JPH028924Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a manual paper feeder, and more particularly to a manual paper feeder equipped with a mechanism capable of removing curls from sheets.

Prior Art In general, one sheet is manually inserted into a copying machine.
2. Description of the Related Art Copying machines equipped with a manual paper feeder for feeding sheets one by one are widely used. When using a manual paper feeder, the user performs the paper feeding operation himself/herself, so with conventional manual paper feeders, the sheet can be pushed straight into the paper feed slot, and the manual paper feeder's It has a structure that prevents the sheet from lifting off the sheet placement surface.

However, the conventional manual paper feeding device described above does not have a structure that can remove curls from sheets, so if curled sheets are fed as is, double transfer or white spots may occur in the transfer section. Inconveniences arise in that transfer defects such as the like occur, or the sheet wraps around the photoreceptor drum, resulting in poor separation. In addition, the user may manually straighten the sheet before feeding, but this has the disadvantage of complicating the copying operation and causing the sheet to become strangely curved. Such inconvenience is particularly noticeable when a thick sheet such as a postcard is curled or a stiff sheet is curled.

Purpose This invention was made in view of the above-mentioned disadvantages, and its purpose is to provide a manual paper feeder that can easily and reliably remove curls from sheets and straighten them when manually feeding paper. Our goal is to provide the following.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

A manual paper feeder 1 according to the present invention is shown in FIG.
As shown in FIG. 2, it is formed into a box shape with a planar plate, and both side parts 1a, 1a and rear end side part 1c are bent substantially downward. The front end 1d of the manual paper feeder 1 has a notch 1e for locking the manual paper feeder 1 to a locking pin 22 (see FIG. 3) fixed to the manual paper feed port 21 of the copying machine 20. It is provided. When the manual paper feed device 1 is attached to the manual paper feed port 21, the sheet on the top surface of the manual paper feed device 1, that is, the sheet placement surface 1f is inserted into the manual paper feed port 2.
The sheet placement surface 1f is inclined to such an extent that the sheet placement surface 1f slides down toward the surface 1 due to its own weight.

On the sheet placement surface 1f, a pair of guide plates 2, 2 are disposed facing each other and are movable in a direction perpendicular to the sheet feeding direction, and the interval between them can be adjusted as appropriate depending on the sheet width. There is.

The guide plates 2, 2 are guided by guide grooves 3, 3 provided on the sheet placement surface 1f, and can be moved toward or away from each other in a direction perpendicular to the sheet feeding direction. Further, the outer edges of the guide plates 2, 2 rise upward, and this rising portion 2
The tip portions of a and 2a are further bent inward, and the front portions of these bent portions 2b and 2b are formed with guide grooves 2c and 2a by bent portions 2b and 2b and rising portions 2a and 2a, respectively. 2c is formed. The guide grooves 2c, 2c have a groove width that allows even thick sheets to pass through easily, and are formed up to the front end 1d of the manual paper feeder 1.

Further, a curl sheet insertion port 4 and a curl sheet discharge port 5 are provided at the rear end and front end of the sheet placement surface 1f, extending in a direction perpendicular to the sheet conveyance direction and open to the atmosphere. At the same time, the rising portions 2a, 2a extend above the curl sheet insertion opening 5. Also, inside the manual paper feeder below the sheet placement surface 1f,
A curl sheet guide path 6 is formed. As shown in FIG.
A curved surface that curves in a substantially horizontal direction while falling downward, a plane that is substantially parallel to the sheet placement surface 1f, and a curved surface that curves upward from the substantially horizontal direction toward the sheet placement surface 1f until reaching the curled sheet discharge port 5. It is formed by a guide plate 7 having a curved surface and a lower guide plate 8 having the same cross-sectional shape as the upper guide plate 7. The guide plate 8 is the bottom plate 1 of the manual paper feeder 1
It is rotatably supported by a shaft 10 fixed to a support plate 9 fixed to the rear end of the shaft. The gap between the curled sheet guide passages 6 is set to such an extent that a thick sheet that can be used in the copying machine 20 can easily pass therethrough.

Further, a sheet pressing roller 11 is provided near the curled sheet discharge port 5 of the curled sheet guide path 6. This sheet pressing roller 11 has a shaft 12
The shaft 12 is supported by both sides 1a, 1a of the table 1 so as to be able to move up and down, and is biased upward by a compression spring 13. This compression spring 13 has one end connected to the shaft 12.
The other end is fixed to the main body of the device 1. Therefore, the sheet pressing roller 11 is compressed by the compression spring 1.
3, and the urging force of the compression spring 13 whose peripheral surface of the roller 11 is in contact with the inner surface of the upper guide plate 7 is due to the stiffness of the sheet fed into the curled sheet guide path 6. Therefore, the sheet pressing roller 11
is set to such an extent that it easily enters the relief groove 14 provided in the lower guide plate 8.

Furthermore, a presser foot fine adjustment screw 15 is provided near the sheet pressing roller 11 to finely adjust the pressing force of the sheet pressing roller 11 against the sheet. This presser foot pressure fine adjustment screw 15 enters a screw hole 7a provided in the upper guide plate 7 and is screwed into the lower guide plate 8. When the screw 15 is turned in the direction of loosening, the gap between the upper guide plate 7 and the lower guide plate 8 increases, the contact between the circumferential surface of the sheet pressing roller 11 and the surface of the upper guide plate 7 is relaxed, and the pressing of the sheet pressing roller 11 against the sheet is reduced. Pressure becomes weaker. on the other hand,
When the screw 15 is turned in the loosening direction, the gap between the upper guide plate 7 and the lower guide plate 8 becomes narrower, and the contact between the circumferential surface of the sheet pressing roller 11 and the surface of the upper guide 7 becomes stronger, thereby further compressing the compression spring 13. , the pressing force against the sheet becomes stronger. By adjusting the pressing force of the sheet pressing roller 11 against the sheet in this manner, curl removal processing corresponding to the curled state of the sheet can be performed.

