JPS6156376A - Pressure fixing device - Google Patents

Abstract

PURPOSE:To make a titled device small in size by constituting it so that a pressure roll rolls and scans by crossing the recording form of an unfixed toner image stopped on a pressure receiving member, and a section dividing fixation is executed. CONSTITUTION:A range I is the first fixing area being equal to the roll width of a pressure roll 19, the a fixation is executed by the linear pressure of the roll 19 and a pressure receiving member 27 in the direction as indicated with an arrow of ABC-. Thereafter, the form 5 of the length of a linear pressure portion is brought to an advance feed by carrying rolls 36, 36, and the second section fixation, namely, the fixation of a range III of abc- is executed at the time of return rolling. By repeating successively this operation in ranges III, IV, the fixation is executed extending over the whole area of the form 5. In this way, a good pressure fixation can be executed by satisfying enough a necessary load per unit length, and by the rolling scan of the roll 19 of a small diameter and a small width. Accordingly, a total load required for the pressure fixation is decreased, and it is attained that the device is made small in size and light in weight. Also, wrinkles which are apt to be generated at the time of feeding a form are also prevented by adopting the section fixing system.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a pressure fixing device for a recording medium having a toner image on paper or the like. The present invention relates to a pressure fixing device that performs pressure fixing using a scanning pressure roll and is suitable as a fixing device for recording devices, printers, copying machines, and the like.

[Background of the invention]

Traditional fixing methods include heat chambers and heat rolls (7)
Although several systems have been put into practical use, all of them require a waiting time of several tens of seconds or several minutes before starting to use them. In recent years, flash fixing using a thermal light source or thermal radiation that does not require waiting time, and pressure fixing using a pressure roll have also been put into practical use, but the flash fixing method is expensive, and the pressure fixing method avoids increasing the size of the device. At present, there is no satisfaction in making the device smaller, waiting for questions and answers, lighter weight, lower price, etc.

In the above-mentioned pressure fixing method, paper with a toner image on its surface is usually passed between rotating high-load rolls, and the toner powder is pushed into the paper by pressure to obtain a fixing effect. It is necessary to apply a high load of about 40'Kg between the rolls on the long ICrn side, A4 short side (21
0 recommendation), in order to fix the inside of the paper of about B4 short side (257 ym), it is necessary to have a device that can withstand a strong load of approximately 800 kg, without causing any deflection of the roll against the effective paper being passed through. It is necessary to apply a uniform, evenly distributed load, and requires a rigid roll with a smooth outer surface and a constant diameter proportional to the roll length.

Also, if the effective length of the paper to be passed is made longer, the diameter of the roll will increase due to the above-mentioned reason. This increases the weight of the equipment and reduces the total
: ``Currently, it is difficult to make equipment smaller and lighter.

In addition, during the fusing process, the paper must be inserted correctly between the rotating pair of rolls so that the front edge of the paper is perpendicular to the direction of travel (the front edge of the paper is parallel to the tangent line of the rolls). However, there is a problem in that the paper enters the paper in a curved manner relative to the roll tangent line, and this causes wrinkles to easily occur on the paper surface during fixing and conveyance, and even causes a breakage phenomenon due to the wrinkles in the paper surface. In order to solve this problem, it is necessary to improve the accuracy of the device to ensure stability when the paper enters the device, but this has been accompanied by considerable difficulties.

[Purpose of the invention]

The present invention utilizes the advantages of the above-mentioned pressure fixing method while
The main purpose of this method is to fundamentally solve the above-mentioned problems, but it also makes it possible to downsize the fixing device, reduce the diameter of the roll, and reduce the pressurizing load, which in turn reduces the driving force. It is an object of the present invention to provide an improved pressure fixing device that can reduce the amount of energy used, enable the use of a small motor, and be satisfactory in terms of energy consumption.

