JPH09277136A - Rod material transfer amount detection device for rod material feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To machine a rod material only upon being fed by length equal to the preset proper travel distance by providing an alarm means for performing an alarm process about a transfer amount shortage, when a travel distance detected with a travel distance detection means is short of the preset proper travel distance. SOLUTION: A push rod 12 begins to advance, when a chuck open signal is sent from a working machine. In this case, judgement is made as to whether the travel distance (d) of the push rod 12 as the count value of a rotary encoder is over a travel distance d2 or the effective machining length of a rod material 14. When the count value is equal to or above the preset value, an alarm is outputted, regarding an excess over a feed amount. Consequently, measures are taken, including the emergency stop of a feed motor 5, the separation of a cutter 18 from the rod material 14 and the generation of an alarm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar material feed amount detecting device for a bar material feeder which automatically supplies a bar material to a bar processing machine such as a lathe.

[0002]

2. Description of the Related Art In a bar feeder, a gripper at the tip of a push rod attached to a feed chain extending in the conveying direction of the bar grips the rear end of the bar, and the feed chain is driven by a feed motor. Thus, the bar material is continuously fed to the bar material processing machine arranged on the extension line thereof.

When the bar is fed by the bar feeder, the moving distance of the push rod becomes smaller than the proper moving distance due to some reason, or the stopper (see FIG. 2) comes off, so that it is shorter than the proper moving distance. When it becomes large, the bar is fed only a length shorter than the proper length or longer than the proper length. In such a case, the product will be defective even if it is processed by a processing machine such as a lathe.

In order to avoid such inconvenience, conventionally,
The counter measures the movement distance d of the push rod from the start of movement, and outputs a signal with a preset value of the movement distance d ₁ (see FIG. 2) shorter than the proper movement distance D (see FIG. 2). The timer is set to operate after the time required for the push rod to move beyond the preset value has passed, and it is attempted to judge that there is a feed error if the timer operates before the counter outputs the signal according to the preset value. Has been. In addition, the movement distance d of the push rod is counted from the start of movement of the push rod by the counter, and a signal is output with a preset value of the movement distance d ₂ (see FIG. 2) longer than the proper movement distance D. Attempts have been made to judge that the feeding is abnormal by counting the preset value.

[0005]

[SUMMARY OF THE INVENTION However, according to the means for detecting the above-described conventional feed abnormal, it is determined that "normal" be in the range of (D-d ₁₎ or (d ₂ -D) If the bar for chips or the like is attached to the stopper of the lathe does not strike completely the stopper, even in such a case the feed of the bar has stopped in the range of (D-d ₁₎ or (d ₂ -D) processing Will be implemented. Although this processed product is a defective product, when it is mixed in a non-defective product, it is difficult to discriminate it visually, and as a result, it is necessary to spend a lot of labor such as re-inspection of all products.

Further, since the moving distance d of the push rod is conventionally detected by arranging a rotary encoder with respect to the sprocket wheel of the feed chain of the push rod and rotating the rotary encoder, the tip of the rod is a lathe stopper. If the sprocket wheel winds up by the amount of slack in the feed chain when it hits, the moving distance of the bar ≠ the measured value of the rotary encoder, which may make proper machining difficult.

Therefore, it is an object of the present invention to provide means capable of solving such a problem.

[0008]

In order to achieve the above-mentioned object, the invention according to claim 1 uses the driving force of a driving device to drive the rod 1
4, a push rod 12 that conveys 4 in the longitudinal direction, a moving distance detecting unit that detects a moving distance d of the push rod 12, and a proper moving distance in which the moving distance d detected by the moving distance detecting unit is preset. The invention according to claim 2 is characterized in that a bar material conveying amount detecting device of a bar material supplying machine is provided with an alarm means for performing an alarm process for a conveyance amount shortage when D does not reach. The push rod 12 that conveys the rod 14 in its longitudinal direction, and the moving distance d of the push rod 12
And a proper moving distance D in which the moving distance d detected by the moving distance detecting means is preset after a lapse of a predetermined time from the start of conveyance of the push rod 12.
When the push rod 12 does not move forward and backward, the rod material feed amount detecting device of the rod material feeder is provided. The moving distance detecting means employs the configuration of the rod material conveying amount detecting device of the rod material feeder according to claim 1 or 2 which is driven by the push rod 12.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 As shown in FIG. 1, this bar material feeder 2 is adjacent to a bar material processing machine 1 such as a lathe, and an operation panel 3 for performing various operations and a bar material feeder as a whole. A control box 4 for controlling is provided.

