JPH036920Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a transfer type electrostatic copying machine.

A typical prior art is shown in Utility Model Application Publication No. 49-55049. In this prior art, a guide plate is provided near the photosensitive drum in order to easily open the copy paper conveyance path and discharge jammed copy paper. This guide plate is equipped with a pressure roller that presses the copy paper onto the photosensitive drum in order to transfer the electrostatic image on the photosensitive drum onto the copy paper conveyed by the guide plate. The downstream end of the guide plate in the copy paper conveyance direction is supported by a pin so as to be angularly displaceable. During normal copying,
The guide plate is biased by a spring so that the pressure roller is pressed against the photosensitive drum. When a paper jam occurs, this spring force is released, the guide plate is angularly displaced around the pin, and the guide plate and the pressure roller are separated from the photosensitive drum.

In such prior art, when a paper jam occurs, an attempt is made to separate the copy paper transport path between the guide plate and the photosensitive drum over as long a range as possible along the copy paper transport direction and at large intervals. As a result, the guide plate becomes longer, and therefore a larger space is required within the body of the copying machine in order to be able to angularly displace the guide plate around the pin, resulting in a large size. There is a problem of becoming

Further, in this prior art, when the paper jam occurs, the spring force of the thought spring 36 is released, and the guide plate 21 and the pressure roller 22 are rotated downward by their own weight. In this case, paper jams often occur when the leading edge of the copy paper does not reach the peeling plate 23. In such cases, the copy paper is in close contact with the copy drum 10, and the guide plate 21 cannot simply be lowered. There was a problem in that the copy paper remained in close contact with the copy drum 10, making removal work difficult.

Furthermore, as other prior art, Utility Model Application No. 49-149754
"Support structure for a guide plate in a copying machine" is mentioned. In this prior art, at least one of the upper guide plate 5 and the lower guide plate 6 constituting the paper transport path 4 on which the original image is copied is pivotally supported so that it can be expanded relative to the other. It is a feature.

In such a second prior art, the upper guide plate 5 and the lower guide plate 6 are not configured to move downward while interlocking with each other, and therefore the jammed paper is removed from the paper transport path. In doing so, for example, if the guide plates 5 and 6 are located near a photosensitive drum or the like, there is a problem that this removal work becomes complicated.

In addition, as a third conventional technique, Japanese Patent Application Laid-Open No. 52-75444
can be mentioned. In this prior art, in order to retract the guide plate 67, conveyance belt 72, transfer charger 47, separation claw 61, and casing 77 from the transfer section 10a of the photosensitive drum 10, the knob 90 is pulled toward you and moved diagonally downward. Then, the support shaft 88 moves from the upper part 3a to the lower part 3b along the guide hole 3 of the main body frame 2a, and with this movement, the casing 77 swings downward about the support shaft 79 as a fulcrum. Further, the guide plate 67 swings clockwise around the support shaft 70 by a tension spring (not shown) and retreats from the transfer section 10a (first
(see Figures and Figure 4).

In such prior art, when guiding the copy paper 63 to the photosensitive drum 10, the guide plate 67 on which the copy paper 63 is placed and guided, and the guide plate 9 arranged above the copy paper 63 are Rather than moving the paper jammed in the transfer area 10a downward, the guide plates 9 and 67 force the copy paper 63 onto the photosensitive drum 10 by moving the guide plates 9 and 67 downward.
It is not possible to perform a series of operations such as peeling off the material and then manually removing it. Therefore, there is a problem in that the operation for removing the jammed copy paper 63 is unnecessarily time-consuming.

The purpose of this invention is to solve the above-mentioned problems, to open up the copy paper transport path relatively widely, to facilitate the removal operation when a paper jam occurs, and to make it more compact. An object of the present invention is to provide a transfer type electrostatic copying machine.

In the present invention, copy paper is conveyed between a pair of lower guide plate and upper guide plate, passes through a transfer area of a photosensitive drum, and is transported downstream in the copy paper conveyance direction by a conveyance means supported by a frame. In a conveyed transfer type copying machine, the frame body is rotatably supported by the body on the downstream side of the photosensitive drum in the copy paper conveyance direction, and
A portion on the upstream side in the copy paper conveyance direction is brought close to the photosensitive drum, supported by support means for holding the frame in a substantially horizontal state, and further has an engaging portion on the upstream side in the copy paper conveyance direction, The lower guide plate has an upstream portion in the copy paper conveying direction that is rotatably supported on the body of the copying machine around a support shaft, and has an engaged portion that engages with the engaging portion of the frame. The upper guide plate is rotatably supported, and when the frame is rotated downward by operation of the support means, the lower guide plate is engaged with the engaging portion of the frame. The lower guide plate is separated from the upper guide plate on the transfer area side, and the upper guide plate is configured to rotate downward in conjunction with the rotational displacement of the lower guide plate. This is a transfer type electrostatic copying machine.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a simplified sectional view for explaining the configuration of the main parts of a transfer type electrostatic copying machine. A photosensitive drum 2 comprising a cylindrical base body and a photosensitive layer provided on the outer peripheral surface thereof is rotatably mounted approximately in the center of a body 1 of this electrostatic transfer copying machine. Photosensitive drum 2
Around the rotation direction 3, a charging corona discharger 4 that charges the photosensitive layer of the photosensitive drum 2 and a charging corona discharger 4 that visualizes the electrostatic latent image formed on the photosensitive layer of the photosensitive drum 2 are provided. A magnetic brush developing device 5 for converting the toner image into a toner image, a transfer corona discharger 6 for transferring the toner image formed on the photosensitive layer onto copy paper, and a transfer corona discharge device 6 for peeling the copy paper from the photosensitive drum 2 after the transfer process. A stripping corona discharger 7, a static elimination corona discharger 8 for removing residual charges remaining on the photosensitive layer, a static elimination lamp 8a, and a cleaning device 9 are arranged. The photosensitive drum 2, the charging corona discharger 4, the magnetic brush developing device 5, the stripping means 95, the static elimination corona discharger 8, the static elimination lamp 8a, and the cleaning device 9 are mounted on a support 10 shown by phantom lines. The support body 10 can move forward and backward in the front and rear directions of the body 1 (in a direction perpendicular to the paper plane of FIG. 1).

An optical device (not shown) is provided above the photosensitive drum 2, and the image of the document is transferred between the charging corona discharger 4 and the magnetic brush developing device 5, and the image is formed on the photosensitive layer of the photosensitive drum 2 by a dotted arrow mark. It is projected as shown in 11. As a result, an image of the document is formed on the photosensitive layer of the photosensitive drum 2.

Copy paper fed from a paper feeding device (not shown) along a copy paper conveyance path 12 indicated by a broken line is passed through a pair of upper and lower guide plates 13 and 14 and a pair of conveyance rollers 15 and 1.
6. The transfer corona discharger 6 passes through a pair of upper and lower guide plates 17, 18, a pair of feeding conveyance rollers 19, 20, and a pair of upper and lower guide plates 21, 22.
The photosensitive drum 2 is fed so as to come into close contact with the photosensitive layer of the photosensitive drum 2 facing the photosensitive drum 2 . After the transfer is completed, one end of the copy paper in the width direction is peeled off from the photosensitive layer by a peeling claw 23, and is held between peeling rollers 24 and 25, and fixed by a conveying belt 26 (not shown), which is an endless conveying means. sent to the device. The fixing device fixes the toner image on the copy paper, completing the copying process.

When at least a portion of the copy paper is in the transfer area 27 between the photosensitive drum 2 and the transfer corona discharger 6 and is charged with a charge for transfer,
In order to prevent the charge on the copy paper from escaping, each member that comes into contact with the copy paper between the upper and lower guide plates 17, 18 where the copy paper is located and the left end in FIG. 1 is electrically insulated from the machine body 1. Ru. Also, copy paper conveyance path 1
When a paper jam occurs in copy paper 2, copy paper transport path 12 is easily opened. The structures thereof will be explained in detail below.

Figure 2 shows the upper guide plate 17 and the lower guide plate 18.
3 is a plan view thereof, FIG. 4 is a sectional view taken from the cutting plane line - in FIG. 2, and FIG. 5 is a plan view of the lower guide plate 18. It is a diagram. The upper guide plate 17 is made of a metal material, and is pivotally supported on the rotating shaft 28 of the feed conveyance roller 19 via a synthetic resin bearing 29 on the downstream side (left side in FIG. 2) in the conveyance direction of the copy paper. Lower guide plate 18
is made of electrically insulating material, and the front plate 3 of the fuselage 1 is
0 and a rear side plate (not shown). A leaf spring 3 is installed between the upper guide plate 17 and the lower guide plate 18.
1 is mediated. The leaf spring 31 biases the upstream end (right side in FIG. 2) of the upper guide plate 17 in the copy paper conveying direction in a direction away from the lower guide plate 18.

A metal support member 33 having a horizontal pin 32 is fixed to the front side plate 30 . A metal locking member 34 for fixing the upper guide plate 17 is pivotally supported by the support member 33 against the biasing force of the leaf spring 31 . The boss portion 35 of the locking member 34 is rotatably fitted onto the pin 32. A lever 36 is provided on the downstream side of the locking member 34 in the copy paper conveyance direction, and a protrusion 37 is provided at the lower end of the support member 33. A torsion spring 38 is provided surrounding the boss portion 35, and one end of the torsion spring 38 is brought into contact with the lever 36.
Further, the other end is brought into contact with the protrusion 37 . Due to the spring force of this torsion spring 38, the locking member 34 is urged around the pin 32 in the direction of arrow 39 (see FIG. 2). The locking member 34 is formed with a notch 40 into which the upstream end 17a of the upper guide plate 17 in the conveyance direction is fitted, and a synthetic resin bushing 41 is fixed to this notch 40. .
By fitting the end portion 17a of the upper guide plate 17 into the notch 40 of the locking member 34 via the bushing 41, the upper guide plate 17 resists the spring force of the leaf spring 31 and connects to the lower guide plate. 18 and fixed at an appropriate distance.

When the lever 36 of the locking member 34 is rotated in the direction of the arrow 42 (see FIG. 2) against the spring force of the torsion spring 38, the end 17a of the upper guide plate 17 comes off from the bushing 41 and the upper The guide plate 17 is opened upwardly by the spring force of the leaf spring 31 as shown by the imaginary line in FIG. Therefore, the upper guide plate 1
When copy paper is jammed between 7 and the lower guide plate 18, the jammed copy paper can be easily taken out. Note that the support member 33 includes a torsion spring 3.
In order to prevent the upper guide plate 17 from bending due to the spring force of 8, a locking member 3 is provided on the upstream side in the direction of copy paper conveyance.
A blocking member 43 that comes into contact with 4 and prevents further rotation is fixed thereto.

The conveyance roller 15 and the feed conveyance roller 19 are made of metal material, and their rotating shafts 44 and 28 are supported by the front side plate 30 and the rear side plate through synthetic resin bearings 45 and 46. The conveyance roller 16 and the feed conveyance roller 20 are made of synthetic resin, and are mounted on metal rotating shafts 47 and 48 at intervals in the axial direction. Each rotating shaft 47, 48 has a bearing 49, 5
0 to the front side plate 30 and the rear side plate, respectively. The rotating shafts 47 and 48 are connected to and driven by a drive source (not shown). This rotating shaft 47, 48
The transport roller 15 is driven by the rotation of the transport roller 16 and the feed transport roller 20.
And the feed conveyance roller 19 is rotated. The bearings 45 and 46 of the rotating shafts 44 and 28 are loosely inserted into vertically extending elongated holes (not shown) formed in the front plate 30 and the rear plate, and the bearings 49 and 50 are held together by springs (not shown). biased toward the side. As a result, the conveying roller 15 and the feeding conveying roller 19 come into contact with the conveying roller 16 and the feeding conveying roller 20 and are reliably driven.

In this way, the conveying roller 15, which comes into contact with the copy paper 12a shown by the imaginary line in FIGS. 3 and 5,
16, feed conveyance rollers 19, 20 and upper and lower guide plates 17, 18 are electrically insulated from the body 1. Further, the upper and lower guide plates 17 and 18 are constructed so that they can be easily opened, so that jammed copy sheets can be easily removed.

FIG. 6 is a front view of the vicinity of the upper and lower guide plates 21 and 22 showing an embodiment of the present invention, FIG. 7 is a perspective view thereof, and FIG. 8 is a section line -
FIG. The upper guide plate 21 and the lower guide plate 22 are made of metal material. Support members 51 and 52 extending downward are fixed to both ends of the upper and lower guide plates 21 and 22 in the width direction along the copy paper conveyance direction. The support members 51 and 52 are gently penetrated in the longitudinal direction of the fuselage 1 (vertical direction in FIG. 8).
A support shaft 53 is provided, and both ends of this support shaft 53 are pivotally supported by synthetic resin receiving members 54 fixed to the front side plate 30 and the rear side plate. Upper guide plate 2
1 is rotated around the support shaft 53 so that its width is lower than the lower guide plate 22 so that the widthwise end on the downstream side in the copy paper transport direction is locked with the locking piece 57 of the receiving member 54. is also lengthened.

A receiving portion 55 that projects outward is formed on the downstream side of the support member 52 in the copy paper conveyance direction. This receiving part 5
One end of a spring 56 is connected to the spring 5, and the other end of the spring 56 is connected to the support member 51. The upper and lower guide plates 21 and 22 are urged toward each other on the downstream side in the copy paper conveyance direction by the spring force of the spring 56. Projections 58 projecting upward are provided at both ends in the width direction at the downstream end of the lower guide plate 22 in the copy paper conveyance direction. The distance d (see FIG. 6) for transporting the copy paper is maintained.
A torsion spring 59 is provided surrounding the support shaft 53, and one end of the torsion spring 59 is brought into contact with the lower surface of the lower guide plate 22. The other end of the torsion spring 59 is connected to the front plate 30 below the lower guide plate 21.
It is in contact with a horizontal pin 60 protruding from the
The lower guide plate 22 is biased clockwise around the support shaft 53 in the clockwise direction in FIG. Further rotation of the support member 52 is prevented. A contact portion 61, which is an engaged portion, is formed below the pin 60 in the lower part of the support member 52, and a frame 62 is attached to the contact portion 61 as described later.
The lower guide plate 22 and the upper guide plate 21 are rotated counterclockwise in FIG. Ru.

9 is a front view with the front plate 30 in the vicinity of the frame 62 according to the present invention omitted, and FIG. 10 is a simplified plan view of FIG. 9 with the peeling means 95 omitted. A plurality of rubber conveyor belts 26 are provided at intervals in the front-rear direction of the copying machine (vertical direction in FIG. It will be given to you. These rollers 65 to 69 are
It is pivotally supported by a frame 62 provided inwardly from the front side plate 30 and the rear side plate. In addition, the drive roller 6
The drive shaft 70 of No. 5 passes through the frame 62 via a bearing 71 and is pivotally supported by the front side plate 30 and the rear side plate via the bearing 72. Therefore, the frame body 62 is connected to the drive shaft 7
0, and the state shown in FIG. 9 is maintained by the action of the support means 73. Note that the transfer corona discharge device 6 and the peeling corona discharge device 7
is integrally fixed to the upstream portion of the frame 62 in the copy paper transport direction. The drive shaft 70 is driven by a drive source (not shown).

A pulley 74 is fixed to the drive shaft 70, and a peeling roller 25 having rubber 25a applied to the outer peripheral surface of the roller 69 is rotatably attached to the roller 69. A pulley portion 75 is formed on the peeling roller 25, and a timing belt 76 shown by a phantom line is stretched between the pulley 74 and the pulley portion 75. As a result, the circumferential speed of the peeling roller 25 that clamps the copy paper between it and the peeling roller 24 is made equal to the conveying speed of the copy paper, and the speed of the conveying belt 26 is made lower than the circumferential speed of the peeling rollers 24 and 25. Slightly faster. This prevents the copy paper from becoming wrinkled or sagging.

Referring to FIG. 10, a suction box 78 having a plurality of suction holes 77 opened upward between each conveyor belt 26 is provided in the frame 62, and an induced air blower (not shown) is installed in this suction box 78. are detachably connected. By sucking air into the suction box 78 from the suction hole 77, the copy paper is transferred to the conveyor belt 22.
It is placed tightly on top.

Separation rollers 79 made of synthetic resin are attached concentrically to the roller 69 at intervals in the axial direction thereof.

Since the outer circumferential surface of the peeling roller 25, the separation roller 79, and the conveyor belt 26 that come into contact with the copy paper 12a shown by the imaginary line in FIG. .

FIG. 11 is a front view of the support means 73 according to the present invention, and FIG. 12 is a sectional view taken along the section line XII-XII in FIG. 11. The support means 73 supports the front plate 3
A horizontal rotating shaft 80 is rotatably supported between the 0 and rear side plates, a lever 81 fixed to the end of this rotating shaft 80, and a portion of the frame 62 on the upstream side in the direction of copy paper conveyance. A synthetic resin guide member 83 that is fixed, opens downward, and is curved diagonally upward toward the upstream side in the conveying direction of the copy paper and includes a guide groove 82.
, a fitting member 85 that is fixed to the rotating shaft 80 and includes a protrusion 84 that fits into the guide groove 82 , and a lever 8
1, a release lever 86 is pivoted with a horizontal axis of rotation, and an engagement piece 87 is protruded from the front plate 30.
and a torsion spring 88 that biases the release lever 86 in the direction of engaging the engagement piece 87. lever 81
A horizontal support shaft 89 is projectingly provided on the support shaft 89, and a release lever 86 is rotatably mounted on this support shaft 89.
The engagement piece 87 is connected to the guide member 83 with respect to the rotating shaft 80.
It is provided to protrude from the front side plate 30 on the opposite side. An engagement portion 90 that engages with the engagement piece 87 is formed on the release lever 86 . The torsion spring 88 is provided surrounding the support shaft 89, and one end thereof is hung on the downstream end 81a of the lever 81 in the copy paper transport direction, and the other end is connected to the upstream end of the release lever 86 in the copy paper transport direction. It comes into contact with a grip part 86a formed in . Due to the spring force of this torsion spring 88, the release lever 86 is
9 in the clockwise direction in FIG. 11, that is, in the direction of engagement with the engagement piece 87.

The frame body 62 is pivotally supported by a drive shaft 70, and is rotated clockwise in FIG. 9 around the drive shaft 70 by the weight of the frame body 62 and each member attached to the frame body 62. Although a moving force is applied, the frame body 62 is maintained in a substantially horizontal state by positioning the projecting piece 84 of the fitting member 85 above the guide groove 82 as shown in FIG. To open the frame 62 downward when a paper jam occurs in the copy paper conveyance path 12,
Grasp the grip portion 86a of the release lever 86 and rotate the release lever 86 around the support shaft 89 in the direction of the arrow 91. As a result, the engaging portion 90 is disengaged from the engaging piece 87 against the spring force of the torsion spring 88. Next, the grip part 86a is attached to the grip part 8 of the lever 81.
1b, move the lever 81 to the rotation shaft 80.
92 in the direction of arrow 92. Accordingly, the fitting member 85 is inserted into the guide groove 82 via the rotating shaft 80.
The projecting piece 8 is rotated in the direction of the arrow 92.
4 comes off from the guide groove 82. Therefore, the frame 6
The frame body 62 is rotated clockwise in FIG. 9 around the drive shaft 70 and opened downward. Therefore, copy paper jammed in the copy paper transport path 12 can be easily removed.

The peeling roller 24 mounted on the support 10 and the peeling roller 25 mounted on the frame 62 are in contact with each other unless the frame 62 is rotated downward. Therefore, even if copy paper jams in the copy paper transport path 12, the frame body 62 can be rotated downward and the copy paper transport path 12 can be
The support body 10 supporting the photosensitive drum 2 cannot be pulled out from the body 1 unless it is opened. Therefore, it is possible to prevent the photosensitive drum 2 from being scratched by the jammed copy paper when the photosensitive drum 2 is pulled out in a state where a copy paper jam occurs. Alternatively, the upper end of the frame 62 may be extended to a position outside the lower part of the support 10, so that the support 10 cannot be pulled out unless the frame 62 is rotated downward.

An abutting piece 63 is provided protruding from the upstream end of the frame 62 in the copy paper conveyance direction, and as the frame 62 rotates downward, the abutting piece 63 moves to the abutting area of the support member 52. 61, and the contact portion 61 is pressed in the direction of arrow 93 (see FIG. 9). Referring again to FIG. 6, as the contact piece 63 presses the contact portion 61, the support member 52 and the lower guide plate 22 move around the support shaft 53 against the spring force of the spring 59. It is rotated counterclockwise in FIG. The upper guide plate 21 is
When the upper guide plate 21 rotates until a portion of the lower surface of both ends in the width direction comes into contact with the locking piece 57 of the receiving member 54, the upper guide plate 21 is prevented from rotating further. Furthermore, by rotating the lower guide plate 22 counterclockwise in FIG. 6, the upper guide plate 21 and the lower guide plate 2
The space between the two can be widened, and jammed copy paper can be easily taken out.

FIG. 13 is a plan view of a peeling means 95 provided in connection with the present invention, and FIG. 14 is an exploded perspective view thereof. The peeling means 95 includes a synthetic resin fixing member 96 fixed to the support 10 and a fixing member 96.
A horizontal pin 97 pivotally supported by the pin 97, a support member 98 pivotally supported by the pin 97, a horizontal pin 99 pivotally supported by the support member 98, a peeling claw 23 pivotally supported by the pin 99, Peeling roller 24 pivoted to 99
, a torsion spring 100 that biases the pin 99 around the pin 97 in the clockwise direction in FIG. 9, and a torsion spring 101 that biases the peeling claw 23 in the counterclockwise direction in FIG. 9 around the pin 99. including. pin 9
7 and 99 are made of metal materials, and the fixing member 96, support member 98 and peeling claw 23 are made of synthetic resin.

The pin 97 passes through the boss portion 102 of the support member 98, and the free end portion 97a is locked in a recess 104 formed at the downstream end of the peeling claw 23 in the copy paper conveyance direction. A torsion spring 100 is provided surrounding the boss portion 102, one end of the torsion spring 100 is hung on the upper surface of the locking portion 105 of the fixing member 96, and the other end is connected to one end of the pin 99 passing through the support member 98. It is hung on the top of the section. The pin 99 passes through the peeling claw 23, and the peeling roller 24 is pivotally supported at the other end. Therefore, the peeling roller 24 is urged toward the peeling roller 25 below by the spring force of the torsion spring 100.

A torsion spring 101 is provided surrounding the pin 99, one end of the torsion spring 101 is hung on the lower surface of the pin 97, and the other end is hooked on an engaging protrusion 106 protruding from the peeling claw 23. This torsion spring 10
The peeling claw 23 is urged around the pin 99 in the counterclockwise direction in FIG. 9 by a spring force of 1. However, the pin 97 is located in the recess 104 of the peeling claw 23.
Since the end 97a of the peeling claw 23 is locked, the peeling claw 23
The rotation angle range is limited to the range in which the free end 97a of the pin 97 contacts the upper surface 104a and the lower surface 104b of the recess 104.

Assume that copy paper is caught between the notch 2a at both ends of the photosensitive drum 2 and the peeling claw 23, causing a paper jam. When the frame body 62 is opened downward and the peeling rollers 24 and 25 are released from contact with each other as described above, the peeling claw 23 is removed as shown by the imaginary line in FIG.
However, due to the spring force of the torsion spring 100, the contact portion 98a of the support member 98 is pressed against the lower surface 10 of the locking portion 105.
It is rotated clockwise as shown by arrow 120 until it comes into contact with 5a. Further, the peeling claw 23 is attached to the torsion spring 10.
Due to the spring force of 1, the upper surface 104a of the recess 104
is rotated counterclockwise around the pin 99 as shown by the arrow 121 until it abuts against the pin 97, but as a whole, the distance δ between the circumferential surface of the photosensitive drum 2 and the peeling claw 23 at the notch 2a is widened. This allows you to easily remove jammed copy paper.

As another embodiment of the present invention, the conveyor belt 26 may be replaced by a conveyor means comprising a plurality of rollers arranged side by side.

As described above, according to this embodiment, when a copy paper jam occurs in the copy paper transport path 12, the release lever 86 is rotated to open the frame 62 downward. This makes it possible to easily remove the jammed copy paper.

Furthermore, in this embodiment, by the downward opening operation of the frame 62, the abutment piece 63 of the frame 62 abuts the abutment portion 61 of the support member 52, and the support member 52 and the lower guide plate 22 Rotate downward. At this time, the upper guide plate 21, which is connected to the lower guide plate 22 by the spring 56, is rotated downward by the spring force of the spring 56. At this time, as described above, the distance between the upper guide plate 21 and the lower guide plate 22 becomes much wider than the distance d shown in FIG.

In this way, the copy paper that has jammed in the space d formed by the upper and lower guide plates 21 and 22 is moved to the upper guide plate 2.
1 is forcibly peeled off from the photosensitive drum 2 by the downward rotation operation, and subsequent removal operations become much easier.

As described above, according to the present invention, the upstream portion of the lower guide plate in the copy paper transport direction is rotatably supported on the machine body, and the upper guide plate is rotated downward in conjunction with the rotational displacement of the lower guide plate. The frame body is rotatably supported on the machine body on the downstream side in the copy paper conveyance direction. As a result, when a paper jam occurs, when the lower guide plate is rotated, the upper and lower guide plates are separated and rotated downward in conjunction with each other. In this way, the frame body and the lower guide plate can be separated from the photosensitive drum, and a relatively large space can be formed between them and the photosensitive drum. Therefore, the jammed copy paper can be easily taken out. Further, the copy paper is forcibly moved from the paper jam occurrence position by the upper guide plate, making subsequent removal operations much easier.

In addition, since the portion of the lower guide plate on the upstream side in the copy paper conveyance direction and the portion of the frame body on the downstream side in the copy paper conveyance direction are each rotatably supported on the body, the desired distance between the lower guide plate and the photosensitive drum can be adjusted. The amount of angular displacement between the lower guide plate and the frame required to form the space is relatively small. Therefore, it becomes easy to downsize the aircraft.

[Brief explanation of the drawing]

FIG. 1 is a simplified cross-sectional view for explaining the configuration of the main parts of a transfer electrostatic copying machine, FIG. 2 is a simplified front view of the vicinity of the upper guide plate 17 and lower guide plate 18, and FIG. 3 is the plan view of Fig. 2, and Fig. 4 is the plan view of Fig. 2.
5 is a plan view of the lower guide plate 18; FIG. 6 is a front view of the vicinity of the upper guide plate 21 and lower guide plate 22 showing an embodiment of the present invention; 7 is a perspective view of FIG. 6, FIG. 8 is a sectional view taken along the cutting plane line - of FIG. 7, and FIG. 9 is a front view with the front plate 30 in the vicinity of the frame 62 according to the present invention omitted. , FIG. 10 is a simplified plan view of FIG. 9 with the peeling means 95 omitted, FIG. 11 is a front view of the support means 73 according to the present invention, and FIG. 12 is a section taken along the section line XII-- of FIG. 13 is a plan view of the peeling means 95 provided in connection with the present invention, FIG. 14 is an exploded perspective view of FIG. 13, and FIG. 15 shows the rotating state of the peeling claw 23. FIG. 3 is a simplified front view shown. DESCRIPTION OF SYMBOLS 1... Body, 2... Photosensitive drum, 12... Copy paper conveyance path, 21... Upper guide plate, 22... Lower guide plate, 27... Transfer area, 53... Support shaft, 70...
...Drive shaft.

Claims (1)

[Scope of Claim for Utility Model Registration] The copy paper is conveyed between the pair of lower guide plate and upper guide plate, passes through the transfer area of the photosensitive drum, and is then conveyed by the conveyance means supported by the frame. In a transfer type copying machine that is conveyed downstream in the direction, the frame body is rotatably supported by the body on the downstream side of the photosensitive drum in the copy paper conveyance direction, and
A portion on the upstream side in the copy paper conveyance direction is brought close to the photosensitive drum, supported by support means for holding the frame in a substantially horizontal state, and further has an engaging portion on the upstream side in the copy paper conveyance direction, The lower guide plate has an upstream portion in the copy paper conveying direction that is rotatably supported on the body of the copying machine around a support shaft, and has an engaged portion that engages with the engaging portion of the frame. The upper guide plate is rotatably supported, and when the frame is rotated downward by operation of the support means, the engaged portion of the lower guide plate is attached to the engaging portion of the frame. are in contact with each other, the lower guide plate is separated from the upper guide plate on the transfer area side, and the upper guide plate is configured to rotate downward in conjunction with the rotational displacement of the lower guide plate. Transfer type electrostatic copying machine.