JPS6112550A - Sheet feeding device - Google Patents

Abstract

PURPOSE:To prevent a thin sheet from damaging and jamming as well as to aim at accurate feeding of the sheet, by installing both high-speed and low-speed reverse handling belts parallelly in a sheet conveying device so as to make an opposite angle at the receiving side looking from the side direction larger in the low-speed belt side than the high-speed belt side. CONSTITUTION:When an original 8 reaches to a nearby spot of a handling plane intersecting point P part, a tip end of the original 8 piled up higher than the gap between a conveying surface 9a and a P part hits a reverse handling plane 30a of a high-speed reverse handling belt from the topmost one in order whereby its forward movement is checked, therefore the topmost original 8 and downward advance forward in consequence for that these originals, from the topper one, are fed into a sphenic gap between the handling plane 30a and the conveying surface 9a as being dislocated along the handling plane 30a in order. And, first stage handling is large is pressing component force against the original 8 because an opposite angle between the handling plane 30a and a conveyor belt 9 is small, whereby the original is in no case turned up and undue handling action is kept back owing to low friction, thus proper adjustment takes palce. Next, piled originals less than the P gap are fed into the sphenic gap, and finally they are fed in a single sheet pincers sticking state by means of a highly frictional reverse handling plane 31a.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a sheet feeding device that sorts laminated sheets using a reverse sorting method and feeds them one by one from the front side, and is capable of automatically sequentially feeding a large number of original sheets in a copying machine or the like. It is used for feeding.

The conventional technology, the reverse sorting method, acts in the reverse direction on the laminated sheets on the conveying means, and forcibly holds down all but one sheet that comes into contact with the conveying means and is strongly fed. ◎ and ζ have excellent anti-feeding functions, but in the case of originals, some of them are quite thin, and if the leading edge of the document curls slightly toward the handling member, the reverse handling action will cause the leading edge to curl up and be damaged. This may cause a jam.

Conventionally, a sheet feeding device as shown in FIG. 16 is known from Japanese Patent Publication No. 58-48453 as a device devised to eliminate such inconveniences. In this device, a presser bell (with a relatively small coefficient of friction) E is mounted on the circumferential surface of the main transport roller A, and is driven to rotate in the opposite direction to the main transport roller A. The reversing handling belt 0, which has a relatively large coefficient of friction, is pressed against the main transport roller A so that the contact angle at the contact portion of the belt with the main transport roller is larger on the reversing handling belt 0 side than on the presser belt B. I'm forced to.

Problems to be Solved by the Invention In the case of the conventional apparatus described above, as is clear from FIG. Before contacting the main conveyance roller A, the presser belt B, which is driven by the main conveyance roller A, is pressed down in the conveying direction. The top is well protected from scratches. However, the presser foot bell)
Since B is driven by the main conveyance roller A and is in pressure contact with the main conveyance roller A while running in the same sheet conveyance direction, it is easy to insert a group of 1 m of sheets between it and the main conveyance roller A. Since the resulting clamping of the tip of the seam hm is relatively strong, the clamping force sometimes approaches or exceeds the reverse feeding effect of the reverse handling belt 0, resulting in poor handling performance.

Means for Solving the Problems In this invention, in order to solve the above-mentioned problems, 1 a low-friction high-speed reversal handling belt and a high-friction low-speed reversal handling belt are provided on the sides facing and facing the sheet conveyance means. The respective handling surfaces are arranged so as to intersect with each other when viewed from the side, with the facing angle of the sheet receiving side being larger on the low speed reverse handling belt side than on the high speed reverse handling belt side. Further, the conveying means is opposed to the low-speed reversal handling belt in a single sheet pinching state at a position closer to the sheet feeding direction side than the above-mentioned handling surface abutment point of each handling belt.

The juxtaposition of the high-speed reverse handling belt and the low-speed reverse handling belt in the above relationship can be achieved, for example, by placing a high-speed reverse handling belt on the former of a large-diameter drive roller and a small-diameter drive roller that are integrally rotated on the same shaft. In addition, a low-speed reversal handling belt is applied to the former, and the low-speed reversal handling belt is applied to the former of a large-diameter driven idling roller and a small-diameter driven idling roller that can be rotated independently on the same shaft. Hanging the sorting belts can be easily done by passing them, but the present invention is not limited to this, and the present invention is not limited to this, but the present invention is not limited to this, and each sorting belt can be stretched between each drive roller on a different axis and each driven roller on a different axis. It is also possible to adopt other types of membranes, such as, but in this case, the driving rollers and driven rollers do not need to have different diameters from each other.

