JPS60204550A - Sheet material feeder - Google Patents

Abstract

PURPOSE:To correctly register a sheet material with an O-point marker by transporting the sheet material, the inclination of which is corrected by a register finger, corresponding to detection on O-point marker of a photoreceptor drum in a sheet material feeder of an electrophotographic copying machine. CONSTITUTION:A sheet material feeder comprises a register roller 20 for transporting a sheet material 12 to a position where a photosensitive drum 1 is disposed at a speed equal to the peripheral speed of the drum 1 with rotation of the drum 1, a nip roller 21 capable of freely engaging and disengaging with the register roller 20, and a register finger 22 disposed in a transport path 14 for checking the transportation of the sheet material 12. The feeder further comprises detection means for detecting the pressure contact of the finger 22 with the left and right ends of the sheet material 12, the first control means for stopping the roller 20 according to the detection, engaging the roller 21 with the roller 20 to clamp the sheet material 12, and releasing the checking of the transportation of the sheet material 12, and the second control means for releasing the engagement of the roller to transport the sheet 12 when detection means 25 detects a designated position 1M on the drum 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sheet material feeding device I that feeds sheet material to a predetermined position on a drum that rotates at a constant rotational speed. .

[Prior art]

An electrophotographic copying machine using an organic photoreceptor is as shown in Fig. 1, and has a photoreceptor drum (hereinafter simply referred to as drum).
As the drum 1 rotates, the static eliminating corotron 2 first removes the static electricity from the drum 1.
Is it completely irradiated on the surface? Eliminates static electricity and charges Corotron 3ζ
A predetermined charge 11m is applied to the surface of the drum 1, and then the document 5 placed on the platen 4 is exposed to the light source 6.
The light ζ from ζ is then irradiated, and the reflected light 7 at this time is reflected by the reflecting mirror 3a.

The light enters the photosensitive drum 1ζ through an optical system composed of a condenser lens 8b and a condenser lens 9I, and forms an electrostatic latent image corresponding to the image information of the original 5 on the surface of the photosensitive drum 1. This electrostatic latent image is visualized by the developing device 10, and the resulting toner image is transferred to the electrically charged sheet material 12 by the transfer corotron 114. Thereafter, the drum 1 after the transfer and the residual toner on the surface of the drum 1 are electrically neutralized by the static eliminating corotron 2, and the residual toner on the surface of the photosensitive drum 1 is further removed by the cleaning device 13. This allows the drum 1 to be used repeatedly. As mentioned above, the copying machine repeats copying from the static elimination process by the static elimination corotron 2 to the cleaning process by the cleaning device 13 as one copy cycle.

By the way, when transferring the toner image formed on the drum 1 to the sheet material 12, the sheet material 12 is conveyed at the same speed as the drum 1, which rotates at a constant circumferential speed, and the leading edge of the sheet material 12 is transferred to the drum 1. , that is, the starting edge of the toner image, and in order to detect the starting edge, a θ point marker I is set.
It is necessary to align the position where M is provided.

For this reason, as a conventional sheet material supply method, the drum
The time required to feed the sheet material 12 from an appropriate position on the sheet material transport path 14 and transport it to the alignment position at a transport speed equal to the circumferential speed of the drum 1 is measured in advance, and the zero inspection of the drum 1 is performed. A first step of conveying the sheet material 12 from an appropriate position on the sheet material conveyance path 14 at a speed equal to the circumferential speed of the drum l when the output marker passes the position where it takes the required time to reach the alignment position. There was a method. With this method, if the normal posture of the sheet material 12, in which both the left and right sides of the sheet material are parallel to the axis of the sheet material transport direction, is distorted, that is, the sheet material 12 is There was a problem in that even if it was tilted with respect to the direction axis, it was not corrected.

