JPS6352566A - Recorder - Google Patents

Abstract

PURPOSE:To simplify the control from a picture signal output device by allowing any paper placing section to output a paper feed enable signal giving a constant time from the start of paper feed till the picture signal reception enable state to a picture signal generator. CONSTITUTION:A VDO signal (picture signal) fed from a reader is inputted to a laser driver 209, where the signal is converted into a laser beam based on the VDO signal in a semiconductor laser 210. The laser beam is focused by a collimator lens 210 and scanned by a polygon mirror 212 in nearly parallel with a drive shaft of a photosensitive drum 214 driven at a prescribed number of revolutions. The scanned laser beam is subjected to light quantity correction by an f-theta lens 213, radiated onto the photosensitive drum 214 and a latent image by the VDO signal is formed. In outputtting the VDO signal from a reader after a time from the generation of an electric signal (BD signal) till the arrival of the laser beam onto the photosensitive drum 214, the latent image is formed at a proper position on the photosensitive drum 214.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a recording device such as a printer.

This type of device can be provided with several types of paper placement sections on the printer side. However, the distances from these placement units to the recording units are often not mechanically the same.

In order to prevent misalignment of the recording device due to this difference, the timing of the image signal sent to the printer has been changed. As a result, the control circuit and method on the soda side sometimes became complicated.

The present invention relates to a recording device such as a printer that can be controlled from a development signal output device such as a reader or host.

FIG. 1 is an external view of an apparatus showing this embodiment. 1 in the diagram
is an image forming device (hereinafter referred to as a printer), 2 is a printer 1
3 is a pedestal that supports the printer 1 and the paper deck 2;

4 is connected to an image signal output device and outputs various operation instructions and images (
Transmission cable that transmits No. 8. Reference numeral 5 denotes an image signal output device, which in this embodiment is a document reading device (hereinafter referred to as a reader) that optically reads a document on a platen (not shown), converts it into an electrical signal, and outputs the electrical signal. The original reading and image signal modification I) method is a well-known technique, so the description thereof will be omitted.

FIG. 2 is a block diagram showing an example of the internal configuration of the printer.

As shown in FIG. 2, the serial signal from the reader 5 is
The data is input manually to the serial circuit 201 and processed by the CPU 200 .

The CPU 200 operates according to a control program stored in the ROM 203 and the RAM 204 .

Timer circuit 202. The I10 boat 205 is used to control the entire printer.

A human power interface 207 performs human power processing such as sensor signals such as paper detection in the printer. The drive circuit 208 is a circuit for driving a photosensitive drum drive motor, a charging high voltage transformer, etc. (not shown). The display circuit 206 is
Used to display printer status such as out of print paper and occurrence of paper jam.

The VDO signal (image (No. X) sent from the reader is
It is input to the laser driver 209 and the semiconductor laser 210
It is converted into laser light based on the VDO signal. The laser beam is focused by a collimator lens 210, and scanned by a polygon mirror 212 in a direction substantially parallel to the rotation axis of a photosensitive drum 214, which is rotated by a predetermined amount. The scanned laser beam undergoes light intensity correction by an f-theta lens 213,
The photosensitive drum 214 is irradiated with the VDO signal to form a latent image.

Image formation in printers uses a so-called electrostatic recording method, in which a necessary portion of the corona-charged charge on the photosensitive drum 214 is removed using a laser beam, and then developed using a developer and then exposed to the laser beam. The electrostatic recording method, which is performed by attaching toner to the irradiated area and transferring and fixing it onto printing paper, is a well-known technique, so a detailed explanation will be omitted.

Now, the laser beam scanned by the polygon mirror 212 is incident on the optical fiber 215 before being irradiated onto the photosensitive drum 214, and when the photodetector 216 detects the incident, it outputs an electric signal (BD double signal).

If Soda waits for the time from when the BD double signal is generated until the laser beam reaches the photosensitive drum 214 and then outputs the VDO signal, a latent image will be formed at an appropriate position on the photosensitive drum 214.

Figure 3 shows a timing chart of serial communication in which image signals and various instructions in the image signal transmission line 4 are encoded and communicated by serial communication, and signals necessary for image formation, in relation to the operations of the reader and printer. show.

When the copy start key is pressed in the reader, the reader outputs a copy start signal in the form of a serial code to the printer through the serial communication circuit. When the printer receives the copy start signal through the serial communication circuit, it turns on various parts such as the high voltage for pre-charging and starts the pre-rotation of the drum 214. When the pre-rotation for cleaning the drum surface, eliminating static electricity, etc. is completed and the image signal can be received, a paper feed enable signal is output to the printer beamer.

