JPH0718493Y2 - Nut thread cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an apparatus for threading a nut.

[Conventional technology]

Conventionally, the nut material supplied on the processing table is pushed out to the receiving body with the first piston that can move back and forth, and thread cutting is performed, the chips are naturally dropped under the table, and the processed nut is moved forward and backward with the second piston. There is known a nut threading device for pushing and collecting in a direction perpendicular to the path of the first tail, but such a conventional device is a nut material that is processed by being sandwiched between a first piston and a receiving body. Since the upper surface and the left and right side surfaces are in a bare state with no enclosure, chips or chips easily remain at the thread cutting location.Particularly, since the nut material is not fixed in the vertical direction, stepping on the chips or chips, or When they are sandwiched between the nut material and the receiving body, the center line of the nut material that is originally threaded should be vertical, but the center line tilts. Threading is made inclined, nuts become cases has occurred defective.

[Problems to be solved by the device]

In view of the above-mentioned problems of the prior art, the first object of the present invention is to provide a device capable of performing thread cutting with the center line of the nut material kept vertical.

A second object of the present invention is to provide a device capable of cleaning a threaded nut on the processing table.

[Means for Solving the Problems]

In the nut thread cutting device of the present invention, the means adopted to solve the above problems will be described below with reference to FIGS. 1 and 2 as an example.

(1) A tap 3 for threading provided vertically directly above the threading place 2 on the processing table 1, a chute 5 for supplying the nut material 4a onto the processing table 1, and a supplied nut material 4a for the threading site 2 The first piston 6 that can be pushed back and forth, the receiving rod 7 that can be pushed back and forth to receive the nut material that has been pushed out and be used for threading, and the forward and backward movement that pushes the processed nut 4b in a direction perpendicular to the path of the first piston 6. In the device with the second piston 8, the threading location 2
Is on the side of the path of the second piston 8, the path of the receiving rod 7 is on the same straight line as the path of the first piston 6, and the elastic body 9 such as a spring, the backward stopper 10, and the forward stopper 11 are provided. , 12 and are attached, the first
The elastic material 9 is contracted by pressing the piston 6, and the nut material
4a is transferred to the threading place 2, and the elastic body 9 is extended by releasing the pressure of the first piston to move the processed nut 4b to the second position.
It shall be transferred to the path of the piston 8, and the second piston 8
A pair of nut material insertion barriers 13 and 14 are fixed to the sides of the first piston 6 oppositely to each other with the threading place 2 interposed therebetween.
It is composed of a bent plate (see FIG. 1) that comes into contact with the upper surface and the side surface of the nut material 4a that is pushed out by and is inserted into the barrier with a very small clearance that can be inserted. The nut material 4a extruded by the first piston 6 is formed so that the tip end surfaces 6a, 7a of 7 are in contact with the contact surface of the nut material.
A threading timing detection switch 15 is provided for activating the tap 3 when it reaches the threading location 2 through the barriers 13 and 14.

(2) In the device described in (1) above, a feeding chute 16 for the processed nut is provided in front of the path of the second piston 8.
And a nut fixing device 1 for sandwiching the processed nut 4b extruded by the second piston 8 on both sides of the chute.
A machined cleaning device 22 for the machined nut, which is provided with 7 and 18 facing each other, and which is composed of a cleaning rod 19 composed of a rod of a fluid pressure cylinder and compressed air blowing nozzles 20 and 21 directly above the holding portion.
To provide.

[Action]

The catch rod 7 is retracted by the pressing force of the first piston 6 that pushes out the nut material 4a, but is stopped by the action of the retraction stopper 10, and the nut material 4a is threaded at the location 2
Can be located at. When the first piston 6 is retracted after the thread cutting is completed, the receiving rod 7 advances due to the repulsive force of the elastic body 9 which has been released from the pressing, but the advance stopper
By the actions of 11 and 12, the forward movement can be stopped and the processed nut 4b can be positioned on the path of the second piston 8.

Since the nut material insertion barriers 13 and 14 are fixed to the side of the path of the second piston 8, they do not prevent the second piston 8 from moving back and forth.

The cleaning rod 19 pushes down the chips when the chips are caught in the hole of the nut, and the compressed air blown from the nozzles 20 and 21 blows off the chips remaining in the thread groove.

Next, the movement of the main members will be described with reference to FIGS. (Fig. 3) The nut material 4a supplied on the working table is pushed out by the first piston 6 to reach the thread cutting place,
It is threaded. (Fig. 4) As the first piston 6 retreats, the receiving rod 7 advances and the processed nut 4b
On the path of the second piston 8. New nut material 4a is fed in front of the first piston 6. (Fig. 5) The second piston 8 advances and pushes the processed nut 4b to the cleaning place. (FIG. 6) The second piston 8 retracts. Referring back to FIG. 3, the shield ring is repeated, and the cleaned and processed nuts are sequentially pushed out and stored. The timing of advance / retreat of the first piston and the second piston is based on a command from a limit switch or a sensor.

〔Example〕

In FIGS. 1 and 2, the nut blank 4a has pre-drilled holes. The nut material feeding chute 5 is connected to a hopper (not shown). The advance and retreat of the first piston 6 and the second piston 8 is driven by the air cylinder. The forward / backward stopper 11 is composed of a double nut. The other forward stopper 12 that engages with this forward stopper also serves as a support plate for the spring 9 fitted to the receiving rod 7.
As the elastic body, for example, an air cylinder can be used instead of the spring 9. Barrier for inserting nut material 1
The upper surfaces of 3 and 14 have a space at least at the threading place 2. The tip surfaces of the first piston 6 and the receiving rod 7 are
For example, in the case of a hexagon nut, it is formed into a square concave surface as shown in the figure, and in the case of a round nut, it is formed into a circular arc concave surface. A limit switch 15 is provided in engagement with the first piston 6 as a thread cutting timing detection switch. This limit switch is made of nut material
It will only work when 4a exactly reaches threading location 2. A sensor can be used instead of the limit switch.

Each of the nut fixing devices 17 and 18 is a rod body having a tip surface formed in a shape that allows the nut to come into close contact with the nut. A fluid pressure cylinder may be used instead of the spring.

In the figure, 25 is a container for receiving falling chips and chips, and 26 is a plate for receiving a nut material supplied from the chute 5 in front of the first piston 6.

[Effect of device]

 The effects of the present invention will be described below.

(1) The nut material 4a that has reached the thread cutting location 2 has a front surface in close contact with the front end surface of the receiving rod 7 and a rear surface in contact with the front end surface of the first piston 6, and the left and right surfaces and the upper surface are the nut material insertion barriers 13, Since it has an area with an extremely small clearance with respect to the surface of 14, there is almost no room for chips or cutting chips generated by thread cutting to enter between the nut material and the surface surrounding it, and even if very fine cutting chips are provided. Even if it gets in, it does not mean that the center line of the nut material is tilted from the vertical state beyond the allowable limit and a defective processed product is generated.

(2) If chips or chips that tilt the center line of the nut material from the vertical state beyond the allowable limit exist at the thread cutting location, the nut material will enter between the barriers 13 and 14. Even if it does not exist, or even if it enters, the thread cutting location cannot be reached, so the thread cutting timing detection switch does not operate and thread cutting is not performed. Even if the nut material does not exist on the front surface and the first piston 6 moves forward and pushes idle, the detection switch once turned on immediately turns off and the tap operates. Since it is stopped, the miss operation of the tap does not occur.

According to the above (1) and (2), the present invention can prevent the occurrence of defective processed products and the incorrect operation of the tap due to the center line of the nut material tilting.

(3) Compared with the conventional method in which the cleaning device 22 for the processed nuts is provided on the processing table, the cleaning is performed once after the collection,
It is possible to perform a thorough line-by-line cleaning.

[Brief description of drawings]

FIG. 1 is a front view of the device of the present invention showing a part in cross section, FIG. 2 is a plan view of the same, and FIGS. 3 to 6 are explanatory views schematically showing movements of main members. 1 ... Machining table, 2 ... Threading location, 3 ... Tap, 4a ... Nut material, 4b ... Machined nut, 5 ... Supply chute, 6 ...
1st piston, 6a ... Tip surface of 1st piston, 7 ... Receiving rod, 7a ... Tip surface of receiving rod, 8 ... Second piston, 9
… Elastic body (spring), 10… Retraction stopper, 11, 12
… Advance stopper, 13, 14… Nut material insertion barrier, 15
… Screw cutting timing detection switch, 16… Feed chute,
17, 18 ... Nut fixing device, 19 ... Cleaning rod, 20, 21 ... Compressed air blowing nozzle, 22 ... Cleaning device for processed nut.

Claims (2)

[Scope of utility model registration request] 1. A tap 3 for threading provided vertically directly above a threading location 2 on a processing table 1, a chute 5 for supplying a nut material 4a onto the processing table 1, and a supplied nut material 4a.
First piston 6 that pushes back and forth to the threading place 2
And a reciprocating receiving rod 7 for receiving the extruded nut material 4a for threading, and a reciprocating second piston 8 for pushing the processed nut 4b in a direction perpendicular to the path of the first piston 6. In the above device, the threading place 2 is on the side of the path of the first piston 8,
The path of the receiving rod 7 is on the same straight line as the path of the first piston 6, and an elastic body 9 such as a spring, a backward stopper 10 and forward stoppers 11 and 12 are attached to the receiving rod 7 to press the first piston 6. The elastic body 9 is contracted by means of which the nut material 4a is transferred to the thread cutting location 2, and the elastic body 9 is expanded by releasing the pressing of the first piston to transfer the processed nut 4b to the path of the second piston 8. , Second
A pair of barrier ribs 13 and 14 for inserting a nut material are fixedly provided on opposite sides of the passage of the piston 8 with a threading place 2 interposed therebetween, and the barriers are pushed out by the first piston 6 and inserted between the barriers. The upper surface and the side surface of the nut material 4a are made of a bent plate that comes into contact with the clearance with a very small clearance so that the nut material 4a can be inserted.
Which is formed into a surface that can be intimately contacted with the surface of the nut material that abuts, and is extruded by the first piston 6
A thread threading device for a nut, comprising a thread threading timing detection switch 15 for activating the tap 3 when the thread 4a passes between the barriers 13 and 14 and reaches the threading place 2. 2. A nut fixing device 17, 18 for providing a processed nut feeding chute 16 in front of the path of the second piston 8 and for clamping the processed nut 4b pushed out by the second piston 8 on both sides of the chute. Are provided opposite each other,
A cleaning rod composed of a rod of a fluid pressure cylinder directly above the holding portion.
2. The nut thread cutting device according to claim 1, further comprising a cleaning device 22 for the processed nut, which is composed of 19 and compressed air blowing nozzles 20 and 21.