JPS63180495A - Roll paper feeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a paper feeding device using roll paper, which is applied to copy paper, printers, facsimile machines, and the like.

(Conventional technology) The prior art will be explained using FIGS. 6 and 7.

1 is a roll paper, and 2.4.5 is a 1st part that conveys the paper unwound from the roll paper. Second. This is the third paper feed roller, and the first paper feed roller. The paper feeding speed of the second paper feeding roller 2.4 is set slightly faster than the paper feeding speed of the third paper feeding roller 5. A cutter 3 cuts the paper at a predetermined timing. After the paper is cut, it waits at position A in the figure.

The operation will be explained below. The paper unwound from the roll paper 1 usually starts to be conveyed from position A, passes through the second and third paper feed rollers 4 and 5, and is sent to the photoreceptor 6. At this time, the first
．． Since the paper feed speed of the second paper feed roller 2.4 is set slightly faster than the paper feed speed of the third paper feed roller 5, there is a gap between the second paper feed roller 4 and the third paper feed roller 5 during conveyance. Gradually form a detour for the paper.

After this, the cutter 3 operates at a predetermined timing, but
At the contact point between the rotary blade 8 and the fixed blade 7 of the cutter 3, in other words, at the cutting point, the paper being conveyed is pulled in the opposite direction to the conveyance direction. For this reason, a slight slip occurs between the rollers after the cutter 3 and the paper, but this slip occurs after the third paper feed roller 5, and the paper is prevented from shifting on the photoreceptor 6 (referred to as cutter shock). A detour section for paper is provided between the second paper feed roller 4 and the third paper feed roller 5 using the method described above. The problems with this type of paper feeding device are shown below.

As the rotating blade 8 and the fixed blade 7 contact each other to cut the paper that is being fed at full speed, it takes a predetermined time to cut the paper from one end to the other, so the paper is cut diagonally as shown in Figure 2. below,
(referred to as diagonal cutting). To prevent this, cutter 3 in advance.
are installed diagonally by an amount represented by n in the figure. However, since the cutting condition changes depending on the thickness, type, etc. of the paper, the value of n is not constant, and diagonal cuts occur due to this variation.

(2) The following are problems when setting new roll paper in this type of paper feeder. First, I will explain how to set it up.

- Add the leading edge of roll paper 1 to the first paper feed roller.

■Turn the knob (not shown) provided on the first paper feed roller shaft by hand to guide the leading edge of the paper to the cutter 3 and beyond.

■Turn the knob (not shown) provided on the cutter shaft by hand to cut the paper.

■Remove the cut pieces of paper.

In this case, as explained in (1), the stopped paper
Since the cutter 3 was installed diagonally, the paper was cut diagonally by the amount shown in FIG. 2n.

In summary, when a new roll of paper is set in this paper feeder, the first sheet of paper will be deformed.

(3) In order to reduce the diagonal cut shown in Figure 2n, it is possible to increase the rotation speed of the rotary blade 8, but generally speaking, if the cutter is used at high rotation speed, its life will be shortened. Are known.

(41!+1 In order to cut the paper that is being fed, the paper is moving in the conveying direction at the contact point between the rotary blade 8 and the fixed blade 7, in other words, at the cutting point. This direction is the cutting direction of the cutter 3. are different, so the fibers of the paper at the cutting point move while being caught by the rotating blade 8 and the fixed blade 7.

For this reason, not only fiber fluff occurs at the cut portion of the paper, but also paper fiber powder called paper dust is generated. If this adheres to the paper and is conveyed, problems will occur in image formation during the transfer process (see the outline of the copying machine explained in FIG. 5).

(Purpose) The present invention was made based on this background,
The purpose of this invention is to prevent diagonal cuts when cutting paper in a paper feeder that unwinds and transports roll paper.

(Structure) FIGS. 1 and 2 show an embodiment of the present invention. Descriptions of the same contents as before will be omitted.

The cutter 3 is installed so as to cut the paper at right angles to the conveyance direction, has a lower portion supported by a support plate 16, and is configured to be movable in the conveyance direction with a shaft 18 as a fulcrum. A cam 14 is provided at the end of the support plate, and the support plate 16 is constantly pressed against the outer periphery of the cam 14 by a spring 15.

