JPH08143283A - Overhead traveling device - Google Patents

Abstract

PURPOSE: To prevent a winding up belt for ascending/descending a holding portion from being drawn out excessively from a drum. CONSTITUTION: In the case of a winding up belt 7 being wound around a drum 6 provided at a truck, a reflection plate 10 is affixed to the position of the drawing out limit portion of the winding up belt 7 at what suspends a holding portion to hold a member, and a sensor 11 that possesses a light projector and a light receiver is provided at the truck.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead traveling apparatus and has an improved lifting means.

[0002]

2. Description of the Related Art An overhead traveling apparatus is known as an apparatus having an elevating means which moves by traveling on a ceiling and elevates a gripping portion for gripping a member. The structure of the overhead traveling device is shown in FIG. As shown in the figure, a carriage 2 is attached so that it can travel along the rails 1, and a lifting means 3 is provided on the carriage 2. Wheels (not shown) mounted on the rail 1 are provided on the upper portion of the truck 2, and the wheels are linked to a motor (not shown) housed in the truck 2.

The raising / lowering means 3 is as follows. A gripping part 5 is provided, which is provided with a pair of hands 4 that open and close by a drive part (not shown) to grip the member. A pair of drums 6 are provided on the carriage 2 to move the gripping part 5 up and down. The end of the wound winding belt 7 is connected to the grip 5. A motor (not shown) is linked to the drum 6.

A winding belt 7 is wound around each drum 6 as shown in FIG. With the end of the winding belt 7 sandwiched between the drum core 6a having a cross-sectional shape in which a part of the arc is cut out and the belt presser 6b, the belt presser 6b is attached to the drum core 6a via the bolt 8. Are combined. The take-up belt 7 is unwound via an auxiliary roller 9, and an unillustrated encoder attached to a motor for driving the drum 6 detects the unwinding end end (belt end) of the take-up belt 7, and the winding belt 7 is wound up further. The take belt 7 is designed so as not to be drawn out. At the belt end, the winding belt 7 is wound around the drum 6 at least 2-3 times.

[0005]

However, the winding belt may be fed out past the belt end when the value of the encoder is deviated due to an abnormality of the CPU or the like, and as a result, as shown in FIG. In this state, the take-up belt 7 may be bent at an acute angle by the edge portion 6c of the belt retainer 6b and damaged.

Therefore, an object of the present invention is to provide an overhead traveling apparatus that solves the above problems.

[0007]

The structure of the present invention for attaining such an object is to provide a carriage movably on a rail arranged on a ceiling, a drum rotatably driven on the carriage, and a member. Detection for detecting the belt end of the take-up belt in a ceiling traveling device in which the other end of the take-up belt is joined to the drum to connect the other end to the drum and the take-up belt is wound around the drum. While the unit is formed on the winding belt, a sensor for detecting the detecting unit and stopping the rotation of the drum is provided.

[0008]

The operation of the drum causes the take-up belt to be unwound from the drum, whereby the gripping portion is lowered. Even if the encoder is abnormal, when the take-up belt reaches the feeding limit, the sensor detects the detecting portion formed on the take-up belt and stops the rotation of the drum. For this reason, it is possible to reliably prevent the winding belt from being overwound.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. Since the present embodiment is an improvement of a part of the conventional overhead traveling apparatus, the same parts as those of the related art will be designated by the same reference numerals and description thereof will be omitted, and only different parts will be described.

FIG. 1 shows the structure of an overhead traveling apparatus according to the present invention.
Shown in In order to prevent the take-up belt from being overwound from the drum even if the value of the encoder deviates, a seal-like reflection plate 10 is provided as a detection unit at the take-up limit of the take-up belt as shown in the figure. It is attached. On the other hand, at a position below the carriage 2 and facing the reflection plate 10 in the figure, a sensor 11 including a projector and a light receiver is provided.
It is installed by being attached to. This is such that when the light emitted from the light projector is reflected by the reflection plate 10, the light receiver detects it.

Next, the operation of such an overhead traveling device will be described. When the take-up belt 7 is fed from the drum 6 beyond the belt end without the encoder properly operating, the reflection plate 10 attached to the take-up belt 7 faces the sensor 11 as shown in FIG. When it descends to the position
The light emitted from a projector (not shown) inside the reflector 1
It is reflected by 0 and enters into a light receiver (not shown) in the sensor 11, and the feeding limit of the winding belt is detected by this. The motor for rotating the drum 6 is stopped based on this detection, and the drum 6 is stopped. For this reason, it is possible to prevent the take-up belt from being unreeled from the drum 6. Here, since the reflection plate 10 has a seal shape, it does not hinder the winding of the winding belt 7.

In this embodiment, a reflecting plate is attached to the take-up belt to reflect light. However, the take-up belt is formed with a hole having a size that does not hinder the strength. The light emitter and the light receiver may be arranged at a position sandwiched between.

[0013]

As can be seen from the above description, according to the overhead traveling apparatus of the present invention, the winding belt is provided with the detecting portion and the sensor for detecting the detecting portion is provided.
Even if a failure occurs in the encoder, the take-up belt is prevented from being overwound from the drum. Therefore, the winding belt does not reversely wind around the drum, and the winding belt is not damaged at the edge portion of the belt presser, for example.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a main part of an overhead traveling device according to the present invention.

FIG. 2 is a configuration diagram of an overhead traveling device.

FIG. 3 is a configuration diagram showing a main part of a conventional overhead traveling device.

FIG. 4 is an operation explanatory view of a conventional overhead traveling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rail 2 ... Cart 5 ... Gripping part 6 ... Drum 7 ... Winding belt 10 ... Reflector 11 ... Sensor

Claims (1)

[Claims] 1. The other end of a take-up belt having a carriage provided on a rail disposed on a ceiling so that the carriage can travel, a drum driven to rotate by the carriage, and one end of which is coupled to a gripping portion for gripping a member. In the ceiling traveling device in which the winding belt is wound around the drum by connecting the winding belt to the drum, the detection unit for detecting the belt end of the winding belt is formed on the winding belt, and An overhead traveling device having a sensor for stopping rotation.