JPS6113930B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a cutting machine that cuts materials such as rods, tubes, or profiles with an appropriate cutter such as a circular saw blade, band saw blade, or hacksaw blade, and is capable of cutting the required cutting length of the material. Regarding the device for setting.

2. Description of the Related Art Conventionally, there is a device described in Japanese Utility Model Publication No. 52-14542, for example, as a device for setting the cutting length of a material in a cutting machine. In this system, a material feed table that reciprocates by being driven by a material feed cylinder installed on a pedestal is brought into contact with a stopper whose position is set in advance by a feed screw, and this is detected by a limit switch and stopped. However, in this device, the material feed table collides with the stopper at a considerable speed, and the impact of this collision transmits vibration to the entire device, which inevitably reduces accuracy and service life. Furthermore, if the axes of the position setting feed screw and the material feed cylinder are not in a straight line, a moment force acts upon stopping, resulting in further deterioration of stopping accuracy.

The present invention has been made in view of the above points, and
The purpose of this is to prevent the occurrence of impact when the material feed table stops, increase the stopping accuracy, and improve the setting accuracy of the cutting length of the material.

An embodiment of the present invention will be described below. In FIG. 1, a material feeding cylinder 2 and two guide rails 3a, 3b parallel to this are installed on a pedestal 1. A material feed table 4 is mounted thereon and is connected to the material feed cylinder 2 so as to be able to reciprocate along the same. The feed amount setting rod 5, which is arranged in parallel near one of the guide rails 3a, is supported on the pedestal 1 near both axial ends by guide members 6 and 7 so as to be rotatable in the circumferential direction and movable in the axial direction. ing.

Further, referring to FIG. 2, one end side of the feed amount setting rod 5 is formed with a small diameter shaft portion 8 and is slidably fitted into the hole 7a of the guide member 7. A compression spring 9 is fitted from the outside, and a pin 10
It is held in a slightly compressed state by an annular metal fitting 10 fixed by a to prevent it from coming off. A pin 11 is driven into the tip of the small diameter shaft portion 8 in the radial direction and protrudes, and a rotating handle 12 is provided at one end. mount 1
A connecting portion 14a with a large diameter is formed at the other end of the connecting shaft 14 supported above, and this connecting portion 14a is slidably fitted onto the small diameter shaft portion 8, and is fitted into the groove portion 14b.
are connected to each other non-rotatably and movably in the axial direction by engaging with the pin 11. Therefore, the feed rate setting rod 5 is biased toward the front end side, that is, to the right in the axial direction in FIG. By rotating the handle 12, the feed amount setting rod 5 is also rotated, and can be moved toward the rear end, that is, to the left in the axial direction, against the compression spring 9 by another external force. It's summery.
Note that reference numeral 15 is a counter for displaying a set value that operates according to the number of rotations of the connecting shaft 14.

Now, an adjustment bolt 16 is screwed into the rear end side of the feed amount setting rod 5, and the plunger 18 of a control valve 17 attached to the pedestal 1 comes into contact with the head of this adjustment bolt 16. ing.
Also, there is a feed screw 5 on the circumference of the feed amount setting rod 5.
The feed screw 5a is provided with a rotation regulating pin 19 that is approximately cylindrical and protrudes from its circumferential surface.
A is a stopper member 1 that is slidably fitted into a groove-shaped rail 20 provided on the pedestal 1 and is restricted from rotating.
9 are screwed together.

On the other hand, the material feed table 4 has a stopper member 19 larger than the outer diameter of the feed amount setting rod 5.
A bracket 21 having a through hole 21a smaller than the outer diameter of the bracket 21 is coaxially fitted onto the feed rate setting rod 5.
is attached, and when this bracket 21 comes into contact with the stopper member 19 as the material feed table 4 moves, the feed amount setting rod 5 moves to the left against the compression spring 9, and the control valve 17 is moved. The plunger 18 is pushed.

Now, to explain the control valve 17, as shown in FIG. 3, the control valve main body 22 is provided with a circular hole 23 in the center, and a spool 24 that is slidable in the circular hole 23 is tightly fitted. Covers 22a and 22b are attached to both ends of the control valve body 22, respectively, and pilot oil chambers 25 and 26 are formed between the covers and both end surfaces of the spool 24, and communicate with pilot ports 25a and 26a, respectively. A plunger 18 is attached to the right end of the spool 24, and this plunger 18 slidably penetrates the cover 22a and protrudes to the outside.An adjustment screw 22c is provided on the left cover 22b so that the left end of the spool 24 can be adjusted. The contact position can be adjusted.

Five annular grooves 27a, 27b, 27c, 27d, and 27e are provided at symmetrical positions on the circumferential surface of the inner round hole 23 of the control valve body 22, and are connected to the input port 28a, the output port 28b, 28c, or the tank port 28d, 28e, respectively. is connected to. The spool 24 has two land portions 24a, 24b corresponding to the positions of the grooves 27b, 27c communicating with the output ports 28b, 28c.
b is provided with a large number of tapered notches 29, 29, . . . from near the center toward both ends.

Therefore, when the spool 24 is in the center (the state shown in FIG. 3), the respective notches 29 of the land portions 24a, 24b communicate through the grooves 27b, 27c, and all the ports 28a, 28b, 28c ,28
d and 28e are in communication. When pilot pressure oil flows into the left pilot port 26a and the spool 24 moves to the right, the input port 28a and the output port 2 are communicated with each other by an amount corresponding to the amount of movement.
8b, and tank port 28e and output port 28
c communicate with each other. Conversely, when pilot pressure oil flows into the right pilot port 25a or the spool 24 moves to the left by pushing the plunger 18, the input port 28a and the output port communicate with each other by an amount corresponding to the amount of movement. 28c, and the tank port 28d and output port 28b communicate with each other.

Next, the material feed cylinder 2 is controlled by the control valve 17.
To explain the hydraulic circuit that controls the rod side chamber 2a of the material feed cylinder 2 in FIG.
The head side chamber 2b is connected to output ports 28b and 28c of the control valve 17, respectively. The tank ports 28d and 28e are connected to the oil tank 30, and the input port 28a is connected to the hydraulic pump 3 via a solenoid valve 31.
2 outputs, respectively. The pilot port 26a is connected to the flow rate adjustment valve 33, and the other pilot ports 25a are connected directly to the solenoid valve 3.
4, and is selectively connected to either the pressure oil source regulated by the relief valve 35 or the oil tank 30 by switching the solenoid valve 34.
Note that numerals 36 and 37 are both throttle valves.

According to this hydraulic circuit, when the solenoid valve 34 is OFF, pilot pressure acts on the pilot port 26a and the control valve 17 is switched, and when the solenoid valve 31 is ON, the rod side chamber 2a of the material feeding cylinder 2 is
Pressure oil is supplied to the cylinder, the cylinder contracts, and the material feed table 4 moves to the left. Next, when the plunger 18 is pushed strongly to the left, the control valve 17 is gradually switched.
The contraction speed of the material feed cylinder 2 decreases,
When the spool is located in the center (Figures 3 and 4)
In the state shown in the figure), the material feed cylinder 2 quietly stops. If the solenoid valve 31 is turned off in this state, the material feed cylinder 2 will remain in a stopped state.

Next, when the solenoid valve 34 is turned ON, pilot pressure acts on the pilot port 25a and the control valve 17 is switched, and when the solenoid valve 31 is ON, pressure oil is supplied to the head side chamber 2b of the material feed cylinder 2. The cylinder extends and the material feed table moves to the right. It should be noted that what pushes the plunger 18 of the control valve 17 is directly the feed amount setting rod 5, as can be understood from the previous explanation, but this is based on the contraction movement of the material feed cylinder 2. .
Therefore, the stop position of the contraction motion of the material feed cylinder 2 is determined by the position of the spool 24 of the control valve 17, and since the spool can usually be manufactured with high precision, the deceleration of the material feed cylinder 2 can be smoothly performed. In addition, the stopping accuracy can be significantly increased.

The signal for switching the solenoid valve 31 may be obtained, for example, from a limit switch that detects the position where the material feeder 4 stops at the left end, and the signal for switching the solenoid valve 34 may be obtained from the control panel. It can be generated from the changeover switch or as appropriate during automatic operation. Moreover, the relief valve 35 is
It is sufficient to adjust the oil pressure so that it is sufficient for the pilot use of the control valve 17 together with the throttle valve 37, and that it can also be switched by the plunger 18. Furthermore, the maximum flow rate of the control valve 17 is determined by the amount of movement of the spool.
The right end of the spool 18 is adjusted by the adjustment bolt of the feed rate setting rod 5 described above, and the left end of the spool 18 is adjusted by the adjustment screw 22c.
The speed can be adjusted.

In Fig. 1, a fixed clamp vise 4a, a movable clamp vise 4b, and a clamping cylinder 4c are mounted on the material feed table 4, and a fixed clamp vise 1b, a movable clamp are mounted on the main body frame 1a to which the pedestal 1 is attached. A vise 1c and a clamp cylinder 1d are each equipped.
Further, reference numeral 1e indicates a saw blade.