When the reader receives a paper feed enable signal from the printer, it outputs a paper feed instruction to the printer. When the printer receives the paper feed instruction signal, it starts transporting the paper from the paper feed cassette. When the paper reaches a position where it matches the latent image on the drum, an image reception ready signal is output to the reader. When the reader receives the image reception enable signal, it starts reading the document on the platen and outputs it to the printer as an image signal VDO.

When the printer receives the image signal, it performs image re-creation processes such as forming a latent image, transferring it to paper, and fixing it, and then discharges the paper out of the machine.

If a copy stop instruction has not been issued from the reader, the next paper feed enable signal is output in response to the completion of the cycle at the end of paper ejection or image formation, and the image of the second copy is regenerated in the same manner as described above. to accomplish.

The paper feed designation signal is counted in the operating section of the reader section (not shown), and when the set number of sheets has been regenerated, Soda outputs a copy stop instruction to the printer. When the printer receives a copy stop instruction, it does not issue a paper feed ready signal and performs tasks such as turning off the high pressure and cleaning the drum.
Performs a post-rotation for removal and then stops.

FIG. 4 shows the internal paper transport path of the printer. 22 is an upper cassette, 12 is a lower cassette, and each paper is fed by paper feed roller 2.
21, 228, 229 feed paper from each cassette or paper deck.

Then, it passes through each of the transport paths A, B, and C and reaches the registration roller 223 which is stopped. In this embodiment, the paths to the registration rollers become longer in the order of conveyance path A from the upper cassette, conveyance path B from the lower cassette, and conveyance path C from the paper deck. It is transported by driving the registration rollers 223. Then, the leading edge of the latent image on the drum 214 is transferred in synchronization with the leading edge of the paper, passes through the conveying section 224, passes through the fixing device 225, and is discharged from the machine through the opening 226. 241.231 in the figure
, 230 are photo sensors that detect paper jams.

FIG. 5 is a flowchart of the control operation by the microcomputer of the printer. Copy start signal -
When instructed to input a code via serial communication from the controller (S
TP501), starts the aforementioned drum forward rotation (STP
502). When the pre-rotation is completed (STP504), a paper feed enable signal is output (STP505). If the copy operation is in progress even if the copy start key is not input (STP5
03) Outputs paper feeding possible in synchronization with the completion of previous paper ejection.

When the upper stage sheet feeding instruction is received (STP506), wait for the difference in distance ffi[t C-A (7) shown in FIG. 4 (STP507), and then drive the upper stage cassette sheet feeding roller (STP508). When the lower paper feed instruction signal is received (
STP509), waits for the distance MC-B difference shown in FIG. 4 (STP510), and drives the lower cassette paper feed roller (STP511). When the vapor deck paper feed instruction signal is input manually (STP512), the vapor deck paper feed roller is driven (STP513). If neither paper feed instruction signal is received, it is determined whether an intermediate stop instruction or a copy stop instruction due to completion of the desired number of copies has occurred (5TP514), and when a copy stop instruction signal is received, the drum rear rotation (drum potential 5TP515), and after a predetermined period of time, the drum is stopped (STP516).

When paper feeding starts, a certain period of time (distance 1I shown in No. 4121)
C, therefore, at the timing between each stage, the registration roller 2
23)) and outputs an image reception ready signal (STP518).

When the image signal from soda is input (STP519)
, performs image forming operation (STP520), removes the resist, transports the paper, and discharges the paper outside the machine after transfer (STP521)
. Then, the process returns to the copy restart determination.

In this embodiment, the printer outputs an image reception ready signal to the reader at different timings depending on the paper feed stage, but since the time from the paper feed instruction from the reader to the image signal from the reader is constant, it is possible to receive the image. It is also possible to omit the signal.

As described above, by making the time until the start of image input in the printer constant, control from an image signal output device such as a reader can be simplified even if the paper feeding path is different. Also, the optical system is amazing! The image signal output device of a reader such as a document reading device that performs 3IHJ requires a run-up section of the optical system before reading starts, so if the period from paper feeding to image signal output is constant, a certain timing after outputting the paper feeding instruction is required. By starting the operation of the optical system at , there is no need to change the timing for each paper feed stage, making control easier.

[Brief explanation of drawings]

Fig. 1 is an external view of an apparatus embodying the present invention, Fig. 2 is an internal circuit diagram of the image forming apparatus, Fig. 3 is a timing chart during image forming operation, and Fig. 4 is a paper conveyance path diagram of the image forming apparatus. , Atsushi 5 is a flowchart of the image forming apparatus. 1 is a printer, 2 is a vapor deck, 4 is a transmission cable,
5 is the leader.

Claims (1)

[Claims] In a recording device that has multiple paper placement units and receives image signals to form images, paper feeding is such that the time from the start of paper feeding to the time when image signals can be received is constant for all paper placement units. A recording device characterized in that it outputs a possible signal to an image signal generator.