JPH0228889Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to the recording paper conveyance mechanism of an electrocardiograph. Specifically, it is an electrocardiograph that uses the so-called linear writing method in which the pen tip moves in a direction perpendicular to the direction of movement of the recording paper. This relates to the recording paper conveyance mechanism of the meter.

A conventional recording paper transport mechanism of this type is shown in FIG. 1, and a cross-sectional view taken along the line X-X' is shown in FIG. 2 to explain the main parts thereof. The example shown in FIG. 1 has three pens (three-channel system). Let the codes of each pen be 1 ₁ , 1 ₂ , and 1 ₃ . These are provided on the substrate 2. During recording, the pen tips 3 ₁ , 3 ₂ , 3 ₃ contact the surface of the contact portion of the recording paper 5 that is brought into contact with the pen roller 4,
They each move within a predetermined range in the same direction as the axial direction of the pen roller 4. This so-called straight line writing method is realized by a special mechanism and electrical control.
It is assumed that the pens 1 ₁ , 1 ₂ , and 1 ₃ are thermal pens, and the recording paper 5 is thermal paper. The pen roller 4 is rotatably attached to one end of the magazine 6 via a pen roller shaft 4a. Furthermore, magazine 6
As shown in FIG. 2, there is a pressure roller 7 inside the
It is provided so as to come into contact with a drive roller 9 via a slit 8 provided in the magazine 6. The drive roller shaft 9a is rotated by a drive section (not shown). The magazine 6 is attachable to and detachable from the main body 10 of the electrocardiograph (indicated by a chain line), or can be opened and closed.

In such a conventional recording paper transport mechanism of an electrocardiograph, the recording paper 5 is fed from a paper feeder (not shown).
The paper contacts a part of the outer peripheral surface of the pen roller 4, is held between the drive roller 9 and the pressure roller 7, and is conveyed by rotation of these rollers.

However, in such a recording paper transport mechanism, the line segment (waveform, character, etc.) immediately after being drawn on the recording paper 5 by the pen tips 3 ₁ , 3 ₂ , 3 ₃ is transferred to the drive roller 9 (and The disadvantage is that it is difficult to see because it is obstructed by the presence of the roller shaft 9a). Furthermore, in the conventional recording paper conveyance mechanism, the pen roller 4 carries the recording paper 5.
(due to the frictional force generated between the recording paper 5 and the recording paper), the frictional force produced between the drive roller 9 that moves the recording paper 5 and the pressure roller 7 must be increased. It was impossible. Therefore, it is necessary to increase the area of the outer peripheral surface of the drive roller 9 or the pressure roller 7, so the drive roller 9 or the pressure roller 7 itself becomes large, and when cutting the recording paper 5 after recording, the recording paper 5 , nib 3 ₁ ,
There is a waste in having to move the length from 3 ₂ and 3 ₃ to the passing point of the drive roller 9 or the pressure roller 7 without recording.

The present invention was devised to eliminate such inconveniences, and its purpose is to be able to see the line immediately after it is drawn on the recording paper by the pen tip, and to
It is an object of the present invention to provide a recording paper transport mechanism for an electrocardiograph that can effectively use recording paper.

Therefore, in the present invention, a pen roller that supports the pen tip via the recording paper is provided, and the pen roller is pressed on the downstream side of the recording paper conveyance path from the position where the pen tip is supported on the outer circumferential surface of the pen roller. The above object is achieved by providing a plurality of pressure rollers spaced apart from each other and a drive means for rotating at least one of the pen roller and the pressure roller.

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

FIG. 3 is a perspective view showing an embodiment of the present invention, and FIG. 4 is a sectional view of the main part in the Y-Y' direction shown in FIG. Among the components shown in FIGS. 3 and 4, those that are the same as those shown in FIGS. 1 and 2 are given the same numbers, and their explanations will be omitted.

In this embodiment, the pen roller 4 provided in the magazine 6 is similar to that shown in FIGS. There is no need for a slit to make contact with. The pen roller shaft 4a is supported at both ends of the magazine 6, one end of which protrudes from the magazine 6, and a drive gear 11 is attached thereto. Intermediate between pens 1 ₁ and 1 ₂ on board 2,
A pressure roller 12 is installed at the tip between the pins 1 ₂ and 1 ₃ .
Pressure roller supports 13 ₁ and 13 ₂ are attached so that the rollers ₁ and 12 ₂ can rotate freely. The pressure roller support parts 13 ₁ and 13 ₂ are the base part 14
₁ , 14 ₂ and the axis 1 for this base 14 ₁ , 14 ₂
Arm 16 rotatable via 5 ₁ and 15 _2
1 , 16 ₂ and arms 16 ₁ , 16 ₂ to the pen roller 4
It consists of a spring (provided in the arms 16 ₁ , 16 ₂ ) that presses it to the side.

In the recording paper conveyance mechanism of this embodiment configured as described above, when rotational force is transmitted from the drive section (not shown) provided in the main body 10 to the drive gear 11, the paper feed section (not shown) is transmitted to the drive gear 11. ) comes into contact with the pen roller 4, and the pen tips 3 ₁ , 3 ₂ ,
A line is drawn by 3 ₃ and pressure rollers 12 ₁ , 12
₂ , it moves under pressure.

As described above, according to this embodiment, the pressure roller 12
₁ and 12 ₂ respectively apply pressure to two places in the middle of the pen roller 4, but these are in positions where they do not press the lines drawn by the pen tips 3 ₁ , 3 ₂ , and 3 ₃ on the recording paper, so the lines shown in FIG. As shown, the waveforms (or characters) immediately drawn by the pen tips 3 ₁ , 3 ₂ , and 3 ₃ can be viewed without being obstructed.

As shown in FIGS. 3 and 4, the pressure rollers 12 ₁ and 12 ₂ are located on the outer circumferential surface of the pen roller 4 at positions that support the pen nibs 3 ₁ , 3 ₂ , and 3 ₃ in the recording paper conveyance path. The pen roller 4 is pressed on the downstream side. Therefore, the operation of the pen nibs 3 ₁ , 3 ₂ , 3 ₃ at any location on the recording paper 5 is not hindered by the pressure rollers 12 ₁ , 12 ₂ . Therefore, since a waveform can be drawn anywhere on the recording paper 5, the recording paper 5 can be used effectively.

FIG. 6 is a perspective view showing another embodiment of the present invention, and FIG. 7 is a sectional view of the main part in the Z-Z' direction shown in FIG. 6. In the examples shown in these figures, the same components as those shown in FIG. 1 are given the same numbers, and their explanations will be omitted. In this embodiment, the pen roller shaft 4 is similar to that shown in FIG.
A driving gear 11 is attached to one end of a, and this driving gear 11 is rotated by a driving part (not shown) provided in the main body 10. In this embodiment, the outer peripheral surfaces of the pressure rollers 20 ₁ and 20 ₂ are provided so as to come into contact with both ends of the pen roller 4 . Pressure roller 20 ₁ ,
20 ₂ is pressurized by a pressure means (not shown) via the respective rotating shafts 21 ₁ and 21 ₂ , and its outer peripheral surface is pressed toward the pen roller 4 side. The rotating shafts 21 ₁ and 21 ₂ are each supported within the main body 10 and are rotatable.

In this embodiment configured in this way, the recording paper 5 is pressed against both ends of the pen roller 4, and in this state, the pen roller shaft 4a is rotated by a drive unit (not shown) via the drive gear 11, thereby causing the pen roller 4 and The pressure rollers 20 ₁ and 20 ₂ are rotated and conveyed. In this case, the pen nibs 3 ₁ , 3 ₂ , 3 ₃
The waveforms or characters drawn by can be seen immediately after they are drawn because there is nothing blocking them.

In this embodiment as well, as shown in FIGS. 6 and 7, the pressure rollers 20 ₁ and 20 ₂ are located on the outer peripheral surface of the pen roller 4 from the positions that support the pen nibs 3 ₁ , 3 ₂ , and 3 ₃ . The pen roller 4 is also pressed on the downstream side of the recording paper conveyance path. Therefore, the pen tip 3 ₁ ,
The operations of 3 ₂ and 3 ₃ are not hindered by the pressure rollers 12 ₁ and 12 ₂ at any location on the recording paper 5. In particular, the pen tips 3 ₁ and 3 ₃ are on the recording paper 5.
can be moved to the periphery of the In this way, the waveform can be drawn anywhere on the recording paper 5, so the recording paper 5 can be used effectively.

Incidentally, in both of the above two embodiments, the pen roller is driven, but the pressure roller may be driven and the pen roller may follow it and rotate, or these two rollers may be driven. may be driven simultaneously.

As explained above, according to the present invention, the plurality of pressure rollers are provided on the outer peripheral surface of the pen roller at a position that presses the pen roller downstream of the position where the pen tip is supported, on the downstream side of the recording paper conveyance path. Therefore, the pressure roller does not interfere with the operation of the pen tip. Therefore, the recording paper is used effectively. Further, since the pressure rollers are provided with a gap between them, the line segment immediately after being recorded on the recording paper can be seen from between the pressure rollers. Therefore, an electrocardiograph using such a mechanism is very convenient because the patient's condition can be immediately grasped and treatment can be performed as needed.

Further, according to the present invention, since the recording paper is held and conveyed by the pen roller and the pressure roller that applies pressure to the pen roller, the recording paper is securely in close contact with the pen roller, and even if the pressure roller is small, It has the advantage of being good. Therefore, when cutting and taking out the recording paper after recording, it is only necessary to move the recording paper slightly, so that the recording paper can be used effectively and is economical. Further, according to the present invention, since the pressure roller can be made smaller as described above, the recording paper transport mechanism can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a recording paper transport mechanism of a conventional electrocardiograph, FIG. 2 is a sectional view of its main parts, and FIG. 3 is a perspective view of a recording paper transport mechanism of an electrocardiograph according to an embodiment of the present invention. FIG. 4 is a sectional view of the main part thereof, FIG. 5 is a plan view of the main part of the recording paper conveyance mechanism shown in FIG. 3, and FIG. 6 is a record paper conveyance mechanism of an electrocardiograph according to another embodiment of the present invention. FIG. 7 is a sectional view of a main part thereof. 1 ₁ , 1 ₂ , 1 ₃ ... pen, 3 ₁ , 3 ₂ , 3 ₃ ... pen tip, 4 ... pen roller, 12 ₁ , 12 ₂ , 20 ₁ ,
20 ₂ ... Pressure roller, 5 ... Recording paper, 11 ...
driving gear.

Claims (1)

[Claims for Utility Model Registration] In a recording paper conveyance mechanism of an electrocardiograph in which a pen tip moves at right angles to the moving direction of recording paper, a pen roller that supports the pen tip via the recording paper, and this pen roller. a plurality of pressure rollers that press the pen roller at a position downstream of the recording paper conveyance path from a position that supports the pen nib on the outer circumferential surface of the pen roller and are spaced apart from each other; 1. A recording paper transport mechanism for an electrocardiograph, comprising a drive means for rotating at least one of the pressure rollers.