JPH09165126A - Roll paper feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the jam to be generated caused by the slack of a roll paper and damage of the roll paper when the roll paper is automatically drawn out and nipped by conveying rollers. SOLUTION: Many guide rolls 26a are provided on a guide sheet 26 for partially covering a roll paper 100. A shaft 27b fixed on one end of the guide sheet 26 can be moved in a guide groove 30 provided on the side surface of a frame body 24. The other end 27a of the guide sheet 26 is fixed to the frame body 24 through a tension spring 28a. When a paper feeding cassette 21 is mounted on a main body frame, a locking plate on the main body frame side moves the shaft 27b to one end of the guide groove 30. As a result, the guide sheet 26 is wound on the roll paper 100 and pressed the front surface of the roll paper 100, and therefore, the slack of the roll paper 100 is prevented. The tip of the roll paper 100 is caught by a peeling pawl 32 and separated from the lower layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll paper feeding device used in an image recording apparatus such as a printer, a copying machine, or a facsimile device, and more particularly, to automatically feed the leading end of the roll paper from the roll paper main body. The present invention relates to a roll paper feeding device that is peeled off and pulled out in a transport path direction.

[0002]

2. Description of the Related Art Conventionally, particularly in an image recording apparatus for recording a large size image as shown in the drawings, a recording paper wound on a roll, that is, a roll paper may be used. In this case, pull out the roll paper from the paper feeding device that contains the roll paper in advance, cut it according to the recording size,
Supply to the image recording unit. For example, JP-A-6-14465
Japanese Unexamined Patent Publication No. 9 describes a paper feeding device that pulls out roll paper semi-automatically to a position (nip position) where it is sandwiched by feed rollers.

By the way, since the roll paper is wound in layers, the layers are in close contact with each other due to the curling and static electricity. Therefore, after the roll paper is accommodated in the predetermined position of the paper feed cassette, it is necessary to separate the leading end of the roll paper from the layer immediately below it and sandwich it between the feed rollers. Up to now, the peeling of the leading end of the roll paper has been performed manually, and it has been demanded to realize an apparatus capable of automatically performing this peeling.

[0004]

When attempting to automate the work of separating the leading end of the roll paper and sandwiching it between the feed rollers, there are the following problems. When peeling the roll paper tip from the rolled state, the position of the roll paper tip is indefinite, and the following procedure may be considered. First, the claw-like body for peeling off the tip is brought into contact with the surface of the roll paper. In this state, the roll paper is rotated in the rotation direction when the paper is fed, that is, in the forward direction. By doing so, when the leading end of the roll paper reaches the claw-shaped body position, it is caught by the claw-shaped body and peeled off.

However, there is a problem in that the roll paper may be naturally peeled off before it reaches the position of the claw-shaped body, and in this case, the roll paper is loosened to cause a paper jam.

The present invention solves the above problems, eliminates the risk of paper jams, and separates the leading edge of the roll paper from the roll paper body to automatically guide it to the feed roller position. An object is to provide a paper feeding device.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems and achieve the object, the present invention provides a spindle which is fitted in the center of a roll paper and whose both ends are rotatably supported by a paper feed cassette. Drive means for rotating the spindle for rotating the roll paper, a guide sheet for covering a part of the circumference of the roll paper supported by the spindle, and guide grooves formed on both side walls of the paper feed cassette A shaft fixed to one end of the guide sheet and supported at both ends in the guide groove; spring means for applying a tension to the guide sheet in the rotation direction of the roll paper; And a locking plate that abuts the shaft and moves the shaft in the guide groove when the paper cassette is inserted into the main body frame, the guide groove being formed by the main body of the paper cassette. The shaft is pushed by the locking plate to move when it is stored in the expected position of the ram, and as a result, the guide sheet is part of the circumference of the roll paper under the tension of the spring means. The first feature is that the shape is determined so as to cover the. According to this first feature, when the paper feed cassette is mounted on the main body frame, the guide sheet wraps a part of the roll paper, so that when the roll paper is rotated, the surface layer of the roll paper is It is possible to prevent loosening away from the lower layer.

A second feature of the present invention is that a roller group that is rollable in the rotation direction of the roll paper is arranged in at least a range of the guide sheet that is in contact with the roll paper. According to this second feature, the action of preventing the roller group from rolling in contact with the roll paper and separating the surface layer of the roll paper from the lower layer thereof is further ensured.

