JPS62144469A - Image recorder - Google Patents

Abstract

PURPOSE:To record an image on an accurate position of recording paper even if the number of revolutions of a motor is fluctuated by providing a rotary encoder in parallel with a recording paper driver roller and recording the image synchronously with an output signal of the rotary encoder. CONSTITUTION:A rotary disc 102 is fixed on a shaft of an encoder gear 101 in a rotary encoder 81 and a light emitting element 103 and a light receiving element 104 are provided oppositely via the disc 102. The disc 102 is provided with a slit S and a detection signal is generated from the light receiving element 104 when photosensitive paper is carried by one line. The said encoder 81 is interlocked with a recording paper drive roller 10 via gears, a thermal head 1 is depressed on a platen 2 on which the thermosensitive paper is wound, the roller 10 is driven, a recording control circuit 11 applies a recording signal by one line to the head 1 synchronously with a detection signal of the encoder 81 to apply thermosensitive recording sequentially. Thus, even if the number of revolutions of a motor 7 is fluctuated, a recording image with high recording position accuracy is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to various image recording apparatuses such as printers, and particularly to recording paper conveyance means.

Conventional technology In general, the accuracy of the recording position of images recorded by an image recording device such as a printer has a significant effect on the recording quality, so how accurately the recording paper is conveyed and recorded is a key factor in configuring the device. This is an important point. Conventionally, this type of printer has a rotary encoder installed on the main shaft of the motor, detects the output signal of this rotary encoder, controls the motor speed to be constant, and runs the recording paper at a constant speed. I was recording.

FIG. 3 shows an example of the prior art. 1 is a thermal head, which has a plurality of heating elements R arranged in a line as shown in the figure, and is connected to a recording control circuit by a connector C to enable line recording. 2 is a platen, and a gear 4 is attached to a rotating shaft.

A gear 6 is attached to the rotating shaft of the motor 7, and the intermediate gear 5 connects the gears 4 and 6 to interlock the motor 7 and the platen 2. Wrap the thermal paper 3 around the platen 2, and while pressing the thermal head 1 onto the platen 2,
The motor 7 rotates the platen 2 in the direction of the arrow in the figure, and recording signals are sequentially applied to the thermal head 1 to perform thermal line recording. A rotary encoder 8 is attached to the rotational axis of the motor 7, and is adapted to detect the rotational speed of the motor 7.

This is a constant speed rotation control device for a nine motor 7, and the motor 7 is rotated at a constant speed by feedback of a detection signal from a rotary encoder 8.

Problems to be Solved by the Invention However, in this type of printer, the load on the motor varies greatly, so it is very difficult to control the motor's rotation at a constant speed with high precision using such conventional technology. It was difficult to obtain recorded images with high recording position accuracy. Furthermore, the higher the accuracy of constant speed rotation control of the motor, the more complicated the constant speed rotation control device becomes, resulting in a disadvantage that the device becomes more expensive. The present invention eliminates the above-mentioned drawbacks and provides an image recording device that can obtain recorded images with high recording position accuracy at a low cost with a relatively simple configuration. A driving roller, a recording means, and an interlocking mechanism for interlocking the motor and the recording paper driving roller, a rotary encoder is connected to the recording paper driving roller, and the rotary encoder is synchronized with an output signal of the rotary encoder. , the recording means performs image recording.

Operation By using the present invention, the amount of conveyance of the recording paper can be accurately detected by the rotary encoder connected to the recording paper drive roller, and the output of this rotary encoder can be compared with the previous one. Because casting is performed, even if the motor rotation speed fluctuates, it is possible to record at the correct position on the recording paper.

