JP2000158738A - Large printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a large printer in which incomplete cutting of a roll sheet can be prevented by preventing a cutter holder from floating when the roll sheet is cut off. SOLUTION: A large printer comprises a sheet feed section, a printing section and a sheet discharge stack section disposed vertically in this order and a roll sheet being fed from the sheet feed section is printed at the printing section. The printing section is provided with a cutter 42 held by a cutter holder 41 wherein a printed roll sheet 3 is cut off by moving the cutter holder 41 in the breadthwise direction of the roll sheet 3 while clamping the roll sheet 3 between the forward end face 42A of the cutter holder 41 and a cutter guide 44. In such a large printer, the forward end face 42A of the cutter holder 41 is beveled 41B. According to the structure, the cut-off part of the roll sheet 3 can be prevented from abutting against the cutter holder 41 to float the cutter holder 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-sized printer using roll paper, and more particularly to a large-sized printer for printing on large-sized paper having a width of 420 mm or more.

[0002]

2. Description of the Related Art As a large-size printer using roll paper, the present applicant has first arranged a paper feed unit, a print unit, and a paper discharge stack unit in an upper, middle, and lower positional relationship. An application in which a paper transport path extending from a printing unit to a paper discharge stack unit is formed almost straight from an obliquely upper back side to an obliquely lower front side. The roll paper drawn from the paper feed unit is printed by the print head of the printing unit when the roll paper is transported on the paper transport path.

[0003] Further, as shown in FIG. 8, a cutter holder 4 is provided in the printing section for cutting the roll paper 3 after printing.
1, a cutter 42 is provided. The cutter holder 41 is connected to a solenoid 43, and is driven by the solenoid 43 to move in the vertical direction in the drawing. Further, a cutter guide 44 is provided on the printer main body side facing the distal end surface 42A of the cutter holder 41.
Then, when cutting the roll paper 3 after printing, the roll paper 3 is sandwiched between the distal end surface 42A of the cutter holder 41 and the cutter guide 44 as shown in FIG. The roll paper 3 is cut by the cutter 42 by moving the paper 3 in the width direction (the direction perpendicular to the paper surface of the drawing).

[0004]

However, according to the above-mentioned prior art, since the distal end surface 42A of the cutter holder 41 is flat, when the roll paper is cut, the cut portion of the roll paper is removed by the cutter holder. The cutter holder 41 is lifted up by coming into contact with the front end surface 42A, and a cutting failure occurs. That is, when the roll paper is cut in the width direction, as shown in FIG.
A is curled (curved) because the binding force is lost, but the uncut portion 3B is in a restrained state. As a result, the curling force of the cut portion 3A with the cutter blade position A as a base point is reduced by the cutter. It acts on the tip end surface of the holder and pushes up the cutter holder, so that the blade of the cutter does not bite into the roll paper, resulting in defective cutting.

SUMMARY OF THE INVENTION An object of the present invention is to provide a large-size printer capable of preventing a cutting failure of roll paper by preventing a cutter holder from floating when cutting roll paper.

[0006]

According to a first aspect of the present invention, a paper feed unit, a print unit, and a discharge stack unit are arranged in an upper, middle, and lower positional relationship. ,
A paper transport path from the paper supply unit to the paper discharge stack unit via the printing unit is formed substantially straight from the obliquely upper back side to the obliquely lower front side, and the printing unit is provided with a cutter. This is a large-sized printer configured to cut a printed roll paper by sandwiching roll paper between a leading end surface of a cutter holder holding a cutter and a printer body and moving the cutter holder in a roll paper width direction. When the cut portion of the roll paper curls on the leading end surface of the cutter holder and the cut end abuts on the leading end surface of the cutter holder, the curl force of the roll paper is released to release the curl force. A means for preventing a curl force from being applied to the cutter holder is provided.

