JP2828269B2 - Paper handling mechanism of printer using continuous recording paper - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a printer for forming an image on continuous recording paper, and a fixing position of the continuous recording paper and a transfer position from a photosensitive drum during standby for printing. The present invention relates to a paper panning mechanism for a printer using continuous recording paper that is retracted from the printer.

2. Description of the Related Art A so-called electrophotographic method in which a latent image is formed by exposing a photoreceptor on the surface of a photosensitive drum, toner is adhered to the latent image and developed, and the toner is transferred to recording paper and fixed by a fixing device. An electrophotographic printer that prints information on the same continuous recording paper as that used in a conventional line printer is one of the image forming apparatuses that use the image forming apparatus.

The continuous recording paper is a so-called fan-hold paper, which is a folded continuous paper with a perforated hole (hereinafter simply abbreviated as continuous paper), and the folded portion is a perforation so as to be easily cut.

By the way, there are various fixing methods for fixing toner on recording paper (continuous paper) in electrophotography, such as a method of fusing by heating, a method of using a solvent, and a method of using pressure. A method by heat fusion which is considered to be reliable is generally used. Among the methods using heat fusing, a method using a so-called heat roll fixing method in which an unfixed recording paper is pressed against a heated roller (heat roller) and the toner is heated and fused by heat applied from the heat roller. There are many.

The heat roll fixing is performed by forming a fixing roller pair by opposing a heat roller and a backup roller that are heated to a high temperature, and sandwiching the recording paper between the fixing roller pair to apply a predetermined pressure to the heat roller. The fixing roller is heated by a heat roller to fix the recording paper. Usually, the rotation of the fixing roller pair also drives the conveyance of the recording paper.

This heat roll fixing is often used also in an electrophotographic printer using continuous paper as recording paper.

On the other hand, in an electrophotographic printer using continuous paper as the recording paper, since the exposure position and the transfer position are different, to start printing from a fixed position from the perforation of the continuous paper, the continuous paper must be It is necessary to move the photosensitive drum relatively to perform cueing. At this time, the continuous paper may damage or wear the photoreceptor on the surface of the photosensitive drum, or the continuous paper may become dirty with residual toner on the photosensitive drum surface. In some cases, the transfer charger is retractable from the transfer operation position so as to separate the recording paper from the photosensitive drum.
In the case where the recording paper is fixed by heat roll fixing on continuous paper, if the recording paper (continuous paper) is sandwiched between the heat roller and the pressing roller during printing standby, the same portion of the recording paper is heated by heat applied from the heat roller. It is necessary to configure one of the rollers of the fixing roll pair to be retractable so that the recording paper does not come in contact with the heat roller during printing standby, because problems such as causing burnt blisters may occur. is there.

Further, dust generated at the time of forming the perforation holes and perforations adheres to the surface of the continuous paper, and the dust accumulates on the transfer charger or adheres to the surface of the photosensitive drum to cause a problem. The paper dust brush is arranged on the continuous paper introduction side from the transfer section, and the paper dust brush is configured to be in contact with the continuous paper, and to be rotated in a direction opposite to the transport direction to perform brushing to remove dust. You.

[Problems of the Related Art] However, if the transfer charger and the roller of the fixing roll pair are retracted from the transfer operation position and the fixing operation position, respectively, during standby for printing, the continuous paper cannot be held at the predetermined position. For this reason, there has been a problem that the continuous paper moves in the reverse direction due to the force applied by the brushing of the paper dust brush, and the start position is deviated when printing is resumed.

SUMMARY OF THE INVENTION In view of the above-described circumstances, the present invention allows the continuous recording paper to move from a predetermined position even when the transfer charger and the fixing roll pair are retracted from the transfer operation position and the fixing operation position during printing standby. It is an object of the present invention to provide a paper handling mechanism of a printer using continuous recording paper that enables printing to be resumed from a correct position without causing a problem.

[Means for Solving the Problems] To achieve the above object, a paper handling mechanism of a printer using continuous recording paper according to claim 1 includes: (a) a paper dust brush near a continuous recording paper introduction portion; (B) at least one roller of the fixing roller pair can be retracted from the fixing operation position, and (c) the transfer charger can be retracted from the transfer position. d) The retracting roller of the pair of fixing rollers, the transfer charger, and the paper dust brush are retracted at the time of printing standby by a cam rotated by one driving means, and restored at the start of printing.

[Embodiment of the Invention] FIG. 1 shows a laser beam printer device using fan-hold paper, which is continuous paper, as recording paper. The input from a computer or the like is printed on fan-hold paper 20 by electrophotography and output. Things.

