JPH03102419A - Video signal switching device - Google Patents

Abstract

PURPOSE:To connect the external devices of plural personal computers to a single printer requiring the input of video signals by attaining the connection between the output terminal of a controller and the input terminal of a video signal selector of the preceding stage so as to secure the vertical connection of many video signal switching devices. CONSTITUTION:For instance, a user of a personal computer 3 pushes a print switch 9b at the time of printing the pictures of a monitor 7. Thus the video signals of the computer 3 are selected by a video signal switching device 5B and an in-use signal is produced via a signal cable 5b as long as a printer 1 is not in use. Thus the device 5B outputs the signal of a cable 5b to a cable 5a and inputs it to the printer 1. As a result, the video signals of the computer 3 are inputted to the printer 1. Thus plural personal computers can be connected to a single printer 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video signal switching device, and particularly to a video signal switching device that is connected between a plurality of personal computers and a printer that prints their videos.

[Conventional technology]

Conventionally, switching of such video signals has been carried out as follows. As shown in FIG. 4, a system using such a video signal switching device includes a plurality of personal computers 1-01, 102, and 03, and each personal computer 1-01.
,,]--Each monitor 104, 105, 106 connected to 〇2, 103 and printer 107
It consists of The printer 1-07 prints images using video signals from the monitors 104, 1, 05, and 1.06. For example, if an image of a signal from the video output section of the personal computer 103 is first printed by the printer 107 and then an image from the personal computer 102 is to be printed, it is necessary to switch the connection between the personal computer 102 and the printer 107. be. In this way, the connections between the necessary personal computers and the printer "-07" are sequentially switched and the signal sources are exchanged.

[Problem to be solved by the invention]

However, according to the above-mentioned conventional technology, since multiple computers share one printer, changing the connection between the printer and the computer in order to print the necessary images takes a lot of effort and greatly reduces work efficiency. There was a problem with doing that.

The video signal switching device of the present invention has been developed in view of the above-mentioned conventional problems, and its purpose is to be able to switch the video signals of multiple devices with a simple operation, and to make it possible to switch the video signals of multiple devices with a simple operation. An object of the present invention is to provide a video signal switching device that does not require connecting or disconnecting cables.

[Means to solve the problem]

``In a video signal switching device that selects and switches one video signal to be printed by a printer from a plurality of video signals input from a plurality of external devices having the following purpose, selection of the video signal of the external device to be printed. and a video signal selection device that, when the video signal of the preceding external device is selected, cuts off the subsequent video signal and sends the video signal of the preceding external device to the printer, The video signal switching device is configured such that the output terminal of the control device can be connected to the input terminal of the preceding video signal selection device so that a large number of video signal switching devices can be connected in series.

[Effect]

Thus, the video signal switching device of the present invention includes a video signal selection device and a control device that determines selection of a plurality of video signals.

A print start command is sent by pressing a switch or the like on the control device. Thereafter, it is confirmed whether the printer is in operation or not, and the video signal selection device selects the video signal of the personal computer whose print switch has been pressed, and outputs it as signal S to the printer. At this time, when the printer receives an inuse signal, it starts printing an image using a video signal. When a series of prints is completed, the printer outputs a reset signal. When the video signal switching device receives a reset signal from the input section, the data selector controls the signal S to switch from the signal b to the signal a, and further stops generating the in-use signal and returns to the initial state.

In this way, a plurality of personal computers can be connected to the printer stand and switching is easy, so work efficiency is greatly improved.

〔Example〕

Hereinafter, the present invention will be explained based on illustrated embodiments. 1st
Referring to the drawings, FIG. 1 shows the structure of a system using the video signal selection device of the present invention.

In the diagram, a printer 1 is arranged.

In this embodiment, three personal computers 2, 3,
4 is connected to printer 1. PC 2, 3,
4 is a video signal switching device 5A. , 5B, and 5C, respectively. The video signal switching devices 5A, 5B, and 5C are connected to each other by signal cables 5as5b15C, and print switches 9a, 9b, and 9c are connected to the video signal switching devices 5A, 5B, and 5C.

Next, a detailed diagram of the video signal switching device 5 will be explained with reference to FIG. The video signal switching devices 5A, 5B, and 5C have a data selector ↓0 as a video signal selection device. The data selector 10 is connected to a video signal input section 1.1 and a video signal output section 30 for receiving a video signal a from the next device, and is further connected to a video signal input section from a personal computer 2 connected to the video signal switching device 5. 1-2. Further, a video signal output section 13 for outputting to the monitor 6 is provided. Further, the signal S selected between the signal a and the signal b from the data selector 1-0 is transmitted to the video signal output section 16.
The signal is sent to the printer 1 via the signal cable 5a.

On the other hand, it has a control logic 14 as a video signal control device. The control logic 14 is connected to the data selector 1-0, and also receives an in-use signal terminal 15 and a reset (R) signal from the printer 6.
An in-use signal and a reset/so-to signal are sent from the printer 1 through the terminal 16 and connected to the control logics 1 and 4, respectively, while the in-use signal terminal 7
and is sent from the reset signal terminal 1-8 to the subsequent video signal switching device 5B.

Further, a print switch 9a is connected to the control logic ↑4, and is configured to send a print start signal to the control logic 14. The reference numeral 20 is a power output section on the printer side, and the power is supplied from this power output section 20 to the power input section 21 of the video signal switching device 5A.
- is supplied to the video signal switching device 5A, and sent from the power output section 22 to the subsequent video signal switching device 5B.

Next, the operation of the video signal switching device 5A of the present invention will be explained using the flowchart shown in FIG. First, when the user prints an image on the personal computer 2, the user presses the print switch 9a (step 100).

The control logic 14 is the print switch 9a.
When receiving a signal from printer 1, if an In uSe signal is not sent from printer 1 indicating that printer 1 is in use (on step 10), send a signal switching signal to data selector ↑0. Send. That is, the data selector 10 normally selects signal a of the video signal from the next device and sends it out as signal S, but it switches to signal b from the video signal switching device and outputs it as signal S to the printer ↓ Send to. The image signal output section 30 outputs the signal input to the video signal input section 11 (step "
-02). At this time, control logic 1.4
is a printer], and a subsequent video signal switching device 5B,
An in-7 use signal is generated from the output section 1-7 for 5C (step].03). When the printer 1 receives an in-use signal from the input section 23, it starts printing an image using a video signal from the video signal input section 25. When a series of prints is completed, a reset signal is output from the output section 24 on the printer. Next, when the video signal switching device 5A receives a reset signal from the input unit 6, the control logic 14 controls the data selector 4 to switch the signal S from the signal b to the signal a (step 105). Further, the generation of the in-use signal is stopped (step 106), and the process returns to the initial state.

Next, for example, when the user of the personal computer 3 wants to print the image on the monitor 7, he or she presses the print switch 9b. At this time, if the printer 1 is not in use, the image signal of the personal computer 3 is selected by the video signal switching device 5B, and an in-use signal is generated via the signal cable 5b. The signal from the cable 5b is output to the signal cable 5a and input to the printer 1. As a result, the video signal from the computer 3 is input to the printer. When the print output of printer 1 is completed,
Print switch 9a %9b by reset signal,
You can now press 9c.

Note that in this embodiment, the print switches 9a, 9
b, 9c are video signal switching devices 5A. Although it is provided externally to the video signal switching device 5B and 5C, it may also be provided in the main body of the video signal switching device.
, 4 can also be controlled. In addition, each of the video signal switching devices 5A, 5B, and 5C of this embodiment can only connect one personal computer, but by providing multiple print switches or a print changeover switch, one device can connect to multiple computers. It is also possible to implement input. However, at this time, the data selector selects one of three or more input signals.

The present invention is not limited to the embodiments detailed above, and various changes can be made without departing from the spirit thereof.

1-0 [Effects of the Invention] Since the present invention has the above structure, a plurality of external devices such as personal computers can be connected to one printer that requires input of a video signal.

Further, when connecting to one printer, the effort required to change the connection as in the past can be reduced, and work efficiency can be greatly improved.

11-...Video signal input section 15... In-use signal terminal 1000...Reset terminal

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a system using the video signal switching device of the present invention, FIG. 2 is a detailed explanatory diagram of the video signal switching device,
FIG. 3 is a flowchart of the video signal switching device, and FIG. 4 is a schematic diagram of a system using the conventional video signal switching device. 1...Printer, 2, 3, 4...PC 5A, 5B, 5C...Video signal switching device 6, 7, 8...
...Monitor 9a. 9b,. 9c...Print switch 10...Data selector

Claims (1)

[Claims] 1. In a video signal switching device that selects and switches one video signal to be printed by a printer from a plurality of video signals input from a plurality of external devices, the video signal of the external device to be printed is and a video signal selection device that cuts off the subsequent video signal and sends the video signal of the preceding external device to the printer when the video signal of the preceding external device is selected. A video signal switching device comprising: an output terminal of a control device connectable to an input terminal of a preceding video signal selection device so that a large number of video signal switching devices can be connected in series. 2. The control device determines the video signal of the external device based on an in-use signal indicating that the printer is in use, a reset signal indicating the end of printing, and a signal from a print switch connected by the control device. 1. The video signal switching device according to 1. 3. The video signal selection device cuts off the video signal of the subsequent stage and sends the video signal of the preceding external device to the printer according to the signal that determines the selection of the video signal of the control device. 2. The video signal switching device according to 2.