Each sorting belt 1, for example, a low-speed reversing sorting belt and a high-speed reversing sorting belt are arranged alternately at intervals, and the sheet conveying means is inserted slightly between the respective sorting belts so that the sheet conveying means is not attached to a predetermined portion of the low-speed reversing sorting belt. The sheet conveying means may be opposed to each other in contact with each other, or may be opposed to a predetermined portion of each low-speed reversible sorting belt in a state of direct contact. The sheet conveying means may be a belt or a roller, but in the case of a low-speed reversible sorting belt, the closest portion or contact portion to the low-speed reversing belt is the opposite portion.

Function: Due to the above structure, the N sheet conveying means conveys the laminated sheet in contact with it in a predetermined direction.
On the side opposite to the sheet conveying direction from the sorting and cutting intersection point of each sorting belt, the low-friction sorting surface of the high-speed reversing sorting belt, which faces the sheet conveying means closer to the sheet conveying means at a smaller opposing angle than the low-speed reversing sorting belt, is first applied. The pressing against the sheet conveyance means side due to the small opposing angle allows the reverse handling action, which has a large component force, to be received moderately with low friction and with high speed contact, and the sheet conveyance means and the high speed reverse handling belt are The advance of the sheet on the side of the sorting belt relative to the sheet on the sheet conveyance means is suppressed so that the tip of the high-speed reverse sorting belt is displaced along the sorting surface of the high-speed reverse sorting belt due to the force that enters the wedge-shaped gap between the sheets.

Among the laminated sheets that have undergone the first stage of handling by this high-speed reversing and reversing belt, several sheets on the side of the sheet conveying means are separated, and a single sheet falls between the sheet conveying means and the low-speed reversing and reversing belt after crossing the crossing point. The paper enters the facing section, and some of the sheets undergo the second stage of reverse handling by the low-speed reverse handling belt.
It is effective due to high friction, and the number of sheets to be separated is small, so that it is received easily and reliably, and only the one sheet that is in contact with the sheet conveying means is fed from between the sheet conveying means and each sorting belt, and is fed in a predetermined direction. sent.

The high-speed reversing sorting belt is connected to the low-speed reversing sorting belt RTC@ even on the sheet conveying direction side from the sorting and cutting intersection point.
As with the first stage of reverse handling, pressing against the sheet conveying means exerts a large reverse handling action on the sheet being conveyed while being subjected to the second stage of reverse handling.
Continue to play.

Embodiment The embodiment shown in FIGS. 1 to 7 will be described. In the case where the automatic document feeder 2 installed on the copying machine 1 is provided as a sheet loading section 3 for automatically feeding sheet documents. It is shown.

An automatic document feeder 2 connects the sheet feeder 3 to a copying machine l.
A conveyance system that automatically conveys a sheet document fed from a one-sheet feeding section 3 installed at one end of the top to a predetermined position on the document placement glass 4 on the top surface of the copying machine 1, and temporarily stops it when necessary. The stopping unit 5 and the temporarily stopped sheet document fed from the transport stopping unit 5 are reversed as necessary and returned to a predetermined position on the document placement glass 4 in cooperation with the transport stopping unit 5. It has a reversing/returning/discharging section 6 for direct discharge without reversing.

The sheet feeding section 3 receives the stacked sheet document 8 on the document stacking tray 7 mounted so as to extend toward the negative side onto the sheet conveyance belt 9, and feeds it to the conveyance stop section 5. A reverse sorting means 10 is provided on the conveying belt 9 at its end in the conveying direction a, and applies a reverse sorting action to the laminated sheet original 8 about to be fed to the conveying stop section 5, and the conveying belt 9 The conveyance stop section 5 receives the sheet document 8 sent from the sheet feed section 3 into the receiving path, and sends it to the stopper 11. After stopping once and adjusting the tip position and timing,
Feed the document onto the document placement glass 4, exposure position stopper 1
At the predetermined exposure position regulated by 2, the exposure is stopped for the necessary exposure time according to the number of copies, and after the exposure is completed, the unit is turned over and returned to the ejecting section 6.
Send to. In order to convey these sheet originals 8 in a timely manner, a conveyance roller 13 e 14 , a conveyance belt 15 , and a conveyance roller 16 are provided.

