JPH0452210Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a structure for sandwiching a roll body for winding paper, film, etc. so that it can be attached and detached by moving the support shaft from both ends, and the roll body and the support shaft are The present invention relates to a structure of a roll support shaft that is firmly engaged and does not slip.

[Conventional technology]

The structure of a roll support shaft conventionally used, for example, in a brake cylinder is shown in FIG.

FIG. 5 is a front sectional view of the main part showing an example of the structure in which the roll support shaft is attached, and is a front sectional view of the roll body 1'.
are held by inserting cone shafts 10, 10' in the shape of a truncated cone from both ends.

The roll body 1' has a core tube 1' having a collar 1'a.
b, and a sheet 1'c made by winding paper, film, etc. around this core tube 1'b. In addition,
11 is a bearing for ensuring the axis of rotation of the cone shafts 10, 10', 12 is a disc, 13 is a brake for the disc 12, 14 is a sleeve bearing, 15
is a piston.

In the structure of the roll support shaft formed as described above, when removing the shaft, a support lifter (hereinafter simply referred to as a lifter) is raised from the lower part of the roll body 1' in advance, and lightly abuts against the lower part of the roll body 1'. (not shown) so that it can receive the weight. and,
The piston 15 moves the cone shaft 10' to the right. This moving distance is the cone shaft 10, 1 at both ends.
0' is longer than the length inserted into the roll body 1' .

When the right cone shaft 10' is removed in this way,
The right half of the weight of the roll body 1' is received by the lifter.
In this state, when the roll body 1' is pushed axially to the right by hand, the lifter has a rolling bearing that can move in the axial direction, so the roll body 1' easily moves to the right and moves away from the cone shaft 10'. Will be removed.

At the time of insertion, the roll body 1' mounted on the lifter is stopped in advance so as to be approximately aligned with the axes of the cone shafts 10, 10', and the cone shaft 10' is moved by the reverse action of the piston 15 mentioned above. Move to the left.

[Problem that the invention attempts to solve]

However, the structure of the roll support shaft having such a configuration has the following problems.

(1) In general, the collar 1'a is made by pressing metal, so the accuracy and roundness of the inner diameter are not very good. The method of fixing this collar metal 1'a to the core tube 1'b is to make cross marks in multiple places on the collar metal 1'a, insert it into the inside of the core tube 1'b, and then
Press with a jig or the like from the upper part of the marked part to bite the part marked with X into the core tube 1'b. Since the material of the core tube 1'b is generally cardboard, it is not firmly fixed to the collar 1'a.

In such a state, the cone shafts 10,1
0' can be inserted smoothly and torque can be transmitted with less force by making the taper of the conical part of the cone shafts 10, 10' extremely gentle. The cone shafts 10 and 10' are forcibly dug into the metal 1'a, so when the cone shafts 10 and 10' are removed, the collar 1'a
is attracted to the conical part side and comes off from the core tube 1'b,
It becomes extremely difficult to remove this collar 1'a from the cone shafts 10, 10', so a steep taper is provided in the conical portion.

When such an object is inserted into the collar 1'a, the axis of the roll body 1' is not completely concentric just before insertion, so there is a force that moves the weight of the roll body 1' concentrically. For example, if the diameter and length are 1 m, the force is approximately 800 kg, which is an extremely large force, and since the axis is eccentric, this force acts on a single point. However, since the material of the core tube 1'b supporting the collar 1'a is cardboard, distortion occurs and the core tube 1'b is inserted bent in the direction in which the force is applied. As a result, the concentricity of the shaft core is impaired, and the shaft rotates with eccentricity, resulting in vibration. Further, when the roll body 1' is removed, the collar 1'a gets stuck to the cone shafts 10, 10', making removal extremely difficult.

(2) Since the slope of the conical part is steep, the component force acting on the inner diameter of the collar 1'a due to the axial thrust is small.
A large thrust is required to obtain the required transmitted torque. This, together with the increase in power, causes this axial thrust to act on the bearings 11, 11' when the roll body 1' rotates, causing problems in terms of lubrication, lifespan, etc.

