JPH0361258A - Decurl mechanism and recording device using decurl mechanism - Google Patents

Abstract

PURPOSE:To make curl correction positively without enlarging the contact angle of sheet material with a decurl member more than necessary by setting the radius of curvature of the curved surface of a guide member larger than that of the decurl member. CONSTITUTION:At the time of conveying sheet material, a shifting means 26 stops in the balanced state between tension supplied to the sheet material and energizing force by an energizing means 35. Accordingly, when the tension is large, the influence of the energizing force on the shifting means 26 is small, and the acting quantity of the shifting means 26 becomes small and therefore the curvature of the sheet material becomes small. On the other hand, when the tension is small, the moving quantity of the shifting means 26 becomes large, and the curvature of the sheet material thereby becomes large. Curl correction corresponding to curl strength can be therefore made. In this case, the radius of curvature of the curved surface of a guide member 25 is larger than that of a decurl member 22, so that curl correction can be make positively without enlarging the contact angle of the sheet material with the decurl member 22 more than necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a decurling mechanism for correcting curling of a sheet material wound into a roll, and a recording apparatus having the decurling mechanism.

<Conventional technology> Today, office work such as facsimiles and printers 8! The recording system of these devices generally uses a roll sheet in which a long recording sheet is wound around a core.

Since this sheet material is wound into a roll, it is likely to be curled (hereinafter referred to as r-curl 1), and the curled sheet material is likely to jam during transportation. For this reason, many recording apparatuses that use the roll sheet are equipped with a decurling mechanism to remove or reduce the curl.

An example of the decurling mechanism is one constructed as shown in FIG. 12, for example.

This is configured such that a main body 51 and a lid 52 can be opened and closed by a pin 53, a roll holder 54, a platen roller 55, and a cutter 56 are provided in one main body 51, and the other lid 52 is provided with a roll holder 54, a platen roller 55 and a cutter 56.
2 is provided with a decurling shaft 57 and a recording head 58 that constitute a decurling mechanism.

To explain the operation of the device, a sheet roll 59a in which a sheet material 59 is wound into a roll shape is loaded into the roll holder 54, and the sheet material 59 is rolled by rotation of the platen roller 55.
The paper is conveyed via a decal shaft 57, an image is formed by a recording head 58, and the paper is canted by a cuffer 56 and discharged from the apparatus.

In the above-mentioned apparatus, curling is reduced by conveying the sheet material 59 while being bent in the opposite direction to curling by the decurling shaft 57.

Another example is the decal machine ff4 shown in FIG.
is proposed.

An arm 61 is rotatably attached around a guide shaft 60 that constitutes a decurling mechanism provided on the main body 51, and a decaling mechanism leaf 162 is rotatably attached to the rotating tip of this arm 61. There is. Further, the arm 61 is always urged in the counterclockwise rotation direction by the spring, and when the platen roller 55 rotates in the direction of the arrow, the rotational force is transmitted via a friction clutch (not shown), and the arm 58 is rotated in the clockwise rotation direction. It is configured so that it rotates. Furthermore, stop bars 63 and 64 for restricting rotation of the arm 61 are fixed at predetermined positions on the main body 51.

In the above device, when the platen roller 55 rotates in the direction of the arrow, the sheet material 59 is conveyed. At this time, the arm 61 also rotates in the clockwise direction, and when it comes into contact with the stopper 64, the friction clutch slips and the arm 61 rotates in the clockwise direction. The rotation of 61 is stopped. The sheet material 59 conveyed in this manner is conveyed from the sheet roll 59a through the guide shaft 6.degree. by the decurling shaft 62 while being bent in the opposite direction to the curl, so that the curl is corrected.

In this case, as shown in FIG. 14, it is known that the larger the central angle α of wrapping the sheet material 59 with respect to the decal shaft 62, the greater the curl correction effect.

When the rotation of the platen roller 55 stops, the arm 61 returns until it comes into contact with the stopper 63 due to the biasing force of the spring, and enters a standby state.

<Problems to be Solved by the Invention> In the decal mechanism shown in FIG. 12, the sheet material 59
As the sheet roll 59a is used, the diameter of the sheet roll 59a becomes smaller, and the center angle α of the wrapping of the sheet material 59 with respect to the decal shaft 57 gradually decreases (becomes) from α1 to α2.

Therefore, the curl removal effect of the sheet material 59 gradually decreases, and even though the curl is tighter as the roll diameter is smaller, sufficient curl removal may not be performed.

In the decal mechanism shown in FIG. 13, the sheet material 59
The central winding angle α with respect to the decal shaft 62 is a constant value regardless of the diameter of the sheet roll 59a.

However, as shown in FIG. 15, the sheet roll 59a
As the diameter of the sheet member 59 becomes smaller, the center angle β of the winding of the sheet material 59 with respect to the guide shaft 60 increases from β1 to β2.

Since the sheet material 59 is wound around the guide shaft 60 in the same direction as the curl, the smaller the diameter of the sheet roll 59a, the more the sheet material 59 is warped by the guide shaft 60 in the same direction as the curl, and the decal shaft 62
There was a risk that the curl removal effect of the method would be canceled out.

Furthermore, as shown in FIG. 16, if the length of the arm 61 is changed to make the central winding angle α with respect to the decal shaft 62 sufficiently larger than the central winding angle β with respect to the guide shaft 60, the conveyance path becomes complicated. Therefore, the sheet material 59 is difficult to set, and there is a possibility that a jam may occur. Also, AJ
, 61 to rotate, the problem is that the device becomes larger.