According to the present invention, even if the cut portion curls and comes into contact with the tip surface of the cutter holder when cutting the roll paper, the above-mentioned means releases the curling force of the roll paper.
The roll force does not directly act on the cutter holder, and it is possible to prevent the cutter holder from floating. Thereby, the cutting failure of the roll paper can be prevented.

According to a second aspect of the present invention, in the large-size printer according to the first aspect, the means includes:
It is a chamfer formed on a downstream side of the cutter along a roll paper conveying direction on a tip end surface of the cutter holder.

According to the present invention, since the chamfer is formed at the tip end surface of the cutter holder, the roll paper curls while sliding the cut portion along the chamfer when cutting the roll paper. For this reason, the roll force of the roll paper does not act on the cutter holder side, and the lifting of the cutter holder can be simplified and prevented.

According to a third aspect of the present invention, in the large-sized printer according to the first aspect, the cutter holder is attached to a print head. The print head is generally configured to perform printing by moving in the width direction of the roll paper, and if the cutter holder is attached to the print head as in the present invention, the cutter holder is moved in the width direction of the roll paper. There is no need to provide a separate mechanism for moving, and the configuration can be simplified.

According to a fourth aspect of the present invention, there is provided the large-size printer according to any one of the first to third aspects, wherein the cutting is performed near the downstream side of the cutter holder in the roll paper conveying direction. A member for suppressing the curl of the rolled paper is provided. If a chamfer is provided on the tip surface of the cutter holder, when cutting the roll paper, there is no restriction on the curl of the roll paper, so the roll paper tends to curl greatly.
According to the present invention, since the member for suppressing the curl of the cut roll paper is provided, excessive curl of the roll paper can be suppressed.

[0012] According to a fifth aspect of the present invention, in the large-size printer according to the fourth aspect, the member includes:
It is a discharge assist roller that guides the roll paper in the discharge direction during printing. According to the present invention, since the existing paper discharge auxiliary roller is also used as a member for suppressing excessive curling of the roll paper, there is no need to newly provide a component, which is advantageous in cost.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view of a large-sized printer according to the present invention, FIG. 2 is a schematic front view of the large-sized printer, and FIG. 3 is a schematic longitudinal sectional view when rigid rigid paper is printed by the large-sized printer. FIG. 4 is an external perspective view of the large printer. 5 and 6 are detailed views of the printing unit, and FIG. 7 is an enlarged view of a roll paper cutting mechanism provided in the printing unit.

The large printer according to the present embodiment is shown in FIG.
As shown in the figure, the paper feed unit 30, the printing unit 7, and the paper discharge stack unit 8 are arranged in an upper, middle, and lower positional relationship. A paper transport path from the paper supply unit 30 to the paper discharge stack unit 8 via the printing unit 7 is formed substantially straight from the obliquely upper back side to the obliquely lower front side. The paper feed unit 30 can feed both the roll paper 3 and the large rigid thick paper 21 (see FIG. 3). In particular,
The roll paper is attached to the paper feeding unit 30 so that it can be removed at the time of replacement, and the rigid cardboard 21 can be set by placing it on the slope on the front side of the paper feeding unit 30 as shown in FIG. Is configured.

The printing section 7 has a flat paper discharge guide 23 which forms a part of the paper transport path below the print head 22 and the like. 25 are provided. The suction port 25 sucks the sheet by the suction force and controls the transport state. A roll paper cutting mechanism 40 for cutting the printed roll paper is attached to the print head 22. The paper discharge stack unit 8 is a part for receiving printed paper, and the roll paper 3
When printing the rigid cardboard 21, the stack cloth 27 is spread on the front of the printer, or the printed matter is guided to the lower part of the printer main body in the state shown in FIG. 1, and when the rigid cardboard 21 is printed, the rigid cardboard 21 is discharged as shown in FIG. It is formed so as to be retracted to a position where it does not interfere.

