JPS5831846A - Reel shaft - Google Patents

Abstract

PURPOSE:To eliminate the necessity for a reel paper tube, in a pressure air- introducing external diameter-variable reel shaft for an electronic table computer and the like, by constituting the shaft such that a rigid case unit, uniformly having holes or gaps fully in the periphery, is enveloped to the outside of an elastic cylindrical bag unit and the bag unit can be expanded. CONSTITUTION:A cap 19 is removed, and air at pressure of about 4-5kg/cm<2> G is introduced to an air introducing groove 12 from a check valve 17 and sealed. The pressurized air enters between a rubber tube 20 and core shaft 11 against contractible force of the rubber tube 20 and heat shrinking plastic tube 22 to form a thin layer on a surface of the core shaft 11. In this way, the rubber tube 20 is expanded to a part of small hole 23 in the periphery of the plastic tube 22 and protruded to a semispherical shape. Under this condition, paper is directly wound. After the paper is wound, the check valve 17 is operated to evacuate internal pressure, contract the rubber tube 20 and remove the wound paper from a reel shaft. In this constitution, the paper can be wound without causing the necessity for using a paper tube.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a winding shaft K11m capable of directly winding paper used in registers, desktop calculators, etc., without passing through a paper tube.

Conventionally, paper tubes (1) used in registers, desktop calculators, etc. are inserted into the winding shaft and fixed concentrically with a paper tube holder, as shown in Figure 1, which are arranged in parallel. The paper (for example, slit paper) (3) to be wound up is passed in an inverted figure-eight shape between the paper tube (1) and the drive roller (0), and is tacked. Then, attach the presser roller (4) directly above the paper tube (1) so as to lightly press it through the paper, and then
When the rollers are driven in the direction of the arrow at the same circumferential speed, the presser roller is moved upward as the diameter of one roll increases. In this case, since the winding is carried out exclusively by a surface drive and not by a central drive, the winding shaft only needs to serve to position the paper tube. Radial positioning is done by a paper tube holder engaged with the take-up shaft, and axial positioning is done by a thruster made of steel balls housed in center holes at both ends of the take-up shaft and seats for the steel balls. It is done by receiving.

The weight of the paper to be wound up is determined by a pair of drive rollers (2
)K, and does not act on the winding shaft at all,
Furthermore, as described above, the single take-up shaft does not need to transmit the winding torque υ or bear the tension from the paper (3), so it can be made sufficiently thin.

On the other hand, a paper tube is a single piece of paper that has been wound up to a predetermined size.
In order to be able to easily remove the paper from the winding shaft, it is necessary to have sufficient strength to resist the tightening caused by the tension from the paper during winding and to prevent deformation. necessary, and therefore its outer diameter should be set to, for example, 1
It is difficult to make it smaller than about 3ff.

By the way, sheets of paper that are installed in registers, desktop calculators, etc., are generally used with a winding diameter of about 50 to 7 Off. For such small rolls of paper, even paper tubes with the thickness mentioned above are too large, and as the demand for small rolls of paper increases, so-called coreless roll paper that does not use paper tubes is required. The current situation is that

As mentioned above, the thickness of the winding shaft can be made sufficiently thin, so if paper can be wound directly onto the winding shaft and the product can be easily removed from the winding shaft after winding a fixed length. In response to the above-mentioned demand, the present invention provides a novel winding-up shaft that meets the above-mentioned demand in a variable-outer-diameter winding shaft designed to introduce pressurized air into the interior of the elastic cylindrical bag. , the bag is covered with a rigid mantle having holes or gaps evenly distributed over the entire circumference to partially allow expansion of the bag, and pressurized air is introduced into the cylindrical bag and sealed; 'L is uniformly bulged out through the holes and gaps in the rigid bag, and then the material is wound up. After the material has been wound, the air enclosed in the cylindrical body is released, and the cylindrical bag is It is attached to the winding shaft, which allows the body to contract and restore its shape, and then removes the material that has been wound up.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Figure 2 shows a side cross section of the left end and part of the paper winding section of the embodiment shown in Fig. 2, and Figure S shows a side cross section of the right end and part of the paper winding section. FIG. 4 is an enlarged sectional view of the ff-fV section of FIG. 2 taken in the direction of the arrow, and FIG. 5 is an enlarged partial side view of the paper winding section. In the figure (B) is the core shaft, which is made of a drill rod with a diameter of, for example, 81 mm, and has a pair of keyway-shaped air introduction grooves on its outer periphery, a diametrical air introduction hole connected to it, and electrical conduction with it. An air introduction path α→ is provided at the axis, and is connected to the joint by a threaded portion at its left end, and its right end is formed into a hemispherical thrust portion. A check valve such as a Paul Cheraffe valve Q7) is attached to the end of the joint (2), and an air introduction passage 08 is opened at its axis to connect to the air introduction passage (b) with a core axis of 0υ. . Ql is a cap having a hemispherical tip, and is screwed to the joint (G).

The tube is a rubber tube, for example, with an inner diameter of 7ff and a wall thickness of 1.5 mm.
About ml is placed on the core shaft 01) with an outer diameter of 8M as described above.
The air-introducing tube is covered in a hermetically sealed manner, and both ends of the tube are tied together in a coiled manner with piano wire or the like and fixed airtightly. The part of the core shaft aυ covered with this rubber tube is the winding S (which occupies most of the winding shaft)
b), and its length is long, for example 900M. Therefore, it is troublesome to put the rubber tube (A) over the core shaft (2) while squeezing it, but insert the thrust part α of the core shaft (B) into one end of the rubber tube (E), and then press the other end. By blowing pressurized air into the tube, the rubber tube (e) will expand, so you can easily cover it with the core shaft (b). It is fixed in place by covering it with a plastic chaser, such as a tube of crosslinked polyolefin, and then heating it to heat shrink it. Then, use a material whose thickness in the contracted state is, for example, about α6H.

In addition, small holes having a hole diameter of about 3M in the contracted state are arranged in a staggered pattern with a pitch of about 10m1 and a phase difference of 180#. This small hole is processed in advance using a yato before covering with a heat-shrinkable chain.

Next, the operation of this embodiment will be explained. This winding shaft is installed in the surface-driven winding device shown in FIG. 1. Prior to this, the cap is removed and the check valve Pressurized air of about 4 to 5#/dG is introduced from the air introduction groove (LIK) through the air introduction path (7), (B), and the air introduction hole (to) and is sealed. Air introduction groove (B) K The enclosed pressurized air enters into a wedge shape between the rubber tube (E) and the core shaft (B) against the contraction force of the rubber tube (E) and the heat-shrinkable plastic tube (2). Then, it spreads in a thin layer uniformly over the surface of the core shaft (B) except for the airtightly bound parts at both ends.The heat-shrinkable plastic tube (E) is applied from this pressurized air. It has enough strength to withstand internal pressure, so it hardly expands, but since this backup is not provided at the small hole (2), the rubber tube (hole 2) cannot be connected to any of the small holes. ) expands evenly due to the internal pressure and rises in a hemispherical shape. By filling the pressurized air in this way, a hemispherical mound is evenly distributed in the winding part @. Form and heat shrink plastic tubing (2
) should be about 2 fi thicker than the outside diameter of the part where the paper to be wound comes into contact with.

After completing the above preparation operations, this winding shaft with the cap (6) attached again is attached to the surface drive type winding device shown in Fig. 1, and paper is directly inserted into the winding section of the conventional paper tube. Tuck it in the same way as before and wind it to the specified length.

The hemispherical raised area of the rubber tube 4 is compressed to some extent by the winding tightening K caused by the tension from the paper during winding, but the amount is small, and stable winding can be performed and the The paper can be wound at a constant extreme pressure with the shaku winder υ, and the paper does not come into direct contact with the heat-shrinkable plastic tube. Therefore, remove the winding shaft together with the wound product from the winding device, and remove the cap (6
), screw in the holed plug at the tip of the check valve υ, push in the pole to release the enclosed pressurized air from the check valve (b), and shrink and restore the rubber tube (e). The product can be removed at any time.

In the above explanation, a core shaft (B) with a diameter of K8m was used, but if an even thinner core shaft is used, a winding shaft with a hole diameter of about 6W left in the center of a small rolled product can be created. It is also possible. Further, the air introduction groove (2) may be formed into a spiral shape instead of a key groove shape.

Furthermore, in the embodiment described above, the rubber tube 4 is connected to a small hole (
(to) is covered with a heat-shrinkable plastic tube (2) arranged symmetrically, and a narrow heat-shrinkable plastic tape is applied to the end of the tape (to) to Fix it and wrap it in a spiral shape, and then either create a gap between the tapes that is the same width as the tape, or use heat-shrinkable plastic tubes that are cut short to the same length and placed at equal intervals, for example, with the same width. It is also possible to overlap a large number of rubber tubes with increasing gaps, and to uniformly bulge the rubber tubes 4 from these gaps.

As is clear from the above description, in the winding shaft according to the present invention, elastic cylindrical bags (for example, rubber tube embankments) are formed in the winding part so as to be evenly distributed, and the slits are formed in the winding shaft. Winding paper and other materials such as paper are brought into contact with each other, and winding is performed between the windings t7. Since the embankment second portion sufficiently opposes K and hardly causes deformation, stable winding can be performed and it is possible to wind into a constant shape by winding to a fixed length. In addition, the product can be easily removed by releasing the enclosed pressurized air from the winding shaft after winding is completed, making coreless winding possible without the need for a paper tube. be. Further, when a rigid sleeve made of a heat-shrinkable synthetic resin material is used to back up the elastic cylindrical bag that encloses pressurized air and restrain its expansion, the winding shaft can be easily assembled.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing a state in which paper is wound by a surface drive type winding device using a winding shaft using a conventional paper tube, and FIG. 2 is a left end of the embodiment according to the present invention. FIG. FIG. 5 is an enlarged cross-sectional view of the ff-4 section in FIG. 2 taken in the direction of the arrow, and FIG. 5 is an enlarged partial side view of the paper winding section. Oυ・- Core shaft, (B) - Air introduction groove (B)
・-Air introduction hole, (b)...Air introduction path αη-
・Check valve (ball check valve) (to) - Air introduction path ■...Rubber tube (elastic cylindrical bag) - Heat-shrinkable plastic tube (rigid jacket) - Small hole: Agent Patent Attorney Manabu Kitamura 1/Suggestion 1 Illustration

Claims (1)

[Scope of Claims] (1) A variable outer diameter winding shaft in which the winding shaft is airtightly covered with a cylindrical bag made of an elastic material, and pressurized air is introduced into the bag; Outside of elastic cylindrical bag @
and a winding shaft which is covered with a rigid sleeve having holes or gaps evenly distributed over the entire circumference to partially allow the expansion of the bag. 2. The winding shaft according to claim 1, wherein the rigid sleeve is made of a heat-shrinkable synthetic resin material.