JPH053486Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention moves support shafts from both ends to sandwich paper, film, etc. so that it can be attached and detached by a roll body that winds it up, and also applies a brake torque for tension to the roll sheet. Regarding the roll support shaft that is applied, it ensures concentricity between the roll body and the support shaft, making it possible to transmit a large brake torque with a small shaft thrust force. This invention relates to a structure of a roll support shaft in which a sloped groove for a roller provided on the shaft is formed.

[Conventional technology]

A generally known structure of a roll support shaft is shown in FIG.

That is, FIG. 4 is a front sectional view of a main part showing an example of the structure of a conventional roll support shaft in an attached state.
The roll body 1 has a core tube 1 having collars 1-b at both ends.
A sheet 1-a of paper, film, etc. is rolled up on a roller 1-c, and the conical portions of cone shafts 9, 9' serving as support shafts are inserted from both ends into the inner diameter of the collar 1-b to form a roll. 1 is supported. The cone shafts 9, 9' are supported by bearings 10, 10' to ensure the axis of rotational movement, and require brake torque to apply tension to the seat 1-a. For this braking force, a brake 12 with a disk 11a is attached to the cone shaft 9 on the opposite side to the roll body side, and the other cone shaft 9' is moved in the axial direction to attach and detach from the roll body 1 and brake. A piston 13 is attached for transmitting torque. Further, the entire case of the bearing 10' supporting the cone shaft 9' is supported by a sleeve bearing 14, so that the cone shaft 9' can freely move in the axial direction, and a cylinder 15 is used as a driving source for this movement. These are integrally constructed using bolts or the like.

Next, the operation process of the roll support shaft structure constructed as described above will be explained.

First, at the time of insertion and removal, a receiving lifter (hereinafter simply referred to as a lifter) is raised from the lower part of the roll body 1 and prepared to lightly contact the lower part of the roll body 1 to receive the weight. (not shown) and
The left port of the cylinder 15 is evacuated and the cone shaft 9' is moved to the right. This moving distance is set to be longer than the length that each cone shaft 9, 9' is inserted into the roll body 1.

When the right cone shaft 9' is removed, the roll body 1
The right half of the weight of is received by the lifter. In this state, when the roll body 1 is manually pushed axially to the right, the lifter has a rolling bearing that can move in the axial direction, so the roll body 1 easily moves to the right and is removed from the cone shaft 9. .

At the time of insertion, the roll body 1 mounted on the lifter is stopped in advance approximately aligned with the axes of the cone shafts 9, 9', and air enters and exits the air port of the cylinder 15 in the opposite direction to that during removal. By exhausting the air, the cone shaft 9' moves to the left. At this time, ensuring concentricity between the axis of the cone shaft 9' and the roll body 1 is as follows:
The conical portion at the tip of the cone shaft 9' hits the inner diameter portion of the collar 1-b of the roll body 1, and the eccentric shaft center moves due to the taper effect.

When the cone shaft 9' is further moved to the left, the conical portion of the other cone shaft 9 is inserted into the collar 1-b, and the eccentric shaft center is corrected in the same way as the right cone shaft 9'. When the piston 13 is further moved to the left, this axial thrust acts on the collar 1-b from the conical part of the cone shafts 9, 9', and the component force of the tapered part acts as a frictional force on the contact surface, causing the left end to The torque of the tension brake 12 provided in the vehicle is now transmitted.

Note that the brake 12 is provided for tension control of the roll body 1 and is not directly related to the present invention, so a description thereof will be omitted.

[The problem that the idea attempts to solve]

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

(1) Since the collar 1-b is made by pressing metal, the accuracy and roundness of the inner diameter are not very good. The method of fixing this collar metal 1-b to the core tube 1-c is to make cuts in multiple places marked with an "X" on the collar metal 1-b, insert it into the inside of the core tube 1-c, and then Press from the top with a jig or the like to make the part marked with an "X" bite into the core tube 1-c. The material of the core tube 1-c is generally cardboard, etc., and the material of the core tube 1-c is not too strong.
- Not fixed to b.

In such a state, the cone shafts 9, 9'
In order to insert the cone shaft smoothly and to transmit torque with less force, the taper of the conical part of the cone shafts 9, 9' should be made very gentle. -b is digging into the cone shaft 9,
When the collar 9' is removed, the collar 1-b is attracted to the conical part side and comes off from the core tube 1-c.
b from the cone shafts 9, 9' becomes extremely problematic. Therefore, the current practice is to use a conical part with a steep taper.

In addition, when a steep taper is inserted into the collar 1-b, the axis of the roll body 1 is not completely concentric just before insertion, so the force that moves the weight of the roll body 1 concentrically is Cleanser, roll 1
For example, if the diameter and length are 1m, the weight is approximately 800Kg, so it will be an extremely large force.
Moreover, since the axis is eccentric, this force acts on one point. However, the material of the core tube 1-c that supports the collar 1-b is made of cardboard or the like and is distorted, so that the core tube 1-c is bent in the direction in which the force is applied and is inserted. As a result, the concentricity of the shaft core is impaired and the shaft rotates with eccentricity, causing vibrations, and when the roll body 1 is removed, the cone shaft 9,
The collar 1-b bites into 9', making it extremely difficult to remove.

(2) Since the slope of the conical part is steep, the component force acting on the inner diameter of the collar 1-b due to the axial thrust becomes small, so a large thrust is required to obtain the required transmission torque, which is coupled with an increase in power. Roll body 1
When the bearing 10 rotates, this axial thrust forces the bearing 10,
10', causing problems in terms of lubrication, lifespan, etc.

The present invention has been made with attention to the points mentioned above, and its purpose is to provide a cone shaft 9,
The purpose of the present invention is to provide a roll support shaft structure that ensures concentricity between the axes of the roll body 9' and the roll body 1, and that can reliably obtain rotational torque with a small axial thrust.

[Means to solve the problem]

In other words, the means to achieve this purpose are: a shaft 2a and a cylindrical shaft 2b into which this shaft 2a is inserted.
and a tip shaft 2c provided at the tip of this cylindrical shaft 2b form a support shaft 2, and this support shaft 2 is attached to the roll body 1.
The shaft 2a has three or more grooves u on the same surface with approximately the same diameter.
A roll 3 which can rotate in the longitudinal direction of the shaft and slightly protrudes from the outer peripheral surface of the shaft 2a is supported in the groove U, and a roll 3 is provided on the outer periphery of the cylindrical shaft 2b after being inserted into the roll body 1. A collar A is provided on the end side, and the inner periphery of the collar A has a required slope d to engage with the groove U and encompasses the width of the roller so that the diameter of the cylindrical shaft 2b is expanded by the roller 3. A downward slope groove v is provided, and a slit y is provided in the radial direction to make the thickness of the cylindrical shaft 2b thinner so that the inner expansion of this cylindrical shaft 2b can be easily performed on the tip side, and each downward slope A vertical slot x is provided from the rear end side of the cylindrical shaft 2b in the axial direction of the intermediate portion in the approximate radial direction of the groove v, and a recess q is provided in the axis of the cylinder in the tip shaft 2c.
A spring 6 is provided in this recess q.

In addition, the slope groove v is provided so that the roller 3 can rotate.
is divided by slope part a and this slope part a by y
In some cases, an axially parallel portion b up to the length b may be provided.

In addition, regarding the grooves u at three or more places, depending on the angle of the slope d, the depth of the groove v, that is, the direction of the shaft tip may extend.

An embodiment of the present invention will be described in detail below with reference to the drawings.

〔Example〕

FIG. 1 is a front sectional view of a main part showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. In addition, in FIGS. 1 and 2, the support shaft 2 is being inserted into the structure of the roll support shaft, and the cylindrical shaft 2 is just being inserted.
b shows a state on the verge of being pushed out by the rollers 3 on the slope due to axial movement and causing inward expansion.

In FIGS. 1 and 2, the structure of the roll support shaft is such that the support shaft 2 is moved from both ends to sandwich the roll body 1 for winding up paper, film, etc. so that it can be attached and detached, and the brake torque for tension is applied. In the structure to be applied, the support shaft 2 is provided with a groove U that allows the rollers 3 to rotate in the axial direction at four locations, is fixed to the shaft diameter part with a pin 4 so as to slightly protrude from the outer peripheral surface, and a collar A is attached to the rear part of the support shaft 2. A sloped portion d is attached to one side of the shaft 2a provided with the cylindrical shaft, and a downwardly sloped groove v that widens toward the left end where the roller 3 can rotate is cut into this sloped portion d, and each downwardly sloped groove At four locations in the axial direction of the intermediate portion in the approximately radial direction of v, longitudinal slots x are provided from the rear end side of the cylindrical shaft 2b, and a flange A that comes into contact with the flange A' of the shaft 2a is provided at this sloped portion. is a cylindrical cylinder constructed by providing a slot y in the radial direction at the front end of the end so that the slot x can easily expand inwardly, and with a play allowance so that the shaft 2a can be smoothly attached and detached from the sloped part. A recess q is provided in the shaft 2b and the axis of the cylinder, and a spring 6 is built in the recess q, so that the shaft 2a is connected to the cylindrical shaft 2b.
The cylindrical shaft 2c is fixed to the cylindrical shaft 2b with a bolt 5 or the like so that the shaft 2a is compressed when inserted into the cylindrical shaft 2b.

