JPH02137959A - Recording device - Google Patents

Abstract

PURPOSE:To prevent thoroughly a recording sheet from entering a clearance between a conveying means and a guide member by a method wherein when the recording sheet after recording an image is rewound, a rewinding amount is so established that a top of the recording sheet is positioned on a guide member. CONSTITUTION:A recording sheet 1 is conveyed with a platen roller 3a, and specific recording is performed with a recording head 3b at that time. When recording of an image is ended, a rear end of the image is conveyed to a cutter 5 to be cut therewith. After cutting, a top of the recording sheet remaining in a device is conveyed near a recording position in a recording part 3, and is rewound so that a blank part is not generated at the top of the sheet in the case of next recording. At that time, the top of the sheet is conveyed and so controlled as not to be dislocated from a guide part 4a of a guide member 4. That is, since the top of the rewound recording sheet 1 exists always on the guide part 4a of the guide member 4, when the recording sheet 1 is conveyed in the case of next recording, the top of the recording sheet 1 never enter a clearance between the platen roller 3a and the guide member 4.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a recording apparatus that can transport curled recording sheets without jamming them.

<Conventional technology> Today, facsimiles and printers are widely used, but
These recording systems are generally configured as shown in FIG. That is, a heat-sensitive recording sheet 51 wound into a roll is conveyed by a platen roller 50, and an image is formed by selectively heating this recording sheet 51 by a recording head 52. This is then cut from the trailing edge of the image by a cutter 53. It is configured to cant and discharge.

In the above configuration, a guide 54.5 is provided between the platen roller 50 and the cutter 53 so that the sheet 51 after recording is reliably conveyed between the movable blade 53a and the fixed blade 53b.
5 is provided. This guide 54 allows the recording sheet 51 to be placed in the gap 5 between the platen roller 50 and the guide 54.
It is necessary to manage the gap 56 so that it does not enter the gap 6. In addition, in order to prevent the leading edge of the recording sheet 51 from entering the lower side of the movable blade 53a, the cutter side end of the guide 54 needs to be managed at a higher position than the movable blade 53a, and the gap between the guide 54 and the movable blade 53a does not become large. There is. Therefore, conventionally, when installing the guide 54 or cutter 53, the gap 56 is controlled and adjusted.

Conventionally, when constructing a structure such as a facsimile with a sheet metal chassis, the platen roller 5o is rotatably fitted into the fitting holes on both side plates of the chassis, and the guide 54 and cutter 53 are attached to the chassis. It is common to install it by fixing it on the stay. and the guide 5
Adjustment of the gaps between the platen roller 5 and the cutter 53 relied on the dimensional accuracy of each component. This is because the drive link of the cutter 53 is positioned by the chassis, so the cutter 53 must be positioned relative to the chassis to ensure cutter stroke.

Additionally, some device structures use resin molds as chassis bases, but in order to keep the overall mold cost low, there are restrictions on the orientation of screw holes, etc. In this case, when screwing the guide 54 to the steering base from above,
The gap between the platen roller 50 and the guide 54 is adjusted.

Furthermore, a cutter 53 is fixed thereon by being positioned to fit with a bottle of the chassis base. In this case, the guide 54 is attached between the chassis base and the cutter 53 in a loose manner.

<Problems to be Solved by the Invention> There is a desire for miniaturization of the facsimile machines and the like. Therefore, if the inner core 51a of the sheet roll is made thinner, the recording sheet 51 will become curly when the remaining amount of the sheet becomes small.
The sheet 51 is in a curled state. For example, this curl can be achieved by setting the diameter of the inner core 51a of the roll to about 16 mm, and the outer diameter of the platen roller 50 to about 1 (iu+, 18 to 20 mm).
It will be about m.

Therefore, the curled recording sheet 51 tends to enter the gap 56 between the platen roller 50 and the guide 54, and to prevent this, the gap 56 must be maintained within about 0.3 to 0.8 mm.

However, if the adjustment of the gap is based on the dimensional accuracy of each component as in the past, and if assembly adjustment is not performed, the gap will vary within a range of at least 0 to 1,5 IIm. Therefore, in order to manage the gap, an adjustment process is required for each machine, which becomes an obstacle to reducing manufacturing costs and causes an increase in the defective rate due to adjustment errors.

Furthermore, when the chassis is made of a resin mold, the guide 54 has to be bent a lot and the cutter 53 is tightly tightened, so the gap adjustment has to be made more precisely.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and to provide a recording device that prevents a recording sheet from entering the gap between the conveyance means and the guide member and eliminates the need for managing the gap between the conveyance means and the guide member. It is about providing.

Means for Solving the Problem> Means for solving the problem includes a conveying means for conveying a recording sheet, a recording means for forming an image on the recording sheet conveyed by the conveying means, a cutting device disposed downstream of the recording means in the conveyance direction of the recording sheet and for cutting the recording sheet; and a recording disposed between the recording means and the cutting means and conveyed by the conveyance means. A recording device is configured by providing a guide member for guiding the sheet, and a conveyance control means for rewinding the recording sheet so that the leading edge of the recording sheet cut by the cutting means is positioned on the guide member. It is characterized by this.

<Operation> According to the above means, the leading edge of the recording sheet cut from the trailing edge of the image is always on the guide member, and therefore there is no possibility that the leading edge of the sheet enters the gap between the conveying means and the guide member. Therefore, it is no longer necessary to manage the gap between the conveying means and the guide member, which has been required in the past, and there is no possibility that even curled recording sheets may jam in the gap.

<Embodiment> Next, an embodiment of the present invention in which the above means is applied to a facsimile machine will be described.

FIG. 1 is a central cross-sectional view of the facsimile machine.

First, to explain the overall configuration of the device, ① is a thermosensitive recording sheet that develops color by applying heat.A long sheet is wound in a roll around an inner core 1a having a diameter of about 16-1, and the sheet roll 1b is dropped into the recording sheet. It is stored in a roll holder 2 of the type.

An image is recorded on the recording sheet 1 in a recording section 3, which will be described later, and the recorded sheet 1 is guided by a guide member 4 to a canter 5 serving as a cutting means, is cut from the trailing edge of the image, and is then cut by a discharge roller 6. It is configured to be stacked on a reversing tray 7.

On the other hand, after the recording sheet l in the apparatus has been cut by the cutter 5, the leading edge of the sheet is wound around the recording section 3 by a control means to be described later so that a blank area does not appear at the leading edge during the next recording. It is structured as if it had been returned.

Reference numeral 8 denotes a document reading section, in which the documents 9 stacked on the top cover are separated one by one by a preliminary conveyance roller 8b in pressure contact with a separation pressing piece 8a and a separation roller 8d in pressure contact with a separation pressing piece 8C, and further pressed. It is configured to be transported by a transport roller 8f that is in pressure contact with a roller 8e. Further, the surface of the transported document 9 is irradiated with light by a light source 8g, and the reflected light is directed to a photoelectric conversion element 8j such as a CCD via a mirror 8h and a lens 81, and the image is converted into a self-transformer in the copy mode. The recording unit is configured to transmit data to the recording unit of another machine when in facsimile mode (transmission mode).

Next, the configuration of each part will be explained in detail.

The configuration of the recording section 3 is such that a recording head 3b, in which heating elements that are individually energized and generate heat in response to both signals and arranged in a row, is pressed by a pressing spring 3C on the surface of a platen roller 3a, which is driven by a motor (not shown) and also serves as a conveying means. It will be done. Therefore, the platen roller 3a is rotated in the direction of arrow A shown in FIG. It is recorded.

Next, the cutter 5 will be explained. This is a fixed blade 5a.
This is a rotary cutter consisting of a movable blade 5b and a movable blade 5b. The fixed blade 5a is attached to a fixed blade stay 58z that is rotatable around the shaft 5a+, and the fixed blade 5a is attached to this stay 5az.
An upper guide portion 5a3 is formed.

The movable blade 5b is similarly attached to a movable blade stay 5bz that is rotatable around a shaft 5b+, and furthermore, a discharge roller 6 is provided on the upper surface of the movable blade 5b for discharging the recording sheet 1 which has been awned by the canter 5. A movable blade guide 5b is provided for guiding the blade.

In FIG. 1, 5C is a canter chassis which is the structure of the entire cutter, and has side plate portions (not shown), into which the shaft 5a+ of the fixed blade 5a moves. It is rotatably attached so as to bias the blade 5b.Similarly, the shaft 5b+ of the movable blade 5b is rotatably attached to the positioning hole of the side plate, and this shaft 5b
+ is configured to transmit rotational force from a motor (not shown). When the movable blade 5b rotates, it sequentially rubs against the fixed blade 5a, and the recording sheet 1 inserted between the two blades 5a and 5b is cut.

Next, the mounting structure of the guide member 4 for guiding the recording sort 1 from the recording section 3 to the cutter 5 will be explained.

This guide member 4 is disposed downstream of the platen roller 3a in the sheet conveyance direction and upstream of the cutter 5, and has a cross-sectional path formed in a "TJ-shape" by the guide portion 4a and bent leg portions 4b. It will be done.

The guide member 4 is attached to the cutter chassis 5 using screws 10 at two predetermined positions on the leg portion 4b.
It is attached to C. At this time, as shown in FIG. 2, the length of the leg portion 4b of the guide portion 4a of the guide member 4 is set to be higher than the movable blade 5b, and the length of the leg portion 4b is set to be higher than the movable blade 5b. The length of the guide portion 4a is set so that a gap 1 separates the movable blade 5b from the movable blade 5b.

The size of the gap l is such that the guide member 4 does not interfere with the rotation of the movable blade 5b, and the leading edge of the recording sheet after recording does not enter the gap l.

By attaching the guide member 4 as described above, the gap between the guide member 4 and the cutter 5 can be set accurately without adjusting, and the recording sheet l after recording is fixed without entering the gap β. It is conveyed between the blade 5a and the movable blade 5b.

Next, conveyance control of the recording sheet 1 will be explained.

The recording sheet l is conveyed by a platen roller 3a,
At this time, predetermined recording is performed by the recording head 3b. When the image recording is completed, the trailing edge of the image is conveyed to the canter 5 and cut.

After the cutting, the leading edge of the recording sheet remaining in the apparatus is conveyed to the vicinity of the recording position in the recording section 3, and is rewound so that no blank area will be generated at the leading edge of the sheet during the next recording. At this time, the guide portion 4 of the sheet leading edge guide member 4
The conveyance is controlled so that it does not fall out of position a.

Specifically, as shown in FIG. 2, the conveyance amount of the recording sheet l from the recording line W of the recording unit 3 to the cut line C of the cutter 5 is calculated by (vIi number of conveyances), and the platen of the guide member 4 is The amount of conveyance of the recording sheet 1 from the end of the roller 3atltll to the cut line is L (the number of inches to feed), and the amount of conveyance of the recording sheet 1 from the edge of the guide member 4 on the cutter 5 side to the cut line is L3. (number of conveyance lines), after the image recording is completed, the recording sheet 1 is conveyed by L1 lines and the trailing edge of the image is conveyed to the cut line C, and then the cutter 5 is driven to cut the recording sheet 1. Next, the platen roller 3a is driven in the reverse direction to rewind the recording sheet 1, but the rewinding angle ilL is controlled so that <t<t, z.

When the rewinding amount is controlled as described above, the leading edge of the rewound recording sheet l is always on the guide portion 4a of the guide member 4, so that when the recording sheet l is conveyed for the next recording, the leading edge of the recording sheet l This prevents the particles from entering the gap between the platen roller 3a and the guide member 4.

The control system for controlling the conveyance as described above will now be explained. This control system is constructed as shown in the block diagram of FIG. 3. In the figure, 20 is used as a CPU 20a such as a microprocessor, a ROM 20b storing control programs and various data for the CPU 20a, and a work area for the CPU 20a.
It is a control unit equipped with a RAM 20c for temporarily storing various data, etc., and receives signals from the operation panel 22, its own reading unit 8, or external equipment 23 via the interface 21, and controls the respective motor drivers 24 and 25. A platen motor 26 for driving the platen roller 3a and a cutter motor 27 for driving the movable blade 5b are driven through the head driver 28, and the recording head 3b is driven and controlled through the head driver 28.

Next, the sheet conveyance control procedure by the control system will be explained with reference to the flowchart of FIG.

When a recording start signal is input from the operation panel 22 or the like in step S1, the process moves to step S2, where the platen motor 26 is driven to rotate in the normal direction to rotate the platen roller 3a in the direction indicated by the arrow in FIG. transport. Next, in step S3, the recording head 3b generates heat and records an image on the recording sheet 1 in response to an image signal manually input from an external device 23 or the like in synchronization with the sheet conveyance. When it is detected in step S4 that this image recording has been completed, the process proceeds to step S5 f times, drives the platen motor 26 for L lines, and conveys the image until the trailing edge reaches the cut line C, and then proceeds to step S6. Then, the drive of the platen motor 26 is stopped.

Next, in step S7, the cutter motor 27 is driven forward by a certain amount to rotate the movable blade 5b, and the recording sheet 1 is rotated.
is cut from the trailing edge of the image, and the cutter motor 27 is driven in the reverse direction in the progressive S8, and the recorded recording sheet) 1 is discharged onto the reversing tray by the discharge roller 6. The discharge roller 6 is connected to the cutter motor 27 via a flange or the like, and when the cutter motor 27 is driven in reverse, driving force is transmitted and rotates, but at this time, no driving force is transmitted to the movable blade 5b. It looks like this.

Simultaneously with the ejection, in step S9, the platen motor 26 is driven in the reverse direction to rewind the recording sheet l.

When the rewind amount reaches L lines in step 310, the process moves to step Sll and the drive of the platen motor 26 is stopped. Further, when the recorded sheet 1 is discharged onto the reversing tray 7, the drive of the canter motor 27 is stopped in step S12.

Here, the L line beam is set to <L<L, as described above. By controlling the amount of rewinding of the recording sheet 1 as described above, the leading end of the recording sheet 1 is always positioned on the guide member 4.

In the embodiment described above, by bringing the end of the guide member 4 on the platen roller 3a side as close to the recording line as possible, the leading end of the rewound recording sheet 1 can be brought closer to the recording line. This is preferable since it is possible to reduce the blank space generated at the leading edge of the sheet during the next recording.

Further, in the above-described embodiment, the platen roller 3a was used as an example of the conveying means for the recording sheet 1, but the conveying means need not be limited to the above-mentioned roller, and may be a conveying roller separate from the platen roller 3a. .

<Effects of the Invention> As described above, according to the present invention, when rewinding a recording sheet after image recording, the rewinding amount is set so that the leading edge of the recording sheet is positioned on the guide member, so that the recording sheet can be easily moved by the conveying means. It is possible to completely prevent the guide member from entering the gap between the guide member and the guide member.

In addition, for example, when a platen roller is used as a conveying means, there is no need to adjust the gap between the platen roller and the guide member, and there is no need for strict component precision or assembly precision, which can reduce costs. It is.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view of a facsimile machine according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the amount of rewinding of a recording sheet after cutting, FIG. 3 is a block diagram of a control system, and FIG. 5 is a flowchart showing the sheet rewinding control procedure.
The figure is an explanatory diagram of the prior art. I is the recording sheet, 1a is the inner core, IB is the sheet roll, 2
is a roll holder, 3 is a recording section, 3a is a platen roller, 3b is a recording head, 3c is a pressing spring, 4 is a guide member, 4a is a guide section, 4b is a leg section, 5 is a cutter,
5a is a fixed blade, 5a is a shaft, 5a is a fixed blade stay, 5a
z is the upper guide part, 5b is the movable blade, 5b is the shaft, 5b,
is a moving blade stay 5b, is a moving blade guide, 6 is a discharge roller, 7 is a reversing tray, 8 is a document reading section, 8a is a separation pressure piece, 8b is a prem*feed roller, 8c is a separation pressure piece, 8d
8 is a separation roller, 8e is a pressure roller, 8 is a conveyance roller, 8
g is a light source, 8h is a mirror, 81 is a lens, 8j is a photoelectric conversion element, 9 is an original, 10 is a screw, 20 is a control unit, 20a
Ha CPU, 20 b l! ROM, 20c ha RA
M, 21 is an interface, 22 is an operation panel, 23
is an external device, 24.25 is a motor driver, 26 is a platen motor, 27 is a cutter motor, and 28 is a yohrad driver.

Claims (2)

[Claims] (1) a conveyance means for conveying a recording sheet; a recording means for forming an image on the recording sheet conveyed by the conveyance means; disposed downstream of the recording means in the conveyance direction of the recording sheet; a cutting means for cutting the recording sheet; a guide member disposed between the recording means and the cutting means for guiding the recording sheet conveyed by the conveyance means; A recording apparatus comprising: a conveyance control means that sets a rewinding amount of the recording sheet so that the leading edge of the recording sheet is positioned on the guide member. (2) The recording apparatus according to claim 1, wherein the conveyance means is a platen roller that is in pressure contact with the recording head.