JPH06262402A - Automatic bar feeding machine - Google Patents

Abstract

PURPOSE:To provide an automatic bar feeding machine which can reduce the work interruption time of a bar working machine which occurs during the retreating operation of a bar feeding member and the charging operation of a new material, and which can improve the production efficiency of products. CONSTITUTION:A bar feeding machine 1 is provided with a first bar feeding unit 10L and a second bar feeding unit 10R, and these bar feeding units are alternately moved on the working center axis X-X, and are alternately aligned with the spindle shaft of an NC lathe. While one bar feeding unit feeds a bar W for the main spindle, the other bar feeding unit executes the discharging operation of the residual material and the charging operation of a new material into a guide pipe G, and when the former bar feeding unit completes the feeding of the bar, the latter bar feeding unit waits for the feeding of the bar in an immediately executable manner. Each bar feeding unit is provided with a material loading shelf 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic bar feeder, and more particularly to a material holding means for holding a plurality of bars and a bar guiding means extending in the feeding direction of the bars. A bar replenishing device for replenishing the bar from the material holding means to the guide, and a bar feed for moving the bar of the guide member to the bar processing machine by moving along the guide member. And an automatic bar feeder having a member.

[0002]

2. Description of the Related Art An automatic bar material feeder configured to automatically supply a bar material to a bar processing machine such as an NC lathe has been widely put into practical use. Such an automatic bar feeder generally drives a material rack on which a plurality of bar members are placed, a bar material feeding member that presses the rear end of the bar material to be processed toward the bar material processing machine, and a bar material feeding member. And a drive device for controlling the operation of these mechanisms.

A bar feeder of this type is known which is provided with a guide means for guiding the bar and the bar feed member along the machining center axis of the bar machining machine. The guide means is generally configured as a guide pipe or guide rail with a groove, channel or hollow for receiving a rod and a rod feed member, for example a feed or push arrow, the guide pipe or guide rail being a rod. It is fixed on the frame of the bar feeding machine along the processing axis of the material processing machine (for example, Japanese Patent Laid-Open No. 2-95501).

Further, in this type of guide means, there has been proposed one in which an openable and closable shutter is provided on the upper part of the guide rail in order to prevent the bar material from jumping out of the groove. 4-65812).

[0005]

However, in these bar material feeders, when the bar material processing machine completes the processing of one bar material, the feed arrow or push arrow is retracted, and the guide rails or It is configured to feed a bar (new material) into the guide pipe, and then feed the new material to the bar processing machine. During the backward movement of the feeding member and the feeding operation of the new material, Bar processing machines have no choice but to interrupt cutting or turning operations.

Further, in the bar material feeder configured to carry back and discharge the residual material left on the collet chuck of the NC lathe to the bar material feeder, the residual material discharging operation in the bar material feeder. The time associated with the operation further extends the work interruption time of the NC lathe. The present invention has been made in view of the above points, and an object thereof is to reduce the work interruption time of the bar processing machine that occurs during the retreating operation of the bar feeding member and the charging operation of the new material, An object is to provide an automatic bar feeder that can improve product production efficiency.

[0007]

In order to achieve the above-mentioned object, the present invention has a material holding means for holding a plurality of rods, and a guide for the rods extending in the feeding direction of the rods. A rod replenishing device for replenishing the rod from the material holding means to the guide, and a rod feeding member that moves along the guide and feeds the rod of the guide to the rod processing machine. In the automatic bar feeder, the guide means includes first and second guide members arranged laterally with a space, and the bar feed member includes first and second guide members. Support means for supporting the first and second guide members so as to be displaceable laterally in the feeding direction, and first and second bar material feeding members respectively arranged in A drive unit for the guide member that moves the guide member laterally, and an operation control unit that controls the operation of the drive unit. To provide an automatic bar feeder, characterized in that the device and is provided.

According to the above configuration of the present invention, the first and second
By moving the guide member left and right by the drive device, one of the first guide member and the second guide member is moved to a position aligned with the bar processing machine, and the other of the first guide member and the second guide member is moved. , Can be evacuated to the side. Therefore, while the bar material is fed to the bar material processing machine using the one guide member, the retreating operation of the bar material feeding member and the feeding operation of the new material can be executed in the other guide member. Therefore, according to the bar material feeder having the above-mentioned configuration, the work interruption time of the bar material processing machine which occurs during the backward movement operation of the bar material feeding member and the feeding operation of the new material can be shortened.