Next, when manually feeding paper using the manual paper feeder configured as described above, the manual paper feeder 1 is connected to the locking pin 2 of the copying machine 20 as shown in FIG.
2, the table 1 is attached to the manual paper feed slot 21. When manually feeding a normal sheet that is not curled, place the sheet on the sheet placement surface 1f, adjust the facing width of the guide plates 2, 2 to the width of the sheet to be used, and then open the manual paper feed slot 21.
Just push it inside. When the sheet detector 24 provided near the manual feed rollers 23, 23 is actuated by the pushed sheet, the manual feed rollers 23, 23 rotate in the sheet feeding direction and feed the sheet to the next process.

On the other hand, when manually feeding a curled sheet S, place the curled sheet S with the curled concave side facing up.
is inserted into the curl sheet guide passage 6 from the curl sheet insertion opening 4. The inserted curl sheet S reaches the curl sheet discharge port 5 while being pressed by the sheet pressing roller 11, and the guide plate 2,
After contacting the folded portions 2b, 2b of No. 2, the curled sheet S is fed into the manual paper feed port 21 while being guided within the guide groove 2c so as to curl in the direction of warping against the upper surface of the curled sheet S. Curled sheet S sent in
When the sheet detector 24 is activated by
is held between the rollers. When the curled sheet S is held between the manual feed rollers 23, 23, it is pulled and conveyed in the sheet feeding direction.
At this time, the curl sheet S is pressed by the sheet pressing roller 11.
The curled sheet S is held in a tensioned state by the manual feed rollers 23 and 23, and the curled sheet S comes into contact with the end surface 1h of the sheet placement surface 1f facing the curled sheet discharge port 5, and the curled sheet S 1
It is squeezed a little by h. In this way, curl sheet S
By squeezing, curls are removed and the hair is straightened.

A curled sheet can be easily straightened as described above, but by operating the presser foot fine adjustment screw 15, the sheet can be straightened regardless of the thickness of the sheet and the degree of curl. Can perform curl removal processing. First, when manually feeding a curled thick sheet, use the presser foot pressure fine adjustment screw 1.
5 in the tightening direction to increase the pressing force of the sheet pressing roller 11 against the sheet, so that the sheet is strongly squeezed by the end surface 1h. When manually feeding a thin sheet or a sheet with a small degree of curl, turn the presser foot fine adjustment screw 15 in the loosening direction to weaken the pressing force of the sheet pressing roller 11 against the sheet, so that the sheet is 1 hour so that it is lightly squeezed.

Further, in the above embodiment, the distance from the curl sheet insertion opening 4 to the manual paper feed rollers 23, 23 via the curl sheet guide path 6 is set shorter than the length of the smallest size sheet among the sheets used, Even the smallest size sheet can be reliably decurled.

Effects As is clear from the above explanation, according to the present invention,
Even if the manually fed sheet is curled, you can remove the curl and straighten the sheet with a simple operation, and at the same time, the paper feeding position of the sheet may shift. Without,
The sheet can always be reliably fed to the appropriate position relative to the paper feed roller. Furthermore, when manually feeding curled sheets and non-curled sheets in succession, you can simply change the way the sheets are set and there is no need for any other special switching operations. It is possible to feed paper that is ready for the sheet.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance of the apparatus of the present invention, FIG. 2 is a cross-sectional view of the apparatus of the present invention, and FIG. 3 is a cross-sectional view of essential parts showing the state of sheet decurling. DESCRIPTION OF SYMBOLS 1...Manual paper feeder, 1f...Sheet placement surface, 1h...End face (protrusion member), 2...Guide member, 2b...Bending portion (sheet guide member), 2c
... Guide groove, 4 ... Curl sheet insertion port (sheet insertion port), 5 ... Curl sheet discharge port (sheet discharge port), 6 ... Curl sheet guide path (paper feeding path), 11 ... Sheet pressing roller (resistance member), 2
3...Manual paper feed roller (paper feed roller).

Claims (1)

[Scope of Claim for Utility Model Registration] In a manual paper feed device that feeds manually pushed copy paper to a paper feed roller, a sheet placement surface 1f provided on the top surface of the manual paper feed device; and the sheet placement surface 1f. a sheet insertion port 4 provided in the sheet insertion port 4; a sheet discharge port 5 provided in the sheet placement surface 1f and located closer to the paper feed roller 23 than the sheet insertion port 4; a paper feed path 6 leading to the discharge port 5; and a resistance member provided in the paper feed path 6 to apply conveyance resistance to the copy paper fed by the paper feed roller 23 to maintain the copy paper in a tensioned state. 11, a projection member 1h provided on one side edge of the sheet discharge port 5 on the paper feed roller side and presses one side of the copy paper being conveyed in a tensioned state; , and a pair of guide members 2 having sheet width regulating surfaces parallel to the conveyance direction of the copy paper and movable on the sheet placement surface 1f in a direction perpendicular to the sheet feeding direction. , has a guide surface that is substantially parallel to the sheet placement surface 1f and located above the sheet discharge port 5, and transfers the copy paper to the paper feed roller 23 between the guide surface and the sheet placement surface 1f. A guide groove 2c for guiding the sheet is formed, and a sheet guide member 2b is provided integrally with each guide member 2, and the guide member 2 extends above the sheet insertion opening 4. A manual paper feeder characterized by: