JP2000072288A - Roll paper holding device - Google Patents

Abstract

(57) [Summary] To provide a roll paper holding device capable of handling a plurality of types of roll paper. SOLUTION: The roll paper is placed on a base while being sandwiched by a pair of holding plates 13, and is further sandwiched and supported by a guide slidably contacting the base. Holding plate 13
Are provided with a plurality of types of cores 14 and 22 fitted to the inner circumferences of a plurality of types of roll paper R having different diameters. The core 22 is detachably formed on the holding plate 13 by the engagement structure 25. This makes it possible to select the cores 14 and 22 according to the inner diameter of the core of the roll paper R,
A plurality of types of roll paper R can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll paper holding device which is used by being attached near a paper feed port of a printer and supports roll paper.

[0002]

2. Description of the Related Art A roll paper holding device is used near a paper feed port of a printer. In the roll paper holding device,
Conventionally, a cantilevered support shaft is passed through the inner periphery of the roll paper, and a pair of holding plates that position both sides of the roll paper are positioned on the shaft, or the roll paper is formed into a concave surface like the inner surface of a cylinder. There is a structure to put directly.

On the printer body side, there are a center reference for positioning with reference to the center in the width direction of the sheet and a one-side reference for positioning with reference to one of the left and right side edges of the sheet.

When paper is fed from the roll paper holding device to the printer body, it is necessary to perform a paper positioning operation in order to prevent the roll paper from meandering, printing position deviation, paper jam, and the like.

Conventionally, the position of the roll paper relative to a predetermined position in the printer main body is adjusted by reading a scale attached to a shaft supporting the roll paper, or visually aligning the scale with a paper width guide of the printer main body. Have gone.

In a structure in which the roll paper is placed directly on the concave surface, a member for positioning the roll paper in the width direction is often not provided.

[0007]

In the structure in which the roll paper is sandwiched between a pair of pressing plates attached to the shaft, when the force for pulling out the roll paper strongly acts on the shaft, the shaft is pulled in the paper feeding direction. In addition, there is a disadvantage that an oblique pulling force acts on the roll paper, the outer peripheral side of the pressing plate is bent, and skew or meandering occurs. This tendency is particularly remarkable when the holding plate is attached to the shaft using spring properties.

Further, in a roll paper holding device having a structure in which the paper is positioned by relying on a scale attached to a shaft, particularly when the paper is positioned on the basis of the center, errors such as misreading of the scale by an operator may cause an error. The center position of the roll paper may be displaced from the center position of the printer body. Therefore, there are inconveniences that the roll paper meanders or skews, a printing position is shifted, and a paper jam occurs.

In a roll paper holding device having a structure in which roll paper is directly placed on a concave surface, when a roll paper having a large diameter is used,
The force required for pulling out increases, and an overload is applied to the drive system for transporting the paper on the printer body side. Further, when the diameter of the roll paper is large, the roll paper is deformed by its own weight, which makes it more difficult to pull it out. In addition, since the roll paper is rubbed against the concave surface when being pulled out, the roll paper wound with the print surface facing outward has an adverse effect on the print surface.

In order to eliminate these disadvantages, the inventor has
The following roll paper holding device is considered. That is, a pair of press plates having a diameter larger than the maximum diameter of the roll paper to be used presses both side edges of the roll paper, and the roll paper sandwiched between the press plates is placed on the base, and is erected on the base. This is a roll paper holding device that is further sandwiched and supported by a guide. This prevents the pressing plate from bending, and reduces the frictional resistance when the roll paper is pulled out by lifting the outer peripheral surface of the roll paper from the base.

In such a roll paper holding apparatus, in order to prevent the press plate and the roll paper from spinning, it is necessary to provide a core that fits into the roll paper core on the surface of each press plate facing each other.

However, there are many types of roll paper, and the inner diameter of the core is not one type. Further, since the core of the roll paper is made of paper, the dimensional error of the inner diameter is large, and a gap may be formed between the inner peripheral surface of the core and the outer peripheral surface of the core even if the cores are of the same size.

An object of the present invention is to provide a roll paper holding device capable of handling a plurality of types of roll paper.

Another object of the present invention is to prevent a core detachable from the holding plate from being lost.

Still another object of the present invention is to prevent idle rotation between the core and the roll paper.

[0016]

According to a first aspect of the present invention, there is provided a roll paper holding apparatus comprising: a pair of pressing plates for pressing both side edges of roll paper; and a plurality of types of roll paper having different diameters. A plurality of types of cores to be fitted, an engagement structure for detachably attaching the core to the holding plate, and a base on which the roll paper is placed; and a base slidably movable in a direction in which one approaches or separates from the other. A pair of guides standing upright on the base and supporting the pair of pressing plates.

Therefore, it is possible to replace the core according to the inner diameter of the core of the roll paper.

According to a second aspect of the present invention, there is provided the roll paper holding device according to the first aspect, wherein the core is detachably attached to both sides of the pressing plate.

Therefore, the core that is not used is attached to the surface of the holding plate that is not in contact with the roll paper.
Loss can be prevented.

The invention according to claim 3 is the invention according to claim 1 or 2
The roll paper holding device according to any one of the preceding claims, wherein a core that fits on the inner periphery of the roll paper protrudes from the pressing plate.

Therefore, it is possible to cope with one type of roll paper.

According to a fourth aspect of the present invention, in the roll paper holding apparatus according to the first, second or third aspect, a rib substantially parallel to an axial direction of the roll paper is formed on an outer peripheral surface of the core. .

Therefore, since the core on which the ribs are formed is pressed into the core, the core can be fitted to the core having poor dimensional accuracy.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a roll paper holding device according to the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view showing the appearance of a roll paper holding device 1 of the present embodiment and a printer 2 using the roll paper holding device 1, and FIG. FIG. 2 is a vertical right side view schematically showing a structure of the printer 2.

The roll paper holding device 1 is attached to the rear end of the printer 2. The position of the roll paper holding device 1 with respect to the printer 2 is determined by fitting two convex portions 3 and 4 projecting downward from the rear end of the printer 2 and two concave portions 5 and 6 formed at the front end of the roll paper holding device 1. Determined by the combination. Here, the one concave portion 6 is formed in a long hole shape in order to escape a dimensional error between the convex portions 3 and 4 or a dimensional error between the concave portions 5 and 6. Therefore, the fitting between the convex portion 3 and the concave portion 5 is a reference for positioning.

On the back side of the printer 2, a paper feed port 7 into which the paper s drawn from the roll paper R held by the roll paper holding device 1 is inserted is formed. Printer 2
A paper discharge port 8 for discharging the printed paper s is formed at the front of the printer. The printer 2 has a paper feed port 7
A paper transport path 9 for transporting the paper s from the paper discharge port 8 to the paper discharge port 8 is formed.

On the upstream side of the paper discharge port 8, a platen 10 is disposed below the paper transport path 9, and a thermal head 11 is disposed above the paper transport path 9.

Downstream of the paper feed port 7, a paper guide section 12 for positioning the paper s inserted from the paper feed port 7 with reference to the center is provided.

Next, the structure of the roll paper holding device 1 will be described. First, the roll paper holding device 1 includes a pair of pressing plates 13 that sandwich both side edges of the roll paper R. The pressing plate 13 has a disk shape, and the diameter is larger than the maximum diameter of the roll paper R to be used. At the center of the surface of the pressing plate 13 that comes into contact with the roll paper R, a core 14 that is a fitting portion that fits on the inner periphery of the roll paper R is provided in a protruding manner. A support shaft 15 is protrudingly provided at the center of the surface of the holding plate 13 opposite to the surface on which the core 14 protrudes.

The roll paper holding device 1 is provided with concave portions 5 and 6.
Has a base 16 formed at the front end. Base 1
6 has a concave surface 17 shaped like an inner surface of a cylinder. Two support rollers 18 and 19 are embedded in the concave surface 17 in parallel with the sheet width direction. Part of the outer peripheral surfaces of the support rollers 18 and 19 project from the concave surface 17.

A pair of guides 20 slidable in the sheet width direction is provided between the support roller 18 and the support roller 19 on the concave surface 17. The guides 20 are linked to each other in directions approaching and moving away from each other by a rack and pinion structure (not shown). Each guide 20 is provided with a lock lever 21 for locking the slide.

The structure of the holding plate 13 will be described in detail with reference to FIGS. An engaging hole 22 is formed in the holding plate 13 that presses both side ends of the roll paper R. The engaging hole 22 is detachable from above the core 14 and has an inner diameter of the core 1.
The engaging claw 24 provided on the core 23 fitted to the core r larger than 4 engages. Here, an engagement structure 25 is formed by the engagement holes 22 and the engagement claws 24.

On the outer peripheral surfaces of the core 14 and the core 23, ribs 26 substantially parallel to the axial direction of the roll paper R to be fitted are provided.
Are formed. At the ends of the ribs 26 farther from the presser plate 13, tapered portions 27 that become higher from farther to closer to the presser plate 13 are formed.

In such a configuration, the paper s pulled out of the roll paper R supported by the roll paper holding device 1
Is inserted into the printer 2 from the paper supply port 7, printed by the thermal head 11 while being conveyed by the platen 10, and discharged from the paper discharge port 8.

The roll paper R is set on the roll paper holding device 1 and is rotatably supported. To set, first, if the core 14 matches the inner diameter of the core r of the roll paper R, the core 23 is removed, the core 14 is pressed into the core r, and both ends of the roll paper R are pressed with the holding plate 13. suppress. If the core 23 matches the inner diameter of the core r of the roll paper R, the core 23 is attached to the holding plate 13 by the engagement structure 17 and the core 23 is pressed into the core r, and the right and left ends of the roll paper R are inserted. Is sandwiched between a pair of holding plates 13.

Next, the roll paper R sandwiched by the holding plate 13
Is positioned on the recess 17. Here, the circumferential surface of the holding plate 13 contacts the supporting rollers 18 and 19,
Is larger than the diameter of the roll paper R, the roll paper R does not contact the support rollers 18 and 19 and the recess 17. Then, the respective guides 20 are slid in the directions approaching each other, and the respective guides 20 are brought into contact with the respective holding plates 13. When the position of each guide 20 is determined, each lock lever 21 is rotated to lock the slide of each guide 20.

According to the present embodiment, the roll paper R is a pressing plate 1 having a diameter larger than the maximum diameter of the roll paper R to be used.
3, the paper surface of the roll paper R is not rubbed against the concave surface 17 and the support rollers 18 and 19 when the roll paper R is pulled out. The surface is not damaged.

According to the present embodiment, one of the two types of cores 14 and 23 can be selected and used, so that two types of cores r can be handled.

Next, a second embodiment of the present invention will be described with reference to FIG. Note that the same portions as those described in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The roll paper holding device of the present embodiment comprises a pressing plate 31 for pressing both side edges of the roll paper R, and a pressing plate 31.
3 types of cores 3 which are detachable and have different diameters
2, 33, and 34. FIG. 5 shows a case where the core 33 is used.

Each of the cores 32, 33, 34 has an engagement claw 35, and an engagement hole 36 into which the engagement claw 35 is fitted.
Are formed on the holding plate 31. Here, the engaging claw 3
The engagement structure 37 is constituted by the engagement hole 5 and the engagement hole 36.

The cores 32, 33, 34 are detachable from both sides of the holding plate 31.

Further, on the opposing surfaces of the pressing plates 31, the engaging claws 35 of the core attached to the opposite surfaces are released from the side ends of the roll paper R and the pressing plates 3 are pressed.
A plurality of reinforcing ribs 38 for increasing the rigidity of the first member are formed.

In such a configuration, the unused cores 32, 34 can be attached to the holding plate 31, so that the unused cores 32, 34 are not lost.

