JPH02269Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording winding device used in a pen recorder or the like that records the time course of voltage values while continuously rotating a roll of recording paper. In particular, the present invention aims to ensure smooth winding without slack when winding up the recording paper after recording.

Conventionally, various means for winding up recorded paper have been developed. Normally, in order to maintain a constant tension on the recording paper even though the winding diameter of the recording paper on the supply side and the receiving side changes from moment to moment, mechanisms using slip gears or motor rotation control are often used. However, these conventional paper winding devices have the disadvantage that it is difficult to manage the slip torque due to surface wear of the slip gear, and it is disadvantageous in terms of cost.

The present invention is constructed at low cost without using a slip gear by slipping the pulley and belt by changing the belt tension using a coil spring and controlling the winding of recording paper.

FIG. 1 is a perspective view of a recording paper winding device according to an embodiment of the present invention, FIG. 2 is a front view of the same embodiment at the beginning of winding, and FIG. 3 is a front view of the same embodiment during winding.

In Fig. 1, 1 is the printer drive shaft;
Recording paper P is continuously fed to the recording surface by this printer drive shaft 1. Reference numeral 2 denotes a freely rotatable supply side rotating shaft, to which a roll of recording paper P is attached. A supply pulley 3 is integrally attached to the rotating shaft 2, and a belt 4 is wound around the supply pulley.
Reference numeral 5 denotes a take-up pulley that is integrally attached to the take-up rotating shaft 6, and around which the belt 4 is wound. Reference numeral 9 denotes an arm, one end of which is rotatably attached to the rotating shaft 2, and a pin 10 fixed to the other end. 7 is a coil spring attached between the pin 10 and the fixed pin 11, and 8 is an idler rotatably attached to the pin 10, which applies tension to the belt 4 by the biasing force of the coil spring 7. It should be noted that if the belt 4 does not have the coil spring 7, there will be slack, the pulley 3 will slip, and no rotational force will be transmitted to the belt 4. Reference numeral 12 denotes a recording pen, which moves perpendicularly to the traveling direction of the recording paper P in accordance with a data signal (time course of voltage values, etc.) to record data on the recording paper.

Next, the operation of this embodiment will be explained.

The beginning of winding the recording paper is structured as shown in Figure 2. In FIG. 2, when the drive shaft 1 is driven to rotate, the recording paper P is supplied toward the recording pen 12. As shown in FIG. Due to this movement of the recording paper P, the supply side roll 13
a. The supply side rotating shaft 2 and the supply pulley 3 rotate.
At this time, the coil spring 7 is compressed, and the idler 8 applies tension to the belt 4. Therefore, the rotation of the supply pulley 3 causes the belt 4 to rotate counterclockwise, and the take-up pulley 5, the take-up rotating shaft 6, and the take-up roll 14a rotate without slipping.

In the case of Figure 2, pulleys 3 and 5 and roll 13
Since the radius ratio with a and 14a is well balanced, the belt 4 does not slip. This relationship will be explained using specific numerical values.

Here, the radius P ₁ of the supply pulley 3 is 60 mm, the radius K ₁ of the roll 13a is 120 mm, the radius P ₂ of the take-up pulley 5 is 20 mm, and the radius K ₂ of the roll 14a is 40 mm.
mm. Comparing the left and right rotation ratios, K ₂ /P ₂ = 40/20 = 2, K ₁ /P ₁ = 120/60 = 2, and since the rotation ratios of both are the same, there is no slip in the belt 4 and the coil spring 7 remains shrunk. The idler 8 is rotated by the movement of the belt 4.

Next, the recording paper P is wound up on the winding side roll,
When the state shown in FIG. 3 occurs, the belt 4 slips.

In Fig. 3, the radius P ₁ of the supply pulley 3 is
The radius K ₃ of the roll 13b is 110 mm, the radius P ₂ of the take-up pulley 5 is 20 mm, and the radius K ₄ of the roll 14b is 60 mm. Comparing the left and right rotation ratios, K ₄ /P ₂ = 60/20 = 3, K ₃ /P ₁ = 110/60≈1.83, and the rotation ratio on the winding side becomes larger.

Here, it is assumed that the recording paper P is moved by 10 mm due to the rotation of the printer drive shaft 1. The supply pulley 3 tries to move by 5.45mm because 10×P ₁ /K ₃ = 10×60/110≒5.45mm. Due to the movement of the supply pulley 3, the roll 14b attempts to move by 16.35mm, as 5.45×K ₄ /P ₂ =5.45×60/20=16.35mm.

Therefore, although the supply roll 13b moves only 10 mm, the take-up roll 14b attempts to move 16.35 mm, causing the left-right balance to collapse.
The lower side of the belt 4 tries to push the idler 8 downward against the urging force of the coil spring 7. At this moment, the belt 4 slackens with respect to each pulley 3, 5, so each pulley 3, 5 slips with respect to the belt 4 by 6.35 mm (16.35-10=6.35).

This slip restores the balance between the left and right pulleys 3 and 5, and the idler 8 pulls the belt 4 upward due to the biasing force of the coil spring 7.
After that, the balance is lost again, the belt 4 becomes slack, and the pulleys 3 and 5 slip. In the case of FIG. 3, the recording paper P is continuously wound up by repeating the above operations.

As is clear from the above embodiment, the present invention has a structure in which tension is applied to a slack belt using a coil spring, and the unbalance of the rotation ratio is absorbed by the slip of the belt, etc., so that the recording paper can be continuously This has the effect that a winding device for a recorder that rotates and winds up the recorder can be constructed at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a recording paper winding device according to an embodiment of the present invention, FIG. 2 is a front view of the same device at the beginning of winding, and FIG. 3 is a front view of the same device during winding. 1... Printer drive shaft, 2... Supply side rotating shaft,
3... Supply side pulley, 4... Belt, 5... Winding side pulley, 6... Winding side rotating shaft, 7...
Coil spring, 8... idler, 13, 14... roll.

Claims (1)

[Scope of utility model registration request] A supply-side rotation shaft rotatably attached to the main body, a supply-side pulley attached to the supply-side rotation shaft, a supply-side recording paper roll attached to the supply-side rotation shaft, and a supply-side rotation shaft rotatably attached to the main body. A take-up side rotation shaft attached to the take-up side rotation shaft, a take-up side pulley attached to the take-up side rotation shaft, and a take-up side pulley attached to the take-up side rotation shaft, capable of winding the recording paper of the supply side recording paper roll. a recording paper roll on the winding side; a printer drive shaft provided between the recording paper roll on the supply side and the recording paper roll on the winding side for continuously moving the recording paper; A recording paper winding device comprising: a belt wound around a take-up pulley with slack; and a coil spring biasing the belt in a direction to eliminate slack through an idler in contact with a beam side of the belt.