JPH0386573A - Recorder - Google Patents

Abstract

PURPOSE:To prevent a sag part from falling into the hard habit of curling in a standby state to stabilize the feed direction of a recording sheet by a method wherein a recording sheet rewinding amount is determined so that the leading end of the recording sheet is rewound to a recording head after the recording sheet is cut and further fed in the feed direction by a fixed amount. CONSTITUTION:The feed amount of a recording sheet 1 from a recording line W of a recording head 3b to a cut line C by a cutter 5 is L1, and the feed amount of the recording sheet 1 to be fed once in the feed direction after cutting is L2. After the completion of image recording, the rear end of the image is fed to the cut line C by feeding the recording sheet 1 by the amount of lines L1. Thereafter, the cutter 5 is driven to cut the recording sheet 1. The recording sheet 1 is fed by the amount of lines L2, and a platen roller 3a is reversely rotated under control to rewind the recording sheet 1 by the amount of lines L1+L2. Under the control of the rewinding amount in this manner, the sag amount of the recording sheet 1 at a decurl roller 6a and thereabouts is increased. Since the recording sheet 1 draws a large circule in a standby state, the recording sheet 1 does not fall into the hard habit of curling.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a recording apparatus having a decurling mechanism for correcting curling of a recording sheet wound into a roll.

<Prior Art> Today, office equipment such as facsimile machines and printers are widely used, and the recording systems of these devices generally use a roll sheet in which a long recording sheet is wound around a core.

Since this recording sheet is wound into a roll, it is likely to be curled (hereinafter referred to as 1 curl 1), and a curled recording sheet is likely to jam during transportation. For this reason, many recording apparatuses that use the roll sheet are equipped with a decurling mechanism to remove or reduce the curl.

For example, as a recording device equipped with the decurling mechanism, the fifth
There is one configured as shown in the figure. In this method, decal rollers 51a and 51b are disposed between a roll holder 50 loaded with a heat-sensitive type recording sheet 50a wound in a roll and a platen roller 52.
2, in the process of conveying the recording sheet 50a to the recording head 53, the recording sheet 50a is bent in the opposite direction to the curl to correct the curl, and then conveyed to the recording head 53 for recording, and the recording head 53 selectively heats the recording sheet 50a to form an image. The recording sheet 50a is then conveyed to a cutter 56 via guide members 54 and 55, the recording sheet 50a is cut from the trailing edge of the image by the canter 56, and the cut recording sheet 50a is inserted into a stacker 57. It consists of

In the recording apparatus, the leading end of the recording sheet 50a is held in the stacker 57 and curved into a loop shape as shown by the two-dot chain line in FIG. 5 until it is cut by the cutter 56. Then, as shown by the dotted line in the figure, the rear end of the cut recording sheet 1-50a protrudes to the outside of the apparatus due to the elasticity of the recording sheet 50a itself.

Further, the leading edge 50aI of the recording sheet 50a remaining on the roll holder 50 side is rewound by the platen roller 52 to the recording line 53a of the recording head 53 in preparation for the next image output, as shown in FIG. Wait there.

<Problems to be Solved by the Invention> In the recording apparatus, after cutting the recording sheet 50a, the leading end 50a of the recording sheet 50a is simply rewound from the canter 56 to the vicinity of the recording line 53a of the recording radius 53. In the standby state until recording, there is little slack in the recording sheet 50a at the decal roller 51b portion,
The recording sheet 50a remains in a strongly bent state.

If left in such a standby state, the recording sheet 50
A strong bending tendency occurs in the recording sheet 50a, and as a result, even after recording, the recording sheet 50a remains partially bent.
There was a drawback that the direction of conveyance of a was not determined and it could not be reliably placed in the stacker 57.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to prevent strong bending from occurring in the slack portion during standby state, preventing the recording sheet from remaining partially bent after recording, and recording. An object of the present invention is to provide a recording device in which the sheet conveyance direction is stable.

Means for Solving the Problems> Means of the present invention for solving the problems described above includes a conveyance means for conveying a recording sheet, and a recording system for forming an image on the recording sheet conveyed by the conveyance means. a decurling means disposed upstream in the conveying direction of the recording sheet No. 1 from the recording means, and a decurling means for removing curls from the recording sheet; and a decurling means disposed downstream in the conveying direction of the recording sheet from the recording means; a cutting means for cutting the recording sheet;
a conveyance control means that sets a rewinding amount of the recording sheet so that after the recording sheet is cut by the cutting means, the recording sheet is further conveyed in a constant III feeding direction and then the leading edge of the recording sheet is rewound to the recording head; It is characterized by being composed of

<Function> In the above means, after the recording sheet is cut by the cutting means, the recording sheet is further conveyed in the conveying direction, and then the rewinding amount is adjusted so that the leading edge of the recording sheet returns to the position of the recording means. Control.

That is, by increasing the amount of rewinding of the recording sheet and increasing the slack of the recording sheet at the decurling means portion (drawing a gentle arc), the slack portion is increased by +To in the standby state. I try not to get into the habit.

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

[First example]

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

First, the overall structure of the apparatus will be explained. 1 is a heat-sensitive recording sheet that develops color by applying heat, and the sheet roll 1a is
is stored in a drop-in type roll holder 2.

The recording sheet 1 is decurled by a decurling means 6, after which an image is recorded in a recording section 3, which will be described later. It is configured to be canted from the rear end and stacked on the reversing tray 7.

On the other hand, the recording sheet l within the Vtl after being cut by the canter 5 is controlled so that the leading edge of the sheet is brought close to the recording unit 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 so that it can be rewound.

Reference numeral 8 denotes a document reading section, in which the documents 9 stacked on the top cover are placed in pressure contact with a separation pressing piece 8a.
The structure is such that the sheets are separated one by one and further transported by a transport roller 8r that is in pressure contact with a pressing roller 8e. Furthermore, the surface of the original iI & 9 to be transported is irradiated with light if98g, and the reflected light is transmitted to ζCC through ξcoupler 8h and lens 8i.
The image is transmitted to a photoelectric conversion element 8j such as D, and the image is transmitted to its own recording unit in copy mode and to the recording unit of another device in facsimile mode (transmission mode).

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

The configuration of the recording unit 3 is such that a recording pad 3b is arranged in a row on the surface of a platen roller 3a, which also serves as a conveying means driven by a motor (not shown), and which generates heat by being individually energized in response to both signals. It becomes pressurized. Therefore, the platen roller 3a is rotated in the direction of arrow A shown in FIG. 1 to convey the recording sheet l, and in synchronization with this, the heat generating element is made to generate heat in accordance with both signals, thereby producing an image on the recording sheet l. It is recorded.

Further, the decurling means 6 is for removing the curl of the recording sheet 1 wound into a roll, and includes a decurling roller 6a for winding the recording sheet 1 in the opposite direction to the curl, and a recording sheet for the decurling roller 6a. 1
The winding is constituted by a guide roller 6b that sets the angle. In this embodiment, the decal roller 6a,
The guide roller 6b is constituted by a metal shaft having a diameter of about 4 mm.

The winding angle of the recording sheet 1 around the decurl roller 6a is determined by the angle between the guide roller 6b and the platen roller 3.
This position is determined by the position of a, and the position is set so that curling can be corrected to a good degree from large to small diameters of the rolled recording sheet l.

Next, the cutter 5 will be explained. This is a fixed blade 5a.
This is a jH1 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 5 is attached to this stay 5az.
An upper guide portion 5a is formed.

The movable blade 5b is similarly attached to a movable blade stay 5bz that is rotatable around the shaft 5b+, and furthermore, the recording sheet l canted by the cutter 5 is guided to the reversing tray 7 on the upper surface of the movable blade 5b. A movable blade guide 5b is provided for this purpose.

In FIG. 1, reference numeral 5C denotes a cutter chassis that constitutes the entire structure of the cutter 5, and has both side plate portions (not shown), and the shaft 5a+ of the fixed blade 5a is inserted into the positioning hole of the side plate so that the movable blade 5b It is rotatably attached so as to bias it. Similarly, the shaft 5b+ of the movable blade 5b is rotatably attached to the positioning hole of the side plate.
+ 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, conveyance control of the recording sheet 1 will be explained.

The recording sheet 1 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 cutter 5 and cut.

After the cutting operation, the recording sheet l remaining in the device is once fed a certain amount in the conveying direction, and then the leading edge of the recording sheet is conveyed to the vicinity of the recording position in the recording section 3, and a blank space is created at the leading edge of the sheet for the next recording. is rewound so that it does not occur.

The mechanism for feeding the recording sheet 1 in the conveyance direction after the canting operation was determined through experiments and set so that the recording sheet 1 would have slack at the decal roller 6a portion after the rewinding to the extent that the recording sheet 1 would not have a strong tendency to curl. It is something.

Specifically, as shown in FIG. 2, the amount of conveyance of the recording sheet l from the recording line W of the recording point 3b to the force point line C of the cutter 5 is expressed as (the number of conveying lines), and the cutting The conveyance amount that is once sent in the conveyance direction after that is L2.
In this case, after the image recording is completed, the recording sheet 1 is conveyed by L1 lines, the trailing edge of the image is conveyed to the cut line C, the cutter 5 is driven to cant the recording sheet 1, and then the recording sheet 1 is cut by 12547 lines. After the recording sheet 1 has been conveyed by 2 lines, the platen roller 3a is driven in the reverse direction to rewind the recording sheet 1 by L+L2 lines.

By controlling the amount of rewinding in this way, the decal roller 6
The amount of slack in the recording sheet 1 near a increases, and the recording sheet 1 draws a large arc in the standby state, so that the recording sheet 1 does not have a strong bending tendency.

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 includes a CPU 20a such as a microprocessor, a ROM 20b that stores control programs and various data for the CPU 20a, and a RAM 20c that is used as a work area for the CPU 20a and temporarily stores various data. It is a control unit equipped with a control unit that receives signals from an operation panel 22, an original reading unit 8, or an external controller 23 via an interface 21, and controls motor drivers 24 and 2, respectively.
5, a platen motor 26 for driving the platen roller 3a, a cutter motor 27 for driving the movable blade 5b, and a handle driver 2.
The recording head 3b is driven and controlled via the recording head 8.

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

In step 31, when a recording start signal is input manually from the operation panel i2, etc., the process moves to step S2, where the platen motor 26 is driven to rotate in the normal direction, rotating the platen roller 3a in the direction indicated by the arrow in FIG. 1, and conveying the recording sheet 1. do. Next, in step S3, the recording throat 3b generates heat in response to both signals inputted from the external device 23, etc., and records an image on the recording sheet 1 in synchronization with the sheet conveyance. When it is detected in step S4 that this image recording has ended,
In step S5, the platen motor 26 is driven for L life to convey the image until the trailing edge reaches the cut line C, and then in step S6, 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 rear end of the image and discharged to the reversing tray 7.

Next, proceed to step S8 and turn the platen motor 26 to L.
After driving for two lines, the platen motor 26 is driven in the reverse direction in step S9 to rewind the recording sheet 1, and the amount of rewinding is determined in step SIO by the amount of rewinding L+ +1. , line speed, the process moves to step Sll and the drive of the platen motor 26 is stopped. Further, when the recorded recording sheet l is ejected to the reversing tray 7, the cut motor 2 is activated in step 312.
7 is stopped.

As described above, the rewind IL is set to be L, +L2. By controlling the amount of rewinding of the recording sheet l as described above, the recording sheet l
This prevents a strong bending tendency from occurring and the conveyance direction of the recording sheet 1 is not determined, and the leading edge of the recording sheet 1 is reliably accommodated in the reversing tray 7.

(Embodiment II!1) In the first embodiment described above, the platen roller 3a is used as an example of the conveying means for the recording sheet 11, but the conveying means does not have to be limited to the platen roller 3a. A separate conveyance roller may be used.

Furthermore, although the above-mentioned recording system has been explained by taking as an example a thermal recording device using a heat-sensitive sheet material, the present invention can be similarly applied to a thermal transfer recording device that transfers ink from an ink sheet to paper that passes through the sheet. .

<Effects of the Invention> As described above, the present invention cuts the recording sheet by the cutting means, then further conveys the recording sheet by a certain amount in the conveyance direction, and then rewinds the leading edge of the recording sheet to the recording head. Since the rewind setting is set to 4, there will be no strong oil build-up in the slack parts during standby, and the recording sheet will not remain partially bent after recording. The direction of transport can be stabilized.

[Brief explanation of drawings]

FIG. 1 is an explanatory central cross-sectional view of a fusing device 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, and FIG. 3 is a block diagram of a control system. 4
The figure shows flowchart 1 showing the sheet rewinding control procedure.
, FIG. 5, and FIG. 6 are explanatory diagrams of the prior art. 1 is a recording sheet, 1a is a sheet roll, tb is a curved part, lc is a tip, 2 is a roll holder 3 is a recording part, 3a
is a platen roller, 3b is a recording throat, 3c is a pressing spring, 4 is a guide member, 5 is a cutter, 5a is a fixed blade, 5a+ is a shaft, 5at is a fixed blade stay, 5al is an upper guide part, 5b is a movable blade, 5bl is a shaft, 5b is a fixed blade stay, sb is a movable blade guide, 6 is a decal means, 6a
is a decal roller, 6b is a guide roller, 7 is a reversing tray, 8 is a document reading section, 8a is a separation pressure piece, 8b is a pre-vi conveyance roller, 8c is a separation pressure piece, 8d is a separation roller, 8e is a pressure roller, 8r is the transport roller, 8g is the light source, 8
h is a mirror, 81 is a lens, 8j is a photoelectric conversion element, 9 is an original, 20 is a control unit, 20a is a CPU, 20b is a ROM
, 20c is I? A M, 21 is the interface, 2
2 is an operation panel, 23 is an external @1%, 24.25 is a motor driver, 26 is a platen motor, 27 is a cutter motor, and 28 is a head 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 upstream of the recording means in the conveyance direction of the recording sheet; a decurling device for removing curls from the recording sheet; a cutting device disposed downstream of the recording device in the conveyance direction of the recording sheet for cutting the recording sheet; and a cutting device for cutting the recording sheet by the cutting device. A recording apparatus comprising: a conveyance control means that sets a rewinding amount of the recording sheet so that the recording sheet is further conveyed by a certain amount in the conveyance direction and then the leading edge of the recording sheet is rewound to the recording head. (2) The recording apparatus according to claim 19, wherein the conveyance means is a platen roller that is in pressure contact with the recording means.