Embodiment FIG. 1 shows an embodiment of an image recording apparatus according to the present invention. Reference numeral 1 denotes a thermal head, which, like the conventional example shown in FIG. 4, has a plurality of heating elements R arranged in a line, making it possible to perform line recording. 1o is a recording paper driving roller, and a gear 4 is attached to the rotating shaft. A gear 6 is attached to the rotating shaft of the motor 7, and a gear 4.6 is connected by an intermediate gear 5, so that the motor 7 and the recording paper drive roller 10 are interlocked. Thermal paper 3 is wound around a platen 2, the thermal paper 3 is sandwiched between a recording paper drive roller 10, and the recording paper drive roller 10 is rotated in the direction of the arrow in the figure to convey the thermal paper. or,
The recording paper drive roller 10VC is provided in conjunction with a rotary encoder S. FIG. 2 shows the detailed configuration of the rotary encoder S, in which a rotating disk 102 is placed on the rotating shaft of the encoder gear 101,
The light-emitting element 1o3 (!: light-receiving element 104 is provided to face the light-emitting element 1o3 (!) through this rotating disk 102.
2 is provided with a sleeve) S at a predetermined pitch angle,
When the light from the light emitting element 103 passes through the slit S,
A detection signal is generated from the light receiving element 104. The array pitch angle of the slits S is set so that the amount of movement of the predetermined six thermal papers for one line of recording corresponds to one pitch of the slit S. In other words, the amount of movement of the thermal paper for one line of recording corresponds to the amount of movement of the thermal paper for one line of recording. When the pitch angle of the slits provided in the rotating disk is set to the rotation angle of the corresponding recording paper drive roller, and the connection gear ratio between the rotating disk and the recording paper drive roller is P, the relationship K/P=S is obtained. Therefore, when the thermal paper is conveyed by one line by the recording paper drive roller, a detection signal is generated from the light receiving element 104. The rotary encoder S thus configured is connected to the recording paper drive roller 10 by connecting the encoder gear 101 and the gear 4. Wrap the thermal paper around the platen 2, press the roller head 1, rotate the recording paper drive roller 1o, and press the recording control circuit 1.
1, a recording signal for one line is applied to the thermal head 1 in synchronization with the detection signal of the rotary encoder S, and thermal recording is sequentially performed. Therefore,
Even if the rotational speed of the motor 7 fluctuates due to changes in the load applied to the motor, it is possible to record one line in exact synchronization with the amount of movement of one line of thermal paper, ensuring high recording position accuracy. This means that a recorded image can be obtained.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention comprises a motor, a recording paper driving roller, a recording means, and an interlocking mechanism that interlocks the motor and the recording paper driving roller. A rotary encoder is connected to the
Recording is performed by the recording means in synchronization with the output signal of the rotary encoder, and even if the rotation speed of the motor fluctuates, recording can be performed at an accurate position on the recording paper, and the present invention is used. This makes it possible to obtain a recorded image with high recording position accuracy.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the overall configuration of an image recording device according to an embodiment of the present invention, FIG. 2 is a perspective view of a rotary encoder used in the same device, and FIG. 3 is a perspective view showing the overall configuration of an image recording device in a conventional example. FIG. 4 is a perspective view showing a schematic configuration of the thermal head. 1... Thermal head, 2... Platen, 3... Thermal paper, 4.5.6... Gear, 7... Motor, 1o... Recording paper drive roller, 11... Recording control circuit, S...
...Rotary Nijikogu-1101...
Nijikogu - Gear, 102...Rotating disk, 10
3... Light emitting device, 1 Q4... Light receiving device Name of agent Patent attorney Hiroshi Nakao and 1 other person 1st
Figure 2

Claims (6)

[Claims] (1) Consisting of a motor, a recording paper driving roller, a recording means, and an interlocking mechanism that interlocks the motor and the recording paper driving roller, a rotary encoder is connected to the recording paper driving roller, and the rotary encoder An image recording device that records an image by the recording means in synchronization with an output signal of the image recording device. (2) A rotary encoder is formed by a rotating disk provided with a plurality of slits, and a light-emitting element and a light-receiving element provided facing each other through the disk, and the rotary encoder is provided in conjunction with a recording paper drive roller. , an image recording device according to claim 1. (3) The image recording apparatus according to claim 1, wherein the motor and the recording paper drive roller are interlocked by gears. (4) The image recording apparatus according to claim 1, 2, or 3, in which a recording paper drive roller and a rotating disk provided with a plurality of slits are interlocked by gears. (5) A rotation angle of the recording paper driving roller corresponding to the amount of conveyance of the recording paper for one recording line, or a rotation angle of the recording paper driving roller corresponding to a predetermined amount of conveyance of the recording paper, is provided on the rotating disk. Image recording according to claim 4, which satisfies the relationship K/P=S, where S is the arrangement pitch angle of the slits, and P is the coupling gear ratio between the rotating disk and the recording paper drive roller. Device. (6) sandwiching a recording paper between a recording paper drive roller and a platen roller, pressing a recording means against the platen roller via the recording paper, and rotating the recording paper drive roller to convey the recording paper; The image recording apparatus according to claim 1, wherein recording is performed by the recording means.