The rotating blade of the cam 14 is transmitted from the cutter moving motor 9 via a worm gear and gears 10.11. A light shielding plate 12 is provided on the cam shaft and the rotary blade shaft, and a part thereof has a notch, which is detected by a transmission sensor 13. Further, positioning plates 20 are provided on both shafts, and rollers are engaged with the notches of the positioning plates 20 to hold the cam 14 and the rotary blade 8 at predetermined positions.

Reference numeral 19 is a knob for manually rotating the cutter, and reference numeral 17 is a motor that drives the rotary blade of the cutter.

The operation will be explained below.

The paper unwound from roll paper 1 is A as before.
Conveyance starts from the second position. It passes through the third paper feed rollers 4 and 5 and is sent to the photoreceptor 6. Thereafter, the paper is cut by the cutter 3, but a predetermined time before the cutting starts, the cutter moving motor 9 is activated and rotates the cam 14. This causes the cutter 3 to move in the paper conveyance direction. The shape of the cam is set so that the moving speed at this time is the same as the conveying speed of the paper, and during this time the cutter drive motor 17 is started and the paper is cut to an arbitrary length. The cutter drive motor 17 rotates slightly by inertia at 0FFL when the notch of the light shielding plate 1i 12 b reaches a predetermined position, and then the roller engages with the notch of the positioning plate 20b, preventing rotation and stopping. . This causes the rotary blade to return to the point before starting operation.

After cutting is completed, the cam 14 further rotates from the position shown in FIG. 2C, and the cutter 3 moves in the opposite direction to the conveying direction. Thereafter, the cutter moving motor 9 moves to 0FFL when the notch of the light shielding plate 12 on the camshaft reaches the desired position, and the cutter 3
Then, the cam 14 returns to its original standby position. This positioning is also performed by the positioning plate 20a, similar to the positioning of the rotary blade.

In this embodiment, the cutter 3 is moved in the conveyance direction by the cam 14, but the same operation can be performed by using gears or the like. The second embodiment will be explained using FIGS. 3 and 4. Descriptions of the same contents as in the first embodiment will be omitted, and only the means for moving the cutter 3 will be described.

The cutter 3 has a cutter drive motor 17 on its side plate, which operates via a partially toothed gear 25, a gear a26, and a gear b28.
Transmits rotational force to the rotating blade. The toothless gear 25 on the cutter drive motor shaft has a toothless portion in its tooth portion, and is configured so that the toothless portion corresponds to the tooth portion of the gear a26 after cutting. A one-way clutch 31 that transmits only the rotational force in the cutting direction is provided between the gear b2B and the rotary blade shaft. Further, the gear b28 meshes with the rack 29, and moves the cutter in the transport direction when the gear rotates, in other words, when cutting. As in the first embodiment, the drive system is configured so that the moving speed at this time is equal to the conveying speed of the paper.

The cutting operation will be explained below.

As shown in FIG. 4, the partially toothed gear 25 is a
The missing tooth portion is stopped at a position corresponding to the tooth portion of No. 26. At the start of the cutting operation, the cutter drive motor 17 is activated to rotate the partially toothed gear 25 in the direction of the arrow in the figure. In conjunction with this, rotational force is transmitted to gear b28 via gear a26. At this time, as described above, since the positional direction clutch 31 is in the connected state, the rotary blade rotates and the cutter also moves in the conveyance direction. Thereafter, after the paper is cut by contact between the rotary blade and the fixed blade, the toothless gear 25 uses the rotational force of the rotary tooth and the conveyance direction of the cutter 3 to make the toothless part correspond to the tooth part of the gear a26. The ability to move to is lost. Therefore, the rotary blade rotates due to inertia, and the cutter 3 is moved by the spring 15 in the opposite direction to the conveyance direction. After that, the rotary blade rotates by inertia as in the first embodiment, and then the positioning plate 2
At the same time as stopping by engaging the roller with the notch of 0,
The cutter stops at the position before operation by abutting the end of the cutter side plate against the bent portion B of the main body side plate 30.

As described above, in the first and second embodiments, cams and gears are used, but various other drive transmission means may be used.

In the two embodiments described above, the cutter 3 is installed perpendicular to the conveyance direction and is moved at the same speed as the conveyance speed, but the cutter 3 is moved from a position perpendicular to the conveyance direction. Install it diagonally by the angle θ, and 'Jy −L/l Xtanθ+V c ・・・・−■
(See Figure 7) L: paper width t: paper cutting time Vr: paper conveyance speed vc: cutter moving speed.Even if the cutter is moved in the conveyance direction to cut, the effect described later can be obtained. It will be done. However, in this case, 1.
The effect is also smaller in the second embodiment.