The present invention solves the above problems of the prior art and provides a decurling mechanism in which the radius of curvature of the curved surface of the guide member is larger than the radius of curvature of the curved surface of the decurling member, and a recording device having the decurling mechanism.

Means for Solving the Problems> Representative means of the present invention for solving the problems described above include a conveyance means for conveying the sheet material, and a curved surface for bending and guiding the seam A to be conveyed. a decurl member having an open surface that guides the conveyance of the sheet and has a radius of curvature larger than a radius of curvature of the decurl member; The present invention is characterized in that a decurling mechanism is constructed by providing a moving means and a biasing means for biasing the moving means in a direction in which the bending of the sheet material increases.

Effect> In the above means, when conveying the notebook material, the moving means stops in a state where the tension applied to the sheet material and the urging force of the urging means are balanced. Therefore, when the tension is large, the influence of the biasing force on the moving means is small, and the amount of movement of the moving means is small, so that the bending shape of the sheet material is small. On the other hand, when the tension is small, the amount of movement of the moving means becomes large, contrary to the above, and the deflection 111jffl of the sheet material becomes large. As a result, curl correction is performed according to the curl strength.

Further, since the moving means is biased by the urging means, no load is applied to the conveying means to operate the moving means.

In addition, by making the radius of curvature of the curved surface of the guide member larger than the radius of curvature of the curved surface of the decal part, when wrapping the sheet material around the decal member, stronger curl correction can be achieved without making the corners unnecessarily large. I can do it.

Furthermore, since there is little deflection due to the wrapping of the sheet material around the guide member, it is possible to simplify the conveyance route, downsize the apparatus, and reduce the occurrence of jams.

Furthermore, by providing the guide member and the decal member separately in the main body of the device and the lid, the guide member and the decal member are separated by a large distance when the lid is opened, making it easy to load the sheet material. You will get it.

Furthermore, by making the moving force of the moving means larger than the urging force of the urging means against the moving means, it is possible to move the moving means in a direction in which the sheet material does not bend against the urging of the urging means. It is possible to prevent the sheet material from being decurled more than necessary while it is in a waiting state for transportation.

Further, by increasing the self-holding force of the drive source of the moving means to a certain extent, the relationship between the guide member and the decal member can be maintained appropriately.

Further, the recording device is configured by providing the decurling mechanism, the conveyance means and the moving means are operated by the same drive source, and the drive source is driven so as to transport the sheet material backward from the cutter to the recording means. By occasionally returning the moving means to the initial position, the moving means is always located at the initial position in the recording standby state.

Further, by setting the output of the drive source to be larger when the sheet material is being transported in the opposite direction to the recording direction than when the sheet material is being transported in the recording direction, it is possible to stably transport the sheet material. It is something.

<Embodiment> Next, an embodiment in which the above means is applied to a facsimile machine will be described.

[First example]

1 and 2 are perspective views of a recording system of a facsimile machine, and FIG. 3 is a cross-sectional view of the entire apparatus.

As shown in FIG. 3, this factor ξ deviation apparatus is comprised of a recording system B having a decurling mechanism A and an original reading system C.

First, the overall configuration will be briefly described with reference to FIG. 3. Recording system B has a lid 2 on an apparatus main body l that can be opened and closed by a shaft 3, and the lid 2 is attached to the main body l by a click mechanism (not shown). It is constructed so that it can be locked to. Further, a roll holder 4 is provided at a predetermined position on the back side of the main body of the recording system, and a roll 5a of a heat-sensitive sheet material 5 wound into a roll is loaded into the holder 4. This sheet material 5 is conveyed by the rotation of a platen roller 6a which constitutes a conveying means 116, and at this time, when passing through the decurling structure A, the sheet material 5 is bent in the opposite direction to the curl direction, thereby correcting the curl. Ru.

A predetermined image is formed on the sheet material 5 whose curl has been corrected in a recording means 6, and the sheet material 5 after recording is canted by a cutter 7 and discharged by a discharge roller 8 to a discharge stacker 9. There is.

The original reading system C sets a plurality of originals 11 on the original placing table lO formed on the upper surface of the lid 2, and when a reading operation is performed, several originals from the bottom among the plurality of set originals 11 are read. 2 are conveyed by a preliminary conveyance roller 12a and a pressing member 12b in pressure contact therewith, and separated and supplied one by one by a separation roller 13a and a pressing member 13b in pressure contact therewith. Further separated manuscript 1
1 is a pair of transport rollers 14a, t, ib and 15a, 15b
While being conveyed by The data is transmitted to the recording system B of the machine, and in the case of facsimile mode, it is transmitted to the recording system of another machine.

Next, the configuration of each part of the recording system B having the decurling mechanism hole in the factor ξ deviation device will be explained in detail.

The roll holder 4 is formed with an open top, and is arranged at the back side of the recording system main body l. The roll holder 4 is loaded with a sheet roll 5a, and the outer circumferential surface of the roll 5a and the inner surface of the holder 4 come into contact with each other, creating frictional resistance. That is, when the sheet material 5 is drawn out, when the roll 5a has a large diameter and is heavy, a large frictional resistance is generated, and as the sheet material 5 is drawn out and the weight of the roll 5a decreases, the frictional resistance also decreases. . This frictional resistance has the effect of applying tension to the sheet material 5 when it is pulled out, and the sheet material 5 that is drawn out is proportional to the magnitude of the frictional resistance.
The tension applied also changes.

Recording means 6 for recording a predetermined image on the sheet material 5
The configuration consists of a platen roller 6a and a recording head 6b. The platen roller 6a is a roller-shaped member made of a material having a high I'j friction coefficient such as hard rubber, which is rotatably attached to the main body l, and is driven by a motor 20 serving as a drive source. It consists of That is, as shown in FIG. 1, the rotational force of the motor 20 is transmitted from a gear 21a fixed to the motor shaft to a gear 21c fixed to the roll shaft of the platen roller 6a via an intermediate gear 21b.
The platen roller 6a rotates. This platen roller 6
The sheet material 1-5 is conveyed by the rotation of a, and the platen roller 6a also serves as a means for conveying the sheet material 5.

The recording head 6b forms an image on the sheet material 5 by heating the sheet material 5 in accordance with an image signal, and is configured to press the platen roller 6a via the sheet material 5. . In the concrete direction, the lid body 2 is
The platen roller 6a is rotatably attached to the platen roller 6a by a compression spring 6d when the lid body 2 is closed. Therefore, when the platen roller 6a rotates with the sheet material 5 inserted between the platen roller 6a and the recording roller b, the sheet material 5 is conveyed.

The recording head 6b in this embodiment uses a so-called line-type thermal head in which a large number of heating elements 6b that generate heat when energized are arranged in the width direction of the sheet material 5 on the surface that contacts the sheet material 5. The sheet material 5 is selectively heated by energizing the heat generating element 6b in accordance with the image signal, and the heat-sensitive sheet material 5 is colored to perform recording.

Next, the cutter 7 has a fixed blade 7a and a driving blade 7b in this embodiment.
A rotary cutter consisting of is used. Specifically, the fixed blade 7a is fixed to the main body 1, and the driving blade 7b is attached so as to be rotatable about a shaft 7c, and when the driving blade 7b is rotated by the driving means, it rubs against the fixed blade 7a. This is for cutting the sheet material 5.

The drive blade 1b may be configured to be driven by a rotor 20 that drives the platen roller 6a, or may be driven by another independent motor.

The sheet material 5 canted by the cutter 7 is discharged to the stacker 9 by a discharge roller 8 driven by a drive means (not shown), but since the sheet material 5 used for recording is wound around the core 5b, The sheet is curled when it is pulled out from the sheet roll 5a.

The curl varies depending on the diameter of the roll 5a.

For example, the curl that occurs when the roll diameter is large has a small curl height h shown in FIG. 4(a), and as the roll diameter becomes small, the curl height h increases, and
It curls up as shown in b).

In the apparatus of this embodiment, the curl is corrected when the sheet material 5 passes through the decurling mechanism A.

That is, the position of the guide shaft 23 serving as a guide member is configured to be movable with respect to the decal shaft 22 serving as a decurling member, and the sheet material 5
The curl is corrected by being bent in the opposite direction to the curl direction when being guided.

Further, the guide shaft 23 is biased against the sheet material 5 by a biasing means to be described later, and there are two cases in which the guide shaft 23 is loaded with a large diameter roll 5a as shown in FIG. 5 and when a small diameter roll 5a as shown in FIG. 6 is loaded. The decal effects are different.

Here, the structure of the decurling mechanism A will be specifically explained.

The decal shaft 22 is rotatably attached to a mounting member 24 fixed to the lid body 2 as shown in FIGS. 1 and 2. This decal shaft 22 is, for example, 4 m in diameter.
It consists of a metal shaft.

The mounting member 24 is a flat plate 24 that serves as a guide for the sheet material 5.
a, and brackets 2 formed upright on both ends of the flat plate 24a.
4b, and the distance between the two plackets 24b is larger than the width of the sheet material 5, and smaller than the distance between the arms supporting both ends of the guide shaft 23, which will be described later.

As shown in FIGS. 5 and 6, the position of the decal shaft 22 relative to the main body 1 when the lid 2 is closed is always constant, and the position at this time is the position of the sheet material 5 relative to the platen roller 6a. It is disposed on the upstream side in the conveyance direction and at a position where the angle at which the sheet material 5 is introduced into the platen roller 6a is not too large.

Further, a guide 37 is provided on the main body l facing the decal shaft 22 to guide the sheet material 5 pulled out from the roll 5a to the platen roller 6a. One end of this guide 37 extends to the vicinity of the platen roller 6a, and the other end is configured to be integrated with the roll holder 4.

On the other hand, the guide shaft 23 is constituted by a metal shaft having a diameter of 6M, for example, and the decal shaft 23 is made of a metal shaft having a diameter of 6M.
The radius of curvature is larger than 2.

Further, the guide shaft 23 is configured to be movable relative to the decal shaft 22 by a moving means. As shown in the perspective explanatory view in FIG. 7 and the cross-sectional explanatory view in FIG. The guide shaft 23 is rotatably attached, and when the shaft 25 rotates, the arm 26 rotates integrally, thereby causing the guide shaft 2 to rotate relative to the decal shaft 22.
3 is movable.

The shaft 25 is rotatably attached to the main body l via a bearing 27, and a clutch flange 28, a clutch gear 29, and a spring clutch 30 are attached to one end of the shaft, so that rotational force in one direction is transmitted to the shaft 25. It is configured as follows.

The clutch flange 28 has a cylindrical portion 21La and a crocodile portion 28.
b, and is attached by a rotation pin 31 so as to rotate together with the shaft 25 in the same direction.

The clutch gear 29 is made up of a cylindrical portion 29a and a gear portion 29b, and the inner diameter of the hole through which the shaft 25 is inserted is slightly larger than the outer diameter of the shaft 25, and is rotatably attached to the 1rlh 25. .

The spring clutch 30 is formed by winding a spring steel wire, a spring band, a plastic wire, etc. into a coil, and the clutch flange 28 and both rotation cylinder portions 2 of the clutch flange 29 and the clutch 29 are connected to each other.
It is wound around the outer peripheries of 8a and 29a, and one end thereof is locked to the flange 28b of the clutch flange 28.

The honeycomb clutch 30 transmits the rotational force of the clutch gear 29 to the clutch flange 28 in only one direction, and not in the other direction. That is, when the clutch gear 29 rotates in one direction indicated by the arrow in FIG.
0 is loosened and becomes a free state, and no rotational force is transmitted to the clutch flange 28. On the other hand, when the clutch gear 29 rotates in the opposite direction of the arrow -a (hereinafter, a minus sign indicates the opposite direction of the arrow), the honeycomb clutch 30 tightens the cylindrical parts 28a and 29a to be in a locked state, and the clutch flange The rotational force is transmitted to 28, and the rotational force for moving the guide shaft 22 in the direction indicated by the arrow is transmitted.

The drive source for rotating the clutch gear 29 is the same as the drive source for rotating the platen roller 6a,
It is driven by a motor 20. That is, as shown in FIG. 1, the driving force of the motor 20 is transmitted through the gears 21a to
The gear 21c attached to the platen roller shaft meshes with the gear portion 29b of the clutch gear 29 via the intermediate gear 21d.

Therefore, as shown in FIG. 1, when the motor 20 rotates forward in the direction of the arrow, the platen roller 6a rotates in the direction of the arrow, and the clutch gear 29 rotates in the direction of the arrow. That is,
When the platen roller 6a rotates in the direction of drawing out the sheet material 5 in the direction of arrow C, the spring clutch 30 is in a free state.

Further, when the motor 20 rotates in the opposite direction of the arrow -C, the platen roller 6d rotates in a direction to reversely feed the sheet material 5, and at this time, the clutch gear 29 rotates in the direction of the arrow -a, and the honey clutch 30 rotates in the direction of the arrow -A. is in a locked state and transmits the rotational force that rotates the guide shaft 23 in the direction indicated by the arrow in FIG.

Next, the configuration of the biasing means for biasing the guide shaft 23 so as to balance the tension of the sheet material 5 will be explained.

As shown in FIGS. 7 and 8, a pulley 33 is fixed to the other end of the shaft 25 by a rotation pin 32. As shown in FIGS. A groove 33a is formed on the circumferential surface of this pulley 33, and a hook 34a is protruded from a predetermined position, and this hook 34a and a hook 34b protruded from a predetermined position of the main body 1 (see FIG. 2). A tension spring 35 is attached under tension between the two. That is, the pulley 33 is always urged in the direction of arrow f in FIG. 7 (the direction in which the decurling effect by the guide shaft 23 is increased) by the tensile force of the tension spring 35.

Further, a stopper 36 is provided at a predetermined position on the main body 1 within the rotation range of the arm 26.

This stopper 36 comes into contact with the arm 26 when it rotates in the direction of arrow -b in FIG. This is what you set.

Next, we will explain the operation when recording using the recording system B having the decurling mechanism A configured as described above, when the roll diameter is large as shown in FIG. 5, and when the roll diameter is small as shown in FIG. The explanation will focus on the curl straightening effect.

First, the lid body 2 is opened, the sheet roll 5a is loaded into the roll holder 4, and the leading edge of the sheet is pulled out to the platen roller 6a and then sent. At this time, as shown in FIGS. 1 and 2, the decal shaft 22 is attached to the lid 2 and the guide shaft 23 is attached to the main body 1, so when the lid 2 is opened, both shafts 22 and 23 are attached. The cents of the sheet material 5 can be easily made widely apart.

Next, when the recording start signal is input with the lid body 2 closed,
The motor 20 rotates normally, the platen roller 6a rotates in the direction of arrow d, and the sheet material 5 is conveyed in the direction of arrow e. In synchronization with this conveyance, the heating element 6b+ of the recording head 6b selectively generates heat to perform predetermined recording on the sheet material 5. Then, when the sheet material 5 is conveyed, the decurling mechanism A operates to correct the curl of the sheet material 5.

That is, - the forward rotation driving force of the motor 20 is transferred to the clutch gear 29.
However, as described above, the spring clutch 30 is in a free state and the clutch gear 29 is rotating idly with respect to the clutch flange 28.

On the other hand, as shown in FIG. 7, a biasing force in the direction of arrow r is acting on the shaft 25 due to the tensile force of the tension spring 35.
The arm 26 rotates in the direction of the arrow
3 moves and stops at a position balanced with the tension of the sheet material 5.

Thereby, the conveyance path of the sheet material 5 is the sheet roll 5a,
It wraps around the guide shaft 23 in the curling direction, then bends at the decal shaft 22 and curls around the guide shaft 23.
It wraps around the curl in the opposite direction.

This winding around the decal shaft 22 corrects the curl of the sheet material 5.

Here, the tension applied to the conveyed sheet material 5 is caused by the contact friction between the roll holder 4 and the roll 5a loaded on this holder 4.

That is, as shown in FIG. 5, if the weight of the roll 5a is G and the tension acting on the sheet material 5 is F, then the sheet material 5 is
The arm 26 stops at a position where the tension F generated in the rotational force of the arm 26 (the rotational torque of the pulley 33 due to the tensile force of the tension spring 35) is balanced.

As shown in FIG. 5, when the roll diameter is large, the wrapping angle at which the sheet material 5 wraps around the decal shaft 22 is θ1 when the tension F on the sheet material 5 and the rotational force of the arm 26 are balanced. Then the platen roller 6a
guided by.

On the other hand, as the diameter of the roll 5a decreases as shown in FIG. 6, the roll weight IGg also decreases (cz<cu, and the tension F2 acting on the sheet material 5 also decreases (Pz<F
l). Therefore, the arm 26 rotates further in the direction indicated by the arrow - than when the roll diameter is large. When the rotational force of the arm 26 and the above-mentioned drag are balanced, the arm 26 stops at that position, but when the rotational sewing of the arm 26 is greater, it stops at the position where it abuts against the stopper 36. At this time, the wrapping angle at which the sheet material 5 is wound around the decal shaft 22 is θ2, which is smaller than the wrapping angle θ1 when the roll diameter is large.

Therefore, when the diameter of the roll 5a is large, the amount of wrapping ffl of the sheet I/material around the decal shaft 22 is small, and as the roll diameter becomes smaller and the curl becomes stronger, the amount of wrapping increases. As the amount of wrapping increases, the sheet material 5 is bent in the direction opposite to the curl, so that the curl correction effect increases. That is, the curl correction effect increases as the roll diameter, which causes stronger curling, becomes smaller.

Here, the results of an experiment in which sheet materials 5 of various roll diameters were conveyed by the decurling mechanism A and curls were corrected will be shown.

The sheet material 5 used in this experiment has a width of 210 mm (A4
size), 1 inch (25 mm) of thermal recording paper with a length of 100 m
, 4+111) sheet roll 5 wound around the winding core 5b.
A was used. In this case, when the sheet is not used, roll 5
The diameter of a was 96m+m. In addition, the tension spring 35 is set so that the rotational force of the arm 26 is 1 kgc+++,
The decal shaft 22 used had a diameter of 4, and the movement radius of the guide shaft 23 was 13 degrees. Furthermore, the sheet material 5 is configured so that the range of the winding angle θ at which the sheet material 5 is wound around the decal shaft 22 is 130 to 30 degrees, and the sheet material 5 is
97 mm (length of A4 size) was transported and the results were checked.

The experimental results were as shown in FIG. In Figure 9, the white triangles indicate the curl shape shown in Figure 4 (a) without curl correction, and the black triangles indicate the curl shape shown in Figure 4 (a) without curl correction. (b). In addition, the white circles are those that have been curled by the decal mechanism A, and the curled state is shown in Figure 4 (
a).

As is clear from this result, the curl height h of the sheet material 5 decreases as the diameter of the roll 5a increases, and the value of the curl height h increases as the roll diameter decreases. When the roll diameter becomes less than about 40 mm, curling occurs.

On the other hand, the sheet material 5 decurled by the decurling mechanism A of the embodiment described above has almost no curling.
Moreover, the measured curl height h showed a substantially constant value.

In this manner, the decurling structure A changes the decurling effect depending on the strength of the curl due to the balance between the tension acting on the sheet material 5 and the rotational force of the arm 26, and corrects the curl appropriately.

Further, the arm 26 is biased by a tension spring 35, and the rotational force in the direction of the motor 20c is applied to the platen roller 6.
a, but not the arm 26. Therefore, since no load is applied to the motor 20 during recording to move the arm 26, the conveyance accuracy is increased and high-quality recording can be performed.

In addition, within the range of the above experiment, the winding angle θ of the sheet material 5 and the diameter of the guide shaft 23 were kept constant, and the diameter d of the decal shaft 22 was changed to record the curl of the sheet material 5. The relationship between the height h and the height h is shown in FIG.

The curl height h of the sheet material 5 is the height at which the sheet material 5 rises when cut into a predetermined length and placed on a horizontal surface, as shown in FIG. 4(a).

Also, the diameter of the guide shaft 23 is kept constant at 61n11, and the diameter d of the decal shaft 22 is 3m11, 4m.
Three types of m5m were used.

According to FIG. 10, as mentioned above, the larger the diameter of the roll 5a, the smaller the curl height h of the sheet material 5, and the smaller the roll diameter, the larger the curl height h. I understand.

Furthermore, it can be seen that the smaller the diameter d of the decal shaft 22 is for the same roll diameter, the smaller the value of the curl height h, and therefore the greater the curl removal effect.

In the above embodiment, the radius of curvature of the guide shaft 23 is configured to be larger than the radius of curvature of the decal shaft 22, but the value of the radius of curvature is not limited to the above numerical value, and the difference in the values of the radius of curvature is The larger the size, the more effective the curl removal effect can be.

Further, the larger the radius of curvature of the guide shaft 23, the smaller the curvature, and the less bending of the sheet material 5, so that stable conveyance can be performed without causing wrinkles, skewing, etc.

After an image is recorded on the sheet material 5 whose curls have been corrected as described above, the sheet material 5 is cut by a cutter 7 and discharged by a discharge roller 8.

On the other hand, the tip of the sheet material 5 in the device is cut into a cutter 7.
It is transported backward by a distance l from the position to the recording means 6. This is to prevent a blank area from appearing at the leading edge of the sheet during the next recording. Therefore, when the motor 20 is driven reversely by a predetermined amount, the driving force is transmitted not only to the platen roller 6a but also to the clutch flange 28 with the spring flange 30 in the long state as described above, and a force that rotates the arm 26 in the direction indicated by the arrow. acts.

At this time, as shown in FIG. 7, a tension force is applied to the arm 26 by a tension spring 35 in a direction that prevents the rotation. For this reason, the driving force of the motor 20 in this embodiment is set to be larger than the arm rotation force caused by the tension force of the tension spring 35 when driving in reverse as described above.

Therefore, when the motor 20 is driven in reverse to reversely feed the sheet material 5 as described above, the driving force causes the arm 26 to
rotates in the direction indicated by the arrow, moves away from the sheet material 5, and returns to the initial position shown by the two-dot chain line in FIG. Note that the initial position here refers to a position where the guide shaft 23 does not block the opening of the roll holder 4, and where the guide shaft 23 does not interfere with the decal shaft 22 when opening the lid body 2. . In this state, the guide shaft 23
is separated from the sheet material 5, the sheet material 5 will not be curled in the opposite direction even if the recording standby state continues for a long time.

Incidentally, in order to reversely feed the sheet material 5 by a distance l, the motor 2
When 0 is driven in reverse, the arm 26 rotates! (Return angle α) is set to an angle at which the arm 26 rotates from the position where it contacts the stopper 36 to the initial position as shown in FIG.

That is, the motor 2 when rewinding the sheet material 5 by length 2
The distance 2 between the platen roller 6a and the cantilever 7, and the distance between the platen roller 6a and the shaft 25 are set so that the amount of rotation of the motor 20 when rotating the arm 26 by the angle α in the direction indicated by the arrow is the same. The rotation ratio, the position of the stopper 36, etc. are set.

Next, the motor driving force required to operate each member will be explained when the motor 20 is driven in forward rotation and when it is driven in reverse.

If the motor output when driving the motor 20 in normal rotation (when conveying the sheet material 5 in the recording direction) is Pl, in this case, since the spring clutch 30 is in a free state,
The output P may be the driving force necessary to rotate the platen roller 6a.

On the other hand, if the motor output when driving the motor 20 in the reverse direction (when conveying the sheet material 5 in the rewinding direction) is set to P2, the spring clutch 30 is in a locked state in this case, so the output P2 is The driving force necessary to rotate the roller 6a and the driving force necessary to rotate the arm 26 against the tension spring 35 are required, and the driving force (P, < p,) is required.

Therefore, if the rated output of the motor 20 is set to P2, when the motor 20 is driven in normal rotation to convey the sheet material 5 in the recording direction, the surplus output of the motor 20 (Pz-P
+) may cause vibration, which may cause uneven feeding, noise, etc.

Therefore, in this embodiment, the output when driving the motor 20 in the normal rotation is set to P1, and when driving the motor 20 in the reverse rotation, the output is set to P2, which is larger than that when driving the motor 20 in the normal rotation. This can be easily accomplished by a known method such as increasing the driving current of the motor 20 during reverse rotation compared to normal rotation, or lowering the rotation speed.

As mentioned above, even if the drive current is increased or the rotational speed is set low during reverse drive, the rewind lff1 (for example, about 201II11) is ) is sufficiently small, the influence of the temperature rise of the motor 20 during reverse drive or the delay in the reverse feeding time of the sheet material 5 is extremely small.

Also, an arm 2G driven by the motor 20
It is preferable to set the gear ratio and the like so that the rotational speed of the platen roller 6a is the same as or slightly faster than the rotational peripheral speed of the platen roller 6a (the conveyance speed of the sheet material 5). That is, by configuring as described above, the guide shaft 23 quickly retreats to the initial position when the sheet material 5 is fed back.

The motor 20 stops after rewinding the sheet material 5 a predetermined number of times, but at this time the arm 26 is in a tensioned state by the tension spring 35.

As shown in FIG. 7, this tensile force is caused by the spring clutch 30 trying to rotate the boot IJ33 in the direction of arrow f.
becomes a locked state and becomes a force that urges the clutch gear 29 in the direction of arrow a, which acts as a rotational torque that rotates the motor 20 via the gears 21a to 21d.

For example, if the rotational torque for rotating the pulley 33 in the direction of arrow f is TI (for example, about 1 kgcm), and the rotational speed ratio of the motor 20 and clutch gear 29 is IO:1, the rotational force causes the motor 2o to The transmitted rotational torque T2 is TI/10 (0.1 kgcm).

Therefore, in this embodiment, in order to prevent the arm 26 from rotating when the motor 20 is stopped, the self-holding torque of the motor 20 (when external torque is applied to the rotor made of a permanent magnet, the magnetic force The rotational torque T2 transmitted to the motor 20 (for example, 0.2kgc+w)
) has been set.

As a result, in the recording apparatus of this embodiment, the arm 26 is held at the initial position indicated by the two-dot chain line in FIGS. 5 and 6 in the recording standby state.

Therefore, when opening the lid 2, such as when replacing the roll 5a, the guide shaft 23 does not interfere with the decal shaft 22, and the lid 2 can be opened smoothly.

Since the device of this embodiment is configured as described above, it is possible to correct the curl according to the strength of the curl, and the load applied to the motor 20 during recording is only the load for rotating the platen roller 6a. Because of this, the sheet te is accurately fed, and furthermore, the roll 5a can be easily replaced.

[Second example]

In the first embodiment described above, an example was shown in which the guide shaft 23 was movable with respect to the decal shaft 22, but as a second embodiment, an embodiment in which the decal shaft 22 was configured to be movable is shown in FIG. .

Incidentally, the same parts and parts having the same functions as those in the first embodiment are given the same reference numerals, and the explanation thereof will be omitted.

In FIG. 10, the guide shaft 23 is rotatably attached to the support member 38 of the main body 1 of the apparatus.

On the other hand, the decal shaft 22 is rotatably attached to an arm 40 fixed to a shaft 39 rotatably attached to the lid body 2, and the curl of the sheet material 5 is corrected by rotation of the arm 40 in the direction of arrow g. However, the correction is canceled by rotation in the -g direction.

A clutch gear 42 to which an electromagnetic clutch 4I is fixed is rotatably provided at one end of the shaft 39. The electromagnetic clutch 41 transmits or releases the rotational force of the clutch gear 42 to the shaft 39 in response to a signal from a control section (not shown). and the clutch gear 4
A gear 44 fixed to a motor 43 is meshed with the clutch gear 2, so that the driving force of the motor 43 is transmitted to the clutch gear 42.

Also, a pulley 4 is provided at the other end of the three shafts as in the first embodiment.
5 is fixed, and a protrusion provided on the circumferential surface of the boob and a rank 46 protruding from a predetermined position of the lid body 2.
A tension spring 47 is attached between them, and the action of the spring 47 constantly biases the arm 40 in the direction of arrow g.

In the above configuration, the electromagnetic clutch 41 is activated during recording standby.
is in the on state, and the arm 40 is held at the position indicated by the two-dot chain line in FIG. 10 by the self-holding force of the motor 43. Therefore, when opening the lid body 2, the decal shaft 22 and the guide shaft 23 do not interfere with each other, and the roll 5a
can be easily replaced.

During recording, the lid 2 is closed, the motor 20 is driven to rotate the platen roller 6a, and the sheet material 5 is conveyed in the direction of arrow g, and the recording head 6b is driven in accordance with the image signal. to form an image. At this time, when the electromagnetic flange 41 is turned off at the same time as the motor 2o is driven, the arm 40 rotates in the direction of the arrow g due to the tensile force of the tension spring 47, and the decal shaft 22 moves as shown by the solid line in FIG. It comes into contact with the sheet material 5. The moving position of this decal shirt 1-22 is a position where the biasing force of the tension spring 47 and the tension of the sheet material 5 are balanced, as in the first embodiment, and the sheet material 5 is moved by the decal shaft 22 in a direction opposite to the curling direction. The curl is corrected by bending it.

When recording is completed, the motor 20 is driven in reverse to remove the tip of the notebook material 5 from the cutter 7 to the platen roller 6a.
Reverse feed to the position. At this time, the electromagnetic flanch 4 is turned on, and the motor 43 is driven in the reverse direction by a predetermined amount to rotate the arm 40 in the direction of arrow -g. The amount of rotation α of this arm is the same as in the first embodiment. This allows sheet 4
0 returns to the position indicated by the two-dot chain line in FIG. 10 and is held at that position.

Even if the decal shaft 22 is made movable as described above,
The same effects as in the first embodiment can be obtained.

[Other Examples]

In the first embodiment described above, the guide shaft 23 and the decal shaft 22 in the second embodiment are respectively attached to arms, and are configured to be moved by rotating the arms, but the moving means is limited to this. For example, the guide shaft 23 or decal shaft 22 may be configured to move in parallel along a rack or rail, or may be moved by being pushed up by a cam or the like.

Further, both the decal shaft 22 and the guide shaft 23 may be configured to be movable by combining the first embodiment and the second embodiment.

Further, the cylindrical decal shaft 22. Instead of the guide shaft 23, a plate-like member such as a sheet metal having a curved surface having the same radius of curvature as that of each soyaft may be used.

Further, as a device for selectively transmitting the driving force of the motor to the decal shaft 22 or the guide shaft 23,
Although the spring clutch 30 was used in the first embodiment and the electromagnetic clutch notch 41 was used in the second embodiment, the present invention is not limited to these, and for example, a roller type needle clutch or the like may be used.

Further, in the first embodiment, the motor 20 that drives the platen roller 6a is used as a drive source for moving the guide shaft 23, but it is natural that these may be driven by separate motors. Furthermore, the driving source need not be limited to a motor; for example, a plunger can be used.

Furthermore, although a tension spring was used in the above-described embodiment as a biasing means for biasing the decal shaft 22 or guide shaft 23 in a direction that increases the decal effect, the present invention is not limited to this. In addition to springs such as coil springs, compression springs, and springs, cylinders such as air cylinders and oil cylinders, or magnets may also be used.

Furthermore, although the above-described recording system has been explained by taking as an example a thermal recording device using a heat-sensitive sheet material, the present invention can be similarly applied to a thermal transfer recording device that transfers ink from an ink sheet to plain paper.

<Effects of the Invention> As described above, in the present invention, the guide member or the decal member is configured to be movable by the interaction between the tension acting on the sheet material and the moving force applied to the guide member or the decal member. Curl correction can be performed depending on the degree of curl of the sheet.

In addition, by making the radius of curvature of the curved surface of the guide member larger than the radius of curvature of the curved surface of the decal member, the wrapping of the sheet material around the decal member can perform stronger curl correction without making the corners unnecessarily large. I can do it.

In addition, IJ by wrapping the sheet material around the guide member.
), the conveyance route can be simplified, the device can be made smaller, and the occurrence of jams can be reduced.

Furthermore, since the decal member or the guide member is biased by the biasing means, unnecessary load can be prevented from being applied to the drive source of the sheet conveying means, and sheet conveyance accuracy can be improved. In addition, it has features such as being able to reduce the cost by downsizing the drive source.

[Brief explanation of drawings]

1 and 2 are perspective explanatory views of a first embodiment in which the present invention is applied to a recording system of a facsimile apparatus, FIG. 3 is an overall sectional view of a facsimile apparatus, and FIG. An explanatory diagram of curling. Figure 5 is an explanatory diagram of a state in which recording is performed with a large diameter sheet roll loaded. Figure 6 is an explanatory diagram of a state in which recording is performed with a small diameter sheet roll. Figures 7 and 8 are an illustration of the decurling mechanism. 9 is an explanatory diagram showing the roll diameter and the degree of curl, FIG. 10 is an explanatory diagram showing the roll diameter and the degree of curl when the radius of curvature of the decal member is changed, and FIG. 11 is an explanatory diagram showing the roll diameter and the degree of curl. The explanatory diagrams of the two embodiments and FIGS. 12 to 16 are explanatory diagrams of the prior art. A is decal a structure, B is recording system, C is document reading system,
1 is the device body, 2 is the lid, 3 is the shaft, 4 is the roll holder, 5 is the sheet material, 5a is the sheet roll, 5b is the core, 6
8 is a recording means, 6a is a platen roller, 6b is a recording head, 6b is a heating element, 6c is a shaft, 6d is a compression spring, 7 is a cutter 17a is a fixed blade, 7b is a driving blade, 7C is a shaft, 8
is a discharge roller, 9 is a stacker, 10 is a document placement table, 11
is a document, 12a is a pre** feed roller, 12b is a pressure contact member,
13a is a minute mark, 13b is a pressure contact member, 14a, 14
b, 15a. 15b is a conveyance roller, 16 is a light source, 17 is a mirror, 18
is a lens, 19 is a photoelectric conversion element, 20 is a motor, 21
a to 21d are gears, 22 is a decal shaft, 23 is a guide shaft, 24 is a mounting member, 24a is a flat plate, 24b
is a bracket, 25 is a shaft, 26 is an arm, 27 is a bearing,
28 is a clutch flange, 28a is a cylindrical part, 28b is a collar part, 29 is a clutch gear, 29a is a cylindrical part, 29b is a gear part, 30 is a spring clutch, 31.32 is a rotation pin, 3
3 is a pulley, 33a is a groove, 34a and 34b are hooks, 3
5 is a tension spring, 36 is a stopper, 37 is a guide, 38
39 is a support member, 39 is a shaft, 40 is an arm, 41 is an electromagnetic clutch, 42 is a clutch gear, 43 is a motor, 44 is a gear, 45 is a pulley, 46 is a hook, and 47 is a tension spring.

Claims (7)

[Claims] (1) a conveying means for conveying the sheet material; a decal member having a curved surface for bending and guiding the conveyed sheet material; a guide member having a curved surface with a large radius of curvature; a moving means for moving at least one of the guide member and the decal member; and an urging member for urging the moving means in a direction in which the bending of the sheet material is increased. a decal mechanism comprising: a force means; and a decal mechanism. (2) The decurling mechanism according to claim 1, wherein the device main body and the lid are configured to be openable and closable, the decal member is provided on the lid, and a guide member is provided on the device main body. (3) The decurling mechanism according to claim 1, wherein the self-holding force of the drive source for operating the moving means is set to be larger than the urging force applied to the moving means by the urging means. (4) The decurling mechanism according to claim 1, wherein the moving force of the moving means is set to be larger than the urging force of the urging means of the moving means. (5) A recording device comprising: the decurling mechanism according to claim (1); and recording means for recording an image on a sheet material conveyed by the conveyance means. (6) A cutter is provided downstream of the recording means in the sheet material conveying direction, and a driving source for the conveying means for conveying the sheet material and a driving source for operating the moving means are configured to be the same. , The amount of rotation of the drive source required to reverse feed the sheet material from the cutter to the recording means is set to be approximately the same as the amount of rotation of the drive source required to return the moving means to the initial position. The recording device according to claim (5). (7) In the case where the drive source for the conveyance means for conveying the sheet material and the drive source for operating the moving means are configured to be the same, and the output of the drive source is used to convey the sheet material in the recording direction. 6. The recording apparatus according to claim 5, wherein the conveyance in the opposite direction to the recording direction is set to be larger than that in the recording direction.