JPS6090373A - Sheet separating device of electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To peel off exactly a sheet from a photosensitive body, and to remove easily a jammed sheet by oscillating a tension pulley by interlocking with an operation of a cover of a fixing part, and loosening a tension of a belt and a press-contacting force to a guide roller. CONSTITUTION:A sheet S which has ended a transfer process is placed on a peeling piece 31 and peeled off from a photosensitive body 1, guided by the piece 31 and led between an end part 25 of a turn roller 21 and an endless belt 43, and the further advancing sheet S is inserted and held by a sheet guide roller 26 and the belt 43 again and fed to the following fixing device. In case a jam is generated in a fixing part, a tension pulley 37 is oscillated by removing its cover, a tension of the belt 43 is loosened, also a pressure pulley 38 is separated from the roller 26, and the inserting and holding force to the sheet S is set free. Accordingly, the sheet S is peeled off exactly from the photosensitive body 1, and as for the jam, the sheet can be fetched and removed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an electronic copying machine, in which an image formed on a tram-shaped photoreceptor is transferred to a sheet brought into contact with the photoreceptor to obtain a copied image. This invention relates to a seal separating device for a so-called transfer type electronic copying machine.

In a transfer type electronic copying machine, sheet 1 immediately after the transfer process
Since ~ is in close contact with the photoreceptor, it must be separated from the photoreceptor in order to be sent to the next process. Various methods and devices have been proposed in the past for separating sheets to which images have been transferred.

It is desirable that the mechanism be as simple as possible.

One way to reliably separate sheets is to use the side edges of the sheet to separate it from the body.

Conventionally, there are devices that use the ) - method, such as those that use a relatively long wooden bell 1 and those that use two bells [. It has the disadvantage of being easy to raise and having poor exchangeability, and although the latter has the advantage of being able to lengthen the restraint hole 1111t for sea 1- immediately after separation, once trouble occurs, it is troublesome to repair or replace bell 1. There are disadvantages.

The present invention eliminates the above-mentioned disadvantages and shortcomings, and also enables reliable separation into sheets 1 even when rapid rotation of the transfer paper is required in the separation process, or even when the number of sheets is quite 17. 11, which has good separation performance during conveyance, and even if trouble occurs with paper jar 11, etc., part 1'
is held between the devices. II. Seat 1 that can be taken out and removed very easily by loosening the binding force on the sheet.
The present invention will now be described with reference to the illustrated embodiment (94).

First, in FIG. 1, C1~'y)@' of the present invention
! An example of an electronic III photocopying machine using a Q position and the processes before and after the separation process will be briefly explained. In the figure, reference numeral 1 indicates a drum-shaped IG body (hereinafter referred to as "photosensitive drum") that rotates in the direction of the arrow. A toner image is formed on the surface of the photosensitive drum 1 via a charging device S'i Ui (not shown), an exposure device, and a developing device.

When the portion of the photoreceptor drum 1 on which the toner image is formed rotates to the transfer section, a transfer paper (hereinafter referred to as a "sheet") fed in synchronization with this rotation comes into contact with the photoreceptor tram. Then, the image is transferred to the sheet by the transfer device 2. When this photoconductor tram comes into contact with I, the sea 1-
The negative side edge of the drum 1 projects outward from the end of the drum 1 by about 5 to 7 mm.

After the transfer process, the sheet 1- is in close contact with the surface of the photoreceptor 1-ram 1, but this sheet is separated by the sheet separation device M3 and sent to the fixing device 4, which is the next process. It will be done.

The fixing device 4 includes an endless belt 7 that is passed around a pair of belt rollers 5 and 6, a heater 8 that heats the sheet from the back side of the belt via this belt, and a belt 1-7 attached to the roller 5.
It consists of a pressure roller 9 that presses the rollers, a box 10 that surrounds them, and a support shaft 11a to form a fixing device, or in other words, a cover U that can be opened and closed with respect to the main body of the copying machine.

