JP2006130611A - Clamp device for rod feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clamp device for a rod feeder, which prevents deformation of a slender rod at the time of centering and clamping the same. <P>SOLUTION: The clamp device 27 for the rod feeder 1 is provided with clamp pieces 28a, 28b for clamping the rod A, and centering guide pieces 29a, 29b for centering the same. In the clamp device, the plurality of centering guide pieces 29a, 29b are arranged at a predetermined interval along an axial direction of the rod A, and all the centering guide pieces 29a, 29b are arranged so as to assume a non-pressing position with respect to the rod A when the centering of the rod A is completed and the clamp pieces 28a, 28b clamp the rod A. Thus even if the rod has a slender shape, its deformation can be prevented, and gripping of the rod by a finger chuck can be correctly carried out. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a clamp device for temporarily holding a bar in a bar feeder that supplies the bar to a processing machine such as a lathe.

  The bar supply machine grips the rear end of the bar with the finger chuck 8a at the front end of the feed rod, and slides the feed rod on the support rail together with the bar to process the bar from the front end to an automatic lathe. Supply to the machine. The processing machine grips the tip of the bar with its main shaft, rotates and cuts it with a blade, and the bar supply machine supports the bar rotating with the main shaft with the support rail and the finger chuck 8a.

  When the bar is loaded into this bar feeder, the bar is dropped into the center of the bar feeder and temporarily fixed by a clamp device, and then the feed rod is advanced to the finger chuck 8a at the tip of the feed rod. The rear end of the bar is inserted inside. When the finger chuck 8a grips the bar, the bar is released from the restraint by the clamp device, and is sent to the processing machine and processed as described above.

  The clamp device has a pair of clamp pieces that sandwich the bar loaded in the center of the bar feeder from above and below, and the pair of gripping pieces are open before the bar comes, and are closed when the bar comes. To fix the bar material from above and below. Further, the clamping device is provided with a centering guide piece having a V-shaped groove, and the bar is introduced into the V-shaped groove of the centering guide piece when the bar is gripped by the gripping piece. As a result, the bar is fixed at a fixed position in a state of being centered so that its axis coincides with the center of the finger chuck 8a. Thereafter, when the feed rod advances and the finger chuck 8a at the tip grips the rear end of the bar, the clamp piece of the clamp device is separated from the bar.

  In order to properly operate the bar feeder, it is necessary to detect whether or not the clamp device is clamping the bar. Conventionally, the position of the piston such as an air cylinder that opens and closes the clamp piece is used. Is detected by a limit switch attached to the cylinder, the rotation position of the lever holding the clamp piece is detected by a limit switch, the centering guide piece is slidably supported, and the centering guide piece is slid to a fixed position. The presence or absence of a bar is confirmed by detecting the time with a limit switch (for example, see Patent Document 1).

JP 11-254203 A

  When the bar is relatively thick and rigid and it is not necessary to consider deformation such as bending, the center of the bar can be centered by the conventional centering guide piece, and the presence or absence of the bar can be detected. . However, if the bar is extremely thin, for example, 1 mmφ or less, deformation such as bending that occurs in the bar increases, the centering becomes incomplete, and the bar may not be gripped by the finger chuck. There are cases where the presence or absence of a material cannot be detected.

  An object of this invention is to provide the clamp apparatus of the bar feeder which can solve such a problem.

  In order to solve the above-mentioned problem, the invention according to claim 1 includes a clamp piece (28a, 28b) for gripping the bar (A), and a centering guide piece (29a, 29b) for centering the bar (A). In the clamp device (27) of the bar feeder (1) provided with a plurality of centering guide pieces (29a, 29b) provided at predetermined intervals in the axial direction of the bar (A), The guide pieces (29a, 29b) are not pressurized against the bar (A) when the centering of the bar (A) is completed and the clamp pieces (28a, 28b) clamp the bar (A). The clamp apparatus (27) of the provided bar feeder (1) is employed.