The reversing return/ejecting section 6 has a receiving path 18 for ejecting the loaded sheet original 8 onto the original ejecting tray 17 as it is, and a receiving path 18 for ejecting the sheet original 8 onto the ejecting path 18 by switching the path switching guide 19. It has a reversing return path 20 for reversing and returning to the conveyance stop section 5. 21 is a conveyance roller 22 in the ejection path 18 is a conveyance roller in the reversal return path 20. The conveyance stop section 5 exposes the sheet original 8 returned from the reversal return/discharge section 6 to a predetermined exposure. Return to position,
The sheet feeding structure of the sheet feeding section 3, which also has the function of inverting and returning the sheet after exposure and feeding it to the discharge section 6, will be described in more detail as shown in FIGS. 1, 4, and 5. As if
The sheet conveying belt 9 is connected to a drive roller 24 on a drive shaft 23.
and the driven roller 26 on the driven shaft 25,
The zero reversal sorting means 1O, which are arranged in parallel across the width of the sheet conveyance path at appropriate intervals, is hung on the former of the large-diameter drive roller 28 and the small-diameter drive roller 29 that are rotated together on the drive shaft 27. A low-friction high-speed reverse handling belt 30,
A high-friction, low-speed reverse handling belt 31, which is hung on the latter, is arranged in parallel across the width of the sheet conveyance path, with a distance between them such that each of the sheet conveyance belts 9 can be inserted one by one. ing. The high-speed reverse handling belt 30 is connected to the driven shaft 3
The loop is passed to a small-diameter driven roller 33 that can rotate independently on
The hook is passed to a large-diameter driven roller 34 that can rotate independently on the roller 2.

As a result of the above-mentioned passing, the high-speed reversing handling belt 30 side from the same drive shaft 27 passes through the large diameter drive roller 28 at high speed, and the low-speed reversing handling belt 31 side moves at high speed through the large diameter drive roller 28. at low speed via a small diameter drive roller 29,
The driven rollers 33,
34 can be rotated independently, so both bells) 30.31
absorb the speed difference. Also, each handling bell) 30.31 is,
An intersection of the sorting surfaces 301.31a is formed between them when viewed from the side, and the low speed reverse sorting belt 31 is lower than the high speed reverse sorting belt 30 with respect to the end of the sheet conveying belt 9 on the conveying direction a side. They face each other with a large opposing angle.

The sheet conveyance belt 9 has a sheet conveyance belt 9, at a portion opposite to the above-mentioned sorting bells) 30.31, between each sorting bell) 30.31, and a sheet conveyor belt 9 that is closer to the point P of the sorting surface on the side opposite to the sheet conveyor belt 9. It enters a little at a position closer to the direction a, and the conveying surface 9IL of the sheet conveying belt 9 and the handling surface 31& of the low-speed reverse handling belt 31 move toward the sheet conveying direction a side with respect to the handling surface intersection point P. In the offset position, a single sheet is faced in a clamped state with a cross point Q seen from the side.

Here, the sheet conveyance belt 9 is made of a rubber-based plateau material, and is horizontally arranged so that the driving shaft 23 and the driven shaft 25 are lined up on a horizontal plane.
is made of a foamed synthetic resin material, and the driving shaft 27 and the driven shaft 32 are arranged at an angle so that they are lined up on an inclined plane inclined by about 15' with respect to the horizontal plane. Furthermore, the l[rub] of the low-speed reversal handling belt 31 is greater than that of the high-speed reversal handling belt 30. As a result, the magnitude relationship of the friction between the pulling sheet conveyance belt 9 and each sorting bell 30, 31 is as follows: friction of belt 29>friction of belt 31>friction of belt 30.

Further, the reversal speed of each sorting belt 30, 31 is set to be less than or equal to the conveying speed of the sheet conveying belt 9. On the other hand, the reversal speed ratio between each handling bell) 30.31 is the driving reeler 28,
29, each corresponding to a ratio of diameters 2818 and 221 m. In addition, the driven rollers 33 of each sorting belt 30+31,
The diameter of 34 is 20m - 24 audiences.

As shown in FIGS. 6 and 7, the document loading tray 7 has an upwardly directed guide wall 35 formed on the negative side edge, and from this guide wall 35 to the bottom at a dimensional position suitable for each document size.
A guide groove 361 t36B t...3611 is formed, and when the sheet original 8 placed on the tray 7 has one side edge abutted against the guide wall 35, the other side edge is formed in the guide groove 361.
. . , 36S hangs down in a groove 363 according to its size, as shown in FIG. 7, and is guided by the groove side wall 36s-1 of the hanging groove 363 and the guide wall 35.

