JP3911488B2 - Roll paper holder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a roll paper holding member used for roll paper used in an image forming apparatus such as a copying machine, a facsimile machine, and a printer.
[0002]
[Prior art]
In an image forming apparatus typified by a copying machine or a facsimile, a toner image formed on an image carrier (photoreceptor) is transferred to transfer paper by electrophotography, and the transferred toner image is transferred by heat and pressure. An image is formed by fixing on the paper surface. There is a type of apparatus in which such transfer paper is loaded in the apparatus in the form of so-called roll paper and supplied to the transfer process and the fixing process. In particular, many of these roll papers are used in business image forming apparatuses for forming images on large-size paper such as A1 and household facsimiles.
[0003]
The roll paper as described above is obtained by winding a transfer paper around a paper tube (made of paper or synthetic resin) and supplying it to a predetermined image forming process (transfer and fixing process) while pulling the rolled transfer paper. After the image formation is completed, the paper is cut by a cutter and discharged outside the apparatus. Therefore, it is necessary to hold the roll paper in the apparatus so that the roll paper can be rotated and does not sway in the width direction and can be wound up. For this reason, an appropriate roll holding member is provided at the end of the paper tube. Is inserted (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-80978
[Problems to be solved by the invention]
The roll holding member of Patent Document 1 includes an annular flange member (19) and a stopper (17) with a lock lever (23) inserted into the flange member. When the stopper (17) is pressed by the roll paper tube by operating (23), the flange member (19) and the roll paper tube are fixed.
[0006]
However, there is a problem that the inner diameter of the roll paper tube is slightly different in size from manufacturer to manufacturer or from country to country, and it is difficult for the roll holding member as in Patent Document 1 to effectively cope with such a change in size. It is. For example, when the inner diameter of the paper tube is small, it is difficult to set the lock lever. When the inner diameter of the paper tube is large, the lock becomes insufficient, and the annular flange member cannot be stably held, and the roll paper The winding of is unstable.
[0007]
Accordingly, an object of the present invention is a roll paper that can cope with a change in the inner diameter of the roll paper tube, is always stably held by the roll paper tube, and can stably and reliably wind up the roll paper. It is to provide a holding tool.
[0008]
[Means for Solving the Problems]
According to the present invention, the annular holding member that is held at the end of the paper tube on which the roll paper is wound, and the lock member that is provided so as to be rotatable relative to the annular holding member. The holding member includes a hollow cylindrical portion that is fitted into an end portion of the paper tube, and a ring-shaped substrate that extends outward from one end of the cylindrical portion, and the lock member has a larger diameter than the hollow cylindrical portion. A head substrate, a cylindrical portion fitted into the hollow cylindrical portion, and a coil spring provided on the inner surface of the cylindrical portion and having a tip pressed against the inner surface of the paper tube , A position fixing portion that protrudes to the inner surface side of the paper tube is provided, and the elasticity of the coil spring is extended so as to expand the inner surface of the paper tube by rotating the lock member in a direction in which the coil diameter of the coil spring increases. roll paper force and wherein the acts held There is provided.
[0009]
In the present invention,
1. A circumferential flange extending in the direction opposite to the hollow cylinder portion is formed on the peripheral edge of the ring-shaped substrate, and the inner surface of the circumferential flange is formed by repeating the concave and convex portions over the entire circumference. A wavy engagement portion is formed, and an engagement portion that engages with the wavy engagement portion is formed on the outer peripheral surface of the head substrate of the lock member. The locking member is provided so as to be able to rotate stepwise with respect to the annular holding member by engagement with a portion;
2. A plurality of ribs extending in the axial direction are formed on the outer peripheral surface of the hollow cylindrical portion at intervals in the circumferential direction.
3. By rotating the lock member in a direction in which the coil diameter of the coil spring is increased, the elastic force of the coil spring acts to expand the hollow cylindrical portion of the annular holding member;
Is preferred.
