JPH0237381A - Recorder - Google Patents

Abstract

PURPOSE:To surely strip paper from a contact member without damaging the contact member or disturbing a toner image by providing a peeling means with a vibrating means imparting vibrating energy to a sheet-like recording member in a sheet-like recording member stripping start position. CONSTITUTION:A recording paper 5 closely adhering to the surface of a photosensitive drum 1 after a toner image is transferred is oscillated by the vibrating energy to be vibrated when the paper 5 reaches a position in which the vibrating energy, outputted from the oscillation generator 9 of a recording paper peeling device 11 and propagating in air, acts. Since the leading edge of the recording paper 5 is of free edge, the close adhesion of the photosensitive drum 1 to the recording paper 5 is released to create a slight gap between them. When air enters the gap, the pressure of outside air acting on the recording paper 5 decreases; therefore the adhesion of the recording paper 5 to the photosensitive drum 1 also decreases, and the leading edge of the recording paper 5 separates from the surface of the photosensitive drum 1. Thus, the recording paper 5 can be surely stripped without damaging the contact member or disturbing a toner image.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a recording device, and more specifically, to an improvement in a means for peeling a sheet-like recording medium from a contact member in a conveyance path of the sheet-like recording medium. Regarding.

[Prior Art] In recording devices such as copying machines, computers, and printers used as information output means for communication systems, information images are recorded (copied) on sheet-like recording paper. This sheet-like recording paper is conveyed while coming into contact with various members during the process of recording information. For example, in a copying machine or a laser beam printer using electrophotographic technology, an information image is formed on the surface of a photoconductive photoreceptor, then transferred to recording paper, and then fixed on the recording paper. That is,
A toner obtained by uniformly charging the surface of a rotating photoconductive photoreceptor, exposing the surface of the photoconductive photoreceptor to light in accordance with an information image to be recorded to form a charge latent image, and then developing this charge latent image. The toner image is transferred onto recording paper by a transfer device, and the recording paper onto which the toner image has been transferred is passed through a fixing device to be fixed on the recording paper and output.

By the way, a transfer device transfers a toner image on the surface of a photoconductive photoreceptor to a recording paper by applying a corona electric field from the back side of the recording paper while the recording paper is in contact with the surface of the photoconductive photoreceptor on which a toner image has been formed. Since the recording paper is configured to perform electrostatic transfer, the recording paper is tightly attracted to the surface of the photoconductive photoreceptor by electrostatic force after the transfer, making it difficult to peel off the recording paper. Therefore, the peeling nail is arranged so that the tip of a nail formed of metal or resin (hereinafter referred to as a peeling nail) is inserted between the advancing photoconductive photoreceptor and the recording paper, and the recording paper is sequentially peeled from the tip. Peeling means are provided.

Further, the fixing device has a configuration in which the recording paper is passed between a heat fixing roll consisting of a heating roll and a holding roll, and the recording paper is heated and pressurized to fix the toner image.

Even in this fixing process, the recording paper comes into close contact with the heat fixing roll and tends to be wound around it, so this fixing device is also provided with a peeling means similar to the above.

However, in order to reliably separate the recording paper from the photoconductive photoreceptor or heat fixing roll, it is necessary to place the tip of the separating claw between the surface of the photoconductive photoreceptor or heat fixing roll and the recording paper that is in close contact with the surface. must be inserted into the To do this, it is necessary to slide the tip of the peeling claw onto the surface of the photoconductive photoreceptor or heat fixing roll, which poses a problem of damaging the surface of the photoconductive photoreceptor or heat fixing roll.

For this purpose, as a peeling means, air is blown onto the photoconductive photoreceptor and the recording paper to form a gap between the photoconductive photoreceptor and the leading edge of the recording paper, and then the tip of a nail is inserted into the gap to peel off the recording paper. A method is proposed.

The peeling means in such a recording device is disclosed in Japanese Patent Publication No. 1987-
It is described in JP-A No. 11498, JP-A-58-78180, and JP-A-60-475.

[Problems to be Solved by the Invention] However, when (the leading edge of) the recording paper is in close contact with the surface of the photoconductive photoreceptor or the heat fixing roll, the blown air may damage the photoconductive photoreceptor or the heat fixing roll. It is difficult to penetrate between the surface of the recording paper and the recording paper, and a gap cannot be formed between the surface of the photoconductive photoreceptor or heat fixing roll and the leading edge of the recording paper, which may result in failure to separate the recording paper.

In order to reliably form a gap at the leading edge of the recording paper, the force of air blowing must be strong, which poses the problem of disturbing the toner image in the case of the transfer section.

Therefore, an object of the present invention is to enable a sheet-like recording medium in this type of recording apparatus to be reliably peeled from a contact member in a conveyance path without damaging the contact member or disturbing the toner image. be.

Another object of the present invention is to reliably move the sheet-like recording medium in this type of recording apparatus from the surface of the photoconductive photoreceptor during the conveyance path without damaging the photoconductive photoreceptor or disturbing the toner image. The purpose is to make it removable.

Furthermore, another object of the present invention is to enable a sheet-like recording medium in this type of recording apparatus to be reliably peeled off from the surface of a heat fixing roll of a fixing device in a conveyance path without damaging the heat fixing roller. be.

[Means for Solving the Problems] A first invention includes a conveying means for conveying a sheet-like recording member in contact with the surface thereof, and a peeling means for peeling the sheet-like recording member from the surface of the conveying means. A second invention is characterized in that the peeling means is provided with a vibrating means for applying vibrational energy to the sheet-like recording member at a position where peeling of the sheet-like recording member starts; A recording apparatus comprising: a toner image carrier that conveys the recording paper in contact with a surface of the toner image carrier; and a peeling means that peels off the recording paper to which the toner image has been transferred from the surface of the toner image carrier. A third invention is characterized in that the peeling means is provided with a vibrating means for applying vibrational energy to the recording paper at the recording paper peeling start position. a heat fixing roll that fixes the recording paper;
A recording apparatus comprising a peeling means for peeling off the recording paper on which a toner image is fixed from the heat fixing roller, the recording apparatus further comprising a vibrating means for applying vibrational energy to the recording paper at a position where the recording paper is peeled off to the peeling means. It is characterized by having been established.

[Function] When the recording paper, which is a sheet-like recording member, is in contact with the photoconductive photoreceptor, heat fixing roll, or other contact member in the conveyance path, if the recording paper is attracted to these and adhered to them due to electrostatic force, etc. Since the pressure from the outside air no longer acts on the contact surface of the recording paper, the outside air pressure applied to the non-contact surface also acts as a pressing force on the recording paper. Therefore, the adhesion force of the recording paper to these contact members increases.

However, when the recording paper vibrates, a slight gap is created between the contact member and the recording paper, and outside air flows into the gap, which increases the outside air pressure acting on the contact surface of the recording paper and creates a pressure difference. becomes smaller and the pressing force becomes smaller (disappears).

In the case where the contact member is a cylindrical photoconductive photoreceptor or a heat fixing roll, the recording paper is curved by suction force or pressing force and is brought into close contact with the contact member. However, as described above, when outside air enters between the contact member and the recording paper and the pressing force is reduced, the recording paper is easily separated from the contact member due to its restoring force, its own weight, or the air blown by a small force.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

Example 1 This embodiment is a recording device using electrophotographic technology.

In FIG. 1, a photosensitive drum 1 whose outer peripheral surface has been treated to be photoconductive and photosensitive is supported by a rotating shaft 1a and rotated at a constant speed in the direction of the arrow. The surface of the photosensitive drum 1 is uniformly charged by a charging device 2 and advances to an exposure position by an exposure device 3.

The exposure device 3 exposes the surface of the photosensitive drum with a light beam modulated according to the information image signal in order to form a charge latent image corresponding to the information image to be recorded. The surface of the photosensitive drum 1, on which a charge latent image is formed by this exposure, is developed when passing through a developing device 4, and a toner image is formed.

The recording paper 5 is stored in a paper storage device 6, and in order to transfer the toner image on the surface of the photosensitive drum 1, one sheet is extracted and transported to a transfer position by a transport means 7. During this conveyance, the recording paper 5 is aligned with the toner image on the photosensitive drum 1. The transfer bag @ 8 brings the conveyed recording paper 5 into contact with the surface of the photosensitive drum 1 and then applies a corona electric field for transfer from the back side of the recording paper 5 to transfer the toner image on the photosensitive drum 1 to the surface of the recording paper 5. electrostatically transfer to.

The recording paper separation device 11 is provided at a position to separate the recording paper 5 onto which the toner image has been transferred from the surface of the photosensitive drum 1. The vibration generator 9 generates ultrasonic vibration energy or low-frequency vibration energy for vibrating the recording paper 5 and outputs it toward the surface of the photosensitive drum 1 . The suction device 1o applies a suction force to the back surface of the recording paper 5 to separate the recording paper 5 from the surface of the photosensitive drum 1 and transfer it to the conveying device 12. The conveyance device 12 conveys the recording paper 5 to the fixing device 15 .

The fixing device 15 includes a heating roll 13 and a holding roll 14, and passes the introduced recording paper 5 between the heating roll 13 and the holding roll 14 to melt the toner image and fix it on the recording paper 5. Discharge outside.

According to the recording apparatus described above, the recording paper 5, which is brought into close contact with the surface of the photosensitive drum 1 due to electrostatic force or pressure difference after the toner image transfer, is exposed to vibrational energy output from the vibration generator 9 and propagated in the air. When it reaches the point of action, it is excited by vibrational energy and vibrates. Especially recording paper 5
Since the leading end of the recording paper 5 is a free end, this vibration causes the photosensitive drum 1 and the recording paper 5 to come out of close contact, creating a slight gap between them. When air enters this gap, the pressing force of the outside air acting on the recording paper 5 decreases.
The adhesive force of the recording paper 5 to the photosensitive drum 1 decreases, and the leading edge of the recording paper 5 peels off from the surface of the photosensitive drum 1.

Since the suction device 10 suctions the recording paper 5 in this state, the recording paper 5 can be reliably separated from the surface of the photosensitive drum 1.

Embodiment 2 In the recording apparatus described in Embodiment 1, the heating roll 13 heated to a certain temperature range and the holding roll 14 heated by being pressed against the heating roll 13 are pressed against each other by lowering the pressure to release the recording paper 5. If an attempt is made to prevent the offset phenomenon in which the upper toner image is transferred to the holding roll 14, the shearing force between the heating roll 13 and the holding roll 14 decreases, causing a peeling failure in which the recording paper 5 wraps around the holding roll 14.

In this embodiment, in order to prevent such peeling defects, as shown in FIG. A vibration generator 9 similar to that of the first embodiment is provided in order to apply vibration energy to the position where the vibration is generated.

In this second embodiment as well, when vibration energy acts on the leading edge of the recording paper 5 that has come out in close contact with the holding roll 14, the recording paper 5 vibrates and peels off from the holding roll 14 in the same way as in the case described above. Obtained.

By applying this vibrational energy to the heating roll 13 side, it is possible to obtain the effect of peeling the recording paper 5 from the heating roll 13 when the recording paper 5 comes into close contact with the heating roll 13.

Embodiment 3 In this Embodiment 3, the vibration generator 9 in the recording apparatus of Embodiment 1 is synchronized with the photosensitive drum 1, the charging device 2, the exposure device 3, the developing device 4, and the transfer device 8 in the same direction and with the same phase. It is changed so that it vibrates.

In this third embodiment, the recording paper 5 is vibrated by vibration energy propagated through the photosensitive drum 1, and the recording paper 5 is peeled off from the photosensitive drum 1 in the same manner as in the above case. Moreover, since the charging device 2, exposure device 3, developing device 4, and transfer device 8 also vibrate in the same direction and with the same phase in synchronization with the vibration of the photosensitive drum 1, there is no relative positional deviation between them due to the vibration. No occurrence occurred, and therefore, there was no disturbance in the recorded information image.

Embodiment 4 This embodiment 4 uses the transfer device 8 in the recording apparatus of embodiment 1.
As shown in FIG.
is added.

When the transfer device 8 applies a corona electric field to the back surface of the recording paper 5 in order to transfer the toner image on the photosensitive drum 1 onto the recording paper 5, charges are accumulated on the back surface of the recording paper 5. This charge generates an electrostatic force on the recording paper 5 in the direction in which the recording paper 5 attracts the surface of the photosensitive drum 1 . The charge removing device 17 applies a corona electric field to the back surface of the recording paper 5 to remove (neutralize) the charge on the back surface of the recording paper 5 so that such charges do not remain on the back surface of the recording paper 5 after the toner image is transferred. .

When the electric charge on the back surface of the recording paper 5 is removed in this way, the adhesive force of the recording paper 5 to the photosensitive drum 1 becomes even smaller, so that the recording paper 5 becomes easier to peel off.

On the other hand, if the suction force of the suction device 10 is increased to ensure separation of the recording paper 5 after peeling, the photosensitive drum 1
The recording paper 5 that has been peeled off from the recording paper 5 and sucked by the suction device 10 is attracted (closely attached) to the suction device 10, and a conveyance failure occurs.

However, when the recording paper 5 is vibrated by the vibration energy given by the vibration generator 9, the suction force to the suction device 10 is relaxed, and the poor conveyance caused by the suction is eliminated.

Example 5 In the recording apparatus of Example 1, when the frequency of the vibration energy applied to the recording paper 5 is changed, the peeling efficiency of the recording paper 5 changes. This peeling efficiency is influenced by factors other than frequency, but it has been found that ultrasonic waves or low frequency waves vibrate the recording paper 5 efficiently and increase the peeling efficiency.

Embodiment 6 In the recording apparatus of Embodiment 1, the structure of the vibration generator 9 is changed so that the frequency and intensity of vibration energy change from the upstream part to the downstream part at the recording paper peeling position of the recording paper transport path. The recording paper 5 was controlled so that the leading end of the recording paper 5 was vibrated more strongly, and the peeled recording paper 5 was directed toward the conveying device 12.

By doing so, a better peeling effect was obtained.

Embodiment 7 The recording apparatus of Embodiment 1 is configured such that the vibration energy of the vibration generator 9 can be transmitted to both the photosensitive drum 1 and the recording paper 5, and the vibration energy applied to the photosensitive drum 1 and the vibration energy applied to the recording paper 5 are The phase of is shifted by half a period.

It was found that by doing so, the peeling efficiency was improved.

Embodiment 8 FIGS. 4 and 5 show an example of a vibration generator 9 that generates vibration energy by sucking and discharging air around the peeling position. This vibration generator 9 is suitable for use in peeling the recording paper 5 from the surface of the photosensitive drum 1.

The vibration generator 9 shown in FIG. 4 has a plurality of intake ports 18 and exhaust ports 19 arranged alternately in the direction of the rotation axis of the photosensitive drum 1.

The vibration generator 9 in FIG. 5 has a plurality of rows of intake ports 18a and a row of intake ports 18b arranged in the direction of the rotation axis of the photosensitive drum 1, and a plurality of exhaust ports 19 between these two rows. It has a column of .

And these intake ports 18 (18a, 18b)
The air around the separation position is sucked and exhausted by the exhaust port 19 to generate an oscillating flow of air at the position.

Example 9 In the vibration generator 9 of Example 8 shown in FIGS. 4 and 5, the intake ports 18 (18a, 18b) and the exhaust ports 19 are used without distinction between intake and exhaust, and all of them are used at the same time. It is used for intake or exhaust to suck in and exhaust air around the separation position to generate an oscillating flow of air at the position.

This vibration generator 9 also extends from the surface of the photosensitive drum 1 to the recording paper 5.
Suitable to use for exfoliating.

Embodiment 10 FIG. 6 shows an example of a vibration generator 9 that vibrates the air around the peeling position using an electrostrictive or magnetostrictive vibrator. The vibration generator 9 generates vibrations for peeling the recording paper 5 from the surface of the photosensitive drum 1 and the heating roll 1 of the fixing device 15.
3 or for generating vibrations for peeling the recording paper 5 from the holding roll 14.

A plurality of vibrators 20 are arranged in the direction of the rotation axis of the photosensitive drum 1, and are vibrated by being supplied with an electric signal of a predetermined frequency.

When the vibrators 20 are divided in the direction of the rotational axis in this way, the distribution of vibration energy applied to the recording paper 5 can be arbitrarily changed by adjusting the vibrating force of each vibrator 20, and the peeling efficiency is high. Moreover, it can be kept in a stable state.

Embodiment 11 The vibration generator 9 shown in FIG. 7 is obtained by changing the arrangement of the vibrators of Embodiment 10 shown in FIG.

A plurality of vibrators 2 arranged in the direction of the rotation axis of the photosensitive drum 1
The rows of 0a, 20b, 20c are provided shifted in the rotation direction,
Each row of vibrators 20a, 20b, and 20c is excited by an ultrasonic frequency or low frequency power supply device 21.

The power supply device 21 includes each vibrator 20a, 20b.

The column 20c is excited and controlled so that the frequency and intensity of the vibration energy change from the upstream part to the downstream part at the recording paper peeling position of the recording paper transport path, and the recording paper 5
The farther the tip of the recording paper 5 vibrates, the more the peeled recording paper 5 is directed toward the conveying device 12.

By doing so, a better peeling effect was obtained.

Embodiment 12 FIG. 8 shows an improvement of the vibrator 20 in the vibration generator 9 shown in the 10th and 11th embodiments.

The propagation control member 22 controls the propagation direction of the generated vibration energy and prevents the vibrations generated in each vibrator 20 from interfering with each other.

As described above, the recording apparatus according to the present invention includes a vibration device inside thereof, and when this vibration energy leaks to the outside, noise is generated. Therefore, it is desirable that the housing of the recording device be subjected to vibration-proofing processing to prevent vibration energy from leaking to the outside.

Since this recording apparatus can record information images over the entire area of the recording paper 5, it has been used with great effect as information image output means in computer systems and facsimile systems.

[Effects of the Invention] As described above, the present invention applies vibrational energy to recording paper, which is a sheet-like recording member, that is in contact with (in close contact with) a photoconductive photoreceptor, a heat fixing roll, or other contact members in a conveyance path. A slight gap is created between the contact member and the recording paper, allowing outside air to flow into the gap, thereby increasing the outside air pressure acting on the contact surface of the recording paper and reducing the pressure difference. Pressure force decreases (disappears)
As a result, the recording paper can be easily peeled off from the contact member by its restoring force, its own weight, or by air blowing with a small force, and therefore, the sheet-shaped recording medium in the recording device is easily separated from the contact member by the photoconductive photosensitive material in the conveyance path. It has the effect of being able to be reliably removed from a contact member such as a body or a heat fixing roll without damaging the contact member or disturbing the toner image.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, in which Figure 1 is a vertical sectional side view showing the entire recording device using electrophotographic technology, and Figure 2 is a longitudinal side view showing the entire recording device using electrophotographic technology.
The figure is a vertical side view of the fixing device, Figure 3 is a vertical side view of the recording paper separation section, Figures 4 to 7 are perspective views or side views showing the arrangement of the vibration generator, and Figure 8 is the vibration generator. It is a vertical side view of a container. 1... Photosensitive drum, 2... Charger, 3... Exposure device, 4... Developing device, 5... Recording paper, 8...
Transfer device, 9... Vibration generator, 11...
... Recording paper peeling device, 13 ... Heating roll, 14 ... Holding roll, 15 ...
Fusing device. No. 1 drum llp Takutoshi! Dew point rtL Reply J! Recording abrasive boat storage 2 Miscellaneous 1 first thorn 1 1 diagram transcription vcl! R, Rikibagsei 2 Paper embroidery for customers 1L L-Trolley) Cow roll fixing device articulator

Claims (1)

