JP2514603Y2 - Fixed shaft for winding tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fixed shaft for a winding tube.

(Prior Art) For example, as shown in FIG. 1, when a winding tube 2 around which a sheet 1 is wound is to be rotated in order to pay out the sheet 1, the winding tube 2 is attached to a rotary machine. The winding tube 2 is rotated by fixing to a possible shaft and rotating the shaft 3 by a rotary machine.

As the fixed shaft 3 for fixing such a winding tube 2, there is used one in which a plurality of claws 4 are provided on the circumference thereof and which can be moved back and forth along the radial direction of the fixed shaft main body 5.

That is, by advancing the claw 4 toward the outside, it is pressed against the inner surface of the winding tube 2, and the fixed shaft 3 and the winding tube 2 are mechanically integrated via the claw 4.

FIG. 3 shows a conventional fixed shaft 3, which is a fixed shaft main body 5.
A balloon 31 made of rubber is arranged inside the hollow, and a plurality of claws 4 are attached to the outer circumference thereof. Claw 4 is fixed shaft body 5
It is extracted to the outside through a hole 6 formed in the periphery of.

In order to fix the winding tube 2 using the fixed shaft 3 having such a structure, the fixed shaft 2 is inserted into the winding tube 2 as shown in FIG. Compressed air is sent from 7.

Then, the balloon 31 is inflated, and along with this inflation, the nail 4
Project outside from the peripheral side surface of the fixed shaft body 5. Due to this protrusion, the tip of the claw 4 comes into contact with the inner surface of the winding tube 2. As a result, the winding tube 2 is mechanically integrated with the fixed shaft 3 via the claw 4.

(Problem to be solved by the invention) However, according to such a configuration, since the balloon 31 is used, when the balloon 31 is not inflated, the balloon 31 hangs downward. Therefore, when it expands, the claws 4 arranged along the circumferential direction of the fixed shaft 3 cannot be pushed out by the same amount with respect to the axial center of the fixed shaft 3.

Therefore, the winding tube 2 is fixed to the fixed shaft 3 in a state where the axis of the winding tube 2 and the axis of the fixed shaft 3 do not match. With this, when the fixed shaft 3 is rotated, the winding tube 2 is eccentrically rotated, and irregular tension acts on the sheet fed from the winding tube 2.

An object of the present invention is to fix the winding tube to a fixed shaft such that the shaft centers of the two can be accurately matched.

(Means for Solving the Problem) The present invention is directed to a fixed shaft main body that is inserted into a winding tube,
A taper piston provided inside the fixed shaft main body so as to be slid in conformity with the axis of the fixed shaft main body, and an inner surface of the winding tube abutting on a peripheral side surface of the taper piston and sliding by the taper piston. Between a plurality of claws arranged to move the same amount from the axis of the fixed shaft main body so that the tip contacts the inner surface of the winding tube, and between the fixed shaft main body and the taper piston opposed to each other. And a spring that biases each of the opposed tapered pistons toward the initial position, and slides each of the opposed tapered pistons inside the fixed shaft body against the biasing force of the spring by compressed air. Characterized by being free.

(Operation) When fixing the winding tube, the fixed shaft for a winding tube having the above-mentioned characteristics is configured such that the fixed shaft body is fitted and inserted into the winding tube, compressed air is fed into the fixed shaft body, and slides inside the fixed shaft body. The tapered pistons, which are freely movable, are slid so that their axial centers coincide with each other, and the tapered pistons provided opposite to each other inside the fixed shaft body are slid. By sliding each taper piston, it is brought into contact with the peripheral side surface of each taper piston, and all the claws arranged in the circumferential direction are respectively slid against the inner surface of the winding tube by the sliding of each taper piston. The same amount is pushed out from the shaft center of the fixed shaft body. As a result, the winding tube and the fixed shaft can be integrated in a state where the axes of both are aligned.