Next, a third embodiment of the present invention will be described with reference to FIG. The roll paper holding device according to the present embodiment includes a pressing plate 41 that presses both side edges of the roll paper R.
And three types of cores 42, 43, 44 having different diameters, respectively.
And

Here, the cores 42, 43, 44 are respectively formed with an engaging hole 45 formed in the holding plate 41 and the cores 42, 43, 44.
Engaging structure 47 composed of engaging claws 46 provided in 43 and 44
Thereby, it is detachable from the holding plate 41.

The pressing plate 41 is provided with reinforcing ribs 48 on both sides thereof for releasing the engaging claws 46 from the side ends of the roll paper R and increasing the rigidity of the pressing plate 41. Moreover,
A core 49 having a different size from the cores 42, 43, 44 is provided on one surface of the holding plate 41.

In such a configuration, more types of cores can be used than the pressing plate 31 of the second embodiment, so that more types of roll paper R can be handled.

In the second and third embodiments, three types of detachable cores are provided on the holding plate. However, in practice, the number of detachable cores does not have to be three. .

[0051]

According to the first aspect of the present invention, a plurality of types of cores can be detachably attached to the holding plate by the engagement structure, so that the cores can be exchanged. To replace the core.

According to the second aspect of the present invention, since the core is detachable on both sides of the holding plate, an unused core can be attached to the surface of the holding plate which is not in contact with the roll paper. Loss can be prevented.

According to the third aspect of the present invention, since the pressing plate is provided with the core that is fitted to the inner periphery of the roll paper, it can be used for one type of roll paper.

According to the fourth aspect of the present invention, since ribs substantially parallel to the axial direction of the roll paper are formed on the outer peripheral surface of the core, the core on which the ribs are formed is pressed into the core, so that dimensional accuracy is improved. The core can be fitted to the bad core, and the core and the core can be prevented from running idle.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a roll paper holding device according to a first embodiment of the present invention and a printer using the same.

FIG. 2 is a right side longitudinal sectional view schematically showing the internal structures of the roll paper holding device and the printer.

3A is a right side view of a holding plate, and FIG. 3B is a vertical sectional front view.

FIG. 4 is a longitudinal sectional front view showing ribs formed on an outer peripheral surface of a core.

FIG. 5A is a right side view showing a pressing plate according to a second embodiment of the present invention, and FIG. 5B is a longitudinal sectional front view.

FIG. 6A is a right side view showing a pressing plate according to a third embodiment of the present invention, and FIG. 6B is a vertical sectional front view.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 roll paper holding device 13 press plate 23 core 25 engagement structure 31 press plate 32, 33, 34 core 37 engagement structure 38 rib 41 press plate 42, 42, 44 core 47 engagement structure 48 rib 49 core R roll paper

Continuing on the front page (72) Inventor Teruyuki Ochiai 570 Ono-cho, Oni-cho, Tagata-gun, Shizuoka Prefecture Inside the Tech Ohi Plant (72) Inventor Yoshifumi Sakamoto 570 Ono-cho, Oni-cho, Tata-gun, Shizuoka Pref. In-house F-term (reference) 2C060 BA07 BC24 3F052 AA01 AB05 BA02 BA19

Claims (4)

[Claims] 1. A pair of pressing plates for pressing both side edges of a roll paper, a plurality of types of cores respectively fitted on inner circumferences of a plurality of types of the roll papers having different diameters, and the core being attached to and detached from the pressing plate. An engaging structure that is freely attached; a base on which the roll paper is placed; and a pair of uprights erected on the base so as to be slidable in a direction in which one of the roll papers approaches and separates from the other and supports the pair of pressing plates. A roll paper holding device having a guide. 2. The roll paper holding device according to claim 1, wherein the core is detachable from both sides of the pressing plate. 3. The roll paper holding device according to claim 1, wherein a core that fits on the inner periphery of the roll paper protrudes from the pressing plate. 4. The roll paper holding device according to claim 1, wherein a rib substantially parallel to an axial direction of the roll paper is formed on an outer peripheral surface of the core.