JP2001246502A - Bar supplying machine and bar supply controlling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems of bar deflection and noise in a bar supplying machine having a bar feed member adapted to move synchronously with the headstock of a main spindle moving type bar working machine while a bar is worked. SOLUTION: This bar supplying machine has the bar feed member adapted to move synchronously with the headstock of the main spindle moving type bar working machine while a bar is worked. The machine has a pair of bodies of rotation for the feed member driven to rotate by a drive means, an endless member for the feed member wound on the bodies of rotation to advance the feed member toward the working machine, and a constant space keeping means for moving the endless member synchronously with the movement of the headstock as keeping constant the space between the feed member and the headstock while a bar is worked. The supplying machine is characterized in that the keeping means has a space changing means for widening the space by a specified distance by moving the endless member so that the feed member is retreated by the specified distance relative to the headstock in order to remove deflection of a bar held by the feed member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar feeder and a bar feed control method for feeding a bar to a spindle moving type bar processing machine such as a lathe.

2. Description of the Related Art A bar feeder for feeding a bar forward to a bar processing machine by a bar feed member (feed arrow) has been known. The bar feed member is generally connected to an endless chain wound around a sprocket driven by a motor. A finger chuck for gripping the rear end of the bar is provided at the front end of the bar feed member, and the rear end of the bar is inserted into the finger chuck.
The bar feed member moves forward along with the travel of the endless chain, and feeds the bar toward the bar processing machine. When the tip of the bar abuts against the stopper of the bar processing machine, the bar is gripped by the collet chuck of the bar processing machine, and the bar is processed while the headstock moves back and forth.

[0002] Even during the processing of a bar, a motor is continuously driven so that the rear end of the bar does not come off from the finger chuck, and a biasing force is applied to the bar by a bar feed member. ing. When the headstock is retreated, the bar is pushed back against the urging force given by the bar feeder, particularly when the bar processing machine is of a movable spindle type, whereby the bar may be bent. . In order to solve such a problem that occurs when the headstock retreats, for example, as in an apparatus disclosed in Japanese Patent Publication No. 6-88165, a bar feeder is connected to a headstock of a spindle moving type bar processing machine. There is known a bar feeder that is configured to be retracted in conjunction with a bar.
In such an apparatus, since the bar feed bar moves back and forth by the same distance in synchronization with the headstock, the bar does not bend due to the load caused by the headstock moving backward with respect to the bar. .

[0003]

However, even in the apparatus constructed as described above, when the bar is fed forward by the bar feed bar and comes into contact with the stopper of the bar processing machine, the bar is not moved. It is urged against the stopper by the bar feeding member, and particularly when the bar is thin, it is bent by the urging force. As described above, during the bar processing, the headstock and the bar feed member move by the same distance as the headstock, but they move synchronously with the initial deflection. When the bar is processed in this state, the bar is rotated at high speed by the main shaft,
The bar hits the inner wall and causes noise. In addition, if the bar deflects, it cannot be processed precisely. Therefore,
The present invention relates to a bar feeder in which a bar feeder of a bar feeder is interlocked with a headstock of a moving spindle type bar processing machine during bar processing. It is an object of the present invention to provide a bar feeder capable of solving the problem.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bar material in which a bar feed member of a bar feeder is interlocked with a headstock of a moving spindle type bar processing machine during bar processing. A feeder, wherein a pair of rotating members for a feed member, which are rotationally driven by driving means, and the bar feeding member wound around the rotating member for the feeding member, are moved toward a spindle moving type bar processing machine. The end member for the feed member to be urged, and the end member for the feed member interlocked with the movement of the headstock while maintaining a constant distance between the bar feed member and the headstock during the bar processing. Fixed interval maintaining means for moving the fixed interval, the constant interval maintaining means,
In order to remove the bending of the bar held by the bar feed member, the bar feed member is retracted by a predetermined distance with respect to the headstock against the urging force of the end member for the feed member. Moving the endless member for the feed member to have the interval changing means to widen the interval by the predetermined distance,
This can be solved by a bar feeder characterized in that:

[0005] The bar feeder according to the present invention operates as follows. The bar feed member is driven forward by the feed member rotating body and the feed member endless member, whereby
The bar is fed forward until it comes into contact with the stopper of the bar processing machine. At this time, since the bar is urged against the stopper by the bar feed member, the bar is bent. Subsequently, the constant interval maintaining means is operated, and the endless member for the feed member moves in conjunction with the movement of the headstock while maintaining a constant interval between the headstock and the bar feed member. Further, the endless member for the feed member is moved by the interval changing means so as to retreat the bar feed member with respect to the headstock by a predetermined distance, and the bar is straightened to remove the bending of the bar. The bar processing is continued while the space between the bar and the headstock is maintained at the space widened by the predetermined distance by the constant space maintaining means. According to the present invention, since the bending caused by the urging force of the bar feeding member by the bar feeding member is removed by the interval changing means, the bar can be processed in a straight state, and the bar can be processed by noise and runout. The problem is solved. The present invention is particularly advantageous when it is desired to start bar processing immediately after the bar has been fed forward so as to meet the demand for high-speed processing. By the means, the bar feed member is retracted by a predetermined distance with respect to the headstock. Therefore,
Even if the interval is changed during the movement of the headstock, the interval is changed by a predetermined distance. That is, when the bar feeder moves backward while the headstock is moving forward, there is an effect that the bar does not fall off the finger chuck.

Another object of the present invention is a bar supply control method for supplying a bar to a spindle moving bar processing machine while urging the bar forward with a bar feed member. The bar is moved forward by a bar feed member, urged against a stopper provided in a spindle moving bar processing machine, grips the bar with a collet chuck, and grips the bar with a collet chuck. While maintaining the interval between the feed member and the headstock, the bar feed member and the headstock can be interlocked, the bar feed member, against the urging force of the feed member, The bar feed is retracted by a predetermined distance with respect to the headstock to remove the bending of the bar, and the bar feed is maintained by widening the distance between the bar feed member and the headstock by a predetermined distance. The product processing is performed by linking the Terminates, it can be solved by bar supply control method according to claim. According to the present invention, since the bar feed member is retracted by a predetermined distance with respect to the headstock to remove the bending of the bar, noise and vibration due to the bending of the bar and the accuracy of the bar processing are solved. can do. The step of retreating the bar feed member and removing the bending of the bar is performed after the headstock and the bar feed member can be interlocked, before and after starting the bar processing, and It may be moving or stopped. However, in the present invention, since the bar feed member is retracted by a predetermined distance based on the headstock, even when the barstock is moved after the start of bar processing, the bar is reliably bent. The bar feed member can be moved by a predetermined distance necessary for removal. In particular, even if the bar feed member is moved rearward to change the interval while the headstock is moving forward, the bar does not fall off the feed arrow. Further, if the interval is changed after the start of the bar processing, the time required for the bar feeding and the bar processing is not prolonged.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Various embodiments of a bar feeder and a control method thereof according to the present invention will be described. FIG. 1 is a perspective view of a bar feeder according to the embodiment. As shown in FIG. 1, the bar feeder 2 is installed behind and adjacent to a main bar moving type bar processing machine 4. The bar processing machine 4 includes a headstock 6 that moves back and forth during the processing of the bar. In front of the headstock 6, a cutting tool 8 for processing the bar and a penetrating headstock are provided. And a guide bush 11 for guiding the bar material protruding forward. The cutting tool 8 is provided so as to be able to protrude and retract between a stopper position for blocking the bar feed path, a processing position near the peripheral surface of the bar, and a retracted position. When the cutting tool 8 is at the stopper position, the leading end of the cutting rod is brought into contact with the cutting rod when the cutting rod is fed forward, and the cutting rod 8 serves as a stopper. The headstock 6 is provided with a rotatable main shaft (not shown) therein, and a collet chuck 10 provided at the tip of the main shaft for gripping a bar.

The bar feeder 2 has a bar feed member or feed arrow 12 for feeding a bar into the main shaft of the bar processing machine 4, and a bar feeder 12 for moving the feed arrow 12 forward. An endless member transmission 14 for a feed member, a driving means or a motor 16 for driving the endless member transmission 14 for a feed member,
A constant interval maintaining means 18 for moving the endless member for the feed member in conjunction with the movement of the headstock 6 so that the interval between the feed arrow 12 and the headstock 6 is maintained constant during the bar processing. Have. The feed member endless member transmission device 14 includes a pair of feed member rotating bodies or feed member sprockets 20, and a feed member endless member or feed member endless chain 22 wound around the feed member sprocket 20. .
A blade portion 12a provided at the rear end of the feed arrow 12 has a lower portion 22a of a feed member endless chain 22 that circulates and travels linearly toward the bar processing machine 4 during the feeding of the bar. It is attached to.

