JPS59163245A - Sheet feeding device - Google Patents

Abstract

PURPOSE:To correct the posture of the sheet by a simple mechanism by a method wherein the sheet feeding device for a rotary camera or the like is provided with a sheet feeding roller, providing the sheet with a conveying force, and a guide plate, changing the conveying direction of the tip end of the sheet under conveyance. CONSTITUTION:First feeding rollers 1, 1' are arranged rotatably so as to be capable of rotating a copy supported between them. The copy 2, fed inbetween the feeding rollers 1, 1', is pinched by the feeding rollers 1, 1' at the substantially central position thereof to convey it downwardly, and when the tip end rim of the copy is abutted against the second guide surface 3b, the conveying direction thereof is changed into the right direction. The copy 2, whose conveying direction is changed, is fed inbetween the second feeding rollers 4, 4', subsequently, is fed inbetween glass plates 5, 5' by the second feeding rollers 4, 4', is illuminated by an illuminating lamp when it is passing between the glass plates 5, 5' and the picture of the copy is imaged by an imaging lense 10 onto a microfilm 11 moving with a constant speed synchronized with the same of the copy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet feeding device that conveys sheets such as cards and tissue paper, and more particularly to a sheet feeding device that corrects the posture of sheets.

2. Description of the Related Art Sheet feeding devices used in rotary cameras, facsimile machines, printing machines, copying machines, and the like have the disadvantage that various problems occur when sheets are transported at an angle with respect to the transport direction. For this reason, conventional sheet feeding devices of this type have a mechanism for automatically aligning the leading edges of sheets.

These conventional alignment mechanisms move movable guide plates provided on one or both sides of the sheet to correct the posture of the sheet that has been conveyed diagonally before reaching a predetermined position.
Although the slanted side portions of the sheet mentioned above are corrected by pushing them with this guide plate, when conveying sheets of different widths, the position of the guide plate must be changed, which is extremely troublesome.

Another alignment mechanism is to detect the posture of the sheet during conveyance and move the conveyance roller in the rotation axis direction to a desired position as necessary, or until the leading edge of the sheet reaches the desired state. It is known to rotate the roller at an angle. However, this mechanism has a complicated configuration;
There was a drawback that wrinkles appeared on the sheet.

An object of the present invention is to provide a sheet feeding device that can correct the posture of a sheet with a simple configuration and that does not require much effort.

The feeding device of the present invention includes a sheet conveying means that rotatably supports a sheet and applies a conveying force near the center of the sheet, and a sheet conveying means that contacts the leading edge of the sheet being conveyed by the conveying means to change the conveying direction of the sheet. It has a guide member.

- In the apparatus described in item 1, the conveying means is configured to support and convey the sheet so that when the leading edge of the sheet hits the guide member in an oblique position, the sheet can rotate around the contact position with the conveying means. Ru.

FIG. 1 shows a rotary microfilm camera to which the present invention is applied. In the figure, 1-1' is a first feeding roller that conveys a sheet-like original, and 3 is in contact with the leading edge of the original that is conveyed by the first feeding roller 1' to change the conveying direction of the original. Fixed guide plate, 4/4'
is a second feeding roller, and 5 and 5' are transparent glass plates placed opposite each other across the document conveyance path.

The first feeding roller 1' is arranged so as to be rotatable, and is in contact with the fg supported therebetween with an appropriate pressing force so that the document rotates.One feeding roller is connected to a motor (
(not shown). The feed roller 1φ1' is a narrow roller and is arranged so as to contact only the vicinity of the center of the document, and applies a conveying force to the center of the document.

The plate 3 is connected to the first feeding roller 1 as shown in FIG.
The guide surface 3a has a first guide surface 3a parallel to the direction of conveyance of the document sent by the direction 1, and a second guide surface 3b inclined with respect to the direction of conveyance.

The second guide surface 3b is arranged at a position where the distance between the contact portion of the first feeding roller 1' and the second guide surface 3b is shorter than the length of the sheet in the conveying force direction. Therefore, when the sheet is being nipped and conveyed by the first feeding roller 1', the leading edge of the sheet comes into contact with the second guide surface 3b.

3' is a second plate disposed opposite to the guide plate 3 across the document conveyance path.
The second guide plate 3', which is a guide plate, is not shown in FIG.

The second feed roller 4' is connected to a motor 9 via a pulley 7 and a heald 8, and is driven by the motor 9. The second feed roller 4' transports the document at the same speed as or faster than the first feed roller 1' to prevent the document from sagging.

10 is a lens that forms an image of the original document passing between the glass plates 5 and 5' on the microfilm 11, and 12 is a roller that feeds the microfilm 11. The roller 12 is connected to gears 13 and 14. The pulley 15 is connected to a motor 9 via a heald 16, and is driven by the motor 9.