FIG. 2 is a schematic front view of the large-sized printer according to the above embodiment.
A pair of spindle receivers 2a and 2b are further provided below the pair of spindle receivers 1a and 1b. The two long spindles 4 and 5 to which the roll papers 3 and 3 are attached are respectively provided between the spindle receivers 1a and 1b and 2a and 2b.
It is laid between b. That is, both ends 4a and 4b of the spindle 4 are mounted on a pair of spindle receivers 1a and 1b, and both ends 5a and 5b of the spindle receiver 5 are mounted on a pair of spindle receivers 2a and 2b. In FIG. 2, reference numeral 6 denotes the spindle receivers 1a, 1b and 2a,
2 shows a frame of a printer main body to which 2b and the like are attached.

As shown in FIG. 1, the two spindles 4 and 5 are arranged in an oblique vertical relationship in which the upper spindle 4 is relatively rearward with respect to the worker 9. The roll paper 3 is arranged so as to be conveyed along a paper conveyance path which is formed substantially straight up and down diagonally toward the entrance of the printing unit 7 and the discharge stack unit 8.

As shown in FIG. 3, the rigid cardboard 21 is configured so that it can be set by placing it on the inclined surface on the front side of the sheet feeding unit 30. Reference numeral 30 is formed so that a roll paper cover 28 provided on the front surface of the loaded roll paper 3 also serves as a support portion 29 when the rigid cardboard 21 is set.

Next, the details of the roll paper cutting mechanism 40, which is a main component of the large printer according to the present embodiment, will be described with reference to FIGS.

As shown in FIG. 5, the roll paper cutting mechanism 40
Is provided with a cutter 42 held by a cutter holder 41. A solenoid 43 is disposed laterally of the cutter holder 41, and the upper portions of the cutter holder 41 and the solenoid 43 are connected by a cutter lever 45. The cutter holder 41 and the solenoid 43 are installed on a print head holder 46 that holds the print head 22, and the print head 22 moves in the width direction of the roll paper 3 along with the movement of the print head 22 in the width direction of the roll paper 3 (that is, (In the direction perpendicular to the plane of the drawing). Further, the cutter holder 41 is provided with a return spring 47, and the cutter holder 41 is constantly urged by the return spring 47 in the upward direction in the figure (in the direction away from the opposing roll paper 3).

Further, the tip surface 42 of the cutter holder 41
A is a means for preventing the curl force of the cut portion of the roll paper from being applied to the cutter holder 41.
B is given. The chamfer 41 </ b> B is formed downstream of the cutter 42 along the transport direction of the roll paper 3. In FIG. 5, the roll paper 3 is transported from right to left. Note that the chamfer 41B formed on the distal end surface of the cutter holder 41 may be a curved surface with a slight radius instead of a flat shape.

On the other hand, the tip end surface 42A of the cutter holder 41
A cutter guide 44 is provided on the printer main body side facing the printer. This cutter guide 44 has a stepped portion 4
4A is provided, and the stepped portion 44A is formed at a position matching the cutter 42 when the cutter holder 44 is moved downward.

In the above-described configuration, before cutting the roll paper 3 after printing, the cutter holder 4 together with the print head 22 is cut.
1 has been returned to the home position. Then, when the solenoid 43 is energized, as shown in FIG.
1 is moved downward, and the distal end surface 42 of the cutter holder 41 is moved.
The roll paper 3 is held between A and the cutter guide 44. At this time, the cutter guide 44 has a stepped portion 44A.
Is formed, so that the front end face 4 of the cutter holder 41 is formed.
The 2A cutter 42 enters the space 44B formed by the stepped portion 44A and does not contact the cutter guide 44 (see FIG. 7).

