JP2004299823A - Sheet feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet feeder capable of reliably carrying a sheet with high accuracy. <P>SOLUTION: A sheet carrying conveyor 1 to carry a sheet S<SB>0</SB>fed in from a hopper 10 by the action of a sheet take-out device 20 to a sheet working unit X is formed of a pair of sheet conveyors 2a and 2b with a sheet pressing member 4 to press the sheet fitted to an endless member 3. A pair of side guides 40 to guide side edges of the sheet S<SB>0</SB>are provided on a carrying passage of the sheet S<SB>0</SB>to be carried by the pair of sheet conveyors 2a and 2b, and a suction box 42 is provided on the inner side of each side guide 40. The sheet S<SB>0</SB>fed in from the hopper 10 is sucked and supported by the suction box 42, the sheet S<SB>0</SB>is immediately maintained in a stopped state, and the sheet S<SB>0</SB>is reliably press by a sheet pressing member 4 of the sheet conveyors 2a and 2b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet feeder that continuously takes out a large number of sheets stored in a hopper one by one and feeds the sheets to a downstream sheet processing unit.
[0002]
[Prior art]
FIG. 7 shows a blank sheet for a wrap round case (hereinafter, referred to as a sheet) in which a plurality of items to be packaged, such as cans and bottles, filled with beer, soft drinks, and the like are packed in a state of being arranged vertically and horizontally. Things are known. The sheet _{S 0} is a side panel _{P 1,} bottom panel _{P 2,} provided continuously in one direction through the eyes fold the side panel _{P 3} and top panel _{P 4,} the bottom panel _{P 2} and top panel _{P 4} the outer flap F ₁ continuously provided through the eyes Slight opposite edges, are consecutively provided the inner flap F ₂ via the eyes Slight both edges of the pair of side panels P _1, P _3. Further, a joint flap J is continuously provided on a side edge of _one side panel P1 via a fold line.
[0003]
Applicant wrap round cable support which is adapted sheet using a S ₀ automatically packaging packaged goods for the above has already proposed (JP 2002-308220).
[0004]
FIG. 8 shows stepwise a state in which the case is assembled by the wrap round caser described in the above publication. That is, in the lap round caser, the sheets S ₀ stored in the hopper 60 are continuously taken out one by one by a rotary sheet feeder, and the sheets S ₀ are provided downstream by a sheet conveying device. The sheet is fed into the bent part of the sheet.
[0005]
In the sheet bending section, the side panels P ₁ and P ₃ connected to both sides of the bottom panel P ₂ are bent while changing the transport direction of the sheet S ₀ downward by 180 °. That is, the sheet S and L-shaped side panels P ₃ provided continuously in the transport direction front side of the bottom panel P ₂ which direction is converted bent 90 ° folding, the supply of the L-shaped sheet S with a pair of pocket chain feed on the end, that when the bottom panel P ₂ of the sheet S is supported by the feed end, provided with side panels P ₁ provided continuously in the transport direction rear side of the bottom panel P ₂ in said pocket chain was has a sheet S ₀ and J-shaped bent upwardly 90 ° fold by the projections.
[0006]
Pair of pocket chain, holds the sheet S ₁ of the J-shaped from the front and back and conveyed to the downstream side (right side in FIG. 8) by the projection provided in each pocket chain, one J-shaped sheet S ₁ during its transport packaging subject article a from the side with push on the bottom panel P _2, and the other side of the pair of the inner flap F ₂ bend 90 ° folding the inward, respectively.
[0007]
When the bottom panel P ₂ on the packaging subject article A is supported, with one side of the pair of the inner flap F ₂ 90 ° bending in the direction, respectively, and bending inward the joint flaps J, top the panel P ₄ by bending to a position overlapping the upper surface of the packaging goods for a, are bonded to top panel P ₄ to the joint flap J through a pre-applied adhesive to the joint flap J. Further, by bending to a position overlapping the inner flap F ₂ each of the respective outer flap F _1, the inner flap F ₂ via the pre-applied adhesive to the inner flap F ₂ by bonding the outer flap F ₁ case K is assembled.
[0008]
[Problems to be solved by the invention]
Incidentally, in the been wrapped round cable described in the above publication, a sheet conveying device for feeding the sheet S ₀ taken from the hopper to the sheet folding section, the sheet S ₀ taken out from the hopper by a sheet feeder on the lower conveyor The sheet is fed to a fixed support table provided on the downstream side by contact with the lower conveyor, and the sheet is sent to the sheet bending section by the upper conveyor. Slip and flutter easily occur at the contact portion of the sheet and the contact portion between the sheet and the upper conveyor, and the sheet cannot be fed accurately due to the slip or flutter of the sheet. In particular, in the case of a warped sheet, the contact resistance to the lower conveyor and the upper conveyor is small, so that the sheet is likely to slip or flutter. The sliding and fluttering of the sheet appear remarkably when the sheet is conveyed at a high speed.
[0009]
Further, in the lap round caser, since there is no side guide for guiding the movement of both side edges of the sheet, the sheet may be inclined when the sheet is conveyed.
[0010]
Here, if the sheet slips or flaps or tilts, the timing of the supply of the sheet to the sheet bending portion is shifted, and the sheet cannot be bent accurately.
[0011]
A sheet conveyor that conveys a sheet includes a sheet conveyor in which a pressing piece is attached to an endless belt or an endless chain. Since the sheet conveyor with the pressing pieces presses the rear end of the sheet by the pressing pieces, it is extremely effective in preventing the sheet from slipping, and can surely convey the sheet.
[0012]
However, when a sheet conveyor with a pressing piece is employed, it is necessary to support the sheet taken out of the hopper with a sheet supporting plate and make the pressing piece abut the rear end of the sheet, and receive the sheet with the sheet supporting plate. In such a case, the sheet bounces due to the impact at the time of receiving the sheet, and when the sheet moves upward, there is a problem that the pressing piece intrudes below the sheet and feeds the sheet idly.
[0013]
Further, when the sheet feeding speed is increased, the pressing piece impacts against the rear end of the stopped sheet, and the sheet is pressed forward, and a gap is generated between the rear end of the sheet and the pressing piece. Sheets cannot be sent accurately.
[0014]
An object of the present invention is to provide a sheet feeding device capable of feeding a sheet taken out from a hopper to a sheet processing section such as a sheet bending section with high accuracy.
[0015]
[Means for Solving the Problems]
In order to solve the above-described problems, in the present invention, a sheet conveying apparatus that conveys a sheet toward a sheet processing unit provided on a downstream side, and a sheet ejection port faces a supply end of the sheet conveying apparatus. In a sheet feeding apparatus having a hopper for storing sheets and a sheet take-out device that takes out sheets stored in the hopper one by one from a sheet take-out port and feeds the sheet to a supply end of the sheet carrying device, the sheet carrying device includes: A pair of side guides that guide both side edges of a sheet to a sheet conveying path conveyed by the sheet conveyor, and a pair of side guides. A suction box for sucking and supporting a sheet taken out from the hopper between the feeding ends of the sheet conveyor; Provided was than it was adopted configuration.
[0016]
As described above, by providing the suction box in the sheet conveyance path, when the sheet is fed from the hopper to the supply end of the pair of sheet conveyors, the sheet is absorbed by the suction box, so that the sheet may not bounce. Instead, the sheet can be immediately held in a stopped state. Further, when the sheet has a warp, the warp of the sheet can be removed by suction by the suction box. Therefore, the sheet pressing member of the sheet conveyor can be reliably brought into contact with the rear end of the sheet, and the sheet can be reliably conveyed to the sheet processing section. Further, even if the sheet conveyor moves at a high speed and the sheet pressing member abuts against the sheet, the sheet is moved by the impact at the time of contact and a gap is formed between the sheet pressing member and the sheet pressing member. There is no inconvenience, and the sheet can be conveyed with high accuracy.
[0017]
Further, by providing a pair of side guides in the sheet conveyance path and guiding the side edges of the sheet by the pair of side guides, it is possible to prevent the sheet from being inclined or meandering.
