JPH0310445B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a belt-type material support device that suppresses the deflection of bar material that is supplied to an automatic lathe or the like by an automatic bar material feeder during feeding.

An automatic bar material feeder is a machine that continuously and automatically supplies bar material to an automatic lathe, etc. for machining bar material.In this case, when the bar material is machined by an automatic lathe, etc., the bar material is is subjected to rotational motion at a relatively high speed and is gradually fed in the axial direction in response to machining. Belt-type material support devices have been developed in the past as devices to prevent the bar material from wobbling when it is subjected to such rotational motion and axial feed motion (for example, −
No. 53282).

This conventional material support device is of a type in which the bar material is clamped between a pair of belts running opposite each other, so the clamping pressure that the bar material receives from the belts is large, and the bar material is easily pushed in the axial direction. In addition, due to the strong clamping pressure, the life of the belt is short, and especially when a bar material with a polygonal cross section is used, the life of the belt is extremely short.

Therefore, an object of the present invention is to provide a belt-type material support device that can easily feed the bar material in the axial direction with a small force without adopting a method of clamping the bar material, and that can extend the life of the belt. The goal is to provide the following.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a conventional belt-type material support device, in which a bar material 10 with a hexagonal cross section is stretched between pulleys 14 attached to a pair of arms 12, 12' that can be opened and closed in the direction of arrow A. A pair of belts 1
6 and 16'. In this conventional device, the bar material 10 is clamped and pressed between both belts, so although there is no problem in preventing runout, there is a drawback that the bar material 10 cannot be easily fed in the axial direction. However, since the frictional force exerted on the belts 16, 16' is large, the service life of the belts is short.

In contrast, FIGS. 2 and 3 show a belt-type material support device according to the invention. As shown in FIG. 2, upper pulleys 24, 24' and lower pulleys 26,
A pair of pulley support arms 28, 2 supporting the
8' is arranged, and each pulley support arm 28, 2
8' is the shaft 30, 3 passing through the upper pulley 24, 24'.
0', it is pivotally attached to the support plate 22.

One pair of upper and lower pulleys 24-26 and 24'-
Belts 32 and 32' are stretched over 26', respectively. The distance between each pair of pulleys 24-26 and between 24'-26' can be adjusted in order to adjust the tension of the belt and to reduce the impact force when the bar material impacts the belt. An adjustment mechanism is provided on each pulley support arm 28, 28', but has been omitted for clarity of drawing.

Each pulley support arm 28, 28' has a shaft 30,
30' as the pivot point, the position shown by the solid line in FIG. 3 (for arm 28) and the position shown by the dotted line (for arm 2
8') to the position shown by the dashed line in the direction shown by arrow B. The movement of simultaneously swinging the pulley support arms 28, 28' from the open position shown by the solid line and the dotted line, respectively, to the closed position shown by the dashed-dotted line and in the opposite direction is as follows:
This is accomplished by a series of mechanisms from torque motor M through appropriate gear trains to each pulley support arm 28, 28', which has been omitted for clarity. When the torque motor M rotates in one direction, each pulley support arm 28, 28' moves synchronously in one direction (for example, the opening direction), and when it rotates in the opposite direction, it moves synchronously in the opposite direction (for example, the opening direction). For example, it moves in the closing direction).

As shown in FIG. 2, the material support device 2 of the present invention
0 is provided at several locations along the main guide rail 34 arranged along the longitudinal direction of the bar material automatic feeder (not shown) to prevent vibration during bar material processing. However, depending on the diameter of the bar material to be processed and the machining conditions, it may not be necessary to use the material support device of the present invention. In such a case, if the material support device of the present invention is placed in the "open" position, the belt will not be used and its life will be extended. For such a case, the support plate 22 of the material support device of the present invention is provided with an intermediate guide rail 36.
is provided, and the bar material is the main guide rail 34.
and is supported within intermediate guide rails 36. A resin lining layer 38 is provided on the inner peripheral surfaces of the main guide rail 34 and the intermediate guide rail 36 so as not to scratch the bar material.

FIG. 3 clearly shows a state in which a bar material 40 having a hexagonal cross section is supported by the material supporting device 20 of the present invention. When the bar material 40 is machined while being rotated in the direction of the arrow C, the belts 32 and 32', which are in the closed position, receive driving force from the bar material 40 when they come into contact with the bar material 40, and the belts 32 and 32', which are in the closed position, receive driving force from the bar material 40, respectively. It is driven in the direction shown by D'. Belts 32 and 32' are connected to pulleys 24-26 and 2, respectively.
4'-26' so that it can be rotated freely with a light force, it can be easily rotated by receiving the driving force from the bar material 40.

As is clear from FIG. 3, the state in which the bar material 40 is supported by the material support device 20 of the present invention is not in the clamping state as in the conventional device shown in FIG. Near the intersection of the two belts, it appears as though it is being placed on top of both belts. Therefore, the bar material 40 can be easily fed in the axial direction with extremely light force. In addition, excessive pressing force is not applied to the belt itself compared to the conventional clamping pressure method, so
The life of the belt can be extended.

The bar material 40 swings between the belts 32, 32' and comes into contact with either one of the belts 32 or 32', or both belts 32, 32' at the same time.
32', but the bar material 40
is always subject to a downward force due to gravity,
Since the bar material 40 is alternately subjected to forces acting to wind it up from the partner belt, supporting the bar material as in the present invention is extremely effective in preventing swinging of the bar material. It is possible to obtain excellent effects.

[Brief explanation of the drawing]

FIG. 1 shows a state in which a bar material is supported by a conventional belt-type material support device. Second
The figure is a schematic plan view of the belt-type material support device of the present invention. FIG. 3 is a view seen from the direction of FIG. 2. 24, 24', 26, 26'...Pulley, 30, 3
0'... Pivot, 32, 32'... Belt.

Claims (1)

[Claims] 1. At least two pairs of pulleys that can rotate freely and are arranged in pairs above and below, and a belt stretched between the pulleys forming each pair, and The shafts of the pulleys located at A cavity is formed through which the bar material can pass, and each of the belts can be swung in a direction intersecting each other and in the opposite direction in synchronization with each other about each axis of the upper pulley by a drive device. A belt-type material support device configured as follows.