Next, the cutter holder 41 is moved together with the print head 22 in the width direction of the roll paper 3 (in the direction perpendicular to the plane of the drawing), and the roll paper 3 is cut by the cutter 42. When the roll 3 is cut by the cutter 42, the roll paper 3 is curled by the curling force. In the present embodiment, since the chamfer 41B is formed on the tip end surface 42A of the cutter guide 41, the roll paper 3 is cut. Cut part 3A (see FIG. 9)
Slides along the chamfer 41B and can curl without being restrained. Therefore, the curl force of the roll paper 3 does not act on the cutter holder 41, and the cutter holder 4
Since the floating of the roll paper 3 can be prevented, the cutting failure of the roll paper 3 can be prevented.

When the chamfer 41B is provided on the tip end surface 42A of the cutter holder 41 as described above, when the roll paper 3 is cut, there is no restraint on the cut portion 3A, so that the roll paper 3 curls greatly. Will be.

Therefore, in the present embodiment, the paper discharge auxiliary roller 48 is used as a member for suppressing the curl of the roll paper 3. The paper discharge auxiliary roller 48 is provided to mainly suppress the curl of the roll paper 3 from becoming large during printing, and to guide the paper in the paper discharge direction in that state. If used, there is no need to newly provide a mechanism for suppressing the cut roll paper 3 from curling greatly, which is advantageous in cost.

[0027]

As described above, according to the present invention,
When cutting the roll paper, even if the cut portion curls and comes into contact with the tip surface of the cutter holder, the curling force of the roll paper can be released, so that the roll force does not directly act on the cutter holder. As a result, it is possible to prevent the cutter holder from being lifted up, thereby preventing cutting failure of the roll paper.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a large printer according to the present invention.

FIG. 2 is a schematic front view of the large printer.

FIG. 3 is a schematic longitudinal sectional view when printing rigid cardboard by the large-sized printer.

FIG. 4 is an external perspective view of the large printer.

FIG. 5 is a detailed view of a roll paper cutting mechanism.

FIG. 6 is a diagram illustrating a state where a roll is cut by a roll paper cutting mechanism.

FIG. 7 is an enlarged view showing how a roll is cut by a roll paper cutting mechanism.

FIG. 8 is a detailed view of a roll paper cutting mechanism according to the related art.

FIG. 9 is a diagram illustrating a state in which roll paper cut by a cutter is curled.

[Explanation of symbols]

 REFERENCE SIGNS LIST 3 roll paper 7 printing section 8 discharge stack section 30 paper feed section 40 roll paper cutting mechanism 41 cutter holder 41B chamfer 42 cutter 42A cutter tip end face 43 solenoid 44 cutter guide 44A stepped section 44B space section 45 cutter lever 47 return Spring 48 Discharge auxiliary roller

Claims (5)

[Claims] 1. A sheet feeding section, a printing section, and a sheet discharging stack section are arranged in an upper, middle, and lower positional relationship, and a sheet transport path from the sheet feeding section to the sheet discharging stack section via the printing section is provided. It is formed substantially straight from the obliquely upper back side to the obliquely lower front side, a cutter is provided in the printing unit, and the roll paper is sandwiched between the tip end surface of a cutter holder holding the cutter and the printer body. A large-sized printer configured to cut the printed roll paper by moving the cutter holder in the roll paper width direction, wherein the cut portion of the roll paper curls on the tip end surface of the cutter holder. Means are provided to prevent the curl force from being applied to the cutter holder by releasing the curl force of the roll paper when the cut end of the roll comes into contact with the tip surface of the cutter holder. Large printers, characterized by that. 2. A large-size printer according to claim 1, wherein said means is a chamfer formed on a distal end surface of said cutter holder at a downstream side of said cutter along a roll paper conveying direction. 3. The large-size printer according to claim 1, wherein the cutter holder is attached to a print head. 4. The apparatus according to claim 1, wherein a member for suppressing curling of the cut roll paper is provided near the downstream side of the cutter holder along the roll paper transport direction. Features a large printer. 5. A large-size printer according to claim 4, wherein said member is a discharge assist roller for guiding roll paper in a discharge direction during printing.