The sheets 1 to 1 fed into the fixing device 4 have the transferred images fixed thereon, and then are discharged to the outside of the copying machine by a pair of delivery rollers 12. In addition, in the figure, the dashed-dotted line shows the path of the sheet.

Now, the configuration of the separation device 3 will be explained in detail with reference to FIGS. 2 and 3. The immovable side plate of the copying machine body → 20 (one side is shown) has a 1° angle as shown in No. 31 1.

A turn roller 21 disposed close to the photoreceptor drum lz I is rotatably supported by its support shaft 22 .

A shaft 22 of the turn roller 21 is fixedly attached to the shaft 22, and is rotated in the direction of the arrow JJ by a driving center 24.

The end portion 25 of the turn roller 21 is
1, and the peripheral surface of the protruding portion is formed of a material having a large coefficient of friction, such as the gong 11. In the traveling direction of the sheet separated from the photoreceptor drum (see FIG. 1), a sheet guide roller 26 formed of a material with a large coefficient of friction in the same way as the end portion 25 is disposed in the direction of the turn roller 21. It is arranged. The seat roller 26 is rotatably mounted on a support shaft 30 which is equivalent to the end of the first hanging arm 29a of the base plate 29 fixed to the side plate 20 with studs 27 and 28.

The lower end of the second hanging 1I5i129b of the substrate 29 is connected to the second U
4, the sheet is bent and extends to the vicinity of the end 1a of the photoreceptor drum 1 to form a sheet peeling piece 31. This peeling J~31 is as shown in FIG.

The photoreceptor drum 1 is arranged in such a manner that it slightly protrudes from the circumferential surface of the photoreceptor drum 1 .

A support shaft 32 is attached to the second arm 11 @ 29b, and a tension lever 33 is rotatably attached to the base of the support shaft 32, and a first belt pulley 34 is rotatably attached to the tip thereof. ing. The tension lever 33 has
・The other end is locked to the folded part of the lever, and the elasticity of the helical spring 35 wound around the support shaft 32 causes the rotation around the support shaft 32; It has a tendency to swing in one direction.

A second belt pulley 37 with a flange is rotatably attached to the tension lever 33 by a support shaft 36, and applies tension to the endless bell 1-, which will be described later. below,
The second belt pulley 37 is called a chin-jo pulley.

Further, the free end of the same lever 33 is bent toward the side plate 20 in the axial direction, and then further bent toward the side plate 20 in the axial direction.
A release lever 33a is formed.

A third belt pulley 38 is arranged above the sea 1 to kite roller 26.
J-38 is oscillated by the shaft 39 on the board 29! The pressure lever 40 is rotatably attached to one end of the pressure lever 40, which is pivotably mounted on the FIJ. The other ends of the locking pieces 29c formed on the side edges were locked to the bent portions of the first rib, and the shaft 34 was wound around the shaft 34. Due to the elasticity of the spring 42, when a! In the second eye/2I), the oscillating habit is established. In this case, the second belt pulley 38 has the same orientation as the seat kite roller. Henceforth, this third bell 1
- The pulley is called a pressure pulley.

The first belt pulley 34, the tension pulley 37, and the pressure pulley 38 are covered with, for example, an endless bell I.43 made of polyester film. As shown in FIG. 3, the extending portion of the endless belt 43 between the first belt pulley 34 and the pressure pulley 38 is connected to the circumferential surface of the end 25 of the turn roller 21 (see FIG. 2). Partially pressed. In addition, sea 1 ~ car r troller -
26, an endless bell I.43 is pressed against it by a pressure pulley 38 having a swinging habit.

Tension is applied to the endless belt 4:3 by the action of the tension pulley 37. Due to the second tension, the pressure lever 40, which is the support member of the pressure pulley 38,
A force in the direction of rotation acts, but since the shaft 39, which is the pivot center of the lever, is located at -1°C from the line connecting the shaft 36 and the lever, the spring 120 action is applied. As a result, the endless belt 43 is swung in a direction in which it is pressed against the sheet kite roller 26. When replacing the endless belt 43 or inspecting only the separation device, the tension on the belt is released by pushing the release lever 33a by hand.

