JP2003341885A - Roll shaft for plastic sheet or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the work and improve the work efficiency and to provide a roll shaft for a plastic sheet or the like causing no rust by reducing the weight of the shaft of the roll shaft used in taking up or feeding the plastic sheet or the like and reducing the weight of a pair of right and left clamp devices for fixing the core tube of the plastic sheet to the shaft. <P>SOLUTION: This roll shaft 1 is provided with a pair of right and left clamping devices 3 for inserting the core tube 7 round which the plastic sheet 8 is wound, holding the end of the core tube 7 with a holder 9 having a truncated conical shape, and fixing the core tube 7 to the shaft. The roll shaft 1 is composed of a shaft body 2 and a bearing part 5, the shaft body 2 and the bearing part 5 are both formed by a steel-made hollow pipe, and the bearing part has a wall thickness to have the strength for supporting the plastic sheet 8 mounted on the shaft body 2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum forming of a belt-shaped plastic sheet or a plastic film, which is supplied from an extrusion molding machine used as a material of a plastic vacuum-formed product, between shaft support portions of a winding device or after winding. A roll shaft for a plastic sheet or a plastic sheet that supports the plastic film in order to wind or feed the plastic sheet or plastic film, which is installed between the shaft support parts of the feeder for the molding machine. is there.

[0002]

2. Description of the Related Art Conventionally, a roll shaft made of a plastic sheet or the like is made of steel and is formed into a single rod. Further, a pair of left and right clamp devices for gripping a core tube made of a plastic sheet or the like inserted in the shaft from both end portions with frustoconical gripping bodies and fixing the pair of left and right clamp devices is also made of steel.

[0003]

A conventional roll shaft such as a plastic sheet is formed into a rod-shaped body made of steel from the viewpoint of steel property, and its weight is about 24 kg.
However, it was heavy to carry the roll shaft and to erection the equipment, especially for the elderly and women.

The core tube around which a plastic sheet or the like is wound has a heavy weight because the clamping device for fixing it to the shaft is also made of steel and the frustoconical gripping body is made of steel. It became a considerable weight, which was also a factor that hindered work efficiency.

Further, if the shaft of the roll shaft and the frustoconical gripping body are made of steel, rust easily occurs, and if rust adheres to the plastic sheet or the like, it is unsanitary when the molded product is a food container or the like. However, the product value will be impaired.

In view of the above points, the present invention provides a pair of left and right clamps for reducing the weight of a roll shaft used when winding or supplying a plastic sheet and for fixing a core tube of the plastic sheet or the like to the shaft. The present invention intends to reduce the weight of the apparatus, to reduce the work and improve the work efficiency, and to provide a roll shaft such as a plastic sheet that does not cause rust.

[0007]

In order to solve the above problems, a roll shaft of the plastic sheet or the like according to the present invention according to claim 1 has a core tube around which the plastic sheet is wound, and the end of the core tube has a truncated cone shape. A roll shaft having a pair of left and right clamp devices for gripping a core tube and fixing the core tube to a shaft by a gripping body. The roll shaft is composed of a shaft body and a bearing portion, and both the shaft body and the bearing portion are made of steel. It is characterized in that it is formed of a hollow tube, and that the bearing portion is thick enough to support the shaft body with a plastic sheet or the like mounted thereon.

In the present invention having such a structure, since the shaft main body and the bearing portion are formed of the hollow tube made of steel, the weight is lighter than that of the round bar body made of steel. or,
The bearings provided at both ends of the shaft body are thick enough to support the plastic body etc. mounted on the shaft body. The roll shaft is installed between the supporting portions of the above, and the plastic sheet or the like can be sufficiently supported even if a load is applied to the bearing portion. Then, each hollow tube can be selected according to the required strength in each of the shaft main body portion and the bearing portion, and the overall weight can be reduced.

According to a second aspect of the present invention, a steel hollow tube of the shaft main body and the bearing portion is subjected to rust-prevention treatment, and the rust-prevention treatment does not cause rust on the surface, so that it can be applied to a plastic sheet or the like. There is no risk of rusting, and the molded product is clean and sanitary.

Next, in the roll shaft of the plastic sheet or the like according to the third aspect of the present invention, the grip body is made of plastic. When the grip body is made of plastic, it is lighter than steel and does not rust at all. Therefore, there is no risk of rust adhering to the plastic sheet or the like, and the molded product is also clean and hygienic.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a usage state of a roll shaft such as the plastic sheet of the present invention, FIG. 2 is a partially enlarged sectional view of the same, FIG. 3 is an enlarged side view of the same, and FIG. 4 is a side view of a gripping body.

1 is a roll shaft,
The roll shaft 1 is composed of a shaft main body 2, a bearing portion 5 provided at both ends of the shaft main body 2, and a pair of left and right clamp devices 3 attached to the shaft main body 2.

The shaft main body 2 is made of steel and is formed of a hollow tube, and graduations 4 are engraved in the circumferential direction at predetermined intervals on the outer circumference. Then, the base side of the bearing portion 5 formed of a hollow steel tube having a thickness larger than that of the shaft body 2 at both ends of the shaft body 2 is fitted to the end portions of the shaft body 2, and is formed on the outer periphery of the base side. The flange portion 6 and the mouth end of the shaft body 2 are integrally joined by welding. The thickness of the bearing portion 5 is
The thickness of the shaft main body 2 has a strength sufficient to withstand the roll shaft installed between the shaft supporting portions of the molding machine with the plastic sheet attached.

In FIG. 3, the surfaces of the shaft body 2 and the bearing portion 5 are rustproofed, and a rustproof layer 23 is provided to prevent rusting. The rust preventive treatment may be carried out by the usual method and means for steel.

A core tube 7 is inserted through the shaft body 2, and a plastic sheet 8 is wound around the outer circumference of the core tube 7. The core tube 7 is clamped by the pair of left and right clamp devices 3, both ends of which are fixed to the shaft body 2.

The clamping device 3 comprises a frustoconical gripping body 9,
It is composed of a tightening body 10 connected to the grip body 9. The frustoconical gripping body 9 is made of plastic, and has a through hole 11 through which the shaft body 2 is inserted from the upper surface to the bottom surface, and a bolt tightening hole 12 having three screw grooves on the bottom surface.

Further, the tightening body 10 is a ring-shaped plate body having a through hole 13 through which the shaft body 2 is inserted, and a split groove 14 is formed in the through hole 13 from one side of the outer periphery. The tightening screw 15 for pulling both ends of the tightening body 10 forming the split groove 14 and fixing the tightening body 10 to the shaft body 2 is orthogonal to the split groove 14 and tightens the tightening body 10.
Is screwed into a screw hole 16 provided on the side of the.

A screw groove 17 is formed only on one side of the screw hole 16 so that the front side of the tightening screw 15 is screwed.
Reference numeral 18 is a clamp lever of the tightening screw 15.

Numeral 19 is a bolt insertion hole provided in the plate surface of the tightening body 10. The bolt insertion hole 19 is the holding body 9 described above.
It is provided at three places corresponding to the bolt tightening holes 12.
Then, the connecting bolt 20 is screwed into the bolt tightening hole 12 of the holding body 9 from the bolt insertion hole 19 of the tightening body 10 to connect the holding body 9 and the tightening body 10.

Next, the clamp device 3 is attached to the shaft body 2 so that the clamp device 3 is positioned at both ends of the core tube 7 of the plastic sheet 8 inserted through the shaft body 2. Loosen the tightening screws 15 of the tightening body 10 connected to the gripping body 10 from both sides of the shaft body 2 so that the upper surface of the frustoconical shape of the gripping body 9 faces the mouth end of the core tube 7. It is inserted and the upper surface side of the holding body 9 is press-fitted from the mouth end portion of the shaft body 2.

Then, the clamp lever 18 of the tightening body 10 is grasped and the tightening screw 15 is tightened,
If the core tube 7 is fixed to the shaft body 2, the core tube 7 is fixed to the shaft body 2. In the figure, reference numeral 21 is a support roller of a molding machine or the like that supports the shaft body 2 with the bearing portion 5, and 22 is a drive pulley provided on the tip side of the bearing portion 5 of the shaft body 2.

[0022]

According to the present invention, the shaft main body and the bearing portion are made of steel hollow tubes, and the bearing portions at both ends thereof have a wall thickness that can be supported with a plastic sheet or the like attached thereto, and the clamp is provided. Since the gripping body of the device is made of plastic, all parts are made of steel and the shaft part is considerably lighter than the round rod roll shaft, which makes it easy for elderly people and women to carry around easily. It was possible to reduce the work load and improve work efficiency.

Further, since the shaft is rustproofed and the gripping body of the clamp device is made of plastic, no rust is generated. Therefore, rust may adhere to the plastic sheet or the like, which may impair the commercial value of the molded product. It becomes a sanitary product. Further, there are various kinds of steel hollow tubes as ready-made products, and there is an advantage that the selection range is wide, and by selecting the steel tube having the required strength of each part, the weight can be reduced and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing a usage state of a roll shaft such as a plastic sheet of the present invention.

FIG. 2 is a partially enlarged sectional view of a roll shaft such as the plastic sheet of the present invention.

FIG. 3 is a sectional view of an essential part of a roll shaft of the present invention.

FIG. 4 is a partially enlarged side view of a roll shaft such as the plastic sheet of the present invention.

FIG. 5 is a side view of a gripping body for a roll shaft such as the plastic sheet of the present invention.

[Explanation of symbols]

1 roll shaft 2 shaft body 3 Clamp device 5 Bearing part 7 core tube 8 plastic sheets 9 holding body 10 tightening body 15 Tightening screw 23 Anticorrosion layer

Claims (3)

[Claims] 1. A roll shaft having a pair of left and right clamp devices for inserting a core tube around which a plastic sheet is wound, gripping an end of the core tube with a truncated cone-shaped gripping body, and fixing the core tube to a shaft. The roll shaft is composed of a shaft body and a bearing portion, and both the shaft body and the bearing portion are formed of a hollow steel tube, and the bearing portion is supported in a state where a plastic sheet or the like is attached to the shaft body. A roll shaft made of a plastic sheet or the like having a wall thickness having a possible strength. 2. A roll shaft such as a plastic sheet according to claim 1, wherein the steel hollow tube of the shaft main body and the bearing portion is subjected to anticorrosion treatment. 3. The grip body is made of plastic.
Alternatively, a roll shaft such as the plastic sheet described in 2.