension to a constant tension. It is wound around the tension roll 44. The driving roll 42 receives the driving force from the motor 45 and circulates and moves the belt 41. The operation and rotation speed of the motor 45 are controlled by the control device 50. The conveyor speed of the conveyor 40 is set so that the plurality of sheets S overlap with each other on the belt 41 of the conveyor 40 by an appropriate overlap amount. The outlet side roll 43 is a driven roll that rotates together with the belt 41.

  The sheet S is placed on the upper surface of the belt 41 between the driving roll 42 and the outlet side roll 43, and is conveyed to the position of the outlet side roll 43 by the circulation movement of the belt 41 by the driving roll 42, and is fed by the printing press. To the hopper 201 of the unit 200. In the hopper 201, the position of the backstop 203 erected on the rear end side of the sheet S is adjusted according to the length L of the sheet S. Therefore, the outlet side roll 43 is movable as shown by the arrows in the figure so that the horizontal position of the outlet side roll 43 can be adjusted in correspondence with the position of the backstop 203. The belt tension roll 44 has a structure that moves up and down corresponding to the position where the outlet side roll 43 has moved. A guide roll 46 is provided in the movement path of the belt 41.

  The upper surface of the belt 41 of the transport conveyor 40 is lower than the upper end of the lower roll 30b of the supply roll 30, so that a plurality of sheets S can be easily overlapped on the belt 41.

  In order to make it easier for the sheet S to fall onto the upper surface of the belt 41 above the belt 41 and at the outlets of the pair of supply rolls 30, a blower 47 that blows air toward the sheet S and the belt 41 is installed. Has been. In addition, press rollers 48 are arranged in a plurality of rows on the upper side of the conveyor 40 so that the posture of the sheet S conveyed on the belt 41 is not disturbed.

A paper feeding method using the paper feeding device 1 of the present embodiment will be described.
The sheet feeding device 1 feeds the sheets S stacked on the sheet feeding table 10 one by one from the top using the sheet supply unit 20. On the other hand, on the conveyor 40, as shown in FIG. 1, the next sheet S2 is partially overlapped (wrapped) on the upper side of the sheet S1 previously fed to the conveyor 40. , And supplied to the paper feeder 200 of the printing press. The operation of the supply roll 30 is important in order to make the sheet S supplied and conveyed.
After the trailing edge of the sheet S1 previously supplied to the supply roll 30 passes through the upper roll 30a and the lower roll 30b, the leading edge of the next sheet S2 is fed into the upper roll 30a and the lower roll 30b of the supply roll 30. . Otherwise, the rear end of the sheet S1 and the front end of the sheet S2 may collide, and the sheets S1 and S2 may be clogged between the upper roll 30a and the lower roll 30b.

  One measure for avoiding the rear end of the sheet S1 and the front end of the sheet S2 from colliding is to adjust the feeding speed of the sheet S by the sheet supply means 20. However, adjusting the feeding speed of the sheet S of the sheet feeding unit 20 may increase the time required to feed one sheet S compared to the conventional technique. Therefore, from the viewpoint of the work efficiency of the sheet feeding device, the feeding speed of the sheet S of the sheet supply unit 20 is the same as the conventional one, and the sheet S is prevented from being jammed between the upper roll 30a and the lower roll 30b of the supply roll 30. It is desirable to do. Therefore, the supply roll 30 uses variable speeds for the peripheral speeds of the upper roll 30a and the lower roll 30b.

  The upper roll 30a and the lower roll 30b of the supply roll 30 have a predetermined interval without causing the rear end of the previous sheet S1 and the front end of the next sheet S2 to interfere with each other (clogged state) at this portion. Thus, it plays a role of reliably feeding the sheet S to the rear end of the sheet S one by one on the conveyor 40.

  As an example, the speed at which the sheet supply unit 20 feeds the sheet S is the same as the sheet moving speed at the stage of feeding the sheet S to the hopper 201 of the paper feeding unit 200 of the printing machine at the front end of the transport conveyor 40. The feeding speed of the sheet S of the sheet supply means 20 is smaller than the length L of the sheet S in terms of the advance amount per cycle in which the suction cup 21b sends the uppermost sheet S, and is approximately the sheet S. It is about 50% of the length L.

