JPS6093049A - Sheets supply device - Google Patents

Abstract

PURPOSE:To secure a sheet transport with good performance by furnishing a sheet-shaped member in the neighborhood of the part, in which sheet biting by the roller couple is made, and thereby providing smooth biting of the sheet by roller couple CONSTITUTION:Several sheets 2 in the undermost position of the sheet stack 2 on a sheet place table 1 are sent by an aux. roller 14 in the direction of arrow a. These sheets 2 sent are separated individually by a transport belt 6 and a separator belt 10, and sent along guides 18, 20 for a roller couple 15, 16. In this period the roller couple 15, 16 are at a standstill, and the leading edge of each individual sheet 2 is guided by the guide 20 consisting of a sheet-shaped member so as to run against the bite-in part of said roller couple 15, 16. Because both belts 6, 10 continue to run thereafter, the sheet 2 is bent in the space of the sheet feed path 21, and when a sensor 19 has sensed the leading edge 2 of the sheet 2, the belts 6, 10 shall be stopped and the roller couple 15, 16 be rotated in stead. Thus bite-in transport of the sheet 2 can be made smoothly while the sheet is pressed to the bite-in part by the guide 20 with its resilient force.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet feeding device and a copying machine using the sheet feeding device, and more particularly to a sheet feeding device that causes a sheet to bend during sheet feeding.

In the sheet feeding device, which consists of a pair of rollers that abuts the leading edge of the sheet against a pair of rollers to bend the sheet and then transport the sheet, the pair of rollers feeds the sheet after forming the bend. If the sheet suddenly hits a part away from the biting part of the roller, it may jam or the sheet may not be fed. To prevent this, it is necessary to bring the leading edge of the sheet as close as possible to the biting part of the roller pair. Therefore, it was necessary to pay attention to the shape of the guide for guiding the leading edge of the sheet to the pair of rollers, the gap between the guides, and the like.

Further, when the feeding path for feeding the sheet to the roller pair is curved, it is particularly difficult to bring the sheet close to the biting portion of the roller pair.

An object of the present invention is to solve the problems of the sheet feeding device described above and to provide a sheet feeding device that smoothly transports sheets.

The present invention provides a sheet feeding device equipped with a pair of rollers and a sheet feeding path that temporarily stops the leading edge of the sheet to bend the sheet and then conveys the sheet when feeding the sheet. This is an arrangement of parts.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a sheet feeding device showing an embodiment of the present invention, and the first is an enlarged longitudinal sectional view of the sheet feeding device constituted by a pair of rollers and a feeding path. l is sea 1-. 2 is a sheet mounting table on which a bundle is placed, 3 is a belt boob IJ, g
The conveyor belt is rotated in the direction of arrow A in the figure by the conveyor belt drive shaft to which it is fixed.

A feeding belt 6 is wound around the belt boob IJ, t, 5-a, and moves in the direction of arrow a in the figure.

7 is belt boo IJ? The separation belt is rotated in the direction of arrow B in the figure by the drive shaft to which it is fixed. Zaha belt pulley 9a
This is the separation belt driven shaft that fixes the. Belt Boo I
J? , 9L is wrapped around a separation belt /θ, which moves in the direction of the arrow in the figure. Furthermore, if the mass coefficient between the feed belt 6 and the JITCO is μm, the mass coefficient between the separation belt IO and the sheet is μ2, and the mass coefficient between the JETCO and μ3, then the relationship is 〉μ2〉μ3. The two sheets of JETCO that have come between the feed belt 6 and the separation belt IO are separated and fed into one sheet in the direction of arrow a. l
/ is a backup roller that prevents the feeding belt 6 from being bent.

