JPH033092A - Recording sheet carrying device and recording device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Application Field of the Invention] The present invention relates to a recording sheet conveying method applicable to a recording device, such as a printer or word processor used in a recording section of an electronic typewriter, facsimile machine, or personal computer. The present invention relates to a recording apparatus that performs recording on a recording sheet by applying the apparatus and its conveying apparatus. [Prior Art] Conventionally, rubber rollers have often been used as paper feed rollers used in this type of device. There was a problem in that the external dimensions changed due to shrinkage, and the conveyance amount of the recording medium was not constant. Therefore, it is possible to use a material with a small coefficient of thermal expansion, but it is less expensive than a rubber roller. The present invention was made to solve the above problems, and
The purpose of the present invention is to provide a recording sheet conveyance device and a recording device that can obtain a stable conveyance amount without causing an increase in cost. The recording sheet conveying device of the invention includes the following configuration: In the recording sheet conveying device that conveys the recording sheet, a conveying means for conveying the recording sheet, a detection means for detecting the ambient temperature, and a control means for controlling the conveyance amount of the recording sheet according to the temperature detected by the detection means.The recording apparatus of the present invention has the following configuration. In the apparatus, a conveyance means for conveying the recording sheet, a detection means for detecting the ambient temperature, a control means for controlling the conveyance amount of the recording sheet according to the temperature detected by the detection means, and the and a recording means for recording on a recording sheet. [Function 1] In the above configuration, the ambient temperature of the recording device is detected;
It operates to control the conveyance amount of the recording medium according to the detected temperature. Embodiment Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, in this example, in order to simplify the explanation,
The case of a word processor equipped with a serial type thermal printer will be explained. FIG. 1 is an external perspective view of the word processor in this embodiment. Keyboard 1 for inputting necessary data, etc.
It consists of a CRT (or LCD) 2 as a display device for displaying input data, an FDD 3 as a storage device, and a printer 4, the details of which will be described later, and 5 is a recording medium. FIG. 2 is an external perspective view showing details of the printer 4 in this embodiment. As shown in the figure, the recording medium 5 is pressed against the rubber portion 7a of the paper feed roller rough and the pinch roller 8 while being backed up by the platen 6. A gear 9 is attached to the shaft 7b of the paper feed roller 7, and is connected to the paper feed motor Ml via a reduction gear 9a having a gear ratio different from that of the gear 9. The paper feed roller 7 is rotated by the rotation of the paper feed motor Ml, and the recording medium 5 is conveyed. Next, the reciprocating movement of the carriage 10 will be explained. As shown in the figure, a shaft 11 is fixed in parallel to the front side of the platen 6, and a rack 12 is fixed to the opposite side of the carriage 10. The carriage IO is guided and supported by guide plates on the upper surface of the shaft 11 and the rack 12 so that it can move in the directions of arrows B and C. That is, the carriage lO is
It can reciprocate in a direction perpendicular to the conveyance path A of the recording medium. A belt 13, a portion of which is fixed to the carriage IO, is used for this reciprocating movement, and the belt 13 is stretched by a pulley 14 and a pulley gear 15. Pulley gear 15 is connected to carriage motor M2 via a reduction gear (not shown). The rotation of the carriage motor M2 causes the pulley gear 15 and the pulley 14 to rotate, and this rotation drives the belt 13, so that the carriage 10 reciprocates along the shaft 11. Further, a thermal head 16 is attached to the carriage 10 and is rotatably guided and supported around a head axis (not shown), and is pressed against the recording medium 5 by rotating in the direction of the platen 6 shown by the arrow. be done. By the pressure, the ink ribbon in the ink ribbon cassette 17 mounted on the carriage 10 can be transferred onto the recording medium 5. FIG. 3 is a sectional view of the paper feeding mechanism section. As described above, the paper feed roller 7 is connected to the paper feed motor M via the gear 9a.
