JP3134747B2 - Recording sheet peeling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording sheet peeling apparatus for peeling off a recording sheet sucked and held by a sheet carrier from a sheet carrier in a recording sheet transport section of a copying machine, a printer, or the like. The present invention relates to an improvement in a recording sheet peeling device of a type in which a recording sheet partially peeled off by a peeling claw is scooped from a sheet carrier by a peeling guide member held in non-contact with the sheet carrier.

[0002]

2. Description of the Related Art Heretofore, as this type of recording sheet peeling apparatus, one disclosed in Japanese Patent Application Laid-Open No. 5-61364 is known. Specifically, as shown in FIGS. 10 and 11, a peeling claw 71 that appropriately contacts a sheet carrier 70 such as a dielectric film to which the recording sheet P is adsorbed, and adjacently disposed on both sides of the peeling claw 71 And the separation guide members 72 and 7 held in a non-contact state with the sheet carrier 70.
The peeling claw 71 peels a part of the leading end of the recording sheet P from the sheet carrier 70 and rides on the peeling guide member 72, while the peeling guide is accompanied by the conveyance of the recording sheet P. The member 72 goes under the recording sheet P, that is, the peeling guide member 72 scoops up the recording sheet P from the sheet carrier 70, whereby the recording sheet P is separated from the sheet carrier 70.

[0003] The peeling guide member 72 has a sheet scooping surface 73 for guiding the leading end of the recording sheet P that has climbed up. The sheet scooping surface 73 has a leading edge 74 facing the sheet carrier 70. The recording sheet P is arranged to be inclined with respect to the transport direction A. Accordingly, as the recording sheet P is transported, the sheet scooping surface 73 gradually scoops up the recording sheet P from the vicinity of the peeling claw 71 toward the side end direction of the recording sheet P (the direction of the arrow B in FIG. 10). Finally, the entire width of the leading end of the recording sheet P is completely scooped on the sheet scooping surface 73.

Further, in this recording sheet peeling apparatus, the peeling claw 71 and the peeling guide member 72 are configured to rotate individually, and when the recording sheet P is conveyed,
First, the peeling claw 71 and the peeling guide member 72 are both set at the standby position close to the sheet carrier 70 (FIG. 11B).
Then, only the peeling claw 71 comes into contact with the sheet carrier 70 to scoop up a part of the leading end of the recording sheet P (see FIG. 11C). Further, the peeling claw 71 that scoops the recording sheet P from the sheet carrier 70 is immediately reset to the standby position, whereby the leading end of the recording sheet P is lifted and rides on the peeling guide member 72 ( (A two-dot chain line in FIG. 11B).

[0005]

However, such a conventional recording sheet peeling apparatus has several problems as described below. First, as a first problem, even if the recording sheet P rides on the peeling guide member 72 in the vicinity of the peeling claw 71, in the case of a recording sheet having a weak stiffness, both ends of the recording sheet P have the leading ends of the sheet scooping surface 73. It is easy to enter between the side 74 and the sheet carrier 70.
Therefore, the traveling of the recording sheet P becomes unstable, and in an extreme case, a trouble such as a paper jam occurs.

The cause of such a problem is considered to be that the gap between the sheet carrier 70 and the leading edge 74 of the sheet scooping surface 72 is excessive at both ends of the recording sheet P. That is, as shown in FIG. 10, since the leading edge 74 of the sheet scooping surface 73 is arranged to be inclined with respect to the recording sheet conveyance direction A, this recording sheet peeling device is placed on the curved surface of the sheet carrier 70. In the case where the sheet carrier is disposed to face the front end side 74 of the sheet scooping surface and the sheet carrier 7
This is because the gap with zero must be larger at both ends of the recording sheet P than at the side of the peeling claw 71.

[0007] The second problem is that, in the process in which the recording sheet P gradually climbs on the separation guide member 72, both ends of the recording sheet P are lifted up from the sheet scooping surface 73, and the sheet scooping surface is raised. Since the recording sheet P cannot support the recording sheet P sufficiently, the running of the recording sheet P tends to be unstable.

As the cause of such a problem, the angle between the sheet scooping surface 73 and the sheet carrier 70 with respect to the side edge direction B of the recording sheet P (hereinafter referred to as the scooping angle) was considered. In this case, it is considered that this scooping angle is uniform from the peeling claw 71 side of the sheet scooping surface 73 to the other end side. That is, the peeling claw 71
In a state where the recording sheet P rides on the peeling guide member 72 only in the vicinity of the recording sheet P, most of the area of the recording sheet P is attracted to the sheet carrier 70, so that the recording sheet P The angle hanging down from the body 70 is large, and therefore, the scooping angle needs to be set large. However, in a state where most of the leading end of the recording sheet P rides on the peeling guide member 72, the recording sheet P is moved from the peeling guide member 72 to the sheet carrier 70 due to the stiffness of the recording sheet P. The tip of the recording sheet P can be scooped on the peeling guide member 72 even if the scooping angle is small. For this reason, when the scooping angle is set uniformly from the peeling claw 71 side to the other end side, it is considered that the end of the recording sheet P rises from the sheet scooping surface 73.

Further, as a third problem, the peeling claw 71
Only the sheet guide 70 is brought into contact with the sheet carrier 70 to scoop up a part of the recording sheet P. During that time, the peeling guide member 72 is held at the standby position (the state shown in FIG. 11C).
Before the sheet 1 returns to the standby position, the recording sheet P riding on the separation claw 71 interferes with the side edge 75 of the sheet scooping surface 73 located on the separation claw 71 side, and the recording sheet P
Is that the running resistance of the vehicle increases.

Further, in the conventional recording sheet peeling device, when the leading end of the recording sheet P peeled off from the sheet carrier 70 rides on the peeling guide member 72, the peeling guide member 72 retreats from the standby position at a predetermined timing. The recording sheet is configured to swing to the position (see FIG. 11A).
If the peeling guide member is swung to the retracted position in a state where the vehicle does not ride on the vehicle 2, a large gap is formed between the sheet carrier 70 and the leading edge 74 of the sheet scooping surface 73. For the same reason as the one problem, there is a problem that the running of the recording sheet P having a weak waist becomes unstable. On the other hand, in order to avoid such a problem, when the full width of the leading end of the recording sheet rides on the peeling guide member and then swings the peeling guide member to the retracted position, the recording sheet P having a strong stiffness such as a thick paper sheet is supported. When the recording sheet P is peeled off from the body 70, the leading end of the recording sheet P collides with the sheet scooping surface 73 from directly, increasing the running resistance of the recording sheet P and generating an unpleasant collision sound. . That is, this is the fourth problem.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and an object of the present invention is to remove a recording sheet from a sheet carrier and vary the running resistance of the recording sheet during the peeling operation. It is an object of the present invention to provide a recording sheet peeling device which can prevent the occurrence of the recording sheet as much as possible and can peel the recording sheet from the sheet carrier more smoothly.

[0012]

According to another aspect of the present invention, there is provided a recording sheet peeling apparatus for peeling off a recording sheet that is being sucked and held by a sheet carrier and conveyed from the sheet carrier. A peeling claw that comes into contact with the sheet carrier to peel off a part of the leading end of the recording sheet from the sheet carrier, and is arranged adjacent to the peeling claw and held in non-contact with the sheet carrier; A peeling guide member that sequentially scoops up the leading edge of the recording sheet, only part of which has been peeled off by the peeling claw, in the side edge direction as the sheet is transported, and further includes the following components corresponding to the above-described problems. It is a thing.

First, the invention according to claim 1 corresponds to the first problem, and a sheet scooping surface formed on the peeling guide member has a front end side facing the sheet carrier and a sheet carrier. Is formed in a curve having a curvature adapted to the shape of the surface.

According to the first aspect of the present invention, since the sheet scooping surface formed on the peeling guide member has a front end side formed with a curve having a curvature adapted to the surface shape of the sheet carrier. When the peeling guide member is disposed so as to face the sheet carrier, the leading edge of the sheet scooping surface is located at substantially the same distance from the sheet carrier over the entire area, and the leading edge and the sheet The gap with the carrier can be narrowed.

However, in actually manufacturing the peeling guide member, it is difficult to process the leading edge of the sheet scooping surface into such a curved line. It is preferable that the tip side of the scooping surface is formed as a straight line approximating such a curve (Claim 2).

According to a fourth aspect of the present invention, there is provided the above-described second problem, wherein a sheet scooping surface formed on the peeling guide member has a recording angle of scooping in a side edge direction of the recording sheet. It is characterized in that it is set smaller on the back side than on the near side in the sheet conveying direction.

According to the fourth aspect of the present invention, the sheet scooping surface of the peeling guide member has a smaller scooping angle toward the side end of the recording sheet on the back side than the near side in the recording sheet conveyance direction. Since the setting is set, the scooping-up angle is also increased in a state where the recording sheet rides on the peeling guide member only near the peeling claw, that is, when the angle at which the recording sheet hangs down from the peeling guide member to the sheet carrier is large. On the other hand, when most of the leading edge of the recording sheet has climbed onto the peeling guide member, that is, when the angle at which the recording sheet hangs down from the peeling guide member to the sheet carrier is small, the scooping angle is also small, and the edge of the recording sheet is small. It is possible to prevent the section from rising from the sheet scooping surface.

Further, the invention described in claim 5 corresponds to the third problem, and a sheet scooping surface formed on the peeling guide member has a side edge located on the peeling claw side,
On the side edge, the leading end of the recording sheet is located below a locus drawn by the recording sheet.

According to the fifth aspect of the present invention, the sheet scooping surface of the peeling guide member has a side edge located on the side of the peeling claw and a leading edge of the recording sheet drawn on the side edge. Since the recording sheet is located below the trajectory, the leading edge of the recording sheet scooped up from the sheet carrier by the peeling claw does not interfere with the side edge of the sheet scooping surface, thereby suppressing the running resistance of the recording sheet. Can be.

Further, the invention according to claim 6 corresponds to the fourth problem, and when peeling off the recording sheet from the sheet carrier, the peeling guide member moves in a direction away from the sheet carrier. The recording sheet is swung, and the swing timing is changed according to the stiffness of the recording sheet.

According to the present invention, the timing at which the peeling guide member swings away from the sheet carrier depends on the stiffness of the recording sheet peeled from the sheet carrier. Since it is changed, the peeling guide member can be swung at an optimum timing according to the difference between the thick paper and the thin paper, and the running resistance of the recording sheet can also be suppressed.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a recording sheet peeling device according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows an example of a color copying machine to which the present invention is applied.
In the figure, reference numeral 20 denotes a photosensitive drum, 21 denotes a charging corotron for charging the surface of the photosensitive drum 20 in advance, 22
Denotes a photosensitive drum 2 charged by a charging corotron 21
Exposure scanning system for writing an electrostatic latent image on 0, reference numeral 23 denotes four developing units 23B for accommodating black (B), cyan (C), magenta (M), and yellow (Y) toner images, respectively.
A rotary developing unit 23C, 23M, and 23Y are rotatably disposed, and are appropriately selected. 24 is a pre-transfer corotron for removing the potential on the photosensitive drum 20, 25.
Reference numeral denotes a cleaner for removing residual toner on the photosensitive drum 20, and reference numeral 26 denotes an erase lamp for removing residual charges on the photosensitive drum 20.

In this embodiment, the exposure scanning system 22
An exposure lamp 223 for illuminating a document 222 set on a platen 221;
A carriage 224 that moves over the region, a reflection mirror 225 that guides a beam from the surface of the document 222 by an exposure lamp 223 along a predetermined path, and a color that converts the beam from the surface of the document 222 into a digital signal for each color component. An image sensor 226, an image forming lens 227 for forming an image of a beam from the surface of the document 222 on the color image sensor 226, and a laser beam of the photosensitive drum 20 based on an image signal of each color component captured by the image sensor 226. And a laser scanning unit 228 for irradiating along the main scanning direction.