Around the photosensitive drum 1, a toner cleaning unit 2
A static elimination unit 3, a charging unit 4, a scanning optical system 5 for guiding a laser beam onto the photosensitive drum 1, a developing unit 6, and a transfer unit 7 are arranged in a predetermined order along the rotation direction of the drum 1. 1, a paper dust brush pair 40 composed of a pair of upper and lower paper dust brushes 41 and 42 is arranged on the introduction side (right side in FIG. 1) of the fan hold paper 20. Further, the fixing unit 8 is arranged forward in the conveying direction of the fan bold paper 20, and the tension applying mechanism 9 is arranged in the conveying path of the fan hold paper 20 from the photosensitive drum 1 to the fixing unit 8.

Then, the surface of the photosensitive drum 1 is main-scanned (exposed) in the rotation axis direction of the photosensitive drum 1 and the photosensitive drum 1 is rotated (sub-scanned) by a laser beam from the scanning optical system 5. The latent image formed on one surface is developed into a toner image, and the toner image is transferred to the fan bold paper 20 cleaned by the paper dust brush pair 40 by the transfer unit 7 and the fixing unit 8 transfers the toner image to the fan bold paper. The image is fixed on the toner image 20 and output. In addition, the tension applying mechanism 9 moves the endless belt 91 having a projection fitted into the feed hole at the side end of the fan hold paper 20 to the fan hold paper 20.
And is provided so as to be able to circulate with a predetermined resistance in accordance with the transport path of the fan holding paper 20. By applying a predetermined tension to the fan hold paper 20 transported and driven by the fixing unit 8, the skew is prevented from occurring. It works.

The paper dust brush pair 40 is formed by vertically disposing cylindrical paper dust brushes 41 and 42 that are longer than the width of the fan hold paper 20, and both paper dust brushes 41 and 42 are sandwiched between the two and pass through. The fan hold paper 20 is rotatably driven in a direction opposite to the conveying direction, and removes dust by sweeping the upper and lower surfaces (front and back) of the fan hold paper 20.

As shown in FIGS. 2 and 3, the lower paper dust brush 42 is provided such that a shaft 42A is rotatably supported by a bracket 104 erected on the chassis 100. As a result, the fan drive paper 20 is driven to rotate in the direction opposite to the transport direction of the fan hold paper 20 as described above.

The upper paper dust brush 41 has its shaft 41A rotatably held by left and right arms 43 that are pivotally supported by a bracket 104 at the rear end.

The other end of the arm 43 is connected to the chassis 100 by a spring 44 as shown in FIG. 4, and the arm 43 is moved downward (ie, toward the lower paper dust brush 42) by the pulling force of the spring 44. The swing is biased. Arm 43
A lever 45 is fixed to one end of an arm shaft 104A, which is a pivot point for pivotally supporting the arm 43 to the chassis 100, so that the lever 45 cannot rotate relative to the arm 43 at a predetermined included angle.

A lever operating arm 46 having one end fixed to a connecting shaft 105A rotatably disposed on a bracket 105 fixed to the chassis 100 is disposed below the lever 45, and the lever 45 is biased by a spring 44. Then, the swinging is restricted by contacting the upper surface of the lever operation arm 46. Therefore, the position of the lever operation arm 46 (the connection shaft 105A
The position of the lever 45, that is, the position of the paper dust brush 41 via the arm 43, is defined by the swing angle around the center.

A crank-shaped follower arm 105B is fixed to the other end of the connection shaft 105A, and the tip of the follower arm 105B is mounted on the chassis 100 and driven by a second cam 13 described later to move the front and rear of the laser beam printer. It is fitted in a cam hole 103C opened in a vertical portion of the slide plate 103 which slides in the direction. The cam hole 103C is continuous in the sliding direction of the slide plate 103 while its forming position is changed in a predetermined relationship up and down. Therefore, when the slide plate 103 slides, the tip of the follower arm 105B moves up and down accordingly. The vertical movement causes the paper dust brush 41 to swing up and down via the connecting shaft 105A, the lever operating arm 46 and the lever 45.

Then, when the paper dust brush 41 is below (FIG. 4), the fan hold paper 20 is sandwiched between the paper dust brush 42 and the surface of the fan hold paper 20 is brushed with the two paper dust brushes 41 and 42. Remove adhering dust. When the paper powder brush 41 is swung upward (fifth illustration), the paper dust brush 41 is completely separated from the surface of the fan hold paper 20.
The rotation of the paper dust brush 41 is performed by engaging a gear (not shown) fixed to one end of the shaft 41A with the same drive source as the rotation of the paper dust brush 42. When the paper dust brush 41 swings upward, the gears are disengaged and the rotational driving force is not transmitted, so that the rotation of the paper dust brush 41 is stopped.

The transfer unit 7 includes the photosensitive drum 1 as shown in FIGS.
Arm with a corona charger 71 of approximately the same length as
The photosensitive drum 1 is held in parallel with the photosensitive drum 1 at a predetermined interval.

The arm 72 is pivotally supported at a fulcrum 74 on a bracket 101 erected on a chassis 100 of the laser beam printer. The arm 72 and a predetermined position of the bracket 101 are connected by a tension spring 75, and the tension spring 75 attaches the arm 72 to the side where the corona charger 71 holding the arm 72 is at the transfer operation position with respect to the photosensitive drum 1. I'm going.

A cam follower 73 is rotatably provided below one of the arms 72, and the cam follower 73 is fixed to an upper surface of a slide plate 103 slidable in the front-rear direction of the laser beam printer. By operating the arm 72, the arm 72 is driven to swing against the tension urging force of the tension spring 75. The swing of the arm 72 causes the corona charger 71 to move the photosensitive drum 1
, And swings from the transfer operation position to the retracted position.

Further, a paper pressing roller 76 is rotatably arranged at the tip of the arm 72. The paper holding roller 76 is a corona charger.
When the corona charger 71 is in the transfer operation position, it does not come into contact with the upper surface of the fan hold paper 20, and the arm 72 When the corona charger 71 retreats from the transfer operation position due to the swing of the roller, the corona charger 71 comes into contact with the upper surface of the fan hold paper 20 and pulls down the fan hold paper 20 as the corona charger 71 retreats (fan hold). The paper 20 acts to separate the paper 20 from the photosensitive drum 1).

With the above configuration, when the corona charger 71 retreats downward due to the swing of the arm 72, the charge of the fan hold paper 20 is weakened even when the voltage is applied to the corona charger 71, and further, the paper pressing roller 76 As a result, the fan hold paper 20 is separated from the photosensitive drum 1 and is brought into a non-contact state, so that transfer is not possible.

The fixing unit 8 includes a heat roller 81A and a backup roller 8
A fixing roll pair 81 having the upper and lower fixing rolls 1B opposed to each other is arranged in a direction orthogonal to the conveying direction of the fan hold paper 20.

The upper heat roller 81A is a cylindrical roller,
Both ends thereof are rotatably held by a chassis of the laser beam printer device, and a heating element such as a halogen lamp is inserted therein to be heated to a predetermined temperature. One end is connected to a rotation driving means (not shown) via a clutch. The rotation driving means rotates the fan hold paper 20 at a rotational speed synchronized with the peripheral speed of the photosensitive drum 1. It is designed to be rotationally driven. The clutch is controlled to be connected and disconnected by a control unit (not shown) that controls the entire laser beam printer, that is, the rotation of the heat roller 81A is controlled independently of the swing of a backup roller described later. The lower backup roller 81B has a lever 84 which is driven to swing up and down by rotation of a cam 83, and a tension spring.
Both ends are held by arms 86 connected by 85.

The lever 84 and the arm 786 are pivotally supported by the chassis 100 of the contact laser beam printer so as to be able to swing at the same pivot point 87, and a cam follower 84A is provided at the tip of the lever 84.
The cam follower 84A comes into contact with the upper side of the side edge of the cam 83 by the weight of the lever 84 / arm 86 and the backup roller 81B.

The arm 86 is connected at its tip to a predetermined position of a lever 84 by a tension spring 85, and the tension spring 85 urges the arm 86 and the lever 84 in a direction in which the angle between them becomes narrower.

The cam 83 is a substantially heart-shaped eccentric cam,
It is fixed to a rotatable shaft 11 via a bearing on a U-shaped bracket 102 that is fixed upright at 0.

When the contact position of the cam 83 with the cam follower 84A is at the top dead center (FIG. 2), the arm 86 swings upward through the tension spring 85 by the swing of the lever 84, and the backup roller 81B Is pressed by the heat roller 81A with a predetermined force by the tension spring 85 to enter a fixing operation state, and heats the unfixed recording paper (fan hold paper 20) sandwiched between the rollers 81A and A1B, thereby causing the fan hold. paper
In addition to fixing toner on the fan 20, the fan-hold paper 20 is transported and driven by the rotation of the heat roller 81A.
When the contact position of the cam 83 with the cam follower 84A is at the bottom dead center (FIG. 7), the backup roller 81B is a retracted position where the outer peripheral surface is separated from the heat roller 81A by a predetermined distance and the fixing operation is not performed. It is. That is, the rotation of the cam 83 allows the backup roller 81B to swing between the fixing operation position and the retracted position.

The shaft 11 has a second cam 13 and a gear 12 in addition to the cam 83.
The gear 12 meshes with a gear (not shown) fitted and fixed to a spindle of a paper handling motor 10 which is a flange-type gear motor fixed to one side surface of the bracket 102. The paper handling motor 10 is driven to rotate. That is, the swing driving of the backup roller 81B is performed by the rotation of the paper handling motor 10.

The rotation of the paper handling motor 10 is controlled by a control unit of the entire apparatus.

The second cam 13 is an eccentric cam substantially similar to the cam 83 as shown in an enlarged view in FIG. 6, and a cam follower rotatably provided at the tip of the gear arm 14 is provided on the peripheral side surface of the second cam 13.
14A is in contact.

The gear arm 14 has one end fixed to a side surface of a gear 15 rotatably fitted to an arm shaft 16 erected on a bracket 102 in parallel with the shaft 11.
The gear 15 is rotated by the swing of the gear.

The gear 15 meshes with a gear 18 rotatably fitted to a lever shaft 17 erected on the bracket 102 in parallel with the shaft 11 and the arm shaft 16.

The gear 18 has a U-shaped notch 19A formed at the tip thereof, and a lever 19 is fixed to the notch 19A.
The operation bar 103A fixed to the rear end of the slide plate 103 is fitted and engaged.

The slide plate 103 is installed by fitting a guide shaft 104 erected on the chassis 100 into a guide elongated hole 103B formed in the plane portion thereof, and is slidable in the front-rear direction of the laser beam printer. Has become. or,
One (rear side) guide shaft 104 and the vicinity of the rear end thereof are connected by a tension spring 31, and the tension spring 31 urges the slide plate 103 forward.

With the above configuration, the slide plate 103 is urged forward by the tension spring 31, and the operation bar 103 </ b> A of the slide plate 103 swings in the direction in which the lever 19 and its tip become forward, and the gear 18 and the gear 15 pass through. In this manner, the gear arm 14 is swung in the direction in which the tip is on the rear side, and the cam follower 14A provided at the tip is urged against the cam surface of the second cam 13. In other words, the cam follower 14A is pulled by the second cam 13 by the tension of the tension spring 31.
Therefore, the rotation of the second cam 13 causes the slide plate 103 to slide back and forth.

Further, two disc-shaped first and second sensor plates 51 and 52 are fixed to the shaft 11 on one end side protruding outward from the bracket 102. Two sensors 61 and 62 are fixed to a support plate 102A that is bent at right angles to the wall surface of the bracket 102 so as to detect the respective outer peripheral portions of the sensor plates 51 and 52. The sensors 61 and 62 are so-called photo-interrupters in which a light-emitting unit and a light-receiving unit are arranged opposite to each end of a U-shaped frame.
A notch formed at a predetermined position of 51 or 52 is detected to output a signal.

Since the sensor plates 51 and 52 are fixed to the shaft 11, the rotation thereof is performed by the cam 83 fixed to the shaft 11.
And the second cam 13 are completely synchronized with each other. When the sensors 61 and 62 detect notches formed at arbitrary positions of the sensor plates 51 and 52, the cams 83 and the second cams described above are detected.
13 (mechanism driven by 13 (paper powder brush vs. 40, transfer unit 7)
The operation state of the fixing unit 8) can be detected.

Here, one of the first sensor plates 51 immediately after the backup roller 81B starts ascending (when the rotation angles of the cam 83 and the second cam 134 are 45 °) and the above-mentioned cam 83 and the second cam 13 When the mechanical units (paper powder brush pair 40, transfer unit 7, and fixing unit 8) driven by the motor are all operated (the rotation angle of the shaft 11, that is, the rotation angle of the cam 83 and the second cam 13 is 235)
(At the time of {-265}), a notch is formed at the position and width at which the signal is output (that is, the notch is formed at two places), and the other second sample plate 52 is provided with a backup roller. When 81B is completely retracted (when the rotation angle of the cam 83 and the second cam 13 is 0 ° to approximately 20 ° and approximately 340 ° to 0 °), a notch is formed at the position and width at which a signal is output. ing.

Thus, in the laser beam printer configured as described above, at the time of printing standby, the gear motor 10 is driven to retract the backup roller 81B of the fixing roll pair 81 to separate the fan hold paper 20 from the heat roller 81A,
The corona charger 71 of the transfer unit 7 is retracted from the transfer operation position, and the paper dust brush 41 above the paper dust brush pair 40 is retracted upward. This prevents a problem that occurs when the same portion of the fan hold paper 20 is heated by the heat roller 81A during the print standby, and also keeps the fan hold paper 20 stopped at the start of printing (at the time of restart). Even when the photosensitive drum 1 rotates, the fan hold paper 20
Can be prevented from contacting the photosensitive drum 1, and the fan hold paper 20 can move in the opposite direction due to the force applied in the opposite direction to the feed direction applied by the paper dust brush pair 40. It can be prevented.

The operation timing of each mechanism is configured as shown in the timing chart of FIG. 8. Next, the operation timing will be described with reference to FIG. The horizontal axis in the figure is the shaft 11
(Cam 83 and second cam 13).

When printing start is instructed from the control unit of the entire apparatus (not shown), rotation of the paper handling motor 10 is started,
By driving the shaft 11 to rotate, the cam 83 and the second cam 13 are rotated. Around this time, the main motor (the motor that drives the photosensitive drum 1 to rotate) also starts rotating.

Shaft by rotation of paper handling motor 10
When 11 rotates, the backup roller 81B of the fixing roll 81 driven by the cam 83 starts to rise from the retracted position. At this time, the second sensor 62 detecting the second sensor plate 52 is outputting a signal, and the shaft 11 (the cam 8
When the rotation angle of 3) becomes approximately 20 °, it is confirmed that this signal is interrupted and the backup roller 81B starts to ascend from the retracted position. Further, the shaft 11 (the cam 83) rotates and the rotation angle 45 When ゜ is reached, a signal is output from the sensor 61 detecting the first sensor plate 51. In response to this signal, exposure of the photosensitive drum 1 by the laser beam from the scanning optical system 5 is started. Also, after a predetermined time from this signal (after 0.73 seconds)
In addition, a clutch of a rotation drive system is connected to the heat roller 81A of the fixing unit 8. Note that 0.73 seconds after the start of the exposure is a time during which the position of the surface of the photosensitive drum 1 exposed by the laser beam reaches the transfer position (transfer unit 7) by the rotation of the photosensitive drum 1.

When the rotation angle of the shaft 11 (cam 83) becomes approximately 190 °, the backup roller 81B is pressed by the heat roller 81A to enter a fixing state, and the corona charger 71 of the transfer unit 7 moves upward substantially in synchronization with this. Start rocking. The corona charger 71 is in the transfer operation position when the rotation angle of the cam 83 is approximately 215 °.

When the rotation angle of the shaft 11 is approximately 210 °, the paper dust brush 41 above the paper dust brush pair 40 is driven by the slide plate 103 that is moved and driven by the second cam 13, and starts swinging downward. The paper powder brush 41 has a rotation angle of the shaft 11 of 235.
When it becomes ゜, it becomes the predetermined position (cleaning action position).

That is, when the rotation angle of the shaft 11 becomes 235 °, all the mechanical units (the paper powder brush pair 40, the transfer unit 7, and the fixing unit 8) driven by the cam 83 and the second cam 13 are in the operating state. It has become. This state is maintained until the rotation angle of the shaft 11 becomes 265 °.

The signal from the first sensor 51 when the rotation angle of the shaft 11 is 45 ° when the rotation angle of the shaft 11, which is substantially the center of the range in which all of the mechanisms are in the operating state, is 250 °. 0.73 seconds after the output, the fixing unit 8
The clutch of the rotary drive system to A is connected, and heat roller 8
1A starts rotating to start feeding the fan hold paper 20 sandwiched between the fixing roll pair 81. That is, at the same time when the exposure start position on the surface of the photosensitive drum 1 reaches the transfer unit 7 via the developing unit 6, the fan hold paper 20 is sent to perform printing (transfer).

The paper handling motor 10 is stopped during this printing.

At the end of printing, 0.73 seconds after the exposure of the photosensitive drum 1 by the laser beam from the scanning optical system 5 is completed, the clutch of the rotary drive system to the heat roller 81A of the fixing unit 8 is released, and the fixing is performed. Fan-hold paper 20 with roll pair 81
Is stopped. Prior to this, the rotation of the paper handling motor 10 is resumed and the fan hold paper 20
When the feed is stopped, the rotation angle of the shaft 11 is 265 °.

Hereinafter, each mechanism section retracts in the reverse order as described above in accordance with the rotation of the shaft 11. That is, when the rotation angle of the shaft 11 becomes 265 °, the paper dust brush 41 above the paper dust brush pair 40 starts swinging (retreating) upward, and when the rotation angle is approximately 290 °, the transfer unit 7 Of the corona charger 71 starts evacuation,
At 0 °, the retraction of the backup roller 81B of the fixing roll pair 81 starts. When the rotation angle becomes approximately 340 °, a signal is output from the second sensor 62 to confirm that the backup roller 81B is retracted.

The rotation drive of the photosensitive drum 1 by the main motor is stopped before and after the backup roller 81B is retracted. Then, at a rotation angle of 360 °, the paper handling motor 10 stops and prepares for printing resumption.

In the above embodiment, the cam 83 for retracting the backup roller 81B and the second cam 13 for swinging (retracting and returning) the corona charger 71 and the paper powder brush 41 are configured as different cams. It may be configured to be driven by a cam.

In the above configuration, the heat roller of the fixing roll pair 81 is used.
Although the backup roller 81B is configured to be retractable while rotating the 81A, the invention is not limited to this.For example, the backup roller 81B is configured to be rotatable and the heat roller 81A is configured to be retractable. It is possible.

Next, a second embodiment having a configuration different from that of the first embodiment will be described with reference to FIGS. 9 to 14. The parts having the same functions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment is different from the first embodiment in that the fixing unit 8 (heat roller 81A and backup roller 81B), the cam 83 that swings the backup roller 81B, and the slide plate 1
The second cam 13 for slidingly driving the 03, the paper handling motor 10 and the like are integrally configured as a fixing unit,
This unit is configured to be mounted on the chassis 100 of the apparatus at a time.

As shown in FIG. 9, which is a plan view of the fixing unit (the fixing unit 8 is not shown), the cam 83 and the second cam 1 are provided.
3, a single shaft 88 having a length substantially corresponding to the width of the device in which the first sensor plate 51 and the second sensor plate 52 are fixed at predetermined positions, and bend upright on both sides of the unit chassis 200. The motor bracket is rotatably supported by the side plate portions 201, 201 formed in this way, and the shaft 88 is erected perpendicularly to the shaft 88 near one side of the unit chassis 200.
It is configured to be rotatable by the paper handling motor 10 mounted on the 202.

Cams 83 for swinging and driving the backup roller of the fixing unit (not shown) are provided in the vicinity of both ends of the shaft 88 in the same shape, respectively, so that the backup roller can be stably swingably driven at both ends thereof. I have.

The second cam 13, the first sensor plate 51, and the second sensor plate 52 are provided side by side near the center of the shaft 88.

Further, a sensor holder 203 is provided upright on the rear side of the unit chassis 200 at the position where the first sensor plate 51 and the second sensor plate 52 are arranged, and the first sensor plate 51 and the second sensor plate of the sensor holder 203 are provided. A sensor 61 and a second sensor 62 are mounted at positions corresponding to 52, respectively.

Note that a recording paper detection mechanism 300 is provided near the center from the position where the second sensor plate 52 and the second sensor 62 are disposed, and the sensor 301 of the recording paper detection mechanism 300 is also mounted on the sensor holder 20.
3 is arranged side by side with the sensor 61 and the second sensor 62.

The paper handling motor 10 is a flange type DC motor, and is fixed to the motor bracket 202 as described above, and a gear 10B fixed to the spindle 10A protruding through the motor bracket 202 corresponds to the shaft 88. The shaft 88 is engaged with the gear 12 fixed at the position, and the shaft 88 is driven to rotate by the paper handling motor 10.

Below the second cam 13 fixing position of the shaft 88, the tenth
As shown in FIGS. 11 to 11, an L-shaped lever 204 is swingable in the front-rear direction, and is pivotally supported by the unit chassis 200 at the intersection thereof.

The lever 204 has a cam follower 205 rotatably mounted on the tip of a lower arm 204A that is substantially horizontal, and slides back and forth with the tip of an upper arm 204B that is substantially upright as in the first embodiment. As far as possible, the slide plate 103 arranged on the chassis 100 is swingably connected to the upper end of the vertical arm 103 at the rear end.

Here, the cam follower 205 is located at a position corresponding to the second cam 13, and the slide plate 103 is urged forward by the spring 31.
Is oscillated and the cam follower 205 is urged against the outer peripheral cam surface of the second cam 13, and therefore, the slide plate 10 is displaced with the displacement of the outer peripheral cam surface accompanying the rotation of the second cam 13.
Reference numeral 3 denotes a device that is driven to slide back and forth.

At the front end of the slide plate 103, a lever 10 supported by a bracket 106 fixed to the chassis 100 so as to be swingable in a horizontal direction (swingable about a vertical axis).
One end of 7 is fitted, and the lever 107 is driven to swing along with the slide of the slide plate 103. The other end of the lever 107 is attached to the same bracket 106 that supports the lever 107. The shaft 1 is attached to one end of a shaft 108 rotatably supported with its axis horizontal and in the left-right direction.
A fitting projection 108A projecting perpendicularly to 08 is fitted, and the shaft 108 is driven to rotate by the swing of the lever 107.

At the other end of the shaft 108, an arm 108B extends toward the front side of the device, and the arm 108B
With the rotation of 108, the tip swings up and down.

That is, by moving the slide plate 103 in the front-rear direction, the arm 108B is driven to swing its tip up and down.

The tip of the arm 108 corresponds to the side end position of the paper powder brush pair 40.

The paper powder brush pair 40 has a side view as shown in FIG.
An upper holder 44 is pivotally supported at the upper rear end of the box-shaped lower holder 43 formed of a synthetic resin so as to be swingable, and a paper powder brush 42 is rotatably supported at both ends of the lower holder 43. The paper powder brush 41 is rotatably supported by the upper holder 44. An operation projection 44A is formed on the side end surface of the upper holder 44 on the side corresponding to the end of the arm 108B, and an operation portion 108C at the tip of the arm 108B abuts on the arc-shaped lower surface of the operation projection 44A. It has become.

Therefore, when the arm 108B swings upward, the operating portion 108C at the tip pushes up the operating protrusion 44A, and the upper holder 44B
The (paper dust brush 41) is driven to swing upward and retreat.

In addition, at both ends of the upper holder, an elastic portion 44B in a hiragana-like shape is integrally formed, and the upper surface of the elastic portion 44B is brought into contact with the frame of the apparatus, and the upper holder 44B is returned by the elastic deformation. Is pressed to the lower holder 43 side to bring the paper dust brush 41 into the operating position, and the upper holder 44 is swung upward against the urging force of the elastic portion 44B, so that the paper dust brush is
41 can be set as the evacuation position.

The transfer unit 7 includes a slide plate 10 as in the first embodiment.
The swing movement is performed by the slide movement of 3.

The corona charger 71 is held by an arm 72 pivotably supported by a shaft 74 communicating between brackets 110 and 111 erected at predetermined intervals on the left and right sides of the chassis 100, respectively.

At the opposite end of the arm 72 between the mounting portion of the corona charger 71 and the pivot point, the lower end of the bracket 10 fixed to the chassis is fixed.
The upper end of a tension spring 75 locked to 5 is locked, and the arm 72 is on the side where the corona charger 71 held by the tension spring 75 is at a transfer position with respect to a photosensitive drum (not shown). It is urged to swing.

Under the pivot point of the shaft 74 of the arm 72, a pin
73 is implanted horizontally, and when the pin 73 is operated by the upright end face of the operation portion 103A erected on the slide plate 103, the arm 72 swings against the tension urging force of the tension spring. It is designed to be driven. By the swing of the arm 72 by the operation member 103A of the slide plate 103, the corona charger 71 swings from the transfer operation position to the retracted position by a predetermined amount.

Further, a paper pressing roller 72A is supported in parallel with the corona charger 71 at a position forward of the arm 72 at a position where the corona charger 71 is supported. The paper pressing roller 72A acts to urge the recording paper (the fan hold paper 20 in the first embodiment) toward the transfer position of the photosensitive drum.

The same shaft 74 pivotally supporting the arm 72
Although not shown in detail, a roller arm 76 is pivotably supported.

The roller arm 76 has a paper holding roller at its front end.
76A is mounted rotatably, and the operation section 76B
Are formed.

The roller arm 76 is urged by a torsion spring (not shown in FIG. 14) wound around the shaft 74 so that the paper pressing roller 76A swings toward the corona charger 71, and both the paper pressing roller 76A and the paper pressing roller 76A are pressed. The roller 76A and the corona charger 71) have a predetermined positional relationship. The swing torque of the roller arm 76 by the torsion spring 77 is
The swing torque of the arm 72 by the tension spring 75 is set smaller than the swing torque.

That is, the roller arm 76 and the arm 72 are integrated in a predetermined positional relationship, and in this integrated state, the roller arm 76 and the arm 72 can swing about the shaft 88. Therefore, the slide plate
When the arm 72 is driven to swing by the operation unit 103A of the roller 103, the roller arm 76 also swings integrally while maintaining its positional relationship.
When the roller 76B is pressed downward in FIG.
Only swings against the urging force of the torsion spring 77,
The paper pressing roller 76A is separated upward from the corona charger 71 (that is, the relative positional relationship between the two changes).

