JPH0124716Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of an input switching circuit in a multi-point recorder that sequentially switches a large number of input signals and supplies them to the recorder.

Conventionally, a rotary switch driven in synchronization with a dotting mechanism or the like has often been used to switch input signals in a multi-point recorder. This type of input switching circuit has the advantage that it is relatively easy to synchronize input signal switching and recording operation, but it requires as many switching contacts as there are input signals in the rotary switch section, which reduces the number of input points. As the number of rotary switches increases, the structure of the rotary switch section becomes more complicated. In addition, the multi-point recorder has 2, 3, 6, 12, 24
Types with dots are generally put into practical use, but those with 6 and 12 dots are in the greatest demand.For this reason, input switching circuits for 6 to 12 dots are prepared as standard products.For example, in the case of 24 dots, uses a combination of two 12-point circuits. However, it is not easy to combine two rotary switches and drive them in synchronization, and the configuration of the drive system becomes complicated.

The present invention eliminates the drawbacks of the conventional device as described above, allows easy synchronization with the recording operation using a rotary switch, and switches a large number of input signals by combining a switching circuit for a small number of inputs. The purpose of this invention is to realize an input switching circuit for a multi-point recorder with a simple configuration.

The input switching circuit for a multi-point recorder of the present invention combines an input scanner using an electronic switch or relay with a rotary switch, and uses the rotary switch as a generator of an addressing signal for the input scanner. Using a switch, it is possible to switch between multiple inputs.

Hereinafter, the input switching circuit for a multi-point recorder according to the present invention will be explained using the drawings.

The figure is a block diagram showing an embodiment of the input switching circuit for a multi-point recorder according to the present invention, and illustrates a case where a 24-point input switching circuit is realized using a 12-point rotary switch. In the figure, both SW ₁ and SW ₂ are rotary switches having 12 selection contacts a ₁ to _{a 12} , DR is a drive system such as a gear train, and SW is a rotary switch connected to a dotting mechanism as well as a drive system DR.
Synchronous motor that drives SW ₁ and SW ₂ ,
SCA ₁ and SCA ₂ each receive 12 input signals S ₁ ~
The scanner and INV to which S ₁₂ , S ₁₃ to _{S 24} are applied are inverters. In addition, the scanners SCA ₁ and SCA ₂ are composed of electronic switches such as transistors or relays, and each receives an address designation signal S _ad that specifies the position of the input terminal to be selected, and
24 depending on the combination with the select signal Ss that selectively operates the two scanners SCA ₁ and SCA ₂ .
The input signals S ₁ to _{S 24} are sequentially selected and supplied to a recorder section (not shown). i.e. Sukiyana
An addressing signal S _ad that sequentially specifies 12 addresses is commonly applied to SCA ₁ and SCA ₂ , and input signals S ₁ to S ₁₂ and S ₁₃ to _{S 24} are selected sequentially, so the addressing signal S ad is applied to SCA 1 and SCA 2. Input signal S ₁ according to S _ad
If _the scanners SCA ₁ and SCA 2 are operated alternately by the select signal Ss every time ~S ₁₂ and S ₁₃ ~ _{S 24} are scanned once, 24 input signals S can be generated by the two scanners SCA ₁ and SCA ₂ . ₁ to _S24 can be sequentially supplied to the recorder section.

Now, the rotary switch SW ₁ which generates the above addressing signal S _ad and select signal Ss,
The operation of SW ₂ and its mechanical parts is explained as follows.

Rotary switch SW ₁ has all selection contacts a ₁
A constant voltage E is applied to ~ _a12 via the resistor R, and only the selected contact that has contacted the movable contact has zero potential, so each contact output and scanner SCA ₁ , SCA ₂
By associating the driving of the electronic switch or relay with the driving of the electronic switch or relay, it is possible to generate an addressing signal S _ad that sequentially drives the electronic switch or relay in accordance with the rotation of the movable contact. Further, half of the selection contacts _a1 to _a6 of the rotary switch _SW2 are connected in common, and a constant voltage E is applied to these selection contacts _a1 to _a6 via a resistor R.
Therefore, the contact output Ss obtained repeats on and off every half period of the rotation period of the movable contact, and by applying it to one scanner SCA ₂ via the inverter INV,
The select signal Ss can be used to alternately operate the scanners SCA ₁ and SCA ₂ .

Here, the rotary switches SW ₁ and SW ₂ are driven synchronously by a synchronous motor SM and a drive system DR, and the drive system DR controls the movable contacts of the rotary switches SW ₁ and SW ₂ at a constant rotation ratio. For example, the rotation ratio is selected so that the movable contact of rotary switch SW ₂ rotates by 1/2 while the movable contact of rotary switch SW ₁ rotates once. In this way, the addressing signal S _ad performs one scan for each on/off half cycle of the select signal Ss, so the scanners SCA ₁ and SCA ₂
repeats the selection operation alternately, and the recorder part has 24
The point input signals S ₁ to _{S 24} can be sequentially switched and supplied.

As mentioned above, when the addressing signal S _ad of _the scanners SCA ₁ and SCA ₂ is generated by the rotary switch SW ₁ , the input signal is It is easy to synchronize the switching and recording operation, and the structure is simple because rotary switch SW ₁ only needs to generate a contact output instead of intermittent signal as in the conventional case. . In addition, if you want to use rotary switch SW ₁ and scanner SCA ₁ for 12 points as a reference unit, and expand this to 24 points, add scanner SCA ₂ for 12 points and change the operating order of these scanners. Since it is controlled by another rotary switch _SW2 , the address designation signal
There is no need to make any changes to the rotary switch _SW1 that generates S _ad , and the number of input points can be easily changed.

In addition, in the above explanation, the rotary switch
Although SW ₁ and SW ₂ are exemplified as switches having only selection contacts a ₁ to a ₁₂ , they are not limited to such switches. A similar operation can be achieved by using a rotary switch having an auxiliary contact for locking the motor of the servo mechanism on the top.

As explained above, in the input switching circuit for a multi-point recorder of the present invention, an input scanner using an electronic switch or relay is combined with a rotary switch, and the rotary switch is used as a generator of an addressing signal for the input scanner. Therefore, an input switching circuit for a multi-point recorder that can switch between multiple inputs using a rotary switch for a small number of inputs can be realized with a simple configuration.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of the input switching circuit for a multi-point recorder according to the present invention. SW ₁ , SW ₂ ...Rotary switch, DR...Drive system, SM...Synchronous motor, SCA ₁ ,
SCA ₂ ...Sukiyana, INV...Inverter.

Claims (1)

[Scope of utility model registration request] first and second input signals that sequentially select one input signal from among the plurality of input signals in accordance with each applied addressing signal and supply the input signals to the recorder section;
scanner, and a first scanner having a number of selection contacts equal to the number of input points of the first and second scanners, and generating a contact output according to the movement of the movable contact as an addressing signal for the first and second scanners. The rotary switch has a number of selection contacts equal to that of the first rotary switch, and generates a contact output that changes every half rotation with respect to the movement of the movable contact, and this contact output is applied to the first and second rotary switches. The first signal is used directly or via an inverter as a select signal to operate the scanner alternately.
The movable contacts of the first and second rotary switches are connected to the first rotary switch by using the power of a second rotary switch that is applied to a second scanner and a synchronous motor that is made up of a gear train and drives a dotting mechanism, etc. An input switching device for a multi-point recorder, comprising a drive system that rotates at a ratio such that the movable contact of a second rotary switch rotates by 1/2 while the movable contact of a second rotary switch rotates once. circuit.