FIG. 5 schematically shows a copying machine equipped with a roll paper feeding device, and the reference numerals used are unique to FIG. 5.

The original 102 inserted from the original insertion table 101 is moved to a roller 103a as shown by the dashed line.

After being conveyed inside the copying machine by 103b, 103c, 103d, and 103e, the document is discharged onto the document tray 104. The transported document is illuminated by a lamp 105 inside the copying machine, and the reflected light from the document at that time is reflected by a first mirror 106 . In-mirror lens 107. Third mirror 10
8 and a fourth mirror 109, and is guided onto a drum photoreceptor 110. The photoreceptor 110 starts rotating counterclockwise in the figure at a predetermined timing, and after its surface is uniformly charged by the charging charger 111, it is exposed by the exposure unit. Through this exposure, an electrostatic latent image corresponding to the image of the original 102 is formed on the photoreceptor 110.

The latent image thus formed is developed by a developing device 117 to become a developed image.

A roll of copy paper 114 placed at the bottom of the copying machine is fed to the photoreceptor 110 by a paper feed roller 115. Here, the developed image is superimposed on the developed image on the photoreceptor, and then the developed image is transferred onto copy paper by a transfer operation by a transfer charger 124. The copy paper subjected to the transfer operation is separated from the photoreceptor by a separation charger 125, further cut into a predetermined length by a cutter 116, and conveyed to a fixing roller by a belt on a separation tank 118. The fixed copy paper passes through a paper ejection roller 120, a paper ejection belt 121 and 122, and is ejected onto a copy tray 123. 113 is a cleaning device, and 112 is a static elimination charger.

(Effects) As described above, the present invention has the following effects because the cutter cuts the paper while moving with it.

(The paper being fed is at the point of contact between the rotating blade and the fixed blade (
Since the conveyance speed is less disturbed than before due to being pulled in the opposite direction to the conveyance direction at the cutting point), diagonal cuts are reduced. Furthermore, since the paper is less likely to get caught at the cutting point, it is possible to prevent the generation of paper powder and the fuzzing of the paper cutting section.

(2) The diagonal cut caused by the change in the cutting speed of the rotary blade and its rotational speed is smaller than before.

The above effect is maximized when (paper conveyance speed VF) - cutter movement speed Vc).

(3) Unlike the conventional method of increasing the cutter rotation speed to prevent diagonal cutting, there is more leeway in setting the cutter rotation speed, and it can be used at a rotation speed for a long life (the cutter rotates at high speed). (This will significantly shorten the life of the blade.)

Also, if the cutter is installed perpendicular to the conveying direction,
Prevents diagonal cuts when rotating the cutter manually. Furthermore, by changing the rotational speed of the blade and the moving speed of the cutter, it is possible to adjust the diagonal cutting, and there is also the effect that there is no need to bother with changing the angle θ.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing the roll paper cutter mechanism according to the first embodiment of the present invention, FIG. 2 is a diagram showing the swinging state of the cutter, and FIG. 4 is a plan view of the main parts, FIG. 4 is a side view, FIG. 5 is a schematic diagram of a copying machine to which this paper feeding device is applied, and FIG. 6 is a simplified diagram of a roll paper feeding mechanism according to a conventional example. Figure 7 shows the cutter, (a
1 is a front view, and crest) is a side view. 2...First roller, 3...Cutter, 4...Second roller. Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] A first roller that unwinds and conveys a roll of paper, and two cutting edges that abut each other downstream of the first roller, and one of which rotates as a fulcrum of its axis. In particular, in a paper feeding device that includes a cutter that cuts paper from one end to the other end in a predetermined time, and a second roller that conveys the cut paper downstream of the cutter, the cutter may be used to It is installed perpendicular to the conveyance direction or at an angle of θ, and is configured to be movable in the conveyance direction, with the paper conveyance speed being V_F and the cutter moving speed in the conveyance direction being V_F.
_C, paper cutting time is t, paper width is L, then immediately before or at the same time as cutting starts, V_F=V_C and θ=
0 or V_F=L/tXtanθ+V_C, the cutter is moved in the conveyance direction, and cutting of the paper is completed during this time.