JPH07315549A - Oblique entry prevention device for work in the work feeder - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent a work from entering the work feeding device at an angle and prevent various inconveniences. [Structure] A pair of touch type limit switches 19a, 19b are provided above the front ends of the pair of left and right screw rods 1, 1 respectively.
And a pair of touch-type limit switches 19
Work W on the feeler rubber 20a, 20b extending from a, 19b
When the workpiece W comes into contact with the screw 1a, it is detected that the workpiece is properly placed on the screw 1a. When the workpiece W comes into contact with either one of the feelers 20a and 20b, the oblique insertion of the workpiece is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supplies a work cut into a predetermined size by a cutting machine to the upper surface of a screw rod and sends the work one by one to the next process by rotating the screw rod. Of the present invention relates to a device for preventing a workpiece from obliquely entering.

[0002]

2. Description of the Related Art For example, an engine valve is manufactured by cutting a long rod-shaped material into a predetermined size by a cutting machine and then forming it into an intermediate product having one end expanded by an electric compression machine. After being inserted into the mold and pressed, it is finished into the original valve product.

In this manufacturing process, if burrs are generated at the end of the cut work, the work is not smoothly inserted into the die of the press, and correct molding cannot be performed. Therefore, the end surface of the work is chamfered. It is necessary to remove the burr and then send it to the next process.

In order to remove these burrs efficiently, the applicant of the present application has found that an automatic chamfering machine capable of removing burrs generated at both ends of a work at once (see Japanese Patent Application Laid-Open No. 4-135557).
Furthermore, an automatic chamfering machine with a work feeder (actual flat 4
-91516).

In these automatic chamfering machines, a workpiece placed on a thread of a pair of parallel threaded rods is conveyed in a certain direction by a screw feeding action, and is provided on both sides in the middle thereof. Both ends of the work are chamfered by a grinding wheel. When this is used, the work can be chamfered sequentially and continuously.

The chamfering machine will be briefly described with reference to FIG. 1 in connection with its feeding device. A large number of workpieces cut into a specified length by a workpiece cutting machine (not shown)
(W) is conveyed to the work supply device (B) and is positioned by the positioning plate
Both ends are regulated by (9) and they are aligned and stored.
The stored work (W) rolls out one by one from below the vibrating block (10) due to its own weight, and the work aligning plate (1)
1), the work (W) in the front row is aligned with the stopper plate (1).
It comes into contact with (2), stops, and enters the standby state. Next, the pressing rod (13) provided on the lower side operates upward to move the work in the front row.
When pushing (W) up, this work (W)
Roll over 2) and place longitudinally on the belt (15) of the conveyor (14).

Work (W) carried by a rotating belt (15)
Comes into contact with the stopper (16) and stops, the air cylinder (17)
The work (W) is ejected to the side of the belt (15), rolls down on the inclined guide plate (18), and moves at the same speed in the same direction in the work feeding device (C) with respect to the chamfering machine (A). The threaded rods (1a) (1a) at the base ends of the pair of screw rods (1) (1) rotating at. The work (W) thus fed to the chamfering machine (A) is fed in the axial direction thereof as the screw rods (1) and (1) rotate, and is moved by the left and right grinding wheels (4) and (4). , Both ends are chamfered in sequence.

[0008]

The work as described above
When (W) is fed into the work feeding device (C) from above the conveyor (14), as shown in FIG.
There is no problem if it is inserted into the thread (1a) (1a) at the base end of the thread at right angles to (1). However, the work (W) is
It is repelled by 7) and rolls down on the inclined guide plate (18) to incline with respect to the screw rods (1) and (1), so that one end of the work (W) and the base end are There is a case where the threaded rods (1a) of the adjacent screw rods (1) are fitted in different phases. This state is shown by the symbol (Wb) in FIG. If such a slanting of the work occurs, chamfering will not be performed correctly, and the abrasive grains of the grinding wheel (4) will peel off, shortening the life of the grinding wheel and making the work that comes afterwards heavy. Grinding wheel (4)
There is a case where the work (W) accumulates on the conveyor (4) and falls onto the floor surface due to the contact with the workpiece.

An object of the present invention is to prevent the work from entering the work feeding device at a slant, thereby preventing various inconveniences caused by the work.

[0010]

In order to achieve the above object, the present invention provides a pair of left and right screw rods arranged in parallel with each other on the upper surface of the screw thread in a direction orthogonal to the screw rod. In the work feeding device in which the two round rod-shaped workpieces are moved forward by rotating both screw rods in the same direction in synchronization with each other, in the vicinity of the feed side end portions of the both screw rods, each end portion of the workpiece is provided. Or, a portion close to it is provided with a pair of left and right sensors that operate by detecting that it is supplied in the correct posture on the threaded rod, and only one of the two sensors operates independently to rotate the threaded rod. It is characterized in that a control device for stopping it is provided.

[0011]

According to the present invention, one of the left and right ends or both ends of the work does not fit into the thread at the feed-side end of the pair of left and right screw rods of the work feeding device, and When the thread enters the thread, the corresponding sensor does not work,
As a result, the oblique insertion of the work is detected. The control device operates based on this detection signal to stop the rotation of the screw rod.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, (A) shows an automatic chamfering machine (hereinafter abbreviated as chamfering machine), and (C) shows a work feeding device. On a base (not shown), the equal pitches are arranged in parallel with each other. The screw rods (1) (1) of the
The lower part of is the front. ) Is pivoted. Both screw rods (1) and (1) are rotated at a constant speed in a counterclockwise direction from the front by a reduction motor (2).