The stacked sheet originals 8 on the original stacking tray 7 are slid into the sheet feeding section 3 and placed on the sheet conveying belt 9 while being guided by the guide wall 35 and the groove side wall 36fi-1. The laminated sheet original 8 placed on the belt 9 is fed to the handling surface protrusion point P while passing through a skew prevention plate 37 and a turn-up prevention plate 38. When the document 8 reaches near the P section, the leading edge of the document 8 stacked on the conveyance surface 9a of the sheet conveyance belt 9 and the sheet document 8 stacked above the gap between the P sections is stacked in order from the highest one according to the stacking height. As shown in Figure 2, a low-friction, high-speed reversing belt 30
As a result of the progress of the uppermost original 8 and the lowermost original 8 whose advancement is suppressed, the original 8 comes in contact with the reverse handling surface 30 &
The sheets are fed into the wedge-shaped gap between the reverse handling surface 30a and the conveying surface 9& while shifting their positions along the reverse handling surface 30&, that is, being handled, starting from the top end.

The first stage of handling by the reverse handling surface 30& is caused by the small opposing angle of the handling surface 30a to the conveyor belt 9, which causes a large component of force to press the leading edge of the document 8 toward the conveyor belt 9. Together with the action just before the prevention plate 3B, the leading edge of the original 8 is prevented from being turned up. Since the reversing handling surface 30a has low friction, it is possible to prevent the facing angle from exerting an excessive handling action on the document 8 due to its small size, and the high reversing speed and low friction prevent the reversing from occurring. The separating force is appropriately adjusted according to the facing angle of the front handle.

The several sheet originals 8 stacked on the transport surface 9a and below the gap between the P section are fed into the narrower wedge-shaped gap beyond the P section toward the opposite section in a single sheet clamped state. , and from the tip of the uppermost one, this time, the high-friction, low-speed reversing belt 31, which is in contact with the first
They will be dealt with in the same way as the stages.

This second-stage reverse sorting action is performed on a small number of sheet originals 8 by the high-friction reverse sorting surface 31a, and finally in a state where a single sheet is caught between the sheet conveyance belt 9. Therefore, only one sheet document 8 that is in contact with the conveying surface 9&, which has even greater friction, overcomes the reverse feeding action of the reverse handling surface 31a and is fed forward by δ. In the second-stage reverse-handling operation section, the leading edge of the document 8 is turned over in the extremely small wedge-shaped gap, making it difficult to lift up. 1 continues to act on the leading edge of the sheet original 8 undergoing the second stage of reverse handling, thereby preventing the leading end of the original 8 from turning up due to the second stage of reverse handling.

The sheet conveying belt 9 enters between each of the handling belts 30131 and 30131 between the sheet conveying belt 9 and the high-speed reverse handling belt 3.
0 at the second stage reverse sorting section, so that the belt 30 can easily exert the curling prevention effect on the sheet document 8 which is subjected to the second stage reverse sorting action. However, this effect of preventing curling can be obtained to some extent by reducing the difference in opposing angles of each sorting belt 30°310 to the sheet conveying belt 9, even when the above-mentioned intrusion is close to 0 or even 0. Belt in section 30
Even if there is no function to prevent curling, curling can be prevented by adjusting the facing angle of the high-friction low-speed reverse handling belt 31 with the sheet conveying belt 9, the low speed of reverse rotation, etc. according to the degree of friction. can be sufficiently prevented. For this reason,
There is no problem even if the sheet conveyance belt 9 is arranged so as to come into contact with the low-speed reversal sorting belt 31 at the opposing portion.

Guide wall 35 and groove side wall 36 on document loading tray 7
The guidance of the sheet document 8 by one of the 1-steller sea lions and 136g-1 requires adjusting the position of the guide wall one by one, compared to the conventional method in which a guide wall is moved to guide documents of various sizes. No work required. Moreover, guide grooves 361 provided corresponding to various sizes,...
, 361 do not get in the way no matter what size of document 8 is stacked.

The guide grooves 361, . . . , 36s are arranged so that the side edges of the document 8 of the appropriate size are at an angle of 9 such that the droop is aligned with the vertical direction. The raised groove side wall 36 t-1 is difficult to climb over.

...+361B4 is formed.