Further, according to the present invention, a supporting means for rotatably supporting the roll paper with respect to the paper feed cassette, a drive roller,
A belt device including an idle roller whose shaft position is fixed, a moving idle roller whose shaft position is not fixed, a tension roller, and a belt wound around each of these rollers; The guide groove formed on both side walls of the paper cassette, the shaft of the movable idle roller whose both ends are supported by the guide groove, and the tension roller are tensioned from the inner peripheral surface to the outer peripheral surface of the belt device. And a locking plate provided on the main body frame, which comes into contact with the shaft of the movable idle roller and moves the shaft in the guide groove when the paper feed cassette is inserted into the main body frame. The guide groove is configured such that the shaft of the movable idle roller is pushed by the locking plate when the paper feed cassette is stored at the predetermined position of the main body frame. A third feature is that the shape is determined so that the outer peripheral surface of the belt device covers a part of the circumference of the roll paper in a state where the belt device moves and as a result, the tension of the spring means acts. . According to the third feature, when the paper feed cassette is mounted on the main body frame, a part of the roll paper is wrapped in the surface of the belt device, and the roll paper is rotated by the belt device as it is. It is possible to prevent the surface layer of the roll paper from coming loose from the lower layer.

Further, the present invention has a fourth characteristic in that a peeling claw that is pressed by a constant force is provided on the surface of the roll paper in order to peel the tip of the roll paper from the roll paper main body. The point that means for detecting that the leading edge of the roll paper has peeled from its lower layer, and means for releasing the pressing of the peeling claw after detecting that the roll paper tip has peeled from the lower layer are provided. There are 5 characteristics. According to the fourth and fifth characteristics, when the roll paper is rotated and the tip thereof reaches the position of the peeling claw, the peeling claw is caught by the tip of the roll paper and the surface layer of the roll paper is peeled from the lower layer. It Particularly, according to the fifth feature, after the leading edge of the roll paper is peeled from the lower layer, the pressing of the peeling claw on the roll paper surface is released.

Further, the present invention comprises a reversing means for reversing the rotation direction of the roll paper by the driving means for winding the roll paper, and after supplying the roll paper by an amount necessary for image recording, the reversal A sixth characteristic is that the rotation direction of the roll paper is reversed by the means.
According to the sixth feature, after the required amount of the roll paper is supplied, the front end of the roll paper is wound around the roll paper main body side.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings. FIG. 5 is a perspective view showing the outer appearance of a printer device according to an embodiment of the present invention. The printer device incorporates the roll paper supply device of the present invention. In FIG. 1, the printer device 1 includes a main body 10 and a roll paper feeding device 20 provided below the main body 10. An operation panel 11 and a display 12 are provided on the upper surface of the main body 10. The operation panel 11 is provided with switches for instructing an operation, and the display 12 is adapted to display the size of the roll paper currently in use, the remaining amount of the roll paper, and the operation state such as paper jam occurrence. For example, CRT or LC
D.

The roll paper feeding device 20 includes handles 21a, 2
It is equipped with drawer type paper feed cassettes 21, 22 and 23 that can be pulled out using 2a and 23a. Roll papers of different sizes may be housed in the respective paper feed cassettes, or roll papers of the same size for backup may be housed in the respective paper feed cassettes. Further, the number of paper feed cassettes is not limited to three, and more or less paper feed cassettes may be used.

FIG. 6 is a diagram showing a schematic configuration of the inside of the printer device 1. A photoconductor drum 41 as an image carrier is arranged in the printer device 1 and is rotatable in the direction of an arrow 41a in the drawing. The surface of the photosensitive drum 41 is uniformly charged by the charging corotron 42, and the information to be printed is electrostatically written on the surface of the photosensitive drum 41 by the writing device 43. The latent image of the information written by the writing device 43 is visualized as a toner image by the developing device 44. The toner image obtained by the developing device 44 is transferred by the transfer corotron 45 to the recording paper supplied from the roll paper feeding device 20 or the manual paper insertion port 51, which will be described in detail later. The recording paper is supplied between the pressure roller 50a and the heating roller 50b of the fixing device 50 by the conveyor belt 49 to thermally fix the toner image, and then discharged to the outside of the machine. After the toner image is transferred onto the recording paper, the toner remaining on the surface of the photoconductor drum 41 is removed by the cleaning device 47, and the potential on the surface of the photoconductor drum 41 is neutralized by the static elimination lamp 48.

The recording paper inserted from the manual insertion paper insertion port 48 is sent out to the transfer path 53 by the transfer roller 52, and is further transferred to the transfer position by the transfer roller 54 arranged downstream.

On the other hand, the roll paper 100, which is rotatably supported by the spindle 103, is accommodated in the roll paper feeder 20. FIG. 6 shows a state in which the leading end of the roll paper 100 is pulled out to the nip position by the feed roller 104. A cutter unit 105 is arranged downstream of the feed roller 104, and the roll paper 100 is
Is further drawn to the conveyance path 107 by the feed roller 104. When the pull-out length is pulled out to a predetermined length, that is, a size corresponding to the information to be printed, the cutter unit 105 operates and the roll paper 100 is cut,
The recording paper of the planned size is supplied to the transfer position.

The roll paper 100 and the feed roller 10
4 and the cutter unit 105 are provided in three sets as shown in the drawing.
1, 22, 23 are configured. Further, in a state where all the sheet feeding cassettes 21 to 23 are set, a transport path 107 extending from the lower side to the printer body 10 is formed.

Next, the paper feed cassettes 21 to 23 will be described in more detail. Note that the paper feed cassettes 21 to 23
Can be configured in almost the same manner, and therefore, the paper feed cassette 21 will be described as a representative of others. 1 is a side sectional view showing the structure of the paper feeding cassette 21, FIG. 2 is a plan sectional view of the same, and FIG. 3 is a locking plate provided on the main body frame of the paper feeding cassette 21 and the roll paper feeding device 20. 3 is a diagram showing a positional relationship between the sheet feeding cassette 21 and the sheet feeding cassette 21. FIG. Incidentally, in FIG.
The plate member and the carrying roller arranged in the carrying path 107 are not shown in the figure because they are not the main part of the present invention.

In FIGS. 1 and 2, the roll paper 100 is used.
A spindle 103 is fitted in the center of the spindle 103, and the spindle 103 is supported by support plates 24a and 24b fixed to the inside of the frame 24 of the paper feed cassette 21. A gear 25 is integrally attached to the spindle 103, and the spindle 103 is attached to the support plate 2
The positions are determined so as to mesh with a drive gear (not shown) driven by a motor fixed to the frame body 24 in a state of being set to 4a and 24b. The spindle 103 is normally rotated by the motor (not shown).

A guide sheet 26 is arranged at the bottom of the frame 24 of the paper feed cassette 21. The guide sheet 26 is provided with a guide roller 26a rotatably in the rotation direction of the roll paper 100. Details of the guide roller 26a will be described later with reference to FIG. The guide sheet 26 has the shaft 2 at both ends thereof.
7a and 27b, and one ends of tension springs 28a and 28b are fixed to the shaft 27a. The other ends of the tension springs 28a and 28b are fixed to a pin 29 provided upright on the frame body 24. That is, the guide sheet 26
A tensile force acts on the roll paper 100 in the pull-out direction.

On the other hand, the shaft 27b is the shaft 27
It is longer than a, and both ends thereof penetrate guide grooves 30 provided in the frame body 24 and project to both sides of the paper feed cassette 21. Therefore, the shaft 27b is movable in the guide groove 30 between the positions P1 and P2. A locking plate 31 is fixed to the inner surface of the roll paper feeding device 20,
The fixing position of the locking plate 31 is such that both ends of the shaft 27b come into contact with the vertical end surface of the locking plate 31 when the paper feeding cassette 21 is inserted into the main body frame 20a of the roll paper feeding device 20. Has been decided.

In FIGS. 1 and 2, the roll paper feeding device 2 is shown.
It shows a state in which the paper feed cassette 21 is pushed to the planned innermost position of 0. In this state,
The shaft 27b is pushed by the locking plate 31 to move to the position P2.
It has been sent to almost near. As a result, the guide sheet 26 is wrapped around the roll paper 100, and the guide roller 26
The a is pressed against the surface of the roll paper 100 by the tension of the tension springs 17a and 17b. In this state, when the spindle 103 rotates in the forward direction, the roll paper 100
Since the surface of the roll rotates while being pressed by the guide roller 26a, even a roll paper with a weak curl does not loosen at the portion in contact with the guide roller 26a.

According to FIG. 3, the paper feed cassette 21 and the locking plate 3
The positional relationship of 1 will be described. The paper feed cassette 21 is inserted into the main body frame 20a of the roll paper feed device 20 (FIG. 3A), and when it is further inserted (FIG. 3A).
(B)), the locking plate 31 contacts the shaft 27b. Then, when the paper feed cassette 21 is further pushed in from there, the shaft 27b moves substantially at the end of the guide groove 30 (position P2).
Can be sent to. In this state, the mounting of the paper feed cassette 21 is completed.

Next, referring to FIG. 4, the guide roller 26
The fixing of a will be described. The guide roller 26a has a shaft 2
6b is inserted and is rotatable about the shaft 26b. Then, the shaft 26b is fixed on the guide sheet 26 by an appropriate joining method. In the fixed state,
The guide roller 26a penetrates a rectangular slot 26c provided in the guide sheet 26. As the joining method, an appropriate fixing method such as welding, adhesion, and lashing can be adopted depending on the material of the shaft 26b and the guide sheet 26. FIG.
Shows an example in which the adhesive 26d is used for adhesion.

The guide roller 26a is preferably made of resin and the shaft 26b is preferably made of metal. The guide sheet 26 is preferably made of leather or cloth, but is not limited to this and may be made of a durable and flexible material such as a thin metal plate, a resin sheet, or a composite material thereof.

Returning to FIG. 1 again, the peeling means at the tip of the roll paper will be described. The paper feed cassette 21 is provided with a peeling claw 32 capable of sliding on the surface of the roll paper 100 as a peeling means for the leading end of the roll paper, and a suitable peeling claw 32 so that the peeling claw 32 is not pressed against the surface of the roll paper 100 too strongly. A tracking roller 109 for holding the position is provided. It is fixed to an arm 33 that supports the peeling claw 32 and the tracking roller 109. The arm 33 is attached to the frame body 24 of the paper feed cassette 21 via guide means (not shown) so that the arm 33 can move back and forth in the direction of the spindle 103, that is, in the radial direction of the roll paper 100. Well-known means such as a linear motion bearing can be applied to the guide means. Further, a motor 110 for moving the arm 33 forward and backward and a pinion 111 driven by the power transmitted from the motor 110 by a belt or the like are provided.
The pinion 111 is positioned so as to mesh with the rack 112 on the arm 33. Of course, the motor 110
May be directly connected to the pinion 111. In addition,
The motor 110 includes a torque limiter mechanism, and the motor 11
When a torque larger than a certain value acts on 0, slippage occurs, and rotation of the motor 110 with respect to the output shaft is not transmitted.

Guide plates 34 and 35 are provided so that the leading end of the roll paper 100 separated by the separation claw 32 guided by the tracking roller 109 is guided to the feed rollers 104a and 104b. These guide plates 101 and 102 are fixed to the frame body 24 of the paper feed cassette 21. The guide plate 101 has the tracking roll 10
Of course, notches are provided so as not to interfere with 9 and the peeling claw 32 and prevent their movement.

A rotary blade 105a and a fixed blade 105b forming the sensor 116 and the cutter unit 105 are provided downstream of the feed rollers 104a and 104b. Sensor 1
16 is the feed roller 104 at the front end of the roll paper 100.
It is provided in order to monitor whether or not it has passed between a and 104b, and a light reflection type sensor can be used.

The tracking roller 109, etc. in the retracted position, the tracking roller 109, etc., which is in contact with the large-diameter roll paper 100, and the tracking roller 109, which is in contact with the small-diameter roll paper 100a, are respectively indicated by thick dotted lines, solid lines, and It is indicated by a thin dotted line.

The guide sheet 26 wound around the large-diameter roll paper 100, the guide sheet 26 wound around the small-diameter roll paper 100a, and the guide sheet 26 wound around the small-diameter roll paper 100a are indicated by solid lines and
It is indicated by a thin dotted line and a thick dotted line.

Next, the overall operation of the roll paper feeder having the above-mentioned structure will be described with reference to the flow chart. In FIG. 7, first, in step S1, it is determined whether the paper feed cassette 21 is set. That is, it is determined whether the paper feed cassette 21 has been pushed to the position where the guide sheet 26 is wrapped around the roll paper 100. This determination can be made, for example, by providing a limit switch on the inner wall surface of the roll paper feeding device 20 and detecting that the limit switch is pushed by the frame 24 of the paper feeding cassette 21. When it is detected that the paper feed cassette 21 has been pushed to the expected position, the process proceeds to step S2, the motor 110 is rotated forward and the arm 33 is advanced. In step S3, the presence or absence of the roll paper 100 is determined. For example, a limit switch is provided at the stroke end of the arm 33 in the forward direction, and the limit switch is turned on by a predetermined time, that is, by the time required from the position where the arm 33 starts to move forward to the position where the arm 33 contacts the limit switch. Otherwise, it is determined that there is roll paper 100, and if it is detected that the limit switch is on after the scheduled time has passed, roll paper 100 is detected.
You can judge that there is no.

When the paper feed cassette 21 is not set or when it is determined that the roll paper 100 does not exist, "empty cassette" and "no roll paper" are displayed (steps S9 and S10).

If it is determined that the roll paper 100 is present, the process proceeds to step S4, and the spindle 103 is normally rotated. That is, the roll paper 100 is normally rotated. In step S5, the front end of the roll paper 100 is fed by the feed roller 104.
It is determined whether or not the paper has been sent to a position sandwiched between a and 104b. This judgment is made by the sensor 116.
Judgment is made based on whether or not the tip of is detected. Spindle 10
If the sensor 116 does not detect the leading edge of the roll paper 100 even after the lapse of the scheduled time after the start of rotation of No. 3, it is determined that an error in the setting direction of the roll paper 100, a paper jam, or the like has occurred, and the process proceeds to step S11. Display. At the scheduled time, the leading edge of the roll paper 100 is the feed rollers 104a, 1
The time to reach the position of 04b is determined in consideration of at least the time when the roll paper 100 makes one rotation and the distance between the roll paper 100 and the feed rollers 104a and 104b.

If the front end of the roll paper 100 is detected by the sensor 116, the process proceeds to step S6 and the spindle 10
3 and the feed rollers 104a and 104b are stopped. Since it is desirable that the peeling claw 32 is not in contact with the roll paper 100 after the leading edge of the roll paper 100 is normally pulled out, in step S7, the motor 110 is rotated in the reverse direction to retract the arm 33 and the motor 110. To stop. With the above, the setting of the roll paper 100 is completed, and the paper feed command from the main body 10 is awaited. When the setting is completed, "Set completed" is displayed (step S
8).

If the roll paper 100 is left pulled out until the next paper feed command, the roll paper 100 is deformed due to the influence of temperature and humidity and the fact that the roll paper 100 is sandwiched between the feed rollers 104a and 104b for a long time. Deterioration of a recorded image such as a missing image occurs. Therefore, after the roll paper is supplied by an amount required for image recording, that is, after the paper feeding operation, the spindle 103 may be rotated in the reverse direction to rewind the roll paper 100 to the state where the leading end of the roll paper 100 is covered with the guide sheet 26.

By this rewinding, the leading end of the roll paper 100, which is particularly susceptible to the outside air, can be protected by the guide sheet 26, and a certain curl along the diameter of the roll paper 100 can be maintained.

The operation shown in the above flowchart is performed by the spindle 103, the arm 33, the feed roller 104a,
This can be realized by a microcomputer that issues a command to the control device of each motor that drives 104b. The microcomputer includes an interface for receiving detection signals such as the sensor 116, the paper feed cassette 21, and the limit switch for detecting the presence / absence of the roll paper 100, and timer means for time management.

Further, instead of the guide sheet 26 having the guide roller 26a, a sheet having at least a surface friction resistance may be used and the guide roller 26a may be omitted. In order to reduce the frictional resistance on the surface, it is preferable that a cloth or leather sheet is treated with a fluororesin, or the guide sheet itself is made of a fluororesin or a mirror-finished metal.

Next, a second embodiment of the present invention will be described.
In the above-described embodiment, the guide sheet having the guide roller or the slippery surface prevents the slack of the roll paper. In the second embodiment, unlike the guide sheet, the roll paper is wound around a belt having a relatively large frictional resistance, and the belt is driven to rotate the roll paper.

FIG. 8 is a side cross-sectional view of the paper feeding cassette according to the second embodiment, FIG. 9 is a perspective view of the same main portion, and the same reference numerals as those in FIG. 1 denote the same or equivalent portions. 8 and 9, a guide groove 37 for supporting the shaft 36a of the moving idle roller 36 is provided in the frame 24 of the paper feeding cassette 21.
Are formed. The shaft 36 penetrates the guide groove 37, and like the shaft 27b of the guide sheet 26, when the paper feed cassette 21 is mounted on the main body of the roll paper recording apparatus 20, the shaft 36 comes into contact with the locking plate and is guided by the guide groove 37. 37 is moved from one end to the other end.

The shaft 38a of the drive roller 38 has a gear 38b.
Is fixed, and is rotatably supported by a bearing 39 on the side surface of the frame body 24. The gear 38b meshes with the gear 40a of the motor 40 fixed to the frame 24, and the rotation of the motor 40 is transmitted. Shaft 55 of idle roller 55
The a is rotatably supported on the side surface of the frame body 24 by a bearing 56. The shaft 56a is fixed to the frame 24, and the shaft 56a
Alternatively, the idle roller 55 may be rotatably attached. The shaft 57a of the tension roller 57 is a swing arm 58.
The swing arm 58 is rotatably supported by a shaft 58a erected on the frame 24.

Further, the pin 5 is attached to the end of the swing arm 58.
8b is erected, and a tension spring 60 is provided between the pin 58b and the pin 59 erected on the frame 24. That is, the tension spring 60 causes the shaft 5
A tension for rotating the swinging arm 58 clockwise about 8 can be obtained.

A spindle 103 penetrates the roll paper 100 and is supported by the frame 24 as in the example of FIG. However, in the second embodiment, since the roll 103 is not rotated by the spindle 103, the gear 25 and the motor for driving the gear 25 are not provided.

A belt 61 is wound around the moving idle roller 36, the idle roller 55, the tension roller 57, and the drive roller 38. The belt 61 is not limited to being driven by the drive roller 38, but may be the idle roller 55.
May be the driving roller. The spindle 103 of the roll paper 100 is set on the frame 24 so that the roll paper 100 fits in the predetermined position, and the paper feed cassette 21 is inserted into the main body frame of the roll paper feeder 20. The position of each roller is determined so that approximately half of the circumference of the roll paper 100 is in contact with the surface between the moving idle roller 36 and the drive roller 38 among the surfaces.

The paper feeding cassette 21 is the roll paper feeding device 20.
In the state where the tension roller 57 is not inserted in the main body frame, the tension roller 57 is swung clockwise as shown by the dotted line, and the shaft 36a is at the rightmost position in the drawing of the guide groove 37 (indicated by the thick dotted line). ). In this state, the belt 61 is only in slight contact with the outer circumference of the roll paper 100. Then, the paper feeding cassette 21 is used as the roll paper feeding device 2.
When it is inserted into the body frame of No. 0, the shaft 36a is pushed by the locking plate (see reference numerals 24a and 24b in FIG. 2) to guide groove 37.
Move inside and reach the left end in the figure. Then, roll paper 1
The belt 61 is wound around the half circumference of 00.

Roll paper feeder 2 according to the second embodiment
The entire operation of 0 can refer to FIG. 7. However, in steps S4 and S6 of FIG.
Instead of the operation of driving 3 or stopping the spindle 103, the driving roller 38 is changed to be driven or stopped. That is, by driving the belt 61, the roll paper 100 is normally or reversely rotated, and the leading end of the roll paper 100 is fed to the nip position or rewound. The operation of the peeling claw 32 is similar to that already described with reference to FIG.

[0047]

As is apparent from the above description, according to the first to sixth aspects of the invention, the roll paper set in the paper feed cassette has its surface layer separated from the lower layer and the winding slack is reduced. It can be pulled out in the paper feeding direction while preventing it from occurring.

According to claims 4 and 5,
The tip of the roll paper can be peeled off from the lower layer,
The leading edge of the roll paper can be automatically pulled out without performing manual peeling operation of the leading edge.

Further, according to the invention of claim 6, since the leading end of the roll paper is rewound to the main body of the roll paper after the paper feeding operation is completed, the roll front end is influenced by the humidity and the temperature, and the nip of the feed roller is caused. Can be prevented from deformation.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an essential part of a roll paper feeder according to a first embodiment of the present invention.

FIG. 2 is a plan cross-sectional view of a main part of the roll paper feeding device according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram showing a positional relationship between a paper feed cassette and a body frame.

FIG. 4 is a cross-sectional view and a side view showing a mounting state of a guide roller and a guide sheet.

FIG. 5 is an external perspective view of a printer including the roll paper supply device of the present invention.

FIG. 6 is a schematic configuration diagram of the inside of the printer.

FIG. 7 is a flowchart showing the operation of the roll paper feeder.

FIG. 8 is a side sectional view of an essential part of a roll paper feeder according to a second embodiment of the present invention.

FIG. 9 is a cross-sectional perspective view of essential parts of a roll paper feeding device according to a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Printer device, 10 ... Printer main body, 20 ... Roll paper feeding device, 21, 22, 23 ... Paper feeding cassette,
24 ... Feed cassette frame, 25 ... Gear, 26 ... Guide sheet, 26a ... Guide roller, 27b ... Shaft, 28a, 60 ... Tension spring, 30, 37 ... Guide groove, 31 ... Locking plate, 32 ... Peeling Claw, 33 ... Arm,
36 ... Moving idle roller, 38 ... Drive roller,
57 ... tension roller, 58 ... rocking arm, 61
… Belt, 100… Roll paper, 103… Spindle,
109 ... Tracking roller, 110 ... Motor, 1
11 ... Pinion, 112 ... Rack, 116 ... Sensor

Claims (6)

[Claims] 1. A roll paper feeder comprising a main body frame and at least one paper feed cassette accommodated at a predetermined position of the main body frame, the roll paper being fitted in the center of the roll paper and both ends thereof being rotated by the paper feed cassette. A freely supported spindle, a drive means for rotating the spindle to rotate the roll paper, a guide sheet for covering a part of the circumference of the roll paper supported by the spindle, and both sides of the paper feed cassette. A guide groove formed in a wall, a shaft fixed to one end of the guide sheet and having both ends supported by the guide groove, and spring means for applying a tension to the guide sheet in the rotation direction of the roll paper. Provided on the main body frame and abutting the shaft when the paper feed cassette is inserted into the main body frame to move the shaft in the guide groove The guide groove, the shaft is pushed by the locking plate to move when the paper feed cassette is stored at a predetermined position of the main body frame, and as a result, the spring A roll paper feeder, wherein the shape of the guide sheet is determined so as to cover a part of the circumference of the roll paper under the tension of the means. 2. The roll paper feed according to claim 1, wherein a roller group that is rollable in a rotation direction of the roll paper is arranged in at least a range of the guide sheet that is in contact with the roll paper. apparatus. 3. A roll paper feeding device comprising a main body frame and at least one paper feeding cassette housed at a predetermined position of the main body frame, and a supporting means for rotatably supporting the roll paper with respect to the paper feeding cassette. A driving roller, an idle roller having a fixed shaft position, a moving idle roller having a fixed shaft position, a tension roller, and a belt device including a belt wound around these rollers, and a driving device for the belt device. Means, guide grooves formed on both side walls of the paper feed cassette, a shaft of the movable idle roller whose both ends are supported by the guide groove, and an inner peripheral surface to an outer peripheral surface of the belt device with respect to the tension roller. Spring means for applying tension in the direction of, and when a paper feed cassette is inserted into the body frame, the spring means being provided in the body frame. A locking plate that abuts on a shaft of the movable idle roller to move the shaft in the guide groove, the guide groove being provided when the paper feed cassette is stored at a predetermined position of the main body frame, The shaft of the moving idle roller is pushed and moved by the locking plate, and as a result, the outer peripheral surface of the belt device covers a part of the circumference of the roll paper under the tension of the spring means. A roll paper feeder having a shape determined. 4. The peeling claw which is pressed by a constant force on the surface of the roll paper for peeling the front end of the roll paper from the roll paper main body, according to any one of claims 1 to 3. Roll paper feeder described in. 5. A means for detecting that the leading edge of the roll paper has peeled from the lower layer thereof, and a means for releasing the pressing force of the peeling claw after detecting that the tip of the roll paper has peeled off by the detecting means. The roll paper feeder according to any one of claims 1 to 4, further comprising: 6. A reversing means for reversing the rotation direction of the roll paper by the driving means for winding the roll paper, the roll paper being supplied by the reversing means after supplying the roll paper in an amount necessary for image recording. The roll paper feeding device according to any one of claims 1 to 5, wherein the rotation direction of the roll paper is reversed.