The other end of the pressure lever 40 extends below the tension lever 3:3, and its bent piece 10a is located on the swinging locus of the lever.

A tension release link 44 is slidably attached to the side plate 20, and a guide pin 45 is fitted into a long hole 44a formed in the side plate 20. The end of the connecting rod 44 is bent and extends, and has an operating portion 44h that engages with the release lever 33a of the tension lever 33. on the other hand,
As shown in FIG. 5, the other end of the connecting rod 41 is attached to a swing arm 46 which is swingably attached to the side plate 20 with screws 47.
is connected to. , the pushing arm 46 of this rocking arm 46
A extends toward the front in FIG. 5, and is positioned within the rotation locus of the back surface 11II when the cover 11 of the fixing device 4 is rotated and opened as shown by the chain line. Then, the connecting rod 44 is a passage, as shown in FIG.
Tension lever 3:! Due to its rocking behavior, it is slid to the left and positioned 1).

In addition, in the figure, the reference numeral 48 indicates a sheet guide plate.

In the sheet separating device 3 configured as described above, as shown in FIG. 3, the sheet S that has completed the transfer process is brought into close contact with the surface of the photoreceptor 1:ram 1 and is moved in the direction of the arrow. When the sheet is separated, the side edges of the sheet protruding from the photoreceptor drum 1 (see FIG. 2) sit up on the peeling piece 31, and
The I crumb 1 is peeled off. The sheet S, which advances as the photosensitive drum 1 rotates, is guided by the peeling piece 31 and guided between the end 25 of the turn roller 21 and the endless belt 43.

Seat 1-S, which is held between the end portion 25 and the endless belt 43 by sandwiching the side edge Sa (see Fig. 2), is in close contact with fm.
The photoreceptor is separated from the surface of the photoreceptor I and rotated. The length of this constraint is between the symbol MN in FIG.

After the sheet advances without being restrained, it is again held between the sheet kite roller 26 and the endless belt 43 and restrained, and then sent toward the next fixing device 4.

The locus of the both side edges of the sheet S separated from the photoconductor tram l will be explained with reference to FIG. 6. If the restraint length of one side edge of the sheet is between MN and MN, the sheet will no longer be restrained.
For example, the locus drawn by the unrestricted edge at the 0 point becomes a large circular arc due to the stiffness, so-called stiffness, unique to the seat, as shown by reference numerals 1 and 3. However, at point 0, the locus of the unrestricted edge by the separating device 3, which again clamps and restrains the side edge, becomes a relatively small circular arc, as indicated by the symbol T2. Note that the symbol T1 represents the locus of the restraining edge that is held at the zero point.

As can be understood from FIG. 6, when the length of the restraint on the sheet 1- separated from the photoreceptor drum lzl is short, the unrestricted edge draws a large arc due to the strength of the waist of the sheet. This may cause the sheet to get stuck in the cover 11 of the constant γ1 device r'-t4, or the sheet may run skewed and cause wrinkles on the fixing roller. Since the seat is fixed to the turn roller 21 and restrained to the point where the strength of the rolling seat is lost, the arc of the unrestricted edge can be made small, and the problem of wrinkles due to binding or skewing of the seat 1 does not occur. Sheet separation is performed.

By the way, in a copying machine, a paper jam may occur due to a sheet getting stuck in a path. If this paper jam occurs in the fixing device, there is a risk that the sheet will burn if it is not removed immediately. Also, paper jam is
It is a fixing device (although it does not occur in the printer, it is
In the separation device, when a problem with separation occurs,
When the member that can be opened and closed is opened on the main body of the copying machine, the restraining force on the sheet is loosened and the sheet 1-
If a paper jam occurs in the fixing section in the state shown in FIG. 3, the fixing device 4
As shown in FIG. 1, the cover II is swung in the direction of the arrow to expose the inside of the fixing device. When the cover 11 swings, its back portion 11b rotates the swing lever 46 in the o'clock direction 81, as shown in FIG.