The guide groove 361 is shown in FIGS. 8 to 11.

. . , 365 modified examples are shown. In the case of FIG. 8, the groove side walls 361- of the guide grooves 361, . . . , 36s
1 +...t 3 as-t A riding over-preventing protrusion 41 is provided at the upper end. In the case of Fig. 9, the groove side wall 361
-19...

36 and 1 are provided with grooves and projections 42 to prevent over-crossing. In the case of FIG. 10, the groove side wall 361. ll..., 36
．． -1 is provided with a climbing prevention height that protrudes above the upper surface of the tray 7, and is provided with climbing prevention sawtooth unevenness 43, and is also sloped so that the side edge of the document 80 hanging down into the grooves 361, . . . , 36s can easily follow. is being looked upon. In the case of FIG. 11, the groove side wall 361. -, .

...* It is said that the above-mentioned height for preventing passengers from riding over the vehicle is added to the 36-to-1.

In FIG. 12, a guide protrusion 441 is shown instead of a guide groove.
+44g... is provided, and the original [8 is for the protrusion that matches its size, if it is the first protrusion 441, it will remain as it is, and if it is after that, it will be changed to the protrusion that matches the size. Article 44! By hanging down at a position where it crosses over the protrusion 441 one position in front of ..., it abuts from the side and is guided in the same way as by the groove side wall.

FIG. 13 shows that when using the document stacking tray 7 in the above embodiment, both the document lower guide plate 45 in the sheet feeding section 3 and the lower guide plate 46 of the receiving path in the conveyance stop section 5 that follows it. This figure shows a case in which document guide walls 47 and 48 are provided following the guide wall 35 of the tray 7, which also prevents skew during the sheet document feeding process.

14 and 15 show that in addition to the guide walls 47 and 48, guide grooves 49 and 50 are formed in the lower guide plates 45 and 46 to guide the document on the opposite side of the original. As in the case of the tray 7 in the example, the document is guided from both sides to more reliably prevent skew during the document feeding process. Only one of the lower guide plates as shown in Fig. 14 and Fig. 15 may be used, or both may be used at the same time. The guide grooves 49 and 50 may be shallow since only one document is to be guided, but in the case shown in FIGS. 8 to 12, the guide grooves 49 and 50 can be modified in various ways.

Effects According to the present invention, the laminated sheet conveyed by the sheet conveying means is first moved by a low-friction, high-speed reversing sorting belt, which has a small facing angle on the sheet receiving side with respect to the sheet conveying means and has a large component force when pressed toward the sheet conveying means. The first stage reverse sorting action is
After being moderately pushed by the low-friction handling surface and by the high-speed reversal, several sheets on the conveying side continue to be pressed against the sheet conveying side by the low-friction, high-speed reversal handling belt, while being subjected to high-friction, low-speed reversal. The high-friction reverse sorting of the sorting belt is applied in a narrow wedge-shaped gap in the final single sheet clamping state, reliably and easily at low speed, so even if the laminated sheet is thin, it will not roll up at the tip. To surely feed only the sheets in contact with a sheet conveying means one by one without causing troubles such as damage and jamming.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts showing an embodiment of an automatic document feeder; FIG. 2 is a partially enlarged view showing a reverse sorting operation state;
FIG. 3 is a cross-sectional view showing the entire automatic document feeder, FIG. 4 is a partial perspective view of the sheet conveying means and reverse handling means,
FIG. 5 is a perspective view of both means in FIG. FIG. 12 is a partial side view showing a modified example of the document loading tray, FIG. 13 is a perspective view showing a modified example of the sheet guide section extending from the document loading tray of the automatic document feeder to the conveyance stop section receiving step; 14 is a perspective view showing a modified example of the sheet guide of the sheet feeding section, FIG. 15 is a perspective view showing a modified example of the sheet guide of the conveyance stop section receiving step,
FIG. 6 is a partial side view of a conventional example. P...Cross point

Claims (1)

[Claims] (1) A low-friction, high-speed reversing handling belt and a high-friction, low-speed reversing handling belt are arranged such that the opposite angle of the sheet receiving side viewed from the side with respect to the sheet conveyance means is lower than that of the high-speed reversing handling belt. The belts are arranged side by side so that the handling surfaces intersect when viewed from the side, and the conveying means is positioned closer to the sheet feeding direction than the intersection point of the handling surfaces of each handling belt. A sheet feeding device characterized in that a single sheet is pressed against a low speed reverse handling belt.