JPH0747406Y2 - Continuous paper tension adjusting device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a tension adjusting device for a continuous paper which is pulled out from a roll body of the continuous paper.

[Conventional technology]

As shown in FIG. 5, a roll A of continuous paper S is attached to the support shaft 20.
Paper, and the continuous paper S pulled out from the roll A
A pair of feed rollers 21 are provided in the transfer path of the
It has been customary conventionally to feed the continuous paper S by the rotation of 21 and perform appropriate processing such as printing on the continuous paper.

In the continuous paper feeding device as described above, the support shaft 20
With the configuration in which the roll body A is simply fitted to and is rotatably supported, when the continuous paper S is fed and stopped, the roll body A is rotated by inertia, and the continuous paper S is fed by the rotation. The slack occurs in the paper S, the continuous paper S meanders, and the slack of the continuous paper wraps around other parts.

In order to solve the above-mentioned problems, a tension adjusting device has been conventionally known which applies a rotation resistance to the roll body A to prevent the roll body A from rotating due to inertia.

[Problems to be solved by the device]

By the way, in the tension adjusting device for imparting rotational resistance to the roll body A, the tension of the continuous paper S becomes abnormally high at the initial stage of rotation of the feed roller 21, and the continuous paper S is broken due to the increase in the tension, or the feed roller 21 There is a disadvantage that the continuous paper S cannot be accurately conveyed because of slippage between the continuous paper S and the continuous paper S.

In addition, as shown in FIG.
In the case where the support frame 22 is supported by a rail 24 attached to the inner surface of the side wall of the box 23 so that it can be pulled out to the outside of the box 23 and conversion work of the roll A can be performed outside the box 23, When the support frame 22 is pulled out, the continuous paper S is fed out from the roll body A, and when the support frame 22 is inserted into the box 23, the continuous paper S sags, and a tension adjusting device that imparts rotational resistance to the roll body A. Then, there is a disadvantage that the slack of the continuous paper due to the insertion and removal of the support frame 22 cannot be absorbed.

Then, this invention makes it a technical subject to solve the above-mentioned inconvenience and to maintain the tension of continuous paper always constant.

[Means for Solving the Problems]

In order to solve the above problems, in the present invention, a support cylinder to which a roll body of continuous paper is detachably attached, a fixed support shaft for rotatably supporting the support cylinder, and A motor that rotates the support cylinder, a guide for the running of the continuous paper drawn from the roll, and a tension detection roller that is moved from the reference position due to the change in tension of the continuous paper, and a reference position with respect to the transport direction of the continuous paper. From the tension detection roller that is moved in both forward and reverse directions, and a detector that detects the movement of the tension detection roller in the forward direction and operates the motor to rotate the support cylinder in the direction of feeding the continuous paper from the roll body, The detector is configured to detect the movement of the tension detecting roller in the opposite direction, operate the motor, and rotate the support cylinder in the direction in which the roll body winds the continuous paper.

[Action]

With the above configuration, the tension detecting roller moves according to the change in tension of the continuous paper, and the movement absorbs the change in tension of the continuous paper. In addition, the detector detects the movement of the tension detection roller, the motor is driven by the detection signal from the detector to rotate the support cylinder in either the forward or reverse direction, and by the rotation of the roll body that rotates together with the support cylinder. The continuous paper is fed out or wound up, and the tension of the continuous paper is kept constant by the rotation of the roll body.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

As shown in FIG. 1 and FIG. 2, one end of a support shaft 2 is supported by a plate-shaped support frame 1, and the support shaft 2 has two ends.
A support cylinder 4 is rotatably supported via individual bearings 3.

A support plate 5 is fixed to a portion of the support shaft 2 located inside the support cylinder 4, and a motor 6 is supported on the support plate 5. A gear 8 is attached to the rotary shaft 7 of the motor 6, and the gear 8 meshes with a gear 9 fixed inside the support cylinder 4.

Therefore, by driving the motor 6, the support shaft 2
The support cylinder 4 rotates around.

The mounting position of the motor 6 is not limited to the illustrated example, and for example, the motor may be attached to the support frame 1 and a pair of gears for transmitting the rotation of the motor to the support cylinder may be provided between the support cylinder and the support frame.

A roll body A of the continuous paper S is detachably set on the outer side of the support cylinder 4, and the roll body A is retained by a hook 19 'at the tip of an elastic piece 19 provided on the support cylinder 4. Further, the roll body A and the support cylinder 4 are integrally rotated by the engagement of the notch portion b provided on the paper tube a of the roll body A and the pin 10 provided on the outer periphery of the end portion of the support cylinder 4.

Here, the continuous paper S may be any of paper, laminated paper, film and sheet. The continuous paper S drawn from the roll body A is guided by a plurality of rollers 11 supported by the support frame 1 and is moved by the rotation of a pair of feed rollers 12. A tension detecting roller 13 for guiding the running of the continuous paper S is provided on the transfer path of the continuous paper S.

3 and 4 show the support portion of the tension detecting roller 13. The tension detection roller 13 is rotatably supported on one end of a roller arm 14, and a pin 15 fixed to the other end of the roller arm 14 is rotatably supported on the support frame 1 via a bearing 16.

The elastic force of the spring 17 is applied to the roller arm 14, and the roller arm 14 is deflected by the elastic force in the direction in which the tension detecting roller 13 applies tension to the continuous paper S.

When the tension of the continuous paper S is at the set value and the set tension and the elasticity of the spring 17 are in equilibrium, the tension detection roller 13 is held at the reference position a. Therefore, when the tension of the continuous paper S changes from the set tension, the tension detecting roller 13 moves from the reference position a in the transport direction of the continuous paper S or in the opposite direction.

A semicircular detection piece 18 is attached to the end of the pin 15,
A first detector PH ₁ and a second detector PH ₂ that detect the moving direction of the tension detection roller 13 based on the presence or absence of the detection piece 18 around the detection piece 18.
Are provided, and the operation of the motor 6 is controlled based on the detection signals of the detectors PH ₁ and PH ₂ .

That is, when the first detector PH ₁ detects the detection piece 18, the motor 6 causes the roll body A to wind in the direction in which the continuous paper S is wound up.
To rotate. When the second detector PH ₂ detects the detection piece 18, the motor 6 rotates the support cylinder 4 in the direction in which the roll body A feeds the continuous paper S.

The tension adjusting device shown in the embodiment has the above structure, and when the tension of the continuous paper S fed by the rotation of the feed roller 12 is at the set tension, the tension detecting roller 13 is held at the reference position a, The motor 6 is in a stopped state.

When the tension of the continuous paper S exceeds the set tension, the roller arm 14 swings around the pin 15 due to the change in the tension, and the tension detecting roller 13 moves the continuous paper S as indicated by the chain line X in FIG.
And the change in tension of the continuous paper S is absorbed.

Further, the detection piece 18 rotates together with the pin 13, and the second detector PH ₂
When the detecting piece 18 detects the detection piece 18, the motor 6 is activated by the detection signal from the second detector PH ₂ . At this time, since the motor 6 rotates the support cylinder 4 in the direction in which the roll body A feeds the continuous paper S, the continuous paper S is fed from the roll body A, and the tension of the continuous paper S is weakened by the feeding of the continuous paper S. The tension change causes the tension detection roller 13 to return to the reference position B, and the detection piece 18 rotates in a direction away from the second detector PH ₂ . When the second detector PH ₂ detects that there is no detection piece 18, the motor 6 stops. As a result, the tension of the continuous paper S is maintained at the set tension.

Further, when the tension of the continuous paper S becomes smaller than the set tension, the tension detecting roller 13 causes the continuous paper S to move as shown by the chain line Y in FIG.
Moves in the direction opposite to the transport direction of the continuous paper S to absorb the change in tension of the continuous paper S. By the movement of the tension detection roller 13, the detection piece 18
Rotates around the pin 15 in the opposite direction to the first detector PH
_{When 1} detects the detection piece 18, the motor 6 operates and the roll body A rotates the support cylinder 4 in the direction in which the continuous paper S is wound.

By winding the continuous paper S, the tension of the continuous paper S increases,
The tension detection 13 is returned to the reference position, and the detection piece 18 rotates in the direction away from the first detector PH ₁ and the first detector P
The motor 6 detecting that H ₁ does not have the detection piece 18 is stopped. As a result, the tension of the continuous paper S is kept constant.

In the case of the embodiment, the tension detecting roller 13 is supported by the roller arm 14 and the roller arm 14 is swingably supported by the supporting frame 1, but the support of the tension detecting roller 13 is not limited to this. .

For example, a support piece is provided so as to face the support frame 1, a vertically long guide hole is formed in the support piece and the support frame 1, and both ends of the tension detection roller are movably supported along the guide hole. However, the tension detection roller may be moved along the guide hole by the tension and the weight of the continuous paper.

[Effect of device]

As described above, in the tension adjusting device according to the present invention, when the tension of the continuous paper changes, the tension detecting roller moves to absorb the change in the tension of the continuous paper, and at the same time, the motor operates to rotate the support cylinder, Since the roll body that rotates together with the support cylinder feeds or winds the continuous paper, the tension of the continuous paper can be quickly returned to an appropriate value.

Further, when the support frame that supports the support shaft and the support cylinder is provided so as to be freely drawn out, it is possible to remove the slack of the continuous paper due to the insertion and removal of the support frame.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a tension adjusting device according to the present invention, FIG. 2 is a vertical sectional front view showing a supporting portion of a roll body of the same, and FIG. 3 is a supporting portion of a tension detecting roller of the same. FIG. 4 is a side view of FIG. 3, and FIG. 5 is a schematic view of a continuous paper feeding device. 2 ...... support shaft 4 ...... support cylinder, 6 ...... motor, 13 ...... tension detection roller, PH _1, PH ₂ ...... detector.

Claims (1)

[Scope of utility model registration request] 1. A support cylinder to which a roll of continuous paper is detachably attached, a fixed support shaft for rotatably supporting the support cylinder, and a motor for rotating the support cylinder around the support shaft. A tension detection roller that guides the running of the continuous paper pulled out from the roll and moves in both forward and reverse directions from the reference position with respect to the continuous paper transport direction due to the change in tension of the continuous paper, and tension detection in the forward direction. A detector that detects the movement of the roller to operate the motor to rotate the support cylinder in the direction of feeding the continuous paper from the roll body, and a movement of the tension detection roller in the opposite direction to operate the motor, A continuous paper tension adjusting device comprising a detector that rotates a support cylinder in a direction in which a roll body winds the continuous paper.