In the two-leg device, the document 2 fed between the feed rollers 1' is held by the feed rollers 1' near its center and conveyed downward, and is then held between the feed rollers 1'. When the leading edge of the document hits the second guide surface 3b, the conveyance direction is changed to the right by this guide surface. The document 2 whose conveyance direction has been changed by the second guide surface is fed between the second feed rollers 4 and 4', and then between the glass plates 5 and 5' by the second candy feed rollers 4 and 4'. and is illuminated by an illumination lamp (not shown) as it passes between the glass plates 5 and 5'. An image of the illuminated original is formed by an imaging lens 10 on a microfilm 11 that moves at a constant speed in synchronization with the original.

Now, in the diagonal position as shown in Figure 2 or Figure 3,
When conveyed by the feed roller, the corner of the leading edge of the document being conveyed by the first feed roller 1' first hits the second guide surface 3b. If the original is transported in this state,
A force couple is generated on the document 2 by the conveyance force g by the feeding roller 1', the reaction force f caused by the contact between the second guide surface 3b and the leading edge corner of the document, and the waist of the document itself. and the first feeding roller 1' rotate clockwise around the contact point with the first feeding roller 1', and as the document progresses, its posture is gradually corrected to the correct posture shown by the broken line, and the second candy feeding rollers 5, 5 ’.

The first feeding roller 1' has a narrow width in the axial direction, and is designed to grip a narrow area near the center of the document, and is in contact with the document with enough pressing force to rotate the document. The original rotates around the contact position with roller 1-1'. The first guide surface 3a and the second guide surface 3 of the guide plate 3
b (the angle between the document conveyance direction and the second guide surface) θ is set by the surface friction coefficient k of this guide surface 3b.

FIG. 4 shows the relationship between the optimum angle θ and the friction coefficient, and as the friction coefficient angle of the second guide surface increases, it is necessary to increase the angle θ required to correct the posture of the document.

When the kite board 3 is made of a material with a smooth surface such as synthetic resin, it is desirable to set the angle θ to 110° to 1300°.

The distance between the feed roller No. 1 1' and the second guide surface 3b is set depending on the stiffness of the sheet to be conveyed.

If the seat's waist is weak, the distance must be shortened; if the seat's waist is strong, the distance may be increased.

FIGS. 5(A) and 5(B) show other embodiments of the first feeding roller, and FIG. 5(A) shows a combination of rubber rollers 51 and 51' whose outer peripheries are curved in an arc shape, and the fifth feeding roller. Figure (B) shows a combination of a driving rubber roller 151 whose outer periphery is curved in an arc shape and a steel ball 152. 153 is roller 15
1, the drive shaft 154 indicates a coil spring for pressing the steel ball 152 against the roller 151 with an appropriate force. The roller 15+ and the ball 152 make point contact.

Also, a round belt may be used instead of the roller.

FIG. 6 shows an automatic document feeder according to another embodiment of the present invention. Reference numeral 20 denotes a document mounting table that accommodates sheet-like originals m21 in a stacked state in an inclined state; 22, a narrow feed roller that contacts only the approximately central portion of the document 21; and 23, a feed roller across the document conveyance path. 22 is a separation roller whose width is narrower than the width of the original document. The feed roller 22 is rotationally driven in the direction of the arrow, is made of a material having a larger surface friction coefficient than the separation roller 23, and has a cylindrical shape with a narrow width as shown in FIG. The separation roller 23 is driven to rotate in the direction of the arrow to prevent more than one document from being fed. As shown in FIG. 7, the separation roller 23 has a cylindrical shape with a concave central portion.

Reference numerals 25 and 26 designate guide plates that change the conveyance direction of the document being conveyed by the feed roller 22 in two stages. The leading edge of the document transported in the X direction by the feed roller 22 first hits the first guide plate 25 and changes the transport direction downward Y, then hits the second kite plate 26 and changes the transport direction to the right. is changed and sent between the second feeding rollers 27 and 28. The distance between the facing portions of the rollers 22 and 23 and the second guide plate 26 in the conveyance direction is set to be shorter than the length of the document in the conveyance direction. When the document 21 is conveyed obliquely with respect to the conveyance direction, when it hits the 1φ second guide plates 25 and 26, the feed roller 22 rotates around which contact portion it touches, and its posture is corrected. In this embodiment, the posture of the document is corrected in two stages. When conveying various sheets with different widths, approximately the center of the sheet in the direction perpendicular to the conveying direction is the roller 2.
Each sheet is conveyed so as to be in contact with 2 and 23.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a rotary camera showing one embodiment of the present invention, Fig. 2 is a side view of the document supply section, Fig. 3 is an explanatory diagram when correcting the posture of the document, and Fig. 4 is! Graphs showing the relationship between angle θ and friction coefficient μ suitable for 1, Figures 5 (A) and (B)
6 is a sectional view showing another embodiment of the first feeding roller, FIG. 6 is a side view of an automatic document feeder according to another embodiment of the present invention, and FIG.
The figure is a sectional view of the rollers 22 and 23. l・1'---1 Feeding roller 3------Guide plate No. O 2 Male 7 Hard? 2

Claims (1)

[Claims] The sheet conveying means rotatably supports the sheet and applies a conveying force to the vicinity of the center of the sheet, and the guide 1 member contacts the leading end of the sheet being conveyed by the conveying means and changes the conveying direction of the sheet. sheet feeding device.