[0018]
Here, the sheet conveyor has two rows, the respective carrier-side endless members are arranged in parallel and opposed to each other, and the gap between the opposed surfaces is wider than the width of the sheet. By pressing both sides of the rear end of the sheet, it is possible to more effectively prevent the sheet from being inclined.
[0019]
Further, by providing a suction box in the vicinity of a portion where the sheet pressing member of the sheet conveyor presses the sheet, in the case of a warped sheet, the suction of the suction box surely suppresses the warpage of the portion in contact with the sheet pressing member. Since the sheet can be removed, the warped sheet can be transported more reliably.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the sheet feeding device includes a sheet conveying device 1 for feeding a sheet S ₀ to a sheet processing section X, a hopper 10 provided on a supply end of the sheet conveying device 1, and a sheet take-out apparatus 20 which the sheet S ₀ accommodated in the hopper 10 to the feed end of the sheet feeder 1 feeds continuously one by one.
[0021]
Here, the sheet processing unit X sequentially sucks the sheet S ₀ sequentially conveyed to the discharge end of the sheet conveying device 1 by the suction head 50, and conveys the sheet S ₀ in the circumferential direction by rotation of the suction head 50 about the shaft 51. During the conveyance, the leading end of the sheet S _{0 in} the rotation direction is pushed down by the bar 53 passed between the pair of chains 52 to bend the sheet S ₀ into an L shape, and the L-shaped sheet S ₀ is divided into two rows. It is fed into the pocket between the projections 56 provided on each of the first pocket chain 54 and the double row of the second pocket chains 55, and is brought into contact with the projection 56 on the trailing side, so that the end of the sheet S _{0 on} the trailing side in the rotational direction of the sheet S _0. Is bent upward.
[0022]
The configuration of the sheet processing section X is the same as the sheet processing section (carton bending section) described in Japanese Patent Application Laid-Open No. 2002-308220, so that the details are omitted.
[0023]
As shown in FIG. 4, the hopper 10 includes a sheet take-out port 11 which is supported on the supply end of the sheet conveying device 1 and is inclined. The sheet S ₀ is stored in the hopper 10 in a stacked state. ing.
[0024]
Sheet taking the sheet S ₀ of the hopper 10 sequentially one by one fed to the feed end of the sheet conveying device 1 20, as shown in FIGS. 4 to 6, a pair of which are provided on the same axis core A gear case 22 is rotatably supported by each of the fixed shafts 21, a feeder arm 24 is fixed to an arm support shaft 23 rotatably supported by each gear case 22, and suction pads 25 are provided at both ends of the feeder arm 24. And a timing belt 28 is passed between a toothed pulley 26 stopped by the arm support shaft 23 and a toothed pulley 27 stopped by the fixed shaft 21, and is parallel to the fixed shaft 21. A drive shaft 30 is provided and is driven to rotate by a motor 29. The drive shaft 30 is fixed to the toothed pulley 31 and the side surface of the gear case 22. The configuration is such that the timing belt 33 is stretched between the fixed toothed pulleys 32.
[0025]
In the sheet take-out device 20 having the above configuration, the drive shaft 30 is rotated by driving the motor 29, and the rotation is transmitted to the gear case 22 via the toothed pulley 31, the timing belt 33, and the toothed pulley 32. 4 is rotated in the direction of the arrow in FIG. 4, and the teeth of the tension side belt 28 a of the timing belt 28 are attached to the teeth on the outer periphery of the toothed pulley 27 stopped by the fixed shaft 21 by the rotation of the gear case 22. Are sequentially meshed with each other to rotate the toothed pulley 26 and the arm support shaft 23 by 1.5 times the rotation angle of the gear case 22 in the direction opposite to the rotation direction of the gear case 22.
[0026]
That is, in the sheet take-out device 20, the arm support shaft 23 and the feeder arm 24 supported by the arm support shaft 23 are rotated in the direction opposite to the rotation direction of the gear case 22 while the gear case 22 makes one rotation in the direction of the arrow in FIG. When the suction pad 25 at the end of the feeder arm 24 comes into contact with the sheet S ₀ by 1.5 times, the suction pad S ₀ is applied with suction force to suck the sheet S ₀ , and the arm support shaft conveyed downward from the sheet outlet 11 of the hopper 10 is taken out of the sheet S ₀ by rotation of the feeder arm 24 which rotates with 23. Next, when the sheet S ₀ is conveyed above the supply end of the sheet conveying apparatus 1, the suction force of the suction pad 25 is released to drop the sheet S ₀ .