  According to a second aspect of the present invention, in the clamp device (27) of the bar feeder (1) according to the first aspect, the plurality of centering guide pieces (29a, 29b) are connected to each other. The clamp device (27) of the material feeder (1) is employed.

  The invention according to claim 3 is centered by the plurality of centering guide pieces (29a, 29b) in the clamp device (27) of the bar feeder (1) according to claim 1 or claim 2. The clamp device (27) of the rod feeder (1) provided with the proximity switch (39) for detecting the rod (A) without contact is adopted.

  According to the first aspect of the present invention, the bar provided with the clamp pieces (28a, 28b) for holding the bar (A) and the centering guide pieces (29a, 29b) for centering the bar (A). In the clamping device (27) of the feeder (1), a plurality of centering guide pieces (29a, 29b) are provided at predetermined intervals in the axial direction of the bar (A), and all centering guide pieces (29a, 29b) are provided. 29b) is provided such that when the centering of the bar (A) is completed and the clamp pieces (28a, 28b) clamp the bar (A), the bar (A) is not pressurized. The bar (A) can be centered at a plurality of locations in the axial direction, and the centering guide piece (29a, 29b) with respect to the bar (A) at the same time as the centering and clamping are completed. It can be non-pressurized state. Therefore, even if the bar (A) is thin, it can be properly centered while preventing deformation such as bending, and the bar (A) can be accurately gripped by the finger chuck (8a). it can.

  According to the invention of claim 2, in the clamp device (27) of the bar feeder (1) according to claim 1, the plurality of centering guide pieces (29a, 29b) are connected to each other. Therefore, the position adjustment of the plurality of centering guide pieces (29a, 29b) can be performed easily and quickly.

  According to the invention of claim 3, in the clamp device (27) of the bar feeder (1) according to claim 1 or claim 2, it is centered by the plurality of centering guide pieces (29a, 29b). Since the proximity switch (39) for detecting the bar (A) without contact is provided, the presence or absence of the bar is accurately detected even if the bar (A) is thin, and the bar (A) It is possible to prevent the bar feeder (1) from being operated while the feed is idle. Further, since the bar (A) does not contact the proximity switch (39), deformation of the bar (A) accompanying detection of the bar (A) can be prevented.

  The best mode for carrying out the invention will be described below with reference to the drawings.

  As shown in FIG. 1, the bar feeder 1 is installed horizontally on the floor, and an NC lathe 2 which is a bar processing machine is installed adjacent to the bar feeder 1.

  The mechanism unit shown in FIGS. 2 and 3 is installed on the frame 1a shown in FIG. 1 of the bar feeder 1, and this mechanism unit is covered with a cover 1b connected to the frame 1a so as to be opened and closed. Further, a bar supply shelf (not shown) for storing a large number of bar materials and sending them one by one to the mechanism unit is arranged behind the bar material feeder 1 shown in FIG.

  As shown in FIG. 2 to FIG. 4, the mechanism of the bar feeder 1 includes one front guide member 3, two rear guide members 4 and 5 coupled in parallel, and two Connection switching means 6 for selectively connecting either one of the rear guide members 4 and 5 to the front guide member 3, and the front guide member 3 and one rear guide member 4 as shown in FIG. The primary introduction member 7 that feeds the rod A loaded so as to stride over the front guide member 3 while sliding on the one rear guide member 4, and the rod A is fed onto the front guide member 3, As shown in FIG. 3, when the other rear guide member 5 is connected to the front guide member 3 by the connection switching means 6, the bar A is moved forward while sliding from the other rear guide member 5 to the front guide member 3. A secondary introduction member 8 that is further advanced on the part guide member 3.

  As shown in FIG. 1, the front guide member 3 is disposed at a location near the NC lathe 2 on the frame 1a. As shown in FIGS. 2 and 3, the front guide member 3 is formed of a groove material having a substantially U-shaped cross section, and as shown in FIG. 1, the extension line of the axis is the axis of the main shaft 2a of the NC lathe 2. It is fixed on the frame 1a so as to match. The groove of the front guide member 3 has a size and a shape that can receive and store one falling bar A. The bar A can be of various diameters, lengths, and materials, but the bar A used in this embodiment is a thin metal bar that is 1 mmφ or less and is easily bent.

  The rear guide members 4 and 5 are configured in two upper and lower stages as shown in FIGS. The upper rear guide member 4 and the lower rear guide member 5 are integrated by being fixed to the front and rear bases 9 and 10 at their front and rear ends, and the rear base 10 is integrated with the frame 1a via the horizontal pivot shaft 11. Retained. As shown in FIG. 2, the horizontal pivot 11 is supported at both ends on the frame 1 a via bearings 12 and 13. As a result, the upper and lower rear guide members 4, 5 can be integrally rotated up and down on the frame 1a with the horizontal pivot 11 as a fulcrum.

  The grooves of the groove members constituting the upper and lower rear guide members 4 and 5 have a size and a shape that can receive and store the rear part of one falling bar A.

  As shown in FIGS. 3 and 4, the connection switching means 6 is specifically a cylinder / piston device, and this cylinder / piston device is disposed between the front base 9 and the frame 1a. The lower rear guide member 5 and the front guide member 3 communicate with each other in a straight line as shown in FIG. 3 by the extending operation of the cylinder / piston device, and the upper and lower stages as shown in FIG. The rear guide members 4 and 5 rotate downward with the horizontal pivot 11 as a fulcrum, and the upper rear guide member 4 communicates with the front guide member 3. FIG. 4A shows the posture of the rear guide members 4 and 5 when receiving a new material of the rod A, and the rod A is loaded so as to straddle the front guide member 3 and the upper rear guide member 4. In the groove, the bar A bends as shown by the solid line in FIG.

  As shown in FIGS. 2 to 4, the primary introduction member 7 is a slider that slides in the groove of the upper rear guide member 4, and is specifically formed of a round bar. As shown in FIGS. 2 to 4, a winding transmission device is employed as the driving means for the primary introduction member 7.

  The winding transmission device includes an endless timing belt 14 that is a winding body, front and rear pulleys 15 and 16 around which the endless timing belt 14 is wound, and a motor 17 that is a driving source. The primary introduction member 7 is connected to the endless timing belt 14 via a connection arm 18. The front pulley 15 is a driven vehicle and is rotatably held by the rear guide members 4 and 5 via the front base 9 as shown in FIG. The rear pulley 16 is a prime mover and is held on the horizontal pivot 11 via a primary introduction clutch 19 which is an electromagnetic clutch. The motor 17 is installed on the frame 1a, and its output shaft is coupled to the shaft end of the horizontal pivot 11 which is a driving shaft through a coupling 17a. When the primary introduction clutch 19 is turned on, the rotation of the motor 17 is transmitted from the rear pulley 16 to the endless timing belt 14, and the primary introduction member 7 slides in the upper rear guide member 4. The motor 17 can be rotated forward or backward, and the primary introduction member 7 moves forward or backward in the upper rear guide member 4 in accordance with forward or reverse rotation of the motor 17. When the front and rear guide members 3 and 5 are connected to the state shown in FIG. 4A, and the rod A is inserted into the grooves of the guide members 3 and 5 as shown in FIG. Advances in the rear guide member 5 in the upper stage, and feeds the bar A to the front guide member 3.

  As shown in FIGS. 2 and 3, the secondary introduction member 8 is a slider that slides in the groove of the lower rear guide member 5, and is specifically formed of a round bar. A finger chuck 8 a that holds the rear end of the bar is provided at the front end of the secondary introduction member 8. The finger chuck 8 a is connected to the tip of the secondary introduction member 8 via a bearing and is rotatable on the axis of the secondary introduction member 8.

  As shown in FIGS. 2 and 3, a winding transmission device is employed for the driving means of the secondary introduction member 8 as in the case of the primary introduction member 7.

  The winding transmission device includes an endless timing belt 20 that is a winding body, and front and rear pulleys 21 and 22 around which the endless timing belt 20 is stretched. As a driving source, a motor 17 for driving the primary introduction member 7 is shared. The front pulley 21 is a driven vehicle, and is rotatably held via a bearing 23 at a position near the NC lathe 2 in the frame 1a. The rear pulley 22 is a prime mover, and is held on the horizontal pivot 11 via a secondary introduction clutch 24 that is an electromagnetic clutch. As a result of the endless timing belt 20 being stretched between the front and rear pulleys 21 and 22, the endless timing belt 20 extends horizontally between the front and rear ends of the bar feeder. The secondary introduction member 8 is connected to the endless timing belt 20 via a connection arm 25. When the secondary introduction clutch 24 is turned on, the rotation of the motor 17 is transmitted from the rear pulley 22 to the endless timing belt 20, and the secondary introduction member 8 is moved to the lower rear guide member 5 and the front part according to the forward and reverse rotation of the motor 17. The guide member 3 moves forward or backward. When the bar A is fed into the front guide member 3 by the primary introduction member 7 in the state shown in FIG. 4A, the rear guide members 4 and 5 are moved from the state shown in FIG. In the state shown in FIG. 3, the secondary introduction member 8 slides from the lower rear guide member 5 to the front guide member 3, and the bar A is further advanced on the front guide member 3. As a result, the bar A is fed into the NC lathe 2 and processed by the NC lathe 2.

  As shown in FIG. 2, a rotary encoder 26 is attached to the other end of the horizontal pivot 11 via a coupling 26a. The winding transmission for driving the primary introduction member 7 and the secondary introduction member 8 uses the horizontal pivot shaft 11 as a common drive shaft, so that this single control is used for controlling both the primary introduction member 7 and the secondary introduction member 8. The rotary encoder 26 can be used. That is, the single rotary encoder 26 can detect the movement amounts of both the primary introduction member 7 and the secondary introduction member 8. As a result of detecting the movement amounts of the primary introduction member and the secondary introduction member by the rotary encoder 26, the primary introduction member 7 and the secondary introduction member 8 are position-controlled with high accuracy by a motor 17 such as a servo motor.

  As described above, in this bar feeder, either one of the upper and lower rear guide members 4 and 5 is switched with respect to the front guide member 3. It is necessary to confirm that the material A has been normally pushed from the one rear guide member 4 to the front guide member 3, and a sensor (not shown) for the confirmation is disposed at a predetermined position. This sensor is specifically a proximity switch. When this sensor detects that the bar A has been normally pushed to the front guide member 3, the rear guide members 4 and 5 are switched from one to the other, and the secondary introduction member 8 is moved from the other rear guide member 5. It moves to the front guide member 3 and feeds the bar A to the NC lathe 2.

  As shown in FIGS. 1 to 4, a clamp device 27 is disposed at the boundary between the front guide member 3 and the rear guide members 4 and 5. The clamp device 27 performs centering of the rod A when the rod A is pushed out from the one rear guide member 4 to the front guide member 3 in the primary introduction of the rod A, and the axis of the rod A Is aligned with the extension line of the axis of the finger chuck 8a at the tip of the secondary introduction member 8, so that the finger chuck 8a can easily grip the rear end of the bar A.

  As shown in FIGS. 5 to 8, the clamp device 27 includes clamp pieces 28 a and 28 b that hold the rear end of the bar A pushed out by the front guide member 3, and a centering guide piece that performs centering of the bar A. 29a, 29b.