According to a preferred embodiment of the present invention, a first material holding means and a first bar replenishing device are provided adjacent to the first guide member, and a first material holding device and a first bar replenishing device are provided adjacent to the second guide member. Two material holding means and a second bar material replenishing device are provided, and the first guide member, the first material holding means and the first bar material replenishing device are moved laterally on the supporting means by the driving device. The second guide member, the second material holding means, and the second bar material replenishing device that are laterally moved on the supporting means by the driving device. It constitutes a bar material feeding unit.

According to such a structure, the bar material feeder is provided with at least two bar material feeding units including the guide member, the material holding means and the bar material replenishing device. Therefore, the amount of new material held increases, and it is possible to greatly reduce the number of times new material is replenished to the material holding means such as the material shelf. In a preferred embodiment of the present invention, a finger chuck is provided at the front end of the bar feed member for holding the rear end of the bar and bringing back the residual material of the bar processing machine to the bar feeder. . In such a bar feeder, not only the work interruption time of the bar processing machine due to the backward movement of the bar feeding member and the feeding operation of the new material, but also the work interruption time of the bar processing machine due to the discharge operation of the remaining material Can be further shortened.

Preferably, the operation control device includes a residual material detection sensor and a material detection sensor arranged at the front end portion of the guide means, and the residual material detection sensor holds the residual material by the rod material feeding member. The presence or absence of the return is detected, and the material detection sensor detects the protrusion of the bar or the residual material from the front end of the guide means. When the bar material feeding member retracts while leaving the residual material on the collet chuck of the NC lathe and the like, it may cause troubles when the new material is continuously fed. The take-back failure can be detected by the residual material detection sensor. Further, when the lateral movement of the guide member is executed in a state where the residual material or the bar material is projected from the front end of the guide member, the projecting portion may hinder the smooth lateral movement. In this case, since such an abnormal state can be detected by the material detection sensor, this can be prevented in advance.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing the embodiments of the present invention, a schematic structure and an operation mode of a conventional automatic bar feeder will be briefly described. 6 to 8 are schematic plan views showing the operation of the conventional automatic bar feeder. As shown in FIG. 6, the automatic bar feeder 100 (hereinafter referred to as the bar feeder 100) is a bar W.
Main frame 101 extending in the feeding direction of the main frame 1 and the main frame 1
01, and a guide pipe G integrally fixed on the upper part of the No. 01. The guide pipe G is aligned with the machining center axis line XX of the spindle 90 of the NC lathe. The bar material feeder 100 further includes a material shelf 102 on which a plurality of bar materials (new materials) W are placed.
And a feed arrow F guided by the guide pipe G in the feeding direction, and a feed arrow drive device (not shown) for moving the feed arrow F forward or backward.

In FIG. 6, the feed arrow F is substantially advanced to the foremost end position. The finger chuck f provided at the front end of the feed arrow F is connected to the spindle 92 of the main shaft 90.
The residual material RW that is inserted into the inside and is to be discarded is gripped by the collet chuck 91 of the main shaft 90. The collet chuck 91 is opened, and the feed arrow F is retracted while the remaining material RW is carried by the finger chuck f as shown in FIG.

Then, the residual material discharging mechanism (not shown) removes the residual material RW from the finger chuck f and discards the residual material RW. Thereafter, as shown in FIG. 8, the feed arrow F is further retracted, and the bar material (new material) W on the material shelf 102 is moved.
Is thrown into the guide pipe G in front of the feed arrow F.
Subsequently, the feed arrow F is advanced and the finger chuck f
Grips the rear end portion of the bar material (new material) W in the guide pipe G, and thus the bar material feeder 100 is in a state where it can start feeding the bar material W.

However, in such a conventional bar feeder 100, the NC lathe processes the product for a relatively long period of time until the feeding of the new material W is started after the feed arrow F starts to move backward. You have to stop and wait. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 is a vertical cross-sectional view showing an automatic bar material feeder according to an embodiment of the present invention, and FIG. 2 is a schematic overall plan view of the automatic bar material feeder shown in FIG.