The cutting length setting device configured as described above rotates the handle 12, moves the stopper member 19, and sets the stopper member 19 to a desired position in advance by looking at the counter 15. When the material feed cylinder 2 is at the extended end, that is, the material feed table 4 is at the right end, the solenoid valve 31 is activated.
When the material feed table 4 is turned on and the material feed table 4 moves to the left, the bracket 21 comes into contact with the stopper member 19 near the setting position, moves the feed amount setting rod 5 to the left against the compression spring 9, and the control valve Since the spool 24 of No. 17 is moved to the left, the amount of oil supplied to the material feed cylinder 2 is gradually reduced, the speed is reduced, and the material feed cylinder 2 is stopped at a certain position. In this state, when the material A is clamped with the clamp vises 4a and 4b and the solenoid valve 34 is switched, the material feed table 4 moves to the right together with the material A, and the material feed cylinder 2
It stops at the end of extension. The feed amount of the material A at this time is the distance from the above-mentioned stop position to the extended end of the material feed cylinder 2, so it can be arbitrarily selected by setting the position of the stopper member 19 by rotating the handle 12. can. In addition, the material feed table 4 is gradually decelerated and then the material feed cylinder 2 itself stops smoothly, which prevents the occurrence of impact when stopping, making it possible to set an arbitrary cutting length, and to make highly accurate settings. I can do it.

In this embodiment, the bracket 21 is in contact with the stopper member 19, but the material feed table 4 may be in direct contact with the stopper member 19, or an engagement dog may be provided on the piston rod of the material feed cylinder 2. You can also use it as

As described above, according to the present invention, by rotating the connecting shaft and adjusting the movement of the stopper member to an appropriate position, the material feed table can be accurately stopped at the rear end side, and any cutting length can be set. can be set accurately. In particular, the feed rate setting rod is movable in the axial direction and is biased by an elastic member, and when the material feed table moves toward the rear end, it comes into contact with the stopper member and the control valve is activated via the feed rate setting rod. Since the spool is moved and the material feed cylinder is hydraulically controlled to decelerate and stop, no collision occurs when the material feed table stops, and no impact occurs. Therefore, the stopping accuracy is high,
It is possible to improve the accuracy of setting the cutting length of the material. Further, since the material feeding cylinder is hydraulically controlled by the control valve, it is reliably stopped by the operation of the control valve, and runaway due to failure of electrical wiring or the like can be prevented. Moreover, since the control valve is installed on the frame like the material feed cylinder, the piping can be fixed, saving labor, cost, and space for piping, and making maintenance and inspection easy. This makes it possible to prevent a decrease in the stopping accuracy of the material feed cylinder.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, in which Fig. 1 is a plan view of the cutting length setting device, Fig. 2 is a partially sectional plan view of the main part, Fig. 3 is a sectional view of the control valve, and Fig. 4 is a plan view of the cutting length setting device. FIG. 3 is a hydraulic circuit diagram showing a control circuit. 1... Frame, 2... Material feeding cylinder, 4...
Material feed table, 5... Feed amount setting rod, 5a...
...Feed screw, 6, 7...Guide member, 9...Compression spring (elastic member), 14...Connection shaft, 17...Control valve (sensor), 19...Stopper member, 24
……spool.

Claims (1)

[Claims] 1. A cutting machine having a material feed table 4 that reciprocates by being driven by a material feed cylinder 2 installed on a pedestal 1, in which a feed screw 5a is provided on the circumferential surface of the material feed table 4, which is arranged parallel to the moving direction of the material feed table 4. The feed amount setting rod 5 is supported so as to be rotatable in the circumferential direction and movable in the axial direction by guide members 6 and 7 provided on the frame 1, and is normally biased toward the front end side in the axial direction by being biased by an elastic member 9. On the other hand, the connecting shaft 14, which is connected to the feed amount setting rod 5 so as to be mutually unrotatable but movable in the axial direction, and the movement of the feed amount setting rod 5 toward the rear end in the axial direction, The control valve 17, which has a spool 24 that moves along with the mount, is screwed into the feed screw 5a and is regulated so as not to rotate with respect to the mount 1, and when the material feed table 4 moves toward the rear end side. bracket 21
The material feeding cylinder 2 is provided with a stopper member 19 that can be brought into contact with the spool 2 by moving the feed amount setting rod 5 toward the rear end side.
4. A cutting length setting device for a material in a cutting machine, characterized in that the device is hydraulically controlled so as to decelerate and stop according to the movement of the cutting machine.