  The clamp pieces 28a and 28b are provided in pairs, and each is constituted by a block body. The pair of clamp pieces 28a and 28b are arranged so that the axis C of the secondary introduction member 8 when the lower rear guide member 5 is in communication with the front guide member 3 as shown in FIGS. Are opposed to each other so that they are sandwiched from the horizontal direction. The opposing surfaces of the clamp pieces 28a and 28b are roughened so that the bar A can be easily fixed.

  As shown in FIGS. 5 to 8, the clamp pieces 28a and 28b are respectively fixed on the sliders 30a and 30b. Each slider 30a, 30b is slidably held by a slide rail 31 fixed to the frame 1a so as to extend in a direction perpendicular to the axis C of the secondary introduction member 8. A pinion 32 is pivotally supported at the center of the slide rail 31, and racks 33a and 33b formed on the sliders 30a and 30b mesh with the pinion 32 from both sides. The frame 1a is provided with a cylinder / piston device 34 driven by air, and the piston rod 34a is connected to one slider 30b. When the cylinder / piston device 34 is contracted, as shown in FIG. 6, both sliders 30a, 30b slide on the slide rail 31 in directions away from each other via the racks 33a, 33b and the pinion 32, and both clamp pieces 28a, 28b separates. When the piston / cylinder device 34 is extended, both the sliders 30a and 30b slide on the slide rail 31 in a direction approaching each other via the racks 33a and 33b and the pinion 32, and both the clamp pieces 28a and 28b are bar members. Insert A so that it does not move.

  As shown in FIGS. 5 and 6, each centering guide piece 29a, 29b is provided with a V-shaped groove 35 into which the bar A can enter. Two centering guide pieces 29a and 29b having the same shape are spaced apart in the direction of the axis A of the rod A or the secondary introduction member 8 and sandwich the clamp head 36a of one clamp piece 28a in the middle. It is provided as follows. As described above, when the piston / cylinder device 34 extends and the clamp pieces 28a and 28b approach each other, the centering guide pieces 29a and 29b guide the bar A to the bottom of the V-shaped groove 35, and the bar A , The clamp heads 36a, 36b of the clamp pieces 28a, 28b clamp the bar A from both sides. Thus, since the bar A is supported by the centering guide pieces 29a and 29b at a plurality of locations in the axial direction, deformation such as bending occurs even if the bar A is thin, for example, about 1 mmφ or smaller. It is centered properly without any problems.

  Further, both centering guide pieces 29a and 29b are brought into a non-pressurized state when the centering of the bar A is completed and the clamp pieces 28a and 28b clamp the bar A, or lightly contact with or separate from the bar A. It is provided as follows. For this reason, as described above, the rod A is centered and operated at a plurality of locations in the axial direction, and even if the rod A is thin, the rod A is straight and does not deform such as bending. Therefore, the bar A can be accurately gripped by the finger chuck 8a.

  As shown in FIGS. 5 and 7, the two centering guide pieces 29a and 29b are connected to each other by a connecting piece 29c. Specifically, the centering guide pieces 29a and 29b and the connecting piece 29c are integrally formed by bending a single plate material. The two centering guide pieces 29a and 29b are integrally positioned by connecting the connecting piece 29c to the clamp piece 28a with the position adjusting screw 37. A portion of the connecting piece 29c through which the position adjusting screw 37 passes is a long hole 38 extending in a direction intersecting the axis C of the secondary introduction member 8. As a result, the position adjusting screw 37 is loosened, and the connecting piece 29c is slid on the clamp piece 28a in the direction intersecting the axis C of the secondary introduction member 8, so that two centering points are provided according to the diameter of the bar A. The positions of the guide pieces 29a and 29b can be adjusted quickly. That is, when the diameter of the bar A is changed, the position adjusting screw 37 is loosened and the connecting piece 29c is slid on the clamp piece 28a, so that the V-shaped groove 35 of the centering guide pieces 29a and 29b and the clamp head piece 36a are relative to each other. By changing the positional relationship, the centering guide pieces 29a and 29b can be brought into a non-pressurized state with respect to the bar A simultaneously with the completion of centering.

  As shown in FIGS. 5 to 7, the clamp device 27 includes a proximity switch 39 that detects the bar A centered by the centering guide pieces 29a and 29b and clamped by the clamp pieces 28a and 28b in a non-contact manner. .

  The proximity switch 39 is fixed to the centering guide piece 29b via the bracket 40. Thereby, the position of the proximity switch 39 can be adjusted in the same manner as the position adjustment of the centering guide pieces 29a and 29b.

  Thus, since the proximity switch 39 detects the presence / absence of the bar A, even if the bar A is thin, the presence / absence of the bar A is accurately detected. It can be prevented from driving. Further, since the proximity switch 39 is not in contact with the bar A, the deformation accompanying the detection of the bar A can be prevented.

  As shown in FIG. 9, the proximity switch 39 can be attached to the other clamp piece 28b.

  Next, the operation of the bar feeder having the above configuration will be described.

(1) The upper and lower rear guide members 4 and 5 of the bar feeder 1 are initially in the positions shown in FIGS. 10A and 3, and the lower rear guide member 5 communicates with the front guide member 3. Yes. In this state, the groove of the lower rear guide member 5 and the groove of the front guide member 3 are linearly connected.

(2) As shown in FIGS. 10 (B) and 4 (A), the cylinder / piston device of the connection switching means 6 is contracted, and the upper and lower rear guide members 4 and 5 are moved downward with the horizontal pivot 11 as a fulcrum. Turn to a small angle. Thereby, the upper rear guide member 4 communicates with the front guide member 3.

(3) As shown in FIG. 10 (C), FIG. 4 (A) and FIG. 4 (B), a new material which is one bar A from the bar supply shelf (not shown) 4 and falls into the groove of the front guide member 3 and the groove of the rear guide member 4 on the upper stage.

(4) As shown in FIG. 10D, when the motor 17 rotates forward and the primary introduction clutch 19 is turned on, the endless timing belt 14 travels, and the primary introduction member 7 is the upper rear guide member. 4 Slide forward on top. As a result, the bar A loaded so as to straddle the front guide member 3 and the upper rear guide member 4 in the above (3) is pushed out onto the front guide member 3, and the entire bar A is in the upper stage. It moves from the rear guide member 4 onto the front guide member 3. As a result, the rear end of the bar A falls from the upper rear guide member 4 to the front guide member 3, and the completion of primary introduction is detected by a sensor (not shown). The amount by which the rod A is pushed out by the primary introduction member 7 is controlled by detecting the amount of movement of the primary introduction member 7 by the rotary encoder 26.

  When the completion of the primary introduction is detected, the cylinder / piston device 34 of the clamp device 27 shown in FIGS. 5 and 6 is operated, and the pair of clamp pieces 28a and 28b are sandwiched from both sides toward the rear end of the bar A. To advance. At the same time, the two centering guide pieces 29 a and 29 b that are separated from each other in the axial direction of the bar A also advance toward the rear end of the bar A, and the bar A is moved by the V-shaped groove 35. Center. The rear end of the bar A is clamped by the clamp pieces 28a and 28b simultaneously with the centering, and at the same time is released from the pressing by the centering guide pieces 29a and 29b. Thereby, even if the bar A is very thin, it is set on the extension line of the shaft core C of the secondary introduction member 8 without causing deformation such as bending.

(5) When the presence of the bar A and the completion of the primary introduction are detected, as shown in FIGS. 10 (E) and 3, the cylinder / piston device as the connection switching means 6 extends, The rear guide members 4 and 5 are rotated upward with the horizontal pivot 11 as a fulcrum. As a result, the upper rear guide member 4 is disconnected from the front guide member 3, and the lower rear guide member 5 communicates with the front guide member 3 in a straight line.