(3) Although not shown, even in a general roll body, the paper tube and the support shaft are not firmly engaged, so that unnecessary torque transmission may occur.

The inventors of this application proposed these improvements in 1988.
In the application for utility model registration dated March 9, 2017, ``Structure of roll support shaft'' states that ``at least three or more places are formed on the outer circumference of the support shaft that press against the inner diameter of the roll body with some interference. A convex metal is provided, and a conical protrusion is provided on the axis side of the convex metal. The difference angle θ between the tangent on the outer diameter and the tangent on the outer diameter of the protrusion connecting the tip B of the protrusion and the corner P point is greater than or equal to the friction angle between the inner diameter of the roll and the protrusion. The protruding metal is formed symmetrically so that it does not move in the longitudinal direction of the shaft, but is held in position, and is provided on the support shaft so that it can freely rotate the required amount in the radial direction, and the neutral elasticity of the protruding metal is An elastic body such as rubber is provided on the upper side of the protrusion for holding the body, and a retaining ring is attached to the upper side of the elastic body on the support shaft side, and the protruding metal is held in position by the elastic body with the retaining ring. He suggested things such as "something that would stop the car from popping out."

In view of the above-mentioned points, the present invention proposes a roll support shaft structure that further improves these and is also applicable to general small-sized roll support shafts.

[Means for solving problems]

In other words, the means to achieve this purpose is to move support shafts from both ends of the structure that holds the roll body for winding paper, film, etc. so that it can be attached and detached. Protrusions having spring action, for example, protrusions at a plurality of locations, are formed by punching and bending on the inner diameter side of the cylindrical collar provided inside, and integrally formed with the collar. Further, the protrusion is provided with a support shaft that engages with the projection so as to act as a stopper, and the outer peripheral surface of the support shaft is formed in the axial direction in the shape of fine triangular teeth such as knurling, and serves as the stopper.
Further, a shaft diameter portion slightly smaller than the inner diameter of the collar is provided at the base portion into which the collar is inserted, and these are integrally constructed.

Regarding the formation of the protrusion, it is possible to cut a U-shaped cut directly into the tsuba metal and punch it out at a predetermined angle to form an integral part, or to form a separate ring with the protrusion on the inner wall of the tsuba metal. It is possible that the material is welded and fixed to the surface.

Next, its effect will be explained.

[Effect]

In the roll support shaft configured as described above, the support shaft is inserted into the roll body when the roll body is held between the support shafts. At this time, if a protrusion, such as a louver, is formed, it may not fit properly into the groove of the knurl and seem to prevent insertion of the support shaft, but the tip of the support shaft has a gently tapered shape, and the louver The tip is formed to fit into the groove of the knurl, so
For example, even if it comes into contact with the triangular toothed part of the knurling, if you slightly turn the roll body or support shaft side,
There is no problem as it will fit into the groove mentioned above. Furthermore, since the louver is made of a material that has a spring action function, the louver is set in a state in which the support shaft is slightly pressed due to the tapering action of the support shaft.

Therefore, once the tip of the louver is inserted into the groove, the two become completely integrated, and no slipping occurs between them.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

〔Example〕

Fig. 1 is a front sectional view of the main parts showing one embodiment of the roll support shaft structure of the present invention, Fig. 2 is an enlarged view of the support shaft, and Fig. 3 is a view taken along the line A-A' in Fig. 1. This is a detailed sectional view of the directional collar, and since the movable mechanism of the support shaft shown in FIG. 5 has been described above, it will not be described here.

1 to 3, the structure of the roll support shaft is formed by making a U-shaped cut in the collar 1a, which is one of the components of the roll body 1 , and bending it inward at a predetermined angle. There is. The angle of this bent protrusion A is arbitrarily selected depending on the pitch of the parallel knurling.

In addition, in order to provide the protrusion A with a spring action that prevents the collar 1a from biting during removal, mild steel is used in this case since the gap between the support shaft 2 and the collar 1a is small. The protrusions A are arranged all around the inner wall or as a group of protrusions A at three equally spaced locations.

Furthermore, as a stopper for this protrusion A, as shown in FIG. A shaft diameter portion 2c, which is slightly smaller than the inner diameter of the collar 1a, is formed at the base of the collar 2b and the collar 1a.

