JP2000063045A - Take-up core for information recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the insertion of a jig or the fixation of a core to the jig even if there exists more or less difference in dimension between the inner diameter of a take-up core and the outer diameter of a take-up fixing jig. SOLUTION: In a cylindrical take-up core, the application of ripple processing locally onto the inner circumferential surface thereby allows a first inner circumferential surface 7 to be provided so as to be frictionally engaged with the chuck part or the pawl of a fixing jig to be inserted, and also allows a second inner circumferential surface 6 smaller in inner diameter than the first inner circumferential surface to be provided so as to be frictionally engaged with the chuck or the pawl of the aforesaid fixing jig.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording sheet used for an image printing apparatus such as a xerographic system, an electrostatic recording system, a thermal system or an inkjet system and a thermal transfer system, and a sheet for recording an information recording sheet such as a film. Regarding the take core.

[0002]

2. Description of the Related Art A cylindrical or roll type roll paper is widely used as a paper for recording the output of a large or medium-sized copying machine, a facsimile, a computer, a word processor, a plotter and the like. This roll-type information recording sheet is advantageous in that it is less bulky at the time of storage and use and has better settability on a machine than the cut-sheet type one.

Such roll paper is packaged and shipped in a state of being wound around a paper tube finished to a predetermined standard size. For example, an information recording roll paper used in a conventional A0 size to A3 size image printing apparatus has an inner diameter of about 3 mm.
It was shipped from a trader such as the applicant in a state of being wound around a paper tube formed to a size of inch with a length of 200 m.

By the way, the paper tube is manufactured in a tubular shape by applying an adhesive to the paper tube base paper, winding it in multiple layers around a mandrel with a spiral winder, and then extruding the paper so as to have a predetermined inner diameter. Since the raw material of the paper tube is made of organic natural fiber, it has hygroscopicity or dehumidifying property, and has the property that swelling or contraction due to moisture absorption and desorption is unavoidable. Therefore, after a lapse of time after the manufacture of the paper tube, the fiber expands or contracts due to moisture absorption or moisture release to cause a dimensional change, and the inner diameter of the paper tube contracts or expands more than the manufacturing finished size.

On the other hand, as will be described in detail later, a winding fixing jig that is inserted and set inside the paper tube when the roll paper is mounted in the paper feeding section of each machine is easy because the inner diameter of the paper tube is small. There was a problem that it could not be inserted into the paper, or conversely it could be inserted, but it was loose and could not be sufficiently fixed to the paper tube.

Further, the winding and fixing jig itself may be insufficiently fixed to the paper tube due to its own wear.
The fixing jig is an important part for fixing the paper tube from the inside of the paper tube so that the paper tube does not shift in the lateral direction and the rotation direction. Therefore, when fixing of the paper tube is insufficient, the paper tube is liable to slip in the lateral direction (paper width direction) or in the rotational direction to cause a print misalignment problem, and therefore improvement thereof has been demanded.

In recent years, the development of OA equipment has been remarkable, and various models have been commercialized one after another by equipment manufacturers. However, when fixing roll paper to the machine paper feed unit, it is placed inside the paper tube. As the winding fixing jig 50 to be inserted and set, there are a shaft type and a flange type as described later, and they are not unified. That is, the shaft type is a method of raising the chuck by the action of a spring to widen the outer diameter of the chuck portion 5d that comes into contact with the inner surface of the paper tube as shown in FIGS. There are a three-point chucking system in which chuck parts are provided at three points and a one-point chucking system in which a chuck part provided in the center of the shaft rises. In the flange type, as shown in FIG. 12, three chuck portions (sometimes referred to as claws) 5a to 5c are integrally formed on the flange, and after the claws are inserted inside the paper tube, they are brought into contact with the inner surface of the paper tube. It is a method to stop the paper core by expanding the outside diameter of the claw, which uses a screw or taper to expand the claw, and a metal stud (not shown) is embedded on the outer circumference of the claw to prevent the paper core from loosening. It is a method to stop. As described above, there are a plurality of types of winding and fixing jigs, and it is expected that various types of fixing methods will continue to appear in the future.

As described above, the paper tube is manufactured to have a substantially constant inner diameter size. After the winding and fixing jig, which is different depending on the model, is inserted and fixed, the paper tube is attached to the paper feeding section of each machine. Although I am using it, there are also two types of fixing jigs, shaft type and flange type, so if you use the wrong type of fixing jig, you can not insert it inside the paper core, On the contrary, even if it can be inserted, it cannot be put to practical use because the paper tube cannot be sufficiently fixed by the jig because it is loose. For this reason, handling of the user side is complicated when the roll paper is mounted on the paper feed section of each machine, and for the roll paper producer side, the specifications of the paper core are changed according to the model. However, the production efficiency is low, which is not preferable.

[0009]

SUMMARY OF THE INVENTION The inventor has found that even if there is a slight dimensional difference between the inner diameter of the paper tube and the outer diameter of the winding and fixing jig, the jig cannot be inserted or both of them can be fixed. As a result of extensive studies as to whether or not it can be easily done, the conventional paper tube had a flat inner surface as a whole and its inner surface was almost uniform. Focusing on the problem that it cannot be inserted into the tube or the jig cannot be fixed sufficiently, the conventional drawbacks are solved by making the inner peripheral surface of the paper tube uneven and devising the structure of the inner surface. It is how to find a method.

[0010]

That is, according to the present invention, in a cylindrical winding core of an information recording sheet, the inner peripheral surface of the core is partially roughened, and a fixing jig is attached to the inner peripheral surface. Has a first inner peripheral surface into which the chuck portion or the claw is inserted for frictional engagement, and an inner diameter smaller than the inner diameter of the first inner peripheral surface, and the chuck portion or the claw is frictionally engaged. A winding core characterized in that it is provided with a second inner peripheral surface to be fitted. The chuck part or claw of the fixing jig is inserted from the concave part formed on the inner peripheral surface of the paper tube, and then the jig is rotated to fix the convex part and the claw together.

The preferred construction of the present invention will be described in more detail with reference to the drawings. As shown in FIG. 1, the present invention uses a sheet 2 such as paper or a plastic film having a thickness of 150 to 400 microns as a core (paper tube). A first inner peripheral surface 7 to which the chuck portion or the claw of the fixing jig can frictionally engage, and the first core with respect to the outer diameter of the chuck portion or the claw. When the inner diameter of the inner peripheral surface 7 is large, the second inner peripheral surface 6 having an inner diameter smaller than that of the first inner peripheral surface 7 and frictionally engaged with the chuck portion or the claw is formed. It is a thing. The thickness of paper etc.
The reason for setting the thickness to 0 micron or more is that when using a paper thinner than that, it is difficult to stick when sticking to the inner peripheral surface of the core (paper tube) because the paper itself does not bend and is stiff. . Also, when thick paper exceeding 400 microns is used, the paper becomes difficult to bend, and similarly when it is attached to the inner peripheral surface of the core (paper tube), it easily fits along the curved surface of the cylindrical core. It becomes difficult to bend.

The paper 2 and the like attached to the inner peripheral surface of the core is
The fixing jig may be partially attached only at a portion contacting the chuck portion or the claw, but is continuously attached from a position near one end of the core to a position near an end on the opposite side of the core. It is also possible (see FIG. 2).

When the above-mentioned paper 2 or the like is stuck on the inner peripheral surface of the core, it is preferable to stick it so as to cover 60 to 80% in the circumferential direction. Place the paper 2 on the inner surface of the core 70 in the circumferential direction.
%, When the flange-type fixing jig is attached, two of the three chucks are always formed by the two papers forming the second inner peripheral surface 6. It rides on top of 2 and the chuck of the fixing jig and the core are securely fixed (see FIGS. 3 to 4).