As shown in FIGS. 2 and 3, the bar processing machine 1 has a stopper 16 for receiving and positioning the tip of the bar 14 supplied from the bar feeder 2, and the bar 16.
It is provided with a chuck 19 of a main shaft for holding 4 and a blade 18.

The body of the bar feeder 2 extends horizontally toward the bar processing machine 1, and a mechanism as shown in FIGS. 2 and 3 is provided inside the main body. That is, the push rod 12 of the rod 14 is reciprocally arranged on the extension line of the chuck 19 of the main shaft of the rod processing machine 1, and the feed chain 11 for driving the push rod 12 is arranged endlessly. ing. The push rod 12 has a gripper 13 that detachably holds the rear end of the rod 14 at the tip thereof, and has a connecting portion with the feed chain 11 at the rear end. In this case, the push rod 12 is specifically a feed pipe, and the gripper 13 is specifically a finger chuck.
The feed chain 11 is stretched between sprocket wheels 9 and 10 that are axially supported in the front and rear of the main body, and is powered by a feed motor 5 arranged at the rear of the main body via pulleys 6, 7 and a belt 8. It is being transmitted.

Further, as shown in FIGS. 2 and 3, the rod feed amount detecting device in the rod feeder 2 is a push rod for feeding the rod 14 in its longitudinal direction by the driving force of the driving device. 12, the moving distance detecting means for detecting the moving distance d of the push rod 12, and the moving distance d detected by the moving distance detecting means 20 does not reach the preset proper moving distance D, the conveyance amount is insufficient. And alarm means for performing alarm processing.

The drive unit is composed of the feed motor 5, the feed chain 11, the pulleys 6 and 7, the belt 8 and the like, and is for moving the push rod 12 back and forth.

As shown in FIG. 3, the moving distance detecting means mainly comprises a rotary encoder 20 connected to the shaft of the sprocket wheel 9, and a pulse signal from the rotary encoder 20 is inputted to the input device. 21
Via a microcomputer (hereinafter referred to as CPU)
It is designed to be processed at 22. The rotary encoder 20 is adapted to output a predetermined number of pulse signals according to the amount of displacement of the rotational angle of the pulley 7. This pulse signal is, for example, 2000 pulses / revolution. The rotational angle displacement amount of the pulley 7 indicated by this pulse signal is
They are equal to the linear displacement of the feed chain 11, the moving distance d of the push rod, and the linear displacement of the bar 14, respectively.

The CPU 22 is the rotary encoder 2
It has a function as a calculation unit that counts the output pulse signal of 0 to calculate the transport amount of the bar material 14 (hereinafter, this function is referred to as a “counter”). CPU 22
The storage unit stores a proper moving distance D as shown in FIG. 2, that is, a bar length set during processing. CPU
22 includes a predetermined display device 34 and an input keyboard 35.

The alarm means outputs the processing signal output from the CPU 22 to the outside through the output device 23, and stops the feed motor 5, separates the blade 18 from the bar 14, and issues an alarm. It is designed to let you.

The input device 21, the CPU 22 and the output device 23 are housed in the control box 4,
The display device 34 and the input keyboard 35 are arranged on the operation panel 3.

Next, a more specific configuration of the bar material conveying amount detecting device of the bar material feeder will be described with reference to FIGS. 2, 3 and 9 together with an alarm processing procedure in the CPU 22.

As shown in FIG. 2, the proper moving distance D is the distance from the blade 18 to the stopper 16, and is equal to the width a of the blade 18 to be cut to determine the product length and the product processing length b.

First, the operator sets the proper moving distance D of the push rod 12, that is, the bar set length at the time of processing, and the set values of the moving distance d ₂ longer than the proper moving distance D from the operation panel 3. (Step 101). Next, when a chuck open signal is input from the processing machine side (step 102, YE
S), the push rod 12 starts to move forward (step 10).
3).

At this time, the moving distance d of the push rod 12, which is the count value of the rotary encoder 20, is changed to the moving distance d.
₂ That is, it is determined whether or not the effective processing length of the bar 14 has been exceeded (step 104). If the count value is equal to or greater than the set value (step 104, YES), an alarm indicating that the delivery amount has exceeded is output (step 104). Step 105). As a result, measures such as an emergency stop of the feed motor 5, a separation of the blade 18 from the bar 14, and an alarm are taken.

On the other hand, when the count value does not reach the set value (step 104, NO), the CPU 22 determines whether or not the sending completion signal is output (step 106). The delivery completion signal is supplied from the bar material feeder 2 to the bar material processing machine 1 2 to 3 seconds after the chuck open signal is input. When the transmission completion signal is output (step 106, YE
In S), it is determined whether the chuck open signal is off (step 107).

When it is determined that the chuck open signal is off (step 107, YES), the CPU 22 determines whether the moving distance d of the push rod 12 has reached the proper moving distance D (step 108), If it is determined that the amount has not been reached (step 108, YES), an alarm of insufficient delivery amount is output (step 109). This allows
The same warnings and other measures as above will be taken. Insufficient output
This occurs when the rod is not delivered, or when chips or the like adhere to the stopper 16.

A transmission completion signal is output (step 10
6, YES), when the chuck open signal is turned off (step 107, YES), the counter is reset and set (steps 110, 111), and the feed output by the push rod 12 is turned off (step 112). The material 14 is processed (step 113). After the product processing is completed (step 114), the above steps 102 to 113 are performed.
Is repeated.

After the proper moving distance D is detected in step 108, the counter is reset (step 110) when the material feeding force by the push rod 12 is applied, and the counter is immediately set (step 111). When the material feeding force is released (step 112), even if the push rod 12 retreats due to its reaction, it is possible to measure only the amount of retreat. For example, the reset position can be set to 0, and the retracted distance can be measured as a negative amount. Also,
The moving distance of the push rod 12 during processing can be similarly displayed.

With such a structure, it is possible to prevent the product processing having a dimensional defect from occurring, and to prevent the blade 18 from being damaged. Embodiment 2 The rod material conveyance amount detecting device of the rod material feeder 2 is substantially the same as that in the above-mentioned Embodiment 1, and as shown in FIGS. 2 and 3, the rod material 14 is driven by the driving force of the driving device. Is provided with a push rod 12 for conveying the push rod 12 in its longitudinal direction and a moving distance detecting means for detecting a moving distance d of the push rod 12. The difference is that the pushing rod 12 is provided with inching means for performing forward and backward inching operations when the moving distance d detected by the means is smaller than a preset proper moving distance D.

The inching means is adapted to cause the feed motor 5 to make small forward and reverse rotations via the output device 23 in response to the output signal of the CPU 22 so that the push rod 12 is moved forward and backward.

A more specific structure of the bar material conveying amount detecting device of the bar material feeder 2 will be described with reference to FIGS. 2, 3 and 10 together with the processing procedure in the CPU 22 thereof.
First, the operator sets an appropriate movement distance D of the push rod 12, that is, a bar material set length during processing, and a movement distance d ₂ longer than the appropriate movement distance D from the operation panel 3 (step 201). Next, when a chuck open signal is input from the processing machine 1 (step 202, YES), the push rod 12 starts moving forward (step 203).

At this time, the moving distance d of the push rod 12, which is the count value of the rotary encoder 20, is changed to the moving distance d.
₂ That is, it is determined whether or not the effective working length of the bar 14 has been exceeded (step 204). If the count value is equal to or greater than the set value (step 204, YES), an alarm indicating that the delivery amount has exceeded is output (step 205). As a result, measures such as an emergency stop of the feed motor 5, a separation of the blade 18 from the bar 14, and an alarm are taken.

On the other hand, when the count value does not reach the set value (step 204, NO), the CPU 22 determines whether the sending is completed (step 206). Whether or not the delivery is completed is determined in the CPU 22 by a timer up time 2 to 3 seconds after the input of the chuck open signal. When the sending is completed (step 206, YES), it is judged whether or not the inching (inching) time control timer has timed up (step 207), and when the time is up (step 207, YES), the sending time over alarm is issued. Is output (step 208). As a result, the stop operation of the feed motor 5 and the like are performed as described above.

If the inching time control timer has not timed out (step 207, NO), it is judged whether or not the moving distance d of the push rod 12 has reached the proper moving distance D (step 209), and it has reached. When it is determined that there is not any (step 209, NO), the push rod 12 is operated by inching. That is, first, the forward movement of the push rod 12 is stopped (step 210), then the backward movement is inched (step 211), and then stopped (step 21).
2), move forward (step 203). This inching operation is repeated within the set time of the inching time control timer until the moving distance d of the push rod 12 reaches the proper moving distance D.

The moving distance d of the push rod 12 is the proper moving distance D.
If it reaches (YES at step 209), a transmission completion signal is output (step 213). The delivery completion signal is supplied from the bar material feeder 2 to the bar material processing machine 1. When the transmission completion signal is output (step 213, YE
In S), it is determined whether or not the chuck open signal is off (step 214). When it is determined that the chuck open signal is off (step 214, YES), the counter is released before the material feeding force is released. Are reset and set (steps 215 and 216). Thereafter, the power output by the push rod 12 is turned off (step 217), and the rod material 14 is processed (step 218). When the product processing is completed (step 219), the above steps 202 to 219 are repeated.

In any of the first and second embodiments described above, the push rod 12 can be driven by means other than the feed chain 11. For example, the feed rod drives the push rod 12 and rotates the lead screw. The encoder 20 may be attached to the.

Third Embodiment As shown in FIG. 4, this bar stock feeder has a base 36 horizontally arranged in its main body, and is also horizontally supported on the base 36. It has a push rod guide rail 37. A push rod 1 is provided on the push rod guide rail 37.
2 is held via front and rear push rod sliders 38 and 39. The push rod sliders 38 and 39 are driven by the endless feed chain 11, and the feed chain 11 is sprocket wheels 10 and 9 axially supported at the front and rear of the push rod guide rail 37, respectively.
Has been passed over. The feed chain 11 is the base 3 described above.
6 is driven by transmission of power from a feed motor 5 arranged on 6 to a sprocket wheel 9 on the rear side via pulleys 6, 7 and a belt 8.

The moving distance detecting means in the bar material conveying amount detecting device of the bar material feeder is driven by the push bar 12. Specifically, as shown in FIGS. 4 to 8, the endless body 40 made of a wire or cable that is difficult to expand or contract is a rear push bar slider 39.
And a guide pulley 43 pivotally supported on brackets 41, 42 at the front and rear ends of the push rod guide rail 37.
It is bridged between a, 43b, 43c and 43d. In this case, only the guide pulleys 43b and 43c may be provided and the other guide pulleys 43a and 43d may be omitted, or four or more guide pulleys may be provided. In addition, the base 36
Rotary encoder 2 via bracket 44 above
0 is attached to the rotary encoder 2
The endless body 40 is hung on an encoder pulley 45 fixed to the shaft end of 0. Therefore, when the push rod 12 moves in the front-rear direction on the push rod guide rail 37 by driving the feed chain 11, the endless body 40 also moves along with the guide pulleys 43a, 43b, 43 as the push rod 12 moves.
The rotary encoder 20 is driven while traveling while being guided by c and 43d.