As shown in FIG. 1, an automatic bar material feeder 1 (hereinafter referred to as a bar material feeder 1) includes front and rear stands 2 (only one of which is shown) which is vertically expandable and contractible.
A front and rear horizontal frame 3 (only the front frame 3 is shown) that is supported by each stand 2 and extends in a direction orthogonal to the feeding direction of the bar W, and is fixed to the upper surface of the frame 3 3 and a guide rail 4 extending in parallel. On the guide rail 4, each slide block 11 of the pair of bar material feeding units 10 and 10 is slidably supported along the guide rail 4.

The bar material feeding units 10 and 10 are supported by the guide rail 4 via slide blocks 11 and 11. Each bar material feeding unit 10 is supported on the upper surface of the main frame 12 via a horizontal main frame 12 extending in the feeding direction of the bar material W, a base portion 13 fixed to the upper surface of the main frame 12, and a base portion 13. The guide pipe G and the material shelf 15 arranged on the side of the guide pipe G are provided. The guide pipe G constitutes a guide means, and the material shelf 15 constitutes a material holding means. Further, the guide rail 4 constitutes a support means for supporting the guide means.

The bar material guide path 16 of the material shelf 15 is inclined downward toward the guide pipe G, and the bar material guide path 16 is provided.
A plurality of rods W are placed on. The lower end of the rod guide path 16 located on the guide pipe G side faces the holding groove 18 of the material indexing plate 17 that constitutes the rod replenishing device.
A bar material (new material) W to be supplied to the guide pipe G is housed in the holding groove 18. The material indexing plate 17 is configured to rotate at a predetermined angle and in a direction indicated by an arrow when replenishing the bar material (new material) W, and cooperates with the arc-shaped guide surface 19 of the material shelf 15. The bar W is moved to above the guide pipe G, and the bar W is put into the guide pipe G.

The pair of bar material feeding units 10 has a bilaterally symmetrical structure, and the main frames 12 and 12 are integrally connected by a connecting member 20. An upper end portion of a power transmission member 21 is connected to a left side portion of a rod feeding unit 10 (hereinafter referred to as a first rod feeding unit 10L) shown on the left side in FIG. The lower end of the power transmission member 21 is fixed to the piston rod 31 of the fluid pressure actuated cylinder device 30 that constitutes the drive device, and extends upward from the tip of the piston rod 31. Cylinder device 3
0 is supported by the horizontal frame 3 and is oriented parallel to the horizontal frame 3. Supply / discharge port 3 of cylinder device 30
2, 33 are connected to a working fluid source, for example, a working air source (not shown) via a fluid control circuit (not shown).

The right side portion of the bar material feeding unit 10 shown on the right side in FIG. 1 (hereinafter referred to as the second bar material feeding unit 10R) is in contact with the stopper 22. Stopper 22
In this example, is a bolt having a head portion that comes into contact with the side surface of the main frame 12, and is attached to a vertical support member 23 so that the amount of protrusion can be adjusted. Support member 2
The lower end portion of 3 is fixed to one end of the horizontal frame 3. A similar support member 23 is also provided at the other end of the horizontal frame 3.
Is fixed, and a similar stopper 22 is attached to the upper end portion of the support member 23 so that the protrusion amount can be adjusted.

In FIG. 1, the second bar material feeding unit 1 on the right side
0R is moved to the right of the bar feeder 1, and further rightward movement is restricted by the stopper 22 on the right side. On the other hand, the first rod material feeding unit 10L on the left side is located at the center of the rod material feeder 1, and the guide pipe G of the first rod material feeding unit 10L is connected to the main shaft 90 (FIG. 2) of the NC lathe. Are aligned. When the cylinder device 30 extends the piston rod 31, the first rod feeding unit 10L moves to the guide rail 4
1 is moved to the left in FIG. 1 and comes into contact with the head portion of the left stopper 22 as shown by an imaginary line to prevent further movement to the left. At this time, the second rod feeding unit 10R is located at the center of the rod feeding machine 1, and the guide pipe G of the first rod feeding unit 10L is aligned with the main shaft 90 (FIG. 2) of the NC lathe. To do.

In the guide pipe G, a bar material feeding member for pressing the bar material W in the guide pipe G toward the main shaft 90 of the NC lathe, that is, a feed arrow F is movable in the axial direction of the guide pipe G. Is located in. At the front end of the feeding arrow F, N
A finger chuck that holds the rear end of the bar W to be supplied to the C lathe is provided, and a so-called blade (not shown) is provided at the rear end of the feed arrow 14, and the blade is a feed arrow. It is connected to a power transmission member of a driving device (not shown), for example, an endless chain (not shown) driven to rotate.