Further, until the sheet material 12 reaches the alignment position, the sheet material 12 is conveyed at a speed corresponding to the position of the O point marker IM of the drum l, and at least when the sheet material 12 reaches the alignment position, the sheet material 12 is transported. A second method has been considered in which the material is transported at a speed equal to the peripheral speed ζ of the drum 1. In this second method, the width of the drum 1 and the positioning position! Since the width of each feed roller 15 that brings the sheet material 12 into close contact with the drum 1 is greater than the width of the sheet material 12, a sensor is provided to detect when the sheet material 12 has reached the alignment position. The problem was that I couldn't do it.

(Object of the Invention) The present invention has been made in view of the above-mentioned circumstances, and it corrects the inclination of the sheet material, conveys the sheet material at a circumferential speed of the drum, and moves the sheet material to a predetermined position on the drum. It is an object of the present invention to provide a sheet material supply device that performs alignment.

[Structure of the invention]

Therefore, in the present invention, the circumferential speed of the drum changes as the drum rotates at a constant rotational speed, and the registration roller rotates at the same circumferential speed to convey the sheet material to the placement position of the drum. a nip roller provided oppositely and capable of engaging and disengaging from the registration roller ζ;
A resist finger provided on the conveyance path of the sheet material between the registration roller and the drum to prevent conveyance of the skeleton sheet material; and a first resist finger for detecting that at least the left end and the right end of the sheet material are still in contact with the resist finger. Based on the detection ζ of the detection means and the first detection means, the registration rollers are stopped, the nip rollers are engaged with the registration rollers to nip the sheet material, and further, the blocking of the conveyance of the sheet material by the registration fingers is released. [1 control means, a second detection means disposed near the drum and detecting a predetermined position of the drum, and a nip roller maintenance system based on the detection by the second detection means The second control means rotates the registration roller at a circumferential speed equal to the circumferential speed of the drum to convey the sheet material.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 is a block diagram of a sheet material supply device according to the present invention, and FIG. 3 is a principle diagram of an electrophotographic copying machine equipped with the sheet material supply device. In FIG. 3, the same reference numerals are used for the portions ζ that perform the same functions as in FIG. 1, and detailed explanation thereof will be omitted.

The sheet material supply device according to the present invention includes a registration roller 20 that conveys the sheet material 12 at a speed equal to one circumferential speed of the drum 1, a nip roller 21 that holds the sheet member 12, and
When the a-axis of the sheet material 12 is corrected, one sheet material 12
a resist finger 22 that guides the image in a predetermined direction Iζ, a sheet material detection sensor 23 that detects the sheet material 12, and a sheet material 1
first detection means 2 for detecting that the slope of 2 has been corrected;
4. The second detection means 25 detects the zero point marker IM of the drum 1, and the registration roller 20, the nip row 2-21. and a first control means 26 for controlling the operation of the registration finger 22, and a second control means 26 for controlling the operation of the registration roller 20t and the nip row 2-21 based on the detection output of the second detection means 25.
(See Figure 82).

The registration roller 20 has a width greater than or equal to the width of the sheet material 12, and its rotating shaft is connected to the rotation of a motor 31 that rotates the drum 1 at a constant circumferential speed via a power transmission device [30] consisting of a clutch and a gear. connected to the shaft. Then, the first control means 26 or the second control means 27J
When the clutch of the force transmission device 30 is thus engaged,
It rotates at a circumferential speed appropriate to the circumferential speed of the drum 1, and supplies the sheet material 12 conveyed from the direction of arrow F1 in the direction in which the drum 1 is disposed via the conveyance path 14.

Nip row 5 arranged above the registration roller 20
-21 is attached to one end of the plunger 32 so that it can rotate freely, and when the solenoid 33 is energized by the first control means 26 or the second control means 27, the registration roller 20 is activated as appropriate. When the solenoid 33 is de-energized, the spring 34 is detached from the registration roller 20 by the restoring hook ζ. If the solenoid 33 is energized while the sheet material 12 is being conveyed to this nip o-1-214 by the registration rollers 20, it will not interfere with the conveyance of the sheet material 12, but the registration rollers 2-20 will When the solenoid 33 is energized while it is stopped, the sheet material 12 on the registration roller 20 is clamped.