Reference numeral 31 denotes a recording sheet 30 wound around and held on the peripheral surface.
This is a transfer drum for sequentially multiple-transferring each color component toner image on 0. The transfer drum 31 is formed by stretching a drum sheet such as polyvinylidene fluoride on a drum frame, and the recording sheet 30 is electrostatically attracted by previously charging the drum sheet.

Further, on the transfer drum 31, an adsorbing corotron 41 for charging the drum sheet when the recording sheet 30 is held, and a toner image on the photosensitive drum 20 are recorded on the recording sheet 3.
A transfer corotron 42 for transferring to the 0 side, a charge removing corotron 43 for removing charge from the recording sheet 30 after the transfer process of the final color, and the drum sheet 3 having a transfer process of the final color
5 for removing charge on cleaning corotron 44
A cleaning brush 45 for cleaning paper dust and the like adhering to the drum sheet after the final color transfer process is completed; an inner press roller 46 for lifting the drum sheet from inside when the recording sheet 30 is peeled; And a peeling device 47 of the present invention. Reference numeral 48
Reference numeral denotes a sheet transport system that transports the recording sheet 30 supplied from a sheet feeding cassette (not shown) to the suction corotron 41 at a predetermined timing according to each mode.

Reference numeral 50 denotes a fixing device for passing the recording sheet 30 having undergone the transfer step and fixing an unfixed toner image on the recording sheet 30, and a heating roll 51 having a built-in heater therein and a heating roller And a pressure roll 52 which is pressed against the roll 51. Also, reference numeral 5
Reference numeral 4 denotes a fuser exit roll that conveys the recording sheet 30 that has passed through the fixing device 50, reference numeral 56 denotes a discharge tray that stores the fixed recording sheet 30, and reference numeral 57 denotes an exit roll that sends the recording sheet 30 to the discharge tray 56. is there.

In the color copier constructed as described above, first, when the user operates the copy start switch, the original 222 is scanned, and the photosensitive drum 20 is scanned.
An electrostatic latent image corresponding to black K is written thereon. On the other hand, in the rotary developing unit 23, the black developing device 23K is set at a position facing the photosensitive drum 20, and the electrostatic latent image is developed by the black developing device 23K with a slight delay from the writing timing. Then, the black K toner image thus formed is transferred to the recording sheet 30 held on the transfer drum 31. When the developing process by the black developing device 23K is completed, the developing device is replaced before the transfer drum 31 completes one rotation cycle, and the yellow developing device 23Y is exposed by rotating the rotary developing unit 23 by 90 °. It is set at a position facing the body drum 20.

Thereafter, these operations are repeated for each rotation cycle of the transfer drum 31, and each time, the yellow Y, magenta M and cyan C toner images are transferred from the photosensitive drum 20 to the recording sheet held on the transfer drum 31. The toner image is transferred onto the recording sheet 30, and a superimposed toner image of four color toner images is formed on the recording sheet 30. Then, the recording sheet 30 on which the transfer of the cyan C toner image has been completed is peeled off from the transfer drum 31 as it is and passes through the fixing device 50 to the discharge tray 56.
Is discharged.

Next, the peeling device 47 which is a main part of the present invention will be described. As shown in FIGS. 2 and 3, the peeling device 47 is provided at a position slightly displaced from the axial center of the transfer drum 31, and a peeling claw 60 that appropriately contacts the transfer drum 31. And a pair of separation guide members 61, 61 which are arranged adjacent to both sides of the transfer drum 31 and held in non-contact with the transfer drum 31. The peeling claw 60 is fixed to a rotating shaft 62 supported by a frame (not shown) of the copying machine, while the peeling guide member 61 is fixed to a support frame 63 rotatably engaged with the rotating shaft 62. Have been.

The tip 60a of the peeling claw 60 is formed in a spire shape. When the peeling claw 60 comes into contact with the transfer drum 31, the tip 60a slightly pushes the drum sheet and electrostatically attracts the drum sheet. Under the recording sheet 30 which is located. A flat guide surface 60b is formed above the peeling claw 60, and the recording sheet 30
Are slid on the guide surface 60b and ride on the separation guide member 61.

On the other hand, the peeling guide member 61 has a sheet scooping surface 6 on the front surface facing the recording sheet 30 in the conveying direction.
1a, and the sheet scooping surface 61a is arranged to be inclined with respect to the peripheral surface of the transfer drum 31, while being formed so as to retreat backward as it moves away from the peeling claw 60. Several ribs 61b are formed at appropriate intervals behind the sheet scooping surface 61a to support the recording sheet 30 peeled off from the transfer drum 31 from below.

The peeling claw 60 is urged by a spring (not shown) in a direction in which its tip is separated from the transfer drum 31, while the peeling guide member 61 is
Is also urged by a spring (not shown) in a direction approaching the above. Also, the peeling claw 60 and the peeling guide member 61
4A are mutually locked, and when the external force is not applied, the positional relationship shown in FIG. 4A is always maintained, and in the direction away from the transfer drum 31 by the urging force acting on the peeling claw 60. Supported. And
The peeling claw 60 is driven in a direction approaching the transfer drum by a solenoid (not shown), and when the peeling claw 60 rotates, the peeling guide member also follows. ing.

FIG. 4 shows a series of operations of the peeling claw 60 and the peeling guide member 61, which are observed from the axial direction of the transfer drum 31. First, when the toner image is transferred from the photosensitive drum 20 to the recording sheet 30, the peeling claw 60 and the peeling guide member 61 are moved by the urging force of the spring so that the transfer drum 31 is not hindered. Evacuation position (Fig. 4
(A)). Thereafter, when the transfer of the toner image is completed and the recording sheet 30 is to be released, the solenoid is driven to release the release claw 60 and the release guide member 6.
1 are both set to the standby position (see FIG. 4B).

The peeling guide member 61 is stopped from rotating at this standby position, and is held in a non-contact state with the transfer drum 31. Then, the transfer drum 31 hits the drum sheet 35 of the transfer drum 31. (See FIG. 4C). At this time, the drum sheet 35 is pressed by the peeling claw 60 and slightly bends. Therefore, as the transfer drum rotates, the leading end 60 a of the peeling claw 60 goes under the recording sheet 30, and the leading end of the recording sheet 30 A part is separated from the transfer drum 31. Thereafter, the recording sheet 30 reaches the peeling guide member 61 as it is conveyed, and rides on the sheet scooping surface 61a from near the peeling claw 60. Further, in order that the recording sheet 30 can easily get on the peeling guide member 61,
The peeling claw 60 scooping up the leading end of the recording sheet 30 is reset to the standby position (see FIG. 4B), and after the leading end of the recording sheet 30 rides on the peeling guide member 61, retracts together with the peeling guide member 61. It is reset to the position (Fig. 4
(A)).

The sheet scooping surface 61a has a peeling claw 60
When the recording sheet 30 rides on the sheet scooping surface 61a in the vicinity of the peeling claw 60, the peeling guide member 61 moves the leading end of the recording sheet 30 along with the conveyance. Scoop up sequentially in the end direction B. And finally, the recording sheet 30
The entire width of the leading end of the recording sheet 30 rides on the separation guide member 61, and the recording sheet 30 is completely separated from the transfer drum 31.

In this embodiment, when resetting the peeling guide member 61 from the standby position to the retracted position, the setting timing is different depending on the type of the recording sheet. More specifically, when peeling a weak recording sheet 30 such as a normal copy sheet from the transfer drum 31, as shown in FIG. 5, the leading end of the recording sheet 30 extends over the entire width thereof. When the peeling guide member 61 is reset from the standby position to the retracted position after riding on the sheet scooping surface 61a of the member 61, when the strong recording sheet 30 such as a postcard or cardboard is peeled from the transfer drum 31, As shown in FIG. 6, as soon as a part of the leading end of the recording sheet 30 rides on the sheet scooping surface 61a of the peeling guide member 61, the peeling guide member 61 is reset from the standby position to the retracted position. .

As a result, for the recording sheet 30 having a weak stiffness, the leading end of the recording sheet 30 is
Until the recording sheet 30 is peeled off from the transfer drum 31, the gap between the transfer drum 31 and the leading edge 64 of the sheet scooping surface 61a can be minimized until the transfer sheet 31 completely rides. The trouble that both ends of the recording sheet 30 enter the gap can be avoided.
Further, for the recording sheet 30 having a strong stiffness, when a part of the leading end of the recording sheet 30 rides on the peeling guide member 61, the leading end of the recording sheet 30 is reset by resetting the peeling guide member 61 to the retracted position. Since the angle of collision with the sheet scooping surface 64 can be made shallow, the running resistance of the recording sheet 30 due to the collision with the sheet scooping surface 64 can be reduced as much as possible, and the occurrence of collision noise is also suppressed. be able to.

Next, the detailed shape of the sheet scooping surface 61a formed on the peeling guide member 61 of this embodiment will be described. First, the leading edge 64 of the sheet scooping surface 61a facing the transfer drum 31 is formed in a curved shape adapted to the curvature of the transfer drum 31, and when the peeling guide member 61 is set to the standby position, the leading edge 64 The gap between the transfer drum 64 and the transfer drum is substantially equidistant over the entire width from the peeling claw side to the other end side. That is, as shown in FIG. 4B, the distance between the tip side 64 and the transfer drum 31 on the peeling claw side is d ₁ , and the distance between the tip side 64 and the transfer drum 31 on the other end side is d _2. And d ₁ = d ₂ .

Thus, the leading edge 64 of the sheet scooping surface 61a can be brought closer to the peripheral surface of the transfer drum 31, so that the recording sheet 30 scooped up by the peeling claw 60 can be used.
Can smoothly climb onto the sheet scooping surface 61 a, thereby preventing both ends of the recording sheet 30 from entering between the leading edge 64 and the transfer drum 31.

In this embodiment, the sheet scooping surface 61a
Is formed in a curved shape, but the curvature of this curve is very small in view of the curvature of the peripheral surface of the transfer drum. Therefore, the leading edge 64 is formed in a straight line most similar to the above curve. Is also good.

In this embodiment, the peeling guide member 61 is used.
Of the sheet scooping surface 61a is always supported by the sheet scooping surface 61a, and the leading edge 64 of the sheet scooping surface 61a always contributes to the separation of the transfer drum 31 and the recording sheet 30. The scooping angle was changed according to the distance from the peeling claw 60. Here, the scooping angle is an angle formed by the sheet scooping surface 61a and the transfer drum 31 in the side end direction B of the recording sheet 30 as described above.

FIGS. 7 to 9 show this, and respectively show cross sections of the peeling guide member 61 cut in order from the near side in the recording sheet conveying direction. 7 shows the scooping angle α in the vicinity of the peeling claw 60, FIG. 9 shows the scooping angle γ in the vicinity of both ends of the peeling guide member 61, and FIG. The intermediate scooping angle β is shown. In the present embodiment, the scooping angle is set to be smaller nearer to the peeling claw, in other words, at the back side in the conveying direction of the recording sheet than at the near side. That is, FIG.
7, the relationship α>β> γ is established. still,
These scooping angles α and β are different from the angle that the leading edge 64 of the sheet scooping surface 61 a forms with the transfer drum 31 in the side end direction B of the recording sheet 30.

The recording sheet 30 riding on the peeling guide member 61 hangs down to the transfer drum 31 at a large angle near the peeling claw 71 and hangs down at a small angle near both ends of the peeling guide member 61. According to the sheet scooping surface 61 of this embodiment, the recording sheet 3 has a large scooping angle near the peeling claw 71.
0 can be scooped onto the peeling guide member 61, and the recording sheet 30 can be scooped onto the peeling guide member 61 with a small scooping angle near both ends of the peeling guide member 61.

Accordingly, as the recording sheet 30 advances from the near side to the far side in the conveying direction on the sheet scooping surface 61a, as the sagging angle of the recording sheet decreases, the scooping angle of the sheet scooping surface 61a also increases. Because it becomes smaller,
The recording sheet 30 does not rise from the sheet scooping surface 61a, and the leading edge 64 of the sheet scooping surface 61a always contributes to the separation between the transfer drum 31 and the recording sheet 30. Thus, in this embodiment, the recording sheet 30 can be separated from the transfer drum smoothly. Then, according to the confirmation by the inventors of the present application, the scooping angle α in the vicinity of the peeling claw 60 is α ≧ 20.
When the scooping angle γ near both ends of the peeling guide member 61 was set to γ ≦ 15 °, the running resistance of the recording sheet was small and the recording sheet 30 could be separated from the transfer drum smoothly.

Further, in the present embodiment, in order for the recording sheet 30 that has climbed on the peeling claw 60 to smoothly climb on the peeling guide member 61, the locus of the leading end of the recording sheet 30 scooped up by the peeling claw 60 is drawn. The height of the side edge 65 of the sheet scooping surface 61a adjacent to the peeling claw 60 is set to be lower than that of the one-dot chain line shown in FIG. Specifically, the corner 66 formed by the side edge 65 and the rib 61b continuous thereto is chamfered so that the corner 66 does not intersect with the locus drawn by the leading end of the recording sheet 30 (FIG. 4 (c)).

Thus, the recording sheet 30 scooped from the transfer drum 31 by the peeling claw 60 does not interfere with the sheet side edge 65 of the scooping surface 61a.
It was possible to suppress an increase in the running resistance of the recording sheet 30 when the recording sheet 30 was peeled from the transfer drum 31.

[0047]

As described above, according to the first aspect of the present invention, the leading edge of the sheet scooping surface is formed into a curve having a curvature adapted to the surface shape of the sheet carrier. Since the gap between the leading edge and the sheet carrier can be reduced, both ends in the width direction of the recording sheet do not sneak the separation guide member with the sheet carrier,
It is possible to stabilize the running of the recording sheet and prevent a trouble such as sheet jamming as much as possible.

According to the fourth aspect of the present invention,
The scooping angle of the recording sheet by the sheet scooping surface is set to be smaller on the back side than the near side in the recording sheet conveyance direction, and the scooping angle also changes according to the angle at which the recording sheet hangs down from the release guide member to the sheet carrier. So,
The recording sheet can always be peeled from the transfer drum while being supported by the sheet scooping surface, stabilizing the running of the recording sheet during the peeling operation, and preventing problems such as sheet jamming as much as possible. Becomes

Further, according to the invention described in claim 5,
The side edge of the sheet scooping surface is located below the locus drawn by the leading edge of the recording sheet, and the leading edge of the recording sheet scooped up from the sheet carrier by the peeling claw may interfere with the side edge. Therefore, the running resistance of the recording sheet during the peeling operation can be suppressed, the running of the recording sheet can be stabilized, and troubles such as sheet jamming can be prevented as much as possible.

Further, according to the present invention, at the time of peeling the recording sheet, the timing at which the peeling guide member swings in the direction away from the sheet carrier is determined according to the stiffness of the recording sheet. Since the peel guide member can be swung at the optimal timing according to the difference between thick paper and thin paper, the running resistance of the recording sheet during the peeling operation is also suppressed and the running of the recording sheet is stabilized. It is possible to do.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of a color copying machine to which a recording sheet peeling device of the present invention is applied.

FIG. 2 is a perspective view showing an embodiment of a recording sheet peeling device of the present invention.

FIG. 3 is a plan view showing a recording sheet peeling device according to the embodiment.

FIG. 4 is a side view showing the operation of the recording sheet peeling device according to the embodiment.

FIG. 5 is a diagram showing a reset timing of the peeling guide member to the retracted position when the recording sheet has a weak stiffness.

FIG. 6 is a diagram showing the reset timing of the peeling guide member to the retracted position when the recording sheet is strong.

FIG. 7 is a sectional view taken along the line AA ′ of FIG. 3;

FIG. 8 is a sectional view taken along the line BB ′ of FIG. 3;

FIG. 9 is a sectional view taken along the line CC ′ of FIG. 3;

FIG. 10 is a plan view showing a conventional recording sheet peeling device.

FIG. 11 is a side view showing the operation of a conventional recording sheet peeling device.

[Explanation of symbols]

31: transfer drum (sheet carrier), 47: recording sheet peeling device, 60: peeling claw, 61: peeling guide member, 61
a: sheet scooping surface, 64: leading edge, 65: side edge

Continued on the front page (72) Inventor Takashi Kawabata 2274 Hongo, Ebina-shi, Kanagawa Prefecture, within Fuji Xerox Co., Ltd. (72) Inventor Satoshi Matsuzaka 2274 Hongo, Ebina-shi, Kanagawa Prefecture, within Fuji Xerox Co., Ltd. (56) Reference Reference JP-A-5-61364 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03G 15/16 G03G 15/14 101

Claims (8)

(57) [Claims] 1. A recording sheet peeling device for peeling off a recording sheet sucked and held by a sheet carrier and being conveyed from the sheet carrier, wherein a part of a leading end of the recording sheet is brought into contact with the sheet carrier. The peeling claw to be peeled off from the sheet carrier, and the peeling claw is disposed adjacent to the peeling claw and is held in non-contact with the sheet carrier. With a peeling guide member that sequentially scoops up in the side end direction, a sheet scooping surface formed on the peeling guide member,
A recording sheet peeling device, wherein a tip side facing the sheet carrier is formed in a curve having a curvature adapted to a surface shape of the sheet carrier. 2. The recording sheet peeling device according to claim 1, wherein the front end side of the sheet scooping surface is formed into a curved line having a curvature adapted to the surface shape of the sheet carrier, and a straight line approximated to the curved line is used. A recording sheet peeling device, wherein the recording sheet peeling device is formed. 3. The recording sheet peeling device according to claim 1, wherein the leading edge of the sheet scooping surface is located at substantially the same distance from the sheet carrier over the entire area. 4. A recording sheet peeling device that peels off a recording sheet that has been sucked and held by a sheet carrier and conveyed from the sheet carrier, wherein a part of the leading end of the recording sheet is brought into contact with the sheet carrier. The peeling claw to be peeled off from the sheet carrier, and the peeling claw is disposed adjacent to the peeling claw and is held in non-contact with the sheet carrier. With a peeling guide member that sequentially scoops up in the side end direction, a sheet scooping surface formed on the peeling guide member,
A recording sheet peeling device, wherein a scooping-up angle of a recording sheet in a side end direction is set to be smaller at a depth side than at a near side in a recording sheet conveyance direction. 5. A recording sheet peeling device for peeling off a recording sheet sucked and held by a sheet carrier and being conveyed from the sheet carrier, wherein a part of a leading end of the recording sheet is brought into contact with the sheet carrier. The peeling claw to be peeled off from the sheet carrier, and the peeling claw is disposed adjacent to the peeling claw and is held in non-contact with the sheet carrier. With a peeling guide member that sequentially scoops up in the side end direction, a sheet scooping surface formed on the peeling guide member,
A recording sheet peeling device, wherein the side edge located on the side of the peeling claw is located below a locus drawn by the leading end of the recording sheet on the side edge. 6. A recording sheet peeling device for peeling off a recording sheet sucked and held by a sheet carrier and being conveyed from the sheet carrier, wherein a part of the leading end of the recording sheet is brought into contact with the sheet carrier. The peeling claw to be peeled off from the sheet carrier, and the peeling claw is disposed adjacent to the peeling claw and is held in non-contact with the sheet carrier. A peeling guide member which is sequentially scooped up in the side end direction, and when the recording sheet is peeled from the sheet carrier, the peeling guide member swings in a direction away from the sheet carrier, and the swing timing Is changed according to the stiffness of the recording sheet. 7. When the stiffness of the recording sheet peeled off from the sheet carrier is weak, the leading edge of the recording sheet rides on the peeling guide member over its entire width, and then the peeling guide member is swung. 7. The recording sheet peeling device according to claim 6, wherein: 8. When the recording sheet peeled from the sheet carrier has a strong stiffness, the peeling guide member is swung when a part of the leading end of the recording sheet rides on the peeling guide member. 7. The recording sheet peeling device according to claim 6, wherein: