JP2000118064A - Printer for rolled paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer for a rolled paper having a rolled paper loading mechanism capable of readily taking out a rolled paper core when replacing the rolled paper. SOLUTION: In a rolled paper loading mechanism 2 of an ink jet printer, a platen roller 26 and a paper guide 27 are displaced between an operating position where they are positioned in an opening section 122F communicated to a side of an ink jet head and a retracting position where they are retracted to a rear side thereof along with an open/close operation of an open/close cover 130. A movable paper guide plate 31 is provided to the opening section 122F at a side of the ink jet head. When the open/close cover 130 is opened and the members 26, 27 are retracted from the opening section 122F, the opening section 122F is closed by the movable paper guide plate 31. As a result, a core 4C of a rolled paper does not roll and drop to a side of the ink jet head from the opening section 122F when a user indents to take out the core 4C, thereby facilitating an operation for taking out the core 4C. It is possible to prevent enlarging of a sag of the rolled paper 4 which may occur when the rolled paper 4 is markedly projected from the opening section 122F to the side of the ink jet head.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll paper printer mounted on a POS terminal or the like. More specifically, the present invention relates to a roll paper printer that facilitates the operation of removing a roll paper residual core from the inside of a roll paper loading unit when replacing roll paper.

[0002]

2. Description of the Related Art POS terminals and the like are generally equipped with a printer for printing on roll paper. For printers that print on roll paper, a roll paper loading mechanism that opens and closes the open / close lid that opens and closes the roll paper loading section formed on the printer body so that the roll paper can be replaced or loaded easily can be installed. Proposed. For example, Japanese Patent Publication No. Hei 6-79855 proposes a recording apparatus having such a roll paper loading mechanism.

In the recording apparatus disclosed here, a platen roller (roll paper feed roller) pressed against the thermal head is also attached to the tip of a cover that functions as an opening / closing lid for a roll paper loading unit. When the cover is closed, the platen roller protrudes toward the thermal head through an opening formed in the roll paper loading unit and is pressed against the thermal head. When the cover is opened, the platen roller is also separated from the thermal head, so that the roll paper unwinding portion can be easily arranged between the platen roller and the thermal head. Further, when the cover is closed, a state in which the roll paper is sandwiched between the thermal head and the platen roller is automatically formed.

[0004] On the other hand, among printers for roll paper, those capable of printing on cut paper as well as roll paper are known, for example, disclosed in Japanese Patent Application Laid-Open No. Hei 5-147284. I have.

[0005]

Here, in a roll paper printer in which a paper guide member such as a platen roller is attached to an open / close lid of a roll paper loading unit, the open / close lid is fully opened for replacement of roll paper. Then, the opening where the paper guide member such as the platen roller is located is also exposed.

In this state, when the roll paper core remaining on the curved bottom surface of the roll paper loading section is scraped up with a finger along the bottom surface, the roll paper core is scraped up along the curved bottom surface. Therefore, there is a possibility that the roller may roll down from the opening toward the print head.

On the other hand, after the roll paper core is taken out and new roll paper is loaded, the roll paper is unwound and loaded via the opening where a paper guide member such as a platen roller is located. A state of being pulled out from the part is formed, and then the opening / closing lid is closed. When the cover is closed, a paper guide member such as a platen roller attached thereto projects from the opening toward the print head.

An ink jet head as a print head,
When a wire dot head is employed, generally, when the roll paper is replaced, the print head is retracted from the above-described opening defining the roll paper print position. For this reason, the roll paper may be pushed out from the opening toward the print head, resulting in a state in which a large slack occurs. Such a slack can be removed by executing the roll paper feeding operation in conjunction with the closing operation of the opening / closing lid. However, if the slack amount is large, the useless amount of roll paper that does not contribute to printing increases, and as a result, the waste of roll paper increases. In addition, the paper feeding operation for removing slack also takes time, and it takes a long time until the printer is ready for printing.

[0009] The object of the present invention is to solve the above problems.
An object of the present invention is to provide a roll paper printer in which a roll paper residual core does not roll down from a roll paper loading unit toward a print head when a roll paper core is taken out.

Another object of the present invention is to provide a roll paper printer that can reduce the amount of roll paper slack generated when replacing roll paper.

[0011]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a roll paper loading section, an opening / closing lid for opening and closing the roll paper loading section, and a printing position regulation attached to the opening / closing lid. A roll paper printer having a roll paper guide member for use in a roll paper and an opening formed in the roll paper loading section for facing the roll paper guide member to a print head. It is characterized by having a guide plate.

[0012] Here, there is further provided a detecting means for detecting that the opening / closing lid is opened, and when the opening / closing lid is detected to be opened by the detecting means, the movable paper guide plate is used to open the opening. It is desirable to close the part.

In the roll paper printer having this configuration, when the opening / closing lid is opened to replace the roll paper, the movable paper guide plate moves, and the opening of the roll paper loading section where the roll paper guide member was located. The part is closed. Therefore, when the roll paper core remaining at the bottom of the roll paper loading section is scraped up with a finger,
The roll paper core does not roll down from the opening toward the print head. Therefore, the work of removing the roll paper core can be easily performed.

Next, the operation of replacing the roll paper may be performed while the power supply of the apparatus is turned off. Therefore, it is desirable that the opening be closed by the movable paper guide plate even when the power supply of the apparatus is turned off.

Further, in order to make it easier to remove the roll paper core remaining at the bottom of the roll paper loading section, a vertical portion for preventing the roll paper core from being rolled is provided at a position upstream of the opening in the roll paper transport direction. It is desirable to form a wall surface.
For example, it is desirable to form such a vertical wall surface continuously to the opening edge of the opening on the upstream side in the roll paper transport direction.

With this configuration, when the roll paper core that is to be scraped up along the bottom surface of the roll paper loading section hits the vertical wall surface, the rolling operation is prevented, so that the finger can be easily pinched.

Here, when such a vertical wall surface is formed, the rolling operation of the roll paper core is prevented by the vertical wall surface, and therefore, before the roll paper core rolls down from the opening to the print head side. Then, the roll paper core can be taken out. Therefore, when such a vertical wall surface is formed, the mechanism for closing the opening by the movable paper guide plate can be omitted.

In this specification, the term "printing" is used as a term synonymous with "printing" and "recording". In other words, it is used as a term that includes not only printing of characters but also printing of other patterns, symbols, and the like. Also, the term "printer for roll paper" means a printer that has a function for printing on roll paper, and does not exclude a printer that prints on both roll paper and cut sheets. Of course.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a printer to which the present invention is applied will be described below with reference to the drawings.

(Overall Configuration of Printer) FIG. 1 is a perspective view of an ink jet printer to which the present invention is applied, and FIG. 2 is an explanatory diagram showing an outline of a paper transport path. Explaining with reference to these figures, the inkjet printer 1
It has a roll paper loading mechanism 2 and a paper feed port 3 for cut sheets (cut paper, slip paper, etc.) of A4 size or the like, and a roll paper 4 supplied from the roll paper loading mechanism 2 and a paper feed port 3 The transport path is configured so that the cut sheet 5 to be inserted is transported through the print position 11 (the area surrounded by the dashed line in the figure). Roll paper 4 passing printing position 11
The inkjet head 8 is held by a carriage mechanism 9 so as to face the surface of the cut sheet 5.

The carriage mechanism 9 includes a guide shaft 6
And a carriage 7 held reciprocally along the guide shaft 6 in a direction orthogonal to the transport direction of the roll paper 4 and the cut sheet 5, and a motor (not shown) for driving the carriage. I have. An ink supply unit 10 mounted at a position adjacent to the roll paper loading mechanism 2 via an ink tube (not shown)
Supplies ink.

The printing position 11 is defined by a paper guide member 11A having a flat surface.
In the portion on the roll paper transport side, there is a horizontally elongated opening 11F.
Are formed. At the opening 11F, a platen roller (roll paper feed roller) 26 and a paper guide 27 forming a smooth continuous surface on the surface thereof are exposed, whereby the roll paper 4 and the cut paper 5 are formed. Defines a common printing position.

In the present embodiment, the platen roller 26 and the paper guide 27 are attached to the tip of the opening / closing lid 130 of the roll paper loading mechanism 2, and when the opening / closing lid 130 is closed, as shown in FIG. Located inside the open / close lid 1
When 30 opens, it retreats rearward from the opening 11F.

The remaining print position 11 defined by the paper guide surface of the paper guide member 11A defines the print position for the cut sheet 5.

The carriage 7 is capable of reciprocating in the width direction within a range including the print position 11, and a retreat position of the inkjet head 8 is located at a position deviated from the print position 11 to one side in the width direction. Capping mechanism 1
1B capping surface 11C is arranged. In a state in which the ink jet head 8 waits for a printing operation, the nozzle surface is set to a state in which the nozzle surface is closed by the capping surface 11 </ b> C, so that the ink meniscus of each ink nozzle is prevented from retreating, ink drying, and the like. Further, in the printer 1 of the present embodiment, as described later, the cut sheet 5 inserted into the sheet feed port 3 is transported until the leading end thereof reaches a position beyond the printing position 11. It is held at the evacuation position.

As shown in FIG. 2, the cut sheet 5 is
, The cut sheet 5 is conveyed toward the printing position 11, and the cut sheet 11 after printing is discharged from the printing position 11 to the outside. In this transport path, a paper feed roller pair 41 is disposed at a position downstream of the paper feed port 3, and a main feed roller pair 21 is disposed between the paper feed roller pair 41 and the printing position 11. .
Further, a discharge roller pair 22 is disposed downstream of the printing position 11.

On the other hand, the roll paper 4 is unwound from the roll body 4A loaded in the roll paper loading mechanism 2, passes between the paper guide 27 and the pressing roller 15, and passes through the printing position. , Platen roller 26 (paper feed roller)
And the pressing roller 16 are conveyed. The transport of the roll paper 4 is performed by the rotation of the platen roller 26.

Here, the printing position 1
A movable paper guide plate mechanism 30 described below is incorporated in the portion reaching 1.

(Movable paper guide plate mechanism) The transport path of the cut paper 5 is almost entirely defined by a pair of guide plates facing each other at regular intervals. However, printing position 1
In 1, the inkjet head 8 side is in an open state, and printing can be performed by the inkjet head 8 on the surface of the cut sheet 5 passing through the printing position 11.

Since one side of the printing position 11 is open, the cut position 5 is defined when the cut-sheet paper 5 with the curl, wrinkles, or folds is conveyed to the leading portion. Paper guide surface 11D (paper guide member 1)
1A, the surface defined by the platen roller 26 and the paper guide 27) to the open side, and may hit the nozzle surface of the inkjet head 8 or the like, resulting in a paper jam.

On the other hand, the platen roller 26 and the paper guide 27 which define the printing position of the roll paper 4 are attached to the opening / closing lid 130 of the roll paper loading mechanism 2 as will be described in detail later. Opening / closing lid 13 at times
When 0 is opened, it retreats backward from the printing position. As a result, the opening 11F where the platen roller 26 and the paper guide 27 are located is in a completely open state, and the roll paper fed from the newly loaded roll body 4A is moved from the opening 11F to the side of the inkjet head 8 from the opening 11F. There is a possibility that it may be greatly curved and sagged.

In addition to this, when removing the roll paper core remaining in the roll paper loading mechanism 2 when replacing the roll paper,
The roll paper core may roll down from the opening 11F to the inkjet head 8 side.

In order to avoid these disadvantages, the printer 1 of the present embodiment incorporates a movable paper guide plate mechanism 30 in a portion surrounded by imaginary lines in FIG.

The movable paper guide plate mechanism 30 includes a movable paper guide plate 31. The movable paper guide plate 31 is opened toward the ink jet head 8 at the printing position 11 when the apparatus power is off. The open part is covered. That is, the opening 11F of the printing position 11 is closed. When the apparatus power is turned on, the movable paper guide plate 31
Moves to the retracted position, and the closed state of the opening 11F is released.

When the opening / closing cover 130 of the roll paper loading mechanism 2 is opened while the apparatus power is on, the opening 11F is closed, and when the opening / closing cover 130 is closed, the closed state of the opening 11F is released.

Further, during printing of the cut sheet, while the leading end of the cut sheet 5 is conveyed to a position beyond the printing position 11, the ink jet head 8 at the printing position 11 is moved by the movable paper guide plate 31. The part that is open to the side is temporarily shielded. In the shielding state, the cut sheet 5 is transported along a transport path defined between the movable paper guide plate 31 and the paper guide surface 11D. Therefore, the conveyance direction does not deviate to the side of the ink jet head 8 and a paper jam does not occur.

Note that the ink jet head 8 is held at the retracted position 11C while the portion at the printing position 11 is shielded by the movable paper guide plate 31.

Referring mainly to FIGS. 3, 4, 5 and 6, the structure of the movable paper guide plate mechanism 30 will be described.

First, FIG. 3A shows a schematic configuration of a movable paper guide plate mechanism 30 incorporated in a lower portion of a partition plate 91 (see FIG. 2) disposed below the carriage mechanism 9. FIG. 3B is a schematic configuration diagram when the movable paper guide plate mechanism 30 is viewed from the lateral direction. FIG. 4 (A),
(B) is an explanatory view for explaining the operation of the movable paper guide mechanism. FIG. 5 is an exploded perspective view showing a part of the movable paper guide plate mechanism 30.

As shown in these figures, the movable paper guide plate mechanism 30 includes a stepping motor 32 as a driving source, and the output shaft of the stepping motor 32 is moved via a reduction gear train 33 in the carriage movement direction ( (Horizontal direction). A spiral cam groove 34a is formed on the outer peripheral surface of the cylindrical cam 34. A sliding pin 35 is engaged with the cam groove 34a, and the sliding pin 35 is attached to a slider 36 which can slide in the carriage moving direction.

The slider 36 can reciprocate along a slide shaft 36a attached to a horizontally long holding plate 37. By appropriately setting the pitch of the cam groove 34a,
When the cylindrical cam 34 is rotated, the slider 36 reciprocates along the slide shaft 36a in the carriage movement direction by an amount corresponding to the amount of rotation.

The slider 36 is connected to a drive plate 38 having inclined cam grooves 38a and 38b formed on both sides in the same direction. This drive plate 38 is also a slider 36
And is slid integrally therewith, and is disposed on the back side of the pressing plate 37. The movable guide plate 31 is arranged on the back side of the drive plate 38.

The movable guide plate 31 is attached to the holding plate 37 so as to be movable in a cut sheet transport direction parallel to the paper guide surface 11D. In addition, on the surface of the movable guide plate 31, the inclined cam grooves 38a,
8b, the tip is inserted, and sliding pins 31a and 31b slidable along the groove are attached. Moreover,
The tip is inserted into a vertical cam groove 37a extending in the cut sheet transport direction opened on the fixedly arranged pressing plate 37, and a sliding pin 31c movable along the groove is also attached.

Therefore, when the cylindrical cam 34 rotates from the state shown in FIG. 3A, the slider 36 slides in the carriage movement direction. As described above, the movable guide plate 31
The vertical cam groove of the holding plate 37 in which a pair of sliding pins 31a, 31b attached thereto are inserted into the inclined cam grooves 38a, 38b of the driving plate and one sliding pin 31c is fixedly arranged. 37a. Therefore, when the driving plate 38 slides together with the slider 36,
The movable paper guide plate 31 is pushed up in the cut sheet transport direction along the vertical cam groove 37a. As a result, the holding plate 3
The movable paper guide plate 31 hidden behind the back of 7 rises along the paper guide surface 11D defining the printing position 11, and
The paper guide surface 11D is in a state of being opposed to the paper guide surface 11D.

That is, the state shown in FIGS. 4A and 4B is formed. Therefore, if the movable paper guide plate 31 is pushed up in synchronization with the transport operation of the cut sheet 5, the cut sheet 5 is
The movable paper guide plate 31 guides the print position 11 to a transport path 11E formed downstream of the print position 11 in the transport direction.

Here, the movable paper guide plate 31 of this embodiment has a paper press 31e provided with a paper press surface 31d protruding toward the paper guide surface 11D, and a holding device for holding the paper press 31e. And a plate 31f. The paper pressing surface 31d of the paper pressing 31e is a continuous surface having a length including the maximum width of the cut sheet 5 to be conveyed. By forming the paper pressing surface 31d of this form, the entire cut sheet 5 to be conveyed can be conveyed while being pressed against the paper guide surface 11D. Transport can be performed smoothly.

The holding plate 31f is moved by the spring force.
Always keep the paper holding surface 31d of the paper holding surface 31e on the paper guide surface 1
It is urged in the direction of pressing against 1D. With this spring force, the cut sheet 5 to be conveyed can be prevented from being conveyed while being lifted from the paper guide surface 11D.

In addition to this, in the movable paper guide plate mechanism 30 of the present embodiment, the movable paper guide plate 31 and the movable paper guide plate 31 are centered on the lower end portion (upstream end in the transport direction) of the holding plate 37. It is possible to turn in the direction away from the guide surface 11D.
It is pressed against the paper guide surface 11D by a spring force of a coil spring or the like so as not to separate. With such a configuration, when paper jams occur, by turning them, the conveyance path of the cut sheet is expanded, and the operation of removing the jammed paper pieces can be easily performed.

Next, in the printer 1 of this embodiment, a pair of paper feed rollers and a paper stopper 42 are arranged in this order on the transport path from the paper feed port 3 to the print position 11.
FIG. 6 is an exploded perspective view showing components of these parts in an exploded manner. The structure of these parts will be described mainly with reference to FIGS.

First, the feed roller pair 41 includes a drive-side feed roller 41a and a driven-side press roller 41b, and the press roller 41b is connected to the drive-side feed roller 41a.
Can be moved between a contact position contacted with a constant pressing force and a separation position separated from the paper feed roller 41a. That is, the pressing roller 41 b is rotatably supported by one end 43 a of the turning lever 43. A sliding pin 44 as a cam follower is fixed to the other end 43b of the turning lever 43. The sliding pin 44 always contacts the cam surface formed on the outer peripheral surface of the disc-shaped cam plate 45 by a spring force. The disc-shaped cam plate 45 is connected to the cylindrical cam 34 via a gear train 46.

Accordingly, the disk-shaped cam plate 45 is rotated in conjunction with the rotation of the cylindrical cam 34, and when the cam plate 45 is rotated, the sliding pins 44 contacting the outer peripheral surface of the cam plate 45 are rotated. Move according to. That is, the turning lever 43 to which the sliding pin 44 is attached turns around the turning center. As a result, the pressing roller 41b supported at the other end of the turning lever 43 is moved between the contact position shown in FIG.
It moves between the separated positions shown in (B).

On the other hand, the paper stopper 42 is normally kept at the closed position where the conveyance path is closed as shown in FIG. 3A by the spring force of the coil spring 46. One end 47a of a turning lever 47 is engaged with the paper stopper 42. The swivel lever 47 is configured to rotate integrally with a swivel lever 48 formed at the other end via a connecting portion 47b. A sliding pin 49 as a cam follower is attached to the tip of the turning lever 48. The sliding pin 49 is constantly pressed against a cam surface formed on the outer peripheral surface of the disc-shaped cam plate 51 by a spring force. The disc-shaped cam plate 51 is connected to the cylindrical cam 34 via a gear train 46 and a cam plate 45.

Accordingly, the disc-shaped cam plate 51 also rotates in conjunction with the rotation of the cylindrical cam 34, and when the cam plate 51 rotates, the sliding pins 49 abutting on the outer peripheral surface of the cam plate 51 rotate the rotation position of the cam plate 51. Move according to. That is, the turning lever 48 to which the sliding pin 49 is attached turns around the turning center axis 43c that defines the turning center. As a result, the swivel lever 47 integrated with the swivel lever 48 also swivels, and the paper stopper 42 supported by the swivel lever opposes the spring force to move the transport path as shown in FIG. Move to the open position.

(Single-sheet paper transport operation) Next, referring to the timing chart of FIG.
1. Slip holding roller 41b and paper stopper 42
A description will be given of the operation of transporting the cut sheet inserted into the paper feed port 3 with a focus on the operation described in FIG.

The initial state is as follows. The movable paper guide plate 31 is, as shown in FIGS.
7 is located in a retracted position hidden behind the back side. Press roller 41
b is at a position separated from the paper feed roller 41a, and the paper stopper 42 is at a closed position where the transport path is closed. on the other hand,
In the main paper feed roller pair 21 arranged on the upstream side of the printing position 11, the feed roller 21a and the pressing roller 21b are always in a contact state. In contrast, printing position 1
In the pair of paper discharge rollers 22 arranged downstream of the feed roller 1, the feed roller 22a and the pressing roller 22b are in a state of being separated from each other.

In this state, the operator inserts the cut sheet 5 from the paper feed port 3 and pushes it until it hits the paper stopper 42. Thereby, the cut sheet 5 is set. Next, the step motor 32 is driven, the cylindrical cam 34 rotates, and the two disc-shaped cam plates 4 connected thereto are rotated.
5 and 51 also rotate in conjunction. As a result, the pressing roller 41b starts moving toward the paper feed roller 41a from the first time point T1 in FIG. 7, and the paper stopper 42 also starts turning in the direction to open the transport path.

Here, as shown in FIG. 3 (A), in order to detect the home position of the interlocking cylindrical cam 34 and disk-shaped cam plates 45 and 51, they are integrated with the disk-shaped cam plates 45 and 51. A rotating blade 52 that rotates as follows is formed,
By detecting the rotational position of the rotary blade 52 by a sensor including a photocoupler 53 and the like, a detection signal (HP detection signal) indicating the home position of these members is provided.
I'm trying to get

At the next second time point T2, the pressing roller 4
1b is a paper feed roller 41a from the top of the inserted cut sheet 5;
Reaches a position pressed by a constant pressing force against the, and is maintained in this state. The paper stopper 42 also reaches the open position where the transport path is completely opened, and is maintained in this state.

Next, at a time point between the second time point T2 and the third time point T3, after confirming the ON state of the HP detection signal, the paper feed motor (not shown) is driven to drive the first paper feed The operation is performed (“sheet feed 1” in FIG. 7). That is,
A slip feed roller 4 is driven by a paper feed motor (not shown).
1a is rotated. At the same time, the main feed roller 21a constituting the main feed roller pair 21 arranged on the upstream side of the printing position 11 is rotated. Here, the leading end of the paper feed amount is the transport path 11E on the downstream side of the print position 11.
It is set to the amount just before entering.

From the third time T3 thereafter, the slider 36 starts sliding with the rotation of the cylindrical cam 34, and the movable paper guide plate 31 gradually starts listing on the side of the printing position 11. I do. Then, at the fourth time point T4, the movable paper guide plate 31 is completely exposed, and
1 is in a state of facing the paper guide surface 11D defining the number 1. This state is the state shown in FIGS. 3C and 3D.

Here, when the movable paper guide plate 31 moves, the cut sheet 5 is also conveyed by the main feed roller 21a and the paper feed roller 41a as described above. By appropriately setting the pitch of the cam groove 34a of the cylindrical cam 34, the leading end of the cut sheet 5 to be conveyed is exactly at the leading end 31d of the movable paper guide plate 31 and the paper guide surface 1d.
The cut sheet 5 and the movable paper guide plate 31 can be moved synchronously while maintaining the state of being sandwiched between 1D. That is, the second paper feeding operation (paper feeding 2) is performed.

When the movable paper guide plate 31 has finished moving in this state, the paper pressing surface 31d and the paper guiding surface 11D at the end thereof are moved.
Cut sheet 5 conveyed with the top part sandwiched between
Reaches the transport path 11E on the downstream side of the printing position 11, and is guided into the transport path 11E. Thereafter, a fifth time point T
From the fifth to the sixth time, the pressing roller 41b is separated from the sheet feeding roller 41a.

As a result, the head of the cut sheet 5 is
The sheet passes through the print position 11 and enters the transport path 11E on the downstream side, that is, is positioned at the start position of the print operation. After that, the step motor 32 is reversed,
The state returns to the state between the time points T2 and T3.

When it is confirmed that the HP detection signal is in the ON state between the time points T2 and T3, the carriage mechanism 9 is driven to move to the retreat position 11
Move the inkjet head 8 retracted to C,
A predetermined printing is performed on the cut sheet 5. After the printing operation is completed by repeating the printing operation and the transport operation of the cut sheet 5,
The cut sheet 5 is discharged.

Here, immediately before the trailing end of the cut sheet 5 after the printing is disengaged from the main paper feed roller pair 21, the discharge roller pair 22 disposed downstream from the printing position 11.
Closes. As a result, the cut sheet 5 to be discharged is transferred from the main paper feed roller pair 21 to the discharge roller pair 22, and is completely discharged.

The operation modes of the movable paper guide plate 31, the pressing roller 41b, and the paper stopper 42 described above are based on the cam groove of the cylindrical cam 34 constituting the power transmission mechanism for driving these members. Disc-shaped cam plates 45, 5
This can be realized by appropriately setting the contour shape of the cam surface on the outer periphery of the first cam.

(Roll Paper Loading Mechanism) Next, the structure of the roll paper loading mechanism 2 in this embodiment will be described in detail.

FIG. 8 is a perspective view showing the roll paper loading mechanism 2 taken out of the ink jet printer 1. FIG. 9-
FIG. 13 is an explanatory diagram showing the opening / closing operation of the roll paper loading unit, and FIG. 9 is an explanatory diagram showing a partial configuration thereof. FIG.
FIG. 4 is an explanatory diagram for describing a detection mechanism for detecting opening and closing of the opening / closing lid.

(Overall Configuration of Roll Paper Loading Mechanism) Referring to these drawings, the roll paper loading mechanism 2 includes the mounting frame 1 mounted on the printer frame 12.
The mounting frame 121 has a roll paper loading section 122 in which the roll paper 4 is loaded. The roll paper loading unit 122 includes a semicircular curved portion 122a having a fixed width and a rectangular opening 122b formed above the curved portion 122a. Exchange or replenishment of the roll paper 4 is performed from the opening 122b.

The roll paper loading opening 122 b can be opened and closed by an opening / closing lid 130 composed of a lid frame 123, a slide frame 125 and a cover frame 128.

(Structure of Opening / Closing Cover) A lid frame 123 which is a component of the opening / closing cover 130 has a top plate portion 123a having a rectangular shape substantially the same as the opening 122b, and a top plate portion 123
a is provided with side plates 123b and 123c which are bent downward at right angles from the left and right of FIG. Side plate part 1
The rear ends of 23b and 123c are bent downward, and the lower ends 123d and 123e are rotatably supported by a shaft 124 that defines the center of rotation. Both ends of the shaft 124 are attached to the mounting frame 121.
Supported by Therefore, the lid frame 123
The roll paper loading unit 12 around the shaft 124
2 can be swung between a closed position where the roll paper loading opening 122b is closed (the state shown in FIG. 9) and an open position where the opening 122b is fully opened (the state shown in FIG. 12). .

A slide frame 125 is attached to the lid frame 123 having this configuration. The slide frame 125 pivots integrally with the lid frame 123 and is slidable with respect to the lid frame 123.
A paper guide 27 for guiding the roll paper 4 is attached to the platen roller 26.

First, a configuration in which the slide frame 125 is slidably attached to the lid frame 123 will be described with reference to FIG. Slide frame 1
25 is a rectangular top plate portion 125a in contact with the back side of the top plate portion 123a of the lid frame 123, and a constant height side plate portion 125b bent downward at right angles from both sides of the top plate portion 125a. , 125c. Guide slits 125d, 125f are formed in the top plate portion 125a in the front-rear direction, and guide pins 123q, 123r fixed to the surface plate portion 123a of the lid frame 123 pass through these slits. . Retaining rings 123h and 123i are attached to the lower ends of the guide pins 123q and 123r, whereby the slide frame 125 is slidably attached to the back surface of the lid frame 123.

A coil spring 123g is bridged between the rear guide pin 123r and a spring hook 125g formed on the front portion of the slide frame 125, and the spring force of the coil spring 123g is applied. By
The slide frame 125 is always biased rearward.

Next, as can be seen from FIG. 8, the front ends 12 of the side plate portions 125b and 125c of the slide frame 125 are formed.
A platen roller 26 is bridged between 5h and 125i, and both ends of a support shaft of the platen roller 26 are rotatably supported by front ends 125h and 125i. Below the platen roller 26, a paper guide 27 having a convex arcuate surface shape is attached from the outer peripheral surface of the platen roller 26 in a tangential direction.

Here, when the lid frame 123 is in the closed state (see FIG. 9), the platen roller 26 and the paper guide 27 supported at the tip of the slide frame 125 are moved.
The roll paper loading unit 22 is positioned at an operating position protruding toward the inkjet head 8 from an opening 122F formed in the front plate 122A of the roll paper loading unit 22. The opening 122F is formed at the printing position 11 on the printer body side.
F.

In this operation state, a state is formed in which the pressing roller 116 attached to the printer main body is pressed against the outer peripheral surface of the platen roller 26 with a certain elastic force.

That is, the pressing roller 116 can move slightly in the direction in which the rotation center shaft 116 a approaches and separates from the platen roller 26.
It is constantly biased toward the platen roller 26 by a spring force. Accordingly, when the platen roller 26 is positioned at its operating position against the spring force, the outer peripheral surface of the platen roller 26 sandwiches the roll paper 4 and is pressed by the pressing roller 116 with a constant spring force. Become. As a result, when the platen roller 26 rotates, the roll paper 4 sandwiched between these rollers is transported.

Similarly, the paper guide 2 attached to the tip of the slide frame 125 together with the platen roller 26
When the platen roller 26 reaches the operating position, the surface 27a of the printer 7 also moves the pressing roller 115 attached to the printer body against the elastic force. As a result, the surface 27a of the paper guide 27 is also pressed by the pressing roller 115 with a certain elastic force, sandwiching the roll paper 4.

Next, a cover frame 128 having a size slightly larger than that of the cover frame 123 is disposed above the cover frame 123. The cover frame 128 has a top plate portion 128a.
And side plate portions 128b and 128c which are bent downward at right angles from both sides thereof. Rear end portions of the side plate portions 128b and 128c extend downward and are rotatably supported by a shaft 124. . When the cover frame 128 is turned, the slide frame 1
The lid frame 123 to which the reference numeral 25 is attached is configured to rotate in conjunction with the lid frame 123. Also, the lid frame 123
Has closed the roll loading opening 122b (FIG. 10).
After reaching the state shown in FIG.
Can be turned independently. The single pivoting movement of the cover frame 128 causes the slide frame 12
5 performs a sliding motion with respect to the lid frame 123 in the front-back direction.

The link mechanism 129 for converting the independent turning motion of the cover frame 128 into the sliding motion of the slide frame 125 is provided on the side plate portion 128 of the cover frame 128.
A connection shaft 128d is provided between the rear upper end portions of the slide frames 125b and 128c, and three connection holes 125j are formed at three rear end portions of the slide frame 125 through which the connection shaft 128d passes. This connection hole 125
j has a vertically long slot shape so as not to hinder the independent turning movement of the cover frame 128. Therefore, FIG.
The position of the connection shaft 128d in a state in which the lid frame 123 closes the opening 122b for loading the roll paper as shown in FIG. 9 when the cover frame 128 is further turned to the horizontal state as shown in FIG. The position is moved forward and downward about the shaft 124 that defines the center of rotation.

The connecting shaft 128d freely moves downward along the vertically long connecting hole 125j, and pushes the connecting hole 125j forward to move. As a result, the slide frame 125 in which the connection hole 125j is formed is pushed forward as a whole. That is, slide forward with respect to the lid frame 123,
A platen roller 26 and a paper guide 27 supported at the front end protrude forward through an opening 122F, appear in an opening 11F formed at a printing position 11 by the inkjet head 8, and Thus, a state (operating position) of facing each other while maintaining a certain gap is obtained.

Conversely, when the cover frame 128 is pivoted upward from the horizontal position shown in FIG. 9 to the position shown in FIG. 10, the slide frame 125 slides backward as a whole, Platen roller 26
And the paper guide 27 moves from the operating position to the retracted position where it is retracted.

Here, as described above, the slide frame 125 is urged by the coil spring 123g by the elastic force in the retreating direction. Therefore, when the pressing force of the cover frame 128 is released in the state of FIG. 9 in which the cover frame 128 is closed until it becomes horizontal, the slide frame 1 is pulled by the tensile force of the coil spring 123g.
25 returns to the retreat position thereafter. In conjunction with this sliding motion, the cover frame 128 also turns in the opening direction to
It returns to the state shown in.

In order to lock the cover frame 128 to the closed position shown in FIG. 9, a lock lever 280 is attached to the front end of the cover frame 128. With the cover frame 128 closed, hooks 128g, 128h formed at both ends of the lock lever 280 are provided.
At the front side portion of the mounting frame 121 facing the engaging portion 121, the hook can be swung from below and engaged.
g, 121h are formed. Lock lever 280
Is always urged by a torsion spring (not shown) in the direction in which the hook pivots upward.

Next, in the roll paper loading mechanism 2 of this embodiment, the position (operating position) of the platen roller 26 at the tip of the slide frame 125 is accurately positioned with the cover frame 128 closed as described above. There is a mechanism for That is, the slide frame 1
The front end portions of the side plate portions 125b and 125c have positioning pins 1 that protrude horizontally toward the left and right.
25k, 125l are attached. On the contrary,
When the slide frame 125 is closed, these positioning pins 12k are attached to portions of the mounting frame 121 facing these positioning pins 125k and 125l.
Semicircular grooves 121k and 121l into which 5k and 125l are just fitted from the lateral direction are formed.

Since these grooves 121k and 121l are formed at fixed positions, the positioning pins 125k and 125l of the slide frame 125 are
k, 121l, slide frame 1
The position (operating position) of the platen roller 26 at the tip of 25 is always accurately defined. Therefore, this platen roller 2
A constant gap is always formed between the platen roller 26 and the ink nozzle surface of the inkjet head 8 that reciprocates left and right while maintaining a predetermined gap with respect to the printing surface 11 on which the outer peripheral surface of the ink jet head 6 is located. .

The side walls 1 of the mounting frame 121
Coil springs 123j and 123k are bridged between the side plates 21b and 121c and the side plate portions 123b and 123c on both sides of the lid frame 123, respectively. Shaft 1
When opening and closing the cover frame 128, the slide frame 125, and the lid frame 123 around the center 24,
FIG. 1 shows the position of the center of gravity just above the shaft 124.
After passing through the turning position shown in FIG. 1, the coil springs 123j, 123k are expanded so that the turning trajectories of the spring-hung portions at both ends of the coil springs 123j, 123k are widened.
Is arranged.

Therefore, when the cover frame 128 is further opened beyond the turning position shown in FIG. 11, the coil springs 123j and 123k are extended, so that a pulling force for urging the cover frame 128 in the closing direction acts. I do. As a result, it is possible to avoid the problem that the cover frame 128 or the like is opened vigorously and collides with other portions.

Conversely, when the cover frame 128 is closed beyond the turning position shown in FIG. 11, the cover frame 128 is closed vigorously by the spring force of the coil springs 123j and 123k, and the roll paper loading section is closed. Opening 12
The adverse effect of colliding with 2b can be avoided.

(Lock Detection Mechanism of Opening / Closing Cover) Here, the printer 1 of this embodiment is provided with a lock detecting mechanism for the opening / closing cover for detecting that the opening / closing cover 130 is closed. FIG.
2 shows a portion of a roll paper loading mechanism to which a lock detection mechanism is attached. In the other drawings, the lock detection mechanism is not shown for easy understanding of each part.

The lock detecting mechanism is provided with a lock lever 28.
The lock lever detects that one of the hooks 128h is locked on the side of the mounting frame 21, and as shown in FIG. 285 and a photointerrupter 288 for detecting the turning lever 285, and these members are mounted on the mounting frame 121 side.

The swivel lever 285 is held so as to be able to swivel around its bent portion. Also, at all times,
It is urged by a spring member in a direction of turning from a position shown by an imaginary line in FIG. 14 to a position shown by a solid line (not shown). An engaging pin 286 is provided at the upper end of the turning lever 285.
Is attached. When the lid 130 is closed,
The engagement pin 286 of the turning lever 285 contacts the front surface of the hook 128h of one lock lever. After the engaging pin 286 hits the front surface, the turning lever 285 is
From the position shown by the solid line to the position shown by the imaginary line.

Here, as described above, the cover frame 1
28, the lock lever hook 128
g and 128h are the engaged portions 121 on the frame 121 side.
g, 121h, and the open / close lid 130 is held in the closed state. In the locked state of the opening / closing lid 130, the other end 287 of the turning lever 285 is connected to the photo interrupter 28.
8 enters the detection position. For this,
When the hook 128h of the lock lever is locked, the photo interrupter 288 outputs a detection signal indicating the locked state.

When the upper end portion 128i of the lock lever 280 is lifted to open the opening / closing lid 130, the lock lever 280 pivots around its pivotal center 128B, and the hooks 128g and 128h at its lower end move toward the frame 121. From the engaged portions 121g and 121h.

When the lock is released, the swing lever 285
Returns to its initial position (the position shown by the imaginary line in FIG. 14) by the spring force, and the lower end portion thereof
Out of the detection area. As a result, it is detected that the lock has been released based on the output of the photo interrupter.

(Opening / closing of the open / close lid and operation of the movable paper guide plate)
In this example, the open / close lid 1 is operated by the lock detection mechanism having the above-described configuration.
When the opening of the movable paper guide plate 30 is detected, the movable paper guide plate mechanism 30 is driven, and the movable paper guide plate 31 is moved to the pressing plate 3.
7 appear upward from the position hidden by the
Is completely closed. That is, the opening 122F on the side of the roll paper loading mechanism 2 formed at a position corresponding to the opening 11F is also in a closed state.

FIG. 15 shows a state in which the opening 122F is closed by the movable paper guide plate 31 immediately after the lock of the opening / closing lid 130 by the lock lever 280 is released. When the roll paper body 4A is replaced, the roll paper core 4C remains at the bottom of the roll paper loading unit 122 as shown in FIG. The roll paper core 4 </ b> C is finger-inserted into the roll paper loading unit 122.
When the roll paper core 4C is taken out along the bottom surface of the paper roll 4C, the roll paper core 4C may roll down to the ink jet head 8 from the opening 122F. However, in this example, when the opening / closing lid 130 is opened, the opening 122F is closed by the movable paper guide plate 31, so that such a situation can be avoided. Therefore,
The work of removing the roll paper core 4C is simplified.

Next, after the cover 130 is fully opened (as shown in FIG. 12) and the roll paper body 4A is replaced with a new one, when the cover 130 is closed, the roll paper body 4A is unwound from the roll paper body 4A. If the roll paper 4 is arranged as shown by a dashed line in FIG. 15, when the cover 130 is closed, the roll paper 4 reaches the print position 11 via the space between the paper guide 27 and the roller 15, and And the platen roller 26 and roller 1
6 can be automatically formed along the transport path discharged to the outside via the space between the two.

Here, when the roll paper 4 is arranged in this manner before the opening / closing lid 130 is closed, and when the opening 122F is completely open, as shown by the imaginary line 4D in FIG. There is a possibility that the roll paper 4 protrudes greatly from the portion 122F toward the inkjet head. When the cover 130 is closed in this state, it is necessary to perform a roll paper feeding operation to remove such a large slack.

However, in this example, since the opening 122F is closed by the movable paper guide plate 31, the swelling of the roll paper 4 toward the ink jet head is suppressed by the movable paper guide plate 31, so that In addition, the amount of slack when replacing the roll paper body can be reduced.

When the cover 130 is completely closed and locked in that state by the lock lever 280, this is detected by the lock detecting mechanism. As a result, the movable paper guide plate 31 descends and is hidden by the holding plate 37, and the opening 1
The closed state of 1F and 122F is released. Thus, printing on the roll paper 4 is enabled.

On the other hand, in the printer 1 of this embodiment, the opening 122F is closed by the movable paper guide plate 31 even when the apparatus power is off. That is, the replacement of the roll paper may be performed while the apparatus power is off. Also in this case, it is necessary to prevent the roll paper core from rolling down to the inkjet head side. Also, it is necessary to reduce the amount of slack in the roll paper.

Such a movable paper guide plate 3 when the power is turned off.
The operation 1 may be performed, for example, by moving the movable paper guide plate 31 in conjunction with a software switch. Also,
When the apparatus power is turned on, the operation program may be set so that the movable paper guide plate 31 is moved to perform an initial operation for releasing the closed state of the opening 122F.

(Operation of Roll Paper Loading Mechanism) FIGS. 9 to 1
The opening and closing operations of the roll paper loading unit 122 in the roll paper loading mechanism 2 will be described together with reference to FIGS.

First, as shown in FIG.
When the upper end portion 128i of the lock lever 280 is pulled upward in a state where the lock 22 is closed, the hooks 128g and 128h of the lock lever are disengaged from the engaged portions 121g and 121h on the frame 121, and the lock is released.

As a result, since the turning lever 285 is disengaged from the detection area of the photointerrupter 288, the lock is released and it is detected that the opening / closing lid 130 is opened. When it is detected that the opening / closing lid 130 is opened, the movable paper guide plate mechanism 30 is driven, and the movable paper guide plate 31 appears at the printing position 11, and as shown in FIG.
Is formed.

When the lock of the opening / closing lid 130 is released, the cover frame 128, which is a component of the lid 130, is pivoted upward, and the slide frame 125 and the lid frame 123 are integrally receded in the horizontal direction. The state shown in FIG. This turning and sliding operation is mainly performed by the spring force of the coil spring 123g bridged between the slide frame 125 and the lid frame 123.

Thereafter, when the cover frame 128 is turned backward against the spring force of the coil springs 123j and 123k, the state shown in FIG.
The opening 122b of the roll paper loading unit 122 is fully opened. That is, from above the opening 122b, the cover frame 128, the slide frame 125, the lid frame 123
Are in a retracted state.

After the fully opened state, the roll paper 4 can be replaced with the roll paper loading section 122a. Since the opening 122b is fully open, the roll paper 4
The replacement work of A is easy. Also, the platen roller 2
6. Since the paper guide 27 is also retracted together with the slide frame 125, the work of arranging the unwinding portion of the roll paper body 4A can be easily performed. Further, as described above, since the opening 122F communicating with the printing position 11 by the inkjet head 8 is also closed by the movable paper guide plate 31, the work of taking out the used roll paper core 4C can be easily performed. .

After loading a new roll paper body 4A, the cover frame 128 is turned in the closing direction. By this operation, the cover frame 128, the slide frame 125, and the lid frame 123 are swiveled together to pass through the state of FIG. 11, and the lid frame 123 closes the opening 122b as shown in FIG. . Thereafter, the lid frame 123 engages with the edge of the opening 122b and does not pivot any further. Therefore, this lid frame 1
The slide frame 125 slidably mounted on 23 does not pivot any further. So after this,
Only the cover frame 128 turns independently.

When the cover frame 128 is pushed and turned to the position shown in FIG.
The motion is converted into a sliding motion of the slide frame 125 via the second frame 29. That is, the slide frame 125 slides forward with respect to the lid frame 123 so that the platen roller 26 and the paper guide 27 supported at the front end thereof can face the inkjet head 8 with a certain gap ( Operating position).

When the slide frame 125 slides forward, the positioning pins 125k and 125l at both ends of the slide frame 125 are fitted into the grooves 121k and 121l on the mounting frame 121 side, and the sliding position is fixed. In other words, the platen roller 26 and the paper guide 27 are held at the preset facing positions, and a state where a certain gap is formed between the platen roller 26 and the moving plane of the nozzle surface of the inkjet head 8 is formed.

When the slide frame 125 slides forward, the lock lever hooks 128g and 128h are locked to the engaged portions 121g and 121h on the frame side. Further, the turning lever 285 is turned by the front surface of the hook 128h of the lock lever 280, and its lower end portion 2
87 enters the detection area of the photointerrupter 288.
As a result, it is detected that the cover 130 is locked.

When it is detected that the opening / closing lid 130 is locked in the closed state, the movable paper guide plate 31 moves and the closed state of the opening 122F is released. As a result, the platen roller 26 and the paper guide 27 can be viewed from the side of the inkjet head 8 via the opening 122F and the opening 11F.

(Another Example of Roll Paper Loading Mechanism) Next, FIG.
Reference numeral 6 denotes a roll paper core 4 when the roll paper body 4A is replaced.
Another configuration example for simplifying the removal of C is shown.

The difference between the roll paper loading mechanism 2A of the present embodiment and the roll paper loading mechanism 2 of the above example is that the roll paper loading section 122 on which the roll paper body 4A is loaded has a roll paper roll preventing roll. This is a point where a vertical wall surface is formed. The rest is the same as the roll paper loading mechanism 2 of the above example, so only the differences will be described.

As can be seen from FIG. 16, a vertical wall surface 301 is formed on the bottom surface of the roll paper loading section 122 at a position upstream of the opening 122F in the roll paper transport direction. A horizontal surface 302 is formed continuously from the lower end of the vertical wall surface 301. Vertical wall surface 301 in this example
And the width of the horizontal plane 302 in the roll paper transport direction is approximately
The dimensions are the same as the diameter of the roll paper core 4C.

In the roll paper loading section 122 having this configuration, when the roll paper core 4A is scraped up with a finger, the roll paper core 4
C rides on a horizontal plane 302 and hits a vertical wall surface 301 which is continuous with the horizontal plane 302, so that rolling is prevented. Therefore, the roll paper core 4C can be easily grasped while being pressed against the vertical wall surface 301. Also, this vertical wall 301
This also prevents the roll paper core 4C from rolling down from the upper opening 122F to the inkjet head 8 side.

(Other Embodiments) The above examples relate to embodiments in which the present invention is applied to an ink jet printer. The present invention is a print head of a type other than an inkjet head as a print head, for example,
The same can be applied to a printer having a wire dot head.

In the above example, the opening / closing of the opening / closing lid is detected based on the locked state of the opening / closing lid. However, the mechanism for detecting the opening / closing of the opening / closing lid is not limited to the above example.
Other configurations may be used. For example, a configuration in which the position of the opening / closing lid itself is directly detected to detect the opening / closing thereof may be employed.

Further, in the above-described ink jet printer, printing is performed not only on roll paper but also on cut paper. However, the ink jet printer is mounted on a POS terminal or the like that prints only on generally used roll paper. It goes without saying that the present invention can be similarly applied to a printer to be used.

[0123]

As described above, the roll paper printer of the present invention includes a roll paper loading mechanism in which a paper guide member such as a platen roller moves together with an opening / closing lid. It is characterized by having a movable paper guide plate capable of closing an opening for facing each other.

Therefore, when the opening / closing lid is opened and the paper guide member retreats from the opening, the opening is closed by the movable paper guide plate, so that the remaining roll paper core is taken out when the roll paper is replaced. In this case, it is possible to prevent the roll paper core from rolling down from the opening toward the print head. Therefore, it is not necessary to carefully remove the roll paper core so that such a situation does not occur, so that the work of removing the roll paper core when replacing the roll paper is simplified.

Further, by closing the opening, it is possible to avoid the problem that the roll paper swells from the portion to the print head side and the slack amount increases.

Next, the present invention employs a configuration in which a vertical wall surface for preventing the roll paper core from rolling is disposed upstream of the opening in the roll paper transport direction. With this vertical wall surface, the roll paper core can be prevented from rolling, and the roll paper core can be easily picked with a finger. Further, the roll paper core is prevented from rolling down from the opening toward the print head. Therefore, the work of removing the roll paper core when replacing the roll paper is simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an inkjet printer to which the present invention is applied.

FIG. 2 is an explanatory diagram showing a paper transport path in the inkjet printer of FIG.

3A and 3B are diagrams showing a movable paper guide plate mechanism in the ink jet printer of FIG. 1, wherein FIG. 3A is a schematic configuration diagram showing a planar configuration thereof, and FIG. 3B is a schematic configuration diagram showing a side configuration thereof.

4A and 4B are diagrams illustrating a movable paper guide plate mechanism in the ink jet printer of FIG. 1, wherein FIG. 4A is an explanatory diagram illustrating a state in which the movable paper guide plate appears, and FIG. It is explanatory drawing which looked at the state which appeared from the side.

FIG. 5 is an exploded perspective view showing a driving portion of the movable paper guide plate of the movable paper guide plate mechanism of FIG. 3;

6 is an exploded perspective view showing driving portions of a slip holding roller and a paper stopper of the movable paper guide plate mechanism of FIG. 3;

FIG. 7 is a timing chart for explaining the operation of the movable paper guide plate mechanism of FIG. 3;

FIG. 8 is a partial perspective view showing a roll paper loading mechanism in the inkjet printer of FIG.

9 is an explanatory diagram illustrating a state in which a roll paper loading unit of the roll paper loading mechanism in FIG. 8 is closed.

FIG. 10 is an explanatory diagram showing a state after a lock of a cover frame closing a roll paper loading section of the roll paper loading mechanism of FIG. 8 is released.

FIG. 11 is an explanatory view showing a state in which the cover frame of the roll paper loading mechanism of FIG.

FIG. 12 is an explanatory diagram showing a state in which a roll paper loading unit of the roll paper loading mechanism of FIG. 8 is fully opened.

FIG. 13 is an explanatory diagram showing a state in which a slide frame is attached to a lid frame in the roll paper loading mechanism of FIG. 8;

FIG. 14 is an explanatory view showing a lock detection mechanism of the opening / closing lid.

FIG. 15 is an explanatory diagram showing a state in which an opening is closed by a movable paper guide mechanism.

FIG. 16 is an explanatory diagram showing another example of the roll paper loading mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink-jet printer 2 Roll paper loading mechanism 3 Paper feed port 4 Roll paper body 4A Roll paper 4C Roll paper core 4D Portion swelling from an opening in roll paper 5 Cut sheet 6 Guide shaft 7 Carriage 8 Inkjet head 9 Carriage mechanism 10 Ink supply unit 11 Printing position 11D Paper guide surface 11D defining printing position 11F Opening 12 Printer body frame 21 Main paper feed roller pair 22 Discharge roller pair 30 Movable paper guide plate mechanism 31 Movable paper guide plates 31a, 31b, 31c Sliding pin 31d Paper holding surface 31e Paper holding 31f Holding plate 32 Motor 34 Cylindrical cam 34a Cam groove of cylindrical cam 35 Sliding pin 36 Slider 37 Holding plate 37a Vertical cam groove 38 Drive plate 38a, 38b Inclined cam groove 41 Feeding Roller pair 41a Paper feed roller 41 Pressing roller 42 Paper stopper 43 Rotating lever 44 Sliding pin 45 Disc-shaped cam plate 47 Rotating lever 49 Sliding pin 51 Disc-shaped cam plate 115 Pressing roller 116 Pressing roller 121 Mounting frame 122 Roll paper loading section 122b Roll paper Opening of loading portion 123 Lid frame 124 Shaft defining center of rotation 125 Slide frame 125 j Connection hole 126 Platen roll 127 Paper guide 127 a Paper guide surface 128 Cover frame 128 d Connection shaft 129 Link mechanism 280 Lock lever 128 g, 128 h Hook 128 i Lock lever 285 Rotating lever 288 Photointerrupter 301 Vertical wall surface for preventing roll paper core rolling 302 Horizontal surface continuous with vertical wall

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yasuo Mizuno 3-3-5 Yamato, Suwa-shi, Nagano F-term in Seiko Epson Corporation (reference) 2C056 EA20 HA29 2C060 BA03 BA12

Claims (7)

[Claims] 1. A roll paper loading section, an opening / closing lid for opening and closing the roll paper loading section, a roll paper guide member attached to the opening / closing lid for defining a printing position, and the roll paper guide member being attached to a print head. A roll paper printer having an opening formed in the roll paper loading section for confronting the roll paper printer, further comprising a movable paper guide plate capable of closing the opening. 2. The paper guide plate according to claim 1, further comprising a detecting means for detecting that the opening / closing lid is opened, and when the detecting means detects that the opening / closing lid is opened, the movable paper guide plate. A printer for roll paper, wherein the opening is closed. 3. The roll paper printer according to claim 1, wherein the opening is closed by the movable paper guide plate when the power of the apparatus is turned off. 4. The roll paper roll according to claim 1, wherein a vertical wall surface for preventing roll paper core rolling is formed at a position upstream of the opening in the roll paper transport direction. A printer for roll paper, characterized in that: 5. The roll paper printer according to claim 4, wherein the vertical wall surface is formed continuously with the opening edge of the opening on the upstream side in the roll paper transport direction. 6. A roll paper loading section, an opening / closing lid for opening and closing the roll paper loading section, a roll paper guide member attached to the opening / closing lid for defining a printing position, and the roll paper guide member serving as a print head. In a roll paper printer having an opening formed in the roll paper loading section to confront the roll paper, a vertical wall surface for preventing roll paper core rolling is provided at a position upstream of the opening in the roll paper transport direction. A roll paper printer characterized by being formed. 7. The roll paper printer according to claim 6, wherein the vertical wall surface is formed continuously with an opening edge of the opening on the upstream side in the roll paper transport direction.