  When the peripheral speed of the upper roll 30a and the lower roll 30b that receives the sheet S1 from the sheet supply means 20 and holds the sheet S1 is the same as the speed at which the sheet supply means 20 feeds the sheet S, the previous sheet S1 Before the trailing edge passes, the leading edge of the next sheet S2 collides and becomes jammed. Accordingly, the peripheral speeds of the upper roll 30a and the lower roll 30b are made faster than the feeding speed of the sheet supply means 20. For example, the peripheral speed of the upper roll 30 a and the lower roll 30 b needs to be 200 to 300% or more of the feeding speed of the sheet supply unit 20. However, if the peripheral speeds of the upper roll 30a and the lower roll 30b are simply set to 200 to 300% or more of the feeding speed of the sheet supply means 20, both have a large relative speed, so the following problems occur. May occur.

  Considering the case where the sheet S is delivered from the sheet supply means 20 to the upper roll 30a and the lower roll 30b, the relative speed between the peripheral speed of the upper roll 30a and the lower roll 30b and the feeding speed of the sheet supply means 20 is large. Smooth delivery is difficult, and the sheet may be bent at this stage, the surface of the sheet may be rubbed due to a speed difference, or the surface of the sheet may be rubbed or peeled off.

  Therefore, in the sheet feeding device 1 of the present embodiment, the supply roll 30 is a variable speed roll, the peripheral speed of the upper roll 30a and the lower roll 30b of the supply roll 30, and the sheet supply unit 20 sends one sheet S. It is changed during one cycle to eliminate the above problems.

When the upper roll 30a and the lower roll 30b receive the sheet S1, the upper roll 30a and the lower roll 30b are made to coincide with the feeding speed of the sheet supply unit 20, and at the timing when the rear end of the sheet S1 is separated from the sheet supply unit 20 after receiving the sheet S1. The speed is increased, the rear end is passed before the next sheet S2 arrives, and the sheet speed is again reduced to the sheet speed sent from the sheet supply means 20 by the timing when the next sheet S2 arrives.
By adjusting the peripheral speed of the supply roll 30 as described above, the supply roll 30 holds the sheet S positioned at the top of the sheet feed table 10 one by one and sends it out onto the transport conveyor 40.

  On the transport conveyor 40, a state in which a plurality of sheets S are partially overlapped with each other by continuously superimposing the next sheet S2 delivered on the sheet S1 delivered earlier than the supply roll 30. create. Therefore, the moving speed of the belt 41 of the conveyor 40 is made lower than the speed of the sheet S sent out from the supply roll 30, that is, the peripheral speed of the upper roll 30a and the lower roll 30b (in this case, the average peripheral speed). The overlap between the sheet S1 sent out first and the sheet S2 sent out next is controlled by controlling the moving speed of the belt 41 of the conveyor 40 according to the size (length L) of the sheets S1 and S2. Adjusted appropriately.

  For example, the peripheral speed of the upper roll 30a and the lower roll 30b is the sheet feeding speed of the sheet feeding means 20, that is, the advance amount of the sheet S per cycle in which the suction cup 21b feeds the uppermost sheet S (this is referred to as the following) In terms of “sheet length Ls”, sheet length Ls = sheet length L + predetermined interval (approximately 50 mm).

By reducing the moving speed of the belt 41 of the conveyor 40 with respect to the peripheral speeds of the upper roll 30a and the lower roll 30b as the sheet advance amount per cycle, the sheet conveyor L is less than the sheet length Ls. The sheet S1 and the sheet S2 partially overlap each other on the sheet 40, and the sheet S2 and the sheet S3 partially overlap so that a plurality of sheets S are sequentially overlapped.
The moving speed of the belt 41 of the transport conveyor 40 can be arbitrarily changed according to other conditions, for example, depending on the state of the sheet S, specifically the size, thickness, weight, and the like.

  The sheets S are dropped one by one from the conveyor 40 to the hopper 201 of the paper feeding unit 200 of the printing press. At this time, if the sheet S is partially overlapped on the transport conveyor 40, the trailing end of the sheet S1 is held by the next sheet S2, so that the sheet S is stably dropped in a more horizontal posture.