A tension pulley 46 for eliminating the slack of the endless body 40 and winding the endless body 40 around the encoder pulley 45 at a constant winding angle is arranged near the encoder pulley 45. That is, the tension pulley 46 is adapted to pull the endless body 40 rearward behind the encoder pulley 45, and is axially supported on the tension pulley slider 47. The tension pulley slider 47 is a tension pulley guide. The tension pulley guide rail 48 is slidably supported on a rail 48, and is fixed to the bracket 44 on the base 36 in a cantilever manner. A gas spring 49 is interposed between the tension pulley slider 47 and the bracket 44. The tension pulley 46 constantly applies tension to the traveling body by the urging force of the gas spring 49. Gas spring 49
Seals the gas in the cylinder 49a,
The piston rod 49b is biased in one direction by the difference in gas pressure applied to both sides of the piston in 9a. Of course, a normal coil spring may be used instead of the gas spring 49. Further, the positions of the encoder pulley 45 and the tension pulley 46 may be exchanged, and the gas spring 49 may be set in the direction opposite to that shown in FIG.

When the push rod 12 is moved forward by driving the feed chain 11, the endless body 40 travels as the push rod 12 advances, and the rotary encoder 20 detects the moving distance d of the push rod 12. Become. Since the rotary encoder 20 is driven by the push rod 12 as described above, the moving distance d of the push rod 12 can be accurately detected.

The other construction of the bar feed amount detecting device in the bar feeder 2 is the same as that of the first or second embodiment, and the signal from the rotary encoder 20 driven by the push rod 12 is an input device. 21 (see FIG. 3)
Will be entered in.

The push rod 12 can be driven by means other than the feed chain 11, for example, by a lead screw.

[0040]

According to the first aspect of the present invention, when the proper moving distance of the push rod is set in advance and the moving distance detected by the moving distance detecting means does not reach the proper moving distance, the alarm processing for the shortage of the carry amount is performed. Therefore, the bar material can be processed only when the bar material is fed by the length equal to the appropriate moving distance, and therefore it is possible to prevent inconvenience such as mixing defective products with good products.

According to the second aspect of the present invention, for example, when the chuck of the spindle is poorly opened and the feed of the rod is insufficient, or when the feed of the rod due to chips adhering to the inside of the spindle is insufficient. Even if the push bar is caught on the feed chain, guide rail, etc., the feed of the bar can be corrected by inching before the alarm processing, so try not to stop the bar feeder as much as possible. The operating rate can be improved.

According to the third aspect of the present invention, since the moving distance detecting means is driven by the push rod, when the cutting material or the like adheres to the stopper of the lathe and the rod does not completely hit the stopper, the push rod is driven. Even when the feed chain is loosened, it is possible to accurately detect the moving distance of the push rod and perform proper processing.

[Brief description of drawings]

FIG. 1 is a front view showing an outline of a bar material feeder and a bar material processing machine.

FIG. 2 is a schematic view of a mechanism of a bar material feeding device.

FIG. 3 is a block diagram of a rod material conveyance amount detection device.

FIG. 4 is a front view showing another embodiment of the bar feeder.

FIG. 5 is a partially cutaway front view in the vicinity of a tension pulley of the bar feeder.

FIG. 6 is a partially cutaway plan view in the vicinity of a tension pulley of the bar feeder.

7 is a sectional view taken along line VII-VII in FIG.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a flowchart showing a processing procedure of the rod material conveyance amount detection device.

FIG. 10 is a flowchart showing another processing procedure of the rod material conveyance amount detection device.

[Explanation of symbols]

 12 ... Push bar 14 ... Bar material d ... Moving distance D ... Proper moving distance

Claims (3)

[Claims] 1. A push rod that conveys a rod in the longitudinal direction thereof by a driving force of a drive device, a moving distance detecting unit that detects a moving distance of the pushing rod, and a moving distance detected by the moving distance detecting unit. And an alarm means for performing alarm processing for an insufficient conveyance amount when the predetermined movement distance has not been reached. 2. A push rod which conveys a rod material in its longitudinal direction by a driving force of a drive device, a moving distance detecting means which detects a moving distance of the push rod, and a predetermined time after the start of the conveyance of the push rod. A rod having inching means for causing the push rod to perform forward and backward inching operations when the movement distance detected by the movement distance detection means does not reach a preset proper movement distance. A bar feed amount detection device for a material feeder. 3. A bar material conveying amount detecting device for a bar material feeder according to claim 1, wherein the moving distance detecting means is driven by the push bar.