FIG. 2 shows a state in which the bar material feeder 1 is arranged in alignment with the NC lathe. NC lathe
To simplify the drawing, only the collet chuck 91 and the spindle 92 that constitute the main shaft 90 are shown.
As in FIG. 1, the first rod feeding unit 10L is the main shaft 90.
Is positioned at a position aligned with the machining center axis X--X of
On the other hand, the second bar material feeding unit 10R has the machining center axis X
─ Retracted to the side of X.

As shown in FIG. 2, the guide pipe G constitutes a so-called pipe having an annular or cylindrical shape only at its front end portion.
Except for the front end, the upper half is removed and opens upward. Therefore, the guide pipe G can smoothly receive the bar material (new material) W fed from the material shelf 15 by the material indexing plate 17. In FIG. 2, the feed arrow F of the first rod feeding unit 10L is substantially advanced to the most advanced position, and the finger chuck f of the feed arrow F is located in the main shaft 90. The bar material W gripped by the finger chuck f is finally processed by a cutting tool (not shown) of an NC lathe, and is already gripped by the collet chuck 91 as a residual material RW to be discarded. On the other hand, the bar material (new material) W is accommodated in the guide pipe G of the second bar material feeding unit 10R, and the rear end portion of the bar material W is gripped by the finger chuck f of the feed arrow F. .

The bar material feeder 1 further includes a residual material detection sensor 40 arranged at the front end of the guide pipe G for controlling the operation of the first and second bar material feeding units 10L, 10R.
A material detection sensor 50 and a temporary stop detection sensor 60 (shown only in FIG. 2) arranged in the middle of the guide pipe G.
It has and. The residual material detection sensor 40 is for detecting the carry-back of the residual material RW by the feed arrow F, and as shown in FIG. 1, a driving portion 41 attached to the pipe wall of the tubular front end portion of the guide pipe G. And a horizontally displaceable rod portion 42 penetrating the wall of the guide pipe G and protruding from the drive portion 41 into the guide pipe G. Material detection sensor 40
Urging the rod portion 42 toward the inside of the guide pipe G so that the rod portion 42 does not come into contact with the residual material RW inside the guide pipe G, and therefore the rod portion 42 is extended by the full stroke, Defective take-back of the residual material RW due to the feed arrow W is detected.

The material detecting sensor 50 is for detecting the presence or absence of the bar material W or the residual material RW protruding from the front end surface of the guide pipe G, and is adjacent to the front end surface of the guide pipe G. Drive unit 51 disposed above G
And a rod portion 5 that hangs down from the drive portion 51 and is vertically displaceable
2 and a gate portion 53 attached to the lower end of the rod portion 52
Have and. The material detection sensor 50 urges the rod portion 52 downward, and when the gate portion 53 descends to a position that closes the front end face of the guide pipe G as shown in the first rod feeding unit 10L in FIG. The complete pulling of the rod W or the residual material RW into the pipe G is detected. On the other hand, when the gate portion 53 contacts the bar W or the residual material RW and is prevented from falling, the material detection sensor 50 detects the protrusion of the bar W or the residual material RW from the front end surface of the guide pipe G. .

Further, the temporary stop detection sensor 60 uses the remaining material R
The feed arrow F gripping W with the finger chuck f is for detecting the state of being pulled into the guide pipe G, and detects the backward movement of the rear end portion of the feed arrow F at a predetermined position.
The temporary stop detection sensor 60 is composed of, for example, a contact type or non-contact type limit switch, and the temporary stop detection sensor 6
The position 0 is the residual material R gripped by the finger chuck f.
It is set so as to detect the position of the feed arrow F when W is completely retracted into the tubular front end portion of the guide pipe G.

The detection results of these sensors are obtained by the bar feeder 1.
Is input to the control unit (not shown), and when the pause detection sensor 60 detects the backward movement of the feed arrow F, the control unit stops the feed arrow F, and then the remaining material detection sensor 40 and the material detection sensor. 50 is operated to detect an abnormal state, that is, a poor take-back of the residual material RW and a protrusion of the residual material RW from the front end surface of the guide pipe G.