In this embodiment, the louvers are formed on the collar 1a itself, but there are cases where a louver is attached to the inner wall of the collar 1a by welding or the like.

The operation of the roll support shaft integrally constructed in this way will be explained with reference to FIGS. 4 and 5.

First, when inserting the roll body 1 , preparations are made for setting it concentrically with the support shaft 2 using a lifter (not shown). When the right support shaft 2 is moved axially to the left in this state, the support shaft 2 is inserted into the inner diameter of the collar 1a of the roll body 1.

During this insertion, as shown in Fig. 4, which shows the state of engagement between the protrusion and the knurling, the protrusion A' surrounded by dotted lines hits the triangular toothed part of the knurling and the support shaft 2
If insertion is obstructed, the roll body 1 or the support shaft 2 is slightly rotated to move the protrusion A' away from the triangular tooth portion and into the valley q. In addition, the support shaft 2
Immediately before insertion, it seems that the support shaft 2 does not enter the inside of the collar 1a, but since the support shaft 2 has a gentle taper 2b, it is inserted smoothly, and the support shaft 2 is inserted into the collar using the shaft diameter portion 2c as a guide. It comes into contact with gold 1a.

In this way, the support shaft 2 and the collar 1a are firmly engaged, and the torque of the roll body 1 is transmitted to the support shaft 2.

Next, at the time of removal and removal, the lifter is placed at the bottom of the roll body 1 by the reverse operation during insertion and insertion, and the right support shaft 2 is moved to the right to move the roll body 1 with the lifter. receive.

[Effect of idea]

As explained above, according to the present invention, the support shaft 2
Since it is deeply inserted into the collar 1a, concentricity of the shaft center is obtained, thereby eliminating core run-out, and the spring action of the protrusion A is such that the collar 1a does not bite when removed. Therefore, the problem of the collar 1'a getting stuck to the cone shafts 10, 10' as in the past is eliminated, and the most improved element is that there are almost no parts that make up the roll support shaft. It is only necessary to form a protrusion on the collar attached to the paper tube of the roll body 1 and carve a parallel knurl on the support shaft, resulting in a significant cost reduction. Production is also possible. In this example, the structure of a large roll support shaft built into a brake cylinder was explained, but the structure is not limited to this, and can be applied to various types of winding machines such as printers and printing presses that hold paper tubes between support shafts. Also applies to roles.

Therefore, the roll support shaft structure of the present invention is extremely useful in practice in the field of handling roll bodies for winding up paper, film, and the like.

[Brief explanation of drawings]

Fig. 1 is a front sectional view of the main parts showing one embodiment of the roll support shaft structure of the present invention, Fig. 2 is an enlarged view of the support shaft, and Fig. 3 is a view taken along the line A-A' in Fig. 1. A detailed cross-sectional view of the direction collar, FIG. 4 is an explanatory diagram showing the state of engagement between the protrusion of the collar and the knurling, and FIG. 5 is a front cross-sectional view of the main part showing an example of the structure of the conventional one when the support shaft is attached. It is. 1 , 1' ...Roll body, 1a, 1'a...Tsubame, 1b, 1'b...Core tube, 1c, 1'c...Sheet, 2...Support shaft, 2a...To Tsubame insertion part,
2b... Taper, 2c... Shaft diameter portion, A, A'...
protrusion.

Claims (1)

[Scope of utility model registration request] In a structure in which a roll body for winding paper, film, etc. is sandwiched so that it can be attached and detached by moving a support shaft from both ends, a spring action is formed by punching and bending the spring action on the inner diameter side of a cylindrical collar provided inside the roll body. A protrusion having a shape is integrally formed on the collar, and a protrusion having a fine triangular tooth shape such as a knurl is formed on the outer peripheral surface of the support shaft so as to engage with the protrusion.
Further, a roll support shaft structure characterized in that a shaft diameter portion slightly smaller than the inner diameter of the collar is provided at the base portion where the collar is inserted, and the triangular tooth-shaped protrusion is integrally configured to lock rotation of the roll body. .