[0027]
As shown in FIGS. 3 and 4, the sheet conveying device 1 includes two sheet conveyors 2a and 2b. Sheet conveyor 2a, 2b has an endless member 3 consisting of an endless belt or endless chain, are mounted at equal intervals a plurality of sheet pressing members 4 for pressing the trailing edge of the sheet S ₀ to the endless member 3.
[0028]
The carrier-side endless members 3a of the two sheet conveyors 2a and 2b are arranged to face each other, and the interval between the facing surfaces is wider than the width of the sheet S. Its sheet conveyor 2a, a pair of side guides 40 for guiding the side edge of the sheet S ₀ is provided between opposed portions of 2b.
[0029]
The pair of side guides 40 is vertically divided, and a gap 41 is provided between the upper side guide 40a and the lower side guide 40b so that the sheet pressing members 4 of the sheet conveyors 2a and 2b can move. Upper side guide 40a is substantially equal length to the length of the sheet S _0, is adapted to guide the fall of the sheet S ₀ discharged from the sheet removal device 20. On the other hand, the lower side guide 40b has a length from the supply end to the discharge end of the sheet conveyors 2a and 2b.
[0030]
A pair of suction boxes 42 are provided between the pair of lower side guides 40b. A large number of suction holes 44 are formed in the entire upper plate 43 of the pair of suction boxes 42, and a suction force is applied to each suction hole 44 by applying a negative pressure to the inside of the suction box 42. The suction box 42 supports the sheet S ₀ that is discharged from the sheet take-out device 20 and falls by the upper plate 43, and reliably sucks the sheet S ₀ by the suction force acting on the suction hole 44.
[0031]
On the front side of the pair of the suction box 42, the sheet guide plate 45 for supporting the lower surface of the sheet S ₀ is provided to extend to the suction box 42. Sheet guide plate 45 is a front distal end extends long in the conveying direction of the sheet S ₀ is faces the discharge end of the sheet conveyor 2a, 2b, the upper surface is held on an upper surface flush with the suction boxes 42.
[0032]
As shown in FIG. 3, the upper side of the sheet guide plate 45 sheet presser plate 46 for preventing the floating of the sheet S ₀ is provided.
[0033]
Now, the gear case 22 is rotated in the direction of the arrow in FIG. 4 by driving the motor 29 shown in FIG. 5, and the arm support shaft 23 is rotated in the opposite direction to the rotation direction of the gear case 22. adsorption from the hopper 10 by adsorbing sheet S ₀ facing the sheet outlet 11 of the hopper 10 with the suction pads 25 of the sheet S ₀ is taken out, the sheet S ₀ and conveys the sheet S ₀ to the between the upper side guide 40a When releasing the sheet S ₀ is guided by a pair of upper side guide 40a drops onto the suction box 42 is supported by the top plate 43 of the suction box 42.
[0034]
At this time, since the suction force is imparted to the suction holes 44 of the suction box 42, the sheet S ₀ is immediately stopped state is attracted by the suction force applied to the suction holes 44, the sheet S in its stopped state ₀ trailing edge in the sheet conveyor 2a of, 2b sheet pressing member 4 abuts the while the sheet S ₀ by the movement of the sheet pressing member 4 is guided to the lower side guide 40b and the sheet guide plate 45, the sheet conveyor 2a, 2b Conveyed to the discharge end.
[0035]
Thus, a pair of sheet conveyor 2a is taken out from the hopper 10, by adsorbing supported by the suction box 42 the sheet S ₀ which is fed between the feed end of 2b, which hold the sheet S ₀ immediately stopped In addition, in the case of the warped sheet S ₀ , the suction of the suction box 42 can flatten the sheet S ₀ to remove the warp. Therefore, the sheet conveyor 2a, the sheet pressing member 4 of 2b it is possible to reliably press the trailing end of the sheet S _0, a gap is formed between the rear end and the sheet pressing member 4 of the sheet S ₀ no occurrence of inconvenience, can be reliably and accurately convey the sheet S ₀ to the sheet processing unit X.