The paper feed roller 7 is rotated by driving the paper feed starter Ml by a specified conveyance amount. A stepping motor is usually used as the paper feed motor M1, and by outputting a predetermined number of steps for the conveyance amount, the motor M1
to drive. Further, although metal has conventionally been used in many cases as the roller shaft 7b, relatively rigid plastic such as polycarbonate may also be used in some cases. and,
In most cases, rubber is used as the roller 7a in consideration of the need for a high coefficient of friction and cost considerations. However, because rubber has a higher coefficient of thermal expansion than metals (the coefficient of volumetric expansion is 6 to 7XIO-'/'C
whereas for metals it is 3~7 x l O-'/"C)
Changes with temperature are large. For example, in the roller shown in FIG. 3, when the roller whose radius is R at 25° C. rotates by an angle θ, the conveyance amount is expressed as L=Rθ. However, as the temperature rises, the roller also expands and its radius increases by △R.
+ΔR)θ, compared to the temperature of 25℃ mentioned above, (ΔR)θ.
R) The amount of conveyance is large by θ (as a result, the distance between the line and the previously recorded line becomes wider).In recent years, more and more images are being recorded, and the demand for paper feeding accuracy is increasing. In the case of recording, if the lines recorded last time and the lines recorded this time do not connect accurately, the value of the image will be lost.In other words, if the line spacing increases, gaps will be left between the lines.
The image will be recorded with white streaks. On the other hand, if the radius of the roller shrinks and becomes smaller due to a drop in temperature, the conveyance amount will also decrease, and although the line will be connected to the previously recorded line, on the contrary, an overlap will occur, resulting in a partial density difference between the lines. This would be a high record. Therefore, in this embodiment, as shown in FIG. 2, a thermistor Sl for temperature detection is provided on the printer control board P to detect the ambient temperature. In other words, the radius (diameter may also be used) of the roller 7a at a predetermined temperature T (for example, 25°C) is determined, the temperature T of the thermistor S1 is detected immediately before recording, and the temperature T and the previously determined temperature are Find the difference ΔT from T0. Next, the difference is multiplied by T by the volumetric expansion coefficient determined by the material of the roller 7a, and the increase/decrease in the volume of the roller 7a is calculated, and the radius (or diameter) of the roller 7a at the temperature T is determined. As mentioned above, the paper feed roller 7 is connected to the paper feed motor Ml via the roller gear 9 and the reduction gear 9a, and in order to obtain a predetermined conveyance amount, the number of drive steps of the connected motor Ml is Calculate according to the radius (or diameter) of Note that even if the thermistor St is not newly provided, the thermistor may be shared because a thermistor is used for printing heat correction in a thermal printer or the like. In addition, the thermistor S1 may be installed not only on the substrate P but also at any arbitrary position such as on the carriage 10. In that case, the difference between the temperature read by the thermistor and the ambient temperature of the roller 7a is measured. Just keep it and make corrections. FIG. 4 is a block diagram showing the configuration of the recording apparatus in this embodiment. Incidentally, in the diagram shown in FIG. 4, only the connection relationship of each block is shown, and detailed control lines are omitted. Also, the part surrounded by the dotted line is the CPU unit 40.
and controls the printer unit 4 and the entire apparatus. As shown in the figure, the CPU 41 is a central processing unit,
It reads programs and various data from the ROM 42, FD03, etc., which will be described later, performs necessary calculations and judgments, and performs various controls. Further, the CPU 41 can also be configured with a plurality of units. ROM42 is a read-only memory,
Various programs for the CPU 41 to operate, character code dot patterns (character generator, CG), and various data necessary for printing are stored. The RAM 43 is a read/write memory that temporarily stores data or calculation results issued by the CPU 41 (a working area and an interface section 44, and stores various data input from the keyboard 1, floppy disk FDD 3, etc.). The CPU unit 40 is connected to the printer unit via a thermal head driver 45, a motor driver 46, and a detector 47 which is a detection section for thermistors and various sensors. 4 and is connected to the thermal head driver 45.
is the printer unit 4 described above under the control of the CPU 41.
drive the thermal head 16 provided in the. Further, the motor driver 46 drives the paper feed motor Ml and the carriage motor M2 under the control of the CPU 41.
