JPH043317Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a device for transferring an image visualized by toner onto a recording paper in a transfer type printing device and then peeling off the recording paper from a recording medium. It is something.

PRIOR ART Many types of conventional transfer paper peeling devices have been put into practical use in electronic copying machines, etc. However, in the method of using a belt to peel the recording paper from the recording medium, toner adheres to the belt and Because of this, the recording paper sometimes got dirty. In order to prevent this, a cleaning member such as felt is brought into contact with the belt to remove the toner adhering to the belt. However, this belt cleaning member eventually became contaminated with toner and had to be replaced. This was not a problem in relatively low-speed copiers because they were not replaced frequently, but if this device was used in devices that make a large number of copies, such as ultra-high-speed copiers, the cleaning member would have to be replaced extremely frequently. There was a problem.

Therefore, in order to solve the problems of the prior art, the present inventors produced a laboratory prototype device as shown in FIG. 1 and attempted to improve it. That is, as shown in FIG. 1, the developing device was arranged so as not to supply toner to the position where the peeling belt contacts the recording medium. In other words, the toner is prevented from coming into contact with the magnetic drum 1 in the area above the two-dot chain line in FIG. 1 where the peeling belt 3 is located. Therefore, this part was designated as an area in which no image was recorded. However, with this arrangement, it was found that the following problems occurred. The toner and paper powder mix and adhere to the area where the toner is developed during transfer, so when cleaning the surface of the magnetic drum 1 (recording medium) with a cleaning blade, both the cleaning blade and the recording medium will not be damaged and will last a long time. However, the part of the recording medium 1 that is in direct contact with the diagonally shaded part of the recording paper 6 has only paper dust from the recording paper attached to it and no toner, so this part is the part of the cleaning blade that is in direct contact with the recording paper 6. During cleaning, the cleaning blade and recording medium were sometimes locally worn. In particular, this phenomenon appears when the number of copies increases. The reason for this is thought to be that the toner acts as a lubricant, and in the case of only paper dust, the paper dust acts as an abrasive.

Purpose of the invention The present invention was made to solve the problems of the prior art as described above, and its first purpose is to
It is an object of the present invention to eliminate the need for a belt cleaning member in a transfer paper separation device that uses a separation belt to separate a recording paper from a recording medium. The second purpose is to prevent local wear of the cleaning blade and recording medium that would otherwise occur due to the adoption of this mechanism.

Structure of the Invention In order to achieve the above object, the present invention has a structure in which a peeling belt and a transfer roller hold one side edge of a recording sheet and peel it from the recording medium, and the surface of the recording medium is cleaned by a cleaning blade. In a transfer paper peeling device of a transfer type printing device to be cleaned, a developing device is arranged so as not to supply toner to a position where the peeling belt contacts the recording medium, and one side edge of the recording paper to be peeled is attached to the peeling belt. The peeling belt is arranged so as to be on an extension of one side edge of the recording paper so that the one side edge of the recording paper does not come into direct contact with the recording medium during transfer. That is.

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

FIG. 2 shows the entire inside of a magnetic printing apparatus equipped with an embodiment of the present invention, and the structure and operation thereof will be briefly explained. First, the magnetic drum 1, which is a recording medium, rotates and the erasing head 13 operates. After the old latent image is erased, the cleaning blade 14 separates from the magnetic drum 1, and the magnetic drum 1 rotates at high speed (for example, 4000 rpm) in the direction of the arrow, and the magnetic latent image is recorded on the magnetic drum 1 by the recording head 2. . When the latent image recording is completed, the magnetic drum 1 moves at the copying speed (for example, 100 r.p.
m), and after the cleaning blade 14 contacts the magnetic drum 1, it is developed with the magnetic toner 24 by the developing device 12 which is brought close to a predetermined position.

The recording paper 6 on the paper feed table 7 or 8 is fed by the paper feed roller 2.
1 or 22, and is fed out by timing rollers 9a, 9b or 10a, 10b so as to match the image position on magnetic drum 1, and is fed out between transfer roller 5 and magnetic drum 1 by paper feed rollers 28a, 28b. sent. The solenoid 11 is energized so that the transfer roller 5 presses the recording paper 6 against the magnetic drum 1 when the leading edge of the recording paper 6 reaches the transfer position. The toner image on the magnetic drum 1 is transferred to a recording paper 6, and one end of the recording paper 6 is transferred to fixing rollers 17a and 1 by a conveyor belt 16.
The fixed recording paper 6 guided between fixing rollers 17a and 17b by peeling claws 18a and 18b
b, and is discharged to the paper discharge tray 20 by the paper discharge rollers 19a, 19b. Toner remaining on the magnetic drum 1 without being transferred is scraped off by a cleaning blade 14, vacuum-suctioned by a cleaning section 15, and collected in a filter box (not shown).

3, 4, and 5 show the detailed structure of the peeling device according to the embodiment of the present invention, and show the endless peeling belt 3.
are seven pulleys 4a, 4b, 4c, 4d, 4e,
4f, 4g and the transfer roller 5 to form a closed loop. The first pulley 4a is attached to a slider 27 and movably supported on a slide table 26, and applies tension to the peeling belt 3 by a spring 25. Further, the first pulley 4a is arranged so that its axial direction is perpendicular to the axial direction of the transfer roller 5.

A fourth pulley 4d is disposed at the farthest position on the opposite side of the first pulley 4a with respect to the transfer roller 5, and the axial direction of the fourth pulley 4d is perpendicular to the axial direction of the transfer roller 5. located so that
An endless peeling belt 3 is provided between the first pulley 4a and the fourth pulley 4d, and the second pulley 4b,
It is stretched across the transfer roller 5, the third pulley 4c, the fifth pulley 4e, the sixth pulley 4f, and the seventh pulley 4g. The second pulley 4b and the third pulley 4c have respective axial directions parallel to the axial direction of the transfer roller 5, and are disposed on both sides of the transfer roller 5 with the transfer roller 5 in between. Further, the fifth pulley 4e is disposed coaxially with the third pulley 4c and is located at a symmetrical position with respect to the fourth pulley 4d in plan view (FIG. 5). It is disposed coaxially with the pulley 4b and is located at a symmetrical position with respect to the first pulley 4a in plan view. Furthermore, the sixth pulley 4f is disposed coaxially with the transfer roller 5 and close to its outer end, and is located between the fifth pulley 4e and the seventh pulley 4g.

Therefore, the peeling belt 3 is connected to the first pulley 4a.
and the second pulley 4b, between the third pulley 4c and the fourth pulley 4d, and between the fourth pulley 4d and the fifth pulley 4b.
between the seventh pulley 4e and the seventh pulley 4g and the first
and the first pulley 4a, and the first
The direction is changed between the pulley 4a and the fourth pulley 4d.

Furthermore, as shown in FIG. 3, the peeling belt 3 is arranged so as to match the position of the recording paper 6 on the paper feed table 7 or 8 and to be located on an extension of the side edge of the recording paper 6. so as to cover the entire area of the recording paper 6 in which an image cannot be recorded.

In this embodiment with the above configuration, when recording a latent image, the transfer roller 5 is stationary apart from the magnetic drum 1 at the position indicated by the one-dot chain line in FIG. 4, so the peeling belt 3 is also separated from the magnetic drum 1. and stationary. Therefore, even if the magnetic drum 1 rotates at high speed (for example, 4000 rpm) at this time, the peeling belt 3 is not affected at all.

Further, when recording a latent image, the recording head 2 is moved so that the peeling belt 3 is attached to the magnetic drum 1, as shown in FIG.
Therefore, when scanning, it is possible to start scanning from a position close to the outer edge of the magnetic drum 1 so as to enable recording from a position shown by a two-dot chain line in FIG. can.

