JP2816676B2 - Line switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a line switching device for switching and connecting a facsimile apparatus to any one of a plurality of lines. (Prior Art) This type of line switching apparatus is used in a mode as shown in FIG. The line switching device 1 in FIG.
The facsimile device 2 is connected to the subscriber line 3 and the dedicated line 4 while being connected to the facsimile device 2, and switches and connects the facsimile device 2 to one of the subscriber line 3 and the dedicated line 4. A conventional line switching apparatus 1 is configured as shown in FIG. 3, and includes a switching circuit 10 for switching and connecting a facsimile apparatus 2 to one of a subscriber line 3 and a dedicated line 4, and a switching circuit 10 It comprises a control circuit 20 for switching to either the line side or the dedicated line side. In the switching circuit 10, upon receiving an incoming call, the subscriber line 3 is connected to the relay contact K101a → DC loop detector 102 → relay contact K103a → K
The facsimile apparatus 2 is connected to the facsimile apparatus 2 via the path 104a → K105a, or the dedicated line 4 is connected to the facsimile apparatus 2 via the relay contact K107a → DC loop detector 108 → relay contact K103a → K104a → K105a. As a result, a call signal from the subscriber line 3 or the dedicated line 4 is transmitted to the facsimile apparatus 2. Next, when calling, the HOOK of the telephone 110 for the subscriber line
・ Detection of HOOK ・ OFF by hook-off detection circuit 111 → Relay contact K101b → K103b → Facsimile device 2 → Relay contact K105a → K104a → K103a → DC loop detection circuit 102 → Subscriber line via relay contact K101a 3
HOOK ・ O of telephone 114 for exclusive use
FF is detected by the hook-off detection circuit as HOOK / OFF, 115 → relay contact K107b → K103b → facsimile device 2 → relay contact K105a → K104a → K103a → DC loop detection circuit 108 → relay contact K107a to dedicated line 4 Connecting. Thus, a call can be transmitted from the telephone 110 for the subscriber line or the telephone 114 for the dedicated line via the facsimile apparatus 2. Further, at the time of facsimile communication, the subscriber line 3 is connected to the relay contact K101a → the DC loop detection circuit 102 → the relay contact K1.
03a → K104a → Signal level adjuster 120 → Connect to facsimile machine 2 via the route of relay contact K105a or dedicated line relay contact K107a → DC loop detection circuit 108 → Relay contact K103a → K104a → Signal level adjuster 120 → Relay Contact K10
The facsimile machine 2 is connected via the route 5a. As a result, a facsimile communication signal is transmitted and received between the subscriber line 3 or the dedicated line 4 and the facsimile apparatus 2. At this time, the signal level adjusting unit 120 converts the facsimile communication signal from the facsimile apparatus 2 into a DC loop detection circuit 121 → transformer 1
22 → Hybrid circuit 123 → Attenuator 124 → Amplifier 12
5 → Hybrid circuit 126 → Transformer 127 → Relay contact K12
In addition to transmitting and transmitting the facsimile communication signal from the subscriber line 3 or the dedicated line 4, the relay contact K128a → the transformer 127 → the hybrid circuit 126 → the amplifier 1
29 → Attenuator 130 → Hybrid circuit 123 → Transformer
122 → transmit and transmit on the path of the DC loop detection circuit 121. On the other hand, the control circuit 20 includes an input / output circuit 204 for inputting / outputting signals from / to each circuit in the main unit, a central processing unit (hereinafter, referred to as a CPU 205) for controlling the main unit, and a read-only unit storing a control program. Memory (hereinafter referred to as ROM) 2
06 and a random access memory (hereinafter referred to as RAM) 207 for temporarily storing a dial number from the facsimile machine 2. Further, a subscriber line 3 and a dedicated line 4
Incoming circuits 201 and 202 for detecting an incoming call from each other and relays K101, K103 and K1 for performing line switching in a switching circuit.
04, K105, K107, K128, and K131, and a relay driver 203 for driving these relays. Each relay K101,
K103 and K107 are linked relay contacts K101a, K101b,
The linked relay contacts K103a and K103b and the linked relay contacts K107a and K107b are respectively switched. When a call is made from the facsimile apparatus 2, a dial signal indicating the telephone number of the called side is transmitted from the facsimile apparatus 2, and the relay contact K105a → the DC loop detection section 121 →
MF receiver on the path from transformer 122 to hybrid circuit 123
Transmitted to 135. When the MF receiver 135 outputs the dial signal, the MF receiver 135 notifies the CPU 205 of the telephone number of the called side via the input / output circuit 204. CPU 205 stores the called party's telephone number in RAM2
07 and store it in the MF
Drive the dialer 136 or DP generator 137. here,
When the MF dialer 136 is driven, a push button signal indicating the telephone number is transmitted from the MF dialer 136, and the push button signal is transmitted from the amplifier 138 to the changeover switch 139.
→ Transformer 140 → Transmission via relay contact K131a path, and further transmitted to subscriber line 3 side or dedicated line 4 side. When the DP generator 137 is driven, a dial pulse signal indicating the telephone number is transmitted from the DP generator 137, and the dial pulse signal is transmitted through a relay contact K128a → K104a → K103a path. It is sent to the 3 side or the dedicated line 4 side. In this way, a call can be made from the facsimile apparatus 2 to the subscriber line 3 or the dedicated line 4. By the way, in the above configuration, the manual call to the subscriber line 3 by the facsimile apparatus 2 is performed by connecting the telephone 110 for the subscriber line to the subscriber line 3 via the facsimile apparatus 2 and manually operating the facsimile apparatus 2 to the dedicated line 4. The outgoing call is made by connecting the telephone 114 for the dedicated line to the dedicated line 4 via the facsimile device 2. Also, while the facsimile apparatus 2 is communicating with the subscriber line 3, a call for a call to the dedicated line 4 or an incoming call from the dedicated line 4 is performed using the telephone 114 for the dedicated line, and the facsimile apparatus 2 During communication with the dedicated line 4, a call for a call to the subscriber line 3 or an incoming call from the subscriber line 3 is performed using the telephone 110 for the subscriber line. That is, in the conventional line switching device, the facsimile device 2 manually calls the subscriber line 3 or the dedicated line 4 and the facsimile device 2 communicates with the subscriber line 3 or the dedicated line 4 while using a vacant line. In this case, two telephones, a telephone 110 for a subscriber line and a telephone 114 for a dedicated line, are required to respond to the outgoing or incoming call. (Problems to be Solved by the Invention) As described above, in a conventional line switching device, two telephones, a telephone for a subscriber line and a telephone for a dedicated line, are provided, and the device is complicated and There was a problem that it became expensive. SUMMARY OF THE INVENTION It is an object of the present invention to provide a line switching apparatus which enables a facsimile apparatus to call a plurality of lines and make a call to a vacant line using a single telephone. [Effects of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention relates to a line switching device for switching and connecting a facsimile apparatus to a plurality of lines. First switching connection means for switching and connecting the telephone to one of the plurality of lines via the facsimile device for manual calling of the used facsimile device, and the facsimile device being connected to one of the plurality of lines. Second switching connection means for switching and connecting the telephone to the vacant line so that the telephone communicates with the vacant line during a call. (Operation) According to the present invention, when a facsimile apparatus is manually called by using a telephone, the telephone is switched to one of a plurality of lines via the facsimile apparatus by the first switching connection means. As a result, it becomes possible to manually call the facsimile apparatus using one telephone. Further, when the facsimile apparatus talks with an idle line while talking on any of the plurality of lines, the telephone is switched to the idle line by the second switching connection means. As a result, even when only one telephone is provided, the facsimile apparatus can talk with an empty line while talking with any of a plurality of lines. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of a line switching apparatus according to the present invention. In this embodiment, each of the linked relay contacts K101a and K101b and each of the linked relay contacts K103a in the conventional apparatus shown in FIG. , K103b, each linked relay contact K
Instead of 107a, KK107b, each relay contact K31a, K32a, K33a, K3
4a, K35a, and K36a are provided. Also, a relay contact K37a is inserted between the relay contact 32a and the relay contact K34a, and a relay contact K3 is inserted between the dedicated line 4 and the relay contact K35a.
8a is inserted. Furthermore, each relay K31a-K38 for switching each relay contact K31a-K38a is provided. A selection switch 40 for selecting either the subscriber line 3 or the dedicated line 4 is provided. However, the telephone 114 for the dedicated line is not provided. Note that, in FIG. 1, the same reference numerals are given to portions having the same operation as the conventional device in FIG. 3 for convenience of explanation. Now, when making a call from the telephone 110 to the subscriber line 3 via the facsimile machine 2, the telephone 110 is set to an off-hook state. At this time, the hook-off detection circuit 111
Detects an off-hook of the telephone 110 and notifies the central processing unit (hereinafter referred to as CPU) 205 of the fact via the input / output circuit 204. The CPU 205 responds to the off-hook of the telephone 110,
Each relay to switch each relay contact K31a, K32a, K105a
Turn on K31, K32, and K105. As a result, the telephone 110 is connected to the subscriber line 3 via the path of the hook-off detection circuit 111, relay contact K32a → K37 → K34a → facsimile device 2 → relay contact K105a → K104a → K33a → DC loop detector 102 → relay contact K31a.
Connected to. Thus, it is possible to make a call from the telephone 110 to the subscriber line 3 via the facsimile machine 2. When making a call from the telephone 110 to the dedicated line 4 via the facsimile apparatus 2, the telephone 110 is turned off-hook and the selection switch 40 is turned on to select the dedicated line 4. At this time, the off-hook of the telephone 110 is notified from the hook-off detection circuit 111 to the CPU 205, and the ON of the selection switch 40 is notified to the CPU 205. The CPU 205 responds to the off-hook of the telephone 110 and the turning-on of the selection switch 40, and the relay contacts K105a, K35a, K33a,
Turn on each relay K105, K35, K33, and K32 to switch K32a. As a result, the telephone 110 sets the hook-off detection circuit 111 →
Relay contact 32a → K37a → K34a → Facsimile device 2 → Relay contact K105a → K104a → K33a → DC loop detector 108 →
The relay contact K35a is connected to the dedicated line 4 through the path K38a. As a result, a call can be made from the telephone 110 to the dedicated line 4 via the facsimile machine 2. Next, when the dedicated line 4 is connected to the facsimile machine 2 and the dedicated line 4 is used for facsimile communication, the telephone
The telephone 110 is connected to the subscriber line 3 through a hook-off detection circuit 111 → relay contact K32a → K31a.
Can make and receive calls to and from the subscriber line 3. Further, when the subscriber line 3 is connected to the facsimile apparatus 2 and the subscriber line 3 is used for facsimile communication, the telephone 110 is set to an off-hook state to make a call from the telephone 110 to the leased line 4. At the same time, the selection switch 40 is turned on to select the dedicated line 4. At this time, the off-hook of the telephone 110 is notified to the CPU 205 from the hook-off detection circuit 111, and the ON of the selection switch 40 is also notified to the CPU 205. Here, the CPU 205 determines that the subscriber line 3 is used for facsimile communication based on the detection output of the DC loop detector 102, and therefore, based on the off-hook of the telephone 110 and the on of the selection switch 40. It is determined that telephone 119 is directly connected to the dedicated line. Then, the CPU 205 controls the relay contacts K32a, K37a,
Turn on each relay K32, K37, K38 to switch K38a. As a result, the telephone 110 is connected to the dedicated line 4 through the route of the hook-off detection circuit 111 → the relay contact K32a → K37a → K38a, and can make a call from the telephone 110 to the dedicated line 4. Further, when the subscriber line 3 is connected to the facsimile apparatus 2 and the subscriber line 3 is used for facsimile communication, if there is an incoming call from the dedicated line 4, the incoming call is detected by the incoming call detection circuit 202, and the incoming call is detected. From detection circuit 202 to dedicated line
Is notified to the CPU 205. The CPU 205 determines that the subscriber line 3 is being used for facsimile communication based on the detection output of the DC loop detector 102. Judge to connect directly to. Then, the CPU 205 switches each of the relay contacts K32a, K37a, and K38a to switch the respective relay contacts K32, K37a, and K38a.
Turn on K37 and K38. As a result, the telephone 110 is connected to the dedicated line 4 via the hook-off detection circuit 111 → relay contact K32a → K37a → K38a, and the telephone 110 can receive an incoming call from the dedicated line 4. As described above, in this embodiment, it is possible to make a manual call to the subscriber line 3 or the dedicated line 4 of the facsimile apparatus 2 only by providing one telephone 110, and furthermore, to provide one telephone
By simply providing 110, the facsimile machine 2
Alternatively, it is possible to cope with an outgoing call or an incoming call for a call using an empty line while communicating with the dedicated line 4. (Effect of the Invention) As described above, according to the present invention, in a line switching apparatus for switching and connecting a facsimile apparatus to a plurality of lines, one line telephone and a manual call of the facsimile apparatus using the telephone are used. First switching connection means for switching and connecting the telephone to any one of the plurality of lines via the facsimile apparatus, and the telephone being vacant when the facsimile apparatus is talking with any of the plurality of lines. Second switching connection means for connecting the telephone to the vacant line for making a call is provided. 1) Manual call to a plurality of lines of the facsimile apparatus only by providing one telephone. 2) A facsimile machine can communicate with any one of a plurality of lines by using an empty line when only one telephone is installed. 3) Since only one telephone is required, it is possible to provide a simple and inexpensive device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an embodiment of a line switching device according to the present invention, FIG. 2 is a configuration diagram of a facsimile communication terminal using the line switching device, and FIG. FIG. 3 is a circuit diagram illustrating a line switching device. 1 ... line switching device, 2 ... facsimile device, 3 ...
... subscriber line, 4 ... dedicated line, 10 ... switching circuit, 20
... Control circuits, K31a to K38a, K104a, K105a, K131a ... Relay contacts, 40 ... Selection switches, 102,108 ... DC loop detectors, 111,115 ... Hook-off detection circuits, 120 ... Signal level adjusters, 201,202 ... ... incoming call detection circuit, 203 ... relay driver, 204 ... input / output circuit, 205 ... central processing unit, 206 ... read-only memory, 207 ... random access memory.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04M 11/00 H04N 1/00

Claims (1)

(57) [Claims] In a line switching apparatus for switching and connecting a facsimile apparatus to a plurality of lines, one of a plurality of lines is connected to the telephone via the facsimile apparatus for manually calling the facsimile apparatus using the telephone. First switching connection means for switching connection between the telephone and the facsimile apparatus, and when the facsimile apparatus is communicating with any one of the plurality of lines, the telephone is switched and connected to the empty line so that the telephone can talk with an empty line. A line switching device, comprising: a second switching connection means.