3 to 5 are schematic overall plan views showing the operation of the bar feeder 1 after the state shown in FIG. As shown in FIG. 2, the feed arrow F of the first rod feeding unit 10L that has advanced substantially to the frontmost position is retracted by the feed arrow drive device (not shown) after the collet chuck 91 is opened, and is temporarily stopped. When the detection sensor 60 detects the backward movement of the feed arrow F, it is stopped at a predetermined position as shown in FIG. When the control unit detects the normal retreat of the feed arrow F and the residual material RW and the complete withdrawal of both into the guide pipe G by the residual material detection sensor 40 and the material detection sensor 50, the fluid of the cylinder device 30 is detected. The control circuit is activated to extend the piston rod 31 of the cylinder device 30. The piston rod 31 moves the first rod feeding unit 10L to the left in FIG. 1 via the power transmission member 21, and at the same time, moves the first rod feeding unit 10L.
The second bar material feeding unit 10 via the connecting member 20.
R is moved to the left as viewed in FIG. When the first rod feeding unit 10L abuts against the left stopper 22 and stands still, the second rod feeding unit 10R is positioned at the center of the rod feeding machine 1 and as shown in FIG. , Align with the machining center axis X--X.

The second rod material feeding unit 10R advances the feed arrow F in accordance with the operation of the NC lathe to sequentially feed the rod materials W to the main shaft 90. The NC lathe cuts or turns the front end portion of the bar W to cut off a desired product. The bar W is
As shown in FIG. 5, the length of the rod W is shortened as it is fed by the feed arrow F. During the operation of the second bar material feeding unit 10R, the first bar material feeding unit 10L further retracts the feed arrow F together with the residual material RW (FIG. 4), and the residual material discharge mechanism removes the residual material RW. The bar W (new material) W is discharged into the guide pipe G by rotating the material indexing plate 17 (FIG. 1) (FIG. 5). First bar material feeding unit 1
0L further advances the feed arrow F, grasps the rear end portion of the bar material (new material) W in the guide pipe G by the finger chuck f, and can immediately feed the bar material W, stand by.

When the feed arrow F of the second rod material feeding unit 10R advances to the foremost position and the rod material W is left on the collet chuck 91 as the residual material RW, the second rod material feeding unit 10R is Similar to the operation of the first rod feeding unit 10L described above, the feed arrow F is moved backward until the temporary stop detection sensor detects the backward movement of the feed arrow F. When the control unit detects the complete withdrawal of the feed arrow F and the residual material RW into the guide pipe G by the residual material detection sensor 40 and the material detection sensor 50, the control unit performs fluid control so that the piston rod 31 of the cylinder device 30 retracts. The circuit is controlled, and the first and second members are connected via the power transmission member 21 and the connecting member 20.
The rod feeding units 10L, 10R are moved to the right in FIG. 1, and the first rod feeding unit 10L is aligned with the machining center axis line XX. Thus, the second bar material feeding unit 10R is realigned with the main shaft 90 of the NC lathe, and the bar material W is processed and fed by the second bar material feeding unit 10R.

As described above, in the above embodiment, the first rod feeding unit 10L and the second rod feeding unit 10R are
Alternately moved on the machining center axis X--X and alternately aligned with the spindle 90 of the NC lathe. One bar feeding unit 10
While the bar material W is being fed to the main shaft 90, the other bar material feeding unit 10 discharges the remaining material RW and feeds the bar material (new material) W into the guide pipe G. Perform an action
When the former bar material feeding unit 10 completes the feeding of the bar material W, the latter bar material feeding unit 10 stands by in a state in which the machining feeding of the bar material W can be immediately executed.

Therefore, the NC lathe can perform the processing of the bar W, that is, the cutting or turning of the product, without interrupting the cutting or turning operation during the remaining material discharging operation and the new material charging operation. Therefore, the overall production time can be shortened and the product production efficiency can be significantly improved. Further, each bar material feeding unit 10 in the bar material feeder 1 is
The material rack 15 is provided, and the possession amount of the bar W is doubled. Therefore, according to the above-described bar material feeder 1, the number of replenishment work of the bar material W to the material shelf 15 can be reduced by half.

Although the guide pipe is used as the guiding means in the above embodiment, a guide rail may be used. A shutter that can be opened and closed may be provided on the guide rail. Further, the bar material feeder 1 is provided with only two sets of bar material feeding units, but a larger number of bar material feeding units, for example, three to four bar material feeding units are supplied. It can be installed in the machine.