An entrance guide 2 is provided in front of the feeding belt 2 to prevent a large number of bundles of JITCO from being fed at once. A half-moon-shaped auxiliary feed roller /4' is fixed to a shaft /3 provided at the bottom of the loading table l, and rotates in the direction of arrow C in the figure to feed the bottom sheet of the JITCO bundle in the direction of arrow a. It acts on A conveyance drive roller 15 and a conveyance driven roller 16 are provided in pressure contact with each other in the feed path 2/, and are configured to rotate in the direction of the arrow E in the figure. A feeding path is formed by the upper sheet guide l and the lower sheet guide 1, and the sheet is separated into a single sheet by a pair of rollers. , /A functions to lead to the biting part.

A reflective sensor 19 detects the end of the sheet 2 passing between the sheet guides 71. A guide 20 made of an elastic sheet is glued from the upper end of the feeding path 2/ side of the sheet upper guide 17 to just before the conveyance driven roller /A, and further extends to the conveyance roller pair r. It has reached the biting part of /A (3) just before being bitten (Figure 2).

The lowest few sheets of the bundle of sheets j on the sheet stacking table are fed in the direction of arrow a by an auxiliary feed roller/ll. The several sheets of JETCO that have been sent are separated into one JETCO by the conveyor belt 6 and the separation belt lO, and are moved along the guide tg and the roller pair 7! , /A.

Laura vs.! , /A is stopped during that time, and the tip of the JITCO, which has become one piece, is a guide guide, which is an elastic sheet.
A pair of rollers guided by 20 / &.

/It hits the biting part of A. After that, the feed belt 6 and the separation belt 1O continue to rotate, so that the JETCO is bent in the space of the feed path 21.

After a predetermined time has elapsed after the leading edge of the sheet is detected by the sensor/q, the feeding belt 6 and separation belt 10 stop rotating, and the sheet stops in a bent state. Next, after a certain period of time, roller pair/! , /A starts rotating. At this time, the JETCO roller pair 7 due to the elasticity of the sheet due to bending! ,/Because it is pressed against the biting part of A, the mouth (da) -ra pair/,? , /l, and is conveyed in the direction of arrow F in the figure.

This will be compared with the conventional example to clarify the effects of the present invention.

FIG. 3 is an enlarged vertical cross-sectional view of the stop conveyance device without the guide guide 0 made of an elastic sheet. now,
As mentioned above, the sheet is moved along the guide and the roller pairs are moved along the guide. , /l, is sent. Since the feeding path 2/ is curved, the tip of the GITCO is fed along the sheet top guide. Therefore, the tip of the roller pair is stopped/! ; , /A is bent by colliding with the intersection of the driven roller /4 and the sheet guide l1.

Since the sheet a is bent, a pressing force is applied to the surface of the sheet upper guide L, a frictional force is generated between the GITCO and the sheet upper guide L, and when the roller 16 starts rotating, the tip of the sheet A and the roller Although the sheet J attempts to be separated from the surface of the sheet upper guide 17 by the frictional force with the surface of the sheet JETCO 16, the pulling force cannot overcome the frictional force between the JETCO and the sheet upper guide 17. Zitco is Laura vs. /A;, //
, it happened that he was not guided by the eating part of the game, and Zitko successfully played against Laura/! f.

There were cases where the biting part of /A did not bite.

As explained above, the present invention allows the sheet to be bitten smoothly into the roller pair by disposing a sheet-like elastic member near the biting part of the roller pair that temporarily stops the sheet and bends the sheet. It has a tightening effect.

, 4. Brief description of the drawings FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG.
The figure is an enlarged vertical cross-sectional view of a conventional example.

λ...Sheet 6.e feeding belt 10% separation belt lj...conveyance drive roller 16...conveyance driven roller
/ri...Guide on the sheet -〇...Guidance guide.

(the law of nature) ■ To To – Figure 3 Figure 2

Claims (1)

[Claims] l In a sheet feeding device equipped with a sheet feeding path and a pair of rollers that temporarily stop the leading edge of the sheet to bend the sheet and then convey the sheet, a sheet-like member is placed near the biting part of the pair of rollers. A sheet feeding device characterized by having: