JPH021299Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roller support device for an electrostatic copying machine.

Typical prior art is, for example, Utility Model Act 1977-
Shown in 23345. This prior art has a structure in which the cloth is conveyed by sandwiching it between a pair of upper and lower rollers,
One axial end of the upper roller is provided to be angularly displaceable about an axis perpendicular to the upper roller, thereby opening and closing the cloth conveyance path. To move the upper roller angularly from the non-working position where it is separated from the lower roller to the working position where the upper roller is close to or in contact with the lower roller and the cloth is conveyed between both rollers, it is necessary to move the upper roller in the axial direction. The suspension claw provided at the other end is configured to be suspended in a notch provided in the bearing of the lower roller.

In such prior art, when moving the upper roller from the non-operating position to the operative position by suspending the hanging pawl in the missing position, the operator keeps pushing the upper roller downward with one hand and presses the upper roller downward with the other hand. The operation is complicated, as the user must use his or her hands to manually lock the hanging claw. Particularly when the structure becomes large, a large force is required to press the upper roller against the lower roller, resulting in poor operability.

Other prior art is shown in Utility Model Application Publication No. 52-110837. In this prior art, one end of the upper roller in the axial direction of the pair of upper and lower rollers is provided so as to be freely angularly displaceable around an axis perpendicular to the upper roller, and is moved to a fixed position by a latch that is swingably provided. The upper roller is configured to be kept close to or in contact with the lower roller. In this prior art, as described above, when moving from a non-working position where the upper roller is separated from the lower roller to a working position where the upper roller is close to or in contact with the lower roller, the upper roller is moved toward the lower roller. The latch must be operated while pressed to maintain the working position.
Therefore, the operability is poor, and if the device is large, the upper roller must be pressed against the lower roller and the latch must be operated to maintain the operating position, resulting in poor operability. Moreover, when the apparatus is large in size, the latch must be operated while pressing the upper roller against the lower roller with great force, making the operation even worse.

Still another prior art is shown in Utility Model Application Publication No. 48-41246. In this prior art, the lower roller of an upper and lower pair of rollers that transport photosensitive paper in an electrophotographic copying machine is provided on a support, and this support is mounted behind the machine frame in the direction of transport of the photosensitive paper. It is rotatable around parallel axes, and can be opened and closed on the front side of the machine frame by a so-called snap-in elastic engagement member, which is fixed to the side plate of the machine frame. A snap stopper, a snap lever attached to the lower end of the metal fitting so that it can be opened and closed with a pin, and a U whose free end is pivoted to the lever.
A U-shaped bent end of the snap-in locking spring is configured to removably engage with a locking protrusion of the support.

In such prior art, in order to open the support downward in the event of a paper jam, the user must use one hand to remove the locking lever from the locking fitting, which causes the locking spring to move downward. Then, the snap-in stop spring and the locking protrusion remain in a loosely engaged state, and then, with the other hand, remove the snap-in stop spring from the locking protrusion. Therefore, the operator must use both hands, resulting in poor operability and being unable to immediately remove the jammed photosensitive paper. Further, after removing the jammed photosensitive paper, it is necessary to use both hands to restore the original state, and in this respect, operability is also poor.

This prior art also requires relatively large forces for the angular displacement actuation of the locking lever, which again results in poor operability.

Furthermore, in this prior art, when operating the snap lever to angularly displace the support in order to open the support downward, if the weight of the support is large, the support will open downward with a large impact force. Such impact forces result in an adverse effect on the copy quality of the electrophotographic copier.

Still another prior art is disclosed in Utility Model Application Publication No. 54-102878. In this prior art, in order to evacuate and return the transport unit that forms part of the copy paper transport path, the copy paper transport unit is pivoted to the machine body, and the transport unit is moved up and down using a transport unit push-up lever. , the angular displacement position of this push-up lever is releasably engaged by a lock mechanism.

Such prior art obviously has a complicated structure, and since the conveying unit only constitutes a part of the copy paper conveyance path, it is difficult to remove the jammed copy paper from the remaining part of the conveyance path. It is not possible.

The purpose of this invention is to improve operability by making it easier to open and close the entire length of the copy paper conveyance path, and to avoid generating large impact force when opening and closing, and to provide a lock for electrostatic copying machines with a simplified configuration. It is to provide a support device.

In the present invention, the copy paper is transferred to at least one pair of upper and lower rollers 25a, 25b, 26a, 26.
b, 27a, 27b, 28a, 28b, 29a,
In a roller support device for an electrostatic copying machine that conveys a copy paper conveyance path along the conveyance direction 31 by a roller 29b, the lower rollers 25b, 26b, 27 of the pair of rollers extending over the entire length of the copy paper conveyance path.
b, 28b, and 29b are pivotally supported, and connected to the body so that one end in the transport direction 31 can rotate around an axis perpendicular to the transport direction 31 and the other end in the transport direction 31 can open downward. a support frame 60 that is placed near the other end of the support frame 60 in the transport direction 3;
a lever 64 that is rotatable around an axis perpendicular to the frame 1 and whose lower end is pivoted to the body 1; and a lever 64 that slides into sliding contact with a sliding surface 60e that is provided on the lever 64 and extends along the transport direction 31 of the support frame 60. The sliding contact piece 63 includes a locking protrusion 61 formed on the support frame 60 on either the upstream side or the downstream side in the conveying direction 31 with respect to the rotation axis of the lever 64. The copy paper is conveyed by contacting with the support frame 60 on either side and maintaining a predetermined posture.
This is a roller support device for an electrostatic copying machine, characterized in that the roller is in an open state.

In a preferred embodiment, one of the lower rollers is the fixing roller 28b, and the support frame 60 is formed with a long hole 32 extending vertically through which the shaft 33 of the fixing roller 28b is inserted. Support lever 3 supporting 33
4 is pivotally supported on a support frame 60, and the fixing roller 28b is provided so as to be freely displaceable up and down along the elongated hole 32. The fixing roller 28 is biased by a spring, and when the support frame 60 is closed, the fixing roller 28
The shaft 33 of b does not contact the upper part of the elongated hole 32, and the fixing roller 28b contacts the other fixing roller 28a of the pair, and when the support frame 60 is open, the shaft 33 Long hole 3
It is characterized in that it comes into contact with the upper part of 2.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a simplified cross-sectional view of one embodiment of the present invention. A transparent plate 2 on which a document is placed horizontally is provided on the top of a body 1 of this electrostatic transfer copying machine. A document holding plate 3 is provided to cover the transparent plate 2 and press the document against the transparent plate 2. Paper feed cassettes 5 and 6 for feeding copy paper are detachably attached to the side of the machine body 1. Copy sheets of different sizes are stored in these paper feed cassettes 5 and 6, respectively.

A photosensitive drum 7 comprising a cylindrical base and a photosensitive layer provided on the outer circumferential surface of the body 1 is rotatably mounted in the center of the body 1 . Around the photosensitive drum 7, a charging corona discharger 9 for charging the photosensitive layer of the photosensitive drum 7 and an electrostatic latent image formed on the photosensitive layer of the photosensitive drum 7 are arranged sequentially along the rotation direction 8 of the photosensitive drum 7. A magnetic brush developing device 10 for visualizing the toner image, a transfer corona discharger 11 for transferring the toner image formed on the photosensitive layer onto copy paper, and a transfer corona discharger 11 for removing residual charges remaining on the photosensitive layer. Corona discharger for static elimination 1
2 is placed.

An optical device 15 for forming an image of a document on the photosensitive drum 7 is provided above the photosensitive drum 7 . This optical device 15 includes a light projecting means 18 consisting of an exposure lamp 16 and a reflecting wall 17 for projecting light onto the document through the transparent plate 2, and a light projecting means 18 that projects light onto the document and reflects the light. Movable reflective mirrors 19, 20 that reflect, these movable reflective mirrors 19, 20
It is composed of an in-mirror lens 21 that reflects and collects the light reflected by the in-mirror lens 21, and a reflecting mirror 22 that reflects the light collected by the in-mirror lens 21 and projects it onto the photosensitive drum 7. .

Paper feed rollers 23 and 24 are provided above the tips of the paper feed cassettes 5 and 6, respectively. The copy paper fed from the paper feed rollers 23, 24 passes through a pair of upper and lower transport rollers 25a, 25b, and a pair of upper and lower feed transport rollers 26a, 26b along the copy paper transport path 13 shown by the broken line, and then passes through a pair of upper and lower feed transport rollers 26a, 26b. The photosensitive drum 7 is fed into close contact with the photosensitive layer of the photosensitive drum 7 facing the corona discharger 11 . After the transfer is completed, one end of the copy paper in the width direction is moved to a pair of upper and lower peeling rollers 2.
It is separated from the photosensitive drum 7 while being held between the rollers 7a and 27b, and sent to a fixing device having a pair of upper and lower fixing rollers 28a and 28b. This fixing roller 28
After the toner image on the copy paper is fixed under pressure by rollers a and 28b, a pair of upper and lower discharge rollers 29a and 29
The copy paper is discharged from the discharge port 30 by b, and the copying process is completed.

The lower rollers 25b, 26b, 27b, 28b, 2 among the rollers constituting the copy paper transport path 13
9b is rotatably supported by the support frame 60, and the transfer corona discharger 11 is fixed to the support frame 60. In this embodiment, the support frame 60 is attached to the copy paper transport direction 31 at the lower end along the copy paper transport direction 31.
It is pivotally supported on the fuselage 1 so as to be rotatable around a horizontal axis perpendicular to .

FIG. 2 is a perspective view of the support frame 60. Furthermore, the second
In the figure, the guide plate disposed between each roller is omitted for the sake of simplification. The support frame 60 basically has side walls 60a, 6 on both sides along the copy paper conveyance direction 31.
0b, and end walls 60c and 60d that connect the ends of those side walls 60a and 60b. Rollers 25b, 26b, 27b, 29b are supports 30
It is rotatably supported on both side walls 60a and 60b of. Side walls 60a, 6 correspond to the fixing roller 28b.
A long hole 32 extending vertically is formed in 0b, and both ends of the shaft 33 of the fixing roller 28b pass through the long hole 32 so as to be freely displaceable in the vertical direction. Both ends of the shaft 33 are pivotally supported in the middle of the lever 34 at a position outward from the side walls 60a, 60b. A long hole 32 along the conveyance direction 31
On the lower side, a pin 35 parallel to the shaft 33 is protruded from the side walls 60a, 60b, and one end of the lever 34 is pivotally supported by the pin 35. The lower ends of springs 36 extending vertically are connected to the other ends of the levers 34, and the upper ends of the springs 36 are connected to the fuselage 1.
are connected to each other. Therefore, the lever 34
is biased counterclockwise in FIG. 2 around the pin 35 by the spring force of the spring 36, so that the shaft 33 and the fixing roller 28b are biased upward. As a result, the fixing roller 28b is pressed against the fixing roller 28a. The bottom portion 60e, which is a sliding surface extending along the conveying direction 31 of the support frame 60, is formed to be inclined downward toward the copy paper conveying direction 31, and a bottom portion is formed at the upper end along the copy paper conveying direction 31. A locking protrusion 61 is provided that protrudes downward from 60e. On the downstream side of the copy paper conveyance direction 31, the machine body 1 is provided with a horizontal support shaft 62 perpendicular to the conveyance direction 31, and the support frame 60 is attached to this support shaft 62.
is supported by.

FIG. 3 is a front view of the vicinity of the locking protrusion 61 of the support frame 60. Below the end of the support frame 60 on the upper side along the copy paper transport direction 31, an interlocking shaft 62 that is horizontal and perpendicular to the copy paper transport direction 31 is provided over the entire width of the support frame 60. One end of the interlocking shaft 63 is pivotally supported in the middle of an operating lever 64 that extends up and down. The other end of the interlocking shaft 63 is pivotally supported by the upper end of a leg member 65 that extends vertically. Operation lever 64 and leg member 6
5 is pivotally supported on brackets 66a, 66b provided on the bottom 1c of the body 1 via pins 67a, 67b parallel to the interlocking shaft 63. The interlocking shaft 63 contacts the lower surface of the bottom portion 60e, and the interlocking shaft 63
is in contact with the locking protrusion 61, and each pair of rollers in the copy paper conveyance path 13 is in a state of being pressed with an appropriate force.

The axis of the interlocking shaft 63 is such that the interlocking shaft 63 is connected to the locking protrusion 6
1, it is located on the upper side in the copy paper conveyance direction 31 by a distance l4 from the axes of the pins 67a and 67b. This prevents the interlocking shaft 63 from rotating counterclockwise in FIG. 3 around the pins 67a and 67b due to the weight of the support frame 60.

Assume that a paper jam occurs in the copy paper transport path 13. In this case, the operating lever 64 should be moved to the pin 67.
By rotating the support frame 60 around the support shaft 62 in the direction of the arrow 68, the support frame 60 is rotated clockwise in FIG. 1 around the support shaft 62. Therefore, when a paper jam occurs in the copy paper transport path 13, the copy paper transport path 13 can be easily opened, and therefore the copy paper jammed in the copy paper transport path 13 can be easily taken out. can.

In addition, in the process of rotating the support frame 60 around the support shaft 62 to open the copy paper transport path 13, since one end of the lever 34 is connected to the spring 36, the lever 34 is rotated around the pin 35. The shaft 33 comes into contact with the upper part of the elongated hole 32. Therefore, the support frame 60 will not suddenly rotate around the support shaft 62 due to its own weight during the rotation operation and will not fall. Therefore, it is possible to prevent the hand from being caught between the support frame 60 and the bottom part 1c of the body 1, and
This prevents the support frame 60 from being damaged by a large impact due to a sudden fall.

After removing the jammed copy paper from the copy paper transport path 13, move the operating lever 64 to the pin 67.
a, 67b in the clockwise direction of FIG. As a result, the interlocking shaft 63 comes into contact with the lower surface of the bottom portion 60e, returning to the state shown in FIG. 3. In this rotation operation using the operating lever 64, the support frame 60 is urged upward by the spring 36, so that the support frame 60 can be rotated upward with a relatively small force.

Note that the spring force of the spring 36 is determined by the distance l5 between the pin 35 and the shaft 33 in the lever 34, and the distance l6 between the connecting positions of the shaft 33 and the spring 36.
(see Figure 2) by adjusting the ratio.

As described above, according to the present invention, the upper and lower pairs of rollers 25a, 25b,
26a, 26b, 27a, 27b, 28a, 28
b, 29a, 29b, the lower roller 25
a, 26b, 27b, 28b, 29b on the support frame 6
0, and the transport direction 3 of this support frame 60
One end of the support frame 60 can be rotated around an axis perpendicular to the transport direction 31 and the other end can be opened downward, and the support frame 60 can be opened and closed by rotating the lever 64. Therefore, the copy paper conveyance path can be easily opened when a copy paper jam occurs. Furthermore, in the present invention, since the lower roller of the pair of rollers extending over the entire length of the copy paper conveyance path is pivotally supported on the support frame 60, it is possible to open the entire length of the copy paper conveyance path. Therefore, the jammed copy paper can be easily taken out.

In particular, with the present invention, the operator can press the lever 6 with one hand.
The copy paper transport path can be opened and closed by operating 4, thus improving operability, and the present invention does not require the operation of pushing down the upper roller as described above in connection with the prior art. This is no longer necessary, and requires only a small operating force compared to operating a so-called snap-in type elastic engagement member, which also improves operability.

Furthermore, by gently rotating the lever 64 by the operator, even when the weight of the support frame 60 is relatively large, generation of a large impact force can be prevented. This is convenient for maintaining good copy quality of the machine.

The sliding contact piece 63 maintains a predetermined posture on either the upstream side or the downstream side of the conveyance direction 31 with respect to the rotational axis of the lever 64, thereby achieving the function of conveying the copy paper. In addition, the configuration can be simplified.

[Brief explanation of drawings]

FIG. 1 is a simplified sectional view of an embodiment of the present invention, FIG. 2 is a perspective view of the support frame 60, and FIG. 3 is a front view of the vicinity of the locking protrusion 61 of the support frame 60. 1... Body, 13... Copy paper conveyance path, 25a,
25b...Conveyance roller, 26a, 26b...Feeding conveyance roller, 27a, 27b...Peeling roller, 28a, 28b...Fixing roller, 29a, 2
9b... Discharge roller, 32... Elongated hole, 36... Spring, 60... Support frame, 62... Support shaft, 63... Interlocking shaft, 64... Operation lever.

Claims (1)

[Claims for Utility Model Registration] (1) Copy paper is transferred to at least one pair of upper and lower rollers 25a, 25b, 26a, 26b, 27.
a, 27b, 28a, 28b, 29a, 29b
In a roller support device for an electrostatic copying machine that conveys a copy paper conveyance path along a conveyance direction 31 by means of a roller support device for an electrostatic copying machine, the lower rollers 25b, 26b, 2 of the pair of rollers extending over the entire length of the copy paper conveyance path are
7b, 28b, 29b are pivotally supported, and the transport direction 31
a support frame 60 connected to the machine body so that one end thereof can rotate around an axis perpendicular to the conveyance direction 31 and the other end thereof in the conveyance direction 31 can open downward; and the other side of the support frame 60 A lever 64 near the end is rotatable around an axis perpendicular to the transport direction 31 and whose lower end is pivoted to the machine body 1; and a lever 64 provided on the lever 64 and extending along the transport direction 31 of the support frame 60 and a sliding contact piece 63 that comes into sliding contact with the sliding contact surface 60e, and the sliding contact piece 63 is attached to the support frame 60 on either the upstream side or the downstream side of the conveyance direction 31 with respect to the rotation axis of the lever 64. An electrostatic copying machine characterized in that the copy paper is conveyed by contacting the formed locking protrusion 61 and maintaining a predetermined posture, and the support frame 60 is opened on either side. Roller support device. (2) One of the lower rollers is the fixing roller 28b.
The support frame 60 includes the fixing roller 28b.
A long hole 32 through which the shaft 33 is inserted is formed to extend vertically, a support lever 34 that supports the shaft 33 is pivotally supported on a support frame 60, and the fixing roller 28b is vertically extended along the long hole 32. The support lever 34 is provided so as to be freely displaceable, and is biased by a spring 36 in a direction in which the fixing roller 28b is displaced upward, and when the support frame 60 is closed, the fixing roller 2
The shaft 33 of 8b does not contact the upper part of the elongated hole 32, and the fixing roller 28b contacts the other fixing roller 28a of the pair, and when the support frame 60 is open, the shaft 33 A roller support device for an electrostatic copying machine according to claim 1, wherein the roller support device is in contact with the upper part of the elongated hole 32.