JPH0565543U - Image recorder - Google Patents

Abstract

(57) [Summary] [Purpose] In a roll recording paper and an image recording device configured to perform printing a plurality of times on the same side of the recording paper, the recording paper is imperfectly mounted on the platen. Provided is an image recording device that can obtain normal printing even if the recording is performed. [Structure] Rolled recording paper, a printing mechanism for forming an image on the recording paper, a paper feeding mechanism for pulling out or pulling back the recording paper, and a tension on the recording paper when the recording paper is pulled out. Back tension mechanism that gives
In an image recording apparatus having a control mechanism and configured to perform printing a plurality of times on the same surface of the recording paper based on an instruction from the control mechanism, after pulling out a predetermined length of the recording paper before printing. The control means for pulling back and performing the idling operation is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an image recording apparatus of a type in which a roll-shaped recording paper is used to perform recording a plurality of times on the same surface of the recording paper.

[0002]

[Prior Art]

 The multi-pass method, which is a method of recording multiple times on the same side of the recording paper, is an effective method for obtaining multicolor images. An image recording apparatus using this method includes a thermal transfer recording apparatus and the like. FIG. 5 shows the general structure of a thermal transfer recording device in this image recording device.

In FIG. 5, an image recording apparatus 1 includes a recording mechanism 2, a paper feeding mechanism 3, a cutter mechanism 4, and a roll-shaped recording paper 6 (hereinafter, simply referred to as recording paper 6). The recording mechanism 2 uses a thermal head and a sheet-shaped or ribbon-shaped ink film in the thermal transfer recording apparatus. When making multiple colors, it is common to have a recording mechanism that can change the recording color and change the recording color for each recording operation. A paper feed roller is usually used for the paper feed mechanism 3. The paper feed roller is made by applying non-slip processing such as rubber to the cylindrical surface of a cylindrical object that is longer than the width of the recording paper, and is installed so that the processed surfaces are paired together to form a unit. One of them is used as a driving roller and the other is used as a supporting driven roller. The recording paper is conveyed by winding the recording paper around a driving roller and rotating the driving roller using a driving means such as a motor. The illustrated mechanism includes a platen roller as a driving roller and a supporting guide roller, and the guide rollers are arranged on both sides of the platen roller. The cutter mechanism 4 is a mechanism that cuts the recorded recording paper into a single sheet, and slides a plate-shaped or disc-shaped cutting blade on a guide extending in the direction orthogonal to the direction of the recording paper for recording. Many of them cut the paper and are usually placed near the outlet. The recording paper 6 is held by a recording paper holding unit (not shown) and is rotatably supported so that the paper is fed out when the paper feeding mechanism 3 operates. A mechanism is provided to provide a force that prevents rotation of the paper in the rotation direction, that is, a back tension, so that the paper does not rotate due to inertia. In the image recording apparatus 1, as shown in FIG. 6, each of these parts is operated by the control mechanism 5 on the basis of data sent from a higher-level device such as a personal computer, and a desired image is obtained on the recording paper. ..

In the apparatus shown in FIG. 5, the recording mechanism 2 and the paper feeding mechanism 3 are combined, and recording is performed on a paper feeding roller. FIG. 4 is a diagram for explaining the main part of this configuration, and the same mechanisms as those in FIG. 5 have the same reference numerals. In the figure, 21 is a thermal head, 22 is a head support portion, 23 is a head support shaft, 31 is a platen roller, 32 is a guide roller, and 7 is an ink ribbon. In this apparatus, two guide rollers 32 provided close to both sides of the platen roller 31 hold the recording paper 5 in a narrowed state, and the guide roller 32 is driven according to the rotation of the platen roller 31. Is configured to convey the recording paper 5. During recording, the thermal head 21, which is attached to the head support shaft 23 via the head support mechanism 22, is positioned on the platen roller 31 by the rotation operation of the head support shaft 23, and the elements in the thermal head generate heat to generate ink. The ink of the ribbon 7 is melt-transferred onto the recording paper to obtain an image.

