JPH0375281B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a belt-type bar material support device for preventing rotational vibration of bar material supplied by a bar material feeder.

BACKGROUND ART A bar material feeder is used to sequentially and continuously supply bar material to a bar material processing machine for manufacturing various mechanical parts such as screws from a single bar material. When the bar material feeder supplies the bar material, the bar material continues to be rotated at a predetermined rotational speed given by the bar material processing machine. This rotational speed varies depending on the outer diameter of the bar material, but it is a high speed reaching from several thousand rpm to tens of thousands of rpm. Therefore, while the bar material is being supplied, the bar material is subjected to severe rotational vibration due to centrifugal force. The present invention relates to a belt type bar support device for preventing this rotational runout.

As a belt-type support device for preventing the rotational runout of the bar material, there is one disclosed, for example, in Japanese Utility Model Publication No. 53282/1982. This belt-type support device was constructed so that the bar was forcibly wrapped between belts stretched between belt pulleys fixed to a pair of arms that opened and closed around a single pivot point. Although it can be expected to have the effect of forcibly suppressing the rotational runout of the bar material, the first problem is that the contact area and contact pressure between the bar material and the belt are too large, resulting in an extremely short belt life. This is a drawback. In addition, in order to adapt to the different diameters of the bar material to be supplied, a method is adopted in which the belt tension is changed using a separately installed tension pulley, which makes the mechanism complex and can accommodate a wide range of diameters. The second drawback is that it cannot be applied to bar materials.

Another prior art related to a belt-type bar material support device is disclosed in Japanese Patent Laid-Open No. 58-223505 by the applicant of the present application. In this method, the rotational runout of the press can be reduced by configuring the belt so that it hits the bar material in the direction where its amplitude is greatest (in general, the amplitude is greatest in the lateral direction, where it is not affected by gravity). Developed with the focus on the fact that it is possible to sufficiently suppress rotational runout without using a forced stopping method such as wrapping the bar material with a belt like the device disclosed in Publication of Utility Model Publication No. 55-53282. It is what was done. The device disclosed in Japanese Patent Application Laid-Open No. 58-223505 is configured so that the belt tension section (running surface section) is V-shaped.
Since the contact area and contact pressure between the belt and the bar material can be reduced, the life of the belt can be significantly extended, but the space in which the bar material is supported is
Because it is shaped like a letter, it has the disadvantage that the bar material tends to escape upwards.

Therefore, the first object of the present invention is to effectively prevent the bar material from swinging in the lateral direction, and at the same time to prevent it from swinging in the vertical direction, by making the tension part of the belt that supports the bar material form an inclined parallel surface. It is an object of the present invention to provide a belt-type bar material support device which can greatly extend the life of the belt by supporting the belt under small contact area and contact pressure.

A second object of the present invention is to provide a belt-type bar material support device that can be easily adapted to bar materials of a wide range of diameters by changing the inclination angle of the tensioned portion of the belt.

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

As shown in the figure, the belt-type bar material support device 10 of the present invention includes a first support body that supports a pair of belt pulleys 12a, 12b and a belt 14 stretched between the belt pulleys 12a, 12b. 16 and similarly 1
A pair of belt pulleys 12a', 12b' and the belt pulley 12
It has a second support body 16' that supports a belt 14' stretched between a' and 12b'. The first support 16 and the second support 16' are connected to the bar material 1.
Regarding the supply passage No. 8, that is, the guide rail 20, the tension portion (running portion) of the belts 14, 14'
are arranged so as to face each other. Further, the first support body 16 is pivotally attached to the base 24 of the device 10 at a position where the support shaft 22 of the lower belt pulley 12b is provided. The second support 16' is attached to the base 2 at a position where the support shaft 22' of the upper belt pulley 12b' is provided.
It is pivoted to 4. Arms 26, 26' are attached to the support shafts 22, 22', respectively, and these arms 26, 26' are integrally fixed to the first and second supports 16, 16', respectively. ing. Slots 28 and 28' are formed at the lower ends of the arms 26 and 26', and a piston rod 3 of a driving source, that is, a hydraulic (or pneumatic) cylinder 30 is inserted into the slots 28.
Pins 36, 36' implanted in a drive plate 34 fixed to 2 are fitted.

Therefore, when the piston rod 32 of the cylinder 30 is retracted, the first and second supports 1
When piston rods 6 and 16' are in the open position shown in solid lines in the drawing (i.e., the position where the bar material is received between the belts) and the piston rod 32 is extended,
The first and second supports 16, 16' can be driven into a closed position (i.e., supporting the bar 18 between the belts) shown in broken lines in the figures.

As is clear from the illustrated arrangement, by varying the stroke of the piston rod 32, the distance D between the belt tensions can be varied. Therefore, if it is desired to change the shaft diameter of the bar material 18 to be supplied, the stroke of the piston rod 32 can be changed. Adjustment of this stroke is effected by a stop or screw 38 on the base 24. That is, by changing the distance L between the tip of the screw 38 and the tip of the piston rod 32, a desired distance D between the tensioned portions of the belt can be obtained.

Incidentally, screws indicated by numbers 40 and 40' in the drawings are screws that allow the tension of the belts 14 and 14' to be adjusted by changing the positions of the belt pulleys 12a and 12a'.

Since the belt-type bar material support device of the present invention is configured as described above, the tensioned portion of the belt forms an inclined parallel surface while supporting the bar material 18, so that the horizontal direction of the bar material 18 is simply Since it is possible to effectively prevent not only vertical runout but also vertical runout, rotational runout of the bar material can be minimized. Further, since the bar material and the belt come into contact with each other with a small contact area and contact pressure, it is possible to extend the life of the belt.

Furthermore, by changing the pivot angles of the first and second supports, the spacing D between the tension parts can be easily changed, so that it is possible to easily adapt to a wide range of bar material diameters.

[Brief explanation of drawings]

The drawings show the belt-type bar material support device of the present invention,
FIG. 3 is a schematic view of the bar material supply passage viewed from the axial direction. 12a, 12a', 12b, 12b'... Belt pulley, 16... First support body, 16'... Second support body, 26, 26'... Arm, 38... Stop piece (adjustment screw) .

Claims (1)

[Claims] 1. In a belt-type bar material support device provided in a bar material supply passage of a bar material supply machine, a first belt supporting a pair of belt pulleys and a belt stretched between the belt pulleys. and a second support, the first and second supports are arranged such that the tensioned portions of the belt face each other with respect to the bar material supply passage, and either of the supports One has a pivot center at its lower end, and the other has a pivot center at its upper end, and the two supports have their respective belt tensions reciprocated about their respective pivot centers. 1. A belt-type bar support device, wherein the belt-type bar support device is pivotable between an open position for receiving the bar material and a closed position for supporting the bar material while maintaining a substantially parallel relationship with the bar material. 2. In a belt-type bar material support device provided in a bar material supply passage of a bar material feeder, first and second supports support a pair of belt pulleys and a belt stretched between the belt pulleys. The first and second supports are arranged such that the tensioned portions of the belts face each other with respect to the bar material supply passage, and one of the supports has a lower end thereof. one having a pivot center, the other having an upper end thereof as a pivot center, and the two supports having their respective belt tensions substantially parallel to each other about their respective pivot centers; The belt is pivoted between an open position for receiving the bar material and a closed position for supporting the bar material while maintaining the same, and the pivot angle of both supports is adjusted by an adjustable stop piece. Type bar material support device.