When the swing lever 46 rotates, the connecting rod 4 connected to it
4 is slid in the direction of arrow a. As the connecting rod 44 slides, its actuating portion 441) pushes the release lever 3311 and swings the tension lever 33 clockwise about the support shaft 32 against the elasticity of the spring 35. As a result, the tension pulley 37 is swung, and the tension of the endless bell 1-43 tensioned thereon is loosened.

Further, when the tension lever 33 swings, the lower edge 33b of the free end is bent by the bent piece jlO at one end of the pressure lever 40.
a, the lever 4o is swung counterclockwise in the n1 direction l\ against the elasticity of the spring 42, and the pressure pulley 38 attached to the other end of the lever 4o is separated from the seat 1 to the guide roller 26. move in the direction.

When the tension pulley 37 and the pressure pulley 38 are oscillated and the tension on the endless belt is released, the tension on the endless belt is released.
Since the pressure contact with the r troller 26 is also released and the sheet is removed from the roller 11, even if a portion of the sheet still remains in the separating device 3, the sheet is completely free from being held, and the sheet can be easily removed. 7+9, the belt pulley 32 and the end 25 are set so that there is still a slight gap even if the endless bell l-43 is interposed, so that even if there is a jam, the sheet will not fit into the pulley. 32 end 2
5 will not press and hold A.

According to the present invention: If a paper jam occurs due to force near the seal separation device, for example, when the cover 1.1 of the fixing device is opened, the tension on the belt is released. Therefore, even if the fixing section is left to the separating section to cause a jam.

Sheet removal can be carried out very easily and quickly without having to operate a separate device. .

Shi-o, relax your tension against Endless Bell 1-.

One end of the connecting rod 4.1 that swings the release lever 3; 1a is
Illustrated fruit 7ji! In the i example, it was connected to the cover 11 of the constant X1 device rR/I, but it is not limited to the constant
Is the separation device external? +7. Of course, it may be arranged in a round shape on the main body of the copying machine and connected to a cover etc. that can be opened and closed.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing only the essential parts of an example of an electronic copying machine using the sheet separating device of the present invention, FIG. 2 is a plan view showing an embodiment of the present invention, and FIG. FIG. 4 is a diagram showing the same operation, FIG. 5 is a perspective view showing only the essential parts, and FIG. 6 is a diagram showing the locus of the side edge of the sheet immediately after separation. 1... Photosensitive drum 11. 21... Turn roller, 26... Roller to sea 1 to chi 1; 11
... Peeling piece, 37 ... Tension pulley, 3
8...Pressure pulley, 43...Endless belt, S
... Sheet.

Claims (1)

[Scope of Claims] 1. Transferring the image on the photoreceptor to the sheet by bringing a sheet into contact with the drum-shaped photoreceptor on which an image has been formed, and then separating the sheet from the photoreceptor. In the electronic copying machine of the above-mentioned type, a turn roller is arranged close to the photoreceptor, and a sear is arranged downstream of the turn roller in the traveling direction of the sheet separated from the photoreceptor.
a peeling roller which peels off the side edge of the sheet from the photoreceptor and guides the sheet to the turn roller; and an endless belt which turns the sheet 1 by pinching the side edges of the sheet with turn rollers 1111. - An endless belt was given to him. A belt pulley that presses the part of the endless belt to the turn roller, a pressure pulley that presses the endless belt to the sheet car (1' roller), and -1) places tension on the recording end belt. A tension pulley. Top?!'12 Means for freely supporting the tension roller in the direction of loosening the m-end belt;
The endless belt is moved in a direction away from the sheet guide roller (1); means for swingably supporting the pressure roller; When the bell 1 is opened, the tension pulley swings against its habit, and the tension on the endless bell 1 is released, and the pressure pulley is released. 1. A sheet separating device for an electronic multipurpose machine, characterized in that the pressure contact force between the endless belt and the turn roller and the sheet cart r roller is loosened by swinging the endless belt away from the sheet guide roller.