  Thereafter, the motor 17 rotates in the reverse direction and the primary introduction clutch 19 is turned on, whereby the endless timing belt 14 travels in the reverse direction, and the primary introduction member 7 slides backward on the upper rear guide member 4 to return to the original position. Return to.

  Further, when the motor 17 rotates forward and the secondary introduction clutch 24 is turned on, the endless timing belt 20 travels, and the secondary introduction member 8 projects from above the lower rear guide member 5. Since the bar A clamped by the clamp device 27 is in a centered state in front of the secondary introduction member 8, the rear of the bar A is inserted into the finger chuck 8a at the tip of the secondary introduction member 8 moving forward. The edge fits.

  Thereafter, the cylinder / piston device 34 of the clamp device 27 is reversely operated, and the pair of clamp pieces 28a, 28b separate from the rear end of the bar A and release the bar A.

(6) As shown in FIG. 10F, the motor 17 continues to rotate normally, the endless timing belt 20 travels, and the secondary introduction member 8 moves from the lower rear guide member 5 to the front guide member 3. Slide forward. As a result, the bar A pushed out onto the front guide member 3 in the above (4) is pushed from the rear by the secondary introduction member 8 while being gripped by the finger chuck 8a, and the top guide member 3 is moved over the front guide member 3. Slide towards NC lathe 2. The feed amount of the bar A by the secondary introduction member 8 is detected through detection of the movement amount of the secondary introduction member 8 by the rotary encoder 26.

(7) When one bar A is consumed, the motor 17 rotates in reverse and the secondary introduction clutch 24 is turned on, whereby the endless timing belt 20 travels in reverse and the secondary introduction member 8 The front guide member 3 and the lower rear guide member 5 are slid rearward to return to the original positions in the lower rear guide member 5. Thereafter, the bar feeder 1 continues the processing of the bar A by repeating the operations (1) to (7) shown in FIGS. 10 (A) to 10 (F).

  The present invention is not limited to the above embodiment. For example, the centering guide piece is disposed only on one clamp piece side in the above embodiment, but may be provided on the other clamp piece side. , And may be provided on both clamp pieces. In addition, the clamp piece and the centering guide piece are advanced and retracted in the horizontal direction, but can be advanced and retracted in the vertical direction. Further, the driving of the clamping device is not limited to the cylinder / piston device, but can be driven by other means such as a cam device.

It is a front view of the bar feeder provided with the clamp device concerning the present invention. It is a top view inside the bar feeder shown in FIG. It is a front view inside the bar feeder shown in FIG. (A) is a front view of the inside of a bar feeder at the time of new material supply, (B) is a front view which shows the state of the new material in a bar feeder. It is a top view of the V section in FIG. In FIG. 2, it is a VI-VI direction arrow directional view. In FIG. 2, it is a VII-VII direction arrow directional view. In FIG. 2, it is a VIII-VIII line arrow directional view. It is a figure which shows the other example of installation of a proximity switch, (A) is a top view, (B) is a front view. It is operation | movement explanatory drawing of the bar supply machine provided with the clamp apparatus which concerns on this invention.

Explanation of symbols

A ... Bar material 1 ... Bar material feeder 8a ... Finger chuck 27 ... Clamping device 28a, 28b ... Clamp piece 29a, 29b ... Centering guide piece 39 ... Proximity switch

Claims (3)

  In a clamp device of a bar feeder that includes a clamp piece for gripping a bar and a centering guide piece for centering the bar, a plurality of centering guide pieces are arranged at predetermined intervals in the axial direction of the bar. The clamp of the bar feeder, wherein the centering guide piece is provided so that the bar is not pressurized when the centering of the bar is completed and the clamp piece clamps the bar. apparatus.   2. The clamp apparatus for a bar feeder according to claim 1, wherein the plurality of centering guide pieces are connected to each other.   3. The bar apparatus according to claim 1, further comprising a proximity switch that detects the bar centered by the plurality of centering guide pieces in a non-contact manner. Clamp device for feeding machine.

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