JPS63315280A - laser beam printer - 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 [Field of Industrial Application] The present invention relates to a laser beam precipitator, and particularly to a notification mechanism for an operator suitable for preventing slanted printing and paper jams.

[Conventional technology]

Some laser beam precincts are of a clamshell type that opens and closes vertically around a support point to facilitate maintenance and repair. Conventionally, the method has been to provide a detection means for detecting whether or not the clamshell is in a closed state, and to cut off the entire power supply or only the high-voltage part.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, if a state in which the clamshell is not completely closed occurs, no consideration is given to notifying the operator of this state, and the operator may operate the clamshell without noticing the state. There were problems with slanted printing and paper jams.

The purpose of the present invention is to solve this problem.

[Means for solving problems]

The above object is achieved by providing a detection means for detecting opening/closing of the clamshell, a processing means for processing the output of the detection means, and a notification means capable of notifying the operator by the processing means. .

[Effect]

The detection means for detecting the open/closed state of the clamshell detects the open/closed state of the clamshell and outputs the information to the processing means. The processing means receives the information and operates the notification means. This action allows the operator to recognize that the clamshell is not completely closed and pushes the clamshell down until it is completely closed. Thereby,
The laser beam printer has a completely closed clamshell,
It can be operated without slanting the print or causing paper jams.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The main body has a clamshell structure that is large and wide vertically centering on support points 10 and 11, and has an upper main body 1 and a lower main body 2.
It consists of The upper part 1 of the main body is biased by a spring or the like so that it is in the open state as shown in FIG. When closing, the operator pushes the upper side 1 of the main body from above. At that time, the left hook 3 and right hook 4 are
The clamshell is caught in the left lock claw 5 and right hook claw 6 fixed to the lower side of the main body, and the closed state of the clamshell is maintained. The left sensor 7 and the right sensor 8 detect whether each hook is completely caught in each lock claw. Reference numeral 9 denotes a display whose display contents change depending on the output of the sensor 7.8. 13 is a general commercial AC power supply supplied from outside the main body.

14 is a switch attached to the main body, and 17 is a clamshell switch that detects whether or not the clamshell is closed. This is to prevent danger when the clamshell is opened, and it cannot be detected whether the clamshell is completely closed or not. 15 is a general commercial AC power supply 1
This is a general DC power supply that converts 3 to DC.

Reference numeral 12 denotes a control circuit which is operable by the voltage supplied from the DC power supply 15, receives the output signal from the sensor 7.8, processes it internally, and controls the internal display of the display 9.

With this configuration, after the operator completes maintenance or repair, the operator closes the clamshell and can only catch the left hook 3 and the left locking claw 5, or the right hook 4 and the right locking claw 6. If so, the left sensor 7 or the right sensor 8 detects the state and sends an output signal to the control circuit 12. When the control circuit 12 receives these signals, it processes them internally and outputs the results to the display 9.

If the present invention is not used, the operator will print without noticing the one side closed state, and paper jams may occur due to insufficient paper conveyance capacity, or the left and right paper conveyance capacity may be insufficient. Due to the non-uniformity, the paper is conveyed diagonally and the printed characters become slanted. Therefore, according to the present invention, these problems can be avoided because the operator notices the one-sided closed state.

The sensors 7 and 8 are specific examples of detection means, and various sensors and detection methods are possible. Examples include a photointerrupter, a proximity sensor, a microswitch, etc. FIG. 3 shows an example of detecting the tip of the left hook 3 using a microswitch.

Further, although the display 9 in FIG. 1 is shown as an example of the notification means, concrete examples include a liquid crystal display and an LED display, and furthermore, a method using a sound such as a buzzer is also considered. The control board 12 is also an example of processing means, and there is a method in which the signals from the sensors 7.8 are processed by a microcomputer or a logic gate.

Here, if the clamshell is completely open, both sensors 7, 8 will detect its open state, and if it is completely closed, both sensors 7, 8 will also detect its closed state. Therefore, when one side is closed, the open state of only one side is detected and the closed state of the other side is detected, so that the processing of the control board 12 can be simply configured using a general exclusive OR.

Next, we will explain the simplest example of operating the indicator 9 when at least one of the sensors 7.8 detects an open state.
It is shown in the figure. Sensors 7 and 8 are used with normally closed terminals (NG), and when the clamshell is open or one side is closed, at least one of the left sensor 7 and right sensor 8 is closed, and the display 9 is The LED 15 lights up to alert the operator. Furthermore, when the clamshell is opened to a large extent, the clamshell switch 17 is turned off as shown in FIGS. When the clamshell is completely closed, both the left sensor 7 and the right sensor 8 are open, and the LED 15 of the indicator 9 is turned off.

In the above embodiment, two sensors are provided as detection means, but more than two sensors are also possible.

〔Effect of the invention〕

According to the present invention, since it is possible to notify the operator of the partially closed state in which the clamshell is not completely closed, there is an effect of preventing the occurrence of paper jams and defective printing such as slanted printing.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view of an embodiment of the present invention, FIG. 2 is a block diagram, FIG. 3 is a detailed left side view of FIG. 1, and FIG. 4 is a detailed example of FIG. 2. It is a block diagram.

Claims (1)

[Claims] 1. In a laser beam printer that can be opened and closed vertically around a certain support point and is provided with holding means at a plurality of locations to maintain the closed state, a plurality of detection means for detecting the open and closed state; A laser beam printer comprising: processing means for processing the output of the detection means; and notification means operated by the processing means.