[0005]

[Problems to be solved by the device]

 In the mechanism of FIG. 4, the recording paper 6 moves back and forth on the platen roller 31 every time one color is recorded, so it is desirable that the recording positions are the same on a plurality of screens. Therefore, it is an essential requirement that the recording paper 6 be mounted on the platen roller 31 in a stable state. This stable state means that the recording paper is not lifted up and does not skew even when it reciprocates on the platen roller, and the recording paper 6 is in close contact with the platen and the mounting direction is It is a state of moving in the direction of progress. However, in this mechanism, the recording paper 6 may float above the platen roller 31. That is, it was sometimes positioned as shown in FIG. In the figure, the upper view is a front view and the lower view is a side view, and the part a is a raised portion. This floating of the paper is caused when the recording paper 6 is obliquely mounted, or when the recording paper 6 and the ink ribbon 7 are adhered to each other when the thermal head 21 after recording moves upward (head up). Had occurred.

As shown in FIG. 3, when recording is performed in a state where the recording paper 6 is lifted up, the recording cannot be performed at the same location, and the paper may be conveyed obliquely. The printing position differs for each case, and further, the phenomenon that the recording paper 6 comes off from the platen roller 31 occurs. Therefore, there is a problem that a good image cannot be obtained. The present invention has been made in view of this point, and an object thereof is to provide an image recording apparatus capable of obtaining a good image even when the recording paper is in a floating state.

[0006]

[Means for Solving the Problems]

 The image recording apparatus of the present invention comprises a roll-shaped recording paper, a recording mechanism for forming an image on the recording paper, a paper feeding mechanism for pulling out or pulling back the recording paper, and a recording mechanism for pulling the recording paper out. An image recording apparatus having a back tension mechanism for applying tension to recording paper and a control mechanism, and configured to perform recording a plurality of times on the same surface of the recording paper based on an instruction from the control mechanism. It is characterized in that it is provided with a control means for performing an idling operation in which a predetermined length of the recording paper is pulled out before and then pulled back.

Therefore, when pulling out the recording paper, the back tension mechanism acts to give the backing tension to the recording paper, and the back tension brings the recording paper and the platen roller into the most stable state described above. It is possible to prevent misalignment of the recording position and skew of the recording paper in the recording of.

[0008]

【Example】

 FIG. 2 is a view showing an example of a back tension mechanism used in the present invention, and the same reference numerals are attached to the above-mentioned mechanisms. The back tension mechanism 61 has a tension applying body 611 and a friction rotor 612. The tension imparting body 611 includes a spring and a friction body made of metal such as brass at the tip of the spring. On the other hand, the friction rotor 612 is provided at the end of the recording paper 6 so as to rotate together with the recording paper 6 and contact the friction body. The friction rotor 612 can be made of resin or the like.

Since the tension applying body 611 and the friction rotor 612 are always in contact with each other, when the recording paper 6 is stationary, the rotation of the recording paper 6 is suppressed, and when the recording paper 6 is pulled out, that is, the rotation is performed. When it does, it creates a resistance that hinders this rotation. This resistance is different depending on the image recording device, so it cannot be determined unconditionally, but a force of about several Kg / cm ² is generated, and the resistance can be adjusted by adjusting the pressing force of the tension applying body 611. Can be changed.

If the guide roller 32 provided on the paper discharge side is 32a and the guide roller 32 provided on the paper supply side is 32b, the pressing force between the guide roller 32a and the platen roller 31 is greater than the above resistance force. It is set to a strong ten several Kg / cm ^2, whereas the pressing force of the Gaidoro over la 32b and the platen roller 31 is set to a very weak force as compared with the resistance force.

In this apparatus, since the back tension is given to the recording paper 6 when the recording paper 6 is pulled out, the floating portion of the recording paper 6 located between the guide rollers 32a and 32b on the platen roller 31 is lifted. The number of recording sheets is reduced, and the recording sheets come into close contact with the platen roller 31. When the recording paper 6 is further pulled out from this state, the recording paper 6 is substantially held and conveyed between the platen roller 31 and the guide roller 31a, and slides left and right between them in the traveling direction. Is positioned in the most stable state.

FIG. 1 is a diagram for explaining an idle feeding operation before recording in the apparatus of the present invention, which will be described below with reference to this diagram. (A) is a state at the time of starting the operation, and the recording paper 6 is positioned in a state of being floated on the platen roller 31, as shown in part a. Further, the platen roller 31 rotates in the recording paper feed direction to pull out the recording paper 6 in the traveling direction. At this time, the roll portion of the recording paper 6 is fixed so as not to move by the back tension mechanism 61. (B) is a state in which the recording paper is being pulled out, and like in (a), the a portion of the recording paper 6 is pulled out and the floating is gradually absorbed. Also in (c), the recording paper is being pulled out. The floating of the part a is absorbed and is in close contact with the platen roller 31. Further, the recording paper 6 is pulled out by the platen roller 31 and the paper discharge side guide roller 32a, and a back tension is applied to the portion b of the recording paper 6 by the action of the back tension mechanism 61. In this state, the recording paper 6 is pulled out while sliding between the platen roller 31 and the guide roller 32a left and right with respect to the traveling direction so as to be in the stable state. (D) shows the state at the end of the drawing, in which the recording length l is drawn out and the apparatus stands still. The mounting state of the recording paper 6 at this time is corrected to the stable state. (E) is a state in which the recording paper is pulled back, and the platen roller 31 is rotated in a direction opposite to the recording paper feeding direction to pull back the pulled-out recording paper 6. At this time, no force acts on the b portion, and the returned recording paper 6 is dropped by its own weight. Further, at this time, the roll portion of the recording paper 6 is pressed by the tension mechanism 61, so that the recording paper 6 pulled back forms a slack in the c portion. The pullback operation is performed until the recording length l is pulled back, and when the pullback operation is completed, the idling operation is completed. Then, as shown in (f), the thermal head 21 is positioned on the platen roller 31 and recording is performed.

Since this series of operations is performed every time before recording one image, the recording position in each image is always the same.

It should be noted that this series of operations is performed according to an instruction from the control mechanism 5. Therefore, the operation procedure may be stored in advance in a storage means such as a ROM in the control mechanism 5, and the control mechanism 5 may be configured to take out this operation procedure when a recording signal is detected.

[0015]

[Effect of the device]

 As described in detail above, according to the image recording apparatus of the present invention, a roll-shaped recording paper, a recording mechanism that forms an image on the recording paper, a paper feeding mechanism that performs a recording paper pullout or pullback operation, It is equipped with a back tension mechanism that gives tension to the recording paper when the recording paper is pulled out, and a control mechanism that allows multiple recordings on the same side of the recording paper based on instructions from the control mechanism. In the image recording apparatus configured to perform the recording paper, the recording paper is incomplete because the recording paper is pulled out by a predetermined length before recording and then pulled back. Even if it is mounted in a state, the state can be forced, and the effect that normal recording can be obtained is achieved.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an idle feeding operation in an image recording apparatus of the present invention.

FIG. 2 is a diagram illustrating a back tension mechanism in the image recording apparatus of the present invention.

FIG. 3 is an explanatory diagram illustrating a problem of a conventional device.

FIG. 4 is an explanatory diagram illustrating a conventional device.

FIG. 5 is an explanatory diagram illustrating a conventional device.

FIG. 6 is an explanatory diagram illustrating a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image recording device 2 Recording mechanism 21 Thermal head 3 Paper feeding mechanism 31 Platen roller 32 Guide roller 4 Cutter mechanism 5 Control means 6 Recording paper 61 Back tension mechanism 611 Tensioning body 612 Friction rotor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B41J 15/16 8306-2C

Claims (1)

[Scope of utility model registration request] 1. A roll-shaped recording paper, a recording mechanism for forming an image on the roll-shaped recording paper, a paper feeding mechanism for pulling out or retracting the roll-shaped recording paper, and the roll-shaped recording paper pulled out. A back tension mechanism that sometimes gives tension to the recording paper, and a control mechanism are provided.
In an image recording apparatus configured to perform recording a plurality of times on the same surface of a roll-shaped recording paper based on an instruction from this control mechanism, pull out a predetermined length of the roll-shaped recording paper before recording and then pull back An image recording apparatus comprising a control means for performing a blank feeding operation.