When the corona charger 71 is in the transfer operation state, the roller arm 76 has its paper pressing roller 76A moved by the corona charger 71.
The position is closer to the photosensitive drum 1 on the side where the fan hold paper 20 is introduced, and at this time,
The fan hold paper 20 passes between the paper pressing roller 76A and the corona charger 71 and comes into contact with the transfer portion of the photosensitive drum 1 facing the corona charger 71.

At the time of printing standby, the corona charger 71 is moved to the retracted position by the swinging movement of the arm 72 by the sliding movement of the slide plate 103, and the charging of the fan hold paper 20 is weakened even when the voltage is applied while The fan hold paper 20 is separated from the photosensitive drum 1 by being pulled down by the paper pressing roller 76A, so that transfer is not possible.

Further, at a position corresponding to the operation portion 76B of the roller arm 76, a pressing lever 78A fixed to a shaft 78 provided forward of the shaft 74 is arranged.

The shaft 78 rotates in conjunction with the opening and closing of an upper component (upper lid) of the contact laser beam printer device via an interlock mechanism (not shown), and the rotation of the shaft 78 causes the pressing lever 78A to rotate by a roller arm. 76 operation unit 76B
Is pressed.

When the upper component is opened, the corona charger 71
In the retracted state, only the paper holding roller 76A swings upward, and the photosensitive drum and the paper holding roller 76A and the corona charger 71
The space between the fan hold paper 20 and the fan hold paper 20 can be easily set.

In this embodiment, as in the first embodiment, the paper handling motor 10 is driven during printing standby to retract the backup roller of the fixing device and heat the recording paper (fan hold paper 20). The corona charger 71 of the transfer unit 7 is retracted from the transfer operation position by moving the slide plate 103 apart from the roller,
Further, the paper dust brush 41 on the upper side of the paper dust brush pair 40 can be retracted upward.

The operations of these mechanisms may be performed at the same timing as in the first embodiment.

[Invention and Effect] As described above, according to the paper handling mechanism of the printer using continuous recording paper according to the present invention, during continuous printing, the continuous recording paper is retracted from the photosensitive drum and the heat roller in the transfer unit. In addition, the paper dust brush can be retracted by one driving means, so that the photosensitive drum can be prevented from being scratched or worn and troubles caused by the heat applied to the continuous recording paper. Does not move. Therefore, printing can be resumed from the correct position.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration of a printer provided with one embodiment of a paper handling mechanism of a printer using continuous recording paper according to the present invention, FIG. 2 is a side view of the paper handling mechanism, and FIG. FIG. 4 is an enlarged view of the paper dust brush portion, FIG. 5 is a view showing the operation state, FIG. 6 is an enlarged cross-sectional view taken along the line IV-IV of FIG. 3, and FIG. FIG. 8 is a diagram showing an operation state, FIG. 8 is a timing chart of operation, FIG. 9 is a plan view of the second embodiment, FIG.
10 is a sectional view taken along line II of FIG. 10, FIG. 12 is a sectional view taken along line II-II of FIG. 9, FIG. 13 is a sectional view taken along line III of FIG. 9, and FIG.
It is a V-IV sectional view. 10 Paper handling motor (drive means) 13 Second cam (cam) 40 Paper dust brush pair 41 Paper dust brush 71 Corona charger (transfer charger) 81 Fixing roller pair 81B …… Backup roller (retraction roller) 83… Cam 20… Fan hold paper (continuous recording paper)

Continuation of the front page (56) References JP-A-53-17340 (JP, A) JP-A-1-286879 (JP, A) JP-A-53-55128 (JP, A) JP-A-60-98849 (JP) (58) Field surveyed (Int. Cl. ⁶ , DB name) G03G 15/00 510-534 G03G 13/20 G03G 15/20-15/20 302 G03G 13/14-13/16 G03G 15/14-15/16 103 B41J 15/00-15/24 G03G 15/00 303 G03G 21/00 370-540 G03G 13/34 G03G 15/36

Claims (1)

(57) [Claims] In a printer for forming an image on a continuous recording sheet, a paper dust brush is disposed near a continuous recording sheet introduction portion so as to be retractable from a contact position with the continuous recording sheet. One of the rollers can be retracted from the fixing operation position, and the transfer charger can be retracted from the transfer position. The retracting roller, the transfer charger, and the paper dust brush of the fixing roller pair are driven to rotate by one drive unit. A paper handling mechanism for a printer using continuous recording paper, wherein the cam is retracted at the time of printing standby and restored at the start of printing.