[0035]

As described above, according to the automatic bar material feeder of the present invention, while the bar material is fed to the bar material processing machine using the one guide member, the bar material is fed in the other guide member. Since the backward movement of the material feeding member and the feeding operation of the new material can be executed, the work interruption time of the bar processing machine which occurs during the backward movement of the bar feeding member and the feeding operation of the new material can be shortened, It is possible to improve the production efficiency of.

Further, according to the configuration of the present invention including at least two sets of bar material feeding units, the amount of new material held increases, so that the number of times of replenishing work of the new material to the material rack or the like can be greatly reduced. Is possible. Further, according to the configuration of the present invention in which the finger chuck is provided on the bar material feeding member, not only the work interruption time of the bar material processing machine due to the retreating operation and the charging operation, but also the bar accompanying the discharging operation of the residual material is performed. The work interruption time of the material processing machine can be further shortened.

Further, according to the configuration of the present invention provided with the residual material detecting sensor and the material detecting sensor, the defective take-back of the residual material,
It is possible to detect the protrusion of the residual material or the bar material, and ensure smooth lateral movement of the guide member.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an automatic bar feeder according to an embodiment of the present invention.

FIG. 2 is a schematic overall plan view of the automatic bar feeder shown in FIG.

FIG. 3 is a schematic overall plan view showing the operation of the automatic bar feeder after the state shown in FIG.

FIG. 4 is a schematic overall plan view showing the operation of the automatic bar feeder after the state shown in FIG.

FIG. 5 is a schematic overall plan view showing the operation of the automatic bar feeder after the state shown in FIG.

FIG. 6 is a schematic overall plan view showing the operation of a conventional automatic bar feeder.

FIG. 7 is a schematic overall plan view showing the operation of a conventional automatic bar feeder.

FIG. 8 is a schematic overall plan view showing an operation of a conventional automatic bar feeder.

[Explanation of symbols]

 1 Automatic Bar Material Feeder 4 Guide Rail 10 Bar Material Feeding Unit 10L First Bar Material Feeding Unit 10R Second Bar Material Feeding Unit 12 Main Frame 15 Material Shelf 17 Material Indexing Plate 20 Coupling Member 21 Power Transmission Member 22 Stopper 30 Fluid pressure type cylinder device 31 Piston rod 40 Residual material detection sensor 50 Material detection sensor 60 Temporary stop detection sensor W Bar material G Guide pipe F Feed arrow f Finger chuck

Claims (4)

[Claims] 1. A material holding means for holding a plurality of rods,
A bar member guide means extending in the bar material feeding direction, a bar material replenishing device for replenishing the bar material from the material holding means to the guide means, and a bar member of the guide member that moves along the guide member. An automatic bar feeder having a bar feeding member for feeding the bar to the bar processing machine, wherein the guide means includes first and second guide members that are laterally arranged at intervals. , The bar feed member includes first and second bar feed members respectively arranged in the first and second guide members, and the first and second guide members are provided laterally in the feeding direction. Supporting means for displaceably supporting, a drive device for the guide member for laterally moving the first and second guide members, and an operation control device for controlling the operation of the drive device are provided. Automatic bar feeder. 2. A first material holding means and a first rod replenishing device are provided adjacent to the first guide member,
A second material holding means and a second bar material replenishing device are provided adjacent to the guide member, and the first guide member, the first material holding means and the first bar material replenishing device are supported by the drive device. A first rod feeding unit that is moved laterally on the means, and the second guide member, the second material holding means, and the second rod replenishing device are moved on the supporting means by the driving device. The automatic bar feeder according to claim 1, which constitutes a second bar feeding unit that is moved toward one side. 3. A finger chuck for gripping the rear end of the bar and bringing back the residual material of the bar processing machine to the bar feeder is provided at the front end of the bar feeding member. The automatic bar feeder according to claim 1 or 2. 4. The operation control device includes a residual material detection sensor and a material detection sensor arranged at a front end portion of the guide means, and the residual material detection sensor is a take-back material of the residual material by the bar feeding member. The presence or absence of, the material detection sensor,
The automatic bar material feeder according to claim 3, wherein a protrusion of a bar material or a residual material from the front end of the guide means is detected.