As will be described later in detail, the constant interval maintaining means 18 moves the feed arrow 12 backward with respect to the headstock 6 by a predetermined distance in order to remove the bending of the bar held by the feed arrow 12. There is provided a distance changing means 24 for moving the endless chain 22 for the feed member to widen the distance by a predetermined distance. The constant interval maintaining means 18 further includes a linear motion transmitting means 26 connected to the headstock 6 of the bar processing machine 4 and performing a linear motion in synchronization with the movement of the headstock 6, and a linear motion transmitting means 26. Linear motion converting means 2 for converting the linear motion of the
8 and an electromagnetic clutch 30 interposed between the linear motion converting means 28 and the feed member sprocket 20 for detachably connecting the linear motion converting means 28 to the feed member sprocket 20. And a controller 32 for controlling the operation of the bar feeder 2.

FIGS. 2 and 3 are diagrams showing details of the interval changing means 24. FIG. The linear motion transmission means 26 is attached to the base of the bar feeder 2 and a synchronous shaft 34 having one end extending horizontally from the headstock 6 toward the bar feeder 2,
A linear guide 36 extending parallel to the moving direction of the headstock 6, and a sliding member 38 slidably provided on the linear guide 36 and fixed to the other end of the synchronous shaft 34.
And The synchronous shaft 34 extends above and parallel to the linear guide 36. As can be seen from FIG. 2, the sliding member 38 has a substantially U-shaped shape which is released upward in a side view, and the linear guide 36
Rear plate portion 3 that extends straight down toward
8a, a front plate portion 38b extending in front of the rear plate portion 38a, spaced apart and parallel to each other, and a slide extending between the lower ends of the rear plate portion 38a and the front plate portion 38b and sliding on the linear guide 36. Moving part 38
c. A space is formed between the rear plate portion 38a and the front plate portion 38b.

A main body of a cylinder 40 constituting the space changing means 24 is fixed to a front surface of the front plate portion 38b of the sliding member 38. The rod 42 of the cylinder 40 projects into the space through the front plate portion 38b. The rod 42 extends rearward in parallel with the endless chain 22 for the feed member.
At the tip of the rod 42, a contact plate 44 that moves in the lateral direction in the space as the rod 42 advances and retreats is attached. An adjusting means or an adjusting bolt 46 is provided on the rear plate portion 38a in parallel from the rear surface side into the space. The adjustment bolt 46 is provided so as to be able to advance and retreat with respect to the contact plate 44. When the rod 42 projects (FIG. 3), the contact plate 44 at the tip thereof comes into contact with the tip of the adjustment bolt 46, whereby
The predetermined distance d in which the contact plate 44 moves is adjusted.
That is, the distance d between the rear surface of the contact plate 44 and the front end of the adjustment bolt 46 is equal to a predetermined distance required to remove the bending of the bar, as described later.

The linear motion conversion means 28 is constituted by a conversion endless member transmission device, and includes a pair of rotating bodies or conversion sprockets 48 provided at the front and rear, and an endless member or conversion sprocket wound around the conversion sprocket 48. And an endless chain 50. Front conversion sprocket 48
Is connected via an electromagnetic clutch 30 to a drive shaft 52 of a front sprocket for a feed member so as to be freely detachable. Further, at one end of the drive shaft 52, a motor 16 for driving the bar feed member is provided, whereby the drive shaft 52 is driven to rotate. The upper end of the contact plate 44 of the distance changing means 24 is connected to the lower part 50a of the linearly traveling upper part and lower part of the endless chain 50 for motion conversion that circulates. At the tip of the feed arrow 12, a finger chuck 12b for gripping the bar is provided by inserting the rear end of the bar.

FIG. 4 is a diagram showing a control flow of the bar processing machine and the bar feeder according to the present embodiment. The operation and control of the bar feeder 2 according to the present embodiment will be described with reference to FIG. First, the feed arrow 12 is initially waiting on the rear end side of the bar feeder 2. In addition, the operator moves the bar in accordance with the thickness of the bar to be processed.
The protrusion of the adjusting bolt 46 is adjusted such that the bending of the bar when pressed against the stopper (bite) 8 by the tool 2 is predicted, and the predetermined distance is a distance necessary for removing the bending. .

When the bar feeder 2 is started, the motor 16 is turned on by the controller 32 (step S).
1) The cutting tool 8 projects to the stopper position (Step S)
2) Also, the collet chuck 10 opens (step S)
3). Subsequently, the electromagnetic clutch 30 is turned off (step S4), the connection between the conversion sprocket 48 and the drive shaft 52 is released, and the conversion sprocket 48 is rotatable. Further, the cylinder 40 is turned off (step S
5), and the rod 42 moves to the retracted position (FIG. 2). At the same time, the spindle starts to retreat (step S
5). When the retraction of the spindle is completed (step S6), and the bar is moved forward by the feed arrow 12 and abuts against the stopper 8, the collet chuck 10 is closed (step S7), and the tip of the bar is gripped. You. Subsequently, the electromagnetic clutch 30 is turned on (step S8), the conversion sprocket 48 is connected to the drive shaft 52, and the headstock 6 and the feed arrow 12 can be interlocked.

Subsequently, the cutting tool 8 is retracted to the processing position where the bar is processed, and the product processing is started (step S).
9) While the headstock 6 moves back and forth, the cutting tool 8 processes the product. Meanwhile, regular interval maintaining means 18
As a result, the distance between the headstock 6 and the feed arrow 12 is maintained at the distance when the collet chuck 10 is closed,
The feed arrow 12 and the headstock 6 move in synchronization. More specifically, the synchronous shaft 34 moves with the movement of the headstock 6, whereby the sliding member 38 moves along the linear guide 36. As a result, the conversion endless member is moved via the contact plate 44 provided at the tip of the rod 42 of the cylinder 40, and the movement is performed by the conversion sprocket 48 and the drive shaft 5.
2. It is transmitted to the sprocket for the feed member and further to the endless chain 22 for the feed member, and the feed arrow 12 moves synchronously while maintaining a predetermined interval with the headstock 6. Almost simultaneously with the start of the machining, the cylinder 40 is turned on (step S9), and the rod 42 projects (FIG. 3).
When the contact plate 44 contacts the tip of the adjustment screw 46,
That is, when the rod 42 projects by a predetermined distance, the endless chain for conversion 50 is pushed back by a predetermined distance, whereby the feed arrow 12 is retracted by the predetermined distance by the endless transmission for feed member 14 via the drive shaft 52. , The bars are straightened and the deflection is removed.

When the product processing is completed (step S1)
0), the headstock 6 is stopped (step S11). If the length of the remaining material is not enough to process the product further (step S12), the motor 16 is reversed (step S13), the feed arrow 12 is retracted, and the remaining material is removed. Perform processing. The motor 16 is turned off (step S1).
4) The supply and processing of the bar are completed. Step S1
In step 2, if the length of the remaining material is longer than the length of the product to be processed, the process returns to step S2, and the steps from step S2 to step S12 are repeated.

According to the present embodiment, the interval changing means 24
The feed arrow 12 is retracted by a predetermined distance with respect to the headstock 6 to remove the bending of the bar caused when the bar is urged against the stopper of the bar processing machine 4 by the feed arrow 12. Therefore, during processing of the bar, noise and vibration caused by the rotation of the bar hitting the inner wall of the main shaft, and furthermore, problems relating to precision processing of the bar due to vibration can be solved. Since the change of the interval causes the feed arrow 12 to retreat by a predetermined distance with respect to the headstock 6 even when the headstock 6 is largely moving forward,
The bar does not fall off the finger chuck 12b of the feed arrow 12. Therefore, it can be performed even while the headstock 6 is moving, and the bar processing time is not prolonged. In the present embodiment, this is achieved by integrally moving the cylinder 40 and the headstock 6 via the synchronous shaft 34 and the sliding member 38, and projecting the rod 42 of the cylinder 40 by a predetermined distance. 6, the feed arrow 12 is moved backward by a predetermined distance.