According to the first aspect of the present invention, instead of sticking paper on the inner peripheral surface of the core, a groove is formed on the inner peripheral surface of the core so that the chuck portion or the claw of the fixing jig can be frictionally engaged. You may make it provide the inner peripheral surface 7 and the 2nd inner peripheral surface 6 which has an inner diameter smaller than the inner diameter of the said 1st inner peripheral surface, and which the said chuck part or a claw frictionally engages. . In the case of grooving the inner peripheral surface of the core, the mandrel may be pre-molded at the time of manufacturing the core, and the inner peripheral surface of the modeled core may be grooved so as to be damaged later. Regarding the shape of the groove, a linear groove may be provided along the axial direction of the core, or a spiral groove may be provided on the inner peripheral surface of the core.

The material of the winding core in the present invention is not limited to the paper tube, but may be made of plastic (for example, FRP core), and may be made of any material depending on the type and purpose of the paper.

[0016]

In any of the above-mentioned cores, by taking the above-mentioned solution means, the inner diameter and the outer shape of the jig must match the paper tube when the winding-fixing jig is inserted inside the core. Problems such as the inability to insert the jig and the inadequate fixing of the jig are almost completely eliminated.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, the present invention relates to a take-up core for an information recording sheet such as an information recording paper or a film used in an image printing apparatus. Sheets are the above-mentioned recording paper, film, output paper of OA equipment other than the above, punched tape paper, O
It is a concept including information related paper such as CR paper, OMR paper, MICR paper or magnetic recording base paper. The specifications (inner diameter and length) of the core are not limited to one kind, and for example, the length corresponds to so-called special A0 size to A3 size, and the core inner diameter is about 0.5 inch to 3 inches. There are some grades, and the configurations of the present invention can be applied to both types.

[0018]

EXAMPLE A first example of the present invention shown in FIGS. 1 to 4 will be described below. The winding core shown in the figure has an inner diameter of 3
Inside the inch paper core 1, the same color as the paper core, 220 g basis weight
/ M ² and 260 micron thick paperboard (kraft paper) 2
Is a case in which the double-sided tape 3 is applied so as to cover approximately 70% of the core in the circumferential direction while leaving non-adhesive portions having a width of about 5 mm at both ends of the core. The shaded portion in the figure is the portion where the double-sided tape 3 is attached.

As described above, in this embodiment, the paper 2 having a thickness of 260 microns is attached to the inner peripheral surface of the core, whereby the first inner peripheral surface 7 and the inner diameter of the first inner peripheral surface 7 are attached. The second inner peripheral surface 6 has an inner diameter smaller than that of the above and can be frictionally engaged with the chuck of the fixing jig. When the flange-type fixing jig 50 is attached to the paper tube 1 having the paper 2 attached thereto as described above, for example, as shown in FIG. 3 or 4, the jig can be easily inserted, and Of the three claws, the two claws 5b and 5c always ride on the paper 2 forming the first inner peripheral surface, and the fixing jig 50
Therefore, the paper tube 1 is securely fixed.

In the second embodiment shown in FIG. 5, in the inner circumferential surface of the FRP winding core having an inner diameter of 2 inches, at least the chuck width is widened and only the portion of the flange type fixing jig with which the chuck comes into contact. Attach the paper 2 and attach the second inner surface 6
Is the case that got.

The examples shown in FIGS. 6 and 7 are explanatory views showing a winding core corresponding to a shaft type fixing jig. FIG. 6 shows three places inside a paper tube having an inner diameter of 1 inch. This is an example in which the second inner peripheral surface is formed by attaching the paper 2 only to the portion of the shaft type fixing jig having the chuck portion in contact with the chuck portion. FIG. 7 shows a paper tube similar to that shown in FIG.
This is an example in which the second inner peripheral surface formed by adhering the paper 2 only to the portion where d contacts.

Further, in FIGS. 8 and 9, the first inner peripheral surface and the second inner peripheral surface are formed by forming a groove in advance on the inner peripheral surface of the core instead of attaching the paper. It is an example. Note that FIG. 8 shows an example in which linear grooves 8 are provided inside the FRP core (inner diameter 1 inch) at intervals of 120 degrees along the core axial direction, and FIG. 9 is a paper tube core (inner diameter 0.5. Inch shows the case where the spiral groove 9 is formed on the inner peripheral surface of the core.

