JPH03227810A - Conveyor screw - Google Patents

Abstract

PURPOSE:To provide a flexible screw conveyor capable of conveying bottles and the like without damage by helically winding a coil around the outer periphery of a flexible shaft having magnetism to form a screw, and covering the screw with a resin layer formed of a thermal shrinkable tube. CONSTITUTION:A flexible shaft 11 attracted to a magnet and deformed in conformity with a curved track is formed of an iron rod, and a coil 12 is helically wound around the outer periphery thereof to form a screw. The outside of the screw is covered with a thermal shrinkable tube formed of polyvinyl chloride, through thermal shrinkage of the tube, the tube is adhered to the screw, and the screw is covered with a resin layer 13.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flexible conveyor screw which can be forced to rotate under magnetic retention and can be arranged in a bending manner.

BACKGROUND OF THE INVENTION As illustrated in FIG. At the same time, move the conveyor screw to the guide frame 2.
A trajectory is formed by adsorption and holding via a magnet 21 placed in the
By rotating the suction-held conveyor screw 1 by driving a motor or the like, a new conveyance system for plates and the like can be formed. Such a transfer system has the advantage that the conveyor screw 1 has excellent flexibility, so that it can be arranged in a bent manner, and a direction change trajectory such as a curved portion can be easily formed. The printing plate 3 is transferred, for example, by a method in which the printing plate is suspended between a pair of conveyor screws via a flange portion 31 provided at the neck portion. Note that 22 in the figure is an arm that supports the guide frame 2.

Problems to be Solved by the Invention The performance required of the conveyor screw described above is that it has magnetism that attracts a magnet so that it can be rotatably held via a magnet, and that it deforms while rotating to form and maintain a curved track. In addition to having good flexibility, it also has softness that does not damage objects to be transported such as printing plates.

Means for Solving the Problems The present invention has overcome the above-mentioned problems, and uses a heat-shrinkable tube to attach a screw made by winding a coil helically around the outer circumference of a flexible shaft exhibiting magnetism that attracts a magnet. The present invention provides a conveyor screw characterized by being coated with a resin layer consisting of:

By spirally winding a coil around the outer periphery of a flexible shaft that exhibits magnetism that attracts the working magnet, a screw shape is formed, which can be rotatably held via the magnet, and can also be deformed and curved under rotation. It is possible to form and maintain orbits and the like to make it hang.

Furthermore, by forming the surface layer with a resin layer made of a heat-shrinkable tube, it is possible to impart properties that do not damage objects to be transported such as printing plates.

Embodiment FIGS. 2 and 3 illustrate the conveyor screw of the present invention. 11 is a flexible shaft exhibiting magnetism that attracts a magnet;
12 is a coil spirally wound around the outer periphery of the flexible shaft, and 13 is a resin layer made of a heat-shrinkable tube.

The flexible shaft used in the present invention may be any material as long as it has the magnetism to be attracted to a magnet and the flexibility to deform during rotation to form and maintain a curved track or the like. Generally, a magnetic metal body such as iron or its alloy formed into a rod, stranded wire, pipe, etc., or a rubber body or a resin body mixed with magnetic metal powder is used. The outer diameter of the flexible shaft may be determined as appropriate depending on the size and weight of the object to be transported. If the object to be transported is a plate having a volume of 1e or less, an outer diameter of approximately lo+n+a is usually sufficient. The length of the flexible shaft is within a range that allows rotational force to be transmitted.

Generally, the length is 10 m or less, especially about 5 m. The flexible shaft may have a spiral groove for purposes such as positioning the coil.