In this embodiment, the cylinder 4
0 is linearly moved by a predetermined distance, whereby the connection point with the rod 42 provided on the lower part 50a of the endless conversion chain 50 that moves linearly is linearly moved by a predetermined distance. 12 is linearly moved backward by a predetermined distance. Therefore. Since the predetermined distance can be directly adjusted by adjusting the amount of movement of the rod 42, control is easy. Further, in the present embodiment, the contact plate 4 provided at the tip of the rod 42
Since the adjusting screw which advances and retreats with respect to 4 is provided, the projecting distance of the rod 42 can be easily adjusted by the bending amount of the bar.

The present invention is not limited to the embodiments described above, and various changes can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say, it is. In the present embodiment, the cylinder 40 is provided on the side of the bar feeder 2, and the cylinder 4 is provided via the synchronous shaft 34 and the sliding member 38.
Although the cylinder head 40 and the headstock 6 move integrally, the cylinder 40 may be directly attached to the headstock 6 and move integrally with the headstock 6. In this case, the pair of conversion sprockets 48 of the linear motion conversion means 28 move to the vicinity of the cylinder 40 on the bar processing machine 4 side,
What is necessary is just to connect the rod 42 to the connection point of the conversion endless chain 50. Further, in the present embodiment, the constant interval maintaining means 18 is constituted by the transmission device 28 for the endless conversion member, the synchronous shaft 34 for transmitting the movement of the headstock 6, and the cylinder 40. This structure is described in, for example, Japanese Patent Publication No. 6-88165.
As in the device disclosed in FIG. 3 of the above publication, the operation may be performed by a pinion mechanism in which one end is fixed to the headstock 6 and the other end is engaged with a pinion. In this case, the rod 42 of the cylinder 40 is connected to the rack, and the rod 40 is protruded to move the rack backward by a predetermined distance with respect to the headstock 6. Adjust the interval.

Further, in the present embodiment, the case where the bar feeder is used in combination with the spindle moving type bar processing machine has been described. It does not prevent use in combination with a material processing machine. Even in the spindle fixed type bar processing machine, the bar may be bent by the urging force of the feed arrow 12, and the bar feeder 2 according to the present embodiment pushes the feed arrow 12 back by a predetermined distance, thereby This can be eliminated. Furthermore, the cylinder 40, the contact plate 44, the adjusting screw 46, the endless member transmission device 28 for conversion, and the clutch 30 provided on the drive shaft 52 according to the present embodiment make the feed arrow 12 and the headstock 6 And a feeder interval changing device for changing the interval between them may be provided in a bar feeder used in combination with a fixed spindle type bar processing machine. In this case, since the headstock 6 does not move, the cylinder 40 does not need to be slidably provided by the linear guide 36 and the sliding portion 34c, and the cylinder 40 may be fixed to the base of the bar feeder.

Further, in this embodiment, the rod 42
There is an adjustment screw for adjusting the amount of protrusion of
Although useful for adjusting the predetermined distance, when the amount of deflection of the bar is substantially constant, the amount of protrusion of the rod 42 may be fixed in advance, and the adjusting screw is not essential. Further, the endless member transmission device for conversion 28 and the endless member transmission device for feed member 14 in the present embodiment are constituted by sprockets and endless chains, but they may be constituted by pulleys and endless belts. Furthermore,
In this embodiment, the cylinder 40 is turned on almost simultaneously with the start of product processing, and the interval is changed, so that the time required for bar supply and product processing is not prolonged, and This is advantageous in preventing noise due to material runout and ensuring processing accuracy. However, cylinder 4
In the step of turning 0 on, the clutch is turned on (step S
8) As long as the headstock 6 and the feed arrow 12 can be interlocked, it may be before or after the start of product processing, or while the headstock is moving or stopped. Furthermore, the control order of each step of steps S2 to S5 and each step of steps S7 and S8 in the present embodiment does not necessarily have to be performed in the order shown in FIG. 3 and may be performed in any order.

According to the present invention, there is provided a bar feeder in which a bar feeder of a bar feeder is interlocked with a headstock of a spindle moving type bar feeder during bar processing. A bar feeder capable of solving the problem of runout and noise of a bar can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bar feeder according to an embodiment of the present invention.

FIG. 2 is a diagram showing details of an interval changing unit.

FIG. 3 is a diagram showing details of an interval changing unit.

FIG. 4 is a diagram showing a control flow of a bar processing machine and a bar feeder according to the embodiment.

