JPH02209357A - Uncurler for roll paper - Google Patents

Abstract

PURPOSE:To aim at automatic adjustments for a handling angle of roll paper by pivotally supporting one side of a roll paper storage semicylindrical member, while elastically supporting the other side with an adjustable spring, and optionally locating a free end side in accord with roll paper weight. CONSTITUTION:The other end 12b of a roll paper (1) storage semicylindrical member 21, whose one end is pivotally supported by a hinge 13, is elastically supported by an adjustable spring 16 through an adjusting screw 15. Therefore this free end 12b is able to adjust its position optionally according to weight of the roll paper 1. With this positioning, a roll paper handling angle being formed by a fall in a gap with an edge part of a fixed uncurling guide 17 is automatically adjusted according to the weight of the roll paper 1, thus an uncurling effect is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a decurling device that removes curls from roll paper to be used, for example, in a facsimile machine, thereby smoothing its supply.

[Prior Art] FIG. 5 is a block diagram schematically showing a conventional roll paper decurling device of this type. In the figure, 1 is thermal recording paper 3
(hereinafter simply referred to as thermal paper)
Reference numeral 2 denotes a curl removing plate whose one end is fixed to a shaft 4 and rotates around the shaft 4 to constantly circumscribe the roll paper 1. Reference numeral 5 denotes a thermal head installed downstream of the curl removing plate 2 in the thermal paper transport path. , 6 is a roller platen placed in pressure contact with the thermal head 5, and 7 is a cutter installed on the downstream side of the roller platen 6, with a fixed blade 7a.
and a rotary blade 7b, and when the rotary blade 7b is in the standby position shown, the thermal paper 3 unwound from the roll paper 1
can pass under the rotary blade 7b.

8 is a discharge roller for discharging the thermal paper 3 cut by the cutter 7; 9 is a stacker for receiving the thermal paper 3 sent out by the discharge port roller 8;
are guides disposed on the upstream and downstream sides of the thermal paper transport path, respectively.

Next, the operation of the above-mentioned conventional device will be explained. First, when the thermal head 5 records an image, the thermal paper 3 is fed out from the roll paper 1 by the rotation of the roller platen 6 and transported. At this time, the curl removal plate 2 is circumscribed to the roll paper 1, and the curled thermal paper 3 that has been unwound from the roll paper 1 is guided in the tangential direction of the roll paper 1 by the curl removal plate 2, and the plate is further freed. The winding direction of the roll is reversed at the edge P on the end side, and the curling tendency is reduced. Next, thermal paper 3 with reduced curling
is guided by the guide IO and introduced into the thermal head 5 section, where required printing is performed.

Meanwhile, the roller platen 6 continues to feed the thermal paper 3 downstream, and the rotary blade 7b cuts the leading edge of the thermal paper 3 on which printing is being performed.
The paper is transferred to the guide 11 by passing under it, and further transferred to the discharge roller 8 section, and when it reaches a predetermined position, the feeding operation is stopped. Thereafter, the rotary blade 7b rotates clockwise as shown by the arrow to cut and separate the recorded thermal paper 3 from the unrecorded thermal paper 3. The separated recorded thermal paper 3 is sent by a discharge roller 8 and discharged onto a stacker 9.

The above operations are repeated while the facsimile is receiving, and during that time the curl removal plate 5 rotates around the shaft 4 and constantly circumscribes the roll paper 1, causing changes in the diameter of the roll paper 1 (when using thermal paper). ff1), the angle α of the thermal paper reversing portion is narrowed to increase the curl removal effect.

[Problem to be Solved by the Invention] However, in the case where the flat curl removal plate 5 as described above is used to reduce the curling tendency of the roll paper 1, the curl removal plate 5 occupies The space becomes larger and the device becomes larger. Furthermore, if the curl removal plate 5 only follows the change in the diameter of the roll paper 1, it will not be possible to set an appropriate thermal paper reversal angle according to the quality (weight) of the roll paper, etc. The problem was that α could not be obtained either.

SUMMARY OF THE INVENTION In view of the above-mentioned points, an object of the present invention is to provide a roll paper decurling device that is compact and capable of achieving a sufficient decurling effect depending on the paper quality.

[Means for Solving the Problems] A roll paper decurling device according to the present invention includes a semi-cylindrical member for storing roll paper that is open upwardly and whose one edge is pivotally supported, and the semi-cylindrical member. a spring for elastically supporting the free end of the member; a spring force adjusting means for the spring; and a conveying roller for feeding out the roll paper from within the semi-cylindrical member while contacting the free end side edge of the semi-cylindrical member; A curl removal guide is provided in the middle of the roll paper transport path between the roller and the semi-cylindrical member to handle the unrolled roll paper in a direction opposite to the roll winding direction. The structure is such that the drop between the edge of the take-up guide and the free end side edge of the semi-cylindrical member can be adjusted by the spring force adjusting means.

[Operations] In the present invention, the semi-cylindrical member that accommodates the roll paper is
Since the - side is supported pivotably and the other side is elastically supported by an adjustable spring, the semi-cylindrical member can move its free end to any position in the vertical direction depending on the paper quality (weight) of the roll paper. This makes it possible to automatically adjust the roll paper handling angle formed by the drop between the free end side edge and the edge of the decurling guide. Further, according to the present invention, since the semi-cylindrical member itself that accommodates the roll paper serves as one end of the guide for removing curls from the roll paper, the apparatus can be easily miniaturized.

[Embodiment] The present invention will be described below with reference to an embodiment in FIGS. 1 to 4, in which parts corresponding to the conventional ones are denoted by the same reference numerals. Roll paper 1
is opened upward and has one side edge 12a at the attachment site.
A semi-cylindrical member 12 for storing rolled paper is pivotally supported by a hinge 13 on the main body of the facsimile. This forms an outward facing flange 12C extending in the longitudinal direction, and a hole 12d is bored in the flange 12c.

A screw 14 hanging down from a thermal paper guiding guide 13 fixed to the main body side is inserted into the hole 12d, and an adjusting screw 15 and a collar 1 mounted on the screw insertion end are inserted into the hole 12d.
A coil spring 1B is elastically mounted between the hole 2c and the periphery of the hole 2c, so that the free end of the semi-cylindrical member 12 is elastically supported by the coil spring 16.

Further, near the free end side edge 12b of the semi-cylindrical member 12, a curl removal guide 17 having an angular cross-section is fixed to the main body, and is located on the downstream side of the thermal paper transfer path.
The thermal paper 3 fed out from the roll paper 1 inserted into the tube is handled in a direction opposite to the roll winding direction to reduce its curling tendency.

A drop H between the edge P of the curl removal guide 17 and the free end side edge 12b of the semi-cylindrical member 12 (in this embodiment, the edge P is always at a lower position than the edge 12b in accordance with the rotation direction of the roll paper). ) is performed by rotating the adjusting screw 15 to adjust the elastic force of the coil spring 16. The configuration other than the above is the same as the conventional one, so a description thereof will be omitted.

Because of the above configuration, in the device of this embodiment, when a roll paper 1 with a large diameter is set, the semi-cylindrical member 12 is pushed down by the weight of the roll paper 1 against the elastic force of the coil spring 16. The drop H between the free end side edge 12b and the edge P of the curl removal guide 17 becomes smaller, and the curl reduction effect becomes smaller.

Next, when the roll paper 1 is consumed, the weight of the roll paper 1 decreases, the semi-cylindrical member 12 is pushed up by the coil spring 1G, the head height H increases, and the curl reduction effect is enhanced.

Needless to say, roll-shaped recording paper generally curls more strongly when the roll diameter is small than when the roll diameter is large. Therefore, the amount of curl reduction in the curl removal device needs to be small for roll paper with a large winding diameter, and large for roll paper with a small winding diameter. This can be done automatically using changes in weight.

In addition, in this embodiment, the pressure of the coil spring 16 can be arbitrarily adjusted using the adjustment screw 15, so by changing the head H, various types of paper can be used, from paper that curls easily to paper that curls easily. It is now possible to respond to a wide range of issues.

Incidentally, the method of reducing curl by handling has been a well-known technique since ancient times, but its effects, that is, the control of the amount of curl reduction, have not been much considered.

In the present invention, the mutual positional relationship between the edge P of the guide 17 and the edge 12b of the semi-cylindrical member 12 is determined by a coefficient obtained by dividing the head H by the distance 11fIB (FIG. 2) between the guide 17 and the semi-cylindrical member 12. It has been experimentally found that by setting it within the range of (1, 2 to 2.0), a more appropriate curl reduction effect can be obtained (see Fig. 4). This experiment was conducted using A4 width x 100 meter roll paper and 84 width x 100 meter roll paper, and the roll paper was stored using the same throwing method as in the above example, but other It goes without saying that similar effects can be obtained by selecting appropriate coefficients even when roll paper or other storage methods are used.

In the above-described embodiment, the initial setting of the spring pressure of the coil spring 16 according to the roll paper is performed manually, but it is also possible to connect the adjustment screw 15 for adjusting the spring pressure to the drive source. The above adjustment may be automated, or a sensor for detecting the roll diameter may be connected to this drive source to perform automatic control using both changes in the roll diameter and changes in the W1 amount of the roll paper. .

[Effects of the Invention] As described above, according to the present invention, the semi-cylindrical member accommodating the roll paper is pivotally supported on the negative side and elastically supported on the other side by an adjustable spring. With this configuration, the free end of the semi-cylindrical member can be set at any position in the vertical direction depending on the paper quality (weight) of the roll paper, and thereby the free end side edge and the edge of the curl removal guide are It is possible to automatically adjust the roll paper handling angle formed by the difference in height between the paper rolls, and the semi-cylindrical member that houses the roll paper itself serves as one end of the guide for removing curls from the roll paper, making the device more compact. This has the effect of making it easier.

[Brief explanation of the drawing]

FIG. 1 is a block diagram schematically showing a roll paper curl remover according to an embodiment of the present invention, FIG. 2 is an enlarged side view of the main parts, and FIG. 3 is a roll paper curl remover. An explanatory diagram showing the state, Fig. 4 is an explanatory diagram showing experimental data on how the mutual positional relationship between the edge of the guide and the semi-cylindrical member affects the curl reduction effect, and Fig. 5 shows the conventional device. This is a diagram equivalent to Figure 1. In the figure, 1 is a roll paper, 6 is a roller platen (conveyance roller), 12 is a semi-cylindrical member, 12a is one side edge, 1
2b is a free end side edge, 13 is a hinge, 14 is a screw (spring force adjustment means), 15 is an adjustment screw (spring force adjustment means), 1
B is a coil spring (spring), 17 is a curl removal guide, P
is edge, H is head.

Claims (1)

[Claims] a semi-cylindrical member for storing roll paper which is open upwardly and is pivotally supported at one side edge; a spring that elastically supports the free end of the semi-cylindrical member; a spring force adjusting means for the spring; A conveying roller for feeding out the roll paper from inside the semi-cylindrical member while making contact with the free end side edge of the semi-cylindrical member, and fixedly installed in the middle of the roll paper transport path between this roller and the semi-cylindrical member. and a curl removal guide that handles the unrolled roll paper in a counter-roll winding direction, and a drop between an edge of the curl removal guide and a free end side edge of the semi-cylindrical member when the roll paper is attached. A device for removing curls from rolled paper, characterized in that it is configured to be adjustable by the spring force adjusting means.