The sheet material detection sensor 23, which is disposed approximately in the middle position between the registration roller 20 and the drum 1, detects the presence or absence of the sheet material 12 at that position. It is composed of a photosensor. Then, this sheet material detection sensor 23
is the sheet material 12 on the conveyance path 14 below the sensor 23.
When there is no sheet material 12, a signal "1" is output to the first control means 26, and when there is no sheet material 12, a signal "0" is output to the first control means 26.

The resist finger 22 provided in the vicinity of the drum 1 is a substantially inverted member having a width greater than the width of the sheet material 12, and is controlled by the first control means 26 and is controlled by a pulse motor that rotates accordingly. -35 for forward and reverse rotation, correcting the inclination of the sheet material 12, and guiding the sheet material 12 in the direction in which the feed row 5-15 is disposed. Such correction of the inclination of the sheet material 12 is performed as follows. First, the resist finger 22 is raised, and the sheet material 12 conveyed by the resist row 2-20 is placed on the resist finger 22.
2. At this time, if the left side (or right side) of the sheet material 12 is not parallel to the axis in the sheet material conveying direction, that is, if the sheet material 12 is inclined, only the right or left end of the leading end of the sheet material 12 This means that the resist finger Jζ is in contact with the resist finger Jζ. However, since the sheet material 12 cannot advance beyond the resist fingers 22 and is pushed by the resist rollers 20, after an appropriate time has passed, the sheet material 12 will reach the resist fingers at both the left and right ends. 22, and the inclination is corrected. In addition, the sheet material 12
When guiding the sheet material 12 in the direction in which the feed rollers 15 are arranged, the sheet material 12 is conveyed by the registration rollers 20 using the registration fingers 22 as an example.

The first detection means 24 for detecting that both the left and right ends of the sheet material 12 have come into contact with the resist fingers 22 is a pair of sheet material detection sensors 24a provided on the upper left and right sides of the conveyance path 14, respectively.

24b and an AND circuit 24C (see FIG. 2). The sheet material detection sensors 24a and 24b are reflective photosensors like the sheet material detection sensor 23 described above, and when the left end or right end of the sheet material 12 is in contact with the resist finger 22, they output a signal "1".
When they are not in contact, a signal @0'' is output to the AND circuit 240.The AND circuit 24C outputs a signal ``1'' only when the outputs of the sheet material detection sensors 24a and 24b are both 1'' otherwise. sets the signal “0” to the first
output to the control means 26 of.

The second detection means 27 for detecting the zero point marker IM of the drum 1 is a reflective photosensor like the sheet material detection sensor 23, and is disposed at an appropriate position near the drum 1. This appropriate position moves the sheet material from the position where it is in contact with the resist finger 22 to the position where the feed row 9-15 is in contact with the drum 1 at a speed equal to the circumferential speed of the drum 1. The time it takes to transport and the location of the second detection means 27 are
Positioning position ζζ after point detection marker IM passes
This is the position where the time it takes to reach the destination is equal. When the second detection means 27 detects the θ point marker IM, it outputs a signal "1n", and when it does not, it outputs a signal "θ" to the second control means.

Next, the overall operation ζ of the sheet material supplying device according to the present invention will be explained with reference to the operation diagram Q1 shown in FIG.

(1) First, when the copying operation of the copying machine equipped with the sheet material supply device is started and the drum 1 rotates at a constant circumferential speed according to the rotational operation of the motor 22, the first control means 26 controls the power transmission. The clutch of the device 30 is connected to rotate the registration roller 20 at a peripheral speed equal to the peripheral speed of the drum 1, and the solenoid 33 is energized to engage the nip roller 21 with the registration roller 20. As the registration rollers 20 rotate, the sheet material 12 sent out from a sheet material tray (not shown) is conveyed by the registration rollers 20 (see FIG. 4(a)).

(2) The first control means 26 is the sheet material detection sensor 23
When the signal "'1n is output from the sensor 23, that is, when it is detected that the sheet material 12 has passed below the sheet material detection sensor 23, the excitation of the solenoid 33 is released and the nip roller is separated from the registration roller 20 (the first (See Figure 4(b)).

(3) When the first control means 26 outputs the signal "'1" from the first detection means 24, the first control means 26 detects that the left and right ends of the sheet material 12 are connected to the resist finger 221rm.
, J-, and detects that the inclination of the sheet material 12 has been corrected, the clutch of the power transmission device 30 is disconnected to stop the registration roller 21, and the solenoid 33
is excited to move the nip roller 21 to the registration row :)-
20 to sandwich the sheet material 12 (Fig. 4(C)
)reference).

(4) Furthermore, the first control means 26 is a pulse motor.
35 clockwise to rotate the resist finger 2.
2 (see Figure 4(d)).

(5) When the second detecting means 25 outputs the signal "'1," the second control means 27 detects that the zero point marker of the drum 1 has passed below the second detecting means 27. When detected, the solenoid 33 is deenergized to separate the nip roller 21 from the registration roller 21, and the clutch of the power transmission device 30 is connected to rotate the registration roller 20 at a peripheral speed equal to the peripheral speed of the drum 1 (fourth (See figure (e)).By the rotation of the registration roller 20, the sheet material 12 is conveyed at a speed equal to the circumferential speed of the drum 1, and the leading edge of the sheet material 12 is at the alignment position and is aligned with the θ point marker IM of the drum 1. Lightning (Figure 4 (
f)).

〔Effect of the invention〕

As explained above, according to the present invention, the inclination of the sheet material is corrected by the registration fingers, the sheet material of the correction wave is held, and the inclination of the sheet material is adjusted in response to the detection of the zero point marker of the drum. By conveying the sheet material from the corrected position at a circumferential speed l of the drum, the sheet material can be aligned with the zero point marker.

[Brief explanation of drawings]

FIG. 1 is a principle diagram of a general electrophotographic copying machine, FIG. 2 is a block diagram of a sheet material supply device according to the present invention, and FIG. 3 is an electrophotographic copying machine equipped with a sheet material supply device according to the present invention. FIG. 4 is an operation explanatory diagram illustrating the overall operation of the sheet material supply device according to the present invention. 1...Drum, IM...0 point marker, 12...
Sheet material, 15...0 point marker IM and sheet material 12
A feed roller arranged at the alignment position at the tip of the 2
0... Registration roller, 21... Nip roller, 22... Registration finger, 23... Sheet material detection sensor, 24... First detection means, 25... Second detection means, 26.-first control means, 27.. second control means.

Claims (1)

[Claims] A registration roller that rotates at a circumferential speed equal to the circumferential speed of the pattern dome in accordance with the same rotation lζ of the drum that rotates at a constant rotational speed and conveys the sheet material to the placement position of the drum, and a registration roller that faces the registration roller. a nip roller that is provided on the registration roller and can be attached to and detached from the registration roller; a registration finger that is provided in a conveyance path of the sheet material between the registration roller and the drum and that makes it clear that the sheet material is conveyed; and the registration finger. a first detection means for detecting that at least the left end and the right end of the sheet material are still in contact with the sheet material;
The registration roller is stopped based on the detection by the first detection means, the nip roller engages with the registration roller to nip the sheet material, and the sheet material is conveyed by the first registration finger. a first control means for releasing the blocking; a second detection means disposed near the drum and detecting a predetermined position of the drum; and a detection means based on the detection of the second detection means. a second control means for disengaging the nip row 2- and rotating the registration roller at a circumferential speed equal to the circumferential speed of the drum to convey the sheet material. Material supply device.