The moving bases (3) and (3), which are provided on the base on the outer sides of the two screw rods (1) and (1) at different front and rear positions, are parallel to the screw rods (1), respectively. A grinding wheel (4) is provided, and each grinding wheel (4) is rotated by a motor (not shown).

Two guide plates (5) and (5), which are perpendicular to the front-rear direction, are fixed to the upper surface of the inner end of each movable table (3) so as to sandwich the grinding wheel (4) from the front and back. ing. Above the space between the two screw rods (1) (1), an endless presser belt (6) facing the front-rear direction is provided by a motor (7) so as to rotate backward and upward. There is. Reference numeral (8) indicates a V-shaped work discharge chute which is provided close to the side of the rear end portion of the left-hand screw rod (1).

A pair of screw rods in the work feeder (C)
(1) A pair of left and right touch-type limit switches (19a) and (19b) as sensors are arranged near the base end which is the front end of (1). In the illustrated embodiment, the pair of touch-type limit switches (19a) and (19b) are arranged outside the threaded rods (1) and (1). It may be arranged inside.

Touch type limit switches (19a) (19b) are
As shown in FIGS. 2 and 3, a relatively long feeler rubber
(20a) and (20b) are provided, and the work (W) sent by the conveyor (14) is repelled by the air cylinder (17) and drops on the inclined guide plate (18), and the feeler rubber ( When the touch type limit switches (19a) and (19b) are activated, the touch type limit switches (19a) and (19b) are activated.

That is, as shown in FIG. 3, each of the touch type limit switches (19a) and (19b) is provided with an inclined guide plate (1).
Directly below 8), it is attached to the base with a bracket (21), and its feelers (20a) (20b) are screwed at the base end of the screw rod (1) below the inclined guide plate (18). Article (1
It extends above a).

When the work properly falls into the thread (1a) at the front end of the screw rod (1) as shown by the reference numeral (Wa) in FIG. 3, the feeler rubber (20a) is imagined by the weight of the work. It turns on by rotating from the line position to the solid line position. However, as shown by the solid line in FIG. 2, if one end side of the work (Wb) is fitted into the thread (1a) of the adjacent screw rods having the different phases, the feeler (of the touch type limit switch (19b) ( 20
Do not touch a). In other words, feeler rubber (20a) (20
The length of b) and the directivity angle are set so that such a relationship is established.

The workpieces come into contact with both feeler rubbers (20a) and (20b) at the same time, and touch type limit switches (19a) (19
When b) is activated (state shown by solid line in FIG. 1 and state shown by dotted line in FIG. 2), the work piece is normally screw rod (1) (1).
It has been placed on the top, the screw rod (1) continues to rotate,
Regular chamfering is performed.

However, when the work (W) does not abut one of these feelers (20a) and (20b), it means that the work enters diagonally and is not in a normal state, and the touch type limit switch ( The conditions of simultaneous operation of 19a) and (19b) are not satisfied, and an output signal from the same causes an unillustrated control device to operate, which immediately stops the rotation of the screw rods (1) and (1) to operate the chamfering machine. At the same time as stopping, the warning light is turned on or an alarm is issued.

Even when the work (W) is normally placed on the thread (1a), the touch-type limit switches (19a) (19b) are operated due to the difference in the dropping speed on both sides of the work (W). It is conceivable that the screw rods (1) do not operate at the same time and the rotation of the screw rod (1) stops. However, as in known means, a timer is provided and one limit switch operates independently, and then the other limit switch operates. If a time lag until the limit switch is activated is detected and it is regarded as normal when it is within the set value, such a defect is eliminated.

[0022]

According to the present invention, when a work obliquely enters the thread of the work feeding device, the sensor is actuated to immediately stop the rotation of the screw rod and prevent the work from being fed to the next process or the like. Since it prevents, for example, in a chamfering machine, it is possible to completely eliminate the occurrence of defective products in the work, and also without the separation of the abrasive grains of the grinding wheel due to the oblique entry
It becomes possible to remarkably extend its life.

[Brief description of drawings]

FIG. 1 is a plan view showing a chamfering machine and a work feeding device to which the present invention is applied, and a work feeding device that feeds a work thereto.

FIG. 2 is an enlarged plan view of the work feeding device on the base end side.

FIG. 3 is a vertical sectional side view taken along the line III-III in FIG.

[Explanation of symbols]

 (1) Screw rod (1a) Thread (2) Reduction motor (3) Moving base (4) Grinding wheel (5) Guide plate (6) Presser belt (7) Motor (8) Work discharge chute (9) Positioning plate (10) Vibration block (11) Work alignment plate (12) Stopper plate (13) Push-up rod (14) Conveyor (15) Belt (16) Stopper (17) Air cylinder (18) Inclined guide plate (19a) (19b) Touch type limit switch (20a) (20b) Feeler rubber (A) Chamfering machine (B) Work feeding device (C) Work feeding device (W) (Wa) (Wb) Work

Claims (1)

[Claims] 1. A round bar-shaped workpiece supplied in a direction orthogonal to the threaded rods is provided on the upper surfaces of the threads of a pair of left and right threaded rods arranged in parallel with each other by synchronizing the two threaded rods with each other. In the work feeding device, which is made to move forward by rotating in the same direction, each end of the work or a portion close to it is fed in a correct posture on the screw rod near the feed-side ends of the both screw rods. A pair of left and right sensors that detect and operate
And by operating only one of both sensors independently,
A device for preventing oblique entry of a work in a work feeding device, characterized in that a control device for stopping rotation of a screw rod is provided.