JPS6243385B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reproduction electronic transmission device that transmits position signals indicating the leading and trailing edges of a document that are continuously transmitted.

Normally, the position signal is used as a cutter signal, a count signal for the number of received sheets, a stamp drive signal such as the reception time, etc. on the copying electronic transmitter/receiver side (hereinafter referred to as the receiving side), but it can also be transmitted continuously using a plane scanning method. In a reproduction electronic transmission device, phase signals and image signals are generally continuously transmitted even at the joint between two documents, so unless the position signals of the leading edge and trailing edge of the document are transmitted, the receiving side will not be able to recognize the original. Detecting seams in a document is very difficult.

In order to solve this problem, a method is generally adopted in which a specific frequency is transmitted from the replica transmission transmitter side (hereinafter referred to as the transmitter side) to the receiver side for several seconds at the joint. However, the method requires a signal generating circuit, a signal sending circuit, etc. on the transmitting side, and requires a signal detecting circuit for the specific frequency on the receiving side. Moreover, since the signal detection circuit on the receiving side prevents malfunctions due to image signals, the circuit configuration is complicated and expensive.

On the other hand, even with a copying electronic transmission device capable of continuous transmission, it is possible to easily detect the seam of a document by sending one document at a time, just as with a single-plane copying transmission device, but with this method, the seams are started and stopped for each document. , it takes extra time for transmission and line charges become a problem.

An object of the present invention is to provide a simple and inexpensive reproduction transmission device to solve these problems.

According to the present invention, when the leading edge and trailing edge of the document pass through the photoelectric converter on the transmitting side, the phase signal and image signal are stopped for N scans (N is selected so that the copying electric transmitter/receiver does not stop). By setting the signal period and using a counter, timer, etc. on the receiving side, if the no-signal period continues for more than M scans (M < N), it is assumed that the signal is from the leading edge or trailing edge of the document, and the copying transmission/reception device This means that the leading or trailing edge of the document can be easily detected without having to stop each document one by one. Normally, if there is no signal for a few seconds on the receiving side, the device will stop and will be unable to receive the next document.
The no-signal period is set to around 1 second.

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

In FIG. 1, the synchronizing pulse (phase pulse) shown in FIG. The image signal shown in FIG. 2c is added. The mixing circuit 3 mixes these two signals, and the waveform d of the output 19 passes through the gate circuit 4, is modulated by the modulator 5, is amplified by the line amplifier 6, and is sent from the line terminal 7 as a signal of the copying transmission transmitter on the receiving side. will be sent by wire.

By the way, the gate circuit 4 uses the output 13 of the signal erasing pulse generation circuit 18 to generate the output 19 of the mixing circuit 3.
It controls whether or not to transmit the information to the modulator 5. The operation of the signal erasing pulse generation circuit 18 will be explained below. A photoelectric conversion unit that detects the presence or absence of a document (the detection method is outside the scope of the present invention and will not be described in detail, but in a reproduction transmission transmitting device capable of continuous transmission, a document detection element is generally installed at or near the photoelectric conversion unit). An output signal a is provided, which constantly monitors the presence or absence of a document in the photoelectric conversion unit and controls the start and stop of the copying electronic transmission device.
is input from 8, and the edge detection circuit 9 extracts the clock pulse e at the point of change in the waveform, and sets the flip-flop 10. The output f is ANDed with the phase pulse 2 in an AND circuit 11,
It is used as the clock pulse g of the 4-bit binary counter 12. The 1/4 frequency divided output 13 of the counter circuit 12 controls the signal gate circuit 4 as the phase erase pulse h. The waveform of the output 20 becomes k, and the image signal and phase signal are stopped. This waveform k is put on a carrier by a modulator 5 and amplified, and then outputted from a line terminal 7. The envelope of the modulated wave at this time is shown in l. Therefore, the transmission signal includes signals at the leading edge 21 and trailing edge 22 of the document as shown in l.
The image signal and phase signal corresponding to two phase pulses, that is, two scans (in this embodiment, N=2) are respectively erased. Here, the waveform i of the 1/8 frequency divided output 14 passes through the NOT circuit 16, and is ANDed with the 1/16 frequency divided output 15 in the AND circuit 17, and the flip-flop 10 is cleared by the AND output j. That is, the counter output 13 generates the signal erasing pulse h only for two scans. On the other hand, on the receiving side, if no signal is detected for 1.5 scans or more, it can be assumed to be the leading edge or trailing edge of the document, and it is possible to easily detect a seam in continuously fed documents.

Incidentally, in the above embodiment, the case where N=2 was taken up, but the no-signal period is sufficient as long as the receiving device does not stop, and therefore N does not need to be an integer. 3
As shown in the figure, the output signal shown in FIG. 4a indicating the presence or absence of a document is inputted to the edge detection circuit 9, and the output signal shown in FIG. 4b is input to the edge detection circuit 9.
It is clear that the same effect can be obtained by directly connecting the signal canceling pulse to the mono-multivibrator 23 to obtain the signal canceling pulse shown in FIG. 4c.

As explained above, according to the present invention, the drawbacks of the conventional copying electric transmission device can be solved, and a simple and inexpensive copying electric transmission device can be realized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a waveform diagram explaining the operation, FIG. 3 is a block diagram of another embodiment, and FIG. 4 is a waveform diagram explaining the operation of FIG. 3...Mixing circuit, 4...Signal gate circuit, 5...
... Modulator, 6 ... Line amplifier, 9 ... Edge detection circuit, 10 ... Flip-flop, 12 ... 4-bit binary counter, 23 ... Mono multivibrator.

Claims (1)

[Claims] 1. Means for detecting the leading edge and trailing edge of the passing document;
It includes a document reading means, a synchronization signal generation means, and a mixing circuit that mixes an image signal outputted by the document reading means and a synchronization signal outputted from the synchronization signal generation means, and continues until the end of scanning a plurality of documents. In a reproduction electronic transmission device that transmits a synchronizing signal every time an image signal for one main scan is transmitted, the device is configured such that the document reading means scans the trailing edge of one document that has been scanned and the next document that is to be scanned. 1. A copying electric transmission transmitting device characterized by comprising a signal erasing means for making the output signal of the mixing circuit into a non-signal state for N (N is 1 or more) scanning times when the leading edge of the mixing circuit is detected.