[0036]
Although in the embodiment shown the rotary sheet taking device 20 as a sheet take-out apparatus for taking out continuously the sheet S ₀ of the hopper 10 one by one, the sheet take-out apparatus is not limited thereto. For example, it may be a swing type sheet take-out apparatus which is adapted to swing toward the suction pad for sucking the sheet S ₀ from below between the pair of the suction box 42 to the sheet outlet 11 of the hopper 10.
[0037]
The pair of sheet conveyor 2a, since to press the rear end sides of the sheet S ₀ by the sheet pressing member 4 of 2b, is possible to prevent the inclination from occurring to the sheet S ₀ at the time conveyance of the sheet S ₀ is possible, since the sheet pressing member 4 has a suction box 42 provided in the proximity portion to press the sheet S _0, when the sheet S ₀ with warping ensures the warping of sheet pressed portion by adsorption of the suction box 42 can be removed, the sheet S ₀ with warp can be reliably pressed conveyed by the sheet pressing member 4.
[0038]
In the embodiment, the sheet conveyor 2a in the respective opposite sides of the sheet conveying path is provided with the 2b, instead of this, the sheet conveyor provided below the sheet conveying path, which in that prevents the inclination of the sheet S ₀ A wide sheet pressing member may be attached. In this case, the sheet conveyor may be a single sheet conveyor.
[0039]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0040]
In the sheet feeder according to the first aspect, the sheet taken out of the hopper and fed to the supply end of the sheet conveyor is suction-supported by the suction box, so that the sheet can be immediately held in the stopped state. Further, the sheet can be reliably and accurately conveyed toward the downstream sheet processing section by the sheet pressing member of the sheet conveyor.
[0041]
In the sheet feeder according to the second aspect, the sheet pressing members provided on each of the two sheet conveyors press both sides of the rear end portion of the sheet. Can be prevented.
[0042]
In the sheet feeding device according to the third aspect, the suction box is provided in the vicinity of the portion where the sheet pressing member of the sheet conveyor presses the sheet. The warpage can be reliably removed by suction of the suction box, and the warped sheet can be reliably conveyed.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a sheet feeder according to the present invention; FIG. 2 is a plan view of FIG. 1; FIG. 3 is a front view showing an enlarged view of the sheet feeder shown in FIG. FIG. 5 is a plan view of FIG. 4; FIG. 6 is a vertical sectional front view of the gear case shown in FIG. 5; FIG. 7 is a plan view of a blank sheet of a wrap round case. A perspective view showing step by step the state of assembly of a case assembled by a conventional wrap round caser.
S ₀ sheet 1 sheet conveying device 2a, 2b sheet conveyor 3 endless member 4 sheet pressing member 10 hopper 11 sheet take-out port 20 sheet take-out device 40 side guide 42 suction box 45 sheet guide plate

Claims (3)

A sheet conveying device that conveys the sheet toward a sheet processing unit provided on the downstream side, a sheet storage hopper having a sheet outlet facing a supply end of the sheet conveyance device, and a sheet storage device that is stored in the hopper. A sheet feeder having a sheet take-out device for taking out sheets one by one from a sheet take-out port and feeding the sheet to a supply end of the sheet feeder, wherein the sheet feeder has a sheet pressing member for sheet pressing attached to an endless member. And a pair of side guides for guiding both side edges of the sheet to a sheet conveying path conveyed by the sheet conveyor, and a sheet taken out from the hopper to a supply end of the sheet conveyor between the pair of side guides. And a suction box for sucking and supporting the sheet. 2. The sheet feeder according to claim 1, wherein the sheet conveyor has two rows, the respective carrier-side endless members are arranged in parallel to face each other, and the gap between the facing faces is wider than the width of the sheet. The sheet feeding device according to claim 1, wherein the suction box is provided near a portion where the sheet pressing member of the sheet conveyor presses the sheet.

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