  Regarding the paper feeding method by the paper feeding device 1 of the present embodiment described above, the operation of each member for creating a partial overlap between the previous sheet S1 and the next sheet S2 on the transport conveyor 40 is shown in FIG. This will be described with reference to (a) to (f).

The sheet supply means 20 in FIG. 2 is an apparatus that adsorbs the rear portion of the sheet S and transfers it to the supply roll 30 as in the conventional apparatus.
First, as shown in FIG. 2A, the suction cup 21 a of the sheet supply unit 20 is lowered with respect to the uppermost sheet S <b> 1 of the sheets S stacked on the sheet feeding table 10, and the operation of the suction pump 22 is performed. Thus, the suction cup 21a is brought to a negative pressure to adsorb the sheet S1, and then the suction cup 21a is raised to lift the sheet S1.

  Next, as shown in FIG. 2 (b), the suction cup 21b is made negative in the same manner as the suction cup 21a, and the lifted sheet S1 is held by the suction cup 21b, and then the exhaust of the suction pump 22 is used for the suction cup 21a. Then, the blown air is sent to remove the suction cup 21a from the sheet S1.

  As shown in FIG. 2C, the sheet S1 is moved forward (moved to the left in the drawing) while being held by the suction cup 21b, and is transferred between the upper roll 30a and the lower roll 30b of the supply roll 30. The distance between the lower end of the upper roll 30a and the upper end of the lower roll 30b is variable depending on the thickness of the sheet S1.

  As shown in FIG. 2D, after the sheet S1 arrives between the upper roll 30a and the lower roll 30b, the sheet S1 is held between the upper roll 30a and the lower roll 30b and sent out to the transport conveyor 40. The peripheral speeds of the upper roll 30a and the lower roll 30b are synchronized with the moving speed of the suction cup 21b when the sheet S1 is received. After the upper roll 30a and the lower roll 30b hold the sheet S1, the suction cup 21b releases the holding of the sheet S1 in the same manner as the suction cup 21a and moves backward to the standby position.

  As shown in FIG. 2E, the upper roll 30a and the lower roll 30b after the sheet S1 is added increase the peripheral speed, and feeding of the next sheet S2 to the paper feed roll 30 is started. Before, the sheet S1 is discharged to the conveyor 40. The speed of the conveyor 40, that is, the moving speed of the belt 41 is slower than the peripheral speed of the upper roll 30a and the lower roll 30b of the supply roll 30 so that the plurality of sheets S overlap each other according to the length L of the sheet S. Further, it is variable depending on the length L of the sheet S1.

  By repeating the operations from FIG. 2A to FIG. 2E, it is possible to create a state in which the next sheet S2 partially overlaps the upper side of the previous sheet S1, as shown in FIG. 2F. It becomes possible.

  The sheet supply means 20 shown in FIGS. 1 and 2 employs a system in which the rear portion of the sheet S stacked on the sheet feeding table 10 is sucked and fed to the upper roll 30a and the lower roll 30b of the supply roll 30. However, the supply apparatus of the present invention is not limited to the sheet supply means 20 shown in FIG. In general, sheet supply means for feeding one sheet at a time from the top of the stacked sheets S includes one that adsorbs the rear part of the sheet S as shown in FIG. Such sheet supply means may be used.

  FIG. 3 shows another example of the sheet supply unit. The sheet supply unit 20A shown in FIG. 3 is provided with a suction type conveyance belt 26 that circulates and moves while adsorbing the sheet S above the sheet S. Still another example of the sheet supply means is shown in FIG. The sheet supply means 20B shown in FIG. 4 is provided with a kicker 27 that presses the rear end of one sheet S. By combining these sheet supply means for feeding the sheets S one by one from the top of the stacked sheets S and the above-described supply roll 30 whose peripheral speed is variable, the supply shown in FIG. The same correspondence as that of the paper device 1 can be performed.

  The supply roll 30 of the present invention can correspond to the sheet supply means 20 shown in FIG. 1, the sheet supply means 20A shown in FIG. 3, the sheet supply means 20B shown in FIG. Any method can be used as long as it is a sheet supply unit capable of feeding sheets S one by one from the top of a plurality of stacked sheets.