There is no particular limitation on the material of the coil provided spirally around the outer periphery of the flexible shaft, and it may be magnetic, or
It is not necessary to have it. Generally, metal wires, resin wires, etc. are used. The outer diameter of the coil may be determined as appropriate depending on the degree of engagement required for smooth transfer of the object to be transferred (width of contact between the object to be transferred and the coil). In the case of bottle transfer, a coil having an outer diameter of about ⅓ of the flexible shaft is generally used. The coil may or may not be fixed to the flexible shaft with an adhesive or the like. The pitch of the spiral winding of the coil with respect to the flexible shaft is determined so that the object to be transferred is pushed out and transferred through contact with the spiral coil (at least, the pitch is such that the object is suspended between a pair of flexible shafts arranged with a gap between them). In the case of a partial print body corresponding to the flexible shaft of the transferred object, the end portion of the neck portion located on the flexible shaft side enters between the coils to form a hanging interval. Generally, it is 0.5 to 0.5 to the outer diameter of the portion of the object to be transported that corresponds to the flexible shaft (the neck in the case of a plate).
It is said to be about 5 times as large.

The conveyor screw of the present invention is a screw having a flexible shaft provided with a coil and covered with a resin layer made of a heat-shrinkable tube.

The above-mentioned structure in which the heat-shrinkable tube enclosing the screw is heat-shrinked to bring it into close contact with the screw, thereby forming a resin layer, provides excellent maintainability of the arrangement position of the coil with respect to the flexible shaft. can. The thickness of the resin layer to be formed is appropriately determined depending on the required strength and flexibility, and is generally 0.1 to 3M.

The heat-shrinkable tube can be formed by, for example, extruding a thermoplastic resin into a tube and stretching it in the radial direction, such as by increasing the diameter by blowing gas or the like.

The heat-shrinkable tube may be made of ordinary polymers such as polyvinyl chloride, polyethylene, cross-linked polyethylene, polyamide, and polyester, but it may also be made of engineering materials with excellent heat resistance such as polysulfone, polyphenylene oxide, polyphenylene ether, and polyether sulfone. Preferably, it is made of plastic or super engineering plastic. Particularly preferred is a resin having high mechanical strength, heat resistance, and abrasion resistance with a tensile strength of about 500 kgf/cd or more and a heat distortion temperature of about 100°C or more, especially about 130°C or more.

The conveyor screw of the present invention can be advantageously used, for example, in forming a transfer system as illustrated in FIG. The rotation of a pair of conveyor screws arranged with a predetermined gap can be driven by, for example, a method in which the ends of the conveyor screws are directly connected to the rotating shaft of a motor, or a method in which the ends of the conveyor screws are connected via a gear or the like.
You may proceed as appropriate. At this time, the pair of conveyor screws may be rotated in the same direction, or may be rotated in opposite directions as shown by the arrows shown in FIG. In the former case, the pair of conveyor screws are arranged such that the helical directions of the coils between them are in the same direction. In the latter case, a pair of conveyor screws are arranged so that the helical directions of the coils are opposite. In addition, a preferable method for transferring the object to be transferred is that the support and mounting table for the object to be transferred is omitted.
This is a method in which the object to be transported is held suspended between a pair of conveyor screws and transported. For this reason, the object to be transported is provided with a flan portion (31) or the like so as to be able to hang between the conveyor screws, as illustrated in FIG. 1, if necessary.

Effects of the Invention The conveyor screw of the present invention can form a part of the screw by spirally winding a coil around a flexible shaft, so it is easy to manufacture and has excellent mass production efficiency, and it is easy to change direction at curved parts etc. can be formed into Further, since the resin layer is provided on the outside, the object to be transported is not easily damaged, and since the resin layer is made of a heat-shrinkable tube, it is easy to replace it when it wears out. Therefore, a portion of the screw can be used repeatedly.

[Brief explanation of drawings]

FIG. 1 is a partially sectional perspective view illustrating the transfer system;
FIG. 2 is a cross-sectional view of the embodiment, and FIG. 3 is a partially sectional perspective view thereof. 1: Conveyor screw 11: Flexible shaft 12: Coil 13: Resin layer

Claims (1)

[Claims] 1. A conveyor screw comprising a screw formed by winding a coil helically around the outer periphery of a flexible shaft exhibiting magnetism that is attracted to a magnet, and coated with a resin layer made of a heat-shrinkable tube.