The stopper 7 acts as a stopper when the spring 6 is extended, and is mounted at a position where a plate 8 that presses the spring 6 comes into contact. The tip shaft 2c has a parallel diameter with some play in the inner diameter of the collar 1-b, and the tip is chamfered for guidance.

Next, the operation of the roll support shaft configured as described above will be explained.

First, when inserting the roll body 1, preparations are made for setting it concentrically with the support shaft 2 using a lifter (not shown). In this state, move the support shaft 2 on the right side (not shown here, but since it has the same configuration and function as in Fig. 1, the reference numeral will be used hereafter) arranged in contrast to the one in Fig. 1 in the axial direction. If you move it to the left,
The tip shaft 2c is inserted into the inner diameter of the collar 1-b of the roll body 1. The outer diameter of the tip shaft 2c is smaller than that of the collar 1-b and has a parallel diameter, so it moves smoothly and the collar 1-b is in contact with the back side of the collar A of the cylindrical shaft 2b. come into contact with

When the support shaft 2 is further moved to the left, the support shaft 2
The roller 3 fixed to the cylindrical shaft 2b spreads out the slot x of the shaft 2a in the outer diameter direction while moving in the downward slope groove v of the sloped part of the cylindrical shaft 2b, so that the outer diameter part of the shaft 2a spreads out in the direction of the outer diameter of the collar 1-b. Eliminate loose parts and make contact. In addition, since the slope portion d of the downward slope groove v of the cylindrical shaft 2b that contacts the roller 3 is formed extremely gently, a large internal expansion force acts with a small shaft thrust force, and the cylindrical shaft 2b and the collar 1 Sufficient pressure is applied to the contact surfaces of the inner and outer diameters with -b, and reliable transmission torque can be obtained. Of course, when the right support shaft 2 moves to the left, frictional force is generated due to the weight of the roll body 1.
Before the collar 1-b of the roll body 1 comes into contact with the back side of the collar A of the cylindrical shaft 2b, the self-weight of the roller body 1 must be The tip axis 2c generated by
The spring 6 is designed to act against the insertion direction of the shaft 2a with a force greater than the friction between the inner and outer diameters of the cylindrical shaft 2b and the collar 1-b.

That is, the collar 1-b is the collar A of the cylindrical shaft 2b.
There is no relative movement between the roller 3 provided on the shaft 2a and the groove slope of the cylindrical shaft 2b until the roller 3 comes into contact with the flange surface of the cylindrical shaft 2b. By moving with a force stronger than the spring force 6, the cylindrical shaft 2b expands by the slots x and y. In addition, even if the groove slope of the roll 3 is made extremely gentle, the contact surface with the roller 3 is not moved by relative sliding friction as in the past, but by rolling friction, so there is no biting during return, and the inward expansion is prevented. Furthermore, the friction loss is small, and the inward expansion force is large due to the small slope, so the force acts extremely effectively.

Further, other embodiments of the present invention will be described. That is, Fig. 3 is a front sectional view of the main part, and the difference from Fig. 1 is that the groove in the slope part d in Fig. 1 is divided into the groove in the slope part a and the groove in the parallel part b. .

In other words, the support shaft 2' is composed of a shaft 2'a, a cylindrical shaft 2'b, and a tip shaft 2'c. b
A groove is provided in the surface of the collar A of the cylindrical shaft 2b and the shaft 2a.
The roller 3 is designed to be located in the groove of the parallel portion b when the surface of the flange A' is in contact with the surface.

Next, as shown in FIG. 3, the operation until the roll body 1 is completely inserted into the cylindrical shaft 2'b and its outer diameter is expanded will be explained with reference to FIG. , the tip shaft 2'c is inserted into the inner diameter of the collar 1-b of the roll body 1. The cylindrical shaft 2'b is not expanded inward until the roller 3 reaches the groove of the parallel portion b.

Furthermore, the support shaft 2' is moved to the left, and the roller 3
When the cylindrical shaft 2'b reaches the parallel part b, the cylindrical shaft 2'b suddenly expands, and the enlarged outer diameter of the cylindrical shaft 2'b remains constant until the ribs A and A' come into contact, and the expansion of the outer diameter of the cylindrical shaft 2'b remains constant until the ribs A and A' come into contact with each other. Even if the thrust force is released, Tsubakin 1-
The internal pressure of the outer diameter of the cylindrical shaft 2'b against the inner diameter of b is maintained. If the cylinder force is kept small in this state, the bearing 10 shown in FIG.
The force applied to 10' is reduced, which is extremely advantageous in terms of life, lubrication, etc.

[Effect of idea]

As explained above, according to the present invention, the structure of the roll support shaft allows the support shaft to be moved from both ends of the roll body 1 of paper, film, etc. to attach and detach the roll body 1, and to apply brake torque for tension. A plurality of rollers 3 are fixed to the support shaft so as to be rotatable in the axial direction at three or more locations, and a sloping groove is formed in the cylindrical shaft so as to correspond to the position of the rollers 3 and to cover the width of the rollers, This is fitted onto the shaft, the cylindrical shaft and the tip shaft are integrally fastened, and the spring 6 is built into the tip shaft so that the cylindrical shaft and the tip shaft can move in the direction of the tapering of the slope. Compared to applying the sliding friction of the tapered portions of the cone shafts 9 and 9' directly to the roll body 1, the friction force is indirectly applied by expanding the cylindrical shaft inwardly, and the acting force of the internal expansion is applied via the roller 3. This method uses the gradient.

This makes it possible to make the slope extremely gentle, and in some cases, it is possible to have a parallel portion b, which allows the required transmission torque to be obtained even with a small shaft thrust force, and improves the concentricity of the shaft. At the same time, it solves problems such as economical efficiency and lubrication, and has many advantages.

Therefore, the roll support shaft structure of the present invention is extremely useful in practice.

[Brief explanation of drawings]

Fig. 1 is a front sectional view of the main part showing one embodiment of the present invention, Fig. 2 is a sectional view taken along the line A--A of Fig. 1, and Fig. 3 is a front sectional view of the main part showing another embodiment of the invention. Figure, 4th
The figure is a front sectional view of a main part showing an example of the conventional technology. 1...Roll body, 2 , 2' ...Support shaft, 2a,
2'a...shaft, 2b, 2'b...cylindrical shaft, 2c,
2'c...Tip shaft, 3...Roller, 6...Spring,
x, y...slot, a, d...gradient part, b...
...Parallel part, u...groove, v...downward slope groove.

Claims (1)

[Scope of claims for utility model registration] (1) Shaft 2a and cylindrical shaft 2b into which this shaft 2a is inserted
and a tip shaft 2c provided at the tip of this cylindrical shaft 2b.
The support shaft 2 is inserted into the openings at both ends of the roll body 1, and the shaft 2a has three or more grooves on the outer circumference of the same diameter from the shaft end. A roll 3 that can rotate in the longitudinal direction of the shaft and slightly protrudes from the outer peripheral surface of the shaft 2a is supported in the groove u, and a roll 3 that is inserted into the roll body 1 is provided on the outer periphery of the cylindrical shaft 2b. A collar A is provided on the rear end side, and the inner periphery of this collar A side has a required slope d that engages with the groove U and includes the roller width so that the diameter of the cylindrical shaft 2b is expanded by the roller 3. A downwardly sloping groove v is provided on the tip side, and a slot y is provided in the radial direction to make the thickness of the cylindrical shaft 2b thinner so that the inner expansion of the cylindrical shaft 2b can be easily performed. A vertical slot x is provided from the rear end side of the cylindrical shaft 2b in the axial direction of the intermediate portion in the approximately radial direction of the gradient groove v, and a recess q is provided in the axis of the cylinder on the tip shaft 2c, and this recess A roll support shaft structure characterized in that a spring 6 is provided at q. (2) The sloped groove v is formed so that the roller 3 can rotate.
The roll support shaft structure according to claim 1, which is a registered utility model, characterized in that it has a sloped portion a and an axially parallel portion b from the sloped portion a to the slot y.