  1, the motor 25 that moves the suction cup 21b of the sheet supply unit 20 in the horizontal direction, the motor 31 that drives the lower roll 30b of the supply roll 30, and the belt of the conveyer 40. Motors 45 for driving 41 are provided in the paper feeding unit 200 of the printing machine, respectively, so that the controller 50 proportionally follows the rotation speed of the motor 204 that drives a roll for feeding one sheet to the printing machine main body. It is controlled. However, when each motor of the sheet feeding device 1 is controlled by the control device 50, it is not essential to control based on the rotational speed of the drive motor 204.

  The peripheral speed of the lower roll 30 b of the supply roll 30 and the moving speed of the belt 41 of the conveyor 40 are variable depending on the length L of the sheet S. Therefore, the sheet feeding device 1 of the present embodiment is provided with a separate motor 31 and a motor 45, respectively, and the lower roll 30b and the belt 41 are driven independently. The lower roll 30b and the belt 41 are controlled by the control device 50 at the peripheral speed and the belt moving speed, respectively.

According to the sheet feeding device 1 of the present embodiment described above, the sheets S are continuously fed one by one from the uppermost part of the stacked sheets S onto the transport conveyor 40 by the supply rolls 30. Thus, a plurality of sheets S can be partially overlapped so that the sheet S can be supplied to the hopper 201 of the paper feeding unit 200 of the printing press in a stable state.
Since the sheet supply means supplies the sheets S one by one from the uppermost part of the stacked sheets S, even if the sheets S stacked on the supply table 10 are warped or inclined, the sheet S can be bent in a plane. The sheet S can be stably supplied to the transport conveyor 40 without causing twisting or bending.
By driving the supply roll 30 and the conveyor 40 with a servo motor, the overlap amount of the sheets S can be set by the sheet length L, the overlap amount of the sheets becomes substantially constant, and the sheet roll printing machine or the paper board punching machine supplies The dropping posture of the sheet S onto the hopper 201 of the paper unit 200 is stabilized.

S, S1, S2, S3, S4, Sb Sheet 1 Paper feeder 10 Paper feeder 11 Lifting device 20 Sheet supply means 21a, 21b Suction cup 22 Suction pumps 23a, 23b Intake piping 24a, 24b Exhaust piping 25 Motor 30 Supply roll 30a Upper roll 30b Lower roll 31 Motor 40 Conveyor 41 Belt 42 Drive roll 43 Exit side roll 44 Belt tension roll 45 Motor 46 Guide roll 47 Blower 48 Pressing roller 50 Control device 200 Feeder 201 of printing press Hopper 202 Side guide 203 Backs Top 204 motor

Claims (6)

A sheet feeding table on which a plurality of sheets are stacked vertically;
A sheet supply means for horizontally feeding one sheet positioned at the top of the plurality of sheets stacked on the sheet feeding table;
A pair of supply rolls provided adjacent to the sheet feeding table, holding a leading end in the moving direction of the sheet fed by the sheet feeding means, and feeding the sheet away from the sheet feeding table;
A conveyor that is provided on the downstream side of the supply roll in the sheet moving direction and conveys the sheet fed from the supply roll;
With
A sheet feeding device, wherein the supply roll is a variable speed roll capable of accelerating or decelerating the peripheral speed of the supply roll while the sheet is fed from the leading edge to the trailing edge of one sheet.   The sheet feeding device according to claim 1, wherein the supply roll is a variable speed roll that increases from the same peripheral speed as the sheet feeding speed by the sheet feeding unit and then decelerates to the sheet feeding speed.   The sheet feeding device according to claim 1, wherein the sheet supply unit is provided at a rear portion of the sheet.   The sheet feeding device according to any one of claims 1 to 3, wherein the conveyor is a variable speed conveyor capable of adjusting a conveyance speed according to the length of the sheet. A sheet feeding method using the sheet feeding device according to claim 1 to supply one sheet stacked on the sheet feeding table to another device,
The peripheral speed at which the supply roll holds the sheet is made to coincide with the sheet feed speed by the sheet supply means, and thereafter the peripheral speed of the supply roll is increased while the sheet is fed from the leading edge to the trailing edge of one sheet. A sheet feeding method characterized by increasing the speed and then decelerating the peripheral speed of the supply roll until it matches the sheet feed speed by the sheet supply means before the supply roll holds the next sheet.   The sheet feeding method according to claim 5, wherein a plurality of the sheets are partially overlapped on the conveyor.

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