[Summary of the invention]

In order to achieve the above object, the present invention performs segmented fixing by rolling and scanning a pressure roll across the recording paper on the upper surface of the recording paper having an unfixed toner image stopped on a pressure-receiving member. The gist of this device is to fix a recording paper carrying an unfixed toner image by applying pressure while the recording paper is being transported, and the recording paper is moved in a fixed direction while alternately transporting and stopping. an intermittent conveying means for conveying the recording sheet to the conveyance direction; a pressure receiving member having a flat upper surface disposed in a direction transverse to the conveyance direction for supporting and guiding the recording paper; a pressure roll having a relatively narrow width disposed so as to be able to roll and scan under pressure, and carrying the toner image across the recording paper during a stop period when the recording paper is intermittently conveyed; The pressure fixing device is characterized in that the unfixed toner image on the recording paper is fixed under pressure in sections by rolling and scanning the pressure roll on the surface of the recording paper.

[Embodiments of the invention]

1 to 10 show embodiments of the pressure fixing device according to the present invention, and FIG. 11 shows an eighth example of the device for implementing the conventional pressure fixing method.

In FIG. 11, reference numeral 1 denotes a drum having a dielectric layer on its surface, which is driven by a /J Luss motor (not shown) to rotate in the direction of the arrow. Reference numeral 2 denotes a recording head for forming an electrostatic latent image on the surface of the drum 1 in response to a recording signal. A plurality of them are arranged in the axial direction of the drum 1. A typical recording head uses a large number of needle-shaped electrodes arranged in a row.

3 is a developing device for developing the electrostatic latent image formed on the surface of the drum 1, and the developer used therein may be a two-component developer or a one-component developer.

When using a 1-component developer, for example,
It is preferable to develop using the developing method disclosed in Japanese Patent No.-32375. 4a and 4b are a pair of transport rolls that transport the recording paper 5 in the rotational direction of the drum 1, making it possible to transport the paper 5 at a speed that matches the circumferential speed of the drum 1.

Reference numeral 6 denotes a charger that transfers toner adhering to a latent image area formed by a recording signal by development onto the recording paper 5, and 7 a cleaner that cleans the drum after the transfer.

The above is a description up to the end of the transfer of a recording device capable of transferring to plain paper using the electrostatic recording method according to the prior art, in which a toner image before fixing is transferred and formed on the paper. This paper 5 is transported within the effective length of the drum 1 in the direction of the arrow as the drum 1 rotates, and has a length equal to or greater than the paper width and equal to the transport speed of the paper 5, similar to the transport roll pair 4a and 4b. The toner image passes through a large, high-load pressure fixing device having a pair of pressure rolls 8a and 8b that rotate at a circumferential speed, and at this time, the unfixed toner image is fixed under pressure onto the recording paper 5, and the paper 5 after fixing is removed from the machine. Niyu 1.1
．． 16□. (The fixing device capable of applying a high load to the paper surface as described above is suitable for an ultra-high speed recording device that can perform high speed printing, but it has the following drawbacks as described above in the conventional example.

The present invention eliminates the drawbacks of the conventional example, divides the paper into multiple parts, and performs pressure fixing repeatedly, thereby maintaining the same pressure load per unit length as in the conventional example, and shortening the paper. By using long and small diameter rolls, the entire device can be made smaller.
It is an object of the present invention to provide a pressure fixing device which is light in weight, has a simple structure, is free from the high precision of the device (for example, parallelism between fixing rolls of 8), and is i% superior in preventing wrinkles from occurring during the paper conveyance process.

FIG. 1 shows an apparatus according to an embodiment of the present invention, and parts common to the conventional apparatus shown in FIG. 7 are given the same reference numerals. In FIG. 1, a sheet of paper 5 having a toner image formed and transferred thereon in the same manner as in the conventional example is conveyed to the right in the figure, passes through a fixing device according to the present invention, and the toner image is fixed on the sheet of paper 5. and is ejected from the aircraft.

The pressure fixing device of the present invention will be described in detail below. In the fixing device located on the right side of FIG. 1, 11.
Reference numeral 12 denotes a carrier 1 that allows movement in the transverse direction perpendicular to the paper.
This is a guide rail that guides and holds 3. carrier 13
is coupled to a ninth drive connecting belt (or wire) 14 that enables reciprocating motion, and is wound around a rotatable pulley 15 supported by the main body frame, and is a drive rotation source (motor).
The receiver receives power from 16 and is capable of reciprocating in the vicinity of the paper across the width of the advancing paper.

As shown in detail in FIG. 2, the carrier 13 is equipped with a pressure roll 1 having a smooth outer peripheral surface with high hardness and good releasability via ball bearings or roller bearings 17 and 18.
9 is rotatably supported, and a rotary drive gear 20 is mounted on the shaft of the pressure roll 19. This gear 20
A gear 22 integrally coupled with another gear 21 that meshes with the gear 22 is rotatable on a support shaft 23.

The teeth of the rack 26 fixed to the side plates 24 and 25 of the main body are in meshing relationship with the gear 22, and the carrier 13
When the gear moves forward on the guide rail 11.12 between the side plates 24.25, the gear 22 meshing with the rack 26 rotates, and rotational driving force is transmitted to each gear in the gear train. Pressure roller/I/19 rolls on the paper 5 in the width direction without slipping.

On the other hand, the paper 5 is guided and supported by the smooth upper surface of the pressure-receiving member 27 disposed on the back side where there is no toner image, and is carried in and out without floating above the upper surface of the pressure-receiving member 27. It has become. The pressure receiving member 27 is made of a rigid material with a smooth upper surface without irregularities9, and its width is wider than the pressure roll width.
When the paper 5 is intermittently transported on the upper surface of the pressure-receiving member 27, an area on the paper 5 corresponding to the width of the roll is applied by the pressure roll 19, which rolls and scans in a direction crossing the transport direction, knowing when to stop. The pressure will be fixed in a segmented manner.

In order to maintain the pressurized state of the pressure receiving member 27 against the pressure roll 19, the pressure receiving member 27 is moved by the pressure springs 28 and 29.
7 is pushed upwards.

Note that instead of the one shown in the figure, a pressure receiving member 27 is fixedly disposed,
The pressure roll 19 full including the carrier 13 may be pressed against the upper surface of the pressure receiving member 27 using an appropriate pressure spring.

The paper 5 is placed on the upper surface of the pressure receiving member 27 over the movement range of the pressure roll 19 that can be rolled and scanned by the carrier 13.
In order to always receive uniform pressure, it is preferable to arrange the pressure receiving member 27 so that it can be automatically aligned as shown in FIGS. 4 to 7. That is, the rotating shaft 30.3 of the pressure receiving member 27 is positioned at a position that substantially coincides with the upper surface of the pressure receiving member 27.
1 are provided, each slot 32.3 in the side plate 24.25.
As a result, the pressure receiving member 27 can be self-centering, and a uniform load is applied over the entire transmission scanning range of the pressure roll 19.

To explain in detail the self-alignment of the pressure receiving member 27 according to the drawings, FIG. It is a cross-sectional view showing the state, and it is in a position where it can be pressurized.
There is 1 degree. The rotating shaft 31 forms the pivoting center on the home position side, and the rotating shaft 30 forms the pivoting center on the opposite side.
These rotation axes 30, 31 are connected to both side plates 24. ．． 2
It passes through 5. These rotating shafts 30 and 31 are fitted into slot holes 32 and 33, which have a width approximately equal to the diameter of the shaft, as shown in the figure on both sides, and fix the pressure member 27 to the pressure roll 19 from below, as shown by the arrow. The operating pressure is provided by springs 28,29.

The positional relationship shown in FIG. 4 is that on the home position side of the pressure receiving member 29, as shown in FIG. There is a minute gap shown by , and Δa = 0 in the slot 32 on the side plate 24 side. That is, when the pressurized row #19 in the carrier 13 that rolls and scans on the guide member 27 reaches the left side as shown in FIG.
The pressure receiving member 27 that is pressurized by the pressure roll 19
, a gap Δa is created above the slot 32 and the toner on the sheet portion 5 can be fixed with the necessary pressure.

The rigid flat surface of the pressure-receiving member 27 has few irregularities, so even if there is a slight twist in the flatness, the pressure-receiving member 27 can penetrate the both side plates due to the spring pressure indicated by the arrow from below in FIG. The pressure roll 19 is self-aligned as shown by the dashed arrow, with the rotating shafts 30 and 31 as the pivot center.
Maintaining a uniform contact relationship following the roll width on the bottom surface of the
The toner image on the paper 5 is pressed into the paper surface under ideal uniform pressure that is corrected moment by moment with respect to the transmission scanning of the pressure roll 19, thereby ensuring stable fixation.

With the above configuration, the upper surface of the pressure receiving member 27 can be automatically aligned with the lower surface of the rolling pressure roll 19, and when the paper 5 is present, the upper surface of the pressure receiving member 27 can be aligned with the lower surface of the pressure roll 19. A uniform line processing condition can be obtained. Note that the pressure receiving member 2
A pressure roll 19 is applied to the recording paper 5 that is stationary on a
The home position of is set at a position that is offset from the side edge of the paper by a length Δt shown in FIG.

The carrier 13 is connected to a belt 14 which is wound around the carrier 13 via a gooley 15, and is moved via the belt 14 by the drive of a drive motor 16.

In this case, the outer periphery of the pressure roll 19 is synchronously rolled by the driving force transmitted from the rack 26 through the tooth row over a length equal to the amount of movement of the carrier 13.
3 moves in the direction of the arrow shown in the figure by the power from the pressure motor 16. The pressure roll 19 is completely driven and rolls and scans the upper surface of the pressure receiving member 27 without sluggishing it.
Even when the linear dynamic pressure section at the bottom of the pressure roll 19 reaches the end of the recording paper 5, no external force is generated to horizontally move the paper 5 in the moving direction of the carrier 13. Therefore, the recording paper 5 remains completely stationary during the fixing operation.

As shown in FIG. 3, the paper 5 is subjected to linear pressure between the pressure receiving member 27 and the pressure roll 19 with effective feldspar having a roll width L1, and the pressure roll 19 sequentially presses the toner on the paper surface into the paper surface. While firmly fixing, the paper is rolled across the paper to the other end position, and the pressure fixing of the upper surface area of the paper 5 having the roll width L□ is completed.

The toner on the surface of the recording paper 5 whose back surface is in contact with the upper surface of the pressure receiving member 27 remains completely stationary, and the roll width is moved without moving the paper 5 or spilling out the toner retainer. Since the rectangular area surrounded by the side and the paper middle t as the other side has been fixed, the image toner existing within the range p1 is completely fixed on the paper surface.

The carrier 13 further moves from the left end of the paper 5 in the drawing, arrives at the position shown by the broken line in FIG. 4, and stops just in case.

In other words, the pressure roll 19 advances further into the paper by a distance t, similar to the home position side, and moves Δt so that the pressure roll 19 is reliably separated from the other end of the paper. Set.

With the carrier 13 in a stopped state, the paper 5 is transported from the position shown in FIG. 2 to the position shown in FIG. 3 by a length of 8 minutes corresponding to the roll width L1 by rotation of the transport roll pair 36° 37 in the direction of the arrow. Stop. Then the drive motor 16
Add to the reverse direction drive! The pressure roll 19 starts rolling in the return direction, rolls in the opposite direction to the forward movement, performs the same fixing as the forward movement, and rolls the paper 5 from the other end of the roll,
At the effective length of , the fixing of the second section is completed, and it returns to the home position and stops.

Subsequently, before starting the fixing of the third section, the paper is fed again according to the amount of L8 using the conveyor rolls 36 and 37, and by repeating the same operation as described above, the third and fourth sections are Segment fixation continues sequentially. The paper 5 is fixed while it is stopped, and the separation of L and paper feeding are performed when the pressure roll 19 is at either the home position or the stop position at the end of the forward movement, so conventional pressure fixing devices or many It is possible to complete the desired fixing while sequentially repeating the segmented and divided fixing until the final part of the paper 5, without having to release the pressure mechanically using a release mechanism that requires several parts. Note that the dimensional relationship between L1 and L2 can be arbitrarily determined depending on the purpose.

The most ideal aspect of the dimensional relationship between Ll and Ll is
Paper feed per section per roll width L1 k L
! The purpose is to make the relationship L1≧L. It is most desirable to use a pulse motor as the abrasive feeding motor, and to determine the feeding amount with high precision based on the pulse number.

To explain the above-mentioned divisional fixing in more detail based on the front side, FIGS. 8 and 9 are more detailed explanatory diagrams, and the range indicated by the mark in the figure is the roll width L of the pressure roll 19.
The first fixing area is equal to 1, and characters A, B, C, etc. are fixed in the arrow direction indicated by ABC...
The pressure roll 19 is rolled from the side edge of the paper 5 to the next position, and then the paper of the division length L2 is advanced and fed by the transport rolls 36 and 37, and then the paper is divided for the second time. Fixation (
range of II to which abco belongs] is carried out at 9 o'clock. Here, let L2 be the paper feed amount each time for the pressure roll length L1, and Ll
If the twist is made shorter, the area on the paper surrounded by the four dimensions extending across the sheet with a width of ΔL will be fixed under pressure overlappingly, so that no matter where there is image information on the paper 5, all image information will be fixed. It will become established. Repeat this operation for the third time (
The fixing is completed for all of the paper sheets 5 by repeating the fixing process sequentially for the fourth time (classification range (2)) and the fourth time (classification range (2)) up to the final stage. As described above, extremely good pressure fixing can be carried out by rolling and scanning a small diameter pressure roll while sufficiently satisfying the required load per unit length.

To make it easier to understand, let us assume that the roll width L8 is approximately 11 mm, the paper transport amount L8 per time is 10 mm, and the forward movement time from the home position 1 to the position indicated by the broken line is 0.5 seconds. It will be well understood that this will happen. In other words, when conveying A4 size paper on the short side of 210 scale, 1
The pressurizing force for fixing per rotation is very small, about 9 in 40, and if the bearing of the rotating body is a beer or needle bearing, the bearing loss is small and the required rotational torque of the drive motor 16 is very small. A small motor will suffice.

Further, since the length of A4 paper is approximately 300 m, it is sufficient to repeat the division and division fixing 30 times. Because fixing can be performed both in the forward and backward movements, only 15 reciprocating operations are required, and the time required to complete the entire fixing process is just under 16 seconds. In this way, the p processing time can be shortened by bidirectional fixing. Needless to say, it is also possible to repeat fixing in only one direction. In the intermittent conveyance of the paper, the back surface (non-toner side) of the paper moves while being in contact with the upper surface of the pressure receiving member, so that the next section can be reliably fixed in a stable state without the paper lifting up.

The pair of conveyance rolls for conveying the recording paper in FIG. 9 shows an example where they are arranged on the upstream side of the paper feed, and the roll on the toner side is a uniform roll on the back side of the paper, while the roll on the toner side is a roll with undefined toner. This is a partial roll that exists only at both ends of the paper, avoiding the binding area. As another example of conveyance, it is better to arrange a pair of paper conveyance rolls on the downstream side of the paper conveyance (not shown). While holding the front and back sides of the paper with the fixing diameter evenly, stabilize it and carry out the next conveyance at 8"71°.
,! As shown in FIGS. 2 and 3, the fixing range of one round is limited to the reciprocating range where the pressure roll width L1 acts, and the width of the pressure receiving member 27 is at least L. □You just have to deal with the length. In other words, the fixing of the present invention can be achieved by simply setting the pressure receiving member 27 in a direction transverse to the traveling direction of the sheet material to a length having a width of L1+α in FIG. It becomes a necessary pressure receiving member. In this way, the fixing device according to the present invention can be made into a shed and achieve the intended function in a small volume of space.

By adding an inclined surface 39 to the pressure-receiving member 27 on the upstream side of paper transport (the paper inlet side of the fixing device), it can also be used as a reliable guide for the front edge of the paper, and the paper 5 can be placed in the position required for fixing. , it is possible to correctly guide the paper while the back surfaces are in contact with each other, thereby preventing paper from floating and wrinkles during conveyance.In addition, as shown in FIG. 10, a separate internal material 40 can be added to the pressure receiving member. can.

According to the configuration of the embodiment described above, the total load required for pressure fixing is significantly reduced compared to the conventional pressure fixing device, and therefore the entire fixing device is made smaller and lighter. The problem of wrinkles that tend to occur when paper is fed, which is a drawback of conventional pressure fixing devices, can be completely solved by adopting the segmented fixing method.

Pressure fixing using the conventional device had problems such as uneven loading because the roll diameter was tried to be as small as possible during the effective period, but segmental fixing using the device of the present invention has problems such as - Since the fixing range is small, the problem of roller deflection due to the length of the roller during pressure application can be completely ignored, and the amount of elongation of the paper due to the pressure of pressure fixing also decreases in proportion to the pressure length. The paper is released from the pressure after each section is fixed, and the stress that accumulates within the paper surface, which is the source of wrinkles, can be released after each section is fixed, resulting in excellent pressure fixing. will be carried out. Thus, the pressure fixing device according to the present invention exhibits extremely excellent performance when used in combination with a high-speed printer, a microcompact personal computer printer, or a compact copying machine.

Next, the operation of the apparatus according to the embodiment of the present invention described above will be explained in detail.

Paper having a developed toner image formed by an electrostatic recording method as shown in the drawings, or other methods not shown, such as line printers in which toner transfer is obtained from a photosensitive rotary body, across the paper with respect to the feeding direction of the paper. The carrier that reciprocates in the direction is driven all the time (thereby mechanically rolling and scanning from the home position to the other end at a constant speed). At this time, the pressure roll 19 is driven and rolls on the paper 5 in synchronization with the amount of movement of the carrier. Therefore, the pressure roll applies continuous linear pressure by rolling motion without slipping onto the sheet of paper having an unfixed toner image that is stationary on the surface of the pressure receiving member, thereby fixing the toner image. In this way, a belt-shaped segmented image with a width equal to the roll width of the pressure roll 19 is formed on the paper 5 by the synchronous scanning performed by forward and backward rolling from the first home position controller.
completely fixed on top.

Following the above, the pressure roll 19 passes the other end of the paper 5, and stops at a position where it has traveled Δ. This stop is caused by the protrusion 41b on the carrier 13 being connected to a sensor 4 disposed on the side plate 24. This is achieved by stopping the pulse motor when it reaches Ob and obtains the detection signal. The father's distribution signal gives a drive signal to a paper conveyance (drum drive) motor (not shown), drives the conveyance roll 36, and conveys the paper 5 by an amount (L, ) corresponding to the length of the previous forward movement recorded. After that, the carrier 13 is again moved toward the home position and scanned in a backward motion, and the pressure roll is driven and rolled in the opposite direction to the forward motion to fix the second strip-shaped divided image on the paper 5. Let me know.

The operation signal for performing the above operation is L.

The number of nozzles required for the amount of phase rotation is set on a counter, and in response to the count end signal, a reverse circuit signal is given to the motor 16 to perform a double movement operation, and the protrusion 41a on the carrier 13 or the side plate 25 is The motor reaches the sensor 40a and obtains a motor stop detection signal. By repeating the above-described operations, the image can be fixed under pressure on the entire surface of the paper 5.
In order to fix one section, an operation signal to the drive motor 16 to start moving the carrier 13 is sent to the drive motor 16, which is not shown, but just before the leading edge of the paper 5 reaches the fixing area, a photo sensor is sent into the device for detection in the same manner as described above. The drive signal for the motor 16 may be generated by using conventional technology such as arranging the sensor at a position that does not interfere with the advance of the paper, and detecting the leading edge of the paper that reaches this sensor position. The reciprocating operation of the pressure roll 19 and the intermittent feed control of the paper described above may be repeated in sequence until the paper passes the sensor.

In order to roll the pressure roll 19 without slipping, in addition to the synchronous rolling using the illustrated binion rack system, electric direct rolling using a wire-pulley system or an independent motor mounted on the carrier 13 (not shown) It goes without saying that the drive system can be adopted. In short, any other method may be used as long as it satisfies the synchronous pressure rolling of the pressure roll, and the pressure roll presses the paper between it and the fixing standby pressure member, easily and stably. Finish uniform fixing.

After the last toner image area on the paper has been sectionalized and fixed, the transport roll continues to rotate, and the fixed paper is discharged outside the machine to complete the process.

In short, the present invention achieves miniaturization, weight reduction, and cost reduction of the device without reducing the pressurizing load that is less than a unit length on transfer paper with a toner image obtained by the conventional method of line printers. It provides a completely new pressure fixing device that is ideal for obtaining toner images, and can also be applied when using capsule toner etc. to reduce the squirting pressure. The type of printer does not matter.

For example, in the case of a line-by-line recording method using signals from multiple recording elements on a line called a line printer, the paper is fed by a pulse motor or a pulse count to the area of the section specified by 'fl' and then returned after completion. , the line printer's drum outer circumference is fed in response to each count of paper feeding, and each time a latent pattern is formed on the line using an image signal, and this operation is repeated for the number of counted lines necessary for paper feeding. .

The number of lines corresponding to the paper feed amount L2 is advanced, and then image signal recording is interrupted during the next segmented fixing operation. This signal can be easily obtained by a control signal for fixing, and controlling the recording side using this signal can be easily achieved by conventional techniques without requiring any ingenuity.

Also, regarding serial printers, patent application No. 59-517
No. 51, the necessary process by electrophotography is carried out on a reciprocating carrier and moved to form a latent image line by line, which is later made into a visible image. It is also possible to perform efficient fixing by combining a pressure fixing device.

Regarding recording using the above-mentioned line-feeding method, which is often used in typewriters, printers, etc., for example, the pressure roll width corresponds to the character height of one line while recording, and the conveyance roll corresponds to the character string feeding pitch. If intermittent feeding of 9 pitches is performed, there is no need to fix the margins between the lines, and efficient paper feeding can be achieved. Furthermore, when one line of character string ends at the center position on the paper, as soon as the fixing up to that character is completed, the carrier unit can be immediately switched to a backward movement operation to return the fixed character to the home position. In this case, it is sufficient to feed the paper by the regular amount using the conveyor rolls when returning to the home position t7.

Needless to say, if a line that does not require fixing occurs in the middle, skip line feeding, in which only paper feed 9 is performed, can be performed in the same way as in a normal printer.

〔Effect of the invention〕

As explained above, it is already clear that the fixing method of the present invention is the most effective fixing method for fixing recorded toner images in line recording. A configuration in which a plurality of electric wires are mounted on the drum and electrostatic recording is performed according to signals.The pitch of the drum is intermittently advanced according to the resolution by a gus motor, and recording is performed line by line. It can be applied in conjunction with a printer commonly called a line printer, which has
In this case, the count number of the pulse feed that determines paper feed corresponding to the width of the pressure roll described above may be made equal to the line feed count number of the line printer.

Furthermore, in the apparatus of the present invention, regarding the fixing of paper having an unfixed toner image j, unlike the conventional electrophotographic method, which required constant continuous feeding from latent image formation to fixation, By adopting a new pressure fixing method called sectional fixing, we have achieved a smaller, lighter, and lower cost device than before, and we have also made the drive source smaller, reducing the deflection of the pressure roll in the conventional method. Ideal fixing can be performed without instability such as partial unfixing due to etc., and without generation of wrinkles.

[Brief explanation of the drawing]

1 to 6 show an embodiment of a fixing device employing the segmented pressure fixing method according to the present invention, FIG. 1 is an external perspective view of the main parts of the fixing device, and FIG. 3 is a diagram showing the relationship between the pressure roll width, the pressure receiving member width, and the intermittent feed length of paper; FIG. 4 is a front view taken along the BB line in FIG. 1; FIG. 5 is a perspective view showing the support mode of the pressure receiving member, FIGS. 6 and 7 are illustrations of the alignment relationship between the pressure roll and the pressure receiving member, and FIGS. 8 and 9 are diagrams showing the division fixing according to the present invention. FIG. 10 is a side view showing the relative arrangement of a paper conveying roll, a pressure roll, and a pressure receiving member, and FIG. 11 is a general cross-sectional view of a pressure fixing method implementing a conventional pressure fixing method. 1...Drum 2...Recording head 3...
・Developer 4a, 4b...Transport roll pair 5...Distribution paper 6...Transfer charger 7・
...Cleaner 8a, 8b...Pressure roll pair 11.12...Guide rail 13"°° key gear 14...Belt 15...f-IJ
-16...Motor 17, 18...
Roller bearing 19...pressure roll 20, 21.
22...Gear 23...Spindle 24, 2
5... Side plate 26... Rack 27... Pressure receiving member 28, 29... Pressure spring 30, 31.
...Rotating shaft 32.33...Slot hole 34...3
5... 36, 37... Conveyance roll 10 Mataka 11 figure

Claims (1)

[Scope of Claims] 1. A device for fixing a recording paper carrying an unfixed toner image by applying pressure while the recording paper is being conveyed, and for conveying the recording paper in a fixed direction while alternately repeating conveyance and stopping. an intermittent conveyance means; a pressure receiving member having a flat top surface for supporting and guiding the recording paper and disposed in a direction transverse to the conveyance direction; a relatively narrow pressure roll disposed so as to be able to roll and scan, and during a stop period when the recording paper is intermittently conveyed, the pressure roll crosses the recording paper and presses the toner image on the toner image bearing surface of the recording paper. A pressure fixing device, characterized in that the unfixed toner image on the recording paper is pressure-fixed in a segmented manner by rolling and scanning a pressure roll. 2. The pressure-receiving member is guided and supported at both ends so as to be movable up and down with respect to the left and right side plates, and is pressed against the pressure roll by a pressure spring. Pressure fixing device as described. 3. The pressure-receiving member has a rotating shaft having a center of rotation within a plane located near the pressure-receiving surface at both ends thereof, and the rotating shaft is passed through a slot provided in the left and right side plates, respectively, and the pressure-receiving member is is guided and supported so as to be movable up and down with respect to the side plate, and the pressure receiving member is brought into pressure contact with the pressure roll by a pressure spring, so that uniform pressure is applied over the entire sectioned fixing area of the paper when the pressure roll rolls and scans. 2. The pressure fixing device according to claim 1, wherein self-alignment is performed in which the pressure fixing device is in a state in which the pressure fixing device is in the state of being self-aligned. 4. The pressure receiving member is configured to have a width wider than the pressure roll width, and is provided with an inclined surface serving as a receiving surface for guiding the paper on the upstream side in the conveyance direction of the recording paper. The pressure fixing device according to item 1. 5. When the roll width of the pressure roll is L_1 and the amount of recording paper transported each time by the intermittent transport means is L_2, the recording paper is 2. The pressure fixing device according to claim 1, wherein pressure fixing is performed over the entire surface with some overlapping portions.