[0023]

As described above, according to the present invention, the inner peripheral surface of the core is partially roughened, and the chuck portion or the claw of the fixing jig is inserted into the inner peripheral surface to frictionally engage the core. First to combine
Of the inner peripheral surface of the first inner peripheral surface and the second inner peripheral surface having an inner diameter smaller than the inner diameter of the first inner peripheral surface and with which the chuck portion or the claw is frictionally engaged, so that it is wound inside the core. When inserting the fixing jig, if the inner diameter and the outer shape of the jig do not match the paper tube, the jig cannot be inserted and the jig cannot be fixed sufficiently.

It is expected that various types of fixing jigs for the winding core will appear in the future.
This can be achieved by simply sticking paper at a predetermined position on the inner surface of the core or by simply making a groove, and by adopting the configuration of the present invention, the usable range of the winding core can be expanded. It will increase your sexuality.

Further, conventionally, when a jig cannot be inserted, or the jig cannot be fixed sufficiently, a roll paper is used.
Wasted wasted, but as described above, it can be used just by pasting paper on the inner surface of the core or forming a groove, so it is not wasteful, it is an excellent effect in terms of resource saving and global environmental protection Have.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing an embodiment of a winding core according to the present invention.

FIG. 2 is a schematic view of a paper attached to the inner surface of the core in the same example.

FIG. 3 is an explanatory view showing an example of an engagement relationship between the core and the claw of the fixing jig in the same embodiment.

FIG. 4 is an explanatory view showing an example of the engagement relationship between the core and the claw of the fixing jig.

FIG. 5 is a partial perspective view showing a second embodiment of the winding core according to the present invention.

FIG. 6 is a partial perspective view showing a third embodiment of the winding core according to the present invention.

FIG. 7 is a partial perspective view showing a winding core according to a fourth embodiment of the present invention.

FIG. 8 is a partial perspective view showing a fifth embodiment of the winding core according to the present invention.

FIG. 9 is a partial perspective view showing a sixth embodiment of the winding core according to the present invention.

FIG. 10 is a perspective view showing an example of a shaft type fixing jig used in the present invention.

FIG. 11 is a partial explanatory view of a chuck portion of a shaft type fixing jig which is also used in the present invention.

FIG. 12 is a perspective view showing an example of a flange type fixing jig used in the present invention.

[Explanation of symbols]

1 paper tube 2 Paperboard (craft paper) 5a-5c Claw (chuck) 5d chuck part 6 Second inner surface 7 First inner surface 50 Fixing jig

Claims (3)

[Claims] 1. A cylindrical winding core for an information recording sheet such as paper or film, wherein the inner peripheral surface of the core is partially roughened to form a chuck portion of a fixing jig on the inner peripheral surface. Or insert a claw to frictionally engage the first
An inner peripheral surface (7) and a second inner peripheral surface (6) having an inner diameter smaller than that of the first inner peripheral surface and frictionally engaged with the chuck portion or the claw. A winding core that is characterized by that. 2. A first inner peripheral surface (7) and an inner diameter of the first inner peripheral surface are obtained by attaching a sheet of paper, plastic film or the like having a thickness of 150 to 400 microns to the inner peripheral surface of the core. The winding core according to claim 1, further comprising a second inner peripheral surface (6) having a smaller inner diameter and frictionally engaging with the chuck portion or the claw. 3. A linear groove or a spiral groove is formed on the inner peripheral surface of the core during the manufacturing of the core, so that the chuck portion or the claw of the fixing jig is inserted into the inner peripheral surface to cause friction. First inner peripheral surface (7) to be engaged mechanically, and a second inner peripheral surface having an inner diameter smaller than the inner diameter of the first inner peripheral surface and with which the chuck portion or the claw is frictionally engaged. Winding core according to claim 1, characterized in that it is provided with a surface (6).