[Explanation of symbols]

 Reference Signs List 2 bar feeder 4 spindle moving bar processing machine 6 headstock 10 collet chuck 12 feed arrow (bar feed member) 14 endless member transmission device for feed member 18 fixed interval maintaining means 20 rotary member for feed member 22 feed member Endless chain 24 interval changing means 30 electromagnetic clutch 34 synchronous axis 40 cylinder 42 rod 46 adjusting bolt (adjusting means) 52 drive shaft

Claims (6)

[Claims] 1. A bar feeder in which a bar feeder of a bar feeder is interlocked with a headstock of a moving spindle type bar processing machine during bar processing, and is driven to rotate by driving means. A pair of feed member rotating bodies, a feed member endless member wound around the feed member rotary body, and urging the bar feed member toward a main spindle moving bar processing machine; A constant interval maintaining means for moving the endless member for the feed member in conjunction with the movement of the headstock while maintaining a constant interval between the bar feed member and the headstock during material processing. The constant interval maintaining means removes the bending of the bar held by the bar feeding member, and moves the bar feed member against the urging force of the endless member for the feeding member, The endless member for the feed member is moved so as to retreat by a predetermined distance from With interval changing means to widen the gap by the predetermined distance, the bar feeder, characterized in that. 2. The fixed-interval maintaining means further includes a cylinder provided so as to linearly move integrally with the headstock, and a linear motion of the headstock converted into a rotational motion by the feed member rotating body. Linear motion conversion means for transmitting the linear motion conversion means, the linear motion conversion means has a pair of conversion rotary body, and a conversion endless member wound around the conversion rotary body, one of The conversion rotary member is provided coaxially with the feed member rotary member via clutch means, and the rod of the cylinder is connected at a connection point to a linearly moving portion of the conversion endless member. 2. The rod supply according to claim 1, wherein the rod protrudes, so that a connection point moves so as to retreat the rod feed member by the predetermined distance with respect to the headstock. 3. Machine. 3. The apparatus according to claim 2, wherein the distance changing means includes an adjusting means provided so as to be capable of moving forward and backward with respect to the rod, and for adjusting a predetermined distance to a desired distance by restricting a projection amount of the rod.
The bar feeder according to claim 2, wherein: 4. A bar feeder configured to feed a bar while urging the bar forward by a bar feeder member moved by an endless member for a feed member wound around a rotary member for the feed member. A feed member interval changing device for changing an interval between a bar feed member and a headstock of a bar processing machine, comprising: a cylinder; a pair of rotary members for conversion; An endless conversion member wound around a body, and clutch means for releasably connecting one of the conversion rotary member and a drive shaft for driving the feed member rotary member; Is connected at a connection point to a linearly moving portion of the conversion endless member. When the rod projects, the connection point moves the bar feed member to the headstock with the predetermined distance. Just move to retreat, Feeding member interval changing apparatus characterized and. 5. A bar supply control method for supplying a bar to a spindle moving type bar processing machine while urging the bar forward with a bar feeder, wherein the bar is advanced by the bar feeder, Between the bar feeder and the headstock when the bar is urged against a stopper provided in the movable bar processing machine, the bar is gripped by the collet chuck, and the bar is gripped by the collet chuck. The bar feed member and the headstock can be interlocked while maintaining the distance between the bar feed member and the bar feed member against the urging force of the feed member by a predetermined distance with respect to the headstock. Retracting and removing the bending of the bar, maintaining the space between the bar feed member and the headstock expanded by a predetermined distance, interlocking the bar feed member and the headstock. To finish product processing. Bar feeder control method. 6. A bar supply control method for supplying a bar to a spindle moving type bar processing machine while urging the bar forward with a bar feeder, wherein the bar is advanced by the bar feeder, and Between the bar feeder and the headstock when the bar is urged against a stopper provided in the movable bar processing machine, the bar is gripped by the collet chuck, and the bar is gripped by the collet chuck. While maintaining the distance, the bar feed member and the headstock can be interlocked to start product processing, and the bar feed member is positioned with respect to the headstock against the urging force of the feed member. The bar is fed back by a predetermined distance to remove the bending of the bar, and the bar-feeding member and the spindle are maintained at an interval where the distance between the bar-feeding member and the headstock is widened by a predetermined distance. Finish product processing by linking with the table Bar stock supply control method characterized by.