[Scope of Claims] 1. A recording apparatus comprising: a conveyance means for conveying a sheet-like recording member in contact with the surface thereof; and a peeling means for peeling the sheet-like recording member from the surface of the conveyance means, A recording apparatus characterized in that the peeling means is provided with a vibrating means for applying vibrational energy to the sheet-like recording member at a position at which peeling of the sheet-like recording member starts. 2. In claim 1, the vibration excitation means:
A recording device characterized in that vibration energy is transmitted to the sheet-like recording member by vibrating gas around a sheet-like recording member peeling start position. 3. In claim 1, the vibration excitation means:
A recording apparatus characterized in that vibration energy is transmitted to the sheet-like recording member by vibrating the conveying means. 4. A recording apparatus according to claim 1, 2, or 3, wherein the vibration excitation means generates ultrasonic vibration energy. 5. A recording apparatus according to claim 1, 2, or 3, wherein the vibration excitation means generates low-frequency vibration energy. 6. Claims 1 or 2 or 3 or 4 or 5, wherein the peeling means further peels the plate-like recording member at a peeling start position of the sheet-like recording member. A recording device characterized by comprising an airflow generating means for applying an airflow. 7. A toner image carrier that conveys a recording sheet while bringing it into contact with the surface on which the toner image is formed, and a peeling means that peels off the recording sheet to which the toner image has been transferred from the surface of the toner image carrier. 1. A recording apparatus comprising: a vibrating means for applying vibrational energy to the recording paper at the recording paper peeling start position in the peeling means. 8. In claim 7, the vibration excitation means:
A recording apparatus characterized in that vibration energy is transmitted to the recording paper by vibrating gas around a recording paper peeling start position. 9. In claim 7, the vibration excitation means:
A recording apparatus characterized in that the toner image carrier is vibrated to transmit vibrational energy to the recording paper. 10. A recording apparatus according to claim 7, 8, or 9, wherein the vibration excitation means generates ultrasonic vibration energy. 11. A recording apparatus according to claim 7, 8, or 9, wherein the vibration excitation means generates low-frequency vibration energy. 12. Claims 7 or 8 or 9 or 10 or 11, wherein the peeling means further applies a peeling airflow to the recording paper at the recording paper peeling start position. A recording device characterized by being equipped with an airflow generating means. 13. A rotating photoconductive photoreceptor, a latent image forming means for forming a latent charge image on the surface of the photoconductive photoreceptor, and a developing means for developing the latent charge image on the surface of the photoconductive photoreceptor to form a toner image. a transfer means for transferring the toner image onto the recording paper by bringing a recording paper into contact with the surface of the photoconductive photoreceptor on which the toner image has been formed; and peeling off the recording paper on which the toner image has been transferred from the surface of the photoconductive photoreceptor. 1. A recording apparatus comprising: a peeling means, wherein the peeling means is provided with a vibrating means for applying vibrational energy to the recording paper at the recording paper peeling start position. 14. The recording apparatus according to claim 13, wherein the vibrating means vibrates gas around a recording paper peeling start position to transmit vibrational energy to the recording paper. 15. The recording apparatus according to claim 13, wherein the vibrating means vibrates the photoconductive photoreceptor around the recording paper peeling start position to transmit vibrational energy to the recording paper. 16. A recording device according to claim 13, 14, or 15, wherein the vibration excitation means generates ultrasonic vibration energy. 17. A recording apparatus according to claim 13, 14, or 15, wherein the vibration excitation means generates low-frequency vibration energy. 18. In claim 13, 14, 15, 16, or 17, the peeling means further applies a peeling airflow to the recording paper at the recording paper peeling start position. A recording device characterized by being equipped with an airflow generating means. 19. A thermal fixing roll that fixes the toner image on the recording paper by passing the recording paper on which the toner image is formed, and a peeling means that peels off the recording paper on which the toner image is fixed from the heat fixing roller. 1. A recording apparatus characterized in that said peeling means is provided with a vibrating means for applying vibrational energy to said recording paper at said recording paper peeling start position. 20. The recording apparatus according to claim 19, wherein the vibrating means vibrates gas around a recording paper peeling start position to transmit vibrational energy to the recording paper. 21. The recording apparatus according to claim 19, wherein the vibrating means vibrates the heat fixing roll to transmit vibrational energy to the recording paper. 22. A recording device according to claim 19, 20, or 21, wherein the vibration excitation means generates ultrasonic vibration energy. 23. A recording apparatus according to claim 19, 20, or 21, wherein the vibration excitation means generates low-frequency vibration energy. 24. Claims 19 or 20 or 21 or 22 or 23, wherein the peeling means further applies a peeling airflow to the recording paper at the recording paper peeling start position. A recording device characterized by being equipped with an airflow generating means.