When the latent image recording is completed and the magnetic drum 1 reaches the copying speed (for example, 100 rpm), the transfer roller 5 is pressed against the magnetic drum 1 in line with the leading edge of the recording paper 6, and the transfer roller 5 pinches the recording paper 6. Rotate.
At this time, the peeling belt 3 also rotates together with the transfer roller 5, and the side edge of the recording paper 6 is held between the peeling belt 3 and the transfer roller 5, and the entire area of the recording paper 6 where no image can be recorded is transferred to the peeling belt 3. While peeling it from the magnetic drum 1 while covering it with the second pulley 4b.
The direction is changed by the first pulley 4a, and the seventh pulley 4g, sixth pulley 4f,
After passing through the fifth pulley 4e, the direction is changed again at the fourth pulley 4d, and the sheet is returned to the transfer roller 5 through the third pulley 4c.

The magnetic toner 24 is indicated by a two-dot chain line 25 in FIG.
It comes into contact with the magnetic drum 1 at a lower part. Therefore, the magnetic toner 24 does not come into contact with the portion of the magnetic drum 1 that is in contact with the peeling belt 3 in the region above the two-dot chain line 25.

Further, as shown in FIG. 3, a recording paper positioning device 35 is provided above the paper feed tray 7, and the recording paper 6
is placed with its upper edge 61 abutting against it. The position of the recording paper positioning device 35 is such that the upper edge 61 of the recording paper 6 is completely covered by the peeling belt 3. In other words, the peeling belt 3 is positioned on an extension of the upper edge 61 of the recording paper 6.

Therefore, since the recording paper 6 does not come into direct contact with the recording drum 1 in the area of the magnetic drum 1 above the two-dot chain line 25, paper dust does not accumulate on the blade 14 or the magnetic drum 1. In the area below the two-dot chain line 25, the recording paper 6 comes into contact with the magnetic drum 1, so paper dust accumulates here, but at the same time, the magnetic toner 24 also comes into contact with the magnetic drum 1, so the blade 1
The toner 24 and paper powder are mixed and accumulated in the magnetic drum 4, so that even if the magnetic drum 1 is cleaned with the blade 14, they will not be worn out.

Effects of the invention As explained above, this invention prevents the toner from coming into contact with the part of the recording medium that comes into contact with the peeling belt, and transfers the toner with the side edges of the recording paper covered by the peeling belt. Since the recording paper does not come into direct contact with areas where toner does not adhere, there is no need for a cleaning member for the belt, and only paper dust that does not contain toner is prevented from accumulating on the cleaning blade, etc. This has the effect of preventing local wear and tear on the cleaning blade and the recording medium.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a partially improved recording paper peeling system, FIG. 2 is a schematic diagram of the overall configuration of a magnetic printing apparatus equipped with an embodiment of the present invention, and FIG. 3 is a plan view of an embodiment of the present invention. Plan view, Figure 4 is the same plan view, Figure 5 is the same as above.
It is an enlarged partial view of the figure. 1... Recording drum, 2... Recording head, 3...
Peeling belt, 4a to 4g... Pulley, 5... Transfer roller, 6... Recording paper, 61... Recording paper side edge, 7
...Paper feed tray, 35...Positioning device.

Claims (1)

[Scope of utility model registration request] In a transfer paper peeling device of a transfer type printing device in which one side edge of a recording paper is sandwiched between a peeling belt and a transfer roller and peeled from a recording medium, and the surface of the recording medium is cleaned by a cleaning blade, the peeling belt is used to remove the recording paper from the recording medium. A developing device is arranged so as not to supply toner at a position in contact with the medium, and the position of the peeling belt is set as an extension of one side edge of the recording paper so that the peeling belt covers one side edge of the recording paper to be peeled off. A transfer paper peeling device characterized in that the transfer paper peeling device is arranged so that one side edge of the recording paper does not come into direct contact with the recording medium during transfer.