JP3367766B2 - Automatic temperature recorder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pen type recorder for recording the temperature of refrigerating units for containers and the like.

[0002]

2. Description of the Related Art A conventional pen type recorder for recording an electronic temperature will be described with reference to FIGS.

In FIG. 5, the temperature of the intake air sucked into the refrigeration unit, that is, the detected value of the temperature sensor 1 for detecting the temperature inside the container is converted into a digital signal by the A / D converter 2, and the central operation is performed via the interface 3. After entering the device 4 and being subjected to predetermined arithmetic processing here, it is output to the servo motor 6 via the interface 5
Drives the recording pen 7 via a large number of gears.

The position of the recording pen 7 is detected by the potentiometer 8 and is input as a feedback signal to the central processing unit 4 via the A / D converter 2 and the interface 3. In the central processing unit 4, a signal is output to the servo motor 6 so that the deviation between the temperature inside the container input from the sensor 1 and the position of the recording pen 7 input from the potentiometer 8 is always zero, and the servo motor 6 is stopped. The position, that is, the position of the recording pen 7 indicates the temperature inside the container, and the recording pen 7 records the temperature inside the container on the recording paper.

In FIGS. 6 and 7, the servomotor 6 and the potentiometer 8 are attached to a fixed plate 9, and a motor pinion 10 is fitted and fixed to a shaft 61 of the servomotor 6.

A gear 13 and a pinion 14 are attached to a rotary shaft 81 of the potentiometer 8. The gear 13 includes a pinion 10 of the servomotor 6 and a gear 11 and a pinion 12
Are engaged through. A fan-shaped gear 15 having a recording pen 7 is engaged with the pinion 14 of the potentiometer 8.

In the figure, X is the center of rotation of the fan-shaped gear 15, and 16
Is a pen base for supporting the recording pen 7, and 17 and 18 are stoppers.

In the above, when the servo motor 6 rotates,
The pinion 10, the gear 11, the pinion 12, the gear 13, the pinion 14 and the fan gear 15 are sequentially driven, and the recording pen 7 moves. Then, the temperature inside the container is recorded on the recording paper. The potentiometer 8 also rotates when the gear 13 rotates and feeds back the position of the recording pen 7.

[0009]

In the above-mentioned conventional automatic temperature recorder, the temperature display value in the container recorded therein is a digital display value of the temperature in the container of the electronic controller mounted on the refrigeration unit or When the value does not match the value of another temperature indicator, the field serviceman forcibly moves the recording pen 7 of the recorder (including deformation) as an easy adjustment method (without performing the regular adjustment method). By doing so, the display value recorded on the recorder will be adjusted to the digital display value of the electronic controller or the value of another temperature indicator. As described above, when the recording pen 7 is forcibly moved against the movement of the servo motor, the recording pen may be deformed or the teeth of various pinions (in the case of plastic) of the recording pen drive mechanism may be chipped. there were.

[0010]

The present invention takes the following means in order to solve the above problems.

As a first means, the temperature inside the container is recorded.
A servo motor for driving the recording pen, port to detect the position of the recording pen is Rica moving by the said servo motor
In an automatic temperature recorder equipped with a tensioner ,
The potentiometer detects the position of the recording pen.
It is an axis for
The rotating pinion is fixed and the pinion
The interlocking brim has a shaft that is fixed.
It is capable of abutting against the fitted on the relative rotatable and the flange portion to the shaft, and ho <br/> Iru driven by the operation of the servo motor, so that not transmitted predetermined frictional force or rotational force
And a spring member for pressing the wheel against the collar portion. As a second means, the above first means
The spring member includes the pinion and the wheel.
And the pinion has a predetermined frictional force.
Push the spring member in the axial direction until the value reaches
It was fixed to the spindle.

[0012]

In the above-mentioned first means, it is usually driven by the operation of the servomotor through the gear train. Then, one wheel of the shaft rotates without slipping on the collar member, and the collar member is driven. When the collar member rotates, the rotational force of the servo motor is transmitted to the recording pen.

On the other hand, when the recording pen is forcibly moved by an operator or the like, the rotational force is transmitted in the opposite direction to the above. Then one wheel of the shaft slides on the collar member. In this way, the problem that the recording pen is deformed and the teeth of the gear train of each part are missing is solved. Also, the second hand
In the tier, as described above, turn the potentiometer with the wheel.
The spring member provided on the shaft of the meter is a pinion and ho
It is pinched between the wheels and pushed by the pinion
Since it creates a frictional force against the wheel,
This friction force is set to a predetermined value, that is, in the normal case, potentiometer
Can be driven without sliding the data and recording pen, and the recording pen is forced
Set it to a value that will allow it to slip when moved.
Force that exceeds the frictional force applied to the recording pen by the operator.
The wheel slides on the brim and records
If the pen is deformed or the teeth of the gear train in each part are missing,
The problem is solved.

[0014]

【Example】

(1) The first embodiment of the present invention will be described with reference to FIGS.

The parts explained in the conventional example are given the same numbers and their explanations are omitted, and the parts relating to the present invention will be mainly explained.

In FIGS. 1 and 2, a plurality of shafts 81, 21, 6
One of them, for example, a disk-shaped collar 19 is fixed coaxially to the shaft 81 of the potentiometer 8. A liner 20 is mounted on the collar 19 to increase friction. The collar 19 with the liner 20 is the collar portion.

A wheel (gear) 13a is fitted on the shaft 81 so as to be capable of contacting the flange portion and relatively rotatable. Also gear 13
a is engaged with the pinion 12. A pinion 14a is fixed to the shaft 81 via a disc spring 21 on the gear 13a so that the pinion 14a can be pushed axially. That is, they are screwed and fixed. At this time, the gear 13a is pushed by the liner 20 by the spring action of the disc spring 21, and the pinion 14a is screwed in until the frictional force with the liner 20 reaches a predetermined value (see FIG. 3). Reference numeral 22 in the drawing denotes a fixing screw of the pinion 14a. Pinion 14a
Is engaged with the fan-shaped gear 15.

In the above, the gear 13a is normally driven by the operation of the servomotor 6 through the pinions and gears arranged on a plurality of shafts. Then, the gear 13a rotates without sliding on the liner 20 and the collar 19 is driven.
When the collar 19 rotates, the fan-shaped gear 1 is passed through the pinion 14a.
5 is driven and the recording pen 7 moves.

On the other hand, when the recording pen 7 is forcibly moved by an operator or the like, the rotational force is transmitted in the opposite direction to the above.
Then, the gear 13a slides on the liner 20, so that no rotational force exceeding a predetermined frictional force is transmitted to the gear 13a.

Therefore, in the normal case, a predetermined friction force can be driven without sliding the potentiometer 8 and the recording pen 7, and when the recording pen 7 is forcibly moved,
Set the pinion 14a, 12 and 10 within a range that will not be damaged. Then, the problem that the recording pen 7 part is deformed and the teeth of the pinion or the like of each part is missing is solved.

(2) A second embodiment of the present invention is shown in FIG. In this example, a coil spring is used instead of the disc spring 21 of the first embodiment.
21a is provided. Since the operation and effect are almost the same, the description is omitted.

In both the first and second embodiments, the pinion 14a attached to the shaft 81 of the potentiometer 8 is made idle, but the motor pinion 10 and the pinion 12 may be made idle.

Since the shaft 81 of the potentiometer 8 rotates even if the pinion 14a idles as described above, the position corresponding to the movement of the recording pen 7 is input to the potentiometer 8. Therefore, when the electronic recorder is energized, it operates so that the deviation between the current position of the recording pen 7 and the input value of the temperature sensor is set to 0, and correct recording is performed.

[0024]

As described above, according to the present invention,
Even if an unreasonable force is applied to the recording pen by an operator or the like, the problem that the recording pen is deformed or the pinion is missing is solved.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is a view from A of FIG. 1 of the same embodiment.

FIG. 3 is a BB view of FIG. 2 of the embodiment.

FIG. 4 is a sectional view of a shaft portion of a second embodiment of the present invention.

FIG. 5 is an overall configuration system diagram of a conventional example.

FIG. 6 is a front view of a recording pen unit of the conventional example.

FIG. 7 is a C view of FIG. 6 of the conventional example.

[Explanation of symbols]

1 Temperature sensor 6 Servo motor 7 Recording pen 8 Potentiometer 13,13a wheels 14 pinion 17,18 Stopper pin 20 liner members 21 Disc spring 21a Cylindrical coil spring 81 axes

Claims (2)

(57) [Claims] 1. A recording pen for recording the temperature in a container is driven.
A servomotor for moving a potentiometer for detecting the position of the recording pen is Rica moving by the said servo motor
When, in an automatic temperature recorder equipped with, the potentiometer
The meter is an axis for detecting the position of the recording pen.
The pinion that rotates with the movement of the recording pen
The collar part that is fixed and works with the pinion.
There have fixed axis, the axis is the axis relative rotatable and fitted contactable to the flange portion, and a wheel driven by the operation of the servo motor, a predetermined
An automatic temperature recorder, comprising: a spring member for pressing the wheel against the flange so that a rotational force greater than a frictional force is not transmitted . 2. The spring member includes the pinion and the hosel.
The pinion is clamped between the wheel and
Push the spring member in the axial direction until
2. The device according to claim 1, wherein the shaft is fixed to the shaft.
On-board automatic temperature recorder.