JP2522707Y2 - Facsimile machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a facsimile apparatus connected to a two-wire telephone line.

[Prior Art] FIG. 3 is a block diagram of a facsimile apparatus when a conventional external telephone is used. In FIG.
L relay, (2) DC closing circuit in FAX, (3) external telephone, (4) hook switch in the telephone, (5) DC closing circuit in the telephone, (6) exchange.

Next, the operation will be described. In FIG. 3 (a), FA
When the CML relay in X (1) is on the M side, the telephone line is closed by the DC closing circuit in FAX (2). (FIG. 3 (b) Ta period) Then, the CML relay (1) is moved to the B side to switch the telephone line to the external telephone (3). At this time, the hook switch (4) in the external telephone (3) has already been turned on, and the telephone line is DC-closed by the DC connection circuit (5) in the telephone. (Third
Figure (b) Tb period) Incidentally, the external telephone (3) during this time for unspecified, since FAX in CML relay by the phone (1) when M side is disconnected from the T ₁ / T ₂ lines No current is supplied to the telephone, and it takes time to complete the DC connection completely even if the telephone line is switched to the telephone by switching the CML relay (1) to the B side (capacitive load This may be due to charging time, etc., in which case the external telephone (3)
gh impedance, and as shown in FIG. 3 (b), the period T (the period until the DC connection is completed) is performed by the exchange (6).
In contrast, an abnormal pulse P is generated due to the fax side.

[Problem to be Solved by the Invention] Since the conventional facsimile apparatus is configured as described above, depending on the external telephone, when the pulse P described on the previous page occurs, the exchange may malfunction, and
When switching to the telephone after dialing from FAX, there is a problem that the dial pulse is erroneously recognized as "1".

This invention was made in order to solve the above-mentioned problems, regardless of the type of external telephone used, without generating an abnormal pulse etc. on the telephone line when switching from the fax side to the telephone side,
It is an object of the present invention to obtain a facsimile machine that can be switched smoothly.

[Means for Solving the Problems] A facsimile apparatus according to the present invention is a switching means for selectively switching a facsimile apparatus or a telephone as its own device as a terminal apparatus connected to a two-wire telephone line, and a switching means for the switching means. A switching element that is closed for a predetermined time in conjunction with the switching operation, and a signal line connected in series with the switching element and connected to the two-wire telephone line of the switching means or between signal lines connected to a telephone. And a constant voltage element that suppresses the maximum voltage between the signal lines to a predetermined value or less.

[Operation] The facsimile apparatus according to the present invention has a switching means for selectively switching its own facsimile apparatus or telephone as a terminal apparatus connected to a two-wire telephone line, and interlocks with the switching operation of the switching means. A switching element that is closed for a predetermined time and a switching element connected in series with the switching element and inserted between signal lines to which a two-wire telephone line of the switching means is connected or between signal lines to which a telephone is connected; A constant voltage element for suppressing the maximum voltage between lines to a predetermined value or less, so that when a terminal device connected to a two-wire telephone line is switched to a facsimile device or a telephone, a signal of the two-wire telephone line is used. The maximum voltage induced between the lines is suppressed to a predetermined value or less.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, (1) is a CML relay, (2) is a DC closing circuit in a facsimile, (3) is an external telephone, (4) is a hook switch in the telephone, and (5) is a DC closing circuit in the telephone. , (6) a switch, (7) is a constant voltage element connected or disconnected by a relay (8) in parallel to the external telephone terminal T ₁ / T ₂ of the telephone line.

 Next, the operation will be described.

In FIG. 1, the CML relay (1) is tilted to the B side from the DC closing circuit (2) in the facsimile, and the relay (8) is tilted to the C side before switching to the external telephone (3), so that the constant voltage element ( varistor) to (7) previously connected in parallel to the T ₁ / T ₂ terminal, CML
When the relay (1) is tilted to the B side, the L ₁ and L ₂ voltages are clipped to the varistor (7) voltage V _B until the DC closing circuit of the external telephone (3) is fully operated (note that The varistor voltage is set slightly higher than the voltage at which the external telephone can operate), and the relay (8) is returned after the external telephone (3) has been sufficiently DC-closed. The control timing of the relay (8) and the CML relay is shifted to the relay (8) C side at point a in FIG. 1 (b). At the point b, the CML relay is set to the B side. T
After a lapse of time, the relay (8) is returned from the C side at the point c. By controlling the relay in this way, the line voltage becomes the varistor voltage
Going above V _B can be prevented.

In the above-described embodiment, the case where the FAX side is switched to the external TEL side is shown, but the constant voltage element (varistor)
By connecting (7) to L ₁ / L ₂ lines as shown in FIG. 2 (a), also, FAX side DC閉結(2) is also CML relay (1) is tilted toward the M In the case of the type that cannot close the DC immediately, when the telephone line is switched from the external telephone (3) to the fax side by the CML relay (1), an abnormal pulse as shown in FIG. 3 (b) is generated. . In order to prevent this, the relay (8), CML
The same effect is achieved by controlling the relay (1).

[Effect of the Invention] The facsimile apparatus according to the present invention is a switching device for selectively switching its own facsimile device or telephone as a terminal device connected to a two-wire telephone line, and is linked to a switching operation of the switching device. A switching element to be closed for a predetermined time and a switching element connected in series with the switching element and inserted between signal lines to which a two-wire telephone line of the switching means is connected or between signal lines to which a telephone is connected; A constant-voltage element for suppressing the maximum voltage between the signal lines to a predetermined value or less, so that when switching a terminal device connected to the two-wire telephone line to a facsimile device or a telephone, the two-wire telephone line is used. The maximum voltage induced between the signal lines is suppressed to a predetermined value or less. There is an effect that does not occur.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are a block diagram of an interface portion and a telephone line voltage waveform diagram of a facsimile apparatus using an external telephone according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b).
FIG. 3 is a block diagram and a waveform diagram showing another embodiment of the present invention, and FIGS. 3A and 3B are a block diagram and a waveform diagram showing a case of a conventional facsimile machine. In the figure,
(7) shows a constant voltage element, and (8) shows a relay. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Scope of request for utility model registration] 1. A switching means for selectively switching a facsimile apparatus or a telephone set as a terminal apparatus connected to a two-wire telephone line, and a predetermined time interlocked with a switching operation of the switching means. A switching element, connected in series with the switching element, and
A constant-voltage element inserted between signal lines to which a line-type telephone line is connected or between signal lines to which a telephone is connected, and which suppresses the maximum voltage between the signal lines to a predetermined value or less. Facsimile machine.