[0010]
In the present invention, the annular holding member can be stably held with respect to the roll paper by fitting the annular holding member into the paper tube in a state where the lock member including the coil spring is inserted. That is, the coil spring provided in the lock member expands by rotating the lock member in a predetermined direction, and its diameter increases, and if it rotates in the opposite direction, it contracts and its diameter decreases. That is, since the diameter of the coil spring can be changed according to the diameter of the roll paper tube, the lock member can always be stably held and fixed to the roll paper tube regardless of the diameter of the roll paper tube. Therefore, such a lock member makes it possible to stably and firmly hold the annular flange member on the roll paper tube.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below based on specific examples shown in the accompanying drawings.
FIG. 1 is a side sectional view showing a roll paper holder of the present invention together with a roll paper tube,
FIG. 2 is a front view of the roll holder of FIG.
FIG. 3 is a rear view of the annular holding member in the roll holder of FIG.
FIG. 4 is a diagram showing an example of the tip shape of the coil spring.
FIG. 5 is a side sectional view showing another example of the roll holder of the present invention.
[0012]
1 to 3, this roll-shaped holding tool is composed of an annular holding member indicated by 1 as a whole and a locking member indicated by 2 as a whole, and is provided at the end of the paper tube 4 around which the roll paper 3 is wound. It is held and fixed.
[0013]
The annular holding member 1 includes a hollow cylindrical portion 5 that is fitted into an end portion of the paper tube 4 and a ring-shaped substrate 6 that spreads outward from one end of the hollow cylindrical portion 5. In addition, a circumferential flange 7 extending on the opposite side of the hollow cylindrical portion 5 is provided on the peripheral edge of the ring-shaped substrate 6 over the entire circumference.
[0014]
As shown in FIG. 3, a plurality of ribs 5a extending in the axial direction can be formed on the outer surface of the hollow cylindrical portion 5 at appropriate intervals, whereby the hollow cylindrical portion 5 is tight. And can be fixed inside the paper tube 4. Moreover, when such a rib 5a is provided, the shape of the hollow cylindrical portion 5 can be a shape other than a circle.
[0015]
Further, as shown in FIG. 2, a corrugated engagement portion 8 is formed on the entire inner surface of the circumferential flange 7 provided on the periphery of the ring-shaped substrate 6. That is, the waveform engaging portion 8 is formed by repetition of the concave portion 8a and the convex portion 8b. The corrugated engagement portion 8 is provided to rotate the lock member 2 stepwise.
[0016]
The lock member 2 has a circular head substrate 10 having a diameter larger than that of the hollow cylindrical portion 5. A cylindrical portion 11 is formed on the inner surface of the head substrate 10, and the cylindrical portion 11 is annular. The holding member 1 is fitted into the hollow cylindrical portion 5 (see FIG. 1). Further, a coil spring 12 is attached to the cylindrical portion 11, and this coil spring 12 is inserted into the paper tube 4, and its tip 12 a is pressed against the inner surface of the paper tube 4. . That is, the coil spring 12 can be easily inserted into the paper tube 4 regardless of the inner diameter of the paper tube 4, and the head substrate 10 is formed by the tip 12 a being pressed against the inner surface of the paper tube 4. It is designed to be positioned.
[0017]
In addition, in order to crimp the tip 12a of the coil spring 12 to the inner surface of the paper tube 4 and to fix the position firmly, for example, as shown in FIG. The tip 12a is preferably brought into surface contact with the inner surface of the paper tube 4 (see FIG. 4A), or a rubber-like elastic member 13 is preferably provided at the tip 12a (see FIG. 4). 4 (b)).
[0018]
On the other hand, as shown in FIG. 2, a knob 15 is provided on the outer surface of the head substrate 10, and a protrusion 16 is provided on the outer peripheral surface of the head substrate 10. That is, the protrusion 16 is engaged with the concave portion 8a of the corrugated engagement portion 8 formed on the inner surface of the circumferential flange 7 of the annular holding member 1 described above. The annular holding member 1 fitted to the paper tube 4 can be rotated stepwise.
[0019]
That is, by holding the knob 15 and rotating the head substrate 10 of the lock member 2 stepwise in, for example, the direction D in FIG. 1, the coil spring 12 expands (the coil diameter increases), and the coil spring 12 The whole is pressed against the inner surface of the paper tube 4, whereby the lock member 2 is firmly fixed, and the annular holding member 1 can be firmly rotated with the paper tube 4 by the lock member 2. 4 is held. When the head substrate 10 is rotated in the direction opposite to the D direction, the coil diameter of the coil spring 12 is reduced, so that the lock member 2 can be quickly pulled out from the paper tube 4.
[0020]
In the present invention, the annular holding member 1 can be directly held by an elastic force by the coil spring 12. An example of this is shown in FIG.
[0021]
That is, in FIG. 5, the cylindrical portion 11 provided on the inner surface of the head substrate 10 is formed in a thin flat shape, and the coil spring 12 passes through the inside of the hollow cylindrical portion 5 of the annular holding member 1. It extends inside the tube 4. Therefore, by rotating the head substrate 10 stepwise in the D direction, the coil spring 12 expands in diameter, and the elastic force of the coil spring 12 acts to push the hollow cylindrical portion 5 apart. As a result, the hollow cylindrical portion 5 is pressed against the inner surface of the paper tube 4, and the annular holding member 1 is more firmly held between the paper tube 4 and the lock member 2.
[0022]
【The invention's effect】
Thus, in the roll paper holder of the present invention, since the annular holding member is held on the paper tube 4 using the lock member provided with the coil spring, the inner diameter of the paper tube 4 is not affected by the size of the inner diameter. The annular holding member can be stably held at the end of the paper tube 4, and for example, the roll paper wound around the paper tube 4 can be stably rewound by rotating the annular holding member. it can.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a roll paper holder of the present invention together with a roll paper tube.
2 is a front view of the roll holder of FIG. 1. FIG.
3 is a rear view of an annular holding member in the roll holder of FIG. 1. FIG.
FIG. 4 is a diagram showing an example of a tip shape of a coil spring.
FIG. 5 is a side sectional view showing another example of the roll holder of the present invention.
[Explanation of symbols]
1: annular holding member 2: lock member 3: roll paper 4: paper tube 5: hollow cylindrical portion 6: ring-shaped substrate 7: circumferential flange 8: corrugated engagement portion 10: head substrate 11: columnar portion 12: coil spring

Claims (4)

An annular holding member that is held at the end of a paper tube on which roll paper is wound, and a lock member that is rotatably provided relative to the annular holding member. a hollow cylindrical portion to be fitted in the end portion of the tube, and a ring-shaped substrate that has spread outward from one end of the tubular portion, the locking member includes a head substrate having a large diameter than the hollow cylindrical portion, wherein A cylindrical portion that is fitted inside the hollow cylindrical portion; and a coil spring that is provided on the inner surface of the cylindrical portion and has a tip that is crimped to the inner surface of the paper tube. Protruding position fixing portions are provided, and by rotating the lock member in a direction in which the coil diameter of the coil spring is increased, the elastic force of the coil spring acts to spread the inner surface of the paper tube. A roll paper holder.   A circumferential flange extending in the direction opposite to the hollow cylinder portion is formed on the peripheral edge of the ring-shaped substrate, and the inner surface of the circumferential flange is formed by repeating the concave and convex portions over the entire circumference. A wavy engagement portion is formed, and an engagement portion that engages with the wavy engagement portion is formed on the outer peripheral surface of the head substrate of the lock member. The roll paper holder according to claim 1, wherein the lock member is provided so as to be able to rotate stepwise with respect to the annular holding member by engagement with a portion. The roll holder according to claim 1 or 2 , wherein a plurality of ribs extending in the axial direction are formed on the outer peripheral surface of the hollow cylindrical portion at intervals in the circumferential direction. The elastic force of the coil spring acts so as to expand the hollow cylindrical portion of the annular holding member by rotating the lock member in a direction in which the coil diameter of the coil spring is increased. The roll holder described.

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