The detector 47 reads various sensors such as the thermistor S1 and a paper sensor (not shown) and a ribbon sensor (not shown) provided in the printer unit 4. Next, the power source 48 is a power source V for driving the thermal head 16.
H. Power supply for driving paper feed motor M1 and carriage motor M2 A. Power supply for driving floppy disk FDD3 VFDDI and power supply for other logic circuits V c
Supply c. Further, the controller 49 performs various controls such as transferring print data to the thermal head 16 described above, changing the voltage and current of the drive power source v14, and changing the heat time and duty under the control of the CPU 41. A keyboard l is connected to the CPLI unit 40 via a keyboard connector 50 for inputting various data necessary for printing, editing, etc. Further, a CRT 2 is connected to the CPU unit 40 via a CRT connector 51 for displaying data and various information input from a keyboard L. Note that other display devices such as a liquid crystal display may be used instead of the CRT 2. Furthermore, CPU
A floppy disk FDD 3 is connected to the unit 40 via an FDD connector 52. In addition, FDD
It is also possible to connect an 8-hard disk, external RAM, external ROM, etc. in place of 3. The CPU unit 40 has an interface connector 53.
It is also possible to connect an external interface such as R3232C: Centronics, modem (MODEM), etc., which allows an external control device to control the recording device and communicate with external equipment. Furthermore, although not shown in FIG. 4, it is also possible to connect an audio output device such as a buzzer. Note that the processing procedure showing control of the paper feed motor in this embodiment is a flowchart shown in FIG. The processing at each step (SL-34) is as already explained,
It is omitted here. As described above, in this embodiment, the diameter of the paper feed roller is corrected based on temperature detection by the thermistor, and the number of drive steps of the motor is changed to achieve a constant conveyance amount without depending on the ambient temperature. In addition, in this embodiment, a thermal head is used as the heating means, but the heating means is not limited to this, and it is also possible to use, for example, infrared rays or a laser beam, and furthermore, a heating means such as a wire head or the like can be used. It can be similarly applied to impact types, etc.Furthermore, in the above-mentioned embodiments,
Although the type in which the ink ribbon cassette is loaded on the carriage lO and moves reciprocatingly has been described, the present invention is not limited to this, and the present invention is not limited to this type, but may also be a type in which the ink ribbon cassette is stationary, or a line type type in which the carriage does not move reciprocally. The same can be applied to a recording device. In this example, a word processor was explained, but
The present invention is not limited to this, but can also be applied to output devices such as electronic tie writers or personal computers, line printers, thermal printers, inkjet printers, wire tod printers, and the like. [Effects of the Invention] As explained above, according to the present invention, there is an effect that a stable conveyance amount can be obtained without causing an increase in cost.

[Brief explanation of drawings]

Fig. 1 is an external perspective view of a word processor to which this embodiment is applied, Fig. 2 is a detailed external perspective view of a recording device according to this embodiment, Fig. 3 is a sectional view of the paper feeding mechanism of the printing device, and Fig. 4 is a block diagram showing the control system of the recording apparatus in this embodiment, and FIG. 5 is a flowchart showing the processing procedure in this embodiment. In the figure, 5... Recorded object, 6... Platen, 7...
Paper feed roller, 16...Recording head (thermal head). Patent applicant Canon Co., Ltd. Figure 3 Figure 5

Claims (2)

[Claims] (1) In a recording sheet conveying device that conveys a recording sheet, a conveyance means for conveying the recording sheet, a detection means for detecting an ambient temperature, and a recording sheet conveyance device that conveys the recording sheet according to the temperature detected by the detection means. 1. A recording sheet conveying device comprising: a control means for controlling the amount of conveyance of a sheet. (2) In a recording apparatus to which a recording sheet conveying device can be applied, a conveying means for conveying the recording sheet, a detecting means for detecting an ambient temperature, and a recording device configured to perform the recording according to the temperature detected by the detecting means. A recording apparatus comprising: a control means for controlling the conveyance amount of a sheet; and a recording means for recording on the recording sheet.