Further, when releasing the fixation of the winding tube, if the compressed air inside the fixed shaft main body is removed, the unification of the winding tube and the fixed shaft can be released immediately due to the action of the spring.

(Embodiment) An embodiment of the present invention will be described with reference to FIG. In addition, the same reference numerals as those in FIG. 3 indicate the same or corresponding portions. According to this invention, the taper pistons 8 are slidably arranged inside the fixed shaft body 5 so as to face each other. Then, it is driven by compressed air or the like sent from the inlet 7.

The example shown in the figure illustrates a configuration in which two tapered pistons 8 are arranged in pairs, and one through hole 9 is provided in one of the tapered pistons 8 that are arranged opposite to each other, and compressed air from the inlet 7 is provided in the through hole 9. Is supplied to the back surface of both taper pistons 8 via. By this supply, both taper pistons 8 are driven in opposite directions.

The inner end of the claw 4 is in contact with the peripheral side surface of each taper piston 8. Then, each claw 4 is led out to the outside through a hole 6 provided on the peripheral side of the fixed shaft body 5.

Reference numeral 11 is a spring for returning each taper piston 8, which quickly returns each taper piston 8 slid by compressed air to the initial position when the compressed air is removed. Reference numeral 12 is a spring (for example, a leaf spring) for returning the claw 4 pushed outward.

The taper piston 8 is arranged in the fixed shaft main body 5 such that its axis coincides with that of the fixed shaft main body 5. Here, when each taper piston 8 is driven against the biasing force of the spring 11 for return by the compressed air supplied from the inlet 7, the pawls arranged in the circumferential direction that abut on each taper piston 8 respectively. 4 are pushed out toward the outside by the same amount, and the claws 4 arranged between the claws 4 in contact with the respective taper pistons 8, that is, the claws 4 arranged along the axial direction are
An amount corresponding to the inner diameter of the winding tube is extruded into each.

By this extrusion, the tips of the claws 4 come into contact with the inner surface of the winding tube 2 and the fixed shaft 3 and the winding tube 2 are mechanically integrated, as in the conventional configuration.

In this case, since the protrusion amounts of the claws 4 in the circumferential direction are all the same, the winding tube 2 is fixed with the axis of the fixed shaft 3 and the axis of the winding tube 2 aligned. Further, since each taper piston 8 is slid by the air pressure and the claws 4 are pushed out, a quick and uniform force is applied to all the claws 4,
Moreover, the claw 4 and the winding tube 2 can be brought into contact with each other with a large force.

(Effects of the Invention) As described in detail above, according to the present invention, when the winding tube is fixed to the fixed shaft, it is possible to fix the two tubes in a state in which both shaft centers are surely aligned with each other, and the claw is fast and strong. It can be pressed against the winding tube, and when removing the winding tube from the fixed shaft, the return spring can immediately release the unification of the winding tube and the fixed shaft, and the claw can be taken in and out in a short time. There is an effect that can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a transverse sectional view showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a part thereof, and FIG. 3 is a transverse sectional view of a conventional example. 2 ... Winding tube, 3 ... Fixed shaft, 4 ... Claw, 5 ... Fixed shaft body, 8 ... Tapered piston,

Claims (1)

(57) [Scope of utility model registration request] 1. A fixed shaft main body inserted into the inside of a winding tube, a taper piston provided opposite to the inside of the fixed shaft main body and sliding in conformity with the axis of the fixed shaft main body, and the taper piston. A plurality of sliders arranged so as to be in contact with the circumferential side surface of the winding tube and to move by the same amount from the axial center of the fixed shaft main body with respect to the inner surface of the winding tube by the sliding of the taper piston so that the tip end contacts the inner surface of the winding tube The pawl and a spring arranged between the fixed shaft body and the opposed tapered piston to urge each of the opposed tapered pistons toward the initial position, and each of the opposed tapered pistons are fixed to each other. A fixed shaft for a winding tube which is slidable inside the shaft body by compressed air against the biasing force of the spring.