JPH0727116Y2 - Metal core device for tubular rubber cutting machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting machine for cutting tubular rubber into a predetermined width, and more particularly to a core metal device for fitting and holding tubular rubber.

[0002]

2. Description of the Related Art Conventionally, a cylindrical core metal is press-fitted with a cylindrical elastic core made of a soft elastic material, and a tubular rubber for cutting is fitted and held by the elastic core. was there.

[0003]

In the above-mentioned prior art, a tubular rubber for cutting is fitted on the outer periphery of an elastic core body, and then the elastic core body is press-fitted into a core metal, which is elastically deformed to a large diameter. Then, the tubular rubber is held. In this case, when the elastic core body is press-fitted into the cored bar, a lubricant such as oil is applied to the surface of the cored bar to press-fit the elastic cored body, or one end of the elastic cored body is attached to one end of the cored bar. The other end of the elastic core is closed by fitting, compressed air is supplied from the other end, and the elastic core is expanded by the compressed air and fitted to the core metal. For this reason, there is a drawback that labor and skill are required when press-fitting the elastic core body into the core metal. An object of the present invention is to obtain a novel cored bar device for a tubular rubber cutting machine that solves the above drawbacks.

[0004]

The present invention is configured as follows to achieve the above object. That is, the outer peripheral surface of the rod-shaped cored bar is surrounded by a movable cored bar having an arcuate cross section divided in the circumferential direction, and the movable cored bar is surrounded by an elastic core formed in a cylindrical shape by a soft elastic material, Between the outer peripheral portion of the cored bar and the inner peripheral portion of the movable cored bar, each movable cored bar is moved radially outward when the movable cored bar is moved in one end direction with respect to the cored bar. A cam mechanism is provided, a cap-shaped pressing body that abuts against the other end surface of each movable core bar is slidably fitted to the other end of the core bar, and a center is provided at the axial center part of the other end of the press bar. It is configured.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a partial cross-sectional view showing an embodiment of the present invention, FIG. 2 is a II-II cross-sectional view thereof, and FIG. 3 is a cross-sectional view corresponding to II-II in a state in which a movable core metal is operated to a small diameter. In FIG. 1, reference numeral 1 denotes a mounting shaft that is taper-fitted to a main shaft (not shown) of the cutting machine, and integrally has a large-diameter flange 2 at the right end portion. At the right end of the mounting shaft 1, a cored bar 3 is extended rightward and fixed coaxially. The cored bar 3 is made of a metal material and has a cylindrical shape. A large diameter cap-shaped holder 4 is fastened and fixed to the left end by a bolt 5, and the holder 4 is fastened and fixed to the flange 2 by a bolt 6.

The outer peripheral portion of the cored bar 3 is surrounded by a movable cored bar 7 divided into three in the circumferential direction. The movable cored bar 7 is made of a metal material and has a radius larger than that of the cored bar 3 and is formed in an arc-shaped cross section, and its arc angle is inscribed in the cored bar 3 as shown in FIG. At this time, it is set so that the end faces of the movable cored bars 7 on the arc side are close to each other. Further, circumferential grooves 8 are formed in the outer peripheral portions of the left and right ends of each movable cored bar 7, and a ring-shaped spring 9 is fitted in the groove 8 so that each movable cored bar 7 is axially centered by the spring 9. Tighten and urge in the direction of (core 3). Further, a spring bearing 10 that projects radially outward is formed at the left end of each movable cored bar 7, and the spring bearing 10 is fitted in the cylindrical portion of the holder 4, and the bottom portion of the holder 4 and each spring bearing 10 are fitted. A compression spring 11 is interposed between the movable cored bar 7 and the left end surface of the movable cored bar 7 and the movable cored bar 7 is urged rightward against the cored bar 3 by the compressed spring 11. Reference numeral 4a denotes a disk-shaped stopper fixed to the right end surface of the holder 4 by bolting, for preventing excessive movement of each movable cored bar 7 to the right.

A cam mechanism 12 is provided between the outer peripheral portion of the core metal 3 and the inner peripheral portion of each movable core metal 7. This cam mechanism 1
Reference numeral 2 denotes recesses 13 formed on the outer peripheral portion of the cored bar 3 facing the movable cored bar 3 at three positions in the left-right direction. It is attached so that it can rotate freely around. The tops of the rollers 14 on the outer peripheral side are projected outward in the radial direction from the outer peripheral surface of the cored bar 3. Further, a cam surface 15 with which the rollers 14 come into contact is formed in a concave shape on the inner peripheral surface of each movable cored bar 7. As shown in FIG. 1, the cam surface 15 is formed in an arc shape in the left-right direction, and when the movable cored bar 7 is moved to the right by the compression spring 10, the deepest portion 15a of the cam surface 15 is in the initial position. Is formed so as to be located on the top of the outer peripheral portion of the roller 14.

A cap-shaped pressing body 16 is slidably fitted to the right end of the core metal 3. The pressing body 16 has its left end face brought into contact with the right end face of each movable cored bar 7,
A taper hole, that is, a center 17, which is fitted and locked to the core pushing shaft 22 is formed in the shaft center portion of the right end surface of the. The pressing body 16
Has a long and narrow elongated hole 18 formed in the left and right direction on its outer peripheral portion, and the pin 1 fixedly implanted in the right end portion of the cored bar 3 in the elongated hole 18
9 is slidably fitted so that it cannot rotate relative to the mandrel 3. When the pressing body 16 is moved leftward by the core pushing shaft, each movable cored bar 7 is moved leftward to bring the right end (top) of the cam surface 15 into contact with the roller 14, as shown in FIG. As described above, each movable cored bar 7 is expanded to have a large diameter and a perfect circle.

A cylindrical elastic core body 20 made of a soft elastic material such as urethane resin is fitted around the movable cored bar 7. The initial inner diameter of the elastic core body 20 is such that each movable core metal 7 is moved in the axial direction as shown in FIG.
When the movable cored bar 7 is moved outward in the radial direction so as to be larger than the outer diameter when it is contracted so as to contact the cored bar 3 and is expanded so as to be separated from the cored bar 3 as shown in FIG. The diameter is smaller than the outer diameter. The initial outer diameter of the elastic core body 20 is formed to be slightly smaller than the inner diameter of the tubular rubber 21 for cutting.

The mode of use of the above embodiment will be described.
When the core pushing shaft 22 is moved rightward and separated from the pressing body 16, each movable cored bar 7 is moved rightward with respect to the cored bar 3 by the reaction force of the compression spring 11, and the deepest portion of the cam surface 15 is reached. Comes into contact with the roller 14 and each of the movable cored bars 7 has a small diameter as shown in FIG. In this state, the tubular rubber 21 for cutting is fitted to the outer periphery of the elastic core body 20, and then the elastic core body 20 is fitted to the movable core metal 7. Next, when the core pushing shaft 22 is moved to the left and press-fitted to the center 17 of the pressing body 16 with a predetermined pressure, the movable cored bar 7 is moved to the left via the pressing body 16, As shown in, the right end (top) of the cam surface 15
Contact the roller 14 and each movable cored bar 7 expands into a large diameter and a perfect circle as shown in FIG. 2 and press-contacts with the inner circumference of the elastic cored body 20, so that the elastic cored body 20 has a large diameter. The tubular rubber 21 that has been expanded to fit in the outer periphery thereof is elastically held.

When a main shaft (not shown) is rotated in this state, the cored bar 3 is rotated via the mounting shaft 11 and the holder 4, and along with this, the movable cored bar 7, the elastic cored body 20 and the tubular rubber 21. Is rotated. Next, a cutter (not shown) is moved in the direction of the elastic core body 20 from the direction orthogonal to the rotation axis,
The tubular rubber 21 is cut into a predetermined width.

[0012]

As is apparent from the above description, according to the present invention, the movable cored bar divided in the circumferential direction is provided on the outer periphery of the cored bar.
A cam mechanism for changing the movable core in the radial direction when moved in the axial direction and a pressing body with a center for moving the movable core in the axial direction are provided, and the elastic core is fitted to the movable core. With this configuration, the elastic core body can be quickly and easily attached to and detached from the core metal.

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a cross-sectional view corresponding to II-II in a state in which the movable core bar is operated to have a small diameter.

[Explanation of symbols]

 1 Mounting Shaft 2 Flange 3 Core Bar 4 Holder 4a Stopper 5 Bolt 6 Bolt 7 Movable Core Bar 8 Groove 9 Spring 10 Spring Receiver 11 Compression Spring 12 Cam Mechanism 13 Recessed Notch 14 Roller 15 Cam Surface 15a Deepest Part 16 Pressing Body 17 Center 18 Long hole 19 Pin 20 Elastic core 21 Tubular rubber 22 Centering shaft

Claims (1)

[Scope of utility model registration request] 1. An outer peripheral surface of a rod-shaped cored bar is surrounded by a movable cored bar having an arc-shaped cross section divided in a circumferential direction, and the movable cored bar is surrounded by an elastic core body formed of a soft elastic material in a cylindrical shape. Between the outer peripheral portion of the cored bar and the inner peripheral portion of the movable cored bar, the movable cored bar is moved radially outward when the movable cored bar is moved in one end direction with respect to the cored bar. And a cap-shaped pressing body that abuts against the other end surface of each movable cored bar is slidably fitted to the other end of the cored bar, and is attached to the shaft center part of the other end of the pressing body. A core metal device for a tubular rubber cutting machine, which is provided with a center.